What are the main operating parameters of the power adapter? How to choose?

With more and more varieties of Power Adapters, now more and more manufacturers, as long as the quality of the product is guaranteed, the working parameters and output joint and the original consistency, then different brands can be completely universal, but also for the working parameters are not strictly the same, can have a certain range of allowable changes. What are the main operating parameters of the Power Adapter? How to choose?

First, the main working parameters of the power adapter:

1, input voltage and input current;

2, output current and output current;

3, output connection head (interface) and output polarity (basically different brands have their own standards);

Generally, notebook adapters are 110-240V input, in line with global international standards.

Two, the purchase of power adapter refer to the following principles:

1, the principle is to choose the same brand of the same type, if not, it can only find other brands;

2, the output voltage of the adapter is best equal to the voltage required by the notebook, if different, then as close as possible to the required voltage of the notebook, controlled within the error of ±5%, this is because the notebook inside the voltage regulator circuit generally has a margin design, in a certain range of input voltage changes, can work normally and stably; Beyond this range, the voltage is too low, the computer may not work steadily or even light up the machine; If the voltage is too high, it may burn out the voltage regulating circuit inside the computer. An Acer laptop, for example, requires a 15V, 3.36A input, but with an IBM16V, a 3.36A adapter will work perfectly with it.

3, the maximum output current of the adapter should be consistent with the maximum current required by the notebook as far as possible, if different, it should be equal to or greater than the required current of the notebook; Note: As long as the current is large, you don't have to worry about how big, no matter how big, don't be afraid, don't worry about burning the machine! But the current should not be too small, because the screen flashing and other unstable conditions may occur. For example, the IBMT30 adapter (16V, 4.5A), although it works safely with the IBMThinkPad 20(16V, 3.36A), it can also work with the ThinkPadX31(16V, 3.5A). The principle is: the power adapter is based on the load to adjust the output current, not static. Like the IBM16V, 4.5A adapter above, it can provide up to 4.5A operating current, but with the T20, it can only output up to 3.36A current. In fact, due to the different working conditions of the laptop, the current it needs is also in constant change, the adapter according to the working conditions of the notebook at any time to adjust the output power, to meet the needs of the computer. The adapter with a higher output current is more flexible, which is a bit of a "kill a chicken with a knife". However, the reverse is not good. Although the T20 adaptor can light up the T30, the T30 screen sometimes flickers because the T20 adaptor cannot provide the consistent operating current required by the T30.

4, the last point should have been in the first place, that is the adapter output interface and output polarity (pay attention to the positive and negative poles) problem, you have to ensure that the purchase of the adapter can be inserted into your laptop, otherwise even if the working parameters are exactly the same, but not plugged in, you have what use. Due to the independence of the major notebook manufacturers, the adapter adapters of different brands are different. The adapters of different series of notebook adapters of the same brand generally have the same specifications, but sometimes different brands may also use the same interface.

For the power adapter main working parameters and selection principles are introduced here, I hope everyone can buy the right products!