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윤길문(Kil-Moon Yoon),이근호(Geun-Ho Lee),장철호(Cheol-Ho Jang),이제필(Jae-Pil Lee),나승호(Seung-Ho Na) 전력전자학회 1999 전력전자학술대회 논문집 Vol.- No.-
In this paper, a method to identify the equivalent circuit parameters of an induction motor is described. The method uses the current control in the rotational coordinate and compensates the effects of dead time and Inverter non-linearity. So it don't need the voltage sensor for motor input voltage and the speed sensor. For mutual inductance, wbich is sensitive to the injected current and frequency, the method uses the flux saturation<br/> characteristics of induction motor and provides the wide reliability. The performance of the proposed method is proved by experimental results
ZVS-FB PWM DC/DC 변환기의 동특성 해석 및 제어기 설계
이득기,윤길문,차영길,김흥근 전력전자학회 1998 전력전자학회 논문지 Vol.3 No.3
본 논문에서는 대용량에 적합한 영전압 스위칭 전브리지 PWM 직류/직류 변한기의 동특성 해석과 제어 루프의 설계에 대해 논하였다. 전압을 제어하기 위한 위상전이제어의 효과와 영전압 스위칭을 위한 변압기의 누설인덕턴스, FET의 적합 커패시턴스의 이용효과를 고려한 소신호 모델을 유도하였다. 이 소신호 모델은 PWM 벅 변환기의 등가모델에 시비율 변조에 대한 두 개의 종속 전원을 추가함으로써 모델링할 수 있다. 소신호 해석 결과를 근거로 하여 2-극점, 1-영점 보상회로를 사용한 전압제어기를 설계하였다. 설계된 제어기의 타당성을 검증하기 위해서 개루프 시스템과 폐루프 시스템의 소신호 해석결과를 비교하였으며, 2kW급 부하실험으로 설계한 전압제어기의 동특성이 우수함을 실험적으로 입증하였다. This paper presents the dynamic analysis and control loop design of a zero voltage switching full bridge (ZVS-FB) PWM DC/DC converter. The small-signal model is derived incorporating the effects of phase shift control and the utilization of transformer leakage inductance and power FET junction capacitance to achieve zero voltage resonant switching. These effects are modeled by introducing additional feedforward and feedback terms for duty cycle modulation. Based on the results of the small-signal analysis, the control loop is designed using a simple two-pole one-zero compensation circuit. To show the validity of the design procedures, the small signal analysis of the closed loop system is carried out and the potential of the zero voltage switching and the superiority of the dynamic characteristics are verified through the experiment with a 2 kW prototype converter.
위상 검출기 편차 보상 알고리즘을 이용한 PWM컨버터 성능개선
이근호(G.B. Lee),윤길문(K.M. Yoon),정연우(Y.W. Jung),김한종(H.j. Kim),이제필(J.P. Lee) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
In the 3-phase PWM converter, accurate detection of the supplied voltage phase is very important. But a detecting circuit cannot avoid generating the deviation of phase detector so that we need to compensate it. In this paper, an accurate and simple compensating method of deviation of phase detector is proposed.
장철호(C.H. Jang),이근호(G.H. Lee),허재영(J.Y. Hur),강동우(D.W. Gang),윤길문(G.M.Yoon),신정기(J.G. Shin),이제필(J.P. Lee) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
Line starting using contactors is a conventional method for escalator system Recently, comsumer's requirements for energy saving and variable functions are increasing To satisfy this demands, LG Industrial Systems Co., Ltd. has developed an escalator which is driven by inverter system.<br/> In this paper, technical schemes of the developed escalator are introduced and the performance of the proposed system is proved by experiment.