Patent ID: 6108218
Filing Date: 2000-08-22
Classification: H02M,Y02B,Y02P

Abstract:
A switching power supply comprising:first and second input terminals for connection to an external AC power source;a rectifier circuit, said rectifier circuit having an input and an output, the input being connected across said first and second input terminals;a DC voltage source;a transformer including a primary winding, a secondary winding and a tertiary winding, said tertiary winding being interposed between the output of said rectifier and said DC voltage source;a semiconductor switch;said transformer and said semiconductor switch outputting an isolated DC voltage from said DC voltage source;first and second diodes, said first and second diodes being operatively coupled to said first and second input terminals respectively, said first and second diodes being connected together to form an output of said diodes;a series circuit including a plurality of diodes, said series circuit being connected in parallel with said DC voltage source;a capacitor, said capacitor being connected between the output of said first and second diodes and a connection point of said plurality of diodes connected in series; andan inductor, said inductor being interposed between the output of said first and second diodes and said semiconductor switch.