A current balancing scheme with high luminous efficiency for high power LED lighting

Xiaohui Qu; Siu Chung Wong; Chi Kong Tse

doi:10.1109/IECON.2013.6699130

A current balancing scheme with high luminous efficiency for high power LED lighting

Xiaohui Qu, Siu Chung Wong, 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

4 Citations (Scopus)

Abstract

The current imbalance in driving LED strings will cause fast degradation or even failure in some LEDs that should be avoided in LED applications. This paper presents a current balancing method based on the pulse-width modulation of a common bus voltage to each LED string to achieve the intended averaged current. For the balance of a common averaged current, a small duty cycle will necessitate a large LED turn-on current amplitude, which may cause temporal overheat and low luminous efficacy of LEDs. An optimal feedback control scheme is proposed to maximize the duty cycles and minimize the bus voltage. As a result, at lease one of the LED string is operating at a unity duty cycle. The analysis, implementation and verification are detailed in this paper.

Original language	English
Title of host publication	Proceedings, IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society
Pages	169-174
Number of pages	6
DOIs	https://doi.org/10.1109/IECON.2013.6699130
Publication status	Published - 1 Dec 2013
Event	39th Annual Conference of the IEEE Industrial Electronics Society, IECON 2013 - Vienna, Austria Duration: 10 Nov 2013 → 14 Nov 2013

Conference

Conference	39th Annual Conference of the IEEE Industrial Electronics Society, IECON 2013
Country/Territory	Austria
City	Vienna
Period	10/11/13 → 14/11/13

Keywords

current balancing
dimming
high power LEDs
luminous efficacy

ASJC Scopus subject areas

Control and Systems Engineering
Electrical and Electronic Engineering

More information

10.1109/IECON.2013.6699130

Cite this

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title = "A current balancing scheme with high luminous efficiency for high power LED lighting",

abstract = "The current imbalance in driving LED strings will cause fast degradation or even failure in some LEDs that should be avoided in LED applications. This paper presents a current balancing method based on the pulse-width modulation of a common bus voltage to each LED string to achieve the intended averaged current. For the balance of a common averaged current, a small duty cycle will necessitate a large LED turn-on current amplitude, which may cause temporal overheat and low luminous efficacy of LEDs. An optimal feedback control scheme is proposed to maximize the duty cycles and minimize the bus voltage. As a result, at lease one of the LED string is operating at a unity duty cycle. The analysis, implementation and verification are detailed in this paper.",

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Qu, X, Wong, SC & Tse, CK 2013, A current balancing scheme with high luminous efficiency for high power LED lighting. in Proceedings, IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society., 6699130, pp. 169-174, 39th Annual Conference of the IEEE Industrial Electronics Society, IECON 2013, Vienna, Austria, 10/11/13. https://doi.org/10.1109/IECON.2013.6699130

A current balancing scheme with high luminous efficiency for high power LED lighting. / Qu, Xiaohui; Wong, Siu Chung; Tse, Chi Kong.
Proceedings, IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society. 2013. p. 169-174 6699130.

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

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N2 - The current imbalance in driving LED strings will cause fast degradation or even failure in some LEDs that should be avoided in LED applications. This paper presents a current balancing method based on the pulse-width modulation of a common bus voltage to each LED string to achieve the intended averaged current. For the balance of a common averaged current, a small duty cycle will necessitate a large LED turn-on current amplitude, which may cause temporal overheat and low luminous efficacy of LEDs. An optimal feedback control scheme is proposed to maximize the duty cycles and minimize the bus voltage. As a result, at lease one of the LED string is operating at a unity duty cycle. The analysis, implementation and verification are detailed in this paper.

AB - The current imbalance in driving LED strings will cause fast degradation or even failure in some LEDs that should be avoided in LED applications. This paper presents a current balancing method based on the pulse-width modulation of a common bus voltage to each LED string to achieve the intended averaged current. For the balance of a common averaged current, a small duty cycle will necessitate a large LED turn-on current amplitude, which may cause temporal overheat and low luminous efficacy of LEDs. An optimal feedback control scheme is proposed to maximize the duty cycles and minimize the bus voltage. As a result, at lease one of the LED string is operating at a unity duty cycle. The analysis, implementation and verification are detailed in this paper.

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A current balancing scheme with high luminous efficiency for high power LED lighting

Abstract

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Keywords

ASJC Scopus subject areas

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