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RELATING TO DIAGNOSTICS OF A CAPACITIVE SENSOR

  • US 20100043531A1
  • Filed: 04/06/2007
  • Published: 02/25/2010
  • Est. Priority Date: 04/06/2007
  • Status: Active Grant
First Claim
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1. A detector circuit for detecting the presence of a remote capacitive sensor having at least two terminals connected via a protection circuit that includes one or more capacitors, the detector circuit comprising:

  • a voltage supply for changing the charge on the sensor and the protection circuit;

    a detector for measuring the voltage on one or more of the terminals;

    wherein the presence of the sensor is determined by causing the terminals to ground and then by causing a change of charge on one terminal in a predetermined manner such that the detector can detect the presence of the sensor by measuring a voltage variation of one or more terminals where the voltage variation is larger when the sensor is present than when the sensor is absent.

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