Voltage regulator of vehicle alternator

Details Voltage regulator of vehicle alternator Voltage regulator of vehicle alternator

1996-04-22

1997-12-30

Stephan, Steven L.

Electricity: single generator systems

Automatic control of generator or driving means

Voltage of generator or circuit supplied

322 36, 322 99, H02J 704

Patent

active

057034729

ABSTRACT:
Voltage of a terminal at a high impedance is set to a fixed voltage (2.5 V) by a constant current source and a resistor, and whether the voltage of the terminal is a fixed voltage which is between 3.5 V and 5.5 V or not is detected by comparators and a NOR circuit. A control signal is sent from an ECU to the terminal to turn on a switching transistor to lower a divided voltage so that the alternator generates a high voltage only when the voltage of the terminal is the special voltage, and generates normal voltage otherwise. In case of disconnection of the communication line or grounding of the communication line, or when the battery voltage is applied to the communication line, the voltage of the terminal does not become abnormal voltage but become the normal voltage. Thus, abnormal voltage may not applied to the battery.

REFERENCES:
patent: 4602205 (1986-07-01), Matsuhashi et al.
patent: 4716355 (1987-12-01), Morishita et al.
patent: 4985670 (1991-01-01), Kaneyuki
patent: 5206553 (1993-04-01), Imai et al.
patent: 5497117 (1996-03-01), Nakajima et al.
patent: 5572112 (1996-11-01), Saeki et al.
patent: 5581172 (1996-12-01), Iwatani et al.

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