开关磁阻电动机功率变换器开关器件并联均流设计研究

he design of power converter of switched reluctance motor is one of the key technologies of the drive system. According to the switched reluctance motor operation requirements and design goals, considering the power converter cost and efficiency, this paper based on asymmetrical half bridge topology, choose four MOSFETs in parallel to constitute the main power switch device, to realize the design of power converter for low cost and high efficiency. Taking into account the MOSFET parallel use will lead to uneven flow phenomenon, this paper for the main hardware parameters may cause uneven flow: gate series resistance Rg, device through resistance RDS (on), drain pole electrical leads LD, a source electrode lead inductance LS were studied. Based on the analysis of hardware parameters, the layout and routing optimization scheme of parallel MOSFET is proposed. Based on the results of hardware optimization, the phenomenon of uneven flow is corrected by software optimization control. From chopping mode will be switched reluctance motor (SRM), division of the control mode for single tube chopper, dual chopper, turns the chopper three way and of three control modes were thermal analysis. It is found that the control mode of rotating chopper has good performance in both the MOSFET and the power converter, that is, the MOSFET has the best effect in the rotating chopper control mode. In this paper, the design idea of the power converter is proposed, which is based on the average flow and the software control. After the simulation analysis and experiment verification, the average flow and thermal distribution of the power converter are satisfied.