Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1982-07-09
1986-06-03
Chatmon, Saxfield
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315 82, 315172, 315173, 315310, 307 10BP, 320 25, 361 67, 361 78, 361 90, G05F 100, H05B 3702, H05B 3904, H05B 4136
Patent
active
045932336
ABSTRACT:
An alternator circuit comprises an alternator having an armature winding, a field winding, a voltage regulator, a fault detecting circuit, a lamp drive circuit having its input connected to the output of the fault detecting circuit, and a warning lamp driven by the drive circuit. The drive circuit includes a capacitor connected across its input, an input transistor, an output transistor, a current measuring resistor connected in series with the output transistor, and a transistor sensitive to both the voltage drop across the warning lamp and the voltage drop in the current measuring resistor. In the event of excessive current flow through the output transistor, the voltage sensitive transistor rapidly charges the capacitor thereby turning off the output transistor. The capacitor then discharges slowly and the cycle is repeated. The high inrush current in the warning lamp does not cause the capacitor to be charged as the associated voltage drop across the lamp offsets the voltage drop in the current measuring resistor.
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"Modern Electronic Circuits Reference Manual", by John Markus, p. 247.
Taylor Joseph D. F.
Wiley David
Chatmon Saxfield
Lucas Industries Public Limited Company
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