General Analysis on the Use of Tesla's Resonators in Domino Forms for Wireless Power Transfer

Abstract

In this paper, we present a brief overview of historical developments of wireless power and an analysis on the use of Tesla's resonators in domino forms for wireless power transfer. Relay resonators are spaced between the transmitter and receiver coils with the objectives of maximizing energy efficiency and increasing the overall transmission distance between the power source and the load. Analytical expressions for the optimal load and maximum efficiency at resonance frequency are derived. These equations are verified with practical measurements obtained from both coaxial and noncoaxial domino resonator systems. To avoid the use of high operating frequency for wireless power transfer in previous related research, the technique presented here can be used at submegahertz operation so as to minimize the power loss in both the power supply and the output stage. We demonstrated both theoretically and practically that unequal spacing for the coaxial straight domino systems has better efficiency performance than the equal-spacing method. Also, the flexibility of using resonators in various domino forms is demonstrated.Index Terms-Domino resonator system, maximum efficiency operation, relay resonator, wireless power transfer (WPT).

A novel dumbbell-shaped coil featured with cross coupling suppression for long distance relay wireless power transfer applications

“…8. It is found that the transmission distance has a great effect on the transmission efficiency of the domino MCR-WPT system [15], but, the transmission distance of the DS MCR-WPT has no effect on the transmission efficiency. The DS MCR-WPT system is a better solution to the problem which the CC between non-adjacent coils caused by frequency drift, efficiency the system.…”

“…9(a). The output and input voltage values are measured using an oscilloscope, and the output and input power values can be obtained, so the system transmission efficiency can be obtained [15]. The measured value load voltage V L and the system transmission efficiency along the frequency curve was determined per the oscilloscope range from 82.0 kHz and 90.0 kHz and compared to the calculated values, as shown in Fig.…”

“…As the distance of the receiving coil from the transmitting coil increases, the relay coil can more effectively enhance the transmission efficiency of the system [14]. A Domino-Resonator System working in the operating frequency of 500 kHz can increase the transmission distance [15]. The path can be flexibly adjusted by rearranging the relay coils [16,17].…”

“…The domino WPT system relay coil structure is in vertical arrangement [15]. Three-coil structure is used in the vertical arrangement and DS connected reversely and positively arrangement three-coil structure, when the single-turn coil radius r ¼ 1 m, the resulting changes in the mutual inductance of DC, CC and the distance of coil centers can be obtained as shown in Fig.…”

Wireless Power Transfer (WPT) using Strongly Coupled Magnetic Resonance (SCMR) At 5.8 GHz for Biosensors Applications: A Feasibility Study by Electromagnetic (EM) Simulations

“…Kim et al [9] pointed out that either a coaxially arranged relay coil or a perpendicularly arranged relay coil can considerably improve the system power transfer efficiency. Zhong et al [10] also analyzed the power transfer characteristics of multi-relay coils system using the Recently, wireless power transfer is also being used at subgigahertz (GHz) frequency to capsule endoscope where compact self-resonant antennas are designed to realize the transcutaneous power transfer [11]. It is commonly believed that efficient WPT to implantable devices require RF transmission frequency in the low MHz range to avoid excess losses in tissues.…”