Wireless power transfer through metal using inductive link

Abstract

<span style="color: #000000; font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 10px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">This paper presents a highly efficient power transfer system based on a co-design of a class-E power amplifier (PA) and a pair of inductively coupled Helical coils for through-metal-wall power transfer. Power is transferred wirelessly through a 3.1-mm thick aluminum barrier without any physical penetration and contact. Measurement results show that the class-E PA achieves a peak power gain of 25.2 dB and a maximum collector efficiency of 57.3%, all at 200 Hz. The proposed system obtains a maximum power transfer efficiency of 9% and it can deliver 5 W power to the receiver side through the aluminum barrier.</span>

A Comparative Review on Acoustic and Inductive Power Transfer

“…Inductive power transfer (IPT) technology, using a relatively large air gap, can transport power from a high-frequency power source to loads via magnetic coupling without direct engagement [24][25][26][27]. This efficient approach was created swiftly and has previously been employed in a variety of current applications such as wireless charging, underwater power supplies, and electric automobiles 190 [28][29][30].…”

A Design Technique for Optimizing Resonant Coils and the Energy Transfer of Inductive Links

“…their uniform magnetic field [14], can provide a large inductive coupling in comparison with spiral coils [6], [9], [14]- [17]. Examples of such systems include high-voltage battery charging [11], [18], [19] and WPT through-metal-walls [20]- [22]. It should be noted that selecting the coil topology is mainly influenced by the application's spatial restriction.…”

Miniature Coil for Wireless Power and Data Transfer through Aluminum

“…In [4], a solenoid coil of 234 mm × 63 mm × 61 mm was used with an even larger core to transfer 1.2 W at 10% efficiency through stainless steel (10-mm). In [10][11][12], a helical stacked coil of 49 mm outer diameter and 50 mm height demonstrated power transfer of 5 W at 9% efficiency through aluminum (3.1 mm). Only [9] has partially demonstrated power and data transfer through metal using the same coil structure, but information on the coil size and data rate were not available.…”

“…Only [9] has partially demonstrated power and data transfer through metal using the same coil structure, but information on the coil size and data rate were not available. In general, the size of a coil used for wireless power transfer through metal ranges between 30 mm to 400 mm [4,[9][10][11][12][13]. The large coil size poses a limitation for certain applications [14].…”