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Weak power supply operation and control

  • US 9,720,477 B2
  • Filed: 11/21/2012
  • Issued: 08/01/2017
  • Est. Priority Date: 11/21/2012
  • Status: Active Grant
First Claim
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1. Apparatus comprising:

  • a power supply; and

    power monitoring circuitry, configured to monitor the power supply, and comprising;

    a clock configured to generate a clock signal using power supplied by the power supply;

    a capacitor configured to receive a current, so as to charge the capacitor;

    a switching device, connected to the capacitor, configured to discharge the capacitor at fixed time intervals in response to receipt of the clock signal; and

    a comparator, configured (a) to perform the monitoring of the power supply by performing a comparison of a voltage developed by the capacitor with a threshold voltage, and (b) to output an indication of a reduction in power supplied by the power supply when the switching device ceases to discharge the capacitor at the fixed time intervals due to the reduction in power.

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