Battery charging circuit

Details Battery charging circuit Battery charging circuit

1981-01-27

1983-03-08

Pellinen, A. D.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 35, 320 60, 363 19, 363 97, H02J 710

Patent

active

043762638

ABSTRACT:
A battery charging circuit having an electromagnetic transformer with primary and secondary coils, a rectifier connected between the secondary coil and the battery, a first transistor connected in series with the primary coil and a resistor to form a circuit in parallel with a power source, the base of the first transistor being connected to the secondary coil, and a second transistor electrically connected to the base of the first transistor. The first transistor has a high switching frequency, and the battery is charged with a constant reverse current during its blocking phase, regardless of the power source voltage. The first transistor is protected from reverse kick-back voltage pulses induced during its blocking phase by the provision of a diode and Zener diode connected in series across the primary coil and a capacitor interposed between the secondary coil and the base of the first transistor.

REFERENCES:
patent: 3435320 (1969-03-01), Lee et al.
patent: 3702961 (1972-11-01), Erickson
patent: 3943423 (1976-03-01), Hoffman
patent: 3963973 (1976-06-01), Vermolen
patent: 3964487 (1976-06-01), Judson
patent: 4001668 (1977-01-01), Lewis
patent: 4080646 (1978-03-01), Dietrich
patent: 4081729 (1978-03-01), Payne et al.
patent: 4128798 (1978-12-01), Takei
patent: 4323961 (1982-04-01), Josephson

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