An adaptive technique to improve wireless power transfer for consumer electronics

Hoang, H.; Lee, Seunggyu; Kim, Youngsu; Choi, Yun Ho; Bien, Franklin

doi:10.1109/icce.2012.6161901

Cited by 28 publications

(34 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Changes in the transfer distance D or k 23 require changes in the gap S between the source and Tx coils, represented by k 12 , accordingly, in order to satisfy a following matching condition :

k_{12} = \sqrt{\frac{1}{Q_{1} Q_{2}} (1 + \frac{k_{23}^{2} Q_{2} Q_{3}}{1 + k_{34}^{2} Q_{3} Q_{4}})}

…”

Section: Analysis Of 3‐coil and 4‐coil Wpt Systemsmentioning

confidence: 99%

“…Wireless power transfer (WPT) technology has covered a wide range of applications to charge devices ranging from medical implants and mobile electronic devices to electric vehicles (EVs) , with power consumptions from microwatts to tens of kilowatts. These applications include pacemakers, cochlear hearing implants, low‐power‐radio‐frequency identification (RFID) tags, smart phones, laptops, and EV chargers, and the applications of WPT are expanding with extensively ongoing researches in this field.…”

Section: Introductionmentioning

confidence: 99%

“…A high transfer efficiency means to reduce heat dissipation within conductors, electromagnetic exposure to human, save energy, and lengthen battery's life cycle. Different approaches have been proposed for prediction of the behavior of a WPT system, including a reflected load theory , equivalent circuit theory , and coupled‐mode theory . The first two theories are widely used by engineers and developers, whereas the third is more familiar to physicists desiring to understand the propagation of an electromagnetic field and energy exchange in the system.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Magnetic resonance wireless power transfer for laptop computer with a ground plane

Nguyen

Kang

Jung

2017

Micro & Optical Tech Letters

View full text Add to dashboard Cite

This paper proposes a new method to increase the transfer efficiency of a wireless power transfer (WPT) system, having a source coil, a sprial transmitter (Tx) coil, a load coil and a ground plane, by utilizing the ground plane itself. The creation of cross slits at the ground center and employment of a lumped capacitor on the ground plane transform the ground plane into an additional resonator, which makes the original WPT system work as a 4‐coil WPT system, producing a higher efficiency. By experiment, with an optimized capacitor on the ground plane of C = 2180 pF, the measurement of transfer efficiency shows a maximum improvement of 10% at a transfer distance of 40 cm, compared to the case without the ground plane. The transfer efficiency of the proposed system at transfer distance of 15 cm is 46%. Circuit theory and electromagnetic simulations are employed to analyze the proposed WPT system, giving results consistent with the measured ones. The operating frequency of the proposed system is 6.78 MHz. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:514–521, 2017

show abstract

“…Changes in the transfer distance D or k 23 require changes in the gap S between the source and Tx coils, represented by k 12 , accordingly, in order to satisfy a following matching condition :

k_{12} = \sqrt{\frac{1}{Q_{1} Q_{2}} (1 + \frac{k_{23}^{2} Q_{2} Q_{3}}{1 + k_{34}^{2} Q_{3} Q_{4}})}

…”

Section: Analysis Of 3‐coil and 4‐coil Wpt Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic resonance wireless power transfer for laptop computer with a ground plane

Nguyen

Kang

Jung

2017

Micro & Optical Tech Letters

View full text Add to dashboard Cite

show abstract

“…For 2 resonant loops with fixed structure, it can be drawn from Equation 13 that the optimal number of turns for the inner coil of the transmitter is obtained, which is useful for the decrease of the dramatic change in the mutual inductance, as shown in Table 1. Figure 2 illustrates how the mutual inductance between the transmitter and the receiver varies with the distance without and with the inner coil respectively.…”

Section: Design Procedures Of the Resonant Loopsmentioning

confidence: 99%

Design and optimization of hybrid resonant loops for efficient wireless power transfer

Shi

Gao

Shen

et al. 2017

Circuit Theory & Apps

View full text Add to dashboard Cite

Frequency splitting, caused by magnetic overcoupling, is a great challenge in resonant wireless power transfer, which leads to decrease of transfer efficiency. In this paper, to avoid the frequency splitting, a new design of hybrid resonant loops with an inner coil positioned in the transmitter is proposed for efficient power transfer. It is shown to suppress dramatic variation of mutual inductance when the distance between transmitter and receiver decreases.Analytical expressions of the mutual inductance and the transfer efficiency for the proposed resonant wireless power transfer system are calculated. To obtain a relatively uniform mutual inductance with respect to the distance, the proposed resonant loops are optimized. Simulation and experiments are also performed to validate the effectiveness of the proposed resonant loops in eliminating the frequency splitting. The transfer efficiency remains higher than 80% when the transfer distance decreases below a critical value where frequency splitting occurs for conventional resonant loops. Furthermore, lateral and angular misalignments between the resonant loops are also considered and investigated. The results indicate that the proposed resonant loops are also applicable in suppressing the frequency splitting even in case of misalignments.KEYWORDS frequency splitting, hybrid resonant loops, mutual inductance, transfer efficiency, wireless power transfer (WPT)

show abstract

“…Magnetically coupled wireless power transfer (WPT) has applications in consumer electronics, biomedical devices, and industrial equipment . In these applications, to allow unrestricted use of moving devices, the wireless transfer range must be expanded.…”

Section: Introductionmentioning

confidence: 99%

Adjustable wireless power transfer system using port-selective switching coils

Lee

Shin

Park

2016

Microw. Opt. Technol. Lett.

View full text Add to dashboard Cite

A port‐selective switching (PSS) coil that has multiple terminations on a typical spiral is proposed for an adjustable wireless power transfer system. The impedance of the coil can be changed by selecting a different input/output port location, which enables the coil system to be adjustable. A PSS coil that has five switches is fabricated. The transfer range at which efficiency exceeds 50% increases by 2.5 times for the single‐sided PSS system and by 5.5 times for the double‐sided PSS system compared with the conventional system. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1420–1423, 2016

show abstract

An adaptive technique to improve wireless power transfer for consumer electronics

Cited by 28 publications

References 3 publications

Magnetic resonance wireless power transfer for laptop computer with a ground plane

Magnetic resonance wireless power transfer for laptop computer with a ground plane

Design and optimization of hybrid resonant loops for efficient wireless power transfer

Adjustable wireless power transfer system using port-selective switching coils

Contact Info

Product

Resources

About