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Presents the introductory welcome message from the conference proceedings. May include the conference officers' congratulations to all involved with the conference event and publication of the proceedings record.
This paper presents a new transmitting array of magnetically-coupled resonance system for multi-receiver wireless power transfer systems. It consists of several resonant coils driven by a single source loop. Our analysis shows that it can deliver power wirelessly to multiple receivers evenly and automatically without any control circuits with a relatively high power transfer efficiency. The proposed...
A new coil optimization procedure is proposed for inductively coupled wireless power transfer when square single-turn printed coils are used, by means of analytically modeling the self- and mutual-inductances, parasitic resistances, and parasitic capacitances of these coils. As an example, the average diameter and trace width of the transmitting coil and the trace width of the receiving coil are optimized...
In this paper, a compact quasi-isotropic antenna with enhanced bandwidth for radio frequency (RF) energy harvesting applications is presented. The quasi-isotropic pattern is achieved using split ring resonators (SRRs) and the folded dipole structure. Two folded split ring resonators (FSRRs) are implemented orthogonally to reduce the mutual coupling, and each resonance is placed closely to widen the...
This paper presents the design, implementation and experimental results of an energy harvesting system to extract energy from power transmission lines. The energy is extracted from a high permeability core clamped on a high alternative current cable. A coil wound on the magnetic core can harvest energy effectively from the power line when the core is operating at the non-saturation region. Little...
A new magnetic resonance wireless power transfer (MRWPT) system is proposed in this paper. The proposed MRWPT has a current source transmitting resonator and a voltage source receiving resonator. Also, a LC compensated half bridge inverter is used for a 6.78MHz power amplifier. The LC compensated half bridge inverter helps electromagnetic interference be suppressed and makes a zero voltage switching...
A wideband slot rectenna is designed for wireless power transmission operating at the WLAN 2.45 GHz band in this study. The rectenna consists of a planar wideband slot antenna and a rectifying circuit. The rectenna is fabricated on a cheap FR4 substrate with a compact size of 45 mm by 67 mm. Results of the designed rectenna show that good agreement between simulated and measured reflection coefficients,...
This paper presents an inductive power transfer system for implantable medical devices. The system features a DC/DC converter in transmitting side, and a load voltage monitoring circuit in receiving side, plus a communication mechanism that utilizes the power coils. The load voltage monitoring circuit detects the voltage on the load and once it is out of nominal range, an alert is sent to the transmitter...
In this paper, we propose and analyze a smartwatch strap wireless power transfer (WPT) system using flexible PCB coils and magnetic field shielding materials. To ensure the sufficiency power delivery, we addressed the changes in impedance of the curved WPT coil system using 3D EM simulation and Z-parameter analysis. Using the proposed scheme, we achieved coil to coil power transfer efficiency of 50%.
Used as the transmitting and receiving elements, coils are the most popular elements for wireless power transfer. The parasitic coil or LC booster coil has been used as the part of the receiving element and reported to be effective to increase the wireless Power transfer efficiency so far. In this paper, the maximum transfer efficiency of the wireless power system by using parasitic coil will be calculated...
This paper describes the 2.4 GHz band SOI-CMOS bridge rectifier for sub-W class rectification. The bridge rectifier topology is suitable for IC integration because of full-wave-rectification without large sized filters. Furthermore, to realize high power operation, the series connected gate connected diodes made by NMOS FETs are employed for higher breakdown voltage. And the LPF is added to reduce...
For wireless power transfer (WPT) systems transferring high power, both high efficiency and low magnetic field leakage have been regarded as the main design objectives to be achieved. For the first time, in this paper, we propose a new concept of hybrid loop-array structure and its design procedure to achieve high efficiency and low magnetic field leakage simultaneously in high-power WPT system. The...
We proposed a transcutaneous energy transmission system (TETS) for implantable ventricular assist devices (VADs) in order to improve the quality of life (QOL) of patients. In a conventional TETS, the patient must accurately and tightly fix a rigid coil on his body surfaces because the transmission efficiency remarkably depends on the alignment accuracy of the coil. In order to improve the robustness...
This paper presents the design of a nonlinear wireless power transfer receiver. In the proposed receiver, a switch is introduced to control the quality factor of the impedance at the power receiving interface. The effective impedance can then be adjusted by jointly varying the switching timing and DC loading to deliver the required power while improving the conversion efficiency at the same time....
Wireless power transmission system has been developing rapidly in recent years, and its application is becoming more and more extensive. In order to enhance the stability of the system operation, the communication module used in the transmitting and receiving terminals must be added to the system operation. The paper realizes the receiver and the transmitter chip to execute the signal transmission,...
In recent years, wireless sensor network technique develops rapidly, but its operation life is still limited by the energy storage element. Thus, if ambient energy can be harvested to supply the sensors, the operation life can be increased and the cost can be reduced. A boost converter for indoor photovoltaic energy harvesting with low power consumption is proposed in this work. For harvesting energy...
In this paper, we present an impedance matching technique in magnetic-coupling-resonance wireless power transfer system for small implantable medical devices. By developing an equivalent circuit model of the WPT system, we show that impedance matching can be realized. Electromagnetic field simulations demonstrated that our proposed technique has capability of achieving maximum input power and available...
This paper describes data transmission system using magnetic resonance wireless power transfer (MR-WPT). A MR-WPT is a method of transferring electrical energy through space by driving the system at resonant frequency of the resonator. In this method, when the driving frequency deviates from the resonant frequency, the transmission efficiency is dramatically decreased. This problem can be solved by...
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