Non-radiative mid-range wireless power transfer: An experiment for senior physics undergraduates

Coaxial coil topology is used as the transfer medium in traditional MCR-WPT (Magnetic Coupled Resonant Wireless Power Transfer) systems to improve the transfer characteristics. The intermediate coils are added to extend the transmission distance, whose positions are critical. This paper focuses on the optimal intermediate coil positions for an MCR-WPT system with four coaxial planar circular spiral coils. By modeling the MCR-WPT system, the mathematical expression of the self-inductance and the mutual inductance are used to calculate the load power of the MCR-WPT system, which is composed of four planar circular spiral coaxial coils, and using MATLAB. The optimal distance ratio between the adjacent coils for maximizing the power of load is proposed. Furthermore, the experiments are implemented from the network analyzer and the experimental platform. In the platform, the load power is measured at the different intermediate coil positions, and the optimal position at which the load power is maximized is found. Both experimental results obtained by the network analyzer and the experimental platform have validated the theoretical and simulation results and provided the correctness of the suggested ratios.

show abstract

“…Then the ratio of load to source voltage provides the voltage gain, as solved from (7), and yields (8).…”

Section: System Analysismentioning

confidence: 99%

Optimal Position of the Intermediate Coils in a Magnetic Coupled Resonant Wireless Power Transfer System

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Magnetic induction plays an increasing role in wireless power transfer and communications both in air and under water [1][2][3][4][5][6][7]. Meanwhile, electromagnetic induction and wireless power transfer are two phenomena often demonstrated in educational settings, either in class or as a part of lab courses [7][8][9][10][11]. During a demonstration, one is often interested in leaving a visual impact, for example a light emitting diode (LED) turning on [7].…”

Section: Introductionmentioning

confidence: 99%

Magnetic docking stations for remotely powered light emitting diodes

Wen¹

2022

Eur. J. Phys.

View full text Add to dashboard Cite

Light emitting diodes (LEDs) are efficient light sources which due to low power consumption often are considered for demonstrations of wireless energy transmission. It is often not only necessary to power these light sources wirelessly, but also to ensure that they conveniently dock at the correct position as effortlessly as possible without the need for chemical adhesives or mechanical attachment. In the current work a passive magnetic docking system which aids attachment of wirelessly powered LEDs is proposed. The system utilizes electromagnetic induction of nearby coils to power the LED. The spatial range of the magnetostatic interactions is controlled by the specific magnet arrangement used, such that the light is turned on either before or after docking is initiated. The constant and time-varying magnetic fields occupy the same volume, thus allowing the presenter to demonstrate the difference between magnetostatic interactions locking the LED in place and electromagnetic induction turning the LED on. It is demonstrated that the proposed system works well for light signaling in salt water, and may find use in wireless underwater communication.

show abstract

“…M OST inductive power transfer (IPT) systems use helical [1]- [6] or spiral resonators [7]- [11]. These types of resonators are easy to construct, have long free-space wavelengths λ compared to the resonator diameter d with d/λ ∼ 0.02, and have high quality factors Q ∼ 10 3 [1].…”

Section: Introductionmentioning

confidence: 99%

Mid-Range Wireless Power Transfer at 100 MHz using Magnetically-Coupled Loop-Gap Resonators

Roberts,

Clements,

McDonald

et al. 2021

Preprint

View full text Add to dashboard Cite

We describe efficient four-coil inductive power transfer (IPT) systems that operate at 100 MHz. The magnetically-coupled transmitter and receiver were made from electrically-small and high-Q loop-gap resonators (LGRs). In contrast to the commonly-used helical and spiral resonators, the LGR design has the distinct advantage that electric fields are strongly confined to the capacitive gap of the resonator. With negligible fringing electric fields in the surrounding space, the IPT system is immune to interference from nearby dielectric objects, even when they are in close proximity to the transmitter and/or receiver. We experimented with both cylindrical and split-toroidal LGR geometries. Although both systems performed well under laboratory conditions, the toroidal geometry has the additional advantage that the magnetic flux is weak everywhere except within the bore of the LGR and in the space directly between the transmitter and receiver. Furthermore, we show that the toroidal LGR system can be operated efficiently at a fixed frequency for a wide range of transmitter-receiver distances. The experimental results are complimented by 3-D finite-element simulations which were used to investigate the electromagnetic field profiles and surface current density distributions. Finally, we demonstrate the use of our IPT system at powers up to 32 W and discuss possible applications.Index Terms-Field confinement, field shaping, inductive coupling, inductive power transfer (IPT), loop-gap resonator (LGR), mid-range, wireless power transfer (WPT).

show abstract

Non-radiative mid-range wireless power transfer: An experiment for senior physics undergraduates

Cited by 8 publications

References 13 publications

Optimal Position of the Intermediate Coils in a Magnetic Coupled Resonant Wireless Power Transfer System

Optimal Position of the Intermediate Coils in a Magnetic Coupled Resonant Wireless Power Transfer System

Magnetic docking stations for remotely powered light emitting diodes

Mid-Range Wireless Power Transfer at 100 MHz using Magnetically-Coupled Loop-Gap Resonators

Contact Info

Product

Resources

About