Wideband contactless current sensing using hybrid magnetoresistor-Rogowski sensor in high frequency power electronic converters

摘要

High frequency power electronic converters having switching frequency higher than 1MHz require wideband, isolated and loss-less current measurement for effective controls, diagnostics and prognostics. In this work, we propose a wideband and contactless current sensing method for isolated and loss-less current measurement in high frequency power electronic converters. The proposed method combines two different sensing technologies - a Magnetoresistor sensor and a differential Rogowski coil sensor, which have complementary characteristics to achieve a wide sensing bandwidth. We demonstrate through hardware prototypes and experiments that the proposed hybrid sensor yields to a very high sensing bandwidth of DC to 10MHz. The performance of the hybrid sensor is also evaluated in a 1MHz buck converter.