Disassembly report: zyxei 20W Mini PD fast charger sl-148cn - Zhihu

Zyxei brand of Shenzhen Xinqi Digital Technology Co., Ltd. has launched a 20W PD fast charging charger, which supports QC and PD fast charging protocols and can meet the daily fast charging needs of iPhone 12. The biggest feature of the product is that it can be combined with foldable pins and has ultra small size. Next, the charging head network will disassemble this charger, let's take a look at its internal design.

1、 Appearance of zyxei 20W charger

Zyxei Mini 20W charger adopts cube shape design. The body is small and simple, the surface of the shell is matte, the corners are curved, and the user feels good. In addition, one side of the charger is printed with zyxei brand logo.

20W is printed on the other side.

The charger input is equipped with foldable GB pin.

And the charger parameter information is marked on the shell

Model: sl-148cn

Input: 100-240V ~ 50 / 60Hz 0.5A

Output: 5v3a, 9v2.22a, 12v1.67a

Manufacturer: Shenzhen Ouli Technology Co., Ltd

Producer: Shenzhen Xinqi Digital Technology Co., Ltd

The product has passed 3C certification.

Usb-c port and LED indicator are set on the top of the fuselage.

The interface is equipped with metal decorative ring to make the product look more delicate.

The measured length of charger body is 33.06mm by vernier caliper. The width is 31.75mm.

The thickness is 31.75mm. Compared with apple 20W charger, the volume advantage is obvious. The intuitive feeling of holding it in the hand is small and light. The net weight of the charger is about 41g. When the power is on, the LED lights up in lavender.

iPhone Adapter


The output protocol of usb-c port is detected by using chargerlab power-z kt002. The display supports Samsung 5v2a, DCP protocol, qc2.0 / 3.0, pd3.0 fast charging protocol.

PDO message shows that the usb-c port also has three groups of fixed voltage gears: 5v3a, 9v2.25a and 12v1.7a.

2、 Disassembly of zyxei 20W charger

The charger shell is disassembled, and the pins are sealed and fixed with plastic plates and screws. Metal pieces are set on both sides of the front end of the PCB board, and the pins and metal pieces are contacted and powered on.

The charger adopts the popular combination welding design of three PCB boards, and capacitors, transformers and other components are placed between the interlayer, which can maximize the use of the internal space of the fuselage shell.

iPhone 12 charger port


Through the observation of three PCB boards, it is found that the charger adopts the typical architecture of switching power supply wide range output and secondary protocol chip controlling output voltage. Now we start from the input to understand the components one by one. At the input end, the transformer and high-voltage filter electrolytic capacitor are fixed with yellow glue, and there is a plastic insulation cover between the top of the electrolytic capacitor and the secondary small plate.

A chip fuse, a rectifier bridge, an I-shaped inductor and a PWM main control chip are arranged on the back of the small input board.

Close up of SMD fuse, rated current 2A.

Abs210 rectifier bridge. Summary of dismantling charging head net
iPhone 12 charger port
Zyxei 20W Mini PD fast charging charger not only has foldable pins and small size, but also has metal decorative ring and LED light, which makes the charger look more delicate, which is also one of its selling points. In addition, the corner arc transition of the fuselage is also considered in the design. Small size, portable and easy to use, high appearance, all-round design, for small partners who start with iPhone 12, it is worth considering.

The dismantling of the charging head network shows that the charger is designed with three PCB boards, few components, chip fuse, y capacitor and small I-shaped inductor. In addition, the high integrated on-off power supply scheme is composed of core micro pn8161 master control and mk17360 secondary synchronous rectifier chip, which makes the charger compact. The output terminal uses huinengtai husb338l fast charging protocol chip to identify the protocol and control the output voltage.