THREE-PHASE BUCK RECTIFIERS

摘要

A new 3-phase current-source-type (or buck-mode) PWM PFC rectifier is proposed. The necessity, the advantages and disadvantages of this type PWM rectifier are discussed first. Then, the new power circuit topology and the modulation scheme to eliminate or mitigate the disadvantages and obtain further new advantages of the current-source-type PWM rectifier are introduced. The features of the new rectifier, i.e., high efficiency, simple modulation process, robustness of the line-current modulation against distortion and asymmetrically of the utility voltages and dc current ripples have been confirmed through experimental results obtained from a prototype 12[kW] rectifier of real product.