Grid-Connected Integrated Battery Chargers in Vehicle Applications: Review and New Solution

TLDR

In vehicle grid‑powered battery charging, traction circuit components are idle, allowing their use in an integrated charger that may be galvanically isolated or non‑isolated. The paper proposes a novel isolated high‑power three‑phase battery charger using a split‑phase permanent‑magnet motor. The authors review isolated and nonisolated integrated charger designs and describe a new split‑phase permanent‑magnet motor configuration for the charger. The proposed charger operates bidirectionally with unity power factor and high efficiency.

Abstract

For vehicles using grid power to charge the battery, traction circuit components are not engaged during the charging time, so there is a possibility to use them in the charger circuit to have an onboard integrated charger. The battery charger can be galvanically isolated or nonisolated from the grid. Different examples of isolated or nonisolated integrated chargers are reviewed and explained. Moreover, a novel isolated-high-power three-phase battery charger based on a split-phase permanent-magnet motor and its winding configuration is presented in this paper. The proposed charger is a bidirectional high-power charger with a unity power factor operation capability that has high efficiency.