智能充电器毕业设计

智能恒压充电器设计

内容摘要：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，详细说明了系统的硬件组成，包括单片机电路、充电控制电路、电压转换及光耦隔离电路，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。阐述了系统的软硬件设计。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。

关键字：智能恒压充电器锂电池MAX1898

Design of intelligent constant voltage charger

Abstract:the rapid development of electronic technology makes a wide variety of electronic products towards portable and compact lightweight direction, more electrical products based on battery power supply system. At present, the use of more batteries nickel-cadmium, nickel-metal hydride, lead battery and lithium battery. Their respective characteristic decided they would in a fairly long period of coexistence. Due to the different characteristics of different types of charge of the battery, usually of different types, and even different voltage, high-capacity battery using different charger, but it has a lot of inconvenience in practical use. The design is based on a single-chip Li-ion battery charger, in the design, selection, a simple and efficient hardware design, stable and reliable software, a detailed description of the hardware structure of the system, including single chip circuit, a charging control circuit, voltage conversion and optically coupled isolation circuit, and the charger core devices - MAX1898 charging chip, AT89C51 chip are introduced in detail. Elaborated the system hardware and software design. Using the development tool of C language, a detailed design and coding. Realization of the system reliability, stability, security and economy. The intelligent charger with detecting lithium ion battery condition; automatic switching charging mode to meet the need of the charger rechargeable battery charging; short circuit protection; the charging state display function. In life the better maintenance of rechargeable batteries, prolongs its service life.

Keywords: intelligent constant voltage charger lithium battery MAX1898

目录

前言 (1)

1 实例说明 (1)

2 设计思路分析 (1)

2.1要实现智能化充电器，需要从下面两个方面着手。 (1)

2.2 为何需要实现充电器的智能化 (2)

2.3 选择电池充电芯片 (2)

2.4 MAX1898的充电工作原理 (3)

3 智能恒压充电器硬件电路设计 (5)

3.1 电路所需器件功能介绍 (5)

3.1.1 AT89S51引脚功能 (5)

3.1.2 MAX1989引脚功能 (8)

3.2 时钟电路设计 (10)

3.3 电路原理图及说明 (11)

3.4 软件设计 (14)

3.5 程序流程 (15)

4 总结语 (15)

附录1：单片机采样部分电路原理图 (17)

附录2：PCB控制模块 (18)

附录3：程序 (19)

参考文献 (22)