Patent ID: 6271649
Filing Date: 2001-08-07
Classification: H02J,Y02T

Abstract:
A control apparatus for a vehicle AC generator comprising:an AC generator having an output voltage regulated by controlling a quantity of a field current flowing through a field coil of said AC generator;a voltage regulator having a transistor connected to said field coil for performing on/off-control of the field current flowing through said field coil with a predetermined duty ratio;a frequency-voltage converter connected to an armature coil of said AC generator for detecting a rotation frequency of said AC generator and converting the rotation frequency to a voltage;a constant current circuit having a transistor with base and collector electrodes which receive the voltage output from said frequency-voltage converter; anda smoothing circuit having a transistor operative to discharge a voltage, wherein the collector and emitter electrodes of the transistor connected in parallel to a capacitor and a base electrode connected to the base and collector electrodes of the constant current source, wherein a discharging time constant of said smoothing circuit decreases as the rotation speed detected by said frequency-voltage converter increases, andwherein the output voltage of said AC generator increases gradually up to a predetermined value in conformance with the discharge characteristics of the discharging time constant.