A Dual-Channel Magnetically Integrated EV Chargers Based on Double-Stator-Winding Permanent-Magnet Synchronous Machines

Abstract

In this paper, a dual-channel isolated magnetically integrated charger is proposed for electric vehicles (EVs). The key is to apply and operate two interleaved power charging channels, each of which is composed of one dual-active-bridge isolated converter and one voltage-source inverter. The proposed configuration not only offers electric isolation under charging operation but also provides modular design and operation for each power conversion channel. By integrating the grid inductances with the double-stator-winding permanent-magnet (PM) synchronous machine under charging operation, the volume and weight of the charging system are saved for EVs. By reconfiguration of power circuits, the proposed dual-channel magnetically integrated EV chargers can be used for both single-phase and three-phase charging operations. The mechanical vibration caused by interaction between grid currents and PM flux can be mitigated by using the dual-channel charging operation. The interleaved operation and the phase-shifted modulation have been proposed for the dual charging channels to offer low current ripple on battery side and better harmonic performance on grid side. Furthermore, chaotic modulation strategies have been proposed to reduce the distinct switching harmonics in spectrum, which will facilitate improving the conducted electromagnetic compatibility in EVs. The experiments have been carried out on a 1-kW laboratory prototype to verify the validity of the proposed schemes.