Patent ID: 9397553
Filing Date: 2016-07-19
CPC Classification: H02M

Claim Text:
1. A switching mode power supply (SMPS) usable with an image forming apparatus to receive an alternating current (AC) power from an external electric power supply source and to output a direct current (DC) power, the SMPS comprising: a transformer to transform an electric power input to a primary coil and to output the transformed electric power to a secondary coil; a switching device comprising a main switch connected to the primary coil to adjust the output electric power of the transformer and a switch controller connected to the main switch to control a switching operation of the main switch; and a blocking device to block an electric power input to the switching controller when a supply state of an electric power to the image forming apparatus is a turned-off state, wherein, when the supply state of the electric power to the image forming apparatus is the turned-off state, the blocking device discharges a potential remaining on a passage from the secondary coil to the switching controller so that an output voltage of the SMPS is lowered below a reset voltage of the image forming apparatus to allow a rebooting of the image forming apparatus.