Design and Realization of a High-Precision Numerical Control Current Source  

作　　者：陈明杰[1] 王向乔[1] 蔡忠见[1] 

机构地区：[1]重庆工商大学计算机与信息工程学院

出　　处：《微计算机信息》2008年第4期178-179,231,共3页Control & Automation

摘　　要：The design adopts self-designed high accurate voltage source, Micro Control Unit (MCU), D/A converter and amplifier to control the on-state of Power MOS FET, to attain constant current. The closed loop system realizes constant current output of high-precision, presettable and step-by-step adjustable, and its output current data can be directly displayed by digital devices. Finally achieve a high-precision constant current source by locking output with closed hardware loop, closed software loop, software realtime integrating, real-time filtering. The role of software is to compensate the temperature variance of sampling resistances by data segment interpolation, while the linear interpolation compensation is applied to intersegments, which improves the output precision further. It has advantages on high precision, simple construction, performance stable, easy operation, low cost and loaded capability.The design adopts self-designed high accurate voltage source, Micro Control Unit (MCU), D/A converter and amplifier to control the on-state of Power MOS FET, to attain constant current. The closed loop system realizes constant current output of high-precision, presettable and step-by-step adjustable, and its output current data can be directly displayed by digital devices. Finally achieve a high-precision constant current source by locking output with closed hardware loop, closed software loop, software rea...

关 键 词：电流源 电压源 单片机 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]