高压LED球泡灯的设计与分段优化

A HV-LED Bulb with Optimization of LED String Segment

近年来在解决以开关电源为基础的传统LED驱动效率低、体积大和成本高等问题的过程中,高压线性分段驱动技术应运而生。为了研究高压线性分段驱动LED球泡灯的设计方法,以高压线性分段驱动芯片SM2087为例,通过实测LED效率得到合适的分段比例为8∶4∶3∶1;并根据该分段比例设计了一种高压LED球泡灯,LED采用COB的方式布置在陶瓷环基板上,散热采用太阳花结构,驱动电路置于灯头内,其具有较高的效率、良好的散热与耐高压能力以及较大的发光角度。

In recent years, muti-stage high-voltage linear LED driver came into being when solving the low effciency, great volume and high cost problems of LED driver based on the switching power supply. In order to get the design method of LED bulb with muti-stage high-voltage linear LED driver, muti-stage high-voltage linear LED driver SM2087 was taken as a example, and the appropriate segment ratio was got as 8：4：3：1 by measuring the LED effciency. Then, a HV-LED bulb was designer, the details is as follows： LEDs were placed on the ceramic ring by COB technology, the heat sink used sunfowers structure, the drive circuit was placed inside the lamp. The bulb has advantages of high effciency, good heat dissipation, high pressure capacity and larger light emission angle.