Patent ID: 7787264
Filing Date: 2010-08-31
Classification: H02M,Y02B

Abstract:
1. A synchronous rectifying circuit for power converter, comprising: a pulse generator, for generating a pulse signal in response to a rising edge and a falling edge of a switching signal; an isolation device, coupled to the pulse generator for transferring the pulse signal from a primary side of a transformer to a secondary side of the transformer; and a synchronous rectifier, having a power switch, a diode and a control circuit, wherein the power switch is coupled to the secondary side of the transformer for the rectifying operation, and wherein the control circuit is operated to receive the pulse signal for turning on/off the power switch, wherein the switching signal is used for switching the transformer of the power converter; the diode is coupled to the power switch in parallel, the pulse signal is generated to turn off the power switch in response to a magnetization of transformer; and the pulse signal is generated to turn on the power switch in response to a demagnetization of the transformer.