Inverter-rectifier using SiC power devices for bidirectional wireless power transfer system of electric vehicles

Michihiro Hachisuka; Takuya Fukuhara; Yasuyoshi Kaneko; Shigeru Abe
March 2014
Materials Science Forum;2014, Vol. 778-780, p1100
Academic Journal
A bidirectional wireless power transfer system would offer many advantages when charging the batteries of electric vehicles. In a power-supply circuit, the efficiency of the inverter and rectifier is important in terms of total system efficiency. An inverter-rectifier, which is the type of power-supply circuit used in this system, performs both the inverter operation and the rectifier operation. To reduce loss of performance in both modes of operation, we decided to use silicon carbide (SiC) power devices that are capable of reducing switching loss. However, there is a problem of high conduction loss resulting from the use of SiC power devices in rectifier operation. To overcome this problem, we propose a method of parallelizing SiC metal-oxide semiconductor field effect transistors and utilizing a diode with a low forward voltage to achieve better efficiency.


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