18W mobile phone is equipped with 27W charger, Lenovo Z6 Pro original charger depth dismantling

After Lenovo released the new Z6 pro in the first half of the year, it attracted a lot of discussion on the Internet. The reason is that Lenovo Z6 Pro mobile phone itself supports 18W fast charging, but the standard configuration is a 27W fast charging charger, which makes many consumers mistakenly think that the mobile phone also supports 27W fast charging.

Recently, the charging head network got Lenovo's 27W USB PD fast charging charger. Let's share the detailed disassembly of this product and see how the materials are used.
1、 Appearance of Lenovo 27W qc4 + fast charging charger

Lenovo's 27W USB PD charger is made of pure black shell, PC flame retardant material and matt surface. The charger is equipped with national standard fixed pins, and the logo of Lenovo brand is printed on the front.

The output usb-c interface of the charger is set in the middle, with a blue rubber core. The end face does not expose copper, and the hole of the interface is chamfered.

The detailed parameters of the product are printed on the pin side, the model is sc-38, the input is 100-240V, 50 / 60Hz, 0.8A; the output is 5V / 3a, 9V / 3a, the product has passed CCC certification, and can pass the U.S. VI level energy efficiency certification. The manufacturer is Xiamen Taihe Electronics Co., Ltd.

The thickness of the charger is equivalent to the diameter of a one yuan coin. The net weight is about 62g. Compared with apple 18W USB PD charger, the thickness is relatively thin and the length is slightly longer. Using chargerlab power-z kt001 to detect the PDO gear of the charger, the display supports two fixed voltage output gears of 5V / 3a and 9V / 3a, and two PPS voltage gears of 3-5.9v/3a and 3-11v/3a. At the same time, other protocols of the charger are detected, and apple 2.4a, DCP, qc3.0, qc2.0 and other protocols are supported.

2、 Disassembly of qc27w + Lenovo charger

The charger is ultrasonic welded, which is easy to disassemble and can be pried off directly. The end of the AC pin of the charger uses two shrapnel to contact and conduct electricity with the PCB. After removing the AC pin cover, you can see the internal PCB module, and the input components are fixed with silica gel.

After removing the internal PCB module, a metal heat sink can be seen on the inside of the charger shell, and a plastic plate is used for insulation treatment. Front view of PCB board. Three electrolytic capacitors are used in the input filter and two solid capacitors are used in the output filter. White silica gel is used to fill the gap between the primary capacitor and the transformer to fix the components and heat dissipation.

PCB input, common mode inductor, NTC surge suppression resistor and fuse are wrapped with black sleeve and fixed with glue injection. Two of the three input filter electrolytic capacitors are 18 μ f 400V. Between the two capacitors is an I-shaped inductor, and a Y capacitor is set on the edge side. The other capacitor is 10 μ f 400V. The power supply capacitor of PWM chip is 10 μ f 50V. The blue y capacitor is used for output anti-interference. The Yellow Marla tape on the transformer is printed with spray code information. The transformer secondary adopts multilayer insulated wire. From the output side, the usb-c interface adopts small PCB board welding, the small PCB board is parallel to the main PCB board, and there is a support frame and a welding pin fixed. The two PCB boards are supported by a plastic framework. In addition to usb-c interface, protocol chip and VBUS switch are set on the protocol board, and the terminals are protected by voltage stabilizing tube. USB PD protocol chip is from welrend Weiquan, model wt6633p. Weiquan welrend wt6633p USB PD control chip is one of the few PD controllers certified by qc4 and qc4 +, with built-in usb-pd physical layer, type-C cable detection, built-in voltage regulator, voltage and current monitoring function, load switch control, and right R005 output sampling resistance. Usb-c interface output VBUS switch, screen printing 1233. The output filter adopts two solid-state capacitors in parallel, and the specifications are 470 μ f 16V. The back of PCB board looks very simple. The input end is a rectifier bridge. The main control chip of charger is between primary and secondary, and the secondary side is synchronous rectifier MOS tube. Input rectifier bridge, fmb30m. The main control chip of the charger comes from the primary main control chip of PI, model inn3266c, which has built-in controller, switch tube and secondary synchronous rectifier controller, with high integration; after PCBA is installed into the shell, the chip directly fits with the heat sink on the inner wall of the shell, ensuring good heat dissipation performance. Charging head network learned that this chip is also used by kunxing 27W qc4 + charger.

Summary of dismantling charging head net

As a standard charger for mobile phones, Lenovo 27W USB PD fast charging charger is small in size, simple in appearance, and its surface is matte, so it is not easy to be scratched. In terms of protocol, it not only supports USB pd3.0 PPS protocol, but also compatible with apple 2.4a, qc3.0, qc2.0 and other protocols.

According to the disassembly of charging head network, this product uses the latest PI in3266c controller internally, with integrated switch tube, controller and synchronous rectifier controller internally, with few peripheral devices, which is conducive to saving PCB position and improving power density. The secondary side adopts the high pass qc4 + Certification chip wt6633p provided by Weiquan as the protocol control. The materials and workmanship of the product are quite solid, and the product performance is also guaranteed.