FIELD COIL FAULT DETECTOR FOR AUTOMOTIVE ALTERNATOR BATTERY CHARGING SYSTEMS

摘要

Detector (94) monitoring the operational status of the field coil circuit in a multiphase alternator (22) and voltage regulator battery charging system. Circuit means (94) monitor a first signal at a first terminal (At) of the field coil circuit. Means (246) generate sampling intervals on a repetitive basis. Circuit means (246) interrupt the excitation signal supplied to the field coil by the voltage regulator during the sampling intervals. A second signal is measured during sampling intervals at a second terminal (field) of the field coil circuit. Comparator means (616) compare the first and second signals and produce an output signal when the comparison varies from a predetermined value.