scholarly journals Optimization of CC-Coil Design for Wireless Power Transfer System with Series-Series Magnetic Resonance Compensation Technique

2021 ◽  
Vol 2 (2) ◽  
Author(s):  
Muhammad Muhaimin Mohd Taib ◽  
◽  
Asmarashid Ponniran ◽  
Keyword(s):  
Magnetic Resonance ◽  
Output Power ◽  
Coupling Coefficient ◽  
Wireless Power Transfer ◽  
Power Transfer ◽  
Coil Design ◽  
Wireless Power ◽  
Transfer Distance ◽  
Power Transfer Efficiency ◽  
Compensation Technique

This study aims to increase the coupling coefficient of the coils and power transfer efficiency (PTE) of the wireless power transfer (WPT) system. WPT system has a severe issue with the PTE as the transfer distance between the transmitter and receiver increases. Therefore, the transmitter and receiver of the single-circular coil (CC-coil) need to be optimized in geometry to maintain high coupling at an optimum distance. Ferrite and aluminum shielding are also crucial on CC-coil optimization. Implementing the series-series (S-S) magnetic resonance compensation technique can increase the PTE of the WPT system. Therefore, the CC-coil is optimized using Ansys Electronics Desktop and co-simulated with the magnetic resonance circuit using Ansys Twin Builder. The results show that the CC-coils' coupling coefficient increased by 21.38% with the shielding implementation. The maximum optimum transfer distance of 37 mm for horizontal misalignment and 30 mm for vertical misalignment. Implementing the S-S magnetic resonance compensation technique can improve the PTE and output power of the WPT system. The power transmitted also varied with the transfer distance, which caused the system's variation of input impedance. Hence, it is essential to consider the coil design and compensation circuit to achieve high PTE and output power at a higher transfer distance.

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.

scholarly journals Optimization of the Coupling Coefficient of the Inductive Link for Wireless Power Transfer to Biomedical Implants

2022 ◽  
Vol 2022 ◽  
pp. 1-12
Author(s):  
Jiarui Bao ◽  
Shuyan Hu ◽  
Zibin Xie ◽  
Guangxi Hu ◽  
Ye Lu ◽  
...  
Keyword(s):  
Coupling Coefficient ◽  
Wireless Power Transfer ◽  
The Body ◽  
Power Transfer ◽  
Wireless Power ◽  
Implantable Medical Devices ◽  
Inductive Link ◽  
High Frequency Structure Simulator ◽  
Power Transfer Efficiency ◽  
Air Muscle

This work focuses on the optimization of coupling coefficient (k) of the inductive link for the wireless power transfer (WPT) system to be used in implantable medical devices (IMDs) of centimeter size. The analytic expression of k is presented. Simulations are conducted by using the high-frequency structure simulator (HFSS). Analytic results are verified with simulations. The receiving (Rx) coil is implanted in the body and set as a circular coil with a radius of 5 millimeters for reducing the risk of tissue inflammation. The inductive link under misalignment scenarios is optimized to improve k. When the distance between the transmitting (Tx) and Rx coils is fixed at 20 mm, it is found that, to maximize k, the Tx coil in a planar spiral configuration with an average radius of 20 mm is preferred, and the Rx coil in a solenoid configuration with a wire pitch of 0.7 mm is recommended. Based on these optimization results, an inductive link WPT system is proposed; the coupling coefficient k, the power transfer efficiency (PTE), and the maximum power delivered to the load (MPDL) of the system are obtained with both simulation and experiment. Different media of air, muscle, and bone separating the Tx and Rx coils are tested. For the muscle (bone) medium, PTE is 44.14% (43.07%) and MPDL is 145.38 mW (128.13 mW), respectively.

Optimal Range of Coupling Coefficient of Loosely Coupled Transformer Considering System Resistance

2021 ◽  
Vol 35 (11) ◽  
pp. 1368-1369
Author(s):  
Jiawei Ge ◽  
Hassan Eldeeb ◽  
Kun Liu ◽  
Jinping Kang ◽  
Haisen Zhao ◽  
...  
Keyword(s):  
Output Power ◽  
Coupling Coefficient ◽  
Wireless Power Transfer ◽  
Transfer System ◽  
Power Transfer ◽  
Wireless Power ◽  
Optimal Range ◽  
Loosely Coupled ◽  
System A ◽  
Wireless Power Transfer System

Accurate system resistance may lead to an obvious error between the simulated and the real efficiency of the system. This paper proposes an optimal range of coupling coefficient for ensuring the efficiency and the sufficient output power of the WPT (wireless power transfer) system. A 3-kW prototype WPT system is manufactured and the effectiveness of the optimal range of coupling coefficient is validated.

scholarly journals Analysis and Design of Asymmetric Mid-Range Wireless Power Transfer System with Metamaterials

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1348
Author(s):  
Yingqin Zeng ◽  
Conghui Lu ◽  
Cancan Rong ◽  
Xiong Tao ◽  
Xiaobo Liu ◽  
...  
Keyword(s):  
Printed Circuit Board ◽  
Power Transmission ◽  
Magnetic Coupling ◽  
Wireless Power Transfer ◽  
Circuit Board ◽  
Power Transfer ◽  
Wireless Power ◽  
Analysis And Design ◽  
Transfer Distance ◽  
Power Transfer Efficiency

In a wireless power transfer (WPT) system, the power transfer efficiency (PTE) decreases sharply with the increase in transfer distance. Metamaterials (MMs) have shown great potential to enhance PTE in mid-range WPT systems. In this paper, we propose two MM slabs of a 3 × 3 array to enhance the magnetic coupling. The MM unit cell was designed by using square spiral patterns on a thin printed circuit board (PCB). Moreover, the asymmetric four-coil WPT system was designed and built based on the practical application scenario of wireless charging for unmanned devices. The simulation and experimental results show that two MM slabs can enhance power transmission capability better than one MM slab. By optimizing the position and spacing of two MM slabs, the PTE was significantly improved at a mid-range distance. The measured PTEs of a system with two MM slabs can reach 72.05%, 64.33% and 49.63% at transfer distances of 80, 100 and 120 cm. When the transfer distance is 100 cm, the PTE of a system with MMs is 33.83% higher than that without MMs. Furthermore, the receiving and load coils were integrated, and the effect of coil offset on PTE was studied.

scholarly journals Coupling Independent Operation in Wireless Power Transfer System without Ferrite Usage

2021 ◽  
Vol 1 (2) ◽  
Author(s):  
Nattapong Hatchavanich ◽  
Sumate Naetiladdanon ◽  
Anawach Sangswang ◽  
Mongkol Konghirun
Keyword(s):  
Output Power ◽  
Magnetic Coupling ◽  
Wireless Power Transfer ◽  
Constant Current ◽  
Operating Frequency ◽  
Power Transfer ◽  
Wireless Power ◽  
Current Series ◽  
Power Transfer Efficiency ◽  
Primary Current

The power transfer efficiency and output power of a wireless power transfer (WPT) system are mainly affected by magnetic coupling between the primary and secondary coils. This paper presents a constant-current series-series compensated WPT system. Based on the bifurcation criteria, kcri and Lcri, the splitting zero phase angle (ZPA) frequencies is adopted as the operating frequency. The proposed system remains fully compensated even under coupling variations, and without ferrite. The current and voltage gains at the operating frequency can be estimated through the primary current and voltage. A phase-locked loop circuit is used to track the corresponding ZPA frequency due to the coil positioning variations. Experimental results have shown that the 1-kW of output power with the satisfied efficiency of 96%.

Rollable metamaterial screen for magnetic resonance coupling-based high-efficiency wireless power transfer

2020 ◽  
pp. 1-9
Author(s):  
Woosol Lee ◽  
Yong-Kyu Yoon
Keyword(s):  
Magnetic Resonance ◽  
High Efficiency ◽  
Wireless Power Transfer ◽  
Network Analyzer ◽  
Power Transfer ◽  
Wireless Power ◽  
Magnetic Resonance Coupling ◽  
Power Transfer Efficiency ◽  
Resonance Coupling ◽  
The Magnetic Field

Abstract This paper presents a rollable metamaterial screen for high-efficiency wireless power transfer (WPT) system based on magnetic resonance coupling, which operates at 4.5 MHz. The rollable metamaterial screen with a fully expanded area of 750 mm × 750 mm is located in the middle between transmitter and receiver coils and focuses the magnetic field and, by such a way, significantly improves power transfer efficiency (PTE). The metamaterial screen can be rolled up, e.g. onto the ceiling when it is not used, and thus does not require any designated space for the screen saving space. A WPT system with the rollable metamaterial screen is designed, fabricated, and characterized. Improved PTE is qualitatively and quantitatively verified by light bulb experiments and vector network analyzer measurements. The PTE of the WPT system with the metamaterial screen increases from 36 to 58.52% and 10.24 to 31.36% for the distances between the transmitter and receiver coils 100 and 150 cm, respectively. The effects of lateral and angular misalignments on the PTE of the WPT system are also studied. Obtained results show that the rollable metamaterial screen improves the PTE even at the misaligned condition.

scholarly journals Magnetic resonance coupling for 5G WPT applications

2019 ◽  
Vol 8 (3) ◽  
pp. 1036-1046
Author(s):  
Saidatul Izyanie Kamarudin ◽  
A. Ismail ◽  
A. Sali ◽  
M. Y. Ahmad
Keyword(s):  
Magnetic Resonance ◽  
Wireless Power Transfer ◽  
Wave Band ◽  
Power Transfer ◽  
Wireless Power ◽  
Magnetic Resonance Coupling ◽  
Power Transfer Efficiency ◽  
Resonance Coupling ◽  
Oxide Substrate ◽  
Institute Of Technology

Inductive Wireless Power Transfer (IWPT) is the most popular and common technology for the resonance coupling power transfer. However, in 2007 it has experimentally demonstrated by a research group from Massachusets Institute of Technology (MIT) that WPT can be improved by using Magnetic Resonance Coupling Wireless Power Transfer (MRC WPT) in terms of the coupling distance and efficiency. Furthermore, by exploiting the unused, high-frequency mm-wave band which are ranging from 3~300 GHz frequency band, the next 5G generations of wireless networks will be able to support a higher number of devices with the increasing data rate, higher energy efficiency and also compatible with the previous technology. In this work, a square planar inductor with the dimension of 6.1 x 6.1 mm is designed, and the resonators have the same self-resonance frequency at 14 GHz. The coil resonators have been laid on Silicon and Oxide substrate to reduce the loss in the design. From the CST software simulation and the analytical model in MATLAB software, it has been shown that the MRC WPT design has improved the performance of IWPT design by 40% power transfer efficiency. MRC WPT design also has larger H-Field value which is 705.5 A/m, as compared to the IWPT design which has only 285.6 A/m when both Transmitter(Tx) and Reciever(RX) is at 0.3 mm coupling distance.

scholarly journals Analysis of Fundamental Differences between Capacitive and Inductive Impedance Matching for Inductive Wireless Power Transfer

Electronics ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 476 ◽  
Author(s):  
Yelzhas Zhaksylyk ◽  
Einar Halvorsen ◽  
Ulrik Hanke ◽  
Mehdi Azadmehr
Keyword(s):  
Magnetic Resonance ◽  
Impedance Matching ◽  
Perfect Match ◽  
Wireless Power Transfer ◽  
Transfer Efficiency ◽  
Power Transfer ◽  
Wireless Power ◽  
Power Transfer Efficiency ◽  
Parameter Ranges ◽  
Smith Chart

Inductive and capacitive impedance matching are two different techniques optimizing power transfer in magnetic resonance inductive wireless power transfer. Under ideal conditions, i.e., unrestricted parameter ranges and no loss, both approaches can provide the perfect match. Comparing these two techniques under non-ideal conditions, to explore fundamental differences in their performance, is a challenging task as the two techniques are fundamentally different in operation. In this paper, we accomplish such a comparison by determining matchable impedances achievable by these networks and visualizing them as regions of a Smith chart. The analysis is performed over realistic constraints on parameters of three different application cases both with and without loss accounted for. While the analysis confirms that it is possible to achieve unit power transfer efficiency with both approaches in the lossless case, we find that the impedance regions where this is possible, as visualized in the Smith chart, differ between the two approaches and between the applications. Furthermore, an analysis of the lossy case shows that the degradation of the power transfer efficiencies upon introduction of parasitic losses is similar for the two methods.

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