The principle of wireless charging of car mobile phone bracket is the use of electromagnetic induction principle, when the main device (such as mobile phone) is placed in the car bracket and paired with the charger, the electromagnetic coil inside the charger will generate a magnetic field, and then induce the coil inside the device to generate a relative electric field, so that energy can be transmitted to the device through electromagnetic induction wireless. And restore the power in the device's built-in battery.
This technology is also known as electromagnetic coupling or wireless power transmission, which eliminates the cable of the traditional charger, makes charging more convenient, and also increases the charging security of the device, but the charging efficiency is relatively slower than that of wired charging.