Charging a transponder in a security system
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United States of America Patent
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Aug 4, 1998
Grant Date -
N/A
app pub date -
Apr 21, 1997
filing date -
Apr 21, 1997
priority date (Note) -
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Abstract
A security system utilizing a key-mounted transponder achieves fast and accurate charging of the transponder by using a frequency search and acquisition phase which attempts partial charging pulses at a plurality of spaced frequencies. After a successful partial charging, a frequency calibration signal is received from the transponder which provides a reference in the transceiver for producing a pulse for fully charging the transponder. Frequency search and acquisition allows robust system operation while using low cost and low tolerance parts.
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