Abstract
In this paper, a mid-range wireless power transfer (WPT) system based on metamaterials (MMs) has been presented. It has been shown that the MMs are positioned in the WPT system to focalize the electromagnetic field for distance enhancement and efficiency improvement theoretically and experimentally. The MMs were fabricated by using a single layer printed-circuit board (PCB) with the negative magnetic permeability, μr. An applicable impedancetuning technology was implemented by changing the operating distance between the drive (load) resonator and the internal resonator, which can achieve the optimal load of the system. In addition, the Class-E RF (radio frequency) power amplifier is firstly proposed as the high frequency excitation source of the WPT system based on the MMs due to its simple design and high efficiency. The proposed technology can achieve efficiency improvements of 4.26% and 9.13% at distances of 100 cm and 200 cm around the 2.80 MHz WPT system with the MMs, respectively. Specially, it is worth mentioning that the system efficiency is enhanced by 18.58% at 160 cm. The measured results indicate the WPT system based on the MMs can assure a stable output power of 5W at a transfer distance of 200 cm.
Highlights
Wireless power transfer (WPT) via magnetic resonance coupling has extensive application prospects in people’s daily lives, such as electrical vehicle charging, home application, portable electronic devices, and robotic applications [1,2,3,4]
We firstly extended original research of the four-coil WPT system to elucidate a number of crucial system concepts, including the maximum power efficiency and the optimal load
The mid-range WPT system based on the metamaterials using the Class-E amplifier was analyzed
Summary
Wireless power transfer (WPT) via magnetic resonance coupling has extensive application prospects in people’s daily lives, such as electrical vehicle charging, home application, portable electronic devices, and robotic applications [1,2,3,4]. Pinuela et al [9] manifested that the system de-to-load efficiency based on the two-coil inductive mode can be improved greatly by using a Class-E power amplifier, and the system employed high Q factor coils operating at about 6 MHz. Reference [10,11,12] employed the physics of the magneto-inductive wave method to explain the behavior of the WPT system with several planar printed resonators in which each capacitive loaded resonator was coupled magnetically to a series of other resonators. S21 parameter) to describe the transfer efficiency by the network analyzer experimentally, rather than practical system energy efficiency, let alone using the Class-E power amplifier as a high frequency source to drive the whole WPT system with the MMs. In this paper, we adopt the four-coil WPT system based on magnetically coupled resonance with the MMs in the near field. This technology can make the power grid much smarter by supplying high voltage power pole tower on-line monitoring terminal devices
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
