Title: Battery state of charge gauge

Abstract: A circuit for detecting and indicating the actual state of charge of a storage battery in response to signals sampled from various points in the circuit powered by the battery. Such circuit is adapted to calculate the open circuit voltage of the battery, it being realized that the open circuit voltage is directly proportional to the battery state of charge. A function generator is constructed to simulate the characteristic curve of the battery relating the internal resistance to the percent charge. Feedback is provided from the output of the indicating circuitry to the bias point of the function generator for causing the generator to produce a signal related to the actual internal resistance of the battery. The circuit is adapted to provide a reliable indication of the amount of usable energy remaining in the battery, irrespective of the conditions under which the battery was discharged.

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Inventors: Christianson, Clinton C. (Minnetonka, MN, US)
Bourke, Robert F. (Wilson, WI, US)

Application Number: 548913
Filing Date: 1975-02-11
Publication_date: 1976-03-23
Assignee: Gould, Inc. (Rolling Meadows, IL)
Primary Class(es): 324/430 320/163
Other Classes:
US Patent Ref:

3676770	Jul, 1972	Sharaf et al.	320/48.
3778702	Dec, 1973	Finger	324/29.
3886428	May, 1975	Macharg	320/21.
3886442	May, 1975	Chiku et al.	320/48.

Other Refs:
Primary Examiner: Miller, J. D.
Assistant Examiner: Hickey, Robert J.
Attorney: Wolfe, Hubbard, Leydig, Voit & Osann, Ltd.