Soft-switching PWM DC-DC Converter Research Articles

High-Frequency Soft-Switching PWM DC-DC Converter with Active Output Rectifier Operating as a Current Source for Arc Welding Applications

This paper introduces a high-frequency soft-switching pulse-width modulation DC-DC power converter with secondary active rectifier tested as a DC current source for arc welding applications. The soft-switching DC-DC converter consists of a high-frequency full-bridge inverter, high-frequency power transformer, and a controlled output rectifier with new secondary energy recovery turn-off snubber. Circulating currents in the converter are reduced by using active rectifier, and RMS values of the currents in primary and secondary switches are decreased by utilizing a novel control algorithm. The experimental results of a 4.5 kW DC-DC converter working at switching frequency of 100 kHz are presented.

A high-efficiency DC-DC converter with LC resonant in the load-side of HFT and voltage doubler for solar PV systems

This paper presents the implementation of a prototype phase-shift soft-switching full-bridge PWM DC-DC power converter isolated by a high-frequency transformer (HFT). This circuit topology is based on a new concept of series resonant principle in the secondary side. The step-up HFT and the voltage doubler rectifier make this circuit suitable for low-voltage renewable sources such as fuel cell or PV applications. Meanwhile, all semiconductor switches can achieve zero-voltage soft-switching (ZVS) with the assistance of transformer leakage inductances and lossless capacitive snubbers. The new contribution of this work is that the passive semiconductor switches (diodes) on the secondary side can also perform ZVS and zero-current switching (ZCS) transitions with the assistance of voltage doubler capacitance. The theory of operation and the experimental setup of the proposed circuit with a rated output of 5 kW are presented and discussed. A comparison between simulation and experimental results is explored and illustrated.

A high-efficiency DC-DC converter with LC resonant in the load-side of HFT and voltage doubler for solar PV systems

This paper presents the implementation of a prototype phase-shift soft-switching full-bridge PWM DC-DC power converter isolated by a high-frequency transformer (HFT). This circuit topology is based on a new concept of series resonant principle in the secondary side. The step-up HFT and the voltage doubler rectifier make this circuit suitable for low-voltage renewable sources such as fuel cell or PV applications. Meanwhile, all semiconductor switches can achieve zero-voltage soft-switching (ZVS) with the assistance of transformer leakage inductances and lossless capacitive snubbers. The new contribution of this work is that the passive semiconductor switches (diodes) on the secondary side can also perform ZVS and zero-current switching (ZCS) transitions with the assistance of voltage doubler capacitance. The theory of operation and the experimental setup of the proposed circuit with a rated output of 5 kW are presented and discussed. A comparison between simulation and experimental results is explored and illustrated.

패시브 공진 스너버를 이용한 플라이백형 ZVS PWM DC-DC 컨버터의 특성해석

In this paper, a high frequency flyback type zero voltage soft switching PWM DC-DC converter using IGBTs is proposed. Effective applications for this power converter can be found in auxiliary power supplies of rolling stock transportation and electric vehicles. This power converter is basically composed of active power switches and a flyback high frequency transformer. In addition to these, passive lossless snubbers with power regeneration loops for energy recovery, consisting of a three winding auxiliary high frequency transformer, auxiliary capacitors and diodes are introduced to achieve zero voltage soft switching from light to full load conditions. Furthermore, this power converter has some advantages such as low cost circuit configuration, simple control scheme and high efficiency. Its operating principle is described and to determine circuit parameters, some practical design considerations are discussed. The effectiveness of the proposed power converter is evaluated and compared with the hard switching PWM DC-DC converter from an experimental point of view and the comparative electromagnetic conduction and radiation noise characteristics of both DC-DC power converter circuits are also depicted.

A High Frequency-Link Secondary-Side Phase-Shifted Full-Range Soft-Switching PWM DC–DC Converter With ZCS Active Rectifier for EV Battery Chargers

A new prototype of a secondary-side phase shift soft-switching PWM dc-dc converter suitable for electric vehicle battery charging systems is presented in this paper. Wide range soft-switching operations are achievable from full load to no load by effectively utilizing the parasitic inductances of the high frequency transformer in the proposed dc-dc converter. In addition, no circulating current occurs in both of the primary and secondary side full-bridge circuits; thereby, the related idling power can be minimized. As a result, high efficiency power conversion can be maintained owing to the full range soft-switching operation and wide range output power and voltage regulations. Its operating principle is presented on the basis of theoretical analysis and simulation results, and the design procedure of the circuit parameters of the proposed dc-dc converter is described. The essential performance and its effectiveness of the proposed dc-dc converter are originally demonstrated from a practical point of view in an experiment using a 1 kW-50 kHz laboratory prototype.

Operation Analysis of Soft Switching PWM DC-DC Converter with Secondary Snubber

The paper deals with analysis of operation of a soft switching PWM DC-DC full-bridge converter with new energy recovery turn-off snubber on secondary side of high frequency power transformer.Principal equations are derived for individual operation states. On the basis of them the diagrams are made out. The diagrams give complex image on the converter behaviour during whole period of operation at nominal load. Theoretical waveforms are compared with simulation results.

새로운 풀-브리지 소프트 스위칭 PWM 인버터를 이용한 용접기용 DC-DC 컨버터의 개발

본 연구에서는 일반적으로 용접기의 전원장치로 사용되어지는 풀-브리지 회로에 1개의 스위치와 1개의 무손실 스너버 부분 공진 커패시터로 구성된 간단한 액티브 보조 부분 공진 스너버를 추가한 새로운 풀-브리지 소프트 스위칭 PWM DC-DC 컨버터를 제안하였다. 제안한 풀-브리지 소프트 스위칭 DC-DC 컨버터 회로는 각 액티브 스위치에 인가된 전압이 DC 버스 라인 전압의 1/2로 되기 때문에 AC 400[V]계 상용전원 라인에 적용할 경우에도 600[V]내압의 스위칭 소자(IGBT)가 적용 가능하며, 기존 회로의 DC 버스 라인 스위치에 발생되는 도통 손실을 저감하여 고주파 변압기의 1차측의 전류가 2차측보다 작아지는 저 전압, 대전류 직류 출력을 얻어 수 있었다. 그리고 모든 영역에서 ZCS/ZVS 동작함으로써 저전압, 대전류 직류 출력의 스위칭 전원 장치에 있어 고주파, 고효율, 고출력을 실현할 수 있다. 이러한 모든 사항은 시뮬레이션과 실험 결과로부터 도출하였으며, 제안한 회로의 단점을 보완할 경우에는 차세대형 TIGㆍMIGㆍMAG 아크 용접기용 전원으로 용이할 것으로 판단된다.

새로운 고주파 절전형 소프트 스위칭 PWM DC-DC 컨버터의 토폴로지

A novel high frequency insulated soft switching PWM DC-DC converter circuit is proposed and then it is achieved the high-efficiency. This converter does not use the o(citing current of a high frequency transformer but use inductance. Then it realizes a widely stable zero voltage switching operation with the use of a novel ON-OFF control method at synchronized rectification power MOSEFETs of the high frequency insulated transformer secondary. Therefore, it is brought over 97[%] measurement efficiency by proposed DC-DC converter.

Pulse current regenerative resonant snubber‐assisted two‐switch flyback‐type ZVS PWM DC‐DC converter

AbstractIn this paper, a two‐switch high‐frequency flyback transformer‐type zero voltage soft‐switching PWM DC‐DC converter using IGBTs is proposed. Effective applications for this power converter can be found in auxiliary power supplies of rolling stock transportation and electric vehicles. This power converter is basically composed of two active power switches and a flyback high‐frequency transformer. In addition to these, two passive lossless snubbers with power regeneration loops for energy recovery, consisting of a three‐winding auxiliary high‐frequency transformer, auxiliary capacitors and diodes are introduced to achieve zero voltage soft switching from light to full load conditions. Furthermore, this power converter has some advantages such as low cost circuit configuration, simple control scheme, and high efficiency.Its operating principle is described and to determine circuit parameters, some practical design considerations are discussed. The effectiveness of the proposed power converter is evaluated and compared with the hard switching PWM DC‐DC converter from an experimental point of view, and the comparative electromagnetic conduction and radiation noise characteristics of both DC‐DC power converter circuits are also depicted. © 2005 Wiley Periodicals, Inc. Electr Eng Jpn, 152(3): 74–81, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20081

Pulse Current Regenerative Resonant Snubber-Assisted Two-Switch Flyback Type ZVS PWM DC-DC Converter

In this paper, a two-switch high frequency flyback transformer type zero voltage soft switching PWM DC-DC converter using IGBTs is proposed. Effective applications for this power converter can be found in auxiliary power supplies of rolling stock transportation and electric vehicles. This power converter is basically composed of two active power switches and a flyback high frequency transformer. In addition to these, two passive lossless snubbers with power regeneration loops for energy recovery, consisting of a three winding auxiliary high frequency transformer, auxiliary capacitors and diodes are introduced to achieve zero voltage soft switching from light to full load conditions. Furthermore, this power converter has some advantages such as low cost circuit configuration, simple control scheme and high efficiency. Its operating principle is described and to determine circuit parameters, some practical design considerations are discussed. The effectiveness of the proposed power converter is evaluated and compared with the hard switching PWM DC-DC converter from an experimental point of view and the comparative electromagnetic conduction and radiation noise characteristics of both DC-DC power converter circuits are also depicted.

High-frequency flyback-type soft-switching PWM DC-DC power converter with energy recovery transformer and auxiliary passive lossless snubbers

A two-switch high-frequency flyback-type zero voltage soft-switching PWM DC-DC power converter for use in auxilary power supplies is proposed. Its basic building block is composed of two active power switches and a flyback high frequency transformer. In addition, two passive lossless snubbers with power regeneration loops for energy recovery that consist of a three-turn auxiliary high frequency transformer, auxiliary capacitors and diodes, are introduced to achieve zero voltage soft switching in the full range of light to full load conditions. The power converter has the advantages of a low cost circuit configuration, a simple control scheme and a high efficiency.The converter's operating principle is described and to in order determine circuit parameters, some practical design considerations are discussed. The effectiveness of the proposed power converter is evaluated and is compared to a hard-switching PWM DC-DC converter. The comparative electromagnetic conductive noise characteristics of both DC-DC power converter circuits are also investigated.

ZVS Bridge Leg and ZCS Bridge Leg DC-DC Converter with Tapped Inductor Filter

In this paper, a novel full-bridge soft-switching phase-shifted PWM DC-DC power converter circuit is presented. A tapped inductor filter is implemented in the proposed converter topology to achieve soft switching commutation for the active power switches under wide load variation range, to minimize circulating current without using additional resonant circuit and/or auxiliary switching devices. The effectiveness of the proposed soft-switching DC-DC power converter is verified in experiment with 2kW-100kHz breadboard circuit using IGBTs.

A New Interleaved Two Switch Forward PWM DC-DC Converter Operating with Soft-Switching

A new interleaved two switch forward soft-switching PWM DC-DC converter topology is presented. The proposed converter is developed to minimize circulating current with no additional auxiliary circuits. The principle of operation is illustrated. In addition, to verify the performances, key experiments are built and tested with a 500W, 100kHz breadboard.

Two-switch forward soft-switching PWM DC-DC power converter

A novel prototype is presented of a two-switch forward soft-switching PWM DC-DC power converter with reduced switching and conduction power losses, which can operate under two soft commutations of zero voltage and zero current of full bridge circuit topology.

A novel soft-switching PWM dc-dc converter with high-frequency transformer link and its open-loop regulation characteristics

In the practical requirement for high efficiency, high power density, and high performance in switched-mode power supplies and their related application systems, a variety of circuit topologies of dc-dc converters incorporating soft-switching PDM, PFM, and PWM control schemes have attracted special interest in low-power and high-power applications. Some types of quasi-resonant soft-switching PWM converters have remarkable advantages, such as lowered switching losses of power semiconductor devices, reduced dynamic electrical stresses, constant-frequency operation, simple control schemes, and reduced EMI noise. However, most soft-switched quasi-resonant PWM converters developed so far include some inherent problems which must be solved, such as reduced power conversion efficiency due to significant circulating current generation. In recent years, a newly modified prototype soft-switched PWM dc-dc converter with a high-frequency transformer link has been proposed, which is capable of excluding circulating current operation mode. This paper presents a novel high-frequency transformer link soft-switching PWM dc-dc converter using active switches in the rectifier circuit. Its operating principles and unique features are described and compared with previously developed dc-dc converters. The operating performance of this converter in the steady state is illustrated and discussed, including simulated analytical and experimental results. © 1997 Scripta Technica, Inc. Electr Eng Jpn, 119(3): 81–93, 1997

A novel soft‐switching PWM dc‐dc converter with high‐frequency transformer link and its open‐loop regulation characteristics

In the practical requirement for high efficiency, high power density, and high performance in switched-mode power supplies and their related application systems, a variety of circuit topologies of dc-dc converters incorporating soft-switching PDM, PFM, and PWM control schemes have attracted special interest in low-power and high-power applications. Some types of quasi-resonant soft-switching PWM converters have remarkable advantages, such as lowered switching losses of power semiconductor devices, reduced dynamic electrical stresses, constant-frequency operation, simple control schemes, and reduced EMI noise. However, most soft-switched quasi-resonant PWM converters developed so far include some inherent problems which must be solved, such as reduced power conversion efficiency due to significant circulating current generation. In recent years, a newly modified prototype soft-switched PWM dc-dc converter with a high-frequency transformer link has been proposed, which is capable of excluding circulating current operation mode. This paper presents a novel high-frequency transformer link soft-switching PWM dc-dc converter using active switches in the rectifier circuit. Its operating principles and unique features are described and compared with previously developed dc-dc converters. The operating performance of this converter in the steady state is illustrated and discussed, including simulated analytical and experimental results. © 1997 Scripta Technica, Inc. Electr Eng Jpn, 119(3): 81–93, 1997

A novel soft-switching PWM DC-DC converter with high-frequency transformer link and its open loop regulation characteristics.

In the practical requirement for high-efficiency, high power density and high-performance in the switched-mode power supplies and their related application systems, a variety of circuit topologies of DC-DC converters incorporating soft-switching PDM, PFM and PWM control schemes have attracted special interest in the fields of low power and high power applications. Some types of quasi-resonant soft-switching PWM converters have remarkable advantages such as lowered switching losses of power semiconductor devices, reduced dynamic electrical stresses, constant frequency operation, simple control scheme as well as reduced EMI noise.However, most of soft-switched quasi-resonant PWM converters developed so far include some inherent items which have to be solved such as reduced power conversion efficiency due to significant circulating current generation. In recent years, the newly modified prototype of soft-switched PWM DC-DC converter with a high-frequency transformer link has been proposed, which is capable of excluding circulating current operation mode.This paper presents a novel high-frequency transformer link soft-switching PWM DC-DC converter using active switches in rectifier circuit. Its operating principle and unique features are described as compared with the previously developed DC-DC converter. Operating performance of this converter in steady-state are illutrated and disccused including the simulated analytical and experimental results.

Soft-Switching PWM DC-DC Converter with Reduced Circulating Current.

Soft-switching phase-shifted PWM converters have been attracted much attention because of their low switching losses, constant frequency operation and simple control. However, a circulating current flows through the transformer and the primary bridge circuit during the freewheeling interval, resulting in relatively high current stresses for the transformer and switching devices compared with those of conventional hard-switching PWM converters.This paper presents an improved soft-switching PWM DC-DC converter which can substantially reduce the circulating current by employing a tapped inductor for output low-pass filter. The principle of operation and the role of the tapped inductor are illustrated. The effectiveness of the tapped inductor is evaluated through simulating analysis. Moreover, a 500W-100kHz prototype converter is implemented to demonstrate the excellent performances of both low switching and low conduction losses.