Wake-up circuit for a security device
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United States of America Patent
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Feb 20, 2018
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N/A
app pub date -
Dec 9, 2010
filing date -
Dec 9, 2010
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Abstract
An exemplary security device includes a reader configured to read information stored on a credential device. The reader enters a sleep mode when not reading a credential device. A wake-up module includes an inductively coupled resonant circuit. The wake-up module is configured to detect a credential device near the reader if the credential device has a resonant frequency corresponding to a frequency of an electromagnetic field of the inductively coupled resonant circuit that is controlled by a stable oscillator. The wake-up module is configured to provide an indication to wake-up the reader from the sleep mode responsive to detecting a change in power of the electromagnetic field caused by the credential device.
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