Terminal wireless charging receiving device, transmitting device and wireless charging system

Abstract

The invention provides a mobile terminal wireless charging receiving device. The wireless charging receiving device is used for being arranged inside a mobile terminal and is close to a metal rear shell, and is characterized in that the device includes two coils which are connected with each other, the two coils are located in the same plane and connected in series, and the winding directions of the two coils are opposite to each other, so that magnetic flux directions of the two coils generated on the metal rear shell are opposite to each other, the problem of metal rear cover vortex of a mobile terminal containing a wireless charging system such as a smartphone is solved, and an effect that metal body temperature and energy loss are reduced without arrangement of holes or slits in the metal rear cover.

Description

technical field [0001] Embodiments of the present invention relate to the field of wireless charging, and more specifically, relate to a mobile terminal wireless charging receiving device or transmitting device, or a wireless charging system. Background technique [0002] Mobile terminals are widely used as handheld mobile devices. The back shell of the mobile terminal is undoubtedly the part that is in contact with our palms for the longest time. The advantages of the metal back shell are: good texture and feel, and easier to form in one; the metal material takes into account wear resistance High quality and drop resistance, it will only deform when encountering a large force impact, and will not be easily broken like glass. However, for a mobile terminal with a metal back shell that includes a wireless charging system, such as a smart phone, it is necessary to install a wireless charging receiving coil in the smart phone to receive the electromagnetic waves generated by th...

AI Technical Summary

Problems solved by technology

However, the metal back shell will have a certain impact on the signal of the smartphone, and the high-frequency magnetic field cannot penetrate the metal back shell, so special holes or slits are required to destroy the back cover, which reduces and reduces the support strength and aesthetics of the metal back shell In addition, the acceptable aperture of the smart phone’s opening in the back cover is too small for the traditional coil design, and the coupling between the wireless charging transmitting coil and the wireless charging receiving coil installed in the smart phone is insufficient, resulting in low power transmission efficiency

At the same time, for the working frequency of coupled wireless charging (100-200kHz), the metal back shell generates eddy currents under the action of the magnetic field generated by the wireless charging transmitting coil (such as figure 1 As shown), the metal back shell heats up rapidly, causing energy loss and seriously affecting the user experience

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