Patent ID: 6532160
Filing Date: 2003-03-11
Classification: H02M,Y02B

Abstract:
A switching power supply comprising:a transformer including an input winding and an output winding; a switching circuit connected to said input winding of said transformer, and switching a DC input voltage supplied to said input winding; an output rectifier circuit including at least one output rectifier diode, said output rectifier diode having one electrode which is connected to one end of said output winding; an output smoothing circuit having an input side connected to the other electrode of said output rectifier diode; a snubber circuit including a snubber inductor, a snubber capacitor and a snubber diode, said snubber capacitor and said snubber diode being connected in series with each other, wherein said snubber capacitor and said snubber diode connected in series with each other are connected in parallel with said output rectifier diode and to a position between said output winding and the other electrode of said output rectifier diode, said snubber inductor having one end non-switchably coupled to said snubber capacitor and said snubber diode, and the other end coupled to said input side of said output smoothing circuit.