Multi sub-coil flux pipe couplers and their use in a misalignment-adaptive wireless power transfer system

Sis, Seyit Ahmet; Kiliç, Fuat; Sezen, Serkan

doi:10.1080/09205071.2019.1652117

Cited by 5 publications

(5 citation statements)

References 16 publications

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“…The DD coil structure is named after its unique shape-the coil is composed of two square or rectangular coils that are connected in series. The DD coil generates a directional magnetic flux along one of the axes-similar to a flux-pipe-type coupler [23][24][25][26]. The main advantage of the DD coil is better misalignment tolerance compared to the nondirectional planar coils.…”

Section: Dd Planar Coil Measurement Resultsmentioning

confidence: 99%

3D Platform for Coupling Coefficient Evaluation of an Inductive Power Transfer Systems

Domajnko

Milanovič

Prosen

2022

Sensors

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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.

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Section: Dd Planar Coil Measurement Resultsmentioning

confidence: 99%

3D Platform for Coupling Coefficient Evaluation of an Inductive Power Transfer Systems

Domajnko

Milanovič

Prosen

2022

Sensors

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“…The flux-pipe coupler utilized in this experiment is basically a helical structure with three sub-coils wound around a common ferrite core (Figure 5 (b)). The detailed simulation and measurement results of this coupler structure are out of scope of this paper and are reported elsewhere [12]. The list of component values and other details for the experimental setup are shown Table 1.…”

Section: Experimental Setup and Measurement Resultsmentioning

confidence: 99%

“…However, this method may become unstable if there is no resonance in the system. In another work [12], which is published by the authors of this manuscript, a fluxpipe coupler structure with three movable sub-coils is exploited for realizing an adaptive WPT system. The inductance value of the coupler is tuned by moving the position of the sub-coils to get back the system's resonance frequency shifted by the coupling variations.…”

Section: Introductionmentioning

confidence: 99%

“…The inductance value of the coupler is tuned by moving the position of the sub-coils to get back the system's resonance frequency shifted by the coupling variations. This solution, however, requires a complex mechanical mover and a dual side control [12]. In [13], authors propose a frequency tracking method based on simulated annealing algorithm for achieving maximum power transfer, but this algorithm is time inefficient and computationally dense [14].…”

Section: Introductionmentioning

confidence: 99%

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A misalignment-adaptive wireless power transfer system using PSO-based frequency tracking

Kiliç

Sezen

Sis

2020

Int. J. Optim. Control, Theor. Appl. (IJOCTA)

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One of the major challenges in inductive wireless power transfer (WPT) systems is that the optimal frequency of operation may shift predominantly due to coupling variation as a result of so-called frequency splitting phenomenon. When frequency splitting occurs, two additional resonance frequencies split from the coupler’s resonance frequency. Maximum power levels are observed at these split resonance frequencies; however, these frequencies are strongly-dependent on the coupling coefficient, hence the distance and alignment between the couplers. In addition to that, peak power values at these frequencies can be different from each other due to small impedance differences between the primary and secondary side resonant couplers, forming a local and a global maximum. Therefore, the WPT system should adaptively operate at the correct frequency for achieving maximum power transfer. In this paper, a metaheuristic Particle Swarm Optimization (PSO) based frequency tracking algorithm is proposed for use in WPT systems. The WPT system employs multi sub-coil flux pipe couplers, a full-bridge inverter which is driven by TMS320F28069 controller card and is suitable for high power charging applications. The control algorithm can accurately find the global maximum power point in case of frequency splitting with asymmetric peaks. The proposed frequency tracking algorithm operates only at the primary side based on measurement of the input power level. Therefore, no additional communication link is needed between the primary and the secondary side. Effectiveness of the proposed control method is validated by performing experiments under three different misalignment scenarios and compared to the traditional Perturb and Observe algorithm.

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“…In recent years, research on WPT has put forward many schemes to improve system stability. In [ 8 ], flux pipe couplers were added between transfer channels to improve system tolerance to coil offset. By comparing a multiloop system with a traditional two-loop system, the authors of [ 9 ] found that the transfer efficiency could be better maintained by adopting the former approach.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Stability of Medium Range and Misalignment Wireless Power Transfer System by Negative Magnetic Metamaterials

et al. 2020

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The misalignment of the resonant coils in wireless power transfer (WPT) systems causes a sharp decrease in transfer efficiency. This paper presents a method which improves the misalignment tolerance of WPT systems. Based on electromagnetic simulations, the structural unit parameters of the electromagnetic material were extracted, and an experimental prototype of a four-coil WPT system was built. The influence of electromagnetic metamaterials on the WPT system under the conditions of lateral misalignment and angular offset was investigated. Experiments showed that the transfer efficiency of the system could be maintained above 45% when the transfer distance of the WPT system with electromagnetic metamaterials was 1 m and the resonant coils were shifted laterally within one coil diameter. Furthermore, the system transfer efficiency could be stabilized by more than 40% within an angle variation range of 70 degrees. Under the same conditions, the transfer efficiency of a system without electromagnetic metamaterials was as low as 30% when lateral migration occurred, and less than 25% when the angle changed. This comparison shows that the stability of the WPT system loaded with electromagnetic metamaterials was significantly enhanced.

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Multi sub-coil flux pipe couplers and their use in a misalignment-adaptive wireless power transfer system

Cited by 5 publications

References 16 publications

3D Platform for Coupling Coefficient Evaluation of an Inductive Power Transfer Systems

3D Platform for Coupling Coefficient Evaluation of an Inductive Power Transfer Systems

A misalignment-adaptive wireless power transfer system using PSO-based frequency tracking

Enhancing the Stability of Medium Range and Misalignment Wireless Power Transfer System by Negative Magnetic Metamaterials

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