Preface
MCDUODUO has launched a 4-in-1 GaN fast charging socket, which has a UK-spec jack and 3 USB ports of 2C1A, which can meet the needs of extended power extension and fast charging of mobile phones and laptops. The socket is a long structure, with a British three-pin socket on the front and a 2C1A fast charging interface on the side.
The socket is equipped with a 1.5 m long power cord and a fuse inside the UK plug for overcurrent protection. There is also a surge protection circuit inside the socket, and an indicator light on the side is used to indicate the surge protection function. The following charging head network will bring the dismantling of the 4-in-1 gallium nitride fast charging socket of Maiduoduo, and take a look at the internal design and materials.
McDuoduo 4-in-1 70W GaN fast charging socket unboxing
The box continues the same design as the 70W 2A2C 6-in-1 GaN fast charging socket CH-459, and the front is printed with the Mcdodo brand, product appearance, English name and selling point logo.
The back is printed with product application scenarios, detailed product parameters, business information, etc.
Close-up of the parameters on the packaging box, and then introduce it in detail to the physical display of the product.
The package contains a 70W 4-in-1 GaN fast charging socket, instruction manual and warranty card. The plug pins of the product are protected by a plastic shell, and the plastic film of the outer body is scratch-resistant.
The 70W 4-in-1 gallium nitride fast charging socket also comes with a British-sized pin power cord, and the fuselage is also a rectangular shape, but the longitudinal design adopted can be said to have many matching elements, but it also has its own characteristics.
The surface of the power cord plug is frosted to facilitate user plugging and unplugging, and the top surface is designed with the word FUSED.
The pins are British-spec and have a fuse on the inside side, so that the power cord and the socket itself will not be damaged in the event of an accident, so the loss can be minimized.
The fuse is rated at 13A.
The connection between the power cord and the socket body is equipped with a rubber sleeve to strengthen the protection.
The body of the socket is made of PC fireproof material shell, and the surface of the body is matte and anti-fingerprint. The longitudinal design of the fuselage makes it more suitable for use in some narrow corners, and can better meet the needs of characteristic scenes and people.
The top surface of the fuselage is equipped with a British three-hole socket, and the area is designed with two wings to make the plug access more stable.
AC Output: 2200W Max is printed next to the socket, indicating that it can carry the maximum power and prompting the user to use it.
顶面靠近前端区域印有70W GaN字样。
On one side of the fuselage, the Mcdodo brand is printed and equipped with a surge protection indicator.
Under normal power-on, the indicator light is light blue, and SURGE PROTCTION is printed next to the lamp.
The output shell is treated with high gloss and bright surface, and is equipped with three USB interfaces of indicator light and 2C1A, all of which are made of orange rubber core.
There are anti-slip pads at the bottom four ends of the fuselage to ensure the smooth use of the socket, and the bottom shell is printed with product parameter information.
Close-up of product parameters
Model: CH-466
输入:250V~50/60Hz,2200W Max
AC输出：250V~2200W Max
Output:
USB-C1:5V3A、9V3A、12V3A、15V3A、20V3.5A
PPS：3.3V-11V4.05A 70W Max
USB-C2:5V3A、9V3A、12V3A、15V3A、20V3.5A
PPS：3.3V-11V4.05A 70W Max
USB-a:5v3a、9v3a、12v2.5a、20v1.5a 30v max
The products have passed CE and UKCA certification.
The total length of the power cord and socket is about 152cm.
In addition, the length of the socket body is measured to be 115.18mm.
The width is 55.18mm.
The thickness is 31.25mm.
The size of the product in the hand is intuitively felt.
In addition, the measured weight is about 374g.
Under normal power-on, the indicator light will light up blue.
The USB-C1 port is measured by using the ChargerLAB POWER-Z KM003C to support FCP, SCP, AFC, QC3.0/4+, PD3.0, PPS, DCP, and Apple 2.4A charging protocols.
PDOs报文显示USB-C1口还具备5v3a、9v3a、12v3a、15v3a、20v3.5a五组固定电压档位,以及3.3-11v4.05a一组PPS电压档位.
It is measured that the USB-C2 port is compatible with the same protocol as the USB-C1 port.
In addition, PDO packets are the same, that is, the output performance of the two USB-C ports is exactly the same, and the power is supported for blind mating.
Finally, it was measured that the USB-A port supports FCP, SCP, AFC, QC3.0, DCP, and Apple 2.4A charging protocols.
Maiduoduo 4-in-1 70W GaN fast charging socket dismantling
After reading the unboxing and testing of the gallium nitride fast charging socket of McDuoduo, let's disassemble it and take a look at the internal design and materials.
First, remove the non-slip rubber pad on the bottom of the socket and set the screws on the inside.
Unscrew the set screws and remove the back cover of the receptacle. Inside the socket is the socket module and the fast charging module, and the partition structure is adopted inside the shell.
The power inlet and socket modules are secured by screws.
Unscrew the set screws and proceed with the disassembly.
Remove the socket module and PCBA module from the inside of the socket housing.
The fast charging module is connected to the socket module by wire welding.
Soldering to disconnect the fast charging module from the socket module.
Soldering to remove the connection of the power cord from the socket module.
Close-up of the light guide plastic of the surge protection indicator light of the socket module.
Close-up of wire fixing sleeve.
The socket module is soldered with an orange socket on the front, a varistor and a thermal fuse for surge protection are soldered on the upper left, and an indicator light is soldered on the bottom.
The back is soldered with a copper sheet of the socket.
The varistor is from Taiqiang, with a specification of 14D681K, and is used for surge overvoltage protection.
The thermal fuse comes from Celte, fits snugly to the varistor and is used for varistor overtemperature protection.
Close-up of the surge function working indicator.
Close-up of the current-limiting resistor and diode used for the indicator.
The orange socket cover is disassembled, and the copper strip is integrated inside, and the safety door and return spring are close-up.
The PCBA module is wrapped with a brass heat sink and fixed with wrapping tape.
The heat sink is soldered to the back of the PCBA module for fixation.
The AC input wires are connected by soldering.
Solder a small vertical board at the output end, and solder the filter capacitor and the USB receptacle.
The length of the PCBA module measured by vernier calipers is about 51.1mm.
The width of the PCBA module is about 49.1mm.
The thickness of the PCBA module is about 25mm.
The weight of the PCBA module is measured to be about 106g.
The brass heat sink wrapped in the PCBA module is soldered and removed, and the inside is glued and equipped with a thermal pad to strengthen heat dissipation.
Close-up of a brass heat sink.
Mylar sheet insulation is provided between the output board and the primary side element.
The front of the PCBA module is at a glance, with a welded fuse in the upper left corner, common mode inductance, safety X2 capacitor, high voltage filter capacitor and differential mode inductor. The transformer is welded underneath, and the step-down output plate is welded on the right.
The back of the PCBA module is welded with a rectifier bridge, a gallium nitride main control chip, a gallium nitride switch tube, two SMD Y capacitors and a feedback optocoupler, and a synchronous rectifier controller and a synchronous rectifier tube.
Solder the step-down plate, and weld two magnetic ring inductors on the back of the step-down board.
Through the observation of the PCBA module, it is found that the gallium nitride fast charging socket adopts a QR flyback architecture, synchronous rectification, and the fixed voltage output is powered by the step-down output board. The step-down board realizes the fast charging output of two USB-C ports and USB-A ports through two independent synchronous step-down circuits. Let's start with the input to understand the information of each device.
PCBA module input at a glance, soldered fuse, common mode inductor, safety X2 capacitor and high-voltage filter capacitor, right side soldered transformer and a small capacitor.
The input fuse is from Better Electronics, the discharge number is 932, and the specification is 3.15A 250V.
Side view of PCBA module, common mode inductance, safety X2 capacitor, high-voltage filter capacitor and differential mode inductor close-up.
Common mode inductors are wound with enameled and insulated wires.
The safety X2 capacitor is from Tiannatai and has a specification of 0.33μF.
The rectifier bridge is from Jingheng, the model is RUBF810, and the specification is 8A1000V.
The high-voltage filter capacitor comes from Yuguang Electronics, with a specification of 39μF 400V and a total capacity of 117μF.
Differential mode inductor jacket heat shrink tube insulation.
The main control chip adopts the MK2697A of Maoruixin, which is a QR PWM controller optimized for PD/fast charging applications. Its wide VCC operating voltage range (9V-90V) allows it to cover the PD/PPS output range from 3.3V to 23V without the need for additional windings or linear step-down circuitry.
MK2697 is designed for energy efficiency requirements, and adopts adaptive multi-mode due to the multiple output voltages of PD/fast charging. It is adjusted to work in DCM/QR under different loads and different outputs. At light loads, it will work in burst mode to improve efficiency.
MK2697A provides comprehensive protection functions, including output OVP, OPP, VCC OVP, BROWN-IN/OUT, secondary SR short circuit protection, PIN pin OPEN/SHORT protection, etc.
Morrex MK2697A Profile Information.
According to the dismantling of the charging head network, the fast charging solution of Maorui Xin is also used in Huakesheng mini 33W fast charging, Baseus 20W 1A1C fast charging charger, ISA Watt 65W 2A1C gallium nitride fast charging, air-J 18W 1A1C fast charging charger and other products.
The GaN switch is from Innoscience, model INN700DA190B, is an enhanced GaN switch with a withstand voltage of 700V, with a conduction resistance of 190mΩ, and a DFN5*6 package.
The electrolytic capacitors that power the main control chip come from Yuguang.
The specification is 4.7μF 50V.
The transformer core is tightly wound and insulated with adhesive tape, and the secondary is wound with multi-layer insulated wire.
The two SMD Y capacitors are 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 TMY1102M.
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.
Zhaolong CT1019 optocoupler is used for output voltage feedback.
The synchronous rectifier tube is from Shanghai Belling, model BLP065N10GL, NMOS, withstand voltage 100V, conduction resistance 6mΩ.
Two filter solid-state capacitors and an output step-down plate are welded to the output.
The two filter capacitors are 560 μF 25 V and 470 μF 25 V, respectively.
The front of the buck board is welded with USB-C receptacle, USB-A receptacle, synchronous buck switch and two filter capacitors.
The back side is soldered with a protocol chip, a VBUS switch and two magnetic ring inductors.
Remove the magnetic ring inductor, and solder two synchronous step-down controllers, protocol chips and corresponding VBUS switch tubes under the inductor.
The USB-C1 port protocol chip adopts Yingjixin IP2723T, which has passed the USB IF Association PD3.0 PPS certification, TID: 3135, which is a fast charging protocol IC that integrates multiple protocols and is used for USB output ports. Supports multiple fast charging protocols, including USB TypeC DFP, PD2.0/3.0, PPS, HVDCP QC4, QC4+, QC3.0/2.0, FCP, SCP, AFC, MTK PE+ 2.0/1.1, Apple 2.4A, BC1.2, and Samsung 2.0A. On the right is the TVS protection tube of the USB-C female socket, which is used for the electrostatic protection function.
IT CAN PROVIDE A COMPLETE TYPE-C SOLUTION FOR UNIDIRECTIONAL OUTPUT APPLICATIONS SUCH AS ADAPTERS AND CAR CHARGERS. In addition IP2723T it has a high level of integration and rich functions, and only requires very few peripheral components in the application, effectively reducing the size of the overall solution and reducing the BOM cost.
Yingjixin IP2723T information.
The charging head network dismantled and learned that Yingjixin IP2723T has been used by many brands such as Flashmo, Momis, REMAX, Maiduoduo, Huakelong, etc., and has also been used by Momax 65W 2C1A gallium nitride fast charging charger, Nubia 65W USB PD GaN charger, Nubia 1A1C 45W deuterium front gallium nitride fast charger and other gallium nitride chargers. More than 100 products from well-known brands such as Beijing Manufacturing, Huawei, Samsung, and Tesla have been adopted.
USB-C2 and USB-A port protocol chips are from Yingjixin, model IP2726, which is a very widely used protocol chip. Yingjixin IP2726 is a fast charging IC that integrates multiple protocols for USB output port, supporting Type-C DFP, PD2.0/3.0, PPS, QC4+, QC2.0/3.0, FCP, AFC, SCP, MTK PE+, Apple2.4A, BC1.2 and Samsung 2A protocols. With high integration and rich functions, only a few peripheral components are required for application, effectively reducing the size of the overall solution and reducing the BOM cost.
The charging head network learned that Yingjixin IP2726 has previously been used by AUKEY 65W 1A1C GaN fast charging charger, RAVPOWER 90W dual USB-C port PD fast charging charger, Steck 100W dual USB-C port gallium nitride charger, Maiduoduo 30W 1A1C USB PD fast charging charger, Kunxing 18W USB PD3.0 PPS fast charging charger and other products.
The synchronous rectification buck controller for the step-down output is from Yingjixin, the model is IP6550, which is a synchronous step-down controller that supports 36V input, with a built-in NMOS tube drive and two external MOS transistors for efficient synchronous rectification and step-down. The IP6550 regulates the output voltage via the feedback pin. The switching frequency is 135KHz, the input terminal withstand voltage is 48V, and the built-in perfect protection function is complete. Yingjixin IP6550 adopts a 3*3mm QFN16 package, which can realize the simplified synchronous step-down conversion circuit design.
The IP6550 can be used in car chargers, multi-port adapters, smart sockets, USB-C socket strips, and dashcam applications. The synchronous rectification step-down has high conversion efficiency, high output current can be used for multi-port 5V output, and can be used with PD protocol chip to achieve a wide range of voltage regulation, which meets the application of USB PD3.1.
Yingjixin IP6550 data information.
Four MOS transistors are used for synchronous step-down, Ruijun Semiconductor RUH4040, NMOS, withstand voltage 40V, conduction resistance 8mΩ, in PDFN3333 package.
The two output filter capacitors are from Fengbin, which are PT series 125°C heat-resistant solid-state capacitors with a specification of 180μF 25V.
The VBUS switch for the USB-C1 interface is RUH4040 by Ruijun Semiconductor.
The VBUS switch for the USB-C2 and USB-A interfaces is a 30V dual NMOS with a DFN3030 WTM403N095LS resistance and a package.
The USB-C receptacle is soldered through the hole, and the orange tongue does not show copper.
The USB-A receptacle also uses an orange rubber core, and the positive and negative poles are widened to support high-current fast charging.
Close-up of the LED power indicator.
A list of all dismantling and a family photo.
Summary of the dismantling of the charging head network
The MEDUODUO 4-in-1 GaN fast charging socket comes with a 1.5-meter long power cord, a UK-spec jack and three USB fast charging ports in 2C1A, for a total of four fast charging ports. The socket is equipped with a surge protection circuit for lightning strike protection. The USB-C interface supports 70W fast charging, the USB-A interface supports 30W fast charging, and supports automatic power allocation, which can meet the needs of laptops and mobile phones for fast charging at the same time.
Through the dismantling of the charging head network, it was learned that the inside of the McDuoduo 4-in-1 GaN fast charging socket is a separate design of the socket module and the fast charging module, and the shell adopts a partition structure and is connected by wire welding. The socket module is equipped with a safety door to prevent foreign objects from entering and a varistor for surge protection.
The fast charging module adopts the main control chip of the Maorui MK2697A with the GaN switch of Innoscience INN700DA190B the synchronous rectifier tube adopts the Shanghai Belling BLP065N10GL, the protocol chip adopts the Yingjixin IP2723T and IP2726 protocol chip, and the IP6550 synchronous step-down controller. The internal electrolytic capacitor of the fast charging PCBA module comes from Yuguang Electronics, and the output is filtered by Fengbin solid-state capacitor, and the PCBA module is equipped with a thermal pad, wrapped with a brass heat sink, and the internal materials are solid and reliable.