Independent Charging Control Method for Dual-Channel Electric-Drive-Reutilized Onboard Charger

The dual-channel electric drives feature a highly modular design, which significantly enhances fault tolerance and reliability of electric vehicles. The dual-channel electric-drive-reutilized onboard chargers (EDROCs) not only inherit several advantages from dual-channel electric drives, but also have benefits in terms of cost, weight, and power density. However, the charging powers of the two batteries are closely related to each other, posing a challenge for charging both batteries at the same time with the optimal charging powers. In this article, an independent charging control method is proposed for the dual-channel EDROC integrated asymmetric six-phase permanent magnet synchronous machine, which is applicable to both balanced and unbalanced battery voltage states. Under two fundamental charging requirements, namely grid current balance and zero average charging torque, the dual-channel winding current expressions which are solely associated with the ratio between the amplitudes of dual-channel winding currents are first derived. Then, the relationship between the ratio and dual-channel charging powers is deduced to realize the independent charging control of two channels. Thereafter, the independent charging control method of the studied dual-channel EDROC is designed. Ultimately, the experimental results based on a preliminary test setup validate the proposed independent charging control method.