How Does Qi Wireless Charger Works?

published:2019-05-27
how does electromagnetic works?


Wireless charging technology is derived from wireless energy transmission technology, whicn can be divided into low-power wireless charging and high-power wireless charging.

Low-power wireless charging often uses electromagnetic induction, such as the Qi method of charging the mobile phone, but ZTE's uses induction method. High-power wireless charging often uses resonant (most electric vehicle charging uses this method). The power supply device (charger) transfers energy to the powered device, which uses the received energy to charge the battery and simultaneously supply itself.

Since the magnetic energy is transmitted between the charger and the electric device, the wires are not connected between the two, so that the charger and the electric device can be exposed without conductive contacts.


The mainstream wireless charging technology in the market mainly adopts three methods, namely electromagnetic induction, radio wave, and resonance, while Qi adopts the most mainstream electromagnetic induction technology. It is reported that Qi's application products are mainly mobile phones, which is the first stage, and it will be developed into digital products of different categories or higher power in the future.

How does electromagnetic induction works?

The charging base and the mobile phone terminal respectively have built-in coils. When the two are close to each other, the transmitting coil generates a certain current in the receiving coil through electromagnetic induction based on a certain frequency of alternating current, thereby transferring the point energy from the transmitting end to the receiving end, and then starting supplying power to the phone from The charging base.

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