Recently, the charging head network got a 20W PD fast charger GS-W20A0924B from Gushi Technology, which supports QC, PD3.0 and other fast charging protocols, supports 9V2.22A output, and the maximum power of 20W can meet the daily fast charging needs of Apple's iPhone 12/13 mobile phones.
The charging head network understands that this charger adopts the classic QR switching power supply architecture design, while the switching power supply scheme uses the KP22306+KP41262 series high-integration solution of Biyiwei. The following charging head network will disassemble this charger in detail to see how it is designed.
It is worth mentioning that the charging head network also disassembles the Gushi Technology mini 30W Gallium nitride fast charger, 25W PD fast charger, mini 20W PD fast charge, 20W cookie charger and other styles for customers to choose.
First, the appearance of The 20W charger of Gushi Technology
The front of the box is printed with a sketch of the charger and its name.
A brief picture of the use of the product and precautions are printed on the back.
The package contains a charger, instruction manual and certificate of conformity.
The appliance adopts PC material white shell, waist height bright surface treatment, the two sides are transitioned round, the output top surface is slightly concave, and the overall style is simple.
The charger adopts fixed GB pins, and the charger parameters are printed on the input shell
Model: GS-W20A0924B
Input: 100-240V 50/60Hz 0.6A
Output: 5V3A, 9V2A, 9V2.22A
Total output power: 20W Max
Manufacturer: Shenzhen Gushi Technology Co., Ltd
The charger has been CCC certified.
The top surface is equipped with a single USB-C port and is centered.
The measured charger body height was 43.95mm.
The width is 42.89mm.
The thickness is 26.45mm.
Compared with the Apple 20W charger, it is slightly larger.
Intuitive feeling in the hand.
The net weight is about 49g.
The USB-C port measured using the Chargelab POWER-Z KT002 supports Apple 2.4A, Samsung 5V2A, DCP protocol, and QC2.0/3.0, AFC, FCP, PD3.0 fast charging protocol.
In addition, the PDO message shows that the C port also has three sets of fixed voltage gears of 5V3A, 9V2.22A, and 12V1.67A.
Second, gushi technology 20W charger disassembly
The input housing is disassembled, the ultrasonic solder package is soldered, and the internal module is glued and reinforced.
The welding of the connecting wire is also glued.
The measured module length is 39.02mm.
The width is 36.74mm.
The thickness is 18.55mm.
At a glance at the front of the PCB board, capacitors, transformers, etc. are glued and reinforced.
At a glance on the back of the board, there is a fairing bridge and a switching power supply primary chip, and the primary secondary demarcation of the board is obvious.
At a glance at the input terminals, safety resistors, I-beam inductive jacketed insulated tubes.
Close-up of the safety resistor.
NTC surge suppression resistor close-up for suppressing uprush current.
Close-up of abs210 rectifier bridge.
Close-up of the I-beam inductance.
The side features primary filter capacitors, Y capacitors, and optocouplers.
On the other side is a main control chip power supply capacitor and a transformer.
Two high voltage filter electrolytic capacitors from Coctograph are both 400V 15μF.
Close-up of the main control chip power supply capacitor, the specification is 50V 10μF.
The switching power supply main control chip adopts Biyi Micro KP22306WG, which is a high-performance quasi-resonant current mode PWM conversion chip for offline flyback converters. The integrated high-voltage start-up circuit can obtain fast start-up and ultra-low standby performance; the chip supports 8-40V VDD power supply to meet the requirements of wide voltage output power supply.
The KP223XX features a high-precision 80KHz switching frequency oscillator with frequency modulation and current peak modulation to optimize EMI performance. The chip combines quasi-resonant control mode, green energy-saving mode and hiccup mode to optimize efficiency in a full range and achieve standby power consumption of less than 30mW to meet the energy efficiency requirements of six levels.
KP223XXWG integrates complete protection functions, including: VDD undervoltage protection (UVLO), VDD overvoltage protection (VDD OVP), input undervoltage protection (Brownout), input overvoltage protection (LOVP), output overvoltage protection (OVP), cycle-by-cycle current limiting (OCP), abnormal overcurrent protection (AOCP), overload protection (OLP), output overcurrent protection (SOCP), short circuit protection (SCP), built-in overtemperature protection (OTP), Soft-start, forefront blanking (LEB), and more.
The unique ASOP6 package provides better thermal performance. This series of products use different built-in MOSFETs, of which KP223315AWGA can meet the needs of 30W fast charging, excellent performance, small size.
In addition, Biyiwei also launched KP22035WGA products, 8 ~75V wide VDD voltage range, to meet the needs of customers 3.3 ~20V wide range 30W fast charging
The charging head network disassembly learned that the Biyi micro-fast charging chip was also adopted by Anker foldable mini 20W fast charge, NEOQUICK 65W 2C1A three-port fast charge, Yilike 45W PD fast charge charger, THEONE 65W 1A1C fast charge charger, Zimi new 20W PD fast charge, Pinsheng mini 20W 1A1C fast charge, Augi 20W PD fast charge, Nubia 22.5W sugar cube fast charge and other fast charging products.
Transformer close-up, from Xingda Weiye.
Y capacitance close-up.
JC817 optocoupler for output voltage feedback.
The secondary synchronous rectification chip also adopts Biyi Micro KP41262SG. This is a high-performance synchronous rectifier power switch that replaces the secondary-side Schottky diode in flyback converters with an ultra-low on-resistance MOSFET built in to improve system efficiency. Supports High Side and Low Side configurations, as well as system intermittent operating mode (DCM) and quasi-resonant operating mode (QR).
Biyi micro KP41262SG data information.
The output filtered solid capacitor is from Fujian Yunxing Electronics and has a specification of 16V 680μF.
At a glance at the output, the USB female seat is soldered to the small board.
Remove the small board and have an output VBUS switch on the front.
On the other side there is a protocol chip.
The PD fast charging protocol chip adopts the CLOUD Silicon Semiconductor XPD320. It supports fast charging protocols such as QC2.0/3.0/3.0+, AFC, FCP, SCP, PD3.0 and PPS, and the PDO can be configured with 5V, 9V, 12V, and the maximum output power is as high as 36W. Supports overvoltage/undervoltage protection, CC1/CC2/DP/DM overvoltage protection in ESOP8 package.
Silicon Semiconductor XPD320 data information.
Charging head network disassembly learned that Yunsi Semiconductor XPD series fast charging protocol chip has been adopted by Bull, Belkin, Lenovo, Nokia, Philips, Aoji, Bess, Pinsheng, Momix and other brands of dozens of products, grasping the 20W PD fast charging outlet, Fuman Group Yunsi Semiconductor single-month PD protocol chip sales exceeded 10 million.
The output VBUS switch tube adopts Huarui Micro HRT30P13J, PMOS, withstand voltage 30V, DFN3* 3_8L package.
All disassembled, let's take a family portrait.
Charging head net disassembly summary
Gushi Technology this charger is based on Biyi micro KP22306 + KP41262 QR switching power supply scheme design, the program integration is high, the circuit board looks very simple is also thanks to the blessing of this program, the design is very simple, help engineers to design new products including popular mini charger, fast charging, while in terms of cost, accelerated listing and other aspects are more advantageous.
In fact, in the 20 ~ 30W power range, Biyiwei also has KP22306/8/15+KP41262 full range of high-integration solutions for customers to choose, even if the iPhone 13 Pro Max new machine supports 27W fast charging, based on the above programs of Biyiwei can design the corresponding fast charging products to meet the market demand.