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SYSTEMS AND METHODS FOR VOLTAGE CONTROL AND CURRENT CONTROL OF POWER CONVERSION SYSTEMS WITH MULTIPLE OPERATION MODES

  • US 20140078790A1
  • Filed: 10/05/2012
  • Published: 03/20/2014
  • Est. Priority Date: 09/14/2012
  • Status: Active Grant
First Claim
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1. A system controller for regulating a power conversion system, the system controller comprising:

  • an operation-mode-selection component configured to receive a first signal related to an output load of the power conversion system and a second signal related to an input signal received by the power conversion system and output a mode-selection signal based on at least information associated with the first signal and the second signal; and

    a driving component configured to receive the mode-selection signal and generate a drive signal based on at least information associated with the mode-selection signal, the driving signal corresponding to a switching frequency;

    wherein the operation-mode-selection component is further configured to;

    if the output load is determined to be larger than a first load threshold in magnitude and the input signal is determined to be larger than an input threshold, generate the mode-selection signal corresponding to a quasi-resonant mode if the switching frequency is determined to be smaller than a first frequency threshold and larger than a second frequency threshold; and

    if the output load is determined to be larger than the first load threshold in magnitude and the input signal is determined to be smaller than the input threshold, generate the mode-selection signal corresponding to a continuous conduction mode if the switching frequency is determined to be equal to the second frequency threshold.

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