1. 3D platform for coupling coefficient evaluation of an inductive power transfer systemsJure Domajnko, Miro Milanovič, Nataša Prosen, 2022, izvirni znanstveni članek Opis: This paper presents a custom-made, computer-connected, and controlled 3D platform that
enables the evaluation of the coupling coefficient between the transmitter and receiver coil parts of an
inductive wireless power transfer (IPT) system. The platform includes a computer application, a 3D
positioning mechanism, and an inductance measurement circuit. The positioning mechanism moves
the coils to the point in 3D space, and the inductance circuit measures the mutual inductance between
the transmitter and the receiver coil. The measured value can be used to calculate the coupling
coefficient between the transmitter and the receiver coil. The data are sent to the computer for further
visualisation. The transmitter and the receiver coil can be evaluated by measuring the coupling
coefficient between them in multiple points in space. Measurements performed with the platform
can be used in the design and evaluation phases of inductive wireless power transfer systems and to
extrapolate the polynomial function of the coupling coefficient in relation to the distance between
coils or their misalignment.
Ključne besede: coupling coefficient, inductance measurement, IPT coil design
Objavljeno v DKUM: 01.04.2025; Ogledov: 0; Prenosov: 3
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2. Magnetic flux density measurement platform for an inductive wireless power transmitter coil designNataša Prosen, Miro Milanovič, Jure Domajnko, 2022, izvirni znanstveni članek Opis: This paper presents a platform developed for automated magnetic flux density measurement. The platform was designed to be used to measure the magnetic flux density of the
transmitter/receiver coil of an inductive wireless power transfer system. The magnetic flux density
of a transmitter was measured using a small, 3-axis search coil. The search coil was positioned in
the 3D space above the transmitter coil using a 3D positioning mechanism and used to measure
the magnetic flux density at a specific point. The data was then sent to a computer application to
visualize the magnetic flux density. The measured magnetic field could be used in combination with
electromagnetic field solvers to design and optimize transmitter coils for inductive wireless power
transfer systems.
Ključne besede: magnetic field, magnetic flux density, IPT, transmitter coil design, EM solver
Objavljeno v DKUM: 01.04.2025; Ogledov: 0; Prenosov: 7
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3. Control of an inductive power transfer system using a double coil structureNataša Prosen, Mitja Truntič, Jure Domajnko, 2022, izvirni znanstveni članek Opis: This paper presents the design of the control of the system using a double DD coil structure.
The double DD coil is a layered coil structure that consists of two single DD coils, rotated to each other
by 90◦. A large-signal and small-signal model of the proposed IPT system are designed for control
synthesis. The small-signal model is derived from the large-signal using harmonic approximation
and the extended describing functions (EDF). For the small-signal model, voltage and current control
schemes were proposed for the purpose of wireless battery charging. The robustness of the control is
tested on a small-scale IPT system using double DD coils and resistive load. The results are evaluated
at different reference voltages, currents, loads and coupling coefficients.
Ključne besede: wireless power transfer, double DD coil structure, voltage control, IPT with multiple coils
Objavljeno v DKUM: 28.03.2025; Ogledov: 0; Prenosov: 7
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4. A z-axis-tolerant inductive power transfer system using a bipolar double d receiver coil structureJure Domajnko, Nataša Prosen, 2023, izvirni znanstveni članek Opis: This paper presents a solution to a limitation of wireless power transfer that arises when using two D-shaped transmitter and receiver coils. Double D, or DD, coils are well known to have a polar, directional magnetic field, which increases the misalignment tolerance in one of the directions. The misalignment tolerance is nonsymmetric, and it is significantly better in one of the directions, which can also be considered a shortcoming. An additional shortcoming of the DD coil is that it is dependent on the rotation around the z-axis, due to the directional magnetic field. This is not a problem when using classic planar spiral coils, which do not generate a directional magnetic field. Therefore, DD coils are not suitable for applications in which the z-axis orientation is not determined and fixed to specific angle and direction. This paper presents a unique design of a transmitter coil, based on a double DD coil. The transmitter coil consists of two DD coils which are perpendicular to each other. The proposed transmitter structure can excite the receiver DD coil in a way that the efficiency of the power transfer is the highest, regardless of the orientation. The proposed transmitter structure can, therefore, solve the problem with rotation of a single DD coil. The proposed system structure was tested on the small-scale experimental setup
Ključne besede: coil rotation, orientation detection, DD coils, IPT
Objavljeno v DKUM: 20.12.2023; Ogledov: 331; Prenosov: 32
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