双电源自动转换开关的设计.doc

双电源自动转换开关的设计 PAGE PAGE 28 双电源自动转换开关的设计 胡剑挺 (自动化与电气工程学院 指导教师：项新建) 摘要：随着经济的不断发展，电力质量日益受到人们的重视,供电的连续性是电力质量的重要内容。一些关键的场所如医院、炼钢厂、消防设施，都需要两路电源供电，来保持供电的连续性。针对不间断供电的需求，基于采样、比较的工作原理。对两路三相供电电压的采样，人机接口设计和电源的切换部分等硬件组成进行了详细的设计。采用结构化、模块化编程方法，用Keil C编程了采样、人机接口、自动转换等软件，实现了对电源状况的判断和双电源的自动切换。当工作电源发生过压、欠压和缺相等故障时，双电源自动转换开关完成主、备电源间转换，以保持供电的连续性。该系统具有可编程、自动化测量、LCD显示、数字通讯等功能，集数字化、智能化、网络化于一身，是双电源转换的理想产品。 关键词：双电；自动转换；智能控制 Abstract：With the development of economics, the mount of power used by enterprises has exceeded greatly the mount power system can supply. It resulted in frequently power cut and the demand for power quality and safety is more and more high. There are so many important grounds such as hospitals, steel-makers, fire-controller facilities which require two power sources to realize durative of power supply. To meet the demand for uninterrupted power supply，the developing scheme of intelligent automatic switching-over double power supply system controller using P87C591 controller as main control chip was introduced . The system includes the voltage sampling, the power sources control, the man-machine interface. It is implemented with the structure and the modular programming method, programmed with Keil C. In power service equipment，based on the working principle of sampling, comparing, running software on the P87C591 controller, the micro-controller detect the power supply state and process corresponding control. If faults such as overvoltage,undevoltage，phase loss etc, was found in the normal power, the standby power would switch by the automatic transfer switch controller. The switching between two-way powers was reliably finished automatically to ensure the continuity of power supply.It is one kind double power source module which have programmable function, the automation measures, LCD display, the numerical communication .It integrates digitization , intellectualized, network-rization , which leads to automatic measurement and control process ,and reduces an