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Technical Lecture

Sensor and Sensor-less Control

T06.5 - High-Bandwidth Embedded Rogowski Coil on Multilayer Substrate with Minimal Contribution to Power Loop Inductance

Tuesday, March 18, 2025
9:50 AM – 10:10 AM ET
Location: Level Three, A313
Power modules using GaN-HEMTs require high-bandwidth current sensors for fast switching current sensing, switch device protection and system control. PCB-embedded Rogowski coils are suitable for high frequency current sensing because they are electrically non-contact and have no magnetic core. However, in conventional Rogowski coils, it is necessary to pass the current path through the center of the coil. This causes an extension of the current path, and consequently, an increase in parasitic inductance in the power loop. In this paper, we propose a Rogowski coil consisting of a multilayer PCB substrate, which pick-up coil embedded in a laminated bus bar. The pick-up coil is also designed with microstrip lines to allow measurement of high-frequency current. Experimental results confirm that the bus bar of the proposed Rogowski coil exhibited low parasitic inductance and can detect high-frequency current.