Modern battery electric vehicles (EVs) include a 400/800 V high-voltage network, mainly used for charging and motor drive purposes, and a 12/48 V low-voltage network, used to power all the low voltage loads in the vehicle. Current power conversion schemes use different power converters and architectures, leading to complex and costly implementations. On the one hand, on-board chargers (OBC) are used to provide fast and efficient charging when connected to the grid, whereas dc-dc power converters are required to provide a reliable low-voltage dc-network for ancillary loads. However, new trends on bidirectional power conversion and low-voltage battery elimination, as well as the need for cost-effective and high-power-density power conversion, require redesigned power conversion architectures. In this paper, an integrated solution based on a quadruple-port converter featuring a dc-transformer power conversion (QDCX) is proposed, achieving an integrated high-power density implementation for both on-board charging and low-voltage power distribution. The proposed topology is tested using a 11-kW 2x400-V OBC with 12-V low-voltage generation.
