Detrimental effect of a small amount of ripple in a metal halide system

Olsen, Jo; Moskowitz, W.P.; Sylvania, O.

doi:10.1109/ias.2005.1518656

Cited by 10 publications

(2 citation statements)

References 8 publications

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“…This is in accordance with the result of Olsen's experiment in (Olsen 2005). Olsen found that a power ripple of 0.84 percent at the resonance frequency can change the maximum arc tube temperature up to 5°C.…”

Section: Conclusion and Discussionsupporting

confidence: 91%

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Allowed Level of the Power Ripple in Low Frequency Square-Wave Ballasts of Metal-Halide Lamps

Afshar

2006

LEUKOS

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In order to avoid the acoustic instabilities in metal halide (MH) lamps a proper method is to supply the lamp with a low frequency square-wave current. Due to the topology of electronic ballasts for such an application, there is a high frequency ripple in the current or voltage waveform. It is known that such ripples with sufficient energy at the proper frequency are able to excite acoustic resonance in MH lamps. The threshold value for high frequency ripples in order to excite an acoustic mode and destabilize the lamp is under debate. This threshold is lamp dependent and should be measured experimentally for each lamp type. This paper addresses an automated experimental method to determine the threshold value of the power ripple in a frequency range of 10 -400 kHz. The implementation of the proposed method which is based on the light flicker factor has been explained in a preceding paper. The experimental results show that less than 1 percent of power ripple at the resonance frequency is sufficient to excite a detectable (perceptible to the human eye) acoustic instability.

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Section: Conclusion and Discussionsupporting

confidence: 91%

“…The acceptable value of the power ripple of the electronic ballasts is an open question for the industry and standard organizations (Olsen 2005). This value is a lamp characteristic and should be determined for all lamp types which are supposed to be supplied with an electronic ballast.…”

Section: Introductionmentioning

confidence: 99%