On the driving techniques for high-brightness LEDS

Ka Hong Loo; Wai Keung Lun; Siew Chong Tan; Y. M. Lai; Chi Kong Tse

doi:10.1109/ECCE.2009.5315972

On the driving techniques for high-brightness LEDS

Ka Hong Loo, Wai Keung Lun, Siew Chong Tan, Y. M. Lai, Chi Kong Tse

The Hong Kong Polytechnic University

Research output: Chapter in book / Conference proceeding › Conference article published in proceeding or book › Academic research › peer-review

11 Citations (Scopus)

Abstract

High-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.

Original language	English
Title of host publication	2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009
Pages	2059-2064
Number of pages	6
DOIs	https://doi.org/10.1109/ECCE.2009.5315972
Publication status	Published - 29 Dec 2009
Event	2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009 - San Jose, CA, United States Duration: 20 Sept 2009 → 24 Sept 2009

Conference

Conference	2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009
Country/Territory	United States
City	San Jose, CA
Period	20/09/09 → 24/09/09

Keywords

Amplitude mode
Bi-level driving
Direct current
High-brightness LEDs
Light-emitting diode
Lighting system
Luminous efficacy
Pulse-width-modulation

ASJC Scopus subject areas

Energy Engineering and Power Technology
Electrical and Electronic Engineering

More information

10.1109/ECCE.2009.5315972

Cite this

@inproceedings{7d7ea8e6ec0546979e506c98eb5940dd,

title = "On the driving techniques for high-brightness LEDS",

abstract = "High-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.",

keywords = "Amplitude mode, Bi-level driving, Direct current, High-brightness LEDs, Light-emitting diode, Lighting system, Luminous efficacy, Pulse-width-modulation",

author = "Loo, {Ka Hong} and Lun, {Wai Keung} and Tan, {Siew Chong} and Lai, {Y. M.} and Tse, {Chi Kong}",

year = "2009",

month = dec,

day = "29",

doi = "10.1109/ECCE.2009.5315972",

language = "English",

isbn = "9781424428939",

pages = "2059--2064",

booktitle = "2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009",

note = "2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009 ; Conference date: 20-09-2009 Through 24-09-2009",

}

TY - GEN

T1 - On the driving techniques for high-brightness LEDS

AU - Loo, Ka Hong

AU - Lun, Wai Keung

AU - Tan, Siew Chong

AU - Lai, Y. M.

AU - Tse, Chi Kong

PY - 2009/12/29

Y1 - 2009/12/29

N2 - High-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.

AB - High-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.

KW - Amplitude mode

KW - Bi-level driving

KW - Direct current

KW - High-brightness LEDs

KW - Light-emitting diode

KW - Lighting system

KW - Luminous efficacy

KW - Pulse-width-modulation

UR - http://www.scopus.com/inward/record.url?scp=72549084003&partnerID=8YFLogxK

U2 - 10.1109/ECCE.2009.5315972

DO - 10.1109/ECCE.2009.5315972

M3 - Conference article published in proceeding or book

SN - 9781424428939

SP - 2059

EP - 2064

BT - 2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009

T2 - 2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009

Y2 - 20 September 2009 through 24 September 2009

ER -

On the driving techniques for high-brightness LEDS

Abstract

Conference

Keywords

ASJC Scopus subject areas

More information

Other files and links

Fingerprint

Cite this