• 전력전자학회논문지
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• 제22권1호
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• pp.36-43
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• 2017

This paper describes a hybrid multi-output three-level DC/DC converter suitable for a wide, high-input voltage range of an auxiliary power supply for a high-power photovoltaic generating system. In a high-power photovoltaic generating system, the solar panel output voltage depends on solar radiation quantity and varies from 450Vdc to 1100Vdc. The proposed hybrid multi-output three-level DC/DC converter, which is an auxiliary power supply, would be used as power source for control printed circuit boards and relay and cooling fans in a high-power photovoltaic generating system. The proposed multi-output ($24V_{DC}/30A$, $230V_{DC}/5A$) hybrid three-level boost converter, which uses an energy recovery snubber, is controlled by variable-frequency and phase-shifted modulations and can achieve zero-voltage switching with all operating conditions of input voltage and load range. Experimental results of a 2kW prototype are evaluated and implemented to verify the performance of the proposed converter.

• 조명전기설비학회논문지
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• 제12권1호
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• pp.117-125
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• 1998

본 논문에서는 전류시 유도전동기의 누설 인덕턴스 및 직류 링크 인덕터에서 발생하는 손실과 스너버 회로에서 발생하는 손실을 효과적으로 전원 및 부하로 회생하는 새로운 VCC-3를 제안하였으며, VCC-1, VCC-2 및 VCC-3를 3상 유도전동기에 적용하여 부하의 입·출력 특성과 궤환량 등을 측정, 비교·검토한 결과, VCC-3 방식의 GTO CSI가 효율개선 및 안전성 면에서 우수하다는 것을 입증하였다.

• 전력전자학회논문지
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• 제6권1호
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• pp.64-73
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• 2001

영전압 영전류 스위칭 3레벨 DC/DC 컨버터를 제안한다. 이 컨버터는 높은 순환 에너지, 정류다이오드들의 제한적인 기생순환, 그리고 내부 스위치에 의한 제한된 영전암 스위칭 부하뜰 갖는 일반적인 영전압 영전류 스위칭 3레벨 DC/DC 컨버터 약점을 극복한다. 본 논문에서 제안된 컨버터는 외부스위치가 영전압 스위칭을 이룰 수 있도록 하고 1차 측에 플라잉 커패시터로 위상전이 제어하도록 되었다. 또 컨버터는 내부 스위치플이 영전류 스위칭을 이루는 구간동안 l차 측에 에너지 회생 스너버에 의해 리셋 하는 보조회로를 갖는다. 제안된 컨버터들은 6kW, 30kHz 의 실험 장치를 제작하였고 해석하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1998년도 Proceedings ICPE 98 1998 International Conference on Power Electronics
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• pp.1042-1046
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• 1998

A new soft switching isolated bi-directional phase shifted pulse width modulation (PSPWM) dc/dc converter is presented. Due to the use of the energy recovery snubber, the isolated bi-directional PSPWM dc/dc converter has a significant reduction of switching losses in the switching devices of the primary and secondary side bridge, respectively. The proposed soft switching bi-directional PSPWM FB dc/dc converter provides an energy recovery snubber which consists of two fast recovery diodes, a resonant capacitor and a resonant inductor. The complete operating principles and simulation results will be presented.

• Journal of Power Electronics
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• 제4권4호
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• pp.237-245
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• 2004

In this paper, a two-switch high frequency flyback transformer linked zero voltage soft switching PWM DC-DC power converter implemented for distributed DC- feeding power conditioning supplies is proposed and discussed. This switch mode power converter circuit is mainly based on two main active power semiconductor switches and a main flyback high frequency transformer linked DC-DC converter in which, two passive lossless quasi-resonant snubbers with pulse current regeneration loops for energy recovery to the DC supply voltages composed of a three winding auxiliary high frequency pulse transformer, auxiliary capacitors and auxiliary diodes for inductive energy recovery discharge blocking due to snubber capacitors are introduced to achieve zero voltage soft switching from light to full load conditions. It is clarified that the passive resonant snubber-assisted soft switching PWM DC-DC power converter has some advantages such as simple circuit configuration, low cost, simple control scheme, high efficiency and lowered noises due to the soft switching commutation. Its operating principle is also described using each mode equivalent circuit. To determine the optimum resonant snubber circuit parameters, some practical design considerations are discussed and evaluated in this paper. Moreover, through experimentation the practical effectiveness of the proposed soft switching PWM DC-DC power converter using IGBTs is evaluated and compared with a hard switching PWM DC-DC power converter.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.I
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• pp.635-638
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• 2005

An energy recovery sustaining driver with zero current switching to reduce switching losses and EMI is presented in this paper. The driver with designed snubber circuits reduces ringing voltage significantly on PDP so that the voltage rating of MOSFETs can be lower as well to reduce the cost of switches.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2002년도 추계학술대회 논문집
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• pp.133-136
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• 2002

This paper presents m improved soft switching Buck converter using an energy recovery snubber which is composed of a tapped inductor, two snubber capacitors and three snubber diodes. The proposed Buck converter achieves zero voltage turn-of in the main power switch md freewheeling diode. The operating Principle of the Proposed Buck converter is described through the simulation, relevant equation and analysis.

• 전력전자학회논문지
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• 제21권1호
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• pp.10-18
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• 2016

In this study, an efficient clamp is proposed to reduce the switch voltage stress of a forward converter. The proposed clamp consists of a conventional LC snubber, a tertiary winding, and a diode. When the switch is turned OFF, the magnetizing inductor energy of the transformer is recovered directly into the flyback output, which is the tertiary winding and diode network, instead of circulating in the LC snubber. Therefore, switch voltage stress and circulating current caused by the magnetizing inductor energy are reduced. This condition improves the efficiency of the forward converter with limited switch voltage stress. A theoretical analysis and the design guidelines of the proposed converter are provided. Experimental results are also reported.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2016년도 전력전자학술대회 논문집
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• pp.403-404
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• 2016

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 F
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• pp.2169-2171
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• 1998

In order to improved the three phase GTO CSI of high efficiency IM drive with low loss commutation and snubber energy, we studied the energy recovery circuit to recover stored energy in clamping capacitor, dc link inductor and snubber capacitor, used an induction motor as the load of inverter. Specially, we investigated how dc input power is increased or decreased according to size of dc link inductor. The validity of this system is proved through experiment.