Patent ID: 7728538
Filing Date: 2010-06-01
Classification: G01R,H02M

Abstract:
1. A method of estimating values of a winding current flowing, at an instant of a period, in at least one winding of a poly-phase electric load, controlled in a space vector modulation (SVM) mode through control phases symmetrical with respect to the instant, the at least one winding being cyclically coupled between a first supply line and a second supply line through respective switches, using a same measuring device alternately coupled to one of the first supply line and the second supply line, the method comprising: measuring an anticipated supply line current, flowing through one of the first supply line and the second supply line, with an anticipation smaller than or equal to a half of the period with respect to the instant and chosen such that the supply line current is equal in amplitude to the winding current; measuring a delayed supply line current, flowing through one of the first supply line and the second supply line, with a delay equal to the anticipation with respect to the instant; estimating a value of the winding current at the instant based upon the anticipated supply line current and the delayed supply line current; and fixing a threshold interval between two consecutive switching edges of a control phase of the at least one winding and another control phase of the switching period in which current measurements are to be carried out.