Sensor apparatus management methods and apparatus

  • US 20060181242A1
  • Filed: 03/01/2006
  • Published: 08/17/2006
  • Est. Priority Date: 04/19/2001
  • Status: Active Grant
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First Claim
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1. A method of simultaneously communicating with and powering a sensor apparatus that includes a silicon wafer, a rechargeable battery supported by the wafer, and a secondary coil supported by the wafer, the method uses the sensor apparatus and a power charger, the power charger having a primary coil for inducing current in the secondary coil, the method comprising the steps of:

  • a) charging the battery with currents produced by the rectification of alternating currents induced in the secondary coil from the primary coil;

    b) establishing communication between the power charger and the sensor apparatus by switching the induced current on and off; and

    c) establishing communication between the sensor apparatus and the power charger by modulating the impedance of the secondary coil while the primary coil is active.

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