A hybrid voltage regulator controls the voltage of three phases of alternating electricity produced by an alternator. A digital voltage regulator produces an average of the RMS voltage for each phase and produces an error value based on a ratio of the voltage to the frequency of the alternating electricity....http://www.google.fr/patents/US7825641?utm_source=gb-gplus-shareBrevet US7825641 - Method and apparatus for regulating excitation of an alternator
Method and apparatus for regulating excitation of an alternator
