REGULATOR FOR A POLYPHASE ALTERNATOR FOR A MOTOR VEHICLE

A regulator for a polyphase alternator for a motor vehicle, the regulator including detector means for detecting a voltage difference between the phase terminals that are to receive the phase voltages from said alternator, and means for detecting a trigger signal for triggering operation in an accelerated mode, wherein the means for detecting a trigger signal comprise means for detecting a particular level of the voltage or current on at least one of the phase terminals, and means for triggering accelerated mode operation when said voltage or current level is detected, and wherein the detector means for detecting a voltage difference between the phase terminals are suitable for detecting said voltage difference at the said current or voltage level on said phase terminal.