51单片机+SG3525的SPWM单相电源的设计

摘要：随着电力电子技术的迅速发展,电源已广泛应用于各个领域。本文介绍了单相交流电源的工作原理,设计了一种适用于小功率单相逆变器的功率电器，主要涉及主电路设计与控制电路的设计。本电源主电路采用交—直—交结构，分析了基于不可控整流电路和单相桥式逆变电路的工作状态，并给出了参数计算。与此同时，系统对变压电源的输出电压波形质量也提出了越来越高的要求。在桥式逆变集成电路的设计上面运用了SPWM控制技术，分析了PWM控制的基本原理及SPWM波的产生方法。同时，设有过电流和过电压保护，并选用8051单片机为主控芯片，通过芯片SG3525进行了驱动电路。68633

毕业论文关键词：单相电源，桥式逆变，SPWM，SG3525

Abstract： With the rapid development of power electronics technology, power inverter has been widely applied in various fields. This paper describes the structure of power supply and its principle of working methods. This paper presents single-phase power supply which is suitable for low-power electrical equipment, including the main circuit design and control circuit design. This main circuit of power source adopts AC-DC-AC structure and analyzes the working condition based on uncontrolled inverter circuit and single-phase bridge rectifier circuit and gives parameter calculation. At the same time the quality of the output voltage waveform in the power also made increasing demands.In the design of the bridge inverter circuit, SPWM control technology is adopted, and the theory of PWM control and the method of generating SPWM wave have been analyzed. Meanwhile，the design uses 8051 as the main chip, and chooses SG3525 chip to design driver circuit. The system is also established over-current and over-voltage protection.

Key words：Single-phase source，Bridge inverter，SPWM，SG3525

1 绪论 4

1.1单相电源概述 4

1.2 课题研究意义 4

2 单相电源设计 5

2.1 单相电源结构 5

2.2单相电源工作原理 6

2.3电压源型和电流源型单相电源 10

2.4单相电源系统框图 11

3 主电路设计 12

3.1 整流电路 12

3.2 逆变电路 13

3.3输出滤波电路设计 14

4控制电路设计 15

4.1 单片机接口电路设计 15

4.2 脉冲宽度调制SG3525 16

4.3 驱动电路 M57962L 18

4.4 IGBT保护电路 19

结论 22

参考文献 23

致谢 24

1 绪论

1.1 单相电源概述

由于控制技术在各行各业的发展和对操作性能要求的提高，通用交流电网提供的交流电AC不再作为电能源直接使用在许多电气设备中，而是由此对其进行各种方式的转换，进而获得各个设备所需要的电能形式。变压就是对电能进行转换和对功率进行控制的一种基本形式，运用大功率电子器件（如功率晶体管GTR、绝缘栅双极型功率晶体管（IGBT)）将市电转换为用户所需的交流电或其他电源。论文网 51单片机+SG3525的SPWM单相电源的设计:http://www.youerw.com/zidonghua/lunwen_77235.html