Method of Selecting Power Adapter Correctly

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  • Jimmy at
  • August 19, 2019

Method of selecting power adapter correctly



Power adapters are widely used in our daily life, such as mobile phones, LED lights, routers, notebook computers and printers, etc. But many people are confused when choosing the power adapter. Let's share three requirements for choosing the power adapter.


1.The interface of power adapter should match the device.


2. The output voltage must be the same as the rated input voltage of the load (mobile device), or within the voltage range that the load (mobile device) can withstand. Otherwise, the load (mobile device) may be burned.


3. For the reason why such a current configuration is needed, it involves the principle of the circuit. Everyone knows that the power supply has internal resistance, the greater the internal resistance, the greater the loss. Therefore, when the manufacturer produces the adapter, it will determine the no-load output voltage within a certain range according to the internal resistance. The current threshold corresponding to the voltage threshold is the current nominal value we can see. The larger the current nominal value, the better the power adapter carrying capacity. So instead of hurting your battery, choosing an power adapter with a slightly higher current will make your charging faster.


Pay attention to three principles, but this is not absolute. Circuits are full of our daily life. It is helpful to understand basic circuit knowledge.

Correct selection of power adapter, correct use, will not cause damage to electronic equipment, will not shorten the normal service life.