All-Detuned LCC-S-S Three-Coil Wireless Power Transfer System for Rack-and-Pinion Modules

Yike Zhang, Guo Wei (), Xin Zhi and Hailong He
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Yike Zhang: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
Guo Wei: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
Xin Zhi: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
Hailong He: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China

Energies, 2025, vol. 18, issue 16, 1-18

Abstract: Wireless power transfer (WPT) technology offers a convenient, efficient, and environmentally robust power supply solution for rack-and-pinion modules. For WPT systems in such modules where the transmitter coil is a long rail, increasing the transmitter coil turns to enhance mutual inductance leads to issues like high cost, low efficiency, and installation difficulties. This paper introduces a relay resonator to strengthen system coupling and proposes a three-coil design scheme employing a single-turn long rail as the transmitter coil. The proposed all-detuned LCC-S-S topology exhibits constant output voltage (CV) and zero phase angle (ZPA) input characteristics while accounting for all cross-mutual inductances and coil resistances. The frequency detuning level of the relay resonator critically governs the system’s power transfer efficiency and directly determines the operational mode of the rectifier—either continuous conduction mode (CCM) or discontinuous conduction mode (DCM). To maximize system efficiency, the optimal detuning frequency of the relay coil is selected under CCM operation. Through optimized design of the three-coil parameters, the final prototype achieves an output power of 106.743 W and an efficiency of 90.865% when integrated with a 1200 mm single-turn long-rail transmitter coil.

Keywords: all-detuned design; three-coil power transfer; rack-and-pinion module; continuous conduction mode (CCM); wireless power transfer (WPT) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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