Motor vehicle electrical system.

摘要

A multivoltage electrical system for a motor vehicle that has a pair of storage batteries (50,54) which, in a first charging mode are charged in series from the direct voltage output terminals (28,30) of a bridge rectified (24,25) connected to an alternating current generator (10). In a second charging mode, only one of the batteries (50) is charged and this takes place when a plurality of controlled rectifiers (72) connecting the generator and a common junction (52) of the batteries are gated conductive. The switching between modes is a function of the voltage of one of the batteries and the voltage of a triangular voltage waveform generator (84) operating at a fixed frequency, and/or the system is maintained in the second mode by means (80) when generator speed is below a predetermined value.