scholarly journals Design of Wireless Power and Information Transfer Systems Considering Figure of Merit for Information

2020 ◽  
Vol 20 (4) ◽  
pp. 241-247
Author(s):  
Gunyoung Kim ◽  
Bomson Lee
Keyword(s):  
Information Transfer ◽  
Figure Of Merit ◽  
Near Field ◽  
Power Transfer ◽  
Wireless Power ◽  
Resonant Structures ◽  
Inductively Coupled ◽  
Electromagnetic Simulations ◽  
Power Transfer Efficiency ◽  
System Configurations

Inductively coupled resonant wireless power transfer (WPT) systems can be used as a wireless power and information transfer (WPIT) system by properly adding the function of varying Rx loads. A new metric for the figure of merit for information transfer from Rx to Tx is proposed as the ratio of Tx input impedances for the Rx shorted and optimum loads to systematically assess the information transfer. While most of WPT and near-field communication (NFC) devices have been adopted for very short distances between Tx and Rx, this work shows that the WPIT systems using inductively coupled resonant structures with high Q-factor coils enable much longer working distances with the best power transfer efficiency and information transfer capability. Several design examples show that the newly proposed figure of merit for information transfer is an essential metric in the understanding and design of WPIT systems. The theory is validated with circuit and electromagnetic simulations for various system configurations.

scholarly journals Near-Field Wireless Power and Data Transmission Through two-wire Power Carrier

2020 ◽  
Vol 9 (9) ◽  
pp. 463-467
Keyword(s):  
Magnetic Induction ◽  
Power Efficiency ◽  
Information Transfer ◽  
Near Field ◽  
Mode Switching ◽  
Receiver Design ◽  
Power Transfer ◽  
Wireless Power ◽  
Induction Principle ◽  
Power Transfer Efficiency

These days wireless power transfer is the widely used technology to transmit power and information simultaneously. In this paper, the magnetic induction principle is used to transfer power and information simultaneously through a single winding arrangement. It is shown that a 7W LED lamp can be illuminated between a distance of about 5mm. Magnetic induction principle can be applied to a short-range power and information transfer only. This paper discusses the underwater LED light luminaire transmitter and receiver design components, along with it shows the mode switching of LED. The power transfer efficiency is about 65% when the transmitter and receiver are placed in-line and power efficiency decreases with the displacement of the lamp to either side.

scholarly journals Wireless power transfer through metal using inductive link

2019 ◽  
Vol 10 (4) ◽  
pp. 1906
Author(s):  
Tuan Anh Vu ◽  
Chi Van Pham ◽  
Anh-Vu Pham ◽  
Christopher S. Gardner
Keyword(s):  
Power Transfer ◽  
Wireless Power ◽  
Inductively Coupled ◽  
Stroke Width ◽  
Measurement Results ◽  
Power Transfer Efficiency ◽  
Collector Efficiency ◽  
Helical Coils ◽  
Efficient Power ◽  
Class E

<span style="color: #000000; font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 10px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">This paper presents a highly efficient power transfer system based on a co-design of a class-E power amplifier (PA) and a pair of inductively coupled Helical coils for through-metal-wall power transfer. Power is transferred wirelessly through a 3.1-mm thick aluminum barrier without any physical penetration and contact. Measurement results show that the class-E PA achieves a peak power gain of 25.2 dB and a maximum collector efficiency of 57.3%, all at 200 Hz. The proposed system obtains a maximum power transfer efficiency of 9% and it can deliver 5 W power to the receiver side through the aluminum barrier.</span>

scholarly journals Numerical Study of Non-Radiating Near-Field Wireless Power Transfer System

2021 ◽  
Vol 2015 (1) ◽  
pp. 012170
Author(s):  
E Zanganeh ◽  
M Song ◽  
M Korobkov ◽  
A Evlyukhin ◽  
A Miroshnichenko ◽  
...  
Keyword(s):  
Magnetic Dipole ◽  
Near Field ◽  
Wireless Power Transfer ◽  
Transfer Efficiency ◽  
Transfer System ◽  
Dipole Mode ◽  
Power Transfer ◽  
Wireless Power ◽  
Power Transfer Efficiency ◽  
Wireless Power Transfer System

Abstract The main challenge in near-field wireless power transfer systems is the increase of power transfer efficiency. It can be achieved by reducing ohmic or radiation losses of the resonators included in the system. In this paper, we propose and investigate numerically a non-radiating near-field wireless power transfer system based on transmitter and receiver implemented as dielectric disk resonators. The transmitter and receiver geometrical parameters are numerically optimized to operate at the frequency of non-radiating state of high refractive index dielectric resonators instead of magnetic dipole mode. Under the non-radiating state, we determine the frequency with almost zero radiation to the far-field. We numerically study the wireless power transfer efficiency as a function of operation distance between the transmitter and receiver and demonstrate that the higher efficiency compared to magnetic dipole mode can be achieved at non-radiating state for a fixed distance due to suppression of the radiation loss.

scholarly journals A multimode metamaterial for a compact and robust dualband wireless power transfer system

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Xin Jiang ◽  
Ramesh K. Pokharel ◽  
Adel Barakat ◽  
Kuniaki Yoshitomi
Keyword(s):  
Figure Of Merit ◽  
Near Field ◽  
Wireless Power Transfer ◽  
Dual Band ◽  
Portable Devices ◽  
Power Transfer ◽  
Wireless Power ◽  
Lower Mode ◽  
Previous State ◽  
Wireless Power Transfer System

AbstractTo release more flexibility for users to charge their portable devices, researchers have increasingly developed compact wireless power transfer (WPT) systems in recent years. Also, a dual-band WPT system is proposed to transfer power and signal simultaneously, enriching the system’s functionality. Moreover, a stacked metasurface has recently been proposed for a single band near-field WPT system. In this study, a novel multimode self-resonance-enhanced wideband metasurface is proposed for a robust dual-band WPT system, which significantly improves the performance of both bands. The size of the transmitter (Tx) and the receiver (Rx) are both 15 mm × 15 mm only. The proposed metasurface can improve efficiency from 0.04 up to 39% in the best case. The measured figure of merit (FoM) is 2.09 at 390 MHz and 2.16 at 770 MHz, respectively, in the balanced mode. Especially, the FoM can reach up to 4.34 in the lower mode. Compared to the previous state-of-the-art for similar applications, the WPT performance has significantly been improved.

scholarly journals Investigation of Improved Methods in Power Transfer Efficiency for Radiating Near-Field Wireless Power Transfer

2016 ◽  
Vol 2016 ◽  
pp. 1-11
Author(s):  
Hesheng Cheng ◽  
Huakun Zhang
Keyword(s):  
Phase Difference ◽  
Near Field ◽  
Wireless Power Transfer ◽  
Transfer Efficiency ◽  
Power Transfer ◽  
Wireless Power ◽  
Power Sources ◽  
Electrically Small Antenna ◽  
Power Transfer Efficiency ◽  
Feeding Sources

A metamaterial-inspired efficient electrically small antenna is proposed, firstly. And then several improving power transfer efficiency (PTE) methods for wireless power transfer (WPT) systems composed of the proposed antenna in the radiating near-field region are investigated. Method one is using a proposed antenna as a power retriever. This WPT system consisted of three proposed antennas: a transmitter, a receiver, and a retriever. The system is fed by only one power source. At a fixed distance from receiver to transmitter, the distance between the transmitter and the retriever is turned to maximize power transfer from the transmitter to the receiver. Method two is using two proposed antennas as transmitters and one antenna as receiver. The receiver is placed between the two transmitters. In this system, two power sources are used to feed the two transmitters, respectively. By adjusting the phase difference between the two feeding sources, the maximum PTE can be obtained at the optimal phase difference. Using the same configuration as method two, method three, where the maximum PTE can be increased by regulating the voltage (or power) ratio of the two feeding sources, is proposed. In addition, we combine the proposed methods to construct another two schemes, which improve the PTE at different extent than classical WPT system.

scholarly journals Inductive coupling for wireless power transfer and near-field communication

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Christoph Degen
Keyword(s):  
Signal Analysis ◽  
Data Transfer ◽  
Near Field ◽  
Magnetic Coupling ◽  
Wireless Power Transfer ◽  
Power Transfer ◽  
Wireless Power ◽  
Coupling System ◽  
Load Calculation ◽  
Power Transfer Efficiency

AbstractThis paper gives an overview of optimizing wireless power transfer systems using magnetic coupling. Optimization aims to maximize either the power transfer efficiency or the transferred power. The resulting load calculation and matching strategies are revisited. Moreover, the coupling system is described, starting with its equivalent circuit and scattering parameters. In addition to wireless power transfer, communication in RFID and NFC systems and its frequency characteristics and bandwidth issues are highlighted. The focus in this paper is on load modulation for data transfer between a tag and reader. For this purpose, subcarrier voltages are derived using time-domain as well as frequency-domain signal analysis.

scholarly journals Maximizing Transfer Efficiency with an Adaptive Wireless Power Transfer System for Variable Load Applications

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1417
Author(s):  
Jung-Hoon Cho ◽  
Byoung-Hee Lee ◽  
Young-Joon Kim
Keyword(s):  
Loading Condition ◽  
Wireless Power Transfer ◽  
Input Voltage ◽  
Transfer Efficiency ◽  
Maximum Efficiency ◽  
Variable Load ◽  
Power Transfer ◽  
Wireless Power ◽  
Variable Loading ◽  
Power Transfer Efficiency

Electronic devices usually operate in a variable loading condition and the power transfer efficiency of the accompanying wireless power transfer (WPT) method should be optimizable to a variable load. In this paper, a reconfigurable WPT technique is introduced to maximize power transfer efficiency in a weakly coupled, variable load wireless power transfer application. A series-series two-coil wireless power network with resonators at a frequency of 150 kHz is presented and, under a variable loading condition, a shunt capacitor element is added to compensate for a maximum efficiency state. The series capacitance element of the secondary resonator is tuned to form a resonance at 150 kHz for maximum power transfer. All the capacitive elements for the secondary resonators are equipped with reconfigurability. Regardless of the load resistance, this proposed approach is able to achieve maximum efficiency with constant power delivery and the power present at the load is only dependent on the input voltage at a fixed operating frequency. A comprehensive circuit model, calculation and experiment is presented to show that optimized power transfer efficiency can be met. A 50 W WPT demonstration is established to verify the effectiveness of this proposed approach.

Sign in / Sign up

Export Citation Format

Share Document