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Wireless power transfer has been introduced as a proper replacement for conventional cable power transfer systems recently. With the developments of the electric transportation, transferring power wirelessly has been found to introduce several advantages in charging Lithium-Ion batteries. Among different configurations of wireless power transfer, Series Parallel structure is found to be more interesting...
Resonant energy link plays a vital role in the performance of inductive wireless power transfer (IPT) system, whereas the effective design method has not been actively investigated from a perspective of power conversion circuit. This paper presents a new graphical design method based on FOM-rd plane which gives convenience as well as insight to circuit designers. The proposed FOM-rd plane can estimate...
The majority of wireless power transfer (WPT) systems transfer power in a directional manner. Recently, omni-directional WPT systems have been addressed by several research groups. This paper describes a discrete exciting voltage control technique for wireless power transfer via magnetic resonant coupling with multiple orthogonal transmitter coils which can maximize the power transfer efficiency in...
A maximum power point (MPP) tracking technique for electromagnetic energy harvesters is presented. The concept is based on using a bidirectional AC/DC converter to simultaneously counteract the effect of the output inductance and match the output resistance of the harvester, in order to perform maximum power transfer. The modulating signal for the AC/DC converter is generated by sensing and processing...
A study is presented on the magnetic field produced by a wireless power transfer (WPT) system installed in an electric vehicle (EV). The considered WPT charging system operates at the frequency of 85 kHz with an output power of 22 kW. The magnetic field levels are numerically calculated. In the simulations the presence of the conductive bodyshell of the vehicle is taken into account. The magnetic...
The model of mismatched transceiver coils in wireless power transfer system is proposed in this paper. System transmission efficiency and transferred power are analyzed against coupling coefficient. The mismatched charging scenario and ways to achieve optimal charging are investigated based on theoretical analysis and validated by experiment results.
The present text provides information regarding introductory concept of wireless power transfer by studying some of the existing technologies and evaluate its quality factor as well as deals with certain methods of improving the efficiency of wireless power transfer. In addition to this, calculation and analysis has also been done for its figure of merit, transfer loss, quality factor and efficiency.
To transfer large power in inductively coupled power transfer (ICPT) system, parallel secondary pickups are adopted. Because of the error of installation and measure, the parameters of parallel pickup modules are not completely consistent, resulting in the current unbalance or even over- current in parallel modules, which will damage the elements like resonant capacitance, even destabilize the system...
The purpose of this paper is to design a practical flux density observer which provides the accurate magnetic flux density signal for the flux feedback control of electromagnet-permanent magnet (EM-PM) hybrid suspension system in maglev train. Firstly, the property of two basic kinds of flux observers based on current model and voltage model are discussed. To improve the design of the observed flux...
A practical application of multi-physics simulations was presented. In order to analyse thermal stability of MEMS micro scanner, multi-physics simulation procedure was proposed and then verified by comparing the simulated results to the measured data. The proposed procedure started from defining simulation parameters and was verified stepwise by comparing the interim results with the related experimental...
Distance and frequency variation are the main causes for dramatic decrease of the output power and efficiency in wireless power transfer system. The influence of these parameters should be considered from the design stage. This paper investigates the effect of distance and proposes a method to estimate the distance with maximum output power for air-core coils. The effect of operating frequency focused...
This paper presents a design procedure of a Class E2 DC-DC converter for megahertz wireless power transfer. The design formulas are analytically derived based on the input impedance of the Class E rectifier. A 6.78 MHz Class E2 DC-DC converter is designed and implemented by means of those formulas. The power-level of the converter is 15W. The experiments are provided to verify the proposed design...
The purpose of calculation of parameters of magnetically coupled coils using Ansoft Q3D Extractor program is to find out the electric parameters: R, L, C and G.
This paper analyzes and simulates the electromagnetic interaction between multiple inductive power transfer (IPT) systems for electric vehicle charging applications. A simple car model is built up in 3D Maxwell simulation to reduce simulation time and calculate leakage magnetic field between two cars. The impact of phase difference between two IPT systems is investigated. Passive shielding methods...
Different compensation topologies of electric vehicle (EV) inductive power transfer (IPT) charging system in terms of transfer efficiency, required input voltage and input current, are compared and analyzed. Three compensation topologies are analyzed, namely series-series (SS), double-sided inductor-capacitor-capacitor (LCC-LCC) and double-sided capacitor-capacitor (CC-CC) topologies, at two mutual...
We deal with the numerical model of overheating of primary and secondary coils of voltage instrument transformer. Calculated values are compared with two different measuring methods — measuring with thermal sensors and calculation of heating from measured resistance. All calculations are solved in three operating conditions by rated voltage, thermal limiting output and rated voltage factor 1.9 Un...
For the battery/super-capacitor hybrid system as the wireless power transfer system load, it is rarely discussed. In this paper, the characteristics of such a system are considered, a charging topology is proposed. And a control strategy is proposed to not only meet the requirements of the system energy output, but also maintain the high efficiency of the system based on rational design of power allocation...
The improvement of the coil quality factor results to a higher efficiency for wireless power transfer(WPT) system[1–3]. Additionally, adding a suitable magnetic core into the coil can effectively enhance the mutual inductance and improve the efficiency of WPT system[4–7]. The high frequency current is un-uniform in the wire due to the external magnetic field. As a result, the conductive area of the...
This paper proposes a Q-enhancement method to improve the quality factor of coils in a resonant inductive coupling wireless power transfer system (WPTS). The proposed WPTS increases the transfer power and the transfer efficiency, simultaneously, especially at transfer distance over the coil diameter. The proposed Q-enhancement method is verified both by calculation and simulation results, which match...
Recent developments in high frequency inductive wireless power transfer (WPT) mean that the technology has reached a point where powering small autonomous drones has become feasible. Fundamentally, drones can only carry very limited payloads and thus require light-weight WPT receiver solutions. The key to achieving light weight is operating the WPT system at high frequency: this allows both the coils...
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