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Chadha, Ankit. "Tapped-Inductor Buck DC-DC Converter." Wright State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1578488939749599.
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DI, LORENZO ROBERTO. "DC-DC Buck Converter For Automotive Applications." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2021. http://hdl.handle.net/10281/301996.
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L'avvento del MOSFET di potenza è uno degli sviluppi più significativi nell'elettronica di potenza negli ultimi anni. Mentre i dispositivi verticali apparsi alla fine degli anni settanta sembravano destinati a trovare un posto importante nel mercato, in particolare nell'area della conversione di potenza ad alta frequenza, il predominio generale del transistor bipolare di potenza non sembrava seriamente minacciato. Tuttavia, quando i dispositivi DMOS verticali più facilmente fabbricabili apparvero in volume nel 1978, la scena era pronta per una rivoluzione. Il MOSFET di potenza ha rapidamente raggiunto la reputazione di essere tollerante e facile da progettare, ma l'accettazione universale è stata ritardata dal suo costo relativamente alto.
L'elettronica automobilistica che funziona dalla batteria dell'auto subisce tensioni transitorie come l'avviamento a freddo e lo scarico del carico che possono variare da 4,5 V a> 30 V. Inoltre, le nuove tecnologie come start-stop aumentano la frequenza di tali transitori e i requisiti operativi dei dispositivi elettronici. Ciò richiede circuiti integrati di alimentazione o batteria per resistere a condizioni operative difficili e fornire alimentazione affidabile all'intero veicolo. Ad esempio, l'aria condizionata, le luci anteriori / posteriori dell'auto dovrebbero mantenere la loro funzionalità durante le condizioni di avviamento indotte da start-stop. Questo requisito può essere soddisfatto in modo efficiente e affidabile dai convertitori DC-DC.
L'industria automobilistica sta rapidamente passando dalle lampade a filamento ai nuovi sistemi (LED) per l'illuminazione anteriore / posteriore in quanto offrono prestazioni migliori in termini di efficienza energetica rispetto a quelli convenzionali. Tuttavia, a causa delle caratteristiche elettriche di questi sistemi presenti in un'auto non può essere alimentato direttamente dalla batteria dell'auto. Richiedono circuiti di pilotaggio specializzati in grado di rispondere alle mutevoli esigenze dei carichi al variare delle loro proprietà elettriche mantenendo la corrente uniforme. I convertitori DC-DC sono il modo più semplice per alimentare tale carico con una corrente costante. Di conseguenza, i convertitori Buck, Boost e Buck-Boost DC-DC per applicazioni automobilistiche sono di grande interesse per l'industria automobilistica. In particolare, non affrontato
finora sono soluzioni monolitiche nelle tecnologie Smart Power. Le tecnologie Smart Power consentono di integrare transistor di potenza, logica di controllo e diagnostica su un unico chip (SOC - System On Chip). Poiché i requisiti di resa elevata implicano solo fasi di lavorazione altamente mature e con esperienza. A causa dei requisiti di basso costo, viene utilizzata una sequenza di maschere ridotta, che porta normalmente a due livelli di interconnessione (polisilicio e metallo). In questa tesi è stato progettato un convertitore DC-DC per applicazioni automotive. Il primo capitolo di questo documento ha lo scopo di servire da introduzione al lettore per tutte le descrizioni del lavoro insieme al rapporto. Abbiamo bisogno di una tecnologia ad alta tensione per progettare un convertitore DC-DC integrato. Qui, userò la tecnologia smart power, questa tecnologia permette di creare interruttori di potenza high side con bassa resistenza.<br>The advent of the power MOSFET ranks as one of the most significant developments in power electronics in recent years. While the vertical devices which appeared in the late seventies looked set to find an important place in the market, particularly in the area of high-frequency power conversion, the overall dominance of the power bipolar transistor did not seem seriously threatened. However, when the more easily manufacturable vertical DMOS devices appeared in volume in 1978, the scene was set for a revolution. The power MOSFET rapidly achieved a reputation for being forgiving and easy to design with, but universal acceptance was delayed by its relatively high cost.
The automotive electronics operating from car battery experiences transient voltages such as cold-cranking and load dump which can range from 4.5V to >30V. In addition, the new technologies such as start-stop, increase the frequency of such transients and operational requirements of electronic devices. This requires o-battery power ICs to withstand harsh operating conditions and reliably provide power to the whole vehicle. As an example, the air condition, front/back car lights are supposed to keep their functionality during start-stop induced cranking conditions. This requirement can be efficiently and reliably fulfilled from DC-DC converters.
The automotive industry is rapidly switching from filament lamps to new systems (LED) for front/back lighting as they perform better in terms of energy efficiency than the conventional ones. However, due to the electrical characteristics of these systems present in a car cannot be powered directly from the automotive battery. They require specialized driving circuits which can respond to the changing needs of the loads as their electrical properties change while maintaining the uniform current. DC-DC converters other the easiest way to power such the load with a constant current. As result Buck, Boost, Buck-Boost DC-DC converters for automotive applications are of great interest for the automotive industry. In particular, not addressed
so far are monolithic solutions in Smart Power technologies. Smart Power technologies allow integrating power transistor, control logic and diagnostic on a single chip (SOC – System On Chip). Because high yield requirements they involve only highly mature, well-experienced processing steps. Because of low-cost requirements, a reduced mask sequence is used, leading normally to two interconnecting levels (polysilicon and metal). In this thesis, it has been designed a DC-DC converter for automotive applications. The first chapter of this document is aimed to serve as an introduction to the reader for all the work descriptions along with the report. We need a high voltage technology to design an integrated DC-DC converter. Here, I will use smart power technology, this technology permits to create high side power switch with low resistance.
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Querol, Borràs Jorge. "MCU Controlled DC-DC Buck/Boost Converter for Supercapacitors." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-101205.
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This work is focused on DC to DC conversion, what is a crucial function to enable the use of supercapacitors for energy storage. A theoretical study and comparison of methods, algorithms and techniques for software controlled DC-DC converters have been used to develop a system what can step up or down a DC variable voltage and transform it into a steady state voltage. As a result a new control theory based on Bang-Bang control has been developed with an ARM LPC1768 processor. It was implemented to solve the commercial converters problems because they cannot work with supercapacitors due to their low internal resistance. The outcome is a device what can provide a programmable voltage between 4.5 V and 25 V, hardware can support up to 6 A and it is able to control the operating current owing through the converter. It can be used with the supercapacitors as shown in this work but it can also be used as a general platform for voltage and energy conversion. Furthermore, the designed hardware has the potential to work with smart grids via Ethernet connector, solar panels with MPPT algorithms and, at last, manage energy between dierent kinds of DC voltage sources and devices.<br>Detta arbete är inriktat på DC till DC konvertering, vad är en viktig funktion för att möjliggöra användningen av superkondensatorer för lagring av energi. En teoretisk studie och jämförelse av metoder, algoritmer och tekniker för program styrs DC-DC omvandlare har använts för att utveckla ett system vad som kan stega upp eller ner en DC variabel spänning och omvandla det till ett stabilt tillstånd spänning. Som ett resultat av en ny kontroll teori bygger på Bang-Bang kontroll har utvecklats med en ARM LPC1768 processor. Det genomfördes för att lösa de kommersiella omformare problemen eftersom de inte kan arbeta med superkondensatorer på grund av deras låga inre motstånd. Resultatet är en anordning vilken kan tillhandahålla en programmerbar spänning mellan 4,5 V och 25 V, kan hårdvaran att stödja upp till 6 A och det är möjligt att styra operativsystemet ström som flyter genom omvandlaren. Den kan användas med de superkondensatorer, såsom visas i detta arbete, men den kan också användas som en allmän plattform för spänning och energiomvandling. Dessutom har hårdvara möjlighet att arbeta med smarta nät via ethernet-uttag, solpaneler med MPPT algoritmer och äntligen, hantera energi mellan olika typer av DC spänningskällor och enheter.
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Al, Kzair Christian. "SiC MOSFET function in DC-DC converter." Thesis, Uppsala universitet, Elektricitetslära, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-415147.
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This thesis evaluate the state of art ROHM SCT3080KR silicon carbide mosfet in a synchronous buck converter. The converter was using the ROHM P02SCT3040KR-EVK-001 evaluation board for driving the mosfets in a half bridge configuration. Evaluation of efficiency, waveforms, temperature and a theoretical comparison between a silicon mosfet (STW12N120K5) is done. For the efficiency test the converter operate at 200 V input voltage and 100 V output voltage at output currents of 7 A to 12 A, this operation was tested at switching frequencies of 50 kHz, 80 kHz and 100 kHz. The result of the efficiency test showed an efficiency of 98-97 % for 50 kHz, 97.7-96.4 % for 80 kHz and 97-96.2 % for the 100 kHz test. The temperature test shows a small difference in comparison of the best case scenario and the worst case scenario, temperature ranges from 25.5 to 33.5 °C for the high side mosfet while the low side mosfet temperature ranges from 29.8 to 35 °C. The waveform test was conducted at 50 kHz and 100 kHz for output currents of 4 A and 12 A (at 200 V input and 100 V output). The result of the waveform test shows a rise and fall time of the voltages in range of 10-12 ns while the current rise and fall time was 16 ns for the 4 A test and 20 ns for the 12 A test. Overall SiC mosfet show a clear advantage over silicon mosfet in terms of efficiency and high power capabilities.
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Lau, Wai Keung. "Current-mode DC-DC buck converter with dynamic zero compensation /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?ECED%202006%20LAU.
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Mobaraz, Hiwa. "Modelling and Design of Digital DC-DC Converters." Thesis, Linköpings universitet, Institutionen för systemteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-127713.
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Digital Switched mode power supplies are nowadays popular enough to be the obvious choice in many applications. Among all set-up and control techniques, the current mode DC-DC converter is often considered when performance and stability are of interest. This has also motivated all the “on chip” and ASIC implementations seen on the market, where current mode control technique is used. However, the development of FPGAs has created an important alternative to ASICs and DSPs. The flexibility and integration possibility is two important advantages among others. In this thesis report, an FPGA-based current mode buck/boost DC-DC converter is built in a stepwise manner, starting from the mathematical model. The goal is a simulation model which creates a basis for discussion about the advantages and disadvantages of current mode DC-DC converters, implemented in FPGAs.
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Mai, Yuan Yen. "Current-mode DC-DC buck converter with current-voltage feedforward control /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?ECED%202006%20MAI.
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BOERA, FILIPPO. "High Frequency DC-DC Buck Converter for Automotive Post-Regulated Applications." Doctoral thesis, Università degli studi di Pavia, 2022. http://hdl.handle.net/11571/1452159.
Texte intégralRésumé :
The current trends in the automotive market are pushing toward an ever increasing integration of electronic components in a car. Modern cars need to be safer and smarter, hence there is the need of a lot of sensors, radars, microcontrollers etc. Consequentially, the power supply circuits that are needed to power up all these devices starting from the 12-V battery of a car are also facing an intense thrust to integration. More integration of the power supply circuits means that the production costs and area of the components are significantly reduced, but leads to less flexibility of the circuits and less robustness to high temperatures. The traditional approach was to directly convert the battery voltage to each desired lower voltage using either low dropout regulators(LDOs) or switching DC-DC converters, depending on the application. Nowadays a post-regulated approach is preferred: one converter downshifts the battery voltage to an intermediate one, typically in the range of 4∼8 V, and that intermediate voltage can either directly supply some circuits, or be the input of multiple successive regulators, that will each power up the circuits that require lower supply voltages. While complicating the design, this approach is preferred due to a higher efficiency, and the possibility of a more robust thermal isolation of the circuits. Switching DC-DC converters are usually very expensive and bulky, and this is mostly due to the presence of the inductor, which can often cost more than the chip itself, both in terms of money and area consumption. The typical switching frequency of a DC-DC converter is a few MHz. By increasing the switching frequency, a much lower inductance value can be used without degrading the current ripple. Having a lower value of inductance means that the physical dimension of the inductor is smaller, resulting in an advantage in chip cost and area. In the field of power converters, efficiency is obviously another key parameter, especially in the field of automotive where a high efficiency is beneficial for both environmental and economical reasons. The main topic of this PhD research is the study and of this research is the study and the design of a buck converter with specifications aligned with the post-regulated domain, switching at 50/100 MHz. This work has been possible thanks to the collaboration between the University of Pavia and Infineon Technologies Italy, with help from both the Pavia and Padova sites.
The second topic of this thesis is the design of a Hybrid Single-Inductor Bipolar-Output DC–DC Converter with Floating Negative Output for AMOLED Displays. As AMOLED Displays have become one of the standard technologies for mobile and TV screens, the research for more compact and efficient solutions for the supplies of the pixels is thriving. As AMOLED displays need two supply voltages (one positive and one negative) to turn on, two separate DC-DC converters are typically used to provide the necessary voltages from the battery. A Single-Inductor solution can generate both voltages with only one inductor, hence saving a lot of money and area on the chip. This part of the work has been conducted thanks to the collaboration between the University of Pavia and the University of Macau.
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Siu, Man. "Design of voltage-mode buck converter with end-point prediction /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202004%20SIU.
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Sikora, Roman. "DC-DC měnič pro matrix beam modul." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413161.
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The master thesis deals with the development of buck-boost DC-DC converter which supplies matrix beam module. The design is focused on testing two-phase boost converter and three channel buck converter manufactured by NXP Semiconductors. Part of the design is implementation of microcontroller for converter control and communication with computer. Part of the thesis is also to design user interface on Windows platform for easy system configuration. Next thing the thesis deals with is designing load for DC-DC converter that is variable and can make different current consumption. One part of this thesis is focused to achieve the lowest conducted emissions and to maximize conducted immunity. Part of this project is production of a prototype and prototype testing.
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Huang, Chien-Chung, and 黃建中. "BIPOLAR SYNCHRONOUS DC-DC BUCK CONVERTER DESIGN." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/97013166298125170114.
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碩士<br>大同大學<br>電機工程學系(所)<br>97<br>A DC-DC synchronous buck converter with soft start has been designed and simulated with 40V bipolar process. The overall circuit is designed based on a voltage-mode PWM controlled converter. The input voltage range is from +4.3V to +20V. Simulation results show that this converter with on-chip current sensor can operate at 200 kHz. The current limit is implemented by sensing the voltage drop across the bottom N-MOSFET RDS (ON). The soft start function is used to prevent large inrush currents upon power-up. The internal thermal protection circuit can protect the system when the temperatures exceed 150°C.
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Liao, Hsiao-Yun, and 廖筱耘. "A Digital-Intensive DC-DC Buck Converter." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/32051473247626262572.
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碩士<br>國立暨南國際大學<br>電機工程學系<br>102<br>In recent years, integrated circuit process technology improved, circuit density increases, and circuit function powerful. The improving of process technology decreases the operation voltage of circuit. Meanwhile, the portable electronic products are popular today. So, low power consumption and high power efficiency are the primary consideration when designing portable electronic products. To increase the endurance of these portable electronic products, these circuits must operate in a low voltage and low current to reduce the power consumption.
In this paper, a full-digital bulk converter controller is proposed. First, using VCO as a comparison circuit. The result of this circuit will not be affected by temperature or process. It is worth to mention that PWS circuit can meet the requirement under the different voltage.
Based on the proposed architecture and techniques, an output voltage range between 0.9v~1.8v, load current range between 100mA~500mA digital control bulk converter circuit is realized. In TSMC 0.18-μm 1P6M CMOS process, simulation results show that the circuit in the load current of 100 mA the efficiency up to 86.3% ~ 88.76%, the load current of 500 mA the efficiency up to 91.5% ~ 94.5%.
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O, Enkhtuya, and 歐安塔. "Design of Buck-Boost DC-DC converters." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/f3y52u.
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碩士<br>國立勤益科技大學<br>電子工程系<br>105<br>DC-DC conversion would provide the correct power to the system needed. Many different varieties of voltage regulators with a variety of control schemes are used. DC-DC converters are some of the most widely used power electronics circuits for its conversion efficiency and flexible output voltage. In this thesis 3 common topologies that makes useful are the Buck, Boost, and the Buck Boost converters.
These converters used for electronic devices are designed to regulate the output voltage against the changes of the input voltage and load current. The first converter is a buck converter which steps a voltage down. The producing voltages would be lower than the input voltage. The next converter is a boost converter that steps a voltage up producing a voltage higher than the input voltage. A buck boost converter step a voltage up or down, producing a voltage equal to or higher or lower than the input voltage. The performance has been proved by the Multisim software. The performance simulation mainly focuses on analysis of different DC-DC converters. Each converter has its own peak-to-peak inductor ripple current, peak-to-peak capacitor, inductor, on switch of different converters, all of which are expressed mathematically.
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Chan, Yan Shuo, and 詹彥碩. "Buck Dc-to-Dc Converter Design and Analysis." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/23392021489825330516.
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碩士<br>國立中正大學<br>機械系<br>92<br>Today, most industrial and homely load application
are all dealing with the electric energy in power
electronic systems and controling the flow of power
to load.In the progress of technology, Microelectronics
and Power Semiconductor technology are continuously
improving in recent year. Power electronic systems design
face to reduce size, cost, and enhanceperformance as
optimum objective. Therefore the power electronic systems development have been respected progressively.
DC motors have high start torque, linearly control achievement and high speed response. Therefore, most
industrial load drives are use DC motors as actuator.
To enhance the systems transmission efficiency, and
reduce unnecessary energy loss, the power electronics converters design are very important. The main purpose
of this thesis aim at the design and analysis of the
normal rated power 450 Watt DC motor on buck dc-to-dc converter. First, we analyze buck dc-to-dc converter
principle, and ideal whole converter designsituation.
Next, we employ a circuit simulation software PSPICE
to design converter and select the circuit element.
Based on the simulation design converter, we practically
make buck dc-to-dc converter and study the difference
between practical design result in non-ideal condition
and theoretical design result in ideal condition.
Simultaneously, we improve practical design produced
non-ideal condition.
Finally, the thesis focus on the difference between
practical design circuit and theoretical design circuit,
and adjust the circuit element range to reach the feasible
of practical circuit application and improve the converter
non-ideal condition.
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Hsiao, Chi-Lung, and 蕭吉隆. "Design of Digital DC-DC Switching Buck Controller." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/30286803415906124205.
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碩士<br>國立交通大學<br>電機學院IC設計產業專班<br>96<br>In recent years, due to development of frivolous and small portable electronic products quickly, except use of the battery, a fixed-voltage and low-ripple voltage regulator in the power circuit design has already been the essential tendency. For a traditional analog voltage regulator, when the power circuit specification has been changed, it needs to redesign according to new parameters. For a digital voltage regulator, it is realized by the digital control modulation technique to promote the performance of the system circuit. This technique makes use of the proportion integral differential (PID) compensator as the basic foundation of system design.To obtain transformation of high-efficiency DC voltages, this thesis proposes a novel digital DC-DC switching buck controller. The controller output voltage is transferred to feedback signals via an analog to digital converter (ADC), and then the difference between the feedback signal and the reference voltage is regarded as a major modulation signal.
In this thesis, design of the digital controller is implemented and verified by using the filed programmable gate array (FPGA). We demonstrate a system circuit which uses the penetration voltage drop called the buck voltage converter in order to verify the digital controller. The input voltage of the controller has wider ranges volts, and the output is fixed as 3.3 volts. Finally, the proposed design can achieve the maximum output load current of 1A and the power transformation rate of 85.7%.
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Tsao, Jiun-Hau, and 曹浚豪. "HIGH FREQUENCY SYNCHRONOUS BUCK BOOST DC-DC CONVERTER." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/88723223904880136792.
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碩士<br>大同大學<br>電機工程學系(所)<br>100<br>In this thesis, we propose a non-inverting topology for buck-boost converter to extend the battery life of a portable device. Four power MOSFETS switches are used to improve the efficiency, and increase the operation frequency to 1MHz to minimize the inductance. The compensated error amplifier is composed of two blocks, unity-gain zero generation block and gain block, realizing phase shift and gain of the feedback loop, respectively. Therefore, it can reduce the capacitor value for circuit integration.
The simulation results show that this buck-boost converter can operate in 1MHz with supply voltage from 4.7V to 2.8V, which is suitable for single-cell lithium-ion battery supply applications. The output voltage regulated in 3.3V with a 10uF off-chip capacitor and 3.3uH off-chip inductor. The power efficiency is over 90% for load current from 50mA to 400mA. The quiescent power dissipation is 3mW.
The DC-DC converter has been fabricated with a TSMC 0.35um 2p4m 3.3V/5V Mixed Signal CMOS process provided by National Chip Implementation Center(CIC).
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Yang, Chih-Wei, and 楊智偉. "Terminal Sliding Mode Control of DC-DC Buck Converter." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/40287493094885340856.
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碩士<br>中原大學<br>電機工程研究所<br>97<br>Sliding mode control is widely used in recent years to deal with the control problems of nonlinear systems. In this dissertation we applied terminal sliding mode control (TSMC) which is different from traditional sliding mode control on DC - DC buck converter design. It not only retains the advantages of sliding mode control but also includes terminal convergence characteristics. Furthermore, the system stability is discussed using Lyapunov function analysis. When considering the actual derivation error uncertainty in passive components, the controller is proceeded by adding an adaptive machine into adaptive terminal sliding mode control (ATSMC). As a result, the system uncertainty is allowed, i.e. the controller provides high robustness. In addition, Barbalat's lemma is also applied for stability analysis.
To verify the control performances, we first perform simulations in the output voltage control when the load and input source are uncertain, i.e., the load changes and input changes. Next, the DC-DC Buck converter control is implemented. The adaptive terminal sliding mode controller is realized using dSPACE 1104 and Simulink toolbox. Experiment results show satisfactory performance even under load and the input voltage variations.
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Hsieh, Meng Ting, and 謝孟廷. "All Digital Controlled High Accuracy Buck DC-DC Converter." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/65275255834234271315.
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碩士<br>長庚大學<br>電機工程學系<br>100<br>This paper presents a fully digital control of DC-DC buck converter circuit. According to the relative relationship between the output voltage and reference voltage, the circuit will control power MOS’s duty cycle by means of DPWM’s signal to achieve the correct voltage. The buck converter has some advantages of high accuracy, low area, and high efficiency. This circuit is achieved by simulation and chip and then compare the results.
This all-digital controller buck DC-DC converter is implemented in Taiwan Semiconductor Manufacturing Company (TSMC) 0.35μm CMOS process. Operated from a 3.3±10%V supply voltage, DPWM resolution is 8-bit and power MOS switch’s frequency is 1MHz. The output voltage range is from 0.6V to 3V and the maximum output load current is 400mA . The output voltage accuracy is more than 99% and maximum conversion efficiency is 92.1%. The fully-integrated chip area is 0.972 mm*0.972 mm and the core area is 0.49 mm2.
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Yu-Hui, Sung, and 宋玉惠. "Implementation of 8MHz Current-Mode Buck DC-DC Converter." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/17297645957351678156.
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碩士<br>國立交通大學<br>電機學院IC設計產業專班<br>95<br>This thesis proposes a new DC-DC switching converter with a high switching frequency for reducing the size of the output filter. Owing to the high switching frequency, the on-chip output filter in DC-DC switching converter is possible in the future. Thus, how to develop a DC-DC switching converter with high switching frequency is important in today’s technology. Therefore, a compact solution is needed to effectively reduce the footprint area of the power management module in system-on-chip (SoC) systems. Furthermore, a high performance power converter module is also needed to provide a regulated and stable supply voltage to the SoC systems because the operation voltage of the SoC systems is too low to have a good signal-to-noise ratio. For providing a high performance supply voltage, the current-mode technique is utilized to get better line and load regulations. However, the current sensing accuracy and response time is seriously affected by the high switching frequency. A high accuracy and small response time current sensor is also proposed in this thesis.
In thesis, we implement an 8 MHz current-mode buck DC-DC converter with good line and load regulations. The chip is implemented by tsmc 2P4M 0.35u CMOS process. The range of the operation voltage is from 2.6V to 3.3V. The load regulation and line regulation are 0.88uV/mA and 4.67mV/V. The chip features smaller output filter elements and fast response, which makes it suitable for power management in the portable devices.
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Lou, Chen-Chien, and 樓志堅. "Robust Performance Analysis for Multimodule Parallel DC-DC Buck." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/86531460554472984920.
Texte intégralRésumé :
碩士<br>國立臺北科技大學<br>機電整合研究所<br>92<br>The objective of this thesis is to use the structured singular value in robust control theory to analyze the performance indices of multimodule DC-DC buck converters system. First, we adopt the energy conservation theorem to derive practical performance specifications used in power electronics, such as ripple, efficiency and output voltage level. Since the component values in modules of parallel system are usually different and then deteriorate the performance, according to the cases: (1) characteristics in each module are identical, (2) characteristics in each module are different, mathematical models are established respectively. By using the models, linear fractional transform techniques are employed to conduct the LFT models of performance indices. As a result, the allowable variation range of the circuit components in parallel converters can be found to retain the pre-specified performance requirement.
Also, the current distribution in each module of parallel converters is one of the most concerned problems. To analyze the problem, the current distribution error is defined as a performance index in this thesis. This performance index represents the current difference of modules in steady state, and it is the smaller the better. Using similar linear fractional transform techniques, the model of current distribution error is built and the tolerant arrange of component values is found for the given distribution error specification.
From computer simulations, it is shown that the variation ranges of the circuit component are found by the proposed method for keeping the robustness of performance indices.
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Lee, Jia-Jyun, and 李家鈞. "On-Chip Compensation Techniques for DC-DC Buck Converters." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/34622714986258029243.
Texte intégralRésumé :
碩士<br>國立交通大學<br>電機學院電機與控制學程<br>102<br>This work is discussing the comprehensive concepts of on-chip compensation (OCC) techniques for DC-DC buck converters with voltage mode control and current mode control. In general, the compensator network of DC-DC buck converter needs the external components for the large value capacitors to place the zeros in desired location to stabilize the system. Thus, the compensation of the regular DC-DC converter is completed by an off-chip compensator.
Regarding DC-DC buck converter with voltage mode control, Type III compensator is usually employed to extend the loop gain crossover frequency for better transient response. Type III compensation is often implemented by a single active element such as an OPA or OTA with off-chip large capacitors and resistors, and its insight of compensation provides the fertile background to develop the counterpart PID OCC. The integrated PID OCC takes four OTAs for the creations of two zeros to compensate the double poles from buck converter with voltage mode control. The simulation results show that the performance of PID OCC is comparable to that of Type III off-chip compensation.
As to DC-DC buck converter with current mode control, the advantage is that PI compensator is sufficient to manage the stability issue. The simplicity is obvious from the compensation point of view. However, the large capacitor required for PI compensator remains the problem to its integration on chip. Current mode Miller (CMM) OCC and time mode Miller (TMM) OCC is therefore introduced, analysed, implemented and simulated. CMM OCC by definition utilizes current to charge and discharge the small on-chip capacitor achieving the Miller effect for the large equivalent capacitance. On the other hand, TMM OCC makes use of sampling and hold to integrate the error information within very short period of time, and thus the capacitance amplification of the small on-chip capacitor is obtained. According to simulation results, the performance of CMM OCC and TMM OCC is compatible with current mode control buck converter.
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Cao, De-Wei, and 曹德偉. "Robust switching rule design for DC-DC buck converters." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/32342236339731900339.
Texte intégralRésumé :
碩士<br>國立臺灣海洋大學<br>電機工程學系<br>103<br>For control of switched-mode power supplies, most of the approaches are using the state-space averaging method to obtain averaging models of the considered circuits and then designing feedback controllers based on the averaging models. In this thesis, by a different approach, a DC-DC buck converter is modeled as a switched system, and then a robust switching rule is designed to robustly stabilize the switched systems under possible parameter variations. By simulations and practical experiments it is shown that the obtained switching law is able to stabilize the DC-DC buck converter under possible resistance, capacitance, input voltage, and load variations.
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Chou, Di-Chi, and 周帝吉. "Single-Inductor Dual-Output DC-DC Buck/Boost Converter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/01129641559018482846.
Texte intégralRésumé :
碩士<br>國立臺灣大學<br>電子工程學研究所<br>104<br>A Single-Inductor Dual-Output (SIDO) DC to DC Buck/Boost Converter topology is proposed. The power stage switching sequence is different from conventional type. In addition to three switches, a freewheel switch is used to prevent negative inductor current occurring and degrading the power efficiency. The converter uses ripple-based control method, which facilitates high switching frequency and decreasing the passive components volume.
The chip is fabricated in 0.18 μm CMOS, the proposed SIDO DC-DC Buck/Boost Converter can produce 0.95 V buck voltage with 1.4 V boost voltage. The power transfer efficiency could reach 80% in simulation.
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Chen, Lien-Chieh, and 陳聯傑. "H∞ Control Design of PWM Buck DC-DC Converter." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/00619762453291005055.
Texte intégralRésumé :
碩士<br>國立成功大學<br>系統及船舶機電工程學系碩博士班<br>93<br>Abstract
An H∞-Control design of the Pulse Width Modulator (PWM) switch buck DC-DC converter is studied in this thesis. The AC small-signal mathematical model for the PWM switch buck DC-DC converter is derived in this research and the state space equation of a topological circuit through a DC perturbation operating point is then established and linearized around the operating point. The composite model to be controlled is then composed of a AC small-signal model , a PWM transfer function and a switch transfer function. To minimize the ill-effects of the noises , disturbances and the parameter variations , the H∞-control methodolody is applied on the composite model to achieve the desired performance. Finally , computer simulations results are made to verify the feasibility and the robustness of the proposed control design under the presence of system parameter uncertainties and noises.
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Chueh, Yung-Fa, and 闕永發. "Beat Frequency Influence Analysis for DC-DC Buck Converters." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/rdq7x9.
Texte intégralRésumé :
碩士<br>國立臺灣科技大學<br>電子工程系<br>105<br>In this thesis, the effect of beat frequency on DC-DC buck converters is discussed by using Simplis simulation software. This study covers the effect of the beat frequency on the single-phase voltage mode and peak current mode and the two-phase dual-loop control mode. The advantages and disadvantages of these two control modes and how these two control modes deal with the loading with beat frequency are also covered.
In the simulation, the behaviors of output voltage and current under beat frequency is discussed. In the simulation with the two-phase the DC buck converter, why the amplitude of the inductor current is much bigger than the output voltage’s under beat frequency is discussed. The discussion also explains why the behaviors under beat frequency condition are different among the voltage mode、peak current mode single phase buck converters and two phase dual-loop buck converters.
In the end of this thesis, some solutions are discussed. The proposed solution and the future research objectives are also disclosed.
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YANG, SHANG-TA, and 楊尚達. "DC-DC Buck Converter with Constant On-Time Control." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/536978.
Texte intégralRésumé :
碩士<br>國立臺北科技大學<br>電機工程系電力電子產業碩士專班<br>107<br>This thesis mainly implements a constant on-time controlled buck converter, which uses FPGA controller to regulate the output voltage, and works in a setting frequency range. One of the advantages of the constant on-time control method is that when the load transient, it can quickly respond to rising output voltage to avoid the voltage drop too deep. The MLCC can be used on the output terminal with this method, and keep the output voltage stable, has better efficiency even in the light load.
The specification of the implemented constant on-time buck converter developed in this thesis includes output power 90 W, input voltage 6 V, output voltage 1.8 V, and single-phase switching frequency 1~2 MHz. The load varying from 10% to 100% of the actual switching control and load change from 10% to 50% are mwasured. Experimental results show that the output voltage can be regulated well despite of load changes and the transient magnitude of the output voltage response, in PI control is less than 5%, in hybrid PI control is less then 3.1%.
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Chen, Shih-Wei, and 陳世偉. "Single-Inductor Tri-Output DC-DC Boost Converter and Dual-Output Quadratic DC-DC Buck Converter." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/uy3282.
Texte intégralRésumé :
碩士<br>國立臺北科技大學<br>電腦與通訊研究所<br>97<br>There are two kinds of DC-DC converters presented in this study. One is the single-inductor tri-output (SITO) DC-DC boost converter, and the other one is the dual-output quadratic (DOQ) DC-DC buck converter. The proposed SITO DC-DC boost converter not only provides three output sources but also uses single inductor. The proposed DOQ DC-DC buck converter has a wider conversion ratio with ultra-low voltage for dual-output voltage sources. In this study, the methodology for controller design of DOQ DC-DC buck converter is given using average current-mode control.
The proposed circuits have been fabricated with TSMC 0.35mm 2P4M CMOS processes. The experimental results showed that SITO DC-DC boost converter can operate with supply voltage form 2.5V to 3.1V, which is suitable for single-cell lithium-ion battery supply applications. The output ripple voltage is about 40mV with a 220-μF off-chip capacitor and 10-μH off-chip inductor. The output maximum load current is up to 300mA. The output voltage range is from 2.8V to 4.4V. The maximum power efficiency is up to 86.9%.
The experimental results showed that DOQ DC-DC buck converter can operate with supply voltage form 4.5V to 5.5V. The output ripple voltage is about 50mV with a 10-μF off-chip capacitor and 5-μH and 6-μH off-chip inductor. The output maximum load current is up to 1A. The output voltage range is from 95mV to 1.25V.
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Hsieh, Wei-Lun, and 謝維倫. "High Switching DC-DC Buck Converters in Current Domain Control." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/33140296337803936596.
Texte intégralRésumé :
碩士<br>國立交通大學<br>電機與控制工程系所<br>97<br>For portable electronic device applications, high performance and compact size voltage regulator plays an important role to provide system power. To reduce the size of output filter, a high switching dc-dc buck converter is presented to achieve high integration. However, the conventional current mode DC-DC buck converter is not suitable to high switching design because the sub-circuits, which uses operational amplifier, restrict the bandwidth. That is to say, the limitation of circuit bandwidth causes incorrect operation and can not follow the system switching frequency. To ensure the switching regulator can operate at high switching frequency, the current domain PWM controller is presented in this thesis.
Owing the current domain PWM controller, the circuit implementation becomes simple and there are not any external compensation components. The control signals are transformed to current form to process addition of control signal directly. For providing a high performance supply voltage, the current domain PWM control is one of current-mode technique to get good line and load regulations.
In this thesis, a high switching DC-DC buck converter in current domain control with frequency 20MHz is implemented. The test chip was implemented by TSMC 2P4M 0.25-μm CMOS technology. Input operation range varies from 3.0V to 4.0V. The load regulation and line regulation are 0.18356mV/mA and 48.5mV/V respectively. The system features smaller output filter. That is, the inductor and output capacitor values are only 200nH and 5μF respectively. Fast transition response is achieved and demonstrates the design suitable for power management in the portable devices.
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Fan, Jia-Wei, and 范家維. "Design of Robust PD Controller for DC-DC Buck Converters." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/80592284996593687279.
Texte intégralRésumé :
碩士<br>國立臺北科技大學<br>自動化科技研究所<br>91<br>The objective of this thesis is to investigate the design of robust PD controller for the uncertain DC- DC buck converter, provided the transient and steady responses meet the
specifications while the component parameters vary.
At first, the concept of the state-space averaging method is adopted to establish the small signal model of the open-loop converter, and transfer functions of the PWM modulator and feedback voltage-sampling network are derived accordingly. When the PD controller is introduced in the loop, using Kharitonov theorem and Routh-Hurwitz Criterion, the range of the PD controller parameters is found over which the closed- loop converter keeps stability as component parameters vary. For the dynamic analysis of Buck converters, it is known that superior maximum overshoot and rise time can be obtained for the damping ratio of the system is one. Using this fact, Kharitonov Sixteen Plants theorem is applied to find out the range of the PD controller parameters over which the damping ratio is slightly larger than or equal to one. Consequently, the intersection of the obtained ranges indicates where the PD parameters can be assigned to meet the stability and transient specifications. In addition, the derived damping inequality that satisfies the transient specification is converted into the LFT formulation. Then we broach the concept of the structured singular value to verify whether our derived range of the controller parameters is correct or not.
Finally, by using Matlab/Simulink, the dynamic response of the converter with the proposed PD controller is simulated to demonstrate the practicality. The simulation also shows that the robust PD controller proposed in this thesis can improve the steady state error and the audiosusceptibility. It is mean that the robust PD controller improves the accuracy of the output voltage level and enhances the ability of suppressing the noise from input to output.
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Chung, Shiao-Chin, and 鍾曉春. "T-S Fuzzy Chaotic Control for Buck DC-DC Converters." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/ryge4e.
Texte intégralRésumé :
碩士<br>國立臺北科技大學<br>電機工程系研究所<br>101<br>This thesis mainly investigates the bifurcation and chaos suppression of buck DC-DC converters by using the Takagi-Sugeno (T-S) fuzzy controller. Firstly, a nonlinear converter is represented in the form of T-S fuzzy system and then controller gain matrices can be obtained by solving the linear matrix inequalities (LMI). Moreover, this study uses the MATLAB/SIMULINK software to simulate and observe, in the presence of variations of input voltage and load resistances, the output voltage characteristic, inductance current and the corresponding phase plane when the bifurcation and chaos phenomena occur at cycle 1, cycle 2 and the cycle 4, respectively. To control the chaotic system, a T-S fuzzy controller is introduced to change the output dynamics.
From the simulation results, it is found that the converter output dynamics remain at cycle 1 trajectory with the proposed T-S fuzzy controller. It verifies that the proposed controller has good control performance and the chaotic phenomenon is suppressed.
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Shiau, Jung-yi, and 蕭仲義. "Sliding mode voltage control of DC/DC buck-boost converter." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/99441053412284159291.
Texte intégralRésumé :
碩士<br>正修科技大學<br>機電工程研究所<br>97<br>Comparing with the conventional power converters, switching power converters possess the advantages of high efficiency, small size and wide range of voltage operation, so that they are widely applied in the application of portable electronic products and equipment in recent years. This thesis mainly focuses on the development and implementation of Buck/Boost converter with a sliding mode voltage controller, to achieve the stable desired controlled voltage output. Firstly, the stable sliding surface function is designed due to the control system. It can be observed that the entire controlled region can be divided into three subspaces. Based on Lyapunov stable theory, the controller is proposed to enforce the system trajectory from the arbitrary point toward the sliding surface in the finite time, remain on the surface and slides along to equilibrium point exponentially. In addition, based on a fixed frequency pulse width modulation technology, the proposed controller is realized by controlling the duty cycle of switch device to achieve desired stable voltage output under the influence of loading variation. The hardware system includes the integrated design of converters, controller, sawtooth signal generation circuit and drive circuit. According to the simulation software of PSpice, the, the encouraged system performance is validated by the testing of different loadings. Finally, the hardware system is implemented by analogic circuit to verify feasibility of the proposed control structure according to the different voltage inputs and loading uncertainties.
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Chen, Chien-cheng, and 陳建成. "A High Efficiency Current Mode Control DC-DC Buck Converter." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/07494232505610402844.
Texte intégralRésumé :
碩士<br>國立中央大學<br>電機工程研究所<br>99<br>In this changing rapidly era of electronic technology, the major demands of portable electronics are short, thin, and full functionalities. These sub-circuits of the portable electronics, which use batteries for power sources, need a stable supply voltage generating by power converters. These power converters must have low power consumption and high efficiency to extend the service time of portable electronics. Thus, a high efficiency current mode buck converter is presented in this thesis.
The proposed buck converter uses current-mode controlling mechanism to accelerate the transient response during the transient period. It senses the current variation of the output inductor. Therefore, it achieves low operating current and high efficiency by removing the V-to-I converting circuit. This buck converter has better performance in the specification of efficiency comparing with traditional buck converter with current-mode controlling. This current-mode buck converter is fabricated with TSMC 0.35um 3.3 V CMOS process. In the proposed buck converter, the operation voltage is form 3.8 V to 5.5 V, the output voltage is 3.3 V, the output current is from 0.05 A to 1 A, and the highest efficiency is 97.4 %. The line regulation and load regulation are 17.5 mV/V and 1.15 mV/A, respectively. The chip area is 2.46 mm2.
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Πετρίδης, Κωνσταντίνος. "Ανάλυση και έλεγχος boost και buck boost dc-dc μετατροπέων". Thesis, 2013. http://hdl.handle.net/10889/6419.
Texte intégralRésumé :
Στην παρούσα διπλωματική εργασία περιγράφεται η εφαρμογή μη γραμμικών μεθόδων ελέγχου στους Boost και Buck Boost DC-DC μετατροπείς που χρησιμοποιούν την τεχνική PWM. Συγκεκριμένα αναφερόμαστε στην μέθοδο ελέγχου βασισμένη σε παθητική σχεδίαση (PBC) καθώς και στην βασισμένη σε παθητική σχεδίαση μέθοδο ορισμού εσωτερικής ζεύξης και απόζευξης (IDA-PBC) και παρουσιάζουμε τα αποτελέσματα των εξομοιώσεων μέσω του προγράμματος Matlab-Simulink. Τέλος παρουσιάζεται ένας νέος μη γραμμικός-δυναμικός ελεγκτής, ικανός να διαμορφώσει την τάση εξόδου ανεξάρτητα από τον τύπο του φορτίου για τον DC-DC boost μετατροπέα.<br>The current diploma thesis discusses the application of nonlinear control methods for Boost and Buck Boost DC-DC converters using Pulse-Width-Modulation technique. Specifically we refer to the Passivity Based Control (PBC) as well as the Interconnection and Damping Assignment-Passivity Based Control (IDA-PBC) and Matlab-Simulink’s simulation results are presented. Finally, a new nonlinear dynamic control scheme suitable for DC-DC boost converter is introduced, capable of regulating the converter output at the desired level independently from the kind of the load.
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Chang, Chun-Ping, and 張俊評. "Improving the Efficiency of the Synchronous BUCK DC-DC Converter." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/41454281480277023397.
Texte intégralRésumé :
碩士<br>逢甲大學<br>電子工程所<br>94<br>In recent years, because the green energy concept is taken gradually, the key of power transformation efficiency gradually extends from the heavy to light load condition. In various types by the battery in the product as an electric power source, for example: Portable type product, the electric car as well as detached solar energy system and so on, the standby time (light load operation) is usually longer than use time (heavy load operates). Therefore, creating a high transformation efficiency to extend the standby time becomes a topic for study and discussion. This research mainly aims on the improvement regarding the transfer efficiency in the light load situation of synchronous buck converter, and carries on the verification by using the electric circuit simulation and the actual electric circuit.
This research suits the use in the synchronized rectification power circuit, especially for those portable type products that need to be operated in a long period of time. We expecting this thesis could have any contribution to power electronic.
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Chiu, Min-Chun, and 邱閔駿. "Design of CMOS DC-DC Buck Converter with Protection Capability." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/51866157385692987115.
Texte intégralRésumé :
碩士<br>國立勤益科技大學<br>電子工程系<br>101<br>Due to convenient operation and friendly user interface, portable electronic products are more popular today. For high efficiency, it is the most important consideration to achieve safety power conversion unit in portable electronic products. In addition, the semiconductor technologies are improved continuously. As a result, more functions can be integrated into a single chip and these electronic products have more functions within a small volume and with light weight. However, power supply units of circuits are needed to supply more various voltage levels to meet the requirements of circuit. In our design, design of CMOS DC-DC buck converter with input/output protection capability is also considered.
In this thesis, the architecture is used by both sensed inductor’s current and output voltage feedback to control of switching buck converter. Based on current mode pulse width modulation (PWM), the circuit can improve transient time response comparing to the voltage mode control PWM. This circuit also provides that input over voltage protection, input under voltage protection, and output current over protection. Thus, the power supply unit will operate successfully in a stable condition to avoid components burned and destroyed. The operating life time of auxiliary battery will then be further extended.
By using TSMC 0.35-um 3.3 V CMOS technology, the circuit is simulated. Input voltage is ranged of 2.4 V to 3.9 V. The operating frequency is 1 MHz. The capability of load current is ranged from 20 mA to 400 mA. The maximum conversion efficiency is 87.97 % when the circuit operates at 100 mA continuous conduction mode.
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Chin-HongChen and 陳津宏. "Average-Current-Mode Non-inverting Buck-Boost DC-DC Converter." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/77890091296649204660.
Texte intégralRésumé :
碩士<br>國立成功大學<br>電機工程學系碩博士班<br>98<br>With the increasing use of electrical portable devices, an efficient power management solution is needed to extend battery life. Generally, basic switching regulators (e.g., buck, boost) are not capable of using the entire battery output characteristics effectively (e.g., 2.7–4.2 V for Li-ion) to provide a fixed output voltage (e.g., 3.3V). In this work, an average-current-mode non-inverting buck-boost dc-dc converter is introduced, which can use the full-range output voltage of Li-ion battery with the advantages of high power efficiency, faster transient response, and excellent noise immunity.
The die area of this chip is 1.9x1.7 , which is fabricated by using Taiwan Semiconductor Manufacturing Company (TSMC) 0.35μm 2P4M 5V mixed-signal polycide process. The converter output is set to 3.3V, and can supply up to 300 mA load current. Its input votlage can range from 2.5V to 5V.
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Yu, Tsung-ta, and 游宗達. "Analysis and Design of Four Phase DC/DC Buck Conventer." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/42080621197588413956.
Texte intégralRésumé :
碩士<br>大同大學<br>電機工程學系(所)<br>96<br>The Voltage Regulator Module (VRM) concept was developed by Intel to guide the design of dc-dc converters that supply the required voltage and current to a Pentium® microprocessor. The maximum voltage is determined by the five-bit VID (Voltage Identity) code provided to the VRM. The five-bit, five-pin VID code connects the power supply controller to the corresponding pins on the microprocessor. Therefore, the internal coding in the microprocessor controls the dc voltage applied to processor. VRM guidelines are intended for a special module, usually a small circuit board, that plugs into the computer system board and supplies power for the microprocessor.
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楊文魁. "Sliding Mode Control Design of Switching Buck DC-DC Converters." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/23680105019427113826.
Texte intégralRésumé :
碩士<br>國立中興大學<br>電機工程學系<br>90<br>Abstract
This thesis develops modified PID(proportional-integral-derivative)-like sliding mode controllers for single buck DC-DC converter and paralleled buck DC-DC converters. The single buck DC-DC converters can be modeled as linear averaged systems with changeable loads, noise and parameter perturbations of uncertain load. Two models with different chosen state variables are employed to design the sliding mode controllers for buck DC-DC converters; the first one has two state variables of VO and iC and the second one three state variables of VO, iC and iL. These proposed control methods have been verified by computer simulation and their control performance has been shown to be satisfactory.
Modified PID-like slide model control laws for parallel connected buck DC-DC converters are presented to achieve both equal output current distribution and robust voltage regulation. Simulation results show that such controllers improve greatly the dynamic performance of parallel buck DC-DC converters, the controlled output voltage is robust against load disturbances and the controlled output current of each converter cell is identical. Finally, an interleave control method is introduced in order to reduce the switching loss and the ripple of output current.
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"Digitally Controlled DC-DC Buck Converters with Lossless Current Sensing." Doctoral diss., 2011. http://hdl.handle.net/2286/R.I.14398.
Texte intégralRésumé :
abstract: Current sensing ability is one of the most desirable features of contemporary current or voltage mode controlled DC-DC converters. Current sensing can be used for over load protection, multi-stage converter load balancing, current-mode control, multi-phase converter current-sharing, load independent control, power efficiency improvement etc. There are handful existing approaches for current sensing such as external resistor sensing, triode mode current mirroring, observer sensing, Hall-Effect sensors, transformers, DC Resistance (DCR) sensing, Gm-C filter sensing etc. However, each method has one or more issues that prevent them from being successfully applied in DC-DC converter, e.g. low accuracy, discontinuous sensing nature, high sensitivity to switching noise, high cost, requirement of known external power filter components, bulky size, etc. In this dissertation, an offset-independent inductor Built-In Self Test (BIST) architecture is proposed which is able to measure the inductor inductance and DCR. The measured DCR enables the proposed continuous, lossless, average current sensing scheme. A digital Voltage Mode Control (VMC) DC-DC buck converter with the inductor BIST and current sensing architecture is designed, fabricated, and experimentally tested. The average measurement errors for inductance, DCR and current sensing are 2.1%, 3.6%, and 1.5% respectively. For the 3.5mm by 3.5mm die area, inductor BIST and current sensing circuits including related pins only consume 5.2% of the die area. BIST mode draws 40mA current for a maximum time period of 200us upon start-up and the continuous current sensing consumes about 400uA quiescent current. This buck converter utilizes an adaptive compensator. It could update compensator internally so that the overall system has a proper loop response for large range inductance and load current. Next, a digital Average Current Mode Control (ACMC) DC-DC buck converter with the proposed average current sensing circuits is designed and tested. To reduce chip area and power consumption, a 9 bits hybrid Digital Pulse Width Modulator (DPWM) which uses a Mixed-mode DLL (MDLL) is also proposed. The DC-DC converter has a maximum of 12V input, 1-11 V output range, and a maximum of 3W output power. The maximum error of one least significant bit (LSB) delay of the proposed DPWM is less than 1%.<br>Dissertation/Thesis<br>Ph.D. Electrical Engineering 2011
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Wu, Kun You, and 吳坤祐. "Sliding-Mode Control Applied to Buck DC-DC Converter Design." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/90185981336242031257.
Texte intégralRésumé :
碩士<br>國立交通大學<br>電機學院碩士在職專班電機與控制組<br>95<br>A sliding mode controller with the error integration between output voltage and command voltage for PWM-based Buck DC-DC converter is proposed. Constant switching frequency can be achieved with the proposed approach. For the controller design, this thesis adopts sliding mode control theorem because of its well-know robustness for system uncertainty. Without load estimator in the controller, this closed-loop system ideally should convert power flow into the prescribed form in spite of the load variation. With the unknown load condition we choose a sliding function with an integral term of error function such that the system is stabilized on the sliding surface. Then design the control algorithm such that the system reaches the sliding mode in a finite time. The simulation of the proposed closed-loop control scheme is illustrated to process fast transient response and robustness to load variation.
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LAI, YANG-YUN, and 賴暘允. "Counter-Based Digital Pulsewidth Modulator For DC-DC Buck Converter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/bz8e9k.
Texte intégralRésumé :
碩士<br>國立暨南國際大學<br>電機工程學系<br>106<br>In today's DC-DC buck converter is widely used in a variety of electronic circuits, and I designed the DC buck converter is the use of digital control, and the use of digital pulse width modulator to modulate the voltage. This paper presents a counter-based digital pulse width modulator with high resolution and low hardware costs.
The digital DC buck converter in this thesis is composed of the basic structure of the buck converter and digital pulse width modulator. I implemented the digital pulse width modulator in the FPGA development board and integrated it with the PCB of the DC buck converter. Then the digital pulse width modulator to TSMC 180nm process and the use of Cell-Based Design flow design approach to tape-out. Finally, with the PCB of the DC buck converter integration and measurement. The final experimental measurements show that I can drop the input voltage from 1.8V~ 3V to 0.8V~ 2.5V. When operating at 3.3V input voltage and 1.8V output voltage, output ripple voltage is no higher than 100 millivolts and the conversion efficiency can reach 89.5%.
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Sabbarapu, Bharath Kumar. "DC-DC power converters with multiple outputs." Thesis, 2016. http://hdl.handle.net/1805/10998.
Texte intégralRésumé :
Indiana University-Purdue University Indianapolis (IUPUI)<br>This study presents a novel converter configuration that is related to the area DC-DC power converters. To begin with, a brief introduction is given by stating the importance of power electronics. Different types of converters, their operating principles and several new topologies that are being proposed over the years, to suit a particular application with specific advantages are listed in detail. In addition, pro- cedure for performing small signal analysis, which is one among the several averaging techniques is summarized in the first chapter. In the second chapter, small signal modeling is carried out on the single input dual output DC-DC buck converter. This analysis is performed to get a clear un- derstanding on the dynamics of this novel configuration. Routh stability criterion is also applied on this converter topology to determine the limiting conditions for operating the converter in its stability. Third chapter proposes the single input multiple output DC-DC synchronous buck converter. It’s operation, implementation and design are studied in detail. In further, small signal analysis is performed on this topology to determine the transfer function. In the following chapter, results obtained on comparison of a losses between the conventional and traditional topologies are presented in detail. In addition, results achieved during the analysis performed in the previous chapter are displayed. In the end, advantages and its highlights of this novel configuration proposed in this study is summarized. Future course of actions to be done, in bringing this configuration in to practice are discussed as well.
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Hsu, Hsin-Ju, and 許昕茹. "Automatic Layout Synthesis Tool for DC-DC Current-Mode Buck Converter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/64617872141924593723.
Texte intégralRésumé :
碩士<br>國立中央大學<br>電機工程學系<br>105<br>In our days, lots of electronic product are made of analog/mixed-signal (AMS) intergrated circuits (ICs), such as portable devices, medical equipment, communication product and automobile electronics etc. Nowadays, with the growing demands for portable devices, Time-to-Market cycle still keeps shrinking. Electronic design automation (EDA) tools are the keys to speed up the device process.
There are many existing EDA tools for digital circuits on the market. However, the EDA tools for AMS circuits are still not popular. Because analog circuits are often sensitive to small signals response, their layouts are often manually designed by experienced designers. Therefore, AMS circuit design has become the bottleneck in SoC design flow.
In order to increase the circuit performance and shorten design process, we perpose an automatic layout synthesis tool for DC-DC current-mode control buck converters in the thesis. This synthesis tool is able to generate the final layout of the target circuit automatically from given specification. The design environment is developed with C++ and Tcl/Tk programming language. The required layout can be generated in Laker automatically and pass the DRC/LVS verification. The post-layout simulation results also satisfy the required specification.
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Tzeng, Jun-Jie, and 曾俊傑. "A Voltage Mode DC-DC Buck Converter with Duty Cycle Detector." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/7e7u5q.
Texte intégralRésumé :
碩士<br>國立中央大學<br>電機工程學系<br>103<br>The proposed buck converter with duty cycle detector uses the voltage mode control as the feedback loop for system stability. The PID compensator integrated into the chip to reduce the number of passive components. It is good to portable electronic devices design thinness and lightweight. With duty cycle detector, proposed buck converter can detect the load current information to slow down the system operating frequency for reducing power consumption in very light load. The zero current detector prevents the inverse current, and reduces the conduction loss in light load. The dead time detector is used to optimize the dead time of control signal. The efficiency of system can be improved.
This buck converter has been fabricated with 0.18 um 3.3 V CMOS process. In the proposed buck converter, the operating voltage is from 2.7 V to 4.2 V, the output voltage is 1 V, the operating frequency is from 0.77 MHz to 1.44 MHz, the load current is from 25 mA to 1 A, and the peak efficiency is 88.87 %. The line regulation and load regulation are 6.67 mV/V and 1.02 mV/A, respectively. The chip area is 1.3225 mm2.
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Ho, Chun-Hsien, and 何俊賢. "Design and Analysis of Digital Control for Buck DC/DC Converters." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/97399156457452699002.
Texte intégralRésumé :
碩士<br>國立臺灣大學<br>電機工程學研究所<br>94<br>The thesis focuses on the feasibility of realizing a digital controller for a DC-DC switching Buck converter, and discusses what should be taken into account while designing such a controller and the problems that may be encountered.
The prevalent primary structure of a digital controller consists of three block, A/D converter, digital PID compensator, and the DPWM(Digital Pulse-Width-Modulated).
In the thesis one Buck converter hardware with a variable input voltage range 5~12V, output voltage 2V, output current varied from 2A to 2.5A had been carried out and one digital compensator written in assembly had been tested to observe if which could live up to the expectation.
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Lee, Te-Lun, and 李德崙. "A Study on the Dynamics of DC-DC Buck-Boost Converters." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/96824682581146433543.
Texte intégralRésumé :
碩士<br>中原大學<br>電機工程研究所<br>86<br>This thesis proposes a new way we offer to study the dynamics of the dc-dc buck-boost converters operating respectively in the continuous-conduction mode (CCM) and the discontinuous-conduction mode (DCM) by deriving the precise solutions and the accurate formulas. In the meantime, the computer simulations and the circuit experiments are given to confirm the theoretical results. The chief results of our work are as follows: (1) Using a very simple way, we can obtain the precise solutions to the dc-dc buck-boost converters operating individually in CCM and DCM. (2) By the precise solutions, we can classify two different cases of the output voltage waveforms respectively in CCM and DCM. (3) The simulations and the experiments of the dc-dc buck-boost converters can be performed to verify the results of the theoretical analyses individually in CCM and DCM. (4) The accurate formulas of the boundary between continuous and discontinuous conduction can be got. And the accurate formulas of the average output voltages and the output voltage ripples can also be gained individually in CCM and DCM. (5) The boundary between continuous and discontinuous conduction, the average output voltages and the output voltage ripples can be discussed when all of the system parameters are varied by means of the derived accurate formulas.
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Lian, Bo-Sheng, and 連柏勝. "Design of CMOS DC-DC Buck Converter with Dual Filtering Inductors." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/26602816816547867804.
Texte intégralRésumé :
碩士<br>國立勤益科技大學<br>電子工程系<br>101<br>This thesis proposes a novel DC-DC buck converter with dual filtering inductors to reduce the converter power consumption when the converter is operated at light loading. The converter operates in discontinuous conduction mode. Pulse frequency modulation is used as a control mechanism. Based on the loading status, this circuit will automatically switch to select the desired inductor. Comparison with single filter inductor DC-DC buck converter, the converter can effectively reduce power conduction loss. In addition, a block of dead time buffer is designed as the control signal of sample-and-hold circuit. Based on the control signal, the maximum peak voltage of the inductor can be sampled by the sample-and-hold circuit.
In this thesis, we have integrated a dc-dc buck converter successfully with dual filtering inductors by using TSMC 0.35-um technology. Using HSPICE simulation, the performance of whole circuit has been verified.
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Chin-WeiChang and 張晉瑋. "Single-Inductor Four-Switch Voltage-Mode Buck-Boost DC-DC Converter." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/73162145114489630707.
Texte intégralRésumé :
碩士<br>國立成功大學<br>電機工程學系碩博士班<br>98<br>With the rapid progress of semiconductor technology, all kinds of electronic products, especially portable electronics, appear in the market day by day. The most indispensable component for portable products is the battery that supplies energy, and determines the service life of the product. The supply voltage of the battery will drop gradually with time, which means the input voltage supplying by battery can be higher than, equal to, or lower than the desired voltage. Therefore, a DC-DC converter is required to convert the time-varying battery voltage to a fixed desired output voltage. Moreover, it would be better to have a high-efficiency buck-boost converter that can either step up or step down the battery voltage to a desired voltage.
The conventional buck-boost converters include flyback, inverting buck-boost, SEPIC, boost circuit with back end connects a buck circuit, etc. The above mentioned structures are either more complicated, more chip/PCB area, or having poor efficiency. Especially the inverting buck-boost architecture, the polarity of its output voltage is reversed. A four-switch buck-boost DC-DC converter was designed and presented in this thesis. The presented converter improves the efficiency, reduces the external component and chip/PCB area, compared with the above mentioned prototypes.
The input voltage range of the presented converter is 2.5~5.0V, its output voltage is set to 3.3V, load current range is 60~300 mA and switching frequency is 1 MHz. The chip was implemented by Taiwan Semiconductor Manufacturing Company (TSMC) 0.35μm 2P4M 5V mixed-signal polycide process, patronized by National Chip Implementation Center (CIC). The die area of the chip is 1.38 ×1.80 mm2, with 40 S/B package.
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Kuo, Chung-wei, and 郭忠韋. "DESIGN AND IMPLEMENTATION OF A 16 PHASE DC/DC BUCK CONVERTER." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/45639020549716818024.
Texte intégralRésumé :
碩士<br>大同大學<br>電機工程學系(所)<br>98<br>ABSTRACT
As the power consumption of microprocessors increase, a multi-phase voltage regulator is required to meet the power hunger and high efficiency requirements. In this thesis, in order to design and implementation of a 16 phase DC/DC buck converter, phase extender is applied on the power module of CPU on the motherboard. In general, the higher the phase number count, the more PWM outputs are required for the PWM controller. Consequently, developing a multi-phase PWM controller becomes very challenging and requires a high pin count package, resulting in high cost and complex layout design.
In this thesis, the IC of the phase extender is applied, and which can extend a PWM signal to two interleaved PWM signals. As a result, the purpose of extending 8 phases to 16 phases is achieved, and that can overcome the above mentioned problems. Moreover, the efficiency simulation of 16 phases power consumption is analyzed in this thesis, and the experimental results are provided. In order to reduce the phase numbers in the low loading, enhance the phase numbers in the high loading, lower power consumption and increase the efficiency, the phase shedding is used according to the loading.
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Zheng, Li-Ren, and 鄭力仁. "Design and Implementation of a Bidirectional Buck-Boost DC-DC Converter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/41810993725827533220.
Texte intégralRésumé :
碩士<br>國立臺灣科技大學<br>電機工程系<br>103<br>In this thesis, a digitally-controlled non-isolated bidirectional buck–
boost dc–dc converter is studied and implemented. The proposed converter
is capable of operating in all power conditions in buck/boost modes.
Through a novel modulation strategy and proper design of the buck-boost
inductance, zero voltage switching (ZVS) can be achieved and thus high
efficiency can be obtained. To further improve the efficiency, an adaptive
phase-shift control method which determines the phase shift between gating
signals according to the load level is also proposced. A low cost digital
signal controller dsPIC33FJ16GS502 is adopted in this thesis to realize the
power flow control, DC-bus voltage regulation and adaptive phase shift
control. As the modulation strategy is a software-based solution, there are
no requirement of additional circuits; therefore, it can be easily
implemented and reduces instability and noise susceptibility problems. To
validate the correctness and the effectiveness of the proposed method, a 300
W prototyping circuit is implemented and tested. According to the
experimental results, the measured efficiencies of all operating modes under
different loads are all higher than 90%.