BRIDGELESS TRIPLE-RECTIFIER BOOST POWER SUPPLY CIRCUIT

摘要

Disclosed in the present invention is a bridgeless triple-rectifier Boost power supply circuit, comprising a triple-rectifier circuit, two Boost capacitors, an energy storage capacitor, a dual Boost conversion circuit, and a feedback control driving unit. The triple-rectifier circuit rectifies and charges the energy storage capacitor, and charges the two Boost capacitors separately when an input voltage is positive and negative. When the input voltage is positive and negative, the dual Boost conversion circuit relies on respective voltages on a Boost inductor and the Boost capacitors to superimpose, and alternately charges the energy storage capacitor to achieve a Boost boost conversion function. A charging circuit of the Boost capacitors in the triple-rectifier circuit only passes one diode, thereby achieving the effect of bridgeless PFC. A connection position of an input surge suppression circuit is reasonably arranged so as to have a loss of zero. Since the present invention continues to use the input structure of a traditional BoostPFC, the present invention has a better EMI effect than a traditional bridgeless PFC circuit.