【作者】 田欢；

【导师】 张科峰；

【作者基本信息】 华中科技大学 ， 软件工程， 2007， 硕士

【摘要】 在许多便携式的电子设备中,都是采用锂电池对电路供电。单节锂电池的标准输入电压为3.6V,而往往很多便携式电子设备要求的电压值比这个高,比如手机的彩色LCD显示、PDA和数字照相机等的光源。为了不增加电池的数量,同时满足便携式电子产品的高输入电压的要求,BOOST转换器是一个很好的选择。然而,国内对BOOST转换器系统及其稳定性的研究仅仅限于反向或者是SPEC级,很少从系统模型的角度去研究。本文的目的就是从模型的角度来研究来BOOST转换器系统及其稳定性,并对现有稳定技术进行改进,同时给出仿真验证。本文主体部分,首先介绍了建模方法及评价系统稳定的频域性能指标,然后利用建模方法给BOOST转换器的主电路建立模型,包括稳态和交流小信号。接下来对控制模式进行介绍,并对电压模式PWM控制环路给予建模,同时给出每个部分传递函数的详细推导过程。在此基础上,对采用电压模式PWM控制环路的BOOST转换器系统在频域中进行稳定性分析,并对现有稳定方法提出改进。最后,在设定好BOOST转换器系统参数的前提下,用matlab对改进方法进行仿真验证,仿真结果表明该方法对系统有很好的稳定效果。更多还原

【Abstract】 In many types of portable electronic equipment, lithium batteries are used for power supply circuits. Input voltage of single standard lithium battery is 3.6V, and portable electronic devices are often worth more than the high-voltage requirements, such as color LCD display of mobile phone, PDA, and the lights of digital cameras. In order not to increase the number of batteries, and to meet the demands of high input voltage of portable electronic products, BOOST converter is a good option.However, the research of BOOST converter system and its’system stability in our country is confined to reverse or SPEC level, rarely from the research and design of system. The purpose of this paper is to research stability for BOOST converter from the point of view of model, improve the existing methods of stability and give simulation.In this paper, firstly, the modeling method and design specifications of control loop are introduced. Secondly, the method is used to construct the model of BOOST converter, including steady-state and small signal. Next, different control mode is proposed, and the model of voltage mode PWM control loop is constructed, also makes a detailed analysis of every part’s transform function for this loop. On this basis, system stability of BOOST converter using voltage mode PWM loop is analyzed and improved method is also proposed in frequency zone. Finally, sets system parameters of BOOST converter, and simulates the proposed method. The simulation results with matlab show that this method has good stability for system loop.更多还原