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Power supply monitoring circuit, AC/DC conversion apparatus and control method of power supply monitoring circuit

  • US 9,297,838 B2
  • Filed: 07/18/2013
  • Issued: 03/29/2016
  • Est. Priority Date: 08/02/2012
  • Status: Active Grant
First Claim
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1. A power supply monitoring circuit comprising:

  • a holding part holding, every time a local maximum value of a power supply voltage which fluctuates is detected, the local maximum value as a local maximum voltage value;

    a power stop detector detecting whether or not supply of the power supply voltage is stopped based on whether or not a state that a value of the power supply voltage is smaller than a first reference value according to the local maximum voltage value continues longer than a predetermined period; and

    a reference value controller decreasing the first reference value during a period in which the value of the power supply voltage exceeds a second reference value smaller than the first reference value and in which stop of the supply of the power supply voltage is detected.

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