• Proceedings of the KIPE Conference
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• 2007.07a
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• pp.533-535
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• 2007

The design of tunned filters for six-pulse thyrister converter is discussed. For electrolyzer system, the design procedure of tunned filters of AC 14.4kV power system are proposed by dynamic simulation. It is shown that these harmonic filters can meet most operational requirments. By careful specification of the transformer reactance, very low harmonic content and high power factor may be achieved at a specific operating point. The the proposed design procedure is verified with the simulation results.

• Proceedings of the KIPE Conference
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• 2017.07a
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• pp.355-356
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• 2017

In this paper, a highly isolated DC-DC converter is designed as a power supply, and an insulator-molded transformer is used to achieve high insulation performance. Finally, the insulation performance of the power supply was verified by experimental results.

• Proceedings of the KIEE Conference
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• 2000.11b
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• pp.365-367
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• 2000

Recently, the power supply equipments have tendency to take multiple feedback loop paths. In this paper, the state space averaging technique is applied for the analysis of flyback type current mode control circuit. We made real converter for the gurantee of stable output characteristic and proper design of feedback circuit. The validity of proposed method is verified from test results. The improvement of stability is confirmed by sinusoidal signal injection method with isolated transformer. It is known that phase margin is sufficient and gain crossover frequency $f_c$ is nearly 1/5 of switching frequency $f_s$ from the experimental result with frequency response analyzer.

• Proceedings of the KIPE Conference
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• 2001.07a
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• pp.608-611
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• 2001

This paper is indicating the problems, which are the conduction loss on the high frequency transformer, the protection of rectification diode as the snubber loss and the stress of switching main devices, as be made high current and high speed in the phase-shift switching full-bridge DC-DC converter is used the power supply's main circuit of high capacity. In this paper, to improve those problems, it is proposed that is the resonant circuit auxiliary can be reduced conduction losses and stabilized output control. And, it is constructed prototype of the power supply as the result of computer simulations.

• Proceedings of the KIPE Conference
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• 2002.11a
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• pp.103-107
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• 2002

A contact-less power supply system (CPS) allows electrical energy to supply to mobile consumers without any electrical or mechanical contact. CPS works in the same principle as a transformer, with the track litz cable forming the primary circuit and the pickup as the secondary. The track power supply generates the high frequency alternating current in the track cable. The captured AC magnetic field generated by the track conductors produces electrical energy in the pickup coil and the pickup rectifier converts the high frequency AC power to DC while regulating the power to the load. This paper presents the theoretical analysis, simulation and experiment리 results of the series-parallel resonant converter working as contact-less power supply system.

• Proceedings of the KIPE Conference
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• 2012.07a
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• pp.460-461
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• 2012

플라이백 컨버터는 SMPS의 전원회로 중 가장 많이 쓰이고 있는 컨버터이다. 최근 들어 원가 절감을 위한 Primary Side Regulation(이하 PSR)기술이 활발히 진행 중이다. 이 기술의 단점 중 하나는 직접적으로 제어하는 전압이 출력전압이 아니라 보조권선 전압이므로 변압기 커플링에 따라 실제출력전압에 약간의 오차가 생길 수도 있다는 것이다. 본 논문은 이를 감안하여 플라이백 컨버터의 트랜스포머를 기존의 방식들이 아닌 동축권선 방식을 적용하여 만듦으로써 보다 우수한 커플링으로 인해 출력전압의 오차가 거의 없음을 보여준다. 간단한 PSR의 원리에 대해 설명하고 커플링 계수를 비교한 후 UC3844를 이용한 Flyback converter를 이용하여 검증하였다.

• 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.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.58 no.11
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• pp.2185-2191
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• 2009

Wind power and photovoltaic(PV) generation systems are the fastest growing sources of renewable energy. The nonlinear devices, such as power electronic converter or inverter, of wind power and PV generation systems are the source of harmonics in power systems. The harmonic-related problems can have significant detrimental effects in the power system, such as capacitor heating, data communication interference, rotating equipment heating, transformer heating, relay misoperation and switchgear failure. There is a greater need for harmonic analysis that can properly maintain the power quality. By measuring harmonics of existing wind power and PV generation systems as harmonics modeling, the studies were made to see the harmonic impact of grid-connected wind power and PV generation systems.

• Proceedings of the KIPE Conference
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• 2010.11a
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• pp.30-31
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• 2010

Filament power supply (FPS) for neutral beam injection (NBI) consists of an insulation type is a device that heats the interior of Tokamak. The input/output specifications of FPS are 3-phase AC 200[Vpeak] and DC16V/300A respectively. A conventional FPS is composed of a 3-phase diode rectifier with DC-link, a H-bridge DC/DC converter, a high frequency transformer, a secondary rectifier and a LC-filter. In this paper, to improve the efficiency of PSFB DC/DC converter it is substituted IGBT devices instead of diode rectifier in secondary side. The proposed method is verified by computer simulation and experiment result.

• Journal of Power Electronics
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• v.19 no.2
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• pp.431-442
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• 2019

This paper proposes a unified high-frequency bipolar buck-boost (UHFBB) control strategy for a dual-active-bridge (DAB), which is derived from the classical buck and boost DC/DC converter. It can achieve optimized current stress of the switches and soft switching in wider range. The UHFBB control strategy includes multi-control-variables, which can be achieved according to an algorithm derived from an accurate mathematical model. The design method for the parameters, such as the transformer turns ratio and the inductance, are shown. The current stress of the switches is analyzed for selecting an optimal inductor. The analysis is verified by the experimental results within a 500W prototype.