Laptop power adapter common sense

There are some common sense about  Sony Ac Adapter, Toshiba Ac Adapter,Panasonic Ac Adapter,ResMed Ac Adapter,Samsung Ac Adapter, Microsoft Ac Adapter,Msi Ac Adapter ......   that we need to know.

• what does the AC adapter nominal voltage and current mean?

General power nominal voltage, refers to the open-circuit output voltage is outside without any load, no current output voltage, so it can be understood, this voltage is the power supply output voltage limit.
For the internal use of the active voltage regulator components, even if the mains voltage fluctuations, the output is constant, as the market generally small transformers, such as walkman and the like with the power supply, if the mains fluctuations, The power output will fluctuate.

Generally speaking, the actual no-load voltage of ordinary power adapter is not exactly the same as the nominal voltage, because the characteristics of electronic components can not be exactly the same, so there is a certain error, the smaller the error, the higher the consistency of the electronic components , The cost of production is high, so the price is more expensive.

In addition, the nominal current value, regardless of any power supply has a certain internal resistance, so when the power output current, there will be internally generated pressure drop, resulting in two things:
1. generate heat, so the AC adapter will be hot
2. lead to lower output voltage, internal consumption.

• Same laptop, someone else's AC adapter is warm, my is always hot.     Why?

First do not doubt your AC adapter have problems. First, look at what your laptop is doing, whether two USB hard drives, CPU full speed operation, hard drive read and write, drive full speed read the disk, while charging the battery, loudly on the music, Screen brightness maximum, the wireless card has been detecting signals and so on, make good use of power management, according to the task to properly adjust the working status of the laptop is very important.

• Why is the original power AC adapter is usually better than non-original AC adapter?

This issue should be a lot of people care about. In theory. The original AC adapter is definitely better, but the actual use may not feel the difference. Usually our equipment has a safe voltage input range, such as a 2.5 mobile hard disk, it is required 5V plus or minus 5%, too high or too low, the protection circuit will stop the work of the device. If the protection circuit is activated, this means that your machine has approached or exceeded the upper or lower limit of its design, which has an impact on the life of the machine. (Of course, the non-original AC adapter mentioned here is a good workmanship, if it is a poor quality product, do not mention it.)

More important issue may be laptop data security, sudden automatic protection and stop working for the computer is a terrible thing, especially for many friends without batteries. Sometimes the inexplicable restart of the computer is also related to this.
For the original AC adapter, manufacturers are very aware of how much power their own power needs, they calculate the safety of the nominal voltage and current is certainly more accurate.

However, if you are using non-OEM adapter, such as a general-purpose transformer, the above problems can not be seriously considered. Users should try their best to obtain compatibility from the power parameters, but the internal resistance of each adapter is different. The nominal voltage The allowable error may be different. The range of the voltage under the nominal current output may also be different. If you do not carefully measure the related values, it is certain that there is a risk.

This is the difference between original and non-original, if it is poor quality non-original AC adapter, That certainly is even more not insurance.