Current Estimation for Pulsed Power Applications

Abstract

This paper presents a current sensing method to estimate the load current in pulsed current applications using a current transformer. The droop effect generated by this kind of sensor when measuring dc currents is compensated by means of signal processing techniques. The method is based on the inclusion of a sensor model in the system model so as to obtain an extended state-space model enabling to estimate the load current. A Kalman observer is employed in order to obtain an estimation with high noise rejection. The implementation of the observer in an FPGA platform allows the incorporation of this block as a stage independent of the converter control. Experimental results validate the implementation of the proposed system.