Automatic electric battery charging apparatus

Details Automatic electric battery charging apparatus Automatic electric battery charging apparatus

1975-02-25

1976-09-07

Miller, J D

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 37, 320 39, H02J 704

Patent

active

039796582

ABSTRACT:
An automatic battery charger of taper type has means for comparing a reference signal with a control signal varying with battery voltage, and terminating the charge when the rate of rise of battery voltage falls below a predetermined value. To prevent spurious operation due to mains voltage variation, the control signal comprises the difference between a signal dependent on battery voltage and a signal dependent on a.c. supply voltage.
The rate of rise of the control signal is monitored by comparing it with a staircase reference voltage which is increased by a step whenever the control signal exceeds it, and termination is initiated if the time interval between two steps exceeds a given period. This may be long enough, e.g. half an hour, to provide an equalizing charge without requiring additional equipment.

REFERENCES:
patent: 2420577 (1947-05-01), Van Lew
patent: 3794905 (1974-02-01), Long
patent: 3886427 (1975-05-01), Long
patent: 3886427 (1975-05-01), Long

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