Wireless charging technology comes from radio energy transmission technology, which can be divided into two ways: low-power wireless charging and high-power wireless charging. Low-power wireless charging often uses electromagnetic induction, such as the Qi method of charging mobile phones, but ZTE's electric vehicle wireless charging method uses induction. High-power wireless charging usually adopts a resonant mode (most electric vehicle charging uses this mode) by the power supply device (charger) to transmit energy to the electric device, which uses the received energy to charge the battery, and at the same time for its own operation. Since the energy is transmitted between the charger and the electrical device by a magnetic field, no wires are connected between the two, so the charger and the electrical device can be exposed without conducting contacts.
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Electromagnetic induction type
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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. At present, the most common charging solution uses electromagnetic induction, in fact, electromagnetic induction solutions in the technical realization is not too mysterious, China's local BYD company, as early as December 2005 to apply for a non-contact induction charger patent, the use of electromagnetic induction technology.
Magnetic resonance
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Consisting of an energy transmitting device and an energy receiving device, when the two devices are tuned to the same frequency, or resonant at a particular frequency, they can exchange energy with each other, is a technique that is currently being studied, The research team, led by MIT physics professor Marin Soljacic, used the technology to light a 60-watt bulb two meters away and named it WiTricity. The diameter of the coil used in the experiment reached 50cm, which is not yet commercialized, and if the size of the coil is reduced, the receiving power will naturally decrease.
Radio wave type
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This is a more mature technology, similar to the early use of ore radios, mainly composed of microwave transmitters and microwave receivers, can capture the radio wave energy bouncing off the wall, while adjusting with the load while maintaining a stable DC voltage. This method requires only a transmitter mounted in a wall plug and a \"mosquito\" receiver that can be installed in any low-voltage product.