I am a Lenovo G550 notebook, the original adapter output voltage is 19V 4.74A. Now I got an original adapter, which is on another machine, the voltage is 20V 4.5A. Do not know this user will not have any harm to the computer, I see the Internet has a different power will burn the machine and the like, so ask everyone. Thank you!
The problem is not great, but be sure to pay attention to positive and negative
The problem is great, to repair to the Huai'an City, Jiangsu Province, Qingpu District, Water Gate Bridge, 3rd Floor, Fortune Plaza,
Lenovo power adapter voltage and current problems:
First of all, the general power of the nominal voltage, refers to the open circuit output voltage, that is, do not take any load outside, there is no current output voltage, it can be understood that this voltage is the upper limit of the power output voltage.
For the internal use of the active power regulator components, even if the mains voltage fluctuations, the output is also a constant value, as the market generally small transformers, such as portable with the type of power supply, if the electricity fluctuations, The output of the power supply will fluctuate.
Generally speaking, the actual no-load voltage of the ordinary power adapter is not necessarily the same as the nominal voltage, because the characteristics of electronic components can not be completely consistent, so there is a certain error, the smaller the error, the higher the consistency of 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, the internal pressure drop will occur, resulting in two things, one is to generate heat, so the power will be hot, and the other One is to cause the output voltage to decrease, which is equivalent to the internal consumption.
