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Several common problems with power adapters!

source:power adapter     Popular:adapter     release time:2021-09-01 10:34:57     Article author:sznbone    

  Several common problems with power adapters!

  1. What is the meaning of the nominal voltage and current of the power adapter (hereinafter referred to as the power supply)?

  First of all, the nominal voltage of an ordinary power supply 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, so it can be understood that this voltage is the upper limit of the output voltage of the power supply.

  Regarding the use of active voltage stabilizing components inside the power supply, even if the mains voltage fluctuates, its output is a constant value, like ordinary small transformers on the market, such as a power supply such as a walkman, if a commercial electric shaker, The output of the power supply will not fluctuate with it.

Several common problems with power adapters!(图1)

  Generally speaking, the true no-load voltage of an ordinary power adapter is not necessarily completely different from the nominal voltage. Since the characteristics of electronic components cannot be completely different, there is a certain error. The smaller the error, the higher the divergence requirements for electronic components. The cost of consumption is high, so the price is also more expensive.

  Regarding the nominal current value, no matter any power supply has a certain internal resistance, when the power supply is outputting current, it will generate a voltage drop inside, causing two things, one is to generate heat, so the power supply will be hot, the other It causes the output voltage to drop, which is equivalent to internal consumption.

  2. They are all power supplies with the same nominal voltage and different output currents. Can they be used on the same laptop?

  The power supply voltage is the same, the output current is different, can it be used on the same laptop. The fundamental criterion is that a power supply with a large nominal current can replace a power supply with a small nominal current. It is estimated that some people will think this way, and think that a power supply with a large nominal current will burn the books because the current is large. In practice, the current depends on the load when the voltage is the same. Think about the physics of junior high school. When the book is running at a high load, the current is larger, and when the book enters the standby time, the current is smaller, and the power supply with a large nominal current has sufficient current margin. On the contrary, some people use a 56w power supply instead of 72w, and it is no problem. The reason is that the design of the power adapter usually leaves a certain margin, and the load power is less than the power supply. Therefore, this kind of replacement is feasible in ordinary applications, but The remaining power supply power margin is very small. Once your notebook is connected to a lot of peripherals, such as two USB hard drives, then the cpu runs at full speed, and there is a base on which an optical drive reads the disk at full speed. Charging the battery is a risk. You should feel at any time whether your power supply has been able to boil eggs. Therefore, it is best not to replace a large current power supply with a small current power supply.

  Three, the same machine, the power supply of others is warm, mine is always very hot, why?

  Don’t be suspicious about your power supply. First, see what your notebooks are doing. Is it the two USB hard drives mentioned above, the CPU runs at full speed, the hard drive reads and writes rampantly, the optical drive reads the disk at full speed, charges the battery at the same time, and puts it loudly. With music, the screen is brightest, the wireless network card is constantly 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.

  4. The nominal voltage of the power supply is much higher than the voltage of my notebook battery. Nothing will happen, right?

  The first thing to know is that there is a difference between the power supply to the laptop and the battery to power the laptop.

  The output of the battery in battery power supply is pure DC, which is very clean. The voltage of the battery is neither possible nor needs to be designed 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 a 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 maintain the battery.

  The power supply situation of the power supply is more complicated. First, it is necessary to stop further voltage stabilization and filtering to ensure stable operation under the condition of poor power supply performance. Charge the battery all the way, the part that supplies power to the notebook is at the same time and time as the battery, and the part that charges the battery needs to be added to the battery through the battery's charge control circuit. The control circuit can be very complicated, so the power supply voltage must be It is more than the battery cell voltage to have sufficient power to supply each unit of the charging control circuit. Finally, the voltage actually added to the battery cell will never be the nominal voltage of your power supply.


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