Electricity: single generator systems – Automatic control of generator or driving means – Voltage of generator or circuit supplied
Patent
1989-02-07
1990-03-20
Salce, Patrick R.
Electricity: single generator systems
Automatic control of generator or driving means
Voltage of generator or circuit supplied
322 25, 361 20, H02J 716
Patent
active
049104519
ABSTRACT:
A voltage regulator circuit for an AC generator of an automobile is disclosed. The circuit comprises, in addition to the conventional elements, a transistor turned on and off in phase with the power transistor by the control transistor of the voltage detecting circuit. The collector of this additional transistor is coupled to the positive terminal of the battery through a resistor, while the emitter thereof is grounded. A serial circuit of a resistor and a capacitor forming a positive feedback circuit is coupled across the collector of this additional transistor and the base of the control transistor, a biasing resistor being coupled across the base and emitter of the control transistor. Thus, when the control transistor is turned on, the charging current of the capacitor produces a forward bias across the base and emitter of the control transistor; when the control transistor is turned off, the discharging current of the capacitor produces a reverse bias thereacross. A Zener diode is coupled across the collector and emitter of the additional transistor to limit the voltage thereacross under a predetermined level. Thus, the capacitor in the feedback circuit is protected from voltage surges.
REFERENCES:
patent: 3943408 (1976-03-01), Jakobs et al.
patent: 4310792 (1982-01-01), Iwatani et al.
patent: 4658200 (1987-04-01), Kouge
Itoh Kenji
Iwatani Shiro
Mitsubishi Denki & Kabushiki Kaisha
Peckman Kristine
Salce Patrick R.
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