• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 B
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• pp.1211-1213
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• 2003

A pulse width modulation(PWM) method for single-phase Sepic-type rectifier is introduced in this paper. The characteristics of the proposed PWM system are high performance high power factor with low input current harmonic distortion. The proposed control method is based on the average-current-mode using the dedicated integrated circuit UC3854 this technique it is possible to implement a very simple control circuit for unitary power-factor in CCM operation and also to provide over-current protection.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2005년도 춘계학술대회
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• pp.132-135
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• 2005

A modular photovoltaic PCS with high-frequency isolation is proposed. The proposed system consists of a SEPIC converter and a full-bridge inverter. Using the power slope versus voltage of the PV array, the MPPT controller is proposed that produces a smooth transition to the maximum power point. The disturbance of the line voltage is detected using a fast sensing technique. Experimental results obtained on a 500W prototype show high performance such as almost unity power factor, $90\%$ power efficiency, $3.6\%$ THD.

• 한국산업융합학회 논문집
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• 제23권2_1호
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• pp.139-147
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• 2020

In order to satisfy the voltage levels of the low voltage battery side and high voltage DC bus, a high voltage gain with bidirectional operation is required. In this system, the cost effectiveness of the design is a critical factor; therefore, the system should be designed using a small number of components. This paper propose a novel bidirectional converter composed with a quasi-sepic and switched-indictor network. The proposed converter consists a small number of components with a high voltage gain ratio. Detailed analysis are made with respect to the operating mode, number of components, voltage and current ripple and efficiency. To verify performance of the proposed converter, simulation was performed is this paper. The simulation results are shown to verify the feasibility and performance of the proposed bidirectional converter.

• Journal of Power Electronics
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• 제8권1호
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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.

• 신재생에너지
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• 제1권2호
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• pp.11-18
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• 2005

A modular photovoltaic PCS with high-frequency isolation is proposed. The proposed system consists of a SEPIC converter and a full-bridge inverter Using the power slope versus voltage of the PV array, the MPPT controller is proposed that produces a smooth transition to the maximum power point. The dc current of the PV array is estimated without using a dc current sensor The disturbance of the line voltage is detected using a fast sensing technique. Experimental results obtained on a 500W prototype show high performance such as almost unity power factor, $90\%$ power efficiency, $3.6\%$ THD.

• Journal of international Conference on Electrical Machines and Systems
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• 제2권2호
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• pp.202-215
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• 2013

This paper proposes a SEPIC-input, self-driven, active clamp ZVS converter, where an auxiliary winding and a RC delay circuit are employed to drive the active clamp switch and to achieve asymmetrical duty control without any other extra circuits. Based on the fixed dead time and the resonance between capacitors and inductors, both the main switch and the auxiliary switch can rule the ZVS operation. Detailed operation modes are presented to illustrate the self-driven and ZVS principles. Furthermore, an accurate state-space model and the transfer functions of the proposed converter have been presented and analyzed in order to optimize dynamic performance. The model provides efficient prediction of converter operations. Experimental results, based on a prototype with 80V input and 15V/20A output, are discussed to verify the transient and steady performance of the proposed converter.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2015년도 전력전자학술대회 논문집
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• pp.93-94
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• 2015

최근 자동차 조명시장에서 LED를 이용한 헤드램프 개발이 빠르게 이루어지고 있다. LED 헤드램프는 기존의 할로겐 앰프와 다르게 에너지 효율이 높으며, 헤드램프뿐만 아니라 차량 내부에 다양하게 활용이 가능하다는 장점을 갖는다. 현재 차량에 적용되어 있는 LED 헤드램프 대부분은 SEPIC을 이용한 LED전류제어를 한다. 이러한 경우 헤드램프의 효율은 SEPIC에 의해 대부분 결정이 되며, 부수적인 기능추가를 위해서는 보조 ECU가 추가적으로 필요하다. 따라서 본 논문에서는 차량용 헤드램프를 위한 DC/DC컨버터를 제안하고, 이에 대해 검증한다.

• 전력전자학회논문지
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• 제9권5호
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• pp.478-484
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• 2004

본 논문에서는 두 개의 무손실 스너버 셀을 제안하여 고주파에서 동작할 수 있는 컨버터를 일반화하였다. 컨버터 구현 시 스너버 셀의 선택은 컨버터 구조에 따라서 결정된다. 스너버 셀의 구성은 한 개의 포화 인덕터와 LC 공진회로, 두 개의 다이오드로 구성된다. 인덕터는 컨버터 주 다이오드의 역회복 손실을 저감시키는 역할을 하는데 포화 인덕터를 사용하면 셀 내의 공진 에너지를 감소시켜 컨버터가 고주파에서 동작될 수 있는 특성을 갖는다. 컨버터의 일반화는 무손실 스너버 셀을 벅(Buck), 부스트(Boost), 벅-부스트(Busk-Boost), 척(Cuk), 제타(ZETA) 및 세픽(SEPIC)에 추가하여 실현하였다. 제안된 컨버터의 고주파 동작 및 고효율 특성은 400 kHz, 125 W 부하에서 실험하여 기존의 PWM 컨버터에 비하여 고효율로 동작함을 확인하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2018년도 전력전자학술대회
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• pp.320-321
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• 2018

A non-isolated high voltage gain bidirectional DC-DC converter for battery storage system has been presented in this paper. The topology is composed of boost converter and traditional SEPIC converter. The proposed converter can achieve higher voltage conversion ratio with reduced voltage and current stresses in the switches. In additional, a reduced number of components are included in this topology. The PSIM simulation is carried to validate the analysis and operation of the converter.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2012년도 전력전자학술대회 논문집
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• pp.389-390
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• 2012

본 논문은 입력전류 리플이 없는 브릿지리스 세픽 컨버터를 제안한다. 제안된 컨버터는 브릿지 다이오드를 제거하여 도통손실을 줄이고 결합 인덕터와 보조 캐패시터를 사용하여 입력 전류 리플을 제거하였다. 제안된 회로의 동작원리를 설명하고, 시뮬레이션으로 확인한 후 130[W]급 하드웨어 프로토 타입을 이용하여 검증하였다.