面向Si/SiC混合器件逆变器全寿命周期安全工作区的多开关模式主动切换策略

基于硅基绝缘栅双极型晶体管(Si IGBT)和碳化硅金属氧化物半导体场效应管(SiC MOSFET)的Si IGBT/SiC MOSFET混合器件采用多开关模式切换策略可使变换器具备应对复杂工况的能力，然而现有切换策略并未考虑器件疲劳老化对模式切换阈值电流的影响，在混合器件老化进程后期极有可能造成器件热失效，进而严重威胁变换器的可靠运行。基于此，提出了一种面向Si/SiC混合器件逆变器全寿命周期安全工作区的多开关模式主动切换策略。基于器件疲劳老化对逆变器最大安全运行电流的影响规律，设计了考虑老化进程的逆变器安全工作区刻画流程。根据安全工作区刻画结果，提出了适用于混合器件全寿命周期的多开关模式主动切换策略。实验结果表明，该策略能够针对混合器件不同老化程度来动态调整开关模式切换阈值电流，从而在器件全寿命周期内保障逆变器的运行可靠性。

Multi-mode active switching strategy for safe operating area of Si/SiC-hybrid-switch-based inverter throughout life cycle

By adopting a multi-mode switching strategy for the Si insulate-gate bipolar transistor(Si IGBT)/SiC metal-Oxide semiconductor field-effect transistor(SiC MOSFET) hybrid switch, the converter has the ability to cope with complex operating conditions. However, the influence of fatigue aging on the mode switching threshold current is not considered in the existing switching strategies, which is likely to cause thermal failure of the hybrid switch at the late stage of the aging process, which seriously threatens the reliable operation of the converter. Based on this, a multi-mode active switching strategy for safe operating area of Si/SiC-hybrid-switch-based inverter throughout life cycle is proposed. Based on the influence of fatigue aging on the maximum safe operating current of inverter, the characterization process of the safe working area of the inverter considering the aging process is designed. According to the results of safe operating area characterization, a multi-switching mode active switching strategy suitable for the whole life cycle of hybrid switch is proposed. The experimental results show that the strategy can dynamically adjust the switching mode to converse threshold current for different aging degrees of hybrid switch, so as to ensure the operation reliability of the inverter throughout the switch whole life cycle.