Electronic voltage regulator protected against failure due to ov

Electricity: single generator systems – Automatic control of generator or driving means – Plural conditions

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322 28, H02H 706

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active

053250443

ABSTRACT:
An electronic voltage regulator, particularly a regulator of the voltage of a field coil of an alternator within a motor vehicle, is protected against catastrophic failure of its output transistor due to a short-circuit overload by action of a direct current (d.c.) electrical path within the circuit of the regulator. The d.c. path, preferably a single diode, discharges an existing capacitor present within an alternating current (a.c.) feedback path between the regulator's output transistor and its error amplifier stage. This discharge causes the output transistor to break into a safe, and non-destructive, oscillation for the duration of any overload. The same electronic voltage regulator is further, optionally, protected against a catastrophic failure of its output transistor due to a loss of the reference voltage supplied to the regulator. This protection is obtained by action of yet another, second, direct current (d.c.) electrical path. This second d.c. path, preferably a single resistor, serves, upon loss of a reference voltage to the voltage regulator, to couple voltage produced by the magnetic field within the field winding of the alternator back to the error amplifier stage of the regulator. This coupled voltage causes the error amplifier stage to, in turn, drive the regulator's output bipolar transistor to a condition where, by action of the first and the second paths, the bipolar transistor is safely maintained in an oscillatory condition until the reference voltage is restored.

REFERENCES:
patent: 3843921 (1974-10-01), Hill
patent: 3855517 (1974-12-01), Allport
patent: 4187525 (1980-02-01), Nagura et al.
patent: 4570198 (1986-02-01), Storti et al.
patent: 4570199 (1986-02-01), Morishita et al.
patent: 4658200 (1987-04-01), Kouge

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