Investigation Of Protection Design On PCB With Gas Gap To Human ESD

With the arrival and gradual deepening of the information era, the pace of the industrial production is getting faster. Low-voltage and miniaturization electronic equipment begin to show in the world. In the working environment of the instruments, it is easy to cause the discharge phenomenon, leading to electronic equipment failures and accidents, by accumulation of electrostatic charges during human body walking process. PCB with gas spark gap as an electrostatic discharge protection device, often shown in a second-level protection, can effectively prevent the occurrence of this type events. Compared with other protective devices, this devices have a advantages of low-cost and space-saving.The goal of The issue is to show the research of human body electrostatic discharge protection. Firstly, based on the testing standards, the measurement of human body walking voltage indoor is described and the experimental data under different ways of walking are obtained. Secondly, through the anarysis of the principle and characteristics of static electricity, equivalent circuit model during human walking is established to analyze the changes of walking voltage and parameters. Finally, optimize the structure by design and simulation of PCB with spark gap and conduct the test. The contents are as follows:Modeling of the human body walking voltage. In different condition of temperature and humidity, floor types and shoes types, experimental data of walking voltage is measured. Using mathematical formula, the variation of walking voltage and parameter are analyzed under different ways of walking. Through a large number of experimental data, statistical distribution of discharge is obtained. At last, with experiment and theoretical principle, electrostatic voltage complies with law of exponential increase and it obtains the statistic regulation of the maximum voltage in charging curve. Periodic changes of electrostatic voltage are caused by periodic changes of walking pace when human walks in a fixed way.Simulation and optimization of PCB with gas gap structure. Use CST software to simulate input and output voltage variation under the condition that gas gap breakdown. Depending on the structure of the gap, such as arc-to-arc structure, tip-to-tip structure, research the changes in breakdown voltage. Under the circumstance of no breakdown and breakdown, discuss and analyse the relation of the different pulse voltage and response time and the impact of breakdown voltage and pulse width. With the simulation results and experiment tests, explore the relationship between breakdown voltage and input pulse under some kinds of distance in spark gap.