绪 论 .................................................................................................................................................................. 1 1结构设计与方案选择 ..................................................................................................................................... 2
1.1 小功率整流电路 .............................................................................................................................................. 2 1.2 单相半波整流电路 ........................................................................................................................................ 2 1.3单向全波整流电路 ........................................................................................................................................... 3 1.4 桥式整流电路 .................................................................................................................................................. 3 1.5 滤波电路 .......................................................................................................................................................... 5 1.6 稳压电路 .......................................................................................................................................................... 8
2基础知识 ....................................................................................................................................................... 15
2.2 AT89C53简介 ................................................................................................................................................ 15 2.3 ADC083简介 ............................................................................................................................................... 16
3电路原理和硬件实现 ................................................................................................................................... 18
3.1 电路框图 ...................................................................................................................................................... 18 3．2整体电路设计 .............................................................................................................................................. 18 3.3 ORCAD辅助设计 .......................................................................................................................................... 18 3.4 PADC辅助设计 ............................................................................................................................................. 20 3. EILC51辅助设计5 K ....................................................................................................................................... 23 3.6电路组成及分析 ............................................................................................................................................. 23 3.7 键盘接口电路 ................................................................................................................................................ 23 3.8 液晶显示电路 ................................................................................................................................................ 24 3.9 A/D转换电路 ................................................................................................................................................. 25 3.10 主电源电路 .................................................................................................................................................. 27
4 程序设计 ...................................................................................................................................................... 28
4.1 系统核心指令系统简介 ................................................................................................................................ 28 4.2 程序流程图 .................................................................................................................................................... 29 4.3 系统初始化程序： ........................................................................................................................................ 29 结束语 .................................................................................................................................................................. 31
结论 .................................................................................................................................................................. 32 致谢 .................................................................................................................................................................. 33 参考文献 .......................................................................................................................................................... 34 附录 1 源程序 ................................................................................................................................................ 35