Research And Design Of Nonlinear Power Supply For Plasma Igniter

With the continuous improvement of modern combat requirements,the performance requirements of fighter jets are getting higher and higher,and higher requirements are put forward for the working performance of aero engines.The ignition system is a key component for the successful start of the engine,which raises the working performance of the ignition system.Higher technical requirements.Plasma ignition technology,as an ignition method with a strong ignition and combustion-supporting effect,is of great significance for improving the engine’s starting and working characteristics.In this paper,the plasma ignition nonlinear power supply technology is studied,and the technical parameters of the plasma ignition power supply are determined according to the gas discharge theory.In the process of plasma ignition power supply design,based on continuous arc plasma ignition power supply technology,an overall circuit design scheme for DC power supply is proposed.According to the output requirements of the booster circuit,two design schemes for the booster circuit are proposed,and the booster circuit is determined after comparative analysis.Aiming at the particularity of the arc nonlinear load,a nonlinear load model is established.In order to reduce the output impedance of the power supply,the boost circuit is optimized and a protection circuit is added to reduce the impact of the load on the boost circuit.The simulation results of Orcad and Multisim show that after the boost circuit is optimized,the output voltage waveform of the boost circuit is significantly improved.The influence of different parameters of the trigger control circuit on the pulse control signal is analyzed through circuit simulation.According to the working mode of continuous arc high voltage breakdown and low voltage maintenance,the ignition arc circuit and the arc maintaining circuit are designed respectively.The arc ignition circuit adopts the capacitor discharge method to realize the arc ignition process,and maintains the normal operation of the arc through the voltage doubler circuit.The simulation software is used to study the influence of different parameters on the operation of the arc ignition circuit and the arc circuit,and the change trend of the influence of different parameters on the circuit output is determined.Based on the theoretical design and simulation process of the power supply,functional circuits are built and tested.Measure the output characteristics of the boost circuit under different transformation ratios to determine the best working condition of the boost circuit.The feasibility of the control circuit is verified through experiments,and the control parameters are changed to realize the change of the control signal frequency.Build the arc ignition circuit,study the influence of different parameters on the circuit operation,and compare the output characteristics of the circuit after adding the arc circuit.The research results show that after adding the dimensional arc circuit,the arc output characteristics change,the arc generated is brighter,and the arc shows a tendency to spray outwards,and the energy generated during the ignition process is greatly increased.Carry out circuit matching tests on the boost circuit and arc ignition and maintenance arc circuits.The research results show that,due to the particularity of the load,the working state of the subsequent stage circuit will affect the output of the previous stage booster circuit.Adjust the scheme and parameters in the circuit matching process to obtain the best working mode of the circuit.The test results show that the plasma ignition power supply designed in this paper meets the expected performance indicators,and provides an effective reference for the subsequent engineering of the plasma ignition power supply.