• Proceedings of the KIPE Conference
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• 2015.07a
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• pp.165-166
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• 2015

본 논문은 새로운 단일전력변환 SEPIC(Single-Ended Primary-Inductor Converter)-ZETA 절연형 양방향 컨버터를 제안한다. 제안된 컨버터는 SEPIC과 ZETA 컨버터가 결합된 구조로 절연을 통해 안정성을 강화했고, DC측 리플 전류가 낮아 에너지 저장장치의 수명을 연장시킨다. 그리고 SEPIC 컨버터 모드(DC/AC)와 ZETA 컨버터 모드(AC/DC)에서의 입출력 전압비가 동일해 양방향 제어 알고리즘이 간단하다. 또한, 기존 two-stage 구성의 양방향 컨버터와 달리 회로가 단순하며, 단일전력변환을 통한 고효율 저비용의 장점을 가지고 있다. 본 논문에서는 이론적 해석 및 제안한 컨버터의 250W급 시작품을 이용한 실험결과를 통해 컨버터의 우수성 및 성능을 검증한다.

• 제어로봇시스템학회:학술대회논문집
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• 2002.10a
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• pp.74.4-74
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• 2002

$\textbullet$ Introduction $\textbullet$ Circuit modified $\textbullet$ Implement of the dual output converter $\textbullet$ Conclusions

• The Transactions of the Korean Institute of Power Electronics
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• v.9 no.5
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• pp.478-484
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• 2004

In this paper, two lossless snubber cells are proposed to generalize high frequency converter with losslless snubber. The selecting of snubber cells, which generalize high frequency converters, are depended on converter topologies. The cells have a saturable inductor, LC resonant tank and two diodes. In the cells, the saturable inductors extremely reduce resonant energy in the LC resonant tank. By minimizing resonant energy, the converter, which applies snubber cells, can operate at high frequency. These cells are applied for Buck, Boost, Buck-Boost, Cuk, ZETA, and SEPIC to generalize converter which have lossless snubber. The boost type converter has been implemented, with 400 kHz switching frequency for 125 W load to verify the converter characteristics.

• Journal of Power Electronics
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• v.8 no.1
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• pp.51-59
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• 2008

This paper addresses several issues concerning the analysis, design, modeling, simulation and development of single-phase, single-switch, power factor corrected AC-DC high frequency switching converter topologies with transformer isolation. A detailed analysis and design is presented for single-switch topologies, namely forward buck, flyback, Cuk, Sepic and Zeta buck-boost converters, with high frequency isolation for discontinuous conduction modes (DCM) of operation. With an awareness of modem design trends towards improved performance, these switching converters are designed for low power rating and low output voltage, typically 20.25W with 13.5V in DCM operation. Laboratory prototypes of the proposed single-switch converters in DCM operation are developed and test results are presented to validate the proposed design and developed model of the system.

• Proceedings of the KIEE Conference
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• 2006.07b
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• pp.933-934
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• 2006

본 논문에서는 새로운 양방향 ZVS PWM Sepic/Zeta 컨버터를 제안한다. 제안한 컨버터는 PWM 제어가능한 컨버터로서 입력과 출력전압의 극성이 같은 비반전 컨버터의 특징을 지니며 DC 전압의 전달함수가 양방향 모두 M=D/(1-D)로 동일하다. 또한 각방향으로 전력전달시 다이오드와 병렬로 연결된 MOSFET가 다이오드의 'ON'시 동시에 'ON'되어 Sychronous Rectifier로 동작하므로 도통손을 저감하였으며, Auxiliary Resonant Commutated Pole를 사용하여 저감된 스위칭 손실을 갖는 특성을 지니고 있다. 또한 Transformer 버전이 존재하므로 입력과 출력사잉에 전기적 절연을 필요로 하는 실제응용에 유용하게 사용할 수 있다.

• Journal of Power Electronics
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• v.16 no.5
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• pp.1669-1677
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• 2016

A new auxiliary circuit for boost, buck, buck-boost, Cuk, SEPIC, and zeta converters is introduced to provide soft switching for pulse-width modulation converters. In the aforementioned family of DC-DC converters, the main and auxiliary switches turn on under zero current transition (ZCT) and turn off with zero voltage and current transition (ZVZCT). All diodes commutate under soft switching conditions. On the basis of the proposed converter family, the boost topology is analyzed, and its operating modes are presented. The validity of the theoretical analysis is justified by the experimental results of a 100W, 100 kHz prototype. The conducted electromagnetic emissions of the proposed boost converter are measured and found to be lower than those of another ZCT boost converter.

• Proceedings of the KIPE Conference
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• 2017.07a
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• pp.16-17
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• 2017

하프-브리지 제타 컨버터는 간단한 구조와 넓은 영전압 스위칭 영역으로 인해 low-to-medium 용량 어플리케이션에 적합한 컨버터이다. 하지만 1,2차측의 큰 첨두 전류로 인해 큰 스위칭 턴-오프 손실과 역회복 손실 문제를 가지며, 이는 하프브리지 제타 컨버터의 고효율 획득을 어렵게 만든다. 본 논문에서는 하프-브리지 제타 컨버터의 동작을 분석하고 이를 통해 1,2차측 첨두 전류를 효과적으로 줄일 수 있는 방법에 대해 제안한다. 제안된 컨버터의 효과는 300-400V 입력전압과 56V/250W 출력을 갖는 prototype의 실험을 통해 검증된다.

• The KSFM Journal of Fluid Machinery
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• v.17 no.2
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• pp.41-47
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• 2014

Experimental results are given for the vertical motion of water in the water chambers for wave energy converter aligned along the wave propagation direction in order to avoid the impulsive wave forces. This paper mainly focuses on the property of the amplitude of the vertical motion of the water surface in the chambers. The amplification has been investigated by dimensionless parameters of wave period to resonance period ratio of the U-shaped oscillation, $T/T_r$, chamber size to wave length ratio, l/L, water depth to wave length ratio, h/L, amplitude of up-down motion of water particles to draft of the front wall ratio, ${\zeta}/D$. It has been shown that l/L should be less than 0.1 and as $T/T_r$ approaches unity the up-down of the water in the chambers is amplified. Also, the structure of the walls which form th water chambers has been examined roughly. It is deduced that the chambers set on both sides of the hull of a single-point moored floating vessel is preferable to those set along a fixed structure such as breakwaters.