Disconnection detecting circuit of double-filament spherical lam

Details Disconnection detecting circuit of double-filament spherical lam Disconnection detecting circuit of double-filament spherical lam

1979-12-28

1982-02-09

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

With signal, indicator, or alarm

Plural load device systems

315 64, 315135, 315136, H05B 3900, H05B 3703

Patent

active

043151965

ABSTRACT:
A fault detection apparatus for use with a double-filament lamp utilizes the temperature-related changes in resistance of the non-energized filament to indicate a break in the energized filament. The circuit of the apparatus includes, for each filament, a first voltage dividing network in parallel with the filament and which includes the other filament as a voltage dividing resistance and a second voltage dividing network including the filament which establishes a reference voltage. A comparator is activated to energize a warning lamp when the sensed voltage at a specific voltage dividing point in the network is changed due to the temperature-related changes in the resistance value of the non-energized filament when the energized filament is broken.

REFERENCES:
patent: 3735378 (1973-05-01), McNamee

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