Capacitor power source tamper protection and reliability test
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United States of America Patent
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Oct 15, 2013
Grant Date -
Jul 4, 2013
app pub date -
Dec 29, 2011
filing date -
Dec 29, 2011
priority date (Note) -
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Abstract
A verification circuit for a capacitor power supply measures at least two voltages across the terminals of the capacitor at two points in time, the two points in time defining a time interval dT. A change in voltage dV over the time interval dT is determined. An operation powered by the capacitor is initiated, or not, by deriving from the time interval dT and/or the voltage change dV, a total required time or a total required voltage for completing the operation, and comparing the total required time or total required voltage to a pre-determined necessary total time or predetermined necessary total voltage, respectively (a “time interval test”).
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