EPE Association: EPE 2005 - Topic 12-3a

EPE 2005 - Topic 12-3a - DS: Power Supplies
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   20 MW DC THYRISTOR POWER CONVERTER WITH EXTREMELY LOW RIPPLE AND DRIFT FOR HIGH MAGNETIC FIELD RESEARCH
By COLIJN Albert; LIESHOUT VAN Lou; WOLF Renso [View]
[Download]

Abstract: For research on the behaviour of matter inside high magnetic fields (33 T continuous to 80 T pulsed) dissipative magnets are used and high DC power (2 x 10 MW) is required. Because the behaviour of a material can change completely, even at one hundredth percent of field increase, the magnet power supply must have a very high short time current stability (2 ppm of nominal current) and extremely low current ripple (< 15 ppm).Two 10 MW water-cooled thyristor converters, with passive and active filtering, operating in single or parallel mode, are constructed and put in operation, fulfilling all demands. The two 10 MW thyristor converters can also be operated in series delivering 20 kA at 1000V in pulsed mode (typically 1s), facilitating operation with a two-coils arrangement (coil-in/coil-ex).The power system will be described and design choices explained. The configuration of the control loops will be discussed and some test results presented.

   A Current Compensation Circuit for VRM in the Sudden Change of the Load
By ISHIZUKA Yoichi; MATSUO Hirofumi; UENO Masao; ITOH Koichi [View]
[Download]

Abstract: A new current-compensation circuit system for VRM is proposed. The proposed circuit consists of MOSFETs, resistors and capacitors without any discrete magnetic devices. It works during only term of transient response and total power loss is very small. From the simulation result, it is revealed that the output voltage of the VRM has fitted in 5 \% of 1.5 V at the load change between 1 A and 50 A. And from the observation result, it is revealed that the descent width of output voltage of VRM has improved about 100 mV of 1.5 V at the load change from 1 A to 10 A.

   A Double Step-Down Two-Phase Buck Converter for VRM
By TERUKAZU Sato; NAKANO Tadao; HARADA Koosuke; TAKASHI Nabeshima; NISHIJIMA Kimihiro [View]
[Download]

Abstract: In order to provide the power to the microprocessor, a novel two-phase converter with the large step down conversion capability is presented. The voltage conversion ratio of this converter is given as Eo/Ei = D/2. The switching loss and the output voltage ripple are also reduced. Moreover the current unbalance between two inductors in each phase is removed automatically without any current sensing means.

   A Mixed-Signal Control for VRM applications
By MATTAVELLI Paolo; LEE Fred C.; GARCEA Giovanni; LEE Kisun [View]
[Download]

Abstract: This paper proposes a mixed-signal control for Voltage Regulated Modules (VRMs), which is based on a digital voltage loop and a peak-modulator digitally controlled by a low-resolution Digital-to-Analog Converter (DAC). Improvement in the dynamic response and elimination of static quantization effects are obtained performing the peak-modulation on a weighted sum of output voltage and inductor current. The control features good dynamic performance, fixed switching frequency, small quantization effects, and low-complexity. Simulation and experimental results on a three-phase interleaved synchronous buck VRM confirm the performance of the proposed solution.

   A New Voltage Sag Compensator with a Gradationally Controlled Voltage Inverter
By OKADA Joji; YAMADA Masaki; ISHII Yasuhiro; IWATA Akihiko; HATAKEYAMA Yoshihiro [View]
[Download]

Abstract: A new voltage sag compensator with a gradationally controlled voltage inverter which exceeds SEMI F47 standard has been developed. It consists of a gradationally controlled voltage inverter in which inverters are connected in series and are charged at different voltages to each other, and which outputs the sum of each output voltage. This system is small and with an extremely low loss.

   A NEW ZERO-VOLTAGE SWITCHING HF LINK SINGLE-PHASE UPS SYSTEM WITH INPUT PFC
By SIBZALI Ahmed; ABDELHAMID Tamer Helmy [View]
[Download]

Abstract: The loss of power supply reduces productivity and loses both revenue and, even more important, credibility. Power outages are one of the serious threats to an on-line system, which contains a considerable number of critical equipment that need to be operating all the time. However, maintaining commercial power and, at the same time, obtaining a clean power supply can be achieved with the help of a UPS system. This paper presents a new single-phase on-line UPS system configuration that enjoys the following advantages; constant frequency operation, zero-voltage switching, and input power factor correction. The principle of operation, different modes of operation, switching strategy, and control circuit are presented. The simulation of the proposed system is carried out using Matlab/Simulink, where components’ voltages and currents, and harmonic spectra are presented and discussed. Experimental results obtained from a 500W prototype are also presented to verify the performance of the proposed configuration.

   A Single Stage Single Switch Flyback Converter with Synchronous Rectifier
By LIM I; RYU H; KIM Bongsuck; KWON Bon; KWON Jun [View]
[Download]

Abstract: A single-stage single-switch flyback converter with synchronous rectifier is proposed. The proposed single-stage single-switch technique meets the IEC1000-3-2 harmonic requirements. The proposed SR is the voltage driven synchronous rectifier (VDSR) which operates depending on the voltage drop across the drain and source of the MOSFET. Experimental results for the 85W (12V/7.1A) proposed converter are shown.

   A Transformer Comparison for Three-Phase Single Active Bridges
By JACOBS Joep; THOeMMES Marco; DE DONCKER Rik W. [View]
[Download]

Abstract: This paper investigates the impact of the transformer configuration on the performance of the three-phase single active bridge. The investigated configurations are a why-why connected transformer, a why-delta connected transformer and a delta-why connected transformer.The converter's operation is described in detail for all transformer configurations. Voltage and current waveforms of all converter components are derived analytically. Furthermore, current and voltage stresses of the converter components are compared and the advantages and disadvantages of the different transformer configurations are discussed. The comparison shows large difference of the voltage and current stresses for the different configurations resulting in a large deviations in power density and efficiency. Experimental results taken from a 5 kW / 80 kHz laboratory breadboard three-phase single active bridge verify the analysis.

   Advanced High Frequency Transformer Linked Soft Switching PWM DC-DC Power Converter with Utility AC Dual Voltage Modes for Low Voltage and Large Current Appl
By DOI Toshimitsu; MORIMOTO Keiki; AHMED Nabil A.; NAKAOKA Mutsuo; LEE Hyu; MANABE Haruhiko [View]
[Download]

Abstract: This paper presents two new circuit topologies of dc bus line series active snubber assisted soft switching PWM full-bridge dc-dc power converter acceptable for either utility ac 200V-rms or ac 400V-rms input voltage source. One of proposed power converters is composed of a typical voltage source full-bridge high frequency PWM inverter using dc bus line side series switching devices with the aid of a parallel capacitive lossless snubber. All the active power switches in the full-bridge arms and dc bus line can achieve ZCS turn-on and ZVS turn-off commutation operation and consequently the total turn-off switching losses can be significantly reduced. As a result, a high switching frequency for used IGBTs can be actually realized more than about 20 kHz. It is proved that the more the switching frequency of full-bridge inverter increases, the more soft switching PWM dc-dc power converter with a high frequency transformer link has remarkable advantages for its power conversion efficiency and power density as compared with the conventional hard switching PWM inverter type dc-dc converter. The effectiveness of this new converter topology is proved for low voltage and large current dc-dc power supplies as arc welding machine from a practical point of view.

   AN AUXILIARY POWER SUPPLY BASED ON THE PHASE VOLTAGE RIPPLE EMPLOYED IN A MICRO INVERTER FOR FEEDING THREE PHASE TESLA INDUCTION MOTOR
By GRBOVIC Petar; VUKOSAVIC Slobodan [View]
[Download]

Abstract: This paper describes an auxiliary power supply employed to feed the control unit and gate drivers in a three-phase PWM micro inverter. The micro inverter feeds three-phase Tesla induction motor as mechanical actuator in small industrial water pumps. The proposed auxiliary power supply is based on a resonant serial half wave rectifier supplied from an output of the inverter. The rectifier provides output voltage of approximately 15 V at 30 mA load current. The analytical analysis was experimentally verified on the micro inverter TRISTALAN150

   ANALYSIS AND CONTROL ASPECTS OF HARMONIC DISTORTION IN THE FRONT-END THREE-PHASE FOUR-WIRE PWM BOOST RECTIFIER
By WOLF Henrik; MOHAN Sumitha; BRIEST Ralf; GUELDNER Henry [View]
[Download]

Abstract: There are several aspects to be considered in connecting high frequency switching converters to the grid, as for example, in all front-end rectifiers used in UPS, adjustable speed drives etc. High frequency switching distortions due to modulation must be minimized as much as possible from being injected into the grid and the system must be able to reject low frequency harmonic distortions from the grid or the load end. Analysis of the harmonic distortions in the LCL-filter based, 3-Dimensional Space Vector Modulated split-capacitor boost rectifier is done for harmonics at both high and low -frequency ranges. In both these frequency ranges, the THD of the input current must be maintained within specific limits and also a high dynamic performance of the system ensured.

   CONTROL-ORIENTED DYNAMIC MODEL OF SINGLE MAGNETIC PUSH-PULL FORWARD CONVERTER WITH BUILT-IN INPUT FILTER
By CASTILLA Miguel; ALENTORN Alberto; SOSA Jorge; CRUZ Juan; MATAS Jose; MIRET Jaume [View]
[Download]

Abstract: This paper presents a complete averaged dynamic model for the single-magnetic push-pull forward converter, including parasitic elements. The single magnetic push-pull forward converter is a suitable topology to supply high-performance microprocessors from a high-voltage distribution bus. A good agreement between the waveforms generated by the converter topology (with specific models supplied by manufacturers) and the averaged model using PSPICE is observed. The proposed averaged model describes accurately the low-frequency behaviour and constitutes a necessary initial step toward the conception of control design strategies for this switching converter. The averaged dynamic model is simple and has a reduced order, so therefore it is an appropriate tool to predict transient and steady-state responses, to gain insight about the power processing mechanism, and to evaluate control architectures in a given operating region. The model simulation of the push-pull forward converter constitutes a necessary initial step toward the conception of control design strategies for this promising switching converter.

   Development of Economical UPS System Having Active Filter Across DC-bus
By HITOSHI Haga; KIYOSHI Ohishi; ITARU Ando [View]
[Download]

Abstract: This paper proposes an economical single-phase flywheel uninterruptible power supply (UPS) having active filter across the dc-bus. The proposed UPS consists of diode rectifier, inverters, LC filter and flywheel energy storage unit, and it has many features such as low production cost, long life of the system. The proposed UPS has the active filter ability across the dc-bus, which realizes unity power factor operation without both PWM rectifier and bulky electrolytic capacitor. A three-phase inverter regulates PM Motor/generator speed with flywheel and compensates the harmonic input current to the sinusoidal input current. The dc-bus line has the absolute waveform of input voltage. The output voltage obtains the sinusoidal waveform by using synchronous switched single-phase inverter. The simulation results point out that the proposed economical flywheel UPS system has the desired sinusoidal input current and output voltage. Moreover, the proposed system realizes maintenance free system, small size, long life and very low production cost.

   Experimental Verification of the Thermal Droop Load Sharing Technique
By ANDERSEN Michael; NESGAARD Carsten [View]
[Download]

Abstract: As the demand for reliable power systems comprised of parallel-connected converter units continue to increase the need for optimized, yet simple, load sharing techniques increase accordingly.This paper examines the traditional series droop resistor technique and its reliability optimized counterpart - the thermal droop load sharing. The former technique ensures an approximate load sharing among the individual converters by distributing an equal current throughout the system while the latter technique uses temperature information to adjust the individual converter currents, henceintentionally creating an unequal load sharing.Following an introduction to the thermal droop load sharing technique, a set of measurements of both techniques is presented. These verify that the thermal droop load sharing technique has a positive impact on the overall system.

   Fully digital regulated high-precision power supply
By HEIDBROOK Niels [View]
[Download]

Abstract: This paper was unfortunatelly not uploaded on time to be on the CD-ROM. EPE Association will try to make the paper available from http://epe2005.cborg.net/programme.html until 31/12/2005 and later fromthe EPE Association website (members' area).

   Zero Ripple DC-DC Converter
By SEKINE Masaoki; NISHIJIMA Kimihiro; NAKANO Tadao; NABESHIMA Takashi; SATO Terukazu [View]
[Download]

Abstract: This paper presents a novel dc-to-dc converter with an auxiliary circuit that completely cancels the ripple current in the output capacitor. Operation principles of the proposed circuit are described, and steady state and small signal ac characteristics are analyzed and confirmed by experiments. Furthermore, a compensation circuit to improve dynamic characteristic is proposed and confirmed by experiments.

EPE 2005 - Topic 12-3a - DS: Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2005 - Conference > EPE 2005 - Topic 12: POWER SUPPLIES > EPE 2005 - Topic 12-3a - DS: Power Supplies
	[return to parent folder]

	20 MW DC THYRISTOR POWER CONVERTER WITH EXTREMELY LOW RIPPLE AND DRIFT FOR HIGH MAGNETIC FIELD RESEARCH By COLIJN Albert; LIESHOUT VAN Lou; WOLF Renso	[View] [Download]
Abstract: For research on the behaviour of matter inside high magnetic fields (33 T continuous to 80 T pulsed) dissipative magnets are used and high DC power (2 x 10 MW) is required. Because the behaviour of a material can change completely, even at one hundredth percent of field increase, the magnet power supply must have a very high short time current stability (2 ppm of nominal current) and extremely low current ripple (< 15 ppm).Two 10 MW water-cooled thyristor converters, with passive and active filtering, operating in single or parallel mode, are constructed and put in operation, fulfilling all demands. The two 10 MW thyristor converters can also be operated in series delivering 20 kA at 1000V in pulsed mode (typically 1s), facilitating operation with a two-coils arrangement (coil-in/coil-ex).The power system will be described and design choices explained. The configuration of the control loops will be discussed and some test results presented.

	A Current Compensation Circuit for VRM in the Sudden Change of the Load By ISHIZUKA Yoichi; MATSUO Hirofumi; UENO Masao; ITOH Koichi	[View] [Download]
Abstract: A new current-compensation circuit system for VRM is proposed. The proposed circuit consists of MOSFETs, resistors and capacitors without any discrete magnetic devices. It works during only term of transient response and total power loss is very small. From the simulation result, it is revealed that the output voltage of the VRM has fitted in 5 \% of 1.5 V at the load change between 1 A and 50 A. And from the observation result, it is revealed that the descent width of output voltage of VRM has improved about 100 mV of 1.5 V at the load change from 1 A to 10 A.

	A Double Step-Down Two-Phase Buck Converter for VRM By TERUKAZU Sato; NAKANO Tadao; HARADA Koosuke; TAKASHI Nabeshima; NISHIJIMA Kimihiro	[View] [Download]
Abstract: In order to provide the power to the microprocessor, a novel two-phase converter with the large step down conversion capability is presented. The voltage conversion ratio of this converter is given as Eo/Ei = D/2. The switching loss and the output voltage ripple are also reduced. Moreover the current unbalance between two inductors in each phase is removed automatically without any current sensing means.

	A Mixed-Signal Control for VRM applications By MATTAVELLI Paolo; LEE Fred C.; GARCEA Giovanni; LEE Kisun	[View] [Download]
Abstract: This paper proposes a mixed-signal control for Voltage Regulated Modules (VRMs), which is based on a digital voltage loop and a peak-modulator digitally controlled by a low-resolution Digital-to-Analog Converter (DAC). Improvement in the dynamic response and elimination of static quantization effects are obtained performing the peak-modulation on a weighted sum of output voltage and inductor current. The control features good dynamic performance, fixed switching frequency, small quantization effects, and low-complexity. Simulation and experimental results on a three-phase interleaved synchronous buck VRM confirm the performance of the proposed solution.

	A New Voltage Sag Compensator with a Gradationally Controlled Voltage Inverter By OKADA Joji; YAMADA Masaki; ISHII Yasuhiro; IWATA Akihiko; HATAKEYAMA Yoshihiro	[View] [Download]
Abstract: A new voltage sag compensator with a gradationally controlled voltage inverter which exceeds SEMI F47 standard has been developed. It consists of a gradationally controlled voltage inverter in which inverters are connected in series and are charged at different voltages to each other, and which outputs the sum of each output voltage. This system is small and with an extremely low loss.

	A NEW ZERO-VOLTAGE SWITCHING HF LINK SINGLE-PHASE UPS SYSTEM WITH INPUT PFC By SIBZALI Ahmed; ABDELHAMID Tamer Helmy	[View] [Download]
Abstract: The loss of power supply reduces productivity and loses both revenue and, even more important, credibility. Power outages are one of the serious threats to an on-line system, which contains a considerable number of critical equipment that need to be operating all the time. However, maintaining commercial power and, at the same time, obtaining a clean power supply can be achieved with the help of a UPS system. This paper presents a new single-phase on-line UPS system configuration that enjoys the following advantages; constant frequency operation, zero-voltage switching, and input power factor correction. The principle of operation, different modes of operation, switching strategy, and control circuit are presented. The simulation of the proposed system is carried out using Matlab/Simulink, where components’ voltages and currents, and harmonic spectra are presented and discussed. Experimental results obtained from a 500W prototype are also presented to verify the performance of the proposed configuration.

	A Single Stage Single Switch Flyback Converter with Synchronous Rectifier By LIM I; RYU H; KIM Bongsuck; KWON Bon; KWON Jun	[View] [Download]
Abstract: A single-stage single-switch flyback converter with synchronous rectifier is proposed. The proposed single-stage single-switch technique meets the IEC1000-3-2 harmonic requirements. The proposed SR is the voltage driven synchronous rectifier (VDSR) which operates depending on the voltage drop across the drain and source of the MOSFET. Experimental results for the 85W (12V/7.1A) proposed converter are shown.

	A Transformer Comparison for Three-Phase Single Active Bridges By JACOBS Joep; THOeMMES Marco; DE DONCKER Rik W.	[View] [Download]
Abstract: This paper investigates the impact of the transformer configuration on the performance of the three-phase single active bridge. The investigated configurations are a why-why connected transformer, a why-delta connected transformer and a delta-why connected transformer.The converter's operation is described in detail for all transformer configurations. Voltage and current waveforms of all converter components are derived analytically. Furthermore, current and voltage stresses of the converter components are compared and the advantages and disadvantages of the different transformer configurations are discussed. The comparison shows large difference of the voltage and current stresses for the different configurations resulting in a large deviations in power density and efficiency. Experimental results taken from a 5 kW / 80 kHz laboratory breadboard three-phase single active bridge verify the analysis.

	Advanced High Frequency Transformer Linked Soft Switching PWM DC-DC Power Converter with Utility AC Dual Voltage Modes for Low Voltage and Large Current Appl By DOI Toshimitsu; MORIMOTO Keiki; AHMED Nabil A.; NAKAOKA Mutsuo; LEE Hyu; MANABE Haruhiko	[View] [Download]
Abstract: This paper presents two new circuit topologies of dc bus line series active snubber assisted soft switching PWM full-bridge dc-dc power converter acceptable for either utility ac 200V-rms or ac 400V-rms input voltage source. One of proposed power converters is composed of a typical voltage source full-bridge high frequency PWM inverter using dc bus line side series switching devices with the aid of a parallel capacitive lossless snubber. All the active power switches in the full-bridge arms and dc bus line can achieve ZCS turn-on and ZVS turn-off commutation operation and consequently the total turn-off switching losses can be significantly reduced. As a result, a high switching frequency for used IGBTs can be actually realized more than about 20 kHz. It is proved that the more the switching frequency of full-bridge inverter increases, the more soft switching PWM dc-dc power converter with a high frequency transformer link has remarkable advantages for its power conversion efficiency and power density as compared with the conventional hard switching PWM inverter type dc-dc converter. The effectiveness of this new converter topology is proved for low voltage and large current dc-dc power supplies as arc welding machine from a practical point of view.

	AN AUXILIARY POWER SUPPLY BASED ON THE PHASE VOLTAGE RIPPLE EMPLOYED IN A MICRO INVERTER FOR FEEDING THREE PHASE TESLA INDUCTION MOTOR By GRBOVIC Petar; VUKOSAVIC Slobodan	[View] [Download]
Abstract: This paper describes an auxiliary power supply employed to feed the control unit and gate drivers in a three-phase PWM micro inverter. The micro inverter feeds three-phase Tesla induction motor as mechanical actuator in small industrial water pumps. The proposed auxiliary power supply is based on a resonant serial half wave rectifier supplied from an output of the inverter. The rectifier provides output voltage of approximately 15 V at 30 mA load current. The analytical analysis was experimentally verified on the micro inverter TRISTALAN150

	ANALYSIS AND CONTROL ASPECTS OF HARMONIC DISTORTION IN THE FRONT-END THREE-PHASE FOUR-WIRE PWM BOOST RECTIFIER By WOLF Henrik; MOHAN Sumitha; BRIEST Ralf; GUELDNER Henry	[View] [Download]
Abstract: There are several aspects to be considered in connecting high frequency switching converters to the grid, as for example, in all front-end rectifiers used in UPS, adjustable speed drives etc. High frequency switching distortions due to modulation must be minimized as much as possible from being injected into the grid and the system must be able to reject low frequency harmonic distortions from the grid or the load end. Analysis of the harmonic distortions in the LCL-filter based, 3-Dimensional Space Vector Modulated split-capacitor boost rectifier is done for harmonics at both high and low -frequency ranges. In both these frequency ranges, the THD of the input current must be maintained within specific limits and also a high dynamic performance of the system ensured.

	CONTROL-ORIENTED DYNAMIC MODEL OF SINGLE MAGNETIC PUSH-PULL FORWARD CONVERTER WITH BUILT-IN INPUT FILTER By CASTILLA Miguel; ALENTORN Alberto; SOSA Jorge; CRUZ Juan; MATAS Jose; MIRET Jaume	[View] [Download]
Abstract: This paper presents a complete averaged dynamic model for the single-magnetic push-pull forward converter, including parasitic elements. The single magnetic push-pull forward converter is a suitable topology to supply high-performance microprocessors from a high-voltage distribution bus. A good agreement between the waveforms generated by the converter topology (with specific models supplied by manufacturers) and the averaged model using PSPICE is observed. The proposed averaged model describes accurately the low-frequency behaviour and constitutes a necessary initial step toward the conception of control design strategies for this switching converter. The averaged dynamic model is simple and has a reduced order, so therefore it is an appropriate tool to predict transient and steady-state responses, to gain insight about the power processing mechanism, and to evaluate control architectures in a given operating region. The model simulation of the push-pull forward converter constitutes a necessary initial step toward the conception of control design strategies for this promising switching converter.

	Development of Economical UPS System Having Active Filter Across DC-bus By HITOSHI Haga; KIYOSHI Ohishi; ITARU Ando	[View] [Download]
Abstract: This paper proposes an economical single-phase flywheel uninterruptible power supply (UPS) having active filter across the dc-bus. The proposed UPS consists of diode rectifier, inverters, LC filter and flywheel energy storage unit, and it has many features such as low production cost, long life of the system. The proposed UPS has the active filter ability across the dc-bus, which realizes unity power factor operation without both PWM rectifier and bulky electrolytic capacitor. A three-phase inverter regulates PM Motor/generator speed with flywheel and compensates the harmonic input current to the sinusoidal input current. The dc-bus line has the absolute waveform of input voltage. The output voltage obtains the sinusoidal waveform by using synchronous switched single-phase inverter. The simulation results point out that the proposed economical flywheel UPS system has the desired sinusoidal input current and output voltage. Moreover, the proposed system realizes maintenance free system, small size, long life and very low production cost.

	Experimental Verification of the Thermal Droop Load Sharing Technique By ANDERSEN Michael; NESGAARD Carsten	[View] [Download]
Abstract: As the demand for reliable power systems comprised of parallel-connected converter units continue to increase the need for optimized, yet simple, load sharing techniques increase accordingly.This paper examines the traditional series droop resistor technique and its reliability optimized counterpart - the thermal droop load sharing. The former technique ensures an approximate load sharing among the individual converters by distributing an equal current throughout the system while the latter technique uses temperature information to adjust the individual converter currents, henceintentionally creating an unequal load sharing.Following an introduction to the thermal droop load sharing technique, a set of measurements of both techniques is presented. These verify that the thermal droop load sharing technique has a positive impact on the overall system.

	Fully digital regulated high-precision power supply By HEIDBROOK Niels	[View] [Download]
Abstract: This paper was unfortunatelly not uploaded on time to be on the CD-ROM. EPE Association will try to make the paper available from http://epe2005.cborg.net/programme.html until 31/12/2005 and later fromthe EPE Association website (members' area).

	Zero Ripple DC-DC Converter By SEKINE Masaoki; NISHIJIMA Kimihiro; NAKANO Tadao; NABESHIMA Takashi; SATO Terukazu	[View] [Download]
Abstract: This paper presents a novel dc-to-dc converter with an auxiliary circuit that completely cancels the ripple current in the output capacitor. Operation principles of the proposed circuit are described, and steady state and small signal ac characteristics are analyzed and confirmed by experiments. Furthermore, a compensation circuit to improve dynamic characteristic is proposed and confirmed by experiments.