An Improved Threefold Interleaved PFC Circuit With Better Voltage Profile and Optimizing Current-Sharing Method

Abstract

In this article, a threefold interleaved power factor correction (PFC) circuit is proposed. The main purpose of this circuit is to reduce the output voltage and current ripples. This reduction in the value of the voltage and current ripples leads the output filter of the converter to have a smaller size. Furthermore, the proposed converter in this article can share the input current between the inductors equally. This reduces the inductor size and improves the total harmonic distortion. Also, the suggested converter creates a constant output voltage although the load is fluctuating. As well as this, the converter can last longer compared to the previous PFC converters, as the electrolyte capacitor will be removed from the converter circuit. This also reduces the maintenance costs since the electrolyte capacitor is the main source of failures in the converters. Instead of the electrolyte capacitor, this article uses the active capacitor, which is a promising way to decrease the capacitor size and maintain the output voltage. The proposed converter is simulated in MATLAB software, and simulation results validate the advantages of the proposed circuit, including equally shared input current between the input inductors, which leads to the robustness of the presented circuit. As well as this, the proposed circuit shows promising results on the output side, as it decreases the ripple of the output voltage and keeps the output voltage constant, while the load is changing.