Method for operating light emitting diode and circuit arrangement

A technology of light-emitting diodes and driving units, applied in the field of circuit devices, can solve the problems of persistent damage of light-emitting diodes, heating of light-emitting diodes, etc., and achieve the effect of avoiding damage and realizing voltage measurement.

Inactive Publication Date: 2011-08-17
OSRAM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] When working with light-emitting diodes, excessive heating of the light-emitting diodes is to be avoided, since permanent damage to the light-emitting diodes can occur in this case

Method used

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  • Method for operating light emitting diode and circuit arrangement
  • Method for operating light emitting diode and circuit arrangement
  • Method for operating light emitting diode and circuit arrangement

Examples

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Embodiment Construction

[0022] represented by 100 as a whole and in figure 1 The video projection device shown schematically in includes light-emitting diodes, where a light-emitting diode 10 is shown symbolically. The driver circuit 12 supplies these light-emitting diodes with a light-emitting diode current ILED. The current intensity ILED is determined according to a specification V which is established by a control unit 14 outside of the driver 12 and supplied to the driver 12 . This specification determines the current intensity of the individual light-emitting diodes 10 such that the light emitted by the light-emitting diodes has a predetermined color locus. That is, the chromaticity coordinates are determined by the current intensity ILED.

[0023] It is provided that V is determined in the range of regulation, ie the control unit 14 regulates according to a predetermined chromaticity coordinate or a predetermined intensity of the light emitted by the light-emitting diode 10 . Specifying V m...

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PUM

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Abstract

An LED arrangement comprises a control unit 14 which makes stipulations V that are implemented by a driver circuit 12 which supplies a LED current (ILED) to LEDs 10; the control unit 14 adjusts its stipulations V in response to the measurements of the light emitted by the LEDs 10; the driver 12 makes a corrective intervention if the temperature of the driver unit and / or LEDs 10 and / or the voltage dropped across the latter deviate from normal values; however, if the driver 12 makes the check pulses 32 not to change, the dimming to the LEDs 10 caused by the intervention of the driver 12 is not compensated by adjustment.

Description

technical field [0001] The invention relates to a method for operating a light-emitting diode arrangement according to the preamble of claim 1 . The invention also relates to a circuit arrangement according to the preamble of claim 3 . Background technique [0002] A light-emitting diode arrangement is understood to be an arrangement having at least one light-emitting diode unit. Typically, a light emitting diode arrangement includes a plurality of light emitting diode units. Such a light-emitting diode arrangement is, for example, part of a projection system with which bright images are produced. The corresponding light-emitting diode units are powered via the driver unit. In the projection device, the control unit determines the value of the current intensity (current intensity value) for the respective light-emitting diode unit. This value is transmitted to the drive unit and implemented by the drive unit. This implementation generally involves emitting current pulse...

Claims

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Application Information

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IPC IPC(8): H05B37/02H05B44/00
CPCH05B33/0818H05B33/0869H05B45/22H05B45/30H05B45/56H05B45/14H05B45/50H05B45/37H05B45/00
Inventor 弗雷德里克·亨佩尔曼拉尔夫·希英伯恩哈德·赖特尔
Owner OSRAM GMBH
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