Why is the power adapter heating up
Release date:2018-01-22 Author:Yang Wei Electronic Click:
The switching efficiency of the switching power supply can only reach to about 75%-85%. The answer is here. The conversion efficiency of the switching power supply is high enough, and it is difficult to find a better conversion mode at present. When switching voltage is switched, there is a part of energy loss. In addition to a small part of the loss in the form of wave, most of them are emitted by heat. The power of the switching power supply is short, the energy of the loss is too short and the heating amount of the power supply is short. This is why the power supply of the desktop is added to the fan to heat the heat. We might as well calculate, a 100W switching power supply, how much energy loss on top of the use!
Therefore, in the design and production of switching power supply, it is necessary to select high temperature components. Of course, it is necessary to control the temperature of the power supply within the allowable range of the application environment.
Power adapter manufacturers professionals believe that, first, the conversion efficiency of designed to be as high as possible, then, to use small pressure drop, low loss switch components, the three is to carry out thermal design, heat dissipation area should be as large as possible, the switching power supply of more than 100W in general should have a perforated metal shell, or plus cooling fan. The current laptop power adapter power is generally around sixty or seventy W, which is made of fireproof and heat-resistant plastic sealed package. The heat generated inside is mainly transmitted through the plastic shell. So, the surface temperature of the power adapter is quite high, even the highest temperature will reach seventy degrees! Think of adapter inside, it is not with fire! So, when we use the notebook computer, try to put the power adapter placed in good ventilation heat scattered places, don't like books something placed in the power. As for the feeling of hot hand, there is no need to worry about it, it's power, no fever.