Battery charging process using AC adapter

The process of charging the battery using the AC adapter is as follows

Connecting device

Plug the AC adapter into the power outlet, making sure the connection is secure and stable. At this point, the AC adapter starts to obtain AC power from the grid.

Connect the output of the AC adapter to the device that needs to be charged, usually through a specific charging interface or data cable.

Ac adapter operation

Input AC conversion

The circuit inside the AC adapter first rectifies the input AC power, converting it to direct current. This process is usually achieved using a diode rectifier bridge, which converts AC sine waves into unidirectional pulsating direct current.

Voltage regulation

Then, the rectified DC is depressurized and regulated through transformers and other electronic components to make its output suitable for battery charging voltage. The charging voltage required for different battery types and devices is different, and the AC adapter needs to be adjusted according to the specific situation.

Current control

At the same time, the AC adapter will also control the output current to ensure a safe and stable charging process. At the beginning of charging, when the battery is low, it may be quickly charged with a larger current; As the battery power increases, the charging current will gradually decrease to avoid overcharging and damaging the battery.

Battery charging

Constant current charging phase

When the connection is established, the battery begins to charge, first entering the constant current charging phase. At this stage, the charging current remains relatively stable and the voltage of the battery gradually rises.

Constant voltage charging phase

When the battery voltage reaches a certain value (usually close to the rated full voltage of the battery), the charging enters the constant voltage charging stage. At this stage, the charging voltage remains constant, while the charging current gradually decreases.

Charge complete

When the charging current is reduced to a preset threshold (for example, tens of milliamps), the AC adapter determines that the battery is full and stops charging or enters trickle charging mode to maintain the battery's charge.