Simulation Study On The Harm Characteristics And Protection Design Of EED Under Extreme ESD Environment

In order to provide support for Pyrotechnics electrostatic protection technology under extreme body static environments,the thesis research on the harm characteristics and protection design of EED under extreme ESD environment.By using numerical calculation,simulation,multi-channel measurement technology and other modern information means,this research gives a set of scientific and rational design methods and protection technology.Main research results as follow.(1)Machine model,standard body electrostatic circuit model,Sandia harsh body electrostatic circuit model,IEEE harsh body electrostatic circuit model were established by Kirchhoff circuit theory and PSPICE software.A different model electrostatic discharge body electrostatic characteristics under extreme environment simulation analysis was carried out.The results showed that the decay time,peak pressure,energy and other parameters can be drawn on the severity of the human body static model,the machine model> IEEE double RC> RC single string 500?> Sandia double RC> RC single string 5000?.A scientific basis was provided for hazard analysis and the design of electrostatic protection technology pathways.(2)A bridge wire type electric pyrotechnic electric response mathematical model was established by MATLAB and ANSYS / Multiphysics.By simulation,the relationship of the temperature distribution and the threshold ignition voltage on EED combustion process were obtained.It shows that bridge wire diameter is linear with the electrostatic ignition threshold voltage relationship.Reference to GJB 736.11-1990 EED electrostatic sensitivity test,withseries Single RC human body electrostatic discharge model series resistance 5000?,the diameter of bridge wire should be above 12?m under 25 kV electrostatic safety requirements,the diameter of bridge wire should be above 20?m under 50 kV electrostatic safety requirements.With Sandia double RC body electrostatic model,the diameter of bridge wire should be above 24?m under 25 kV electrostatic safety requirements,the diameter of bridge wire should be above 35?m under 50 kV safety requirements.A new theoretical research methods of electrostatic hazards model analysis,mechanism analysis and mechanism analysis protection technology was provided by Electric models and simulation methods.(3)The model of electrostatic field between pin and case was established by ANSOFT Maxwell software.The electrostatic field strength distribution of detonator internal structure was obtained by calculation.The correspondence between the structure of EED and the intensity distribution of the electrostatic field was revealed.The theoretical analysis was provided for electrostatic environment EED mechanism pin-to-case structure analysis.The results showed that pin-to-case electrostatic breakdown has nothing to do with the regrent.The distance of pin to case plays a major role.The closer the distance between the pin and case,the more likely a voltage breakdown happens.while glitches appear the maximum field strength was at the tip.The theory was provided for ESD protection of pin-to-case.(4)ESD PCB and protective devices for small size electric detonators were designed by simulation analysis and experimental verification.The parameter design method was proposed.The antistatic ability of pin-to-pin and pin-to-case were increased to 50 kV by TVS tube.The electrostatic voltage protection of pin-to-pin was increased to more than four times The electrostatic voltage protection of pin-to-pin was 2 times than the extreme anti-static voltage of the existing standard military standard and industry.A new technical design was provided for hazard analysis and electrostatic protection technology.