1. Power adapter(Hereinafter referred to as power supply)What does the nominal voltage and current mean?
Generally, the nominal voltage of the power supply, that is, the rated voltage, refers to the open-circuit output voltage, that is, the voltage when no load is connected to the outside and there is no current output.The nominal current value refers to the rated current of the power supply design, that is, the working current at the maximum load of the power supply design. From the formula of current I=voltage V/resistance R, it can be known that the working current of the power supply changes with the load.
Yes, that is, the working state of the computer determines the working current of the power supply. So don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t ask novice-level questions when buying a power supply: Your power supply has a higher nominal current than mine, will it burn my machine? Those who ask such questions should turn out the junior high school physics book and read it again! No matter any power supply has a certain internal resistance, when the power supply outputs current, it will generate a voltage drop inside, which leads to two things: one is to cause the output voltage to decrease slightly, which is equivalent to internal consumption; the other is to generate heat, so the power supply Will heat up.
2. They are all power supplies with the same nominal voltage and different output currents. Can they be used on the same laptop?
It is best not to use a small current power supply to replace a large current power supply, as this will cause the power supply to work under high load conditions, which will easily generate heat or even burn out. In the case that there is no same current, a large current power supply can be used instead of a small current power supply, but generally it should not be too large, because the larger the current of the power supply, the greater the power loss due to heating. Try to avoid such use. Of course, because of the large horse-drawn cart, the high-current power supply is applied to the low-current machine, and it is not easy to damage. Generally, when manufacturers design computers, there is an error range for voltage and current. The voltage and current of the power supply within the range of plus or minus 10% are compatible.
3. If the machine is exactly the same, the power supply of others is warm, mine is always hot, why?
Don’t doubt that your power supply is wrong, first look at what your notebooks are doing. Is it like too many external devices, CPU running at full speed, hard disk reading and writing crazy, optical drive reading disk at full speed, charging the battery at the same time, playing loud music, The screen is brightest, the wireless network card is always detecting signals, etc. It is very important to make good use of power management and adjust the working status of the notebook according to the task. Energy saving and environmental protection.
4. The nominal voltage of the power supply is much higher than the voltage of my notebook battery. There will be no trouble, right?
First of all, it should be understood that the power supply to the notebook is different from the battery to power the notebook.
Powered by battery, the output of the battery is pure DC, which is very clean. The voltage of the battery is neither possible nor need to be designed very high. The chemical characteristics of the lithium battery determine that the output voltage of a battery cell can only be around 3.6V, so Many batteries use three-stage series connection, and 10.8V has become a very popular battery voltage. The nominal value of some batteries is slightly larger than an integer multiple of 3.6V, such as 3.7V or 11.2V, etc., in fact, to protect the battery.
Power supply, the situation is more complicated. First, the added voltage needs to be further stabilized and filtered to ensure stable operation when the power supply performance is not very good. The stabilized voltage is divided into two parts, all the way to the notebook.Power supply, another way to charge the battery, the part that supplies power to the notebook is the same as when the battery is powered, and the part that charges the battery needs to be added to the battery cell through the battery charging control circuit, the control circuit can be very complexTherefore, the power supply voltage must be greater than the cell voltage to have sufficient capacity to supply each unit of the charging control circuit. Finally, the voltage that is actually added to the battery cell will never be the nominal voltage of your power supply. Don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t worry!