— Overview
Wired charging already exists, the material says, but wireless charging is attractive for ease of use. In electric vehicles, though, the pads have to line up more carefully than in many other wireless systems, and the misalignment can be larger. That error affects the coupling coefficient of the compensation circuit, shifts the resonant frequency, changes output-voltage control, and can lower the system’s efficiency.
An aluminum shield on the receive pad can make those electrical-parameter changes worse. The study is a literature review, and it treats inductive resonant coupling as the most workable option for high-power EV wireless charging. It also stresses cutting parasitic resistance in the circuit if high efficiency is to be kept. Among the papers it reviews is Bok Young-han’s 2023 master’s thesis at Myongji University, on a 22 kW wireless charging system.
In that study, efficiency reached 94.76 percent when the transmit and receive pads were aligned at the (0.0) position, and stayed between 92.8 and 94.72 percent at other mismatched positions. The thesis is read as support for an inductive power-transfer system with an LCL filter and an LCC-CCL structure, built around a three-phase two-leg power-factor corrector. Those efficiencies belong to the 2023 thesis; they are not a later official standard or a commercial deployment figure.
Oh Seung-dae’s 2023 thesis on an optimal design for a double-sided LCC compensation circuit is also listed among the reviews. The aim, as the material puts it, is to ease the alignment problem so that wireless charging can be convenient and efficient for drivers. Later official standards are outside the scope of this page.
— Contents and key concepts
Pads that have to line up
Wired charging already exists, the material says, but wireless charging is attractive for ease of use. In electric vehicles, though, the pads have to line up more carefully than in many other wireless systems, and the misalignment can be larger. That error affects the coupling coefficient of the compensation circuit, shifts the resonant frequency, changes output-voltage control, and can lower the system’s efficiency. An aluminum shield on the receive pad can make those electrical-parameter changes worse.
The study is a literature review, and it treats inductive resonant coupling as the most workable option for high-power EV wireless charging. It also stresses cutting parasitic resistance in the circuit if high efficiency is to be kept.
A 22 kW result in 2023
Among the papers it reviews is Bok Young-han’s 2023 master’s thesis at Myongji University, on a 22 kW wireless charging system. In that study, efficiency reached 94.76 percent when the transmit and receive pads were aligned at the (0.0) position, and stayed between 92.8 and 94.72 percent at other mismatched positions. The thesis is read as support for an inductive power-transfer system with an LCL filter and an LCC-CCL structure. Those efficiencies belong to the 2023 thesis; they are not a later official standard. Oh Seung-dae’s 2023 thesis on a double-sided LCC compensation circuit is also listed.
The aim, as the material puts it, is to ease the alignment problem so that wireless charging can be convenient and efficient for drivers. The same Korean report, at fuller length, is on CampusDown.
Sources
- EV wireless charging: pad alignment is stricter than in many other wireless systems; misalignment changes coupling and resonant frequency, can lower efficiency; an aluminum shield on the receive pad can worsen parameter changes. Literature review; inductive resonant coupling treated as the most workable high-power option; parasitic resistance should be cut. Bok Young-han, 2023, Myongji University master’s thesis, 22 kW system: 94.76% efficiency at aligned (0.0) pads; 92.8–94.72% at mismatched positions; LCL filter and LCC-CCL, three-phase two-leg PFC. Figures belong to the 2023 thesis, not a later official standard. Oh Seung-dae, 2023, double-sided LCC compensation circuit, also listed.
Last updated: 14 November 2026
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