Method and apparatus of providing synchronous regulation for offline power converter

  • US 20090141521A1
  • Filed: 12/03/2007
  • Published: 06/04/2009
  • Est. Priority Date: 12/03/2007
  • Status: Active Grant
First Claim
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1. An offline synchronous regulation power converter, comprising:

  • a secondary-side switching circuit coupled to the output of the power converter to generate a pulse signal and a synchronous signal in response to a feedback signal;

    an isolation device coupled to the secondary-side switching circuit for transferring the synchronous signal from the secondary side of the power converter to the primary side of the power converter;

    a primary-side switching circuit generating a switching signal to switch a primary winding of a transformer in response to the synchronous signal; and

    a synchronous switch having a power switch and a control circuit, the power switch coupled from a secondary winding of the transformer to 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 generated for rectifying and regulating of the power converter, the polarity of the pulse signal determines the on/off of the power switch.

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