Design Guideline and Practical Solution of PCB-type Rogowski Current Sensor for SiC MOSFET Short-Circuit Protection Based on Frequency Analysis

In this paper, design guideline of a PCB-type Rogowski current sensor (RCS) is proposed for SiC MOSFET short-circuit (SC) protection. The proposed design of RCS is explained step by step based on the frequency analysis of the Rogowski coil. Also, the input and output filters are proposed and designed considering practical situations which have sensing error, noise, and delay time. In conclusion, the sensing performance of the designed RCS is verified through double pulse test (DPT). Based on the high-performance RCS, SC tests are performed to verify the performance of SC protection. Through the experimental results, the achievement of protection is confirmed, and SC response time is measured to evaluate protection performance.