Improved Power Quality Charger Based on Bridgeless Canonical Switching Cell Converter for a Light Electric Vehicle

An enhanced supply side performance based cost effective, efficient, and reliable charger for light electric vehicles (LEVs), is demonstrated in this work. On one side, the bridgeless canonical switching cell (BL-CSC) power factor corrected (PFC) converter excellently satisfies the grid side requirements; whereas, the flyback converter on another side ensures ripple (twice the line frequency ripples) free charging of the LEVs under different charging modes. Notably, the outstanding input current ripple characteristic of the BL-CSC converter reduces the switch stress and filter size. Furthermore, the discontinuous conduction mode (DCM) operation of the charger adds extra benefits such as the optimized size of magnetic components, minimum need of sensing devices, minuscule possibility of flyback transformer saturation, and zero current switching (ZCS) of all semiconductor devices. Moreover, the bridgeless configuration at supply end improves the overall device count, which further reduces the cost and corresponding losses in the charger. Performance validation of the presented charger is carried in laboratory environment through a test-bench prototype. Further, the steady-state performance analysis, behavior during various dynamics like supply voltage dynamics, and DC link voltage dynamics, are tested and relevant results are presented for performance verification. Finally, a comparative analysis of the charger with other existing topologies is carried out to justify its advantages over other chargers.