Patent ID: 8125195
Filing Date: 2012-02-28
Classification: H02P

Abstract:
1. A control apparatus for an in-vehicle electric generator configured to adjust a generation voltage to a predetermined voltage, by on/off-controlling a magnetic-field current in a constant cycle, and variably controlling an adjustment voltage, based on an input signal from an external control unit, comprising: a power transistor that is connected in series to a magnetic-field coil of the electric generator, the magnetic-field current being controlled through connection and disconnection of the power transistor; a control transistor that detects the adjustment voltage corresponding to an output voltage of the electric generator so as to control the conductivity of the power transistor; a holding circuit that holds the cut-off state of the power transistor; a trigger-pulse generator that continues and discontinues in a constant cycle the holding state held by the holding circuit; and a hold-release means for, when a signal from the external control unit changes, interrupting on/off-controlling of the magnetic-field current in the constant cycle.