How to choose a good power adapter?

As smart devices continue to increase in functionality, their power is starting to drain faster and faster. People are getting used to carrying around portable chargers or power adapters. For many people, the concept of a power adapter is just a charger, but in fact, a power adapter is a transformer, which is widely used in chargers. People unfamiliar with power adapters often need to face which power adapter to use for charging.

The power adapter has a variety of parameters, so you can’t use the adapter to charge. Before selecting a power adapter, you must first determine three adaptations.

(1) The interface of the adapter matches with the device;

(2) The output voltage must be the same as the rated input voltage of the load (mobile equipment), or within the voltage range that the load (mobile equipment) can bear, otherwise, the load (mobile equipment) may be burned;

(3) The output current of the power adapter should be equal to or greater than the current of the load (mobile device) to provide enough power; The following is the analysis of the above three adaptation conditions.

1. Do not insert mismatched interfaces without professional knowledge, otherwise there will be danger.

2, for why the need for voltage consistency, in principle is like this — voltage is not enough to drive the load, the battery can not charge normally, said the popular point is short of supply.

3, for why the need for such a current configuration, which involves the principle of the circuit, we all know that the power supply is internal resistance, the greater the loss of internal resistance. Therefore, when manufacturers produce this adapter, they will determine the no-load output voltage in a certain range according to the size of the internal resistance, and the voltage critical value corresponding to the current critical value is the current nominal value we see, the greater the current nominal value indicates that the adapter carrying capacity is better. So choosing an adapter with a slightly higher current won’t hurt the battery, but will make charging faster.