To provide a device that rectifies a voltage that is generated on an auxiliary winding 620 added to an inductance 62 included in a load 60, that is capable of improving power factor by connecting the rectified voltage in series to a rectifying power supply 10, and that makes it unnecessary to add a complex and expensive active filter or the like.

The rectifying power supply 10 is provided that rectifies the voltage of an AC power source 11. An auxiliary power circuit 20 is provided in series to the rectifying power supply 10. An inverter circuit is provided. This inverter circuit includes a pair of switching elements 41/42 in series in the forward direction, flywheel diodes 51/52 each connected in parallel reversely to the switching elements 41/42 respectively, and a load 60 whose one end is connected to the point of intersection of the switching elements 41/42. The load 60 includes the inductance 62. This inductance 62 includes the auxiliary winding 620 that magnetically interlinks with its main winding. The auxiliary power circuit 20 impresses the voltage of the auxiliary winding 620 in forward series to the rectifying power supply 10 to expand the conduction angle of the rectifying power supply 10.