Things to be aware of when using a power adapter
Source：http://brickdefender.comPublished time：2017-01-10 09:08:00Views：
First, the power adapter (hereinafter referred to as power supply), the nominal voltage and current mean? First of all, the general power supply nominal voltage, is the open-circuit output voltage, which is not connected to any outside load, no current output voltage, it can be understood that this voltage is the upper limit of the power supply output voltage.
For the internal use of the power regulator active components of the case, even if the mains voltage fluctuations, the output is constant, like the market in general small transformers, such as Walkman with the power supply, if the electricity fluctuations, The output of the power supply will not follow the fluctuations.
In general, the real power adapter is not necessarily true and no-load voltage and nominal voltage is exactly the same, 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 production cost is high, so the price will be more expensive.
In addition, the nominal current value, regardless of any power supply has a certain resistance, so when the power output current, will produce a voltage drop inside, resulting in two things, one is to generate heat, so the power will be hot, the other One is to cause the output voltage to drop, which is equivalent to internal consumption.
Second, are the same nominal voltage power supply, the output current is different, can not be used in the same books?
Power supply voltage, the output current is different, can not be used in the same books. The basic principle is that a large nominal current supply can replace a small nominal current source. It is estimated that some people would think that the power supply will burn a large nominal current books, because the current big thing. Real case depends on the load, huh, huh, think of junior high school physics to know. When the books when the high-load operation, the current is bigger, the books into the standby time, the current is smaller, large nominal current power supply has sufficient current margin. On the contrary, some people use 56w power supply instead of 72w with no problem, because the design of the power adapter is usually left a certain margin, the load power should be less than the power supply, so this replacement is feasible in general use, But the remaining power power margin on the very few, once your notebook then a lot of peripherals, such as two usb hard drive, and then run cpu at full speed, and then a base, above a full speed drive to read the disk, plus at the same time To charge the battery, it is estimated to be dangerous, and feel free to touch your power is not already can be boiled eggs. So it is best not to use a small current power supply instead of high current power supply.
Third, exactly the same machine, the temperature of the power of others, and I always hot, why?
Do not doubt your power first, look at your books in doing, is not like the above that the two USB hard drive, CPU running at full speed, hard drive crazy read and write, drive at full speed to read the disk, while the battery charge, loud With music, screen brightness, wireless network card has been in the detection signal, etc., make good use of power management, according to the task of reasonable adjustment of the working state of the books is very important.
Fourth, the power supply voltage higher than my laptop battery voltage is much higher, will not crash, right?
First of all, you know, the power supply to the books and battery power to the books are different.
Battery-powered, battery output is pure DC, clean very, the battery voltage is neither possible nor need to design very high, the chemical characteristics of lithium batteries determine a section of the core output voltage is only about 3.6V, so A lot of batteries are in series with the way three, 10.8V also became very popular battery voltage. Some of the battery's nominal value is slightly larger than the integer multiple of 3.6V, such as 3.7V or 11.2V, etc., in fact, in order to protect the battery.
Power supply, the situation is more complicated, first of all need to join the voltage regulator for further filtering to ensure that the power supply performance is not very good in the case of stable operation, the voltage regulator is divided into two parts, all the way to the books work, Another way to charge the battery to the books that part of the same power supply with the same battery, and to charge the battery that part of the need to charge the battery control circuit can be added to the battery, the control circuit can be very complex, so the supply voltage Must be greater than the core voltage to have sufficient capacity to supply the charge control circuit of the unit. Finally, the voltage actually applied to the cell will never be the nominal voltage of your power supply. Rest assured.
An appropriate power adapter is required to have the safety certification, the safety certification of the power adapter can protect the personal safety. To prevent electric shock, fire and other hazards
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