New energy vehicles, how to distinguish between alternating current and direct current?

If you want to use an asynchronous motor, you also need to use a high-power inverter to convert DC to AC, which will also produce some energy loss. The permanent magnet synchronous motor can be directly driven by direct current, so the permanent magnet synchronous motor is mostly used in economic vehicles, and the asynchronous motor is mostly used in high-performance models.

Charging stations for electric vehicles.

There are two kinds of AC piles and DC piles, AC piles provide power to electric vehicles with on-board chargers, and do not adjust the output; DC piles are given directly to the battery of electric vehicles.

For charging, the output voltage and current are adjusted according to the BMS, and the function is much more complex than that of AC piles.

AC pile, commonly known as "slow charging". A power supply device that is permanently installed outside the electric vehicle and connected to the AC grid to provide AC power to the on-board charger of the electric vehicle (i.e., the charger fixed on the electric vehicle). The AC charging pile only provides power output, has no charging function, and needs to be connected to the on-board charger to charge the electric vehicle.

It is equivalent to just playing the role of controlling the power supply. The power is mostly 7kw. The AC pile is only to provide power input to the charger of the electric vehicle, because the power of the on-board charger is not large, so the charging speed is slow, and it generally takes about 8 hours for the AC pile to be full.

The tip of the AC pile is a 7-wire plug, and at a glance it is 7 holes.

DC piles (also known as off-board chargers), commonly known as "fast charging". It is fixedly installed outside the electric vehicle, connected to the AC power grid, and can provide direct current for the off-board electric vehicle power battery.

source of the power supply device. The output of the DC charging pile is adjustable direct current, which directly charges the power battery of the electric vehicle. Because the DC charging pile adopts a three-phase four-wire system.

Power supply, can provide sufficient power, output voltage and current adjustment range is large, can achieve the requirements of fast charging. The power is mostly 40kW and 60kW, and there are higher. Therefore, the ones next to the highway are generally fast charging piles.

In general, the input end is the alternating current used in our daily life, and after the conversion and adjustment of the charging pile-related equipment, the relevant requirements of the direct current required by the new energy vehicle will be output. Such as voltage, charging current, charging time, etc.

New energy vehicles, the charger input is AC power, our country's charging pile does not have direct current, but most of the chargers can also be connected to direct current, as long as you look at the charger, the logo, whether there is DC written on it, if it is not written, it is AC voltage.

How to distinguish between alternating current and direct current in new energy vehicles In the car, the power supply is in the car, and the power supply plug of the power plug has the current and DC band number can be seen directly.

AC charging pile, also known as AC power supply device, commonly known as "slow charging", is a power supply device that is fixed outside the electric vehicle, connected to the AC power grid, and provides AC power for the on-board charger of the electric vehicle (that is, the charger fixed on the electric vehicle), which only provides power output and has no charging function.

No need to distinguish! New energy vehicles use "direct current"!

The difference between this alternating current and direct current is that one of them rushes very slowly and the other is a little faster!

Why do you distinguish it, you can use the plug provided.

Cars use direct current. The electricity of the car is generated by the engine, different from direct current, the direction of alternating current will change with time, and direct current has no periodic changes, so the alternating current is unstable, so it is necessary to input the alternating current into the car battery to become direct current. After the conversion of the car battery, the output of electricity is naturally direct current.

When the external circuit energizes the excitation winding through the brush, a magnetic field is generated, which magnetizes the claw pole into the n pole and the S pole. When the rotor rotates, the magnetic flux changes alternately in the stator winding, and according to the principle of electromagnetic induction, an alternating induced electromotive force is generated in the three-phase winding of the stator. This is how the alternator generates electricity.

The alternator is divided into two parts: stator winding and rotor winding, the three-phase stator winding is distributed on the shell according to the electric angle of 120 degrees different from each other, and the rotor winding is composed of two pole claws. When the rotor windings are connected to direct current, they are excited, and the two pole claws form the n pole and the s pole. The magnetic field lines start from the n-pole, enter the stator core through the air gap, and return to the adjacent s-pole.

Alternating current is not easy to store and can only be obtained from the grid.

DC power can be obtained from batteries or AC rectification, so it is more suitable for some places where AC power is not convenient for application.

For example, hand-held tools, mobile bicycles, trams, etc., use direct current.

The advantage of alternating current compared with direct current is that the continuous power supply is large, after all, no matter how large the battery is, there is also a large amount.

The equipment in the car can only work through direct current, and the alternating current cannot make the car run up, because most of the equipment in the car is a circuit board, and some components, such as transistors and most of the integrated chips, are DC power supply, and they must have their own static working state, that is, the DC working state, and most of the transistors must be in the DC environment to play their functions. Transistors are used in many circuits such as integrated amplification circuits, arithmetic amplification circuits, and logic circuits used in electronic circuits. The transistor has two operating points in the circuit, one is static and the other is dynamic.

Static operating points, on the other hand, can affect dynamic operating points and can directly affect the performance of integrated circuits. Whether the amplification signal is distorted or not? Therefore, the setting of the static working point is very important, and the static working point is working in the DC state, so the circuit board uses direct current for power supply.

Cars use direct current. But it comes with a small alternator, and the alternating current generated is rectified into DC to charge the battery or to light the car. The electricity generated by the car is the direct current obtained by AC rectification, and the DC battery is charged after DC regulation, so no matter how fast the generator turns, the voltage after voltage stabilization will not exceed.

Cars use direct current because alternating current cannot be stored, and the electricity on a car needs to be sent from the engine and then stored in the battery.

I think he's using alternating current. I don't know very well. In the case of direct current, its voltage is relatively high, so it should not be used by the car.

Direct current and alternating current are generally not used directly, and need to be used after conversion.

There are two kinds of charging piles for electric vehicles: AC piles and DC piles, AC piles provide power to electric vehicles with on-board chargers, and do not adjust the output; The DC pile directly charges the battery of the electric vehicle, and adjusts the output voltage and current according to the BMS, which is much more complex than the AC pile.

To put it bluntly, AC is slow charging, while DC is fast charging!

There is also an obvious difference between DC piles and AC piles, that is, DC piles are generally larger, because there are a certain number of AC-DC power modules in the charging pile, the higher the power, the more modules in it, and the larger the pile body, while the AC pile does not have these, so the volume is relatively smaller.

As said upstairs, the main reason for AC is that the generator itself generates alternating current, and it is easy to change voltage and current, so when transmitting electric energy, the loss can be greatly reduced, and the transmission advantage is large enough to overshadow his shortcomings. As for the disadvantage of AC, it is not stable enough and is easy to leak (AC can pass through the insulator through mutual inductance and coupling). From the perspective of energy use, there are many advantages of direct current, and the energy can be transmitted stably; Save on cables (only two); Safe and easy to insulate.

The disadvantage is that it is difficult to transform pressure and current, and it is easy to produce a large amount of loss in the transmission process. In real life, the vast majority of them are DC use, although it is AC, but there will be a rectifier filter circuit inside the electrical appliances to become DC, otherwise the chip inside cannot be used at all (the chip needs to be stepped, and the rotating equipment needs to change the current waveform to be used again, or the current frequency conversion changes back to AC). Only old incandescent lamps, electric stoves, and other purely heat-generating appliances can be used in disregard of AC and DC.

Does it refer to the difference between AC charging piles and DC charging piles in charging stations, if so, the differences are as follows: AC piles belong to slow charging piles (except BYD), suitable for small electric vehicle charging, the output is AC power, and it must be converted into an on-board charger.

The best way to effectively distinguish between direct current and alternating current is to look at whether he writes DC or AC, so that you can judge the accurate way.

How to distinguish between alternating current and direct current in new energy vehicles, I think that if you want to distinguish between alternating current and direct current, then you must go to professional people to let them distinguish it for you, I am really a layman who doesn't know very well.

New energy vehicles mainly rely on charging piles.

As an energy replenishment device. From the perspective of charging type, charging piles can be divided into DC charging piles and AC charging piles, and the corresponding output is direct current.

and alternating current. Electric vehicle.

It refers to a vehicle that is powered by on-board power supply and driven by a motor to drive the wheels and meets the requirements of road traffic and safety regulations. Its working principle is to rely on the battery to generate current, through the power regulator to reach the motor, drive the power transmission system, drive the car to drive.

New energy vehicles mainly rely on charging piles as energy supply devices. From the perspective of charging type, charging piles can be divided into DC charging piles and AC charging piles, and the corresponding output is DC and AC.

DC charging, which is the so-called fast charging, is a charging method that rapidly increases the power of the orange liquid electric wheel pool in a short period of time. The power of the DC charging pile is generally between 15kw and 120kw, every 15kw is a gear, when the DC charging pile starts, the built-in conversion module of the charging pile is directly used to convert the alternating current of the power grid into direct current, and charge the battery through the charging port of the electric vehicle. The charging current of the DC charging pile is large, ten times or even dozens of times the conventional charging current, and the charging speed is very fast, generally in 30 minutes, it can be filled with 80% of the power for the electric vehicle, and after that, the constant current charging is changed to constant voltage charging to protect the battery and charge the power to a fuller level.

The advantages of this method are that the charging power is large, the charging speed is fast, and it can be fully charged in about 1 hour, which is suitable for situations where the power needs to be replenished quickly in a short time. But the defects of this method are also more obvious, on the one hand, because its power is quite large, and charging the vehicle directly will cause considerable impact on the lines in the car, and long-term use will damage the lines in the car. On the other hand, in addition to the high cost, DC fast charging also has high requirements for the battery.

Because the conductive materials used inside the battery can not completely guide away this high-power current, the remaining current will cause an impact on the inside of the battery, which is easy to make the temperature of the battery increase sharply in a short period of time, and make the lithium ions inside the battery fall off, making the battery voltage unstable, which will cause damage to the battery and reduce the life of the battery.

AC charging, the so-called slow charging, is a charging method that uses charging piles to convert the alternating current of the power grid into direct current through the charging port and through the on-board charger and charge the battery. It has a smaller power, generally below 7kw. The disadvantage of AC charging is that the charging event is long, and the charging time of different brands is not the same, and it generally takes 6-8 hours to be fully charged.

Because AC charging uses constant AC power to charge, the voltage is stable and will not cause impact on the vehicle's line and the vehicle's battery, and the current requirements are not as high as the DC charging pile, and the cost is also cheaper.

Photo by Q&A) Xiaopeng Motors.

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