| Laser ignition is the use of high-energy laser blasting energetic materials,because of the unique form of laser energy,strong anti-interference ability,and other characteristics,has important applications in the military,aviation,aerospace,and other fields,with the rapid development of modern weapons,laser ignition system toward a high degree of integration,miniaturization.In this paper,a small laser ignition light source module was designed with a semiconductor laser as the light source,the size of which was 90mm×40mm×25mm.It could resist the interference of 20 k V electrostatic discharge and 200V/m electromagnetic radiation,to ensure the reliability of the laser ignition light source module.The main work and achievements of this paper are as follows:Firstly,based on RLC charge-discharge circuit model and integrated circuit antistatic discharge theory,the power amplifier circuit,capacitor charge-discharge circuit,and electrostatic discharge protection circuit were analyzed and designed,and the laser driver circuit simulation model was established to analyze the influence of driver circuit parameters on the output current.The simulation results show that the larger the energy storage capacitance is,the larger the average current output of the drive circuit is,and the peak value of the output current varies little.The smaller the circuit resistance is,the larger the peak value of the output current is.The smaller the loop inductance is,the smaller the rising time of output current is.According to the simulation results,the antistatic small laser drive circuit was designed.The size was 20 mm in diameter and20 mm in height.After debugging the driving circuit,the excitation current,single pulse output energy,and peak power of the semiconductor laser were tested.Secondly,based on the electromagnetic shielding design principle of electronic equipment,the shielding cavity model of the laser ignition light source module was established.The influence law of different parameters on the shielding efficiency of the cavity was simulated and analyzed.The simulation results show that when the electromagnetic wave irradiation frequency is 0.2 GHz～18 GHz,the cavity uses high conductivity materials,the greater the thickness of the cavity,the circular hole set in the cavity opening,the smaller the hole area on the cavity surface,and the higher the shielding efficiency when the cavity uses double-layer shielding.According to the simulation results and considering the cavity volume,strength,production cycle,and other factors,The thickness of 1.5mm metal aluminum material was selected as the shielding cavity to enhance the shielding efficiency of the shielding cavity,a connector was used to replace the hole for signal transmission,and the shielding efficiency of the shielding cavity was up to 74 d B.The PCB simulation model of the laser drive circuit was established,and the electromagnetic sensitivity of the drive circuit was analyzed.The simulation results show that when the electromagnetic wave irradiation frequency is 0.2GHz ～ 18 GHz and the field intensity is 0.3V/m,the coupling voltage generated on the drive circuit is 0.28 m V,which does not affect the normal operation of the drive circuit.A small laser ignition light source module was obtained by using an adaptive filter.Finally,based on analyzing the mechanism of the laser ignition test,electrostatic discharge immunity,test,and electric field radiation sensitivity test,a reasonable test scheme was designed.Through the qualified test scene,complete the test equipment debugging,and verify the ignition performance,anti-static discharge interference performance,and anti-electromagnetic radiation interference performance of the laser ignition light source module.The experimental results show that the designed laser ignition light source module has the performance of ignition initiation,anti-20 k V electrostatic discharge interference,and anti-200V/m electromagnetic radiation interference,which proves the feasibility of the design of the module. |
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