In general, the principle of wireless charging of mobile phones is the process of converting electrical energy into magnetic fields, transmitting magnetic fields through air, and converting magnetic fields into electrical energy. The principle of wireless charging is similar to that of a transformer. The circuit of the magnetic field coupling of the transformer is a magnetic conductor. The circuit of the wireless charging magnetic field is air, and the magnetic medium is different. The industry's wireless charging technology usually refers to four types: including magnetic induction technology, magnetic resonance technology, microwave technology and electric field coupling technology. The two most important technologies that have come into contact are magnetic induction technology and magnetic resonance technology. The products that are now mass-produced are basically products of magnetic induction technology. The mainstream technologies are magnetic induction technology and magnetic resonance technology. Let's review the basic physics, electric and magnetic fields. Magnetic induction wireless charging technology means that when the transmitting coil passes an alternating electrical signal, the alternating electric field will generate a changing magnetic field through the transmitting coil, and the magnetic coupling effect of the changing magnetic field on the coil around it will be obtained by Faraday's law of electromagnetic induction. The changing magnetic field will generate an electric field. Therefore, the magnetic field generated by the transmitting coil will pass through the receiving end coil, and the receiving coil will generate an electric field, which will generate current if the receiving coil is terminated with a load. Magnetic resonance wireless charging technology is a special case of magnetic induction technology. It is similar to the resonance of our sound. When the oscillation frequency of the system is the same as the natural frequency of the system, resonance occurs. When resonance occurs, the energy intensity of the system reaches the maximum. point. Magnetic resonance wireless charging technology is to generate magnetic resonance when the resonant frequency of the receiving coil is consistent with the resonant frequency of the transmitting coil, and the energy is transmitted from the transmitting end to the receiving end.
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