With the rapid development of smartphone, people tend to pursue fast charging approach to phones. At present, there are two quick charge technologies: one is Qualcomm’s high-voltage quick charge, and the other is VOOC’ low voltage high current quick charge. Two quick charge methods have their advantages. The high voltage quick charge has no particular requirement on cable material, and it has good compatibility while low voltage high current quick charge needs particular cable material from manufacturer except protocol.
The quick charge technology that Huawei first apply to its phones is high-voltage FCP. Later, Huawei has adopted SCP technology which uses low voltage high current scheme. Now, we will do some tests on Huawei’s quick charger which adopts SCP technology and then starts the teardown on it.
The quick charger’s model number is HW-050800C1WH. Output parameter is 5V 2A, 5V 8A.
The quick charger has a white shell.
The charger can be folded, which is convenient for the user to carry.
It shows the specs of the charger. The model number is HW-050800C1WH. The output voltage is 200-240V. The output is 5V 2A/5V 8A MAX. The charger is manufactured by Huawei Technologies CO., LTD. It has got the 3C certificate.
The charger provides an orange USB-A port with widening contact spring.
Huawei’s other 4.5V/5A charger which adopts SCP technology is on the left. The 5V/8V charger supporting SCP technology is on the right.
They have a different design on the USB port.
The 4.5V/5A charger can’t be folded while the 5V/8A charger can be folded.
The charger’s width measures 46mm.
Its thickness is 28mm.
Using ChargerLab power-z FL001 protocol to test the charger, we find that it only supports SCP technology.
These are Huawei’s several quick chargers: SCP 8A charger, PD charger SCP 5A charger and FCP+QC2.0 charger. (From left to right).
USB port comparison between four single-port quick chargers.
First, use the ChargerLab Power-2 FLD01 to test the charger. When the charger enters SCP mode, use EBC-A10 to test its maximum power. We can see that t shows 8A.
We have tested twice, and each result shows 8.2A.
Huawei 5V 8A charger’s power test. The software records its maximum current reaches 8.1A.
After testing the 5V 8A charger fully loaded for two minutes, it still works well.
Teardown
Remove the shell.
Pull out the PCB module.
It is composed of two pieces of PCB. The middle part is back glue, which aims to fix the whole structure and help heat conduction.
There is also plastic housing which is used to fix the circuit board.
After removing two PCB, we can see that the white plastic housing is sued to connect two circuit boards on the top and bottom.
This is a transformer from PULSE. But we haven’t found the model on the PULSE official website. So this transformer is likely to be a customized type.
Circuit board on the left is RT7207 which supports synchronous rectification.
The synchronous rectifier has parallel Schottky barrier diode to improve efficiency. It is ON Semiconductor NTMFS5C6KNL. Silk screen 5C612L.
Output switch. Diodes PMOS DMP2002UPS.
2512 3 mΩ alloy resistance is used to detect the output current and close the output process when detecting abnormal current.
There are two solid capacitors on the output board’s front. The fuse with AC input is on this board.
RT7786 is a primary PWM.
Three MLCC in series is the traditional blue Y capacitor. The three MLCC in series can improve insulation capability.
The input fuse is spotted on the other circuit board. The thermistor is between the X capacitor and coil.
It adopts Lelon’s capacitor.
400V/22μF
It is switch tube STFU13N65M2.
