The most preferable working point investigation of the serial-serial system of wireless energy transfer in term of high efficiency

This chapter proposes an overview of microwave energy harvesting with focuses on the design of high efficiency low power rectifying circuits. A background survey of RF energy harvesting techniques is presented first. Then, the performances of conventional rectifier topologies are analyzed and discussed. A review of the most efficient rectenna designs, from the state of the art, is also presented. Design considerations for low power rectifier operations are detailed and new high efficient rectifying circuits are designed and evaluated in both GSM and ISM bands under low power constraints.

Download Full-text

High-efficiency transcutaneous wireless energy transfer for biomedical applications

2011 Defense Science Research Conference and Expo (DSR) ◽

10.1109/dsr.2011.6026860 ◽

2011 ◽

Author(s):

Rui-Feng Xue ◽

Pradeep Basappa K. ◽

Hyouk-Kyu Cha ◽

Yuanjin Zheng ◽

Minkyu Je

Keyword(s):

Energy Transfer ◽

Biomedical Applications ◽

High Efficiency ◽

Wireless Energy Transfer

Download Full-text

Neutral Point Type Buck-Boost Converter Circuit Application for Wireless Energy Transfer

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.785.91 ◽

2015 ◽

Vol 785 ◽

pp. 91-95

Author(s):

Muhamad Amin Ahmad ◽

Rijalul Fahmi Mustapa ◽

Ilham Rustam ◽

Harizan Che Mat Haris Mohd ◽

Nabil Hidayat

Keyword(s):

Energy Transfer ◽

High Efficiency ◽

Limited Range ◽

Neutral Point ◽

Receiver Coil ◽

Wireless Energy Transfer ◽

Transfer Energy ◽

Voltage Output ◽

Receiving Coil ◽

Point Type

In this paper, a design circuit of neutral point type buck boost has been utilized for wireless transfer energy application. Resonance magnetic field was used as the preferred wireless energy transfer approach due to its ability to generate high efficiency and an increased in distance between the transmitting and receiving coil. The constructed circuit has been found to be able to transmit a DC voltage output to the receiver coil with relatively small ripple voltage output at a limited range of around 15 centimetres.

Download Full-text

Analysis of the Coupling Coefficient in Inductive Energy Transfer Systems

Active and Passive Electronic Components ◽

10.1155/2014/951624 ◽

2014 ◽

Vol 2014 ◽

pp. 1-6 ◽

Cited By ~ 8

Author(s):

Rafael Mendes Duarte ◽

Gordana Klaric Felic

Keyword(s):

Energy Transfer ◽

Coupling Coefficient ◽

High Efficiency ◽

Good Accuracy ◽

Elliptic Integral ◽

Power Source ◽

Mutual Inductance ◽

Electrical Load ◽

Wireless Energy Transfer ◽

Static State

In wireless energy transfer systems, the energy is transferred from a power source to an electrical load without the need of physical connections. In this scope, inductive links have been widely studied as a way of implementing these systems. Although high efficiency can be achieved when the system is operating in a static state, it can drastically decrease if changes in the relative position and in the coupling coefficient between the coils occur. In this paper, we analyze the coupling coefficient as a function of the distance between two planar and coaxial coils in wireless energy transfer systems. A simple equation is derived from Neumann’s equation for mutual inductance, which is then used to calculate the coupling coefficient. The coupling coefficient is computed using CST Microwave Studio and compared to calculation and experimental results for two coils with an excitation signal of up to 10 MHz. The results showed that the equation presents good accuracy for geometric parameters that do not lead the solution of the elliptic integral of the first kind to infinity.

Download Full-text

Improving the Transfer Efficiency of a Wireless Energy Transfer System Using Multiple Coils

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.860-863.2275 ◽

2013 ◽

Vol 860-863 ◽

pp. 2275-2278

Author(s):

Hon Tat Hui ◽

Shi Pu ◽

Marcus Choo Ann Loong

Keyword(s):

Energy Transfer ◽

High Efficiency ◽

Energy Transfer Efficiency ◽

Transfer Efficiency ◽

Receiver Coil ◽

Wireless Energy Transfer ◽

Large Power ◽

Room Size ◽

Coil Method ◽

Multiple Transmission

This study is to suggest using multiple transmission coils to improve the energy transfer efficiency of a wireless energy transfer (WET) system which aims to power electronic appliances such mobile phones, labtops, iPads, etc, without using cables. The original WET system consists of a large room-size transmission coil transferring energy wirelessly to a small receiver coil built insider an electronic appliance. The newly proposed system is to replace the single transmission coil with 3 orthogonally aligned transmission coils. The aim is to create a multi-oriented magnetic field so that energy transfer efficiency will be relatively more stable when the receiver coil changes in orientation. Our simulation results show that at some worse-situation orientations of the receiver coil, the increase in transfer efficiency is many folds, from 0.4% in the worse situation to a 2.75% after using the multiple-transmission-coil method. This, to some extent, safeguards the wireless charging process from a large power drop to a much smaller power drop during possible random motions of the receiver. But, on the other hand, the improvements obtained from the proposed system in the normal high-efficiency situations are not very significant.

Download Full-text