Research On The Time-domain Spectral Element Method Of Electrostatic Discharge

Electrostatic Discharge(ESD)refers to a large number of charge transients that occur when objects with different electrostatic potentials are in direct contact or close to each other.Electrostatic discharge usually has high voltage,high current,strong radiation and other characteristics,ESD is one of the important reasons witch leading to a variety of electronic equipment damage.The IEC specifies the discharge modes of two ESD simulators:contact discharge and air discharge.In this paper,the corresponding numerical simulation model is established for these two kinds of ESD modes,and the simulation is carried out by using time domain spectral element method(SETD).Aiming at the contact discharge,this paper uses the time domain spectral element method to study the three-dimensional physical simplification model and the equivalent circuit model of the ESD generator respectively.The accuracy and validity of the equivalent circuit model of ESD generator are verified by comparison.On the basis of this,hybrid simulation by SPICE-like and the time domain spectral element method are carried out to study the interference problem caused by the contact electrostatic discharge.As a result of the use of electrostatic ESD generator equivalent circuit model instead of the physical simplification model,thus greatly reducing the unknown number of the simulation,saving the calculation time.The transient process of short-gap gas discharge is studied deeply according to the fluid model.the flux transfer method(FCT)is combined with the time domain spectral element method to deal with the relevant equations,and the simulation of the electronic and electric field intensity distribution in the short gap gas discharge channel is realized.On the basis of this,the transient changes of the discharge current and the velocity of the discharge channel are analyzed.Then the effects of pressure,background electric field and initial charge on the discharge of short gap gas are studied.The simulation results show that the background electric field and the pressure will affect the motion state of charged particles.The larger the background electric field is,the smaller the air pressure is,the faster the discharge current grows.The simulation results are in good agreement with the literature results.