Communications: electrical – Selective – Having indication or alarm
Patent
1979-12-28
1982-07-27
Waring, Alvin H.
Communications: electrical
Selective
Having indication or alarm
340635, 340511, 320 48, G08B 2100
Patent
active
043420222
ABSTRACT:
A warning lamp arrangement for a vehicle battery charging system comprises three resistors (16, 17, 18) connecting a point (19) to the output terminals of an alternator stator winding (10). The said point (19) is connected to the positive terminal of the battery (12) through a resistor (20) and to its negative terminal through a zener diode (34) and a resistor (35). A pair of comparators (21, 22) having their outputs connected to the base of a Darlington transistor (28, 30) detect if the voltage at the said point (19) is outside a predetermined range. The junction of the zener diode (34) and its as associated resistor (35) is also connected to the base of the Darlington transistor (28, 30). A warning lamp (32) connected in the collector circuit of the Darlington transistor is energized if the alternator does not produce an output or a malfunction occurs in the charging system.
REFERENCES:
patent: 3305774 (1967-02-01), Heath
patent: 3656135 (1972-04-01), Ruff
patent: 3764879 (1973-10-01), Hill
patent: 3781633 (1973-12-01), Iwaki et al.
patent: 3820009 (1974-06-01), Itoh et al.
patent: 3855517 (1974-12-01), Allport
patent: 4254396 (1981-03-01), Saudax
Lucas Industries Limited
Waring Alvin H.
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