单片机电动汽车绝缘监测系统的研究与设计
关键词 电动汽车 高压 绝缘电阻 监测
毕业论文设计说明书外文摘要
Title Research and design of the insulation monitoring ofelectric vehicles.
Abstract
In recent years, faced with the increasingly serious energy crisis, the electric vehicle has been developed rapidly.While the voltage of internal high voltage system of electric vehicle was as high as 300V, so，considering the personal safety of the driver and conductor，the insulation monitoring of electric vehicles is particularly important.After researching on the insulation monitoring system of pure electric vehicles,this paper sets up a simple model which is based on the configuration of high voltage system.The circuit is built according to the principle of unbalanced bridge and the software part uses C programming language to complete the program.The SCM can realize the combination of software and hardware，simulate measurement and calculation,and realize the monitoring of insulation resistance.The test results show that, the device can obtain accurate insulation resistance, and can timely alarm.
Keywords Electric vehicle High pressure Insulation resistance Monitor
目 录
1 绪论 1
1.1 课题研究的背景及意义 1
1.2 绝缘监测的发展现状 1
1.3 本论文主要内容 3
2 绝缘监测系统的测试原理 4
2.1 电动汽车的结构组成 4
2.2 绝缘监测系统的原理 4
2.2.1 绝缘电阻的安全阈值 4
2.2.2 绝缘电阻监测的原理 4
2.3 绝缘监测系统的总体设计 6
3 绝缘监测系统的硬件电路设计 8
3.1 系统的中央控制器 8
3.2 A/D转化芯片 9
3.2.1 A/D转化芯片引脚图 9
3.2.1 A/D转化芯片的工作原理 10
3.3 硬件电路的设计 11
3.3.1 外围电路 11
3.3.2 A/D转化模块 11
3.3.3 数码显示模块 12
3.3.4 LED灯模块 12
4.1 软件系统的开发环境 14
4.2 软件系统的总体设计思路 14
4.3 软件系统的流程图 15
4.3.1 主程序模块 15
4.3.2 A/D采样程序 16
4.3.3 LED灯报警程序 19
5 绝缘监测系统的调试 21
5.1 绝缘监测系统的实物装置 21
5.2 绝缘监测系统的测试 21