Constant current source and battery charger

Details Constant current source and battery charger Constant current source and battery charger

1987-12-02

1989-05-09

Hickey, R. J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 31, 320 35, 320 39, 323278, 323289, H02J 710

Patent

active

048292591

ABSTRACT:
A constant current battery charger includes a bucking regulator comprising a power switch transistor, a diode, an inductor and a voltage sensitive switch with adjustable delay for controlling the power switch transistor. The hysteresis or delay is obtained with a Schmitt trigger and the effect is a stable pulse width modulator in which the duty cycle of the power switch transistor is varied. A temperature sensor adds resistance to change the sensitivity of the switch and reduce charging current when a predetermined battery temperature is reached. A speed up circuit consisting of a shorting transistor is connected across the base-emitter of the switch transistor.

REFERENCES:
patent: 3602794 (1971-08-01), Westhaver
patent: 3835368 (1974-09-01), Williams
patent: 4472672 (1984-09-01), Pacholok
patent: 4577144 (1986-05-01), Hodgman et al.
patent: 4710695 (1987-12-01), Yamada et al.
patent: 4739199 (1988-04-01), Shigekane
patent: 4754389 (1988-06-01), Moberg

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