摘要
提出了一种基于多MOSFET并联均流的高稳定度大电流恒流源研究方案,输出电流最高可达30 A且连续可调,输出30 A时,30分钟内电流稳定度优于5 ppm。文中详细分析了恒流源基本稳流电路的工作原理,并对电路中关键元器件的选型进行了分析说明。通过高精度基准电压芯片和基于大功率精密电阻采样的电流串联负反馈方法提高系统的稳流精度,通过多只功率MOSFET并联均流工作作为调整管,实现了输出大电流的高稳定度,同时对影响功率MOSFET并联工作的因素进行了系统分析。提出的恒流源方案,对高稳定度直流电源的设计具有一定的参考价值。
In this paper,an approach for a high stable constant current source is presented,which is based on multiple power MOSFETs paralleling connection method,the maxim output of current source is up to 30 A,and it is continuously adjustable. The performance of the designed constant current source has been tested,and the measurement results indicate that the stability of constant source is better than 5 ppm when the current is 30 A. The working principle of the designed constant current circuit is analyzed in detail,and the selection of key components is explained clearly. We use the high precision reference voltage source and current series negative feedback based on high-power precision sample resistor to increase the stability of system. In order to realize the high stable current,multiple MOSFETs in paralleling connection are used as regulator,and systematic analysis on factors affecting MOSFETs in paralleling work are presented as well. The constant current source that we designed has a certain reference value for the design of DC current source.
出处
《电测与仪表》
北大核心
2016年第12期81-86,共6页
Electrical Measurement & Instrumentation
基金
国家重大科学仪器设备开发专项项目(2011YO090004)
关键词
恒流源
高稳定度
串联负反馈
MOSFET并联均流
constant current source
high stability
series negative feedback
MOSFET paralleling connection
作者简介
张存凯（1990-），男，硕士研究生，从事高稳定度电源系统及精密电磁测量研究。Email：zckalwin@126．com
李正坤（1977-），男，中国计量科学研究院研究员，主要从事精密电磁测量、电学量子基准和质量量子基准的研究工作。
陈乐（1959-），女，中国计量学院教授，硕士生导师，从事温度计量校准方向研究。
张钟华（1940-），男，中国计量科学研究院研究员，中国工程院院士，从事精密电磁测量及量子计量标准研究。
