SWITCHING MODE POWER SUPPLY HAVING AN INITIAL BIAS POWER SUPPLY UNIT CONSISTING OF ONE HIGH VOLTAGE TRANSISTOR AND ONE LOW VOLTAGE TRANSISTOR

摘要

PURPOSE: A switching mode power supply having an initial bias power supply unit is provided to reduce the standby power consumed by a battery by completely blocking current consumption caused by an initial bias power supply unit after completing the initial bias power supplying.;CONSTITUTION: A power supply unit(100) supplies the DC voltage to a primary coil of a transformer. A power output unit(200) outputs the DC voltage from a secondary coil of the transformer. A feedback voltage supplying unit(300) offers the feedback voltage. A switching controller(400) controls the switching frequency of a main switch.;COPYRIGHT KIPO 2011