Integrated common mode capacitors for SiC JFET inverters

SiC-JFET based inverters can achieve very fast switching, hence reducing the commutation losses, at the cost of increased Electro-Magnetic Interferences (EMI). To keep the EMI conducted emissions within reasonable limits, we propose to integrate some small-values capacitors directly into the power module. Common Mode (CM) is investigated and compared with a standard configuration. The high frequency noise, which is usually difficult to filter, is contained in a close loop with the switching source, and far from the network. To demonstrate this concept, simulations are used as well as experiments on a SiC-JFET half-bridge structure. Benefits and limitations are investigated in the case of mid-power range inverters for aircraft applications.