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MULTIPLE CHANNEL CAPACITIVE VOLTAGE DIVIDER SCANNING METHOD AND APPARATUS

  • US 20150097583A1
  • Filed: 10/01/2014
  • Published: 04/09/2015
  • Est. Priority Date: 10/04/2013
  • Status: Active Grant
First Claim
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1. A method for determining change in capacitance of at least one capacitive sensor of a plurality of capacitive sensors, said method comprising the steps of:

  • charging a plurality of capacitive sensors to a first voltage;

    charging a sample and hold capacitor to a second voltage;

    individually coupling each one of the plurality of capacitive sensors to the sample and hold capacitor, wherein electron charge from each of the individually coupled ones of the plurality of capacitive sensors is transferred to the sample and hold capacitor;

    measuring a resulting voltage on the sample and hold capacitor after all of the plurality of capacitive sensors have been individually coupled to the sample and hold capacitor; and

    comparing the measured resulting voltage to a previously measured resulting voltage, wherein if the measured resulting voltage is different than the previously measured resulting voltage then at least one capacitive sensor of the plurality of capacitive sensors has changed capacitance value.

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