Investigation of Wireless Power Transfer Using Planarized, Capacitor-Loaded Coupled Loops

Development and optimization of printed spiral coils have significant impacts on the power transfer efficiency (PTE) and operating range for magnetic resonant wireless power transfer (WPT) applications. In this paper, the effects of different material losses (substrate and conducting coating) of printed coils are considered and experimentally studied. For the purposes of comparison and finding the dominating losses, lossy loaded capacitors with equivalent series resistances have also been investigated. A four-coil system with an external capacitor-loaded (ECL) magnetic resonant WPT system is considered, and a self-resonant coil is designed and compared. Results show that the ECL resonant coil has higher PTE than the self-resonant coil with the same size and distance between the transmitting and receiving coils. Through observing the simulated results and analyzing experimental data, it can be concluded that the dominant cause of the decrease in PTE of this ECL-WPT system is the strip resistive loss of coil of 57% (0.891 dB) and the ohmic loss in ECL of 37% (0.568 dB). Meanwhile, the substrate loss significantly impacts on the PTE of the self resonant coil. The overall measured PTE is about 66% of the ECL coil at a distance of 50 mm when the above loss factors are considered. The measured results are in good agreement with the analysis and simulations.

Section: Introductionmentioning

confidence: 99%

Effect of Losses in Printed Rectangular Coils for Compact Wireless Power Transfer Systems

Chaimool¹,

Rakluea²,

Akkaraekthalin³

et al. 2019

“…As the WPT can effectively resolve this problem, it shows great potential for many industrial applications [18][19][20]. Nevertheless, almost all these applications rely on using WPT to perform battery charging first, and then the charged battery feeds the devices, appliances or vehicles afterwards [21,22]. By the same token, the wireless motor can readily be derived so that the portability problem of electric motors seems to be solved.…”

Section: Introductionmentioning

confidence: 99%

Development of Multiple-Frequency Wireless Coordinative Motor Drives

Jiang¹,

Chau²,

Lee³

et al. 2019

This paper proposes and implements a novel class of inductor-capacitor-capacitor wireless coordinative DC motor drives, which not only performs selective wireless power to motors, but also achieves power equalization to ensure the same operation for isolated robotic arms. The key is to make use of the selective wireless power transfer with several resonant frequencies and then use only one transmitter with the inductor-capacitor-capacitor compensation network to provide multiple-frequency transmission without relying on the switched-capacitor array. In order to provide simultaneous and independent wireless power to different motors and hence achieve the desired coordinative motion, a time-division multiplexing scheme and burst firing control are newly employed. Thus, the wireless power transfer system with multiple receivers can achieve better flexibility and simplicity. Both finite element analysis and experimental results are given to verify the validity of the proposed inductor-capacitorcapacitor wireless coordinative DC motor drive. As a result, the motors can achieve independent motion with 1200 rpm and simultaneous motion with 400 rpm when the torque is 10 Ncm, and the operating frequencies are set at 110 kHz and 130 kHz.

“…Since a novel technology based on magnetic resonant coupling wireless power transfer (MRCWPT) was proposed by researchers of MIT in 2007 [1], MRCWPT system has been widely applied in various fields from daily electrical products, medical equipment to aerospace fields [2][3][4]. MRCWPT system can solve the problems of conventional wired power transfer system, such as inadequate security, complex wiring, and frequent wire failures [5][6][7][8]. Due to the booming development of electric cars, consumer electronics, robots, portable devices, and other fields, MRCWPT technology has attracted much attention because of its great development prospect and broad market demand in the field of charging [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Omnidirectional Wireless Power Transfer System With Multiple Receivers and a Single Wire Wound Spiral Transmitter

Wang¹,

Deng²,

Luo³

et al. 2019

Last decade has witnessed dramatic advancements in wireless charging distance of magnetic resonant coupling wireless power transfer (MRCWPT) for various portable electronic devices. Driven by the demand of cost-effective and compact system working for multiple receivers, a novel omnidirectional MRCWPT system with a single wire wound spiral transmitter and a single power source is proposed in this work. Besides, an equivalent circuit model is established to derive the power transfer efficiency (PTE) of this novel MRCWPT system. Finite element simulation results have shown that the magnetic field distribution for the proposed model is uniform in all directions. And the PTE of the system depending on the distance between the transmitter and receivers is demonstrated to be independent of the receiving angles. Finally, the theoretical analysis of the simulation results is verified by practical experimental results, which shows that the PTE of the system reaches 60% at the distance of 160 mm and the resonant frequency of 15.5 MHz.