DIRECT CURRENT POWER SUPPLY DEVICE

摘要

A direct current power supply device for converting alternating current power to direct current power and outputting the direct current power comprises: shunt resistance (1005) connecting the minus output terminal of a diode bridge (1003) for rectifying the alternating current voltage to a semiconductor switch; and a current detecting unit (1011) for detecting the current flowing to the shunt resistance (1005). A plus offset value is provided to the current detecting unit (1011) to raise the detected current value above the current flowing to the shunt resistance (1005), thereby reducing power harmonics and improving the power factor.