임계모드에서 동작하는 단일 전력단을 갖는 고역률 형광등용 전자식 안정기에 관한 연구

Study of Single-Stage High-Power-Factor Electronic Ballast for fluorescent lamps operating in critical conduction mode

A single-stage high-power-factor electron ic ballast operating in critical conduction mode is presented in this paper. The proposed topology is based on integration of a boost-like converter and a LCC Type half-bridge serial resonant inverter. The power-factor-correction(PFC) stage is a boost-like converter operating in critical conduction mode for positive and negative half cycle voltage respectively at line frequency (60Hz) so that a high power factor is achieved naturally. The simulated and experimental results for 100w fluorescent lamps operating at 42kHz switching frequency and 220V line voltage have been obtained.