At present, wireless fast charging has become one of the important functions of the flagship phones of major brands, and like wired fast charging, the power is also increasing, and the competition for you to catch up is very fierce. Take OnePlus as an example. Last year’s 8 Pro mobile phone added a wireless charging function, which supports 30W Warp wired/wireless fast charging. OnePlus has specially designed a 30W wireless charger for it, and the charging head network has also done it. Detailed evaluation and disassembly.
This year's OnePlus 9 Pro mobile phone supports 65W wired and 50W wireless Warp flash charging, which ranks among the first echelon of flagship phones in terms of fast charging. Similarly, OnePlus has also specially designed a 50W wireless super flash charger for mobile phones. It can be said to be a second-generation wireless charging product of OnePlus. It has built-in dual coils, supports mobile phone horizontal/vertical wireless charging, and built-in fan support Active heat dissipation. Then we will disassemble this product in detail to see how this new product is designed.
1. OnePlus 50W Warp flash charging wireless charging Appearance
logo design, a classic appearance and a red and white packaging box on the front Sketch.
The five core feature descriptions and parameter information are printed on the back of the product.
A list of everything in the box, including wireless charger, CC cable and instruction manual.
cables are fixed and organized with a cable organizer,The outer skin of the thread body is red, with a skin-like feel.
The plastic shell of the thread head is white, which matches the color of the box.
The length of the whole cable is about 104cm.
OnePlus this 50W Warp flash charging wireless charger continues the previous generation wireless charging ID design, the vertical body comes with a certain inclination, the wireless charging process is more stable, and it is convenient to observe mobile phone messages .
The front of the support plate of the fuselage has a matte finish and has a skin-like feel.
The bottom of the is equipped with a supporting platform and an active air-cooled air outlet.
The convex design on both sides makes it hollow between it and the mobile phone, and blows through the air outlet to take away the heat generated during the wireless charging process.
The side frame is treated with silver pearlescent spray paint.
There is a logo printed on the center of the back of , and a USB-C input interface is provided on the base.
USB-C interface adopts white rubber core,The port is provided with an inner groove, and the wiring is stable and not easy to fall off.
There are anti-skid pads at both ends of the bottom and an air inlet window in the center.
In addition, the wireless charging parameter information is printed on the bottom shell
Model: C302A
3A
3A _span _span
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5 , 20V3.25A
products have passed qi certification.
When wireless charging is performed, the LED indicator on the bottom support platform will light up in green.
This wireless charging support board has built-in dual coils, which can be wirelessly charged in any direction.
A list of horizontal charging scenarios, satisfying the user experience while charging.
2. OnePlus 50W Warp flash charging wireless charging disassembly
tear off the anti-slip mat,There are fixing screws inside.
Remove the screws to open the bottom plastic window. The first thing that catches your eye is the fan, which is fixed with screws.
The bottom of the fan is a black plastic shell, made of PC material, and the small board where the USB-C female seat is located is also fixed with screws.
also disassemble the support plate, and fix the coil on the middle layer plastic shell. The plastic shell is fixed with buckles and screws. The black plastic wind shield below is used for sealing and blowing out cold air Heat dissipation.
Continue to remove the middle plastic shell to take out the wireless charging circuit board from the base. The PCB board is fixed on the black plastic shell with screws, and the back is covered with the shielding cover and copper foil .
USB-C female socket is welded on the small board, and it is connected to the wireless charging circuit board through a cable.
The wireless charging coil of the output terminal is soldered to the PCB board, and the solder joints are full.
The black plastic shell is also fixed with a small LED indicator plate, and the protrusion is the wind guide structure.
This wireless charger consists of four parts: PCB control board, fan, LED light board, and wireless charging coil.
After removing the shielding cover, the buck converter and coil drive MOS tube on the board are coated with light green thermal gel to help heat conduction, and the shielding cover corresponds to inductance , MOS tube, etc. The hollowing process makes the inductor and thermal conductive gel directly contact the copper foil for heat dissipation.
The front view of the PCB board, as can be seen from the circuit layout, the OnePlus 50W wireless charger has a secondary transformer power supply circuit architecture. Below we start from the input terminal and introduce the entire circuit and the information of each chip in detail.
There are three solid filter capacitors on the other side.
USB-C female close-up, the outer cover steel sleeve is spot welded and reinforced.
TVS protection tube for USB input.
TVS tube for input overvoltage protection.
Close-up of three SMD solid capacitors, the specifications are all 35V 47μF.
The main control MCU of silk screen G0718N,Responsible for voltage regulation control and cooling fan control.
MPS MP2491C synchronous rectification step-down converter, the highest input voltage is 32V, the output current is 6A, and it supports programmable current limit. It is used to step-down power for wireless charging main control, fan, etc.
MPS MP2491C Details.
MPS MP4247 synchronous buck-boost converter, built-in two lower tubes, working voltage 3.6-36V, maximum 5A output current, support I2C configuration, suitable for USB-PD charging devices, outside the upper tube The internal integrated down tube can reduce the area and disperse heat at the same time. It is used for the internal voltage conversion of the wireless charging and adjusts the voltage according to the demand of the mobile phone.
There are two AOS Bandai AON7380 MOS transistors, NMOS, 30V withstand voltage, and MP4247 external buck-boost switches.
Bandai AON7380 data information.
A close-up of another Bandai AON7380. These two MOS tubes are used with the two lower tubes inside the MP4247 to form the H-bridge buck-boost.
4R7 alloy buck-boost inductor close-up.
wireless charging main control chip adopts IDT IDTP9247,Built-in power tube driver for wireless charging transmission control.
IDT program unique external memory, using Winbond Winbond serial NOR flash memory W25X40CL, used to store wireless charging configuration.
Winbond W25X40CL detailed information.
8 Bandai MOS tubes, the models are AON7380 and AON7262E, a group of four form an H bridge, which is used to drive two wireless charging coils.
Bandai AON7262E data information, NMOS, withstand voltage 60V.
Close-up of two groups of NPO resonant capacitors, each group uses three in parallel.
The wireless charging coil is tightly wound and equipped with a thermistor for temperature monitoring.
Close-up of another coil.
The fan comes from Dongguan Hongying, with a rated input of 5V0.4A.
LED board close-up,Solder white and green indicator lights.
are all dismantled, let’s take a family portrait.
charging head net disassembly summary CC data cable, adapter users can choose flexibly according to the situation. This wireless charger supports 5V4A, 9V2A, 10V6.5A, 20V3.25A input, whether it is the standard 65W Warp flash charger for all OnePlus 9 series, or the 65W PD fast charging charger that is currently common on the market. Match it well.
The charging head net was disassembled and found that although the model ID has not been changed much, the internal layout has changed a lot compared with the previous generation. The support plate has built-in dual coils, and the wireless charging experience is further improved; at the same time, the cooling fan is moved to the base, and the air is guided through a specially designed plastic shell to achieve the dual heat dissipation effect of the circuit board and the support plate.
This product uses MPS MP2491C and MP4247 for step-up/step-down to achieve wireless charging circuit power supply and mobile phone demand voltage conversion. In addition, IDTP9247 is still used to control Bandai's coil drive MOS tube for output. Solid capacitors are used for input and output filtering, the entire wireless charging circuit is covered with a shielding cover, the MOS tube is coated with thermal conductive glue to help dissipate heat, and the overall design materials are also very particular.
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