400kHz, 300W SiC BJT Based High Power Density PFC Converter

SiC BJT is a very promising switching power device because of its ability to operate at high temperature. This capability, coupled with ultra low conduction and switching loss, will facilitate very high frequency operation. This will have a significant impact on applications such as PFC where power density is of high interest. In this paper, an all SiC PFC is designed and implemented. In order to achieve ultra low loss, a new drive method is implemented that uses a conventional MOSFET driver to drive the SiC BJT. Based on this method, the turn on and turn off loss of the SiC device can be reduced significantly. Based on the measured loss, the maximum operating frequency of the PFC converter is predicted. Experimental demonstration at 400kHz and 300W is presented in this paper.