Research On Vehicle Motor Driver Based On SiC Module

As a new type of power device,SiC module has the advantages of fast switching speed,good temperature performance and high withstand voltage level,so SiC MOSFET is more suitable for high-frequency high-power inverter than Si IGBT and Si MOSFET,with switching frequency enhanced and power density reduced.In this paper,the design of SiC MOSFET driver circuit is studied.A double pulse testing(DPT)experiment is set up to test the switching characteristics of SiC devices.Then,the high frequency oscillation and crosstalk problems caused by SiC module are analyzed to take good advance of this device.Thus,it is vital to select appropriate gate resistance to give full play to its high performance.Vehicle motor driver needs a high power density,based on the SiC module,this paper designed a high power density automotive motor driver.Based on this machine,vector control strategy,flux-weaken control technology,parameter tuning of PI controller and the hardware design of signal sampling circuit are studied.In addition,the control algorithm and PI parameters are verified by Matlab/Simulink.This paper further studies the space vector modulation method of motor driver.Foucing on switching loss and common-mode voltage,this paper researches discontinuous modulation and minimum common-mode voltage modulation.Generalized discontinuous PWM algorithm is posed to obtain the uniformization of different DPWM method.Minimum common-mode voltage modulationthe is realized by the use of generalized scalar PWM approach.Based on these,a rotating tri-state pulse width modulation(RTSPWM)method is proposed,its software implementation is given.Through the theoretical calculation,a variety of modulation strategies are compared quantitatively,which proves the superiority of RTSPWM.Finally,experiments show that the RTSPWM strategy is feasible in practice.