Improvement of Transmission Distance by Using Ferrite in Superconductive Wireless Power Transfer

Jeong, In-Sung; Lee, Yu-Kyeong; Choi, Hyo-Sang

doi:10.1007/s10948-016-3951-y

Cited by 6 publications

(1 citation statement)

References 4 publications

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“…Due to the low loss and large critical current density properties of high-temperature superconducting (HTS) materials, superconducting WPT systems with HTS coils have been found to be more efficient and have been considered as a potential charging tool for electric vehicles [14][15][16]. By introducing high-Q HTS electrode capacitors to form superconducting LC-resonators (consisting of an inductance and a capacitor), those systems can be improved further [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

A tunable superconducting LC-resonator with a variable superconducting electrode capacitor bank for application in wireless power transfer

He¹,

Wang²,

Yan³

2019

Supercond. Sci. Technol.

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The frequency alignment of resonators is essential for wireless power transfer (WPT) systems to achieve strongly coupled magnetic resonances. Here, we present a novel tunable superconducting resonator for WPT applications. The tunable resonator is composed of a high-temperature superconducting (HTS) coil and a variable HTS electrode capacitor bank based on two series YBa2C3O7−x–SrTiO3–YBa2C3O7−x thin films. The HTS coil serves as a wireless transmitting tool for power delivery, while the HTS electrode capacitor bank provides a frequency-tuning element for the resonator. At 77 K, the HTS materials cause low loss and thus achieve a high quality factor, while the incipient ferroelectric SrTiO3 substrate with HTS electrodes has a nonlinear capacitance dependence on the applied electric field with no hysteresis. A voltage supply applies a continuous DC bias to both capacitors synchronously via the coil, adjusting the total capacitance and thus the resonant frequency. Our results indicate that the tunable resonator can achieve a tuning range of 12% from 775 kHz, offering a frequency-tuning functionality to superconducting WPT technology.

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