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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.
슈퍼커패시터를 이용한 에너지 저장용 3㎾급 양방향 DC/DC 컨버터
송웅협(W.H. Song),김진영(J.Y. Kim),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 describers a bidirectional DC/DC converter for charging and discharging of a supercapacitor. Simulations are carried out to see the operation and performance of the 3㎾-rated converter. Simulation results show that the charging/discharging characteristics is sufficient for the compensation of the response delay of a fuel cell.
펄스모드 스위칭 직류전원 장치에 적합한 AC/DC 컨버터
문상호(S.H.Moon),노의철(E.C.Nho),김인동(I.D.Kim),김흥근(H.G.Kim),전태원(T.W.Chun) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
This paper describes a novel multilevel ac/dc power converter suitable for the protection of frequent output short-circuit. The output dc power of the proposed converter can be disconnected from the load within several hundred microseconds at the instant of short-circuit fault. The rising time of the de load voltage is as small as several hundred microseconds, and there is no overshoot of the dc voltage because the dc output capacitors keep undischarged state, Analysis and simulations are carried out to investigate the operation and usefulness of the proposed scheme
3상 전압변동발생기의 직렬변압기에 의한 전압강하 특성해석
송웅협(W.H. Song),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 deals with the SCR thyristor switching characteristics of a 3-phase voltage disturbance generator. The series transformers of the generator require bypass SCR thyristors to provide the source voltage to the output terminal in normal operating mode. The SCR thyristor switching characteristics is quite different according to the connection point to the series transformer. The switching characteristics is analysed and verified through simulation results.
마이크로그리드용 순간정전발생기의 순간정전모드 동작시 전류특성 해석
이영호(Y.H. Lee),민병호(B.H. Min),노의철(E.C. Nho),김인동(I.D. Kim),전태원(T.W. Chun),김흥근(H.G. Kim) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
This paper describes the current characteristics of outage generator for microgrid in outage mode operation. The outage can be generated with 3-phase voltage disturbance generator. The STS current becomes very huge during the first cycle of the outage, and the magnitude of the current depends on the time impedance, series transformer leakage inductance, interfacing reactor of PCS, and the maximum allowable PCS output current. The current and load voltage waveform are analysed through simulation.
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.
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.