LCD 모니터의 어댑터를 위한 고역률 고효율 PFC AC/DC 컨버터

Abstract

Many single-stage PFC(power-factor-correction) AC/DC converters suffer from the high link voltage at high input voltage and light load condition. In this paper, to suppress the link voltage, a novel high power factor high efficiency PFC AC/DC converter is proposed using the single controller which generates two gate signals so that one of them IS used for gate signal of the flyback DC/DC converter switch and the other is applied to the Boost PFC stage. A 130W prototype for LCD monitor adapter with universal input (90-265V_rms) and 19.5V 67A output is Implemented to verify the operational principles and performances. The experimental results show that the maximum link voltage stress IS about 450 V at 270Vac input voltage. Moreover, efficiency and power factor are over 84% and 0.95, respectively, under the full load condition.