基于max1898的智能充电器设计.doc

基于MAX1898智能充电器设计
摘要
电子技术的快速发展使得各种各样的电子产品都朝着便携式和小型轻量化的方向发展，也使得更多的电气化产品采用基于电池的供电系统。目前，较多使用的电池有镍镉、镍氢、铅蓄电池和锂电池。它们的各自特点决定了它们将在相当长的时期内共存发展。由于不同类型电池的充电特性不同，通常对不同类型，甚至不同电压、容量等级的电池使用不同的充电器，但这在实际使用中有诸多不便。
本课题设计是一种基于单片机的锂离子电池充电器，在设计上，选择了简洁、高效的硬件，设计稳定可靠的软件。系统的硬件组成，包括单片机电路、充电控制电路、电压转换及继电器电路，并对本充电器的核心器件——MAX1898充电芯片、AT89C51单片机进行了较详细的介绍。系统的软件设计，以C语言为开发工具，进行了详细设计和编码。实现了系统的可靠性、稳定性、安全性和经济性。
该智能充电器具有检测锂离子电池的状态；自动切换充电模式以满足充电电池的充电需要；充电器短路保护功能；充电状态显示的功能。在生活中更好的维护了充电电池，延长了它的使用寿命。
关键词：充电器；单片机；锂电池；MAX1898
Lithium Battery Charger Design Based On MAX1898
Abstract
Electronic technology's fast development causes various electronic products develops toward portable and the small lightweight direction, It also causes more electrification products use power supply system based on battery. At present, the nickel cadmium, the nickel hydrogen, the lead accumulator and the lithium battery are widely used. Due to their respective characteristic, their application areas are not the same. Because different type of battery's charge characteristic varies, so, usually, battery which has different type, even different voltage, capacity rank, use different battery charger, but this has many inconveniences in the actual application.
This topic details a kind of lithium ion battery charger based on Single Chip, including succinctly, the highly effective hardware and reliable software. This system's hardware is made up of the monolithic integrated circuit electric circuit, the charge control electric circuit, the voltage transformation and the relay circuit, and this battery charger's core component - MAX1898 charging chip, at89C51 monolithic integrated circuit has been introduced elaborately. The system's software, taking the C language as the development kit, has been designed and encoded seriously. So this system is provided with reliability, stability, security and efficiency.
The intelligence battery charger has the ability to exam lithium ion battery's condition, to cu