Passive Pfc for Flyback Convertors
نویسندگان
چکیده
A new passive Power Factor Corrector (PFC) based on Valley Fill (VF) is proposed for an off-line Flyback converter. By adding an extra winding which is magnetically coupled to the Flyback transformer and electrically coupled to the VF, higher Power Factor (PF) and lower Total Harmonic Distortion (THD) can be achieved. The proposed circuit uses a high frequency inductor, low voltage capacitors that operate at a voltage slightly higher then the half of the peak line voltage, and a low stress switch for DC/DC conversion. Since it is passive an active switch for PFC functions is not necessary. The paper describes the proposed circuit in detail followed by experimental results.
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