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정현파 역기전력을 갖는 BLDC의 직접토크 제어에 관한 연구
김정수(J.S. Kim),김철우(C.U. Kim),조수억(S.E. Cho) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
This paper describe a control scheme for direct torque control of BLDC Motor. The proposed Luenberger Observer scheme calculate flux errors in order to control the torque and flux more correctly. This proposed control scheme has not the requirement of a separate current regulator and proportional-integral (PI) control of the flux and torque, there by improving transient performance and also has the advantage of less torque ripple in steady state with a fixed switching period. The effect of proposed method has been proven by simulations.
출력전압 레벨 수와 전류정격을 고려한 PWM 다중레벨 인버터
박노식(N-S Park),서종준(J-J Seo),박성준(S-J Park),김광헌(K-H Kim),조수억(S.E. Cho),김철우(C-U Kim) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
In this paper, we proposed the novel hybrid multi-level inverter using combination of the output voltage of transformers to reduce the THD(Total Harmonic Distortion) and improve the waveform of output voltage. The proposed multi-level inverter used the output of transformer which is 1times, 2times, 4times of input of the transformers. So we increased the output voltage from the reduce the number of switching component and transformer. Also, we tested the proposed prototype 15-level inverter to clarify the proposed electric circuit and reasonableness of control signal for the proposed multi -level PWM inverter.
전장건(J.G Jeon),조수억(S.E Cho),박노식(N.S Park),박성준(S.J Park),문채주(C.J Moon),권순재(S.J Kwon),김철우(C.U Kim) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
전력 반도체의 방열 특성은 수명 및 소손 과 관계가 있다. 전력 반도체 자체의 열전달 특성 및 전력 반도체가 취부 되는 방열판의 전도, 대류, 방사의 열전달 특성을 고찰하기 위하여 본 논문에서는 실시간으로 방열판의 온도를 관측하여 전력 반도체의 손실을 확인하였고, 프로파일별 히트 싱크 온도 상승 측정 평균 전류와 전류 프로파일과 의 상관 관계를 분석 하여 방열판 최적화 및 히트 싱크 온도 관측 시 히트 싱크의 모델을 제시하였다.
손경종(K.J Son),송성근(S.G Song),이상훈(S.H Lee),조수억(S.E Cho),박성준(S.J Park),김광헌(K.H Kim),문채주(C.J Moon) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
In this paper, an DC/DC converter system has been proposed, which is suitable for fuel cell based power generation systems. The proposed converter system has outstanding advantages over the conventional dc-dc converters with respect to high efficiency and high power density. The developed converter system has been experimentally tested with using DSP PWM controller so that the performance of the proposed converter could be effectively examined and the validity of the converter could be verified.
태양광 저에너지 출력을 위한 Buck, Boost 컨버터 구동방식
김병우(B.W. Kim),박성준(S.J. Park),김광헌(K.H. Kim),손무헌(S.M. Heon),조수억(S.E. Cho),김철우(C.U Kim) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
Normally, the buck converter is used for the charging converter of photovoltaic generator because this converter has good characteristics compare with boost and buck-booster converter. But, in case of the sollar-cell voltage is lower than charging voltage, we cannot charge the sollar energy to the charger. So, in this paper, we proposed the novel hybrid converter using by combination of buck and boost converter for the charging converter of photovoltaic generator, as a results, it can operate buck, boost and buck-boost mode. The proposed novel converter has the same characteristics of the existent buck converter and furthermore it can operate as a boost converter. So, we can make the more effective photovoltaic charging system.
우도(Yu Tao),문채주(C-J Moon),송성근(S-G Song),박성준(S-J Park),조수억(S.E. Cho),김종달(J-D Kim) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
In this paper, we proposed the electric circuit using one common arm of H-Bridge Inverters to reduce the number of switching component in multi-level inverter combined with H-Bridge Inverters and Transformers. and furthermore we suggested the new multi-level PWM inverter using PWM level to reduce THD(Total Harmonic Distortion). and we used the switching method that can be same rate of usage at each transformer. Also, we tested the proposed prototype 9-level inverter to clarify the proposed electric circuit and reasonableness of control signal for the proposed multi-level PWM inverter.