Passive inductive switch
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United States of America Patent
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Feb 27, 2007
Issued Date -
N/A
app pub date -
Nov 17, 2003
filing date -
Feb 4, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A passive inductive switch for coupling a battery to a load in a remotely deployed battery-powered electronic device. The switch operates in response to a transmitted magnetic field at a particular frequency. The switch includes an antenna for transforming the magnetic field into an induced voltage and a voltage detector for sensing the induced voltage and triggering a switching element. The switch operates in a standby mode until a sufficient voltage is induced in the antenna which causes the switch to couple the battery to the load. In the standby mode the switch draws a negligible amount of power, which permits the device to be deployed in the field for long periods of time without expending significant battery power.
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