• 전력전자학회논문지
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• 제15권2호
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• pp.119-126
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• 2010

An integrated magnetic (IM) transformer is proposed for a phase shifted full bridge (PSFB) converter with zero voltage switching (ZVS). In a proposed IM transformer, the transformer is located on the center leg of E-core and the output inductor is wound on two outer legs with air gap. The proposed IM transformer is analyzed by using the magnetic capacitor model. For reducing the core size, EE core is redesigned. The proposed IM transformer is experimentally verified on a 1.2 kW prototype converter. The converter efficiency with the proposed IM transformer is about 93 % at full load and its volume size can be reduced. It can be expected that the power density can be largely increased with the proposed IM transformer.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제49권10호
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• pp.683-692
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• 2000

A new primary-side-assisted zero-voltage and zero-current switching full bridge DC-DC converter with transformer isolation is proposed. The auxiliary circuit adopted to assist ZCS for the leading leg is composed of only one small transformer and two diodes. It has a simple and robust structure, and load current control capability even in short circuit conditions. Possibility of magnetic saturation due to asymmetricity of circuits or transient phenomena is greatly reduced, which is a very attractive feature in DC/DC converters with transformer isolation. The power rating of the auxiliary transformer is about 10% of that of the main transformer. Operation of a 12.5KW prototype designed for welding application was verified by experiments.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제5B권4호
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• pp.366-373
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• 2005

This paper presents two new circuit topologies of the dc busline side active resonant snubber assisted voltage source high frequency link soft switching PWM full-bridge dc-dc power converters acceptable for either utility ac 200V-rms or ac 400V-rms input grid. These high frequency switching dc-dc converters proposed in this paper are composed of a typical voltage source-fed full-bridge PWM inverter, high frequency transformer with center tap, high frequency diode rectifier with inductor input filter and dc busline side series switches with the aid of a dc busline parallel capacitive lossless snubber. All the active switches in the full-bridge arms as well as dc busline snubber can achieve ZCS turn-on and ZVS turn-off transition commutation with the aid of a transformer leakage inductive component and consequently the total switching power losses can be effectively reduced. So that, a high switching frequency operation of IGBTs in the voltage source full bridge inverter can be actually designed more than about 20 kHz. It is confirmed that the more the switching frequency of full-bridge soft switching inverter increases, the more soft switching PWM dc-dc converter with a high frequency transformer link has remarkable advantages for its power conversion efficiency and power density implementations as compared with the conventional hard switching PWM inverter type dc-dc power converter. The effectiveness of these new dc-dc power converter topologies can be proved to be more suitable for low voltage and large current dc-dc power supply as arc welding equipment from a practical point of view.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2012년도 전력전자학술대회 논문집
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• pp.518-519
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• 2012

This paper suggested a fuel cell generation system which combined interleaved full-bridge converter with half-bridge inverter. High ratio step-up converter is essential to use the power as general voltage source. Full-bridge converter has high efficiency and can boost the input voltage to high output with transformer. With series connected capacitors, interleaved full-bridge converter and half-bridge inverter are combined. Half-bridge inverter has two fewer switches compared to full-bridge type. Also, switching loss can be reduced. The performance is verified through simulation with 1.5[kW] fuel cell generation system.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제52권12호
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• pp.655-660
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• 2003

This paper proposes new single stage power factor correction (PFC) full bridge converter. The proposed converter is combined previous ZVS full bridge DC/DC converter with two inductors, two diodes, two magnetic coupling transformer for PFC. This process of power is isolated from the source and also regulate stable DC output voltage in a category. In this topology, the voltage stress of main switches is reduced by zero voltage switching. Moreover, the proposed converter doesn't need active PFC switch and auxiliarly circuits, like control and gating board, so it could decrease the size and cost and increase the efficiency.

• 전력전자학회논문지
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• 제7권5호
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• pp.443-452
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• 2002

수 백 Watt 급의 통신용 장비 등에 적합하도록 고안된, 직렬 연결된 두 개의 트랜스포머를 갖는 새로운 위상천이 풀 브릿지 컨버터를 제시한다. 제안된 회로의 장점은 넓은 입력 범위를 가지며, 경부하에서도 스위치의 영전압 조건을 보다 쉽게 만족시킬 수 있다는 점, 그리고 작은 출력 변동율을 갖는다는 점 등이다. 뿐만 아니라, 직렬로 연결된 두 개의 트랜스포머가 번갈아 가면서 주 트랜스포머로서의 역할과 출력 인덕터로서의 역할을 함께 수행하므로, 출력측에서는 인덕터없이 필터링이 가능하게 되고, 따라서 고전력밀도의 컨버터를 제작할 수 있게 된다. 모드 해석과 대신호 모델링을 통한 설계식의 유도, 그리고 실험 결과를 보여줌으로써 제안된 컨버터를 검증한다.

• 융합신호처리학회논문지
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• 제3권3호
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• pp.70-75
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• 2002

본 논문은 새로운 단일 전력단 역률보상 풀 브리지 컨버터를 제안하였다. 제안된 컨버터는 역률보상을 위하여 앞단에 2개의 인덕터, 2개의 다이오드, 2개의 자성결합 변압기를 가진 2VS 풀브리지 DC/DC 컨버터로 구성되어 있다. 이러한 구성방법에 의해 전력은 전원에서 분리되고, 안정된 직류출력전압을 얻을 수 있다. 이 토폴로지에서 주소자의 전압스트레스는 영전압스위칭에 의해서 감소되며, 또한 제안된 컨버터는 능동 역률보정 스위치와 제어 및 게이팅 보드와 같은 보조회로가 필요치 않게되어 규격과 단가를 낮출 수 있을 뿐 아니라 효율을 증가시킬 수 있다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2008년도 하계학술대회 논문집
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• pp.40-42
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• 2008

This integrated magnetic (IM) transformer is proposed for a phase shifted full bridge (PSFB) converter with zero voltage switching (ZVS). In a new IM transformer, the transformer is located on the center leg of E-core and the output inductor is wound on two outer legs. The proposed circuit is analyzed electrically and magnetically. An E-core is redesigned and implemented. The proposed IM transformer is experimentally compared with the conventional one through a 1.2kW prototype converter.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2013년도 전력전자학술대회 논문집
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• pp.403-404
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• 2013

In this paper, a PCS which consists of high boost interleaved full-bridge converter and single phase half-bridge inverter is proposed. Proposed PCS is using two full bridge converter modules. PCS consists of parallel input / serial output. It can reduce turn ratio of high frequency transformer. In this paper, PCS which is using 1.5[kW] interleaved full-bridge converter and single phase half bridge inverter is designed and verified stability of system through experiment.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2005년도 전력전자학술대회 논문집
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• pp.436-438
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• 2005

This paper presents a Zero-Current Switching(ZCS) two-transformer phase-shift full-bridge(TTFB) converter using voltage ripple. The proposed converter provides Zero-Voltage Switching(2VS) of leading leg switches and ZCS of lagging leg switches using volt-age ripple. Especially, circulating current Is reduced by ZCS operation and there are no additional components required for the soft switching of power switches. Furthermore, in case of light load, ZVS operation of lagging leg can be achieved. The operations, analysis and design consideration of proposed converter are presented. To verify the validity of the proposed converter, experimental results for a flow (205V, 2A) prototype are presented.