Patent ID: 6034512
Filing Date: 2000-03-07
Classification: G01R,H02P

Abstract:
A regulator for a polyphase alternator for a motor vehicle, the regulator including detector means for detecting a voltage difference between phase terminals for receiving phase voltages from said alternator, wherein said detection means include at least one transistor circuit forming a current mirror whose two branches are connected at one end to respective ones of the two phase terminals and are powered via their other ends by transistors forming current sources which deliver currents of the same magnitude to said branches, the two branches also having resistors of different resistances such that one of the transistors of the circuits forming current sources is limited to a predetermined current when a voltage difference greater than a given threshold appears between the two phase terminals, said limit giving rise to a change in the level of a voltage-controlled logic output at a point of said branch between the transistor forming a current source and the transistor of the circuit forming a current mirror.