Patent ID: 6011703
Filing Date: 2000-01-04
Classification: H02M,Y02B

Abstract:
For use with a synchronous rectifier of a power converter, a self-synchronizing drive circuit, comprising:a drive winding, associated with an isolation transformer of said power converter and coupled to a rectifying switch of said synchronous rectifier, that provides a drive signal based on a voltage of said isolation transformer to a control terminal of said rectifying switch to charge said control terminal of said rectifying switch synchronously with said voltage;a drive switch, interposed between a terminal of said drive winding and said control terminal of said rectifying switch, that periodically resists creation of a negative potential on said control terminal of said rectifying switch; anda discharge device, having a control terminal coupled to said terminal of said drive winding, that receives said drive signal and discharges said control terminal of said rectifying switch synchronously with said voltage.