Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Induction-type discharge device load
Patent
1992-01-15
1993-09-07
Mis, David
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Induction-type discharge device load
315224, 315226, 315307, 315DIG2, 315DIG4, 315DIG5, H05B 4129, H05B 4139
Patent
active
052432610
ABSTRACT:
A circuit arrangement suitable for operating low-pressure mercury discharge lamp by means of a high-frequency current includes circuitry (I) for generating the high-frequency current from a supply voltage, and a modulator (II) for the substantially square-wave modulation of the amplitude of the high-frequency current at a modulation frequency f. The circuit arrangement is further provided with circuitry (V) for limiting the amplitude of the re-ignition voltage across the low-pressure mercury discharge lamp to a voltage Vi. As a result, interference with infrared systems caused by a discharge lamp operated by the circuit arrangement is substantially fully suppressed.
REFERENCES:
patent: 4219760 (1980-08-01), Ferro
patent: 4734624 (1988-03-01), Nagase et al,.
patent: 4766350 (1988-08-01), Husgen et al.
Bergervoet Jozef R. M.
De Bijl Andrianus M. J.
Konings Leonardus U. E.
Schlejen Jacob
Wessels Johannes H.
Mis David
U.S. Philips Corporation
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