A loosely coupled transformer structure with anti‑offset capability based on uniform magnetic field

Yufei Zhou; Yu Yan; Dongdong Li; Yang Luo

A loosely coupled transformer structure with anti‑offset capability based on uniform magnetic field

Vol. 24, No. 8, pp. 1308-1319, Aug. 2024

10.1007/s43236-024-00799-0

ICPT

DDS–DS

Hybrid winding

Uniform magnetic field

Anti-offset

Abstract

Inductively coupled power transfer (ICPT) technology is widely used in wireless charging systems because of its safety, convenience, and reliability. However, the loosely coupled transformer, the most significant part of an ICPT system, has misalignment conditions in practical applications, which have a negative effect on the efficiency of the ICPT system. This paper proposes a new loosely coupled transformer structure, where the primary side is composed of two hybrid winding D coils and a solenoid coil, and the secondary side consists of a D coil and a solenoid coil, which is referred to as a “double-D solenoid coil–D solenoid coil” (DDS–DS). The hybrid winding D coils, which are composed of multiple layers of windings, can construct a uniform magnetic field at the operational air gap. The S coil is added to the primary and secondary sides of the transformer to build a mutually perpendicular energy channel with the D coils, which compensates the coupling valley without introducing cross-coupling. Therefore, the DDS–DS structure can construct a wide uniform magnetic field and effectively improve the anti-offset capability of the system. Finally, an experimental prototype is established, and the effective charging width reaches 78% of the transmitting coil's width with a 50 mm operational air gap, which verifies that the structure has good anti-offset capability.

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Cite this article

[IEEE Style]

Y. Zhou, Y. Yan, D. Li, Y. Luo, "A loosely coupled transformer structure with anti‑offset capability based on uniform magnetic field," Journal of Power Electronics, vol. 24, no. 8, pp. 1308-1319, 2024. DOI: 10.1007/s43236-024-00799-0.

[ACM Style]

Yufei Zhou, Yu Yan, Dongdong Li, and Yang Luo. 2024. A loosely coupled transformer structure with anti‑offset capability based on uniform magnetic field. Journal of Power Electronics, 24, 8, (2024), 1308-1319. DOI: 10.1007/s43236-024-00799-0.