scholarly journals ACHIEVING THE CONSTANT OUTPUT POWER AND TRANSFER EFFICIENCY OF A MAGNETIC COUPLING RESONANCEWIRELESS POWER TRANSFER SYSTEM BASED ON THE MAGNETIC FIELD SUPERPOSITION PRINCIPLE

2019 ◽  
Vol 81 ◽  
pp. 127-136
Author(s):  
Suqi Liu ◽  
Jianping Tan ◽  
Yuping Liu
Keyword(s):  
Magnetic Field ◽  
Output Power ◽  
Superposition Principle ◽  
Magnetic Coupling ◽  
Transfer Efficiency ◽  
Transfer System ◽  
Power Transfer ◽  
Constant Output ◽  
The Magnetic Field

scholarly journals Circuit Model and Analysis of Multi-Load Wireless Power Transfer System Based on Parity-Time Symmetry

Energies ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 3260 ◽  
Author(s):  
Chengxin Luo ◽  
Dongyuan Qiu ◽  
Manhao Lin ◽  
Bo Zhang
Keyword(s):  
Output Power ◽  
Coupling Coefficient ◽  
Power Distribution ◽  
Wireless Power Transfer ◽  
Circuit Model ◽  
Transfer Efficiency ◽  
Power Transfer ◽  
Wireless Power ◽  
Time Symmetry ◽  
Constant Output

In the multi-load wireless power transfer (WPT) system, the output power and transfer efficiency will drop significantly with the change of distance between transmitter and receiver. Power distribution among multiple loads is also a major challenge. In order to solve these problems, a novel multi-load WPT system based on parity–time symmetry (PT-WPT) is proposed in this paper. Firstly, the multi-load PT-WPT system is modeled based on the circuit model. Then, the transmission characteristics of the multi-load PT-WPT system are analyzed. It is found that constant output power with constant transfer efficiency can be maintained against the variation of coupling coefficient, and the power distribution relationship among loads is only related to the coupling coefficient. Further, power distribution under different coupling situations is analyzed in detail to meet different power demands. Finally, taking a dual-load PT-WPT system as an example, the system parameters are designed and the circuit simulation is carried out. The simulation results are consistent with the theoretical analysis, which shows that PT symmetry can be applied to the multi-load WPT system to achieve constant output power, constant transfer efficiency, and power distribution simultaneously.

Using uniform magnetic field to obtain the constant output power and transfer efficiency for MCR-WPT

Circuit World ◽  
2019 ◽  
Vol 46 (1) ◽  
pp. 42-47
Author(s):  
Suqi Liu ◽  
Jianping Tan
Keyword(s):  
Magnetic Field ◽  
Output Power ◽  
Uniform Magnetic Field ◽  
Open Space ◽  
Frequency Mode ◽  
Transfer Efficiency ◽  
Fixed Frequency ◽  
Constant Frequency ◽  
Content Type ◽  
Constant Output

Purpose This paper aims to find an approach that achieves constant output power and transfer efficiency in an open space, such as charging pads. Design/methodology/approach In this study, a topology of the five-coil system including two transmitting coils is presented. Also, in a fixed-frequency mode and an open space, this study focuses on the two transmitting coils to achieve the uniform magnetic field and ultimately, attain the constant output power and transfer efficiency. Findings In a fixed-frequency mode and an open space, the constant output power and transfer efficiency is then achieved in experiments by inserting the relay loop into the uniform magnetic field. Practical implications An approach that achieves constant output power and transfer efficiency in an open space. The topology of the five-coil magnetically coupled resonant-wireless power transfer (MCR-WPT) system shows prospective value for various applications, which could be used at designing of wireless battery charger dedicated for cars or mobile phones. Originality/value By comparing the simulation and experimental results, the topology can be optimized in the transmission performance by itself. By doing so, the constant output power and transfer ef?ciency are achieved in the constant frequency mode.

scholarly journals Shielding the magnetic field of wireless power transfer system using zero-permeability metamaterial

2019 ◽  
Vol 2019 (16) ◽  
pp. 1812-1815 ◽  
Author(s):  
Conghui Lu ◽  
Xiutao Huang ◽  
Cancan Rong ◽  
Zhaoyang Hu ◽  
Junfeng Chen ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Wireless Power Transfer ◽  
Transfer System ◽  
Power Transfer ◽  
Wireless Power ◽  
Wireless Power Transfer System ◽  
The Magnetic Field

scholarly journals Wireless Power Transfer Using Double DD Coils

Electronics ◽  
2021 ◽  
Vol 10 (20) ◽  
pp. 2528
Author(s):  
Nataša Prosen ◽  
Jure Domajnko ◽  
Miro Milanovič
Keyword(s):  
Magnetic Field ◽  
Wireless Power Transfer ◽  
Transfer System ◽  
Power Transfer ◽  
Wireless Power ◽  
Novel Structure ◽  
Higher Power ◽  
Wireless Power Transfer System ◽  
The Magnetic Field

This paper deals with a wireless power transfer system where a novel structure of transmitting/receiving double DD coils is applied. This system uses two identical double D (DD) transmitter coils stacked on each other to transfer power to two stacked receiver coils. The power is transmitted simultaneously and independently through both transmitter coils to the receiving coils. The magnetic field of the first coil does not interfere with the second coil. Both transmitter and receiver coils are placed on each other and occupy the same footprint, so there is no need for increased space. This can lead to an interesting wireless power transfer system—from single load to double the load and higher power transfer density.

scholarly journals A Defected Metasurface for Field-Localizing Wireless Power Transfer

2021 ◽  
Author(s):  
Sarawuth Chaimool ◽  
Chawalit Rakluea ◽  
Yan Zhao ◽  
Prayoot Akkaraekthalin
Keyword(s):  
Magnetic Field ◽  
Electromotive Force ◽  
Wireless Power Transfer ◽  
Unit Cell ◽  
Transfer Efficiency ◽  
Two Dimensional ◽  
Power Transfer ◽  
Wireless Power ◽  
Commercial Applications ◽  
The Magnetic Field

The potential of wireless power transfer (WPT) has attracted considerable interest for various research and commercial applications for home and industry. Two important topics including transfer efficiency and electromotive force (EMF) leakage are concerned with modern WPT systems. This work presents the defected metasurface for localized WPT to prevent the transfer efficiency degraded by tuning the resonance of only one-unit cell at the certain metasurface (MTS). Localization cavities on the metasurface can be formed in a defected metasurface, thus fields can be confined to the region around a small receiver, which enhances the transfer efficiency and reduces leakage of electromagnetic fields. To create a cavity in MTS, a defected unit cell at the receiving coils’ positions for enhancing the efficiency will be designed, aiming to confine the magnetic field. Results show that the peak efficiency of 1.9% for the case of the free space is improved to 60% when the proposed defected metasurface is applied, which corresponds to 31.2 times enhancements. Therefore, the defected MTS can control the wave propagation in two-dimensional of WPT system.

scholarly journals Magnetic Coupler Optimization for Inductive Power Transfer System of Unmanned Aerial Vehicles

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7024
Author(s):  
Xiaokun Li ◽  
Junwei Lu ◽  
Sascha Stegen
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Output Power ◽  
Magnetic Coupling ◽  
Power Transfer ◽  
Inductive Power Transfer ◽  
Experimental Platform ◽  
Aerial Vehicles ◽  
Spiral Coils ◽  
The Magnetic Field ◽  
Inductive Power

Unmanned aerial vehicles (UAVs) have been widely used in military and civilian applications. However, the insufficient cruising range restricts the development of UAVs due to the limitation of their battery. Inductive power transfer (IPT) is an effective way to charge the battery and solve this problem. Magnetic coupler is a key component of the IPT system, which greatly affects the power transfer and efficiency of the IPT. This paper proposes a new magnetic coupler with vertical spiral coils and ferrite PQI cores for the IPT system of UAVs, which can enhance the magnetic coupling and improve the performance of the IPT system. Finite element simulations are used to investigate the magnetic field distribution and coupling capability of the proposed magnetic coupler. In addition, an experimental platform is built to prove the validity of the IPT system using the proposed magnetic coupler. The results show that the coupling coefficient can reach 0.98, and the system transfer efficiency is 89.27% with an output power of 93 W. The IPT system also has a perfect misalignment tolerance and can achieve a stable output power.

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