改进的Boost变换器小信号模型及其应用

Improvement and Application of a Small Signal Model for Boost Converter

Boost变换器是一个非线性时变系统,用解析方法进行动态分析较为复杂。针对目前无法建立开关电源精确数学模型情况,提出利用状态空间平均法建立Boost变换器的小信号模型,目的在于改进Boost变换器的仿真模型。应用Matlab软件对其进行了仿真。同时设计了40V/120V的Boost变换器。以该变换器为对象,对电路的动态响应特性和稳定性进行了实际应用研究。仿真和实验结果证明了该模型的有效性。

Since Boost converters are pulsed nonlinear dynamic systems, it is difficult to analyze dynamic property with analytic method.Aiming at the incapacity of establishing an accurate mathematic model for the switch mode power supply, a small signal model of the Boost converter with the average state space method is set up to modify the simulation model of the Boost converter.Then the simulation results are derived from Matlab.At the same time a 40 V/120 V Boost converter is designed.The dynamic response of the circuit characteristics and stability using the real converter is analyzed.The simulative and experimental results prove the validity of model.