Voltage regulating circuitry to vary the alternator field coil d

Details Voltage regulating circuitry to vary the alternator field coil d Voltage regulating circuitry to vary the alternator field coil d

1991-11-29

1993-07-06

Stephan, Steven L.

Electricity: single generator systems

Automatic control of generator or driving means

Voltage of generator or circuit supplied

322 22, H02J 714

Patent

active

052257649

ABSTRACT:
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 a 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.

REFERENCES:
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patent: 5061889 (1991-10-01), Iwatani et al.
patent: 5105143 (1992-04-01), Marumoto et al.
patent: 5140253 (1992-08-01), Itoh

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