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CURRENT SWITCH WITH AUTOMATIC CALIBRATION

  • US 20130088213A1
  • Filed: 07/31/2012
  • Published: 04/11/2013
  • Est. Priority Date: 10/05/2011
  • Status: Active Grant
First Claim
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1. A method of monitoring a drive signal having a variable frequency and a variable current, said method comprising the steps of:

  • (a) dividing a spectrum of said variable drive signal frequencies into a plurality of frequency ranges each bounded by a lower frequency and an upper frequency;

    (b) substantially contemporaneously sampling a current and a frequency of said drive signal;

    (c) determining a first frequency range that includes said drive signal sample frequency; and

    (d) activating an alarm if said drive signal sample current exceeds by a predetermined magnitude a current of a temporally prior sample of said drive signal having a frequency within said first frequency range.

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