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김만고(Marn-Go Kim),정영석(Young-Seok Jung) 전력전자학회 2009 전력전자학술대회 논문집 Vol.2009 No.1
A novel soft-switching two-switch flyback converter is proposed in this paper. This converter is composed of two-active power switches, a flyback transformer, a blocking diode, and two passive regenerative clamping circuits. The proposed converter has the advantages of a low cost circuit configuration, a simple control scheme, a high efficiency, and a wide operating range. The circuit topology, analysis, and experimental results of the new flyback converter are presented.
A High-Efficiency Two-Switch Flyback Converter with Energy Recovery Snubbers
Marn-Go Kim(김만고),Young-Seok Jung(정영석) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7
A novel soft-switching two-switch flyback converter is proposed in this paper. This converter is composed of two active power switches, a flyback transformer, and two passive regenerative clamping circuits.The proposed converter has the advantages of a low cost circuit configuration, a simple control scheme, a high efficiency, and a wide operating range. The circuit topology and experimental results of the new flyback converter are presented.
Time-Delay Effects on DC Characteristics of Peak Current Controlled Power LED Drivers
Marn-Go Kim(김만고),Young-Seok Jung(정영석) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
New discrete time domain models for the peak current controlled (PCC) power LED drivers in continuous conduction mode include for the first time the effects of time delay in the pulse-width-modulator. Realistic amounts of time delay are found to have significant effects on the average output LED current and on the critical inductor value at the boundary between two conduction modes. Especially, the time delay can provide an accurate LED current for the PCC buck converter with a wide input voltage. The models can also predict the critical inductor values at the mode boundary as functions of the input voltage and the time delay.
김만고(Marn-Go Kim),김진환(Jin-Hwan Kim) 전력전자학회 1997 전력전자학술대회 논문집 Vol.1997 No.-
The main swi tch of high-frequency boost converter may be failed because the high<br/> switching current or voltage can damage this switch. The high switching stress can be reduced by snubber circuit,<br/> In this paper, a new passive snubber circuit which can recover trapped snubber energy without added control is proposed for boost converter. The control of boost converter wi th proposed snubber is the same as the conventional one, In addition,<br/> the energy recovery circuit can be implemented wi th a few passive components.<br/> The analysis for proposed circuit is presented, and the validity of the circuit is verified through simulation and experiment.
Analysis and Experiment of Peak Current Controlled Buck LED Driver
Marn-Go Kim(김만고),Young-Seok Jung(정영석) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
Realistic amounts of time delay are found to have significant effects on the average output LED current and on the critical inductor value at the boundary between the two conduction modes. Especially, the time delay can provide an accurate LED current for the peak current controlled (PCC) buck converter with a wide input voltage. Experimental results are presented for the PCC buck LED driver with constant-frequency controller.
Two-transistor 포워드 컨버터에서 소프트 스위칭 기법의 손실 계산
김만고(Marn-Go Kim) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
Loss analyses of two soft switching techniques for two-transistor forward converters are presented. The sums of snubber conduction and capacitive turn-on losses for two transistors are calculated to compare the losses of two techniques. While the conventional soft switching technique shows the loss difference between two transistors, proposed soft switching technique shows equal as well as lower loss in two transistors.