人体行走静电带电模型与实验研究

Electrostatic Charged Model and Experimental Study on Human Walking

静电及其放电对电子产品的安全性和可靠性有重要影响,人体静电是电子产品生产和使用环节重要的静电危害源之一。为掌握人体行走过程中的静电带电规律和影响因素,提出一种考虑了双脚和身体对地电容的、改进的人体行走静电带电理论模型。通过不同条件下的人体行走动态电位测试实验,对模型进行了验证。结果表明:对于踏步过程,当人体对地电阻大于100 MΩ时,实验与理论模型计算结果相当吻合;当人体对地电阻较小或者环境湿度较高时,实验结果除在电位最低点与理论计算有较大差别外,其他时刻一致性较好,并据此对带电方程进行了修正;人体行走时抬脚高度越高,最大电位值越大,但超过一定高度后,最大电位值基本不变,理论与实测结果一致。

Static electricity and its discharge have an important impact on the safety and reliability of electronic products.Human body static electricity is one of the important electrostatic hazards in the production and use of electronic products.In order to master the electrostatic charging rule and influencing factors in the process of human walking,an improved theoretical model of electrostatic charging in the process of human walking is proposed,which considers the capacitance of both feet and body to ground.The model is verified by the dynamic potential test experiments of human walking under different conditions.The results show that for the stepping process,when the resistance of human body to ground is greater than 100 MΩ,the experimental results are quite consistent with the theoretical model.When the resistance of human body to ground is small or the environmental humidity is high,the experimental results are consistent with the theoretical calculation except at the lowest point of potential,and the charging equation is modified accordingly.The higher the foot lifting height,the greater the maximum potential value.However,when it exceeds a certain height,the maximum potential value remains basically unchanged.The theoretical results are consistent with the actual test results.