Automated frequency tracking system for efficient mid‐range magnetic resonance wireless power transfer

Kim, Nam Yoon; Kim, Ki Young; Kim, Chang-Woo

doi:10.1002/mop.26858

Cited by 45 publications

(37 citation statements)

References 6 publications

(10 reference statements)

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“…Furthermore, the coupled RX coil is always assumed to be operating at resonance; this way the equivalent optimal load on the transmitter, reflected from the receiver, will only be resistive, affecting only the damping of the transmitter tank [2]. [11] III. COIL SYSTEM DESIGN AND CHARACTERIZATION To increase the efficiency of an IPT system, capable of transmitting tens to hundreds of watts at a distance of 30 cm, with perfectly aligned coils, simulations as described in [28] and measurements as described in [29], were undertaken for the TX and RX coils.…”

Section: Ipt Theorymentioning

confidence: 99%

“…High efficiencies of η ee = 90% have been achieved at distances of less than 30 cm but with relatively heavy systems (30-40 kg) that use field shaping ferromagnetic materials. In contrast, a system with frequency tracking and no ferromagnetic materials was used in [11], where an estimated η dc-load = 70% was calculated. Here, no clear description of the driver's efficiency is given, as it is based on a COTS 50 Ω system with added TX and RX loops.…”

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confidence: 99%

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Maximizing DC-to-Load Efficiency for Inductive Power Transfer

Pinuela

Yates

Lucyszyn

et al. 2013

IEEE Trans. Power Electron.

314

141

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Abstract-Inductive Power Transfer (IPT) systems for transmitting tens to hundreds of watts have been reported for almost a decade. Most of the work has concentrated on the optimization of the link efficiency and have not taken into account the efficiency of the driver. Class-E amplifiers have been identified as ideal drivers for IPT applications, but their power handling capability at tens of MHz has been a crucial limiting factor, since the load and inductor characteristics are set by the requirements of the resonant inductive system. The frequency limitation of the driver restricts the unloaded Q factor of the coils and thus the link efficiency. With a suitable driver, copper coil unloaded Q factors of over 1,000 can be achieved in the low MHz region, enabling a cost-effective high Q coil assembly. The system presented in this paper alleviates the use of heavy and expensive field-shaping techniques by presenting an efficient IPT system capable of transmitting energy with a dc-to-load efficiency above 77% at 6 MHz across a distance of 30 cm. To the authors knowledge this is the highest dc-to-load efficiency achieved for an IPT system without introducing restrictive coupling factor enhancement techniques.

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Section: Ipt Theorymentioning

confidence: 99%

mentioning

confidence: 99%

Maximizing DC-to-Load Efficiency for Inductive Power Transfer

Pinuela

Yates

Lucyszyn

et al. 2013

IEEE Trans. Power Electron.

314

141

View full text Add to dashboard Cite

show abstract

“…[6]introduced the distribution capacitance of planar spiral coil is changed with the change of frequency; [7] points out that there is a mutual restraint relationship between the system's frequency wavelength(λ), the transmission distance(D)and the coil radius(r). It is a matter of design wireless power transmission system that must be considered; [8] introduced when the resonance occurs, the resonance frequency of the helical antenna and the geometrical parameters' empirical formula; [9] introduced for the frequency splitting caused by the change of the transmission distance, ultimately lead to drastic changes in transmission efficiency, and proposed an automatic frequency tracking method; [10] use the mutual inductance circuit model, studied the causes of frequency splitting and the general rules. And the frequency tracking method is used to improve the transmission efficiency.…”

Section: Introductionmentioning

confidence: 99%

Effect of Layer Spacing and Coil Center Distance of PCB Coil on Resonant Frequency

Wei¹,

Chi²,

Wang³

2017

dtetr

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Abstract. With the development of electronic science and technology, people have entered the information society, a variety of portable electronic products enter people's lives. A large number of miniature human implantable medical devices applied to clinical fields. The traditional human implantable medical device power supply is implanted battery, its biggest drawback is the treatment problem after the battery power consumption. Whether it is taken to replace the new battery, or deep into the body, there is a huge risk. Therefore, the portable external wireless charging, it becomes the best choice for human implantable medical devices. In this paper, HFSS software is used to simulate, a large number of simulation experiments are carried out on the PCB with 2 layers coils. At the same time, the electrical parameters such as layer spacing, coil center distance and resonant frequency are analyzed. Finally, the conclusion is: in the case of fixed layer spacing, with the increasing of the coil center distance, the resonance frequency is gradually increasing; The increasing trend is becoming more and more obvious. When the coil center distance is fixed, with the growing layer spacing, the resonance frequency value is constantly increasing, the resonant frequency of the growth is also more and more slow.

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“…However, in the actual work environment, the parameters of the resonance elements will change with environmental factors, which will lead to detuning problem of the transmitting and receiving circuits. And the detuning problem will result in a significant decrease of transmission efficiency [17][18].…”

Section: Introductionmentioning

confidence: 99%

Study on frequency control technology of resonant wireless power transmission system

Ren

Yuan

2014

2014 IEEE Workshop on Advanced Research and Technology in Industry Applications (WARTIA)

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In order to solve the possible detuning problem which may appear in the resonant wireless power transmission (WPT) system, a new type of the frequency control technology is proposed. The frequency of the power supply and the inherent frequency of the transmitting circuit are controlled to scan the possible frequency range of the inherent frequency of the receiving circuit in order to analyze the inherent frequency of the receiving circuit by using the microprocessor, capacitance matrix and other circuit device in the transmit terminal of the system. And the frequency of the power supply and the inherent frequency of the transmitting circuit are made to track synchronously the inherent frequency of the receiving circuit. The circuit model of the frequency control technology of the resonant WPT system is established. The control principle of the system is then analyzed. The frequency control process of the system is given. The experimental system is designed and the correlative experiments are made. The results show that the frequency control technology can effectively solve the possible detuning problem in the system. This provides a powerful technology support for the practical application of the resonant WPT system.

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Automated frequency tracking system for efficient mid‐range magnetic resonance wireless power transfer

Cited by 45 publications

References 6 publications

Maximizing DC-to-Load Efficiency for Inductive Power Transfer

Maximizing DC-to-Load Efficiency for Inductive Power Transfer

Effect of Layer Spacing and Coil Center Distance of PCB Coil on Resonant Frequency

Study on frequency control technology of resonant wireless power transmission system

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