作者：田俊杰, 董威, 陈静, 柴书罡

作者单位：西安工业大学光电工程学院, 陕西西安 710032

关键词：场效应管; 恒流源; 采样电阻; 运算放大器; 稳定性

摘要：

为了提高恒流源的精度及稳定性,提出一种基于mos场效应管的恒流源原理及其制作过程,电路采用闭环反馈控制,在0 mA~5 000 mA电流连续可调,在设计中对电路关键元件场效应管、采样电阻的选取进行了必要的说明;分析了影响恒流源稳定性的各种因素,针对器件的焊接提出了具体指导意见,同时深入探讨了实际设计中出现的功耗与散热问题。通过实际测试,本恒流源电流稳定度优于0.5%,可应用于计量与检测领域。

Design of constant current power based on FET

TIAN Jun-jie, DONG Wei, CHEN Jing, CHAI Shu-gang

School of Optoelectronic Engineering, Xi'an Technological University, Xi'an 710032, China

Abstract: This paper introduced the principles and developing process of constant current powers base on MOSFET in order to improve the accuracy and stability of current source.The electric circuit used closed-loop feedback control and its current could be continuously adjusted between 0 mA~5 000 mA.The choice of critical elements such as FET, sample resistance and so on has been explained properly.The various factors which affect the stability of constant current power were analyzed and concrete instruction comments in view of component's welding were given.At the same time, power loss and radiating in the actual design were analyzed deeply.Test results show that stability of this design is better than 0.5%, and it can be used in measuring and testing.

Keywords: MOSFET; Constant current power; Sample resistance; Operational amplifier; Stability

2009, 35(1): 118-121  收稿日期: 2008-7-1;收到修改稿日期: 2008-9-29

基金项目: 

作者简介: 田俊杰(1982-),男,湖南湘乡人,硕士研究生,专业方向为测试计量及仪器。

参考文献

[1] 穆云田.基于单片机控制的直流恒流源设计[D].硕士学位论文.天津:河北工业大学,2007:1-2.
[2] 李建新.基于恒流源的电阻测量[J].现代电子技术,2004,19(186):89-90.
[3] 何希才,姜余祥.新型稳压电源及其应用[M].北京:国防工业出版社,2002.
[4] 张国华.高精度恒流源电路设计[J].设计与工艺,2001(8):37-39.
[5] 金海龙,赵军卯.基于恒流源的多路高精度测温仪的研究[J].仪器仪表学报,2006,6(27):242-244.
[6] 卫永琴,高建峰.一种恒流源电路的巧妙设计[J].仪器仪表学报,2006,8(27):1 170-1 172.
[7] 李宏生,万德钧.一种高精度恒流源的设计与分析[J].光学精密工程,1996,6(4):87-94.
[8] 郭文会,张维玲.计量用恒流电源装置的设计[J].移动电源与车辆,2005(1):42-44.
[9] 李正刚,杨厚君,林介东,等.1 A高稳定度恒流源的试制[J].现代计量测试,2000(5):42-45.
[10] 曹作群,曹 红,肖红清,等.复合型精密恒流源[J].电测与仪表,2002(11):36-38.