Notes on using the power adapter

Notes on using the power adapter

First of all, the nominal voltage of the general power supply refers to the open-circuit output voltage, that is, the voltage when there is no load and the voltage when there is no current output, so it can also be understood that this voltage is the upper limit of the output voltage of the power supply.

When an active voltage regulator element is used in the power supply, its output is constant even if the supply voltage fluctuates. If the power supply voltage fluctuates, the output of the power supply will not fluctuate with it.

Generally speaking, the actual no-load voltage of ordinary power adapters is not necessarily the same as the nominal voltage, because the characteristics of electronic components cannot be exactly the same, so there is a certain error, the smaller the error, the higher the consistency requirements for electronic components

There are generally several items that need to be paid attention to on the label of the power adapter:

1. It is the model of the adapter. Taking the model XVE-120100 as an example, it tells us several information, that is, its manufacturer, main parameters, etc. The beginning of XVE is generally ## company code, 120100 means that this adapter is 12V1A Yes, 050200 is 5V2A.

Second, it is the INPUT (input) of the adapter, which is generally AC100-240V~50-60Hz in China, which means that the adapter can work normally under the AC voltage of 100V-240V.

Third, it is the OUTPUT (output) of the adapter, DC 12V=1A, which represents the DC power with a rated voltage of 12V, and the maximum current is 1A. Two numbers can quickly calculate the wattage of this adapter. For example, in this adapter, the voltage is 12V*current 1A=12W (power), indicating that this power supply is a 12W adapter.