The advantages of PWM controlled rectifiers on phase controlled ones are well known. So, in order to obtain a performant d.c. source from a three-phase rectifier, two PWM structures are generally used. The comparison of PWM voltage and current structures is presented in this paper. First, their working principles and topologies are reminded, then, their whole operating points diagram, in a (P, Q) frame, are studied in the case of active and passive loads. This allows to perfectly control and optimal trajectory of the operating points defined for an application. It appears that, even though, these diagrams are nearly the same, the voltage structure is suitable for high impedance loads, whereas the current structure requires low ones. In the case of passive loads, an example of dimensioning compares their transferable power, while considering their required filtering elements, and defines their specific applications.
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