[Objective] BUCK circuits are widely used in new energy vehicle on-board power systems

industrial motor drives and other scenarios. In the application and realization of doubly-fed linear motor (DFLM)

it is necessary to design a BUCK circuit for level shifting between the on-board battery pack and the DC bus capacitor of the motor to realize its contactless feeding function. However

the ringing of this BUCK circuit introduces high-frequency noise to the DC bus capacitor

which affects the current control of the driver side of the DFLM. To address this problem

this paper proposes a ringing simulation method and suppression strategy

aiming at suppressing high-frequency ringing to provide a basis for the current control of the driver side. [Methods] Firstly

the causes of high-frequency ringing of silicon carbide metal-oxide-silicon field effect transistor (SiC MOSFET) with Kelvin source in a BUCK circuit topology were analyzed. Then

specific values of each parasitic parameter were obtained by fitting the experimental data. Finally

for the ringing suppression objective

the selection of RCD snubber circuit was optimally designed through simulation to reduce the time cost of experimenting with different selections. [Results] The error of the system simulation results obtained through parameter identification was reduced by about 20% compared to the error caused by empirical value selection. According to the proposed value selection method

the turn-off ringing overshoot voltage was reduced by 83.0% and the turn-on ringing overshoot voltage was reduced by 83.6%. [Conclusion] In this paper

a method to optimize the snubber circuit selection is proposed. Simulation and experimental results show that this method can accurately obtain the circuit parasitic parameters through a small amount of experimental data

and select components to meet the requirements for SiC MOSFET switch ringing suppression

so that the spike voltage and device switching speed are operated in the system optimal range.