Patent ID: 9568874
Date: 2017-02-14
CPC Classifications: B41J,G03G,G06F

Claim:
1. A power supply system comprising: a switching power supply configured to convert an alternating current voltage applied from an alternating current power supply into a direct current voltage and output the direct current voltage, the switching power supply being configured to be operated in an operation mode including an on mode in which the switching power supply oscillates and an off mode in which the oscillation of the switching power supply is stopped; a mode controller configured to generate a pulse signal for designating one of the on mode and the off mode; an auxiliary power supply configured to feed power to the mode controller when the oscillation of the switching power supply is stopped; a power supply controller configured to be activated as the power is fed to the power supply controller from the alternating current power supply and to control an oscillation operation of the switching power supply in accordance with the pulse signal generated by the mode controller; and a supply detector configured to detect starting of the power feeding from the alternating current power supply, wherein the power supply controller is configured to execute: oscillation processing of oscillating the switching power supply when the pulse signal is input from the mode controller during the oscillation stop; oscillation stop processing of stopping the oscillation of the switching power supply when the pulse signal is input from the mode controller during the oscillation; and invalidation processing of invalidating an input of the pulse signal for predetermined time when the supply detector detects the starting of the power feeding from the alternating current power supply.