Electronic lock with power failure control circuit
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United States of America Patent
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Feb 20, 2018
Issued Date -
N/A
app pub date -
Feb 25, 2015
filing date -
Dec 30, 2010
priority date (Note) -
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Abstract
An electronic lock with power failure control circuit includes a lock mechanism having a latchbolt movable between extended and retracted positions and an electrically powered lock actuator to lock and unlock the latchbolt. The power failure control circuit includes a microcontroller and the lock is connected to a primary power source and an auxiliary power source, preferably supercapacitors and charger that can be turned on by the microcontroller and off when the charger signals a full charge. A power monitor circuit detects low voltage on the primary power supply and sets a power failure interrupt causing the microcontroller to execute power failure instructions that control the actuator so that the lock is placed into a desired locked or unlocked final state during the power failure. Upon detection of the return of good power, the system resets the lock.
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