As smart devices continue to increase in functionality, their power consumption is starting to get 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 charger stage, but in reality the power adapter is a transformer that is used in a large number of chargers. People who are unfamiliar with power adapters often have to face what kind of power adapter is used for charging.
The power adapter has a variety of parameters, so the adapter cannot be used to charge. Before selecting a power adapter, first determine the 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 the voltage range that the load (mobile device) can withstand, otherwise the load may be burned (mobile device);
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;
Analysis of three adaptation conditions
First, the mismatched interface should not be inserted without professional knowledge, otherwise it will be dangerous.
Second, why the voltage is consistent, in principle, this is the case - the voltage is insufficient, not enough to drive the load, the battery can not be charged properly, the popular point is that the supply is in short supply
Third, for the reason why such a current configuration is required, this involves the principle of the circuit. Everyone knows that the power supply has an internal resistance, and the larger the internal resistance, the greater the loss. Therefore, when the manufacturer produces this 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 see. The current value is higher. The greater the adapter load capacity, the better. So choosing an adapter with a slightly larger current will not only damage the battery, but will make charging faster.