【作者】 刘和茂；

【导师】 王毅；

【作者基本信息】 北京交通大学 ， 电力电子与电力传动， 2008， 硕士

【摘要】 随着电动振动试验系统的发展,亟需高性能、高效率、大功率的功率放大器与之配套。开关功率放大器效率高、通频带宽、体积小,正逐步取代效率低下、体积庞大的线性功率放大器,是目前研究的热点。随着DSP技术的发展,TMS320C24x系列DSP(数字信号处理器)外设丰富,芯片编程灵活,具有数字控制固有的优点。以其为核心的控制系统成本低、性能可靠,在开关功放的控制中广泛应用。目前,如何实现开关功率放大器的数字化控制,是研究的重点。本文综述了目前电动振动试验系统中开关功放的发展现状,总结和比较了开关功放的控制策略,研究了影响其性能的主要参数。根据电动振动试验系统对开关功放的要求,提出了以电感电流瞬时值控制技术为基础的三电平脉宽调制开关功放的设计方案,并通过系统仿真进行了原理性论证;然后设计并制作了开关功放的硬件,包括功率转换电路,基于DSP的控制电路,驱动、隔离电路以及保护电路;针对开关功放数学模型不易得出的特点,细致分析了模糊自适应PID控制方法,在此基础上编写了控制程序;研制出一台功率为2kVA,通频带为10～3kHz的三电平脉宽调制开关功放;论文中还探讨了实现大功率开关功放的方法,分析了各种方法的可行性,给出了实现大功率开关功放的思路,并进行了并联开关管实现大功率开关功放的实验。最后,对设计的开关功放进行了一系列实验,给出了实验波形。更多还原

【Abstract】 With the development of the electric vibration test system, the requirement of the power amplifier with high performance and high efficiency is urgent. is popularly used because of its virtues of its high efficiency, small volume and high frequency bandwidth. The switching power amplifier is gradually replacing the linear amplifier and has become a hotspot of research now.With the development of the digital dignal processing technology, TMS320C24x series of DSPs (Digital Signal Processor) perform fast and accurate calculations, flexible program capability, and abundant peripheral functions. The high performance of DSPs allows real-time execution of complex control algorithms and single-chip solution for switching power amplifier control system. Benefiting from high performance and low system loss, applications of the TMS320C24x in the control system of switching power amplifiers extensively.How to digitize the control system of switching power amplifier is the focus point in the study.Firstly, the thesis researches the principle, control strategy and classification of the switching power amplifier, and analyses some main parameters. Later, it makes some comparison with four kinds of modulation technique, and finally, it implements the three-level PWM switching power amplifier with the PWM technique. The power of the amplifier is 2kVA, and the frequency bandwidth is 10～3kHz.In the thesis, the author designs and makes the hardwares of the switching power amplifier. The hardwares contain power inverter rank circuit, control system circuit based on DSP, drive and isolation circuit, and protective circuit. The thesis also analyses the potential safety problems and put forward some solutions for the problems. Furthermore, the thesis accomplishes the software design of the control system, and successfully debugs it. The methods of designing higher power ampilfier are also discussed in the thesis. It analyses the feasibility of the methods, outlines the way of how to design higher power switching power amplifier, and does some experiments with the method of switches-parallelling.At last, the hardware and the control strategy are tested by emulation and experiments. A series of waveforms of the whole system are given.更多还原