Circuit for constant voltage power source

Details Circuit for constant voltage power source Circuit for constant voltage power source

1978-09-15

1980-06-10

Hickey, Robert J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 15, 320 61, H02J 700, H02J 714

Patent

active

042075114

ABSTRACT:
This specification discloses a circuit for a constant voltage power source. The circuit includes a vehicle charging means, such as an alternator, which charges a main battery designed for operating main vehicle electrical loads such as a starter motor and a secondary battery, designed for operating secondary vehicle electrical loads such as electronic components particularly sensitive to voltage variations and typically requiring a constant voltage input for operation. A resistor in series with the vehicle charging means and the secondary battery limits the rate of charging of the secondary battery. The main vehicle loads can be selectively connected to the circuit for operation by the vehicle charging means and/or the main battery. A diode in series with the secondary battery prevents the secondary battery from discharging through any path but the secondary vehicle loads. The secondary vehicle loads are connected across the secondary battery but can also receive current from any of the main battery, secondary battery and the vehicle charging means. When sufficient current and voltage is not available for the secondary vehicle loads from the main battery and the vehicle charging system, such as during cold cranking of the starter motor, the needed power can be supplied from the secondary battery. This is particularly advantageous because the secondary vehicle loads can include electronic circuits necessary for proper ignition of the vehicle engine.

REFERENCES:
patent: 1898370 (1933-02-01), Hughes et al.
patent: 2044917 (1936-06-01), Richardson
patent: 3264545 (1966-08-01), Kott
patent: 3457491 (1969-07-01), Black et al.
patent: 3463995 (1969-08-01), Herold
patent: 3603973 (1971-09-01), Houch
patent: 3829753 (1974-08-01), Marshall
patent: 3846422 (1972-02-01), Hankly
patent: 3921049 (1975-11-01), Mellops et al.
patent: 3949289 (1976-04-01), Day
patent: 4004208 (1977-01-01), Tamminen

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