6.78 MHz loosely coupled inductive wireless power transfer with series–parallel resonators

Vinit Kumar; KangHyun Yi

6.78 MHz loosely coupled inductive wireless power transfer with series–parallel resonators

Vinit Kumar

KangHyun Yi

Vol. 23, No. 2, pp. 355-362, Feb. 2023

10.1007/s43236-022-00552-5

Magnetic resonance wireless power transfer

LC compensated half bridge inverter

Series–parallel resonator

S-parameters

Abstract

In a recent trend, near distance wireless power transfer (WPT) for low-power applications has increased exponentially. However, issues such as high harmonic content at the input side of the transmission coil and very low WPT efficiency are persistent. Therefore, a new magnetic resonance WPT (MRWPT) system has been proposed to overcome the aforementioned issues. This paper introduces an LC compensated half-bridge class-D inverter, which minimizes the harmonic content from the input source and makes the MOSFET of the inverter perform zero voltage switching. Simultaneously, a matching capacitor is connected between the resonant coil and the compensated inverter to suppress the reactive power loss. In addition, a series–parallel (SP) structured resonance coil has been introduced for low-power applications due to its high-efficiency WPT capability in near and mid-range distances. The introduced structure acts as a current source-transmitting resonator and a voltage source receiving resonator, which ensures the guaranteed resonance regardless of load variations. The performance of the proposed MRWPT system is analyzed using two-port scattering or S-parameter in the high-frequency structure simulation (HFSS) of ANSYS software. To validate the performance of the simulated system, an experimental 7 W setup has been designed to charge a mobile device.

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Cite this article

[IEEE Style]

V. Kumar and K. Yi, "6.78 MHz loosely coupled inductive wireless power transfer with series–parallel resonators," Journal of Power Electronics, vol. 23, no. 2, pp. 355-362, 2023. DOI: 10.1007/s43236-022-00552-5.

[ACM Style]

Vinit Kumar and KangHyun Yi. 2023. 6.78 MHz loosely coupled inductive wireless power transfer with series–parallel resonators. Journal of Power Electronics, 23, 2, (2023), 355-362. DOI: 10.1007/s43236-022-00552-5.