Apparatus for operating a discharge lamp and a lighting unit hav

Details Apparatus for operating a discharge lamp and a lighting unit hav Apparatus for operating a discharge lamp and a lighting unit hav

1991-12-24

1993-08-17

Mis, David

Electric lamp and discharge devices: systems

With automatic shunt and/or cutout

Plural shunts and/or cut-outs

315119, 315225, H05B 3703, H05B 4129

Patent

active

052372421

ABSTRACT:
Apparatus for operating a discharge lamp comprising a high frequency circuit, sensing means for sensing the absence of an electrical connection between the circuit and the lamp and control means for receiving a non-connection signal and for sending a decrease control signal to the high frequency circuit for decreasing the high frequency power supplied to the lamp in response to the non-connection signal. The sensing means senses the absence of an electrical connection between the circuit terminal to which an electric potential is applied which is less than that applied to the other circuit terminal. By sensing the electrical non-connection between the circuit terminal having the lower potential, it is not necessary to sense the absence of a connection at the other end of the lamp.

REFERENCES:
patent: 4503363 (1985-03-01), Nilssen
patent: 4667131 (1987-05-01), Nilssen
patent: 4710682 (1987-12-01), Zuchtriegel
patent: 4914558 (1990-04-01), Flickinger
patent: 4926096 (1990-05-01), Nilssen
patent: 5004955 (1991-04-01), Nilssen
patent: 5015923 (1991-05-01), Nilssen
patent: 5023519 (1991-06-01), Nilssen
patent: 5039919 (1991-08-01), Nilssen

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