高频无线电力传输技术特刊主编寄语

Wireless power transfer (WPT) technology is becoming increasingly pivotal in a multitude of emerging applications, including transportation electrification, grids, consumer electronics, medical, and space. Its noncontact nature renders it advantages in challenging environmental conditions such as in environments that are dirty or ultraclean, high temperature, underwater, underground, and outer space. The performance of current WPT systems is intricately linked to the switching frequency along with the degree of coupling the volt-amps required from both the primary and secondary magnetics and the quality of these components. Altogether, these are critical determinants of power capacity, power density, and efficiency. Most articles on high-frequency WPT do not consider the industrialization demands of this technology such as mass production and operational concerns to fit standardization and focus instead on individual resonators tuned for laboratory validation. To improve the operational safety and reliability of WPT technologies, the importance of suppressing and eliminating electromagnetic interference (EMI) and electromotive force (EMF) problems caused by high-frequency magnetic fields is essential for the uptake of this technology. New magnetic coupler designs suited to each emerging industrial application are urgently required with a special focus on misalignment tolerance and transfer distance enhancement. Through comprehensive theoretical and mathematical modeling, a closer insight into the electromagnetic fundamentals of WPT systems will assist effective control strategies to be developed to achieve highly efficient power transfer at higher operation frequencies. This special issue actively solicited cutting-edge research contributions focused on high-frequency WPT technology across a broad spectrum of power levels, by means of high-frequency resonant converter design, electromagnetic field confinement and emission reduction, misalignment and transfer distance enhancement, modeling, and control of high-frequency WPT systems. This paradigm shift calls for more advanced technologies in the design, optimization, modeling, analysis, control, and implementation of high-frequency WPT technology. We received 74 submissions from various countries/regions to this special issue of IEEE Journal of Emerging and Selected Topics in Power Electronics (JESTPE), and after peer review, 31 of the submissions were finally accepted and included—making this one of the most popular special issues in IEEE JESTPE over the past two years. The accepted articles can be categorized into four sections under the corresponding topics including: 1) high-frequency resonant converter technology; 2) high-frequency electromagnetic field confinement and emission reduction; 3) misalignment and transfer distance enhancement in high-frequency WPT; and 4) modeling and control of high-frequency WPT systems. SECTION A. High-Frequency Resonant Converter Technology The high-frequency resonant converter is a critical component to ensure an efficient and controllable high-power WPT system. This topic includes four articles that discuss the resonant converter technology in high-frequency WPT systems by adopting new converter designs and system parameter optimization. In [A1], general principles of designing and optimizing a multi-MHz inductive power transfer (IPT) system to achieve high-power transfer efficiency are presented. In [A2], a study on the key challenges in designing and implementing SiC full-bridge inverters for high-efficiency multi-MHz multi-kW WPT systems is presented. Zhou et al. [A3] introduce a single-output and multiport receiver high-frequency WPT system, achieving stable power delivery for rotating power shaft structures. Nikiforidis et al. [A4] present a novel three-phase high-frequency IPT system to transfer power via multiple power conversion stages with the optimized design of parallel Class-E inverter cells, a Class DE rectifier, and a three-phase voltage source inverter. SECTION B. High-Frequency Electromagnetic Field Confinement and Emission Reduction High-frequency electromagnetic field confinement and emission reduction play a key role in limiting the spatial leakage magnetic flux and electromagnetic compatibility (EMC), both critical for industrialization, while improving the operating safety of WPT systems. Nine articles are included in this topic. In [A5], a cost-effective magnetic coupler is proposed for high-frequency WPT systems to enhance the horizontal magnetic flux utilization and maximize the mutual flux linkage. In [A6], a large-scale 3-D spatial transmitting structure based on cubic transmitting coils and active relay coils is proposed for WPT systems with multiple loads, which modulates the spatial magnetic field distribution and enhances the magnetic flux utilization. In [A7], the high-frequency loop current and harmonics in dual-sided coils are suppressed to improve the power transfer efficiency by using a segmented S–S compensation network with differential mode inductors. In [A8], a dual-mode metallic object detection method with the time-division multiplexing mode and the frequency-swept resonance mode is proposed for WPT systems operating at MHz frequencies. In [A9], a symmetrical planar spiral receiving coil is proposed for large-space WPT applications at MHz frequencies, which reduces parasitic capacitance effects and E-field exposure by employing multiple symmetrically wound spiral wires. In [A10], EMI and EMF in WPT systems are minimized and suppressed by adding additional phase delay with the optimized resonant tank design and adding extra higher order harmonic LC filters. Wang et al. [A11] propose a magnetic coupler with a flux pipe power supply rail and H-type receiver for dynamic WPT, which not only provides a uniform spatial magnetic field distribution but also reduces the output power fluctuation. In [A12], a magnetic coupler with an integrated compensation coil on the transmitting side and a quadruple-D coil on the receiving side is proposed to enhance system interoperability and misalignment tolerance of LCC-S-compensated WPT systems. In [A13], a near-field electromagnetic energy flow regulation method is presented to enhance the dual-side coupling and achieve stable power output by utilizing the distributed coupling characteristic parameters in a near-field WPT system. SECTION C. Misalignment and Transfer Distance Enhancement in High-Frequency WPT Misalignment tolerance and transfer distance enhancement in high-frequency WPT systems can significantly improve their corresponding reliability, transfer efficiency, and application potential. Ten articles have contributed to this topic. In [A14], a cylindrical solenoid coupler with a discrete ferrite bridge and multitap self-coupling coil is proposed to achieve stable and adaptive meter-range bidirectional dual modes. In [A15], a multi-to-one ultrasonic power transfer system is proposed to improve the misalignment tolerance of underwater WPT applications. In [A16], a rotation-resilient WPT system is introduced for autonomous underwater vehicles (AUVs) charging, which adopts a multiwinding solenoid transmitter coil to enhance its axial antimisalignment capability. In [A17], a height-adjustable WPT system is proposed based on a multirelay coil design, which can transfer power to receivers in a perpendicular position to the transmitter. In [A18], a rotational WPT system based on an optimized multilayer disk coil and an input-series-output-parallel hybrid topology is introduced for powering rotational equipment. Song et al. [A19] present a multitransmitter-based high-distance-diameter ratio WPT system design method to achieve efficient long-distance power transfer by adjusting the current distribution in each transmitter. In [A20], a reconfigurable 3-D coil structure is proposed to generate a locally omnidirectional magnetic field and achieve limited omnidirectional WPT with expanded effective charging space. In [A21], a position offset tolerance design scheme considering coil self- and mutual-inductance variations in IPT systems is introduced to achieve constant current (CC) outputs with zero voltage switching (ZVS) and minimum conduction loss. In [A22], a multiple-current amplitude modulation method is introduced to achieve 3-D antimisalignment power transfer, which determines the optimal current combinations for various transmission distances by a surrogate-based optimization framework. Wang et al. [A23] present a new discrete solenoid magnetic coupler for generating a uniform spatial electromagnetic field, which reduces transfer efficiency fluctuations and improves the misalignment tolerance of an underwater WPT system. SECTION D. Modeling and Control of High-Frequency WPT Systems Modeling methods and control strategies for high-frequency WPT systems improve the understanding of electromagnetic characteristics and enhance system power transfer efficiency and reliability. Eight articles have contributed to this topic. In [A24], a new time-domain-analysis model is proposed for the output current of an LCC–LCC-compensated IPT system. In [A25], a mutual-inductance identification method is introduced to achieve cross-coupling compensation for two-receiver WPT systems. In [A26], a dual-frequency dual-type-output (DT-DTO) WPT system is proposed. By superposing an adjustable sinusoidal signal on the control signal of the DT-DTO converter, simultaneous and individually adjustable charging for multiple loads is achieved. Wang et al. [A27] propose an extended phasor analysis approach and a control strategy for multiport wireless power router systems, which is capable of processing multiway bidirectional power flow. In [A28], a control method for pulsewidth modulation (PWM)-controlled switched capacitors is proposed to compensate the cross-coupling among multiple receivers in WPT systems, thus mitigating the output power deviation and increasing the overall system efficiency. In [A29], a joint mutual-inductance identification method combining a support vector regression-based data-driven model and an equivalent circuit model is proposed to accurately identify different conditions of system mutual coupling and load variations. In [A30], a parameter identification and output voltage/current control method for implementing CC/constant voltage (CV) battery charging in an LCC-S WPT system is proposed, which adopts the phasor estimation of the primary-side EMF and requires no real-time communication. In [A31], a negative resistance structure and a high-order compensation topology are designed for increasing the output power and transfer efficiency of a parity time-symmetric magnetic coupling WPT system. The editorial team hopes that this IEEE JESTPE special issue will provide readers with new insights that will encourage them to make further progress on this topic of high-frequency WPT. We believe that in the long term, such extensive research in this challenging field will significantly facilitate innovation and accelerate industrial utilization. We would like to thank the authors for their valuable contributions and the reviewers who have voluntarily provided constructive and timely feedback. Moreover, we want to thank the following guest associated editors for their help with this special issue (in no particular order): Paul Mitcheson (Imperial College London, London, U.K.); Silvano Cruciani (University of Rome, Rome, Italy); Patrick Hu (The University of Auckland, Auckland, New Zealand); Hua Zhang (Rowan University, Glassboro, NJ, USA); Khurram Afridi (Cornell University, Ithaca, NY, USA); Ming Liu (Shanghai Jiao Tong University, Shanghai, China); Zhichao Luo (South China University of Technology, Guangzhou, China); Lei Gu (University of Pennsylvania, Philadelphia, PA, USA); Mauro Feliziani (University of L’Aquila, L’Aquila, Italy); Yijie Wang (Harbin Institute of Technology, Harbin, China); Daniela Touma (University of South Alabama, Mobile, AL, USA); Jianwei Mai (Harbin Institute of Technology); Xiaohui Qu (Southeast University, Nanjing, China). Finally, we would like to express our gratitude to Dr. Fernando Briz, Editor-in-Chief, and Dr. Tsorng-Juu Liang, Co-Editor-in-Chief, for their guidance during the review process and assistance with the preparation of this special issue. Appendix: Related Articles L. Gu, V. Gao, A. Yang, T. Chen, and J. Rivas-Davila, “Design considerations for multi-megahertz resonant inductive power transfer,” IEEE J. Emerg. Sel. Topics Power Electron., vol. 13, no. 4, pp. 4336–4347, Aug. 2025, doi: 10.1109/JESTPE.2025.3527396. Y. Wang, S. Zhao, F. Lu, and H. Zhang, “Challenges in zero-voltage-switched-on multi-MHz multi-kW SiC full-bridge inverter and oriented design for high-power capacitive power transfer system,” IEEE J. Emerg. Sel. Topics Power Electron., vol. 13, no. 4, pp. 4256–4277, Aug. 2025, doi: 10.1109/JESTPE.2024.3525259. W. Zhou et al., “A secondary-side rotating and segmented capacitive power transfer system with low output voltage fluctuations based on three DC busbars,” IEEE J. Emerg. 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Xu, “A segmented parallel S/S compensation topology and its harmonic suppression method for IPT system,” IEEE J. Emerg. Sel. Topics Power Electron., vol. 13, no. 4, pp. 4315–4325, Aug. 2025, doi: 10.1109/JESTPE.2025.3526637. Z. Yang, C. Xia, A. Sun, S. Zhao, and Y. Cao, “Bivariate detection based dual-mode metal object detection system for wireless EV charging,” IEEE J. Emerg. Sel. Topics Power Electron., vol. 13, no. 4, pp. 4029–4044, Aug. 2025, doi: 10.1109/JESTPE.2024.3452186. T. Li et al., “Design and optimization of a perfectly symmetric planar spiral receiving coil with low E-field exposure for large-space WPT,” IEEE J. Emerg. Sel. Topics Power Electron., vol. 13, no. 4, pp. 4086–4097, Aug. 2025, doi: 10.1109/JESTPE.2024.3471657. S. Woo, Y. Shin, J. Rhee, S. Huh, and S. Ahn, “Design of resonant circuit components to suppress both EMF and EMI in wireless power transfer systems for electric vehicles,” IEEE J. Emerg. Sel. 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Liang et al., “Design and analysis of a height-adjustable multi-relay wireless power transfer system for desktop charging,” IEEE J. Emerg. Sel. Topics Power Electron., vol. 13, no. 4, pp. 3998–4018, Aug. 2025, doi: 10.1109/JESTPE.2024.3421344. L. Ji, M. Zhang, H. Sun, J. Li, and A. P. Hu, “Design and optimization of rotational hybrid WPT system with constant voltage output,” IEEE J. Emerg. Sel. Topics Power Electron., vol. 13, no. 4, pp. 4019–4028, Aug. 2025, doi: 10.1109/JESTPE.2024.3431559. B. Song et al., “Design of WPT system with high distance-diameter ratio based on multiple transmitting coil structure,” IEEE J. Emerg. Sel. Topics Power Electron., vol. 13, no. 4, pp. 4348–4357, Aug. 2025, doi: 10.1109/JESTPE.2025.3537179. Y. Li, H. Wang, Y. Zhai, L. Zhu, B. Yuan, and X. Li, “High degree of freedom limited omnidirectional wireless power transfer and reconfigurable method,” IEEE J. Emerg. Sel. 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