Lighting device for vehicles

A technology for lighting equipment and vehicles, used in lighting and heating equipment, lighting devices, vehicle components, etc., can solve problems such as hindering the uniformity of light distribution, different LED brightness, and shortening the service life of LEDs.

Inactive Publication Date: 2018-04-17
ZKW GRP GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

) These different currents can lead to several disadvantages: Current asymmetry can lead to thermal overloading of the LED and, associated with it, a reduction in the lifetime of the LED
Different currents also lead to different LED brightness and thus hamper the uniformity of the light distribution

Method used

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  • Lighting device for vehicles
  • Lighting device for vehicles
  • Lighting device for vehicles

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0021] first refer to figure 1 ,Should figure 1 A certain number of branches ZW1 , ZW2 , . In this case arranged in series with two light emitting diodes D11 , D12 ; D21 , D22 ; . . . ; Dn1 , Dn2. The parallel connection of these branches ZW1 , . . . , ZWn is fed by a power supply 1 , which is controlled, for example, by a differential amplifier 2 which detects the current flowing through the series resistance Rg. The power supply 1 is designed together with a differential amplifier 2 to control the power supply to a predefinable constant current, and the power supply 1 contains a voltage source (not shown here), for example a motor vehicle battery. However, power supplies comprising the aforementioned controls are known and do not form the subject-matter of the present invention.

[0022] If according to figure 1 As can be deduced, each of the series resistances R1, R2, ..., Rn is bridged by a conductor part LA1, LA2, ..., LAn provided in any on the conductor support. I...

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PUM

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Abstract

The invention relates to a lighting device for vehicles, having at least two LED branches (ZW1, ZW2... ZWn) connected in parallel, each branch having at least one series resistor (R1... Rn) and at least one LED (D11... Dn2) in a series circuit. The at least one series resistor (R1... Rn) of each branch (ZW1... ZWn) is bridged by a conductor portion (LA1... LAn) provided on a conductor support, said conductor portion being accessible to a tool, by means of which the conductor portion can be severed. In order to symmetrize the branches, the current flowing through each branch and / or the brightness of at least one LED in each branch is measured, and in branches in which the measured current and / or the measured brightness exceeds a specifiable threshold, the bridging conductor portion of the at least one series resistor is severed by means of the tool.

Description

technical field [0001] The invention relates to a lighting device for a vehicle having at least two LED branches connected in parallel, wherein each branch has at least one series resistor and at least one LED connected in series. [0002] The invention also relates to a method for symmetrizing a branch of a lighting device for a vehicle having at least two LED branches connected in parallel, wherein each branch has at least one series resistor connected in series and at least an LED. Background technique [0003] The use of LEDs as light sources for vehicle lighting systems with different light functions opens, inter alia, new design possibilities with regard to the configuration of the individual light functions. The key parameter here is the number of LEDs used for each light function. Due to different designs of eg headlights, the number of LEDs also varies considerably. A typical number under normal circumstances is one to ten LEDs operated in series for each light f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02H05B44/00
CPCH05K1/0293H05B45/46Y02B20/30H05B47/10H05B45/375H05B45/48H05B45/10F21S41/143B60Q1/0088H02M3/1582
Inventor E.维伯D.基伊斯林格M.比伊森伯格
Owner ZKW GRP GMBH
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