Integrated Research On The Electromagnetic Protection Of Semiconductor Bridge Igniter

Copmpared with bridgewire electro-exploding devices,semiconductor bridge(SCB)ig-niter has the advantages of better ignition performance and safety.and gradually showed large-scale application prospects in modern weapon system.But the safety of SCB should be strengthened in the case of harsh electromagnetic environment.Therefore,in this dissertation.SCB was electromagnetically protected by integrated protection circuit on the base of the ex-isting SCB technique.Firstly the circuit model about SCB was established in PSpice software,The electromagnetic protection effect of discrete components has been simulated,best elec-tromagnetic design was achieve by assembly of discrete components,a new integrated protec-tion circuit has been designed,and the effect on SCB’s ignition performance and safety by integrated protection circuit was researched with simulation and experiments.The main re-search conclusions are as follows:(1)The circuit model about SCB was established in PSpice circuit.Four test conditions have been defined according to the electromagnetical environment and domestic and interna-tional standards:standard capacitor discharge conditions(22μF,16V),standard constant current discharge conditions(5A,10ms),electrostatic discharge conditions(25kV,500pF,500Ω),safety test conditions of constant current(1.5A and below,300s).The circuit model about SCB has been tested and the results show that the model was basically coincides with actual situation of SCB.(2)The effect on electromagnetic protection effect and ignition performance of discrete components(MOS tube and resistances with series-parallel connection and transient suppression diode)to SCB has been researched in four test conditions.And selection design has been simulated due to the results;the results show D type MOS tube and resistances with series-parallel connection and P6SMB15CA type transient suppression diode are suitable for integrated circuit protection.(3)The integrated circuit protection has been designed by simulation of discrete compo-nents,the effect on SCB’s ignition performance and safety by integrated protection circuit was researched with simulation.The ignition performance of capacitor discharge and constant current discharge is less affected,the electrostatic protection was strengthened,the maximum current through the SCB dropped to 22A from 50A,the energy on SCB dropped to 0.136mJ from 0.312mJ.Radio frequency(RF)protection was strengthened and prevent 0.8A constant current and following through SCB.(4)Design and processing of integrated circuit protection has been conducted under simulation results,and Electrical properties of integrated circuit protection were tested which indicates that the design meets requirements.The ignition performance under capacitor dis-charge(22μF,16V)and constant current discharge(5A,10ms)was tested,the results show outbreak time was delayed,igniton time and burst energy have no significant difference.(5)Integrated circuit protection greatly improved electrostatic protection under discharge conditions(500pF,500Ω),critical electrostatic discharge voltage without damage for SCB with integrated circuit protection improved to 25kV from12kV.(6)Integrated circuit protection greatly improved safety under constant current,critical current without damage for SCB with integrated circuit improved to 1.4A from 0.9A which improved to 1.5A with heat sink.