As the functions of smart devices continue to increase, their power consumption begins to become faster and faster. People are getting used to carrying portable chargers or power adapters with them. For many people, the concept of a power adapter only stays at the stage of a charger, but in fact the power adapter is a kind of transformer, which is widely used in chargers. People who are not familiar with power adapters often need to face which power adapter to use for charging.
The parameters of the power adapter are various, so the adapter cannot be used for charging at will. Before choosing a power adapter, first determine three adaptation conditions.
First, the interface of the adapter matches the device;
Second, 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;
Third, the output current of the power adapter should be equal to or greater than the current of the load (mobile device) to provide sufficient power;
Next, let's analyze the above three adaptation conditions.
First, do not plug in mismatched interfaces without professional knowledge, otherwise danger will occur.
Second, as to why the voltage needs to be consistent, the principle is this—the voltage is not enough to drive the load, and the battery cannot be charged normally. In layman's terms, the supply exceeds the demand.
Third, why such a current configuration is needed, it involves the principle of the circuit. Everyone knows that the power supply has internal resistance, and the greater the internal resistance, the greater the loss. Therefore, when the manufacturer produces this adapter, it will determine that the no-load output voltage is within a certain range according to the size of the internal resistance, and the current threshold value corresponding to the voltage threshold value is the nominal current value we see. The larger the adapter, the better the load capacity. Therefore, choosing an adapter with a slightly larger current will not harm the battery, but will make charging faster.
This article roughly introduces how to choose a power adapter according to your own needs, and gives three selection conditions that are relatively easy to understand, and then explains these three conditions separately, which is very suitable for beginners to read. I hope that you can gain something after reading this article, and the editor will also bring you more basic knowledge.