Disassemble the shell of the input end, the shell is packaged by ultrasonic welding process, and the pins and PCB board are connected to power through AC wires.

The interior of the charger is composed of three small boards, and power chips are welded between the input and output small boards. This design can maximize the use of internal space and reduce the size of the charger.

The small plate at the output end corresponds to the hollow design of the transformer, and the transformer is placed and fixed with glue to make full use of the internal space and further reduce the volume.

After observing and analyzing the three PCB boards, it is found that the Anker Nano 20W PD charger adopts a typical switching power supply with a wide range of output, and the design architecture of the output voltage is controlled by the secondary protocol chip. Let's start from the input end to understand each component one by one.