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서재현(J. H. Seo),김만고(M. G. Kim) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
An electronic step-down transformer is proposed. Conventional iron cored transformer is heavy and bulky and it has substantial amount of no load loss. On the other hand, electronic transformer can provide negligible no load loss, small size, and light weight. It consists of rectifier and PWM inverter. The output voltage is controlled by duty ratio. To confirm the validity of the proposed transform, simulation and experimental results are presented.
서재현(J. H. Seo),김만고(M. G. Kim) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
A coreless electronic transformer is proposed. Conventional iron cored transformer is heavy and bulky and it has substantial amount of no load loss. On the other hand, electronic transformer can be made of negligible no load loss and is small size and lightweight. It consists of rectifier and PWM inverter. Electronic transformer is easily modeled to conventional Buk converter; therefore, output voltage is controlled by duty ratio. It is thought to be suitable for applications where the operation duty is low. In this paper, detailed analysis and experimental result are presented.
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김만고,변기식,김남호,신춘식,이형기 釜山工業大學校 1995 論文集 Vol.37 No.-
A hybrid circuit for the closed-loop control of step motors that avoids encoder position sensor is presented. The operation of the circuit is illustrated by application of the controller to a variable reluctance(VR) type step motor. Because the stator winding induction is a function of rotor position, the current rise time in a chopper drive is used to determine rotor position and phase switching. The paper includes discussion of how the techniques can be applied to closed-loop step motor control.