Reading of nominal voltage and current of power adapter (hereinafter referred to as power supply)

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 external load and no current output, so it can also be understood that this voltage is the upper limit of the power supply output voltage.

When active voltage stabilizing elements are used in the power supply, even if the mains voltage fluctuates, the output is constant. If the mains voltage fluctuates, the output of the power supply will also fluctuate, such as the small transformer in the market, such as the walkman.

Generally speaking, the true no-load voltage of an ordinary power adapter may not be completely consistent with the nominal voltage, because the characteristics of electronic components may not be completely consistent, so there is a certain error. The smaller the error, the higher the consistency requirements of electronic components, the higher the production cost, so the price is more expensive.

In addition, with regard to the nominal current value, no matter what power supply has a certain internal resistance, when the power supply outputs current, there will be internal voltage drop, resulting in two things: one is to generate heat, so the power supply will be hot, and the other is to reduce the output voltage, which is equivalent to internal consumption.

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