Patent ID: 6788554
Filing Date: 2004-09-07
Classification: H02M,Y02B

Abstract:
A switched mode power converter, comprising:a transformer having a primary winding and at least one secondary winding; a primary side power switch coupled to said primary winding and being adapted to periodically apply an input voltage to said primary winding; an output filter operatively coupled to said at least one secondary winding to provide an output voltage and output current; first and second active switch devices operatively coupled in series between said at least one secondary winding and said output filter, and a third active switch device operatively coupled in shunt with said at least one secondary winding and said output filter, said first and second active switches being arranged such that in an inactivated state each one blocks current between said at least one secondary winding and said output filter in an opposite direction; and a control circuit coupled to said first, second and third active switches, said control circuit activating said first and second active switches synchronously with a first voltage state of said primary and secondary windings and activating said third active switch synchronously with a second voltage state of said primary and secondary windings, wherein said control circuit modulates an activation time of said first and second active switches to regulate at least one of said output voltage and said output current.