Miniaturization Research And Design Of Plasma Power Supply

The application direction of plasma ignition technology has gradually shifted from groundbased large-scale combustion devices to aerospace propulsion systems.In the field of aviation gas turbine ignition technology,plasma ignition overcomes some limitations of traditional spark discharge,broadens the ignition boundary,reduces ignition delay time,improves ignition reliability,and enables rapid relighting at high altitudes.Currently,the size and weight of plasma igniters in engineering applications limit their application in the aviation field.In order to expand the application range of plasma igniters and meet the requirements of reducing the weight of the plasma ignition system power supply,this study focuses on the research and design of miniaturized plasma power supply systems based on existing technologies.The main research contents are as follows:(1)By analyzing the plasma ignition principle through gas discharge,the design requirements of the power supply system for arc loads are determined.To meet the requirement of reducing the weight of the plasma ignition system power supply,a circuit system scheme that increases the operating frequency of the power supply system is determined.(2)Combined with the design method of switch-mode power supplies,a boost circuit scheme is determined.Considering the short discharge time and high current of the arc load,the discharge scheme of capacitor energy storage is analyzed and designed.By comparing and analyzing mathematical and simulation models of RC,LC,and RLC pulse charging methods in combination with the boost circuit,an arc ignition circuit with a topology similar to a positive boost converter is used.The arc load is simplified as a resistor,and a mathematical model of the arc ignition circuit is established to provide a theoretical basis for hardware circuit design and experimental testing analysis.(3)The parameters of each circuit are calculated and selected according to the design requirements,and the design schematics of each part of the circuit are provided.The prototype is tested and optimized.The formation of voltage overshoot is analyzed through modeling and LTSPICE simulation,and the optimized scheme is verified through testing.The breakdown voltage of the arc ignition circuit is more than twice the breakdown voltage in the test,meeting the breakdown requirements.(4)An experimental setup is constructed to test the discharge process of the prototype.By modeling analysis and curve fitting verification,the factors influencing the current peak during arc establishment are determined.The changes in arc state during the discharge process are discussed in detail,and an optimized discharge scheme is proposed based on the analysis of its resistance characteristics.Ignition tests in a model combustion chamber demonstrate the good ignition performance of the prototype,indicating its potential engineering application value.