Patent ID: 6195274
Filing Date: 2001-02-27
Classification: G01R

Abstract:
A method of defining an instantaneous value of a current (i2e) of a pulse-controlled inductive load when the impedance of the load is known, the method comprising the steps ofmeasuring the output voltage (u1) of a pulsed voltage source, andmeasuring the output current (i1) of the pulsed voltage source,the method being characterized by further comprising the steps oflow-pass filtering the measured output current (i1) of the pulsed voltage source to produce a fundamental wave current (i1lp),defining a load current estimate (i2est) by computation on the basis of the measured output voltage (u1) of the pulsed voltage source and the impedance of the load,high-pass filtering the load current estimate (i2est), anddefining the instantaneous value of the load current (i2e) by adding the high-pass filtered load current estimate (i2hp) to the fundamental wave current (i1lp).