The charging head network got a dual-port gallium nitride charger launched by the well-known fast charging brand Huntkey, this charger model is G35 Pro, the output power is 35W, and it has two USB-C output interfaces. The charger has a cube-shaped design and fixed pins, making it very compact.
After actual testing, it was found that this charger has a 20V output voltage range and supports 55-11V 3A PPS fast charging, also supports 55-11V 3A UFCS converged fast charging, which has very good compatibility for laptops and mobile phones. Let's bring the dismantling of Huntkey's 35W gallium nitride fast charger, and let's take a look at the internal workmanship and materials.
The front of the box is printed with the Huntkey brand, the appearance of the charger, the 35W power, the four major selling points and the 24-month warranty logo, and the product name and a very scientific and technological circuit style design below.
The back is printed with charger parameters, brand information, etc.
Close-up of the charger parameters on the back of the box, let's introduce it to the physical display of the product.
The charger and instruction manual are included in the package.
The charger is made of classic white fireproof material shell, and the surface of the fuselage is glossy and matte color contrasting, and the overall style is simple, light and compact.
The waist side is printed with the Huntkey brand.
There is also a 35W logo design on the right side of the brand, which can give people a visual idea of the output power of this charger.
The charger is equipped with fixed GB prongs.
The input housing is printed with the detailed parameter information of the charger.
Close-up of product parameters.
Model: HKC03520018-0D1
Input 1: 200-240v 50 60hz 12a
Output 1: USB-C1 C2: 5V3A, 9V3A, 12V291a、15v2.33a、20v1.75a、5.5-11v3a max
Dual output: USB-C1 C2: 5V2A, 9V2A, 12V15a max
Input 2: 100-130v 50 60hz 12a
Output 2: USB-C1 C2: 5V3A, 9V3A, 12V25a、15v2a、20v1.5a、5.5-11v3a max
Dual output: USB-C1 C2: 5V2A, 9V2A, 12V15a max
Manufacturer: Shenzhen Hangjia Chiyuan Electric Co., Ltd. ***
The charger is CCC certified.
The output terminal is equipped with dual USB-C interfaces, and USB-C1 and USB-C2 are printed next to the interfaces, which is convenient for users to use differently.
The measured height of the charger body is 3816mm。
The width is 3391mm。
The thickness is 3394mm。
Compared with Apple's 30W charger, Huntkey's 35W dual-port charger is much smaller.
Feel the size of the charger in your hand.
In addition, the weight of the charger was measured to be about 65g.
The USB-C1 port is measured by ChargerLab Power-Z KM003C, which supports UFCS, FCP, SCP, AFC, and QC30/4+、pd3.0、pps、dcp、apple 2.4A charging protocol.
PDO packets show that the USB-C1 port also has 5V3A, 9V3A, and 12V291a、15v2.33a、20v1.75A five sets of fixed voltage levels, as well as 55-11V3A set of PPS voltage ranges.
UFCS fast charging has been measured to have 55-11V3A set of voltage ranges.
It was measured that the USB-C2 port is compatible with the same protocol as the USB-C1 port.
The same is true for PDO packets. The output performance of the two USB-C ports is exactly the same, and it supports power blind plugging.
After reading the unboxing and display of Huntkey's gallium nitride fast charging, let's disassemble it and take a look at the internal workmanship and materials.
Start by prying open the charger housing along the housing seams.
There is a PCBA module inside the housing, which is fixed by a card slot.
The inside of the shell is potted design, and the internal PCBA module is taken out by cutting the shell.
The PCBA module is powered by shrapnel crimping.
The PCBA module is filled with thermally conductive adhesive potting.
The length of the PCBA module measured by vernier calipers is about 345mm。
The width of the PCBA module is about 304mm。
The height of the PCBA module is about 3055mm。
Clean up the potting glue filled by the PCBA module, the PCBA module is composed of two small plates welded, and a plastic insulated shell is provided between the planar transformer and the high-voltage capacitor.
The other side is welded with a planar transformer and an output plate.
The front of the PCBA module is soldered with input fuse, NTC thermistor, common-mode inductor and differential-mode inductor in the upper right corner, planar transformer soldered on the left side, and high-voltage filter capacitor soldered on the right. The bottom is welded to the step-down output plate.
The back of the PCBA module is welded with a rectifier tube, a gallium nitride sealed chip, a feedback optocoupler, a synchronous rectifier controller and a synchronous rectifier tube.
Two step-down chokes and three filter capacitors are welded to the output plate.
Through the observation of the PCBA module, it is found that the Huntkey 35W gallium nitride charger adopts flyback switching power supply, synchronous rectification, and fixed voltage output. The output adopts two independent synchronous step-down circuits to realize the fast charging output and automatic power distribution functions of the two interfaces. Let's start with the input to understand the design and materials of the entire charger.
List of PCBA module inputs, soldered chip fuse, NTC thermistor, high-voltage filter capacitor, soldered planar transformer on the right side.
The input fuse is from Better Electronics, and the specification is 315a 250v。
The silkscreen 2R5D NTC thermistor is used to suppress the inrush current on the power-up.
The common mode inductor is wound with enameled wire and insulated wire, insulated by a heat shrinkable tube, and welded with an insulating bracket at the bottom.
Four diodes are used inside the charger to form a rectifier bridge, two of which are soldered on the front of the PCB, and LRS2MF is silk-screened.
Two rectifier tubes of the same type are welded on the back.
The high-voltage filter capacitor is from Warwick with a specification of 22 F400V and a total capacity of 44 F.
Differential mode inductor jacket heat shrink tube insulation.
GaN Sealed Chip Silk Screen JW81566A.
The filter capacitors that power the GaN encapsulated chips are from Aihua and are 100V47μf。
Planar transformer core jacket insulated plastic shell.
The planar transformer is removed from the plastic case, and the transformer core is shielded with copper foil winding.
According to the UL certification number (E248779) on the PCB board, the planar transformer is provided by Victory Giant Technology.
The two SMD Y capacitors are from Huaxinan, and they are connected in series to improve the withstand voltage level.
The CT1019 optocoupler is used for output voltage feedback.
The synchronous rectifier controller is from Jevert, silk screen JWEWJ.
The synchronous rectifier tube is from Pingwei, model PW055N10ESL, NMOS, withstand voltage 100V, conduction resistance 44M, in DFN5*6 package.
The output filter capacitor is from the Emerald, CH series solid capacitor with a specification of 220 F25V.
Magnetic ring inductors are used for output filtering.
The output buck plate is welded with three filter solid state capacitors and two buck inductors, a protocol chip and a synchronous buck converter.
A synchronous step-down converter and VBUS switch are welded on the back of the board.
The protocol chip adopts Yingjixin IP2738U, which is a protocol chip that supports multiple USB interfaces, supports dual-port 18-140W fast charging applications, has independent feedback control, and has independent USB PD control, which is equivalent to two IP2736 integrated into one chip, and the fast charging specifications are the same as IP2736. Support USB PD31 28V EPR gear, support UFCS fusion fast charging, and support PD30 pps and other rich and comprehensive fast charging protocols, compatibility is very good.
Yingjixin IP2738U has four built-in independent NMOS drivers, which can be used for output control of multiple interfaces, control multiple VBUS switches for output port switching and parallel control of two power supplies, and support dual independent over-current, over-voltage and short-circuit protection to ensure safe use.
Yingjixin IP2738U data information.
The synchronous step-down converter used with it is from Nanxin Technology, model SC8103, which is a high-efficiency synchronous step-down converter with an input voltage from 4From 6V to 36V, the output voltage is adjusted by setting the voltage divider resistor; It also provides high precision output current limit, when the output current reaches the set current limit, the inverter enters constant current mode, the output power can be programmed to 18W by one resistor, and the constant power control makes it easy to meet QC30 power requirements.
At the same time, Nanxin Technology SC8103 adopts programmable frequency setting and working mode selection, with a minimum of external components; It also supports complete protection, including input under-voltage protection, output over-voltage protection, short-circuit protection and auto-restart, and over-temperature protection.
Nanxin Technology SC8103 Facts.
Close-up of the SC8103 synchronous buck converter for the other output.
The filtered solid capacitors are from PolyCap and are RN series miniaturized solid capacitors with a specification of 82 F 25V. The capacitor jacket is covered with a plastic insulating sleeve to enhance the insulation performance.
According to the dismantling of the charging head network, Berry's products are widely used in chargers, car chargers, wireless charging, mobile power supplies, energy storage power supplies and other fields, and have been used by many products of well-known brands such as OPPO, vivo, Xiaomi, Honor, Samsung, Huawei, Lenovo, Zimi, Nubia, Bull, Anker, etc., and the products have been highly recognized by the market.
The other filtered solid-state capacitor has the same specifications.
The step-down inductor is magnetically surrounded, and the bottom is insulated with a bakelite board.
Close-up of insulated bakelite board at the bottom of the inductor.
The output VBUS switch is from Weizhao Semiconductor, model VS3618BE, NMOS, withstand voltage 30V, and conduction resistance is 52M in a PDFN3333 package.
Weizhao VS3618BE details.
Through the dismantling of the charging head network, the products using Weizhao VS3618BE also include Nubia 20W PD fast charging charger, Xiaomi 11 original 55W gallium nitride charger, Huntkey 55W USB PD fast charging charger, Xiaomi 33W PD fast charging, Xiaomi mobile phone original 30W fast charging, etc., and the product performance of Weizhao MOS has also been recognized by many well-known brands.
The other VBUS switch is of the same type.
The USB-C receptacle is fixed by via soldering, and the blue rubber core does not expose copper.
A list of all dismantling and a family photo.
This 35W gallium nitride charger of Huntkey adopts a cube-shaped design, a white body, and a compact size. The charger has two USB-C outputs, supports 35W output power, and has a 20V output. The two USB-C ports support power blind plugging, support UFCS fusion fast charging and PPS fast charging, and have good compatibility with laptop and mobile phone fast charging.
Through the dismantling of the charging head network, it was learned that the internal potting process of Huntkey's charger was adopted to improve the heat dissipation performance and weather resistance of the charger. The charger is composed of two PCBs and planar transformers for welding, using a flyback switching power supply design, and using a gallium nitride encapsulated chip and synchronous rectification to form a switching power supply with a fixed voltage output.
The output secondary step-down circuit is composed of Yingjixin IP2738U dual-port protocol chip and two Nanxin Technology SC8103 synchronous step-down converters, and the bottom of the step-down inductor is equipped with a bakelite board to strengthen the insulation. The output filter capacitor is from Berry, and the VBUS switch is from Weizhao Semiconductor. The internal structure of the charger is compact, and the workmanship and materials are solid and reliable.