Patent ID: 9391443
Filing Date: 2016-07-12
CPC Classification: G03G,G06K,H02H

Claim Text:
1. A power supply apparatus comprising: a first power supply configured to convert an input AC voltage into a first voltage, and output the first voltage; a second power supply configured to convert the input AC voltage into a second voltage, and output the second voltage; a switch configured to switch between a voltage supply state in which the input AC voltage is supplied to the second power supply and a voltage cut-off state in which the input AC voltage is not supplied to the second power supply; a state-switching unit configured to switch a state of the switch between the voltage supply state and the voltage cut-off state according to a variation of the first voltage output from the first power supply; and a detection unit configured to detect the input AC voltage, wherein the first power supply is configured to cause decrease of the first voltage in a case where a value of the input AC voltage detected by the detection unit is equal to or more than a predetermined value, and wherein the state-switching unit is configured to switch a state of the switch from the voltage supply state to the voltage cut-off state according to the decrease of the first voltage.