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Wireless power supply technology adopt electromagnetic coupling and other technical methods

electromagnetic coupling
      Electromagnetic coupling is familiar to power engineers. Transformers use this principle to transfer energy. If the two windings of the transformer are separated, it is wireless power supply in a sense. The charging of electric toothbrush is a typical case, but there are great disadvantages in the way of electromagnetic coupling. Without the magnetic core with high permeability as the medium, the magnetic lines of force will seriously diverge into the air, resulting in the decline of transmission efficiency, especially when the two coils are far away. Therefore, it is not suitable for high-power, long-distance wireless power supply.

      Photoelectric coupling
      Convert electric energy into light energy, such as laser, which transmits energy to the destination and then converts it into electric energy. This wireless power supply technology is more intuitive, and photoelectric conversion technology is also relatively widely used. However, the transmission path of light has a defect, that is, there can be no obstacles in the transmission path. Therefore, this technology also has great application defects.
      Electromagnetic resonance
      The term electromagnetic resonance is a little strange. It is said that its principle is similar to the principle of acoustic resonance. Two media with the same resonance frequency can be used to transfer energy. WiTricity's technology adopts this principle. They call it nonradiative electromagnetic resonance. Of course, this may not mean that the technology has no radiation, but it is very different from our common concept of electromagnetic radiation.
      According to the American physicist organization network on July 21 (Beijing time), many existing research groups are trying to use radio waves to provide energy for low-energy micro devices. With the help of this technology, Duke University in the United States has developed a helmet with a sound reminder function.