Timed fast charger

Details Timed fast charger Timed fast charger

1980-06-23

1981-10-27

Hickey, Robert J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 23, 320 37, H02J 704

Patent

active

042976308

ABSTRACT:
In a charger for rechargeable electrochemical cells, a transformer charging circuit supplies a charging current to the battery at a fast charge rate for a predetermined time followed by a continuous slow charge rate. A normally closed automatic reset thermostat in series with the rectifier diodes in the charging circuit, and thermally coupled to them, opens after a period of time, dependent upon the heat generated by the rectifier diodes and upon the thermal mass of the thermostat and diodes, and terminates the fast charge current. A resistor, shunted across the thermostat and thermally coupled to it, establishes a slow charge rate current path when the thermostat opens. Heat generated in the resistor causes the thermostat to remain open as long as the battery is connected and AC power is supplied to the transformer primary winding.

REFERENCES:
patent: 2955245 (1960-10-01), Payne et al.
patent: 3457489 (1969-07-01), Gentry, Jr. et al.
patent: 3465230 (1969-09-01), Ball
patent: 3538415 (1970-11-01), Wilson
patent: 3681673 (1972-08-01), Weinstock
patent: 3911350 (1975-10-01), Swope
Ball, "There's No Overcharge for Fast-Charged Batteries", Electronics, Jan. 22, 1968, pp. 97-100.

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