电工实验室恒流电子负载设计与实现
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摘要
为提高电工实验室的利用效率及降低实验成本,设计了可调恒流电子负载。利用单片机的数字端口读入电流参考值和启停信号,用片上12位DAC生成负载电流控制器参考值;底层控制采用通用运算放大器实现了PID调节器,利用模拟电路实现了恒流与过压保护选择性控制。经测试,该电子负载较好地实现了恒流负载模式,并且具有过压保护、键盘输入、数字显示功能,功能完备、成本低,能满足电工实验室的使用要求。
In order to improve the operation efficiency of the electric circuit lab as well as to reduce the running cost,an adjustable constant current electronic load is proposed in this research.The current reference command and the start/stop command are read from the digital I/O of the micro-controller and translated into a voltage level issued by the DAC on chip;the local PID control is implemented in a general purpose operation amplifier,and an analog protection circuit is designed to toggle the operation modes between constant current and protective voltage control.The experimental results indicate well functionality of constant current control as well as over-voltage protection,keyboard input,digital display.The proposed system is suitable for electric circuit lab due to its good functionality and low cost design.
In order to improve the operation efficiency of the electric circuit lab as well as to reduce the running cost,an adjustable constant current electronic load is proposed in this research.The current reference command and the start/stop command are read from the digital I/O of the micro-controller and translated into a voltage level issued by the DAC on chip;the local PID control is implemented in a general purpose operation amplifier,and an analog protection circuit is designed to toggle the operation modes between constant current and protective voltage control.The experimental results indicate well functionality of constant current control as well as over-voltage protection,keyboard input,digital display.The proposed system is suitable for electric circuit lab due to its good functionality and low cost design.
引文
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[2]韩勇鹏,霍利锋.基于MSP430F169的最小系统设计[J].山西农业大学学报,2007,6(6):216-218.
[3]李秀丽.基于MSP430单片机的数据采集传输系统的设计[J].机械工程与自动化,2011(4):163-166.
[4]童诗白,华成英.模拟电子技术基础[M].北京:高等教育出版社,2006.
[5]胡寿松.自动控制原理[M].北京:科学出版社,2007.
[6]秦龙.MSP430单片机C语言应用程序设计实例精讲[M].北京:电子工业出版社,2006.
[7]吴文进.自动控制原理课程的MATLAB辅助教学[J].安庆师范学院学报:自然科学版,2010,16(1):114-116.
[8]吴伟丽.基于MATLAB语言的自动控制系统设计与校正研究[J].中国电力教育,2009(6):140-141.
[9]刘军,刘学军.MATLAB在电力系统分析中的应用[J].电力系统及其自动化学报,2000,12(2):23-25.
[10]陈茜.实验教学法在自动控制原理“校正原理”中的应用探讨[J].价值工程,2011(32):175-176.
[11]黄闽海.LM324四运放实用电路的设计[J].福建轻纺,2002(8):26-29.
[12]郭志宏,徐迅成,范兴美.MSP430单片机实现斜率A/D转换的一种方法[J].电子工程师,2008,34(6):47-50.