基于电流反馈控制的DC/DC升压变换器

DC/DC Boost Converters Based on Current Feedback Control

目的 克服非最小相位特性对控制器设计的影响.方法 将DC/DC升压变换器的输出电压控制问题转化为对电感电流的控制,并采用了串级结构的电压和电流控制器.控制器的外环采用PI控制算法,以电容电压为被控量;内环则采用非线性输出反馈控制算法,以电感电流为被控量.结果 DC/DC升压变换器的仿真结果表明,上述控制方案是可行的.结论 该种结构的控制器不但可使被控系统获得良好的动态特性,而且对负载电阻、电容、输入电压等参数变化有着很强的稳健性.

Aim\ To overcome the difficulties resulted from the nonminimum phase property of DC/DC boost converters. Methods\ The control problem of the output voltage is transformed in to that of inductor current , and a cascade controller is adopted. The outer loop of the cascade controller adopts conventional PI control algorithm and takes the capacitor voltage as the controlled variable; the inner one adopts nonlinear output feedback control algorithm and takes the inductor current as the controlled variable. Results\ Simulated results of a certain DC/DC boost converter indicate that the controller presented above is feasible. Conclusion\ This kind of controller not only can make the controlled system achieve excellent dynamic characteristics, but also have strong robustness to the variations of system parameters, such as load resistance, capacitance, and input voltage.