Topology Study Of High-Temperature Superconducting Pulse Power Supply For Electromagnetic Emission

In recent years,the use of inductive energy storage to achieve high power pulse discharge mode has gained more attention.In particular,the application of high-temperature superconducting inductive energy storage technology can effectively reduce the charging power requirements and improve energy utilization efficiency.The research on pulsed power supply is generally based on the study of unit topology,and then expanded to the stage of power supply modularity and multi-module co-working.Therefore,in order to build a pulse power supply with good performance,the study of the basic topology of the pulse power supply is an important guidance to improve the discharge characteristics and increase the energy utilization efficiency of the system.In this paper,the application background of electromagnetic rail gun is used to optimize the topology of inductive energy storage type pulse power supply for the arc phenomenon generated at the muzzle of the gun after the projectile is discharged,aiming to improve the energy transfer efficiency of the system.The main research elements can be summarized as follows:Firstly,typical inductive energy storage pulse power supply topologies such as XRAM and meat-grinder are studied.The advantages and shortcomings of several topologies are summarized,and an improved topology of continuous pulse power supply based on high-temperature superconducting energy storage transformers is proposed.The improved circuit uses a thyristor as the turn-off switch and utilizes the reverse current turn-off technique(ICCOS)to realize the operating mode transition.Through the principle analysis and comparative study,the improved circuit has a better current-breaking capability,can realize the real-time rapid recovery of the remaining energy from the muzzle,and the power supply device is simple and compact,which has good prospects for military applications such as electromagnetic rail guns.Then,a small high-temperature superconducting pulse transformer model is designed,the maximum vertical magnetic field component of the high-temperature superconducting coil is solved by finite element simulation,and the critical current of the superconducting energy storage coil is obtained by using the hyperbolic fitting calculation method.The joint modeling process of Simplorer and Maxwell-based single-module pulse power supply is analyzed,and the system performance indexes under different accuracy models are comparatively studied.The single-module pulse power supply has a limited discharge capacity,which cannot provide sufficient electromagnetic thrust to the projectile.Based on the consideration of improving the discharge energy level of the pulse power supply,three parallel discharge modes are analyzed and a multi-module power supply asynchronous discharge topology is built in this paper.By studying the operating characteristics of the multi-module power supply with different number of cascades and discharge modes,it is verified that the improved circuit has the characteristic of easy expansion.Finally,the effects of three adjustable parameters,namely the number of power supply modules,the delayed discharge time between modules,and the pre-charge voltage of capacitors,on the energy transfer efficiency during the operation phase of the system are investigated.The simulation results show that the system energy transfer efficiency shows a single-peak variation trend with the change of the three parameters.The continuous pulse power supply improvement circuit based on ICCOS proposed in this paper can realize the fast recovery function of residual energy and improve the muzzle ablation problem,while having a compact structure with continuous pulse forming potential,which is in line with the development trend of miniaturization and heavy frequency of pulse power supply for electromagnetic emission.