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Automotive lamp with compensation of the luminous flux of the light source

A technology for motor vehicles and motor vehicles, applied in the direction of light sources, electric light sources, electroluminescence light sources, etc., can solve problems such as undisclosed circuits

Active Publication Date: 2018-11-02
VALEO VISION SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the European patent application does not disclose how the circuit is actually implemented

Method used

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  • Automotive lamp with compensation of the luminous flux of the light source
  • Automotive lamp with compensation of the luminous flux of the light source
  • Automotive lamp with compensation of the luminous flux of the light source

Examples

Experimental program
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Effect test

Embodiment Construction

[0053] figure 1 The graph 100 shows the temporal evolution of the luminous flux 101 provided by a motor vehicle light comprising at least one LED as light source without compensation for the luminous flux loss due to the temperature increase of the light source.

[0054] It will be appreciated that at a first moment 110 (when the light source is still cool or at ambient temperature, e.g. after 1 minute of activation) and at a second moment 111 (when due to its prolonged operation, e.g. after 30 minutes of use After that, the light source is already very hot) with a reduction in luminous flux 101. The reduction of the luminous flux 101 at the second moment 111 can be, for example, 10% or more, 15% or more, 20% or more, 25% or even more relative to the luminous flux 101 at the first moment 110; for example The luminous flux 101 at the second instant 111 may be 95 lumens, while at the first instant 110 the luminous flux 101 may be 115 lumens. As the temperature of the light sou...

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PUM

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Abstract

An automotive lamp (200) comprises: a light source (202, 601-603) driven by an electric current (301, 401); and an electronic circuit (204, 800, 850) configured to modify the electric current (301, 401) driving the light source (202, 601-603); the electronic circuit (204, 800, 850) comprises a plurality of discrete analog electronic components; the electronic circuit (204, 800, 850) is configured:to modify the electric current (301, 401) driving the light source (202, 601-603) so as to drive the light source (202, 601-603) with a first electric current IL1 (310) or with a second electric current IL2 (320); to switch from the first electric current IL1 (310) to the second electric current IL2 (320) when a temperature T of the light source (202, 601-603) increases and exceeds a first temperature level TL1inc (330); and to switch from the second electric current IL2 (320) to the first electric current IL1 (310) when the temperature T increases and exceeds a second temperature level TL2inc (340); the second electric current IL2 (320) is greater than the first electric current IL1 (310); and the second temperature level TL2inc (340) is greater than the first temperature level TL1inc (330). Also, a method for driving a light source (202, 601-603) of an automotive lamp (200).

Description

technical field [0001] The invention relates to the field of lighting devices. More specifically, the present invention relates to a motor vehicle lamp that compensates for heat loss of a light source and is capable of preventing the light source from overheating. Background technique [0002] It is well known that LED-driven light sources have many advantages, one of the important advantages is that they are more efficient than halogen or xenon light sources: LEDs can provide higher lumens per watt than halogen or xenon light sources. This is one of the main reasons for the general popularity of LEDs in lighting fixtures. For similar reasons, the automotive industry is also working hard to use LEDs for motor vehicle lights. [0003] Contrary to the advantages, the disadvantage of LEDs is that the light they provide is not constant: the luminous flux radiated by the LEDs varies according to the temperature of the LEDs, specifically, the luminous flux decreases as the tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/56H05B45/30H05B47/17H05B45/18B60Q1/0088B60Q1/20G01K7/021
Inventor 米盖尔-安吉尔·佩娜曼纽尔·卡尔美斯塔安东尼奥·多明戈·伊兰约安-乔瑟·圣提埃拉米盖尔·安吉尔·坎迪杜
Owner VALEO VISION SA