Battery charging

Details Battery charging Battery charging

1984-03-05

1985-10-22

Hickey, R. J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 14, 320 39, H02J 710

Patent

active

045491275

ABSTRACT:
A battery charger comprises a power supply for supplying current pulses to a battery to be charged. A microprocessor receives from an analog-to-digital converter codes representing the voltage between the battery terminals with the battery off-load between charging pulses and monitors the ratio of the voltage difference (V.sub.3 -V.sub.5) during a first period following a charging pulse to the voltage difference (V.sub.10 -V.sub.12) over a second period following the charging pulse, with the second period ending after the beginning of the first period. The value of this ratio reaches a peak value and then declines, and the microprocessor determines when the value of the ratio falls below a peak value thereof by a predetermined amount to terminate fast charging of the battery, after which the battery may be removed or may remain on a trickle charge. An accurate, reliable, and consistent determination of completion of charging of sealed nickel-cadmium batteries is thus provided.

REFERENCES:
patent: 3936718 (1976-02-01), Melling et al.
patent: 3944904 (1976-03-01), Hase
patent: 4118661 (1978-10-01), Siekierski et al.
patent: 4302714 (1981-11-01), Yefsky
patent: 4342954 (1982-08-01), Griffith

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