• The Transactions of the Korean Institute of Power Electronics
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• v.13 no.4
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• pp.263-269
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• 2008

In this paper, an interleaved boost converter (IBC) with ZVT cell using a single resonant inductor in continuous conduction mode (CCM) is proposed. The IBC with the proposed ZVT cell has advantages such as a simple circuit, reduced size and low cost by using a single resonant inductor. It is more suitable for high power applications. The proposed ZVT cell circuit and principles for the IBC are explained in detail. The validity of the IBC with proposed ZVT cell is verified through experimental results.

• Proceedings of the KIPE Conference
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• 2007.07a
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• pp.126-128
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• 2007

This paper presents a new soft switching dc-to-dc converter that employs IM transformer. Detailed analysis and design considerations of the proposed circuits are presented. By applying the proposed magnetic integration procedure, new integrated magnetic circuits featuring low loss, simple structure are then developed to overcome the limitations of prior art. Consequently, the power loss and the size of the integrated magnetic device are greatly reduced. The operation and performance of the proposed converter are demonstrated with an experimental converter that delivers a 5V/5A output from a 48V input at the maximum efficiency of 90 %.

• Proceedings of the KIPE Conference
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• 2007.07a
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• pp.178-181
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• 2007

본 논문에서는 연료전지자동차의 저전압 배터리 충 방전을 위한 3상 양방향 DC-DC 컨버터를 제안한다. 제안한 3상 컨버터는 기존의 단상 컨버터에 비해 인터리빙 효과의 증대로 인한 입 출력 필터 사이즈 감소와 변압기의 이용률 증가로 인한 VA정격의 감소가 가능하다. 고전압 측에서는 비대칭 소프트 스위칭이 되고, 저전압 측에서는 동기정류 방식으로 도통손실을 감소시켜 높은 효율과 전력밀도를 가질 수 있다. 제안하는 3상 양방향 DC-DC 컨버터의 동작원리와 기존방식과의 비교 분석을 수행하였으며 시뮬레이션을 통해 타당성을 검증하였다.

• Proceedings of the KIPE Conference
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• 2017.07a
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• pp.254-255
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• 2017

공진형 컨버터에서 일반적으로 소프트 스위칭과 같은 조건을 만족시키기 위해 주파수 제어를 많이 사용한다. 그러나 전계결합형 무선전력전송 시스템 특성상 이격 거리나 정렬 오차 정도 따라 송 수신부를 연결하는 링크 캐패시턴스 값이 민감하게 변한다. 이런 시스템에서는 공진 주파수 추종과 동시에 시비율 제어가 필요하다. 송신부 앞 또는 부하단에 dc/dc컨버터를 추가하는 2단 구성은 시스템 효율이 1단 구성에 비해 낮다는 단점이 있다. 따라서 본 논문에서는 무선전력전송 시스템에 비대칭 하프 브릿지를 사용하여 시비율 제어와 주파수 추종제어를 할 수 있는 구조를 제안한다. 이는 시뮬레이션을 이용하여 검증한다.

• Proceedings of the KIPE Conference
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• 2001.07a
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• pp.694-697
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• 2001

A optimal soft switching technique for A/DC full bridge converter is proposed. variable soft switching single stage AC/DC full bridge converter with unit power factor are presented in this paper. Using soft switching, we can reduce a switching losses. As a result, achieving good power factor and achieving a good efficiency. We search a optimal soft switching technique in this paper and to verify the theoretical analysis of the presented AC/DC full bridge converter, a design example is given with its Pspice and Psim simulation and experimental results.

• Proceedings of the KIPE Conference
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• 2008.10a
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• pp.133-136
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• 2008

This paper presents a novel soft switching topology with resonant DC-DC converter and inverter. The resonant DC-DC converter consists of the auxiliary switch, resonant capacitor and inductor. All switches in the proposed topology is turn on at ZCS and turn off at ZVS operation. The proposed soft switching technology can be obtained the reduced switching losses and voltage and current stress of the power devices. Therefore, the resonant converter efficiency is higher than conventional boost converter. Simulation results on a 1kW soft switching converter are presented.

• Proceedings of the KIPE Conference
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• 2008.10a
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• pp.137-139
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• 2008

A ZVS resonant DC-link inverter using soft switching boost converter is proposed in this paper. The proposed inverter is capable of switching in zero voltage states during the zero-dc-link-voltage period. As a result, the proposed circuit can reduce the switching loss. Operational principles and detailed analysis are presented. Simulation results are also presented to verify the operation principle.

• Proceedings of the KIPE Conference
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• 2008.10a
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• pp.118-120
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• 2008

In this paper, a soft switching boost converter with H-auxiliary resonant circuit is proposed. Using some resonant components, the circuit can be achieved the soft switching capability. Each of the switches in the proposed circuit perform ZVS at turn off and ZCS at turn on. Thus, the high efficiency characteristic can also be obtained, and then the size of the total system can be reduced. The operational principle of the soft switching boost converter in theoretically analyzed. Simulation results validate the analysis and experimental results demonstrate soft switching boost converter benefits.

• Proceedings of the KIPE Conference
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• 2008.10a
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• pp.121-123
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• 2008

A high efficiency soft switching boost converter is proposed in this paper. The conventional boost converter generates switching losses at turn on and off. Because of those, the whole system efficiency is reduced. The proposed converter utilizes soft switching method using resonant circuit with an auxiliary switch. Therefore, the proposed converter reduces switching losses lower than the hard switching. The proposed soft switching boost converter can be applied to photovoltaic system, power factor correction circuit and etc.

• Proceedings of the KIPE Conference
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• 2014.07a
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• pp.315-316
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• 2014

본 논문에서는 에너지저장장치에서의 배터리 충 방전용 고효율 양방향 DC-DC 컨버터를 제안한다. 제안하는 컨버터는 비절연형이면서 모든 스위치가 ZVS 턴온을 하기 때문에 높은 효율을 달성 할 수 있을 뿐만 아니라 듀티를 크게 사용하지 않아도 약 8~9배의 높은 승 강압비로 동작이 가능하기 때문에 계통 연계를 위한 400V의 DC링크 전압이 있는 응용에 48V 배터리를 사용 할 수 있다. 본 논문에서는 제안하는 컨버터의 타당성을 검증하기 위하여 3kW급 시작품을 제작하여 실험하였다.