With the popularization of new energy vehicles, electric vehicle charging piles have become an important demand for electric vehicle users. Among them, Ev Dc charging stations for electric vehicles have attracted much attention due to their high power and fast charging characteristics. This blog post will introduce the basic working principle as well as the electrical principle of DC charging stations, bringing you an in-depth understanding of this electrical marvel that provides convenient charging for electric vehicles.

Basic Working Principle Of Ev Dc Charging Stations

The basic working principle of DC charging station is to charge the battery by loading DC voltage at both ends of the battery and charging the battery with constant high current. The functional modules of the charging pile include DC charging module, charging pile controller and touch screen.

DC Charging Module For Electric Vehicles

Dc Ev Charging module is the core component of DC charging station, responsible for providing DC power. At present, the power of a single charging module is usually 30kW, 40KW, in order to meet the high power requirements, it is necessary to work on multiple charging modules in parallel, and realize the equalization of flow of multiple modules through the CAN bus.

Ev Charging Post Controller

Ev charging pile controller plays the role of controlling and regulating the function of charging pile. It receives commands from the touch screen, including power on, power off, output voltage, output current, etc., and sends these commands to the Ev charging module through the controller.

Ev Charging Station Touch Screen

The touch screen is used as the human-machine interface to realize the start-stop control of the Ev charging pile, charging mode setting and other operations by sending commands to the controller.

Electrical Principles of Ev DC Charging Stations

The electrical part of Ev DC charging station mainly consists of primary and secondary circuits, involving key elements such as safety, control and communication.

Dc Ev Charging Station Main Circuit

The input to the main circuit is three-phase AC power, which is converted to DC power suitable for battery reception by the charging module (rectifier module) after passing through the input circuit breaker and AC smart energy meter. In addition, the main circuit is equipped with air switches, lightning protection switches and earth leakage switches for safety.

Dc Ev Charging Station Secondary Circuit

The secondary circuit includes components such as charging pile controller, card reader, display screen, DC meter and so on. The charging pile controller is responsible for communicating with the battery management system (BMS), receiving charging control commands from the BMS, and sending them to the charging module. In addition, the secondary circuit provides functions such as start-stop control, emergency stop operation, and charging status indication.

Dc Ev Charging Station Security Measures

To ensure safety, the DC charging post also adopts a number of measures. Mechanical and electronic locks are used to prevent misuse, insulation detection and drain resistors are used for safety monitoring, and fuses are used for overload protection of the output circuit.

Dc Ev Charging Station Communications and Management

DC charging station needs to be monitored and managed with the backend, the controller connects with the backend through network communication module such as WiFi or 3G/4G to realize remote monitoring and management of the charging pile.

Dc Ev Charging Station Billing Function

For the purpose of electricity billing, charging posts are installed with meters and card readers, APPs, etc. to realize multi-channel billing and settlement by users.

Conclusion

As a key facility for electric vehicle charging, DC charging station are characterized by high power and fast charging, providing electric vehicle users with a convenient and efficient charging experience. By understanding the basic working principle and electrical principle of DC charging station, we can better understand its important role in the charging process.

The basic working principle of DC charging station is to charge the battery by constant high current to realize the rise of battery voltage until it reaches the nominal value and the SoC reaches a certain level, and then turn to constant voltage and small current charging. The functional modules of the charging pile include the charging module, the charging pile controller and the touch screen. The charging module provides DC power, the charging pile controller is responsible for controlling and regulating the charging module, and the touch screen serves as a human-machine interface to realize the user's operation and settings of the charging pile.

In terms of the electrical principle, the circuit of the DC charging station includes a primary circuit and a secondary circuit. The main circuit converts three-phase AC power into DC power suitable for battery reception through the input circuit breaker and AC smart meter. To ensure safety, the main circuit is also equipped with air switches, lightning protection switches and earth leakage switches. The secondary circuit includes components such as the charging pile controller, card reader, display and DC meter, which are used to control the charging pile's functions and communicate with the battery management system.

Safety is the highest priority consideration in the design of a DC charging station. In addition to safety measures on the input side, such as air switches and earth leakage switches, charging piles are equipped with devices such as mechanical and electronic locks to prevent misuse and ensure safety. Charging piles also require insulation testing and leakage resistance monitoring to ensure the safety of the charging process.

In order to realize the management and monitoring of the charging pile, the controller is connected to the backend through a network communication module to realize remote monitoring and management. At the same time, the charging pile also has billing function, through the meter and card reader for electricity billing.

In conclusion, as an important facility for charging new energy vehicles, DC charging station provides convenient and efficient charging service for electric vehicle users through its high power and fast charging characteristics. Understanding the basic working principle and electrical principle of DC charging station helps us to better understand its role in electric vehicle charging and promote the further development and popularization of new energy vehicles.