Patent ID: 8325496

Claim:
A switching power supply device comprising: a switching circuit that converts DC input power into AC power by means of a switching operation; a transformer having a primary winding to which said AC power is supplied; a secondary winding; a first rectifier that rectifies AC power induced in said secondary winding of said transformer into direct current power, said first rectifier having an anode connected to a ground; a second rectifier having an anode connected to a cathode of said first rectifier; a capacitor that has a first end connected to a cathode of said second rectifier and a second end connected to the ground and that functions as an auxiliary power supply for a load; and an output terminal that is connected to said secondary winding via an output winding, wherein one end of the secondary winding of said transformer is connected to the cathode of said first rectifier and the anode of said second rectifier.