锂离子电池充电控制器_毕业论文.doc

锂离子电池充电控制器
摘要
智能电器是以微控制器/微处理器为核心,除具有传统电器的切换、控制、保护、检测、变换和调节功能外,还具有显示、外部故障和内部故障诊断与记忆、运算与处理以及与外界通信等功能的电子装置。
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
THE INTELLIGENT CONTROL THEORY AND DESIGN OF ELECTRICAL APPARATUS BASED ON MCU
ABSTRACT
Intelligent apparatus based on microcontroller and microprocessor core, not only have functions of traditional electrical switches, control, protection, detection, transformation and adjustment, but also have shown that the external and internal fault and the fault diagnosis of memory, and processing operations, as well munication with the outside world, and other functions of electronic devices.
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 alar