Continuous Sense-FET Current Measurement in a GaN-Based T-Type Bridge-Leg With Monolithic Bidirectional Switch

This letter introduces a GaN-based T-type bridge-leg using three GaN power ICs, including a monolithic bidirectional switch (MBDS), with a novel sense-FET-based method for continuous phase current measurement. Experimental results at 200 V demonstrate the current sensing up to ±4 A across all four operating quadrants. The approach could enable high-bandwidth, nearly lossless current measurement, and is applicable to various converter topologies.