Adjustable wireless power transfer system using port-selective switching coils

Abstract

A port‐selective switching (PSS) coil that has multiple terminations on a typical spiral is proposed for an adjustable wireless power transfer system. The impedance of the coil can be changed by selecting a different input/output port location, which enables the coil system to be adjustable. A PSS coil that has five switches is fabricated. The transfer range at which efficiency exceeds 50% increases by 2.5 times for the single‐sided PSS system and by 5.5 times for the double‐sided PSS system compared with the conventional system. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1420–1423, 2016

Comparative analysis of hybrid and traditional resonators for magnetically coupled wireless power transfer

“…Ever since strongly coupled magnetic resonance was reported, a great deal of attention has been paid to MC-WPT. 5,6 Compared with the MI-WPT, MC-WPT is proved to be a more efficient solution for contactless power transmission with much longer transfer distance even when the flux linkage between the transmitter and the receiver is relatively weak. Unfortunately, there exists frequency splitting when the distance between receiving coil and transmitting coil decreases below a certain value, leading to dramatic degradation in transfer efficiency.…”

“…1 Recently a lot of work has been conducted by researchers using ring resonators to design bandpass filters for use in next generation high-data rate communication systems that require more than 20% fractional bandwidth (FBW), and good passband and out-of-band performance. [1][2][3][4][5][6][7][8] In Ref. [2], two open-circuited stubs are connected to a ring resonator to generate a wide passband depending on the lower and upper attenuation poles, whereas in Ref.…”