Principle for a Boost-Converter Derived Three-Phase-PFC-Rectifier for Charging Stations and Industrial Applications

Abstract:
This paper presents a novel boost-converter derived three-phase PFC-rectifier. For the introduction of the new circuit first an overview of the state of the art of three-phase PFCrectifier topologies is given. One topology in particular, the Vienna-rectifier, is very common in charging stations for emobility. As a much simpler alternative there is the three-phase single-switch DCM-PFC-rectifier, which disadvantageously does not take up a completely sinusoidal current from the grid. The new topology is based on the aforementioned topology’s approach. By modification of the principle to the three-phase two-switch-DCM-PFC-rectifier with mid-point capacitance, the voltages drops across the inductors are influenced such, that sinusoidal current shapes comparable to those of the Viennarectifier result. The function and the optimal sinusoidal current shapes from the grid are evaluated using simulations and measurements. The results are compared to the basic three-phase single-switch-DCM-PFC-rectifier by an analysis of the harmonics, power-factors and THD-values from a low-voltage prototype with a resistive load. It turns out, that the disclosed new PFC-topology is a promising alternative to the Vienna-rectifier.