The charging head network has purchased Mijia vehicle portable charging and discharging gunCharging gunCompared with conventional charging onlyCharging gunDifferent, it is equipped with a discharge conversion socket, which supports the inverter output discharge of new energy vehicles, charging other new energy vehicles or providing power supply output.MijiaCharging gunThe length is 10 meters. It is an integrated gun body design, which is easy to store and use.
Mijia vehicle portable charging and discharging gun is equipped with 10A conversion socket, which supports 13A/8A two gear charging current.When equipped with discharge conversion socket, it supports 16A discharge output.stayCharging gunThe indicator light is set on it to support the charging and discharging state and direction.Charging gunWith IP55 dustproof and waterproof design, it can also be used normally in rainy days.
The Mijia car mounted portable charging and discharging gun also has undervoltage protection, overvoltage protection, overcurrent protection, overheat protection, leakage protection and CP field protection. It also supports Bluetooth connection to the Xiaomi car to automatically open the charging cover, adding a sense of ritual.Next, we will bring the disassembly of Mijia's portable charging and discharging gun to see the internal workmanship and materials.
The packaging box of Mijia portable charging and discharging gun continues its consistent simple design style, with Mijia logo, product name, selling points and the appearance of charging and discharging gun head printed on the front.
The five selling points of the product include the integration of charging and discharging, automatic identification, a total length of 10 meters, safety protection and small size.
Product related parameters and business information are printed on the side.
The products are color matching, and will be produced in January 2024.
Mijia portable charge discharge gun and accessories are stored in the storage bag, and the storage bag is placed in theXiaomi SU7The front/trunk of the car is fine, clean and beautiful.In addition, the measured length of the storage bag is about 37cm.
The width of the bag is about 44.5cm.
The thickness of the portable charging and discharging gun and accessories installed in Mijia is about 77.1mm. From the perspective of the three dimensions after being packed into the product, it will not take up too much space as a whole, and will not have too much impact on the main place of other luggage in the car.
In addition, it is measured that the overall weight of the storage bag after being loaded with Mijia portable charging and discharging gun and accessories is 3.19kg.
The internal separation design of the storage bag prevents the parts from being stacked together due to lifting, which is more clean and convenient for subsequent use.
The storage bag is equipped with Mijia portable charge discharge gun, charge converter, discharge conversion plug and instructions.The charging and discharging gun is 10 meters long, which is enough to meet the charging requirements in most scenarios.
Mijia portable charging and discharging gun adopts a three pin plug, and the pin is protected by a plastic shell.The cable is not only very long, but also very strong. The measured diameter is 11.8mm, which ensures the safety of high current charging.
The specification of the plug is 16A 250V~. In addition to the pin, the bottom is also designed with a groove contact, which is used to connect with the metal column on the charging converter. When the 8A input is realized, the temperature control protection is carried out at the input end.
The side of the plug is also designed with a snap and release button, which can firmly connect the plug with the charging converter to avoid the danger caused by looseness and falling off.
There are product parameter labels on the cable
Model: N618
Protection grade: IP55 (gun head coupling state)
Rated input/output voltage: 250V~
Rated charging current: 13A (when 8A is used with charging converter)
Rated discharge current: 16A MAX (when used with discharge conversion plug)
On the back of the label is the product working environment temperature and business information
Mijia portable charge discharge gun conforms to the ergonomic design. The two parts of the shell are respectively designed with sandblasting and bright surface technology, and the lower area of the grip is also treated with oblique texture to improve the user's grip. The overall design is full of texture.
Mijia logo is designed at the top end of the gun body.
Model N618-1 and specification MAX 16A 250V~are printed on the bottom.
The button on the top near the front end can not only realize the release function of the traditional charging gun, but also connect the portable charging and discharging gun in Mijia via BluetoothXiaomi SU7In this case, by tapping this button in advance, the charging cover of the car can be opened automatically with one key, which is simple and ritual.
The buckle at the front end of the gun head is made of metal, which has higher strength and can withstand long time use without breaking.
Mijia portable charging and discharging gun adopts the new national standard 7-hole AC gun head, which meets the national standard for multiple protection and safety, and better transmits power.Not only can it be well adapted to the newly launchedXiaomi SU7At the same time, it is compatible with new energy vehicles of mainstream brands in the market such as Tesla, Mercedes Benz, BMW, Ideal, Xiaopeng, BYD, etc.
The top of the black bright shell of the gun head is designed with a hidden arrow type indicator light. The input and reverse output arrows prompt the user. The standby power consumption of the product is about 1.47W.
With a 10A to 16A charging converter, the car owner can go out easily. Without a 16A socket, the car can also be charged through a charging converter connected to a common plug, which makes it easier to make up electricity for travel.
Mijia portable charging and discharging gun supports 3.25KW charging and 4KW discharging, and has V2V charging and intelligent identification functions, which can realize automatic switching of charging/discharging modes. It can cooperate with the discharge conversion plug and charging converter, and can make up the emergency power for other car owners on the road in case of emergency.
The bottom four ends of the discharge conversion plug row are equipped with anti-skid pads, and the central area is printed with parameter information. The model is N618-4, the rated voltage is 250V~, the maximum current is 16A, and the maximum power is 4000W. The manufacturer is also Nanjing Kuke Electronic Technology Co., Ltd.
Disassembly of Mijia 3.25/4KW portable charge discharge gun
After seeing the unpacking and display of Mijia's portable charging and discharging gun, we will take a look at the internal workmanship and materials.
First, remove the plastic decorative ring of the charging gun body. Below is the hidden fixing screw.
The other side is also fixed with screws.
Unscrew the set screw and continue disassembly.
The indicator light is equipped with a light shielding rubber sleeve.
The transparent plastic light guide column is placed in the light shielding rubber sleeve, and is provided with a sealing rubber ring.
The plug cover of the charging gun is provided with a fixing rope.
Cut off the connecting wire and take out the PCBA from the charging gun housing to continue disassembly.
List of PCBA modules inside the charging gun, and the input wire is directly connected to the PCBA module.
PCBA module is composed of multiple PCBs by welding, and wires are connected by welding.
Expose copper and add tin for wiring on the back of PCB to increase current carrying capacity.
Glue and reinforce between components.
Remove the charging gun plug housing and separate it from the PCBA module.
The pins and switches inside the plug housing are connected to the PCBA module through connectors.
Remove the insulation bracket on the back of the PCBA module.
The insulation support is made of PA6 nylon material+25% glass fiber.
The contact pin is provided with a rubber sealing ring.
In addition to the live wire, the neutral wire and the ground wire, there is also a shield wire to detect whether the 10A conversion plug is connected.
The outer diameter of the cable measured by the spiral micrometer is about 3.35mm.
The inner diameter of the cable is about 1.81mm.
A switch and a pin wiring are arranged inside the plug shell.
The switch is used to detect whether the plug is in place.
A sealing ring is arranged between the plug housing and the housing.
The shell is made of PC material.
Separate the PCBA module inside the charging gun and start the analysis.
The large PCB at the bottom is used for charging gun output control, welding safety gauge X2 capacitor, varistor, relay, voltage transformer and current transformer.
Weld the fuse and two SMD Y capacitors on the back.
The cold pressed terminal of AC input wire is welded, and the yellow safety gauge X2 capacitor is from NDF Dafu, and the specification is 0.22 μ F.
Varistor from HEL Hongzhi, model 14D681K, is used to absorb surge overvoltage.
Weld the varistor and gas discharge tube on the small plate.
Two varistors from Celtic, model SFV10D621K.
Close up of gas discharge tube.
The patch X capacitor is also welded at the bottom of the small board.
The specification of SMD fuse is 3.15A250V.
NTC thermistor is from Celtic, model 10D-5.
ZMPT107-1 current type voltage transformer is used to collect the input AC voltage and send it to the protection chip from Zeming Langxi Electronics.
ZH-CT350C precision current transformer is used for charging current detection, and is from Xi Minglang Electronics.
The relay is from Hongfa and is used to control the circuit on and off.The relay model is HF179F-W, the contact clearance is 2.4mm, the voltage of the relay coil is 5V, a group of normally open contacts, a type 3 pin position, sensitive coil.
The other relay has the same model, which is used for live line and neutral line switch control respectively.
Close up of pins connected to another PCB.
The output end is equipped with a patch fuse with the specification of 3.15A250V.
SMD Y capacitor is from NDF.
The Y capacitance of the other patch is the same.
The PCB on the top is a control board, equipped with indicators, power metering chips, operational amplifiers, Bluetooth chips and other components.
There are power supply boards on both sides of the PCB, and the back of the PCB is equipped with main control MCU, leakage protection chip, relay and other components.
The main control MCU is AT32F421K8T7 from Yateli, with built-in 120MHz main frequency Cortex-M4 CPU, built-in 64K Flash and 16K SRAM, internally integrated 12 bit ADC, and equipped with I2C, SPI, GPIO and other communication interfaces.
Close up of 8.0MHz passive clock crystal oscillator.
Fudan Micro FM2147 is a special circuit for high performance leakage protector.The internal part includes the regulated power supply, amplification circuit, comparison circuit, tripping controller and tripping drive circuit.There are decoupling coils, varistors, voltage stabilizing diodes, diodes, resistors, capacitors and other components on the periphery.
Two signal relays are HFD4 series from Hongfa, with coil voltage of 5V and chip welding.
A wireless transmitter chip is screen printed 4455.
Close up of external 13.56MHz chip crystal oscillator.
Bluetooth chip silk screen EP2T45F10E.
Close up of 24.0MHz clock crystal oscillator.
The electricity metering chip comes from Heli, model HLW8110, and is used to measure the effective value of active power, apparent power, voltage and current.
A close-up of UTC Youshun TL074G 4 operational amplifier.
One chip is screen printed with SL5G.
Close up of 10 μ H alloy inductance.
One chip silk screen U2PB1.
Close up of the indicator light used to indicate the charging and discharging status, with foam shading.
Two auxiliary power supply boards are set on both sides of the board.
The two auxiliary power boards are identical.
The front of the small board is equipped with a common mode inductor, a high-voltage filter capacitor and a transformer.
The back is equipped with rectifier bridge, power chip, optocoupler and SMD Y capacitor.
The common mode inductance adopts EE8.3 magnetic core, which is 30mH.
The rectifier bridge is from Hongyang, the model is ABS210, and the specification is 2A1000V.
High voltage filter capacitor is from Yongming.
The specification is 8.2 μ F450V.
The main control chip of switching power supply is from the chip, model PN8135, and internal integrated switch tube.
The transformer is wrapped with high-temperature tape for insulation.
SMD Y capacitor is from NDF.
Feedback optocoupler is from Guanxi, model KPC357NT, used for output voltage feedback.
The output filter capacitor specification is 680 μ F10V.
The other Guanxi KPC357NT optocoupler is used for zero crossing detection.
Close up of a pin connected to another PCB.
Take a look at all of them and have a family photo.
Disassembly summary of charging head network
The Mijia vehicle mounted portable charging and discharging gun supports the charging and discharging of new energy vehicles. By connecting the plug of the charging gun to the attached socket, you can invert the output discharge, charge other new energy vehicles, or provide AC power supply output.The charging gun is attached with a 10A adapter, which supports 13A and 8A charging currents, and the inverter discharge supports 16A currents.There is also an indicator light to indicate the working status, which is convenient and practical.
The charging head network learned through disassembly that the charging and discharging gun of Mijia has a detection and protection circuit built in the gun head, which is composed of four PCBs by welding.One of the smaller PCBs is used to weld the main control MCU, power detection chip, leakage protection chip, and indicator light for protection detection and status display during charging.
The other PCB is welded with a varistor and a gas discharge tube for overvoltage protection, and a voltage transformer is also provided. The current transformer is used for overvoltage, undervoltage and overcurrent protection. Two relays are used for charging control.The small PCB board welded on both sides is a power module for charging gun control.The surface of PCBA module is coated with three proof paint for protection, and the plug of charging gun is equipped with sealing ring, so the overall design and material are very reliable.