电气工程及其自动化专业精品毕业论文--锂离子充电控制器设计.doc

摘要
本文根据近年来便携式电子产品的迅速增长,对电源管理的要求越来越高,设计了一款用于电源管理的智能电器。
首先对广泛采用的电源锂电池的化学原理进行了介绍,通过实验得出在不同影响因素下充放电时锂离子电池电压与容量的关系,另外还就充放电电流,过充,过放,及过温对锂电池的影响进行了讨论。
在对锂离子电池特性实验分析的基础上,进行了智能电器电路设计和软件程序编写。设计的电源管理部分具备了充电过程的控制,结合Atmel公司的AT89C52单片机管理功能,包括:温度控制、时间控制、电源关断、蜂鸣报警和液晶显示等,可以完成一个较为实用的电源管理系统。为了保护数据,抑制干扰,进行了看门狗监测电路功能设计,保证了智能电器工作的可靠性。
最后对智能电器进行了测试实验。结果表明智能电器能够实现设计的全部功能。能够提供预期范围的预充电流和终止充电电流,恒流充电时的电流值在设计范围内,恒压充电时,能够提供较理想的电池端压。同时,也实现了相应的过温保护功能,及其出错报警等功能。
关键词:智能电器,电源管理,锂电池,AT89C52
Abstract
Based on the rapid growth of the portable electronics in recent years, power management have e increasingly demanding, the article designs a intelligent power management for electrical apparatus.
First of all, the article introduces the chemical principle of lithium batteries, and then carries out the experiments of the battery charge and discharge in different factors, finding out the relationship between the battery voltage and capacity. In addition, discussing the charge and discharge current, charge-off, take-off, and over-temperature to the impact of lithium batteries.
On the basis of analysis of the lithium-ion battery characteristics experiments, carry out a intelligent electrical circuit design and software programs. Design of power management has some control over the charging process, combined with Atmel's AT89C52 single-chip management capabilities, including temperature control, time control, power off, beep alarm and liquid crystal display, and so on, can be a more practical power management system. In order to protect the data, interference suppression, the watchdog function of monitoring circuit design ensures that the work of the intelligent apparatus.
Finally, intelligent apparatus testing results show that the intelligent apparatus designed achieves full functionality. It can be expected to provide the scope of the pre-charge current and terminating charge current; the current value is in the design when charging current and it can provide a better battery-side pressure when char