Next generation arc welding machines based on Silicon Carbide MOSFETS and high frequency planar magnetics

Silicon Carbide (SiC) Power MOSFET devices are rapidly being introduced in different applications due their advantages over their silicon (Si) counterparts. Higher switching frequency (f_sw) coupled with planar magnetics opens new possibilities in terms of increasing the power density of converter, while also improving their efficiency and lowering costs. In this paper, SiC MOSFETS and planar magnetics are employed to demonstrate new possibilities in arc welding machines technology. Design details of high power density power source for a multi-process welding machine are presented. Test results for 3.9kW/150A and 200 kHz switching frequency working at rated load and under over load condition are included.