Multi-channel SiC SSPC Electrothermal Simulation And Parallel Current Sharing Design

Solid-state power controller(Solid-state power controlle,SSPC)integrates the conversion function of the relay and the circuit protection function of the circuit breaker.It has the advantages of small size,fast response and non-breaking arc.It is a multi-electric and fully-electric aircraft configuration.The core of the electrical system.Compared with traditional Si MOSFETs,Si C MOSFETs have the advantages of high breakdown field strength and high operating temperature,and have good application prospects in solid-state power controllers.At present,multi-channel Si C solid-state power controllers mainly face problems such as inaccurate analysis of electrothermal characteristics and unbalanced multi-channel current distribution,resulting in unstable performance of solid-state power controllers,which cannot meet actual application requirements.Therefore,this article takes the multi-channel Si C solid-state power controller as the research object,and researches its temperature field simulation analysis,multi-channel electrothermal characteristic analysis,multi-channel parallel current sharing and other content,etc.,to provide domestic high-performance multi-channel Si C solid-state power controller Technical Support.First,the simulation model of Si C MOSFET power module is established to achieve accurate analysis of Si C chip temperature.Based on the thermal circuit theory,the thermal circuit model of the Si C MOSFET power module is established,and the steady-state operating temperature of the MOSFET and the transient temperature rise during the pass-through process are analyzed;The temperature field distribution and the transient temperature change curve of the switching process,and the accuracy of the simulation result is verified by actual measurement.Secondly,the electric heating simulation model of the multi-channel Si C solid-state power controller is established to realize the accurate analysis of the electric-heat characteristics of the multi-channel Si C solid-state power controller.The circuit simulation model of multi-channel solid-state power controller is established to analyze the switching characteristics of SSPC under different load conditions;the thermal simulation model of multi-channel solid-state power controller is established to perform steady-state temperature field simulation and transient temperature field simulation analysis of the whole machine.Then,a multi-channel parallel current sharing design method of solid-state power controller is proposed to achieve uniform current distribution of the multi-channel solid-state power controller.Analyze the influence of parasitic parameters on the switching characteristics of solid-state power controller,optimize the layout of solid-state power controllers,and reduce the influence of parasitic parameters on the switching characteristics of solid-state power controllers;adopt Taguchi's robust design method to perform multi-channel parallel current sharing on solid-state power controllers.Design to improve the consistency of the multi-channel current distribution of solid-state power controller.Finally,a multi-channel Si C solid-state power controller prototype test platform was built to verify the effectiveness of the parallel current sharing design.Design a prototype multi-channel Si C solid-state power controller,detail the hardware circuit design and software solution of the solid-state power controller,test the current distribution of the multi-channel Sic solid-state power controller,and verify the effect of parallel current sharing.