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毕业设计

摘 要：随着电力电子技术的飞速发展，变压变频电源已被广泛应用在各种领

域中，与此同时，系统对变压变频电源的输出电压波形质量也提出了越来越高的要求。对逆变器输出波形质量的要求主要包括两个方面：一是稳态精度高；二是动态性能好。因此，研究开发既简单又具有优良动、静态性能的逆变器，已成为电力电子领域的研究热点。

在阐述单相全桥式变频电源原理的基础上，讨论了变频电源主电路主要器件参数的设计。为了提高输出波形质量，采用了基于脉宽调制器SG3525芯片的闭环控制电路，详细介绍了SG3525的应用特点，并分析了脉宽调制器SG3525产生脉宽调制波的形成过程，以及由SG3525控制的单相变频的实现原理。经分析结果表明，这种控制方式可实现逆变电源变压、变频，控制系统简单可靠，使用灵活，适用性强，具有良好的应用前景。

关键词：正弦波脉宽调制(SPWM)；变频电源；闭环控制；逆变

Design of the single-phase frequency- variable power supply

Abstract: With the power of the rapid development of electronic technology,

variable voltage and variable frequency power supply has been widely applied in variable fields, at the same time the quality of the output voltage waveform in the variable frequency power also made increasing demands. The inverter output waveform quality requirements include two aspects: First, steady-state high precision and the other is a good dynamic performance. Therefore, the research and development is simple and has an excellent dynamic and static performance of the inverter control strategy, which has become a power electronics research in the field of one of the hot spots.

This paper introduces the design of the main elements in the main circuit of the single-phase frequency-variable power supply, adopts the closed- loop control method which is based on pulse width modulation IC SG3525 to improve the quality of the output waveforms. This paper describes the characteristics of SG3525, analyses the formation process of making use of sine pulse width modulating signals produced by the SG3525 and the control theory of the single-phase inverter on SG3525. The experimental result shows that this control method to achieve variable voltage and variable frequency output of the power and the power supply has a good application

prospect with the advantages of reliability, feasibility and adaptability.

Keywords: sinusoidal pulse width modulation (SPWM); frequency-variable power

supplier; the closed- loop control; inverter

目 录

1绪 论........................................................................................................................... 4 1.1 课题的研究背景..................................................................................................... 4 1.1.1电力电子技术的发展........................................................................................... 4 1.1.2 变频电源的发展.................................................................................................. 5 1.1.3 变频技术的发展动向.......................................................................................... 6 1.2 课题研究的意义..................................................................................................... 7 2 系统方案论证与设计.............................................................................................. 8 2.1 系统方案论证......................................................................................................... 8 2.1.1 结构方式.............................................................................................................. 8 2.1.2 构成变频电源方式.............................................................................................. 9 2.1.3电压源型变频器和电流源型变频器................................................................. 10 2.2 系统结构组成....................................................................................................... 11 3 变频主电路的设计................................................................................................ 12 3.1 电路构成............................................................................................................... 12 3.2 变频电源的工作原理........................................................................................... 12 3.2.1 交—直部分........................................................................................................ 12 3.2.2 直—交部分........................................................................................................ 14 3.3 输出滤波电路设计............................................................................................... 16 4 功率器件的驱动和保护电路设计.......................................................................... 17 4.1 M57962L驱动电路的简介................................................................................... 17 4.1.1 引脚排列及主要性能参数................................................................................ 17 4.1.2 M57962L模块具有以下特点：..................................................................... 18