There are three main types: inductance, resonance, and radio waves
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At present, the main application of electromagnetic induction technology and vibration technology two
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Electromagnetic induction: A certain frequency of alternating current in the primary coil generates a certain current in the secondary coil through electromagnetic induction, thereby transferring energy from the transmission end to the receiving end. It is the first generation of mobile phone wireless charging, and the technology is mature, but it can only be single-to-single short-range charging (qi standard, within 1cm, within 5 watts), rather than single-to-multiple charging like WiFi.
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Vibration technology is the second generation, the principle is composed of energy sending device, and energy receiving device, when the two devices adjust to the same frequency, or resonance at a specific frequency, they can exchange each other's energy, is currently being studied a technology
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If the development is successful, it can provide single-to-multiple charging (within 5 meters, within 500, similar to WiFi), which is very promising
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Therefore, the mainstream products on the market are inductive technology, the implementation of Qi standard, generally as long as the Qi standard charging bank\/base (transmitter), can charge the Qi standard mobile phone back shell\/protective shell (receiving end), now Samsung, LG, Nokia, Philips, etc. have similar products sales, the domestic better Shenzhen Xinxi Electronics, Anji technology