Patent ID: 7116563
Filing Date: 2006-10-03
Classification: H02M,Y02B

Abstract:
1. A switched mode power converter, comprising: a transformer having a primary winding and a 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 secondary winding to provide an output voltage and output current; a forward synchronous rectification device operatively coupled in series between said secondary winding and said output filter; a free-wheeling synchronous rectification device operatively coupled in shunt with said secondary winding and said output filter; and a control circuit adapted to receive a current sense signal reflecting the output current and a feedback signal reflecting the output voltage, the control circuit including a first over-current protection circuit adapted to shut off operation of the switched mode power converter if a sum of the current sense signal and the feedback signal exceed a first predetermined limit, and a second over-current protection circuit adapted to regulate operation of said primary side power switch responsive a comparison of the sum of the current sense signal and the feedback signal to a second predetermined limit, wherein said second predetermined limit is less than the first predetermined limit.