Artykuły w czasopismach: „VOLTAGE CONVEYER”

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YUCE, ERKAN, KIRAT PAL i SHAHRAM MINAEI. "A HIGH INPUT IMPEDANCE VOLTAGE-MODE ALL-PASS/NOTCH FILTER USING A SINGLE VARIABLE GAIN CURRENT CONVEYOR". Journal of Circuits, Systems and Computers 17, nr 05 (październik 2008): 827–34. http://dx.doi.org/10.1142/s0218126608004733.

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In this paper, a novel circuit for realizing voltage-mode first-order and second-order all-pass filter responses as well as second-order notch filter response depending on the passive component choice, is presented. This circuit has high input impedance; thus, it is easy to cascade the introduced filter with other voltage-mode topologies. Also, it uses a single Variable Gain Current Conveyer — VGCCII and only grounded capacitors. SPICE simulation results based on 0.35 μm TSMC CMOS technology parameters are given to confirm the theory.

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Thongleam, Thawatchai, i Varakorn Kasemsuwan. "Feedforward Bulk-Driven Class AB Fully-Differential Second-Generation Current Conveyor (FDCCII)". Advanced Materials Research 979 (czerwiec 2014): 62–65. http://dx.doi.org/10.4028/www.scientific.net/amr.979.62.

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In this paper, a feedforward bulk-driven class AB fully-differential second-generation current conveyer (FDCCII) is presented. Bulk-driven differential pair is employed for the input stage allowing the FDCCII to operate with rail-to-rail operation. Feedfoward technique is also incorporated into input stage to increase the DC gain and minimize the common mode gain. The circuit performance is verified using HSPICE in 0.18 μm CMOS technology. The simulation results show rail-to-rail input and output swings. The DC voltage transfer characteristic between ports Y and X and DC current transfer characteristic between ports X and Z shows good linearity. The bandwidths show 25.7 MHz (VX/VY), 30 MHz (IZ/IX), respectively. The power dissipation is 267.5 μW.

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Lu, Wen Tao, i Yu Qing Li. "Research and Application of BPJV-1200/6K High Voltage Frequency Converter in Belt Conveyor". Applied Mechanics and Materials 494-495 (luty 2014): 1548–51. http://dx.doi.org/10.4028/www.scientific.net/amm.494-495.1548.

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In this paper, the BPJA-1200/6K mine-used high-voltage frequency converter designed and developed with Power Flex7000 is introduced. How to replace the fluid coupling used in original belt conveyor system with the converter to achieve the purpose of speed regulation by frequency variation as well as long distance driving are discussed. At the same time, the composition of the centralized control system for the belt conveyor is discussed and the speed regulation strategy and the main control functions are introduced. The converser system has been applied to a mine belt conveyor and the running results are better.

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Priya, E. Catherine Amala, i G. T. Sundar Rajan. "An improved model of hybrid multi converter used for grid connected applications". International Journal of Power Electronics and Drive Systems (IJPEDS) 10, nr 2 (1.06.2019): 860. http://dx.doi.org/10.11591/ijpeds.v10.i2.pp860-867.

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A Hybrid multi converter topology is proposed in this paper, which supplies simultaneous voltage’s for various levels from Renewable energy source. The proposed topology is realized by replacing Multi cuk- buck converter topology. The resultant hybrid multi converter requires less number of switches to operate, as well as various output voltages of different levels without interruption with increased stability. This type of hybrid multi converter with high reliability and high stability are well implemented for loads utilizing various levels of DC voltage. Converter, proposed in this paper is called Hybrid Multi converter topology (HMCT). A study is made on the steady state of the HMCT and a comparative study has been made with the conventional designs. A PI controller based feedback controller is designed to stabilize the various output voltages. A simulated model for the proposed HMCT is used to simulate various output voltages of dissimilar values from mono DC- input. The performance of the converter is demonstrated using simulation model. The proposed design can be protracted to voltage source inverter, multilevel inverter to produce AC output.

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Kannan, Nithiyananthan, Nithiyananthan Kannan i Sunil Thomas. "MATLAB/Simulink based simulations of KY converter for PV panels powered LED lighting system". International Journal of Power Electronics and Drive Systems (IJPEDS) 10, nr 4 (1.12.2019): 1885. http://dx.doi.org/10.11591/ijpeds.v10.i4.pp1885-1893.

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The main objective of this research work is to develop KY conveter topology for renewable energy sources.Solar energy is the readily available and is the cheapest form of energy. It is non-polluting and environment friendly. The development of high static gain DC-DC converters is an important research area due to the crescent demand of this technology for several applications supplied by low DC output voltage power sources. It is used to provide the uninterruptable power supply and battery powered to the system. So here, step-up DC-DC converters based on the KY converter are proposed for LED lighting systems. The proposed topologies present high voltages and high efficiency for low input voltage and high output voltage applications. The simulation results of the proposed topology have been presented using MATLAB/SIMULINK software.

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Abdul Kadir, Mohamed N., Yasir M. Y. Ameen i Harith Al-Badrani. "Development of an efficient voltage regulation mechanism for switched capacitor converter with exponential gain". Eastern-European Journal of Enterprise Technologies 6, nr 5 (120) (30.12.2022): 18–28. http://dx.doi.org/10.15587/1729-4061.2022.270316.

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The compact switched-capacitor converter with exponential gain and modular design has been adopted in this paper. Two approaches have been applied to improve the efficiency by providing multiple no-load voltages. The first modifies the switching strategy to bypass the gain of one or more stages. The second introduces modified design that provide additional no-load voltages through alternative current paths. The voltage regulation is implemented by two control loops: The outer loop is designed to produce the minimum feasible no-load voltage and the inner loop adjusts the duty ratio of the switching signals to regulate the voltage to meet the desired reference. Switched capacitor converters have been used as voltage multipliers with constant voltage gain. The efficiency of a switched capacitor converter depends on the ratio between regulated to unregulated output voltage. Therefore, output voltage adjustment of these converters causes a significant efficiency reduction. By providing multiple no-load voltages within the output voltage range the efficiency of the switched capacitor converter can be improved. The proposed design has been applied to a three-stage converter to provide six no-load voltages. Simulation results demonstrate that the average efficiency over the entire output voltage range is more than 90 % of its maximum efficiency of the unregulated switched capacitor converter which reflects the effectiveness of the proposed scheme. This paper offers an efficient method to regulate the voltage of a modular switched capacitor converter with exponential gain. The advantages of the proposed design are small number of added components, does not require additional sources and suitable for higher power range

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Natheer, Sara Khalid, i Mohamad Natiq Abdul Kadir. "Maximum resolution of switched capacitor converter: a graphical approach". International Journal of Power Electronics and Drive Systems (IJPEDS) 13, nr 1 (1.03.2022): 330. http://dx.doi.org/10.11591/ijpeds.v13.i1.pp330-339.

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The efficiency of a switched capacitor converter can be represented as the ratio of the output voltage to open-circuit voltage. Switched capacitor converters with adjustable gain are designed with multiple no-load voltages to obtain higher efficiency over the voltage control range. This paper aims to realize the maximum resolution of a switched capacitor converter. A graphical representation of the output voltages formation has been proposed. The voltage composition diagram reveals a switching pattern of the multiphase operation cycle that leads to the desired output voltage. The proposed method has been applied to determine all possible output voltage levels that lead to maximum resolution. A three-capacitor converter has been controlled with the proposed scheme. The simulation results show that the output voltage follows the reference voltage closely. The converter provides 60% more output voltage steps compared to the nearest comparable design in the literature.

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Utomo, W. M., N. A. A. Isa, A. A. Bakar, A. F. H. A. Gani, B. E. Prasetyo, H. Elmunsyah i Y. M. Y. Buswig. "Voltage tracking of bridgeless PFC cuk converter using PI controller". International Journal of Power Electronics and Drive Systems (IJPEDS) 11, nr 1 (1.03.2020): 367. http://dx.doi.org/10.11591/ijpeds.v11.i1.pp367-373.

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This paper proposes a Proportional-Integral (PI) control voltage tracking of Bridgeless Power Factor Correction (BPFC) Cuk converter. In order to investigate the behaviour of different output voltages during overshoot, steady state and step response, P.I controller is designed to set the -42 V, -48 V, -54 V output voltages. The simulation results show that the proposed PI controller able to control the output voltage and achieve fast steady state and step response of BPFC Cuk converter. When the value of output voltage increase, the overshoot voltage will become higher but the steady state respond will be faster. Furthermore, BPFC Cuk converter with P.I controller have low output voltage ripples.

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Vaishnavi, Gatla, C. Venkatesh, Madikonda Rumitha i Abhishek Shanmukhan. "Single-Input Dual-Output Three-Level DC–DC Converter for EV". International Journal of Advance Research and Innovation 10, nr 1 (2022): 48–53. http://dx.doi.org/10.51976/ijari.1012208.

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This paper presents the development of a non-isolated single-input dual-output three-level dc–dc converter (SIDO-TLC) appropriate for medium- and high-voltage applications. 3 level Buck-Boost converter is used in order to achieve the controllable output voltages. The main merits of this project include reducing voltage stress across semiconductor devices, improving efficiency, and reducing passive components size. This converter shows very good stability, even under simultaneous step changes of the loads and input voltage. Simulation analysis of converter output voltages for various duty cycles is presented for three cases of duty cycle control range.

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Petrović, Predrag B., Milan Vesković i Slobodan Đukić. "Voltage mode electronically tunable full-wave rectifier". Journal of Electrical Engineering 68, nr 1 (1.01.2017): 61–67. http://dx.doi.org/10.1515/jee-2017-0008.

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Abstract The paper presents a new realization of bipolar full-wave rectifier of input sinusoidal signals, employing one MO-CCCII (multiple output current controlled current conveyor), a zero-crossing detector (ZCD), and one resistor connected to fixed potential. The circuit provides the operating frequency up to 10 MHz with increased linearity and precision in processing of input voltage signal, with a very low harmonic distortion. The errors related to the signal processing and errors bound were investigated and provided in the paper. The PSpice simulations are depicted and agree well with the theoretical anticipation. The maximum power consumption of the converter is approximately 2.83 mW, at ±1.2 V supply voltages.

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Monteiro, Joaquim, V. Fernão Pires, Daniel Foito, Armando Cordeiro, J. Fernando Silva i Sónia Pinto. "A Buck-Boost Converter with Extended Duty-Cycle Range in the Buck Voltage Region for Renewable Energy Sources". Electronics 12, nr 3 (24.01.2023): 584. http://dx.doi.org/10.3390/electronics12030584.

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Buck-boost DC–DC converters are useful as DC grid interfaces for renewable energy resources. In the classical buck-boost converter, output voltages smaller than the input voltage (the buck region) are observed for duty cycles between 0 and 0.5. Several recent buck-boost converters have been designed to present higher voltage gains. Nevertheless, those topologies show a reduced duty-cycle range, leading to output voltages in the buck region, and thus require the use of very low duty cycles to achieve the lower range of buck output voltages. In this work, we propose a new buck-boost DC-DC converter that privileges the buck region through the extension of the duty-cycle range, enabling buck operation. In fact, the converter proposed here allows output voltages below the input voltage even with duty cycles higher than 0.6. We present the analysis, design, and testing of the extended buck-boost DC-DC converter. Several tests were conducted to illustrate the characteristics of the extended buck-boost DC-DC converter. Test results were obtained using both simulation software and a laboratory prototype.

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Huang, Chien-Chun, Tsung-Lin Tsai, Yao-Ching Hsieh i Huang-Jen Chiu. "A Bilateral Zero-Voltage Switching Bidirectional DC-DC Converter with Low Switching Noise". Energies 11, nr 10 (1.10.2018): 2618. http://dx.doi.org/10.3390/en11102618.

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This paper proposes a novel bilateral zero-voltage switching (ZVS) bidirectional converter with synchronous rectification. By controlling the direction and timing of excessive current injection, the main power switches can achieve bilateral ZVS under various loads and output voltages. Compared with the common soft-switching power converter with only zero-voltage turn-on, the proposed bilateral ZVS bidirectional converter can achieve both zero-voltage switching on and off in every switching cycle. This feature can alleviate the output switching noise due to the controlled rising and falling slope of the switch voltage. Furthermore, the voltage slopes almost remain unchanged over a wide range of output voltages and load levels. The most important feature of bilateral ZVS is to reduce the output switching noise. Experimental results based on a 1 kW prototype are presented to demonstrate the performance of the proposed converter. From experimental results on the proposed scheme, the switching noise reduction is about 75%.

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T, Arunkumari, I. Jagadeesh i Indragandhi V. "Design and implementation of modified multilevel sepic converter for PV based apllications". Indonesian Journal of Electrical Engineering and Computer Science 14, nr 3 (1.06.2019): 1125. http://dx.doi.org/10.11591/ijeecs.v14.i3.pp1125-1133.

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In this manuscript, a DC-DC converter of modified multilevel sepic model with single switch is proposed here. The designed converter combines the voltage tripler circuit, which improves the voltage gain and reduces the voltage ripple of the system. Another feature of the designed converter is reduces the voltage stress and utilized for PV based applications. The operation of the designed converter in Continuous-Conduction Mode (CCM) is discussed. The converter boosts the PV input voltage of 30 V to 400 V output voltages. The efficiency attained by the designed converter is 94%. The Theoretical analysis of the designed converter is presented and it is done with MATLAB simulink. To analyse the performance of this DC-DC converter a model was developed and tested. From the experimental results obtained, it is analysed that the converter performs better and suitable for PV based application.

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Sivapriyan, R., i D. Elangovan. "Impedance-Source DC-to-AC/DC Converter". Electronics 8, nr 4 (16.04.2019): 438. http://dx.doi.org/10.3390/electronics8040438.

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This article presents a novel impedance-source-based direct current (DC)-to-alternating current (AC)/DC converter (Z-Source DAD Converter). The Z-Source DAD converter converts the input DC voltage into AC or DC with buck or boost in the load voltage. This Z-Source DAD conversion circuit is a single-stage power conversion system. This converter circuit converts the input DC voltage into variable-magnitude output DC voltage or converts the DC voltage into a variable-magnitude output AC voltage. The higher voltage magnitude in boost mode can be controlled by controlling the shoot-through (ST) state timing of the converter. MATLAB-Simulink simulation and microcontroller-based hardware circuit results are presented to demonstrate power conversion with the buck and boost features of the Z-Source DAD converter for both types of output voltages. The simulation and experimental results show that the Z-Source DAD converter converts the given DC supply into AC or DC with buck or boost in the output load voltage.

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Suyanto, M., Subandi Subandi, Syafriyudin Syafriyudin i Isa Mubarok. "Sistem Pengujian Tegangan Boost Converter Pada Pembangkit ListrikTenaga Air (PLTH) Picohydro Kapasitas Rendah". Journal of Electrical Power Control and Automation (JEPCA) 3, nr 1 (23.07.2020): 8. http://dx.doi.org/10.33087/jepca.v3i1.33.

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Voltage testing, on hybrid power plants (PLTH), uses two sources that are solar/solar power plants and waterwheel power plants. Supporting components to produce electric energy conversion one of them is boostconverter which is the main subject. Therefore the author is interested in making and testing the voltage, on the boost converter with the aim to maximize the performance of the DC Genertator as a pensupplay Batterai/accu on PLTH Pico Hydro. The DC-voltage source of the DC-DC converter can be obtained from a generator, or an AC voltage source that is air-conditioned to DC. While Dc-DC converter is a power electronic circuit, to convert a DC to DC voltage input into the output voltage with a greater value. The test results of the voltage from the field data can be concluded as follows. The voltage boost converter test results, on the Pico Hydro Hybrid power plant can produce a voltage of 13 volts from the output DC Generator 8.39 Volt. The output voltage generated by the boost converter is 13.4 volts, can be stable although the output voltage of the generator is variable. With the addition of the tool boost converter on PLTH Pico Hydro, can help battery charging/ACCU to charge the required voltage of the battery is 12 volts, from the boos convevter 13.4 volt long time charging ACCU 5.3 hours.

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Lin, Bor-Ren. "Analysis and Implementation of a Phase-Shift Pulse-Width Modulation Converter with Auxiliary Winding Turns". Energies 13, nr 1 (2.01.2020): 222. http://dx.doi.org/10.3390/en13010222.

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A phase-shift pulse-width modulation converter is studied and investigated for railway vehicle or solar cell power converter applications with wide voltage operation. For railway vehicle applications, input voltage range of dc converters is requested to have 30–40% voltage variation of the nominal input voltage. The nominal input voltages of dc converters on railway vehicles applications may be 37.5 V, 48 V, 72 V, 96 V and 110 V. Therefore, a new dc converter with wide input voltage operation from 25 to 150 V is presented to withstand different nominal input voltage levels such as 37.5–110 V on railway power units. To realize wide input voltage operation, an auxiliary switch and auxiliary transformer windings are used on output side of conventional full-bridge converter to have different voltage gains under different input voltage values. Phase-shift pulse-width modulation is adopted in the developed dc converter to accomplish soft switching operation on power switches. To confirm and validate the practicability of the presented converter, experiments based on a 300 W prototype were provided in this paper.

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Yaseen, Muhammad, Ajmal Farooq, Muhammad Zeeshan Malik, Muhammad Usman, Ghulam Hafeez i Muhammad Ali. "Design of a High Step-Up DC-DC Converter with Voltage Doubler and Tripler Circuits for Photovoltaic Systems". International Journal of Photoenergy 2021 (21.09.2021): 1–11. http://dx.doi.org/10.1155/2021/8993598.

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In this paper, a high step-up DC-DC interleaved boost converter is proposed for renewable sources with low voltages such as photovoltaic module and fuel cell. The proposed converter uses interleaving method with an additional voltage doubler and tripler circuit. In the proposed converter, the inductor at all phases is operated to gain high voltage through voltage doubler and tripler circuit capacitors with suitable duty cycle. The proposed topology operates in six switching states in one period. The steady-state analysis and operating principle are examined comprehensively which shows numerous improvements over the traditional boost converter. These improvements are high-voltage gain and low-voltage stress across switches. The proposed DC-DC interleaved boost converter has a gain/conversion ratio four times that of the conventional interleaved boost converter and four times less-voltage stress across the main switches. Simulation has been done in Matlab Simulink on a 70% duty cycle, and results are compared with conventional interleaved boost converter. For an input voltage of 15 volts, the proposed converter is able to generate an output voltage of 200 volts at 70% duty cycle with a voltage stress of 50 volts across main switches, whereas traditional interleaved boost converter generates 200 volts from same input voltage at 92.5% duty cycle with voltage stress of 200 volts across switches. From simulation results, it is clear that the proposed converter has better performance as compared to conventional interleaved boost converter for same design parameters.

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Ezra, Noam, Toine Werner i Teng Long. "Dual Voltage Forward Topology for High Efficiency at Universal Mains". Electronics 11, nr 7 (24.03.2022): 1009. http://dx.doi.org/10.3390/electronics11071009.

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This paper introduces a forward converter aimed at the universal mains voltages, i.e., 220–230 Vac and 115 Vac, named the ‘dual voltage forward converter’. The suggested converter has a narrow dynamic range at the universal mains voltages, which results in lower stress on devices, optimal duty cycles, and better overall efficiency. The topology comprises two primary power loops reconfigurable by additional two-state switches and a passive diode, which allows the converter to run in parallel or in series modes and increase the performance over the full universal mains range of 90–265 Vac. The utilization of the devices is better, as they experience lower voltage and current stress by supporting two optimized working points. A converter operating at 100 kHz with an output power of 75 W and output voltage of 12 Vdc was designed and tested. The results were compared with a conventional forward converter with the identical specification. The results at the low mains were similar between the converters; however, at the high mains, the efficiency improvement was between 5% and 23%.

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Bityukov, V. K., A. I. Lavrenov i D. A. Malitskiy. "Analysis of the DC/DC Zeta topology converter ripples by applying its limiting continuous mathematical model". Russian Technological Journal 11, nr 4 (1.08.2023): 36–48. http://dx.doi.org/10.32362/2500-316x-2023-11-4-36-48.

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Objectives. A DC/DC Zeta topology converter represents a unipolar electronic device for converting an input positive voltage into a stabilized output voltage of the same polarity, which can be set at voltages both below and above the input voltage. The aim of this work is to analyze Zeta converter circuitry, which requires the following tasks to be solved: using Kirchhoff’s Circuit Laws, obtain systems of equations describing converter operation in the phase of energy accumulation and in the phase of energy transfer; using a method proposed by A.I. Korshunov, combine the resulting systems of equations into a marginal continuous mathematical model; using expressions describing constant components of currents and voltages in Zeta converter, analyze their ripples and obtain equations for their calculation; compare the current and voltage values obtained from the continuous limiting mathematical model with the Zeta simulation results.Methods. The tasks are solved using Kirchhoff’s rules and the method for obtaining the limiting continuous mathematical model proposed by A.I. Korshunov. The results are analyzed using a circuit modelling in NI Multisim.Results. It is shown that the phase coordinates of the mathematical model tend to real values of converter currents and voltages at a switching frequency of the power switch of more than 200 kHz. A strong correspondence was established between the calculated ripple values and their values obtained in the simulation (when changing the duty factor).Conclusions. Mathematical models comprise the basis of unified calculation methods for any radio electronic circuit. The developed limiting continuous mathematical model allows a range of changes in current flowing through the choke windings and voltages on capacitor plates to be evaluated, including their maximum and minimum values for various converter parameters, such as power switch switching frequency, duty factor, element ratings, etc. Obtaining this information in turn enables the rational selection of the electronic component base of the converter.

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Chang, Long-Yi, Kuei-Hsiang Chao i Tsang-Chih Chang. "A High Voltage Ratio and Low Ripple Interleaved DC-DC Converter for Fuel Cell Applications". Scientific World Journal 2012 (2012): 1–11. http://dx.doi.org/10.1100/2012/896508.

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This paper proposes a high voltage ratio and low ripple interleaved boost DC-DC converter, which can be used to reduce the output voltage ripple. This converter transfers the low DC voltage of fuel cell to high DC voltage in DC link. The structure of the converter is parallel with two voltage-doubler boost converters by interleaving their output voltages to reduce the voltage ripple ratio. Besides, it can lower the current stress for the switches and inductors in the system. First, the PSIM software was used to establish a proton exchange membrane fuel cell and a converter circuit model. The simulated and measured results of the fuel cell output characteristic curve are made to verify the correctness of the established simulation model. In addition, some experimental results are made to validate the effectiveness in improving output voltage ripple of the proposed high voltage ratio interleaved boost DC-DC converters.

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Kommula, Bapayya Naidu, i Venkata Reddy Kota. "A novel single input double output (SIDO) converter for torque ripple minimization in solar powered BLDC motor". International Journal of Renewable Energy Development 8, nr 2 (13.06.2019): 161. http://dx.doi.org/10.14710/ijred.8.2.161-168.

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This paper proposes a new converter topology for torque ripple reduction in Brushless DC (BLDC) motor. Due to the torque ripple problem, the use of this motor is limited to few applications. In this paper, a Single Input Double Output (SIDO) converter is proposed to suppress the torque ripple in BLDC motor. The proposed SIDO converter provides two output voltages. One for supplying the motor throughout conduction time and second output voltage is given to the non-commutating phase of motor during commutation instants. This proposed SIDO converter is fed from Photo Voltaic (PV) system. This paper also presents a new Maximum Power Point Tracking (MPPT) based on trisection of Power-Voltage characteristics (TPVC) to attain the maximum power from the PV system. This scheme takes only 7 iterations to reach MPP. The intended configuration is developed and simulated in Matlab/Simulink environment. The results justify the superiority of proposed scheme that minimizes torque ripple in BLDC motor to only 6 to 12% from 50 to 80 % in conventional scheme and also extracts maximum power from PV system. ©2019. CBIORE-IJRED. All rights reserved

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Khaledian, Amir, Babak Abdi, Javad Shokrollahi Moghani i Mehrdad Abedi. "An Overview to Soft Switching Converters with High Voltage Gain". Advanced Materials Research 462 (luty 2012): 353–57. http://dx.doi.org/10.4028/www.scientific.net/amr.462.353.

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A comparison is made in this paper between three high voltage gain converters. The first one is a boost converter with an additional level including a coupling inductor for increasing the voltage gain. The second is a converter that is capable to be extended to N parallel converter and the third one uses a clamp circuit to increase gain with a coupled inductor. Three converters are compared in voltage and current peak value and utilization coefficient of active switch and output diode, their ZVS and ZCS condition in the ON and OFF time and voltage gain. Finally the first converter circuit is simulated in PSpice with the two other converters input voltages and the results are compared.

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Mitra, Lopamudra, i Ullash Kumar Rout. "Single Switched Non-isolated High Gain Converter". International Journal of Power Electronics and Drive Systems (IJPEDS) 8, nr 1 (1.03.2017): 20. http://dx.doi.org/10.11591/ijpeds.v8.i1.pp20-30.

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This paper presents a new single switched inductor- capacitor coupled transformer-less high gain DC-DC converter which can be used in renewable energy sources like PV, fuel cell in which the low DC output voltage is to be converted into high dc output voltage. With the varying low input voltages, the output of DC-DC converter remains same and does not change. A state space model of the converter is also presented in the paper. This constant output voltage is obtained by close loop control of converter using PID controller. High voltage gain of 10 is obtained without use of transformer. All the simulations are done in MATLAB-SIMULINK environment.

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Sabir, Bushra, Shiue-Der Lu, Hwa-Dong Liu, Chang-Hua Lin, Adil Sarwar i Liang-Yin Huang. "A Novel Isolated Intelligent Adjustable Buck-Boost Converter with Hill Climbing MPPT Algorithm for Solar Power Systems". Processes 11, nr 4 (27.03.2023): 1010. http://dx.doi.org/10.3390/pr11041010.

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This study proposes a new isolated intelligent adjustable buck-boost (IIABB) converter with an intelligent control strategy that is suitable for regenerative energy systems with unsteady output voltages. It also serves as a reliable voltage source for loads such as battery systems, microgrids, etc. In addition, the hill climbing (HC) maximum power point tracking (MPPT) algorithm can be utilized with this innovative IIABB converter to capture the MPP and then enhance system performance. In this converter, five inductors (LA, LB, LC, LD, and LE) and four power MOSFETs (SA, SB, SC, and SD) are used in the proposed novel isolated intelligent adjustable buck-boost (IIABB) converter to adjust the applied voltage across the load side. It also has a constant, stable output voltage. The new IIABB converter is simulated and verified using MATLAB R2021b, and the performances of the proposed IIABB converter and conventional SEPIC converter are compared. The solar photovoltaic module output voltages of 20 V, 30 V, and 40 V are given as inputs to the proposed IIABB converter, and the total output voltage of the proposed converter is 48 V. In the new IIABB converter, the duty cycle of the power MOSFET has a small variation. The proposed IIABB converter has an efficiency of 92~99%. On the other hand, in the conventional SEPIC converter, the duty cycle of a power MOSFET varies greatly depending on the relationship between the output and input voltage, which deteriorates the efficiency of the converter. As a result, this research contributes to the development of a novel type of IIABB converter that may be employed in renewable energy systems to considerably increase system performance and reduce the cost and size of the system.

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Amudhavalli, Dhanaraj, Nalin Kant Mohanty i Ashwin Kumar Sahoo. "Interleaved quadratic boost converter integrated with Dickson voltage multiplier with energy storage for high power photo voltaic applications". International Journal of Power Electronics and Drive Systems (IJPEDS) 12, nr 2 (1.06.2021): 957. http://dx.doi.org/10.11591/ijpeds.v12.i2.pp957-967.

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In this paper interleaved quadratic boost converter with Dickson voltage multiplier is proposed. Photovoltaic system is connected to high power load through the proposed converter. Structure of this high gain interleaved converter comprised of two stages: interleaved quadratic boost converter stage and Dickson voltage multiplier stage. Interleaved quadratic boost converter is a parallel combination of two quadratic boost converter. The interleaving increases frequency of converter that could be filtered using small capacitors, making input current smoother than the current of conventional quadratic boost converter. Thus, interleaved circuit minimizes current ripple present in input current, cascading of voltage multiplier cell increases the gain voltage ratio of converter making it suitable for high power, high voltage gain photo voltaic applications. Stress voltage of the switches and reverse recovery problems gets reduced, thereby reducing EMI problems. 300W prototype capable of increasing 24V input voltage to 400V output voltage is designed and results tested using MATLAB/Simulink software. Hardware prototype is also implemented to verify simulation results. Also, application of this converter in integrated energy storage is demonstrated.

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ARSLAN, EMRE, SHAHRAM MINAEI i AVNI MORGUL. "ON THE REALIZATION OF HIGH PERFORMANCE CURRENT CONVEYORS AND THEIR APPLICATIONS". Journal of Circuits, Systems and Computers 22, nr 03 (marzec 2013): 1350015. http://dx.doi.org/10.1142/s0218126613500151.

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In this work, a wideband and high-performance CMOS implementation of 2nd-generation current conveyor (CCII) is proposed. The proposed circuit is composed of a high performance voltage follower stage which is based on differential pairs to provide high voltage swings on input and output ports and a current follower stage. It is shown that the proposed voltage follower stage can be used to implement high performance 1st and 3rd-generation current conveyors (CCI and CCIII, respectively) that have very small equivalent impedances on ports X, high equivalent impedances on ports Y and Z and also high-valued voltage and current transfer bandwidths. 2nd and 3rd order filter circuits as well as a half-wave rectifier circuit are given to show the performance and usefulness of the proposed current conveyor circuits. The simulation and experimental results are given to verify the theoretical analyses.

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27

HOU, AN SANG. "AN ACCURATE AND MATCHING-FREE THRESHOLD-VOLTAGE MEASUREMENT SYSTEM FOR FLOATING-GATE MOS TRANSISTORS". Journal of Circuits, Systems and Computers 14, nr 03 (czerwiec 2005): 423–37. http://dx.doi.org/10.1142/s0218126605002465.

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Due to its programmable threshold-voltage characteristic, the floating-gate MOS transistor (FGT) plays an important role in the low-power applications. To tune the threshold voltages of FGTs accurately, a real-time system is presented to measure the threshold voltages. The system includes decoders, analog multiplexers, threshold-voltage measurement block, A/D converter and 32-bit advanced RISC machine (ARM). The feedback technique is applied so that the threshold voltages of FGTs can be measured with high accuracy. The measurement error lies in the range of ±0.3% with 16-bit A/D converter, and there has no constraint on the choice of capacitances between floating-gate and control-gate. The proposed measurement system does not require any matched component. The mathematical models of threshold-voltage measurement block are also presented. Thus, the accuracy of threshold-voltage measurements can be verified with these models.

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Dillersberger, Harald, Bernd Deutschmann i Douglas Tham. "A Bipolar ±13 mV Self-Starting and 85% Peak Efficiency DC/DC Converter for Thermoelectric Energy Harvesting". Energies 13, nr 20 (20.10.2020): 5501. http://dx.doi.org/10.3390/en13205501.

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This paper presents a novel converter for boosting the low-voltage output of thermoelectric energy harvesters to power standard electronic circuits. The converter can start up from a fully depleted state of the system off a bipolar ±13 mV input and can boost it to output voltages of up to 5 V. The converter comprises two transformers, one for each polarity that are multiplexed between an oscillator (used during startup) and a flyback converter (used during normal operation). To eliminate leakage currents in the input stage, the unused converter is completely turned off at startup and both converters are automatically shut off if the input power is found to be too low. Measurement results of the converter designed in a 180 nm CMOS process demonstrate a peak end-to-end conversion efficiency of 85% and nearly perfect impedance matching over the full input voltage range. This is the first time that a converter for ultra-low bipolar input voltages achieves the same performance as a unipolar converter.

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Dalala, Zakariya, Osama Saadeh, Mathhar Bdour i Zaka Zahid. "A New Maximum Power Point Tracking (MPPT) Algorithm for Thermoelectric Generators with Reduced Voltage Sensors Count Control †". Energies 11, nr 7 (12.07.2018): 1826. http://dx.doi.org/10.3390/en11071826.

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This paper proposes a new maximum power point tracking (MPPT) algorithm for thermoelectric generators (TEG). The new-presented method is based on implementing an indirect open circuit voltage detection and short circuit current estimation methods, which will be used to directly control the TEG interface power converter, resulting in reaching the maximum power point (MPP) in minimal number of steps. Two modes of operation are used in the proposed algorithm, namely the perturb and observe (P&O) method for fine-tuning and the transient mode for coarse tracking of the MPP during fast changes that occur to the temperature gradient across the structure. A novel voltage sensing technique as well is proposed in this work, to reduce the number of voltage sensors used to control and monitor the power converter. The proposed strategy employs a novel approach to sense two different voltages using the same voltage sensor. The input and output voltage information is collected from an intermediate point in the converter. The reconstructed voltages are used in the control loops as well as for monitoring the battery output or load voltages. Simulation and experimental results are provided to validate the effectiveness of the proposed algorithm and the sensing technique.

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Stala, Robert, Andrzej Mondzik, Adam Penczek, Zbigniew Waradzyn i Aleksander Skała. "All-Bootstrap Gate-Driver Supply System for a High-Voltage-Gain Resonant DC-DC Converter with Seven Switches". Power Electronics and Drives 5, nr 1 (1.01.2020): 135–42. http://dx.doi.org/10.2478/pead-2020-0011.

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Abstract This paper presents the concept and implementation of an electronic system for a switched-capacitor DC-DC converter with high voltage gain. The converter consists of seven switches, five of which being controlled like high-side type. This paper presents a non-typical bootstrap-based gate-driver system so that the converter can run using a single voltage source. The converter requires a special switching pattern to drive seven switches in a steady state and also during the start-up of the converter and the regulation of the output voltage. Therefore, an FPGA-based digital control system is used with various switching algorithms and protection functions implemented. The presented converter is an autonomic device that taps the energy from the main input. Therefore, the electronic system of the converter is equipped with a self-supply system with a wide range of the input voltage. The parameters of the converter such as voltage gain, voltages and power ranges can be scalable for prospective applications with the proposed control system.

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Guo, Shi Zhong, Kai Xie, Ying Hao Ye i Xiao Ping Li. "An Ultra Low Voltage Resonant Converter for Thermoelectric Energy Harvesting". Advanced Materials Research 772 (wrzesień 2013): 731–34. http://dx.doi.org/10.4028/www.scientific.net/amr.772.731.

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This paper presents a ultra low voltage resonant converter for thermoelectric energy harvesting.A key challenge in designing energy harvesting system is that thermoelectric generators output a very low voltage (-0.3V~0.3V). Therefore, a power converter is used to boost the output voltage of the energy transducer and transfer energy into an energy buffer for storage. The converter operates from input voltages ranging from-500mV to-60mV and 60mV to 500mV while supplying a 4.2 V DC output. The converter consumes 88μW of quiescent power, delivers up to 1.6 (1.8) mW of output power, and is 65(67)% efficient for a-100mV and 100mV input, respectively.

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32

Do, Hyun Lark. "Non-Isolated High Step-up DC-DC Converter with a Coupled Inductor". Advanced Materials Research 424-425 (styczeń 2012): 1024–27. http://dx.doi.org/10.4028/www.scientific.net/amr.424-425.1024.

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A non-isolated high step-up DC-DC converter with a coupled inductor is proposed in this paper. The proposed converter provides high voltage gain and soft-switching operation of all semiconductor devices. A voltage doubler and a coupled inductor increase the voltage gain. Zero-voltage-switching (ZVS) of all switches and zero-current-switching (ZCS) of all diodes are achieved. Also, the voltages across the semiconductor devices are effectively clamped. Due to the soft-switching operation of all switching devices, the switching loss is significantly reduced and the high efficiency is obtained. The feasibility and performance of the proposed converter were verified on an experimental prototype

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Salyam, Radhika, i Vijaya Margaret. "Source-load-variable voltage regulated cascaded DC/DC converter for a DC microgrid system". International Journal of Electrical and Computer Engineering (IJECE) 13, nr 1 (1.02.2023): 107. http://dx.doi.org/10.11591/ijece.v13i1.pp107-115.

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Solar energy is available abundantly, the utilization of solar energy is developing rapidly and the photovoltaic based direct current (DC) microgrid system design is under demand but the stability of the DC voltage is of most important issue, as the variation of the output DC voltage is a common problem when the load or source voltage varies, hence a regulated DC output voltage converter is proposed. This paper presents source-load-variable (SLV) voltage regulated cascaded DC/DC converter which is used to obtain regulated output voltage of 203.1 V DC at 0.4 duty ratio with ±2% voltage fluctuations for the variation in the input source voltage and ±1.5% voltage fluctuations for the variation in load resistance of the nominal value with lower output voltage ripple and without use of sub circuits. A simulation model of SLV voltage regulated cascaded DC/DC converter in LTspice XVII software environment for the assessment of converter performance at different input source voltages and load resistances are verified.

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Barros, J. Dionísio, Luis Rocha i J. Fernando Silva. "Backstepping Predictive Control of Hybrid Microgrids Interconnected by Neutral Point Clamped Converters". Electronics 10, nr 10 (19.05.2021): 1210. http://dx.doi.org/10.3390/electronics10101210.

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In this work, DC and AC parts of hybrid microgrids are interconnected by a neutral point clamped—NPC converter controlled using a new backstepping predictive (BP) method. The NPC converter is controlled to operate in the DC microgrid voltage control mode or in the AC microgrid power control mode. The novel backstepping predictive controller is designed using the dq state space dynamic model of the NPC converter connected to the hybrid microgrid. The designed BP controller regulates the DC voltage or AC injected power, balances the capacitor voltages, controls the AC currents, and enforces the near unity power factor. Simulation (MATLAB/Simulink) and experimental (laboratory prototype) results show that the converter can regulate the DC voltage in the DC microgrid interconnection point, by adjusting the AC power conversion to compensate variations on the loads or on the distributed renewable energy sources in the DC microgrid. AC currents are sinusoidal with low harmonic distortion. The obtained BP controller is faster at balancing capacitor voltages than PWM (pulse width modulation) control with carrier offset. The fast AC power response allows the converter to be used as a primary frequency regulator of the AC microgrid. This research is appropriate for power and voltage control in hybrid microgrids with renewable energy.

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Ameer Noory, Zainab, i Raaed F. Hassan. "Performance Comparison of Five-Level Active Neutral Point Converter Based on Phase Disposition-PWM and Alternate Phase Opposition Disposition-PWM". ITM Web of Conferences 50 (2022): 03001. http://dx.doi.org/10.1051/itmconf/20225003001.

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The work in this paper presents the performance analysis of the reduced component count converter which is the 5-Level Active Neutral Point Converter (5LANPC). This 5-level converter has been configured by stacking the traditional 3-Level Neutral Point Converter with the Flying Capacitor converter. Two types of control algorithms were considered and compared to explore the performance of the 5LANPC. The first algorithm was based on the Phase-Disposition-Pulse Width Modulation (PD-PWM), while the second one was based on the Alternate Phase Opposition Disposition-Pulse Width Modulation (APOD-PWM). These algorithms are used to determine the required voltage level and according to the required level the state of the switches is selected through a simplified voltage balance algorithm. This voltage balance algorithm deals with the redundant switching states to maintain the voltages of the 5LANPC capacitors at a specified level. The comparison between these two modulation strategies was performed by simulation based on MATLAB/Simulink package. Simulation results showed compelling outcomes involving the two techniques concerning the voltage and current characteristics, as well as the equilibrium in the capacitor voltages. By comparing the simulation results, it was found that the performance of the system is relatively better using the PD-PWM strategy.

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36

Gao, You Hua, Guo Wei Liu, Xiao Ming Liu i Zeng Feng Lai. "Calculation and Analysis of Electrical Field in Valve Side Winding of Converter Transformer". Advanced Materials Research 383-390 (listopad 2011): 4865–70. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.4865.

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The numerical calculation model with compound insulation of transient electrical field is established. The types of voltage applied on the valve side winding of the converter transformer are complicated and the insulation is more prominent. So the simplied calculation model of the valve side winding of the converter transformer is established. The distribution characteristics of electrical field of the valve side winding of the converter transformer is analyzed and electric field in different electrical conductivity and permittivity are calculated under AC high voltage, DC high voltage, AC superimposed DC voltage, polarity reversal voltage. Under all kinds of high voltages, the maximum electric field strength is calculated and analyzed. Some important influence factors for electrical field distribution are also discussed in this paper.

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37

M., Mohamed Samsudeen. "Inductor Coupled Single-Input Multiple-Output (SIMO) DC-DC Converter". International Journal of Advance Research and Innovation 3, nr 1 (2015): 145–53. http://dx.doi.org/10.51976/ijari.311527.

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The aim of this study is to develop a Inductor coupled single input multiple output (SIMO) dc–dc converter. The proposed converter can boost the voltage of a low-voltage input power source to a controllable high-voltage dc bus and middle-voltage output terminals. The high-voltage dc bus can take as the main power for a high-voltage dc load or the front terminal of a dc–ac inverter. Moreover, middle-voltage output terminals can supply powers for individual middle-voltage dc loads or for charging auxiliary power sources (e.g., battery modules). As a result the objectives of high-efficiency power conversion, high step up ratio, and various output voltages with different levels can be obtained.

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38

Kim, Sung-Hun, Hyung-Jun Byun, Junsin Yi i Chung-Yuen Won. "A Bi-Directional Dual-Input Dual-Output Converter for Voltage Balancer in Bipolar DC Microgrid". Energies 15, nr 14 (11.07.2022): 5043. http://dx.doi.org/10.3390/en15145043.

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Bipolar DC microgrids (BDCMGs) have several issues related to the voltage and require numerous converters to supply power to both poles. To solve these issues, a bidirectional dual-input dual-output (DIDO) converter is proposed for the voltage balancer in BDCMG. The DIDO converter has dual-input sources and a dual-output port connected to the grid. Additionally, the DIDO converter simultaneously performs independent bidirectional power control and voltage balancing control. Based on the input voltages, this paper proposes modulation methods for three cases. The modulation method of the second case has a wide operating range and low balancing current ripple without increasing the switching frequency. Moreover, only voltage balancer mode without active input sources is proposed, considering the intermittent source. Therefore, it can operate as a voltage balancer under all conditions. The voltage balancing performance of the three cases was analyzed. Finally, the proposed modulation and control method of the DIDO converter were verified through experimental results.

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Li, Hongzhu, Ling Zhu i Le Wang. "A Double-Boost Converter Based on Coupled Inductance and Magnetic Integration". Active and Passive Electronic Components 2021 (31.12.2021): 1–15. http://dx.doi.org/10.1155/2021/8014620.

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High-voltage gain converter has a high-frequency use in some industrial fields, for instance, the fuel cell system, the photovoltaic system, electric vehicles, and the high-intensity discharge lamp. In order to solve the problem of the low-voltage gain of traditional boost converter, the double-boost converter with coupled inductance and doubled voltage is proposed, which connects the traditional boost converter in parallel. The voltage gain of the converter is further improved by introducing the voltage-doubled unit of the coupled inductance. Moreover, the clamp capacitor can absorb the leakage inductance in the circuit and reduce the voltage stress of the switch. In addition, two coupled inductors are magnetically collected; then, the loss of the core is analyzed under the same gain. The detailed analysis of the proposed converter and a comparison considering other topologies previously published in the literature are also presented in this article. In order to verify the proposed converter performance, a prototype has been built for a power of 200 W, input and output voltages of 12 and 84 V, respectively, and a switching frequency of 50 kHz. Experimental results validate the effectiveness of the theoretical analysis proving the satisfactory converter performance, whose peak efficiency is 95.5%.

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Salih, Firas Abdul-hadi, i Turki Kahawish Hassan. "Capacitor voltages balancing method for buck modular DC/DC converter". International Journal of Power Electronics and Drive Systems (IJPEDS) 13, nr 4 (1.12.2022): 2277. http://dx.doi.org/10.11591/ijpeds.v13.i4.pp2277-2285.

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The most critical problem of the modular DC-DC converter (MDCC) is the voltage balancing of the submodule (SM) capacitors, the MDCC with stepped 2-level modulation has been developed and presents a good solution, however, this type of modulation has many restrictions when there is a wide range of capacitance tolerance of the SM capacitors that results inaccurate capacitor voltages balancing. To solve this problem, this paper discusses a proposed method of capacitor voltage balancing. Compared with stepped 2-level modulation, the voltage balancing method using modified duty cycle modulation offers the merits: i) reduction in output voltage and SM capacitor voltages overshoot during dynamic operation and improvement in the time response of the system and; ii) accurate voltage balancing over wide range of capacitance tolerance of each SM capacitor; and iii) the sorting algorithm replaced with modified duty cycle modulation method for the SM capacitor voltages balancing which reduces the computation burden. The proposed method ensures a stable voltage balancing, improves the time response of the system, and decreases the voltage and current overshoot during the dynamic response compared with prior art of MDCCs, where the stepped 2-level modulation is adopted. An analytical simulation of the MDCC is presented using MATLAB/Simulink to explain the operation.

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41

Toh, Chuen Ling, i P. C. Ooi. "Design a nine-level modular multilevel converter for DC railway electrification system". International Journal of Power Electronics and Drive Systems (IJPEDS) 11, nr 1 (1.03.2020): 151. http://dx.doi.org/10.11591/ijpeds.v11.i1.pp151-159.

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A recuperating converter is highly demanded in traction power substation to deliver the braking energy generated by a traction vehicle. Conventional voltage source inverter had been implemented in the traction power station. However, large ac line filters must be installed to improve the quality of ac voltages and currents. This paper proposes to install a nine-level Modular Multilevel Converter (MMC) as a recuperating converter. The main aim is to eliminate the need of ac line filters while producing good quality of ac voltage and current waveforms. The MMC is designed and modelled using MATLAB/Simulink Simulation tool. A centralized control of balancing all the sub-module capacitor voltage level is proposed with Third Harmonic Voltage Injection Level Shifted Pulse Width Modulation (THVI-LSPWM) technique. The simulation results prove that with the application of MMC, good quality of ac voltages and currents are being produced. The Total Harmonic Distortion indexes are found less than 3.5 % without using any ac line filters in the system. In addition, the classic DC link capacitance has also being eliminated.

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Raveendhra, Dogga, Poojitha Rajana, Kalamchety Srinivasa Ravi Kumar, Praveen Jugge, Ramesh Devarapalli, Eugen Rusu i Hady H. Fayek. "A High-Gain Multiphase Interleaved Differential Capacitor Clamped Boost Converter". Electronics 11, nr 2 (14.01.2022): 264. http://dx.doi.org/10.3390/electronics11020264.

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A step-up for a non-isolated interleaved differential capacitor clamped boost (IDCCB) DC–DC converter is proposed in this manuscript. Because of its ability to produce high voltage gains, it is used in high-power applications. This converter’s modelling and control design are applicable to any number of phases. A six-phase interleaved differential capacitor clamped boost prototype is tested in this work, with an input voltage of 60 V, an output voltage of 360 V, and a nominal output power of 2.2 kW. The components of the converter are placed and controlled in such a way that the output voltage is the sum of the two capacitor voltages and the input voltage, which is two times higher than the supply voltage when compared to a conventional interleaved differential dual-boost converter. This converter reduces the stress on the capacitor with reference to the conventional interleaved differential boost converter for the same conversion gain. This prototype is considered and the developed approach is applied, after which the experimental results are obtained. This converter has potential for application in areas such as renewable energy conversion and electric vehicles.

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Huang, Yue Hua, Li Hua Hu, Jia Wei Li i Hai Fan Xia. "Analysis and Countermeasures of Value Side Bushing Fault of Converter Transformer in Gezhouba to Nanqiao HVDC Transmission Project". Applied Mechanics and Materials 672-674 (październik 2014): 870–76. http://dx.doi.org/10.4028/www.scientific.net/amm.672-674.870.

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Converter transformer is one of the most important equipments of UHVDC power transmission system, its faults directly affects the safe and stable operation of DC system. The valve winding of converter transformer needs to withstand the voltage that consist of DC voltage and serious distortion of AC voltages (harmonic bound) which are similar to the AC sine waveform compound voltage, so in the design and manufacture of the valve side of converter transformer, bushing is much more complex and difficult than alternating current casing.Valve bushing is weak spot of converter transformer insulation. Through the anatomy of failure bushing, the reason of bushing failure is analyzed. Without changing body size of the converter transformer, the bushing of new structure is developed and the old bushing is replaced to improve the reliability of equipment operation.

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Hu, Han Mei, Ya Jing Shi, Yan Hua Zhang i Ya Ling Fu. "Study on Power Supply of the Feeder Terminal Equipment". Applied Mechanics and Materials 672-674 (październik 2014): 914–19. http://dx.doi.org/10.4028/www.scientific.net/amm.672-674.914.

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Converter transformer is one of the most important equipments of UHVDC power transmission system, its faults directly affects the safe and stable operation of DC system. The valve winding of converter transformer needs to withstand the voltage that consist of DC voltage and serious distortion of AC voltages (harmonic bound) which are similar to the AC sine waveform compound voltage, so in the design and manufacture of the valve side of converter transformer, bushing is much more complex and difficult than alternating current casing. Valve bushing is weak spot of converter transformer insulation. Through the anatomy of failure bushing, the reason of bushing failure is analyzed. Without changing body size of the converter transformer, the bushing of new structure is developed and the old bushing is replaced to improve the reliability of equipment operation.

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45

Beriber, D., A. Talha i M. Boucherit. "Stabilization of multi DC bus link voltages of multilevel NPC VSI. Application to double stator induction motors". Archives of Control Sciences 22, nr 1 (1.01.2012): 107–20. http://dx.doi.org/10.2478/v10170-011-0015-1.

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Stabilization of multi DC bus link voltages of multilevel NPC VSI. Application to double stator induction motors Voltage source multilevel inverters have become very attractive for power industries in power electronics applications during last years. The main purposes of studying multilevel inverters are the generation of output voltage signals with low harmonic distortion and reduction of switching frequency. An important issue of the multilevel inverter is the capacitor voltage-balancing problem. The unbalance of different DC voltage sources of multilevel neutral point clamped (NPC) voltage source inverter (VSI) constitutes the major limitation for the use of this new power converter. In this paper, we present study on the stability problem of the input DC voltages of the three-level Neutral Point Clamping (NPC) voltage source inverter (VSI). This inverter is useful for application in high voltage and high power area. In the first part, we remind the model of double stator induction motors (DSIM). Then, we develop control models of this inverter using the connection functions of the semi-conductors. We propose a Pulse Width Modulation (PWM) strategy to control this converter. The inverter is fed by constant input DC voltages. In the last part, we study the stability problem of the input DC voltages of the inverter. A cascade constituted by two three-level PWM rectifiers - two three-level NPC VSI - DSIM is discussed. The results obtained show that the input DC voltages of the inverters are not stable. To solve this problem, we propose to use a half clamping bridge. This solution is very promising in order to stabilize the input DC voltages of this converters.

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Khawarizmi, Ahmad, i Lini Lee. "Design of a High Efficiency Switched-Capacitor (SC) DC-DC Converter". F1000Research 11 (19.05.2022): 541. http://dx.doi.org/10.12688/f1000research.73393.1.

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Portable electronic devices and miniaturized devices would require different operating voltages and load current which can be powered through DC-DC converter. In this paper, the proposed converter is based on a multiple topology of DC-DC converter circuit for more than one voltage gain regions using switched capacitor (SC) method. The post layout implementation showed that the high efficiency networks are achieved with low voltage drop and low internal resistance. The efficiency of 95% and 85% are shown, on the networks in the 1/2 and 2/3 voltage gain regions respectively, proving that this method is advantageous compared to other literature papers.

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47

Sladić, Saša, Srđan Skok i David Nedeljković. "Efficiency Considerations and Application Limits of Single-Phase Active Power Filter with Converters for Photoenergy Applications". International Journal of Photoenergy 2011 (2011): 1–8. http://dx.doi.org/10.1155/2011/643912.

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A new way of connecting PV sources to adaptive voltage active power filter (AV APF) has been compared with classic approach including active power filter (APF). In standard active power filter applications a relatively high DC link voltage (500 V or even more) with a buck converter or lower voltage (approx. 100 V) with boost converter can be used. These two converters appear also in adaptive voltage circuit of AV APF, but in this case it is possible to achieve many different connections of DC source. Benefit of this approach is that the same circuit is used for improving switching conditions in APF and for connection of solar cells. It appears that these two functions support each other and a large variety of DC voltages and currents can be connected to AC mains. Experimental results confirm expectations of increased energy transfer from additional DC source to network, especially for DC voltages being lower than DC link voltage.

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Higuchi, Kohji, Eiji Takegami, Kazushi Nakano, Tatsuyoshi Kajikawa, Satoshi Tomioka i Kosin Chamnongthai. "Digital Robust Control for DC-DC Converter with Second-Order Differential Characteristics". ECTI Transactions on Electrical Engineering, Electronics, and Communications 7, nr 2 (19.12.2008): 72–80. http://dx.doi.org/10.37936/ecti-eec.200972.171900.

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Robust DC-DC converter which can covers extensive load changes and also input voltage changes with one controller is needed. The demand to suppressing output voltage changes becomes still severer. We proposed an approximate 2DOF digital controller which realizes the startup response and dynamic load response independently. The controller makes the control bandwidth wider, and at the same time makes a variation of the output voltage small at sudden changes of loads and input voltages. In this paper, a new approximate 2DOF digital control system with additional zeros is proposed. Using additinal zeros second-order differential transfer characteristics between equivalent disturbances and an output voltage are realized. Therefore the new controller makes variations of the output voltage smalerl at sudden changes of loads and input voltages. This controller is actually implemented on a DSP and is connected to a DC-DC converter. Experimental studies demonstrate that this type of digital controller can satisfy given severe specifications.

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Liang, Chonggan, Xinran Guo, Hongxing Wang, Qi Xu, Shi Liu, Yi Yang i Zhigang Liu. "A hybrid full-bridge three-level DC-DC converter with crossing auxiliary capacitors". Journal of Physics: Conference Series 2360, nr 1 (1.11.2022): 012026. http://dx.doi.org/10.1088/1742-6596/2360/1/012026.

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This paper presents a high-power medium-frequency hybrid full-bridge (FB) three-level (TL) DC-DC converter with crossing auxiliary capacitors. In this converter, two auxiliary capacitors are deployed between phases a and b, replacing the flying capacitor. The converter’s three-level leg switches are with low voltage stress, while the two-level leg switches are with high voltage stress. The topology and modulation method, as well as the switching characteristics of the hybrid FBTL DC-DC converter with crossing auxiliary capacitors are described. The feasibility and performance of the above-mentioned converter is validated by a laboratory prototype. Based on the mechanism analysis and experiments, the zero-voltage switching (ZVS) and zero-switching loss (ZSL) of power switches, self-balance of the clamped capacitors voltages, and the voltage self-balance of the switches in the three-level leg can be achieved.

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Mahafzah, Khaled A., i Hana A. Rababah. "A novel step-up/step-down DC-DC converter based on flyback and SEPIC topologies with improved voltage gain". International Journal of Power Electronics and Drive Systems (IJPEDS) 14, nr 2 (1.06.2023): 898. http://dx.doi.org/10.11591/ijpeds.v14.i2.pp898-908.

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A novel step-up/step-down DC-DC converter with improved voltage gain characteristics is suggested in this paper. The proposed converter combines flyback and single-ended primary inductance converter (SEPIC) converters. The voltage control loop design is simplified due to the use of only a single controlled switch. It has been discussed how switch duty cycle affects voltage gain. This relationship demonstrates that the proposed converter voltage gain is improved compared with flyback and SEPIC converters. However, compared to flyback and SEPIC converters, it has a higher voltage gain at any given duty cycle. The proposed converter operation is thoroughly discussed, the associated equations are derived, and its parameters are expertly designed. Moreover, it is designed to supply a DC load of 2.5 kW, 500 V, and 5 A. The proposed converter efficiency exceeds 84% under rated load conditions. Additionally, it is also presented as an adapter for electric vehicles. The waveforms associated with the simulation of the converter across the universal line voltage of 110-260 Vrms are shown. At both line voltages, the total harmonics distortions (THDs) of the line current are 17.12% and 27.26%, respectively. MATLAB/Simulink is utilized for validation in order to validate the topology for different applications.

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