Electrical voltage supply system

Abstract

An electrical voltage supply system includes an alternator having phase windings, it being possible to connect the alternator to a battery, and which is part of a first vehicle electrical system. The output of the alternator leads via a rectifier bridge and a voltage transformer operating as a step-up transformer to a second vehicle electrical system which has a markedly higher voltage and has usually no battery. To supply voltage to the loads of the vehicle electrical system which is operated at a higher voltage even during a standstill of the alternator, the alternator is then connected to the battery of the vehicle electrical system, and the higher voltage is obtained with the assistance of the step-up transformer, the step-up transformer operating in such a manner that is uses the alternator inductance as a choke.

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