• Proceedings of the KIPE Conference
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• 2010.07a
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• pp.19-20
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• 2010

본 논문에서는 3상 AC-DC Boost 컨버터를 이용한 상용차 용 배터리 충전장치를 제안한다. 논문에서 제안한 3상 AC-DC Boost 컨버터는 SVPWM 방식을 적용하였으며, ${V_q}^*$ 전압으로 전압 제어기에 보상하여 오버슈트를 개선하였으며. 정 전류 제어와, 정 전압 제어를 통하여 배터리를 충전을 수행하였다.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1163-1164
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• 2011

Cascaded H-bridge 멀티레벨인버터의 구동을 위해서는 독립된 입력전압원의 확보가 필요하다. 본 논문에서는 이러한 Cascaded H-bridge 멀티레벨 인버터의 구조적 제약을 극복하기 위해 Buck-boost 컨버터와 Flyback 컨버터의 결합을 이용한 단일입력전원 구동 방법을 제안한다. 제안된 회로의 이론적 분석을 수행하고 시뮬레이션을 통하여 타당성을 검증한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.5
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• pp.1155-1161
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• 2014

This paper proposes a start-up voltage generator for reducing the minimum input supply voltage of DC-DC boost converters to 250mV. The proposed start-up voltage generator boosts 250mV input voltage to over 500mV to charge the capacitor for starting the boost converter. After the boost converter operates initially with the supply voltage charged in the capacitor, it uses its boosted output voltage for the supply voltage. Therefore, after the start-up operation, the proposed DC-DC boost converter works as the same as the conventional one. The proposed start-up voltage generator reduces the threshold voltage of the transistors by adjusting the body voltage at a low input voltage. This causes the higher clock frequency and the larger current to a Dickson charge-pump for boosting the input voltage. The proposed start-up voltage generator was implemented with a $0.18{\mu}m$ CMOS process. Its clock frequency and output voltage were 34.5kHz and 522mV at 250mV input voltage, respectively.

• The Transactions of the Korean Institute of Power Electronics
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• v.12 no.5
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• pp.394-399
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• 2007

In this paper, we study on a novel Buck-Boost converter of high efficiency by soft switching method. The proposed Buck-Boost converter is applied to new soft switching method in restraint of increment of switching power loss in the conventional Buck-Boost converter. The soft switching circuit is designed to modification of a energy storage inductor and a snubber circuit used by the conventional converter, and then the proposed converter is simplified. The controlling switches of the proposed converter is operated with soft switching by a partial resonance behavior. The output voltage of the converter is regulated by PWM control technique. The discontinuous mode action of current flowing into inductor makes to simplify control method and control components. The proposed Buck-Boost converter is compared with the conventional converter. Some computer simulative results and experimental results are confirmed to the validity of the analytical results.

• The Transactions of the Korean Institute of Power Electronics
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• v.13 no.2
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• pp.79-87
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• 2008

Boost Converters have been used to step up and regulate the low and widely varing voltage from the fuel cell. A transformer-less boost converter which does not have lossy, bulky, and costly high frequency transformers has an advantage in applications where galvanic isolation is not required. In this paper a new transformer-less boost converter is proposed. The proposed boost converter has practically usuable 6 to 8 times of step up ratio and is suitable for fuel cell applications due to very low input and output current ripples. The proposed converter is verified through the theorical analysis, simulation and experimental waveform.

• The Transactions of the Korean Institute of Power Electronics
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• v.11 no.2
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• pp.149-158
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• 2006

A soft-switching scheme for the PWM boost converter, ZCT (Zero current transition : ZCT) boost converter Is newly proposed to obtain the desirable features of both the conventional BWM boost and resonant converters such as easy of control, reduced switching losses and stresses, an4 low EMI. In order to achieve the soft-switching action, the proposed scheme employs an auxiliary circuit, which is added to the conventional boost converter and used to achieve soft-switching for both the main switch and the output diode while not incurring any additional losses due to auxiliary circuit itself. The basic operations, in this paper, we discussed and design guidelines are presented. Through a 100kHz, 60-W prototype, the usefulness of the proposed scheme is verified.

• Proceedings of the KIEE Conference
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• 1999.11b
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• pp.378-380
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• 1999

Interleaved dual boost 컨버터는 전력분배 시스템에서 입력 전류 리플을 줄이고 스위칭 손실을 줄일 수 있고, 필터 없이 입력라인 고조파 성분을 줄일 수 있으며, 더불어 역률 개선의 효과를 이룰 수 있다. 본 논문에서는 Interleaved Dual Boost(IDB) 컨버터를 운전하는 경우에 있어서 상태 공간 평균화법을 사용하여 소 신호 해석을 수행하였다. 그 해석 결과로 얻진 제어 전달 함수를 바탕으로 IDB 컨버터에 적합한 수 개의 제어기를 설계하였다. 시뮬레이션을 행한 결과로 얻어진 여러 가지 제어기 타입의 각 특성을 분석하고 그 중 IDB 컨버터로 가장 적절한 제어기를 제안하였다.

• Journal of the Korean Institute of Telematics and Electronics T
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• v.36T no.3
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• pp.56-63
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• 1999

In this paper, we realize the active PFC(Power Factor Correction) system of BF (Boost Forward) converter with PWM-PFM control technique to control DC output voltage, and to control the input current with sinusoidal wave synchronized by the converter and inverter using power switching element, FET and IGBT. The control circuit of the suggested Boost converter is implemented with a microprocessor 80C196. After making the ratio of output voltage to current as 50V/1A and the duty ratio greater than 0.5. When input voltage is 30V and boost inductance is 1.1mH. We control the voltage changing rate according to the variation of load resistance using a PWM-PFM control technique. And finally we prove experimentally. PF can be improved up to 0.96 using the current shaping technique.

• The Transactions of the Korean Institute of Power Electronics
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• v.12 no.1
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• pp.56-64
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• 2007

Recently, the high frequency link boost DC/DC converter has been used widely for PCS (Power Conditioning System) because of the requirements of small size and low cost. However, the high frequency link boost DC/DC converters applied the conventional voltage-fed converter and current-fed converter have some problems like high conduction losses and high surge voltage due to high circulating current and leakage inductance, respectively. To improve these problems, a novel secondary LLC (called SLLC) series resonant converter is proposed in this paper and its theoretical analysis, its operating waveforms, simulation and experimental results for a boost DC/DC converter using SLLC series resonant topology verifies the proposed topology. 800W experimental prototype is tested.

• Proceedings of the KIPE Conference
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• 2013.11a
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• pp.149-150
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• 2013

비반전 승강압형 토폴로지인 Cascaded Buck-Boost는 크게 Buck단과 Boost단으로 나눌 수 있다. 2상 병렬로 연결되는 Cascaded Buck-Boost 컨버터는 병렬로 연결되는 소자에 따라서 총 3가지의 회로 구성이 가능하며, 제어방법에 따라 1개의 스위치로도 Interleaved 회로처럼 동작이 가능하다. 본 논문에서는 각각의 Cascade Buck-Boost 컨버터의 병렬 구성에 따른 입출력 전압비, 전류리플, 시스템 효율 등을 분석한다.