| Pulse inductor is the intermediate energy storage device in pulsed power supply,mainly to regulate the current pulse width and current limiting role,not only occupy a large part of the space,but also the main source of magnetic field interference in pulsed power supply.With the development of pulsed power supply,key devices such as pulse capacitor and semiconductor switches are limited by materials and production processes,making it difficult to make new breakthroughs.The structure of pulse inductor is simple,its associated calculation analysis and optimised design are important for the development and application of pulsed power supply.This paper focuses on the calculation and analysis of three types of inductors(solenoid inductor,planar spiral inductor and toroidal indutror)in pulsed power supply.The main research contents are as follows:1.Calculated inductance,magnetic induction strength and electromagnetic force for solenoid inductor and planar spiral inductor wound by rectangular cross-section wire.In order to simplify the calculation of the inductor,the inductor coil is simplified as a collection of circular coils,and the current density of the coils is inversely proportional to its radius is considered.Processing the inductance,magnetic induction strength and electromagnetic force calculation equations for solenoidal inductor and planar spiral inductor to expressions based on one or two integration,the correctness of the equations derived in this paper was verified using the filament method and the finite element method.The electricmagnetic force on the coil and the magnetic field distribution of solenoidal inductor and planar spiral inductor were analyzed in detail.In addition,transient inductance,transient magnetic induction strength and transient electromagnetic forces have been calculated for solenoidal pulse inductor and planar spiral pulse inductor using the finite element method.2.Calculated inductance,magnetic induction strength and electromagnetic force for toroidal inductor wound by rectangular cross-section.To simplify the calculation of toroidal inductor,the toroidal coil is simplified into two calculation models: a thick-walled toroidal structure and a collection of self-closing circular coils.The inductance,magnetic induction strength and electromagnetic force of the toroidal inductor were calculated using two calculation models and finite element method,also taking into account that the current density of the coils is inversely proportional to its radius.The calculation process is simple when calculated by the thick-walled toroidal structure,but the results are inaccurate;the calculation process is complex when calculated by the collection of individual closed coils structure,but the results are accurate.In addition,transient inductance,transient magnetic induction strength and transient electromagnetic forces have been calculated for toroidal pulse inductor using the finite element method.3.Analyed the relevant physical characteristics of three types of inductors changing with shape.Introduce the inductor shape parameter,a detailed comparison and analysis of the volume,resistance and magnetic field distribution of the three thin-wall(foil)inductors with the shape parameter changes,a comparative analysis of the three types of pulse inductors wound by rectangular cross-section wire and a summary of their advantages and disadvantages are also presented.4.Optimal design of inductor and structural optimisation analysis of inductor-based pulsed power supply.A multi-objective optimisation design method for the most commonly used solenoid inductor in pulsed power supply is proposed.The method considers inductance constraints,profile size constraints and temperature rise constraints,gives three optimisation objectives for volume,resistance and external magnetic induction strength,and uses multilayer screening and weighted summation methods to optimise the pulsed inductor multiobjectives.This method was used to design the 16μH solenoid pulse inductor required for a250 k J pulse power module.Based on the 16μH pulse inductor obtained from the design,the structure of the 250 k J pulse power module was designed.The magnetic interference inside the pulse power supply caused by the different placement modes of the inductor in the pulse power module,the different arrangement modes of the pulse power modules and the different discharge strategies of the pulse power supply are analyzed. |
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