基于虚拟仪器的电热水器温度控制系统___调压方案.doc

毕业设计论文 基于虚拟仪器的电热水器温度控制系统——调压方案 摘 要 关键词：；； Virtual Device-Based Electric Water Heater Temperature Control System-Pressure Adjustment Plan Abstract Electric water heater is a water heater using electricity to heat water. Currently, with improving life of people, people’s environmental protection and safety consciousness increasing and developing of the electric power industry of China, electric water heater is becoming more and more popular among consumers and its use is popularizing increasingly. Currently, its main development direction is safety, energy efficiency, multi-purpose and intelligence. The thesis designs a PID algorithmic-based temperature control system for electric water heater by using LabVIEW8.2. the temperature signal that is collected by a thermal resistance Pt100 is converted into the 0-10V voltage signal which is acceptable for a board through conditioning circuit, which is inputted into a computer by using simulative input port AI0 of the board PCI-6221. The LabVIEW program operating on the computer generates one pulse to be outputted to the digital output port P0.0 of PCI-6221 by analyzing and processing the inputted data to control the connection with controllable silicon chip and to further control the heating process of electric water heater. Key words: Electric Water Heater；Temperature Control ；LabVIEW；Data Acquisition 目 录 摘 要 I Abstract II 第一章 引言 1 1.1 电热水器简介 1 1.2 电热水器的分类 1 第二章 电热水器温度控制方案选择与设计 3 2.1 基于单片机的电热水器温度控制系统 3 2.2 基于虚拟仪器的电热水器温度控制系统 4 第三章 虚拟仪器介绍 6 3.1虚拟仪器的概念 6 3.2虚拟仪器的结构及组成 7 3.2.1 虚拟仪器的硬件组成 8 3.2.2 虚拟仪器的软件组成 11 3.3虚拟仪器总线技术 13 3.3.1 DAQ总线方式的虚拟仪器 13 3.3.2 GPIB总线方式的虚拟仪器 15 3.3.3 VXI总线方式的虚拟仪器 16 3.3.4 PXI总线方式的虚拟仪器 16 3.3.5 LXI总线方式的虚拟仪器 16 3.4虚拟仪器的优点 17 3.5虚拟仪器与传统仪器的比较 18 3.6虚拟仪器的发展趋势 20 3.6.1 网络化 20 3.6.2 向几何参量和机械参量等难点领域拓展 20 3.6.3 基于Linux操作系统的虚拟仪器 21 第四章 基于虚拟仪器的电热水器温度控制系统的设计 22 4.1系统硬件设计 22 4.1.1温度测量及调理电路 22 4.1.2 温度控制电路 24 4.1.3过零检测电路 27 4.1.4 数据采集卡 28 4.2系统软件设计 29 4.2.1 PID算法及实现 30 4.2.2 软件设计 33 4.2.3 软件调试 36 第五章 实验与调试 38 第