Modular Wireless Power Transfer Systems for Charging Stations Based on a Common AC Bus With LCC Compensation

The traditional arrangement to charge multiple electric vehicles (EVs) in an EV wireless charging station is to share a common dc bus for multiple inverters. To charge EVs with different power levels, the charging modules should be designed to be different, which will increase the cost and complexity. A modular design approach for a wireless charging station with a common ac bus is proposed in this article. All the charging modules are paralleled on the ac side of the inverters through transformers, and each charging module can be designed to be the same and fully utilized through the proposed arrangement. A voltage regulation strategy based on the active rectifier is proposed. The output voltage and power can be adjusted through the control strategy. An experimental prototype with two modules and three charging ports is built and the operations with different output ports are carried out. The proposed system can charge multiple EVs, and the charging voltage of each port can be adjusted independently through the proposed control strategy.