تلخیص
Transfer of electrical power from source to load
through wires is a conventional and well-known technology.
However, in recent years wireless power transfer has gained
interest especially in charging applications of portable devices
such as smart phones, PDAs and digital cameras etc. Such devices
are equipped with small batteries which often require frequent
charging. Existing wireless chargers work on the principle of
mutual induction, which requires charging device to be properly
placed on a charging pad for charging purpose. However, these
wireless chargers can transmit power efficiently to a distance of
only up to a few millimeters. Transmission of power to relatively
longer distances (i.e. up to about 1 meter) requires larger diameter
of coils making it impractical for use in portable devices due to
their inherent small size. Magnetic resonance coupling technique
is a potential candidate for such mid-range applications. In this
paper, authors have investigated interdependence of various
parameters affecting the power transfer efficiency of magnetic
resonance coupling. The main aim of the work is to achieve a
practically realizable wireless charging system while optimizing
various factors such as distance, resonator size, conductor size and
resonance frequency. Resonating two coils at same frequency
having significant difference in sizes is a challenge. This is achieved
with external LC impedance matching circuit and is simulated in
this paper. Based on the results, a wireless charger design is
proposed to achieve maximum efficiency using smaller coil size on
the receiver side, making it suitable for portable devices.
Sayed Abdullah Hussain, Yasir Saleem, M Usman Iftikhar, M Saleem Mian, Ahsan Raza, Umer Farooque. (2019) Parametric Study of Magnetic Resonance Coupling for Mid-Range Wireless Charging of Portable Devices, Journal of Space Technology , Volume 9, Issue 1.
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