Optimal Range of Coupling Coefficient of Loosely Coupled Transformer Considering System Resistance
Keywords:Wireless power transfer system (WPTS), system resistance, system efficiency
Accurate system resistance may lead to an obvious error between the simulated and the real efficiency of the system. This paper proposes an optimal range of coupling coefficient for ensuring the efficiency and the sufficient output power of the WPT (wireless power transfer) system. A 3-kW prototype WPT system is manufactured and the effectiveness of the optimal range of coupling coefficient is validated.
Z. Luo, and X. Wei, “Analysis of square and circular planar spiral coils in wireless power transfer system for electric vehicles,” IEEE Trans. Ind. Electron., vol. 65, no. 1, pp. 331-341, Jan. 2018.
M. Kim, D. M. Joo, and B. K. Lee, “Design and control of inductive power transfer system for electric vehicles considering wide variation of output voltage and coupling coefficient,” IEEE Trans. Power Electron., vol.34, no. 2, pp. 1197-1208, Feb. 2019.
Y. J. Wang, Y. S. Yao, X. S. Liu, D. G. Xu, and L. Cai, “An LC/S compensation topology and coil design technique for wireless power transfer,” IEEE Tran. Power Electron., vol. 33, no. 3, pp. 2007-2025, Mar. 2018.
D. H. Tran, V. B. Vu, and W. Choi, “Design of a high-efficiency wireless power transfer system with intermediate coils for the on-board chargers of electric vehicles,” IEEE Trans. Power Electron., vol. 33, no. 1, pp. 175- 187, Jan. 2018.
L. Zhao, D. J. Thrimawithana, U. K. madawala, A. P. Hu, and C. C. Mi, “A misalignment-tolerant series-hybrid wireless EV charging system with integrated mangetics,” IEEE Trans. Power Electron., vol. 34, no. 2, pp. 1276-1285, Feb. 2019.
H. Zhao, Y. Wang, H. H. Eldeeb, J. Ge, J. Kang, and O. A. Mohammed, "Determining the optimal range of coupling coefficient to suppress decline in WPTS efficiency due to increased resistance with temperature rise," in IEEE Open Journal of the Industrial Electronics Society, vol. 1, pp. 148-156, 2020.