基于USB主机的智能调节器的设计和开发-控制理论与控制工程专业论文.docxVIP

青岛科技大学研究生学位论文 摘要 从软件和硬件角度详细介绍了智能调节器的设计原理和方法。调节器具有 4路输入通道和4路输出通道，其中第一输入通道和第二输入通道可进行温度 测量，实现了各种型号热电偶和热电阻的自动切换，热电阻采用四线制接法， 完全消除了导线电阻的影响。第三输入通道和第四输入通道既可以接受4～ 20mh电流信号和l～5V的电压信号。4输入和4输出既可以实现单回路控制又 可以相互组合实现串级控制。 能够对输入和输出通道进行故障诊断和故障定位，具有自动校准功能，较 好克服了器件参数变化和温度漂移引起的误差。 运用Buck和Buck—Boost电路实现DC／DC变换，详细介绍了它们的基本原 理、器件参数的选取，建立了他们的交流小信号模型。详细讨论了闭环的形成 和补偿网络的设计方法。 具有USB主机功能，实现了调节器对大容量设备类的读写操作。并根据FAT 格式，初步建立了FAT系统。同时还具有RS485通讯接口。 充分利用彩色液晶丰富的显示技术，采用键盘和菜单相结合的方式设计人 机界面，能够实时显示各通道的曲线。具有实时时钟，并可以实现时钟的设定 和修改。 采用自整定技术，对PID参数进行自整定。 关键词 智能调节器DC／DC变换USB主机PID  基丁USB主机的智能调节器的设计和开发 ABSTRACT In this paper，the design method and process of intelligent contr01ler is narrated from the view of hardware and software．The intel 1 igent control 1er has four input channels and four output channels． The first input channel and the second input channel can be used to measure the temperature signal．In this two channels the type of input signal can be switched between the different thermocouple and thermal resistance．When the input is thermal resistance．thermal resistance is connected using 4一Wire configuration．Thi s can elimimate the effect of 1ead wire resistance on the measured resul t and improve the measure precision．The third input and the fourth input not only can reeeive the four to twenty milliampere current signal but also the one to five voltage signal．The input and the output can be used to the single loop control and al so be used to cascade contr01． The controller can diagnose oil the input and the output and go the ehannel with failure．It also has sel f—correction function．which can el iminate error by cause of the change of device and the temperature drift． DC／DC is implemented by using the Buck eircuit and the Buck—Boost cireuit．The principle and parameter selection of the Buck and Buck—Boost circuit is introduced in detail．The AC small sjgnal model of the Buck and Buck—Boost circuit is established．The closing of loop and the design of compensate net is also discussed． The controller has USB hos