Single-Phase Current Source Rectifier With Power Decoupling Using The X - Type CSC Topology

This work proposes a topology of X-Type Current Source Rectifier (X-type CSR) that helps to mitigate the effect of the double-the-line-frequency power ripple (low frequency) in the output of a single-phase rectifier. The low frequency ripple reduction allows to increase the converter power density by reducing the volume of the DC-bus inductor, without lack of stiffness at the DC-bus. The low frequency reduction is achieved by using a different single-phase CSR topology that uses the well known X-type CSC approach which allows reduction in conducting losses and independent control for two CSCs which share the same DC-bus and the middle switches of the leg. Details of topology, control strategy and modulation are presented. Simulation and experimental results for a 500W prototype are provided to validate the theoretical approach.