Design of Magnetic Structure for Omnidirectional Wireless Power Transfer

Cha, Hwa-Rang; Park, Kwang-Rock; Kim, Tae-Jin; Kim, Rae-Young

doi:10.1109/tpel.2021.3055863

Cited by 6 publications

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the Rx angular misalignment has been a significant challenge for a planar Tx structure when the energies flow in one direction. In [7], a cubic transmitter was proposed for an omnidirectional WPT. Meanwhile, in [8], the authors optimized a magnetic structure was to obtain a uniform power distribution and improve the PTE.…”

Section: Introductionmentioning

confidence: 99%

Dual-Band Free-Positioning Transmitting Coil for Multiple-Receiver Wireless Power Transfer

Le-Huu

Seo

2021

IEEE Access

View full text Add to dashboard Buy / Rent full text

In recent years, the requirement for a compact wireless power transfer (WPT) system that can supply power to multiple devices in various practical usage scenarios has been attracted many researchers. The receiver (Rx) misalignment problem is contributory to the power transfer efficiency (PTE) degradation. Moreover, in a multiple-output WPT system, the overall system efficiency is also affected by cross-coupling between receivers. This paper proposes a dual-band free-positioning transmitting coil (FPDB-Tx) for multiple-receiver WPT. A three-dimensional Tx structure is modeled by investigating the current direction on each coil loop to adapt the Rx angular and axial misalignment. The Tx configuration is designed following a wireless charging box concept, where multiple Rx devices can receive energy freely without a null efficiency point. The mutual inductance is examined by a mathematical method in various Rx orientations to verify the free-positioning characteristic. Furthermore, an equivalent circuit model of the WPT system is theoretically analyzed to obtain dual operating frequency bands and then maximized the PTE. The experimental results show that the proposed WPT system achieves a stable PTE in various Rx positions. Especially, the WPT system has a maximum PTE of 97.27% and 91% at 6.78 MHz and 13.56MHz, respectively.INDEX TERMS wireless power transfer, free-positioning WPT, multiple-receiver WPT, dual-band WPT, mutual coupling, impedance matching network.

show abstract

Section: Introductionmentioning

confidence: 99%