Patent ID: 6356462
Filing Date: 2002-03-12
Classification: H02M,Y02B

Abstract:
A soft-switched, constant-frequency, full-bridge power converter with phase-shift modulation comprising:an input power source; a first and second bridge leg each comprising a pair of serially-connected controllable switching devices adapted to connect across said input power source, each of said controllable switching devices comprising a switch, an antiparallel diode coupled across said switch and a capacitor coupled across said switch; a first and second magnetic device each having a plurality of windings formed around a corresponding magnetic core; said first and second magnetic device coupled to said first and second bridge leg in an arrangement so that when corresponding switches in said first and second bridge leg are open and closed in phase the volt-second product of said windings of said first magnetic device is maximal and the volt-second product of said windings of said second magnetic device is minimal, and when corresponding switches in said first and second bridge leg are open and closed in antiphase the volt-second product of said windings of said first magnetic device is minimal and the volt-second product of said windings of said second magnetic device is maximal; a plurality of capacitors coupled to said windings of said first and second magnetic devices to prevent their saturation by providing a volt-second balance of said windings; an output circuit for coupling a load.