Laptop power adapter squeak how to do
First of all, to know is that the power supply to the books and the battery power supply to the notebook is different.
Battery-powered, the battery output is pure DC, very clean, the battery voltage is neither possible nor need to design a high, lithium battery chemical properties determine a cell output voltage can only be about 3.6V, so Many batteries are used in three cascade way, 10.8V also became a very popular battery voltage. Some batteries are slightly larger than the integer value of 3.6V, such as 3.7V or 11.2V, etc., in fact, to protect the battery.
Power supply, the situation is more complex, first of all need to add voltage to further regulation filter to ensure that the power performance is not very good in the case of stable work, the voltage regulator after the two parts of the city, all the way to the work of the power supply , The other way to the battery charge to the part of the power supply to the battery when the same power supply, and the part of the battery charge through the battery charge control circuit can be added to the battery, the control circuit can be very complex, so the power The voltage must be greater than the cell voltage to have sufficient capacity to supply the charge control circuit to the units. Finally the voltage actually added to the cell will never be the nominal voltage of your power supply. Rest assured.
Hope that the above information is useful to you
If there is no power supply instability, or the sound of the big situation is generally a normal situation, because the power adapter in the conversion of the power supply is bound to issue a fixed frequency of the sound, different frequency of the inductance coil due to its rated power Is not the same, so the size of the induced current sound is not the same, you can ask if the customer can replace. But if you do not cause other problems theoretically can refuse to replace.
Some problems with the power adapter:
First, the general power of the nominal voltage, is the open circuit output voltage, that is, outside the load is not connected, 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.
