Preface
The charging head network got a 35W gallium nitride magnetic absorption nano fast charger launched by Yoshengshi, this charger is different from the traditional charger is equipped with a magnetic telescopic USB-C cable module, which can be installed as a self-contained cable charger, and the module can be removed as an ordinary charger. It also comes with folding pins for easy portability.
This charger supports 35W fast charging, the body interface and magnetic USB-C cable both support 35W output, and the power is automatically distributed when the dual ports are used at the same time, which is evenly divided into 17.5W+17.5W, which can meet the fast charging needs of two devices at the same time. The following brings the disassembly of the gallium nitride magnetic charger of Yoshengshi, and let's take a look at the internal scheme and design.
Appearance of the Yosen 35W GaN charger
USAMS's 35W GaN charger is designed in a square column shape, with black and white shells on the upper and lower parts, and the surface of the fuselage is matte and the corners are rounded.
One of the design highlights of the product is that it comes with a retractable USB-C cable, which ensures that the product is portable as a whole and allows users to carry less cables and reduce the user's travel burden.
The black and white part of the fuselage split design is another highlight of the charger, between the contact contact power, the concave and convex part design can avoid the two parts of the fuselage splicing is easy to misplace.
The split design allows users to travel with only one device and only the white body part, which further reduces the burden of take-out and improves the playability of this product.
The white body is powered by five metal ejector pins.
The black body is powered by five gold contacts.
The charger has the USAMS brand printed on one side of the body.
The words 35W GaN are printed on the other side, indicating that this is a 35W GaN charger.
There is also a USB-C port on the same side as the USB-C cable.
The bottom shell of the fuselage is printed with the detailed parameter information of the charger.
Close-up of charger parameters
型号:US-CC205/US-CC212
输入:100-240V~50/60Hz 2A (Max)
Output:
USB-C1线/USB-C2：5V3A、9V3A、12V2.9A、15V2.33A、20V1.75A
PPS：3.3-11V3A
USB-C1线+USB-C2：17.5W+17.5W
Manufacturer: Shenzhen Youshengshi Trading Co., Ltd
The product has passed CCC certification.
The charger is equipped with foldable GB prongs.
The measured height of the charger is 51.71mm.
The width is 50.64mm.
The thickness is 50.67mm.
In addition, the length of the USB-C cable is about 83cm.
Compared with Apple's 35W charger, the height and thickness of the body of Yoshengshi are a little smaller, and the width is larger.
Feel the size of the charger in your hand.
In addition, the net weight of the charger is measured to be about 130g.
The USB-C1 cable output is measured with ChargerLAB POWER-Z KM003C, which supports FCP, SCP, AFC, QC3+, PD3.0, PPS, DCP, and Apple 2.4A charging protocols.
此外还具备5V3A、9V3A、12V2.91A、15V2.33A、20V1.75A五组固定电压档位，以及3.3-11V3A一组PPS电压档位。
It is measured that the USB-C2 port supports the same protocol.
In addition, PDO packets are the same, that is, the output performance of the USB-C1 cable and the USB-C2 port is the same, and it can be used in blind plugging.
Maxim 35W GaN charger disassembled
After reading the unboxing and testing of this gallium nitride charger from Yoshengshi, let's disassemble it and take a look at the internal design and materials.
Firstly, the charger shell is pried open along the seam of the shell, and the internal PCBA module adopts the potting process, and four circular magnets are provided inside the cover plate for adsorbing the telescopic line module.
The PCBA module is powered by wire welding.
The red and black wires are soldered to the PCBA module.
The PCBA module consists of three PCB soldering, the internal space is welded with high-voltage filter capacitors and transformers and step-down inductors, and Mylar sheet insulation is used between the primary stages.
The length of the PCBA module is about 43.9mm measured by vernier calipers.
The width of the PCBA module is about 44.6mm.
The thickness of the PCBA module is about 18mm.
Front view of PCBA module, upper left soldered fuse, NTC thermistor, common mode inductor. The middle is welded with a high-voltage filter capacitor, the right side is welded with a step-down inductor and an output step-down plate, and the bottom plate is welded with a transformer.
The back of the PCBA module is soldered with SMD Y capacitor and feedback optocoupler, and the bottom is soldered with a rectifier bridge.
The small board on the side of the PCBA is welded with the GaN main control chip and the synchronous rectifier chip.
Output small board soldered filtered solid capacitor and USB-C receptacle.
Soldering split three PCBA modules.
Through the observation of the PCBA module, it is found that the 35W gallium nitride charger of Yoshengshi uses Huayuan gallium nitride encapsulated chip and synchronous rectifier chip to form a switching power supply with fixed voltage output. The output adopts two independent synchronous step-down circuits to realize the fast charging output of two USB-C interfaces. Let's start with the input to understand the design and materials of this charger.
List of PCBA module inputs, solder fuse on the right, NTC thermistor and common-mode inductor.
The fuse is from Huade Electronics and is 3.15A 250V.
NTC thermistor silkscreen 5D-7 for suppressing inrush current at power-up.
The common mode inductor is wound with enameled wire and insulated wire, and the bottom is welded with an insulating bracket.
Close-up of SMD rectifier bridge, model LSR50M, specification 5A 1000V, from ZOWIE Zhiwei.
The high-voltage filter capacitor comes from Aihua.
The specification is 400V 22μF, and the total capacity of the three pieces is 66μF.
The differential mode inductor is wound with an I-shaped core and insulated by a heat-shrinkable tube.
Weld transformers, SMD Y capacitors, and filtered solid capacitors on small side boards.
On the other side, the GaN main control chip and the synchronous rectifier chip are welded.
The GaN encapsulated chip is from Huayuan Zhixin, model HYC3606, the chip integrates a 650V 365mΩ enhanced GaN switch tube, a digital multi-mode flyback controller and an adaptive GaN gate driver, which eliminates the interference of parasitic parameters on high-frequency switching by encapsulation.
Huayuan Zhixin HYC3606 adopts secondary side feedback to meet the wide voltage range output required for fast charging. The chip supports static GND heat dissipation, and has built-in rich protection functions, including LPS, VCC power supply overvoltage protection, transformer magnetic saturation protection, overheat protection, overload protection, and output overvoltage protection.
Huayuan Zhixin HYC3606 Profile information.
The transformer is made of ATQ18 magnetic core, which is tightly wound with tape insulation.
The secondary synchronous rectification adopts the synchronous rectifier chip HYC9012 Huayuan Zhixin, which combines the synchronous rectification MOS and the synchronous rectification controller in one package, and has a built-in synchronous rectifier tube with a withstand voltage of 100V and a conduction resistance of 9mΩ. The chip supports DCM, CCM, PFM and QR multiple working modes, the supply voltage range is 3-25V, with adaptive pre-shutdown drive to speed up shutdown transition, support optional minimum shutdown time, drive pull-down at startup, 10nS shutdown delay and other functions.
Huayuan Zhixin HYC9012 Profile.
The output filter capacitor specification is 470μF 25V.
SMD Y capacitors come from Sichuan Teruixiang Technology Co., Ltd., which have the characteristics of small size and light weight, which are very suitable for high-density power products such as gallium nitride fast charging. The part number is TMY1471K.
Teruixiang focuses on the research and development, production and sales of passive components, with a registered capital of 100 million yuan. It has two categories of independent capacitor brands: SMD TRX and DIP TY capacitors, TRX will be committed to the research of ceramic materials, in order to expand more categories of applications, to provide customers with more solutions.
The charging head network learned that in addition to being used by dozens of high-power chargers such as Baseus Qualcomm QC5 certified 100W gallium nitride fast charging, Maiduoduo 100W gallium nitride, OPPO 65W super flash charging gallium nitride charger, Lenovo 90W gallium nitride fast charging, Nubia 65W gallium nitride charger, Baseus 120W gallium nitride + silicon carbide PD fast charging charger, etc., can also be applied to 20W mini fast charging of brands such as Hailutong, First Guard, Belkin, etc., and the performance has been unanimously recognized by customers.
The other SMD Y capacitor has a TMY1101K part number.
The HK1018 optocoupler is used for output voltage feedback.
The output buck board is soldered with a USB-C receptacle and an output filter capacitor on the front.
Two buck conversion chips are soldered on the back, and the buck magnetic ring inductor and output filter capacitor are welded on the back.
The buck conversion chip is from Huayuan Zhixin, model HY5331, is a synchronous step-down converter integrated with USB-C protocol, the chip supports 5.1-29V input voltage, and the switching frequency can be programmed by an external resistor, with a range of 100-500kHz. A low-impedance MOS transistor is integrated into the chip, which supports the use of a 5mΩ current sampling resistor.
Huayuan Zhixin HY5331 supports input over-voltage protection, under-voltage lockout, output over-current protection, output short-circuit protection, interface over-voltage protection and over-thermal shutdown. The chip has built-in line loss compensation, supports constant voltage and constant current control, and the chip supports a comprehensive fast charging protocol, and can adjust the output PDOs according to the input voltage, which is suitable for fast charging chargers and car chargers.
Huayuan Zhixin HY5331 information.
The other buck chip is of the same model.
Close-up of two step-down inductors, with barley paper pasted on the bottom and insulated by heat shrinkable tubes.
The output filter capacitor specification is 150μF 25V.
The USB-C receptacle is fixed by via soldering, and the black rubber core does not expose copper.
The other filter capacitor is 150μF 25V.
Next, disassemble the retractable USB-C cable module, first pry open the casing fixed by the buckle, and inside is the clockwork mechanism and magnet.
The inside of the cover is equipped with grooves to hold the magnet and the mainspring.
The upper right corner of the upper PCB is soldered with a contact point.
Remove the slip ring PCB on the upper layer.
There are gold-plated contacts on the back of the PCB for connecting to the charger.
The back side is a conductive slip ring, which supplies power to the telescopic wire.
Both the telescopic wires and brushes are soldered to the round PCB.
The disc PCB is screwed to a white spool.
Unscrew the set screws and remove the internal winding mechanism.
Two sets of brushes are soldered on the disc PCB.
The telescopic wire is soldered to the disc PCB.
The inside of the housing is provided with a spool locking mechanism.
Close-up of the telescopic locking mechanism of the cable for spool rotation.
Close-up of the magnet inside the housing for adsorbing the USB-C plug.
A list of all dismantling and a family photo.
Summary of the dismantling of the charging head network
This GaN charger adopts a novel magnetic design, in which the charger and the retractable USB-C cable are split design, which can be used as a charger with its own USB-C, or the magnetic USB-C cable module can be removed and used as a charger. The USB-C cable that comes with the charger is 80CM in length, which meets the needs of daily use. The output power of the charger is 35W, and it supports automatic power distribution of dual ports to meet the fast charging needs of mobile phones and laptops.
Through the dismantling of the charging head network, it was learned that the charger was soldered by a combination of three PCBs to make full use of the space and reduce the volume. The switching power supply adopts Huayuan Zhixin HYC3606 encapsulated gallium nitride chip + HYC9012 synchronous rectifier chip, and the output adopts two HY5331 synchronous step-down chips to achieve fast charging output, and HY5331 integrates protocol functions and synchronous step-down converters and switches, and the fast charging protocol supports comprehensively. The overall solution has the advantages of high integration, high conversion efficiency and simplified peripheral components.
Huayuan Zhixin is deeply engaged in power management, digital power supply and household appliance power management and other application fields, and is committed to providing customers with high-performance, high-quality, customized industrial and consumer electronics solutions, and building a comprehensive power management solution provider from AC to DC integration with high efficiency, wisdom and energy saving.