Control device for battery charging AC generator used in motor v

Details Control device for battery charging AC generator used in motor v Control device for battery charging AC generator used in motor v

1993-06-29

1995-09-05

Stephan, Steven L.

Electricity: single generator systems

Automatic control of generator or driving means

Voltage of generator or circuit supplied

322 25, 322 22, H02P 900

Patent

active

054481546

ABSTRACT:
A control device for a battery charging AC generator for a motor vehicle including a power transistor connected in series with a field winding of the AC generator for performing switching control of a current flowing through the field winding. A voltage deviation circuit detects a deviation of the battery voltage from a reference voltage; and a PWM signal generating circuit is responsive to a voltage deviation signal from the voltage deviation circuit for turning the power transister on and off a resistor connected in series with the power transistor detects a current flowing through the field winding; and a current limiting circuit generates a turn off signal for the power transistor when the detected current is determined to have exceeded a reference current. A latch circuit operates in response to a clock signal from the PWM signal generating circuit to limit the frequency of turning on and off of the power transistor to below 1 KHz.

REFERENCES:
patent: 4636706 (1987-01-01), Bowman et al.
patent: 4739243 (1988-05-01), Iwatani
patent: 4754212 (1988-06-01), Mashino
patent: 5079496 (1992-01-01), Pierret et al.
patent: 5105143 (1992-04-01), Marumoto et al.
patent: 5140253 (1992-08-01), Itoh

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