Plane-Type Receiving Coil With Minimum Number of Coils for Omnidirectional Wireless Power Transfer

Kim, Ji H.; Choi, Byeong G.; Jeong, Seog Y.; Han, Seung Ho; Kim, Hoi R.; Rim, Chun T.; Kim, Yun-Su

doi:10.1109/tpel.2019.2952907

Cited by 36 publications

(17 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An inductor, which stores energy as a magnetic field inside it, has been used in various industrial fields such as wireless energy transfer, radio-frequency (RF) engineering, inductor communication, and plasma engineering [1][2][3][4][5][6]. Especially, an inductor plays a significant role in a plasma source [7], an impedance matcher [8], and a voltagecurrent sensor [9].…”

Section: Introductionmentioning

confidence: 99%

Computational Analysis on Self-Resonance Frequency of Solenoid and Planar Inductor

Choi

Kim

Lee

et al. 2023

Appl. Sci. Converg. Technol.

View full text Add to dashboard Cite

Despite the importance of self-resonance frequency (SRF) in the operation of inductors, which is only effective below the SRF, a comprehensive analysis of the SRF in different inductor structures has yet to be conducted. This work employs a three-dimensional electromagnetic wave simulation to analyze SRF in the both solenoid and planar inductor structures with various inductor structure parameters such as the number of turns, radius, and inter-coil distance. We summarize the behavior of the SRF with these parameters. This result is valuable for radio-frequency engineering applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Computational Analysis on Self-Resonance Frequency of Solenoid and Planar Inductor

Choi

Kim

Lee

et al. 2023

Appl. Sci. Converg. Technol.

View full text Add to dashboard Cite

show abstract

“…Extensive research has been performed to study inductive WPT devices with three, four [17], and even more external coils [18]. Different topologies in array structures have been able to cover a large area, and various methods have been proposed for power transmission uniformity and the elimination of blank spots [19,20]. The most important ideas in the literature concern proposing models for the electrical excitement of external Extensive research has been performed to study inductive WPT devices with three, four [17], and even more external coils [18].…”

Section: Introductionmentioning

confidence: 99%

“…The most important ideas in the literature concern proposing models for the electrical excitement of external Extensive research has been performed to study inductive WPT devices with three, four [17], and even more external coils [18]. Different topologies in array structures have been able to cover a large area, and various methods have been proposed for power transmission uniformity and the elimination of blank spots [19,20]. The most important ideas in the literature concern proposing models for the electrical excitement of external coils via a power supply [21].…”

Section: Introductionmentioning

confidence: 99%

Using Overlapped Resonators in Wireless Power Transfer for Uniform Electromagnetic Field and Removing Blank Spots in Free Moving Applications

et al. 2022

View full text Add to dashboard Cite

We propose an induction link based on overlapping arrays to eliminate blank spots on the electromagnetic field for moving object applications. We use two arrays of four aligned coils that have a 50% overlap between the two plates. This mechanism compensates for the internal coil power drop at positions in the boundaries between two adjacent external coils. We showed that if these plates are excited, a uniform electromagnetic field is created in the movement direction of the moving object. This uniform electromagnetic field distribution will result in a constant receiving power at all points in the path of the moving internal coil with the same power consumption of one coil excitation. Power delivery to the moving object tolerance reaches 10% at most, while, in non-overlapped scenarios, it is approximately 50%. In addition, according to the theoretical calculations, printed circuit coils (PCB) for the array are designed for maximum efficiency. We found that the change in distance and dimensions of the receiver coil has a linear effect on power and efficiency. Moreover, a Specific Absorption Rate (SAR) simulation was performed for biocompatibility. In this paper, we investigate and record a 68% electrical power efficiency for the fabricated system. The array consists of eight transmitters coils of the same size and shape and a receiver coil at a distance of 4 cm. Furthermore, the fabricated coil has shown improved efficiency compared to similar studies in the literature and introduces a promising structure for bio-test applications.

show abstract

“…These design methods will cause an increment in the number of active components to operate the system, or prevents user from installing the system in a comfortable position due to their huge volume structure. In order to save volume, Han [19] proposed a receiving (Rx) coil with only two coils, which enables omnidirectional WPT for any type of transmitting (Tx) system. However, the above studies require ferrite core.…”

Section: Introductionmentioning

confidence: 99%

Design of novel coil structure for wireless power transfer system supporting multi-load and 2-D free-positioning

Zhao

Liu

et al. 2021

Electr Eng

View full text Add to dashboard Cite

In the classical WPT technology, when the load coil and the receiving coil are not aligned, the receiving power will be significantly reduced. In this paper, a new type of receiving coil named spiral add planar (SAP) coil is proposed, which can make the receiving power of the load coil almost independent of its position. The T-type equivalent circuit analysis method is used to analyze the transmission performance of the WPT system. By calculating the mutual inductance between non-coaxial coils, it can be proved theoretically that when the load coils are located at different positions, the mutual inductance between the SAP coil and the load coil is more stable comparing to the spiral coil or the planar coil. In addition, this SAP coil can support multiple loads and arbitrary movement of the load within the area of the SAP coil. This paper also proposed the concept of radius ratio (that is, the ratio of the radius of the load coil to the radius of the RX coil), and found that when the radius ratio is less than 1/2, the free-positioning characteristic is good. The simulation and experimental results show that when the load coil moves within the range of the SAP coil, the volatility of its S21 value is less than ± 1 dB.

show abstract

Plane-Type Receiving Coil With Minimum Number of Coils for Omnidirectional Wireless Power Transfer

Cited by 36 publications

References 34 publications

Computational Analysis on Self-Resonance Frequency of Solenoid and Planar Inductor

Computational Analysis on Self-Resonance Frequency of Solenoid and Planar Inductor

Using Overlapped Resonators in Wireless Power Transfer for Uniform Electromagnetic Field and Removing Blank Spots in Free Moving Applications

Design of novel coil structure for wireless power transfer system supporting multi-load and 2-D free-positioning

Contact Info

Product

Resources

About