Patent ID: 7532493
Filing Date: 2009-05-12
Classification: H02M,Y02B

Abstract:
1. A power supply comprising: a main power converter connected to an input power source, having at least one output filter capacitor for connecting a load, and further including a bulk capacitor as an intermediate energy storage component; an auxiliary power converter connected to said input power source in parallel, having a first output connected to said output filter capacitor of said main power converter, and having a second output connected to said bulk capacitor of said main power converter; and a control circuit to control said main power converter and said auxiliary power converter; wherein said auxiliary power converter includes: an input-filter capacitor; a first output-filter capacitor connected across said first output; a second output-filter capacitor connected across said second output; a transformer having a primary winding and a secondary winding, one terminal of said secondary winding connected to the negative terminal of said first output-filter capacitor; two switches periodically coupling and decoupling said primary winding and said input-filter capacitor; two rectifiers coupling said primary winding and said second output-filter capacitor; and a third rectifier coupling said secondary winding and said first output-filter capacitor.