| 摘要 |
Method of control of a three-phase or multithree-phase invertor (1) supplied from a DC voltage source (2) and controlled by a processor (5) for deriving, in the course of successive slaving periods, signals for pulse-width-modulation control of the transistors of the :Invertor, It consists, from measuring the power supply current of the invertor and from taking account of the switching states of the transistors, in reconstituting the phase currents. When, within a PWM period, a time interval (ul, u2) between the instant of switching of a transistor of one phase and the instant of switching of a corresponding transistor of a following phase becomes less than a predetermined threshold value, preventing the measurement, a PWM in generated defining a measurement time interval, of sufficient duration to allow measurement of the effects of the switching on the line current, and the duration of the other PWMs of the same slaving period is reduced, by a value such that the sum of the reductions of these other PWMA compensates for the increase.in the PWM defining the measurement interval. <IMAGE> |
