Differential-Power-Processing On-Board-Charger for 400/800-V Battery Architectures using 650-V Super Junction MOSFETs
Héctor Sarnago, Óscar Lucía, Rafael Pérez‐Jiménez, Pablo Gaona
Abstract
Electric vehicle technology is advancing towards higher power density and cost-effective systems to power future vehicles. On-board chargers are essential building blocks managing the battery status and are quickly evolving towards new power ratings and battery technologies. Modern trends include the design of higher power and higher battery voltage systems for improved power density and recharge times. These systems are migrating from existing 400-V batteries to optimized systems based on 800-V architectures. In this context, higher voltage devices and new topologies are required for optimized performance, efficiency and higher voltage operation.In this context, this paper proposes a cost-effective on-board charger architecture taking advantage of differential power processing to achieve high efficiency and power density. The proposed topology is based in a tandem configuration to optimize power processing and to enable the use of cost-effective 650-V silicon super junction MOSFETs. The proposed topology has been designed, implemented and tested in a 3,6 kW on-board charger configuration, proving the feasibility of this proposal.