Patent ID: 9685870
Date: 2017-06-20
CPC Classifications: H02M,Y02B

Claim:
1. A power supply comprising: a first rectifier circuit rectifying a first phase AC input of a multi-phase AC input to generate a first rectified AC line voltage; a bulk capacitor; a first switching device connected between the first rectified AC line voltage and the bulk capacitor; and a first comparator receiving the first rectified AC line voltage and a reference voltage, comparing the first rectified AC line voltage with a plurality of hysteresis reference voltages that are based on the reference voltage, and switching the first switching device to cut a predetermined phase of the first phase AC input from charging the bulk capacitor according to a result of comparing the first rectified AC line voltage with the plurality of hysteresis reference voltages, wherein the bulk capacitor is charged by the first rectified AC line voltage when the first rectified AC line voltage is highest among rectified AC line voltages generated by rectifying the multi-phase AC input in a turn-on time of the first switching device and energy stored in the bulk capacitor is discharged in a turn-off time of all switching devices connected to the rectified AC line voltages.