Control apparatus for a vehicular alternator

Electricity: single generator systems – Automatic control of generator or driving means – Voltage of generator or circuit supplied

Reexamination Certificate

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C322S036000

Reexamination Certificate

active

11367315

ABSTRACT:
A control apparatus for a vehicular alternator can improve its reliability and reduce its cost by attenuating a field current of a rotor coil with a simple circuit. The apparatus includes an armature coil, a rectifier circuit, a rotor coil and a voltage control circuit. The rectifier circuit has an AC input terminal, a positive and a negative output terminal. The voltage control circuit controls a generation voltage to be substantially constant by interrupting a field current when a generation voltage exceeds a first predetermined voltage, while passing the field current when the generation voltage is equal to or lower than the first predetermined voltage. A circulation circuit comprising a diode and a current attenuation element serves to circulate the field current upon interruption thereof. A short-circuiting circuit short-circuits the current attenuation element. A short-circuit control circuit opens the short-circuiting circuit when the generation voltage exceeds a second predetermined voltage.

REFERENCES:
patent: 4262243 (1981-04-01), Mori et al.
patent: 5719484 (1998-02-01), Taniguchi et al.
patent: 5719486 (1998-02-01), Taniguchi et al.
patent: 5726557 (1998-03-01), Umeda et al.
patent: 6664767 (2003-12-01), Takahashi et al.
patent: 6803747 (2004-10-01), Taniguchi et al.
patent: 2003-174799 (2003-06-01), None

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