preface
In recent years, the mobile phone industry is very serious, each brand's model update iteration speed is very fast, originally many configurations that can only appear on high-end and even flagship models, are now slowly decentralized, such as the domestic Xiaomi, Redmi brand There are many models have been on 67W private fast charging.
As a member of the Xiaomi Group, Zimi has been continuously launching a variety of high-quality accessory products. Recently, the charging head network found that Zimi launched a new 67W gallium nitride fast charging product, and the original design intention of this charger is obvious from the power point of view. As for the detailed performance and workmanship materials, let's take a look with the editor.
Zimi 67W gallium nitride charger out of the box
The overall black tone of the box is printed with ZMI brand, product name, appearance diagram, Powered by CUKTECH and GaN3 logo on the front.
The back is printed with the charger to adapt to the device scenario, selling points, parameters and business information.
Close-up of packaging parameters, and then combined with the actual charger for detailed introduction.
The charger, data cable and instruction manual are included in the package.
The attached data cable is C to C line, classic white color matching, the wire end shell is matte for easy plugging and unplugging, and the mesh tail is bent resistant.
The word 6A is designed at the end of the net, indicating that this cable can pass 6A high current.
The measured length of the data cable is about 150.3cm.
Using ChargerLAB POWER-Z KM003C, the measured data line is equipped with E-Marker chip, supports 20V5A 100W PD fast charging, and the data transmission capacity is USB 2.0.
The charger adopts PC fireproof material plastic shell, the waist is sprayed with metallic silver paint, the top panel is black contrast design, and the uneven and convex treatment is done, and the overall personality is distinct.
The front of the fuselage is printed with the ZMI brand as well as Powered by CUKTECH.
The word GaN is printed on the bottom of the back, and outsiders can immediately understand that this is a gallium nitride charger.
The charger parameters are printed on the input housing
Model: A15ZM
Input: 200-240V~50Hz 1.8A
Output:
Type-C1/C2：5V3A、9V3A、11V6.1A、12V3A、15V3A、20V3.25A
USB-A:5V3A、9V2.5A、10V2.25A、12V1.87A
Dual port output:
Type-C1+Type-C2:45W+18W或18W+45W
Type-C1+USB-A:45W+18W
Type-C2+USB-A：5V3A Max
Type-C1+（Type-C2+USB-A）：45W+12W
Manufacturer: Nanjing Kuke Electronic Technology Co., Ltd
The charger is CCC certified.
The input end is equipped with foldable national standard pins, which is easy to put away and carry.
The output is equipped with 2C1A three USB ports, and the interface rubber core is black.
The height of the charger body is measured to be 54.18mm.
The width is 52.98mm.
The thickness is 27.86mm.
Compared with the size of Apple's 61W charger, the volume advantage is obvious.
The size of the charger held in the hand is intuitively felt.
In addition, the net weight of the charger is measured to be about 110g.
Using ChargerLAB POWER-Z KM003C, the USB-C1 port supports QC3.0, PD3.0, DCP, Apple 2.4A charging protocol, and Xiaomi 67W private fast charging.
And the PDO message shows that the USB-C1 interface also has five fixed voltage levels of 5V3A, 9V3A, 12V3A, 15V3A, and 20V3.25A, as well as two groups of PPS voltage levels of 5-11V6.1A (Xiaomi private) and 5-20V3.25A.
The USB-C2 port is measured to support QC3+, PD3.0, DCP charging protocol, and Xiaomi 67W private fast charging is also measured.
In addition, the USB-C2 port PDO message display is exactly the same as the USB-C1 port.
Finally, the USB-A port supports FCP, SCP, AFC, QC3+, DCP charging protocol.
Zimi 67W gallium nitride charger disassembled
Remove the top black shell to remove the PCBA module, and the housing is encapsulated by ultrasonic welding.
The PCBA module length was measured to be 48.46mm.
The width is 47.26mm.
The thickness is 22.85mm.
The PCBA module is covered with heatsinks on both sides, and insulation tape is pasted on the output of the top heatsink.
There is a Mylar tab between the bottom heat sink and the PCB board for isolation and insulation.
Remove the heatsink.
The inside of the top heat sink is pasted with graphite heat dissipation sticker, and thermal pads are attached to the two high-voltage filter electrolytic capacitors to help conduct heat.
On the front of the PCBA module, you can see the high-voltage filter electrolytic capacitor and other devices glued and reinforced, the top surface of the transformer is coated with white glue, the side board is pasted with a blue thermal pad to help conduct heat, and there is a plastic isolation board between the primary stages.
The core device on the back of the PCB board is glued to help conduct heat.
The front of the PCBA module is at a glance, in which the input EMI filter circuit and rectifier bridge are on the left, the high-voltage filter capacitor is on the right, the switching transformer is below the capacitor, and the bottom is the output step-down circuit, the soldered USB female header, the step-down inductor and the filter capacitor.
Back welded fuse, gallium nitride sealing chip, feedback optocoupler, SMD Y capacitor, synchronous rectifier controller, synchronous rectifier tube, protocol chip and step-down switch.
Through the observation of the charger PCBA module, it is found that this charger adopts flyback switching power supply design, synchronous rectification, fixed voltage output. The output is regulated by a step-down converter controlled by the protocol chip through two independent buck circuits, and power is automatically distributed. Let's start with the input to understand the information of each component.
At a glance at the input end, the fuse is located on the back of the motherboard, and the NTC surge suppression resistor, common-mode inductor, filter inductor, and multiple filter electrolytic capacitors can be seen on the front
A small rectifier plate is welded on one side of the module.
Remove the small board with no components on the back.
The chip fuse is from Beit Electronics and has a rated current of 3.15A.
NTC surge suppression resistors are used to suppress power-on inrush currents.
Close-up of common-mode inductor to filter out EMI interference.
The safety X2 capacitor comes from STE Matsuda Electronics and has a capacity of 0.22μF.
Close-up of FMB30M rectifier bridge, using two to evenly spread the heat.
The six high-voltage filter electrolytic capacitors are all from Ava, four of which are specified at 400V 15μF.
One specification is 400V 22μF.
One size is 400V 10μF.
Filter inductor close-up, jacket heat shrink tube protection.
On the other side in the middle is the transformer.
The primary main control chip of the charger comes from Nanxin Technology, using SC3057 combined sealing gallium nitride chip, this chip integrates high-performance multi-mode flyback controller, gallium nitride driver, gallium nitride switch, power supply and protection and other circuits into a thermally enhanced QFN6*8 package. Closing simplifies the number of external components and eliminates the influence of traditional drive trace parasitic parameters on high-frequency switches.
The SC3057 adopts the design of separating the power trace and control trace to reduce the influence of high-frequency switching on the control loop, and optimize the charger trace design and electrical performance through the optimized pad design, simplifying the design and development. SC3057 has a built-in 165mΩ gallium nitride switch, supports 175KHz switching frequency, and supports X capacitor discharge.
The charging head network learned through dismantling that the use of Nanxin Technology SC3057 also has Baseus 67W 1A1C gallium nitride charger, Anker 67W 2C2A gallium nitride desktop socket, Anker 65W 2C1A full gallium nitride fast charging socket, Huakesheng 65W 2C1A gallium nitride charger and other products.
Close-up of transformers.
CT 1018 optocoupler close-up for output voltage feedback.
SMD Y capacitor from Sichuan Teruixiang Technology Co., Ltd., with small size, light weight and other characteristics, very suitable for use in gallium nitride fast charging such high-density power products, material number TMY1681M.
Truixiang focuses on the research and development, production and sales of passive components, with a registered capital of 100 million yuan. It has two types of independent capacitor brands: SMD TRX and DIP TY capacitors, TRX will be committed to the research of ceramic materials to expand more categories of applications and provide customers with more solutions.
The charging head network learned that in addition to being used by dozens of high-power chargers such as Meiduoduo 100W gallium nitride, OPPO 65W super flash charging gallium nitride charger, Lenovo 90W gallium nitride fast charge, Nubia 65W gallium nitride charger, Baseus 120W gallium nitride + silicon carbide PD fast charging charger, etc., it can also be applied to 20W mini fast charging of brands such as Hailutong, First Guard, Belkin and other brands, and its performance has been unanimously recognized by customers.
The synchronous rectifier controller adopts Silicon SY5238, which is a synchronous rectifier controller that supports QR flyback and Silicon Jet's private ZVS flyback, with adaptive gate voltage control, and adopts DFN2*3-8 package.
The synchronous rectifier tube comes from AOS Bandai, model AON6220, NMOS, withstand voltage 100V, conduction 5.1mΩ, using DFN5*6 package.
At a glance at the output, the three USB females are soldered to independent small boards, and there are synchronous rectification filter solid capacitors, synchronous step-down inductors and other devices next to them.
Remove the small board and other devices on the front, you can see that there is a synchronous buck controller next to the USB-C2 and USB-A ports, that is, each of these two interfaces is equipped with independent secondary buck independence.
The synchronous rectified output filtered solid capacitor comes from Emerald and is specified at 25V 470μF.
The USB-C1 port mother is located on the small board with the corresponding protocol chip and output VBUS switch tube.
USB-C1 port protocol chip adopts Yingji IP2723T, the chip has passed the USB IF Association PD3.0 PPS certification, TID: 3135, is a fast charging protocol IC that integrates multiple protocols for USB output ports. Supports a variety of 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.
It can provide a complete TYPE-C solution for unidirectional output applications such as adapters and car chargers. In addition, IP2723T has a high level of integration and rich functions, which only requires few peripheral components in the application, effectively reducing the size of the overall solution and reducing the BOM cost.
Inchichip IP2723T data information.
The dismantling of the charging head network learned that Yingjixin IP2723T has been used by many brands of 20W chargers such as Flash, Momis, REMAX, Maiduoduo, Huakelon, etc., and is also used by Momax 65W 2C1A GaN fast charging charger, Nubia 65W USB PD GaN charger, Nubia 1A1C 45W Deuterium front gallium nitride fast charger and other gallium nitride chargers, in addition, Yingjixin fast charging chip can also be used in car charging, mobile power, adapter and other charging fields, and is used by Xiaomi, More than 100 products of well-known brands such as Beijing Tokyo Manufacturing, Huawei, Samsung, Tesla and so on.
Output VBUS switch tube silk screen printing 03301, NMOS, using DFN3*3 package.
USB-C1 port female seat close-up, via soldering.
The synchronous buck circuit scheme of USB-C2 and USB-A ports is exactly the same. The synchronous buck controller adopts Ingenixin IP6550, supports 5A output current, and the built-in synchronous buck controller switches at a fixed frequency of 135kHz. It can be used for two USB-A ports, or as a single buck, and the output voltage can be adjusted to meet more applications. IP6550 has built-in input over-voltage and under-voltage protection, built-in output over-current, over-voltage, under-voltage and short-circuit protection, integrated overtemperature protection in the chip, and supports EN control switch.
The IP6550 can be used for car chargers, multi-port adapters, smart power strips, USB-C support row and dashcam applications. Synchronous rectification buck has high conversion efficiency, high output current can be used for multi-port 5V output, and a wide range of voltage regulation can be achieved with PD protocol chip, meeting the application of USB PD3.1.
Another close-up of the IP6550 synchronous buck controller for USB-A port synchronous buck output.
The two synchronous buck switches are the same as the output VBUS switches of the USB-C1 port.
Close-up of two synchronous buck switches in the other way.
Both synchronous step-down inductors are protected by a heat shrink tube.
The synchronous buck output filter solid capacitor is specified at 25V 220μF and is also from Emerald.
Close-up of another solid capacitor with the same specifications.
A chip with silkscreen 2258A is used for automatic power distribution control.
USB-C2 and USB-A port protocol chips use Inchichip IP2736, integrated voltage reference in the chip, integrated programmable voltage/current loop control, integrated low-end current detection in the chip, and output support line loss compensation. Support optocoupler feedback for power adapter applications, support I2C and FB controlled DC-DC to change output voltage, support car chargers, energy storage power supplies, chargers, mobile power, power tools and other applications.
Thanks to the support of multiple feedback forms, IP2736 can be used with QR, ACF, LLC and other circuit architecture switching power supplies for PD fast charging, and can also be used with buck-boost circuits for high-power fast charging, car charging and mobile power and other applications.
Inchichip IP2736 details.
The disassembly of the charging head network learned that the Yingjixin fast charging protocol chip has been adopted by the fast charging products of large brand customers such as Xiaomi, Huawei, and Samsung, and the product performance and quality have been highly recognized by customers.
The USB-C2 port socket is located on a small board with an output VBUS switch tube.
The output VBUS switch is the same as that of the USB-C1 port female.
Close-up of the USB-C2 port female.
The USB-A port female panel is also equipped with an output VBUS switch of the same model.
Close-up of the USB-A mount.
All disassembled at a glance, come to a family portrait.
Charging head net disassembly summary
Zimi this 67W gallium nitride charger has 2C1A mainstream interface configuration, two USB-C ports not only support Mi private 67W fast charging, but also support 65W PD fast charging, USB-A port supports Xiaomi's 22.5W private fast charge, from the performance point of view, can not only meet the needs of Mi series mobile phone fast charging, but also for laptops, tablets and other devices PD fast charging, easy to carry out multi-purpose. In addition, the appearance design of Zimi is more exquisite, and the performance can also be based on this appearance value.
The charging head network learned through disassembly that this 67W gallium nitride charger PCBA module is wrapped with a heat sink and coated with thermal conductive glue to accelerate heat conduction. The charger adopts the SC3057 gallium nitride sealing chip of Nanxin Technology, and the synchronous rectifier controller of Silige is used to form a switching power supply with fixed voltage output.
The output adopts two protocol chips, IP2723T protocol chip and IP2736T, and IP6550 synchronous buck controller to realize the step-down fast charging output of three interfaces, and is equipped with a thermistor for overtemperature detection. The primary filter capacitor inside the charger is from Ava, and the secondary solid capacitor is from Emerald. The interior adopts multiple small plates combined welding, the internal space is compact, and the materials are reliable.