Let's know about the DC single and double gun charging pile
The DC single and double gun charging pile refers to the device installed on the electric vehicle to charge the battery pack using the ground AC power grid and the on-board power supply,including the on-board charger,the on-board charging generator set and the driving energy recovery charging device.Insert the AC power cord with plug directly into the charging socket of the electric vehicle to charge the battery.On board charging device usually adopts contact charger or inductive charger with simple structure and convenient control.It is designed completely according to the type of vehicle battery,with strong pertinence.Off board charging equipment,i.e.ground charging equipment,mainly includes special chargers,special charging stations,general chargers,charging stations in public places,etc.It can meet various charging methods of various batteries.Generally,the off board charger has large power,volume and weight,so as to adapt to various charging methods.
In addition,according to the different energy conversion methods of electric vehicle battery charging,DC single and double gun charging posts can be divided into contact type and inductive type.With the rapid development of power electronics technology and converter control technology,as well as the maturity and popularization of high-precision controllable converter technology,the staged constant current charging mode has been basically replaced by the constant voltage current limiting charging mode with continuous changes in charging current and charging voltage.The charging process is dominated by constant voltage current limiting charging mode.The Z problem of contact charging lies in its safety and universality.In order to meet the strict safety charging standard,many measures should be taken on the circuit to ensure that the charging equipment can charge safely in various environments.Constant voltage current limiting charging and sectional constant current charging are both contact charging technologies.The new technology of induction charging for electric vehicles is developing rapidly.Inductive charger is to use the transformer principle of high-frequency AC magnetic field to induce electric energy from the primary side of the vehicle to the secondary side of the vehicle,so as to achieve the purpose of charging the battery.The advantage of inductive charging is safety,because there is no direct point contact between the charger and the vehicle.Even if the vehicle is charged in bad weather,such as rain and snow,there is no danger of electric shock.
Generally speaking,there are four kinds of leakage of DC single and double gun charging piles,namely,semiconductor component leakage,power supply leakage,capacitor leakage and filter leakage.
1.Leakage of semiconductor components
The very small current that flows when the PN junction is cut off.D-S forward bias and G-S reverse bias.The current from D to S will flow only after the conductive channel is opened.But in fact,due to the existence of free electrons,free electrons attach to SIO2 and N,resulting in leakage in D-S.
In order to reduce the interference in switching power supply,EMI filter circuit shall be provided according to national standards.Due to the EMI circuit,there is a small current to ground after the switching power supply is connected to the mains,which is called leakage.
3.Leakage of capacitor
The dielectric must not be non-conductive;When DC voltage is applied to the capacitor,the capacitor will generate leakage current.If the leakage current is too large,the capacitor will be damaged due to heating.Except for electrolytic capacitors,the leakage current of other capacitors is very small,so the insulation resistance parameter is used to represent their insulation performance,while the leakage of electrolytic capacitors is large,so the leakage current is used to represent their insulation performance(proportional to the capacity).
4.Leakage of filter
Leakage of the filter is defined as the current from the filter housing to any end of the AC incoming line under the rated AC voltage.If all ports of the filter are completely insulated from the housing,the leakage value mainly depends on the leakage of the common mode capacitor CY,that is,mainly depends on the capacity of CY.Because the leakage of the filter is related to personal safety,countries all over the world have strict standards for it.For 220V/50Hz AC power supply,the leakage of noise filter is generally required to be less than 1mA.
DC single and double gun charging pile,electric,charging pile
With the promotion of low-carbon travel,more and more electric vehicles appear in everyone's view.Not only is the sales of electric bicycles increased,but also electric buses are vigorously promoted,and electric cars are also everywhere.
The function of the DC single and double gun charging pile is similar to that of the fuel dispenser in the gas station.It can be fixed on the ground or on the wall,installed in public buildings(public buildings,shopping malls,public parking lots,etc.)and residential parking lots or charging stations,and can charge various electric vehicles according to different voltage levels.
The DC single and double gun charging pile is the auxiliary equipment of the charger,which is used for slow and fast charging of electric vehicles,providing charging interface,human-computer interface and other functions,controlling the charging of electric vehicles,realizing charging on-off,card insertion charging and other operations.
Now new energy vehicles are more and more popular and can be seen everywhere.New energy vehicles are not only economical and environmentally friendly,but also powerful.However,many citizens do not know enough about charging safety.
The function of DC single and double gun charging pile is similar to that of the fuel dispenser in the gas station.It can be fixed on the ground or wall and installed in public buildings(public buildings,shopping malls,public parking lots,etc.)
The DC single and double gun charging pile refers to the device installed on the electric vehicle to charge the battery pack using the ground AC power grid and the on-board power supply,including the on-board charger,the on-board charging generator set and the driving energy recovery charging device.