Constant current source and battery charger

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

1988-11-16

1989-12-05

Hickey, R. J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 39, 323289, H02J 710

Patent

active

048855227

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 current foldback circuit includes a zener diode coupled to the battery for changing the sensitivity of the switch to substantially reduce charging current when a battery voltage corresponding to a fully charged state is reached.

REFERENCES:
patent: 3602794 (1971-08-01), Westhaver
patent: 3835368 (1974-09-01), Williams
patent: 4472672 (1984-09-01), Pacholock
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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