Charger principle: We all know that the civilian voltage is 220V, which cannot directly charge the mobile phone. Only when the mobile phone is connected to the charger can it start to work. As long as it is within its power, the charger will provide much current.

We know that the rated voltage for civil use is 220V, which cannot directly charge the mobile phone. The purpose of mobile phone seat charge is to convert 220V high-voltage pulse into 5V low-voltage pulse, and then through a rectifier and voltage stabilizing circuit, it becomes 5V stable DC. In other words, the charging base of the mobile phone plays a role of changing from high-voltage AC to low-voltage DC.

However, directly plugging the mobile phone charging base into the socket will not generate any current. Only when the mobile phone is connected will the charger start to work. The amount of current depends on the state of the load: as long as the load needs more current within the scope of its power, the charger will provide more current.

If the current required by the load exceeds the upper limit of the current that the charger can provide, the charger will always output this current. This is because a protection circuit is usually designed inside the charger. Once the output current is too large, the protection mechanism will be triggered, and the current output will be suspended to avoid danger. That is to say, even if the charger can output 50A of current, if the charging logic control inside your phone is 2A, the charging current will still be limited to 2A, and the charging speed will not be affected basically.

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