높은 공통모드 전압을 가지는 컨버터회로에서 인덕터 전류 측정방법

A lossless inductor current sensing method for power converters with high common mode voltage such as a power factor correction(PFC) circuit is presented. The conventional DCR current sensing method is low cost and simple. However, this can not be used for the converters with high common mode voltage. In order to overcome this problem, an improved method using a voltage divider in proposed. The efficacy of proposed circuit is verified through the simulation and experimental results for the PFC circuit.