Voltage regulating circuitry to vary the alternator field coil drive at a rate dependent upon a rotor velocity signal.

摘要

Regulator circuitry for connection to field coils of an alternator in an electrical system of a vehicle having a system voltage maintained by the alternator includes circuitry for providing a variable drive to the field coils of the alternator, and circuitry for generating a velocity signal related to a rotational velocity of a driven shaft of the alternator. The regulator circuitry also includes circuitry for producing a deviation signal when the system voltage deviates more than a predetermined amount from a predetermined value, and circuitry responsive to the deviation signal to vary the field coil drive to the alternator at a rate dependent upon the velocity signal. In addition method is presented for regulating the voltage delivered by an alternator in an electrical system having a system voltage maintained by the alternator. The method includes the steps of determining when the system voltage deviates from a nominal value more than a predefined amount; and when the system voltage deviation occurs, varying a pulse width modulation signal to drive the field coils of the alternator at a rate that is related to a rotational velocity of a stator of the alternator. <IMAGE>