• Proceedings of the KIPE Conference
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• 1997.07a
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• pp.111-115
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• 1997

This Paper is concerned on developing DC-DC converter using ZVS-FB-PWM Converter. The converter output is 28V and regulated by phase shift control methode. MOSFET is used by the main switching device and high frequency transfomer is made for operating at 300㎑ switching frequency. When the load vary widely, converter's ZVS characteristic is expressed by experiment result.

• Proceedings of the KIEE Conference
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• 1993.07b
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• pp.895-898
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• 1993

The objective of the study is to design and develope a 6kW DC/DC converter with bidirectional power-flow capability. The DC/DC convener topology used in the study is the full-bridge(FB) pulse width modulated convener using ZVS. High-frequency transformer is included to provide isolation between the source and loads. This paper includes simulation and experimental results of the proposed convener.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.24 no.1
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• pp.152-159
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• 2010

High power density and power conversion efficiency have been required in the power converters according to the rapid growth of industry. In this context, the next generation High Speed Train(HST) requires power converter which has high-efficiency, high-performance and high-density. In this paper, the new control technique for battery charger used for the next generation HST is proposed. The phase shift ZVZCS converter is classified according to a resonant circuit which is located in the primary or secondary side. In this paper, The PWM switching technique using all-pass filter is proposed to control ZVZCS converter which has resonant circuit in the secondary side. ATmega_128 micro controller based in all-pass filter in substitute for phase shift IC is presented to have digital control. To verify the proposed topology, the simulation and experiment are performed by using PSIM software and 1[kW] experimental set-up.

• Proceedings of the KIPE Conference
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• 1998.10a
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• pp.442-446
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• 1998

With the advent of the high-speed microprocessor and DSP, the possibility of executing a control strategy in digital domain has become a reality. By the use of the DSP and microprocessor controller, many high power converters such as especially inverter and motor drive system may be enhanced resulting in the improved robustness to EMI, the ability to communicate the operating conditions and the ease of adjusting the control parameters. But, the digital controller using DSP or microprocessor is not applied in the high frequency switching power supplies, especially full bridge dc/dc converter. So, this paper presents the method and realization of designing a digital-to-phase shift PWM circuit for full digital controlled phase-shifted full bridge dc/dc converter with zero voltage switching. The operating principles, simulation and experimental results will be presented.

• Proceedings of the KIEE Conference
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• 2000.07b
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• pp.1303-1305
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• 2000

A zero voltage and zero current switching(ZVZCS) fullbridge (FB) PWM converter with secondary auxiliary circuit is proposed. Based on the ZVZCS technique, the ZCS of the lagging-leg switch and ZVS of the leading-leg switch are implemented. And the each secondary side voltage overshoot is decreased by additional secondary auxiliary circuit in this paper. The illustration of its operation principle and the simulation result are presented here.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1087-1088
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• 2008

계통연계형 태양광발전 시스템을 구성하고 있는 전력변환 장치인 PCS(power conditioning system)은 성능, 효율, 가격, 그리고 보호 및 협조 문제에 따라 여러 가지 형태가 있다. 본 논문에서는 고주파 변압기를 이용한 컨버터에 대하여 제안한다. 이 시스템은 FB(full bridge) 컨버터, 고주파 변압기, 다이오드 정류기, DC link 필터, PWM 인버터 그리고 저역통과필터로 이루어져 있다. 고주파 변압기를 이용한 컨버터의 스위칭 주파수는 10kHz로 Uniploar PWM 방식을 이용하였고, 변압기의 2차단에 다이오드 정류기와 커패시터를 통하여 DC로 정류한다. 고주파 변압기를 이용한 컨버터의 제어는 전압형 전류제어로 MPPT 알고리즘에 의한 입력전류제어를 담당하고, DC link 전압의 제어는 Unipolar PWM 인버터에서 제어를 담당한다. 논문에서는 고주파 변압기를 이용한 FB Conveter의 제어 방법에 대하여 시뮬레이션을 통하여 검증하고자 한다.

• Proceedings of the KIPE Conference
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• 2010.07a
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• pp.154-155
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• 2010

본 논문은 최소의 스위칭 소자를 이용한 절연형 Full-Bridge (FB) buck-boost DC-DC 컨버터를 제안한다. 기존의 dual-bridge 방식을 이용한 buck-boost 컨버터와는 달리 본 논문에서 제안한 방식은 변압기 1차측에만 스위칭 소자를 사용하고 2차측에는 다이오드 정류기를 사용한다. 필요한 buck-boost 기능을 구현하기 위하여 입력단에 2개의 인덕터를 추가하여 2 phase interleaved 방식으로 동작을 한다. 500 W 의 prototype을 제작하여 본 논문에서 제안한 방식의 타당성을 실험적으로 검증 한다.

• Proceedings of the KIPE Conference
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• 2013.07a
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• pp.309-310
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• 2013

기존의 풀 브릿지 DC-DC 컨버터는 대용량으로 갈수록 변압기와 필터의 크기가 커지게 되는 단점이 있다. 본 논문에서는 스위칭 셀(switching cell)을 이용해서 변압기 크기를 줄일 수 있는 새로운 컨버터를 제안한다. 이 컨버터는 변압기에 스위칭 주파수의 2배 주파수가 인가되고, 또한 입력 전압의 절반이 인가된다. 따라서 기존 컨버터 변압기의 크기를 획기적으로 줄일 수 있는 장점이 있다. 이를 실험을 통해 검증한다.

• Proceedings of the KIEE Conference
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• 1997.07f
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• pp.2204-2206
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• 1997

A novel zero voltage and zero current switching (ZVZCS) full bridge (FB) PWM converter with a low output current ripple is proposed. The proposed circuit improve the demerits of the previously presented ZVBCS-FB-PWM converters[5-8] such as use of lossy components or additional active switches. A simple auxiliary circuit which includes neither lossy components nor active switches provides ZVZCS conditions to primary switches, ZVS for leading-leg switches and ZCS for lagging-leg switches. In addition, this proposed circuit reduces a output current ripple considerably. Many advantages including simple circuit topology, high efficiency, low cost and low current ripple make the new converter attractive far high power (> 1kW) applications.

• Proceedings of the KIPE Conference
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• 2005.07a
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• pp.395-398
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• 2005

A novel full-bridge converter with a new energy-recovery driver implemented a regenerative transformer is proposed to improve the efficiency for wide input voltage range and load variation. The main switches achieve ZVS independent of the load current condition. During the free wheeling period, conduction loss is minimized by recovering the circulating energy to the source. The principle of operation, design consideration and experimental result, including efficiency, are presented in the case of large variation of the input voltage or load. A proposed 1kW converter prototype is compared with a PS-FB converter.