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Tear down of Huawei 40w supercharge wireless charger stand CP62

Unbox of HUAWEI 40w superfast wireless charger

At 21 o'clock on March 26, 2020, Huawei P40 series global online conference launched three models: P40, P40 Pro, and P40 Pro +. Among them, Huawei P40 Pro + is equipped with a 40W ultra-high-power wireless superfast charge, and P40 Pro is equipped with 27W wireless fast charge. At the same time, these two models also support reverse wireless charging, which can charge other mobile phones and TWS headsets.
In order to enable Huawei P40 Pro + to achieve 40W wireless charging, Huawei also launched a new 40W super-fast charging wireless charger. This product uses a vertical design and is equipped with two coils, which can be wirelessly charged regardless of whether the phone is placed vertically or horizontally. The charging head network placed the order and purchased this product for the first time, and then I will share with you the internal disassembly of Huawei 40W super-fast charging wireless charger.
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First, the appearance of Huawei 40W super-fast wireless charger
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The back of the box printed with product selling points and parameters.
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The products inside the packaging box are fixed and buffered by paper lining, and the protection is in place.
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The body part of Huawei 40W super fast stand design wireless charger is mainly composed of two parts. The main part is made of aluminum alloy material, anodized and sandblasted. The base part is made of PC material.
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The bottom of the front is used to support the mobile phone with an arc slot, and a silicone anti-skid pad is attached to protect the mobile phone. Between the glass and the arc slot is a heat vent.
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The sides of the high-gloss glass have raised frame design, and the bottom fan blows air from the back cover of the phone and the glass panel to remove heat.
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The USB-C interface is set down behind the base.
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The bottom of the wireless charger has a large area of openings, and four silicone anti-skid pads on the edge raise it to facilitate the inhalation of cold air from the outside and enhance the heat dissipation effect. Product parameters are printed on both sides of the opening, model: CP62; input interface: USB Type-C, input support 5-20V, maximum current is 5A, the product has passed the Qi certification of WPC wireless charger alliance.
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Through the cooling holes, you can vaguely see the internal cooling fan.
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When powered by Huawei's latest 65W USB PD fast charging charger. ChargerLAB POWER-Z KM001C measured a no-load voltage of 11.97V, a current of 0.02A, and a no-load power of about 0.25W.
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Use Huawei 40W super fast charging wireless charger to charge Huawei Mate30. The phone shows that it is in super fast charging state. At this time, the indicator light on the bottom of the wireless charger lights up.
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ChargerLAB POWER-Z KM001C test: input voltage is 16.43V, current 1.96A, power is about 32.22W, 27W wireless fast charging mode is turned on.
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When the phone is placed horizontally, it can still turn on the super fast charging wireless charging mode.

Second, disassemble of Huawei 40W super-fast wireless charging stand

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The design of the Huawei 40W super fast charging wireless charger is very clever. There are no screws under the anti-skid pad on the base, and the entire base shell is bonded together with double-sided adhesive. After disassembling the base shell, you can see a cooling fan. The yellow PCB board next to it is a small board for USB-C interface. It is fixed on the shell and has a wide cable for passing large currents.
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Remove the heat dissipation fan, and install the air guide groove on the back to send air to the panel. The inside of the base is the main control PCB board, and the capacitor on the top is reinforced with silicone.
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Close-up of the centrifugal cooling fan and air duct.
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The PCB board inside the base is designed in a U-shape according to the shape of the base. The green PCB board is covered with edges and processed with gold.
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After the base is disassembled, the wireless charger cannot be completely disassembled, so continue to open the front panel. Below are two wireless charging transmitter coils, each with a thermistor in the middle of the coil for temperature monitoring.
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The shell of the coil part is made of aluminum alloy, the base is made of plastic, and the two are assembled together by two screws. However, these two screws are placed under the magnetic separator of the coil, which is very laborious to disassemble.
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Originally I wanted a non-destructive disassembly, but due to the abnormal close adhesion between the magnetic shield and the metal shell, the magnetic shield was broken during the disassembly process.
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Anyway, the two shells were successfully separated in the end. The two coils and the thermal probe pass through the opening of the metal shell and are soldered to the PCB.
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The input end of the PCB board is connected to the USB-C interface by an FPC flexible circuit board; two control chips are mainly distributed on the back, one of which is the SC8701 buck-boost controller of the south core, and the other is the wireless charging main of Yi Chong Semiconductor. Control chip CPS7101. In the upper right corner, there is a chip inductor for buck-boost. The 8 MOS tubes below the inductor form a wireless charging drive and switching circuit. It is controlled by the easy-charge wireless charging main control chip and is used for the switching and driving of two sets of coils. The PCB edge is covered with via holes to block electromagnetic radiation.
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Huawei 40W super fast charging wireless charger uses a Southchip synchronous buck-boost controller SC8701 as the power supply hub for the entire system, which is used to adjust the input voltage of the USB-C port to a voltage value that meets the needs of the transmitter. So that this wireless charger can be used with more power adapters.
We learned that Nanxin SC8701 is a synchronous 4 switch buck boost controller, which can effectively output voltage, whether it is high, low or equal to the input voltage. It also supports a very wide input and output voltage range, which can support an input range of 2.7V to 36V and an output range of 2V to 36V. The driver voltage is set to 10V to fully utilize the external mosfet to achieve the highest efficiency, which is used for Type-C interface buck-boost voltage conversion.
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The wireless charging main control chip is equipped with a passive SMD crystal oscillator.
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Four AOS MOS tubes are used for wireless charging coil switching, AON7262E, NMOS, withstand voltage of 60V, and opposite series connection Adopt DFN3X3 package, saving volume.
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Summary of HUAWEI 40w supercharger wireless charger stand

In terms of appearance, Huawei 40W super-fast charging stand adopts a brand-new design, which perfectly combines metal materials, PC materials, and high-gloss glass, and it exudes a full sense of technology. It is understood that Huawei has only launched horizontal wireless chargers and car wireless charging brackets, so the launch of this vertical wireless charger has further enriched Huawei's accessories in this field, and users have more choices.
The disassembly of the charging head network head revealed that Huawei's 40W super-fast charging stand wireless charger uses a dual-coil design, and the PCB board design is very streamlined. This also benefits from the adoption of Yi Chong Semiconductor ’s highly integrated wireless charging SOC. The chip realizes the control of two coils and supports 40W wireless fast charging under Huawei's private agreement. At the same time, the Nanxin SC8701 is used as the power supply hub of the wireless charging module, so that this wireless charger supports PD power supply and 5-20V input voltage to achieve the effect of not picking the charger.
In order to solve the problem of wireless charging and mobile phone heating when working at high power, this wireless charger is also equipped with an active heat dissipation system. The fan enhances the air convection between the coil and the mobile phone, which plays a role in cooling. The entire product uses materials It is exquisite and reasonable in design; it is manufactured by Lixun Precision, and the manufacturing process belongs to the first-class level in the industry.
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