[Back]

M. Baumann, J.W. Kolar:
"Minimization of the DC Current Ripple of a Three-Phase Buck+Boost PWM Unity Power Factor Rectifier";
Talk: IEEE Power Conversion Conference, Osaka, Japan (invited); 2002-04-02 - 2002-04-05; in: "Proceedings", vol.2 (2002), ISBN 0780371569/02; 472 - 477.

The modulation of a novel three-phase three-switch buck-type unity power factor rectifier with integrated DC/DC boost converter output stage is optimized concerning the ripple amplitude of the buck+boost inductor current. This is achieved by coordination of the switching operation of the buck input stage and of the boost output stage. A comparative evaluation of different modulation schemes does identify a modulation scheme which simultaneously does provide minimum DC current ripple and minimum input filter capacitor voltage ripple at minimum switching losses and/or maximum pulse frequency. All theoretical considerations are for operation in a wide input voltage range and are verified by simulations and by measurements on a DSP-controlled 5kW prototype of the system.