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Compensation for Lateral Misalignment in Litz Wire Based on Multilayer Coil Technology.

Hyungjun Chang¹, Taejun Lim¹, Yongshik Lee¹

¹Department of Electrical and Electronic Engineering, Yonsei University, Seoul 03722, Korea.

Sensors (Basel, Switzerland)

|April 3, 2021

Summary

Multilayer coil technology significantly improves wireless power transfer efficiency by compensating for lateral misalignment. This innovation enhances system performance in practical applications, even with asymmetric coil configurations.

Keywords:

lateral misalignment multilayer coils transfer efficiency wireless power transfer

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Area of Science:

Electrical Engineering
Electromagnetics
Power Electronics

Background:

Wireless power transfer (WPT) systems face efficiency losses due to coil misalignment.
Maintaining high transfer efficiency in practical WPT applications remains a challenge.
Lateral misalignment significantly degrades the performance of traditional WPT systems.

Purpose of the Study:

To investigate the effectiveness of multilayer coil technology in compensating for lateral misalignment in a 100 kHz-band WPT system.
To quantify the efficiency improvements achieved by the multilayer coil design.
To validate the technology's performance in both symmetric and asymmetric configurations.

Main Methods:

Fabrication of a WPT system utilizing multilayer coils made with Litz wires.
Experimental measurement of transfer efficiency under varying degrees of lateral misalignment (up to 30 mm).
Comparison of efficiency with and without the multilayer coil technology, and in asymmetric setups.

Main Results:

Multilayer coil technology compensated for up to 46.1%P of the efficiency loss at 30 mm lateral misalignment.
Significant efficiency compensation (37.6%P) was observed even when the multilayer structure was applied only to the transmitter (Tx) coil.
The study confirmed the practical effectiveness of multilayer coils in mitigating misalignment-induced losses.

Conclusions:

Multilayer coil technology is a viable solution for enhancing the robustness of wireless power transfer systems against lateral misalignment.
The proposed technology offers substantial improvements in transfer efficiency, making WPT more reliable in real-world scenarios.
Further research can explore optimization of multilayer coil designs for various WPT applications.