An Auxiliary Flyback Circuit with Output Voltage Ripple Suppression for Single-Phase Isolated Full-Bridge Boost PFC Converter

摘要

An effective auxiliary flyback circuit to suppress voltage ripple is proposed and investigated in a single-phase isolated full-bridge boost power factor correction (PFC) converter, by which the output voltage ripple can be suppressed obviously. The output voltage ripple can be reduced by adding the auxiliary link using the absorbed energy from the voltage spike. The energy is controlled to be transferred to the output side through a flyback converter parallel with the clamp branch capacitor. The output voltage ripple was estimated by the second order harmonic extraction link in which notch filter is used to extract the second order harmonic from the output voltage. With the help of the added energy path, the lower output voltage ripple can be achieved. Experimental results show that this auxiliary flyback circuit has a good effect on reducing the output voltage ripple on a laboratory-made prototype.