Patent ID: 6944036
Filing Date: 2005-09-13
Classification: H02M,Y02B

Abstract:
1. A phase shifted full bridge converter having a clamp circuit, said converter comprising: a first series switch circuit comprising a first switch and a second switch, said first switch and said second switch connected with a DC input source in series; a second series switch circuit comprising a third switch and a fourth switch, said third switch and said fourth switch connected with said DC input source in series; a clamp circuit comprising a first clamp diode and a second clamp diode, said first clamp diode and said clamp diode connected to said DC input source in series; a set of inductances comprising a first inductance and a second inductance that connect in series and are coupled with each other, a terminal of said first inductance connected to a connection point at which said third switch and said fourth switch are connected in series and a terminal of said second inductance coupled to said clamp circuit; a transformer comprising a primary winding and a secondary winding, said primary winding connected between a first connection point at which said first switch and said second switch are connected in series and a second connection point at which said first inductance and said second inductance are connected in series; and an output rectifier circuit comprising a rectifier, a filtering capacitor, and a filtering inductance, said output rectifier circuit connected to said secondary winding; wherein when a current in said rectifier is changing a direction of said current, a reverse recovery current of a rectifier diode of said rectifier reflects to a primary side of said transformer and forms an induced current flowing through said first inductance and said primary winding, when said reverse recovery current of said rectifier diode is cut off, said induced current decreases and passes through said set of inductances and said clamp circuit.