AT89C51单片机蓄电池性能检测装置的设计
毕业论文关键词： 蓄电池；容量检测；恒流放电
The design of the battery performance detection device
Abstract：The design is a battery performance detection device which is based on AT89C51 micro controller can achieve the following requirements: 1.battery capacity measurement by battery discharge; 2.measuring dynamic value of voltage; 3.can switch display the battery capacity / voltage; 4.alarm after the end of a measure. In order to detect the battery voltage, the voltage of the battery sample (small current discharge), makes the measured voltage value more accurate.In order to detect the capacity of the battery, also need to battery current sampling (high constant current discharge, the discharge current is 3A - 4.5A).Constant exile electric circuit integrated operational amplifier, its structure is simple, easy to adjust, ensures a constant discharge current, to ensure that can accurately detect capacity.Real time measure the voltage and displayed on the screen, discharge to the discharge end of 10.5V.Do not need artificial calculation, display real-time display the current capacity of the energy that is released, and calculate the capacity.This design USES AT89C51, the hardware structure of the whole system is simple, its main function is implemented by software programming, so small size, high reliability and convenient measurement, display visual, cheap.
Keywords： Accumulator；Capacity check；Constant-current discharge
目录
1 绪论1-3
1.1课题的目的和意义1
1.2国内外研究现状与水平1-3
1.3发展趋势3
1.4本设计需要完成的工作3
2蓄电池容量检测装置的原理4-8
2.1容量检测装置原理简述4-7
2.1.1 检测容量的方法4-6
2.1.2 试验条件和要求6
2.1.3 恒流放电电路的介绍6-7
2.2 水温检测模块原理简述7
2.2.1蓄电池容量和环境温度之间的关系7
2.2.2 水温控制PID算法介绍7-8
3硬件设计9-22
3.1 AT89C51介绍9-11
3.1.1 AT89C51主要特性9-10
3.1.2 时钟振荡电路以及复位电路10-11
3.2 温度检测硬件设计11-12
3.3 温度控制部分硬件设计12-14
3.4电源稳压电路的设计14-15
3.5恒流放电电路的设计15-16
3.6 屏幕显示以及键盘的设计16-18
3.7 报警模块以及通信模块的设计19-20
3.7.1报警模块的设计19
3.7.2 通信模块的设计19-20
3.8 A/D和D/A转换的设计20-22
4 软件的设计23-35
4.1主要度量转换23-27
4.2 主程序流程图27-28
4.3 A/D转换程序的设计29
4.4键盘扫描程序29-33
4.5数字显示程序的设计33-34
4.6 温度控制程序设计34-35
结论36
致谢37
参考文献38
1 绪论
1.1 课题的目的和意义
铅酸蓄电池经过长期的发展与完善已经成为了世界上广泛使用的一种化学电源，由于铅酸蓄电池有很多优点，比如说文护简单、价格便宜、供电可靠、适用范围广、电压特性平稳，所以被广泛地运用到汽车、飞机、轮船等设备中。随着经济的发展，蓄电池的应用越来越频繁。