Switched mode power converter having synchronous rectification and secondary side post regulation

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;
• a plurality of secondary side circuits providing respective output voltages and output currents, each secondary side circuit comprising:
• an output filter operatively coupled to said at least one secondary winding to provide a respective 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 respective output voltage and said respective output current.

In a 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, and an output filter operatively coupled to said at least one secondary winding to provide an output voltage and output current, a method for regulating performance comprises the steps of:

• activating first and second switches coupling current from said at least one secondary winding to said output filter synchronously with a first voltage state of said primary and secondary windings;
• activating a third switch maintaining flow of current through said output filter while bypassing said secondary winding synchronously with a second voltage state of said primary and secondary windings;
• and
• modulating activation time of said first and second switches to regulate at least one of said output voltage and said output current.