Efficiency improvement of wireless power transfer via magnetic resonance using the third coil
نویسندگان
چکیده
A wireless power transfer system via magnetic resonance has been reported by several groups [1-3]. In those reports, two resonance coils work as a transmission coil and a reception coil, respectively. The transfer efficiency between two coils is a function of the distance and the orientation between the coils. When the distance between the two coils is long, the transfer efficiency is small. When two coils share a single axis, the transfer efficiency is maximal, but otherwise the efficiency becomes lower. If the axes of them are orthogonal and the center of one coil lies on the axis of another, the transfer efficiency becomes minimal. In some applications where the distance and the orientation of the coils are difficult to keep fixed, an appropriate countermeasure against the decline of transfer efficiency is desired. In this paper, a wireless power transfer system via magnetic resonance using the third coil is proposed to improve the transfer efficiency. The third coil, which is implemented in the wireless power transfer system, does not need to carry any electrical device such as an amplifier circuit or a rectifier circuit. The proposed system can improve the transfer efficiency when the distance between two coils is large. Also, the proposed system can improve the transfer efficiency when one of the coils rotates and their axes become separated. The effectiveness of the proposed system is confirmed by measurement using a vector network analyzer.
منابع مشابه
3-D RF Coil Design Considerations for MRI
High-frequency coils are widely used in medical applications, such as Magnetic Resonance Imaging (MRI) systems. A typical medical MRI includes a local radio frequency transmit/receive coil. This coil is designed for maximum energy transfer or wave transfer through magnetic resonance. Mutual inductance is a dynamic parameter that determines the energy quantity to be transferred wirelessly by ele...
متن کاملA Magnetic-Balanced Inductive Link for the Simultaneous Uplink Data and Power Telemetry
When using the conventional two-coil inductive link for the simultaneous wireless power and data transmissions in implantable biomedical sensor devices, the strong power carrier could overwhelm the uplink data signal and even saturate the external uplink receiver. To address this problem, we propose a new magnetic-balanced inductive link for our implantable glaucoma treatment device. In this in...
متن کاملDesign of Wireless Power Transfer Systems Using Magnetic Resonance Coupling for Implantable Medical Devices
Efficient and compact wireless power transfer (WPT) systems are proposed and designed for recharging small implantable medical devices. They use the magnetic resonance coupling scheme to transfer power over a relatively large distance. The receiver resonator coil and the load loop are designed in correspondence to size restriction of implantable devices. The dimensions of the coils are optimize...
متن کاملWireless Power Transfer (WPT) using Strongly Coupled Magnetic Resonance (SCMR) At 5.8 GHz for Biosensors Applications: A Feasibility Study by Electromagnetic (EM) Simulations
We report here a detailed 3-dimensional (3-D) electromagnetic (EM) simulation study on the feasibility of Wireless Power Transfer (WPT) using the strongly coupled magnetic resonance (SCMR) effect at 5.8 GHz for potential μm-scale biosensors applications. The tiny 110 μm x110 μm planar aluminum inductor coil is built on the silicon substrate as our miniaturized receiver coil, which has been desi...
متن کاملA Wireless Magnetic Resonance Energy Transfer System for Micro Implantable Medical Sensors
Based on the magnetic resonance coupling principle, in this paper a wireless energy transfer system is designed and implemented for the power supply of micro-implantable medical sensors. The entire system is composed of the in vitro part, including the energy transmitting circuit and resonant transmitter coils, and in vivo part, including the micro resonant receiver coils and signal shaping chi...
متن کامل