Characterizing wire wound inductor coils for optimized wireless power transfer

Review of Different Techniques used for Wireless Transmission of Electrical Energy

“…In spite of brook's coil and multilayer coil design, the use of magnetic core for WPT coil design was not effective because of core saturation [20] and negative effect to surrounding wireless devices [22]. With that, [20] and [22] have justified using air core in which is efficient and does not affect inductance with an increase in current.…”

“…Although a higher frequency increases Q-Factor [17,16], the increase in frequency of operation will increase AC resistance due to skin effect and proximity effect that in fact decreases Q-Factor [22,23]. Furthermore, [23] have discovered the increase in AC resistance is most distinct when the stacked layers are increased beyond the maximum amount.…”

“…With that, [20] and [22] have justified using air core in which is efficient and does not affect inductance with an increase in current. Therefore, consideration is required in terms of frequency of operation with number of stack layers and the application of core in coil design is crucial.…”

“…Despite the high efficiency and low internal resistance of multilayer coil, the design requires consideration in terms of skin effect, proximity effect and displacement current [22,23]. Although a higher frequency increases Q-Factor [17,16], the increase in frequency of operation will increase AC resistance due to skin effect and proximity effect that in fact decreases Q-Factor [22,23].…”

“…The multilayer coil proposed by [20], [21] and [22] consists of stacked layers of coils on top of each other where the cross sectional area increases with each stack. Following that, the internal resistance decreases as the stack of coil increases [21].…”