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.
Multiple dipole receiving (Rx) coils, which are applicable to ubiquitous mobile device charging applications, are newly proposed in this paper. By using the proposed Rx coils, any mobile devices equipped with the proposed Rx coil can be freely charged regardless of direction anywhere and at any time in wireless power zone, where a uniformly distributed magnetic flux environment is provided for wireless...
This paper presents a new wireless power transfer topology for electric vehicle (EV) charging application. The main emphasis is given on high frequency DC-AC and AC-DC wireless power transfer stage where the inversion stage is current fed topology. The required resonance in transmitter side is C-C-L type and in the receiver side series L-C type. Inductor in dc-link provides short circuit protection...
In this contribution the concept of a multi-tap transformer topology for SS-compensated Inductive Power Transfer (IPT) systems is proposed. The objective is an improvement in terms of overall efficiency and maximum tolerable misalignment of the secondary transformer coil that is assumed to be mounted underneath an electric vehicle (EV). In a first step mathematical expressions are derived to describe...
Crossed dipole coils for the wide-range 3-D omnidirectional inductive power transfer (IPT) are proposed. Free positioning of a plane receiving (Rx) coil is obtained for an arbitrary direction within 1m from a plane transmission (Tx) coil. Both the Tx and Rx coils consist of crossed dipole coils with an orthogonal phase difference; hence, a rotating magnetic field is generated from the Tx, which enables...
Solving a short mileage and a long charging time is indispensable to putting electrical vehicles (EVs) on the full-scale market. A moving wireless power transfer (WPT) system is one of the effective solutions, because it can feed electric power to moving EVs. This paper proposes a moving WPT system consisting of several stationary ground-side (primary) coils and a moving vehicle-side (secondary) coil...
In this paper a highly reliable and compact inverter is proposed. This inverter is capable of both stepping up and stepping down the voltage and can be used for inductive wireless power transfer. The proposed inverter is an extension of the dc-dc Ćuk converter; therefore, a capacitor that forms the link is responsible for transferring the power from the input towards the output. The converter is designed...
This paper describes mid-range electrical resonance wireless power transfer in kHz range. Wireless power transfer using electrical field is minor since this method is understood only for close-range applications. However, our experimental units, the resonance frequency of which is 85 kHz, achieved 180 mm distance power transmission by vector network analyzer (VNA) measurement while keeping peak efficiency...
Wireless battery charger system architecture equipped with adaptive multi-phase rapid charging algorithm based on a simplified electrochemical battery model is proposed. Excellent rapid-charging performance operated with the proposed wireless charging platform has been experimentally verified to show more than 70% charging time reduction compared to conventional constant-current constant-voltage (CC-CV)...
A novel coil design approach for an indirect-fed resonant wireless power transfer (RWPT) system is proposed in this paper. The design goal is to find the minimum size of the coils for the RWPT to deliver a minimum desired power in all positions in a given distance range. Neumann formula is applied to the extensions of circuit models to obtain dimension-bound equations for output power. The design...
Integrated charger topologies that have been researched so far are with the dc-dc converters and the charging functionality usually have no isolation in the system. Isolation is an important feature that is required for user interface systems that have grid connections and therefore is a major limitation that needs to be addressed along with the integrated functionality. This study features a unique...
Traditional in-motion (dynamic) wireless power transfer (WPT) is based on elongated power transmitting tracks. It suffers from low efficiency, having complex and not fully utilized magnetic structures, among other drawbacks. In the case of lumped transmitter coils commeasurable in size with the receiver coil, which has been recently proposed for the in-motion WPT, the power transfer is intermittent...
Transmitting and receiving resonators for 7 kW-class wireless power transfer/transmission (WPT) systems operating at 85 kHz have been developed for contactless Electric Vehicle (EV) / Plugin Hybrid EV (PHEV) charging. The light weight and small volume of the on-board receiving resonator to be mounted on the vehicle are required attributes. A thickness and a shape of the core in the resonance coil...
Medium-voltage motor drive systems, medium-voltage inverters, which have an input voltage and an output voltage of 3.3 kV or 6.6 kV, are widely used in industry applications. In the medium-voltage inverter, robust galvanic isolation among a control circuit and each gate drive supplies is required in order to drive high-voltage switching devices. In present, a transformer, which is designed to satisfy...
Socially Interactive Robots (SIR) have many applications in rehabilitation, including psychological development of children with autism, children with complex neuro-developmental motor impairments, adults with dementia, etc. The animal-shaped or toy-shaped SIR should help engaging such individuals in physical and communication interaction, while any human presence during such sessions is typically...
This paper presents a mathematical analysis on 2-dimensional omni-directional wireless power transfer. It is shown that with the use of current control in the transmitter coils, magnetic field vector can be generated to point at all directions in a 2-dimensional sense. The theory allows the equations of the total input power and output power of the system to be determined at all angles of input magnetic...
Misalignment in wirelessly charged electric vehicles is unavoidable as perfect alignment of the pickup coil on the electric vehicle with respect to transmitter is quite difficult. Notably, even a small coil misalignment leads to significant reduction of the effective coupling. Due to which this problem is of quite significance for maintaining high efficiency over the complete misalignment range. This...
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.