Analysis and design of tubular coils for wireless inductive power transfer systems

Acero, J.; Serrano, J.; Carretero, C.; Lope, Ignacio; Burdío, J.M.

doi:10.1109/apec.2017.7930795

Cited by 15 publications

(8 citation statements)

References 13 publications

(20 reference statements)

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“…With respect to the windings, few alternatives to litz wires have been proposed. PCB coil implementations [35], [36], hollow rectangular conductors [37], printed windings by means of inkjet technology [38], and copper tubes [39] are some examples.…”

Section: Introductionmentioning

confidence: 99%

Magnetizable Concrete Flux Concentrators for Wireless Inductive Power Transfer Applications

Carretero

Lope

Acero

2020

IEEE J. Emerg. Sel. Topics Power Electron.

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Wireless inductive power transfer (IPT) systems incorporate magnetic flux concentrators in order to improve some features, as coupling and efficiency, and also to reduce electromagnetic emissions. Usually, flux concentrators consist of ferrite cores, which are arranged according to the size and shape of inductive power pads and also according to the application. Ferrite is the most common magnetic material due to its optimal balance between performance and cost. Despite the availability of ferrite cores with a wide set of shapes and sizes, in some applications the optimal matching between inductive power paths and flux concentrators becomes problematic. In this work, magnetic cement concrete is evaluated as a size-adaptable material for the arrangement of flux concentrators of IPT systems. Both cement powder and concrete are magnetically characterized at different temperature, field level and frequencies, and measurements show that the achieved levels of permeability, Curie's temperature and losses make this material attractive for potential flux concentrator uses. A potential IPT application is evaluated by means of a finite element study and the results are applied to a prototype design. Feasibility of use of the magnetic cement is tested by means of different power pads according to different flux concentrator arrangements.

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Section: Introductionmentioning

confidence: 99%

Magnetizable Concrete Flux Concentrators for Wireless Inductive Power Transfer Applications

Carretero

Lope

Acero

2020

IEEE J. Emerg. Sel. Topics Power Electron.

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“…Then, regarding (19) and (33), the number of strands is obtained and rounded for the Tx and Rx, separately.…”

Section: A Optimization Algorithmmentioning

confidence: 99%

“…Step 6: The dc resistance of primary and secondary coils are obtained using equations (17) up to (19). Using the proposed equations (20) and (27) up to (31), the AC resistance is calculated.…”

Section: A Optimization Algorithmmentioning

confidence: 99%

Design Optimization of Inductive Power Transfer Systems Considering Bifurcation and Equivalent AC Resistance for Spiral Coils

et al. 2020

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This paper presents a design optimization algorithm for series-series compensated Inductive Power Transfer (IPT) system based on flat spiral coils, considering bifurcation phenomenon and AC equivalent resistance of the coils. Moreover, it finds the best values in the areas where the IPT system operates in Zero Voltage Switching (ZVS) condition. Equivalent AC resistance of spiral coils is modeled based on eddy currents simulations using Finite Element Method (FEM) and Maxwell simulator. Based on the FEM simulations, a new approximation method using separation of variables is proposed as a function of spiral coil's main parameters. This paper shows that this model accurately derive equivalent resistance of the coils for a specific strand diameter, with almost 95% accuracy. Based on the proposed algorithm, several IPT systems are optimized in MATLAB software using Genetic Algorithm (GA). Finally, the proposed method has been verified using a laboratory prototype with output power of about 200 watts and operating frequency of about 85 kHz.

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“…Equation (1) shows the maximum efficiencies of WPT system highly depend on the product of the magnetic coupling k and the Q [24]- [26]. where Q T and Q R are the quality factors for the transmitter coil and receiver coil respectively.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Wireless Power and Data Transmission Based on Unsymmetrical Current Waveforms With Duty Cycle Modulation

et al. 2020

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This paper proposes an active-clamped inverter (ACI) with duty cycle modulation for achieving simultaneous wireless power and data transmission (WPDT). The proposed method adjusts harmonic amplitudes by changing the duty cycle of the inverter, as a means to encode information alongside power using a shared wireless channel. This method generates a variable unsymmetrical current waveform corresponding with different duty cycles. By controlling the duty cycle, simultaneous power and data transfer can be achieved by using the fundamental and harmonic components respectively. The ACI is designed to operate in continuous current mode to reduce the variation of harmonic components, even under no load conditions. A simple ACI containing two switches is proposed to generate unsymmetrical current waveforms with a high efficiency and high circuit quality factor Q. Two communication methods are developed to balance the power transfer capability and signal-noise-ratio (SNR). Various separation distances and loads are tested, with experimental results showing the proposed system can achieve simultaneous power and data transfer across a shared channel in an inductive wireless power transfer.

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Analysis and design of tubular coils for wireless inductive power transfer systems

Cited by 15 publications

References 13 publications

Magnetizable Concrete Flux Concentrators for Wireless Inductive Power Transfer Applications

Magnetizable Concrete Flux Concentrators for Wireless Inductive Power Transfer Applications

Design Optimization of Inductive Power Transfer Systems Considering Bifurcation and Equivalent AC Resistance for Spiral Coils

Simultaneous Wireless Power and Data Transmission Based on Unsymmetrical Current Waveforms With Duty Cycle Modulation

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