Asymmetrical Six-phase GaN-based Drive Performance Analysis with Variable Switching Frequency Control

This paper analyses the performance of a GaN-based multiphase drive when a variable switching frequency control is implemented for EV applications. The GaN-based inverters allow a wide switching frequency range, and the power losses of the inverter are reduced in comparison with other technologies such as Si. To be able to benefit from this wide switching frequency range, a variable switching frequency control with the objective of maintaining a ratio frequency 𝑚𝑓 = 17 is implemented. This control reduces the switching frequency losses above 30% in the three analysed speed points in comparison with maintaining a constant switching frequency. Hence, an efficiency improvement is achieved with the variable switching frequency control tackling one of the main problems of the EV. Key words. Multiphase,WBG, variable switching frequency control, IRFOC.