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Title: Implementation of Bi-level current driving technique for improved efficacy of high-power LEDs
Authors: Lun, WK
Loo, KH 
Tan, SC
Lai, YM 
Tse, CK 
Keywords: Bi-level current
Buck converter
Light-emitting diode (LED)
Luminous efficacy
Issue Date: 2009
Source: 2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009, 2009, 5316560, p. 2808-2814 How to cite?
Journal: 2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009 
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.
Description: 2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009, San Jose, CA, 20-24 September 2009
ISBN: 9781424428939
DOI: 10.1109/ECCE.2009.5316560
Appears in Collections:Conference Paper

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