DC-DC变换器数字控制离散建模研究

DC DC变换器的数字控制相对于传统的模拟控制有很多优点。求解变换器的离散数学模型是设计其数字控制系统的基础。以boost变换器为例,应用线性平均法、准线性法和精确离散法分别求解DC DC变换器的平均离散模型、准线性离散模型和精确离散模型;仿真分析三种离散模型在各种扰动下的响应。结果表明准线性模型能精确地描述系统在各种扰动情况下的响应,且可以方便地应用于变换器的数字控制的设计,以实现控制的自适应。

Analysis of three discrete models for digital control of DC-DC converter

Compared with traditional simulated control, the digital control of DC-DC coverter has many advantages. And the discrete math model is its basis. With linear average method, quasi-linear method and accurate discrete method,the paper takes the boost converter as an example to calculate the average linear discrete model, quasi-linear discrete model and the accurate discrete model. Compared with the responses of each model in disturbance and analyzed their characteristics and application fields, the result shows that the quasi-linear discrete mode is accurate and suitable for the design of digital controller.