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Article: On driving techniques for LEDs: Toward a generalized methodology

TitleOn driving techniques for LEDs: Toward a generalized methodology
Authors
KeywordsBi-level driving
Dc
Diode I-V characteristic
High-brightness LED
Lighting system
Luminous efficacy
Pulsewidth modulation (PWM)
Issue Date2009
Citation
Ieee Transactions On Power Electronics, 2009, v. 24 n. 12, p. 2967-2976 How to Cite?
AbstractLEDs must be externally driven by power sources to emit light. One problem associated with driving LEDs is its inherent nonlinear relation between the emission intensity and the forward current. Thus, the light output obtained from an LED is strongly dependent on the actual current waveforms employed to drive it. It is found that driving an LED with dc produces light output that surpasses all other techniques including the commonly used pulse-width modulation (PWM) technique. On the other hand, for dimming function, it is found that the PWM technique offers greater dimming flexibility in comparison to dc technique. In this paper, a generalized methodology for driving LEDs inheriting the features of both of these techniques is proposed. It employs a pulsating current switching between two discrete current levels, where the current levels and their durations can be concurrently varied for a more precise mapping of the driving conditions to the light output. The existing dc and PWM techniques can be viewed alternatively as being special cases of this more general approach. © 2006 IEEE.
Persistent Identifierhttp://hdl.handle.net/10722/148904
ISSN
2015 Impact Factor: 4.953
2015 SCImago Journal Rankings: 3.005
ISI Accession Number ID
Funding AgencyGrant Number
University Grants Committee of the Hong Kong Special Administrative RegionPolyU 5272/07E
Funding Information:

This work was supported by the University Grants Committee of the Hong Kong Special Administrative Region, Research Grant Council Earmarked Research Grant (ERG) number PolyU 5272/07E. A shortened version of this paper was presented at the IEEE Energy Conversion Congress and Exposition (ECCE), San Jose, CA, USA, September 20-24, 2009. Recommended for publication by Associate Editor M. Alonso.

References

 

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.accessioned2012-06-20T06:16:13Z-
dc.date.available2012-06-20T06:16:13Z-
dc.date.issued2009en_HK
dc.identifier.citationIeee Transactions On Power Electronics, 2009, v. 24 n. 12, p. 2967-2976en_HK
dc.identifier.issn0885-8993en_HK
dc.identifier.urihttp://hdl.handle.net/10722/148904-
dc.description.abstractLEDs must be externally driven by power sources to emit light. One problem associated with driving LEDs is its inherent nonlinear relation between the emission intensity and the forward current. Thus, the light output obtained from an LED is strongly dependent on the actual current waveforms employed to drive it. It is found that driving an LED with dc produces light output that surpasses all other techniques including the commonly used pulse-width modulation (PWM) technique. On the other hand, for dimming function, it is found that the PWM technique offers greater dimming flexibility in comparison to dc technique. In this paper, a generalized methodology for driving LEDs inheriting the features of both of these techniques is proposed. It employs a pulsating current switching between two discrete current levels, where the current levels and their durations can be concurrently varied for a more precise mapping of the driving conditions to the light output. The existing dc and PWM techniques can be viewed alternatively as being special cases of this more general approach. © 2006 IEEE.en_HK
dc.languageengen_US
dc.relation.ispartofIEEE Transactions on Power Electronicsen_HK
dc.subjectBi-level drivingen_HK
dc.subjectDcen_HK
dc.subjectDiode I-V characteristicen_HK
dc.subjectHigh-brightness LEDen_HK
dc.subjectLighting systemen_HK
dc.subjectLuminous efficacyen_HK
dc.subjectPulsewidth modulation (PWM)en_HK
dc.titleOn driving techniques for LEDs: Toward a generalized methodologyen_HK
dc.typeArticleen_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/TPEL.2009.2021183en_HK
dc.identifier.scopuseid_2-s2.0-74349105225en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-74349105225&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume24en_HK
dc.identifier.issue12en_HK
dc.identifier.spage2967en_HK
dc.identifier.epage2976en_HK
dc.identifier.isiWOS:000273136800030-
dc.publisher.placeUnited Statesen_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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