Battery charger

Details Battery charger Battery charger

1976-05-18

1978-05-02

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, 320 39, H02J 704

Patent

active

040877337

ABSTRACT:
A battery charger in which full-wave rectified current is supplied to a battery through a silicon controlled rectifier. By controlling the gating of the SCR the average charging current is controlled. An oscillator circuit formed by a unijunction transistor with a timing capacitor in its emitter circuit provides the necessary gating pulses. The charging rate of the capacitor is controlled to alter the period during which the SCR is conductive. This control of the charging rate is provided by a circuit responsive to battery voltage and by a circuit responsive to charging current. A portion of the battery-voltage responsive circuit acts to short-circuit the capacitor to stop charging in the event that the battery is connected with reverse polarity. A high charging-rate mode is controlled by a timer circuit which overrides the normal voltage and current control circuits.

REFERENCES:
patent: 3586955 (1971-06-01), Kisiel
patent: 3930197 (1975-12-01), Saylor
patent: 3944904 (1976-03-01), Hase

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