As the frequent change of laptop, and LCDs rapid development inch by inch, the power adapter of laptop is making progress stage by stage, even reaching the 100W or so, almost equals a small desktop computer power supply! Like this
HP 402018-001 AC adapter, its a common one that the watt is 65W.While putting your hand on it, you may be worried that will it not fire? Compaq, IBM, such big companies have brought back their power adapter due to it may have the power design flaws, and lead to fire!
In fact, as long as the temperature of power adapter is not higher than the designed temperature, that is, the temperature belongs to the normal range; the power adapter generally is safe! As this
HP 402018-001 AC adapter, it has the same problem. So, why are the power heated? What temperature range is in the normal scope? Switching power conversion efficiency can only reach about 75% -85% at present. The answer is here. Switching power conversion efficiency is high enough, and it is still difficult to find a better conversion. Switching power supply during voltage conversion, some energy lost, which in addition to a small part of the loss is in the form of waves, the majority are distributed by way of heat. Higher of power switching power supply, more loss of energy also more amount of heat being distributed. That is why desktop power supply to add a fan for cooling reasons. This is the reason why a fan is put on the desktop power supply to cool.
Therefore, while designing and producing switching power supply, be sure to select the components that can withstand high temperature. Of course, the temperature must be controlled in the range that application environment permits. First, the conversion efficiency should be designed to be as high as possible, and secondly, components and parts of low pressure and low loss should be adopted. The third is design good heat output system. Heat exchanging area should be as large as possible. For example, generally switching power supply of more than 100W should have metal perforated casing, or be with cooling fan.
As I have learned the information above about the heat of the
HP 402018-001 AC adapter, I have no worry about the heat of laptop adapter and also take some measures to cool it.
