Patent ID: 6392902
Filing Date: 2002-05-21
Classification: H02M,Y02B

Abstract:
An improved, constant-frequency, phase-shift-controlled full-bridge dc-to-dc converter, comprising:first and second pairs of serially-connected controllable switching devices, each pair adapted to connect across a power source, each of said controllable switching device comprising a switch, an antiparallel diode coupled across said switch and a capacitor coupled across said switch; a coupled inductor having first and second windings, each winding having a first terminal and a second terminal, said second terminals of said first and second windings being connected to form a common terminal of said coupled inductor; first and second blocking capacitors, said first blocking capacitor being coupled between said first terminal of said first winding of said coupled inductor and a common terminal of said first pair of controllable switching device, and said second blocking capacitor being coupled between said first terminal of said second winding of said coupled inductor and a common terminal of said second pair of controllable switching device; a transformer having first and second windings, said first winding of transformer being coupled between said common terminal of said coupled inductor and a terminal of said power source; and an output circuit coupling said secondary winding of said transformer to a load.