Miwu, a brand under the Xiaomi ecosystem, has launched a Zhenmiao 65W gallium nitride charger, available in both red and green colors. It is equipped with a 2C1A interface, and both C ports support 65W fast charging, allowing for blind plug use. When used simultaneously, it supports 45W+20W dual-port fast charging, which can meet the power demand of MacBook and iPhone 12 at the same time. The USB-A port supports up to 30W fast charging and also supports Huawei 22.5W SCP fast charging. Today, I'll share with you the disassembly of this charger and take a look at the materials used in its internal design.

I. Appearance of Miwu Zhenmiao 65W Gallium Nitride Charger

This charger adopts a long columnar design. The body shell is divided into two parts, each sprayed with green gold paint, which feels smooth to the touch. The transition between each surface of the waist is smooth and rounded.

The words "65W GaN" are printed in golden font on the body.

The parameters of the charger are printed on the input terminal shell

Product Name: Miwu Zhenmiao Gallium Nitride Fast Charger

Model: ZPQ651CN-3

Input: 100-240V~50/60HZ 1.5A

Single-port output

    USB-C1/C2:3.3-11V3A, 5V3A, 9V3A, 12V3A, 15V3A, 20V3.25A

    USB-A: 4.5V5A, 5V4.5A, 9V3A, 12V2.5A, 20V1.5A

Dual-port output

    C1+C2:45W+20W (Maximum 65W)

    C1+A: 45W+18W (Maximum 63W)

    C2+A: 5V3A

Three-port output

    C1+ (C2+A) : 45W+5V3A

Manufacturer: Zhaowen Electronics (Shenzhen) Co., LTD

Supervised by: Beijing Miwu Technology Co., LTD

The product has passed the 3C certification.

It adopts foldable national standard pins, which are convenient to carry and will not scratch other devices in the bag.

The top surface of the output is equipped with three output interfaces 2C1A. The two C ports have black rubber cores without exposed copper, and the USB-A port has a green rubber core.

The measured length of the charger body using a vernier caliper is 65.84mm.

The width is 30mm.

The thickness is 34.08mm. The volume of the charger can be calculated as 67.31cm³ through three-dimensional means. Therefore, the power density is approximately 0.97W/cm³, making it the best among multi-port gallium nitride chargers.

Compared with the 61W charger of Apple, its size advantage is very obvious.

The intuitive feeling when held in hand.

The net weight is approximately 101g.

The output protocol of the USB-A port was tested using ChargerLAB POWER-Z KT002, showing support for Apple 2.4A, Samsung 5V2A, DCP protocol, as well as multiple fast charging protocols such as QC2.0/3.0, AFC, FCP, SCP, and PE2.0.

Use KT002 to test the output protocol of the USB-C1 port. Compared with the A port, it also supports additional PD3.0 and PPS fast charging protocols.

In addition, the USB-C1 port also has five fixed voltage ranges: 5V3A, 9V3A, 12V3A, 15V3A, and 20V3.25A, as well as one PPS voltage range from 3.3 to 11V3A.

Using KT002 for detection, it was found that the output protocol of the USB-C2 port was exactly the same as that of the C1 port.

The PDO message is the same, so the single-port output performance of these two C ports is the same, supporting power blind insertion, which is very convenient for daily use.

II. Disassembly of Miwu Zhenmiao 65W Gallium Nitride Charger

Disassemble the input terminal housing, and connect the pins and the PCB board through AC wires to supply power.

The input end of the charger is equipped with a small board. There are heat sinks on the top and sides to assist in heat dissipation. The high-voltage side is wrapped with insulating tape.

There are three small boards at the output end. The back of the small board where the USB-C1 female socket is located is attached with a thermal pad.

A comprehensive view of the front of the motherboard, with capacitors, transformers, etc. reinforced with glue.

A view of the back of the motherboard: An optocoupler and two surface mount Y capacitors span between the primary and secondary sides. The primary side is equipped with a white fuse, a main control chip, and gallium nitride power switch tubes. The secondary side is equipped with a synchronous rectifier controller and rectifier tubes.

After observing the charger circuit, it was found that this gallium nitride charger adopts the currently popular switching power supply constant voltage output, with a two-channel independent step-down three-port output architecture. Among them, the USB-C1 port is a separate one, and the other 1A and 1C ports are one. The output power of the three ports is intelligently distributed. Now let's delve into the entire circuit design situation starting from the input end.

Input terminal overview: In addition to the small board, there are also four high-voltage filter electrolytic capacitors.

When the small board is removed, there is a common mode inductor on the front.

There is a rectifier bridge on the back.

Close-up of surface mount fuse, rated current 5A.

The safety X capacitor is from Dongguan Chengxi Electronics Co., LTD.

Dual-wire winding of common mode inductors is used to filter out EMI interference.

Close-up of the FMSB4M rectifier bridge at the input end.

All four high-voltage filter electrolytic capacitors are from Guangdong Sapphire Industry Co., LTD., among which three have a specification of 400V 22μF.

One piece has a specification of 400V 33μF.

Close-up of the E-shaped inductor.

A side view of the PCB board shows that a transformer is placed in the middle, and the solid-state capacitor on the left side of the transformer is used for synchronous rectification output filtering.

The main control chip of the charger is ON Semiconductor NCP1342, which is a highly integrated high-frequency quasi-resonant flyback PWM controller with built-in active X2 capacitor discharge and multiple comprehensive protection functions, featuring extremely low standby power consumption.

Charging Head Network has learned through disassembly that Other products that adopt the ON Semiconductor NCP1342 main control chip include the Busus 65W 2C gallium nitride fast charger, the Xinmao Micro 65W 2C1A gallium nitride fast charger, the Xiaomi 55W gallium nitride charger, the ASUS 65W gallium nitride charger, the new OPPO 65W Super Flash Charge gallium nitride charger, and the OnePlus 65W Warp Flash Charger, Nuts 65W single C port gallium nitride charger, Lenovo thinkplus 65W Gallium nitride Lipstick Power Supply Pro, Xiaomi 120W Super Fast Charger, iQOO 120W Flash Charger, etc.

The charger adopts the Navitas NV6115 GaN power device, which is the core component of the charger. The NV6115 features an integrated driver and complex logic control circuits, with a 170mΩ on-resistance and a withstand voltage of 650V. It supports a 2MHz switching frequency and adopts a 5*6mm QFN package, saving space. Thanks to the built-in driver of the NV6115, there is no need for an external driver, which further saves PCB space.

Detailed information of Nanomicro NV6115.

Charging Head Network Disassembly and understanding: The ASUS 2C1A 65W gallium nitride charger, Nubia 65W Deuterium Peak three-port gallium nitride fast charger, Rapoo 65W GaN fast charger, Xiaomi Type-C 65W GaN charger, OPPO 50W Cookie gallium nitride fast Charger, and RAVPOWER 65W also adopt the NV6115 from Nanomicro Semiconductor Products such as 1A1C gallium nitride fast charging charger, Belkin 68W dual C port GaN charger, Momis 65W 2C1A gallium nitride fast charging charger, and Youbi 30W 1A1C gallium nitride fast charging charger.

The transformer is wrapped with insulating tape and has an information label attached to the top.

Everlight EL1019 optocoupler is used for primary and secondary communication and feedback output voltage.

The two surface mount Y capacitors on the side are from Sichuan Terui Xiang Technology Co., LTD. They feature small size and light weight, making them highly suitable for application in high-density power supply products such as gallium nitride fast charging.

Trelight is dedicated to the research and development, production and sales of passive components, with a registered capital of 100 million yuan. It has two self-owned capacitor brands: SMD TRX and DIP TY capacitors. TRX will be committed to the research of ceramic materials to expand the application of more categories and provide more solutions for customers.

Charging Head Network has learned that in addition to being used in dozens of high-power chargers such as the 100W gallium nitride from Meiduoduo, the 65W Super Flash Charge gallium nitride charger from OPPO, the 90W gallium nitride fast charger from Lenovo, the 65W gallium nitride charger from Nubia, and the 120W gallium nitride + silicon carbide PD fast charger from Beix It is also applied to 20W mini fast charging devices of brands such as Hailutong, First Guard, and Belkin, and its performance has been unanimously recognized by customers.

Silk-screened IBHJM secondary synchronous rectifier controller, actual model MP6908A, from MPS Core Source Semiconductor, with a maximum operating frequency of 600KHz, supports DCM, CCM, QR and ACF operating modes, and supports synchronous rectifier tubes driven by standard voltage and logic voltage.

Detailed specification parameters of MPS MP6908A.

Charging Head Network Disassembly and understanding: Also adopting MPS MP6908A are Nubia 65W Deuterium Peak Gallium nitride Charger Pro, Nuts 65W Single C Port Gallium Nitride Charger, Lenovo 90W Flash Charging Dual Port Gallium Nitride Charger, Dell 90W Gallium nitride Charger, Lenovo thinkplus 65W Gallium Nitride Lipstick Power Supply Pro, Philips 65W Fast Charging Socket, etc.

In addition, the MPS synchronous rectifier chip is also used in the original 45W fast charging charger of Xiaomi 9 Pro, thinkplus 45W USB PD charger, thinkplus 65W Lipstick USB PD charger, ZMI 65W 2C1A desktop PD fast charging charger, and the original 45W USB of Google Pixelbook Dozens of products such as PD fast charging chargers have adopted it.

The synchronous rectifier tube adopts VSP008N10MSC, NMOS, with a withstand voltage of 100V, and is packaged in PDFN5x6.

Data information of Weizhao VSP008N10MSC.

The output filter solid-state capacitor is from Huarong Weiye, with a specification of 25V 680μF.

Overview of the output terminal.

Remove the small board where the C1 female socket is located. There are two DC-DC step-down circuits on the back.

There are two corresponding step-down inductors and filter capacitors on the front.

Silk-screen MCU, used for intelligent distribution of three-port output power.

Among them, the USB-C1 port has a separate circuit, and the Zhirong SW3516H main control chip is used for voltage reduction control and protocol recognition.

The Zhirong SW3516H is A highly integrated multi-fast charging protocol dual-port charging chip that supports fast charging output from either A+C port and independent current limiting for both ports. It integrates a 5A high-efficiency synchronous step-down converter. Support AFC/FCP of PPS/PD/QC / / SCP/PE/SFCP wait for a variety of quick charge agreement, maximum output PD 100 w, CC/CV mode, and the double management logic. Only a small number of peripheral components are needed to form a complete high-performance multi-fast charging protocol dual-port charging solution.

Charging Head Network found through disassembly that The SW3516H has also been adopted by multiple products such as ASUS 65W 2C1A GaN charger, Nubia 65W Deuterium Peak three-port gan fast charger, Rapoo 65W GaN fast charger, UGREEN 65W 4C port gan fast charger, Lenovo 90W Flash Charging dual-port GAN charger, and Hongdashun 120W four-port 2C2A fast charger. In addition, Zhirong's fast charging chips can also be used in fields such as USB PD fast charging power banks and fast charging car chargers.

Two MOSFETs are from Ruijun Semiconductor, model RUH4040M2, with a withstand voltage of 40V, and are used for synchronous rectification and voltage reduction output at the USB-C1 port.

Detailed information of Ruijun RUH4040M2.

Charging Head Network has learned that Products that adopt Ruijun MOS also include ASUS 65W 2C1A gallium nitride charger, Rapoo 65W GaN fast charger, UGREEN 65W 4C port gallium nitride fast charger, Hongdashun 120W four-port 2C2A fast charger, Momos 65W 2C1A gallium nitride fast charger, and Bass 45W A variety of products have adopted it, such as the 1A1C gallium nitride charger and the 120W gallium nitride + silicon carbide PD fast charging charger from Bex.

Close-up of the step-down inductor.

The step-down output filter solid-state capacitor is also from Huarong Weiye, with a specification of 25V 220μF.

Close-up of the USB-C1 female socket, via soldering.

The USB-C2 port and the USB-A port are one line. The step-down protocol chip also adopts Zhirong SW3516H, achieving single-port fast charging and dual-port 5V output.

The external MOSFET is also the Ruijun RUH4040M2.

Close-up of the step-down inductor.

The specification of another step-down filter capacitor is also 25V 220μF.

The VS3622DE from Weizhao Semiconductor features dual NMOS transistors with a withstand voltage of 30V and is packaged in PDFN3333. Here, it serves as the VBUS switch for the output of the USB-C2 and USB-A ports. On the right side, there are independent current-detecting resistors for the two output channels.

Data information of Vizhao Semiconductor VS3622DE.

Close-up of the USB-C2 female socket.

Close-up of the USB-A female socket, with widened positive and negative poles, and special contacts at the front end of the tongue plate.

Everything has been disassembled. Let's take a family photo.

Charging Head Network Disassembly summary

The Miwu Zhenmiao 65W gallium nitride charger adopts a conventional columnar design, but its body color is unique rather than the uniform black and white version. The charger is very compact overall, with a power density of 0.97W/cm³, which is quite rare among multi-port gallium nitride chargers and is convenient to carry around. In addition, the charger supports mainstream fast charging protocols such as QC, AFC, FCP, SCP, PE2.0, PD and PPS, with excellent compatibility, meeting the fast charging requirements of mobile phones and laptops from brands like Xiaomi, Huawei and Apple.

Charging Head Network has learned through disassembly that the internal components of this charger adopt a three-section layout design, which is clear and straightforward. Both the input and output terminals are equipped with small boards to make full use of the internal space. The use of surface mount fuses and Trellex Y capacitors can save space for the charger. The switching power supply of the charger is composed of ON Semiconductor NCP1342 combined with Navitas NV6115 gallium nitride power chip, and MPS MP6908A combined with Vizon synchronous rectifier MOS. Both DC-DC circuits at the output end adopt Zhirong SW3516H and Ruijun RUH4040M2, and the overall materials used are mainstream.

Source of the article: Charging Head Network