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전도손실 저감 및 효율 상승을 위한 PWM DC-DC 컨버터의 특성
김영문(M. Y. Kim),김해재(H. J. Kim),김칠용(C. Y. Kim),류재엽(J. Y. Lyu),김수욱(S. W. Kim) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11
Presented increase and so on of switch stress and switching dissipation and EMI that is happened in general PWM converter and in this study to solve problem the resonance energy return to life rate and new active snubber PWM converter because do maximization. Active snubber PWM converter that try adds auxiliary switch and resonance capacitor, diode to existing converter under all switching conditions turn on/off Minimised switching dissipation that occur. Reduced harmonic components absorbing station recovery electric current that happen to snubber diode inserting diode and resistance. And decreased peak current that is happened in auxiliary switch arranging resonance capacitor and inductor properly. Certified effect that efficiency rises about 2.5 [%] more than existent PWM converter in rated load through an experiment.
김칠용(C. Y. Kim),문상필(S. P. Mun),김영문(M. Y. Kim),김해재(H. J. Kim),류재엽(J. Y. Lyu),김수욱(S. W. Kim) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11
This research presented the new zero-current switching pulse width modulation SEPP(Single Ended Push-Pull)high frequency inverter for solving the problem of the zero-current SEPP high frequency inverter circuit which is using widely in the practical application of an induction heating apparatus, the soft switching operation and power control are impossible when the lowest power supply in the zero-current switching pulse width modulation SEPP high frequency inverter. The inverter circuit which is attempted by on-off operation of a switch has the reduction effect of the power loss due to a soft switching and a high frequency switching. And it confirmed that the power regulation is possible continuously from 025[㎾] until 2.84[㎾] in the case the duty rate(D) changes from 0.08 to 0.3 under zero-current switching operating by a dissymmetry pulse width modulating control and the power conversion efficiency comes true the efficiency of 95[%]. Doe to the result above, the ZCS PWM SEPP high frequency inverter will be effective as sources of an induction heating apparatus.
새로운 유도가열용 ZCS PWM SEEP 고주파 인버터의 특성
김칠용(C. Y. Kim),문상필(S. P. Mun),김영문(M. Y. Kim),김해재(H. J. Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.11
This research presented the new zero-current switching pulse width modulation SEPP(Single Ended Push-Pull)high frequency inverter for solving the problem of the zero-current SEPP high frequency inverter circuit which is using widely in the practical application of an induction heating apparatus, the soft switching operation and power control are impossible when the lowest power supply in the zero-current switching pulse width modulation SEPP high frequency inverter. The inverter circuit which is attempted by on-off operation of a switch has the reduction effect of the power loss due to a soft switching and a high frequency switching. And it confirmed that the power regulation is possible continuously from 0.25[㎾] until 2.84[㎾] in the case the duty rate(D) changes from 0.08 to 0.3 under zero-current switching operating by a dissymmetry pulse width modulating control and the power conversion efficiency comes true the efficiency of 95[%]. Due to the result above, the ZCS PWM SEPP high frequency inverter will be effective as sources of an induction heating apparatus.
서기영(K.Y.Suh),김영문(Y.M.Kim),문상필(S.P.Mun),김주용(J.Y.Kim),이현우(H.W.Lee) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.-
In conventional three-phase rectifiers, it was necessary to use a transformer to obtain low output voltage, In this paper, we propose a characteristic experimental of three-phase diode rectifiers circuit that achieves low voltage by using a very simple circuit configuration that does not have a transformer and does not need any complex control. We also describe the operation principle of the proposed circuit, and derive a theoretical formula for its current waveform. On the basis these theoretical values with experimentally obtained input, output current characteristics, current amplification factor, and output voltage characteristics, allowed us to confirm the soundness of our theoretical analyses.<br/> <br/>