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POWER SUPPLY DC VOLTAGE OFFSET DETECTOR

  • US 20080272757A1
  • Filed: 12/31/2007
  • Published: 11/06/2008
  • Est. Priority Date: 05/02/2007
  • Status: Active Grant
First Claim
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1. An apparatus comprising a power supply output voltage direct current (DC) offset detector, wherein an output voltage of a power supply comprises a ripple component and a DC offset, wherein the power supply output voltage DC offset detector comprises:

  • a comparator to generate a comparison signal during a period of the ripple component, wherein the comparison signal represents a comparison between the ripple component and a reference voltage; and

    a processor, coupled to the comparator, configured to;

    determine, based on the comparison signal, at least one of;

    (i) a first duration for which the ripple component is above the reference voltage and (ii) a second duration for which the ripple component is below the reference voltage; and

    use the first and second ripple component durations to determine the DC offset of the output voltage during the period of the ripple component.

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