交叉双环LED驱动电源的研究

Study on Alternate Double Loops LED Driver

LED是一种非常敏感的半导体照明器件,故需要性能优越的驱动电源。该文针对LED的特性,提出了创新的交叉双环LED驱动电源,该设计利用双运放LM358芯片进行电流电压交叉控制以达到优秀的输出特性。文章首先分析了电路的原理,然后利用Matlab软件对控制策略的幅频特性和相频特性进行了分析,证明所提出设计的稳定性,并论述了相关优点及参数计算。电路采用BUCK拓扑结构,以及LM358芯片实现交叉双环控制,可精确控制LED驱动电源的输出电压和电流。Simulink仿真结果及实验结果验证了此电路的可行性和可靠性。

LED is a very sensitive semiconductor lighting device that needs an advantageous driver.A new alternate double loops LED driver based on LM358 （which integrates two operational amplifiers）in line with the characteristics of LED is proposed.The driver demonstrates excellent output characteristics through both current and voltage control.The principle is discussed first and a Matlab simulation is con-ducted to analyze the control scheme in its amplitude frequency and phase frequency characteristic,verif-ying the stability of the scheme.Also its advantages and parameters calculation are discussed.The pro-posed scheme adopts buck topology and achieves alternate double loops control through LM358 which can accurately control the driver＇s output voltage and current.The Simulink simulation and experiment verify the availability and reliability of the proposed scheme.