This article briefly introduces the current status and international standardization progress of the immunity test system for biosignal-driven wearable robots,discusses the basic requirements for the test system,and proposes a corresponding measurement scheme.Considering the characteristics of wearable robots,a bio-equivalent phantom that simulates a part of the living body and a signal generator that generates biosignals are the basic requirements for the test system.The proposed test system was used for electrostatic discharge(ESD)immunity testing,and the experimental results proved the effectiveness of the system.The proposed scheme provides a better option for advancing the standardization of the test system,and finally gives an outlook on the research direction of electromagnetic compatibility(EMC)for biosignal-driven wearable robots.
In this paper, the electromagnetic compatibility requirements of the vehicle indirect vision devices are described, and a radiation immunity verification test method by using an excitation light source is introduced. The layout and principles of the time delay test system of the camera-monitor system (CMS) are described. And the influence factors of the excitation light source system on the test delay of the CMS system are studied, the influence degree and reason analysis of different factors are verified by the test data.
针对无人艇电磁兼容性差导致的天线干扰舱内电气设备出现误动作的问题,结合无人艇的结构,提出了一种对舱口孔缝处使用导电材料进行填充的方法,达到屏蔽天线电磁干扰的效果.首先通过控制干扰变量,对干扰源进行定位;在确定干扰源为天线的基础上,仿真计算出受干扰设备处天线辐射的电场强度,当天线与甲板水平,舱口采用橡胶填充时,舱内设备处的最高场强高达50 V/m,采用导电材料填充后,设备处的电场强度接近于0,达到了屏蔽天线辐射干扰的效果,舱内电气设备恢复正常工作;最后通过实验验证了此方法的有效性.无人船天线与设备的距离应在设计前期进行合理规划.
某产品在试验过程中,发生了热电池点火头意外点火,进一步排查发现,在舵机自检时,容易产生意外点火,同时还发现不同供电电缆发生意外点火概率不同.通过对意外点火进行串扰电路机理分析、耦合电流仿真及电缆电感和线对电容特性仿真,揭示了点火头意外点火的原因是舵机自检产生的脉冲电流形成了耦合干扰,进而造成意外点火;电缆随机焊接导致线间分布电容差异,是引起不同供电电缆耦合干扰不同的原因.
高功率微波(HPM)通过直接或间接耦合产生的电热效应会干扰电子通信设备的工作,甚至造成不可逆转的损伤或损毁.总结了在高功率微波作用下器件失效性分析和高功率微波防护的国内外研究进展;求解了横向扩散金属氧化物场效应管(LDMOSFET)、异质结双极型晶体管(HBT)、高电子迁移率晶体管(HEMT)在高功率脉冲注入下的电热应力场分布以及阈值功率;提出了用瞬态稳压抑制器(TVS)二极管设计微波防护电路的方法.最后分析了当前研究的局限性以及后续研究方向,为电路系统的设计和安全性评估提供参考.
