Previously, MI Xiaomi and ZMI Zimi have successively launched 39 yuan 20W PD fast charger, which has been widely concerned with solid materials and preferential prices. At present, the charging head network has obtained the purple rice 20W charger made of the new program, and the following will be disassembled in detail to see what changes the products have under the blessing of the new program.
First, the appearance of Zimi 20W charger
The top of the box has a hook design, and the front is printed with the ZMI brand, charger exterior and name, and USB-C interface logo.
The service phone is printed on the back and a production plant information tag is attached.
Charger parameter information is printed on the side.
Manufacturer: Nanjing Kuke Electronic Technology Co., Ltd
Production plant: Dongguan Fu Ruikang Holdings Co., Ltd
Producer: Jiangsu Zimi Electronic Technology Co., Ltd
The charging head network learned that the products produced by Frederick also include Xiaomi 65W Gallium Nitride Fast Charge Charger, Xiaomi 65W USB PD Fast Charge Charger AD651, Xiaomi 18W PD Fast Charge Charger, Zimi 65W USB PD Fast Charge Six-digit Extension Cable Plug Board CXP01 and so on.
The package contains a charger and instruction manual.
This charger waist piano paint treatment, input and output ends are cut surfaces, and the shell is matte, the front center of the fuselage is printed with the ZMI brand logo.
Charger parameters are marked on the input housing
Model: HA716
Input: 100-240V~50/60HZ 0.5A
输出：5V3A、9V2.22A、12V1.67A，20W Max
The product has passed the 3C certification and the VI energy efficiency certification.
The input end is equipped with fixed GB pins.
Top USB-C port center design, white rubber core.
The length of the charger measured using the vernier caliper is 42.97mm.
The width is 37.94mm.
It is 21.98mm thick.
Compared with the Apple 20W charger, the volume is smaller.
Intuitive feeling in the hand.
Net weight approx. 45g.
Use the DeveloperLAB Power-Z KT002 to read the output protocol of the USB-C port, and the display supports Apple 2.4A, Samsung 5V2A, DCP protocol, as well as QC2.0/3.0, AFC, FCP, PD3.0 fast charging protocols.
The PDO message shows that the USB-C port also has three fixed voltage levels of 5V3A, 9V2.22A and 12V1.67A.
Second, zimi 20W charger disassembly
Detach the output housing and use an ultrasonic solder package at the edges.
At a glance on the front of the PCB board, each component is glued and reinforced, and the input and output filter capacitors are insulated, and one of the capacitors is transverse.
At a glance on the back of the PCB board, the primary side is equipped with a rectifier bridge and a main control chip, and the main control chip integrates a switching MOS tube; and the secondary side is equipped with a synchronous rectifier chip, a protocol IC and a VBUS switch.
After observation and analysis of the charger circuit, it is found that the charger adopts the classic architecture of switching power supply with wide range output and protocol control output voltage. Let's start with the inputs to understand each component.
Input at a glance.
The smd fuse has a rated current of 2A.
NTC surge suppression resistor close-up for suppressing uprush current.
Close-up of abs210 rectifier bridge.
The black high voltage filter electrolytic capacitor comes from AiSHi.
The specification is 400V 10μF.
At a glance at the side of the PCB board, another high-voltage filter electrolytic capacitor is also from Aihua.
It has a specification of 400V 22μF.
Close-up of the I-beam inductance.
On the other side of the PCB board, there is a power supply capacitor and a transformer.
The main control chip power supply capacitor is also from Aihua, with a specification of 100V 10μF.
The charger main control chip adopts Biyi Micro KP22306SGA. The chip has built-in 650V 1.5R high voltage MOSFET, integrated input undervoltage (BOP), overvoltage protection (OVP), ultra-wide VDD operating range: 8V-40V, to meet the requirements of 20W fast charging.
KP22306SGA supports high voltage start-up, patented light load mode to achieve ultra-low standby < 30mW; quasi-resonant control, maximum operating frequency of 80kHz; patented EMC jitter design, EMC Easy Pass; valley lock function, light load mute work; output overcurrent point adaptive adjustment; built-in slope compensation, overcurrent point compensation, etc.
Transformer close-up.
Edrawn EL 1019 optocoupler for primary secondary communication, feedback regulation output voltage.
At a glance at the output, the USB-C female is reinforced with a steel sleeve and isolated from the transformer by an insulating plate, with Y capacitors and output filter solid capacitors on both sides.
A close-up of the blue Y capacitor for output immunity.
The secondary synchronous rectification chip also uses Biyi Micro KP41262. This is a high-performance synchronous rectifier power switch that replaces the secondary-side Schottky pole in flyback converters with an ultra-low on-resistance power MOSFET built in to improve system efficiency. Supports High Side and Low Side configurations, as well as system intermittent operating mode (DCM) and quasi-resonant operating mode (QR).
Biyi micro KP41262 data information.
The output filtered solid capacitor is 16V 820μF.
The USB PD protocol chip adopts Huinengtai HUSB350. This is a high-performance, highly integrated USB TypeC Power Delivery controller, integrating PD2.0, PD3.0, PPS, QC2.0/3.0, AFC, FCP, BC1.2, DCP, 5V/2.4A and other charging protocols; suitable for power adapters, car chargers, mobile power and other applications; support SOP-14L and QFN-16L two packages.
Charging head network link, Huinengtai HUSB350 has previously been Grapefruit 18W fast charge charger, Locke 65W gallium nitride PD fast charge, flying frequency 65W USB PD gallium nitride charger, ABB four-digit USB output 18W PD fast charging socket use, in addition, Huinengtai PD fast charging protocol chip has been used by Dozens of products made in Beijing, Belkin, Turas, Nanfu and many other brands.
The output VBUS switch tube adopts Toshiba TPCC8104, PMOS, and has a withstand voltage of 30V.
Toshiba TPCC8104 data information.
USB-C interface female jacket steel sleeve welding reinforcement, not easy to deform.
All disassembled, let's take a family portrait.
Charging head net disassembly summary
Although Zimi this charger adopts a new fast charging scheme, the overall appearance is the same, and then the actual measurement found that neither the three-dimensional size nor the overall output performance has changed. Support QC, FCP, AFC, PD fast charge protocol, compatible protocols are the same, to meet the iPhone 12 20W fast charging requirements, the overall use experience can be maintained.
The charging head network learned through disassembly that the charger adopts the Biyi micro KP22306+KP41262 high-integration fast charging scheme, and the primary controller is integrated with MOS tubes, which is very helpful for shortening the charger production cycle. Another change is the use of Huinengtai HUSB350 protocol IC and Toshiba output VBUS switch tube. The capacitor that affects the service life of the charger still comes from Aihua, and the overall material is still solid and reliable.