Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1975-03-07
1976-10-05
Rolinec, R. V.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 60CD, 320 48, 320 51, G01N 2742
Patent
active
039847624
ABSTRACT:
Several embodiments for determining the state of charge of a cell or battery are disclosed. In accordance with one method of this invention, an A.C. voltage is applied to a cell or battery through a shunt. The phase angle between the A.C. voltage across the battery terminals and the A.C. current through the battery (measured as a shunt voltage) is continuously monitored. This phase angle is converted to an analog voltage which represents the A.C. component that is phase shifted by the impedance of the battery. The impedance and thus the phase angle changes with the state of charge of the battery. The analog voltage can be coupled to a meter that provides a phase angle reading or a state of charge reading. Further, the analog voltage can be used to control charge and discharge circuitry. In accordance with a second method, the state of charge of a battery is determined by taking phase angle readings based on input and output A.C. voltages.
REFERENCES:
patent: 2177569 (1939-10-01), Jorgensen
Willihnganz, "Battery Impedance" Electrical Engineering, vol. 78, No. 9, t. 1959, pp. 922-925.
Edelberg Nathan
Rolinec R. V.
The United States of America as represented by the Secretary of
Tokar Michael J.
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