• The Transactions of the Korean Institute of Power Electronics
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• v.7 no.4
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• pp.332-338
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• 2002

High current coil power supply for superconductivity coil of tokamak requires fast dynamics performance of di/dt and smooth change over of current direction. To meet the specification high performance DSP-based controller Is designed for 12-pulse thyristor dual converter with interphase transformer(IPT). Not only the total current of Y and $\Delta$ converter units but also the difference for those should be regulated fast and accurately. Proportional and integral controller is designed for current difference control and the controller output is compensated to $\Delta$ converter. The source voltage phase angle detection and gate pulse generation algorithm are implemented in software for higher reliability of current control. The current error Is reduced by selection of appropriate initial gating angle during the transient of change over of current direction between thyristor converters.

• Proceedings of the KIPE Conference
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• 2019.07a
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• pp.267-268
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• 2019

제안하는 모듈을 기반한 고승압 및 고용량 DC/DC 컨버터는 직류 탭리액터를 인터리브드 형태와 결합한 승압형 컨버터를 모듈화하여 변압기 턴비를 작게 할 수 있고 스택을 통해 고승압에 유리하다. 연료전지 응용분야에 적용가능하며 추후 양방향제어를 통하여 전기자동차와 같은 견인구동 응용분야에도 적용할 수 있는 장점이 있다.

• The Transactions of the Korean Institute of Power Electronics
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• v.8 no.6
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• pp.551-560
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• 2003

This paper summarizes development of a 10KW stand-alone power processing unit for 5KW SOFC-low voltage battery hybrid fuel cell power generation system. The power processing unit Includes three parts a high frequency DC-DC converter boosts low fuel cell voltage, a DC-AC inverter converts a dc voltage into a regulated ac voltage and a bidirectional DC-DC converter charges or discharges the battery. The converter topology, design, control method, and experimental result arc presented to meet the specifications such as efficiency of 90% and cost of $40/KW laid down for the "2003 Future Energy Challenge Competition" organized by the U.S. Department of Energy and IEEE. and IEEE.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.18 no.5
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• pp.61-68
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• 2004

Recently, a fuel cell is remarkable for new generation system. The fuel cell is characterized by low voltage and high current. Therefor, for connecting to general load, it needs both a step up converter and an inverter. The proposed system consists of an isolated DC-DC converter to boost the fuel cell voltage to 380[Vdc] and a PWM inverter with LC filter to convert the dc voltage to single phase 220[Vac]. Also, bi-directional DC-DC converter for fuel cell generation system is composed to improve load response characteristic. In this paper, full bridge converter and the single phase inverter are designed and installed for fuel cell. Simulation and experiment verify that fuel cell generation system could be applied for the distributed generation.

• Proceedings of the KIEE Conference
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• 2006.07b
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• pp.998-999
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• 2006

포항가속기 연구소의 선형가속기에는 22개의 솔레노이드 전자석, 16개의 사극전자석 그리고 전자빔의 궤도 조절을 위한 16개의 2극 전자석이 있다. 선형가속기의 빔을 저장링으로 공급해주는 빔 전송선에는 22개의 사극전자석과 13개의 빔 궤도 조절용 이극 전자석이 있다. 전자빔의 정밀 제어를 위하여 전자석의 전원장치는 출력전류 분해능은 16bit 이상이고 출력전류의 안정도는 최대출력에 대하여 ${\pm}50ppm$ 이하의 고정밀 고안정도가 요구된다. 이를 위하여 풀-브릿지 4상한 DC/DC 컨버터를 이용한 전자석전원장치를 개발 하였다. 전원장치의 입력전압 직류 40V이고 출력전류는 단방향 전원장치는 최대 50A/50V 이고 양방향 전원장치는 ${\pm}20A/20V$이다. 스위칭 주파수는 50 kHz이다. 전원장치의 출력부에 필터가 없으면 출력전류에는 스윗칭과 관련된 주파수 성분이 포함 되고 전자빔은 이들 주파수 성분에 대하여 영향을 받게 된다. 이러한 이유로 출력 필터의 cut-off 주파수는 5 kHz 이하가 되어야 한다. 본 논문에서는 고정밀 고안정 스윗칭 전자석전원장치를 위한 출력필터의 설계, 제작 그리고 이를 적용한 전자석전원장치에 대하여 논의 하고자 한다.

• Proceedings of the KIPE Conference
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• 2016.07a
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• pp.71-72
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• 2016

Vehicle-to-grid (V2G) 시스템에서의 전기자동차는 계통의 에너지 저장장치로서 이용되는데 여기서 계통과 전기자동차의 에너지 교환을 위해서는 양방향 컨버터가 필요하다. 이 논문에서는 BSS-FBC (Bidirectional Single-Stage Full-Bridge Converter)를 이용하여 V2G가 가능한 전기자동차용 11kW급 OBC를 설계하였다.

• Proceedings of the KIPE Conference
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• 2016.07a
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• pp.405-406
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• 2016

A bidirectional secondary LLC resonant converter with auxiliary switches and an additional inductor is proposed to achieve the high gain characteristics of LLC resonant convertors. Auxiliary switches, an additional inductor and a resonant capacitor are connected in the high voltage secondary side of the proposed converter. The ac analysis and operating characteristics of bidirectional secondary LLC resonant converter are investigated. A 1kW prototype bidirectional secondary LLC resonant converter connected to the $400V_{DC}$ buses is designed and tested to confirm the validity and applicability of the proposed converter.

• Proceedings of the KIPE Conference
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• 2011.11a
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• pp.165-166
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• 2011

양방향 AC/DC 컨버터를 이용하여 EV배터리를 충전하거나 계통으로 전력을 보낼 때 PI제어기를 사용하면 임피던스를 예측할 수 없으므로 초기 구동시 오버슈트가 발생하여 회로에 스트레스가 발생한다. 본 논문에서는 Sliding Mode Controller (SMC)를 이용하여 계통으로 전력을 전달하는 알고리즘으로 소프트 스타트를 하는 알고리즘을 제안하였다. 시뮬레이션을 통하여 회로를 구성하고 제안한 제어 방법의 성능을 확인하였다.

• Proceedings of the KIPE Conference
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• 2011.11a
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• pp.157-158
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• 2011

This paper deals with the minimization of switching loss of a dual full-bridge bidirectional DC-DC converter for supercapacitor. In case of charging mode the switching loss can be minimized with proper switching pattern, and the switching loss in discharging mode can be minimized with soft switching. Simulation results show that the switching loss is reduced considerably.

• Proceedings of the KIPE Conference
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• 2007.11a
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• pp.21-23
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• 2007

In this paper a high efficiency bi-directional DC-DC converter for hybrid vehicles is proposed. The proposed converter a three-phase half-bridge interleaved ZVS converter, is designed to have high efficiency in the main operation range. The component ratings are calculated, the actual devices are selected, and the efficiency analysis has been performed to determine optimal ZVS range. The input and output current ripples are significantly reduced due to the interleaved operation. The dual loop control for the interleaved three-phase converter is also presented. To confirm the proposed convert ter, The simulation and experimental results are presented.