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.
In this study, a wireless power transfer system for miniaturized biomedical implants has been optimized for a 1mm-diameter receiver coil. This coil is wire wound around a 7.5 mm-long ferrite core and achieves a 3.56 μH inductance. For a distance of 10 mm between the industrial primary coil and the handmade secondary coil, measurements show a coupling factor of 3% and power transmission efficiencies...
This paper presents a novel design methodology to address range and misalignment intolerance in strongly coupled magnetic resonance wireless power transfer (WPT) systems. A nonlinear resonator circuit is developed to compensate for the effect of coupling factor (k) variation between the transmit and receive coils and thereby maintaining high efficiency of WPT system. Such a method is implemented with...
Omnidirectional wireless power transfer (WPT) system has been studied recently due to its better user experience compared with directional WPT system. And this paper focus on resonant converter topologies study in omnidirectional WPT system. At first, three challenges of resonant converter design are identified: I. moving resonant frequency under variable coupling condition; II. voltage controllability...
The data communication always needs to be implemented in application of the Wireless Power Transfer (WPT) technology. However, there are also some problems need to be dealt with in practical applications. For example, the interference between power transfer and communication is serious, when the power and data are transmitted through the same coupling coil. A simple design is presented to implement...
It is attractive to achieve multi-receiver wireless power transfer (WPT) through a megahertz operating frequency. However, the power distribution among receivers can be a difficult task due to the different load characteristics, i.e., power requirement, receiver size, and coupling coefficient. This paper proposes a general design methodology of efficiency optimization and power distribution of a MHz...
We present a power transmitter coil design for millimeter-size small wireless sensor nodes to improve coupling coefficient. We also develop a wireless power transfer (WPT) system using resonant coupling to achieve higher power transfer efficiency. Simulation results demonstrated that the power transfer efficiency was 60% at z-gap = 10 mm. Compared with conventional system, coupling coefficient was...
Implantable medical devices can benefit greatly from wireless inductive energy supplying. At the same time, there is no universal approach to the design procedure of inductive powering unit. This paper covers two possible operation modes of the unit. Each mode has its own specific features and area of applicability. Parametric sweeps of the system output power and energy transfer efficiency are depicted...
It has long been a significant challenge to improve the performance of flexible wireless power transfer. This paper proposes a novel controlled resonance power architecture for use in weakly coupled systems with less power processing stages, and investigates the basic design principles and implementation in power management ICs. Experiments show efficiency improvements in the range of 20–30% in practical...
Wireless power charging powers the storage device without any cords which makes the device more compact, water proof, easy to use and provide even more comfort. The efficiency of power transfer depends on many factors, few of them are quality factor of the inductor coil, coupling coefficient, distance between receiver and transmitter coil, impact of core used for the coil. This paper discusses about...
Wireless power transmission concept has being revolutionary emerging against the conventional charging methods of consumer electronics. In this paper, we present the concept of wireless power transmission for multiple devices. Simultaneous wireless power transmission via resonant inductive coupling is experimentally demonstrated for a system with single transmitter and two receivers. Resonance between...
This paper describes the characteristics of magnetic resonant coupling at 27.12 MHz for low voltage wireless power transfer system (WPT). Based on spiral magnetic inductance coupling, four single layer air coils are mutually coupled and parameterized to represent power coil, transmitter, receiver and load. The system was simulated using electromagnetic full wave simulator and analysis was performed...
The technological innovation in flexible electronics has been remarkable during the last few years. On the other hand, wireless power transfer (WPT) appears as one of the emerging area of research in the last decade. This paper presents an experimental study on a resonant WPT system having a receiver coil fabricated on flexible substrate. Two different cases of bending applied to flexible coil are...
Resonant Inductive Coupling Wireless Power Transfer is a key technology to provide an efficient and harmless wireless energy channel to consumer electronics, biomedical implants and wireless sensor networks. However, current applications are limited to point-to-point links and do not explore the capabilities of Multi-Node Resonant Inductive Coupling Wireless Power Transfer Systems. In such a system,...
An important challenge in wireless power transfer systems based on resonant coupling is the frequency splitting phenomenon, which results in detuning the resonance frequency of the system and consequently in a reduction in the system power transfer efficiency. In this paper, a software-defined, near-field wireless power transfer (WPT) platform is proposed where a particle swarm optimizer (PSO) is...
This paper presents some questions and answers on the wireless power transfer. Firstly, it investigates the physical limitation of a wireless power transfer using spherical modes. It is found that there is a limitation on the transfer efficiency depending on the distance between the resonators and efficiency of antennas. Secondly, we compare the performance of WPTS with respect to the source type...
In this paper, the design and hardware realization of a 3.5kW inductive power transfer system to charge electric vehicles is presented. The commercial success of such a wireless charger is highly dependent on the energy conversion efficiency. The presented design consists of a circular receiver coil mounted on a car and a larger circular transmitter coil fixed to the ground. It achieves an efficiency...
In this paper, we present the analysis of electrostatic discharge (ESD) effects in wireless power transfer (WPT) using magnetic resonance coupling. For analyzing ESD effects, we use the simple equivalent circuit model which consists of self-inductance, mutual inductance, parasitic resistance, and capacitance. The ESD pulse is generated by the model of an ESD generator. The generated ESD pulse is injected...
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...
This paper presents the research work focusing on charging the energy via the air to a small electric vehicle (EV). This work shows not only the possibility of wireless power charging, but also the electromagnetic compatibility (EM C) issue is taken into account. The charging system is described and set up using the resonance coupling effect and single-ended primary-inductor converter (SEPIC) for...
In this paper, a ranging technique based on inductive coupling between resonating coils is presented. The theoretical background is discussed, and a practical implementation is illustrated and experimentally validated. It is shown that the proposed technique, implemented using off the shelf components, features both a good range and a fair resilience to multipath, being suitable for indoor positioning...
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.