High precision relative digital voltage measurement

Details High precision relative digital voltage measurement High precision relative digital voltage measurement

1996-06-20

1998-08-25

Trammell, James P.

Boots, shoes, and leggings

324609, G05F 108

Patent

active

057989338

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.

REFERENCES:
patent: 4504922 (1985-03-01), Johnson et al.
patent: 5008865 (1991-04-01), Shaffer et al.
patent: 5420798 (1995-05-01), Lin et al.
patent: 5442794 (1995-08-01), Wisor et al.

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