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Sensor and Sensor-less Control

D16.4 - A Bridge-Pair Magnetic Field Detection Architecture for Enhanced dv/dt Rejection in Switch Node Proximity Current Sensing

Thursday, March 26, 2026
12:00 PM - 1:45 PM CT
Location: Hemisfair Ballroom
Modern power conversion systems incorporate switch-mode power supplies to efficiently manage and control power throughout the network. The growing demand for higher efficiency and power density has enabled megahertz conversion using wide-bandgap devices, where instrumentation becomes prone to unwanted interference and noise. In this work, a novel approach provides current-sensing immunity against extreme dv/dt incidents. This extends proximity magnetic-field bridge detectors to switch-node integration, a key enabler of compact power-management units. The experimental results demonstrate effective compensation for high dv/dt–coupled noise on the switching node of a synchronous GaN HEMT buck converter operating at 500 kHz and experiencing transients above 14 V/ns. The approach is implemented using two same-plane sensing dies, increasing sensitivity and maintaining a compact, surface-mount form factor.