Patent ID: 8581558

Claim:
A control device for a vehicle AC generator, in which a DC voltage obtained by rectifying an AC output voltage of an armature coil in said AC generator that has said armature coil and a field coil with a rectifier is applied to said field coil to obtain a field current, and the field current is controlled, said control device for the vehicle AC generator comprising: a switching element connected to said field coil in order to control the field current; and a control signal processing unit, in which information as to whether said field coil is connected to a high potential side or connected to a low potential side is inputted, one of a high potential side terminal and a low potential side terminal is selected on the basis of the inputted information, a control signal is outputted, and ON/OFF control of said switching element is performed to control the field current of said field coil, wherein said control signal processing unit selects the low potential side terminal and performs ON/OFF control of said switching element to control the field current of said field coil when the inputted information indicates that said field coil is connected to the high potential side, and wherein said control signal processing unit selects the high potential side terminal and performs ON/OFF control of said switching element to control the field current of said field coil when the inputted information indicates that said field coil is connected to the low potential side.