Abstract
The advancement of portable and implantable electronic devices has driven active research into wireless power transfer (WPT) methods. Current commercial WPT techniques using coil coupling have limitations, such as range, frequency, safety, line of sight, orientation, and concurrency. This paper presents a system utilizing oscillating magnets to extract power from a low-level ac magnetic field. This system enables the simultaneous powering of multiple low-power devices in an environment that meets human safety requirements. Compared with conventional WPT techniques, such as RF or acoustic power transfer, the proposed system transfers stable power to electronic nodes placed anywhere within the magnetic field under low driving frequency. Theoretical power calculations and experimental demonstrations are presented to prove the concepts and quantify performance. A custom three-dimensional printed millimeter-size oscillator loaded with two 8 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> cubic permanent magnets is employed as the energy receiver to experimentally validate the proposed system. Measurements show that the raw ac electrical power and rectified dc power received by the oscillator achieve 269 and 135 μW, respectively, under 400 μT excitation magnetic field amplitude at 355 Hz.
Highlights
W HILE the Internet of Things (IoT) continues to expand in both number and variety of deployed devices, keeping them powered unobtrusively is largely an unmet need
In order to generate an ac magnetic field, a Helmholtz coil is driven by a sine wave from a function generator amplified by a power amplifier
This paper proposed a new wireless power transfer (WPT) system that utilizes resonating magnets to receive power from an ac magnetic field source, which can be a Helmholtz Coil
Summary
W HILE the Internet of Things (IoT) continues to expand in both number and variety of deployed devices, keeping them powered unobtrusively is largely an unmet need. Even as the cost of sensors, cameras, transmitters, and other useful widgets decreases, the cost of installing them, most notably with a reliable power supply, decreases little if at all These devices are hardwired, use batteries, harvest energy from the environment or use some type of wireless power transfer (WPT). Especially ultrasound, are well suited for delivering power through compatible materials, such as water and human tissue. Commercial success of these methods proves the need and desire for wireless charging with opportunities for techniques that can expand the use conditions [33].
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