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Method for supplying current to an LED array and circuit arrangement for carrying out the method

A LED array and circuit layout technology, applied in the direction of electric light sources, lighting devices, electrical components, etc., can solve the problems of complex and expensive devices, complex and expensive circuits, etc., and achieve the effect of firm cost and low cost

Active Publication Date: 2012-11-07
海拉有限双合股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Complex and correspondingly expensive installation
[0007] The circuit with the control loop disclosed in US 2004 / 0036418 A1 is also very complex and expensive

Method used

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  • Method for supplying current to an LED array and circuit arrangement for carrying out the method

Examples

Experimental program
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Embodiment Construction

[0024] picture The circuit arrangement shown in is part of a lighting unit which is not shown in detail and forms a spotlight of a motor vehicle and has a power supply 2 electrically connected in series with an LED array 1 . The LED array 1 represents the light source of a motor vehicle spotlight, for example for generating daytime running lights, and is supplied with current by a power supply 2 in the switched-on state of the daytime running lights. The current is adjusted to a predetermined value by the controller 2a.

[0025] Here the LED array 1 has three LED branches 3 electrically connected in series. It is also possible to arrange more or only two LED branches 3 . At least one LED 4 is electrically connected in series in each LED branch 3 . Furthermore, in each LED branch 3 a current measuring device 5 is electrically connected in series with LED 4 .

[0026] The current measuring device 5 has a signal transmission connection with the control electronics 6 , which i...

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PUM

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Abstract

The invention relates to a method for supplying current to an LED array, which comprises at least two LED branches connected in parallel, in each of which at least one LED is arranged. The LED array is supplied with a predetermined current from a current source connected in series, wherein currents in the LED branches are measured, wherein the measured currents are compared in control electronics, and wherein the currents are controlled in some of the LED branches in such a way that the currents in the LED branches have a defined relationship with each other. The method should be improved in such a way that the method can be performed inexpensively and using simple means. This is achieved in that one of the LED branches is selected as a master, the current of which is used as a target specification for the other LED branches. The invention further relates to a circuit arrangement for carrying out the method according to the invention and to a lighting unit having such a circuit arrangement.

Description

technical field [0001] The invention relates to a method for supplying power to an LED array, the LED array comprising at least two LED branches connected in parallel, each having at least one LED. The LED array is supplied with a predetermined current from a series-connected power supply, where the current in the LED branches is measured and compared in the regulation electronics, and the current in a part of the LED branches is controlled such that the currents in all the LED branches are at a level relative to each other determined ratio. [0002] The invention also relates to a circuit arrangement and a corresponding lighting unit for carrying out the method. Background technique [0003] Methods and circuit arrangements of this type are known in the prior art in numerous implementation variants. [0004] A method and a corresponding circuit arrangement for powering an LED array are known, for example, from EP1449408B1. The circuit arrangement of the LED array has at ...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B33/0809H05B45/46H05B45/37
Inventor R·埃德尔迈尔S·凯泽S·默勒
Owner 海拉有限双合股份公司
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