Preface
Xiaolai has launched the Flint 300 Outdoor Power Bank, which is a lightweight outdoor power station that weighs only 3.4 kg and can be easily lifted with one hand. The outdoor power station has a built-in 300Wh lithium battery, a built-in sine wave inverter with an output power of 300W and a peak output power of up to 600W.
There is a wireless charging area on the top of the outdoor power station, which supports 15W wireless charging output. The power station supports DC and USB-C interface charging, both ports support 100W charging power, support solar panels, car charger and PD fast charging charging. In terms of output, the USB-C port has a 100W fast charging output, the USB-A port supports 12W output power, and the car charging interface supports 120W output power.
There is a display screen on the side of the fuselage, which can display the input and output power of the outdoor power supply, the remaining use time and the percentage of power and other parameters, which is convenient for users to grasp the power information, and the outdoor power station fuselage is also set up with two charging sockets for the U small core battery, which can charge the U small core battery, and the following charging head network will bring the dismantling of the Xiaolai flint 300 outdoor mobile power supply, let's take a look at the internal materials and design.
Xiaolai flint 300 outdoor power bank unboxing
The power station is packaged in a color box, and the front is printed with a sketch of the appearance of the product and the energyHUB and Litheli brands.
Product features and built-in capacity are introduced on the side of the package.
On the other hand, the use scenarios of Xiaolai U4 batteries are introduced.
There are product parameter stickers on the side of the package, and the detailed information will be introduced to the physical display.
The inside of the package is filled with foam.
Inside are two Xiaolai U4 batteries.
Underneath the battery is the power station body and the accompanying accessories.
Display of the contents of the package.
All accessories include USB-C charger, two U4 batteries, USB-C charging cable, car charging cable and solar panel charging cable, power station body and manual.
On the left side panel of the fuselage are two Xiaolai U small cell battery charging compartments, the upper middle is the LCD display screen, the lower side is the DC input interface, the USB-A output interface, the two-way Type-C interface, the right side is the cigarette lighter output interface, and the lower part is the DC output switch and power switch.
There are charging pins inside the U small cell battery charging compartment, which are connected to the battery for charging.
The output port of the cigarette lighter is equipped with a dustproof protective cover.
There is a wireless charging panel on the top of the fuselage, the coil area is marked, and there is an integrated handle on the left side of the fuselage.
The side of the fuselage is equipped with an inverter switch, an output socket and a cooling fan outlet.
There are anti-slip pads on both sides of the bottom of the fuselage to play the role of anti-slip and cushion protection products.
There is an information nameplate on the bottom of the product
Product model: B300
主机容量：14.4V 20.8Ah 300Wh
U 小芯电池总容量：4V 8Ah 32Wh
Total output power: 300W
交流输出（x1）：额定300W，220-240V，AC，50HZ
USB-A输出（x2）：5V2.4A，12W（Max）
TYPE-C输出(x1):5V3A/9V3A/12V3A/15V3A/20V5A,100W(Max)
Wireless charging module (x1): 15W
车充口输出（x1）：12.0V10A，120W（Max）
太阳能充电输入（DC7909）：100W（Max) 11-30V-7A
车充输入（7DC909）：100W（Max）7A
TYPE-C输入:5V3A/9V3A/12V3A/15V3A/20V5A,100W(Max)
放电温度：-20-45℃（±3℃）
充电温度：0-45°C（±3℃）
Storage temperature: 0-60°C
Manufacturer: Zhejiang Dongyi New Energy Power Technology Co., Ltd
The length of the mobile power bank is about 283mm.
The width of the fuselage is about 145mm.
The height of the fuselage is about 143mm.
The weight of the outdoor power station is about 3.4kg.
测得两个USB-A接口均支持Apple 2.4A、Samsung 5V2A、DCP协议。
使用ChargerLAB POWER-Z KM003C测得USB-C口支持FCP、SCP、AFC、QC3.0+、PD3.0、PPS、QC5、DCP、Apple 2.4A充电协议。
PDO报文显示USB-C口还具备5V3A、9V3A、12V3A、15V3A、20V5A五组固定电压档位,以及3.3-11V3A和3.3-21V3A两组PPS电压档位。
Use Baseus charger to charge the outdoor power station through the USB-C interface, and the input power is displayed as 91W.
Use 12V to charge the outdoor power supply through the car charging interface, and the input power display is 74W.
Xiaolai flint 300 outdoor power bank dismantling
After reading the appearance display and functional test of Xiaolai flint 300 outdoor mobile power supply, let's disassemble it and take a look at the internal materials and design.
First, unscrew the fixing screws at the bottom of the fuselage, disassemble the fuselage shell, and connect the wireless charging module with a cable to supply power.
Disconnect the cable and disassemble the housing.
The inside of the housing is fixed with injection molded copper screws.
Disassemble the buckle and take out the wireless charging module.
The wireless charging module welds wireless charging master control, wireless charging power tube, resonant capacitor and other components.
The wireless charging main control chip adopts Yingjixin IP6808. This is a wireless charging transmitter control SoC chip, compatible with the latest WPC Qi V1.2.4 standard, supports A11 coil, supports 5W, Apple 7.5W, Samsung 10W wireless charging. IP6808 integrates a full-bridge drive circuit and a voltage & current ASK communication demodulation module, which has a high degree of integration, effectively helping to reduce the solution size and BOM cost.
Yingjixin IP6808 data information.
According to the dismantling of the charging head network, the wireless charging products using Yingjixin IP6808 also include TEGIC 8000mAh wireless charging power bank, Mai Bubble POP CANDLE multi-purpose wireless power bank, Qiaoyou 6500mAh Yijie magnetic wireless power bank, omnicharge OMNIMOBILE 12800 PRO mobile power bank, Momis Q.POWER Plug three-in-one charger, etc. In addition, Yingjixin's wireless charging and fast charging chips have been adopted by dozens of products.
The LM321 single op amp is used for signal demodulation.
Close-up of two silk-screened 302 wireless charging power tubes.
The wireless charging resonant capacitor is from Keya, which is a special capacitor for wireless charging of ZZEC series, with a specification of 0.25μF100V.
The other side of the wireless charging module is equipped with a wireless charging coil, which is wound with yarn wrapped wire.
The inside of the outdoor power supply is at a glance, the lower left is the inverter module, and the barley paper is pasted to form the air duct. A fast charging module is provided on the side of the case, and the inverter and battery pack are connected via XT60 connectors.
Tear off the pasted barley paper.
There is a cooling fan on the left side of the inverter module to speed up air circulation and take away the heat generated by the work.
Disconnect the connectors of the battery pack and inverter and continue with the disassembly.
First, remove the fast charging panel on the side of the fuselage.
Above the battery pack is the inverter module.
Remove the inverter module and output socket, and underneath is the battery pack, which is secured by screws.
The inverter module is fixed to a plastic partition using screws.
Remove the cooling fan on the left side.
The cooling fan is from Shenghui Co., Ltd., model CHA4012BX-20D, rated voltage of 12V, current of 0.5A.
The front view of the inverter module shows the DC input in the upper right corner, and the wires are connected by soldering. The fuse is soldered on the right side and the filter capacitor is entered. On the left side of the filter capacitor is the step-up switch and the step-up transformer. The rectifier bridge is below the transformer, the film filter capacitor is on the left side, the high-voltage filter capacitor is on the left side, the heat sink on the left side fixes the output modulation tube, the left side is the filter inductor above the heat sink, and the EMI circuit and control board are on the top.
A dual driver is welded to the back to drive the boost switch.
Two 40A fuses are connected in parallel at the input of the inverter for overcurrent protection.
The fuse is glued and reinforced on the side.
The input filter capacitor is from Fengbin, with a specification of 1500μF 25V, and three in parallel.
The MCU used for boost control is from ARTERY, the model is AT32F421K8U7, the chip has a built-in ARM Cortex M4 CPU, the main frequency is 120MHz, the built-in DSP instruction set, the chip integrates 64KB FLASH and 16KB SRAM, with two I2C interfaces, two SPI interfaces, two USART interfaces, and is in a QFN-32 package.
The low-side dual driver from Jewalt, model JW9624, is a dual-channel, high-speed low-side gate driver that supports driving MOS transistors, GaN and IGBTs. The device contains two independent gate drive channels, supports 4.5A peak current, supports independent channel output control, is TTL and CMOS drive level compatible, operates from 4.5-20V, and is available in a SOP-8 package.
Jewalt JW9624 Profile Information.
A thermistor is also fixed on the heat sink of the boost switch to detect the temperature rise.
升压开关管来自新洁能,型号NCEP60T18,NMOS,耐压60V,导阻2.8mΩ,采用TO-220-3L封装。
The transformer is made of PQ32 core, which is tightly wound and insulated with tape.
The relay is from Hongfa, model HF33F/012-ZST, coil voltage 12V, built-in set of conversion terminals, contact capacity 5A, used to control AC output.
The film capacitors are from Xiamen Farah Electronics.
The rectifier bridge model is EGBU406, which is an ultra-fast recovery rectifier bridge with a specification of 4A 600V.
The thin-film filter capacitor is from Xiamen Farah Electronics, and the specification is 1μF 630V.
The high-voltage filter capacitor is from Fengbin and is specified at 120μF 450V.
Two 200mΩ resistors are connected in parallel to detect the rectifier output current.
A thermistor is provided on the heat sink of the output modulation switch to detect the temperature.
The IGBT used for output modulation is from Jilin Huawei, model JT015N065FED, specification is 15A 650V, and it is in TO-220MF package.
One filter capacitor is 47μF 25V.
There is a control board on the back of the heat sink.
A 1117 regulator chip is welded on the back of the control board, and the output voltage is 3.3V.
The two isolated drivers are from NOVOSENSE, model NSi6801BD, which is a single-channel optocoupler-compatible isolated gate driver with a peak source and sink current of 5A.
Close-up of the output filter inductor.
The thin film filter capacitor specification is 1μF 630V.
Magnetic ring filter inductors and safety X2 capacitors at a glance.
The safety X2 capacitor is from Tiantai and has a specification of 0.1μF.
Four optocouplers are used for communication between the primary stages of the inverter.
Next, disassemble the side panel of the outdoor power bank.
There are buttons and LED indicators on the button board.
The connector is soldered on the back of the small board.
The output socket is connected by wire welding.
Inside the case, there is a fast charging panel to connect the cigarette lighter socket and the battery charging socket.
Remove the fast charging panel and battery charging socket.
There is an LCD screen on the front of the fast charging panel.
The screens are connected by cables.
The LCD screen module is from Futurelcd.
Set the backlight cable on the back of the screen.
The front of the fast charging panel is at a glance, with two charging circuits on the left side for charging the U small cell battery, and two step-down inductors on the right side are the charging circuit and the USB-A interface step-down. The lower part is the DC input socket, and the lower part of the DC input socket is equipped with a magnetic ring inductor for synchronous buck-boost voltage conversion.
The right side of the two step-down inductors is equipped with a screen driver chip, the right side of the screen driver chip is equipped with a synchronous buck-boost controller, and the right side is a synchronous buck-boost MOS tube and a buck-boost inductor. The right side of the cigarette lighter interface is the step-down inductor, and the lower part of the step-down inductor is the filter inductor.
At a glance on the back of the fast charging panel, the upper left corner is welded with a synchronous buck controller and a buck MOS tube, the lower left corner is welded with the main control MCU, the middle is welded with a synchronous buck converter and a buck inductor, two synchronous buck converters and two battery protection chips are welded on the top right, and a synchronous buck-boost controller and a synchronous buck-boost switch are welded in the lower right corner.
主控MCU来自CHIPSEA芯海科技，型号CS32F030C8T6，芯片内置ARM Cortex-M0 MCU，主频为48MHz，内置64KB FLASH和8KB SRAM，具备两个UART接口，两个SPI接口，两个I2C接口，采用LQFP48封装。
Chipsea Technology CS32F030 Profile.
The switching step-down chip is from JWBH, silk-screen JWBH, the actual model is JW5026, it is a synchronous step-down converter with a withstand voltage of 40V, the output current is 1A, the switching frequency is fixed at 1.1MHz, with input voltage lockout, integrated soft start, support current loss control protection, short-circuit protection and overtemperature protection, and SOT23-6 package.
Jewalt JW5026 Profile Information.
Close-up of 10μH buck inductor.
The voltage regulator chip is from SEAWARD, model SE8750, which is an ultra-low quiescent current LDO, with an input withstand voltage of 40V, an output voltage of 5V, and an output current of 200mA, and is packaged in SOT-89-3.
The voltage regulator chip is from SEAWARD, model SE8533, the input withstand voltage is 40V, the output voltage is 3.3V, the output current is 250mA, and it is in SOT-89-3 package.
The buzzer is used for key cues.
The LCD screen driver chip is from Tianwei, model TM1621, supports 32*4 segment LCD driver, integrates RC oscillator inside, adopts four-wire serial interface communication, and is SSOP48 package.
3PEAK TP2412 dual op amp is used for signal detection amplification.
The other double op amp is of the same model.
A total of three SRP TP2412 op amps were used.
The synchronous buck-boost converter for charging and discharging of the USB-C interface comes from Yingjixin, model IP2368, the chip has a built-in four-tube H-bridge synchronous buck-boost switch tube drive, supports PD3.0, AFC, FCP and other fast charging protocols, can automatically apply for fast charging to charge at maximum power, the input terminal supports 5-20V voltage, through the buck-boost voltage conversion, automatically switch the boost or buck, adjust the output voltage to charge multiple strings of battery packs, and also support a maximum of 100W reverse discharge output.
Yingjixin IP2368 supports the use of 2-6 battery packs in series, the battery is full of voltage to support resistance setting, and is suitable for lithium iron phosphate and ternary lithium batteries, which fully meet the battery types of different equipment. IP2368 supports four-lamp battery level indication by default, and the initial capacity of the battery pack can be configured through resistors to achieve accurate power display.
Yingjixin IP2368 data information.
IP2368 is equipped with four switches to form a synchronous buck-boost circuit, the synchronous buck-boost switch is from Jiejiewei, model JMSL0406AG, NMOS, withstand voltage 40V, conduction resistance 4.2mΩ, using PDFN5*6-8L package.
The VBUS switch is the same model.
The 3mΩ sampling resistor is used to measure the charge and discharge power of the USB-C interface.
The buck-boost chip used for DC interface input to charge the outdoor power station is from Nanxin Technology, model SC8815, which is used for DC input buck-boost voltage conversion to charge the built-in battery. The SC8815 is a bidirectional synchronous buck-boost controller with an integrated I2C interface, supporting a 2.5-36V input and output voltage range for battery charging.
Among them, the battery charging current and voltage, reverse discharge output voltage, and input and output current limit can all be controlled by the I2C bus, and the chip has under-voltage protection, over-voltage protection and over-current protection, and supports short-circuit protection and over-thermal shutdown protection.
According to the dismantling of the charging head network, Nanxin's fast charging solution is widely used in mobile power supplies, chargers, car chargers and other fields, and has been used by Anker PowerHouse II 400 outdoor power supply, Empire 300W portable energy storage power supply, Zimi 20 200W PD fast charging power bank, Zhengtuo 100W bidirectional fast charging mobile bank SuperTank Pro, Samsung 10000mAh 25W PD fast charging power bank, Xiaomi 20000mAh mobile power bank 50W super flash charging version and other dozens of products.
The synchronous buck-boost MOS tube adopts Jiejie micro-JMSL0406AG.
Close-up of magnetic ring buck-boost inductor.
The DC socket is fixed in the PCBA module by soldering.
The DC socket is connected by wire soldering, and the SMD fuse is from Blaupunkt and is 10A.
The MOS transistor for input control is from Zhenmaojia, model ZM071P03N, PMOS, withstand voltage -30V, conduction resistance 7.1mΩ, and comes in DFN5*6 package.
CR Micro CR4437 PMOS is used for charging output control.
The synchronous step-down chip used to power the battery charging circuit is from Nanxin Technology, model SC8112, which is a dual-output synchronous step-down converter, with an integrated switch inside the chip, supporting 4.6-36V input voltage, output current 6A, the output voltage can be set by the voltage divider resistor, supporting high-precision output current limit, and the total output power can be set by the resistor, which is convenient for constant power output.
Nanxin SC8112 details.
The MOS transistor for output control is from Ruijun Semiconductor, model RU30S15H, dual PMOS, withstand voltage -30V, conduction resistance 15mΩ, and is available in SOP-8 package.
The charging chip for charging the U small chip battery comes from Yingjixin, model IP2312, which is a synchronous step-down charging chip with a built-in switch, with an integrated switch inside the chip, the maximum charging current is 3A, the charging current supports adjustment through external resistance, supports LED charging status indication, supports NTC temperature protection, has input over-voltage and under-voltage protection and over-temperature protection, and adopts ESOP8 package.
Yingjixin IP2312 data information.
Saixin XB8886A integrated battery protection chip is used for battery overcharge protection.
The step-down chip for the output of the two-way USB-A interface also comes from Nanxin Technology, model SC8112, which is the same model as the battery charging step-down chip.
Close-up of the corresponding two step-down inductors.
Close-up of USB-A and USB-C interfaces, secured by via soldering.
The upper button is the DC output control switch, and the lower button is the power switch of the whole machine.
The XT60 connector on the left is used to connect the inverter, the XT60 connector on the right is used to connect the battery pack, and the two 3mΩ resistors are used to detect the inverter current.
The step-down controller is from Xintan Micro, model NDP1415RB, is a 40V withstand voltage synchronous step-down controller, supports 20A output current, and is used for 12V output of outdoor power supply.
The synchronous step-down switch is from Ruijun Semiconductor, model RU3089M, NMOS, withstand voltage 30V, conduction resistance 2.4mΩ, and comes in a PDFN5060 package.
The other synchronous step-down switch is of the same model.
The chip fuse at the input end of the buck circuit is from Blaupunkt and has a specification of 15A.
The two input filter capacitors are 100μF35V and 220μF25V, respectively.
The output filter capacitor specification is 330μF 16V, and two are connected in parallel.
A 5mΩ sampling resistor is used to sense the output current.
The cigarette lighter socket is supplied with power by a wire soldering connection.
A synchronous step-down chip from M3TEK Laijie, model MT3905, supports 30V input voltage, continuous output current 4A, peak output current 5A, integrated switch inside the chip, supports 100% duty cycle output, with short-circuit protection and thermal shutdown protection, and adopts SOP8-EP package.
Close-up of 6.8μH alloy buck inductor.
There are metal pins inside the U small cell battery connector.
Close-up of the internal spring structure for fixing/removing the battery.
The battery pack is secured to the bottom of the case using screws.
Unscrew the set screws and remove the internal battery pack.
A protective plate is provided on the side of the battery pack.
Observe the internal battery through the battery bracket, the outdoor power station has a built-in 18650 battery, the battery is from DMC, the signal is INR18650-26E, the nominal capacity is 2600mAh, and the nominal voltage is 3.65V.
Tear off the Mylar sheet pasted on the side of the battery pack, and the battery pack is connected to 4S8P, with a total of 32 cells.
The other side of the battery pack is also insulated with Mylar sheets.
The protective plate is connected to the nickel sheet by welding.
The front of the protection board is at a glance, with a fuse on the left side, a battery protection chip in the middle, a battery protection tube and a current detection resistor on the right side, and an output line that is soldered.
The fuse connected to the positive terminal of the battery is from Blaupunkt, which is a DPG1445 three-terminal fuse, supports 4 strings of battery applications, has a rated current of 45A, and has a control terminal that can be controlled by the protection chip to cut off the battery path.
The battery protection chip comes from Saiwei Microelectronics, model CW1274, which is a battery protection chip that supports the application of 7 strings of lithium batteries, supports a variety of lithium battery protection such as lithium iron phosphate and high-voltage platforms, supports battery balancing, and supports high-precision overcharge, over-discharge, and over-current protection. It also supports functions such as battery temperature protection and disconnection protection.
Close-up of bleeder resistors and MOS tubes for cell balancing.
The battery protection tube is from Weizhao Semiconductor, model VS3602GPMT, NMOS, withstand voltage 30V, conduction resistance 0.6mΩ, in PDFN5*6 package, using two in parallel.
Weizhao Semiconductor VS3602GPMT Profile Information.
Two 1.5mΩ resistors are connected in parallel to detect the battery pack current.
Slide switches are used to control the battery pack output.
The battery secondary protection chip is silk-screened R01 AEL, and when the battery overvoltage is detected, the output control signal cuts off the fuse for battery pack overvoltage protection.
The MOS used to control the fuse adopts the Jiejie micro-JMSL0406AG.
The battery pack adopts XT60 connector.
A list of all dismantling and a family photo.
Summary of the dismantling of the charging head network
The Xiaolai Flint 300 outdoor power supply is composed of a silver-gray shell with black side panels, and the body is equipped with an integrated handle, which is very convenient for daily carrying and storage. The side of the power station is equipped with a display panel and connection interface, and a ventilation grille is provided to dissipate heat from the internal inverter module with a fan. The power station has a built-in 300Wh lithium battery, supports 300W AC output, and the USB-C interface supports 100W bidirectional charging and discharging.
Through the dismantling of the charging head network, it is learned that the outdoor power station adopts a modular design inside, which is composed of a fast charging panel, a battery protection board, a battery pack and an inverter module. The inverter module is a unidirectional inverter output equipped with a heat sink and a cooling fan. The power station has a built-in 32 18650 batteries, which are connected in four strings and eight in parallel, and are fixed by the battery bracket. It adopts Saiwei micro electric protection chip, and is equipped with equalization circuit, and is also equipped with a battery secondary protection chip, with Blaupunkt three-terminal fuse for overvoltage protection.
The fast charging panel is equipped with two buck-boost circuits, one for USB-C fast charging and one for DC input. The whole machine is controlled by Xinhai CS32F030 MCU, Yingjixin IP2368 is used for USB-C interface bidirectional fast charging, and SC8112 synchronous step-down converter is used for USB-A interface output. The internal PCBA modules are coated with conformal coating, which effectively avoids the influence of moisture and dust on the outdoor power supply and ensures stable and reliable application.