단상 하프-브리지 부스트 컨버터에서 DC 전해 커패시터의 고장예측 모니터링

Abstract

DC electrolytic capacitor is widely used in the power converter including PWM inverter, switching powersupply and PFC Boost converter system because of its large capacitance, small size and low cost. In this paper, basiccharacteristics of DC electrolytic capacitor vs. frequency is presented and the real-time estimation scheme of ESR andcapacitance based on the bandpass filtering is adopted to the single phase boost converter of uninterruptible powersupply to diagnose its split dc-link capacitors. The feasibility of this real-time failure prediction monitoring system isverified by the computer simulation of the 5[kW] singe phase PFC half-bridge boost converter.