Patent ID: 9184669
Filing Date: 2015-11-10
Classification: H02H,H02J,H02M,H02P

Abstract:
1. A power supply apparatus comprising: a main power supply circuit that drives a load; a first switch that is turned off when an overcurrent flows through said main power supply circuit or said load is an overload for said main power supply circuit; a main rectifier circuit that receives an AC voltage through said first switch to supply said main power supply circuit with a main DC voltage; an auxiliary power supply circuit that supplies a control circuit that controls said first switch with operating power; an auxiliary rectifier circuit that receives said AC voltage while bypassing said first switch to supply said auxiliary power supply circuit with an auxiliary DC voltage; and a DC voltage detection circuit that detects said main DC voltage and said auxiliary DC voltage, wherein said main power supply circuit includes an inverter that supplies an AC output voltage from said main DC voltage to said load, said main rectifier circuit includes a first capacitor that absorbs a switching ripple of said inverter, said auxiliary rectifier circuit includes a second capacitor that smoothes said auxiliary DC voltage, said power supply apparatus further comprises a diode having an anode connected to a high-potential side end of said first capacitor and a cathode connected to a high-potential side end of said second capacitor, and said DC voltage detection circuit detects a potential of said cathode of said diode.