Automated Impedance Matching System for Robust Wireless Power Transfer via Magnetic Resonance Coupling

Beh, Teck Chuan; Kato, Masaki; Imura, Takehiro; Oh, Sehoon; Hori, Yoichi

doi:10.1109/tie.2012.2206337

Cited by 419 publications

(166 citation statements)

References 24 publications

Supporting

Mentioning

160

Contrasting

Unclassified

Order By: Relevance

“…From Equations (13), (14) and (16), it is noted that the power transfer efficiency is a strong function of the distance between the Tx and Rx (d 23 ). However, for our design considerations that involve optimization of the power transfer efficiency for various d 23 at a fixed frequency, Cases 1 and 2 in Section 4 are considered.…”

Section: Simulation and Experimental Resultsmentioning

confidence: 99%

“…The Figures 6 and 7 indicate that one of the three loops is chosen to achieve maximum S 21 for a particular distance. From Equation (14) and Figure 7, for the maximum efficiency up to d 23 = 31 cm, loop3 is connected to the supply; for d 23 > 31 cm and d 23 ≤ 36 cm, loop2 is connected to the supply; and for d 23 > 36 cm, loop1 is connected to the supply. This validates that the proposed loop switching technique aids obtaining the maximum efficiency for variable distances between the transmitter and receiver.…”

Section: Simulation and Experimental Resultsmentioning

confidence: 99%

“…The simulated S 21 of the system for Case 2 with respect to k 23 and d 23 is depicted in Figures 8 and 9, respectively. From Equation (14) and the graph in Figure 9, maximum efficiency is derived for d 23 ≤ 33 cm when loop3 is connected to the supply; for maximum efficiency in the range d 23 > 33 cm and d 23 ≤ 52 cm, loop2 is connected to the supply; and for d 23 > 52 cm, loop1 is connected to the supply. The plot in Figure 9 referring to Case 2 in comparison to Figure 7 referring to Case 1 exhibits higher efficiency over a wider range of d 23 , which validates the Case 2 system to be more effective for implementation.…”

Section: Simulation and Experimental Resultsmentioning

confidence: 99%

“…To obtain maximum efficiency for a WPT system, several methods have been proposed and studied in prior works [11][12][13][14][15][16][17][18][19][20][21]. These methods consist of adaptive circuits to optimize efficiency based on frequency control, impedance matching control, Q-factor tuning control and adjusting the coupling coefficient.…”

Section: Introductionmentioning

confidence: 99%

“…However, the technique violates the frequency standards (Industrial Scientific Medical (ISM) Band) of wireless power transmission as it requires a wide frequency bandwidth. In [12,[14][15][16][17]22], adaptive impedance matching-based efficiency improvement is proposed. However, the range of tuning to obtain optimal efficiency was limited by the varactors employed in the circuit, and additionally, varactor losses reduced the total efficiency of the system.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

An Efficiency Enhancement Technique for a Wireless Power Transmission System Based on a Multiple Coil Switching Technique

Nair

Choi

2016

Energies

View full text Add to dashboard Cite

For magnetic-coupled resonator wireless power transmission (WPT) systems, higher power transfer efficiency can be achieved over a greater range in comparison to inductive-coupled WPT systems. However, as the distance between the two near-field resonators varies, the coupling between them changes. The change in coupling would in turn vary the power transfer efficiency. Generally, to maintain high efficiency for varying distances, either frequency tuning or impedance matching are employed. Frequency tuning may not limit the tunable frequency within the Industrial Scientific Medical (ISM) band, and the impedance matching network involves bulky systems. Therefore, to maintain higher transfer efficiency over a wide range of distances, we propose a multiple coil switching wireless power transmission system. The proposed system includes several loop coils with different sizes. Based on the variation of the distance between the transmitter and receiver side, the power is switched to one of the loop coils for transmission and reception. The system enables adjustment of the coupling coefficient with selective switching of the coil loops at the source and load end and, thus, aids achieving high power transfer efficiency over a wide range of distances. The proposed technique is analyzed with an equivalent circuit model, and simulations are performed to evaluate the performance. The system is validated through experimental results that indicate for a fixed frequency (13.56 MHz) that the switched loop technique achieves high efficiency over a wider range of distances.

show abstract

Section: Simulation and Experimental Resultsmentioning

confidence: 99%

Section: Simulation and Experimental Resultsmentioning

confidence: 99%

Section: Simulation and Experimental Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

An Efficiency Enhancement Technique for a Wireless Power Transmission System Based on a Multiple Coil Switching Technique

Nair

Choi

2016

Energies

View full text Add to dashboard Cite

show abstract

Prosthetic Power Supplies

Trigui

Mehri

Ammari

et al. 2015

Wiley Encyclopedia of Electrical and Electronics Engineering

View full text Add to dashboard Cite

During the last few decades, implantable medical devices (IMDs) changed the landscape of modern medicine. Combining many technologies and employing smart medical devices within the human body, they allowed a continuous and automatic management of numerous health issues, such as pacemakers and implantable cardiac defibrillators, cochlear implants, bladder controllers, endoscopic capsules, nerve stimulators, lab‐on‐a‐chip, and artificial retinal prosthesis. Due to their continuously increasing potential, IMDs are getting more complex, thus requiring more energy to operate. Most of these advanced implantable devices are extracorporeally powered or battery charged through wireless power transfer (WPT) mechanisms. Following the basic principle of IMD power supplies, we introduce various power transfer techniques, and then focus on the inductive links and various methods to maximize the energy transferred to implantable devices and the calibration methods of these WPT techniques.

show abstract

Mid‐Range IPT by Dipole Coils

Rim¹,

2017

Wireless Power Transfer for Electric Vehicles and Mobile Devices

View full text Add to dashboard Cite

Automated Impedance Matching System for Robust Wireless Power Transfer via Magnetic Resonance Coupling

Cited by 419 publications

References 24 publications

An Efficiency Enhancement Technique for a Wireless Power Transmission System Based on a Multiple Coil Switching Technique

An Efficiency Enhancement Technique for a Wireless Power Transmission System Based on a Multiple Coil Switching Technique

Prosthetic Power Supplies

Mid‐Range IPT by Dipole Coils

Contact Info

Product

Resources

About