基于峰值电流控制的Buck-Boost型LED驱动器设计

The design of LED driver based on Buck-Boost circuit with peak current controlling reactive circuit

LED以其发光效率高和寿命长两大优势在现代照明领域中得到很快的发展,各种类型的驱动电路也应运而生,文章设计的LED驱动的主电路是Buck-Boost型的DC/DC变换电路,应用PID算法的峰值电流控制PWM电路进行了反馈控制.仿真结果表明,该型LED驱动器有较好的稳定性,对负载扰动和输入电压扰动的抑制能力较强.

For its two major advantages of the high luminous efficiency and long using-life, LED is developing quickly in the modern lighting field, and various types of its driving circuits have emerged. In this paper, we introduce one type of LED driver of which the major circuit is Buck-Boost DC/DC converting circuit and the re- active circuit that PWM is controlled by the peak current which is based on PID algorithm. From the simulating results, we can see that this type of LED driver has good stability, and the ability to resist against load disturbance and inputting voltage disturbance is better than the traditional drivers.