The concept of power adapter only stays in the stage of charger, but in fact, power adapter is a kind of transformer, which is widely used in charger. People unfamiliar with the power adapter often need to face what kind of power adapter to use for charging.
The parameters of the power adapter are various, so you can't use the adapter for charging at will. Before selecting the power adapter, first confirm three adaptation conditions.
1、 The interface of the adapter matches the equipment;
2、 The output voltage must be the same as the additional 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、 The output current of the power adapter shall be equal to or greater than the current of the load (mobile equipment) to provide sufficient power;
The following will analyze the above three adaptation conditions.
1、 Do not insert mismatched interfaces without professional knowledge, otherwise there will be risks.
2、 In principle, the reason why the demand voltage is common is that there is a lack of voltage to drive the load, and the battery cannot be charged normally. The popular point is that the supply is in short supply.
3、 As for why such a current configuration is required, it involves the principle of the circuit. We all know that the power supply has internal resistance. The greater the internal resistance, the greater the loss. Therefore, when producing this adapter, the manufacturer will confirm that the no-load output voltage is within a certain range according to the internal resistance, and the current critical value corresponding to the voltage critical value is the nominal value of the current we see. The larger the nominal value of the current, the better the adapter can carry. Therefore, choosing an adapter with a slightly larger current will not hurt the battery, but will make charging faster.
