Characterization of Non-Stable States of Lamp Operation of High Power Lamps

Kettlitz, M.; Zalach, J.; Rarbach, J

doi:10.1109/08ias.2008.252

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2011

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“…Despite these good results it should be reminded that both the ballast and the lamp shape have to be adjusted in order to effectively avoid acoustic resonances as already stated in [2,28].…”

Section: Resultsmentioning

confidence: 99%

Investigation of acoustic resonances in high-power lamps

Kettlitz

Rarbach²,

Zalach

2011

J. Phys. D: Appl. Phys.

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Abstract. High power, medium pressure, mercury containing lamps are used as UV sources for many industrial applications. Lamps investigated in this paper are driven with an electronic ballast with a non-sinusoidal current waveform at a fixed frequency of 20 kHz and a maximum power output of 35 kW. Instabilities can occur if the input power is reduced below 50%. The reason is identified as acoustic resonances in the lamp. Comparison of calculated and measured resonance frequencies shows a good agreement and explains the observed lamp behavior. This led to a development of a new ballast prototype which is able to avoid instabilities by changing the driving frequency in dependence on the applied power.

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Section: Resultsmentioning

confidence: 99%