Patent ID: 7015677

Claim:
An automatic voltage regulator of a generator which regulator keeps an output voltage at a predetermined voltage by controlling exciting currents of said generator with turning a switching device on and off depending on a pulse width, the regulator comprising: a voltage detection means for detecting the output voltage of said generator; a deviation calculation means for calculating a deviation for a target voltage with respect to a detected detection voltage; an integral-value calculation means for calculating an integral value of said deviation; a pulse signal calculation means for calculating said pulse width based on an integral coefficient, a proportional coefficient, said deviation, and the integral value of said deviation, and for outputting said pulse width as a pulse signal; and a function for suppressing an overshoot, wherein when before voltage establishment said detection voltage is less than a first reference voltage lower than said set voltage, said target voltage is replaced with a second reference voltage that is not less than said first reference voltage and less than said set voltage; wherein when before voltage establishment said detection voltage is not less than said first reference voltage, said target voltage is replaced with said set voltage; and wherein said switching device inputs said pulse signal calculated by said pulse signal calculation means as a signal of said pulse width.