Constant Current/Voltage Charging for Primary-Side Controlled Wireless Charging System Without Using Dual-Side Communication

• Published in: IEEE transactions on power electronics Vol. 36; no. 12; pp. 13562 - 13577
• Main Authors: Li, Zhenjie, Liu, Hao, Tian, Yuhong, Liu, Yiqi
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.12.2021; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Coils; Communications systems; Compensation; Control methods; Control systems design; Controllability; Converters; Couplers; Electric potential; Inductance; Integrated auxiliary coil; Inverters; laminated magnetic coupler (LMC); Load resistance; Misalignment; Modules; no dual-side communication; Optical wavelength conversion; Phase shift; primary-side control; Receivers; Resistance; Stability; Topology; Voltage; Wireless communications; wireless power transfer; Wireless power transmission
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2021.3088272

To realize the misalignment insensitivity and stable constant current/voltage (CC/CV) charging without using the extra dc-dc converter, composite compensation topology, and wireless communication modules, a primary-side control method based on the phase-shift full-bridge inverter and the laminated magnetic coupler (LMC) is proposed for the wireless charging system. First, the load-independent output current and voltage characteristics for the series-series compensation are analyzed. The equations for estimating the charging current and voltage are deduced by only using the primary-side parameters. Second, the excellent antimisalignment capability of the LMC with the primary-side integrated auxiliary coil is verified. As a result, the influence of horizontal misalignment on the estimation precision is reduced; the controllability of the charging current is ensured. Third, the dual-loop cascade PI controller is designed, and CC/CV charging is realized by adjusting the phase-shift angle. Finally, both the simulation and experimental results show that the primary-side control method realizes CC/CV charging with high precision within the reasonable horizontal misalignment range. Compared to the conventional primary-side control methods, the proposed one avoids both the load resistance estimation and mutual inductance identification. Meanwhile, the compact and lightweight receiver module is ensured.