【摘要】：DC-DC變換器廣泛應用到通信、計算機、家用電子產品和航天等領域中,隨著科技的發(fā)展,一些電子器件對電源的要求越來越高,如家用電子產品中需要用到電壓穩(wěn)定、內阻極小、動態(tài)性能優(yōu)良的便攜式電源。所以,研究高性能的DC-DC變換器已經成為現代電源研究中的主要方向。本文在分析了DC-DC變換器的幾種常用數學模型的基礎上,將滑模變結構控制理論應用于DC-DC變換器設計中,設計了一臺基于DSP的滑�？刂艱C-DC變換器,主要工作如下： 首先,介紹了DC-DC變換器常用的線性控制策略和非線性控制策略的優(yōu)點和不足,以及DC-DC變換器的模擬和數字控制技術。以DC-DC變換器中的Buck變換器、Boost變換器、Buck-Boost變換器為例,分析了它們拓撲結構的特點和幾種常用建模方法,以及使用這些方法在設計DC-DC變換器時的一些局限。 其次,分析了滑�？刂评碚�,將滑模控制理論應用于Buck變換器,設計了一種使用固定頻率PWM波的滑�？刂品椒�,該方法不僅降低了功率開關的頻率,而且解決了開關的轉換速度對滑�？刂破餍阅艿挠绊憽Ｕ麄�系統包括主功率回路、電感電流檢測電路、電容電流檢測電路、DSP控制電路。 最后,完成整個系統的測試。實驗結果表明,本文使用的基于PWM技術的變結構滑�？刂品椒�,很好的解決了開關切換速度對滑模變結構控制的影響。在系統內部參數變化時具有很好的魯棒性,且控制精度高,動態(tài)響應速度快。
[Abstract]:DC-DC converters are widely used in the fields of communication, computer, household electronics and spaceflight. With the development of science and technology, some electronic devices require more and more high power supply, such as voltage stability in household electronic products. Portable power supply with minimal internal resistance and excellent dynamic performance. Therefore, the research of high performance DC-DC converter has become the main research direction of modern power supply. Based on the analysis of several common mathematical models of DC-DC converter, the sliding mode variable structure control theory is applied to the design of DC-DC converter. A sliding mode control DC-DC converter based on DSP is designed. The main work is as follows: firstly, the advantages and disadvantages of linear and nonlinear control strategies used in DC-DC converters are introduced, as well as the analog and digital control techniques of DC-DC converters. Taking Buck converter, Boost converter and Buck-Boost converter in DC-DC converter as examples, the characteristics of their topological structure and several common modeling methods are analyzed, and some limitations of using these methods in designing DC-DC converter are analyzed. Secondly, the sliding mode control theory is analyzed, and the sliding mode control theory is applied to Buck converter. A sliding mode control method using fixed frequency PWM wave is designed, which not only reduces the frequency of power switch, but also reduces the frequency of power switch. Moreover, the effect of switching speed on the performance of sliding mode controller is solved. The whole system includes main power circuit, inductance current detection circuit, capacitive current detection circuit and DSP control circuit. Finally, the test of the whole system is completed. The experimental results show that the variable structure sliding mode control method based on PWM technology can solve the effect of switching speed on sliding mode variable structure control. It has good robustness, high control precision and fast dynamic response speed when the system parameters change.
【學位授予單位】：華中師范大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM46

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本文編號：2385996