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AUDIBLE NOISE SUPPRESSION IN A RESONANT SWITCHING POWER CONVERTER

  • US 20100020573A1
  • Filed: 09/30/2008
  • Published: 01/28/2010
  • Est. Priority Date: 07/25/2008
  • Status: Active Grant
First Claim
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1. A resonant switching power circuit, comprising:

  • a resonant circuit including at least one inductance and at least one capacitance for transferring energy to an output of the resonant switching power circuit;

    a switching circuit coupled to the resonant circuit for transferring energy from an input voltage source to the resonant circuit; and

    a control circuit having a burst mode for controlling the switching circuit during low energy demand conditions, in which a number of pulses are generated in intermittent bursts, and wherein the bursts are varied in a manner that reduces the amplitude of peaks in an average audio spectrum of the bursts over that of a burst having a substantially fixed pulse pattern and burst repetition rate.

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