电气工程及其自动化专业毕业设计

PWM 直流脉宽调速系统的设计摘 要以电力电子学和电机调速技术为基础，本文设计了一种基于直流脉宽调速控制技术的直流电机调速系统。为了得到较好的动静态性能，该控制系统采纳了双闭环控制，同时速度调节器和电流调节器都选用PI调节器。本调速系统采纳半桥型电路作为主电路,它相当于降压斩波电路和升压斩波电路的串联组合,选用全控型器件 IGBT 作开关器件。控制电路以集成 PWM 控制器 SG3525 为核心,3525 输出的脉宽调制信号经 LM1413 放大后作为 IGBT 的驱动信号。实验证明本调试系统直流电压大小调节和电机可逆运行的实现非常方便，并具有较硬的静特性和机械特性。 关键词: 升/降压斩波电路；SG3525；直流脉宽调速；MATLABAbstractOn the basis of Power Electronic and electric motor speed adjusting technology, the calibrator designs a speed adjusting system in which Pulse Width Modulation (PWM) controlling technology is used to control . motor. Dual closed loop controlling technic is alse adopted so that the sysetem has satisfactory steady-state and dynamic characters. The system uses single chip micro computer as an auxiliary unit.Insulated Gate Bipolar Transistor (IGBT) is selected as power semiconductor on-off element in the system The thesis explains the principle of PWM controlling. The special integrated PWM controller-SG3525 which can help us realize PWM control easily is elaborated , this chip's internal structure and its peripheral circuit are analyzed, and its applying example in this system is given.Key words: Boost/Buck chopper；SG3525；DC Pulse Width speed control；MATLAB目录No table of contents entries found.第1章 引言在现代科学技术革命过程中，电气自动化在 20 世纪的后四十年曾进行了两次重大的技术更新。一次是元器件的更新，即以大功率半导体器件晶闸管取代传统的变流机组，以线形组件运算放大器取代电磁放大器件。后一次技术更新主要是把现代控制理论和计算机技术用于电气工程，控制器由模拟式进入了数字式。在前一次技术更新中，电气系统的动态设计仍采纳经典控制理论的方法。而...