Battery charging method and apparatus

Details Battery charging method and apparatus Battery charging method and apparatus

1992-05-05

1994-04-26

Stephan, Steven L.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

310 20, 310 37, 310 46, H02J 700, H01M 1044

Patent

active

053070011

ABSTRACT:
A battery charger employing the gassing point of a lead-acid battery to determine the end of charge time and voltage. A charging level sensor takes two voltage samples of a predetermined time period to determine the change in voltage rate. If the change in voltage rate exceeds a predetermined amount the batteries are considered to be gassing. The batteries are further charged for a predetermined amount of time after the gassing phase has been entered. The invention provides a load management control function to provide a safe DC charge voltage when a hall effect sensor senses a DC load. The charger is cut off if a house load is used while the battery is being charged. The charging circuit achieves different end of charge voltages depending on a user selected battery type. The battery charger is a constant voltage temperature compensated current limited charger.

REFERENCES:
patent: 4034279 (1977-07-01), Nilsson
patent: 4388582 (1983-06-01), Saar et al.
patent: 4639655 (1987-01-01), Westhaver et al.
patent: 4746852 (1988-05-01), Marhin
patent: 4755735 (1988-07-01), Inakagata
patent: 4956597 (1990-09-01), Heavey et al.
patent: 4961043 (1990-10-01), Koenck

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