| Inductive energy storage pulsed power supply has the advantages of high energy storage density,fast charging speed and low working voltage,so it has great potential and advantages in maneuverable application scenarios.For the domestic and foreign research results,inductive energy storage type power supply problems,there are still many needs to be settled first,the current design of the inductive energy storage type power supply of the energy storage density is still less than the theoretical energy storage density,relative to the advantage of the capacitance type power supply cannot be reflected,in addition,the inductance type when power is applied to the electromagnetic emission energy conversion efficiency also needs to improve.In view of the above two problems,this paper optimized the core device of the inductive energy storage pulsed power supply--the energy storage inductor.The design goal is to obtain the inductive energy storage power supply with high energy density and high efficiency.The main contents of the research are as follows:(1)Firstly,the basic principle of XRAM circuit with coupling inductance is introduced.According to the basic principle,the decoupling analysis of XRAM circuit with coupling inductance is carried out,and the conclusion that the total inductance and charging current are the same,and the coupling degree has no effect on the output current is obtained,and the simulation is verified in PSpice software.Based on the above conclusions,a simple and easy to extend coupling energy storage inductor-electromagnetic rail gun co-simulation model was built,and the electrical parameters of two sets of coupling inductors were designed.The working current was 50k A and 20k A,respectively.Under the rail gun load,the 189.6g projectile was accelerated to 1900m/s and 350m/s,respectively.The energy conversion efficiency reached26.8%and 6.1%.(2)In order to optimize the design of high energy storage and small energy storage inductor,the inductor is designed as a circular spiral coil.The inductor has the advantages of compact structure and high coupling degree.The influences of the shape of the spiral coil section,the shape of the wound wire section and the distance between the wound wires on the energy storage density are analyzed,and the design scheme of the energy storage inductor with larger volume and mass energy storage density is obtained.Abstract:In this paper,the inductance 3D model with 20 levels and 3×6mm and 3×50mm cross-sectional area of rectangular conductor is established.The reliability of the energy storage inductance in charge and discharge stage is analyzed and studied.The performance indexes of the two inductance models under rated working current are analyzed in COMSOL Multiphysics.The results show that the two inductors can work stably at 20k A and 50k A respectively,and the energy storage densities are3.2MJ/m~3and 11.9MJ/m~3,respectively.The energy storage density per unit mass of the3×50mm cross section inductor reaches 6.7k J/kg,which is 6 times higher than that of the ISL designed energy storage inductor.(3)The structural parameters and electrical parameters of the inductor and the topology of the XRAM circuit are analyzed and optimized to improve the energy storage density and performance of the XRAM power supply,and the performance indexes of the XRAM power supply and the capacitive supply in the orbital launch are compared and analyzed.According to the optimized circuit topology and the characteristics of small flux leakage and superior EMC performance of the annular spiral energy storage device,a 20-stage compact XRAM power supply model was established based on the annular spiral energy storage inductor with a cross-section of 3×6mm.The total inductance was 1m H and the volume was 0.23m~3.When the charging current is 10k A,the overall energy storage density of the power module is 0.22MJ/m~3,and when the charging current is 20kA,the energy storage density reaches 0.86MJ/m~3. |
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