Battery saver
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United States of America Patent
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Sep 25, 2012
Grant Date -
Oct 6, 2011
app pub date -
Mar 30, 2010
filing date -
Mar 30, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
The battery saver includes a charge pump connected to a control switch to provide a time-hysteretic threshold feature wherein it takes a longer, elapsed time threshold to activate the control switch than it does to deactivate the control switch. Control switch output is connected to a main switch wherein activation of the control switch opens the main switch to de-energize a battery-powered device's battery circuit. Control switch deactivation closes the main switch, which energizes the battery circuit of the battery-powered device. A quick elapsed time threshold allows a vibration sensor, which indicates continuing use of the battery-powered device, to instantaneously deactivate the control switch when vibrations are sensed. When the vibration sensor no longer senses motion in the device, a longer elapsed time threshold is triggered in which the charge pump slowly ramps up current to activate the control switch to turn the battery-operated device off.
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