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

Nair, Vijith Vijayakumaran; Choi, Jeong Ryeol

doi:10.3390/en9030156

Cited by 32 publications

(20 citation statements)

References 26 publications

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“…R S , R L , P in and P out are the source resistance, load resistance, input and output power of the system respectively. The Equations (1)-(3) represent the mutual inductance (M ab ), quality factor (Q ab ), and PTE of the system [10,25].…”

Section: Equivalent Circuit Model and Orientation Analysis Of A 3-coimentioning

confidence: 99%

Evaluation of Specific Absorption Rate in Three-Layered Tissue Model at 13.56 MHz and 40.68 MHz for Inductively Powered Biomedical Implants

Mohanarangam¹,

Palagani²,

Choi³

2019

Applied Sciences

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This paper presents an optimized 3-coil inductive wireless power transfer (WPT) system at 13.56 MHz and 40.68 MHz to show and compare the specific absorption rate (SAR) effects on human tissue. This work also substantiates the effects of perfect alignment, lateral and/or angular misalignments on the power transfer efficiency (PTE) of the proposed WPT system. Additionally, the impacts of different tissue composition, input power and coil shape on the SAR are analyzed. The distance between the external and implantable coils is 10 mm. The results have been verified through simulations and measurements. The simulated results show that the SAR of the system at 40.68 MHz had crossed the limit designated by the Federal Communications Commission and hence, it is unsafe and causes tissue damage. Measurement results of the system in air medium show that the optimized printed circuit board coils at 13.56 MHz achieved a PTE of 41.7% whereas PTE waned to 18.2% and 15.4% at 10 mm of lateral misalignment and 60° of angular misalignment respectively. The PTE of a combination of 10 mm lateral misalignment and 60° angular misalignment is 21%. To analyze in a real-environment, a boneless pork sample with 10 mm of thickness is placed as a medium between the external and implantable coils. At perfect alignment, the PTE through pork sample is 30.8%. A RF power generator operating at 13.56 MHz provides 1 W input power to the external coil and the power delivered to load through the air and tissue mediums are 347 mW and 266 mW respectively.

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Section: Equivalent Circuit Model and Orientation Analysis Of A 3-coimentioning

confidence: 99%

Evaluation of Specific Absorption Rate in Three-Layered Tissue Model at 13.56 MHz and 40.68 MHz for Inductively Powered Biomedical Implants

Mohanarangam¹,

Palagani²,

Choi³

2019

Applied Sciences

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“…There are mainly two ways to realize a charging station: the first one is based on electrical contacts between the base station and the drone [6]. The second solution is based on the wireless power transfer (WPT) technology [7][8][9][10][11][12][13]. The contact-based solution allows high power transfer efficiency but the presence of contacts exposed to atmospheric agents will reduce the efficiency and reliability of the system.…”

Section: Introductionmentioning

confidence: 99%

Wireless Power Transfer Technology Applied to an Autonomous Electric UAV with a Small Secondary Coil

2018

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This study deals with the design and the optimization of a wireless power transfer (WPT) charging system based on magnetic resonant coupling applied to an electric vertical take-off and landing Unmanned Aerial Vehicle (UAV). In this study, a procedure for primary and secondary coil design is proposed. The primary circuit in the ground station consists of an array of coils in order to mitigate the negative effects on the coupling factor produced by the possible misalignment between the coils due to an imperfect landing. Key aspects for the design of the secondary coil onboard the UAV are the lightness and compactness of the WPT system components. A demonstrative prototype of the WPT system is applied to a commercial drone. The WPT electrical performances are calculated and measured. Finally, an automatic battery recharge station is built where the drone can autonomously land, recharge the battery and take off to continue its flight mission.

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“…Recently, the specification of the system that is capable of supplying more than 60 W of power to target devices has also been discussed in the Wireless Power Consortium (WPC) to expand the range of applications in consumer electronics and other devices, such as laptops, power tools, household appliances, medical devices and equipment, and electric bicycles [6][7][8]. The delivered power to the load can be described as the multiplication of the coupling efficiency between the transmitter and receiver, alternating current (AC)-to-direct current (DC) conversion efficiency at the receiver, and the transmitted power at the highly efficient transmitter [9]. An output transmitted power of over 100 W is required to obtain a delivered power of over 60 W, when the coupling and the power conversion efficiencies are assumed to be 70% and 90%, respectively.…”

Section: Introductionmentioning

confidence: 99%

A 120 W Class-E Power Module with an Adaptive Power Combiner for a 6.78 MHz Wireless Power Transfer System

Choi

Yang

2018

Energies

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In this article, a highly efficient power module is presented with two class-E power amplifiers and an adaptive power combiner for transmitting output powers >100 W at 6.78 MHz in a wireless power transfer system. The losses caused by the combiners and interstage matching circuits or mismatching between the amplifier, and the combiners can significantly reduce the overall efficiency of the power module. To achieve an efficient combination of the output amplifier signals, the adaptive power combiner is proposed based on the consideration of the optimum load impedance characteristics of the power amplifiers. The input impedance of the combiner is designed using series capacitors and resistors between the two input ports of the combiner and the two output signals of the class-E amplifiers at the optimum load condition. The output performances of the proposed module can decrease based on the component mismatch between the two power amplifiers. The proposed power module was implemented on an FR4 PCB, with a 15 mm metal heat sink, and demonstrated an output power of 123.3 W, a power-added efficiency of 85.7%, and a power gain of 25.6 dB at 6.78 MHz. The second harmonic suppression of the module was 37 dBc.

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

Cited by 32 publications

References 26 publications

Evaluation of Specific Absorption Rate in Three-Layered Tissue Model at 13.56 MHz and 40.68 MHz for Inductively Powered Biomedical Implants

Evaluation of Specific Absorption Rate in Three-Layered Tissue Model at 13.56 MHz and 40.68 MHz for Inductively Powered Biomedical Implants

Wireless Power Transfer Technology Applied to an Autonomous Electric UAV with a Small Secondary Coil

A 120 W Class-E Power Module with an Adaptive Power Combiner for a 6.78 MHz Wireless Power Transfer System

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