| Abstract |
Practical evaluation of a new 3-phase-bridge PWM Buck-Mode (or Current-Source-Type) PFC rectifier for Telecommunications Energy System is introduced. The necessity, the advantages and disadvantages of this type PWM rectifier in the application are briefly 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 PWM Buck-Mode PFC rectifier are introduced.
The features of the new rectifier obtained by the new PWM scheme, i.e., - high efficiency (95% at rated load) due to significant reduction of inductance of the dc-inductor (less than 0.5 [mH]), - simple modulation process (even simpler than PWM-boost-type) and - robustness of the line-current waveshaping performance against large dc current ripples (under a small dc-inductor)
have been confirmed through experimental results obtained from a 12 [kW] real product. Furthermore, variation of the efficiency and Total-Harmonic-Distortion of the input line current for several dc-inductor arrangements are evaluated, and some hints to improve the performance are described. |
