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What are the applications of ceramic substrates in car headlights

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  The car's low beam,high beam,and front headlights can not only provide lighting,but also can communicate with other drivers through the alternation of far and low beams.At present,many automobiles take into account the requirements of heat dissipation and performance,and use ceramic substrates as important parts of the lamp.

  Types and advantages of car headlamps.

  Automobile headlamps are mainly divided into halogen headlamps,xenon headlamps,and LED headlamps.The three types actually have advantages.The halogen headlamps have simple structure,low cost,and strong penetration in rain and fog.The illumination brightness is relatively low,and the xenon headlamps that generate large heat have high brightness,long life,low power consumption,and high brightness,but the penetration of rain and fog weather is not strong,and they cannot be lit immediately

  LED headlamps have heat dissipation problems in the use of automotive headlamps.

  However,in the eyes of the big lamp owner Audi,the shortcomings of LEDs may not be shortcomings.They are also popular and lead the trend of the industry.In order to ensure the market and position in their fields,various automakers have made efforts to surpass the Audi lamp factory,and they have worked hard on automobile headlamps.LED headlamps have become popular in recent years.But in short,it's impossible for automakers to really not care about the shortcomings of light-emitting diodes.The brightness of LED headlights is related to power.The greater the power,the higher the temperature,and the faster the brightness decays because it cannot dissipate immediately.

  Since LED is a family with difficult heat dissipation,is it good to provide conditions that are conducive to heat dissipation?In feasible methods,the meticulous cooling design and the enlargement effect of the heat sink are not ideal,but only very ideal effects can be achieved.The function of the LED heat sink is to absorb the heat generated by the chip and conduct it to the heat sink to realize heat exchange with the outside of the chip.


ceramic substrate


  What are the characteristics of an ideal heat sink substrate for LEDs?

  As an ideal heat dissipation substrate for light-emitting diodes,physical,chemical and electrical must have the following characteristics:

  1.Good chemical stability and corrosion resistance.

  2.High thermal conductivity,thermal expansion coefficient matching the chip material.

  3.Low dielectric constant and dielectric loss.

  4.Good electrical insulation and high mechanical strength.

  5.Low price and easy to process.

  6.Low density and non-toxic.

  What is the commonly used automotive headlamp LED heat sink substrate on the market?

  In the automotive headlamp industry,the main substrates used are aluminum substrates,aluminum nitride substrates,and alumina substrates.The thermal conductivity of the aluminum substrate is higher than that of the plastic substrate,but it requires a better heat dissipation design when used in car headlights.Otherwise,the junction temperature is still high,the cost of high-cost alumina substrates such as fan radiators in the heat dissipation design is low,and the heat dissipation is much stronger than that of aluminum substrates.But now automobile companies increase the brightness of headlamps and LED powers are getting higher and higher.Alumina substrates are no longer enough.
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