Implementation of Bi-level current driving technique for improved efficacy of high-power LEDs

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

doi:10.1109/ECCE.2009.5316560

Implementation of Bi-level current driving technique for improved efficacy of high-power LEDs

Wai Keung Lun, Ka Hong Loo, 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

7 Citations (Scopus)

Abstract

Presently, amplitude mode (DC mode) and pulse-width modulation (PWM) represent the two main driving techniques used in LED drivers. The dimming function with PWM driving technique is attractive although lower luminous efficacy and stresses on the LEDs due to pulsating power are the disadvantages in comparison to amplitude mode. This paper introduces a current driving technique to improve the luminous efficacy over the conventional PWM technique while maintaining the dimming capability. This is achieved by introducing a DC-offset into the conventional PWM current waveform. It is found that the luminous efficacy increases with increasing DC-offset while the stresses due to pulsating power are reduced. Implementation and verification of the proposed driving technique using a prototype driver are presented.

Original language	English
Title of host publication	2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009
Pages	2808-2814
Number of pages	7
DOIs	https://doi.org/10.1109/ECCE.2009.5316560
Publication status	Published - 28 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

Bi-level current
Buck converter
Control
Dimming
Light-emitting diode (LED)
Luminous efficacy

ASJC Scopus subject areas

Energy Engineering and Power Technology
Electrical and Electronic Engineering

More information

10.1109/ECCE.2009.5316560

Cite this

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title = "Implementation of Bi-level current driving technique for improved efficacy of high-power LEDs",

abstract = "Presently, amplitude mode (DC mode) and pulse-width modulation (PWM) represent the two main driving techniques used in LED drivers. The dimming function with PWM driving technique is attractive although lower luminous efficacy and stresses on the LEDs due to pulsating power are the disadvantages in comparison to amplitude mode. This paper introduces a current driving technique to improve the luminous efficacy over the conventional PWM technique while maintaining the dimming capability. This is achieved by introducing a DC-offset into the conventional PWM current waveform. It is found that the luminous efficacy increases with increasing DC-offset while the stresses due to pulsating power are reduced. Implementation and verification of the proposed driving technique using a prototype driver are presented.",

keywords = "Bi-level current, Buck converter, Control, Dimming, Light-emitting diode (LED), Luminous efficacy",

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

year = "2009",

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doi = "10.1109/ECCE.2009.5316560",

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pages = "2808--2814",

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

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Lun, WK, Loo, KH, Tan, SC, Lai, YM & Tse, CK 2009, Implementation of Bi-level current driving technique for improved efficacy of high-power LEDs. in 2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009., 5316560, pp. 2808-2814, 2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009, San Jose, CA, United States, 20/09/09. https://doi.org/10.1109/ECCE.2009.5316560

Implementation of Bi-level current driving technique for improved efficacy of high-power LEDs. / Lun, Wai Keung; Loo, Ka Hong; Tan, Siew Chong et al.
2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009. 2009. p. 2808-2814 5316560.

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

TY - GEN

T1 - Implementation of Bi-level current driving technique for improved efficacy of high-power LEDs

AU - Lun, Wai Keung

AU - Loo, Ka Hong

AU - Tan, Siew Chong

AU - Lai, Y. M.

AU - Tse, Chi Kong

PY - 2009/12/28

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N2 - Presently, amplitude mode (DC mode) and pulse-width modulation (PWM) represent the two main driving techniques used in LED drivers. The dimming function with PWM driving technique is attractive although lower luminous efficacy and stresses on the LEDs due to pulsating power are the disadvantages in comparison to amplitude mode. This paper introduces a current driving technique to improve the luminous efficacy over the conventional PWM technique while maintaining the dimming capability. This is achieved by introducing a DC-offset into the conventional PWM current waveform. It is found that the luminous efficacy increases with increasing DC-offset while the stresses due to pulsating power are reduced. Implementation and verification of the proposed driving technique using a prototype driver are presented.

AB - Presently, amplitude mode (DC mode) and pulse-width modulation (PWM) represent the two main driving techniques used in LED drivers. The dimming function with PWM driving technique is attractive although lower luminous efficacy and stresses on the LEDs due to pulsating power are the disadvantages in comparison to amplitude mode. This paper introduces a current driving technique to improve the luminous efficacy over the conventional PWM technique while maintaining the dimming capability. This is achieved by introducing a DC-offset into the conventional PWM current waveform. It is found that the luminous efficacy increases with increasing DC-offset while the stresses due to pulsating power are reduced. Implementation and verification of the proposed driving technique using a prototype driver are presented.

KW - Bi-level current

KW - Buck converter

KW - Control

KW - Dimming

KW - Light-emitting diode (LED)

KW - Luminous efficacy

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

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Implementation of Bi-level current driving technique for improved efficacy of high-power LEDs

Abstract

Conference

Keywords

ASJC Scopus subject areas

More information

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