In general, wireless charging will heat up
1. Scheme selection. This is the most fundamental reason, different solutions have their own characteristics, such as NXP, IDT, easy charge, Xxin-sun and other wireless charging solutions, whether in charging efficiency, mobile phone compatibility, or in the disconnected charge, temperature control and other aspects are different.
Some manufacturers in consideration of the cost, they will use some relatively cheap programs, abandon some peripheral circuits and some functions, a penny a penny, which is why some products sell hundreds of dollars, but some only a few dollars.
2, temperature control circuit. The general wireless charging scheme will have a temperature control circuit and NTC thermistor, this function is mainly to prevent the circuit in the process of working to generate too much heat, burn components, etc., can also control the power components after generating too much heat, reduce the power, thereby reducing the temperature.
1 It may get hot.
2 This is because the use of wireless chargers needs to put the device on the charging board, through the electromagnetic induction to achieve charging, this process will occur a certain degree of energy conversion, will produce a certain amount of heat, resulting in the charger temperature rise.
3 However, Apple's official wireless charger uses an efficient heat dissipation design, which can maintain a suitable temperature under normal use and will not affect use.