A novel isolated current sensor for high-performance power electronics applications

A planar current sensor, comprised of a magnetic current transformer and a Hall-effect element, is presented. The sensor has a broad frequency bandwidth from DC up to 30 MHz, a high current rating (40 A DC), superior linearity, high EMI immunity, small size, robustness and low realization cost. The main design formulations are given analytically; simulations and finite element results are presented for verification. Experimental results of current step response and dv/dt immunity are included.