Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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A loosely coupled transformer structure with anti-offset capability based on uniform magnetic field

  • Yufei Zhou (College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics) ;
  • Yu Yan (College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics) ;
  • Dongdong Li (Zhejiang EV-Tech Co., Ltd) ;
  • Yang Luo (College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics)
  • Received : 2023.09.30
  • Accepted : 2024.03.10
  • Published : 2024.08.20
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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.

Keywords

Acknowledgement

This work was supported by the Research and Practice Innovation Program of Nanjing University of Aeronautics and Astronautics under grant xcxjh20230415.

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