In-depth analysis of why the power adapter heats up?

As we all know, during the working process of the power adapter, the conversion efficiency only reaches about 75%-85%. Therefore, when we use the adapter, we often experience heat.
When the power adapter performs voltage conversion, a part of the energy is lost, except for a small part of which is lost in the form of waves, most of which are dissipated in the form of heat. If the power of the switching power supply is insufficient, the energy lost will be insufficient, and the heat generation of the power supply will be insufficient. This is why some large power supplies need to add a fan for cooling.
Therefore, when manufacturers design and produce power adapters, they must choose high temperature resistant components. Of course, the temperature must be controlled within the allowable range of the application environment.
We believe that in order to control the temperature of the power supply, the conversion efficiency should be designed as high as possible. Secondly, switching components with small voltage drop and low loss should be selected. After the meeting, heat dissipation design should be carried out, and the heat dissipation area should be as large as possible. The large, switching power supply above 100W should generally have a metal perforated casing, or add a cooling fan.
At present, the power of many mobile phone power adapters or notebook power adapters is generally about 60W, and PC fireproof materials are generally used, and the heat generated inside is mainly dissipated through the conduction of the plastic shell. Therefore, the surface temperature of the power adapter is still very high. Therefore, it is recommended that when charging the device, try to place the power adapter in a place with good ventilation and heat dissipation to ensure that the power supply can effectively dissipate heat. In addition, it is necessary to choose a power supply with safety certification, so that the charging safety can be guaranteed.