Lamp fault detector

Details Lamp fault detector Lamp fault detector

2007-07-17

2007-07-17

Tran, Thuy V. (Department: 2821)

Electric lamp and discharge devices: systems

Plural series connected load devices

Condenser in the supply circuit

C315S362000, C315S240000, C315S315000, C307S13200T, C307S1320EA

Reexamination Certificate

active

11101664

ABSTRACT:
The continuity of a series-wired, lamp circuit is restored after interruption caused by failure of a lamp filament by providing a control relay that is wired in parallel with each lamp. A power resistor having a resistive load substantially the same as that of a lamp filament is arranged in series with the relay contacts, which are normally open. The failure of a lamp filament causes a high voltage to be impressed across the coil of the relay, causing it to pick up and its contacts to close, thus substituting the resistor for the lamp filament and restoring continuity to the circuit.

REFERENCES:
patent: 4536695 (1985-08-01), Lin
patent: 5886423 (1999-03-01), Gershen et al.
patent: 6518707 (2003-02-01), Gershen et al.
patent: 6765313 (2004-07-01), Janning

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