Patent ID: 7903440

Claim:
A synchronous regulation circuit for a power converter, comprising: a primary-side switching circuit generating a switching signal and a synchronous signal, the switching signal coupled to switch a transformer; a secondary-side switching circuit coupled to the output of the power converter to generate a pulse signal in response to the synchronous signal and a feedback signal; an isolation device coupled to the primary-side switching circuit for transferring the synchronous signal in the primary side of the transformer to the secondary-side switching circuit in the secondary side of the transformer; and a synchronous switch having a power switch and a control circuit, the power switch coupled in between the secondary side of the transformer and the output of the power converter, the control circuit receiving the pulse signal for turning on/off the power switch; wherein the feedback signal is correlated to the output of the power converter, the pulse signal is a differential signal generated for rectifying and regulating of the power converter, the polarity of the pulse signal determines the on/off of the power switch.