Patent ID: 9329561
Filing Date: 2016-05-03
CPC Classification: G03G,H02H,H02M

Claim Text:
1. A power supply apparatus, comprising: a transformer having a primary side and a secondary side insulated with each other; a first line and a second line to which an AC voltage is input from an AC power supply; a rectifying and smoothing unit that rectifies and smoothes the AC voltage input through the first line and the second line; a shut-off unit provided between the first line and the rectifying and smoothing unit to shut off an input of the AC voltage; a switching element that switches a current from the rectifying and smoothing unit to the primary side of the transformer; a first overvoltage detection unit that when an input of an AC voltage higher than a first threshold value from the AC power supply is detected, outputs a voltage corresponding to the AC voltage; a second overvoltage detection unit that receives the voltage output from the first overvoltage detection unit, wherein when it is detected that the voltage is higher than a second threshold value, the second overvoltage detection unit outputs an overvoltage detection signal; and a control unit that controls the shut-off unit to shut off the input of the AC voltage when the overvoltage detection signal is detected.