一种应用于多路大功率LED的无源电流平衡电路

A Novel Passive Current Balancing Circuit for Multiple LED Strings of High Power Application

为提高系统的效率和简化系统结构,提出一种应用于多路大功率LED的无源电流平衡电路。对传统的LLC电路进行改进,通过在变压器的次级接入电容实现多路LED间的电流平衡;采用软开关技术提高系统的工作效率;采用基于uc3863的LLC闭环控制策略来实现LED的恒流;利用saber软件搭建了2路LED仿真模型,并进行结果验证。仿真结果表明:该新型拓扑和电流平衡方法是可行的,能实现软开关以及2路LED的电流平衡。

Proposes a passive current balancing circuit which is applied to multiple LED strings, aiming at improvingthe efficiency of the system and simplifying its structure. Improve the traditional LLC circuit by connecting the capacitorto the secondary of the transformer to achieve current balancing of multiple LED strings; the efficiency of the system isimproved by using the soft-switching technology; then, use the closed-loop of LLC circuit based on uc3863 to make theLED current constant; finally, the simulation model of two LED stings is built based on the saber software, and thesimulation results validate the feasibility of the new topology and current balancing method, they can realizesoft-switching and 2-ways LED current balancing.