Dual-Band Coil Module With Repeaters for Diverse Wireless Power Transfer Applications

Kung, Ming-Lung; Lin, Ken‐Huang

doi:10.1109/tmtt.2017.2711010

Cited by 36 publications

(20 citation statements)

References 29 publications

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“…For dual-band WET links, the ratio between frequencies selected is equally important since it is proportional to the transfer efficiency variance between f 1 and f 2 [28]. Additionally, selecting a larger ratio between frequencies with both power and data being transmitted at significantly lower and higher operating frequency bands turns out to be one of the isolation options available in curbing interference [23].…”

Section: Frequency Selectionmentioning

confidence: 99%

“…Apart from deciding on the type of design approach to engage with, dual-band support configuration ought to be determined as well. Applicable configurations [28] involve designing either identical support mode as in dual-band transmitter (TX) and dual-band receiver (RX) or nonidentical support mode as in dual-band transmitter and single-band receivers. Bearing in mind that there is no superior design approach, rectification techniques employed address the respective shortcomings.…”

Section: Design Approachesmentioning

confidence: 99%

“…Likewise, incorporating intermediate elements such as repeater in a single-coil approach is a remedy to the predicament in achieving simultaneous high-energy transfer for dual-band as demonstrated in [28,61]. It is worth noting that additional repeater entails more space allocation apart from frequency splitting manifestation of either one of the frequency bands owing to strong coupling.…”

Section: Resonator Configurationmentioning

confidence: 99%

See 2 more Smart Citations

Dual-Band Resonator Designs for Near-Field Wireless Energy Transfer Applications

Pon¹,

Himdi²,

Rahim³

et al. 2020

Recent Wireless Power Transfer Technologies

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Dual-band near-field wireless energy transfer (WET) designs outweigh single-band system with regard to either concurrent energy and data transfer or multiple wireless charging standard functionalities. There are two major approaches in resonator designs, namely, multi-coil and single-coil. This chapter presents a review on design constraints for each design approach and rectification techniques available in counteracting impediments of dual-band near-field WET systems. Challenges pertinent to link design are discussed primarily followed by methods implemented to mitigate detrimental impact on performance metrics. Front-end dual-band resonator design methods are accentuated in this chapter in lieu of endto-end WET system. This is envisioned to offer insights for designers contemplating on design modes or developing ways to facilitate a boost in rectification options currently available.

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Section: Frequency Selectionmentioning

confidence: 99%

Section: Design Approachesmentioning

confidence: 99%

Section: Resonator Configurationmentioning

confidence: 99%

See 1 more Smart Citation

Dual-Band Resonator Designs for Near-Field Wireless Energy Transfer Applications

Pon¹,

Himdi²,

Rahim³

et al. 2020

Recent Wireless Power Transfer Technologies

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show abstract

“…However, the dual-frequency impedance matching is difficult in dual-band systems. Multi-coils [10] or repeaters [12] have been used to implement the dual-band impedance matching, which increases the complexity of the system. Here we utilize the couplings between our resonant coils and coupling loops, similar to the coils in four-coil WPT systems [14].…”

Section: Dual-band Impedance Matchingmentioning

confidence: 99%

“…In the multi-coil mode, the system adopts multiple resonant coils with individual frequencies to transfer concurrently [10,11], but unwanted cross-coupling among resonant coils would cause interference among channels. [12,13] introduce a one-coil dual-band architecture with extra series resonant circuit, but repeaters are needed to realize the dual-band impedance matching.…”

Section: Introductionmentioning

confidence: 99%

A Novel Dual-Band Scheme for Magnetic Resonant Wireless Power Transfer

Ding¹,

Yu²,

Lin³

2018

PIER Letters

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In this paper, a novel dual-band scheme is proposed and analyzed for dual-band magnetic resonant wireless power transfer. The scheme consists of a novel resonant coil structure for dualband resonance and a coupling loop for dual-band impedance matching. Circuit-based analysis and experiments verify that our scheme can achieve dual-band power transfer easily and effectively, with its dual-band reflection coefficient lower than −18 dB and transmission efficiency over 37.21% at a distance of 20 cm at 6.78 MHz and 13.56 MHz.

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Operating characteristics of four‐coil magnetic resonant coupling wireless power transfer under different resonant states

Wang

Zhang

et al. 2020

Circuit Theory & Apps

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In wireless power transfer, the transfer efficiency decreases with the increase of the transfer distance. To improve the power transfer performance, the operating characteristics of a conformal coplanar four-coil magnetic resonant coupling wireless power transfer system are investigated and analyzed under four different resonant states. Based on the complete equivalent circuit model, the transmission coefficient and the input impendence are calculated. The performance of the systems operated under four resonant states is studied and compared. Also, the origin of the difference is specifically analyzed. The simulation results indicate that the wireless power transfer system operated under State 1, the state where the compensated serial capacitance makes the coils work at the frequency of the maximum Q-factor, shows the most excellent transfer characteristic among the four resonant states. The transmission coefficient can be well maintained above 0.8 within the transfer distance of 30 cm. Experiment has been carried out for validation, and the result indicates that more power can be delivered to the load for the system operated under State 1. K E Y W O R D S operating characteristics, resonant state, transmission coefficient, wireless power transfer 1 | INTRODUCTION Wireless power transfer has received a great deal of attention as it provides a possibility to deliver energy without power lines. A variety of wireless power transfer techniques have been developed, which are based either on near-field or farfield electromagnetic coupling. 1,2 Previous studies have demonstrated that higher power transfer efficiency can be obtained via the near-field techniques than the far-field approaches. In the near-field techniques, compared with the traditional inductively coupled scheme, magnetic resonant coupling wireless power transfer (MRC-WPT) has been a hot research area due to its longer transfer distance. 3 Thus, it is applied in various applications such as implanted biomedical devices, portable electronics, and electric vehicle charging system. 4-6 Generally, most MRC-WPT systems are featured with two coils. It has been revealed in other studies 7-9 that the transfer performance of the two-coil system deteriorates with the increase of the transfer distance due to the weakened magnetic coupling. To extend the transfer distance, MRC-WPT systems with repeaters positioned between transmitting and receiving coils have been investigated. 10-15 Nevertheless, the transmission efficiency

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Dual-Band Coil Module With Repeaters for Diverse Wireless Power Transfer Applications

Cited by 36 publications

References 29 publications

Dual-Band Resonator Designs for Near-Field Wireless Energy Transfer Applications

Dual-Band Resonator Designs for Near-Field Wireless Energy Transfer Applications

A Novel Dual-Band Scheme for Magnetic Resonant Wireless Power Transfer

Operating characteristics of four‐coil magnetic resonant coupling wireless power transfer under different resonant states

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