The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The operation of wireless power transfer systems (WPT) with a single relay, which could charge one or multiple receivers simultaneously, is investigated. Besides, a new method for ensuring the optimized transfer efficiency and the output power by configuring the operating frequency is presented, even when the coupling coefficients between all the coils are very small. An issue of concern is that the...
This paper compares the characteristics of serial, parallel and LCC compensation topologies of secondary-side in wireless powering systems with a constant-current primary-side. The topologies characteristics of power, efficiency and load are carefully analyzed and detailed presented. And the correctness of theoretical analysis is verified by simulations. This study results can guide the selection...
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 proposes a design method of the wireless power transfer system which obtains high power and high efficiency by using LC filter circuit in the transmitting side. This study forcuses on the maximum efficiency point of impedance. In the simulation, the proposed design achieved 2.5kW output power with the efficiency of 73%. In the experiment, the proposed circuit achieved 1.8kW wireless power...
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...
This article proposes the design and implementation of the class E power amplifier with parallel circuit for wireless power transfer systems. The high power efficiency of the class E power amplifier with parallel circuit provides small circuit by reducing cooling systems and using low inductance of a DC-feed inductor. Furthermore, the parallel circuit provides wideband operating frequency that makes...
Class EF inverters are hybrid inverters that combine the improved switch voltage and current waveforms of Class F and Class F−1 inverters with the efficient switching of Class E inverters. As a result, their switch voltage and current stresses are reduced, and their efficiency, output power and power-output capability can be higher than the Class E inverter. These improved features of Class EF inverters...
Tremendous progress has been achieved in the field of wireless power transfer in last few years. Several methodologies have been adopted to transfer power across large air gaps with high efficiency. We demonstrated here nonradiative magnetic coupling to improve the transfer distance for wireless power transfer system where grid connection is inconvenient and hazardous. How much energy is being transferred...
This research focuses on Wireless Power Transfer (WPT) systems, especially the inductive coupling type. The WPT systems applied to the battery charger system of Electric Vehicle (EV) and Plug-in Hybrid Vehicle (PHV) are investigated. In this application, it is necessary to keep the inductive coupling coils at a short distance and set the coils appropriately in order to achieve high transmission efficiency...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.