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Technical Lecture

Power Electronics for Hybrid and Electric Vehicles

T08.2 - A Novel Interleaving Method for High Power Integrated Electric Vehicle Charger with Three-Phase Permanent Magnet Synchronous Motor

Tuesday, March 18, 2025
8:50 AM – 9:10 AM ET
Location: Level Three, A314
The voltage of electric vehicle batteries has increased from the conventional 400 V-class to the 800 V-class, necessitating boost converters to charge 800 V-class batteries with 400 V-class chargers. To minimize the additional cost of this boost converter, integrated chargers utilizing a traction motor and inverter has been proposed. Interleaving strategies using three-phase windings or only two of the three phases have been suggested to sufficiently suppress the battery charging current ripple. However, challenges have arisen owing to the increased magnetic losses associated with interleaving and heightened root-mean-square current per phase caused by restricting conduction to two phases. These challenges lead to temperature rise in permanent magnet synchronous motors and limit the output and time for fast charging. This paper proposes a new interleaving method that utilizes three-phase windings while suppressing magnetic losses for high power charging with permanent magnet synchronous motor. Finite element analysis and experiments verify the effectiveness of the method.