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Inductive Power Transfer (IPT) techniques are gaining more and more interest in wireless power systems. The knowledge of the coupling factor of transmitter (TX) and receiver (RX) coil is a crucial, but mostly during operation not available parameter for such systems. In this manuscript a novel method to determine the coupling factor by measuring the self-resonating frequency of the postringing signal...
Intermediate couplers have been shown to increase the coupling from primary to secondary pads in inductive power transfer (IPT) systems. This paper investigates embedding a co-planar intermediate coupler coil, with the primary coil inside the primary pad, to boost coupling to the secondary pad given there have been recent works indicating this will have similar benefits. Several coil designs are simulated...
The misalignment of the transmitting and receiving coils in a wireless inductive link can degrade the link efficiency and limit the amount of power transfer. A coil structure, which is composed of two orthogonally-placed windings for the receiver, will be presented. Such structure lessens the variation of the coupling between the transmitting and receiving coils under coil misalignment. A canonical...
Conventionally, in wireless power transfer (WPT) system, all resonators are set at exactly the same resonant frequency, which is considered as the optimal operation condition to achieve resonant coupling. However, at over-coupled region, frequency split issue occurs, as a result, the frequency for the maximum power is not coincident with the frequency for the maximum efficiency. This deteriorates...
In this paper we propose a possible solution to increase the readability range of an inductive coupled based radio frequency identification (RFID) system. The solution is based on the introduction of a resonant printed spiral coil (PSC) in between the reader and the tag in order to enhance the magnetic field and therefore increase the detection range of the RFID reader. The results obtained proved...
This paper proposes an inductive coupled wireless power transfer (WPT) system with class-E2 dc-dc converter along with its design procedure. The proposed WPT system can achieve high power-conversion efficiency at high frequencies because it satisfies the class-E zero-voltage switching and zero-derivative-voltage switching conditions on both the inverter and the rectifier. By using the class-E inverter...
An inductively coupled near-field wireless power transmission system, consisting of transmitter and receiver coils connected via appropriate impedance matching network to source and load respectively, is analyzed to address how the properties of antennas and impedance terminations impact on the performance of such a system. This is achieved by deriving the power transfer relationship of inductively...
This in order to overcoming the disadvantages of the traditional precision locating system, this paper shows A precision locating System Driven by VCM(Voice Coil Motor). The coupling characteristics of the mechanical and electrical systems of the locating is thoroughly analyzed, and the transfer function model is founded. The three predictive compensation method is used to cut down the error of the...
Optical microcoil resonators are a new resonator design with several unique and attractive features. Practically they can be made by coiling a tapered fibre around a central rod so that light in each turn of the fibre can couple to the fibre directly above or below it. Importantly it is the coupling of light from one coil to the coil directly below that allows for the creation of effective high Q...
The capacity performance of the inductively coupled near field communication system in free space is analyzed based on the equivalent circuit model of the system and the information theory. The analytical results provide good guidelines about the estimation of the capacity performance and the antenna design for an inductively coupled near field communication system.
It is well known, actual trend in power electronics about exchange power thyristors with devices more flexible from point of view of commutation and possibility of command (IGBT, MOS transistors, GTO). There are applications, for example, DC high voltage electrical energy transmission, where because of high power switched, power thyristors remain an efficient solution. In this paper, is presented...
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