Device for detecting broken filaments in lamps

Details Device for detecting broken filaments in lamps Device for detecting broken filaments in lamps

1980-03-04

1982-05-18

Brigance, Gerald L.

Communications: electrical

Condition responsive indicating system

Specific condition

324 83D, G01R 2500

Patent

active

043307787

ABSTRACT:
In a device for detecting broken filaments of lamps which are connected with secondary windings of transformers respectively provided for the lamps, primary windings of the transformers being connected in series across an AC power source through a power control device, there are provided a detector for detecting voltage and current delivered from the power control device, and another detector for detecting a phase difference between the voltage and the current thus detected by the voltage and current detector.

REFERENCES:
patent: 3054991 (1962-09-01), Howell
patent: 3663956 (1972-05-01), Purdy et al.
patent: 3715741 (1973-02-01), McWade et al.
patent: 3820022 (1974-06-01), Watt
patent: 3829735 (1974-08-01), Berlock et al.
patent: 3906361 (1975-09-01), Nessler et al.
patent: 3953794 (1976-04-01), Moore
patent: 4001682 (1977-01-01), Watt

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