This paper presents a heterotypic current transformer design. A ferrite rod wound with copper wires is placed into a Ω shape current conductor tube. This solution can be easily integrated into bus bars or power modules. The modeling analysis and design considerations of Ω-shape copper tube are discussed. The high insulation capability was realized by encapsulating the current transformer into silicone gel. Preliminary experimental Hi-Pot test proves the insulation capability up to 5 kV. Additionally, a double pulse test is carried out to evaluate the proposed sensor performance for overcurrent protection of SiC MOSFETs.
