Improved Power Quality On-Board Integrated Charger With Reduced Switching Stress

Abstract

There is a consistent demand for reliable, efficient, small-sized, and light weight on-board chargers for vehicular battery charging applications. In view of aforesaid requirements, these chargers are restricted to Level-1 and Level-2 charging. Therefore, it leads to larger charging time. The proposed charger is integrated with propulsion machine drive system that serves to utilize the high power-rated electrical machine and motor-drive voltage source converter to facilitate vehicular battery charging when the vehicle is not running. This article presents mathematical modeling under various operational modes, analysis, and design considerations for the proposed system configuration. The entire system is developed in sim-power system toolbox of MATLAB software and tested in real-time implementation. The performance investigations of proposed charging system are carried out for vehicle battery charging under steady state as well as source variations. Furthermore, to ensure power quality features, total harmonic distortions of source voltage, and current and input power factor, are monitored. The salient features of proposed systems include no additional circuit, on-board charger suitable for fast charging, plugged in with single-phase, 230-V, 50-Hz outlet. It also offers a reduction in switch stress, reduced filter size, less ripple in current and voltage, and also improves the dynamic response.