Friends who use laptops will be equipped with a power adapter accessory. The power adapter general parameters include discussion of power supply voltage, power supply, power supply and load matching. The following small series will introduce these common problems. 1. What is the meaning of the nominal voltage and current of the power adapter (hereinafter referred to as the power supply)? The nominal voltage of the power adapter usually refers to the open-circuit output voltage, that is, the voltage value without any load and no current output. Therefore, it can also be considered that this is the upper limit of the output voltage of the power supply. Any power supply has a certain internal resistance. When the power supply outputs current, it will internally generate a voltage drop and generate heat. The ghost win7 is usually designed to limit a current value after considering the heat dissipation problem. When the output current reaches this value, the output voltage is reduced to 95% of the nominal voltage, or other ratios, depending on the needs of the load product. Set a higher or lower ratio, this current value is the nominal current. 2, are the same nominal voltage of the power supply, the output current is different, can not be used on the same notebook? The basic principle is that a large nominal current source can replace a small nominal current source. How much current is at the same voltage depends on the load, that is, the working condition of the notebook. When the notebook is running at a high load, the current is larger, and when the notebook enters standby, the current is smaller. The power supply with large nominal current has sufficient current margin and will not overheat or replace the output voltage after replacing the small nominal current supply. Conversely, when a small nominal current source is used instead of a large nominal current source, there may be cases where the load current is too small and the power supply is overheated or even burned. 3, the same machine, other people's power supply temperature, my always hot, why? Don't doubt that your power supply is wrong. First, let's see what your books are doing. Because the power supply has a certain internal resistance, when the current passes, it will generate a certain amount of heat. If your computer is doing a lot of data reading and writing, calculation, and a lot of external devices, etc., it will increase the power supply current. , causing the power supply to overheat. 4, the power supply nominal voltage is much higher than the voltage of my notebook battery, will not go wrong? The power supply to the notebook and the battery are different from the power supply. The output of the battery is pure DC, which is very clean. It can be directly connected to the DC transformer module. The voltage of the battery is neither possible nor high. Microelectronics The voltage requirements of the analog and digital signals in the circuit are currently basically bounded by 5V, and the efficiency and differential pressure requirement of the transformer module are removed, and 10.8V is sufficient. If the power supply is used, the voltage needs to be stabilized and filtered first to ensure stable operation under the condition that the power supply performance is not good. The voltage after the voltage regulation is divided into two ways, one for the work and the other for the battery. The part of the power supply to the notebook is the same as when the battery is powered, and the part that charges the battery needs to be added to the battery through the battery charging control circuit, and the charging controller circuit will have a large voltage during the adjustment process. Decrease, the voltage that is actually added to the cell will never be very high, please worry about the friend. 5. Why is the original power supply theoretically better than the original power supply? In theory, the original power supply should be relatively better, and in fact, the difference may not be felt. The normal load allows a safe range of input voltage, such as the nominal value plus or minus 5%. One example is that the input requirement of many 2.5-inch hard drives is 5v plus or minus 5%. The same is true for notebooks. If the input voltage is too large or too small, the protection circuit will be activated and the operation will stop. However, before the protection circuit operates, the internal voltage regulator circuit has been biased to the upper or lower working limit, which in principle has a certain impact on the device life. However, according to today's point of view, the reliability of the electronic component is quite good, as long as it is in the design. Within the scope, there will be very few problems, and the life expectancy will not be shorter than the life of the notebook, so this is not the main problem. The more important problem may be the data security of the notebook, and the sudden automatic protection and stop working is a terrible thing for the computer, especially many friends who do not use the battery. Sometimes the computer's inexplicable restart is also related to this. For the original power supply, the manufacturer knows what kind of load to access, so it is easy to calculate the nominal voltage and nominal current of the power supply. That is, the nominal voltage of the power supply should meet the following two conditions. The first is When the maximum current is output, the nominal voltage minus the voltage drop of the power supply should be greater than 95% of the voltage required by the load. The second is the minimum current output. The design voltage minus the voltage drop of the power supply should be less than 105% of the voltage required by the load. However, if you are using a non-original adapter, such as a general-purpose transformer, the above problems cannot be seriously considered. This is because users can only try to get compatibility from the power parameters, but the internal resistance of each adapter is different. The allowable error of the nominal voltage may be different. The definition of the range of the voltage under the nominal current output may also be different. Even if the output ripple factor is not small enough, if the output power is not carefully measured, the output power is the same as the output voltage. The relationship, in principle, there are certain risks, but this risk is very small, the radish home win7 system because as long as you choose a power supply with a large enough nominal current, there will be no problem of excessive internal resistance, the ripple coefficient can also pass the internal The voltage regulation is reduced, so I said that the original power supply is usually better than the non-original power supply. This is the difference between the original power supply and the normal power supply. This article comes from [System Home] www.xp85.com