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QUASI-RESONANT SYSTEMS AND METHODS WITH MULTI-MODE CONTROL

  • US 20100219802A1
  • Filed: 03/23/2009
  • Published: 09/02/2010
  • Est. Priority Date: 03/02/2009
  • Status: Active Grant
First Claim
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1. A switch-mode power conversion system, the system comprising:

  • a primary winding configured to receive an input voltage;

    a secondary winding coupled to the primary winding and configured to, with one or more other components, generate an output signal;

    a feedback component configured to receive the output signal and generate a feedback signal based on at least information associated with the output signal;

    a voltage detector configured to receive the input voltage and output a detection signal;

    a mode controller configured to receive the detection signal and the feedback signal and generate a switch signal based on at least information associated with the detection signal and the feedback signal;

    a switch configured to receive the switch signal and affect a first current flowing through the primary winding;

    wherein the mode controller is further configured to;

    process information associated with the detection signal and a first threshold;

    determine whether the detection signal and the first threshold satisfy a first predetermined criterion;

    process information associated with the feedback signal and a second threshold;

    determine whether the feedback signal and the second threshold satisfy a second predetermined criterion;

    determine whether an operation mode for the switch-mode power conversion system is a quasi-resonant mode based on at least whether the first predetermined criterion is determined to be satisfied and whether the second predetermined criterion is determined to be satisfied;

    wherein the switch signal corresponds to the operation mode for the switch-mode power conversion system.

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