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Conference Paper: On the driving techniques for high-brightness LEDS

TitleOn the driving techniques for high-brightness LEDS
Authors
Loo, KHLun, WKTan, SCLai, YMTse, CK
KeywordsAmplitude mode
Bi-level driving
Direct current
High-brightness LEDs
Light-emitting diode
Lighting system
Luminous efficacy
Pulse-width-modulation
Issue Date2009
Citation
2009 Ieee Energy Conversion Congress And Exposition, Ecce 2009, 2009, p. 2059-2064 How to Cite?
DOI: http://dx.doi.org/10.1109/ECCE.2009.5315972
AbstractHigh-brightness light-emitting diodes (HBLEDs) are conventionally driven in the amplitude mode (AM) or pulse-width-modulation (PWM) mode. High luminous efficacy is obtained with AM, but precise dimming is difficult to achieve and such AM-driven LEDs suffer from significant color variations. PWM offers excellent dimming capability and color stability but the LEDs acquire lower luminous efficacies compared to AM. The advantageous features of both conventional methods can be united in a single generalized methodology as proposed in this paper. It utilizes pulsating current while enables simultaneous adjustments of the current levels and duty cycle for achieving a predetermined luminous efficacy and dimming range of interest to the users. The dimming dynamics using the proposed method is investigated through a detailed parametric study by experiments and numerical calculations. © 2009 IEEE.
Persistent Identifierhttp://hdl.handle.net/10722/148984
References
References in Scopus

 

DC FieldValueLanguage
dc.contributor.authorLoo, KHen_HK
dc.contributor.authorLun, WKen_HK
dc.contributor.authorTan, SCen_HK
dc.contributor.authorLai, YMen_HK
dc.contributor.authorTse, CKen_HK
dc.date.accessioned2012-06-20T06:17:29Z-
dc.date.available2012-06-20T06:17:29Z-
dc.date.issued2009en_HK
dc.identifier.citation2009 Ieee Energy Conversion Congress And Exposition, Ecce 2009, 2009, p. 2059-2064en_HK
dc.identifier.urihttp://hdl.handle.net/10722/148984-
dc.description.abstractHigh-brightness light-emitting diodes (HBLEDs) are conventionally driven in the amplitude mode (AM) or pulse-width-modulation (PWM) mode. High luminous efficacy is obtained with AM, but precise dimming is difficult to achieve and such AM-driven LEDs suffer from significant color variations. PWM offers excellent dimming capability and color stability but the LEDs acquire lower luminous efficacies compared to AM. The advantageous features of both conventional methods can be united in a single generalized methodology as proposed in this paper. It utilizes pulsating current while enables simultaneous adjustments of the current levels and duty cycle for achieving a predetermined luminous efficacy and dimming range of interest to the users. The dimming dynamics using the proposed method is investigated through a detailed parametric study by experiments and numerical calculations. © 2009 IEEE.en_HK
dc.languageengen_US
dc.relation.ispartof2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009en_HK
dc.subjectAmplitude modeen_HK
dc.subjectBi-level drivingen_HK
dc.subjectDirect currenten_HK
dc.subjectHigh-brightness LEDsen_HK
dc.subjectLight-emitting diodeen_HK
dc.subjectLighting systemen_HK
dc.subjectLuminous efficacyen_HK
dc.subjectPulse-width-modulationen_HK
dc.titleOn the driving techniques for high-brightness LEDSen_HK
dc.typeConference_Paperen_HK
dc.identifier.emailTan, SC:sctan@hku.hken_HK
dc.identifier.authorityTan, SC=rp01606en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1109/ECCE.2009.5315972en_HK
dc.identifier.scopuseid_2-s2.0-72549084003en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-72549084003&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.spage2059en_HK
dc.identifier.epage2064en_HK
dc.identifier.scopusauthoridLoo, KH=7003558724en_HK
dc.identifier.scopusauthoridLun, WK=35230435400en_HK
dc.identifier.scopusauthoridTan, SC=26642772000en_HK
dc.identifier.scopusauthoridLai, YM=7401512093en_HK
dc.identifier.scopusauthoridTse, CK=7103295097en_HK

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