AC Charging Pile
A ac charging pile is the power supply equipment that realizes slow charging function of electric vehicles. It is equipped with active filter devices to eliminate harmonics and stabilize the power grid.
According to the current standards, AC charging piles have perfect metering and billing measures, strong communication capabilities and simple power supply functions. However, they cannot effectively suppress harmonics generated by vehicle mounted chargers.
Power
A charging pile is a physical unit that provides one or more EV charger sockets or connectors. It typically connects to a 220-240 VAC source and reduces that power to a lower DC current for EV charging. It is also referred to as a charging station or charging point. A charging pile can be found in a wide variety of locations, including public, workplace, and residential settings.
The AC charging pile is fixedly installed in some public places outside new energy electric vehicles and provides controllable single-way or three-phase AC power supply devices for the onboard charger of electric vehicle. The AC output of the charging pile is not very large, generally 3.5kW, 7kW, and 15kW. Therefore, it is mainly used for slow charging.
Generally, a charging pile is fixed on the ground or wall and installed in major public spaces, residential areas, and public electric car charging stations. The function of a charging pile is like that of fueling stations in gas stations. People can swipe a special charging card on ac charging pile the human-computer interaction interface to carry out the corresponding operations such as charging methods, charging time, and cost data printing. In addition, a charging pile can also provide metering, communication, and security protection functions. Moreover, it can be divided into AC charging pile, DC charging pile, and AC/DC integrated charging pile according to charging mode.
Voltage
EV charging piles convert grid electricity into a standardized form used to charge electric vehicles, providing a crucial infrastructure for widespread EV adoption. They also provide essential safety and security features.
There are two kinds of EV charger piles, AC and DC. The DC pile directly charges the power battery of electric vehicle and has high efficiency. It is suitable for operational charging services such as taxis, buses, logistics, and special vehicles, but the cost is much higher than that of an AC pile. The main reason is that the DC pile requires a large transformer and AC-DC conversion modules to perform its function.
The AC pile is simpler, covers a smaller area and is easy to install. It is ideal for use in public parking lots, residential districts, shopping malls and other places where electric vehicles are often parked. The AC pile is able to support up to 7kW of charging power, and it can be installed on the wall or in the ground.
The ac charging pile has multiple protection functions, including overloading, overvoltage, leakage, and overtemperature. It also features an emergency stop circuit that cuts off the AC power supply in 100ms. In addition, the ac charging pile has a built-in active protection module that monitors the voltage and temperature of the pile to ensure optimal operation.
Current
A charging pile is a device that provides AC power for an electric vehicle’s on-board charger. It can be used as a fast or slow charger. The pile can be wall-mounted or pedestal-mounted and can have a variety of additional features. These include monitoring, user authentication, payment processing, and remote management.
EV charging piles are available in AC and DC models, and they can be installed either at home or at work. They can be connected to a regular power outlet or directly to the vehicle’s charging cable. The type of pile you choose depends on the power capacity and additional features that you need.
In general, DC charging piles are more expensive than AC charging piles. They also require higher-capacity transformers and larger wiring. Because of these requirements, they are more difficult to install and operate. In addition, they require high-current protection technology and methods. Therefore, they are more suitable for new communities than old ones.
The communication between the EV and charging pile is carried out through a signal called the CP signal. This signal is transmitted through a voltage-dividing resistor connected to the car charger. The CP signal can be detected by the charging pile using a pulse-width modulation (PWM) method. The PWM frequency can be adjusted to control the current in the charging pile.
Harmonics
EV chargers are power electronics equipment that convert the grid AC power into DC power for the battery. They will generate harmonic pollution in the electricity distribution system if they are not properly monitored and controlled. This harmonic pollution can cause problems to the metering, billing, and communication systems. This is a serious problem for charging service providers, who can take steps to prevent it by carefully selecting the chargers they use and monitoring their performance.
Harmonic pollution caused by the vehicle mounted charger of electric vehicle AC charging pile is a major problem for the power Battery Storage System grid. It seriously affects the safe and stable operation of the power system. This paper takes the AC charging pile of electric vehicles as the research object, and studies its harmonic control based on the single phase active filter (APF) technology. The results show that the APF compensation and suppression circuit can effectively reduce the harmonics of the charger current on the power grid side, mainly the 5th and 7th harmonics.
The wall-mounted AC charging pile is a new type of AC EV charger that provides DC charging for electric vehicles. It integrates charging control and guidance, human-computer interaction control, power supply function, and communication and metering functions. It also has dust-proof and waterproof functions, making it suitable for both indoor and outdoor use. It can be operated by swiping cards or entering passwords, and it is easy to operate.