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Switching power converter with switch control pulse width variability at low power demand levels

  • US 8,120,341 B2
  • Filed: 05/02/2008
  • Issued: 02/21/2012
  • Est. Priority Date: 05/02/2007
  • Status: Active Grant
First Claim
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1. A system comprising:

  • a switch mode controller to generate a switch control signal to control conductivity of a switching mode switch included in a switching power converter, wherein the switch mode controller comprises;

    a period generator to determine a nominal period of the switch control signal, recognize when the nominal period corresponds with a frequency in at least a portion of an audible frequency band, and to vary the nominal period to generate a broad frequency spectrum of the switch control signal when the nominal period corresponds with a frequency in at least a portion of an audible frequency band.

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