WBG semiconductors enable power electronics systems to operate at wide ranges, requiring minimally invasive current sensing elements for enabling real-time diagnostics and control of online system operations. In these converters, however, the requirements make it extremely difficult to develop/integrate a current measurement scheme for switching-current sensing; for instance, many existing current sensors may not be suitable for lateral GaN switches with very tight layout requirements and extremely EMI emission and fast switching speeds. The installation of spiral coils or flat-shaped current sensors embedded on/under the trace of the PCB would typically be more appropriate in this situation since they are easy to install and do not require additional mounting space, enabling them to be compact and flexible. An embedded Rogowski coil-based differential current sensor will be proposed, constructed, and tested for contactless ultrafast switch-current measurement in lateral switches or on-trace sensing.
