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: Contribution to journalArticlepeer-review

22 Citations (SciVal)

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
Original languageEnglish
Pages (from-to)5498-5507
Number of pages10
JournalIEEE Transactions on Power Electronics
Volume29
Issue number10
Early online date20 Nov 2013
DOIs
Publication statusPublished - 1 Oct 2014

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