Disassembly report: Mi Xiaomi 18W qc3.0 fast charger mdy10ed

Recently, we got two 18W single qc3.0 fast charging chargers mdy-08-es and mdy-10-ed from Xiaomi. Although both chargers are manufactured by Jiangsu Chenyang Electronics Co., Ltd., the former is mainly for the domestic market, while the latter is for the overseas market. We have disassembled the mdy-08-es before. Today, I'd like to share with you the disassembly of the mdy-10-ed to see how the materials and workmanship of the two 18W single usb-a port chargers are different.

The charging head network has successively disassembled the original 27W charger of Xiaomi 9, the original 30W charger of Xiaomi cc9 pro, the original 45W charger of Xiaomi 9 pro and the original 65W charger of Xiaomi 10 pro. Now we will share with you the disassembly of the original 18W fast charging charger of Xiaomi mobile phone (Chenyang) to see how its materials are made.

1、 Xiaomi usb-a port 18W charger appearance

Xiaomi charger adopts PC flame retardant material white body shell, the surface of the body is treated with bright surface paint baking process, the curved surface transition between the sides of the body, the whole is white and smooth, and it doesn't hurt your hand when using.

The input is equipped with a fixed American Standard pin. The input shell is printed with millet logo, and the product parameter information is marked on the fuselage shell in traditional Chinese and English

Model: mdy-10-ed

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

Output: 5V / 3a, 9V / 2a, 12V / 1.5A

Jiangsu Chenyang Electronic Manufacturing Co., Ltd. has passed UL certification, Qualcomm qc3.0 certification, Mexico NOM certification, Brazil Nyce certification and VI level energy efficiency certification.

The top center of the charger is equipped with usb-a interface and white rubber core.

Compared with Apple's 18W charger, the two chargers have the same cross-section size, while Xiaomi's charger is a little longer.

The net weight of the charger is about 55g. The output protocol of usb-a port is detected by using chargerlab power-z kt001. The display supports usb-dcp protocol and qc2.0 and qc3.0 fast charging protocols.

2、 Disassembly of Xiaomi usb-a port 18W charger

Ultrasonic welding is used between the output end shell and the main body shell to remove it. There is a white plastic plate under the usb-a interface motherboard, and the motherboard is also wrapped with a plastic shell to prevent foreign matters from entering the charger.

Take out the charger, there are fixed grooves on both sides of the body shell, which are used to fix the PCB board, and metal contact power is used between the input pin and the PCB board.

At the front of the PCB board, there is an insulating board between the transformer and the interface base for isolation, and the transformer and the surrounding components are glued and reinforced.

There are time delay fuse, NTC surge suppression resistor, power supply capacitor and common mode inductor for PWM main control chip.

The specification of delay fuse is 2A 250V.
iPhone 12 charger
NTC surge suppression resistor close-up, used to suppress the power on surge current.

The common mode inductor is wound by two wires and coated with a heat shrinkable tube to Filter EMI interference.

The common mode inductor is supported by black plastic and fixed by glue.

Close up of power supply capacitor of PWM main control chip, the specification is 50V 4.7 μ F. From Aishi Aihua.

At the side of PCB board, two primary filter electrolytic capacitors, Y capacitors and output filter solid capacitors are welded in turn.

Charging head network learned that the products using Weizhao MOS include Xiaomi 6-port USB charger 60W fast charging version, Zimi 65W USB PD Mini charger, Xiaomi original 30W fast charging charger, vivo 33W flash charge 2.0 fast charging charger, etc. At the same time, Weizhao MOS can also be used in USB PD fast charging mobile power supply, wireless charger and other products, and has been adopted by dozens of products of many brands.

iPhone 12 charger


Details of Intel ip2161. Charging head network learned that the fast charging chip of yingjixin had been adopted by Nokia 7 original charger, DVE Diwen DUOHE fast charging charger and other products. At the same time, other series of fast charging chips of yingjixin have also been highly recognized by the market.

Summary of dismantling charging head net

Xiaomi's 18W fast charging charger mdy-10-ed has a simple design, and its surface is treated with bright baking paint process, so it is white and smooth as a whole. Usb-a interface supports qc2.0 and qc3.0 fast charging protocols, and 18W fast charging power can meet the daily charging needs. The products have passed UL certification, NOM certification in Mexico and Nyce certification in Brazil, mainly for overseas users.
Apple Charger Cable
Through the disassembly of the charging head network, it is learned that the charger has built-in PI highly integrated sc1548c chip and Verizon synchronous rectifier MOS tube, and selects the high pass qc3.0 certification chip ip2161 of British chip as the protocol identification to ensure the output compatibility. The transformer and its surrounding components are glued and fixed; There is insulation board between primary and secondary for isolation; The output is filtered by solid-state capacitor with small ripple; The mother block is wrapped in a plastic shell to enhance protection.