Boost型LED恒流驱动电路逆系统解耦控制  

Inverse-system Decoupling Control of Constant-current Boost LED Driver

作　　者：龚翌凡 陆益民[1] GONG Yifan;LU Yimin(School of Electrical Engineering,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学电气工程学院,南宁530004

出　　处：《电源学报》2022年第3期105-114,共10页Journal of Power Supply

基　　金：国家自然科学基金资助项目(51667005);广西自然科学基金重点资助项目(2018GXNSFDA281037)。

摘　　要：LED是非线性半导体器件,针对其线性模型难以建立而无法用线性系统理论设计控制器的问题,以Boost型LED恒流驱动电路为例,提出了一种逆系统解耦双电流环控制方法。在建立了系统大信号平均模型的基础上,采用双电流环控制结构,基于逆系统理论对内电流环和外电流环进行解耦,并分别将其补偿为一阶积分子系统,进而采用最优控制理论对线性子系统进行控制器设计。仿真结果表明,所提控制策略能使Boost型LED恒流驱动电路具有良好的稳态和动态性能。最后,设计了一台实验样机,从电学和光学两个角度进一步验证了所提控制策略的正确性和有效性。Since LED is a nonlinear semiconductor device,its linear model is difficult to establish and the corresponding controller cannot be designed using the linear system theory.To solve this problem,a constant-current Boost LED driver is taken as an example in this paper,and a control method of inverse-system decoupling control for double current loops is proposed.On the basis of the establishment of a large-signal averaged model of the system,a double-current loop control structure is adopted.Then,the inner and outer current loops are decoupled based on the inverse system theory,which are compensated as first-order integral subsystems,respectively.Moreover,the optimal control theory is adopted to design a controller for the linear subsystem.Simulation results show that the proposed control strategy can improve the steady-state and dynamic performances of the constant-current Boost LED driver.Finally,an experimental prototype was designed to further verify the correctness and effectiveness of the proposed control strategy from both the electrical and optical perspectives.

关 键 词：BOOST变换器 LED驱动电路 逆系统方法 解耦 

分 类 号：TM46[电气工程—电器]