Bridgeless Boost PFC Converter with Power Decoupling
Conventional rectifier converters usually require large-capacity electrolytic capacitors to buffer the second-order ripple power,which has the problems of high full-bridge rectification power loss and unreliable electrolytic capacitor operating state.The active power decoupling(APD)technique is used to reduce the inherent second order output ripple power of the power factor correction(PFC)con-verter,and the bridgeless boost topology is used to reduce the full-bridge losses.The circuit reliability is improved by buffering the diode ripple power with a decoupling circuit and significantly reducing the capacitance of the capacitors in the converter,and then using high voltage resistant and long life film capacitors.In this circuit topology,the DC bus voltage load is low,the AC input current is kept at the unit power factor(UPF),and the total harmonic distortion(TDH)and output current-voltage ripple of the input current meet the applica-tion criteria.Finally a 50 W prototype is built to verify the correctness of the circuit topology and control strategy.
bridgeless converteractive power decouplingpower factor correctionsecond-order ripple power
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维普
