Process and apparatus for determining the state of charge of a b

Electricity: measuring and testing – Electrolyte properties – Using a battery testing device

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320 48, G01N 2746

Patent

active

044332955

ABSTRACT:
A process and apparatus for determining the state of discharge of an electric battery by measuring the voltage drop associated with changes in its internal resistance. According to the process, the battery is periodically connected to a reference load for a brief interval during which the voltage at the terminals of the load is measured. The measured analog voltage is converted to a digital signal which is compared to a number of pre-programmed digital levels to determine the state of change of the battery. The apparatus comprises a commutation component controlled by a logic signal, a reference load, a sampler-and-hold circuit, an analog-to-digital converter and a comparator which can be programmed at n levels. The apparatus compares digital signals corresponding to the voltage at the terminals of the reference load with the n programmed levels of the decoder and a signal is generated indicating the level of the electric battery with respect to the levels programmed into the comparator.

REFERENCES:
patent: 3899732 (1975-08-01), Staby
patent: 3970933 (1976-07-01), Hamaguchi
patent: 4080560 (1978-03-01), Abert
patent: 4352067 (1982-09-01), Ottone

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