Research And Design Of Nanosecond Pulse Power Supply

With the rapid development of plasma technology in the fields of military,medical,environmental protection and so on,the demand for the rising edge width of high-power pulse power is increasing.The pulse power supply with high repetition rate and short pulse width has gradually become the research focus.But how to steeper pulse width with higher output voltage at lower cost is also a difficulty..The paper propose a kind of low cost high voltage pulse power supply topology,which are symmetrical,aim to miniaturize the power supply and improved the efficiency.Meanwhile,the pulse width is steeped by magnetic compression technology,and the control technology of magnetic switch is further studied,which can help to achieve the development of nanosecond pulsed power supply with high stability,the main parts of this dissertation are as follows:Firstly,a symmetrical series structure of high voltage pulse power supply is proposed,which greatly reduces the cost.Based on the new topology of high voltage pulse power,the feasibility of topology under various working conditions is preliminarily analyzed and verified.The simulation model of the high voltage pulse power supply is built,and the working principle of the circuit is verified by simulation under normal operation and flashover.A high-voltage pulse power supply has been completed in the laboratory.The experiment has verified the analysis of the circuit under different conditions.The superiority of the topology compared with the existing research is proved in practical application.Secondly,the working principle of pulse magnetic compression technology is introduced,and the influence of various core parameters on the performance of magnetic switch is analyzed,which help to determine the materials of magnetic core.A magnetic core testing platform is built to measure the hysteresis curves of magnetic cores,and the difference between magnetic core materials is compared.The factors that affect the volume of magnetic switch are analyzed,and the optimal solution of magnetic switch parameters is determined by mathematical model.The principle of magnetic reset and the matching between magnetic reset circuit and pulse power supply are systematically analyzed.A 30kV/3kW nanosecond pulse power prototype is built,which verifies the feasibility of magnetic reset principle.Based on this,the possible problems and solutions in high-voltage and high-power applications are studied.Thirdly,with the shortcomings of the existing magnetic reset mode,the necessity for magnetic switch control is pointed out.The control principle of magnetic switch is systematically analyzed,and the corresponding control scheme is put forward.A simulation model of 35 kV nanosecond pulse power supply is built based on PLECS software.The feasibility and stability of the control scheme is verified by simulation,and the optimal operation interval of magnetic switch is analyzed from the perspective of practical application.