Self-configurable current-mirror circuit with short-circuit and open-circuit fault tolerance for balancing parallel light-emitting diode (LED) string currents

Sinan Li; S.Y. Ron Hui

doi:10.1109/TPEL.2013.2291392

Self-configurable current-mirror circuit with short-circuit and open-circuit fault tolerance for balancing parallel light-emitting diode (LED) string currents

Sinan Li
, S.Y. Ron Hui

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

27 Citations (Scopus)

Abstract

Current imbalance among parallel light-emitting diode (LED) strings could put excessive current and thermal stress on some of the LEDs in the systems, resulting in reduction in system lifetime. For LED road lighting systems, reliability is the paramount factor. This paper first explains how existing current-mirror (CM) circuits cannot cope with LED open-circuit faults and then describes a self-configurable CM circuit that can withstand open-circuit faults in LED systems with parallel LED strings. The ability to withstand open-circuit faults means that the LED systems can still function with reduced luminous output even if one LED string is cut off. The proposed circuit, which retains the feature of not requiring an auxiliary dc power supply, has been practically implemented and successfully tested in a 70-W LED system with three parallel strings. © 1986-2012 IEEE.

Original language	English
Article number	6670759
Pages (from-to)	5498-5507
Journal	IEEE Transactions on Power Electronics
Volume	29
Issue number	10
DOIs	https://doi.org/10.1109/TPEL.2013.2291392
Publication status	Published - Oct 2014
Externally published	Yes

Bibliographical note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Funding

This work was supported in part by the Hong Kong Research Grant Council under Theme-Based Research Project T22–715–12 N.

Research Keywords

Current mirror circuits
current sharing methods
light-emitting diode technology

RGC Funding Information

RGC-funded

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10.1109/TPEL.2013.2291392

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title = "Self-configurable current-mirror circuit with short-circuit and open-circuit fault tolerance for balancing parallel light-emitting diode (LED) string currents",

abstract = "Current imbalance among parallel light-emitting diode (LED) strings could put excessive current and thermal stress on some of the LEDs in the systems, resulting in reduction in system lifetime. For LED road lighting systems, reliability is the paramount factor. This paper first explains how existing current-mirror (CM) circuits cannot cope with LED open-circuit faults and then describes a self-configurable CM circuit that can withstand open-circuit faults in LED systems with parallel LED strings. The ability to withstand open-circuit faults means that the LED systems can still function with reduced luminous output even if one LED string is cut off. The proposed circuit, which retains the feature of not requiring an auxiliary dc power supply, has been practically implemented and successfully tested in a 70-W LED system with three parallel strings. {\textcopyright} 1986-2012 IEEE.",

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Self-configurable current-mirror circuit with short-circuit and open-circuit fault tolerance for balancing parallel light-emitting diode (LED) string currents. / Li, Sinan; Hui, S.Y. Ron.
In: IEEE Transactions on Power Electronics, Vol. 29, No. 10, 6670759, 10.2014, p. 5498-5507.

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

TY - JOUR

T1 - Self-configurable current-mirror circuit with short-circuit and open-circuit fault tolerance for balancing parallel light-emitting diode (LED) string currents

AU - Li, Sinan

AU - Hui, S.Y. Ron

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 2014/10

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N2 - Current imbalance among parallel light-emitting diode (LED) strings could put excessive current and thermal stress on some of the LEDs in the systems, resulting in reduction in system lifetime. For LED road lighting systems, reliability is the paramount factor. This paper first explains how existing current-mirror (CM) circuits cannot cope with LED open-circuit faults and then describes a self-configurable CM circuit that can withstand open-circuit faults in LED systems with parallel LED strings. The ability to withstand open-circuit faults means that the LED systems can still function with reduced luminous output even if one LED string is cut off. The proposed circuit, which retains the feature of not requiring an auxiliary dc power supply, has been practically implemented and successfully tested in a 70-W LED system with three parallel strings. © 1986-2012 IEEE.

AB - Current imbalance among parallel light-emitting diode (LED) strings could put excessive current and thermal stress on some of the LEDs in the systems, resulting in reduction in system lifetime. For LED road lighting systems, reliability is the paramount factor. This paper first explains how existing current-mirror (CM) circuits cannot cope with LED open-circuit faults and then describes a self-configurable CM circuit that can withstand open-circuit faults in LED systems with parallel LED strings. The ability to withstand open-circuit faults means that the LED systems can still function with reduced luminous output even if one LED string is cut off. The proposed circuit, which retains the feature of not requiring an auxiliary dc power supply, has been practically implemented and successfully tested in a 70-W LED system with three parallel strings. © 1986-2012 IEEE.

KW - Current mirror circuits

KW - current sharing methods

KW - light-emitting diode technology

UR - https://www.scopus.com/pages/publications/84902213413

UR - https://www.scopus.com/pages/publications/84902213413#tab=impact

U2 - 10.1109/TPEL.2013.2291392

DO - 10.1109/TPEL.2013.2291392

M3 - RGC 21 - Publication in refereed journal

SN - 0885-8993

VL - 29

SP - 5498

EP - 5507

JO - IEEE Transactions on Power Electronics

JF - IEEE Transactions on Power Electronics

IS - 10

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ER -

Self-configurable current-mirror circuit with short-circuit and open-circuit fault tolerance for balancing parallel light-emitting diode (LED) string currents

Abstract

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Research Keywords

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