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Conference Paper: A comparative study of random switching schemes for eliminating visible striations in fluorescent lamps

TitleA comparative study of random switching schemes for eliminating visible striations in fluorescent lamps
Authors
KeywordsBallasts (Lamp)
Electric Currents
Electric Inverters
Electrochemical Electrodes
Harmonic Analysis
Issue Date2003
PublisherIEEE
Citation
Pesc Record - Ieee Annual Power Electronics Specialists Conference, 2003, v. 3, p. 1006-1011 How to Cite?
AbstractThis paper presents a comparative study of using random switching modulation schemes for the resonant inverter in electronic ballasts to eliminate visible striation (appearance of black and white bands along the tube) in fluorescent lamps. As striations can be eliminated by superimposing a small amount of dc current or low frequency ac current to the electrodes to produce composite current waveform through the lamp, the underlying principle of this work is based on the fact that random switching introduces low-frequency harmonics at the inverter output. Although this inherent low-frequency generation characteristics is generally undesirable for switching converters requiring high quality output, it provides a favorable means to eliminate striations in this particular application. Modulation schemes under investigation include random pulse position modulation, randomized pulse width modulation (RPWM) and randomized carrier frequency modulation. Issues addressed include the effectiveness of each scheme in eliminating the striations and the randomness level on lamp flickers. Among the schemes, RPWM is found to be the best choice as it introduces largest amount of low-frequency lamp current. The validity of the analyses Is confirmed experimentally by using a T8 36W prototype.
Persistent Identifierhttp://hdl.handle.net/10722/137005
ISSN
References

 

DC FieldValueLanguage
dc.contributor.authorLee, SSTen_HK
dc.contributor.authorChung, HSHen_HK
dc.contributor.authorHui, SYRen_HK
dc.date.accessioned2011-07-29T02:14:05Z-
dc.date.available2011-07-29T02:14:05Z-
dc.date.issued2003en_HK
dc.identifier.citationPesc Record - Ieee Annual Power Electronics Specialists Conference, 2003, v. 3, p. 1006-1011en_HK
dc.identifier.issn0275-9306en_HK
dc.identifier.urihttp://hdl.handle.net/10722/137005-
dc.description.abstractThis paper presents a comparative study of using random switching modulation schemes for the resonant inverter in electronic ballasts to eliminate visible striation (appearance of black and white bands along the tube) in fluorescent lamps. As striations can be eliminated by superimposing a small amount of dc current or low frequency ac current to the electrodes to produce composite current waveform through the lamp, the underlying principle of this work is based on the fact that random switching introduces low-frequency harmonics at the inverter output. Although this inherent low-frequency generation characteristics is generally undesirable for switching converters requiring high quality output, it provides a favorable means to eliminate striations in this particular application. Modulation schemes under investigation include random pulse position modulation, randomized pulse width modulation (RPWM) and randomized carrier frequency modulation. Issues addressed include the effectiveness of each scheme in eliminating the striations and the randomness level on lamp flickers. Among the schemes, RPWM is found to be the best choice as it introduces largest amount of low-frequency lamp current. The validity of the analyses Is confirmed experimentally by using a T8 36W prototype.en_HK
dc.languageengen_US
dc.publisherIEEEen_US
dc.relation.ispartofPESC Record - IEEE Annual Power Electronics Specialists Conferenceen_HK
dc.subjectBallasts (Lamp)en_US
dc.subjectElectric Currentsen_US
dc.subjectElectric Invertersen_US
dc.subjectElectrochemical Electrodesen_US
dc.subjectHarmonic Analysisen_US
dc.titleA comparative study of random switching schemes for eliminating visible striations in fluorescent lampsen_HK
dc.typeConference_Paperen_HK
dc.identifier.emailHui, SYR:ronhui@eee.hku.hken_HK
dc.identifier.authorityHui, SYR=rp01510en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-0042658154en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0042658154&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume3en_HK
dc.identifier.spage1006en_HK
dc.identifier.epage1011en_HK
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridLee, SST=7601392076en_HK
dc.identifier.scopusauthoridChung, HSH=7404007467en_HK
dc.identifier.scopusauthoridHui, SYR=7202831744en_HK

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