A novel method for reduction of coil weight and size in wireless power transfer

Higher switching frequency in wireless power transfer (WPT) applications leads to higher efficiency and makes it possible to transfer the same power in higher distances or in smaller footprints. The footprint and switching devices operational frequency limitation, make the efficient power transmission impractical in small available footprint of coils or high power transmission. In this paper a novel approach is proposed, which is based on filtering an odd harmonic of fundamental switching frequency instead of fundamental switching frequency. This results in higher transfer frequency at the same switching frequency. Additionally, the paper investigates appropriate converter for this approach. The selective harmonic approach decreases the required mutual inductance dramatically. This advantage leads to far smaller and lighter coils in the same coupling distances and the same application. The accuracy and effectiveness of this approach and the designed converter is verified by simulation.

[1]  Bin Gu,et al.  High-Efficiency Contactless Power Transfer System for Electric Vehicle Battery Charging Application , 2015, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[2]  Chunting Chris Mi,et al.  Wireless Power Transfer for Electric Vehicle Applications , 2015, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[3]  Grant Covic,et al.  Power transfer capability and bifurcation phenomena of loosely coupled inductive power transfer systems , 2004, IEEE Transactions on Industrial Electronics.

[4]  Alireza Namadmalan,et al.  Self-Oscillating Tuning Loops for Series Resonant Inductive Power Transfer Systems , 2016, IEEE Transactions on Power Electronics.

[5]  Chih-Jung Chen,et al.  A Study of Loosely Coupled Coils for Wireless Power Transfer , 2010, IEEE Transactions on Circuits and Systems II: Express Briefs.

[6]  Farzad Tahami,et al.  Minimum weight wireless power transfer coil design , 2016, 2016 7th Power Electronics and Drive Systems Technologies Conference (PEDSTC).

[7]  R. Mecke,et al.  High frequency resonant inverter for contactless energy transmission over large air gap , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[8]  C Aw Contactless Power Transfer System for Electric Vehicle Battery Charger , 2011 .

[9]  J. T. Boys,et al.  Design and Optimization of Circular Magnetic Structures for Lumped Inductive Power Transfer Systems , 2011, IEEE Transactions on Power Electronics.

[10]  Hua Cai,et al.  Harmonic-Based Phase-Shifted Control of Inductively Coupled Power Transfer , 2014, IEEE Transactions on Power Electronics.

[11]  Grant Covic,et al.  Design considerations for a contactless electric vehicle battery charger , 2005, IEEE Transactions on Industrial Electronics.