Dual voltage electrical circuit for improved fault indication, especially for an automobile vehicle.

摘要

The invention relates to a dual-voltage alternator circuit, of the type including two alternators (A, Lex; A', Lex') respectively associated with two batteries (B, B') mounted in series with one another, and two means (REG, REG') of controlling the excitation current of the alternators each receiving a DC voltage (VD+, VD+') output by an auxiliary rectifier bridge (Dt, Dt') associated with each alternator, characterised in that it comprises a single operation indicator lamp (LT) connected on the one side to a terminal of a first battery (B') situated opposite the other battery (B) and on the other side on the one hand to the auxiliary rectifier bridge (Dt) of the other battery by way of a voltage offset means (Dz) capable of allowing a current to pass into the lamp when the voltage across its terminals is greater than a predetermined value and on the other hand to the auxiliary rectifier (Dt') of the first battery (B') by way of a one-way conduction means (D2) preventing a current from flowing from one auxiliary rectifier bridge to the other.
Application to fault indication for a dual-voltage circuit with the aid of a single lamp.