MULTI OUTPUT SWITCHING POWER CIRCUIT FOR REDUCING POWER CONSUMPTION IN A STANDBY MODE

摘要

A multi output switching power circuit for reducing power consumption in a standby mode is provided to minimize influence on an input terminal and an output terminal according to on and off operations of a standby power consumption reducing element by turning on and off the element for reducing standby power consumption. A multi output switching power circuit for reducing power consumption in a standby mode includes an input power transformer(310), an output power transformer(320), two or ore output circuit units(370,380), a standby power reducing element(330), a sub output unit(360), a feed-back unit(350), and a switching control unit(340). The input power transformer induces a voltage by using interaction of primary and secondary coils for an inputted rectification current. The standby power reducing element is connected between the secondary coil of the input power transformer and a primary coil of the output power transformer to be on and off according to a control signal applied from an outside. The sub output unit is coupled to a secondary terminal of the input power transformer. The feed-back unit feeds back an output voltage of the sub output unit. The switching control unit is controlled by the output signal of the feed-back unit to switch a current flowing on the primary coil of the input power transformer.