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Passive inductive switch

  • US 20040196605A1
  • Filed: 11/17/2003
  • Published: 10/07/2004
  • Est. Priority Date: 02/04/2003
  • Status: Active Grant
First Claim
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1. A system for remotely activating a deployed device, the deployed device having a load and a battery, the system comprising:

  • (a) a transmitter, remote from the deployed device, for generating an AC magnetic field; and

    (b) a receiver disposed at the deployed device, the receiver including (i) an antenna and a voltage detector coupled to said antenna for sensing the AC magnetic field and generating an output signal in response to the sensed AC magnetic field, and (ii) a switch coupled in series with the load and the battery, said switch being responsive to said output signal to couple the battery to the load, thereby activating the deployed device.

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