单相PWM逆变电源的设计.doc

摘 要 随着国民经济的高速发展和国内外能源供应的紧张，电能的开发和利用显得更为重要。目前，国内外都在大力开发新能源，如太阳能发电、风力发电、潮汐发电等。一般情况下，这些新型发电装置输出不稳定的直流电，不能直接提供给需要交流电的用户使用。为此，需要将直流电变换成交流电，这就需要逆变技术的大力应用。 本文设计的单相PWM逆变电源属于交流电源，采用电压反馈控制，通过中断功率通量和调节占空比的方法来改变驱动电压脉冲宽度来调整和稳定输出电压。其主电路构成采用的是Boost电路和全桥电路的组合。本设计的核心是AVR单片机，既能产生PWM波，控制升压电路和逆变电路，又能对系统进行实时监控，确保系统的稳定性。 本文详细的分析了该逆变电源的工作过程，并推导了重要公式。最后对该逆变电源进行了软件仿真，验证了其可行性和有效性。 关键词：逆变器，脉冲宽度调制Abstract With the high-speed developing of national economy and the shortage supply of world electrical energy supplies, the development and utilization of electric power is more important. Now, there are a lot people try their best to develop the new energy, such as solar power, wind power and tidal power and so on. In general, these new power generation unit output is not stable of DC, and cant directly provide users alternating current. So, we need to transform DC to AC, this needs the application of the inverter technology. In this paper, the design single-phase PWM inverter power supply belong to the AC power, it adopt the voltage feedback control, It can adjust and stable output voltage through the interrupt power of empty and adjustment of the flux to transform the driving voltage pulse width. Its main circuits are the Boost circuit and the whole bridge circuit. The core of the design is the single chip microcomputer AVR, it can not only produce PWM waves which can control boost circuit and source inverter, but also real-timing monitor the system, to ensure the stability of the system. This paper makes a detailed analysis of the working process of the inverter power supply, and derived the important formulas. Finally the inverter power for the software simulation proves its feasibility and validity. Keywords：Inverter, PWM, MOSFET 目 录 摘 要 I ABSTRACT II 1 绪言 1.1 课题背景 1 1.2 课题研究的目的和意义 1 1.3 国内外概况 2 1.4 课题主要的研究工作 4 2 系统设计方案的研究 2.1 系统的控制特点与性能特点 5 2.2 系统实现的基本原理 5 2.3系统实现方案分析比较 8 3单相PWM逆变电源的设计 3.1系统组成 13 3.2主电路设计 13 3.3控制电路工作设计 18 4 系统软件设计 4.1系统软件设计目的 27 4.2系统软件设计思路 27 4.3系统软件仿真 28 5 总结与展望 29 致