[1]付盛坤,余海,刘施宇.小电流信号的高精度采集方法[J].工业仪表与自动化装置,2019,(03):102-105.[doi:1000-0682(2019)03-0000-00]
　FU Shengkun,YU Hai,LIU Shiyu.High precision acquisition method of small current signal[J].Industrial Instrumentation & Automation,2019,(03):102-105.[doi:1000-0682(2019)03-0000-00]
点击复制

小电流信号的高精度采集方法

《工业仪表与自动化装置》[ISSN:1000-0682/CN:61-1121/TH]

Author(s):: FU Shengkun; YU Hai; LIU Shiyu; The First Aircraft Institute, Xi’an 710089, China

摘要:: 针对大功率回路中小电流信号采集精度不高的问题，提出了一种就近采集并转为数字量的方法。其中关键技术是对小电流信号就近采集，并转换为抗干扰的PWM信号进行远距离传输。文中对电流的采集方法、信号转换及抗干扰传输进行了研究。系统对小电流信号就近采集，将采集的数字量转换为占空比和电流成正比的PWM信号，并通过源端串联端接和并联电容的方法减小PWM信号的振铃噪声，从而实现对小电流信号的高精度采集。经实验验证，该采集方法在机载复杂电磁环境中能够保证信号的高精度采集。

Abstract:: Aiming at the low accuracy of small current signal acquisiton in high power circuit, a method of near acquisition and conversion to digital signal is proposed. The key technology is the long-distance transmission of small current signal which is collected nearby and converted into anti-jamming PWM signal. In this paper, the current acquisition method ,signal conversion and anti-jamming transmission are studied. This system collects the small current signal nearby, converts the collected digital signal into the PWM signal whose duty ratio is proportional to the current , and reduces the ringing noise of the PWM signal by means of series connection and parallel capacitance at the source end, thus realizing the high precision acquisition of the small current signal. Experiments show that this method can ensure high-precision signal acquisition in airborne complex electromagnetic environment.

[1] 张宏涛,王仲生.飞机电气系统故障诊断技术新进展[J].航空制造技术,2012,416(20):66-69.

[2] 夏奇兵.用分流器组件取代交流电流互感器[J].今日科苑, 2007(22):84-84.

[3] 王章启,贾俊国.断路器电寿命预测中的实用电流采样算法及误差分析[J].高压电器,2000, 36(2):22-24.

[4] 薛彦杰,苏淑靖,洪万帆.高精度数据采集电路设计及通道交叉干扰分析[J].电子器件,2017, 40(3):631-635.

[5] Bogatin E. Signal Integrity-Simplified[M]. 2004.

[6] 孙宇贞.高速电路的信号完整性分析[J].电子技术应用, 2005,31(3):73-76.

[7] 葛宝珊,李波,姚春连,等.高速数字系统中信号完整性和传输延时分析[J].计算机工程与设计,2003, 24(2):8-10.

[8] 张欣恺,刘文泉,史俊,等.基于加速度计的振动形态监测系统的设计[J].工业仪表与自动化装置,2014(1):32-35.?

[9] Green L.Understanding the importance of signal integrity[J]. Circuits & Devices Magazine IEEE,1999, 15(6):7-10.

[10] 牟涛,周水斌.高精度电子式电流互感器采集器的设计[J].电力系统保护与控制,2011, 39(20):141-144.

[11] 刘薇,张彦军,郑燕露,等.基于FPGA的多通道高精度采集传输系统的设计[J].化工自动化及仪表,2011,38(3): 99-102.

[12] 董强,倪健,刘云,等. PCB的布线设计及抗干扰技术[J].舰船科学技术, 2006, 28(2):57-59.

更新日期/Last Update: 1900-01-01