I believe that many users have the same feeling: after prolonged use of laptops, the hottest place than body surface, or even near the outlet, but the notebook power adapter next to pick it up, there is often the feeling of hot, indeed people worry that it will one day suddenly strike, or if there were howling, smoke and other faults.
Notebook adapter is a high-precision, high-efficiency switching power supply, 220V AC electricity is converted to low voltage DC to provide stable power for notebook normal work, it can even be called a notebook. ” the source of power. ”
Inside the dell laptop ac adapter is a switching power supply work in the high-voltage, high-current state, the work load is heavy, and a fully enclosed structure, no cooling holes in the housing, internal fan assisted cooling, and thus power adapter the internal temperature at work are very high. Especially in the hot summer, touching the surface can feel hot, the internal temperature is higher. Thus in the day-to-day office, entertainment, to it the proper care and maintenance.
1 to create a good thermal environment. Using a laptop in a high temperature environment, should be placed in the power adapter and airy place away from direct sunlight; near the cooling air outlet power adapter on the laptop, otherwise not only the power Toshiba PA3715U-1ACA AC adapter The heat does not go out, but also to absorb part of the heat.
In the hot summer, we can put the adapter side, in order to increase the contact area of ??the Dell Alienware M11X R3 AC Adapter with air, so that the adapter’s better dissipate heat. In order to obtain a better cooling effect, we can also pad between the adapter and the desktop into a narrow plastic block or piece of metal in order to increase the air convection speed of the adapter around, to speed up the adapter’s heat.
Exception occurs shall promptly stop using. Power adapter to issue a large noise even smoke, often damaged or malfunction, you should immediately stop using reconditioned by the professional engineer before put into use again.
The use of non-original power to be careful. Non-original power adapter output interface, voltage and current values ??there may be some differences (or nominal and actual discrepancies), if the mismatch, it may affect the stability of the notebook running even more serious consequences . In addition, the different models of the same brand notebook power adapter switching to should be careful, we detail later.
Adapter how heat is generated
Any power has some internal resistance, so when the power supply output current when the internal cause a pressure drop equal to the output current multiplied by the internal resistance of the power. Pressure drop would result in two things, one is to generate heat equal to the output current squared multiplied by the internal resistance, so the power will be hot, and the other is the output voltage becomes equal to the nominal voltage minus the internal pressure drop, causing the output voltage to reduce.
Finished heat problem, the usual design, generally limiting a current value when the output current has reached this value, the output voltage is reduced to 95% of the nominal voltage, or other proportion, the manufacturers can be set according to the different needs of the load products given a higher or lower ratio, the current value is the nominal current.
Such as 72W ThinkPad 16V power Dell Latitude E6420 AC adapter nominal current is 4.5A (16 × 4.5 = 72). If the load resistance is too low, causing the output current exceeds the nominal current, generally two things will happen, one for the individual components due to heat more than the heat capacity resulted in the burning caused by damage to the power, and the other is the thermal design left margin only visible The output voltage is further reduced, if reduced too much may cause the load does not work.
? adapter output current can generic
As we all know, the power adapter is made up of two parts connected together, one side is the power Dell Alienware M17x AC Adapter and the other side is the power cord and plug the laptop jack, when that part of the failure of the power adapter, and sometimes we only change out that part of it, the jack side do not change, which means to borrow other adapter, of course, buy a set of new. So the question now is the same nominal voltage of the power supply, the output current can be used in the same books? The basic principle is: the nominal current of the power supply can replace a small nominal current power.
Some friends have a misunderstanding to think that a large nominal current of the power will burn books, because the current big thing. In fact, the current much depends on the load in the case of the same voltage is the books of the work, when the books when the high-load operation, current, when books go into standby current less, in short, the current is equal to plus in books on the voltage divided by the equivalent resistance of the books. Large nominal current of the power supply has sufficient current margin, not in place of small nominal current power to overheat or output voltage is too low.
Conversely, use the small current power supply instead of the current power on the existence of such danger. But some friends instead of 72W with them no problem, because usually the design of the power adapter to leave a margin, load power must be less than the Power 56W power, so this place in general use is feasible, but the remaining power power margin is very small.
Assuming the books you pick up a lot of peripherals, such as two USB hard disk, and then the CPU is running at full speed, and then there is a base to drive at full speed to read the disk, coupled to charge the battery at the same time, it is estimated that dangerous to be used at any time to hand and felt your power can boil eggs. More 16W 72W than 56W adapter is to deal with this situation. So, it is best not to use a small current power supply instead of the high-current power. When the actual needs if it is to be done, conditionally friends can think of a way to Cece your books maximum consumption, current measurement method is very simple, a socket, a plug, an ammeter, a few wires, a soldering iron can. If the power of the nominal current, of course, is safe.
? battery and adapter supply principle.
Power to the notebook powered with battery supply to the books is different, first of all say the battery-powered, the battery output is pure DC, very clean, and direct access to DC transformer module can be battery voltage is neither possible nor need to design very high the microelectronic circuit voltage of the analog and digital signals demand is now basically at 5V, to get rid of the transformer module efficiency and differential pressure demand, 10.8V sufficient.
Lithium battery chemical electromotive force decided to the saving core output voltage only about 3.6V, so a lot of the battery are three series, 10.8V battery voltage will become very popular. Some battery nominal value than 3.6V integer multiple is slightly larger, such as 3.7V or 11.2V, and so, in fact, in order to protect the battery, or calculate the battery design capacity of tricky behavior.
If you use a power supply, the situation is more complicated, first need to join voltage further regulator filtered, in order to ensure stable power performance is not very good case, the regulated voltage two-pronged, all the way to the books supply of work, another way to charge the battery.
Encounter of that part of the power supply to the books with battery power when the same, while that part of the need to charge the battery only by the charging of the battery control circuit can be added to the batteries, the control circuit can be very complicated, it simply should include primary regulator, precision tunable regulator SCR adjustable pulsating output, regulated output current feedback, chip charging process of recording and computing, the charging process since the feedback regulation parameters, etc., so the power supply voltage must be greater than the voltage of the batteries before sufficient pressure difference margin supply to the charging control circuit of the respective units.
I and classmates adapter, why do I even hotter?
First do not doubt your power, take a look at your books are doing, it is not, as said earlier, two USB hard disk, CPU and graphics card running at full speed, hard disk read and write crazy, drive at full speed to read the disk, while charging the battery, The music loud stood, screen brightness, wireless network card has been the detection signal. Make good use of power management, according to the state of the task reasonable adjustments books work is very important. Many people do not like to use power management, I do not even see many of my friends do not want any kind of management mode is enabled after installing power management software, it is also fitted him to do, does not just want to look at the battery remaining 1% How much it.
? first wife of the adapter is why better than the non-original
The original power prices are usually 200 to 500 yuan, rather than the first wife is much cheaper, so many users in the purchase of a second power supply, will consider choosing a non-original power. In theory, the power of the first wife to be relatively good, but may actually feel the difference. Usually a safe range the load allowed input voltage, such as the nominal value plus or minus 5%, for example, the many 2.5 in. hard disk input requirement is 5V plus or minus 5%. The notebook also, if the input voltage is too large or too small will result in the protection circuit operates, in order to stop work.
However, before the protection circuit operates, the the books internal regulator circuit tend to work the upper or lower limit, in principle, have a certain influence on the life of the device, but in accordance with the present point of view, the reliability of electronic components is already quite good, as long as it is in the design range, rarely a problem, life would not be shorter than the life of books, so this is not the main problem.
The more important question may be books of data security, the automatic protection sudden stop work for the computer is very frightening thing, especially a lot of friends without batteries. Sometimes restart computer somehow related. The manufacturers know that you want to access is for the power supply, the first wife, what kind of load, so you can easily calculate the nominal voltage and nominal current of the power supply.
Nominal voltage of the power supply should meet the following two conditions: First, the maximum current output, nominal voltage minus the voltage drop of the power supply itself, should be greater than 95% of the load voltage required. Second, the minimum current output, design voltage minus the voltage drop of the power supply itself, should be less than 105% of the voltage required by the load.
However, if you use non wife adapter, such as the generic type transformer like the above-mentioned problems can not be seriously considered, then the user can only be as far as possible from the power supply parameters to find ways to get compatible. But the internal resistance of each adapter is different, and the nominal voltage of allowable error may be different, the range of variation of the nominal current output voltage may be different, or even the output ripple factor is not small enough not necessarily.
If not carefully measuring its output power with the output voltage of the relationship, in principle, there is a certain risk, but this risk is small, because if you choose sufficiently large nominal current of the power supply will not appear too large resistance, grain wavelet coefficients may also be through the the books internal regulator to reduce. Although originally attached to the power supply is indeed better than the non-original, but the choice of output current larger non-original power usually no problem.
? Summary:
In this article, we discuss the day-to-day maintenance of the notebook power adapter works and the causes of fever, as well as replacement Note. Seemingly ordinary power adapter, the original has so much knowledge. Already have the books of the user, be sure to take care of it, oh, otherwise once it strikes, the notebook will be lost and the source of power, will soon become a pile of scrap metal.
If you need to temporarily borrow the power of other brands, to try to choose the output current of the same or greater Dell XPS M1730 AC adapter. If the intention to buy a new, original power naturally is the ideal choice, but if you want to save money, then a solid work, larger non-original power output current can be considered.
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