锂电池充电器电路设计

湖南文理学院课程设计报告

课程名称：《电子设计制作与工艺实习》课题名称：锂电池充电器电路设计

系部：电气与信息工程学院

专业班级：自动化10 级1班

学生姓名：**

指导教师：***

完成时间：2012年6月11日

报告成绩：

锂电池充电器是专用的锂电池充电工具，由于锂电池大量使用，且锂电池的价格比较昂贵，大众对充电器的讲究越来越重视；于是设计了一个稳定可靠充电模式的充电器。它由变压器、全桥整流管、三端稳压器和电容构成了电源单元；二极管和电阻构成电池采样单元；由两个不同的三极管构成恒流恒压转换单元；由运放器、电阻、稳压二极管构成电池充电电路的逻辑处理单元；由DW01芯片、二极管和两个CMOS管构成保护电路。电源部分、电池采样单元、逻辑处理单元、恒流恒压转换单元以及锂电池充电器保护电路组成了安全的，且具有恒流和恒压充电模式的充电器。经过电路单元分析计算设计出锂电池充电器的恒流恒压转换的临界电压值；通过multisim仿真结果显示与分析计算达到了一致。锂电池充电电路在原来单纯的恒流充模式的基础上增加了一个恒压充模式；然后经过计算分析，设置出锂电池的恒流恒压转换的临界电压值；与此同时增加了一个充电器保护单元，有效的起到了过充保护作用。但在整个电池充电器电路中的一些不足还有待解决。

关键词：锂电池；整流；电压采样；恒流恒压模式；保护电路

Lithium battery charger is special lithium battery tool, due to the use of lithium batteries, and the price of lithium battery relatively expensive, the exquisite pay more and more attention to the charger; Then design a stable and reliable charging mode charger. It consists of transformer, the whole bridge, the voltage stabilizer and emission three capacitance constitute the power supply unit; Diode and resistance constitutes battery sampling unit; By two different transistor constitute a constant voltage conversion unit; The op-amp device, resistance, constitute the battery voltage circuit of the diode logical processing unit; By DW01 chip, diodes and two CMOS tube constitute the protection circuit. The power of the battery unit, logic, sampling the processing unit, constant voltage conversion unit and lithium battery charger protection circuit formed safe, and with constant flow and constant pressure charging mode charger. After analysis to design the circuit units lithium battery charger of the constant pressure of conversion of critical voltage value; Through the multisim simulation results indicate that the calculation and analysis to the same. Lithium battery charging circuit in the original simple constant current filling the basis of the model of added a constant pressure filling mode; Then through calculation and analysis, set out of lithium-ion batteries constant voltage conversion of critical voltage value; At the same time added a charger protection unit, effective played the overcharge protection. But in the whole battery chargers in the circuit some shortage remains to be resolved

Keywords：Lithium battery; Rectification; V oltage sampling; Constant voltage mode; Protection circuit

目录

摘要.............................................................................................................................................. I Abstract......................................................................................................................................... II 第一章锂电池充电器方案设计 .. (1)

1.1 绪论 (1)

1.2 锂电池充电器的设计方案 (1)

1.2.1 恒流充电器设计 (1)

1．2.2 恒流恒压充电器设计 (3)

1.3 方案分析 (3)

第二章锂电池充电器电路设计 (3)

2.1 电源单元 (4)

2.2 电池采样单元 (4)

2.3 逻辑处理单元 (4)

2.3.1分析与计算 (4)

2.3.2 器件介绍 (5)

2.3 恒流恒压转换单元 (5)

2．5 电池保护电路 (5)

2.6 整体电路 (7)

第三章充电器仿真实验 (7)

3.1 仿真实验 (8)

总结 (9)

参考文献 (10)

致谢 (11)

附录1 锂电池充电器电路图 (12)

附录2 锂电池充电器电路元器件明细表 (13)