Electric lamp and discharge devices: systems – With cathode or cathode heater supply circuit – Automatic cut-out or voltage regulator in the cathode or...
Patent
1995-11-30
1998-10-13
Pascal, Robert
Electric lamp and discharge devices: systems
With cathode or cathode heater supply circuit
Automatic cut-out or voltage regulator in the cathode or...
315225, 315160, 315172, 315360, 315DIG2, 315DIG5, H05B 3904
Patent
active
058216960
ABSTRACT:
Start and operation of high pressure discharge lamps, in which a high-frequency starting voltage U.sub.HF and an operating voltage U.sub.B are furnished to the lamp electrodes includes the steps of: 1) turning on the high-frequency starting voltage U.sub.HF at a starting time t.sub.0 to ionize the lamp filling and preheat the electrodes; 2) turning on the operating voltage U.sub.B after a preheating interval .DELTA.t.sub.H, that is, at time t.sub.1 =t.sub.0 +.DELTA.t.sub.H ; and 3) turning off the starting voltage U.sub.HF at time t.sub.2 .gtoreq.t.sub.1, as a result of which the lamp is then operated solely by means of the operating voltage U.sub.B. As a result, the transfer phase for the development of the arc is shortened. Advantageously, the frequency of the starting voltage is selected such that the product of the frequency f of the starting voltage U.sub.HF and the spacing d between the electrodes meets the condition f.multidot.d.gtoreq.50 kHz.multidot.cm. A circuit arrangement for carrying out this method includes an HF ignition device and an operating device, which are each connected to the electrodes of the lamp via a respective switch, and the two switches are actuated by means of timers.
REFERENCES:
patent: 4291254 (1981-09-01), Arlt et al.
patent: 4331905 (1982-05-01), Owen
patent: 4378514 (1983-03-01), Colllins
patent: 4749914 (1988-06-01), Feher et al.
patent: 5036256 (1991-07-01), Garrison et al.
patent: 5262699 (1993-11-01), Sun et al.
Arlt Joachim
Fromm Dietrich
Pascal Robert
Patent-Treuhand Gesellschaft F. Elektrische Gluehlampen mbH
Philogene Haissa
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