26 May, 2009

Why laptop ac power adapter can heat

Why laptop ac power adapter can heat
With the ever-changing GHz laptop, LCD screen and push for too much, notebook power adapter power is steadily high, even reaching the level of around 100W, which is about a small desktop power! Hand touch, will be surprised perhaps timid, good, it is a hot potato! What will not fire you? This is a lot of people worry about! Compaq, IBM such large companies have several times on the recovery of the power adapter, it is because there may be deficiencies in power supply design, but will trigger a fire! In fact, as long as the power adapter is in the design of the temperature range that is to say, the temperature in the normal range is generally not dangerous! So, why heat it power? What kind of temperature range it belongs to the normal range? The conversion efficiency switching power supply can only reach about 75% -85%. The answer here. The conversion efficiency switching power supply high enough, and now it is difficult to find a better way of conversion. Switching power supply during the voltage conversion, a lost part of energy loss, which in addition to a small portion of the form of a wave of losses, most of the way heat is distributed out. The greater the power switching power supply, loss of energy the more power the greater the heat. That is why the desktop power supply to add cooling fans for the reason. We may wish to count, a 100W switching power supply, the number of hours in the use of energy loss in the above! Therefore, switching power supply design and production, we must choose the high temperature components. Of course, the power must be in the application of temperature control environment within the scope of the permit. First of all, the conversion efficiency should be designed to be high, as far as possible, and secondly, to choose a small pressure drop, low switching loss components, and the third is to carry out thermal design, heat a large area as far as possible, 100W Switching Power Supply above generally should have metal perforated casing, or together with the cooling fan. Notebook power adapter present in the sixties and seventies W power in general about the use of fire heat sealed plastic package, the internal heat generated primarily through the plastic shell distributed by conduction. Therefore, the power adapter or a very high surface temperature and maximum temperature may even reach 70 degrees Celsius! Think about the internal adapter, it is not like with the fire! Therefore, we in the use of notebook computers, the power adapter as far as possible should be placed in the ventilation heat better place, do not like the books placed in the power of things above. As for the kind of hot feeling, no need to worry about power, not quite so hot!

Laptop AC Adapters: Toshiba PA3467U-1ACA AC Adapter Toshiba adp-65hb AC Adapter HP Pavilion ZV5000 AC Adapter HP 325112-001 AC Adapter DELL INSPIRON 1000 AC Adapter

Comments

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