Charging terminal

Abstract

The utility model discloses a charging terminal. A switch assembly and a charging controller are arranged in the charging terminal, the switch assembly comprises a plurality of switch devices, the switch assembly and the charging controller are arranged in a shell, and a detection device and a load balancing controller are arranged in a charging station where the charging terminal is located. The detection device is used for detecting current detection signals of three phase lines in the charging station; the load balancing controller is used for generating a scheduling instruction based on the current detection signal; the charging controller is used for generating a switch control instruction based on the scheduling instruction; and the switch assembly is used for controlling two switch devices in the switch assembly to be closed based on the switch control instruction, so that a load to be charged is connected with two phase lines in the three phase lines, and charging is carried out. According to the charging terminal, dynamic adjustment of the power load of the double-phase line charging terminal can be achieved, the power supply capacity of a station is utilized to the maximum extent, and the installation and maintenance cost of a charging system is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of charging control, and in particular to a charging terminal. BACKGROUND

[0002] With the rapid development of the new energy industry, the popularity of new energy products (for example, electric vehicles) is also increasingly high, and the demand for energy (for example, electric energy) is also increasingly large. At present, the types of new energy products are extensive, mainly including single-phase charging equipment, two-phase charging equipment, three-phase charging equipment, and the like. Among them, for different types of energy equipment, the charging station usually needs to be equipped with corresponding charging terminals.

[0003] Two-phase charging equipment is widely used in some countries and regions, and the charging station usually needs to be configured with some two-phase charging terminals to meet the charging demand. When the two-phase charging terminal is configured, a grouping method is often used, that is, a pair of phase lines is selected for each group of charging terminals to be connected, so that the number of charging terminals connected by each phase line is in a relatively balanced state. However, when the vehicle enters the station for charging, on-site personnel usually need to be guided, and once the guidance is not timely, the problem of unbalanced load may occur, thereby there is a great safety hazard. Moreover, the above configuration method is not convenient for the installation and maintenance of the charging terminal, and the labor cost is high. CONTENT OF THE UTILITY MODEL

[0004] Therefore, an embodiment of the present application provides a charging terminal, which mainly aims to solve the technical problems that the charging terminal cannot dynamically adjust the load balance in the charging station, and the installation and maintenance of the charging terminal have high complexity and high labor cost.

[0005] According to an aspect of the present application, a charging terminal is provided, the charging terminal is provided with a switch assembly and a charging controller, the switch assembly includes a plurality of switch devices, the switch assembly and the charging controller are arranged in a shell, and a detection device and a load balance controller are arranged in a charging station where the charging terminal is located, wherein

[0006] The input end of the detection device is connected with the power grid side of three phase lines, the output end of the detection device is connected with each charging terminal in the charging station, the signal output end of the detection device is connected with the load balance controller, and the load balance controller is further connected with the charging controller of each charging terminal in the charging station;

[0007] The charging terminal includes three input ends and two output ends, the switch assembly is connected between the input end and the output end of the charging terminal, and the control end of the switch assembly is connected with the charging controller;

[0008] The detection device is configured to detect current detection signals of three phase lines in the charging station; the load balancing controller is configured to generate scheduling instructions based on the current detection signals; the charging controller is configured to generate switch control instructions based on the scheduling instructions; and the switch assembly is configured to control two switch devices in the switch assembly to be closed based on the switch control instructions, so that the load to be charged is connected to two phase lines of the three phase lines and charging is performed.

[0009] Optionally, the switch assembly includes three input ends and two output ends, and the switch assembly includes at least four switch devices, wherein the three input ends of the switch assembly are connected to the three phase lines through the detection device respectively; the two output ends of the switch assembly are connected to the three input ends of the switch assembly through a plurality of switch devices, wherein each switch device is connected in series between an input end and an output end of the switch assembly, and at least one input end of the three input ends of the switch assembly is connected to the two output ends of the switch assembly through two switch devices respectively; in the same charging period, two switch devices connected to the two output ends of the switch assembly are in a closed state, and the two closed switch devices are connected to different input ends respectively.

[0010] Optionally, the switch assembly includes four switch devices, wherein the two output ends of the switch assembly are connected to the two input ends of the switch assembly through two switch devices respectively, wherein each switch device is connected in series between an input end and an output end of the switch assembly, and one input end of the three input ends of the switch assembly is connected to the two output ends of the switch assembly through two switch devices respectively.

[0011] Optionally, the switch assembly includes five switch devices, wherein one output end of the switch assembly is connected to two input ends of the switch assembly through two switch devices respectively, and the other output end of the switch assembly is connected to three input ends of the switch assembly through three switch devices respectively, wherein each switch device is connected in series between an input end and an output end of the switch assembly.

[0012] Optionally, the switch assembly includes six switch devices, wherein the two output ends of the switch assembly are connected to the three input ends of the switch assembly through three switch devices respectively, wherein each switch device is connected in series between an input end and an output end of the switch assembly.

[0013] Optionally, the scheduling instruction further comprises a current adjustment instruction and / or a power adjustment instruction; the charging controller is further configured to charge the load to be charged based on a current value indicated in the current adjustment instruction, and / or charge the load to be charged based on a power value indicated in the power adjustment instruction.

[0014] Optionally, a sum of the to-be-allocated power of all loads connected to the same phase line in the charging station is less than the to-be-allocated power corresponding to the phase line; and a sum of the to-be-allocated power of all loads in the charging station is less than the to-be-allocated power corresponding to the charging station.

[0015] Optionally, the charging terminal further comprises a communication controller, the communication controller being connected to the charging controller, and the charging controller being in communication connection with the load balancing controller through the communication controller.

[0016] Optionally, the load balancing controller is arranged at at least one of a charging terminal, a charging station, and a cloud server; when the load balancing controller is arranged in the charging terminal, the charging controller in the charging terminal serves as the load balancing controller, and the load balancing controller is in communication connection with the communication controllers of other charging terminals in the charging station through the communication controller; and / or when the load balancing controller is arranged locally in the charging station, the load balancing controller is in communication connection with the communication controllers of the charging terminals in the charging station through a communication module; and / or when the load balancing controller is arranged in the cloud server, the load balancing controller is in communication connection with the communication controllers of the charging terminals in the charging station through a network.

[0017] Optionally, the charging terminal further comprises a current detection module, the current detection module being connected to the charging controller, and the current detection module being configured to detect an actual charging power of the charging terminal.

[0018] By the technical scheme, the charging terminal provided by the embodiment of the application can flexibly configure and efficiently switch the phase line connection mode in the charging terminal by the current detection result output by the detection device, the scheduling instruction generated by the load balancing controller with the real-time total current / power value on the three phase lines as the target, and the switching device inside the switch assembly, so as to realize dynamic distribution of the load in the charging system, and maximize the power supply capacity of the charging station, thereby improving the safety of the charging system and the utilization rate of the power energy. In addition, the charging terminal does not need to be grouped and distributed during installation, does not need to be guided by personnel during use, and is easy to detect the maintenance point during maintenance, so that the complexity of configuration, use and maintenance of the charging terminal can be effectively reduced, thereby reducing the required labor cost.

[0019] The above description is only a summary of the technical scheme of the application, in order to more clearly understand the technical means of the application, the application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings described herein are used to provide further understanding of the application, and form a part of the application. The schematic embodiments of the application and the description thereof are used to explain the application, and do not constitute an improper limitation on the application. In the drawings:

[0021] Figure 1 A structure schematic diagram of a charging terminal and a charging station provided by the prior art is shown;

[0022] Figure 2 A structure schematic diagram of a charging terminal and a charging station provided by the embodiment of the application is shown;

[0023] Figure 3 A structure schematic diagram of a switch assembly provided by the embodiment of the application is shown;

[0024] Figure 4 A structure schematic diagram of another switch assembly provided by the embodiment of the application is shown;

[0025] Figure 5 A structure schematic diagram of another switch assembly provided by the embodiment of the application is shown;

[0026] Figure 6 A topology structure schematic diagram of a charging terminal provided by the embodiment of the application is shown;

[0027] Figure 7A schematic diagram of the topology of another charging terminal provided in an embodiment of this application is shown;

[0028] Figure 8 A schematic diagram of the topology of another charging terminal provided in an embodiment of this application is shown;

[0029] Figure 9 A schematic diagram of the internal structure of a charging terminal provided in an embodiment of this application is shown. Detailed Implementation

[0030] The present application will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present application can be combined with each other.

[0031] Currently, charging stations with dozens or even hundreds of charging terminals need to limit the total current within the station for safety reasons, ensuring that the total current does not exceed a certain set threshold. If this threshold is exceeded, pre-installed electrical safety devices (such as fuses) will promptly interrupt the power supply. For some charging terminals using two-phase power supply, any two of the three phase lines in the power grid can be selected for power supply. To maximize the utilization of the charging station's power supply capacity, the load within the charging station should be evenly distributed across the three phase lines.

[0032] like Figure 1 As shown, a relatively simple connection method currently is to randomly select a pair of phase lines for each charging terminal within the charging station, ensuring a relatively balanced number of charging terminals connected to each phase line. The characteristic of this circuit connection method is that the connected phase lines are directly connected to the output terminal. The phase lines connected to each charging terminal are determined after the charging station is completed and cannot be easily changed. When multiple loads are charging simultaneously within the charging station, because the phase lines connected to the charging terminals are random, the phase lines can naturally achieve a load balance. Alternatively, the operators within the charging station can guide the loads to charge at the appropriate charging terminals based on the current load status of each phase line.

[0033] To ensure randomness, the aforementioned connection method typically requires pre-planning of the phase lines used by each connected charging terminal, resulting in complex wiring during the site construction phase. Furthermore, if a charging terminal malfunctions within the site, maintenance workers will find it difficult to locate the faulty line immediately without a site wiring diagram. Therefore, under the current circuit connection method, the site cannot handle certain extreme situations when achieving load balancing, such as when all charging vehicles are concentrated on charging terminals connected to only two specific phase lines.

[0034] To address the above problems, in one embodiment, such asFigure 2 As shown, a charging terminal 10 is provided, which is internally provided with a switch assembly 11 including a plurality of switch devices and a charging controller 12, and a detection device 20 and a load balancing controller 30 are provided in a charging station where the charging terminal 10 is located. The input end of the detection device 20 is connected with the power grid side of three phase lines, the output end of the detection device 20 is connected with each charging terminal 10 in the charging station, the signal output end of the detection device 20 is connected with the load balancing controller 30, and the load balancing controller 30 is connected with the charging controller 12 of each charging terminal 10 in the charging station. For each charging terminal 10, three input ends and two output ends are included, wherein the switch assembly 11 is connected between the input end and the output end of the charging terminal 10, and the control end of the switch assembly 11 is connected with the charging controller 12. In this embodiment, the detection device 20 can be used to detect current detection signals of the three phase lines in the charging station, and the load balancing controller 30 can be used to generate a scheduling instruction based on the current detection signals, wherein the method of generating the scheduling instruction aims to equalize or approximate the real-time total current / power values on the three phase lines. Further, the charging controller 12 inside the charging terminal 10 can be used to generate a switch control instruction based on the scheduling instruction, and the switch assembly 11 inside the charging terminal 10 can be used to control the closing of the two switch devices in the switch assembly based on the switch control instruction, so that the load to be charged is connected with two of the three phase lines, and the charging controller 12 can also be used to generate a current / power adjustment instruction based on the scheduling instruction, so that the charging terminal charges the dual-phase line load according to the calculated allocated current or power. The means of adjusting the power can be adjusting the load current, and the voltage remains basically stable and is not adjusted. In this embodiment, the switch assembly 11 and the charging controller 12 are arranged in a housing (not shown in the figure). By arranging the switch assembly 11 and the charging controller 12 in the housing, the switch assembly 11 and the charging controller 12 can be effectively protected from external environmental factors, such as dust, water, moisture, and physical impact, thereby ensuring the safety and stability of the charging process. At the same time, the integrated design also helps to simplify the installation and maintenance process of the charging terminal, thereby improving the reliability and service life of the charging terminal.

[0035] Specifically, the charging terminal 10 is internally provided with a switch assembly 11 and a charging controller 12, and the charging field station where the charging terminal 10 is located is provided with a detection device 20 and a load balancing controller 30. Among them, in the charging terminal 10, the three-phase five-wire power grid can be connected with the load through the switch assembly 11, and the switch assembly 11 can be connected with the load under the control of the charging controller 12. Two phase lines in three phase lines, thereby charging the load. In this embodiment, the charging controller 12 is also called ACM (AC Charging Control Module), which can be used to receive scheduling instructions to generate switch control instructions and current / power adjustment instructions, and can be used to communicate with the load balancing controller 30, and can be used to control guidance, charging control, safety protection and other functions. Further, outside the charging terminal 10, the charging controller 12 can be connected with the load balancing controller 30 through wired or wireless mode, and the load balancing controller 30 is connected with the detection device 20 arranged between the power grid side of three phase lines and each charging terminal 10. Among them, the load balancing controller 30 can generate scheduling instructions based on the current detection signal output by the detection device 20, and the method of generating scheduling instructions takes the real-time total current / power value of three phase lines as the target. Equal or close to equal. Then, send the scheduling instruction to the charging controller 12 inside each charging terminal 10, so that the charging controller 12 can generate switch control instructions through the scheduling instruction after the charging terminal 10 is connected with the load, and control the switch device in the switch assembly 11 to close, thereby charging the load. Further, the charging controller 12 can also generate current / power adjustment instructions through the scheduling instruction, so as to charge the load with the current / power calculated and distributed by the load balancing controller. In this embodiment, the detection device 20 can measure positive and negative currents and voltage, thereby obtaining power value for load balancing control.

[0036] In the embodiment, the load balancing controller 30 can ensure that the total current of each phase line in the charging station does not exceed the current threshold set by the charging station, and by switching the connection mode of the switch assembly 11 of each charging terminal 10, it can ensure that the load in the charging station, including non-charging load and charging load, can be evenly distributed on the three phase lines. The charging load can be an electric vehicle, and the non-charging load can be an air conditioning system, an office lighting system, etc. of the station, and the charging load and the non-charging load together constitute all electrical equipment in the charging station. The current / power of the charging load when performing charging is the same as that of the charging terminal connected thereto, and in order to facilitate expression, various currents / powers of the charging load and various currents / powers of the charging terminal will be used for scheme description at different positions. In the embodiment, the method of generating scheduling instructions by the load balancing controller 30 based on the current detection signals of the three phase lines in the charging station can be implemented by various existing algorithms, wherein the method of generating scheduling instructions aims to equalize or approximate the real-time total current / power values on the three phase lines. And the load balancing controller 30 can be arranged in at least one of the inside of the charging terminal 10, the inside of the charging station, and the cloud server, and the load balancing controller 30 can be one or multiple, which is not limited in the embodiment. The above charging terminal can solve the problems of unbalanced load in the charging station and high installation and maintenance cost of the charging terminal.

[0037] It should be noted that the circuit connection mode of each circuit module in the charging terminal and the selection of the device can be determined according to the actual situation, and the embodiment is not limited. The circuit function of the charging terminal provided in the embodiment is mainly realized through the circuit connection relationship between each circuit module, and does not depend on the program module in a certain circuit module for realization. In addition, each circuit module can be realized by an analog circuit or a digital circuit, and for the circuit module that can implant a program module, the realization of the module function can be realized by the program module provided by the prior art.

[0038] The above embodiments, by incorporating a switching assembly and a charging controller within the charging terminal, and by installing a detection device and a load balancing controller within the charging station where the charging terminal is located, can flexibly configure and efficiently switch the phase line connection methods within the charging terminal using the current detection results output by the detection device, the scheduling instructions generated by the load balancing controller with the goal of equal or nearly equal real-time total current / power values ​​on the three phase lines, and the switching devices within the switching assembly. This enables dynamic distribution of the load within the charging system and maximizes the utilization of the station's power supply capacity, thereby improving the safety of the charging system and the utilization rate of electrical energy. Furthermore, the aforementioned charging terminals do not require group power distribution during installation, nor do they require personnel guidance during use. Maintenance points are easily identifiable during repairs, effectively reducing the complexity of configuring, using, and maintaining the charging terminals, thus lowering the required labor costs.

[0039] In one embodiment, such as Figure 2 As shown, the switch assembly 11 includes three input terminals and two output terminals, and includes at least four switching devices. The three input terminals of the switch assembly 11 are connected to three phase lines via a detection device 20. Inside the switch assembly 11, the two output terminals are connected to the three input terminals via multiple switching devices. Each switching device is connected in series between one input terminal and one output terminal of the switch assembly, and at least one of the three input terminals is connected to both output terminals via two switching devices. During the same charging period, the two switching devices connected to the two output terminals of the switch assembly are in a closed state, and the two closed switching devices are connected to different input terminals.

[0040] In this embodiment, the switching assembly has three input terminals and two output terminals. The two output terminals can output three phase line combinations: L1 and L2, L1 and L3, and L2 and L3. Based on this combination, the switching assembly requires at least four switching devices to achieve the corresponding function. Each output terminal needs to be connected to at least two switching devices, and these two devices are connected to two different input terminals respectively. This connection ensures that the switching assembly 11 can connect the load to be charged to any two phase lines in the power grid during the same charging period, according to actual needs.

[0041] Specifically, the three phase lines outputted from the detection device 20 can be directly connected to each charging terminal 10 in the charging station, and the switching of different phase lines can be realized through the switching devices inside the switching assembly 11, and then the charging of the load is realized through two phase lines among the three phase lines. Specifically, when a new load (such as an electric vehicle driven by a user) enters the charging station, the user can freely choose any idle charging terminal in the station for charging. At this time, the load balancing controller 30 can plan the phase line suitable for output according to the current detection signal detected by the detection device 20 installed between each phase line and each charging terminal 10, and then send a scheduling instruction to the charging controller 12 inside the charging terminal 10 connected to the new load, so that the charging controller 12 can control the on-off of the switching devices inside the switching assembly 11, and thus realize the output of the specified phase line, thereby charging the two-phase load.

[0042] The above embodiment can realize flexible connection and switching between the load and the phase line during the charging process by arranging at least four switching devices in the switching assembly, thereby effectively improving the utilization rate of power resources. In the scenario of simultaneous charging of multiple loads, by arranging suitable phase line combinations for each charging terminal, the problem of single-phase overload can be effectively avoided, thereby ensuring the stable operation of the entire charging station. In addition, the above circuit design simplifies the installation and maintenance process of the charging terminal, and reduces the required labor cost.

[0043] In one embodiment, the switching assembly includes four switching devices, wherein two outputs of the switching assembly are connected to two inputs of the switching assembly through two switching devices respectively, each switching device is connected in series between an input and an output of the switching assembly, and one input among three inputs of the switching assembly is connected to two outputs of the switching assembly through two switching devices respectively. For example, as shown in Figure 3 The switching assembly includes four switching devices, K1, K2, K3 and K4, wherein the first ends of K1 and K2 are connected to phase line L1 and phase line L2 respectively, the second ends of K1 and K2 are connected together and then connected to one output of the switching assembly, the first ends of K3 and K4 are connected to phase line L2 and phase line L3 respectively, and the second ends of K3 and K4 are connected together and then connected to the other output of the switching assembly. Through this connection mode, the number of switching devices can be saved, and two-phase switching can be realized.

[0044] Specifically, as shown in Figure 3As shown, assuming that three electric vehicles (i.e. loads) in the station are about to start charging, the three vehicles are named as vehicle 1, vehicle 2 and vehicle 3 respectively, and the charging terminals used by the three vehicles are named as terminal 1, terminal 2 and terminal 3 respectively. When vehicle 1 is charging, terminal 1 closes switch devices K1 and K3 under the control of the load balancing controller and the charging controller, at this time, the output end of terminal 1 is connected to phase lines L1 and L2; when vehicle 2 is charging, terminal 2 closes switch devices K1 and K4 under the control of the load balancing controller and the charging controller, at this time, the output end of terminal 2 is connected to phase lines L1 and L3; when vehicle 3 is charging, terminal 3 closes switch devices K2 and K4 under the control of the load balancing controller and the charging controller, at this time, the output end of terminal 3 is connected to phase lines L2 and L3. In the above manner, dynamic adjustment of load can be achieved, the utilization rate of power resources can be improved, and the required human cost can be saved.

[0045] The switch assembly provided by the embodiment can reduce the number of switch devices, save the design cost of the circuit, and reduce the complexity of the charging terminal. In addition, the switch assembly provides a flexible phase line switching mode, which can enable the load to select two phase lines from the three phase lines for connection according to the grid state and the load demand, thereby optimizing power distribution and improving the efficiency and stability of power supply.

[0046] In one embodiment, the switch assembly includes five switch devices, wherein one output end of the switch assembly is connected to two input ends of the switch assembly through two switch devices respectively, and the other output end of the switch assembly is connected to three input ends of the switch assembly through three switch devices respectively, and each switch device is connected in series between an input end and an output end of the switch assembly. For example, as shown in Figure 4 As shown, the switch assembly includes five switch devices, namely K1, K2, K3, K4 and K5, wherein the first ends of K1, K2 and K3 are connected to phase lines L1, L2 and L3 respectively, the second ends of K1, K2 and K3 are connected together and then connected to one output end of the switch assembly, the first ends of K4 and K5 are connected to phase lines L2 and L3 respectively, and the second ends of K4 and K5 are connected together and then connected to the other output end of the switch assembly. In this connection manner, the redundancy of switch devices can be achieved, and dual-phase line switching can be achieved.

[0047] The above embodiment can provide a backup path when a certain switch device fails by designing redundant switch devices, thereby ensuring the stable operation of the charging terminal. In addition, the switch assembly provides a flexible phase line switching mode, which can enable the load to select two phase lines from the three phase lines for connection according to the grid state and the load demand, thereby optimizing power distribution and improving the efficiency and stability of power supply.

[0048] In one embodiment, the switching assembly includes six switching devices, wherein the two output terminals of the switching assembly are respectively connected to the three input terminals of the switching assembly through three switching devices, and each switching device is connected in series between one input terminal and one output terminal of the switching assembly. For example, such as Figure 5 As shown, the switching assembly includes six switching devices, namely K1, K2, K3, K4, K5, and K6. The first terminals of K1, K2, and K3 are connected to phase lines L1, L2, and L3 respectively. The second terminals of K1, K2, and K3 are connected together and then connected to one output terminal of the switching assembly. The first terminals of K4, K5, and K6 are connected to phase lines L1, L2, and L3 respectively. The second terminals of K4, K5, and K6 are connected together and then connected to the other output terminal of the switching assembly. This connection method achieves redundancy of the switching devices, allowing for two-phase line switching through various switch combinations, thereby improving the reliability and flexibility of the switching assembly.

[0049] The above embodiments, by designing redundant switching devices, can provide a backup path when a switching device fails, thereby ensuring the stable operation of the charging terminal. Furthermore, the aforementioned switching components provide a flexible phase switching method, allowing the load to select two phases from the three phases for connection based on grid conditions and load requirements, thus optimizing power distribution and improving power supply efficiency and stability.

[0050] In one embodiment, the scheduling instructions generated by the load balancing controller further include current regulation instructions and / or power regulation instructions. The charging controller can be used to charge the load to be charged based on the current value indicated in the current regulation instruction, and / or, based on the power value indicated in the power regulation instruction, charge the load to be charged. In this embodiment, the charging controller can be used to generate current / power regulation instructions based on the scheduling instructions, so that the charging terminal charges the two-phase load according to the calculated allocated current or power. The means of regulating the power can be adjusting the load current, while the voltage remains basically stable and is not regulated.

[0051] In one embodiment, the sum of the power to be allocated of all loads connected to the same phase line in the charging station is less than the power to be allocated corresponding to the phase line, and the sum of the power to be allocated of all loads in the charging station is less than the power to be allocated corresponding to the charging station.

[0052] Specifically, when allocating power to each charging terminal, the carrying capacity of each phase line needs to be considered. The sum of the to-be-allocated power of all loads connected to the same phase line should be less than the to-be-allocated power corresponding to the phase line, that is, the total power required by all loads on each phase line cannot exceed the maximum power that the phase line can provide, so as to prevent overload and safety hazards. In addition, the sum of the to-be-allocated power of all loads cannot exceed the to-be-allocated power corresponding to the charging station, so as to prevent the total power of the charging station from exceeding the maximum power that the power grid or transformer can provide, thereby ensuring the stable operation of the charging system.

[0053] The above embodiments can ensure the power balance of each phase line in the charging station and the entire charging station, improve the safety and stability of the charging process, optimize the utilization rate of power resources, avoid overload and power waste, and help reduce the load pressure of the power grid and improve energy utilization efficiency.

[0054] In one embodiment, a communication controller is further arranged in the charging terminal, wherein the communication controller is connected with the charging controller, and the charging controller can be in communication connection with the load balancing controller through the communication controller.

[0055] Specifically, the communication controller is arranged in the charging terminal, wherein the communication controller is connected with the charging controller and can be in stable communication connection with the load balancing controller in the charging station through a specific communication protocol and interface. In this embodiment, the communication controller refers to a hardware or software module specially used for data transmission and processing, which can support multiple communication modes such as Ethernet, CAN bus, wireless communication, etc. to adapt to different application scenarios and communication needs. Through cooperative work with the charging controller, the communication controller can upload key data such as the charging state, fault information, and required power of the charging terminal to the load balancing controller in real time. At the same time, it can also receive instructions from the load balancing controller, such as adjusting the charging power, starting or stopping charging, etc. to ensure that the charging process can be carried out in a predetermined manner.

[0056] This embodiment can enhance the communication capability of the charging terminal by arranging the communication controller in the charging terminal, so that the charging terminal can be in real-time communication connection with the load balancing controller, thereby realizing accurate control of the charging process and improving the safety and reliability of the charging process.

[0057] In one embodiment, the load balancing controller can be arranged at least one of the charging terminal, the charging station locally, and the cloud server. When the load balancing controller is arranged in the charging terminal, the charging controller in the charging terminal can be used by the load balancing controller, and at this time, the load balancing controller can be in communication connection with the communication controllers of other charging terminals in the charging station through the communication controller. In this scenario, the load balancing controller can be in communication connection with the communication controllers of other charging terminals in the charging station through the communication controller.Figure 6 As shown, the charging terminal provided with the load balancing controller can be referred to as a master charging terminal, and other charging terminals connected with the load balancing controller can be referred to as sub charging terminals. The load balancing controller can provide scheduling instructions for the master charging terminal and each sub charging terminal in the charging station. When the load balancing controller is set locally in the charging station, the load balancing controller can be communicatively connected with the communication controller of each charging terminal in the charging station through the communication module. In this scenario, as shown, the load balancing controller can be communicatively connected with the communication controller of each charging terminal in the charging station through the communication module. Figure 7 As shown, the charging station can not be provided with a master charging terminal, and all charging terminals connected with the load balancing controller are sub charging terminals. In this case, the load balancing controller can provide scheduling instructions for each sub charging terminal in the charging station. Further, when the load balancing controller is set in the cloud server, the load balancing controller can be communicatively connected with the communication controller of each charging terminal in the charging station through the network. In this scenario, the cloud controller can be directly communicatively connected with each charging terminal in the charging station through the network, or can be communicatively connected with the master charging terminal in the charging station, and then connected with each sub charging terminal in the charging station through the master charging terminal, so as to realize the issuance of scheduling instructions. Figure 8 As shown, the charging station can not be provided with a master charging terminal, and all charging terminals connected with the load balancing controller are sub charging terminals. In this case, the load balancing controller can provide scheduling instructions for each sub charging terminal in the charging station. Further, when the load balancing controller is set in the cloud server, the load balancing controller can be communicatively connected with the communication controller of each charging terminal in the charging station through the network. In this scenario, the cloud controller can be directly communicatively connected with each charging terminal in the charging station through the network, or can be communicatively connected with the master charging terminal in the charging station, and then connected with each sub charging terminal in the charging station through the master charging terminal, so as to realize the issuance of scheduling instructions.

[0058] Specifically, the load balancing controller can be set in the charging terminal, locally in the charging station, or in the cloud server, or can be set in multiple positions among these positions. When the load balancing controller is set in the charging terminal, the charging controller in the charging terminal can have the function of the load balancing controller. At this time, the charging controller can be used to control the switching state of each switching device in the switching assembly, as well as the current, voltage and other parameters in the charging process. At the same time, the communication controller can be used to establish a communication connection with the communication controller of other charging terminals. In this way, the master charging terminal (i.e. the charging terminal with the built-in load balancing controller) can obtain the charging state and demand power of other sub charging terminals (i.e. other charging terminals connected with the load balancing controller) in real time. Based on this information, the load balancing controller in the master charging terminal can calculate the to-be-allocated power of each charging terminal (including the master charging terminal and the sub charging terminal), and generate a corresponding scheduling instruction with the real-time total current / power value on the three phase lines being equal or close to equal as the target, and then send the scheduling instruction to each sub charging terminal through the communication controller, so as to realize the power balance in the charging station.

[0059] Further, when the load balancing controller is set locally in the charging field station, it can establish a stable communication connection with the communication controller of each charging terminal in the charging field station through the built-in communication module. In this way, the load balancing controller can obtain the charging status, demand power and other information of each charging terminal in real time, and calculate the to-be-allocated power of each charging terminal based on the information, and then generate and issue a scheduling instruction to each charging terminal. In this scenario, a specific master charging terminal can not be set in the charging field station, and all charging terminals connected with the load balancing controller can be regarded as sub-charging terminals, which can jointly accept the control of the load balancing controller. Further, when the load balancing controller is set on a cloud server, it can be connected with the communication controllers of each charging terminal in the charging field station through the network. In this way, the load balancing controller can cross geographical limits to centrally manage multiple charging field stations. In this embodiment, the cloud controller can directly communicate with each charging terminal in the charging field station, or first establish a connection with a master charging terminal in the charging field station, and then communicate with other sub-charging terminals in the charging field station through the master charging terminal.

[0060] By deploying the load balancing controller in multiple locations, the charging efficiency of the charging field station can be improved. On the one hand, the load balancing controller can respond more quickly to changes in charging demand in the charging field station, reduce the imbalance of power allocation, and improve energy utilization efficiency. On the other hand, by integrating the load balancing controller inside the charging terminal, the investment in additional hardware devices can be reduced, and the cost can be reduced.

[0061] In one embodiment, as shown in FIG. 10, the charging terminal 10 further comprises a current detection module 13. The current detection module 13 is connected with the charging controller 12, and can be used to detect the actual charging power of the charging terminal and send the detected actual charging power to the charging controller 12. Figure 9

[0062] Specifically, the charging terminal 10 further comprises a current detection module 13, which can be used to monitor the current during the charging process in real time, and based on the detected current value, calculate the actual charging power of the charging terminal using the known voltage value, and send the actual charging power to the charging controller 12. In this embodiment, the current detection module 13 can be connected with the charging controller 12 through a specific interface or bus.

[0063] By setting the current detection module inside the charging terminal, the actual charging power of the charging terminal can be monitored and fed back in real time, which helps to achieve accurate control of the charging process, thereby improving the safety and reliability of the charging control.

[0064] ​In the above various embodiments, the method for the load balancing controller to generate the scheduling instruction based on the current detection signals of the three phase lines in the charging station can be implemented by various algorithms in the prior art, and the goal is to achieve equal or close to equal real-time total current / power values on the three phase lines, that is, the current / power value ratio of the three phase lines is equal to or close to 1:1:1, wherein the load of each phase line includes both charging load and non-charging load.

[0065] The technical features of the above embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not contradict, they should be considered as falling within the scope of the present disclosure.

[0066] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A charging terminal, characterized by, The charging terminal is provided with a switch assembly and a charging controller, the switch assembly comprises a plurality of switch devices, the switch assembly and the charging controller are arranged in a shell, a detection device and a load balancing controller are arranged in a charging station where the charging terminal is located, wherein an input end of the detection device is connected with a power grid side of three phase lines, an output end of the detection device is connected with each charging terminal in the charging station, a signal output end of the detection device is connected with the load balancing controller, and the load balancing controller is further connected with the charging controller of each charging terminal in the charging station; the charging terminal comprises three input ends and two output ends, the switch assembly is connected between the input ends and the output ends of the charging terminal, and a control end of the switch assembly is connected with the charging controller; the detection device is used for detecting current detection signals of the three phase lines in the charging station, the load balancing controller is used for generating a scheduling instruction based on the current detection signals, the charging controller is used for generating a switch control instruction based on the scheduling instruction, and the switch assembly is used for controlling two switch devices in the switch assembly to be closed based on the switch control instruction, so that a load to be charged is connected with two phase lines among the three phase lines and charging is performed.

2. The charging terminal according to claim 1, characterized in that, the switch assembly comprises three input ends and two output ends, and the switch assembly comprises at least four switch devices, wherein the three input ends of the switch assembly are connected with the three phase lines through the detection device; the two output ends of the switch assembly are respectively connected with the three input ends of the switch assembly through a plurality of switch devices, wherein each switch device is connected in series between one input end and one output end of the switch assembly, and at least one input end among the three input ends of the switch assembly is respectively connected with the two output ends of the switch assembly through two switch devices; in the same charging period, two switch devices respectively connected with the two output ends of the switch assembly are in a closed state, and the two closed switch devices are respectively connected with different input ends.

3. The charging terminal according to claim 2, characterized in that, the switch assembly comprises four switch devices, wherein the two output ends of the switch assembly are respectively connected with the two input ends of the switch assembly through two switch devices, wherein each switch device is connected in series between one input end and one output end of the switch assembly, and one input end among the three input ends of the switch assembly is respectively connected with the two output ends of the switch assembly through two switch devices.

4. The charging terminal according to claim 2, characterized by the switch assembly comprises five switch devices, wherein one output end of the switch assembly is respectively connected with two input ends of the switch assembly through two switch devices, and the other output end of the switch assembly is respectively connected with three input ends of the switch assembly through three switch devices, wherein each switch device is connected in series between one input end and one output end of the switch assembly.

5. The charging terminal according to claim 2, characterized by the switch assembly comprises six switch devices, wherein Two output terminals of the switch assembly are connected with three input terminals of the switch assembly through three switch devices respectively, wherein each switch device is connected in series between an input terminal and an output terminal of the switch assembly.

6. The charging terminal according to claim 1, characterized by The scheduling instruction further comprises current regulation instruction and / or power regulation instruction; the charging controller is further configured to charge the load to be charged based on the current value indicated in the current regulation instruction, and / or charge the load to be charged based on the power value indicated in the power regulation instruction.

7. The charging terminal according to claim 6, wherein, The sum of the to-be-allocated powers of all loads connected to the same phase line in the charging station is less than the to-be-allocated power corresponding to the phase line; The sum of the to-be-allocated powers of all loads in the charging station is less than the to-be-allocated power corresponding to the charging station.

8. The charging terminal according to claim 1, characterized by The charging terminal further comprises a communication controller connected with the charging controller, and the charging controller is in communication connection with the load balancing controller through the communication controller.

9. The charging terminal according to claim 8, characterized in that, The load balancing controller is arranged at at least one of the charging terminal, the charging station locally, and the cloud server; When the load balancing controller is arranged in the charging terminal, the charging controller in the charging terminal serves as the load balancing controller, and the load balancing controller is in communication connection with the communication controllers of other charging terminals in the charging station through the communication controller; and / or, When the load balancing controller is arranged locally in the charging station, the load balancing controller is in communication connection with the communication controllers of the charging terminals in the charging station through a communication module; and / or, When the load balancing controller is arranged in the cloud server, the load balancing controller is in communication connection with the communication controllers of the charging terminals in the charging station through a network.

10. The charging terminal according to claim 1, characterized by The charging terminal further comprises a current detection module connected with the charging controller, and the current detection module is configured to detect the actual charging power of the charging terminal.

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