Patent ID: 8416587
Filing Date: 2013-04-09
Classification: H02M,Y02B

Abstract:
1. A synchronous rectifier control circuit, comprising: a) a first sense circuit configured to sense a first voltage across first and second power terminals of a synchronous rectifier device prior to a turn-on of said synchronous rectifier device, and to generate a first control signal from said first sensed voltage and a complementary output of a flip-flop circuit, wherein a timing of said turn-on of said synchronous rectifier device is adjustable using said first control signal, and wherein said synchronous rectifier device comprises one or more transistors coupled in parallel to said first and second power terminals; b) a second sense circuit configured to sense a second voltage across said first and second power terminals of said synchronous rectifier device prior to a turn-off of said synchronous rectifier device, and to generate therefrom a second control signal, wherein a timing of said turn-off of said synchronous rectifier device is adjustable using said second control signal; and c) a driver control circuit configured to receive said first and second control signals, and to generate therefrom a gate control signal configured to drive a control terminal of said synchronous rectifier device to control said turn-on and said turn-off of said synchronous rectifier device, wherein said driver control circuit comprises said flip-flop circuit that is set by said first control signal to control said turn-on of said synchronous rectifier device, and reset by said second control signal to control said turn-off of said synchronous rectifier device.