Dual voltage motor vehicle electrical system

Details Dual voltage motor vehicle electrical system Dual voltage motor vehicle electrical system

1986-10-30

1988-02-02

Hickey, R. J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

322 90, 307 16, H02J 700, H02J 714

Patent

active

047231050

ABSTRACT:
A dual voltage motor vehicle electrical system wherein batteries are series connected across the direct voltage output terminals of a generator. The system has a DC to DC converter that operates in a first mode as an equalizer to maintain the batteries in a substantially equal state of charge. When an electric starting motor is energized to crank the engine of the vehicle the converter is switched to a second mode of operation wherein it provides a substantially constant output voltage that is applied to certain electrical loads on the vehicle that require a stable voltage. The converter responds to a first reference voltage that is provided by a voltage divider connected across the batteries when operating in the first mode and responds to a second reference voltage provided by a constant voltage device when operating in the second mode. The system switches between the reference voltages, depending upon the mode of operation that is being used.

REFERENCES:
patent: 3667025 (1972-05-01), Campbell et al.
patent: 3671843 (1972-06-01), Huntzinger et al.
patent: 4236107 (1980-11-01), Templin
patent: 4479083 (1984-10-01), Sullivan
patent: 4491779 (1985-01-01), Campbell et al.
patent: 4492912 (1985-01-01), Nowakowski

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