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PWM인버터의 출력 LC필터에 의한 공진전압 억제 기법
최경진(G.J. Choi),전태원(T.W. Chun),이홍희(H.H. Lee),노의철(E.C. Nho),김흥근(H.G Kim) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
The LC filter has been generally used to filter the output voltage of PWM inverter to the sinusoidal waveform. The resonant voltage on the output voltage of PWM inverter may be generated due to LC filter. This paper proposed the algorithm to damp the resonant voltage using the virtual resistor without decreasing the efficiency by the power loss in the real resistor. The method is appled to the vector controlled induction motor driven by the PWM inverter with the LC filter. The simulation results are carried out to verify the performances of the proposed algorithm.
필터커패시터 용량을 최소화한 100W급 조명용 LED 구동 AC/DC 컨버터
박해영(H.Y. Park),정재헌(J.H. Jung),김학수(H.S. Kim),노의철(E.C. Nho),김인동(I.D. Kim),김흥근(H.G. Kim),전태원(T.W. Chun) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
This paper describes a control method to minimize the filter capacitor of a AC/DC converter for LED driver. The rectified secondary voltage of the transformer has 120㎐ ripple unlike the conventional converter for the LED drive. Therefore, the filter capacitor can be minimized and this provides reduced cost, low switching loss, and long life of the converter.
다이오드 클램프형 3-레벨 IGBT 인버터를 위한 과전압 방지 스너버 회로
정재헌(J.H. Jung),송웅협(W.H. Song),노의철(E.C. Nho),김인동(I.D. Kim),김흥근(H.G. Kim),전태원(T.W. Chun),유동욱(D.W. Yoo) 전력전자학회 2009 전력전자학술대회 논문집 Vol.2009 No.1
This paper proposes a new snubber circuit for a diode-clamped 3-level IGBT inverter. The voltage spike at the instant of IGBT turn-off switching can be reduced considerably by the proposed scheme. The operation of the proposed snubber circuit is described and one pole of a 3-level IGBT inverter has been implemented. The simulation and experiment was carried out with 250V dc link voltage and 20A peak load current. The usefulness of the proposed snubber circuit is verified through experimental results.
정재헌(J.H. Jung),박해영(H.Y. Park),노의철(E.C. Nho),김인동(I.D. Kim),김흥근(H.G. Kim),전태원(T.W. Chun) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.11
This paper describes a new method for the seamless operation mode transfer of a PCS. The proposed method provides reduced STS turn off time and smooth mode change between current and voltage control of the PCS in case of line fault. The usefulness of the method is verified through simulations.
고효율, 저손실을 갖는 1단 교류/직류 변환기의 역률제어
류명효(M.H. Ryu),차영길(Y.K. Cha),최병조(B.C. Choi),김흥근(H.G. Kim) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
A new single stage AC/DC converter based on the forward converter is proposed. The proposed converter offers both the high power factor and the direct conversion from ac line to de output voltage. Also, the proposed converter reduces the diode conduction loss, so improves the overall efficiency of the converter, compared with other alternatives. The principles of operation and the simulation results of the proposed converter are presented. A 100 W prototype was built and tested to show the potential of applications of the proposed converter.<br/> <br/>
정재헌(J.H. Jung),손예(R. Sun),노의철(E.C. Nho),김인동(I.D. Kim),김흥근(H.G. Kim),전태원(T.W. Chun) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7
This paper describes a new method for the seamless operation mode transfer of a PCS. The proposed method provides reduced STS turn off time after line fault and smooth mode change between current and voltage control of the PCS. The usefulness of the method is verified through simulations.