Operation Characteristics of Wireless Power Charging from Copper Antenna at 300 K to Superconducting Receiver at 77K with 13.56 MHz under Different Materials of Cooling Vessels
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The wireless power transfer (WPT) using magnetic resonance coupling method has been known to have the advantage of being able to transfer power across large air gap with considerably high efficiency. As well as, as such a method can eliminate the physical contact loss in the system, it provides an ideal solution for the problem of contact losses in the power applications. Especially, since it is difficult to reduce the energy loss at connectors in the high temperature superconducting (HTS) magnet system, the WPT technology has been promisingly expected as a noble option to transfer electric power without physical contact from room temperature to very low temperature cooling vessel. From this point of view, authors proposed the combination WPT technology with HTS coils, it is called as, superconducting wireless power transfer (SUWPT) system. The SUWPT technique can be expected to solve the problem of the contact loss in the HTS joints, as well as, use with high levels of and low study, safety maintenance. In this authors examined transfer profiles between copper enameled antenna and HTS receiver coil with the usable frequency range at 13.56 MHz of RF power amplifier as long as the receiver is within 1.5 m distance under Styrofoam and stainless cooling vessels, respectively.Keywords:
Wireless Power Transfer
Coupling loss
USable
Wireless charging is a steady, appropriate and secure method of powering and charging Electric vehicles (EV). Inductive coupling is the most common method of Wireless Power Transfer (WPT). The performance of an inductively coupled energy transfer system for moderate operating distance between the transmitter and receiver coils can be improved by utilizing resonant circuits in both primary and secondary side. Compensation topologies are essential in magnetic resonant coupling WPT system to improve the Power Transfer Efficiency over certain distances and is being promoted for EV charger applications. This paper presents various compensation topologies for wireless power transfer and compare the results from both simulation and validates the same using experimental setup to support the concepts.
Wireless Power Transfer
Inductive coupling
Resonant inductive coupling
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Due to the inconvenience and safety issues caused by exposed plugs and damaged cables, wireless charging of electric vehicles (EV) has gained popularity. Inductive wireless power transfer has been successfully applied up to 30kW involving the charging of EV batteries. The capacitive wireless power transfer system is new for the EV charging application, but can address the transfer of power across metallic barriers with much less losses. The performance of different compensation topology for each system is compared based on the power transfer ability, complexity, switching frequency, electromagnetic interference tolerance and efficiency. Finally, the possibility of a hybrid topology for improving the power transfer, efficiency and misalignment tolerance is considered from the literature, which can also make the system size more compact by achieving cross resonance between inductive coils and capacitive plates. The review provides a brief account of the recent laboratory prototypes for inductive wireless power transfer (IWPT), capacitive wireless power transfer (CWPT) and hybrid wireless power transfer techniques which can be adopted for wireless EV charging.
Wireless Power Transfer
Inductive charging
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In magnetic resonant wireless power transfer (WPT), relays are placed between a transmitter and a receiver as a means of increasing both the operating distance and the power transfer efficiency, but this makes the analysis of the WPT system more complicated. In this letter, we derive a mathematical expression for the power transfer efficiency with an optimal load resistance based on an equivalent circuit model, and analyze the effects of varying the number of relays on the power transfer efficiency that can be achieved. By means of circuit-level simulations and experiments under a variety of scenarios, we verify the accuracy of our analysis, and we also confirm that there is an optimal number of relays for maximizing the achievable power transfer efficiency for a given end-to-end distance.
Wireless Power Transfer
Transfer efficiency
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Wireless Power Transfer (WPT) with inductive coupling is the one most advanced techniques for powering biomedical implants, in recent decades has been the transmission of energy without the need of cables. The importants elements (indicators), power transfer efficiency (PTE) and power delivered to load (PDL), of a wireless power transfer systems . These keys are dependent on several design parameters of WPT system, such as the geometrical parameters of the coils, the separation of the sender (TX) and the receiver (RX). And also the operating frequency. The invention, design, and optimization of coils square spirals in a wireless energy transfer system using a resonant inductive link are the emphasis of this paper. Metaheuristic algorithms are among the optimization techniques used.
Wireless Power Transfer
Inductive coupling
Power transmission
Energy exchange
Emphasis (telecommunications)
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Recent days, the demand for wireless power transfer (WPT) system is highly growing since it is more convenient, reliable and safer solution for electric vehicle (EV) consumers. Static and dynamic power transfer systems are the two opted appreciable wireless charging techniques for user friendly EVs. In static and dynamic charging systems, low power transfer efficiency (ηp) between transmitter and receiver coils is the principle challenge in existing issues of wireless charging system. The paper mainly focuses on improvement of power transfer efficiency in the system. The analyses presented in this paper are tested for distinct face to face distances of the coils to observe the effect of reluctance on power transfer efficiency. Here two kinds of coil structures have been adopted and are tested with various core configurations to find the suitable combination for the enhancement of power transfer efficiency. The paper presents a comparative analysis on performance characteristics of WPT system using inductive coupled and magnetic resonance coupled (MRC) power transfer techniques. In MRC system, various compensation topologies are used to find the efficient topology which enhances the better impedance matching in the system. Further, the analysis on effect of aluminum shielding is alsoreported.
Wireless Power Transfer
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The use of resonant magneto‐inductive links is an efficient technique to transfer power over midranges in the field of wireless power transfer (WPT). Power transfer efficiency (PTE) and power delivered to the load (PDL) are two important indicators of power transmission for a WPT system. A predetermined amount of PDL need be generated at maximum PTE for practical application in a WPT system; thus, the authors focus on maximising PTE and a predetermined amount of PDL for transfer in this study. First, load‐matching conditions are presented for maximum PTE transfer though circuit theory‐based analyses. Then, a new tuning method is proposed to transfer a predetermined amount of PDL which can be controlled by source‐matching distance at maximum PTE. The relations between the loss of a load‐matching resonator and the PTE (or PDL) of a correspondingly unmatched system are derived though analyses as well. Finally, the calculated results of the design examples are verified through electromagnetic simulations and experimental measurements.
Wireless Power Transfer
Magneto
Resonant inductive coupling
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Ideal alignment between the transmitting and receiving coil of the resonant inductive link is one of the prime needs in order to maximize power transfer in a resonant inductively coupled wireless power transfer (RIC-WPT) system. Nevertheless, vertical separation gap tolerance between the coils for specific coil dimension is equally important and cannot be ignored. In order to facilitate maximum wireless power transfer in a resonant inductive link, the critical separation air-gap allied with the coil dimension has been explored. The magnetic field analysis corroborated with the experimental investigation unveils an optimal coil separation distance of a resonant inductive link to uphold maximum power transfer without affecting the system design parameter of a RIC-WPT system used for powering or charging of electrical & electronic appliances.
Wireless Power Transfer
Air gap (plumbing)
Resonant inductive coupling
Inductive coupling
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In order to solve the problem of energy limitation in capsule endoscopy, the button battery can be replaced by an external wireless power. A small wireless power transfer system for delivering power to capsule endoscopy has been presented here. The wireless power transfer system is built by using a small cylindrical receiving resonator and two cylindrical source resonators to transfer power through coupled magnetic resonance. Experimentally, it is found that the wireless power transfer efficiency is stable within a certain range due to the stable magnetic field generated by two source resonators. The proposed design has the significant advantage of stable power transfer and small size for capsule endoscopy.
Wireless Power Transfer
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Due to the advantage of power transmission over certain distance without using wires, the wireless power transfer system has attracted more and more attention. This paper proposes an analytic approach to investigate the transfer efficiency of magnetically-coupled inductive wireless power transfer system with constant power load. The mathematical model of the wireless power transfer system with constant power load is developed, and the resonance condition is derived. Furthermore, the closed-form transfer power and the closed-form transfer efficiency of the system are proposed. The influence of output power, output voltage, input voltage, resonant frequency, and mutual inductance on the transfer power and transfer efficiency are analyzed. This paper can provide a guideline for engineers to follow in the application of magnetically-coupled inductive wireless power transfer system with constant power load.
Wireless Power Transfer
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A biomedical implant (BMI) is a device that allows patients to monitor their health condition at any time and obtain care from any location. However, the functionality of these devices is limited because of their restricted battery capacity, such that a BMI may not attain its full potential. Wireless power transfer technology–based magnetic resonant coupling (WPT–MRC) is considered a promising solution to the problem of restricted battery capacity in BMIs. In this paper, spider web coil–MRC (SWC-MRC) was designed and practically implemented to overcome the restricted battery life in low–power BMIs. A series/parallel (S/P) topology for powering the BMI was proposed in the design of the SWC-MRC. Several experiments were conducted in the lab to investigate the performance of the SWC-MRC system in terms of DC output voltage, power transfer, and transfer efficiency at different resistive loads and distances. The experimental results of the SWC-MRC test revealed that when the Vsource is 30 V, the DC output voltage of 5 V can be obtained at 1 cm. At such a distance (i.e., 1 cm), the SWC-MRC transfer efficiency is 91.86% and 97.91%, and the power transfer is 13.26 W and 23.5 W when 50- and 100-Ω resistive loads were adopted, respectively. A power transfer of 12.42 W and transfer efficiency of 93.38% were achieved at 2 cm for when a 150-Ω resistive load and a Vsource of 35 V were considered. The achieved performance was adequate for charging some BMIs, such as a pacemaker.
Wireless Power Transfer
Resistive touchscreen
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