结温英文

什么是LED：LED是英文light emitting diode（发光二极管）的缩写，它的基本结构是一块电致发光的半导体材料，置于一个有引线的架子上，然后四周用环氧树脂密封，加上合适的电压就能正常发光。LED光源的特点：1． 电压：LED使用低压电源，供电电压在1.8-3.6V之间，根据产品不同而异，所以它是一个比使用高压电源更安全的电源，特别适用于公共场所。2． 效能：消耗能量较同光效的白炽灯减少80%3． 稳定性：理论上可以点亮10万小时。4． 光衰：随着科技的进步，光衰越来越小。现在普通LED灯在一千小时以内的光衰已经可以真正控制在5%以内，即使超过一千小时以后，光衰也很小。5．环保：无辐射，无污染，真真正正的环保材料。出口时LED产品一般免检。LED芯片的尺寸常识：按外形分类，芯片一般分为圆片和方片。其中圆片相对较低档，性能不够稳定；方片一般以尺寸大小来衡量，比如12 mil (1 mil =0.0254平方毫米)。一般来说，同一品牌的芯片，芯片尺寸越大，亮度越高。红光和黄光一般在9~12mil，白，蓝，绿光一般都在12~14mil，这也是市面上最常用的芯片，如果用更大的芯片，亮度虽然可以提高不少，但是芯片价格大幅度提高，这就是为什么大尺寸芯片很少有人采用的原因。LED的颜色常识：LED的不同颜色是由其不同波长的芯片决定的，比如，红光芯片一般波长是620~630nm （纳米），绿光芯片一般波长是527nm, 蓝光芯片的一般波长是470nm, 黄光芯片的一般波长是585nm, 白光LED用的也是蓝光芯片，只是在蓝光芯片上加上适量的的荧光粉就发出白光了。

This paper firstly introduces the structure, shine LED the principle and LED the junction temperature and its causes and then focuses on the discussion from the point of view of experiment of high-power blue LED the junction temperature and spectral characteristics of the relationship, using forward voltage method and thermal resistance method of three kinds of power LED to carry on the actual type blu-ray measurement, and the measurement data is analyzed and discussed, calculates the three types of blue leds thermal resistance；meanwhile experimental results show that the environment temperature rising and drive current increases, will cause the LED the junction temperature elevatory; "High temperature will make blue leds of main wavelength happen redshift, main wavelength of light intensity corresponding appears different degree of attenuation.

This article firstly introduced the structure, principle for lighting and the cause of this temperature's occuring of the LED, then focus from the experiment in the context of the blue light LED with great power and spectral characteristics, the law is the voltage and thermal resistance of three blue light led power in a practical measure, to the survey data on the analysis and discussion, the calculation of the three types of blue light led thermal resistance, and the results showed that the temperature rise and the current drive to increase, will lead to the LED junction temperature rise; junction temperature will rise to the main led wavelength of blue light to red, the Optical Wavelength corresponding to the different agenda

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1N4007是普通的二极管，低频整流二极管，比较常用的二极管，价格低廉。具体参数如下：

封装形式：DO-41反向重复峰值电压：1000V正向平均电流：1.0A正向不重复浪涌电流：30A正向峰值电压：1V反向漏电流（Ta=25°C）：5uA热阻（典型，结和环境之间）：55°C/W热阻（典型，结和引线之间）：25°C/W结温：-55 °C to 125°C储存温度：-55 °C to 150°C

1N4007二极管参数

1N4007二极管曲线