Magnetic charger heating should stop charging, so that the temperature drops before charging to avoid damage. Magnetic charger is equivalent to a small transformer, it converts 220V electricity into the voltage that your mobile phone can accept. When the primary winding of the transformer is energized, the magnetic flux generated by the coil flows in the core, because the core itself is also a conductor, the potential will be induced on the plane perpendicular to the magnetic force line, and the potential will form a closed loop on the cross section of the core and generate current. It seems that a vortex is called a vortex.
This \"eddy current\" increases the loss of the transformer and increases the temperature rise of the transformer's core heating transformer.