Patent ID: 6452816
Filing Date: 2002-09-17
Classification: H02M,Y02B

Abstract:
A switching power supply comprising:A) a DC-DC converter comprising: a) a full bridge inverter including first and second series pairs of switching sections, each switching section having 1) a switching device turned ON and OFF by switching signals, and 2) a diode and a capacitor each connected to said switching device in parallel; b) a transformer comprising a primary winding and at least one secondary winding, said primary winding connected between the junction point of said first series pair of switching sections and the junction point of said second series pair of switching sections; c) a rectifying circuit for performing full-wave rectification on the output of said transformer; and d) a smoothing circuit for smoothing the output of said rectifying circuit; B) a switching control section for outputting said switching signals to said switching devices at a predetermined switching frequency; C) a load current sensing section for sensing the amount of load current output from said DC-DC converter; and D) a delay section for delaying said switching signals for a predetermined delay time depending on said amount of load current sensed by said load current sensing section.