Method and related device for estimating two currents flowing simultaneously through respective windings of a poly-phase electrical load driven in svm mode

A method for estimating values assumed at a certain instant of each period by currents flowing respectively in two windings of a poly-phase load controlled in a space vector modulation (SVM) mode, using a same measuring device alternately coupled to the two windings, comprising:

• coupling the measuring device to the first winding and measuring a current flowing therethrough with an anticipation from the certain instant smaller than or equal to an SVM half-period;
• coupling the measuring device to the second winding and measuring a current flowing therethrough at the certain instant;
• coupling the measuring device to the first winding and measuring a current flowing therethrough with a delay equal to the anticipation;
• and
• estimating a value assumed at the certain instant by the current flowing through the first winding based upon the two measured values with the anticipation and with the delay respectively.

A computer program loadable in an internal memory of a computer comprising:

• software code for estimating the values assumed at a certain instant of each period by currents flowing respectively in two windings of a poly-phase load controlled in a space vector modulation (SVM) mode, using a same measuring device alternately coupled to the two windings, by at least,
• coupling the measuring device to the first winding and measuring a current flowing therethrough with an anticipation from the certain instant smaller than or equal to an SVM half-period;
• coupling the measuring device to the second winding and measuring a current flowing therethrough at the certain instant;
• coupling the measuring device to the first winding and measuring a current flowing therethrough with a delay equal to the anticipation;
• and
• estimating a value assumed at the certain instant by the current flowing through the first winding based upon the two measured values with the anticipation and with the delay respectively.

A device generating signals representative of values at instants of each period by currents flowing respectively in first and second windings of a poly-phase load controlled in a space vector modulation (SVM) mode comprising:

• a measuring device to be alternately coupled to the first and second windings;
• a first logic circuit to generate a first signal representative of a current flowing through the first winding estimated by coupling the measuring device to the first winding and measuring a current flowing therethrough with an anticipation from the certain instant smaller than or equal to an SVM half-period, said first logic circuit to couple the measuring device to the first winding and measure a current flowing therethrough with a delay equal to the anticipation;
• a second logic circuit to generate a second signal representative of a current flowing through the second winding measured by coupling the measuring device to the second winding and measuring a current flowing therethrough at the certain instant;
• and
• a timing circuit that provides to said first logic circuit and to said second logic circuit, first and second pulse signals that fix measurement instants of the current through the first and second windings respectively.

A device generating signals representative of values at instants of each period by currents flowing respectively in first and second windings of a poly-phase load controlled in a space vector modulation (SVM) mode, the device comprising:

• a measuring device to be alternately coupled to the first and second windings;
• at least one logic circuit to
• couple said measuring device to the first winding and measure a current flowing therethrough with an anticipation from the certain instant smaller than or equal to an SVM half-period,
• couple said measuring device to the second winding and measure a current flowing therethrough at the certain instant, and
• couple said measuring device to the first winding and measure a current flowing therethrough with a delay equal to the anticipation;
• and
• an estimator coupled to said at least one logic circuit to estimate a value assumed at the certain instant by the current flowing through the first winding based upon the two measured values with the anticipation and with the delay respectively.