How to apply the LED technology to the headlamp

The lighting system car can give the driver to understand the actual condition of the car, but also provides safe driving process, the necessary conditions. The new generation of light source LED, which is no stranger to many consumers, has been further expanded to be applied to the car, and in accordance with the various applications in the face of the effectiveness of different needs, select the appropriate LED products. Basically, the LED with the traditional light source in addition to differences in appearance, shape and light output efficiency also has the very big difference, therefore, to improve the application of LED in automotive headlights, including optical design and thermal design, the design concept and the traditional automobile lamps are different. The car and LED were successfully integrated into the new design principles of automotive manufacturing.

Automotive light source occupies a pivotal position in the field of lighting, and its output accounts for about 10% of the total output of the lighting source. If all the lights of a car into LED, about 400 to 600 LED. In fact, as early as 10 years ago, LED on the journey to enter the automotive field. At present, the proportion of LED in the vehicle interior and exterior lighting source has exceeded 80%.

LED as a car headlight source there are objections

Thus, the control of the main body control system must be designed according to the different power requirements of the lamp source. From another point of view, from the application of LED in the car, although the LED in the application of the third brake lights, to the car taillights, steering lights to the brake lights, a step by step to create a LED as a vehicle interior and exterior lighting.

At the 2010 Beijing auto show, BMW showed a GranCoupe four concept coupe. GranCoupe deliberately created in the night under the design of the atmosphere appeared, the visual center of gravity naturally fell on its sharp styling LED headlights. More than BMW, Mercedes-Benz, Audi, Lexus also launched a variety of models equipped with LED headlights. Audi released from the first paragraph of the use of LED headlight R8 has more than 2 years, known as the fourth generation of automotive lighting source LED are emerging high-end models.

In the standard LED headlights on the LexusRX450h forum, is hot RX450h LED headlights. "Even in front of the sound of the car's bumper, the tangent is also a very light blue light, and even my headlights are better than the rest of the identification of it. "A netizen Lu Yu RX450h describe the actual effect of LED headlamp. And another RX450h owners refuted the road, as long as the owner is to open the RX450h must be very clear, LED headlights super bright, very focused, although it does not seem too bright side. LED than the HID light source is also concentrated, especially the traffic lights to stop the car in front of the bumper along the very bright, very safe and very bright mountain road. "The original owners for double B fans (BMW, Benz), since the Lexus transform.

For the performance comparison of LED and HID headlights, more good find two cars factory equipped with HID and LED headlights in the evening 17:30 test models. In the distance from the cement wall 20m test results show that, LED headlights brighter than HID, but a little back LED is not as good as HID headlights.

LED consumption per unit of energy produced by the light output is indeed higher than incandescent, but a single LED than, LED light output advantage is less prominent. In order to get enough brightness, it is necessary to use LED module lighting. "A LED module is not able to provide enough light for high beam and near light. Therefore, you need to use multiple LED modules for each near light and high beam. "PaulDecloedt pointed out that since the car headlights are beam applications, each LED module requires an optical component (lens or reflector). "This is a main reason for the LED beam lights and high beam price is still more expensive. In addition, due to the characteristics of the modular lighting LED also led to difficult to define the rules of the car using multiple modules LED headlight is damaged.

Solve the problem of LED heat dissipation is the key to future development

Because the input LED power about 90% of the energy conversion must be discharged, than the traditional light source to many high; in addition, LED grains are classified in the semiconductor material can not withstand high temperatures (< 120 C), by the hot exhaust to the atmosphere of the grain allows only about 50 DEG C temperature difference, it is far less than traditional lighting, therefore, thermal design is one of the topics in the traditional light source LED light source lamp using difference, plus not on the cooling fan, and lighting products can be extended to cars to market penetration, optical design principle also have to consider further the appearance and the lamp, it will be a high power LED lighting equipment for the problem.

Strictly speaking, the use of traditional lamp heat generated is much higher than LED; however, the traditional lamp will not reduce its light output capacity, but because of the high temperature, light output of LED is due to interface problems, the LED luminous efficiency is affected. And the heat generated by its scattered into the external environment and its packaging structure material is closely related to the use of heat and related materials. One of the concept of thermal resistance, on behalf of the input W power, the need to increase the number of K temperature to heat. The existing package technology allows the highest LED operating at 185 C (LumiledK2), but generally because of packaging adhesive material, the allowable operating temperature of about 125 DEG C, in addition to considering the light output efficiency, but also consider packaging adhesive material modification, for example, resin material in coated LED crystal when, if easy to produce in high temperature aging.

There are vendors to develop "thermal temperature superconducting technology, the heat generated by LED poly heat dispersion effect; that is to say, when the temperature in the LED lamp