Power Adapter Intention
Power Adapter Intention
First, the power adapter (hereinafter referred to as the power) of the nominal voltage and current What does this mean? 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 also 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, like the market generally small transformers, such as Walkman with the power supply, if the electricity fluctuations, The output of the power supply will not fluctuate.
Generally speaking, the true 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.
Second, are the same nominal voltage power supply, the output current is different, can not be used in the same books on the
Power supply voltage, the output current is different, can not be used in the same books. The basic principle is that the large nominal current supply can replace the small nominal current supply. It is estimated that some people would like to think that a large nominal current power will burn books, because the current big thing. In fact, how much the current in the same voltage depends on the load, Oh, think of junior high school physics to know.
When the books of high-load operation, the current larger, the books into the standby time, the current is smaller, the nominal current power supply has enough current margin. On the contrary, some people use 56w power supply instead of 72w with no problem, because the power adapter is usually designed to leave a certain margin, the load power should be less than the power supply, so this alternative is generally used in the feasible, But the remaining power supply power margin is very small, once your books took a lot of peripherals, such as two usb hard drive, and then cpu full speed operation, and then a base, above a CD-ROM to read the disk at full speed, plus at the same time Charge the battery, it is estimated that the danger, and at any time to touch your power is not already boiled eggs. So it is best not to use a small current instead of high current power supply.
Three, exactly the same machine, other people's temperature, I always hot, why?
Do not doubt your power supply problems, first look at your books doing, is not like the above said two USB hard drive, CPU full speed operation, hard disk crazy read and write, drive full speed to read the disk, while charging the battery, loudly Music, the screen brightness of the largest wireless card has been in the detection of signals, etc., make good use of power management, according to the task of reasonable adjustment of the work of the books is very important.
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, battery output is pure DC, very clean, the battery voltage is neither possible nor need to design a high, lithium battery chemical properties determine the output voltage of a cell can only be about 3.6V, so A lot of batteries are used in three tandem way, 10.8V also became 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.