• 전력전자학회:학술대회논문집
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• 전력전자학회 2010년도 하계학술대회 논문집
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• pp.487-488
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• 2010

This paper proposes a soft switching boost converter with an auxiliary circuit. This circuit helps a main switch operate as a soft switching. The main switch operates ZVS turn-on and ZVS turn-off. And the auxiliary switch operates ZCS turn-on and ZVS turn-off. In this paper, operation modes are analyzed and soft switching operation is verified through simulations.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2018년도 전력전자학술대회
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• pp.189-191
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• 2018

This paper introduces a novel ZVS interleaved totem-pole PFC with the reduced circulating current and the reverse recovery current of the diodes. With the help of a simple auxiliary inductor, both ZVS turn-on of the main switches and soft turn-off of the body diodes can be achieved. In the proposed totem-pole PFC topology since the switching losses and the reverse recovery losses can be significantly reduced, the typical Si MOSFETs can be employed. In addition the circulating current is reduced by adjusting the switching frequency. The proposed PFC topology can be a low cost solution to achieve high efficiency in high power PFC applications. The validity and the feasibility of the proposed topology is verified by the experimental results with a 3.3kW interleaved totem-pole PFC converter.

• 전기전자학회논문지
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• 제24권1호
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• pp.260-268
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• 2020

본 논문에서는 스위칭 시 발생하는 턴-온 및 턴-오프 손실을 줄일 수 있는 LS-ZVS-LSTC를 이용한 D급 SEPP형 고주파 공진 인버터에 대해서 나타내고 있다. 본 논문에서 제안한 LS-ZVS-LSTC를 이용한 고주파 공진 회로의 해석은 무차원화 파라메타를 도입하여 범용성 있게 기술하였다. 또한 제안 인버터의 운전 특성은 무파원화 제어 주파수(μ), 무차원화 부하시정수(τ), 결합계수(κ) 등의 제어 파라메타를 이용하여 특성 평가를 수행하였다. 특성 평가를 통한 특성치를 토대로 1.8[kW] D급 SEPP형 LS-ZVS-LSTC 고주파 인버터 설계 기법의 일예를 제시하였으며, 이론 해석의 정당성은 실험을 통해 입증하였다.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제52권12호
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• pp.632-640
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• 2003

In conventional Zero-Voltage-Transition(ZVT) PWM converters, zero-voltage turn-on and turn-off for main switch without increasing voltage/current stresses is achieved at a fixed frequency. The switching loss, stress, and noise, however, can't be minimized because they adopt auxiliary switches turned off under hard-switching condition. In this paper, new ZVS-PWM converters of which both active and passive switches are always operating with soft-switching condition are proposed. Therefore, the proposed ZVS-PWM converters are most suitable for avionics applications requiring high-power density. Breadboarded ZVS-PWM boost converters using power MOSFET are constructed to verify theoretical analysis.

• 전력전자학회논문지
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• 제4권4호
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• pp.311-317
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• 1999

본 논문에서는 SEPP-LCC형 부하 공진 고주파 인버터의 한 회로형식을 제안하고, 그 동작원리에 관해서 명확히 하였다. 제안한 인버터는 스위칭 소자 양단에 병렬로 커패시터를 추가함으로써 스위칭 소자의 턴-온과 턴-오프시에 발생하는 스위칭 손실, 노이즈, 스트레스 등을 줄일 수 있다. 범용성 있는 회로해석을 위하여 무차원화 파라미터를 도입하였고, 동작특성 및 평가를 통하여 얻은 특성치를 이용하여 회로를 설계하였다. 또한, 실험을 통하여 이론해석의 정당성을 입증하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2009년도 정기총회 및 추계학술대회 논문집
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• pp.155-157
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• 2009

This paper proposed a soft switching boost converter with an auxiliary circuit, and a modified control method for reduction of switch stress. The proposed converter applies an auxiliary circuit, which is added to the conventional boost converter and used to achieve soft switching for both a main switch and an auxiliary switch. The auxiliary circuit consist of a resonant inductor and two capacitors, an auxiliary switch. The main switch is operated ZVS turn-on, turn-off also auxiliary switch is operated ZCS turn-on, ZVS turn-off. The proposed soft switching boost converter has lower switch loss and higher efficiency than conventional soft switching boost converter.

• Journal of Power Electronics
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• 제19권1호
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• pp.11-23
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• 2019

In this study, a novel zero voltage zero current transition (ZVZCT) bidirectional DC-DC converter is proposed by employing coupled inductors. This converter can turn the main switch on at ZVZCT and it can turn it off with zero voltage switching (ZVS) for both the boost and buck modes. These characteristics are obtained by using a simple auxiliary sub-circuit regardless of the power flow direction. In the boost mode, the auxiliary switch achieves zero current switching (ZCS) turn-on and ZVS turn off. Due to the coupling inductors, this converter can make further efficiency improvements because the resonant energy in the capacitor or inductor can be transferred to the load. The main diode operates with ZVT turn-on and ZCS turn-off in the boost mode. For the buck mode, there is a releasing circuit to conduct the currents generated by the magnetic flux leakage to the output. The auxiliary switch turns on with ZCS and it turns off with ZVT. The main diode also turns on with ZVT and turns off with ZCS. The design method and operation principles of the converter are discussed. A 500 W experimental prototype has been built and verified by experimental results.

• 전력전자학회논문지
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• 제16권3호
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• pp.242-249
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• 2011

제안하는 컨버터는 부스트 하프브리지-전압 더블러를 각각 병렬-직렬로 연결하여 출력전력 및 출력전압을 증대시키므로 고승압 대전력 응용에서 소자의 선정이 용이하다. 특히 고주파변압기 턴 비를 작게 할 수 있고 DC 오프셋이 제거되어 최적의 변압기 설계가 가능하며, 3개의 코아로 전력이 분배되어 Low Profile 및 열 분산에 유리하다. 제안하는 컨버터는 전 영역(0 ∼ 1)의 듀티 사용으로 스타트업 및 추가의 클램프회로가 필요 없으며 입력전압 변동이 큰 응용에 적합하다. 또한 넓은 듀티영역에서 스위치의 ZVS 턴온과 다이오드의 ZCS 턴온 턴오프가 성취되므로 고효율을 달성할 수 있다. 제안하는 컨버터를 5 kW급 시작품으로 검증하였다.

• Journal of Power Electronics
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• 제18권3호
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• pp.681-693
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• 2018

This paper proposes a soft-switching bidirectional dc-dc converter (BDC) with an auxiliary circuit. The proposed BDC can achieve the zero-voltage switching (ZVS) using an auxiliary circuit in the buck and boost operations. The auxiliary circuit supplies optimal energy for the ZVS operation of the main switches. The auxiliary circuit consists of a resonant inductor, a back-to-back switch and two capacitors. A small-sized resonant inductor and an auxiliary switch with a low-rated voltage can be used in the auxiliary circuit. Zero-current switching (ZCS) turn-on and turn-off of the auxiliary switches are possible. The proposed soft-switching scheme has a look-up table for optimal switching of the auxiliary switches. The proposed strategy properly adjusts the turn-on time of the auxiliary switch according to the load current. The proposed BDC is verified by the results of PSIM simulations and experiments on a 3-kW ZVS BDC system.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1999년도 전력전자학술대회 논문집
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• pp.114-117
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• 1999

This paper has described about principle and form of proposed circuit made use of soft switching technology ZVS(Zero-Voltage-Switching) to reduce turn on and off loss at switching. Also, the analysis of the proposed circuit was described by using normalized parameter and operating characteristics has been evaluated as to switching frequency and parameters. Based on the characteristics value, a method of the circuit design is proposed. The theoretical results are in good agreement with the experimental ones. The proposed circuit is considerated to be useful for induction heating and discharge lamp.