Design And Research Of Self-adjusting Low-temperature Plasma Pulse Power Supply

As a new energy utilization method,low-temperature plasma has been widely used in various fields such as biomedicine,exhaust gas treatment,flow control,and material surface modification.As a low-temperature plasma excitation method,pulsed power has the advantages of high power density,high reduced electric field strength,and the ability to generate a large number of high-energy particles.The current low-temperature plasma pulse power supply research is mainly concentrated in the fields of high voltage,high power and single discharge structure.In order to design a low-power pulse power supply that adapts to different discharge structures and can generate low-temperature plasma more efficiently,the paper has done the following research:Based on the theoretical analysis of gas discharge,the discharge conditions of low temperature plasma are summarized.The factors influencing the discharge of low temperature plasma are analyzed by discharge experiments.The method of determining the effective value of the detection voltage is used to calculate the optimal working frequency of the discharge device,so as to realize the adaptive control scheme of pulse discharge.By analyzing the technical specifications of the power supply,the overall implementation scheme of the adaptive low temperature plasma pulse power supply is designed.The discharge circuit uses half bridge inverter circuit and high frequency transformer to drive the discharge device to produce low temperature plasma.For the adaptive control of pulse discharge,based on the RMS conversion circuit of output voltage,the discharge device is calculated by dichotomy,so as to narrow the scanning range,achieve the best working frequency and achieve the discharge effect.The circuit design of the low-temperature plasma pulse power supply was completed according to the overall power supply scheme.Based on the working conditions of the circuit,the half-bridge inverter circuit and high-frequency transformer in the discharge circuit are designed,and the key parameters are calculated;the design of the adaptive control hardware circuit and the power supply module is completed.According to the circuit design,an adaptive low-temperature plasma pulse power system was built in sub-modules,and the system was tested and analyzed.The results show that the designed pulse power supply meets the expected requirements,can meet the discharge requirements of different discharge devices,and realizes the adaptive control function.Through the discharge performance experiment,it is found that compared with the traditional frequency sweep method,the adaptive method can reduce the minimum input power voltage during discharge,reduce the heating speed of the transformer,and improve the efficiency.At the same time,it can be achieved in the experiment of processing water mist with the cutting-edge discharge structure More stable discharge effect.