A little heat while charging is normal
About charging heat:
The charger is equivalent to a small transformer, which converts 220V electricity into the voltage acceptable to your mobile phone. 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.
Magnetic charging treasure, internal device damage, failure, voltage instability, reduced efficiency, resulting in serious heat loss, charging head feel hot, this situation needs to change a charging head.
2, the mobile power supply itself charging current is large, the charging head can not afford to take, in the limit working state, heat, this situation needs to change the charging head with large output current.