Explain the full Raiders of high-brightness LED package thermal design
In the past, LEDs can only be used as the status indicator. The heat dissipation of the package has never been a problem. However, in recent years, the brightness and power of LEDs have been actively improved, and they have been used in applications such as backlighting and electronic lighting. The problem has quietly emerged. The above-mentioned teachings are somewhat confusing. Isn’t the brightness of LEDs ever exceeded today? In 2003, Lumileds Lighting company Roland Haitz based on an empirical technique inferred from past observations. Starting from the first commercial LED in 1965, in the development of these 30 years, LEDs are about every 18 months. It can double the brightness in 24 months, and in the next 10 years, the brightness can be increased by 20 times, and the cost will be reduced to 1/10 of the existing one. This is also the Haitz law that has been popular in recent years. It is considered to be the Moore law of the LED industry.
According to Haitz's law, LEDs with a brightness of 100 lm/W (100 lumens per watt) were in 2008; they appeared in 2010, but the actual development seems to be more advanced than the law. Nichia Chemical Industry (Nichia, June 2006) ) Engineering samples of up to 100lm/W white LEDs have been available and are expected to be officially put into mass production by the end of the year.
Haitz's law can be said to be the Moore's law in the field of LEDs. According to Roland Haitz, LEDs can double the luminous efficiency every 18 to 24 months in the past 30 years, and thus estimate the next 10 years (2003) ; 2013) will grow 20 times more brightness, but the price will be only 1/10 of the current. Not only the brightness continues to increase, but also the heat dissipation technology of LED has been improved. In 1992, the thermal resistance of an LED was 360 °C / W, and then dropped to 125 ° C / W, 75 ° C / W, 15 ° C / W, Now it is at the level of 6 ° C / W ~ 10 ° C / W, more simply, in the past, for every watt of LED power consumption, the temperature will increase by 360 ° C, now it is the same consumption of 1 watt of electricity, but the temperature is only Rise 6 ° C ~ 10 ° C.
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