Дисертації з теми "Digital time constant regulator"
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Huang, Bin. "Modeling and design of digital current-mode constant on-time control." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/31487.
Повний текст джерелаMaster of Science
Bari, Syed Mustafa Khelat. "A Novel Inverse Charge Constant On-Time Control for High Performance Voltage Regulators." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/82510.
Повний текст джерелаPh. D.
Tian, Shuilin. "Small-signal Analysis and Design of Constant-on-time V2 Control for Ceramic Caps." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/31812.
Повний текст джерелаMaster of Science
Marusiak, David. "MOS CURRENT MODE LOGIC (MCML) ANALYSIS FOR QUIET DIGITAL CIRCUITRY AND CREATION OF A STANDARD CELL LIBRARY FOR REDUCING THE DEVELOPMENT TIME OF MIXED-SIGNAL CHIPS." DigitalCommons@CalPoly, 2014. https://digitalcommons.calpoly.edu/theses/1363.
Повний текст джерелаPreston, Douglas. "Last Two Surface Range Detector for Direct Detection Multisurface Flash Lidar in 90nm CMOS Technology." Wright State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright150392243439439.
Повний текст джерелаАнтонец, Тарас Юрьевич. "Метод и устройство контроля кратковременной перегрузочной способности высоковольтного кабеля в условиях производства". Thesis, НТУ "ХПИ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/21791.
Повний текст джерелаDissertation for the degree of Ph. D. in Engineering Science, specialty 05.11.13 – Devices and methods of testing and materials structure determination. – National Technical University "Kharkov Polytechnic Institute", Kharkov, 2016. The thesis is devoted to the developing of control method of the short-term over-load capacity of high voltage cable in the conditions of production and the required complex of equipment for the verification of method. It was proposed the quantitative criterion of the short-term overload capacity of high voltage cable with cross linked polyethylene insulation for the control of the manufacturing cables in the conditions of production. It was created and proofed the complex of equipment for determination the criterion of the short-term overload capacity of high voltage cable in the conditions of production. The developed prompt method of the nondestructive testing of the quantitative criteria of the short-term overload capacity was tested on the 35 kV XLPE-cable.
Антонець, Тарас Юрійович. "Метод і пристрій контролю короткочасної перевантажувальної здатності високовольтного кабелю в умовах виробництва". Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/21790.
Повний текст джерелаDissertation for the degree of Ph. D. in Engineering Science, specialty 05.11.13 – Devices and methods of testing and materials structure determination. – National Technical University "Kharkov Polytechnic Institute", Kharkov, 2016. The thesis is devoted to the developing of control method of the short-term over-load capacity of high voltage cable in the conditions of production and the required complex of equipment for the verification of method. It was proposed the quantitative criterion of the short-term overload capacity of high voltage cable with cross linked polyethylene insulation for the control of the manufacturing cables in the conditions of production. It was created and proofed the complex of equipment for determination the criterion of the short-term overload capacity of high voltage cable in the conditions of production. The developed prompt method of the nondestructive testing of the quantitative criteria of the short-term overload capacity was tested on the 35 kV XLPE-cable.
Sattouf, Mousa. "Systém snímání dat a ovládání vodní elektrárny prostřednictvím internetové techniky." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-233685.
Повний текст джерелаMishra, Tanmay. "Development of A Reconfigurable Synchronous Machine Emulation Platform." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/6018.
Повний текст джерелаBo-TingYeh and 葉柏廷. "Sensorless Digital Switching Regulator with Dead-Time Self-Exploration." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/79043371567015496557.
Повний текст джерела國立成功大學
電機工程學系碩博士班
100
This thesis presents a sensorless digital regulator with dead-time self-exploration. The dead-time controller utilizes the relationship between duty-cycle command and power-loss to find the optimized dead-time without sensing any of the power-stage signals. A exploration algorithm with delay-line circuits instead of high frequency is used to accelerate the optimized dead-time searching and provides high quantization resolution with dead-time step. This approach is well suited for digital IC implementation. The FPGA experimental results show that the proposed architecture can quickly search the optimization of the dead-time and improve efficiency. After FPGA prototyping, the proposed DC-DC converter has been implemented in TSMC 1P6M 0.18μm CMOS technology. The chip size is 1.3 mm2 and the experimental results proved the same with FPGA experimental results.
"Time-Domain/Digital Frequency Synchronized Hysteresis Based Fully Integrated Voltage Regulator." Doctoral diss., 2019. http://hdl.handle.net/2286/R.I.55562.
Повний текст джерелаDissertation/Thesis
Doctoral Dissertation Electrical Engineering 2019
Chen, Chih-Wei, and 陳治瑋. "Tolerance Analysis of a Constant On-Time Current-Mode Voltage Regulator with Adaptive Voltage Position Feature." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/74643432336932285001.
Повний текст джерела國立臺灣大學
電機工程學研究所
101
In the past, the DC-DC converters used for computer power applications usually employ a constant-frequency variable-duty-cycle controller. This type of control, however, often causes low conversion efficiency under light-load conditions. In recent years, light-load efficiency has become a major design consideration for the reason that most of the electronic devices, whether for desk-top or hand-held applications, are most of the time operated under light-load conditions. Therefore, a new controller type, the constant-on-time controller, has been proposed and adopted in many applications recently. DC converters employing such a control scheme features relatively high light-load efficiency, compared to a conventional constant frequency converter, while maintaining good heavy-load efficiency. In this thesis, a tolerance analysis of a converter using a constant-on-time controller will be performed. More specifically, a multi-phased buck converter with adaptive-voltage positioning (AVP) feature employing a constant on-time controller will be analyzed. Two performance features of the converter will be the focus. One is the converter output load line with AVP feature, and the other is the feedback stability performance. The three traditional tolerance analysis methods are used. There are the extreme value analysis, the root-mean-square analysis, and the Monte-Carlo analysis. Sensitivity analysis is also performed that provides an insight into the sensitivity of the converter performances to component value tolerance. The results of these analyses provide useful design information in a high-volume production situation.
Lu, Yu-Hsuan, and 盧輿萱. "The Stability Analysis of a Ripple-Based Constant On-Time Voltage Regulator with a DC-Offset Correcting Circuit." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/38520613590104744865.
Повний текст джерела國立臺灣大學
電機工程學研究所
102
In recent years, the ripple-based constant on-time (RBCOT) control scheme for voltage regulators has been adopted in many applications because of its high efficiency feature under both the heavy-load and the light-load conditions. However, the basic RBCOT control suffers from output-voltage offset problem. Therefore, an offset correcting circuit (OC) is sometimes added to the basic RBCOT scheme to correct the problem for the applications in which output voltage precision is critical. This control scheme is abbreviated as OCRBCOT in this thesis. The main focus of this thesis is on the stability issue of a buck converter regulator using the OCRBCOT control scheme. Traditional low-frequency small-signal average models cannot be applied to the basic RBCOT due to inaccuracy [1]. A describing function approach was proposed and applied to model the behavior of a buck converter regulator employing the basic RBCOT scheme [2]. To model the conventional regulator using describing function approach is mathematically too complicated to be feasible. In this thesis, a time-domain analysis approach with a semi-empirical observation is used to address this issue. Experimental and simulation results are given to verify the stability criterion derived. The result obtained in the thesis, while not analytically proved, provides a useful tool for addressing the stability issue of a buck regulator with OCRBCOT control scheme. It also provides a way to eliminate the proper RC value of the offset correcting circuit to minimize the chip area of the OCRBCOT controller integrated circuit.
Yen, Ming-Chuan, and 顏銘川. "Analysis of AC Loading Effects on the Output Voltage Ripple of a Current-Mode Constant On-Time Buck Regulator." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/25215590509781538563.
Повний текст джерела國立臺灣大學
電機工程學研究所
102
In recent years, there have been two technical trends for the DC converters for powering computer central process units (CPUs). One of the trends is to push up conversion efficiency not only for the heavy-load condition but also for the light- load condition. The other trend is to interleave multi-channel converter to achieve high load current at low voltage output. For the reasons, current-mode (C.M) constant on-time (COT) control scheme has been widely adopted by industry in recent year. For CPU power converter applications, the average output voltage is usually required to provide adaptive voltage position (AVP) feature. The ripple voltage magnitude must also be keep within tight range, usually in the range of 30 mV, when the CPU load current is changing with time. To emulate the CPU current, a large square-wave load current ranging from several kilohertz to megahertz is usually imposed on the DC converter and tests the output voltage ripple voltage. The focus of the thesis is to investigate the AC loading effects on output ripple voltage. In this thesis, a qualitative analysis of the issue is first given using duty-cycle VI modulation spectrum theory. This analysis provides insight into the complexity of the issue. Then a quantitative analysis based on a time-domain approach is used to derive converter output voltage ripple in terms of the converter load current excitation. A solution is established for estimating the worst-case output ripple voltage due to repetitive large-step AC load current excitation of wide-range frequencies. The results are verified experimentally. A parametric sensitivity analysis for a practical converter is also provided to give an idea about the sensitivity of each parameter variation on the overall ripple magnitude. The analytical results obtained, although complicated, are useful to the designers.
Chen, Yi-Jing, and 陳以晉. "Fast-Response Digital Linear Voltage Regulator with Time-Sharing and Double-Edge-Triggered Techniques using Monolithic 3D IC." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/2f2d8g.
Повний текст джерела國立交通大學
電子研究所
107
In this thesis, a digitally controlled linear voltage regulator is proposed using monolithic 3DIC multi-FET BEOL circuits. The PMOS switch array which originally occupied the majority of the area of the digitally controlled voltage regulator is implemented between top metal layers for power grids using monolithic 3DIC BEOL technique for reducing the cost of silicon area. In thr proposed digital voltage regulator, a comparator-based error detector is used instead of an analog amplifier. Compared to the conventional digitally controlled linear voltage regulator, a comparator triggered at the positive and negative edges is utilized to achieve a fast response for the proposed digital voltage regulator. The time sharing method is also used in the shift register to reduce the power consumption due to the double edge triggered comparator. The proposed voltage regulator can adjust the PMOS strength by itself under different PVT and load variations, and achieves settling time by 200ns, quiescent current by 7.4μs and FOM 0.089ps. Furthermore, the total power efficiency is 99.94%.
Ding, Guanyu 1987. "Digital current mode control for multiple input converters." Thesis, 2012. http://hdl.handle.net/2152/ETD-UT-2012-08-6274.
Повний текст джерелаtext
Santos, Joaquim Bernardino dos. "Proof-of-concept of a single-point Time-of-Flight LiDAR system and guidelines towards integrated high-accuracy timing, advanced polarization sensing and scanning with a MEMS micromirror." Master's thesis, 2018. http://hdl.handle.net/1822/66134.
Повний текст джерелаThe core focus of the work reported herein is the fulfillment of a functional Light Detection and Ranging (LiDAR) sensor to validate the direct Time-of-Flight (ToF) ranging concept and the acquisition of critical knowledge regarding pivotal aspects jeopardizing the sensor’s performance, for forthcoming improvements aiming a realistic sensor targeted towards automotive applications. Hereupon, the ToF LiDAR system is implemented through an architecture encompassing both optical and electronical functions and is subsequently characterized under a sequence of test procedures usually applied in benchmarking of LiDAR sensors. The design employs a hybrid edge-emitting laser diode (pulsed at 6kHz, 46ns temporal FWHM, 7ns rise-time; 919nm wavelength with 5nm FWHM), a PIN photodiode to detect the back-reflected radiation, a transamplification stage and two Time-to-Digital Converters (TDCs), with leading-edge discrimination electronics to mark the transit time between emission and detection events. Furthermore, a flexible modular design is adopted using two separate Printed Circuit Boards (PCBs), comprising the transmitter (TX) and the receiver (RX), i.e. detection and signal processing. The overall output beam divergence is 0.4º×1º and an optical peak power of 60W (87% overall throughput) is realized. The sensor is tested indoors from 0.56 to 4.42 meters, and the distance is directly estimated from the pulses transit time. The precision within these working distances ranges from 4cm to 7cm, reflected in a Signal-to-Noise Ratio (SNR) between 12dB and 18dB. The design requires a calibration procedure to correct systematic errors in the range measurements, induced by two sources: the timing offset due to architecture-inherent differences in the optoelectronic paths and a supplementary bias resulting from the design, which renders an intensity dependence and is denoted time-walk. The calibrated system achieves a mean accuracy of 1cm. Two distinct target materials are used for characterization and performance evaluation: a metallic automotive paint and a diffuse material. This selection is representative of two extremes of actual LiDAR applications. The optical and electronic characterization is thoroughly detailed, including the recognition of a good agreement between empirical observations and simulations in ZEMAX, for optical design, and in a SPICE software, for the electrical subsystem. The foremost meaningful limitation of the implemented design is identified as an outcome of the leading-edge discrimination. A proposal for a Constant Fraction Discriminator addressing sub-millimetric accuracy is provided to replace the previous signal processing element. This modification is mandatory to virtually eliminate the aforementioned systematic bias in range sensing due to the intensity dependency. A further crucial addition is a scanning mechanism to supply the required Field-of-View (FOV) for automotive usage. The opto-electromechanical guidelines to interface a MEMS micromirror scanner, achieving a 46º×17º FOV, with the LiDAR sensor are furnished. Ultimately, a proof-of-principle to the use of polarization in material classification for advanced processing is carried out, aiming to complement the ToF measurements. The original design is modified to include a variable wave retarder, allowing the simultaneous detection of orthogonal linear polarization states using a single detector. The material classification with polarization sensing is tested with the previously referred materials culminating in an 87% and 11% degree of linear polarization retention from the metallic paint and the diffuse material, respectively, computed by Stokes parameters calculus. The procedure was independently validated under the same conditions with a micro-polarizer camera (92% and 13% polarization retention).
O intuito primordial do trabalho reportado no presente documento é o desenvolvimento de um sensor LiDAR funcional, que permita validar o conceito de medição direta do tempo de voo de pulsos óticos para a estimativa de distância, e a aquisição de conhecimento crítico respeitante a aspetos fundamentais que prejudicam a performance do sensor, ambicionando melhorias futuras para um sensor endereçado para aplicações automóveis. Destarte, o sistema LiDAR é implementado através de uma arquitetura que engloba tanto funções óticas como eletrónicas, sendo posteriormente caracterizado através de uma sequência de testes experimentais comumente aplicáveis em benchmarking de sensores LiDAR. O design tira partido de um díodo de laser híbrido (pulsado a 6kHz, largura temporal de 46ns; comprimento de onda de pico de 919nm e largura espetral de 5nm), um fotodíodo PIN para detetar a radiação refletida, um andar de transamplificação e dois conversores tempo-digital, com discriminação temporal com threshold constante para marcar o tempo de trânsito entre emissão e receção. Ademais, um design modular flexível é adotado através de duas PCBs independentes, compondo o transmissor e o recetor (deteção e processamento de sinal). A divergência global do feixe emitido para o ambiente circundante é 0.4º×1º, apresentando uma potência ótica de pico de 60W (eficiência de 87% na transmissão). O sensor é testado em ambiente fechado, entre 0.56 e 4.42 metros. A precisão dentro das distâncias de trabalho varia entre 4cm e 7cm, o que se reflete numa razão sinal-ruído entre 12dB e 18dB. O design requer calibração para corrigir erros sistemáticos nas distâncias adquiridas devido a duas fontes: o desvio no ToF devido a diferenças nos percursos optoeletrónicos, inerentes à arquitetura, e uma dependência adicional da intensidade do sinal refletido, induzida pela técnica de discriminação implementada e denotada time-walk. A exatidão do sistema pós-calibração perfaz um valor médio de 1cm. Dois alvos distintos são utilizados durante a fase de caraterização e avaliação performativa: uma tinta metálica aplicada em revestimentos de automóveis e um material difusor. Esta seleção é representativa de dois cenários extremos em aplicações reais do LiDAR. A caraterização dos subsistemas ótico e eletrónico é minuciosamente detalhada, incluindo a constatação de uma boa concordância entre observações empíricas e simulações óticas em ZEMAX e elétricas num software SPICE. O principal elemento limitante do design implementado é identificado como sendo a técnica de discriminação adotada. Por conseguinte, é proposta a substituição do anterior bloco por uma técnica de discriminação a uma fração constante do pulso de retorno, com exatidões da ordem sub-milimétrica. Esta modificação é imperativa para eliminar o offset sistemático nas medidas de distância, decorrente da dependência da intensidade do sinal. Uma outra inclusão de extrema relevância é um mecanismo de varrimento que assegura o cumprimento dos requisitos de campo de visão para aplicações automóveis. As diretrizes para a integração de um micro-espelho no sensor concebido são providenciadas, permitindo atingir um campo de visão de 46º×17º. Conclusivamente, é feita uma prova de princípio para a utilização da polarização como complemento das medições do tempo de voo, de modo a suportar a classificação de materiais em processamento avançado. A arquitetura original é modificada para incluir uma lâmina de atraso variável, permitindo a deteção de estados de polarização ortogonais com um único fotodetetor. A classificação de materiais através da aferição do estado de polarização da luz refletida é testada para os materiais supramencionados, culminando numa retenção de polarização de 87% (tinta metálica) e 11% (difusor), calculados através dos parâmetros de Stokes. O procedimento é independentemente validado com uma câmara polarimétrica nas mesmas condições (retenção de 92% e 13%).