Research outputs

Wireless Power Transfer Technology

01

New PCB resonator structures for HP, HF and HE operation

5 papers

Research papers

  1. 01

    K. Li, J. Wu, S. C. Tan, K. W. E. Cheng and S.-Y. R. Hui, “Characterization and Modeling of Dual-Single-Layer PCB Resonators for Megahertz Hybrid Inductive and Capacitive Wireless Power Transfer,” IEEE Transactions on Power Electronics, vol. 40, no. 10, pp. 16004–16021, Oct. 2025.

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  2. 02

    K. Li, J. Wu, S. C. Tan and S. Y. R. Hui, “Design and Modelling of a Mega-Hertz PCB Resonator with Hybrid Inductive and Capacitive Wireless Power Transfer Capability,” 2024 IEEE Energy Conversion Congress and Exposition (ECCE), Phoenix, AZ, USA, pp. 7100–7104.

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  3. 03

    Y. Wang, K. Wang, K. Li, Y. Yang and S. Y. R. Hui, “Multi-MHz Inductive and Capacitive Power Transfer Systems With PCB-Based Self-Resonators,” IEEE Transactions on Power Electronics, vol. 39, no. 10, pp. 14077–14090, Oct. 2024.

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  4. 04

    J. Wu, K. Li, S. C. Tan and S. Y. R. Hui, “High-Frequency PCB Resonator Designs With Quality Factor Exceeding 1000,” 2024 IEEE Energy Conversion Congress and Exposition (ECCE), Phoenix, AZ, USA, pp. 6939–6943.

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  5. 05

    Y. Wang, K. Wang, K. Li, Y. Yang and S. Y. R. Hui, “Self-Resonant Capacitive Power Transfer System Leveraging Printed-Circuit-Board Coupler with Integrated Compensation Inductance,” 2024 IEEE Energy Conversion Congress and Exposition (ECCE), Phoenix, AZ, USA, pp. 2425–2429.

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02

HF gate drive for soft-switched power inverters

4 papers

Research papers

  1. 01

    M. Zhu, K. Li, S.-C. Tan and S. Y. R. Hui, “Electro-Thermal Circuit Modeling and Practical Evaluation of GaN Power Switches for Mega-Hertz Soft-Switching Operation,” IEEE Transactions on Power Electronics.

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  2. 02

    Y. Wang, Z. Sun, Y. Yang, C. Zhang and S. Y. R. Hui, “Challenges and Comparison in Achieving 6.78 MHz Multi-kW H-Bridge DC–AC Inverters Using High-Voltage SiC and GaN Switching Devices,” IEEE Transactions on Power Electronics, vol. 40, no. 11, pp. 17469–17487, Nov. 2025.

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  3. 03

    M. Zhu, K. Li, S. C. Tan and S. Y. R. Hui, “Enhancing Conversion Efficiency in Megahertz Wireless Power Transfer Systems with Schottky Freewheeling Diodes,” 2025 IEEE Wireless Power Technology Conference and Expo (WPTCE), Rome, Italy, pp. 1–5.

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  4. 04

    Y. Wang, K. Wang, Y. Yang and S. Y. Ron Hui, “Design, Implementation, and Comparison of Multi-MHz Multi-kW H-Bridge Inverters Based on 650V SiC and GaN Devices for High Frequency WPT,” 2024 IEEE Energy Conversion Congress and Exposition (ECCE), Phoenix, AZ, USA, pp. 2007–2012.

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03

Metasurface shields

1 paper1 patent

Research papers

  1. 01

    W. Chen, B. Xue, K. Li, S. Y. R. Hui and A. M. H. Wong, “Metasurface-Based Magnetic Field Shielding Technique in Wireless Power Transfer System,” 2025 International Conference on Microwave and Millimeter Wave Technology (ICMMT), Xi’an, China, pp. 1–3.

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Patents

  1. P01

    A. M. H. Wong, W. Chen and S. Y. R. Hui, “Magnetic Field Shield Comprising Multiple Frequency Selective Surfaces,” US Provisional Patent Application 63/896,261, City University of Hong Kong, Oct. 2025 (Filed).

04

System integration

9 papers3 patents

Research papers

  1. 01

    G. Zhu, J. Wu, S. C. Tan and S. Y. R. Hui, “Comprehensive Study of Detuning Effects in SS-Compensated Wireless Power Transfer Systems,” 2025 Zhejiang Power Electronics Conference (ZPEC), Hangzhou, China, pp. 525–530.

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  2. 02

    Y. Yang, J. Wu, S. C. Tan and S. Y. R. Hui, “Primary-Side Control With ZVS Angle and Input Power Regulation for Wireless Power Transfer Systems,” IEEE Transactions on Industrial Electronics.

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  3. 03

    J. Zhou, J. Wu, C. Q. Jiang, X. Wang, S. C. Tan and S.-Y. R. Hui, “Pulse Skipping Analysis in Wireless Power Transfer Systems Based on a Reduced-Order Model,” IEEE Transactions on Power Electronics.

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  4. 04

    J. Zhou, J. Wu, S. C. Tan and S. Y. R. Hui, “Seamless Zero-Phase Angle Operation in Wireless Power Transfer Systems Bridging Bifurcation and Non-Bifurcation Scenarios,” 2025 IEEE 15th International Conference on Power Electronics and Drive Systems (PEDS), Penang, Malaysia, pp. 1–5.

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  5. 05

    J. Zhou, J. Wu, Y. Yang, S. C. Tan and S. Y. R. Hui, “Self-Oscillating Wireless Battery Charging Systems With Locking Equilibrium Points,” IEEE Transactions on Power Electronics, vol. 41, no. 1, pp. 1367–1378, Jan. 2026.

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  6. 06

    J. Zeng et al., “A Fast Front-End Monitoring Method for Mutual Inductance and Load Movement in SS-Compensated Wireless Power Transfer Systems Based on Harmonics Extraction,” IEEE Transactions on Power Electronics, vol. 40, no. 1, pp. 2569–2580, Jan. 2025.

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  7. 07

    K. Li, H.-W. R. Liang, J. Zeng and S. Y. R. Hui, “A Dynamic Coupled Electro-Thermal Equivalent Circuit Model with Reversible Entropy Heat for Lithium-Ion Batteries,” IECON 2024 — 50th Annual Conference of the IEEE Industrial Electronics Society, Chicago, IL, USA, pp. 1–6.

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  8. 08

    J. Wu, H. Yuan, S. Li, S. C. Tan and S. Y. R. Hui, “A Novel Scheme with Maximum Efficiency and Fast Response for Dynamic Wireless Battery Charging Systems,” 2024 IEEE Energy Conversion Congress and Exposition (ECCE), Phoenix, AZ, USA, pp. 2067–2071.

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  9. 09

    Z. Sun, K. Wang, Y. Wang, Y. Yang, S. C. Tan and S. Y. R. Hui, “Unveiling the Essential Output Deviation Factors of Non-Ideal Inductive Power Transfer Systems with Self-Oscillating Control,” 2024 IEEE Energy Conversion Congress and Exposition (ECCE), Phoenix, AZ, USA, pp. 2169–2175.

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Patents

  1. P01

    R. S. Y. Hui and S. C. Tan, “A wireless charging system and docking station for mobile robots and light-weight electric vehicles,” US 63/772,308, City University of Hong Kong, Mar. 2025 (Filed).

  2. P02

    R. S. Y. Hui, J. Wu and S. C. Tan, “Method for Real-Time Estimation of the Instantaneous Open-Circuit Voltage and State-of-Charge of Re-Chargeable Batteries,” US Provisional Patent Application 63/781,049, City University of Hong Kong, Mar. 2025 (Filed).

  3. P03

    J. Wu, Y. Yang, S. C. Tan and S. Y. R. Hui, “Capacitor-Diode-Clamped Series-Compensated Resonant Circuit for Wireless Power Transfer,” US Provisional Patent Application 63/852,321, City University of Hong Kong, Jul. 2025 (Filed).

Smart Grid Technology

Research papers

  1. 01

    H. Yuan, B. Chaudhuri, S.-C. Tan and S. Y. R. Hui, “A Robust Synchronization Method for Enhancing Stability of IBR-Dominated Grids,” IEEE Transactions on Power Systems.

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