preface
With the release of Apple's super cup mobile phone, the mainstream fast charge power continues to increase, from the former 18W to 20W, the launch of the iPhone 13, the mainstream fast charge power to 27W, the charger upgrade to 30W is also imperative. At the same time, 30W fast charging can also provide PPS fast charging for Android mobile phones, which is more friendly to multi-machine parties.
The well-known manufacturer Zimi has newly launched a 30W power gallium nitride charger, with a rounded shape, with folding feet, convenient storage, and a good feel. The following charging head network disassembles this gallium nitride charger to see how the internal material is.
Zimi 30W Gallium Nitride charger unboxed
The front of the box is printed with the ZMI brand, charger exterior, name and GaN logo.
Charger parameter information is printed on the back.
The package contains a charger and instruction manual.
Charger shell gray contrast design, the surface of the frosted anti-fingerprint, the overall is very small.
The charger is equipped with foldable GB plugs to further enhance the portability of the product while carrying other devices in the bag without scratching.
Charger parameters are printed on the input housing
Model: HA719
Input: 100-240V~50/60HZ 0.8A
输出:5V3A、9V3A、11V2.75A、12V2.5A、15V2A、20V1.5A
Manufacturer: Nanjing Kuke Electronic Technology Co., Ltd
Producer: Jiangsu Zimi Electronic Technology Co., Ltd
The charger has been CCC certified.
The top surface is equipped with a single USB-C interface, one-sided layout, and a white rubber core.
The measured height of the charger body was 37.99mm.
The width is 30.92mm.
The thickness is 31.02mm.
Compared with Apple's 30W charger, the volume advantage is obvious.
The size of the charger held in the hand is intuitive.
Net weight is approximately 48g.
Using the ChargerLAB POWER-Z KT002, the C port supports QC2.0/3.0, AFC, FCP, PD3.0, ppS fast charge protocol.
In addition, the PDO message shows that the C port also has five fixed voltage levels of 5V3A, 9V3A, 12V2.5A, 15V2A, 20V1.5A, and two sets of PPS voltage levels of 5-11V2.75A and 5-20V1.5A.
Zimi 30W Gallium Nitride charger disassembled
After having a basic understanding of Zimi's 30W Gallium Nitride charger, continue to disassemble it below to see how the material works.
Disassembling begins with the charger output housing, first priing off the gray housing to reveal the internal PCBA module.
The internal PCBA module is extracted and soldered by two PCB stacks, making full use of the internal space to reduce the volume.
The charger's internal folding pins are fixed with a black plastic cover with screws.
The measured PCBA length is about 25mm.
The width is approximately 25.9mm.
The height is approximately 25.5mm.
Module input and output platelet list, input side welding rectifier bridge, small board welding patch Y capacitor and feedback optocoupler, output side welding USB-C female and synchronous rectifier and other components.
The other small board is the primary part, welding a gallium nitride sealing chip and filter capacitor and transformer.
Transformers and primary capacitors are insulated using plastic insulating brackets and secondary circuits.
Output filtering solid capacitors are also placed in the bracket to simplify insulation design.
Above the USB-C female seat is a plastic insulated bracket.
Welding separates the small board from the transformer for detailed disassembly.
The input plate is close-up, the pads on both sides of the fuse are soldered for connecting the AC input, and the AC power is fed into the rectifier bridge through the fuse, and output from the right pad to the primary part of the platelet.
The input delay chip fuse is 2A 250V for input overcurrent protection.
The rectifier bridge comes from Yangjie, model RABS210, 2A 1000V, the AC rectifier becomes a pulsating DC current, through the right side of the pad, output to the primary plate filter capacitor for filtering, power supply to the primary circuit.
Two filter capacitors, a differential mode filter inductor and a small capacitor that powers the main control chip are soldered on the small board, one of the smaller electrolytic capacitors is wound around the tape insulation, and the transformer has been removed.
The two high voltage filter capacitors are from AiSHi Aihua, a miniaturized capacitor for RK series chargers, 105°C heat-resistant, and 400V 22μF.
Differential mode filter inductor, I-core, jacket heat shrink tubing wrapped insulation.
The other filter capacitor is 400V 33μF, for a total capacity of 55μF.
The switching power supply main control chip adopts the SC3056 of Nanxin Semiconductor. The SC3056 is a high-frequency quasi-resonant flyback converter with high efficiency and reliability derived from the SC305x series of Southern Core Semiconductor. The SC3056 integrates a 650V voltage-resistant switch tube, which can easily drive the 30W to 40W output power range.
The SC3056 operates in QR and DCM modes with valley turn-on for efficiency, adaptive frequency foldback for high efficiency over the full load range, and Burst Mode operation at no load to reduce standby power consumption. The converter has built-in high-voltage start-up circuitry for ultra-low standby power consumption and ultra-fast start-up speed. It also integrates a soft-start circuit, as well as a segmented power supply circuit for an ultra-wide output range. Ultra-low operating current in burst and fault modes to meet standby efficiency requirements. The maximum operating frequency is 175KHz, which greatly reduces the size and cost of magnetic devices. Full power range with jitter feature to improve EMI performance.
The chip has built-in overtemperature protection, power supply overvoltage protection, power supply undervoltage lockout, cycle-by-cycle current limiting, two-stage overcurrent protection, output overvoltage protection, output short circuit protection and overload protection, providing a complete and comprehensive protection function.
According to the charging head network, Nanxin Semiconductor's fast charging solution is widely used in chargers, wireless charging, car charging, charging treasure, energy storage power supply and other aspects, and has been Luxun Precision 65W 1A1C gallium nitride fast charging, Huawei 66W super fast charging car charging, Huawei 50W super fast charging wireless car charging, Zimi 2000W PD fast charging mobile power supply, Xiaomi 20000mAh mobile power supply 50W super flash charging version, Samsung 10000mAh 25W PD fast charging mobile power supply, Bull 600W outdoor mobile power supply, Anker PowerHouse II 400 outdoor power supply and dozens of other products are used, and the quality is highly recognized by customers.
Power supply inductor for SC3056 segmented power supply.
The electrolytic capacitor that powers the filter for the South Core SC3056, from AiSHi, has a specification of 50V 10μF.
Transformer close-up, the output is multi-layer insulated wire, the output line is fixed in the insulated housing, easy to assemble.
The CHIP Y capacitor comes from Sichuan Terry Xiang Technology Co., Ltd., which has the characteristics of small size and light weight, which is very suitable for high-density power products such as gallium nitride fast charging. Part number is TMY1471K.
The charging head network learned that in addition to being used by dozens of fast charging products of Brands such as Belkin, Anker, QCY, Shengli, Maddo, OPPO, Lenovo, Nubia, Beth, Hailutong, First Guard, etc., in addition to being used by Igor 40W LED drive power supply, Changhong 42-inch intelligent network TV 42P3F built-in power supply, Zhuo Feihang 45W Gallium nitride ultra-fast wall charging and other products, the performance has been unanimously recognized by customers.
The CT1018 optocoupler used to feedback the adjustment output voltage is controlled by the protocol chip by changing the light emitting intensity of the internal light-emitting diode of the optocoupler, and the change is detected by the primary master chip, so as to achieve output voltage feedback.
Synchronous rectifier tube from Zhenmaojia, model ZMS100N10N, NMOS, withstand voltage 100V, conductivity 10mΩ, using DFN5*6 package.
Synchronous rectifier controller using Nanxin Semiconductor SC3503, which is an adaptive turn-on detection and fast shutdown synchronous rectifier controller, no need for auxiliary coil power supply, output voltage can be as low as 0V, patented adaptive opening detection circuit to avoid synchronous rectifier mis-opening, compatible with a variety of MOS, with ultra-low quiescent current, support a variety of operating modes, support high-side and low-side synchronous rectification, peripheral components are very streamlined. Available in SOT23 package, it is suitable for wide range flyback adapter applications.
Nanxin SC3503 data information.
The charging head network disassembly learned that the chip has been adopted by Greenlink 65W Smart Charging Magic Box 2C2A Gallium Nitride Fast Charging Socket, TEGIC Mini 30W Gallium Nitride Fast Charging, Greenlink Mini 30W Gallium Nitride Fast Charger, Zhengtuo 65W 2C1A Gallium Nitride Charger, Weiyuan New Energy 30W 1A1C Gallium Nitride Fast Charger, Image 65W Gallium Nitride Charger, Nubia 30W Gallium Nitride Fast Charger and other products.
Output filtered solid capacitors from Polycap Berry Kai, VA series 105°C heat-resistant, specifications of 330μF 25V.
The USB PD fast charging protocol chip adopts Infineon CYPD3174, which supports PD3.0 including PPS protocol, supports QC4.0, Apple 2.4A and other fast charging protocols, built-in multiple comprehensive protection functions, built-in 32-bit M0 processor, integrated oscillator and no external clock. The lower right corner of the chip NTC1 is a thermistor, at the USB-C interface, used to detect the internal temperature of the charger for overtemperature protection.
VBUS switch tube from Toshiba, model TPCC8104, PMOS tube, withstand voltage 30V, conductivity 6.8mΩ.
USB-C female close-up, white rubber core, via welded fixed.
All disassembled, let's take a family portrait.
Charging head net disassembly summary
The Zimi 30W charger uses the same design language as the recently launched 35W dual-port charger, and the folding pin is compact and portable. The charger supports five sets of outputs of 5V3A, 9V3A, 12V2.5A, 15V2A, 20V1.5A, and two sets of PPS voltage levels of 5-11V2.75A and 5-20V1.5A, which are very good for Apple and Android mobile phones, and also support laptop charging.
The charging head network learned through disassembly that the Zimi 30W charger uses two PCB combination welding, and the L-type structure internally arranges the transformer and filter capacitor to maximize the use of internal space to reduce the volume of the charger. Primary and secondary filter capacitors are isolated by custom insulating brackets, simplifying the production process.
The charger internally uses the SC3056+SC3503 gallium nitride fast charging source solution of the well-known manufacturer Nanxin Semiconductor, and the Zimi 35W dual-port charger has also chosen this power supply scheme before. The charger adopts AiSHi electrolytic capacitor filtering inside, uses Infineon protocol chip, external thermistor for temperature detection, and the overall workmanship material is solid and reliable.