Patent ID: 6407934
Filing Date: 2002-06-18
Classification: H02M,Y02B

Abstract:
A switching power converter comprising:a DC input power supply, a transformer having at least a primary winding and a secondary winding, a first switch connected in series with said primary winding to form a series circuit, the series circuit being connected in parallel with said DC input power supply, a second switch connected equivalently across both ends of said primary winding via a capacitor, a third switch connected in series with said secondary winding, a first control drive circuit for alternately turning on/off said first switch and said second switch and having predetermined on-periods, off-periods and rest periods by detecting the output of the series circuit of said third switch and said secondary winding, and a second control drive circuit for turning on said third switch after a predetermined period from the turn-on of said second switch and for turning off said third switch before a predetermined period from the turn-off of said second switch.