Protection circuit of normally-on SiC JFET using an inrush current

A protection circuit for the normally-on SiC JFET is proposed in this paper. The protection circuit uses an inrush current that charges DC link capacitor in the initial time. Most of all, the normally-on SiC JFET can be protected using this current. But the inrush current is not generated under the special condition when the line voltage starts at zero magnitude of voltage. Another protection circuit is added to doubly protect SiC JFET under the condition. The experimental result shows that the proposed protection circuit has good performances.