source:power adapter Popular:adapter release time:2021-07-05 10:06:04 Article author:sznbone
The power adapter plays an indispensable role in our lives. It may not be easy to be found on the bright side, but it is inseparable from household appliances. Today I will introduce you to the power adapter. A few common questions! Let's take a look!
1. What does the nominal voltage and current of the power adapter (hereinafter referred to as the power supply) mean? First, the nominal voltage of the general power supply is the voltage output by the guide circuit, which means that no load is connected to the outside and there is no current output. Therefore, it can also be understood that this voltage is the limit of the output voltage of the power supply.
Under the condition that the components of the active regulator tube are used in the power supply, even if the voltage and voltage fluctuate to a certain extent, the output is stable, like the general small transformers on the market, such as mp3 players. , If the voltage fluctuates, the output of the power supply is not easy to fluctuate.
Generally speaking, the true full-load voltage of a general power adapter may not be exactly the same as the nominal voltage. Since the characteristics of electronic components are unlikely to be completely consistent, there is a certain deviation. The smaller the deviation, the consistency of the electronic components is stipulated. The higher the cost, the higher the manufacturing cost, so the price is more expensive.
In addition, regarding the nominal current value, regardless of the power supply, there is always a certain internal resistance. Therefore, when the power supply outputs current, it will cause internal pressure drop, causing two things. One is causing heat, so the power supply will Heat, the other is to reduce the output voltage, which is equal to internal consumption.
2. All power supplies with the same nominal voltage and different output currents can be used on the same notebook?
The power supply voltage is the same, the output current is different, can it be used on the same notebook. The basic standard is that a power supply with a large nominal current can replace a power supply with a small nominal current. It is estimated that many people will think that, and feel that a power supply with a large nominal current will burn the notebook, because the current becomes larger. In fact, how much current depends on the load when the voltage is the same, ha ha ha, just think about physics in junior high schools. When the notebook is under load for a long time, the current is higher, and when the notebook is turned off, the current is lower. The power supply with large nominal current has sufficient current capacity. On the contrary, many people use a 56w power supply instead of 72w without any problems. The reason is that the design of the general power adapter leaves a certain capacity, and the load output power must be lower than the power supply output power. Therefore, this type of replacement is used in general applications. It works, but the remaining output power capacity of the power supply is very small. Once your notebook is connected to many external devices, such as two USB solid state disks, then the cpu runs at high speed, and there is a base. The CD-ROM drive reads the disk at high speed, plus the additional charge of the battery, it is estimated to be a risk. You have to feel your power supply anytime and anywhere to see if you can already cook eggs. So try not to replace the high-current power supply with a small-current power supply.
Three. Identical equipment, other people’s power supply is warm, mine is always hot, why?
Don’t suspect that your power supply is not good. Let’s take a look at what your notebook is doing. Whether it’s like the two USB solid-state disks mentioned above, the CPU is running fast, the solid-state disk has crazy read and write capabilities, the optical drive reads the disk fast, and the battery is added. Charging, playing songs in a loud voice, bright display, wireless network card has been detecting data signals, flexible use of power management methods, and effective adjustment of the notebook's work attitude based on daily tasks is very important.
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