Split type low-power direct current charging device

Abstract

The utility model relates to the technical field of electric automobile charging equipment, in particular to a split type low-power direct current charging device. Comprising a power module, the input end of the power module is connected with the power distribution system, the output end of the power module is connected with a power distribution unit, and the output end of the power distribution unit is provided with an insulation detection unit, a relay and a data sampling module which are connected in series. The insulation detection unit, the relay and the data sampling module which are connected in series are located in the power cabinet, a main control board is further arranged in the power cabinet, the power distribution system supplies power to the main control board through an auxiliary power source, one end of the main control board is connected with the insulation detection unit, the relay and the data sampling module, and the other end of the main control board is connected with the charging terminal. According to the utility model, the split type design is adopted, so that the equipment structure is more compact, the installation and maintenance are more convenient, and the daily charging requirement of a low-power direct-current electric vehicle can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicle charging equipment, and particularly relates to a split-type low-power DC charging device. Background Technique

[0002] With the popularization of electric vehicles, the demand for charging equipment is increasing day by day. Traditional DC charging piles usually have a large power and are suitable for fast charging. However, the power module and the terminal are integrated, resulting in a large volume and complex installation of the charging terminal equipment, which is not suitable for the daily charging needs of low-power electric vehicles. Therefore, how to design a DC power supply mode suitable for low-power electric vehicles to provide safe and efficient DC charging services for low-power electric vehicles. Content of the Utility Model

[0003] The problem to be solved by the utility model: Design a DC power supply mode suitable for low-power electric vehicles to provide safe and efficient DC charging services for low-power electric vehicles.

[0004] To achieve the above object, the utility model provides the following technical solution: A split-type low-power DC charging device, including a power cabinet and a charging terminal which are separately arranged. The power distribution system provides alternating current for the power cabinet. The power cabinet includes a power module. The input end of the power module is connected to the power distribution system, the output end of the power module is connected to the power distribution unit. The output end of the power distribution unit is provided with an insulation detection unit, a relay and a data sampling module connected in series. The insulation detection unit, the relay and the data sampling module connected in series are located in the power cabinet. The power cabinet also includes a main control board. The power distribution system supplies power to the main control board through an auxiliary power supply. One end of the main control board is connected to the insulation detection unit, the relay and the data sampling module, and the other end is interconnected with the charging terminal.

[0005] Preferably, the power module includes three parallel AC / DC converters, and the DC ends of the three AC / DC converters are connected and distributed through the power distribution unit.

[0006] Preferably, there are three charging terminals, and an insulation detection unit, a relay and a data sampling module are arranged between each charging terminal and the power distribution unit.

[0007] Preferably, the power distribution unit includes a K1 relay group and a K2 relay group. The K1 relay group and the K2 relay group are respectively arranged between the DC ends of the three parallel AC / DC converters.

[0008] Preferably, the voltage provided by the power distribution system for the power cabinet is 380V, and the power is not less than 21kW.

[0009] Preferably, the output power of the AC / DC converter is 7kW.

[0010] Compared with the prior art, the utility model provides a split-type low-power DC charging device, which has the following beneficial effects: The split-type design is adopted in the utility model, making the device structure more compact, installation and maintenance more convenient, and at the same time being able to meet the daily charging needs of low-power DC electric vehicles. The device of the utility model can be provided with multiple charging terminals to meet the diverse needs of users, and has the advantages of high charging efficiency, safety and reliability, low use cost, etc., and is suitable for the charging scenarios of small electric vehicles, which is conducive to promoting the popularization and use of electric vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic structural diagram of the device of the utility model.

[0012] Figure 2 It is a circuit structure diagram of the device of the utility model.

[0013] Figure 3 It is an enlarged schematic diagram of the connection between the charging terminal and the power cabinet of the device of the utility model.

[0014] Description of the reference numerals in the drawings: 1. Power cabinet; 11. Power module; 12. Power distribution unit; 13. Insulation detection unit; 14. Relay; 15. Data sampling module; 16. Main control board; 17. Auxiliary power supply; 2. Charging terminal. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The technical solutions in the embodiments of the utility model will be described below with reference to the drawings in the embodiments of the utility model:

[0016] The technical solution adopted by the utility model to solve its technical problems is: a split-type low-power DC charging device. The solution mainly includes the following components: a power cabinet 1 and a charging terminal 2. The power cabinet 1 is the electrical energy input of the system, realizing the energy conversion of AC / DC and the dynamic distribution and scheduling of the required power; the charging terminal 2 is the carrier for interacting with customers, undertaking the charging control management of its link, including shaking hands with the vehicle BMS, order information management, charging power demand, pushing charging information, charging safety monitoring, etc.

[0017] The power distribution system provides power to the power cabinet 1, with a voltage of 380V and a power of not less than 21kW. The charging terminal 2 is supplied with DC power by the power cabinet 1, with a voltage of 200 - 1000V and a current of 0 - 66A. At the same time, the power cabinet 1 provides an auxiliary power supply 17 for the charging terminal 2. The voltage of the auxiliary power supply 17 is 12V, and the current of the auxiliary power supply 17 is 10A. The number of charging terminals 2 depends on the user's needs, and 1, 2, or 3 can be installed. The power cabinet 1 is responsible for rectification and power distribution, and the charging terminal 2 is responsible for the physical connection and authentication work with the vehicle end. The charging terminal 2 establishes a charging connection with the electric vehicle through a charging gun. After the user scans the code or swipes the card to obtain the charging permission, the charging terminal 2 sends the charging requirements to the power cabinet 1. After receiving the requirements from the charging terminal 2, the power cabinet 1 starts the charging process. After completing self-check, insulation monitoring and other processes, it outputs the corresponding voltage and current to the charging terminal 2, and charges the electric vehicle through the charging gun.

[0018] In traditional charging devices, the power module is included in the charging terminal. However, the split design of the present utility model separates the charging terminal 2 and the power module, realizing the modular design of the charging device and improving the convenience of installation and maintenance. The charging terminal 2 only plays a transfer role, effectively utilizing the space, reducing the volume of the device, and lowering the manufacturing cost. The implementation method of separating the charging terminal 2 and the power module is to set up the power cabinet 1. The power module 11 is set in the power cabinet 1. The power module 11 includes three independently designed and paralleled AC / DC converters, which can be replaced separately. Each AC / DC converter is powered by an AC220V power supply and outputs adjustable DC power of 200 - 1000V. The output power of each AC / DC converter is 7kW, and the three AC / DC converters can output up to 21kW in total. A power distribution unit 12 is set at the output end of the power module 11. The power distribution unit 12 is a series of K1 relay groups and K2 relay groups. The K1 relay group and the K2 relay group are respectively located between the three AC / DC converters to realize the connection of the output ends of the three AC / DC converters. Through the power distribution unit 12, the rectified DC power of the three AC / DC converters can be distributed to each charging terminal 2 as needed; the power distribution is realized through the combination of the K1 relay group and the K2 relay group. The three AC / DC converters correspond to three charging terminals 2. Each insulation detection unit 13, relay 14, and data sampling module 15 corresponding to each charging terminal 2 are set in the power cabinet 1 and located at the rear end of the power distribution unit 12. Among them, the insulation detection unit 13 is in Figure 1The middle one is the IMD. At the same time, the power distribution system provides an auxiliary power supply 17 for the main control board 16. The auxiliary power supply 17 and the main control board 16 are arranged in the power cabinet. The main control board 16 is connected to the insulation detection unit 13, the relay 14 and the data sampling module 15 on the one hand, and is connected to the three charging terminals 2 on the other hand to realize information interaction. The charging terminal 2 does not include devices such as the main control board 16, the insulation detection unit 13, the relay 14 and the data sampling module 15. The main control function of the system is realized in the power cabinet 1. The main control function of the system includes response processing to the requirements of the charging terminal 2, output control of the power module 11, authentication processing of the charging terminal 2, system safety protection and power distribution unit 12 and other functions. The charging terminal 2 only has the functions of interaction and transfer. Among them, the interaction is mainly through indicator lights and touch screens (or display screens), and the transfer is mainly through charging guns.

[0019] When in use, taking the three charging terminals 2 as an example, when one vehicle needs to be charged, any one of the three charging terminals 2 can be selected to connect to the vehicle. Both the K1 relay group and the K2 relay group are closed to provide a charging power of 21 kW for the vehicle, reducing the charging time of a single vehicle; when two vehicles need to be charged, select two of the charging terminals 2 to connect to the two vehicles respectively. Only one of the K1 relay group and the K2 relay group is closed, and the two vehicles share the 21 kW power; when three vehicles need to be charged, the K1 relay group and the K2 relay group are both disconnected, and the charging power of each of the three vehicles is 7 kW. The present utility model adopts a split design, making the equipment structure more compact, installation and maintenance more convenient, and at the same time being able to meet the daily charging needs of low-power DC electric vehicles. It has the advantages of high charging efficiency, safety and reliability, low usage cost, etc., is suitable for the charging scenarios of small electric vehicles, and is conducive to promoting the popularization and use of electric vehicles.

[0020] The above embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

Claims

1. A split low-power DC charging device, characterized in that: The invention comprises a power cabinet (1) and a charging terminal (2) which are arranged separately. The power distribution system provides alternating current to the power cabinet (1). The power cabinet (1) comprises a power module (11). The input end of the power module (11) is connected to the power distribution system. The output end of the power module (11) is connected to a power distribution unit (12). The output end of the power distribution unit (12) is provided with an insulation detection unit (13), a relay (14) and a data sampling module (15) which are connected in series. The insulation detection unit (13), the relay (14) and the data sampling module (15) which are connected in series are located in the power cabinet (1). The power cabinet (1) also comprises a main control board (16). The power distribution system supplies power to the main control board (16) through an auxiliary power supply (17). One end of the main control board (16) is connected to the insulation detection unit (13), the relay (14) and the data sampling module (15), and the other end is interconnected with the charging terminal (2).

2. A split low-power DC charging device as claimed in claim 1, characterized in that: The power module (11) comprises three AC / DC converters connected in parallel, and the DC ends of the three AC / DC converters are connected and distributed through a power distribution unit (12).

3. A split low-power DC charging device as claimed in claim 2, characterized in that: There are three charging terminals (2), and an insulation detection unit (13), a relay (14) and a data sampling module (15) are provided between each charging terminal (2) and the power distribution unit (12).

4. A split-type low-power DC charging device as claimed in claim 2, characterized in that: The power distribution unit (12) comprises a K1 relay group and a K2 relay group, wherein the K1 relay group and the K2 relay group are respectively arranged between the direct current ends of three parallel-connected AC / DC converters.

5. A split low-power DC charging device as claimed in claim 4, characterized in that: The power distribution system provides the power cabinet (1) with a voltage of 380V and a power of not less than 21kW.

6. A split type low power DC charging device as claimed in claim 5, characterized in that: The AC / DC converter output power is 7kW.

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