Research On The Key Technology Of Long-term Repetitive Frequency Pulse Power Supply

In recent years,pulsed power technology has been widely used in many fields such as environmental protection,national defense,and high-tech research.The pulse power supply is an important part of the pulse power device.For this reason,this article has carried out research on the design and development of the pulse power supply.This article focuses on the need for pulse power supply repetition frequency and continuous long-time work in practical industrial applications,and focuses on two important parts of pulse power supply: high-voltage high-current switch and high-voltage charging power supply.In-depth and extensive research on the current research status of high-voltage and highcurrent switches and charging power supplies has been conducted,and the key factors that restrict the repetition frequency of pulsed power supplies and continuous long-term work are analyzed.On this basis,the thyristor and charging power supply in high-voltage and highcurrent switches are selected.As the main research object,the series resonant power supply in the series has studied the dynamic characteristics and thermal characteristics of the thyristor.The high-voltage series resonant charging power supply in the pulse power supply has been developed,and based on the application requirements such as air purification,a compact nanosecond pulse power supply has been developed.First,according to the working principle and dynamic characteristics of the thyristor,based on the unified discrete time-domain modeling method,the uneven voltage distribution caused by the inconsistent turn-on characteristics of the thyristor is analyzed.In order to increase the repetition frequency of the thyristor,the reverse recovery characteristics of the thyristor are simulated and experimentally analyzed,and an improved reverse recovery current model is proposed.At the same time,the thermal characteristics of the thyristor are studied,and the temperature difference between the case temperature and the junction temperature of the thyristor and the transient and steady-state temperature changes of the thyristor are simulated and calculated according to the thermal resistance model of the thyristor,and then the case temperature of the thyristor is measured.Provide a safe and reliable working time range for the thyristor.The charging rate and stability of the charging power supply are the key factors for the repetitive and continuous long-term operation of the power supply.This article designs and develops a charging power supply used in pulse power supplies.Based on the principle of series resonance charging,the main circuit parameters,protection circuits,auxiliary circuits and control programs are designed.The charging power supply can stably output the charging voltage from 1 to 10 k V,and the maximum output is adjustable.The power is 60 k W.And designed the Labview man-machine interface,which can realize the remote measurement,remote sensing,and remote control of the charging power supply,and the working principle and load of the charging power supply are combined with the characteristics of the high-voltage and high-current switching thyristor,and the power device protection scheme is designed.Finally,this article develops a nanosecond pulse power supply based on application requirements such as air purification.Firstly,the working principle and conduction mode of the avalanche transistor are introduced.The Marx circuit is selected as the main circuit of the nanosecond pulse power supply,and circuit improvements are made to improve the stability of the nanosecond pulse voltage.Finally,the working frequency is 500 Hz and the output voltage is 3k V.,A compact nanosecond pulse power supply with a voltage rise time of 5ns.The entire pulse power supply device is only 80mm*40mm*30mm in size,which can be used in civilian small pulse power supplies.