Control apparatus for charging generator

In a control apparatus for a charging generator comprising a battery charged by a rectified output of an AC generator having a field coil and a voltage regulator for controlling a field current passing through the field coil to control the output voltage of the generator in a predetermined value, an improvement which comprises;

• a parallel combination of a first resistor and a first thermistor having a positive temperature coefficient which detects the variation of ambient temperature of the voltage regulator to impart a negative temperature gradient to the voltage adjusting characteristic of the voltage regulator,
• said first thermistor being thermally isolated from the generator and the voltage regulator, and
• said voltage regulator comprising a series combination comprising second, third and fourth resistors connected to said parallel combination and a second thermistor connected in parallel with said fourth resistor and having a negative temperature coefficient which detects the self-heating of the generator or the voltage regulator during the operation to impart a positive temperature gradient to the voltage adjusting characteristic.