Characteristic Research on Wireless Power Transfer Based on Magnetic Coupling Resonant

2014 ◽  
Vol 687-691 ◽  
pp. 3379-3382
Author(s):  
Shui Xiang Cui ◽  
Zhi Juan Zhang ◽  
Xue Mei Liang
Keyword(s):  
Theoretical Analysis ◽  
Power Transmission ◽  
Magnetic Coupling ◽  
Load Resistance ◽  
Transmission Efficiency ◽  
Wireless Power ◽  
Load Power ◽  
Transmission Distance ◽  
Working Principle ◽  
Coil Size

This paper analyses the working principle of magnetic coupling resonant wireless power transmission system based on mutual inductance coil model, and then gets the expressions of load power and transmission efficiency. By the theoretical analysis the relations between the various system parameters such as: coil size, transmission distance, load resistance, the resonant frequency and load power, transmission efficiency are obtained. According to the results of theoretical analysis, the system’s characteristics of load power and transmission efficiency with varying transmission distance are studied. Finally, simulations verify the accuracy of analysis by Matlab/Simulink.

Compensating Resonant Frequency via Adjusting Adjustable Coil Automatically

2019 ◽  
Vol 12 (5) ◽  
pp. 432-438
Author(s):  
Jin Xu ◽  
Yuting Zhao
Keyword(s):  
Resonant Frequency ◽  
Power Transmission ◽  
Reference Value ◽  
Transmission Efficiency ◽  
Theoretical Research ◽  
Future Research ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Resonant Coupling ◽  
Transmission Distance

Background: Detuning is the main problem that affects the efficiency and transmission distance of the resonant coupling Wireless Power Transmission (WPT). The distance of load and the offset of the load position could cause serious detuning. Methods: This paper presents an adjustable coil in which inductance can be adjusted. Then a model of WPT was established that could compensate resonant frequency automatically using the adjustable coil. Next, the relationship between the primary resonant frequency and the transmission efficiency is analyzed from the circuit. The analysis proved that the design of the adjustable coil could improve the transmission efficiency of the WPT system. Finally, a prototype of WPT system was built. Results: The experimental results showed that WPT system with adjustable coil can improve the transmission efficiency which proves the theoretical research. At the same time, it has essential reference value for the future research of WPT. Conclusion: In this paper, aiming at the system detuning caused by some other factors, such as the position shift of the load during the wireless power transmission, an adjustable coil is proposed.

scholarly journals Comparison of the Efficiency and Load Power in Periodic Wireless Power Transfer Systems with Circular and Square Planar Coils

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4975
Author(s):  
Jacek Maciej Stankiewicz ◽  
Agnieszka Choroszucho
Keyword(s):  
Power Transmission ◽  
Wireless Power Transfer ◽  
Load Resistance ◽  
Numerical Approach ◽  
Maximum Efficiency ◽  
Power Transfer ◽  
Wireless Power ◽  
Load Power ◽  
Coil Geometry ◽  
Square Planar

In the article, a wireless charging system with the use of periodically arranged planar coils is presented. The efficiency of two wireless power transfer (WPT) systems with different types of inductors, i.e., circular and square planar coils is compared, and two models are proposed: analytical and numerical. With the appropriate selection of a load resistance, it is possible to obtain either the maximum efficiency or the maximum power of a receiver. Therefore, the system is analyzed at two optimum modes of operation: with the maximum possible efficiency and with the highest power transmitted to the load. The analysis of many variants of the proposed wireless power transfer solution was performed. The aim was to check the influence of the geometry of the coils and their type (circular or square) on the efficiency of the system. Changes in the number of turns, the distance between the coils (transmit and receive) as well as frequency are also taken into account. The results obtained from analytical and numerical analysis were consistent; thus, the correctness of the adopted circuit and numerical model (with periodic boundary conditions) was confirmed. The proposed circuit model and the presented numerical approach allow for a quick estimate of the electrical parameters of the wireless power transmission system. The proposed system can be used to charge many receivers, e.g., electrical cars on a parking or several electronic devices. Based on the results, it was found that the square coils provide lower load power and efficiency than compared to circular coils in the entire frequency range and regardless of the analyzed geometry variants. The results and discussion of the multivariate analysis allow for a better understanding of the influence of the coil geometry on the charging effectiveness. They can also be valuable knowledge when designing this type of system.

Pulse-Driving Based Magnetic Coupling Resonant Wireless Power Transmission System Research

2011 ◽  
Vol 378-379 ◽  
pp. 539-542
Author(s):  
Qiang Wang ◽  
Hong Li
Keyword(s):  
Optimization Design ◽  
Power Transmission ◽  
Magnetic Coupling ◽  
Transmission Efficiency ◽  
Transmission System ◽  
System Research ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Power Transmission System ◽  
Magnetic Resonances

This paper analyses and designs a kind of pulse-driving based wireless power transmission system via coupled magnetic resonances. It analyzes the influence of the related parameters on the transfer efficiency and transfer power of the system. The experiment tests the proposed wireless power transmission system, and the results show that the above relevant parameters should be comprehensively considered, in order to achieve the optimization design of the transmission efficiency or transmission power. The experiment results also show the validity of the theoretical analysis.

Network Analysis and Impedance Matching Methods for Wireless Power Transfer via Coupled Magnetic Resonances

2013 ◽  
Vol 437 ◽  
pp. 301-305 ◽  
Author(s):  
Yan Ting Luo ◽  
Yong Min Yang ◽  
Zhong Sheng Chen
Keyword(s):  
Network Analysis ◽  
Power Transmission ◽  
Impedance Matching ◽  
Wireless Power Transfer ◽  
Transmission Efficiency ◽  
Power Transfer ◽  
Wireless Power ◽  
Matching Method ◽  
Transmission Distance ◽  
Magnetic Resonances

Wireless power transfer (WPT) via coupled magnetic resonances has received much attention owing to its high power transmission efficiency at mid-range distance in recent years. In this paper, a novel network method is used to analyze the WPT system. A two-port network model of the system is built and the ABCD parameters of the model are innovatively used to characterize the system. Then the power transmission efficiency is analyzed at different transmission distance. To improve the power transmission efficiency, an impedance matching method is proposed based on the network analysis of the system. In the end, its feasibility is testified by a case study. The results demonstrate that the maximum power transmission efficiency can be achieved by using the impedance matching method proposed in this paper.

scholarly journals Optimization for Compact and High Output LED-Based Optical Wireless Power Transmission System

Photonics ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 14
Author(s):  
Mingzhi Zhao ◽  
Tomoyuki Miyamoto
Keyword(s):  
Electromagnetic Interference ◽  
Power Transmission ◽  
Light Emitting Diode ◽  
Transmission Efficiency ◽  
Optical Wireless ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Long Distance ◽  
Transmission Distance ◽  
Led Array

Optical wireless power transmission (OWPT) is a technology that supplies energy remotely. Due to the great advantages of long transmission distances, high directionality, no electromagnetic interference noise, and loose safety regulations, light emitting diode (LED) based OWPT systems become appropriate candidates for powering various applications, especially for the Internet of things (IoT). In this paper, improved LED-OWPT systems are proposed based on a collimation scheme for optimizing the system dimension and output. In a single LED configuration, the system dimension is compressed by 46% while the high transmission efficiency is maintained. As for the LED-array system, the dimension is compressed by 56%, and the output is enhanced by 40%. In the experiment, a high electricity output of 532 mW is achieved at 1 m transmission distance. In addition, the effect of misalignment between LED and lens and the potential of long-distance transmission are clarified in the LED-array OWPT system.

scholarly journals Study on electromagnetic characteristics of the magnetic coupling resonant coil for the wireless power transmission system

2018 ◽  
Vol 16 (1_suppl) ◽  
pp. 140-149 ◽  
Author(s):  
Zhongxian Wang ◽  
Yiping Liu ◽  
Yonggeng Wei ◽  
Yilin Song
Keyword(s):  
Output Power ◽  
Power Transmission ◽  
Magnetic Coupling ◽  
Transmission Efficiency ◽  
Transmission System ◽  
The Novel ◽  
Wireless Power ◽  
Energy Transmission ◽  
Coil Structure ◽  
The Relationship

Background: The resonant coil design is taken as the core technology in the magnetic coupling resonant wireless power transmission system, which achieves energy transmission by the coupling of the resonant coil. This paper studies the effect of the resonant coil on energy transmission and the efficiency of the system. Combining a two-coil with a three-coil system, the optimum design method for the resonant coil is given to propose a novel coil structure. Methods: First, the co-simulation methods of Pspice and Maxwell are used. When the coupling coefficient of the resonant coil is different, the relationship between system transmission efficiency, output power, and frequency is analyzed. When the self-inductance of the resonant coil is different, the relationship between the performance and frequency of the system transmission is analyzed. Then, two-coil and three-coil structure models are built, and the parameters of the magnetic field of the coils are calculated and analyzed using the finite element method. In the end, a dual E-type simulation circuit model is used to optimize the design of the novel resonance coil. Results: The co-simulation results show that the coupling coefficients of the two-coil, three-coil, and novel coil systems are 0.017, 0.17 and 0.0126, respectively. The power loss of the novel coil is 16.4 mW. Conclusions: There is an obvious improvement in the three-coil system, which shows that the magnetic leakage of the field and the energy coupling are relatively small. The new structure coil has better performance, and the load loss is lower; it can improve the system output power and transmission efficiency.

scholarly journals Design of High-Power High-Efficiency Wireless Charging Coils for EVs with MnZn Ferrite Bricks

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Yuyu Zhu ◽  
Zuming Wang ◽  
Xin Cao ◽  
Li Wu
Keyword(s):  
High Power ◽  
High Efficiency ◽  
Power Transmission ◽  
Transmission Efficiency ◽  
Wireless Transmission ◽  
Wireless Charging ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Quality Factors ◽  
Transmission Distance

In wireless power transmission systems, the inductance, equivalent resistance, and quality factors of the coils are the main factors that influence the system’s transmission efficiency. When designing high-power wireless charging coils for electric vehicles (EVs), ferrite bricks that increase magnetic flux can be selected to increase the self-inductance of the coils, improving the wireless transmission distance and transmission efficiency. In this paper, the effects of the ferrite bricks, the size of the coils, the charging distance, and many other factors in real applications have been extensively studied. After theoretical analysis and simulation, the wireless transmission system has been fabricated and measured. The measured and simulated results are in good agreement. High-power high-efficiency wireless power transmission has been achieved for EVs compared with many other previous literatures.

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