SWITCHING MODE POWER SUPPLY CAPABLE OF ADJUSTING STANDBY MODE MAINTAINING TIME USING A TIMER CAPACITOR AND A TIMER RESISTOR

摘要

PURPOSE: A switching mode power supply is provided to control supply of AC power to a pulse width modulation controller and control the strength of an input voltage to be supplied to a feedback controller, thereby saving power consumption during a standby mode. ;CONSTITUTION: A rectifying unit(110) converts AC power inputted from the outside into DC power. A main transformer(120) changes the voltage of the DC power rectified by the rectifying unit and outputs the changed DC power. A pulse width modulation controller(130) controls an output voltage by applying a pulse signal to a primary wire. A feedback controller(140) controls the output signal of the pulse width modulation controller by sensing the output voltage of the main transformer. A first switching device switches supply of the AC power from the pulse width modulation controller.;COPYRIGHT KIPO 2011