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Zero Current Detecting Circuit and Related Synchronous Switching Power Converter

  • US 20120235653A1
  • Filed: 08/08/2011
  • Published: 09/20/2012
  • Est. Priority Date: 03/17/2011
  • Status: Active Grant
First Claim
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1. A zero current detecting circuit, comprising:

  • a first zero current comparator for determining current variation on an inductor of a synchronous switching power converter so as to accordingly turn off a down-bridge transistor of the synchronous switching power converter;

    a second zero current comparator for determining whether the first zero current comparator turns off the down-bridge transistor too early or too late, and outputting a comparison result;

    a counter coupled to the second zero current comparator for ascending or descending a control bit according to the comparison result; and

    an adjustable voltage source coupled to the first zero current comparator and the counter for adjusting a offset voltage according to the control bit.

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