wireless charging technology (English: wireless charging technology; Wirelesschargetechnology) originated from wireless power transmission technology and can be divided into two ways: low-power wireless charging and high-power wireless charging. Low-power wireless charging often adopts electromagnetic induction, such as Qi method for charging mobile phones, but ZTE's wireless charging method for electric vehicles adopts induction method. High-power wireless charging often adopts resonance type (most electric vehicles charge in this way), and the power supply equipment (charger) transmits energy to the power-using device, which uses the received energy to charge the battery and at the same time provides it for its own operation. Because the charger and the electric device transmit energy by magnetic field, there is no wire connection between them, so both the charger and the electric device can be exposed without conductive contacts. Alternating current with a certain frequency in the primary coil generates a certain current in the secondary coil through electromagnetic induction, thus transferring energy from the transmission end to the receiving end. At present, the most common charging pad solution adopts electromagnetic induction. In fact, there is not much mystery in the technical realization of the electromagnetic induction solution. As early as December 25, BYD Company in China applied for the patent of non-contact induction charger, using electromagnetic induction technology.
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