邁向100 kWL之 800V SiC電動車馬達驅控器高功率密度設計演進

隨著電動車（EV） 動力系統朝向小型化與高效率發展，電動車馬達驅控器逐步轉向高電壓 800 V 碳化矽（SiC） 架構。本文說明工研院所開發之 800 V SiC 馬達驅控器的設計演進歷程，由採用薄膜直流鏈電容、已完成驗證之 60 kW/L 設計，進一步發展至透過陶瓷直流鏈電容整合以邁向 100 kW/L 之次世代架構。 透過雙脈衝測試、紅外線熱影像與動力計實驗結果顯示，在高速切換之SiC 馬達驅控器中，直流鏈寄生電感相較於電容容量大小，更主導切換應力與電壓過衝行為。研究結果證實，結合適當切換頻率與布局設計之陶瓷直流鏈電容，為實現超高功率密度電動車馬達驅控器提供一條可行的工程路徑。

The increasing demand for compact and efficient electric vehicle (EV) powertrains has shifted traction inverter design toward high-voltage 800 V silicon carbide (SiC) architectures. This article presents the design evolution of an 800 V SiC traction inverter developed at ITRI, progressing from a validated 60 kW/L configuration using film DC-link capacitors to a next-generation design targeting 100 kW/L through ceramic DC-link integration. Experimental results from double-pulse testing, thermal imaging, and dynamometer validation show that DC-link parasitic inductance, rather than bulk capacitance value, dominates switching stress and voltage overshoot in highspeed SiC inverters. The results confirm that ceramic DC-link capacitors, combined with appropriate switchingfrequency and layout strategies, provide a practical path toward ultra-high-power-density EV traction inverters.