High precision relative digital voltage measurement
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United States of America Patent
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Aug 25, 1998
Grant Date -
N/A
app pub date -
Jun 20, 1996
filing date -
Jun 21, 1995
priority date (Note) -
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Importance
Abstract
This device determines a quantity corresponding to a linear function of a voltage to be detected, and includes a circuit for charging with a determined time constant a capacitor, and a microcontroller. The microcontroller compares the voltage across the capacitor to a predetermined threshold and then resets the voltage across the capacitor. A counter counts the time duration between the end of a capacitor reset and the time when it reaches the predetermined threshold and calculates the inverse of said duration. This data can then be used to signal the end of a process, such as the proper charging of rechargeable batteries.
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