A Dual-Function Planar Magnetically Coupled Current Sensor for High-Frequency Oscillation Suppression and Switching Current Measurement

This letter proposes a planar magnetically coupled current sensor with dual functionality: suppression of highfrequency switching oscillations and accurate switching current measurement. The sensor integrates a planar coil-based snubber circuit with a resonant compensation integrator. Through magnetic coupling, the snubber enhances power loop impedance and effectively attenuates high-frequency oscillations. Meanwhile, the resonant integrator compensates for the snubber-induced resonance, enabling precise current reconstruction. The coupled coils are embedded within the printed circuit board to achieve strong mutual inductance, supporting both effective oscillation suppression and high-sensitivity current sensing. Experimental results from a double-pulse test platform verify the sensor's dual functionality and practical applicability.