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AC adapter, the purchase should pay attention to what the problem?

AC Adapter (AC Adapter), AC is the meaning of AC, AC DC power adapter that is. Many electrical appliances have to use AC adapter. Only used in commercial products AC adapter, it is called, in fact, it means a TreadTang power supply, the industry we call switching power supply, only a little difference in appearance.
Power adapter includes two categories of internal AC / DC (AC / DC) power converter, built-in electronics inside, may have multiple output voltage, such as desktop computers internal power supply, etc.; the other is External Single Output AC / DC or AC / AC (AC / AC) power adapter has a single output voltage, usually referred to as an external power supply (EPS), widely used in printers, laptop computers, LCD monitors and gaming applications .
1, be sure to clear your ac adapter input voltage range, the best is the international AC100 - 240V input, so your computer to foreign countries can not use, or returned home from abroad is also connected to AC220V to take smoke.
2, be sure to clear your power adapter output voltage and current!
Is best to complete your power exactly the same nominal voltage and current, as the brand, the difference between different brands of quality is not great, because many brands of power supply may come from the same manufacturer to OEM in the form of stickers card production. Why spend so much money to buy a brand?
While the power supply output voltage and current have a small range, but the over flow point overvoltage protection are set by the manufacturers to accurately test, different computer not the same as its load resistance, once the computer has some of the circuit failure power adapter you can play a protective effect. It has to be chosen non-nominal voltage and current power adapter, because over-voltage protection over-current set point is different, it may serve to protect the notebook laptops role.
3, to clear your power adapter DC output line side aperture size, positive or negative difference between inside and outside, do not buy a home to find that will not fit.
Therefore, the choice of ac adapter, see adapter should pay attention to the quality of products, so you buy the adapter and the mini laptop to connect to give up in order to play its role.