Patent ID: 6037753
Filing Date: 2000-03-14
Classification: H02J

Abstract:
A control device for a vehicle alternator having an output winding, a field coil, an auxiliary permanent magnet for supplying magnetic field in addition to magnetic field generated by said field coil supplied with electric current, said control device comprising:a voltage regulator for regulating output voltage of said alternator by controlling said electric current supplied to said field coil;a generation-condition detecting circuit having a frequency sensor of said output voltage and a comparator for comparing a frequency of said output voltage with a reference value, said generation-condition detecting circuit allowing said voltage regulator to supply said field coil with controlled electric current only when said frequency of said output voltage is higher than said reference value; anda power source circuit connected to said output winding for supplying electric power to said generation-condition detecting circuit from said output winding when said output voltage becomes equal to or higher than a voltage that is generated when said electric current is not supplied to said field coil.