Transfer efficiency analysis of magnetic resonance wireless power transfer with intermediate resonant coil

2014 ◽  
Vol 115 (17) ◽  
pp. 17A336 ◽  
Author(s):  
S. D. Huang ◽  
Z. Q. Li ◽  
Y. Li
Keyword(s):  
Magnetic Resonance ◽  
Wireless Power Transfer ◽  
Efficiency Analysis ◽  
Transfer Efficiency ◽  
Power Transfer ◽  
Wireless Power

Modelling and Efficiency-Analysis of Wireless Power Transfer using Magnetic Resonance Coupling

2017 ◽  
Vol 6 (3) ◽  
pp. 563
Author(s):  
Masood Rehman ◽  
Zuhairi Baharudin ◽  
Perumal Nallagownden ◽  
Badar Ul Islam
Keyword(s):  
Wireless Power Transfer ◽  
Efficiency Analysis ◽  
Coupling Factor ◽  
Consumer Electronics ◽  
Transfer Efficiency ◽  
Design System ◽  
Power Transfer ◽  
Wireless Power ◽  
Power Transfer Efficiency ◽  
And Performance

<p>Wireless power transfer (WPT) system has got significant attention in recent years due to its applications in consumer electronics, medical implants and electric vehicles etc. WPT is a promising choice in situations, where the physical connectors can be unreliable and susceptible to failure. The efficiency of WPT system decreasing rapidly with increasing air-gap. Many circuit topologies have been employed to enhance the efficiency of the WPT system. This paper presents the modelling and performance analysis of resonant wireless power transfer (RWPT) system using series-parallel-mixed topology. The power transfer efficiency analysis of the model is investigated via circuit theory. S-parameters have been used for measuring power transfer efficiency. Transient analysis is performed to realize the behavior of voltage and current waveforms using advanced design system (ADS) software. The proposed model is tested with two amplitudes i.e. 100 V peak-to-peak and 110 V peak-to-peak at the same frequency of 365.1 kHz. The overall result shows that the series-parallel-mixed topology model has higher efficiency at low coupling factor (K) for both voltage amplitudes.</p>

scholarly journals Implantable Magnetic Resonance Wireless Power Transfer System Based on 3D Flexible Coils

2020 ◽  
Vol 12 (10) ◽  
pp. 4149
Author(s):  
Dongdong Xu ◽  
Qian Zhang ◽  
Xiuhan Li
Keyword(s):  
Magnetic Resonance ◽  
Quality Factor ◽  
Wireless Power Transfer ◽  
Transfer Efficiency ◽  
Resonant Circuit ◽  
Transfer System ◽  
Power Transfer ◽  
Wireless Power ◽  
Coil Inductance ◽  
Wireless Power Transfer System

A magnetic resonance wireless power transfer system based on flexible 3D dual-coil is proposed and implemented in this paper. Firstly, a magnetic coupling resonant circuit model based on dual-coil is established, and the analysis indicates that enlarging the coil inductance and quality factor can effectively improve the transfer efficiency and performance. The coil parametric model is created by HFSS (High Frequency Structure Simulator), the effects of structural parameters on the coil inductance and quality factor are analyzed, and the optimized coil structure parameters are determined. To achieve maximum power transfer, the coupled resonant model after impedance matching is established and simulated in HFSS, and S11 reaches −30 dB at 13.56 MHz. Considering the radiation on human tissues, the SAR (Special Absorption Rate) value is evaluated simultaneously. To confirm the validity of the proposed prototype, the efficient wireless power transfer system composed of two flexible and biocompatible coils with 10 mm radius has been verified by the experimental measurements, and measure results show that the output power is 70 mW, when the transfer distance is 6 mm, the input power is 200 mW, and the maximum transfer efficiency is 35%.

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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