面向SiC基电机控制器的全频带电磁干扰协同抑制方法研究

当前，新型SiC基功率器件为电机控制器的功率密度、效率等性能的提升带来了新一轮革命性机遇。然而，电磁干扰成为了新型SiC基电机控制器推广应用过程中亟待解决的核心问题。本项目从电磁干扰噪声源的物理机制出发，将新型SiC基电机控制器的全频带电磁干扰问题分解为大时间尺度的脉冲序列以及小时间尺度的开关轨迹、开关振铃等三个方面的研究，拟提出高效的全频带电磁干扰协同抑制方法。本项目重点研究以零电压开通为目标的模型预测脉宽调制技术，用于脉冲序列导致的中低频段电磁干扰抑制，并将开关行为主动配置在软开通、硬关断模式。本项目以关断电压过冲为边界条件，重点研究以关断过程优化为目标的电流源数字门极驱动技术以及缓冲电路优化设计方法。本项目研究成果可为系统解决SiC基电机控制器的电磁干扰问题提供技术方案，将有效推动新型SiC基电机控制器的高效可靠应用。

At present, SiC based power devices bring a revolutionary opportunity for the improvement of power density, efficiency and other performance of motor controllers. However, electromagnetic interference (EMI) has become the key problem to be solved in the application of new SiC motor controllers. This project starts from the physical mechanism of EMI noise sources, where the full-band EMI problem of the new SiC based motor controller is decomposed into three aspects: pulse sequence of large time scale, switching trajectory and switching ringing of small time scale, and presents an efficient cooperative suppression method for full-band EMI. This project focuses on the research of model-predictive PWM technology with zero voltage switching as the goal, which is used to suppress EMI in the middle and low frequency bands, and actively configures the switching behavior in soft turn-on and hard turn-off modes. This project takes the turn-off voltage overshoot as the boundary condition, and focuses on the research of current source digital gate drive technology and snubber optimization design method, with the goal of turn-off process optimization. The research results of this project can provide a technical solution for dealing with the EMI problem of SiC based motor controllers, which will effectively promote the efficient and reliable application of new SiC based motor controllers.