How to choose the perfect power adapter in three steps

For many people, the concept of the power adapter only stays in the charger stage, but in fact, the power adapter is a kind of transformer, which is widely used in the charger. People who are not familiar with power adapters usually have to face which power adapter to charge.

The parameters of the power adapter vary, so the adapter cannot be charged at will. Before choosing a power adapter, you must 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 burn;

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;

The following is an analysis of the above three adaptation conditions.

First of all, don't plug in a mismatched interface without professional knowledge, otherwise there will be danger.

Second, for the reason that the voltage needs to be consistent, in principle the voltage is not enough to drive the load and the battery does not charge properly. The popular view is that supply exceeds demand.

Third, as to why this current configuration is needed, it involves the principle of the circuit. As we all know, the power supply has internal resistance, the greater the internal resistance, the greater the loss. Therefore, when the adapter is produced, the manufacturer will determine the no-load output voltage within a certain range according to the internal resistance, and the current threshold corresponding to the voltage threshold is the nominal current we see. The higher the nominal value of the current, the better the carrying capacity of the adapter. Therefore, choosing an adapter with a slightly higher amperage won't damage the battery, but will speed up charging.