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Fail-safe LED system

An LED system, fail-safe technology, used in electrical components, electroluminescent light sources, light circuit layout, etc.

Inactive Publication Date: 2018-11-23
EATON INTELLIGENT POWER LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, when an LED fails, the pn junction may form an open circuit through which current cannot pass in either direction

Method used

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  • Fail-safe LED system
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Examples

Experimental program
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Embodiment Construction

[0022] Various examples will be described in detail with reference to the drawings, wherein like reference numerals indicate like parts and assemblies throughout the several views. Any examples set forth in this disclosure are not intended to be limiting, and merely set forth some of the many possible ways for implementing the broad inventive aspects disclosed herein.

[0023] figure 1 A prior art LED system 20 is depicted comprising four LED strings 22a-22d (collectively LED strings 22) arranged in parallel with respect to each other. LED string 22 extends between an anode side 24 and a cathode side 26 of LED system 20 . A constant current LED driver 28 (ie, a constant current power supply) is coupled to the anode side 24 of the LED system 20 . Each LED string 22 includes at least one LED 23, and when the LED string 22 includes a plurality of LEDs 23, the LEDs 23 are arranged in series with respect to each other. Constant current LED driver 28 provides constant current to ...

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PUM

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Abstract

The present disclosure relates to a fail-safe LED system including an LED circuit arrangement. The LED circuit arrangement includes a plurality of LED strings arranged in parallel with respect to eachother. The LED circuit arrangement is supplied with electrical current from a constant current power supply. The fail-safe LED system includes structure for detecting a in at least one of the LED strings a failure that causes increased current to pass through remaining operational LED strings of the plurality of LED strings. The fail-safe LED system also includes a current correction string arranged in parallel with respect to the plurality of LED strings. When activated in response to the detection of a failure, the current correction string accommodates current from the constant current power supply such that the current passing through each operational LED string is reduced to a corrected current level.

Description

[0001] Cross References to Related Applications [0002] This application was filed as a PCT International Patent Application on April 10, 2017, and claims the benefit of U.S. Patent Application No. 62 / 320,674, filed April 11, 2016, the disclosure of which is incorporated by reference in its entirety This article. technical field [0003] The technology is generally related to light emitting diodes ("LEDs"). More specifically, the technology relates to parallel string LED systems. Background technique [0004] Light-emitting diodes (LEDs) convert electricity into light using the phenomenon of electroluminescence. The core structural element of an LED is the pn junction. A pn junction is an interface defined between two types of semiconductor material (eg, p-type and n-type) within a semiconductor crystal. A pn junction conducts electricity in only one direction. Therefore, LEDs will only emit light when installed with the correct electrical polarity. When a voltage is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B37/03H05B44/00
CPCH05B45/56H05B45/52H05B45/397H05B45/46
Inventor J·M·马纳汉张慧
Owner EATON INTELLIGENT POWER LTD