Xiaomi 90W USB PD fast charging charger is disassembled, and the materials are really fierce
In August 2018, Xiaomi released the pro 15.6 ″ GTX version of Xiaomi notebook, which is equipped with the eighth generation core processor and GTX 1050 max-q independent graphics card, with strong performance. Strong performance is destined to have high-power power support. According to previous experience, it is equipped with brick like power adapter. Fortunately, this notebook of Xiaomi supports usb-c power supply, and Xiaomi also configures a small 90W usb-c PD charger for it.
Previously, the charging head network has brought you a detailed evaluation of this charger, and disassembled the attached 100W usb-c to usb-c cable. Next, Xiaobian will continue to share the internal disassembly of this 90W USB PD charger of Xiaomi.
1、 Appearance of Xiaomi 90W USB PD fast charging charger
The appearance of Xiaomi 90W PD charger is the same Xiaomi style as before, with white bright surface shell and single usb-c port design. From the above figure, the surface of the shell is very simple and clean without any brand or word logo.
Charger as a whole is more founder, but founder also has a round side. Fillet transition is made at the junction of the waist surface, the top surface and the bottom surface, so that the charger will not be too rigid as a whole, and the handle can also be balanced.
Let's take a look at the pin side. The shell of this side is made of matte gray material, printed with millet logo and relevant parameters of the charger. In addition, this Xiaomi 90W PD charger adopts a folding pin design, which is convenient for storage and carrying.
Let's take a look at the specific parameters of Xiaomi 90W PD charger: model: adc90tm; Input: 100-240V ~ 50 / 60Hz 1.6A; Output: 5V / 3a, 9V / 3a, 12V / 3a, 15V / 3a, 20V / 4.5a; Manufacturer: Beijing Tianmi Technology Co., Ltd. Beijing Tianmi Technology Co., Ltd. is an ecological chain company of Xiaomi notebook computer.
In terms of volume, Xiaomi 90W PD charger is slightly larger than Xiaomi 45W and 65W PD charger.
The chargerlab power-z kt001 is used to detect the fast charging protocol of the charger. The display supports USB DCP, qc2.0 and qc3.0 charging protocols.
The PDO message of usb-c interface shows that the charger supports USB pd3.0 fast charging protocol, and has four voltage ranges of 5V / 3a, 9v3a, 12V / 3a, 15v3v and 20V / 4.5a, with a maximum power output of 90W.
2、 Disassembly of Xiaomi 90W USB PD fast charging charger
Open the shell from the pin side of the charger, the shell is welded by ultrasonic wave, and the inner side of the pin is wrapped with Marla tape for insulation.
Take out the internal circuit board, and use copper sheet on the front of the circuit board for heat dissipation.
The back of the circuit board is also covered with a large area of copper heat sink.
Remove the front copper fin and fill the components with silica gel to fix the components and conduct heat. The back of PCB board is at a glance. Remove the front filled with silica gel, the basic shape of each component can be seen.
The input end is equipped with safety capacitor, common mode inductor, input rectifier bridge, film capacitor and other devices.
Summary of dismantling charging head net
The mini 90W PD charger maintains family ID design in appearance, white bright surface shell, and reveals a round shape in square, keeping the previous level in weight, and lighter than the same size apple 87W charger. As a few super power PD chargers on the market, this kind of millet charger performs well in actual test. It supports five PD gear outputs of 5V, 9V, 12V, 15V and 20V, with the maximum power of 90W. It eats mobile phones, tablets and laptops, and almost has no PD equipment which can not be satisfied with in power.
Through the disassembly of the charging head network, it is found that the charger has added PFC power factor correction circuit to the input end. The power supply part adopts a complete set of NXP NXP controllers, while the protocol part uses Weiquan wt6615f as usb-c PD controller, compatible with qc3.0 and qc2.0 fast charging protocol, and the first-line factory switch tube and capacitor are used in the inner part. Besides the solid materials, this product is also very careful in the process, and the components are arranged orderly, and a large number of silica gel are used to fix and heat conduction; PCB module uses large area copper plate to evenly heat out, avoid local overheating during long-term high-power operation, and improve user experience.