An Optimized Coil Array and Passivity-Based Control for Receiving Side Multilevel Connected DC-DC Converter of Dynamic Wireless Charging

• Published in: IEEE transactions on vehicular technology Vol. 71; no. 4; pp. 3715 - 3726
• Main Authors: Liu, Jia, Liu, Zhitao, Chen, Wenjie, Sun, Xuhui, Su, Hongye
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.04.2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Arrays; Coils; Compensators; Couplers; Coupling; Couplings; Current sharing; DC-DC power converters; Dynamic wireless charging (DWC); Electric vehicles; electric vehicles (EVs); Finite element method; Inductors; multilevel connected DC–DC converter; Passivity; passivity-based control (PBC); Power generation; power pulsation; Pulsation; Receivers; Transmitters; Voltage converters (DC to DC); Wireless power transmission
• ISSN: 0018-9545; 1939-9359
• DOI: 10.1109/TVT.2022.3146636

Dynamic wireless charging (DWC) is one of the most promising and economical power supply solutions for electric vehicles (EVs), which can address range anxiety and downsize the volume of onboard batteries. To solve the null power phenomenon and transfer power pulsation phenomenon in DWC scheme, this paper proposes a new magnetic coupler array to implement continuous charging and reduce the output power variation. The transmitters are placed with a proper interval to eliminate the adjacent coupling and enlarge the coil array's effective length. ANSYS Maxwell is utilized to demonstrate the finite element analysis (FEA) of the DWC system. A larger receiver coil is designed to significantly mitigate power pulsation and increase the magnetic coupling as the receiver moves along the array. With the well-designed receiver coil, the output power pulsation is <inline-formula><tex-math notation="LaTeX">\pm</tex-math></inline-formula> 1.52<inline-formula><tex-math notation="LaTeX">\%</tex-math></inline-formula>. For the high-power capacity scenario, a multilevel connected DC-DC converter is designed on the receiver side to regulate the transfer power. Besides, a passivity-based control (PBC) is developed for the receiving DC-DC converter based on the Euler-Lagrange (EL) model, and a current sharing compensator is employed to balance each phase inductor current. Finally, a 500-<inline-formula><tex-math notation="LaTeX">\text{W}</tex-math></inline-formula> prototype is constructed, and experimental results are represented to validate the proposed optimized coil array and the proposed PBC method.