New Printed-Circuit-Board Resonators With High Quality Factor and Transmission Efficiency for Mega-Hertz Wireless Power Transfer Applications

Article Automation & Control Systems

Quasi-Static Modeling and Optimization of Two-Layer PCB Resonators in Wireless Power Transfer Systems for 110-kV Power Grid Online Monitoring Equipment

Yaoran Fang et al.

Summary: This article presents a study on the power supplies for online monitoring systems in the transmission and distribution networks of the emerging smart grid. It proposes a method of harvesting and delivering magnetic energy around the transmission line wirelessly using PCB resonators embedded inside an insulation rod. The article derives a new model of the PCB resonators and constructs an automated simulation-driven optimization framework to enhance the quality factor of the resonator. Practical measurements show significant improvements in the wireless power transfer efficiency.

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS (2022)

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Article Engineering, Electrical & Electronic

A 6.6-kW High-Frequency Wireless Power Transfer System for Electric Vehicle Charging Using Multilayer Nonuniform Self-Resonant Coil at MHz

Ruiyang Qin et al.

Summary: This article proposes a high-power, high-frequency wireless power transfer system for electric vehicles (EVs) with lightweight and compact coil design. The system utilizes a multilayer nonuniform self-resonant coil to eliminate the need for external capacitors and mitigate high-frequency conduction loss. Experimental tests demonstrate 95.2% efficiency and 52.5 kW/m² power density with 6.6 kW power transferred across a 100-mm coil-to-coil distance. This system showcases the first 6.6-kW wireless power transfer system for EV charging using compact self-resonant coils at MHz frequency.

IEEE TRANSACTIONS ON POWER ELECTRONICS (2022)

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Article Engineering, Electrical & Electronic

Self-Resonant Antisymmetric Planar Coil for Compact Inductive Power Transfer System Avoiding Compensation Circuits

Zixuan Yi et al.

Summary: The APC IPT system utilizes symmetric planar coils to avoid compensation circuits, resulting in higher reliability and a compact configuration. Design guidelines for developing transmitting and receiving coils are derived based on the principles of maximum power transfer and maximum energy efficiency. Experimental validation demonstrates that the APC IPT system is a good candidate in wireless power transfer applications.

IEEE TRANSACTIONS ON POWER ELECTRONICS (2021)

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Article Engineering, Electrical & Electronic

High-Voltage Insulation Design of Coreless, Planar PCB Transformers for Multi-MHz Power Supplies

Ole Christian Spro et al.

Summary: This article investigates the insulation design for printed, planar, coreless, and high-frequency transformers, presents transformer models for an operating frequency of 6.78 MHz. The high frequency, coreless design and consideration of coupling capacitance in the design optimization ensure high transformer efficiency and offer multiple design solutions. Additionally, a concept for grading the electric field of PCB windings is proposed.

IEEE TRANSACTIONS ON POWER ELECTRONICS (2021)

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Article Engineering, Electrical & Electronic