摘要
该数控恒流源基于单片机控制,采用模块化设计,提高了恒流源的输出精度和稳定度。通过开关和键盘来设置输出电流值,配合INTEL AT89C55单片机的编程实现数字控制和显示;同时用DAC0832实现D/A转换,输出模拟控制电压,再由运算放大器和功率三极管组成的深度电流负反馈系统来实现输出电流的恒定。经过实验及MATLAB仿真分析,测出系统的输出电流误差小于1mA,纹波电流不大于0.2mA。
The numerical control constant current source uses microcontroller＇s control and modularity＇s design to improve its output accuracy and stability.It uses the switch and the keyboard to set the output current value to achieve digital control and display with INTEL AT89C55 microcontroller＇s programming.At the same time,it achieves D/A converter with the DAC0832 to output analog control voltage then the depth of the current negative feedback system composed by operational amplifier and power transistor to achieve a constant output current.Through experiments and MATLAB simulation,it measures the system output current error less than one milliampere and ripple current less than 0.2 milliampere.
出处
《电测与仪表》
北大核心
2011年第6期75-78,共4页
Electrical Measurement & Instrumentation
关键词
数控直流恒流源
运算放大器
DAC0832
numerical controlled constant-current source
operational amplifier
DAC0832
