Battery state of charge indicator operating on bidirectional int

Details Battery state of charge indicator operating on bidirectional int Battery state of charge indicator operating on bidirectional int

1981-01-07

1983-06-14

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

320 48, 324428, G08B 2100

Patent

active

043886183

ABSTRACT:
Battery terminal voltage is measured on a continuing basis during both positive and negative voltage excursions with relation to a summed reference value to obtain a measured difference. The resultant measured difference causes the generation of convergence function signals which vary dependent upon the magnitude and polarity of the measured difference and a bi-directional integrator is connected to receive the convergence function signals to integrate in either direction dependent upon the polarity of the convergence function signals. A feedback is provided from the integrator to modify the summed reference value and the output of the integrator is indicated as a measure of the state-of-charge.

REFERENCES:
patent: 3447060 (1969-05-01), Tedd
patent: 3475061 (1969-10-01), Steinkamp et al.
patent: 4019120 (1977-04-01), Fattic
patent: 4024523 (1977-05-01), Arnold et al.
patent: 4025916 (1977-05-01), Arnold et al.
patent: 4052717 (1977-10-01), Arnold et al.
patent: 4193026 (1980-03-01), Finger et al.
Paper No. 783201 (E)-Title: Unidirectional and Bidirectional Battery State-of-Charge Indicators and Charge Controllers-Date: 10001978, Author: E. P. Finger-Presented at: The Fifth International Electric Vehicle Symposium-Sponsored by: Electric Vehicle Council.

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