Voltage regulator device for vehicular AC generator

Details Voltage regulator device for vehicular AC generator Voltage regulator device for vehicular AC generator

1994-03-23

1996-02-20

Stephan, Steven L.

Electricity: single generator systems

Automatic control of generator or driving means

Voltage of generator or circuit supplied

322 69, 322 99, 320 61, H02H 706, H02J 700

Patent

active

054932025

ABSTRACT:
A voltage regulator circuit 3A for a vehicular AC generator 1 includes, in addition to the conventional voltage detector and transistors, a bypass PNP transistor 315 for supplying base current to the power transistor 305 upon disconnection of the line A from the battery 4. When the engine is started and the AC generator i is driven, a small voltage is induced in the armature coil 101 due to the residual magnetism in the core of the field coil 102 even when the line A is disconnected from the battery 4. A smoothed voltage developed at the junction point between a resistor 312 and a capacitor 313 coupled serially between a phase of the armature coil 101 and ground turns on the NPN transistor 311, thereby grounding the base of the PNP transistor 315 through a resistor 314. The PNP transistor 316 is thus turned on, and the base current of the power transistor 305 is supplied through the PNP transistor 315 via the bypass line B.

REFERENCES:
patent: 4471287 (1984-09-01), Morishita et al.
patent: 4549128 (1985-10-01), Morishita et al.
patent: 5132605 (1992-07-01), Boella et al.
patent: 5184060 (1993-02-01), Iwatani

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