• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.15 no.2
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• pp.31-37
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• 2001

This paper propose ZVS-HB type resonant DC/DC converter have earth different output characteristics using division ratio, not only a source division function but a resonant function and soft switching technique(ZVS, ZCS) instead of conventional source division capacitor. Circuit analysis generally described using normalized parameters most of characteristics with division ratio of source division capacitor. Also, this paper citified a rightfulness of characteristic analysis in comparison with a theoretical values and a experimental values obtain from experiment using Power-MOSFET.

• Journal of Power Electronics
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• v.17 no.1
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• pp.41-55
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• 2017

This study proposes a novel zero voltage transition (ZVT) pulse width modulation (PWM) DC-DC interleaved boost converter with an active snubber cell. All the semiconductor devices in the converter turn on and off with soft switching to reduce the switching power losses and improve the overall efficiency. Through the interleaved approach, the current stresses of the main devices and the ripple of the output voltage and input current are reduced. The main switches turn on with ZVT and turn off with zero voltage switching (ZVS). The auxiliary switch turns on with zero current switching (ZCS) and turns off with ZVS. In addition, the snubber cell does not create additional current or voltage stress on the main switches and main diodes. The proposed converter can smoothly achieve soft switching characteristics even under light load conditions. The theoretical analysis and operating stages of the proposed converter are made for the D > 50% and D < 50% modes. Finally, a prototype of the proposed converter is implemented, and the experimental results are given in detail for 500 W and 50 kHz. The overall efficiency of the proposed converter reached 95.5% at nominal output power.

• The Transactions of the Korean Institute of Power Electronics
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• v.19 no.4
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• pp.383-390
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• 2014

This paper deals with novel soft-switching method for a bidirectional DC-DC converter in battery charging and discharging system. The proposed soft-switching method provides ZVS and ZCS at turn-on, and ZVS at turn-off of the switch in both charging and discharging operation modes. The soft switching condition can be obtained in wide load range, and provide low switching loss as well as low voltage spike at turn-off of the switch. Proposed method is analyzed in charging and discharging mode. Simulation and experimental results validate the usefulness of the proposed soft-switching method.

• Proceedings of the KIPE Conference
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• 2019.07a
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• pp.485-486
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• 2019

본 논문에서는 정격부하에서 효율이 가장 높으면서 동시에 Zero Voltage Switching(ZVS)를 만족하는 인덕터를 설계하는 방법을 제안한다. 제안하는 인덕터 설계 방법은 주어진 정격에서 스위치에 존재하는 스너버 캐패시터를 고려한 ZVS 식을 구하며, 스위치의 특성을 고려한 Dead-time을 설계하고 이를 통해 인덕턴스를 최소화 한다. 시뮬레이션을 통해 스너버 캐패시터의 전압 파형 및 스위치의 손실을 비교하였다.

• Proceedings of the KIPE Conference
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• 2000.07a
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• pp.400-403
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• 2000

This paper deals with the active clamp ZVS flyback converter for semiconductor plasma etching system. The proposed converter has the characteristics of the good power facter low switching noise and efficiency improvement. The characteristics are verified through simulation results. Furthermore the ringing effect due to output capacitance of the main switch can be eliminated by use of active clamp circuit.

• Proceedings of the KIPE Conference
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• 2000.07a
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• pp.404-408
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• 2000

The novel control method of ZVS Full-bridge PWM converter with pulse load current is proposed. This new control method can reduce the switching loss of switches during no load condition. Moreover by using feed-forward load current information this method can obtain better transient dynamics compared to the system with only linear feedback control.

• Proceedings of the KIPE Conference
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• 1999.07a
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• pp.622-625
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• 1999

This paper introduces a novel zero-voltage switching (ZVS)) pulse width modulation (PWM) active clamping dc-to-dc boost converter. This technique presents ZVS commutation without additional voltage stress and a significant increase in the circulating reactive energy throughout the converter. Therefore, all of the losses for the switches are minimized, and high power density system can be realized. The characteristics are verified through simulation and experimental results.

• Proceedings of the KIPE Conference
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• 2010.07a
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• pp.572-573
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• 2010

본 논문은 30kW급 CCPS(Capacitor Charging Power Supply)용 FB(Full Bridge)-PS(Phase Shift)- Zero Voltage Switching(ZVS) DC/DC Converter의 스위칭 손실저감을 위한 스너버 커패시터의 설계에 대해 논하였다. FB-PS-ZVS DC-DC 컨버터의 하드스위칭 손실과 스너버 커패시터에 의한 스위칭 손실 저감 효과를 비교했다. 첨두 전류를 이용하여 스너버 커패시터를 설계하였으며, 부하 실험을 통해 설계의 타당성을 실험적으로 검증했다.

• Proceedings of the KIPE Conference
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• 2005.07a
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• pp.266-268
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• 2005

A new synchronous switch controlled transient current build-up zero voltage switching (TCB-ZVS) forward converter is proposed. The proposed converter is suitable for the low-voltage and high-current applications. The features of the proposed converter are low conduction loss of magnetizing current, no additional circuit for the ZVS operation, high efficiency, high power density and low EMI noise throughout all load conditions.

• The Transactions of the Korean Institute of Power Electronics
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• v.18 no.4
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• pp.403-411
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• 2013

This paper proposes an isolated bidirectional three-phase push-pull dc-dc converter for high power application such as eco-friendly vehicles, renewable energy systems, energy storage systems, and solid-state transformers. The proposed converter achieves ZVS turn-on of all switches and volume of passive components is small by an effect of three-phase interleaving. The proposed converter has identical switching pattern for both boost and buck mode, and therefore can provide seamless characteristic at the mode transition. A 3kW prototype of the proposed converter has been built and tested to verify the validity of the proposed operation.