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A motor vehicle power supply device includes an alternator drivable by an engine mounted on a motor vehicle, a battery chargeable by electric energy generated by the alternator, a capacitor connected to the alternator and the battery, and a charging speed varying circuit arrangement connected betwee

A motor vehicle power supply device includes an alternator drivable by an engine mounted on a motor vehicle, a battery chargeable by electric energy generated by the alternator, a capacitor connected to the alternator and the battery, and a charging speed varying circuit arrangement connected between the capacitor, and the alternator and the battery, for varying the speed at which the capacitor is charged. The charging speed varying circuit arrangement is controlled to vary the speed at which the capacitor is charged, depending on the operating condition of the motor vehicle.

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A motor vehicle power supply device for supplying power to a starter, comprising: an alternator drivable by an engine mounted on a motor vehicle; a battery chargeable by electric energy generated by said alternator; capacitor means, connected to said alternator and said battery and switchably connec

A motor vehicle power supply device for supplying power to a starter, comprising: an alternator drivable by an engine mounted on a motor vehicle; a battery chargeable by electric energy generated by said alternator; capacitor means, connected to said alternator and said battery and switchably connectable to the starter, for providing power to the starter; charging speed varying means connected between said capacitor, and said alternator and said battery, for varying the speed at which said capacitor means is charged; detecting means for detecting an operating condition of the motor vehicle; and control means for controlling said charging speed varying means in response to detected signals from said detecting means.