Research On High Voltage Pulse Power Supply Based On Avalanche Transistor

Pulse power technology(PPT),as a high-tech discipline,is committed to quickly and reliably transmitting the energy in the energy storage device to the load through the switch.High voltage pulse power supply is an important research direction of PPT and it has the characteristics of large amplitude,fast rise time,and narrow pulse width.The all-solid-state pulse source based on semiconductor switches can meet the above requirements.At the same time,it has the advantages of small size,strong controllability,high pulse repetition frequency,and etc.Avalanche transistor,as a special semiconductor switch,has the characteristics of fast switching speed(several nanoseconds),high breakdown voltage(several hundreds of volts),high peak current(tens to hundreds of amperes),and long life.Avalanche transistor can meet the requirements of fast response and high peak power.Therefore,it is of great significance to study the avalanche transistor high voltage pulse power supply.An avalanche transistor pulse power supply with high-voltage,fast-rising edge,and narrow-pulse was designed in this dissertation.Its simulation analysis and experimental verification were carried out in this dissertation.The avalanche characteristic of the avalanche transistor has been analyzed in this dissertation.According to the avalanche effect,the principle of avalanche breakdown is analyzed.A conclusion about the relationship can be obtained,which between the width of the avalanche regionΔV_B and the avalanche multiplication factor M,the miller index m,the common-emitter current amplification factorβ.Applying the theory of current mode secondary breakdown,the primary cause of the fast high-voltage pulse generated by the avalanche transistor is explained.The different control methods of the avalanche transistor and the movement of the operating point during the avalanche are given.Different types of avalanche transistor pulse circuits have been analyzed and compared in this dissertation.Through the analysis and simulation of the basic pulse circuit,the influence of each circuit parameter on the pulse voltage is determined.By analyzing the working principle and circuit characteristics of the series circuit and Marx circuit,the pulse generator circuit structure of this design is proposed.The system of pulse power supply has been designed in this dissertation.The overall design plan of the pulse power supply has been determined.It includes the pulse generator,trigger circuit,and high voltage direct current power supply.The pulse power supply system has been simulated and experimented in this dissertation.The designed pulse power supply has been simulated by Saber.The hardware circuit has been built to verify the rationality of each part of the circuit design.The energy storage capacitors at all levels are optimized to obtain a pulse voltage that meets the design requirements.