交流LED与高压LED的特性实验研究

Research on Characteristics of High-voltage LED and AC LED

高压LED和交流LED都是通过串联数十颗LED来增大整体导通电压,结构上高压LED是交流LED的一种特殊形式。介绍了高压LED和交流LED的驱动电路模型,其共同点是皆有一个限流电阻与光源串联。通过调整限流电阻的阻值和改变光源所含LED个数与连接形式,分别对高压LED和交流LED的输出特性进行了测量。在两种光源所含LED数量和工作电流均相同的情况下,高压LED的发光效率和光通量要高于交流LED;并联式高压LED的发光效率低于串联式高压LED的发光效率,光通量则相反;验证了交流LED的发光效率与限流电阻无关。

Both high voltage LED and AC LED increase their break-over voltage by connecting dozens of LED in series,and high-voltage LED can be considered as a special form of AC LED in structure.Driving circuit models of high-voltage LED and AC LED were introduced,and their similarity is that they both own a current-limiting resistance connected in series with the light source.The output characteristics of high-voltage LED and AC LED were measured by adjusting current-limiting resistor,the number and connecting form of LEDs.It is indicated that with the same LED number and operating current,both the luminous efficiency and luminous flux of high-voltage LED are all higher than that of AC LED,but the luminous efficiency of parallel high-voltage LED is lower than that of the series one,while the luminous efficiency is on the contrary.According to the measurement,it is verified that the luminous efficiency of AC LED is irrelevant for the current-limiting resistance.