A 400 kHz SiC-MOSFETs high-frequency inverter for small-foreign-metal particle detection

This paper presents the detection of small-foreign-metal particles using a 400 kHz SiC-MOSFETs high-frequency inverter. A 400 kHz SiC-MOSFETs high-frequency inverter is constructed and tested, and then applied to the small-foreign-metal particles detection on high-performance chemical films (HPCFs) with induction heating (IH). Experimental results demonstrate that the developed 400 kHz SiC-MOSFETs high-frequency inverter can heat small-foreign-metal particle on HPCFs with IH. Thus, small-foreign-metal particle can be detected with the help of a thermographic camera along with the constructed 400 kHz SiC-MOSFETs high-frequency inverter. Losses caused by SiC-MOSFETs are analyzed in detail to improve power conversion efficiency of the constructed high-frequency inverter. Experimental results also demonstrate that parallel connections of two SiC-MOSFETs effectively reduces the losses, where power conversion efficiency is 96.8 % and improved by 1.9 %.