中文摘要：

针对一类Buck-Boost变换器,提出一种线性与非线性复合控制算法。在负载电流发生大的阶跃变化时,使用非线性电容电荷平衡控制算法,保证动态过程中输出电容上的放电量和充电量相等,并使动态过程中电容充放电量最少,在相应的时间点来控制开关管的动作,使Buck-Boost变换器快速恢复到稳态,从而优化动态性能的目的;在变换器处于稳定工作状态时,采用常规的线性电压模式控制。本文给出了非线性电容电荷平衡控制算法的详细计算公式,并利用FPGA数字控制平台实现所提的控制算法。最后的仿真实验和样机实验,验证了所提的线性与非线性复合控制算法能够提高Buck-Boost变换器的动态性能。

英文摘要：

A linear/non-linear control algorithm was applied to the Buck-Boost converter. Once the load current has a large step change,the balance between the charge and the discharge of the output capacitor is controlled by the non-linear capacitor charge balance control（ CBC） algorithm. The switching time was calculated with the proposed algorithm,and the Buck-Boost converter has a fast recovery transient. In the steady-state,the converter was taken by the traditional voltage control mode. Moreover,the analysis and the calculation of the proposed algorithm were carried out in detail,and the algorithm was tested by the FPGA digital controller. Finally,ompared with the traditional voltage mode control,the simulation results and the experimental results of the prototype show that,the proposed algorithm can significantly improve the dynamic performance of the Buck-Boost converter.