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Advances in Wireless Power Transfer

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A Special Issue of Electronics (ISSN 2079-9292) belonging to the section "Power Electronics".

Deadline for manuscript submissions: 20 November 2026 | Viewed by 3873

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Editors

Dr. Haocai Huang

E-Mail Website
Guest Editor

Ocean College, Zhejiang University, Zhoushan 316021, China
Interests: power electronics; wireless power transfer; autonomous underwater vehicles

Dr. Zheyuan Wu

E-Mail Website
Guest Editor

School of Automation and Intelligence Science, Jiangnan University, Wuxi 214122, China
Interests: robotics; advanced control; underwater vehicles
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Special Issue Information

Dear Colleagues,

Wireless Power Transfer (WPT) has emerged as a key enabling technology for next-generation intelligent systems, supporting the rapid development of electric vehicles, implantable medical devices, industrial automation, underwater robotics, and the Internet of Things (IoT). With the growing demand for high-power, long-distance, and high-efficiency wireless charging, innovative breakthroughs in system design, control algorithms, energy management, and electromagnetic compatibility are urgently required.

This Special Issue aims to showcase cutting-edge research contributions, novel theories, engineering solutions, and emerging applications in the field of wireless power transfer. We seek original research articles, reviews, and novel perspectives that advance both the fundamental understanding and practical deployment of WPT systems.

Topics of interest include, but are not limited to, the following:

Inductive, capacitive, and microwave- or laser-based WPT technologies;
High-efficiency coils, compensation topologies, and power converters;
Magnetic field optimization, EMI/EMC, safety, and standardization;
Dynamic, multi-receiver, or long-distance WPT systems;
WPT for IoT, electric transportation, biomedical devices, and underwater systems.

We warmly invite you to contribute to this Special Issue.

Dr. Haocai Huang
Dr. Zheyuan Wu
Guest Editors

Manuscript Submission Information

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

wireless power transfer (WPT)
high-frequency power electronics
dynamic wireless charging
intelligent power control
energy transmission for iot and robotics

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Published Papers (7 papers)

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Research

30 pages, 23294 KB

Open AccessArticle

Structure-Aware Design of a Partially Overlapped Segmented Transmitter with a Position-Dependent Excitation Strategy for Automotive Power-Seat Wireless Power Transfer Under Wide Misalignment

by Chang-Su Shin, Dong-Hee Kim and Geun Wan Koo

Electronics 2026, 15(16), 3756; https://doi.org/10.3390/electronics15163756 - 21 Aug 2026

Viewed by 281

Abstract

Wireless power transfer (WPT) can eliminate moving power-supply harnesses in automotive power-seat systems, but seat travel and nearby metallic structures cause substantial variations in magnetic coupling and electromagnetic loss. This paper proposes a structure-aware, partially overlapped segmented transmitter and evaluates two predefined excitation states according to receiver position. In the single-segment state, only the reference segment CP1 is energized; in the simultaneous dual-segment state, CP1 and the adjacent segment CP2 are energized together. Three-dimensional finite element method (FEM) simulations compare candidate transmitter structures and evaluate the electromagnetic influence of the aluminum lower rail, steel upper rail, and steel seat frame. The transmitter geometry is determined by considering mutual inductance, winding loss, structural eddy-current loss, and partial-overlap characteristics. A three-coil equivalent circuit clarifies the branch-current distribution, and a two-state switched-capacitor network accommodates the different equivalent transmitter impedances. A 100 W, 110 kHz prototype separately evaluates representative states at x = 0 and 80 mm; automatic position-based state switching is not implemented. At x = 0 mm, CP1-only excitation achieves 78.79% efficiency. At x = 80 mm, CP1 + CP2 excitation produces 32.13 V and 72.15%, compared with 18.78 V and 67.84% under CP1-only excitation, thereby satisfying the 30 V minimum output requirement. Full article

(This article belongs to the Special Issue Advances in Wireless Power Transfer)

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24 pages, 5887 KB

Open AccessArticle

Calibration-Based Primary-Side Identification of Coupling and Load Resistance for the Control of a Low-Power Wireless Charger Without Secondary-to-Primary Communication

by Víctor Hueros, Álvaro Pérez, Cristina Fernandez and Andrés Barrado

Electronics 2026, 15(14), 3159; https://doi.org/10.3390/electronics15143159 - 17 Jul 2026

Viewed by 355

Abstract

Wireless power transfer (WPT) technology offers reliability, safety, and ease of use for low-power charging applications. However, output regulation is difficult when the secondary side is inaccessible, because the magnetic coupling factor

k

and the equivalent load resistance

R_{L}

may both [...] Read more.

k

and the equivalent load resistance

R_{L}

may both be unknown and variable. This work addresses the two unknown parameters problem using only primary-side measurements of the DC-link voltage

V_{D C}

and the primary resonant current

I_{1}

. An initial calibration stage temporarily connects a known resistance on the receiver side, making it possible to estimate

k

without a secondary-to-primary communication link. Then, during the charging stage, the previously estimated coupling is used to estimate the equivalent load resistance and to indirectly regulate the charger input voltage through a primary-side pre-regulator. The proposed system is intended for low-power WPT chargers, in which the receiver side must be simple and compact. A resonant DC converter prototype was experimentally implemented using a Class-E inverter, a Series-Series compensation network, a full-bridge rectifier, primary-side voltage/current sensing, and a pre-regulator. The experimental results show a maximum coupling identification error of 3.9% and a maximum load-resistance identification error of 10.67%. The resulting output voltage is not measured directly at the load; instead, it is estimated from primary-side variables and maintained within the 4–6 V input window of the target charger around a 5 V reference, with a maximum relative voltage error of approximately 10%. The work therefore presents a primary-side identification and control proof of concept without secondary-to-primary communication, while explicitly discussing the calibration requirement, equivalent-load validation, efficiency limitations, and the conditions under which recalibration would be required. Full article

(This article belongs to the Special Issue Advances in Wireless Power Transfer)

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12 pages, 8172 KB

Open AccessArticle

Optimal Resonant Frequency Design of an SH Coil for Leakage Magnetic Field Reduction in LCC-S Wireless Power Transfer Systems

by Jaewoon Cho, Yujun Shin and Seongho Woo

Electronics 2026, 15(12), 2607; https://doi.org/10.3390/electronics15122607 - 12 Jun 2026

Viewed by 355

Abstract

This study presents a new analytical approach to determine the optimal resonant frequency of a shielding (SH) coil, effectively minimizing leakage magnetic fields in inductor-capacitor-capacitor-series (LCC-S) wireless power transfer (WPT) systems. This method mitigates leakage magnetic fields by integrating an SH coil into the transmitter side. By establishing an analytical relationship between the SH coil reactance and the system operating frequency, the proposed method determines the condition where the resultant current phasor produced by the transmitter (TX), receiver (RX), and SH coils becomes minimal, thereby identifying the optimal SH resonant frequency that achieves maximum destructive interference. The effectiveness of the proposed method was evaluated using simulation and measurement results, confirming a maximum leakage magnetic field reduction of 52.64% by applying the optimized SH coil resonant frequency. This study presents an analytical design approach that optimizes the SH coil resonant frequency to effectively cancel leakage magnetic fields. Full article

(This article belongs to the Special Issue Advances in Wireless Power Transfer)

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19 pages, 13844 KB

Open AccessFeature PaperArticle

Power-Matched Harmonic Current Analysis of a Detuned S–S Compensated Wireless Power Transfer System Across CCM and DCM Operation

by Seongho Woo and Yujun Shin

Electronics 2026, 15(12), 2520; https://doi.org/10.3390/electronics15122520 - 8 Jun 2026

Cited by 1 | Viewed by 421 | Correction

Abstract

This paper presents a power-matched third-harmonic current analysis for a detuned series–series (S–S) compensated wireless power transfer (WPT) system operating across continuous conduction mode (CCM) and discontinuous conduction mode (DCM). In practical S–S WPT systems, the transmitter-side resonant frequency is often intentionally detuned from the switching frequency to satisfy the desired switching condition, which leaves a residual transmitter reactance and changes the harmonic current behavior. In addition, the rectifier conduction mode affects the receiver-side voltage waveform and its harmonic components. To analyze this behavior, the fundamental power-transfer path is modeled using the equivalent rectifier input resistance, whereas the harmonic path is formulated using the inverter and rectifier harmonic voltage sources coupled through the transmitter and receiver resonant tanks. Although the formulation is applicable to arbitrary odd harmonics, the third-harmonic current is selected as the main EMI-oriented comparison quantity because it is the dominant low-order harmonic in the considered operating range. Simulation and experimental results show that output power alone is not sufficient to determine the harmonic current level. When power-matched operating points exist across the CCM/DCM boundary, the CCM-side load point is generally more favorable, especially from the receiver-side third-harmonic viewpoint. When both power-matched points are in DCM, the load point closer to the CCM/DCM boundary is generally more favorable than the deeper DCM point. Full article

(This article belongs to the Special Issue Advances in Wireless Power Transfer)

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17 pages, 432 KB

Open AccessArticle

Reusing Wireless Power Transfer for Backscatter-Assisted Pairwise Cooperation in Multi-User WPCNs

by Yuan Zheng, Fengxian Tang, Weiqiang Wu and Yongxue Wang

Electronics 2026, 15(10), 2227; https://doi.org/10.3390/electronics15102227 - 21 May 2026

Viewed by 366

Abstract

This paper studies a backscatter-assisted pairwise cooperation scheme in a multi-user wireless powered communication network (WPCN), where pairs of wireless devices (WDs) first harvest wireless energy from an energy node (EN) and then transmit their information to an access point (AP). Under the proposed scheme, the two WDs in each pair first exchange their local messages and then cooperatively transmit to the AP in the uplink. To reduce the time and energy consumption of local information exchange, we exploit the short distance between paired users and realize message exchange through energy-conserving backscatter communication. Meanwhile, the proposed design effectively reuses the wireless power transfer (WPT) signal to enable simultaneous information exchange during the energy harvesting phase, thereby leaving more time and harvested energy for the subsequent cooperative uplink transmission. Based on this transmission protocol, we jointly optimize the time allocation, the user transmit power allocation, and the energy beamforming matrix at the EN to maximize the weighted sum rate. To tackle the resulting non-convex problem, we decompose it into two coupled subproblems and develop an alternating optimization algorithm to update the corresponding variables iteratively. Numerical results show that the proposed scheme achieves significant weighted sum rate improvement over representative benchmark methods. Full article

(This article belongs to the Special Issue Advances in Wireless Power Transfer)

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20 pages, 6051 KB

Open AccessArticle

A Hybrid Dual-Frequency IPT Topology for Stable CC/CV Charging with Enhanced Misalignment Tolerance

by Zhiliang Yang, Yafei Chen, Junchen Xie and Dong-Hee Kim

Electronics 2026, 15(10), 2065; https://doi.org/10.3390/electronics15102065 - 12 May 2026

Viewed by 413

Abstract

Inductive power transfer (IPT) systems commonly rely on complex control schemes or hybrid compensation networks with bulky ferrite-core inductors to realize constant-current/constant-voltage (CC/CV) charging and misalignment tolerance, which degrades system integration and power density. This paper proposes a hybrid dual-frequency IPT topology using a fully capacitive compensation structure, eliminating the need for large inductors. The proposed topology is composed of S–S and S–LCC compensation networks, which are switched by a Single-Pole Double-Throw (SPDT) relay switch for CC/CV mode transition. Two inherent zero phase angle (ZPA) operating frequencies are generated for CC and CV modes, enabling mode transition through simple frequency switching and SPDT relay switch-based topology switching without additional DC–DC stages or complex control. A unified parameter design and a unipolar duty cycle (UDC) control strategy are developed to allow fixed-parameter operation with enhanced tolerance to coupling variation. Experimental results validate stable ZPA operation in both modes. A 3.7 kW prototype achieves a peak efficiency of 96.07%. Full article

(This article belongs to the Special Issue Advances in Wireless Power Transfer)

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17 pages, 2718 KB

Open AccessArticle

Dynamic Wireless Power Transfer System Without Receiving Coil Position Detection Sensors

by Daniels Lapickis, Deniss Stepins and Janis Zakis

Electronics 2026, 15(4), 756; https://doi.org/10.3390/electronics15040756 - 11 Feb 2026

Cited by 2 | Viewed by 953 | Correction

Abstract

The development of autonomous mobile robots or automated guided vehicles is consistently challenged by energy-storage constraints, and while batteries are the standard solution for mobile robots, dynamic wireless power transfer is an alternative way to supply power without reliance on chemical energy storage. For efficient dynamic wireless power transfer, transmitting coils should be energized as required, necessitating real-time position tracking of the receiving coil. Current prevalent techniques require complex modifications to existing systems and additional position sensors, which increase total costs. This article proposes a novel receiving coil position detection method for wireless power transfer systems without using external receiving coil position detection sensors and describes the application of the sensorless coil position detection method and its advantages compared to other methods. The proposed method was implemented on an existing low-power, miniaturized test bench. The described method was successfully validated and correctly switched transmitting coils, ensuring continuous movement of an electric vehicle, therefore proving its viability as a potential new approach for sensorless receiving-coil detection. Experimental results demonstrate that the prototype achieved a maximum power transfer efficiency of 53.8% while maintaining continuous transmitting coil switching operation at vehicle speeds up to 77 cm/s. Full article

(This article belongs to the Special Issue Advances in Wireless Power Transfer)

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