A Control of a z-Axis Rotation-Tolerant Wireless Power Transfer System Using a Double DD Coil

Domajnko, Jure; Prosen, Nataša

doi:10.3390/electronics12030606

Electronics

2023

DOI: 10.3390/electronics12030606

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A Control of a z-Axis Rotation-Tolerant Wireless Power Transfer System Using a Double DD Coil

Jure Domajnko

Nataša Prosen

Abstract: This paper describes the control of a wireless power transfer system using a double DD coil structure, when the transmitter and the receiver coil are rotated to one another. WPT systems using single DD coils are rotationally dependent, due to the directional magnetic field generated by the DD transmitter coil. This rotational dependance can be mitigated by using a different transmitter structure. One such possibility is the usage of the double DD coil on the transmitter and the receiver sides. A double DD coil… Show more

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Cited by 2 publications

References 19 publications

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Optimized Resonant Network Design for High Energy Transfer Efficiency of the WPT System

Diao

Mei

et al. 2023

Electronics

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This paper proposes an active resonant network based on variable resonant capacitances to improve the operating performance of the LCC-S compensated topology in the wireless power transfer (WPT) system for electric vehicles under coil-misaligned conditions. By adjusting the series and parallel compensation capacitances on the transmitting side, the output voltage can be kept constant and the energy transfer efficiency can be improved under different coil offsets. The switch-controlled capacitors (SCCs) are used to change the compensation capacitances continuously. To find the proper compensation capacitances to achieve the excellent performance of the system, the optimization algorithm is applied, and the corresponding digital control strategy is described to regulate the equivalent capacitances of SCCs. Experimental results with a 2.7 kW power scale show that the output voltage is constant, and the operating efficiency is always over 90% in the WPT system with an active resonant network under different misalignment conditions. In addition, the system is delivering an equal amount of energy for all misalignments within the range of 80 mm, which improves the expected value of transferred energy by about 29%.

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Optimized Resonant Network Design for High Energy Transfer Efficiency of the WPT System

Diao

Mei

et al. 2023

Electronics

View full text Add to dashboard Cite

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A z-Axis-Tolerant Inductive Power Transfer System Using a Bipolar Double D Receiver Coil Structure

Domajnko,

Prosen

2023

Electronics

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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.

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A Control of a z-Axis Rotation-Tolerant Wireless Power Transfer System Using a Double DD Coil

Cited by 2 publications

References 19 publications

Optimized Resonant Network Design for High Energy Transfer Efficiency of the WPT System

Optimized Resonant Network Design for High Energy Transfer Efficiency of the WPT System

A z-Axis-Tolerant Inductive Power Transfer System Using a Bipolar Double D Receiver Coil Structure

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