Flexible charging control system and control method thereof, storage medium and computer equipment

Abstract

The invention discloses a flexible charging control system and method, a storage medium and computer equipment, and relates to the technical field of charging control. The system comprises a switch assembly which is connected between a power grid and a load to be charged and comprises a plurality of phase line change-over switches; the voltage sampling circuit is connected with the output end of the switch assembly and used for detecting the output voltage of the power grid; the controller is used for sending out a control signal of the phase line change-over switch; the logic self-locking circuit is used for outputting a charging control signal when it is detected that the power grid does not output voltage and it is detected that only one of the control signals, sent by the controller, of the phase line change-over switch is effective; and the switch driving circuit is used for controlling the phase line change-over switch to be closed when the control signal and the charging control signal of only one phase line change-over switch are received, so that only one phase line is connected with a load in the same charging period. According to the system, the safety and reliability of the charging control system can be effectively improved, and the complexity of system installation is reduced.

Description

Technical Field

[0001] The present application relates to the field of charging control technology, and in particular to a flexible charging control system and a control method thereof, a storage medium and a computer device. Background Art

[0002] With the rapid development of the new energy industry, the popularity of new energy products (such as electric vehicles) is increasing, and the demand for energy (such as electricity) is also increasing. At present, after the three-phase charging network is laid, there are still a large number of electric vehicles with single-phase charging systems on the market. When these electric vehicles with one-way charging systems use charging piles with three-phase charging systems, they often have problems with unbalanced three-phase loads, causing the single-phase load of the power grid to be too heavy, the voltage output to be unstable, and even the distribution transformer to catch fire and burn.

[0003] In traditional technology, the problem of unbalanced load in the power grid is mainly solved by passive methods. Among them, the passive method refers to grouping the charging piles when installing them, and then adjusting the access phase sequence inside the charging piles to make the load power on the three phases close to achieve load balancing in the power grid. However, the passive method cannot dynamically adjust the problem of unbalanced loads. It needs to be achieved by setting a charging ban to guide users to charge at designated locations. It is difficult to achieve true balance and it is difficult to improve the utilization rate of the power grid. Moreover, special treatment is required in the power distribution during the installation of the charging piles, which increases the complexity of the construction during the installation of the charging piles. Summary of the invention

[0004] In view of this, the embodiments of the present application provide a flexible charging control system and its control method, storage medium and computer equipment, the main purpose of which is to solve the technical problems of low grid utilization, great safety hazards and high complexity of charging pile power distribution installation when charging the load of a single-phase charging system through a three-phase charging system.

[0005] According to one aspect of the present application, a flexible charging control system is provided, the system comprising:

[0006] A switch assembly, connected between the grid side and the load to be charged, comprising a plurality of phase line switching switches, each of which is connected in series between the grid side of a phase line and the load;

[0007] A voltage sampling circuit, connected to the output end of the switch assembly, for detecting the output voltage of the power grid;

[0008] A controller, used for sending a control signal of a phase line switching switch;

[0009] A logic self-locking circuit is connected to the output end of the voltage sampling circuit and the output end of the controller, and is used to output a charging control signal when it is detected that the power grid does not output voltage and only one of the control signals of the phase line switch sent by the controller is valid;

[0010] The switch driving circuit is connected to the output end of the controller and the output end of the logic self-locking circuit, and is used to control the phase line switching switch to close when only the control signal of one phase line switching switch and the charging control signal are received, so that only one phase line is connected to the load in the same charging period.

[0011] Optionally, the switch assembly includes three phase line switching switches, the first ends of the three phase line switching switches are respectively connected to three phase lines, and the second ends of the three phase line switching switches are connected together as the output end of the switch assembly and connected to the input end of the voltage sampling circuit.

[0012] Optionally, the switch assembly further includes at least one main power switch, which is connected in series between a phase line and the load and is used to control the on / off between the phase line and the load.

[0013] Optionally, the output end of the logic self-locking circuit is also connected to the input end of the controller, and the logic self-locking circuit is also used to output a charging status signal to the controller.

[0014] Optionally, the logic self-locking circuit includes a first logic self-locking circuit and a second logic self-locking circuit, wherein the input end of the first logic self-locking circuit is connected to the output end of the controller, and the output end is connected to the enable end of the second logic self-locking circuit; the first logic self-locking circuit is used to receive control signals of multiple phase line switching switches, and when it is detected that only one control signal of the phase line switching switch is valid, outputs a charging enable signal; the input end of the second logic self-locking circuit is connected to the output end of the voltage sampling circuit, the enable end is connected to the output end of the first logic self-locking circuit, and the output end is connected to the input end of the switch drive circuit; the second logic self-locking circuit is used to follow and maintain the voltage detection signal output by the voltage sampling circuit when receiving the charging enable signal to obtain the charging control signal.

[0015] Optionally, the output end of the second logic self-locking circuit includes a first output end and a second output end, the first output end is connected to the input end of the switch drive circuit, and the second output end is connected to the input end of the controller; the second logic self-locking circuit is used to output the charging control signal to the switch drive circuit, and output the charging status signal to the controller.

[0016] Optionally, the switch assembly includes a first phase line switching switch, a second phase line switching switch and a third phase line switching switch; the first logic self-locking circuit includes a first XOR gate circuit, a second XOR gate circuit, a first AND gate circuit and a second AND gate circuit, wherein the three input ends of the first XOR gate circuit are respectively connected to the first output end, the second output end and the third output end of the controller; the first XOR gate circuit is used to receive control signals of the first phase line switching switch, the second phase line switching switch and the third phase line switching switch, and output a first logic operation signal; the two input ends of the first AND gate circuit are respectively connected to the first output end and the second output end of the controller; the first AND gate circuit is used to receive the first The second AND gate circuit receives the control signal of the third phase line switching switch and the control signal of the second phase line switching switch, and outputs a second logic operation signal; the two input ends of the second AND gate circuit are respectively connected to the third output end of the controller and the output end of the first AND gate circuit; the second AND gate circuit is used to receive the control signal of the third phase line switching switch and the second logic operation signal, and output the third logic operation signal; the two input ends of the second XOR gate circuit are respectively connected to the output end of the first XOR gate circuit and the output end of the second AND gate circuit, and the output end is connected to the enable end of the second logic self-locking circuit; the second XOR gate circuit is used to receive the first logic operation signal and the third logic operation signal, and output the charging enable signal.

[0017] Optionally, the first logic self-locking circuit also includes at least one first delay circuit, wherein the first delay circuit is arranged between the output end of the controller and the input end of the first XOR gate circuit; and / or, the first delay circuit is arranged between the output end of the controller and the input end of the first AND gate circuit; and / or, the first delay circuit is arranged between the output end of the controller and the input end of the second AND gate circuit; and / or, the first delay circuit is arranged between the output end of the first XOR gate circuit and the input end of the second XOR gate circuit; and / or, the first delay circuit is arranged between the output end of the second AND gate circuit and the input end of the second XOR gate circuit.

[0018] Optionally, the second logic self-locking circuit includes a D flip-flop, wherein the data input terminal of the D flip-flop is connected to the output terminal of the voltage sampling circuit, the clock signal input terminal and the clear enable terminal are respectively connected to the output terminal of the first logic self-locking circuit, and the output terminal is connected to the input terminal of the switch drive circuit; the D flip-flop is used to follow and maintain the voltage detection signal when receiving the charging enable signal, and output the charging control signal.

[0019] Optionally, the second logic self-locking circuit also includes a third AND gate circuit and a fourth AND gate circuit, wherein the two input ends of the third AND gate circuit are respectively connected to the output end of the voltage sampling circuit and the output end of the first logic self-locking circuit, and the output end is connected to the clock signal input end of the D flip-flop; the third AND gate circuit is used to receive the voltage detection signal and the charging enable signal, and output the clock signal to the D flip-flop; the two input ends of the fourth AND gate circuit are connected to the output end of the first logic self-locking circuit, and the output end is connected to the clear enable end of the D flip-flop; the fourth AND gate circuit is used to receive the charging enable signal, and output a stop clear signal to the D flip-flop.

[0020] Optionally, the second logic self-locking circuit also includes at least one second delay circuit, wherein the second delay circuit is arranged between the output end of the first logic self-locking circuit and the input end of the third AND gate circuit, and / or the second delay circuit is arranged between the output end of the voltage sampling circuit and the input end of the third AND gate circuit, and / or the second delay circuit is arranged between the output end of the voltage sampling circuit and the data input end of the D trigger, and / or the second delay circuit is arranged between the output end of the third AND gate circuit and the clock signal input end of the D trigger, and / or the second delay circuit is arranged between the output end of the fourth AND gate circuit and the clear enable end of the D trigger.

[0021] Optionally, the delay length of the second delay circuit arranged between the output end of the fourth AND gate circuit and the clear enable end of the D flip-flop is shorter than the delay length of the second delay circuit arranged between the output end of the third AND gate circuit and the clock signal input end of the D flip-flop.

[0022] Optionally, the switch driving circuit includes multiple fifth AND gate circuits, wherein the two input ends of the fifth AND gate circuit are respectively connected to the output end of the logic self-locking circuit and the output end of the controller, and the output end of the fifth AND gate circuit is connected to the control end of the phase line switching switch; the fifth AND gate circuit is used to output a switch driving signal to the control end of the phase line switching switch when receiving the charging control signal and the control signal of the phase line switching switch, so as to close the phase line switching switch and connect the phase line where the phase line switching switch is located to the load.

[0023] Optionally, the switch driving circuit also includes at least one third delay circuit, wherein the third delay circuit is arranged between the output end of the logic self-locking circuit and the input end of the fifth AND gate circuit, and / or the third delay circuit is arranged between the output end of the controller and the input end of the fifth AND gate circuit.

[0024] Optionally, the voltage sampling circuit includes a photocoupler; the two input ends of the photocoupler are respectively connected to the neutral line of the power grid and the output end of the switch component, and the output end is connected to the input end of the logic self-locking circuit; the photocoupler is used to convert the output voltage of the power grid into a voltage detection signal of the power grid, and output it to the logic self-locking circuit.

[0025] Optionally, the photoelectric coupler is an AC photoelectric coupler or a DC photoelectric coupler; when the photoelectric coupler is the DC photoelectric coupler, the voltage sampling circuit also includes a rectifier bridge circuit and a voltage stabilizing filter circuit, wherein the two input ends of the rectifier bridge circuit are respectively connected to the neutral line of the power grid and the output end of the switch component, the output end of the rectifier bridge circuit is connected to the input end of the voltage stabilizing filter circuit, the output end of the voltage stabilizing filter circuit is connected to the two input ends of the photoelectric coupler, and the output end of the photoelectric coupler is connected to the input end of the logic self-locking circuit.

[0026] Optionally, the system also includes a cloud server, which is connected to the controller. The cloud server is used to generate a phase line switching instruction based on the power of each phase line, and send the phase line switching instruction to the controller so that the controller generates a control signal of the phase line switching switch corresponding to the phase line switching instruction.

[0027] According to another aspect of the present application, a flexible charging control method is provided, the method being applied to the flexible charging control system as claimed in claim 1, the method comprising:

[0028] Responding to load charging instructions, obtaining real-time power data of each phase line on the grid side;

[0029] Determine a phase line switching strategy according to the real-time power data of each phase line on the grid side, and generate a control signal of a phase line switching switch according to the phase line switching strategy;

[0030] The control signal of the phase line switching switch is sent to the logic self-locking circuit and the switch driving circuit, so that the logic self-locking circuit and the switch driving circuit control the closing of the phase line switching switch according to the control signal of the phase line switching switch, so that only one phase line is connected to the load in the same charging period.

[0031] Optionally, the method also includes: receiving a charging status signal output by the logic self-locking circuit; in the charging state, if the charging status signal is detected to be an invalid signal, setting the control signals of all phase line switching switches to invalid signals to cut off the connection between all phase lines and the load; in the idle state, if the charging status signal is detected to be a valid signal, setting the control signals of all phase line switching switches to invalid signals to cut off the connection between all phase lines and the load.

[0032] Optionally, the method also includes: detecting a charging mode of the flexible charging control system, wherein the charging mode includes a single-phase charging mode and a multi-phase charging mode; in the charging state, if the single-phase charging mode is detected, controlling a phase line switching switch in the switch assembly to close so that only one phase line is connected to the load in the same charging period; in the charging state, if the multi-phase charging mode is detected, controlling multiple main power switches in the switch assembly to close so that multiple phase lines are connected to the load in the same charging period.

[0033] Optionally, the method also includes: receiving a phase line switching instruction sent by a cloud controller, wherein the phase line switching instruction is generated by the cloud controller based on real-time power data of each phase line on the grid side; generating a control signal of the phase line switching switch according to the phase line switching instruction, and sending the control signal of the phase line switching switch to the logic self-locking circuit and the switch driving circuit, so that the logic self-locking circuit and the switch driving circuit control the phase line switching switch to close according to the control signal of the phase line switching switch, and ensure that only one phase line is connected to the load during the same charging period.

[0034] Optionally, the method also includes: real-time monitoring of operating data on the grid side, wherein the operating data includes status data of the phase line switching switch, voltage data and current data on the grid side; judging whether an operating fault occurs on the grid side based on the operating data on the grid side, wherein the operating fault includes at least one of abnormal grid voltage, overcurrent fault and short circuit fault; when an operating fault is detected on the grid side, setting the control signals of all phase line switching switches to invalid signals to cut off the connection between the phase line and the load.

[0035] According to another aspect of the present application, a storage medium is provided, on which a computer program is stored, and when the program is executed by a controller, the above-mentioned flexible charging control method is implemented.

[0036] According to another aspect of the present application, a computer device is provided, including a storage medium, a controller, and a computer program stored on the storage medium and executable on the controller, wherein the controller implements the above-mentioned flexible charging control method when executing the program.

[0037] By means of the above technical solution, a flexible charging control system and its control method, storage medium and computer equipment provided by the embodiment of the present application, by setting a switch component, a voltage sampling circuit, a logic self-locking circuit, a controller and a switch driving circuit in the flexible charging control system, and cooperating with each other through various circuit modules, any phase line can be switched to connect with the load according to the load situation in the power grid, and only one phase line is connected to the load in the same charging period, so that the load in the charging network can be dynamically adjusted, the utilization rate of the power grid is improved, the safety hazards of the system are reduced, and the reliability and safety of the system are improved. Through the hardware interlocking solution, the risk of safety accidents in the case of short circuit of the switch device and failure of the software system is avoided, and the reliability of stable operation of the system is improved. And directly using voltage sampling as the self-locking control signal avoids using the feedback signal of the switch device, reduces the high reliability requirements of the switch device, improves the safety and reliability of the system, and reduces the cost of the device. In addition, the above system only needs one set of switch components to realize phase line switching, reduces the complexity of the system and the difficulty of power distribution installation, reduces the cost of the system, and improves the safety and reliability of the system. Based on this, the above-mentioned flexible charging control system can effectively reduce the charging risk caused by the unbalanced load of the charging network, enable the power distribution system of the charging pile to achieve flexible power control, and reduce the complexity of the system power distribution installation.

[0038] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0040] Figure 1 A schematic diagram of the circuit structure of a flexible charging control system provided by the prior art is shown;

[0041] Figure 2 A schematic diagram of the structure of a flexible charging control system provided in an embodiment of the present application is shown;

[0042] Figure 3A schematic diagram of the structure of a flexible charging control system provided in an embodiment of the present application is shown;

[0043] Figure 4 A schematic diagram of the structure of a flexible charging control system provided in an embodiment of the present application is shown;

[0044] Figure 5 A schematic diagram of the structure of a flexible charging control system provided in an embodiment of the present application is shown;

[0045] Figure 6 A schematic diagram of the circuit structure of a first self-locking circuit provided in an embodiment of the present application is shown;

[0046] Figure 7 A schematic diagram of the circuit structure of a second self-locking circuit provided in an embodiment of the present application is shown;

[0047] Figure 8 A schematic diagram of the circuit structure of a switch driving circuit provided in an embodiment of the present application is shown;

[0048] Fig. 9 A schematic diagram of the circuit structure of a voltage sampling circuit provided in an embodiment of the present application is shown;

[0049] Fig.10 A circuit structure schematic diagram of another voltage sampling circuit provided in an embodiment of the present application is shown;

[0050] Fig.11 A schematic diagram of the structure of another flexible charging control system provided in an embodiment of the present application is shown;

[0051] Fig.12 A flow chart of a flexible charging control method provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0052] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0053] Reference Figure 1 , provides a system structure diagram of a charging control system that uses a passive solution to solve the imbalance of grid load in traditional technology. Figure 1As shown in the figure, by arranging the charging piles in groups during the construction of the charging station, the load can be adjusted through different grid configuration methods. For example, the charging piles of the three groups in the figure are all powered by the line where the K2 switch is located to supply power to the single-phase load. The lines of the three groups are respectively connected to the three phase lines of L1, L2 and L3. When the load power connected to the charging piles of the three groups is basically the same, the phase balance of the load is achieved. To achieve basically the same load power for the three groups, it is necessary to guide the new vehicles to the group with lower load power for balancing at different times. Therefore, this passive load balancing solution needs to be grouped according to the configuration of the power grid during the installation process, and the capacity of each group needs to be carefully calculated and allocated, thereby increasing the complexity of the distribution system. In addition, there is still a problem of excessive single-phase load during the actual operation of the charging station, and it is necessary to guide users to choose charging piles under unbalanced conditions, which increases the complexity of system use. In addition, the unbalanced power distribution requires the power grid system to reserve sufficient power grid capacity for protection in order to take into account safety, which will cause the power grid capacity of the power station to be unable to be fully utilized, resulting in low power grid capacity utilization.

[0054] In response to the above problems, each embodiment of the present application will adopt an active load balancing solution to achieve efficient load balancing, thereby realizing flexible charging of the charging network, thereby improving the operating efficiency of the charging station, reducing the operating cost of the charging station, and improving the utilization rate of the power grid capacity. At the same time, each embodiment of the present application designs a hardware self-locking logic control circuit and uses a hardware self-locking method to realize the switching of the switch device, which can improve the reliability of the switching of the switch component and avoid short-circuit failures caused by software failures or failures of the switch device. In addition, the active balancing solution provided by the present application only requires one set of switch components to control flexible charging, which reduces the complexity of system design and reduces product costs.

[0055] In one embodiment, Figure 2As shown, a flexible charging control system is provided, and the flexible charging control system includes: a switch assembly 10, connected between the grid side and the load to be charged, including a plurality of phase line switching switches, each phase line switching switch is connected in series between the grid side and the load of a phase line; a voltage sampling circuit 20, connected to the output end of the switch assembly 10, for detecting the output voltage of the grid; a controller 30, for issuing a control signal of the phase line switching switch; a logic self-locking circuit 40, connected to the output end of the voltage sampling circuit 20 and the output end of the controller 30, for outputting a charging control signal when it is detected that the grid does not output voltage and only one of the control signals of the phase line switching switch issued by the controller 30 is valid; a switch driving circuit 50, connected to the output end of the controller 30 and the output end of the logic self-locking circuit 40, for controlling the phase line switching switch to close when only the control signal and the charging control signal of one phase line switching switch are received, so that only one phase line is connected to the load in the same charging period. In this embodiment, the voltage sampling circuit 20 can detect the phase voltage or line voltage output by the power grid, and output a charging control signal when it detects that the power grid does not output the phase voltage or line voltage and only one of the control signals of the phase-line switching switch issued by the controller 30 is valid.

[0056] Specifically, the switch assembly 10 is arranged between the grid side and the load to be charged, and each phase line switch inside it is connected in series on a phase line, so as to realize the independent control function of the corresponding phase line. The voltage sampling circuit 20 is connected between the output end of the switch assembly 10 and the logic self-locking circuit 40, and can be used to monitor the voltage of the grid output in real time, and output the voltage detection result to the logic self-locking circuit 40. The controller 30 is connected with the logic self-locking circuit 40 and the switch driving circuit 50, and can be used to send a control signal of the phase line switching switch to the logic self-locking circuit 40 and the switch driving circuit 50 according to the preset logic, so as to control the switching state of the phase line switching switch through the logic self-locking circuit 40 and the switch driving circuit 50. The logic self-locking circuit 40 is connected between the voltage sampling circuit 20 and the controller 30, and can be used to detect whether the grid has voltage output through the voltage sampling circuit 20. When it is detected that the grid has no voltage output and the controller 30 only outputs a valid phase line switching switch control signal, the logic self-locking circuit 40 will output a charging control signal to the switch driving circuit 50. Finally, the switch driving circuit 50 can control a phase line switch to close according to the received control signal of the phase line switch and the charging control signal, so as to ensure that only one phase line is connected to the load in the same charging period, thereby realizing flexible charging control of the power grid. It can be understood that this embodiment is aimed at a load charged by a single-phase line. In this scenario, after the load is connected to the corresponding charging pile, the flexible charging control system inside the charging pile can ensure that only one phase line is connected to the load in the same charging period, thereby ensuring the safety and stability of the load charging.

[0057] This embodiment, by setting a logic self-locking circuit in the flexible charging control system, can avoid the risk of safety accidents when the switch device is short-circuited or the software system fails and the charging state changes unpredictably, thereby improving the reliability of the stable operation of the system. At the same time, by using the voltage sampling signal of the power grid as the control signal of the logic self-locking circuit, it is possible to avoid using the feedback signal of the switch device as the control signal, thereby reducing the high reliability requirements for the switch device, further improving the safety and reliability of the system, and reducing the cost of the device.

[0058] The flexible charging control system provided in the embodiment of the present application can switch any phase line to connect with the load according to the load conditions in the power grid, and only one phase line is connected to the load during the same charging period, so as to realize dynamic adjustment of the load in the charging network, reduce the potential safety hazards of the system, and improve the reliability and safety of the system. In addition, the above-mentioned flexible charging control system only needs one set of switch components to realize phase line switching, which reduces the complexity of the system and the difficulty of power distribution installation, reduces the cost of the system, and improves the safety and reliability of the system. Based on this, the above-mentioned flexible charging control system can effectively reduce the charging risk caused by the unbalanced load of the charging network, so that the power distribution system of the charging pile can realize flexible control of power, and can reduce the complexity of the system power distribution installation.

[0059] In one embodiment, Figure 3 As shown, the switch assembly 10 includes three phase line switching switches K2, K5 and K6, the first ends of the three phase line switching switches K2, K5 and K6 are respectively connected to the three phase lines L1, L2 and L3, and the second ends of the three phase line switching switches K2, K5 and K6 are connected together and connected to L1 as the output end of the switch assembly 10 and connected to the input end of the voltage sampling circuit 20.

[0060] Specifically, in this embodiment, the three phase line switching switches K2, K5 and K6 are respectively connected to the three phase lines in the power grid. Among them, the first ends of the three phase line switching switches are directly connected to the corresponding phase lines, and the second ends are connected together to form a common output end connected to the input end of the voltage sampling circuit 20, so that the voltage sampling circuit can detect the voltage condition of the L1 phase line after the power grid passes through the switch component in real time. The above-mentioned switch component only needs to use a set of switches to achieve flexible control of multiple phase lines, which simplifies the system structure and reduces costs. At the same time, due to the accurate control of the phase line switching switch, the system can operate more safely and reliably, avoiding the risk of failure caused by complex control logic or too many hardware components.

[0061] This embodiment uses a switch assembly including three phase line switching switches to achieve flexible control of multiple phase lines on the grid side. This not only reduces the complexity of the system, the number of hardware components and circuit costs, but also improves the safety and reliability of the system by simplifying the control logic. In addition, through real-time monitoring of the voltage sampling circuit, the system can promptly detect and respond to changes in the grid side voltage, further improving the response speed and stability of the system.

[0062] In one embodiment, Figure 3 As shown, the switch assembly 10 also includes at least one main power switch K1, K2, K3 and K4. The main power switch is connected in series between the N line or a phase line and the load, and is used to control the on and off between the N line or a phase line and the load, and can determine the on and off of the single-phase load or three-phase load power supply. The main power switch K2 is connected in series between the phase line L1 and the load to determine the on and off of L1 during the power supply process, and also acts as a phase line switching switch, and is controlled together with K5 and K6 to select one to connect to achieve phase balance control. The main power switch K1 is connected in series between the N line and the load, and is used to control the on and off between the N line and the load. The main power switch K3 is connected in series between the phase line L2 and the load, and is used to control the on and off between the phase line L2 and the load; the main power switch K4 is connected in series between the phase line L3 and the load, and is used to control the on and off between the phase line L3 and the load.

[0063] Specifically, the switch assembly also includes at least one main power switch, such as Figure 3 K3 and K4 in. Among them, the main power switch is connected in series between a phase line and the load, and its main function is to independently control the on-off between each phase line and the load, so as to achieve accurate control of the output on the grid side. In this embodiment, some switches in the switch assembly can have dual functions, which can be used as a phase line switching switch to participate in the switching control of the phase line, and can also be used as a main power switch to directly control the connection state of a phase line and the load. This design not only reduces hardware redundancy, but also improves the flexibility and control efficiency of the system.

[0064] In this embodiment, the phase line switching switch can be used to switch the phase line between the grid side and the load to achieve flexible distribution of electric energy; and the main power switch controls whether the line for transmitting electric energy from the grid side to the load is connected. When there is no need to adjust the load, the main power switch can be directly controlled to charge the single-phase or three-phase load. When the load needs to be evenly adjusted, the phase line switching switch can be selectively controlled to achieve conduction between the load and different phase lines. For example, the load is only charged when L1, L2 or L3 is turned on. The combined use of the two allows the system to flexibly adjust the charging strategy according to different charging needs and grid conditions, thereby improving charging efficiency and system control flexibility.

[0065] This embodiment can effectively improve the flexibility and applicability of the flexible charging control system by combining the dual functions of the phase line switching switch and the main power switch in the switch assembly. The independent control capability of the main power switch allows the system to freely switch the working mode of the charging pile as needed, and can flexibly respond to both single-phase charging and multi-phase charging, thereby meeting the charging needs in different scenarios. In addition, the shared design of the phase line switching switch and the main power switch can also reduce the waste of hardware resources and reduce the hardware cost of the system.

[0066] In one embodiment, Figure 4 As shown, the output end of the logic self-locking circuit 40 is also connected to the input end of the controller 30 , wherein the logic self-locking circuit 40 is also used to output a charging state signal to the controller 30 .

[0067] Specifically, the output end of the logic self-locking circuit can not only be connected to the input end of the switch drive circuit, and used to output the charging control signal to the switch drive circuit under specific conditions, but also be connected to the input end of the controller, and used to output the charging status signal to the controller. Among them, the charging status signal represents a comprehensive signal generated by the logic self-locking circuit according to the voltage sampling result, the control signal sent by the controller, and the circuit processing logic. The signal reflects whether the current charging system is in a safe and effective charging state, that is, whether it is in a state where the power grid has no output voltage and only one of the control signals of the three phase line switching switches is valid. By sending the charging status signal to the controller, the controller can accurately control the charging process in combination with its own control logic. For example, when the controller receives an invalid charging status signal in the charging state, or receives a valid charging status signal in the stop state, the protection mechanism can be triggered, such as disconnecting all phase line switching switches in the switch assembly, so as to avoid the occurrence of safety accidents.

[0068] This embodiment connects the output end of the logic self-locking circuit with the input end of the controller to achieve real-time feedback and closed-loop control of the charging status signal, thereby improving the accuracy of phase line switching switch control, enabling the controller to respond to external factors such as grid voltage changes and load status adjustments more promptly and accurately, and ensuring the safety and stability of the charging process.

[0069] In one embodiment, Figure 5As shown, the logic self-locking circuit 40 includes a first logic self-locking circuit 41 and a second logic self-locking circuit 42. The input end of the first logic self-locking circuit 41 is connected to the output end of the controller 30, and the output end is connected to the enable end of the second logic self-locking circuit 42. The first logic self-locking circuit 41 can be used to receive control signals of multiple phase line switching switches, and when it is detected that only the control signal of one phase line switching switch is valid, it outputs a charging enable signal to the second logic self-locking circuit 42. The input end of the second logic self-locking circuit 42 is connected to the output end of the voltage sampling circuit 20, the enable end is connected to the output end of the first logic self-locking circuit 41, and the output end is connected to the input end of the switch driving circuit 50 and the input end of the controller 30. The second logic self-locking circuit 42 can be used to follow and maintain the voltage detection signal output by the voltage sampling circuit 20 when receiving the charging enable signal to obtain a charging control signal. In this embodiment, the voltage detection signal output by the voltage sampling circuit 20 is a phase voltage detection signal or a line voltage detection signal.

[0070] Specifically, the first logic self-locking circuit serves as a pre-stage logic judgment unit, and its input end is directly connected to the output end of the controller, and can be used to receive control signals of multiple phase line switching switches issued by the controller. When it is detected that the control signal of only one phase line switching switch is valid, the first logic self-locking circuit will output a charging enable signal to the enable end of the second logic self-locking circuit, so as to ensure that at any time, only one phase line is connected to the load, thereby effectively avoiding safety problems such as overload and short circuit caused by the simultaneous connection of multiple phase lines. Further, the second logic self-locking circuit serves as a post-stage execution and protection unit, and its input end is connected to the output end of the voltage sampling circuit, and is used to receive a real-time detection signal of the grid side voltage. At the same time, its enable end receives a charging enable signal from the first logic self-locking circuit. Under the action of the charging enable signal, the second logic self-locking circuit will follow and maintain the voltage detection signal, and finally generate a charging control signal to output to the switch drive circuit, so as to ensure that only when there is no voltage output on the grid side and the charging conditions are met, the corresponding phase line switching switch will be driven to close, thereby improving the safety and stability of the system.

[0071] This embodiment effectively improves the safety and stability of the flexible charging control system, avoids the safety problems that may be caused by connecting multiple phase lines to the load at the same time, and ensures that the system can operate stably at any time. Moreover, by using the voltage detection signal as the self-locking control signal source, the dependence on the reliability of the switching device is effectively reduced, further improving the overall safety of the system.

[0072] In one embodiment, Figure 5As shown, the output end of the second logic self-locking circuit 42 includes a first output end and a second output end. The first output end of the second logic self-locking circuit 42 is connected to the input end of the switch driving circuit 50, and the second output end of the second logic self-locking circuit 42 is connected to the input end of the controller 30. In this embodiment, the second logic self-locking circuit 42 can be used to output a charging control signal to the switch driving circuit 50, and output a charging state signal to the controller 30.

[0073] Specifically, the second logic self-locking circuit has two independent output terminals, namely, a first output terminal and a second output terminal. Among them, the first output terminal of the second logic self-locking circuit is connected to the input terminal of the switch driving circuit, which can be used to output the charging control signal, and is used to control the operation of the switch driving circuit, and then control the on and off of the phase line switching switch, so as to achieve accurate control of the charging process. The second output terminal of the second logic self-locking circuit is connected to the input terminal of the controller, and can be used to output the charging state signal, wherein the charging state signal is a comprehensive signal generated by the second logic self-locking circuit according to the voltage detection signal, the charging enable signal and the internal logic judgment, which reflects whether the control signal of the phase line switching switch issued by the controller of the current charging system is correct, whether the charging system is in a safe and effective charging state, that is, whether it is in a state where there is no output voltage of the power grid and only one of the control signals of the three phase line switching switches is valid. By receiving the charging state signal, the controller can understand the operation of the charging system in real time and make corresponding control adjustments as needed. In this embodiment, the two output terminals of the second logic self-locking circuit are independent and do not interfere with each other. This design ensures the stability and accuracy of the charging control signal and the charging status signal, and avoids malfunction or failure caused by incorrect configuration of the control signal of the phase line switch of the controller.

[0074] In one embodiment, the switch assembly includes a first phase line switch, a second phase line switch and a third phase line switch. Figure 3 , the switch assembly 10 may include three phase line switches K2, K5 and K6. Further, referring to Figure 6, the first logic self-locking circuit includes a first XOR gate circuit U2, a second XOR gate circuit U4, a first AND gate circuit U3A and a second AND gate circuit U3B. Among them, the three input ends of the first XOR gate circuit U2 are respectively connected to the first output end, the second output end and the third output end of the controller, and the first XOR gate circuit U2 can be used to receive the control signals MCU_RLY2_CTR, MCU_RLY6_CTR and MCU_RLY5_CTR of the first phase line switch, the second phase line switch and the third phase line switch, and output the first logic operation signal. The two input ends of the first AND gate circuit U3A are respectively connected to the first output end and the second output end of the controller, and the first AND gate circuit U3A can be used to receive the control signals MCU_RLY2_CTR and MCU_RLY6_CTR of the first phase line switch and the second phase line switch, and output the second logic operation signal. The two input ends of the second AND gate circuit U3B are respectively connected to the third output end of the controller and the output end of the first AND gate circuit U3A. The second AND gate circuit U3B can be used to receive the control signal MCU_RLY5_CTR of the third phase line switch and the second logic operation signal, and output the third logic operation signal. The two input ends of the second XOR gate circuit U4 are respectively connected to the output end of the first XOR gate circuit U2 and the output end of the second AND gate circuit U3B, and the output end is connected to the enable end of the second logic self-locking circuit. The second XOR gate circuit U4 can be used to receive the first logic operation signal and the third logic operation signal, and output the charging enable signal MCU_CTR.

[0075] Specifically, the three input terminals of the first XOR gate circuit U2 receive the control signals (MCU_RLY2_CTR, MCU_RLY6_CTR, MCU_RLY5_CTR) of the three phase line switching switches respectively sent from the first, second and third output terminals of the controller. Among them, the characteristics of the XOR gate circuit make the output signal valid when there are an odd number of valid signals in the input signal. In order to achieve the purpose of outputting a valid signal only when only one of the three input signals is valid, the first logic self-locking circuit is also provided with a first AND gate circuit U3A, a second AND gate circuit U3B and a second XOR gate circuit U4, and these logic circuits are combined with the first XOR gate circuit U2 for use, so as to achieve the function of outputting the charging enable signal MCU_CTR only when only one of the control signals of the three switching switches is valid.

[0076] This embodiment can realize accurate control of multiple phase line switching switches by combining an XOR gate circuit and an AND gate circuit in the first logic self-locking circuit. The above circuit can output a charging enable signal only when the control signal of only one phase line switching switch is valid, thereby effectively avoiding safety issues caused by multiple phase lines being connected to the load at the same time. In addition, the above circuit can effectively reduce the complexity and design difficulty of the circuit by decomposing complex logical operations into simple logical operation units, thereby helping to reduce circuit costs and improve system stability.

[0077] In one embodiment, Figure 6 As shown, the first logic self-locking circuit also includes at least one first delay circuit. The first delay circuit can be set at at least one of the following positions: between the output end of the controller and the input end of the first XOR gate circuit U2; and / or, between the output end of the controller and the input end of the first AND gate circuit U3A; and / or, between the output end of the controller and the input end of the second AND gate circuit U3B; and / or, between the output end of the first XOR gate circuit U2 and the input end of the second XOR gate circuit U4; and / or, between the output end of the second AND gate circuit U3B and the input end of the second XOR gate circuit U4.

[0078] Specifically, the first delay circuit may include devices such as resistors and capacitors. Among them, the number, connection method and specification attributes of resistors and capacitors can be designed according to the actual function of the circuit, and are not specifically limited here. It is understandable that the delay duration of the first delay circuit can be obtained by setting the resistance value and / or the capacitance value of the capacitor in the circuit, and testing the delay condition of the circuit. In this embodiment, the first delay circuit can be flexibly arranged on multiple critical paths of the first logic self-locking circuit. For example, the first delay circuit can be symmetrically arranged between multiple input terminals and multiple output terminals of every two logic devices, so as to improve the consistency of the signal and enhance the reliability and safety of the system.

[0079] This embodiment can effectively improve the reliability and safety of the system by introducing the first delay circuit into the first logic self-locking circuit. The design of the delay circuit can provide the necessary response time for the logic device and reduce the risk of malfunction caused by transient voltage spikes or other unstable conditions. At the same time, by setting the delay circuit on different paths and adjusting its delay time, the synchronization of the signal can be improved, thereby enhancing the stability and consistency of the system.

[0080] In one embodiment, as a supplement to the above-mentioned first logic self-locking circuit embodiment, as Figure 6As shown, the truth table of each logic device in the first self-locking circuit is shown in Table 1. Among them, the output of the first XOR gate circuit U2 and the second XOR gate circuit U4 is true (1) only when there are an odd number of true (1) values ​​in the input, and the output of the first AND gate circuit U3A and the second AND gate circuit U3B is true (1) only when all the inputs are true (1).

[0081] Table 1

[0082] MUC_RLY2_CTR MUC_RLY6_CTR MUC_RLY5_CTR U2 U3A U3B U4 0 0 0 0 0 0 0 0 0 1 1 0 0 1 0 1 0 1 0 0 1 0 1 1 0 0 0 0 1 0 0 1 0 0 1 1 0 1 0 0 0 0 1 1 0 0 1 0 0 1 1 1 1 1 1 0

[0083] It can be seen from the above table that the first self-locking circuit outputs the charging enable signal MCU_CTR (effective value is 1) only when only one of the control signals MCU_RLY2_CTR, MCU_RLY6_CTR, and MCU_RLY5_CTR of the three phase line switching switches is valid (value is 1). This ensures that the charging enable signal is output only when only one of the control signals of the three phase line switching switches is valid, so that only one phase line is connected to the load during the same charging period, avoiding the safety accident of short circuit caused by accidental connection of two phase lines to the load, thereby improving the safety of the charging control system.

[0084] In one embodiment, Figure 7 As shown, the second logic self-locking circuit includes a D flip-flop U5. Among them, the data input terminal D of the D flip-flop is connected to the output terminal of the voltage sampling circuit, the clock signal input terminal CLK and the clear enable terminal / CLR are respectively connected to the output terminal of the first logic self-locking circuit, the output terminal Q is connected to the input terminal of the switch drive circuit, and the output terminal / Q is connected to the input terminal of the controller. In this embodiment, the D flip-flop U5 can be used to follow and maintain the voltage detection signal L1_OUT_STATUS when receiving the charging enable signal MCU_CTR, and output the charging control signal RLY_ON_ALLOW and the charging status signal ALLOW_FB, and the charging control signal is opposite to the charging status signal. The charging control signal RLY_ON_ALLOW is used to indicate whether the switch driving circuit closes the switch, and the charging status signal ALLOW_FB is used to feedback the charging control status at this time to the controller. The controller verifies whether the charging system is being correctly controlled through the returned control status, thereby improving the system safety.

[0085] Specifically, the second logic self-locking circuit can use a D flip-flop U5 as the core logic control element. Among them, the data input terminal D of the D flip-flop U5 is connected to the output terminal of the voltage sampling circuit, and is used to receive the voltage detection signal L1_OUT_STATUS. In this way, the voltage detection signal can be directly used as the control signal of the second logic self-locking circuit, instead of using the feedback signal of the switching device as the control signal, ensuring that the charging control signal is output only when there is no output voltage of the power grid, thereby reducing the requirements for the reliability of the switching device, avoiding false detection caused by the failure of the device monomer, and improving the safety and reliability of the system. Further, the clock signal input terminal CLK and the clear enable terminal / CLR of the D flip-flop are respectively connected to the output terminal of the first logic self-locking circuit. Among them, the clock signal input terminal CLK can receive the charging enable signal MCU_CTR from the first logic self-locking circuit, based on which, the triggering action of the D flip-flop U5 will depend on the validity of the charging enable signal. At the same time, the clear enable terminal / CLR can also receive the charging enable signal MCU_CTR output by the first logic self-locking circuit, which can be used to keep the charging control signal generated by the D flip-flop in the current cycle in a valid state. That is, in a complete charging cycle, as long as the charging enable signal does not drop to a low level, the D flip-flop will maintain its output state unchanged and will not be interfered by other signals, thereby ensuring the effectiveness of the charging control signal and controlling the switch on the phase line to be continuously closed. Furthermore, the output terminal Q of the D flip-flop is connected to the input terminal of the switch drive circuit and is used to output the charging control signal RLY_ON_ALLOW to the switch drive circuit. In this embodiment, when the D flip-flop U5 receives a valid charging enable signal and detects that there is no voltage output from the power grid, it will output a charging control signal to control the corresponding phase line switching switch to be closed through the switch drive circuit, thereby starting the charging process.

[0086] This embodiment uses a D flip-flop as the core logic control device to achieve accurate control of the charging control signal. By using the voltage detection signal as one of the control signals, the reliability requirements for the switch device can be reduced, thereby improving the safety and reliability of the system and reducing the circuit cost. In addition, the above circuit implements complex logical operation functions through the D flip-flop without the need for software, avoiding safety accidents that may be caused by software system failure, and can improve the overall performance and safety of the system.

[0087] In one embodiment, Figure 7As shown, the second logic self-locking circuit also includes a third AND gate circuit U3C and a fourth AND gate circuit U3D. The two input ends of the third AND gate circuit U3C are respectively connected to the output end of the voltage sampling circuit and the output end of the first logic self-locking circuit, and the output end is connected to the clock signal input end CLK of the D flip-flop. The third AND gate circuit U3C can be used to receive the voltage detection signal L1_OUT_STATUS and the charging enable signal MCU_CTR, and output a state change signal to the CLK clock signal input end of the D flip-flop. The state change signal is determined by the state of the voltage detection and the state of the MCU control. According to the state change signal, the input signal, that is, the voltage detection signal, is output to the output end of the D flip-flop. The two input ends of the fourth AND gate circuit U3D are connected to the output end of the first logic self-locking circuit, and the output end is connected to the clear enable end / CLR of the D flip-flop. The fourth AND gate circuit U3D can be used to receive the charging enable signal MCU_CTR, and output a stop clear signal to the D flip-flop to lock the state of the D flip-flop. Only when the MCU control signal transmitted by the charging enable signal MCU_CTR is charging on, the D flip-flop is turned on and the output signal can follow the input signal. When the MCU control signal transmitted by the charging enable signal MCU_CTR is charging off, the output of the D flip-flop does not follow the input signal and prohibits the relay from closing. The input of MCU_CTR serves as the enable end of the second logic self-locking circuit. By controlling the clock signal input end CLK and the clear enable end / CLR, the charging control signal RLY_ON_ALLOW follows the voltage detection signal L1_OUT_STATUS when the charging enable signal MCU_CTR and the voltage detection signal L1_OUT_STATUS are at the same level, or when the charging enable signal MCU_CTR is at the opposite level, the charging control signal RLY_ON_ALLOW is cleared and no longer follows L1_OUT_STATUS.

[0088] Specifically, the third AND gate circuit U3C can be used as a processing unit for the clock signal, and its two input terminals are respectively connected to the output terminal of the voltage sampling circuit and the output terminal of the first logic self-locking circuit. Based on this, the third AND gate circuit U3C can simultaneously receive the voltage detection signal L1_OUT_STATUS and the charging enable signal MCU_CTR. Only when these two signals meet specific conditions at the same time, the third AND gate circuit U3C will output a valid clock signal to the clock signal input terminal CLK of the D flip-flop. In this way, it can be ensured that the voltage detection signal and the charging enable signal jointly determine the clock input signal, and control the timing of the charging control signal RLY_ON_ALLOW to follow the voltage detection signal L1_OUT_STATUS. The rising edge of the clock signal triggers the following. Once the following begins, the charging control signal RLY_ON_ALLOW is constant, and the subsequent signals of the clock signal will no longer act on it unless the rising edge occurs again.

[0089] Furthermore, the fourth AND gate circuit U3D can be used as a processing unit for clearing signals, and both input terminals thereof are connected to the output terminal of the first logic self-locking circuit. Based on this, the fourth AND gate circuit U3D can be used to receive and process the charging enable signal MCU_CTR from the first logic self-locking circuit to generate a stop clearing signal. That is, when the first logic self-locking circuit sends a charging enable signal to start charging, the fourth AND gate circuit U3D will output a valid stop clearing signal to the clearing enable terminal / CLR of the D flip-flop, thereby ensuring that the charging control signal sent by the D flip-flop is not cleared, until the charging enable signal MCU_CTR changes and becomes the opposite level to end charging. The stop clearing signal of the fourth AND gate circuit U3D will control the charging control signal sent by the D flip-flop to be cleared and no longer follow the voltage detection signal L1_OUT_STATUS, and the charging cycle ends. The charging enable signal MCU_CTR controls the clearing enable terminal / CLR of the D flip-flop through the fourth AND gate circuit U3D, thereby increasing the reliability of the D flip-flop and preventing it from being interfered by noise signals.

[0090] This embodiment adds a third AND gate circuit and a fourth AND gate circuit to the clock pin and the clear pin of the D flip-flop, so that the charging enable signal participates in the control of both the clock signal input terminal CLK and the clear enable terminal / CLR, which can effectively improve the accuracy of the charging enable signal input to the D flip-flop and effectively avoid the interference of noise signals, thereby ensuring that the D flip-flop performs state conversion only when it receives the correct clock signal and clear signal, thereby outputting a more accurate and stable charging control signal.

[0091] In one embodiment, Figure 7 As shown, the second logic self-locking circuit also includes at least one second delay circuit, wherein the second delay circuit can be arranged at at least one of the following positions: between the output end of the first logic self-locking circuit and the input end of the third AND gate circuit U3C, and / or between the output end of the voltage sampling circuit and the input end of the third AND gate circuit U3C, and / or between the output end of the voltage sampling circuit and the data input end D of the D flip-flop U5, and / or between the output end of the third AND gate circuit U3C and the clock signal input end CLK of the D flip-flop U5, and / or between the output end of the fourth AND gate circuit U3D and the clear enable end / CLR of the D flip-flop U5.

[0092] Specifically, the second delay circuit may include components such as resistors and capacitors, wherein the number, connection method, and specification attributes of the resistors and capacitors can be designed according to the actual function of the circuit, and are not specifically limited herein. It is understandable that the delay duration of the second delay circuit can be obtained by setting the resistance value and / or capacitance value in the circuit, and testing the delay condition of the circuit. In this embodiment, the second delay circuit can be flexibly arranged on multiple critical paths of the second logic self-locking circuit. For example, the second delay circuit can be symmetrically arranged between multiple input terminals and multiple output terminals of every two logic devices, so as to improve the consistency of the signal and enhance the reliability and safety of the system.

[0093] This embodiment can ensure that the logic device in the second self-locking circuit has enough time to respond after receiving the voltage detection signal and the charging enable signal by setting the second delay circuit in the second logic self-locking circuit, thereby helping to reduce potential transient voltage spikes or other malfunctions caused by unstable conditions, thereby improving the reliability and safety of the system. In addition, by setting the second delay circuit on multiple paths in the second self-locking circuit, signals from different paths can be synchronized. In addition, by appropriately adjusting the delay time of the delay circuit, it can be ensured that the signals are input into the D flip-flop in the correct order.

[0094] In one embodiment, Figure 7 As shown, the delay length of the second delay circuit arranged between the output end of the fourth AND gate circuit U3D and the clear enable end / CLR of the D flip-flop U5 is shorter than the delay length of the second delay circuit arranged between the output end of the third AND gate circuit U3C and the clock signal input end CLK of the D flip-flop U5.

[0095] Specifically, the delay time length of the second delay circuit between the output end of the fourth AND gate circuit U3D and the clear enable end / CLR of the D flip-flop U5 can be designed to be shorter than the delay time length of the delay circuit between the output end of the third AND gate circuit U3C and the clock signal input end CLK of the D flip-flop U5. In this embodiment, the stop clear signal (from the fourth AND gate circuit U3D) can be used to prevent the D flip-flop U5 from being accidentally cleared, thereby maintaining its current state. The clock signal (from the third AND gate circuit U3C) is used to trigger the state transition of the D flip-flop. By making the delay time length of the stop clear signal shorter than the delay time length of the clock signal, it can be ensured that before the D flip-flop performs state transition, the stop clear signal has arrived and stably acts on the clear enable end of the D flip-flop, thereby avoiding the problem of the D flip-flop being mistakenly cleared due to the signal arrival time difference.

[0096] This embodiment can effectively improve the stability and accuracy of the charging control signal by setting the delay time of the second delay circuit and making it different on different paths. Moreover, the above design not only improves the working reliability of the D flip-flop, but also ensures that the charging control signal can be correctly processed and transmitted in the expected logical order, thereby improving the safety and stability of the system.

[0097] In one embodiment, as a supplement to the above-mentioned second self-locking circuit embodiment, as Figure 7 As shown, the truth table of each logic device of the second self-locking circuit is shown in Table 2. Among them, the D flip-flop U5 can follow and maintain the voltage detection signal L1_OUT_STATUS when the clock signal input terminal CLK and the clear enable terminal / CLR input high level, and output the charging control signal RLY_ON_ALLOW.

[0098] Table 2

[0099]

[0100] It can be seen from the above table that the second self-locking circuit outputs the charging control signal RLY_ON_ALLOW only when the voltage detection signal L1_OUT_STATUS and the charging enable signal MCU_CTR are both valid (the value is 1), thereby ensuring that only one of the control signals of the three phase line switches is valid, and the charging control signal can be output only when it is detected that the power grid does not output voltage, thereby controlling the corresponding phase line switch to close, so that only one phase line is connected to the load during the same charging period, thereby improving the safety of the charging control system.

[0101] In one embodiment, Figure 8 As shown, the switch driving circuit includes a plurality of fifth AND gate circuits U6A, U6B and U6C. Taking U6A as an example, the two input ends of the fifth AND gate circuit U6A are respectively connected to the output end of the logic self-locking circuit and the output end of the controller, and the output end of the fifth AND gate circuit U6A is connected to the control end of the phase line switching switch. Among them, the fifth AND gate circuit U6A can be used to output the switch driving signal RLY2_CTR to the control end of the phase line switching switch when receiving the charging control signal RLY_ON_ALLOW and the control signal MCU_RLY2_CTR of the phase line switching switch, so as to close the phase line switching switch and connect the phase line where the phase line switching switch is located to the load. It can be understood that the connection method and circuit function of the fifth AND gate circuits U6B and U6C are similar to those of U6A, and will not be repeated here.

[0102] Specifically, the switch drive circuit can realize accurate control of multiple phase line switching switches by integrating multiple fifth AND gate circuits. Taking the fifth AND gate circuit U6A as an example, its two input ends are respectively connected to the output end of the logic self-locking circuit and the output end of the controller. The logic self-locking circuit can be used to output the charging control signal RLY_ON_ALLOW, which indicates whether the current system allows charging operation; the controller is used to output the control signal MCU_RLY2_CTR of the phase line switching switch, which is used to indicate which phase line switching switch the current system needs to close. Further, when the fifth AND gate circuit U6A receives the charging control signal RLY_ON_ALLOW and the control signal MCU_RLY2_CTR of the phase line switching switch at the same time, its internal logic will perform an AND operation on these two signals, and output the switch drive signal RLY2_CTR to the control end of the phase line switching switch when the operation result is true. This signal will prompt the phase line switching switch to close quickly, so that the phase line where the phase line switching switch is located is connected to the load, thereby realizing the transmission of electric energy. In this embodiment, the fifth AND gate circuits U6B and U6C are similar to U6A in connection mode and circuit function. They are respectively used to control the switching switches of other phase lines, which will not be described in detail here.

[0103] This embodiment can achieve accurate control of the phase line switching switch by setting multiple fifth AND gate circuits in the switch drive circuit. The above switch drive circuit can ensure that the switching switch will output the switch drive signal and prompt the switching switch to operate only when it receives a valid charging control signal and a control signal of the phase line switching switch, thereby improving the accuracy and reliability of the switch control and avoiding the problem of malfunction or refusal to operate the switching switch due to misoperation or signal interference. At the same time, since multiple fifth AND gate circuits can work in parallel, the entire switch drive circuit can efficiently handle the switching requirements of multiple phase lines, thereby improving the overall performance and stability of the system.

[0104] In one embodiment, Figure 8 As shown, the switch driving circuit also includes at least one third delay circuit, wherein the third delay circuit can be set at at least one of the following positions: between the output end of the logic self-locking circuit and the input end of the fifth AND gate circuit U6A, U6B and U6C, and / or, between the output end of the controller and the input end of the fifth AND gate circuit U6A, U6B and U6C.

[0105] Specifically, the third delay circuit may include components such as resistors and capacitors, wherein the number, connection method, and specification attributes of the resistors and capacitors can be designed according to the actual function of the circuit, and are not specifically limited here. It is understandable that the delay duration of the third delay circuit can be obtained by setting the resistance value and / or capacitance value in the circuit and testing the delay condition of the circuit. In this embodiment, the third delay circuit can be flexibly arranged on multiple critical paths of the switch drive circuit. For example, the third delay circuit can be symmetrically arranged between the controller and the logic self-locking circuit and the input end of each AND gate circuit, so as to improve the consistency of the signal and enhance the reliability and safety of the system.

[0106] This embodiment can ensure that the fifth AND gate circuit has enough time to respond after receiving the control signal of the phase line switch and the charging control signal by setting the third delay circuit in the switch driving circuit, thereby helping to reduce potential transient voltage spikes or other malfunctions caused by unstable conditions, thereby improving the reliability and safety of the system. In addition, by setting the third delay circuit at the input end of the fifth AND gate circuit, signals from different paths can be synchronized. In addition, by appropriately adjusting the delay time of the delay circuit, the synchronization between different signals can be improved.

[0107] In one embodiment, Fig. 9 As shown, the voltage sampling circuit includes a photocoupler U44. The two input ends of the photocoupler U44 are respectively connected to the neutral line of the power grid and the output end of the switch component, and the output end is connected to the input end of the logic self-locking circuit. The photocoupler U44 can be used to convert the output phase voltage of the power grid, that is, the voltage between L1_RLY_OUT and N_IN, into a voltage detection signal L1_OUT_STATUS of the power grid, and output it to the logic self-locking circuit.

[0108] Specifically, the photocoupler, as a special electronic component, can electrically isolate the input and output and transmit signals at the same time. In the present embodiment, the two input terminals of the photocoupler U44 are respectively connected to the neutral line (N_IN) of the power grid and the output terminal (L1_RLY_OUT) of the switch assembly. Based on this, the photocoupler U44 can monitor the output voltage of the power grid between L1_RLY_OUT and N_IN, that is, monitor the actual phase voltage on the power grid. When the voltage of the power grid enters the photocoupler U44 through the two input terminals, the device can use the internal photoelectric effect to convert the electrical signal into an optical signal, and then convert the optical signal into an electrical signal, thereby realizing the isolated transmission of the voltage. In this process, the output terminal of the photocoupler U44 will generate a voltage detection signal L1_OUT_STATUS corresponding to the input voltage, and transmit this signal to the input terminal of the logic self-locking circuit for subsequent processing.

[0109] This embodiment can effectively isolate the high-voltage signal of the power grid from the low-voltage signal of the logic self-locking circuit by introducing a photocoupler into the voltage sampling circuit. In this way, not only the low-voltage control circuit is protected from high-voltage damage, but also the safety of the system is improved. At the same time, the converted voltage detection signal also has a lower voltage level and better signal quality, which is convenient for the logic self-locking circuit to perform subsequent processing.

[0110] In one embodiment, the photoelectric coupler may be an AC photoelectric coupler or a DC photoelectric coupler. Fig. 9 The voltage sampling circuit shown is the connection mode of AC photocoupler. Fig.10 The voltage sampling circuit shown is a DC optocoupler connection method. Fig.10 When the photocoupler is a DC photocoupler U45, the voltage sampling circuit also includes a rectifier bridge circuit and a voltage stabilizing filter circuit. The two input ends of the rectifier bridge circuit are respectively connected to the neutral line of the power grid and the output end of the switch component. The output end of the rectifier bridge circuit is connected to the input end of the voltage stabilizing filter circuit. The output end of the voltage stabilizing filter circuit is connected to the two input ends of the photocoupler U45. The output end of the photocoupler U45 is connected to the input end of the logic self-locking circuit. The photocoupler U45 can be used to convert the output phase voltage of the power grid, that is, the voltage between L1_RLY_OUT and N_RLY_IN, into a voltage detection signal L1_OUT_STATUS of the power grid, and output it to the logic self-locking circuit.

[0111] Specifically, the rectifier bridge circuit can be composed of diodes, and the voltage stabilizing filter circuit can be composed of resistors, capacitors, voltage stabilizing tubes and other devices. For example, refer to Fig.10 , the rectifier bridge circuit can be composed of a diode D100, and the voltage stabilizing filter circuit can be composed of components such as resistors R650, R651, R652, R653, capacitors C493, C499, C501, and TVS tube D101. In the present embodiment, the rectifier bridge can be used to convert the input AC voltage into a unidirectional pulsating DC voltage, thereby realizing the preliminary conversion of AC to DC. Subsequently, the output end of the rectifier bridge circuit is connected to the input end of the voltage stabilizing filter circuit, and the voltage stabilizing filter circuit can be used to further process the rectified pulsating DC voltage, including stabilizing the voltage level and filtering out unnecessary ripples and noise, etc., to generate a smooth and stable DC voltage signal. The DC voltage signal processed by the voltage stabilizing filter circuit is input to the two input ends of the DC photoelectric coupler U45. The photoelectric coupler U45 can utilize the photoelectric conversion characteristics to convert the DC voltage signal into a voltage detection signal L1_OUT_STATUS, and output it to the input end of the logic self-locking circuit.

[0112] This embodiment adopts a rectifier bridge circuit, a voltage stabilizing filter circuit and a DC optocoupler combined voltage sampling circuit to improve the detection capability and processing effect of the voltage sampling circuit on the grid voltage signal, thereby improving the stability and accuracy of the voltage detection signal, and further improving the safety and stability of the entire system.

[0113] In one embodiment, Fig.11 As shown, the flexible charging control system further includes a cloud server 60. The cloud server 60 is connected to the controller 30, and can be used to generate a phase line switching instruction according to the power occupied by each phase line, and send the phase line switching instruction to the controller 30, so that the controller 30 generates a control signal of the phase line switching switch corresponding to the phase line switching instruction.

[0114] Specifically, the cloud server 60 can communicate with the controller 30 in real time through a network connection. During this process, the cloud server 60 can collect real-time power data of each phase line, which can reflect the load conditions of different phase lines in the current charging network. Subsequently, the cloud server 60 can process and analyze these power data using a preset algorithm to evaluate the equilibrium state and potential risks of the current charging network. Then, a phase line switching instruction is generated based on the analysis results, and the phase line switching instruction is sent to the controller through the network. Furthermore, after receiving the instruction, the controller 30 can generate corresponding phase line switching switch control signals. These control signals are then sent to the corresponding phase line switching switches to implement the switching operation of the phase lines, thereby achieving the purpose of adjusting the power distribution of the charging network and optimizing the charging efficiency.

[0115] This embodiment introduces a cloud server to collect and analyze the power data of the charging network in real time, and generates a more accurate phase line switching instruction based on it, thereby solving the charging risk problem caused by the imbalance of the charging network. In this way, not only the safety and stability of the charging system are improved, but also the power distribution of the charging network is optimized, the risks of overheating and overload caused by uneven load are reduced, and the utilization rate of the overall distribution capacity is improved.

[0116] In one embodiment, Fig.12 As shown, a flexible charging control method is provided, which can be applied to the flexible charging control system described in any of the above embodiments. The charging control method includes:

[0117] 101. In response to a load charging instruction, obtain real-time power data of each phase line on the grid side;

[0118] 102. Determine a phase line switching strategy according to the real-time power data of each phase line on the grid side, and generate a control signal of the phase line switching switch according to the phase line switching strategy;

[0119] 103. Send the control signal of the phase line switch to the logic self-locking circuit and the switch driving circuit, so that the logic self-locking circuit and the switch driving circuit control the phase line switch to close according to the control signal of the phase line switch, so that only one phase line is connected to the load in the same charging period.

[0120] Specifically, when the system receives a load charging instruction, the controller can respond to the load charging instruction and obtain the power data of each phase line on the grid side in real time through its built-in communication interface or sensor network. Subsequently, the controller can use the built-in algorithm or logic to process and analyze the power data obtained in real time. This process may include calculating the power difference of each phase line, identifying overloaded or underloaded phase lines, etc., to evaluate the current power distribution state on the grid side. Based on the above evaluation results, the controller can determine the current phase line switching strategy, that is, decide which phase line is selected as the power supply phase line in the current charging period.

[0121] Furthermore, after determining the phase line switching strategy, the controller can generate control signals for the corresponding phase line switching switches, and send these control signals to the logic self-locking circuit and the switch driving circuit through the communication interface. After receiving the signal, the logic self-locking circuit can perform a series of safety checks and logic judgments to ensure the legality and correctness of the control signal; the switch driving circuit can drive the corresponding phase line switching switch to perform a closing operation according to the corresponding control signal and the charging control signal issued by the logic self-locking circuit, thereby realizing the function of only one phase line connected to the load during the same charging period.

[0122] It can be understood that, regarding the specific principle of the flexible charging control system controlling the closing of the phase line switch, reference can be made to the above-mentioned embodiments of the flexible charging control system, which will not be repeated here.

[0123] The flexible charging control method provided in this embodiment can realize refined control of the charging process by real-time monitoring of the power data of each phase line of the power grid and formulating a phase line switching strategy based on these data. In addition, by controlling the closing and opening of the phase line switching switch, it can be ensured that only one phase line is connected to the load during the same charging period. In this way, not only the risk of power grid overload caused by power concentration is avoided, but also the utilization rate of distribution capacity is improved.

[0124] In one embodiment, the above-mentioned flexible charging control method may further include the following steps: receiving a charging status signal output by a logic self-locking circuit; in a charging state, if the charging status signal is detected to be an invalid signal, setting the control signals of all phase line switching switches to invalid signals to cut off the connection between all phase lines and loads; in an idle state, if the charging status signal is detected to be a valid signal, setting the control signals of all phase line switching switches to invalid signals to cut off the connection between all phase lines and loads.

[0125] Specifically, in the flexible charging control system, the logic self-locking circuit, as a key circuit in the charging control process, can be used to monitor and feedback the actual working status of the charging pile to ensure the safety of the charging process. Specifically, in the charging state, the controller can continuously receive the charging status signal from the logic self-locking circuit. If the charging status signal is detected as an invalid signal, it means that there is an abnormality or potential safety risk in the current charging state, such as multiple phase line switching switches are closed at the same time. At this time, the controller can set the control signals of all phase line switching switches to invalid signals, thereby cutting off the connection between all phase lines and loads, thereby preventing safety hazards such as overcharging and short circuits that may be caused by abnormal control signals.

[0126] Similarly, in the idle state, if the controller detects that the charging status signal from the logic self-locking circuit becomes a valid signal, it also indicates that the system may be abnormal. To ensure safety, the controller can also set the control signal of all phase line switches to an invalid signal to ensure that the connection between all phase lines and loads is cut off, thereby preventing any unexpected charging operation from occurring.

[0127] This embodiment can effectively improve the safety and reliability of the flexible charging control system by monitoring the charging status signal output by the logic self-locking circuit. In this way, it is possible to promptly detect and respond to control signal anomalies caused by problems such as internal control logic errors, external interference or device failures in the controller, thereby quickly cutting off the connection between all phase lines and loads, thereby avoiding possible charging safety accidents.

[0128] In one embodiment, the above-mentioned flexible charging control method may further include the following steps: detecting the charging mode of the flexible charging control system, wherein the charging mode includes a single-phase charging mode and a multi-phase charging mode; in the charging state, if a single-phase charging mode is detected, a phase line switching switch in the switch assembly is controlled to be closed so that only one phase line is connected to the load in the same charging period; in the charging state, if a multi-phase charging mode is detected, multiple main power switches in the switch assembly are controlled to be closed so that multiple phase lines are connected to the load in the same charging period.

[0129] Specifically, before charging or during charging, the controller can detect the current charging mode of the flexible charging control system in real time through the built-in sensor or communication interface. Among them, the charging mode can include a single-phase charging mode and a multi-phase charging mode, and these two modes can be respectively applicable to different charging scenarios and charging requirements. In this embodiment, in the charging state, if it is detected that the current single-phase charging mode is in progress, the controller can accurately control the phase line by controlling the phase line switching switch in the switch assembly. Specifically, the controller can send a control signal of the phase line switching switch to the corresponding phase line switching switch to close a certain phase line switching switch, thereby ensuring that only one phase line is connected to the load during the same charging period. This single-phase charging mode helps to balance the grid load and reduce the grid pressure caused by power concentration. On the other hand, if it is detected that the current multi-phase charging mode is in progress, the controller can adopt different strategies. In this mode, the controller can control multiple main power switches in the switch assembly to close to allow multiple phase lines to be connected to the load during the same charging period. This multi-phase charging mode can effectively improve the charging efficiency and shorten the charging time, and is particularly suitable for scenarios that require fast charging.

[0130] This embodiment can effectively improve the flexibility and adaptability of the flexible charging control system by introducing a detection and response mechanism for the charging mode. In addition, this embodiment can freely switch between the single-phase charging mode and the multi-phase charging mode according to actual needs by setting a phase line switching switch and a main power switch in the switch assembly, thereby realizing refined control of the charging process.

[0131] In one embodiment, the above-mentioned flexible charging control method may further include the following steps: receiving a phase line switching instruction sent by a cloud controller, wherein the phase line switching instruction is generated by the cloud controller based on the real-time power data of each phase line on the grid side; generating a control signal of a phase line switching switch according to the phase line switching instruction, and sending the control signal of the phase line switching switch to the logic self-locking circuit and the switch driving circuit, so that the logic self-locking circuit and the switch driving circuit control the phase line switching switch to close according to the control signal of the phase line switching switch, and ensure that only one phase line is connected to the load during the same charging period.

[0132] Specifically, the controller can receive the phase line switching instruction from the cloud controller in real time through the communication link. Among them, the phase line switching instruction is generated by the cloud controller based on the real-time power data of each phase line on the grid side after algorithm analysis, aiming to optimize the power distribution of the charging network and ensure the safety and charging efficiency of the charging process. Furthermore, after receiving the phase line switching instruction, the controller can parse the instruction content and generate the corresponding control signal of the phase line switching switch according to the instruction requirements. Subsequently, the controller can send the generated control signal of the phase line switching switch to the logic self-locking circuit and the switch drive circuit. Furthermore, after receiving the signal, the logic self-locking circuit can perform a series of safety checks and logic judgments to ensure the legitimacy and correctness of the control signal; the switch drive circuit can drive the corresponding phase line switching switch to perform a closing operation according to the corresponding control signal and the charging control signal issued by the logic self-locking circuit, thereby realizing the function of only one phase line connected to the load in the same charging period.

[0133] This embodiment can achieve remote control of the flexible charging control process by introducing a cloud controller to send phase line switching instructions. Among them, the cloud controller can generate a corresponding phase line switching strategy based on the real-time power data of each phase line on the grid side, and transmit it to the charging system in real time through a communication link. In this way, not only the flexibility and response speed of the charging process are improved, but also the charging strategy can be dynamically adjusted according to the real-time status of the grid, so as to ensure the safety and efficiency of the charging process.

[0134] In one embodiment, the flexible charging control method may further include the following steps: real-time monitoring of the operation data on the grid side, wherein the operation data includes the status data of the phase line switching switch, the voltage data and the current data on the grid side; judging whether an operation fault occurs on the grid side according to the operation data on the grid side, wherein the operation fault includes at least one of abnormal grid voltage, overcurrent fault and short circuit fault; when an operation fault is detected on the grid side, setting the control signals of all phase line switching switches to invalid signals to cut off the connection between the phase line and the load.

[0135] Specifically, the controller can ensure the safety and stability of the charging process by monitoring the operation data on the grid side in real time. Specifically, the controller can collect various operation data on the grid side in real time through the sensor network or communication interface. These data may include but are not limited to the status data of the phase line switch (such as the open and closed state of the switch, fault information, etc.), the voltage data and current data on the grid side, etc. Subsequently, the controller can process and analyze the collected operation data through a preset algorithm or logic. The processing and analysis process may involve real-time monitoring of key parameters such as voltage and current, and compare them with preset safety thresholds to determine whether an operation fault occurs on the grid side. Among them, the operation fault includes but is not limited to abnormal grid voltage (such as too high or too low voltage), overcurrent fault (that is, the current exceeds the rated value) and short circuit fault (that is, the current increases abnormally and lasts for a very short time), etc. Further, once any of the above operation faults on the grid side is detected, the controller will respond immediately and set the control signals of all phase line switches to invalid signals, thereby quickly cutting off the connection between all phase lines and loads, thereby effectively isolating the fault source, preventing the fault from further expanding, and ensuring the safety of the charging equipment and the grid.

[0136] This embodiment can achieve safe monitoring and rapid response to the charging process by monitoring the operation data of the power grid in real time and judging whether the power grid has an operation fault based on the operation data. When an operation fault is detected on the power grid side, the controller can quickly cut off the connection between all phase lines and the load, thereby effectively isolating the fault source and preventing the fault from causing further damage to the charging equipment and the power grid. In this way, the safety and reliability of the flexible charging control system can be effectively improved.

[0137] The embodiment of the present application also provides a computer device, which can be a personal computer, a server, a network device, etc. The computer device includes a bus, a controller, a memory and a communication interface, and can also include an input and output interface and a display device. Among them, the controller of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store location information. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the controller, the steps in each method embodiment are implemented.

[0138] Those skilled in the art will appreciate that the structure of the above-mentioned computer device is only a partial structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components, or combine certain components, or have a different arrangement of components.

[0139] In one embodiment, a computer-readable storage medium is provided. The computer-readable storage medium may be non-volatile or volatile, and stores a computer program thereon. When the computer program is executed by a controller, the steps in the above-mentioned method embodiments are implemented.

[0140] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a controller.

[0141] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited thereto. The controller involved in each embodiment provided in this application may be a general controller, a graphics controller, a digital signal controller, a programmable device, a data controller based on quantum computing, etc., but are not limited thereto.

[0142] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0143] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations 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 shall be subject to the attached claims.

Claims

1. A flexible charging control system, characterized in that: The flexible charging control system comprises: A switch assembly, connected between the grid side and the load to be charged, comprising a plurality of phase line switching switches, each of which is connected in series between the grid side of a phase line and the load; A voltage sampling circuit, connected to the output end of the switch assembly, for detecting the output voltage of the power grid; A controller, used for sending a control signal of a phase line switching switch; A logic self-locking circuit is connected to the output end of the voltage sampling circuit and the output end of the controller, and is used to output a charging control signal when it is detected that the power grid does not output voltage and only one of the control signals of the phase line switch sent by the controller is valid; The switch driving circuit is connected to the output end of the controller and the output end of the logic self-locking circuit, and is used to control the phase line switching switch to close when only the control signal of one phase line switching switch and the charging control signal are received, so that only one phase line is connected to the load in the same charging period.

2. The system according to claim 1, characterized in that The switch assembly includes three phase line switching switches, the first ends of the three phase line switching switches are respectively connected to the three phase lines, and the second ends of the three phase line switching switches are connected together as the output end of the switch assembly and connected to the input end of the voltage sampling circuit.

3. The system according to claim 2, characterized in that The switch assembly further comprises at least one main power switch, which is connected in series between a phase line and the load and is used to control the on-off between the phase line and the load.

4. The system according to claim 1, characterized in that The output end of the logic self-locking circuit is also connected to the input end of the controller, and the logic self-locking circuit is also used to output a charging status signal to the controller.

5. The system according to claim 1, characterized in that The logic self-locking circuit includes a first logic self-locking circuit and a second logic self-locking circuit, wherein: The input end of the first logic self-locking circuit is connected to the output end of the controller, and the output end is connected to the enable end of the second logic self-locking circuit; the first logic self-locking circuit is used to receive control signals of the plurality of phase line switching switches, and output a charging enable signal when it is detected that only the control signal of one phase line switching switch is valid; The input end of the second logic self-locking circuit is connected to the output end of the voltage sampling circuit, the enable end is connected to the output end of the first logic self-locking circuit, and the output end is connected to the input end of the switch driving circuit; the second logic self-locking circuit is used to follow and maintain the voltage detection signal output by the voltage sampling circuit when receiving the charging enable signal to obtain the charging control signal.

6. The system according to claim 5, characterized in that The output end of the second logic self-locking circuit includes a first output end and a second output end, the first output end is connected to the input end of the switch drive circuit, and the second output end is connected to the input end of the controller; the second logic self-locking circuit is used to output the charging control signal to the switch drive circuit and output the charging status signal to the controller.

7. The system according to claim 5, characterized in that The switch assembly includes a first phase line switch, a second phase line switch and a third phase line switch; the first logic self-locking circuit includes a first XOR gate circuit, a second XOR gate circuit, a first AND gate circuit and a second AND gate circuit, wherein: The three input terminals of the first XOR gate circuit are respectively connected to the first output terminal, the second output terminal and the third output terminal of the controller; the first XOR gate circuit is used to receive control signals of the first phase line switch, the second phase line switch and the third phase line switch, and output a first logic operation signal; The two input ends of the first AND gate circuit are respectively connected to the first output end and the second output end of the controller; the first AND gate circuit is used to receive control signals of the first phase line switch and the second phase line switch, and output a second logic operation signal; The two input ends of the second AND gate circuit are respectively connected to the third output end of the controller and the output end of the first AND gate circuit; the second AND gate circuit is used to receive the control signal of the third phase line switch and the second logic operation signal, and output a third logic operation signal; The two input ends of the second XOR gate circuit are respectively connected to the output end of the first XOR gate circuit and the output end of the second AND gate circuit, and the output end is connected to the enable end of the second logic self-locking circuit; the second XOR gate circuit is used to receive the first logic operation signal and the third logic operation signal, and output the charging enable signal.

8. A flexible charging control method, characterized in that: The method is applied to the flexible charging control system according to any one of claims 1 to 7, and the method comprises: Responding to load charging instructions, obtaining real-time power data of each phase line on the grid side; Determine a phase line switching strategy according to the real-time power data of each phase line on the grid side, and generate a control signal of a phase line switching switch according to the phase line switching strategy; The control signal of the phase line switching switch is sent to the logic self-locking circuit and the switch driving circuit, so that the logic self-locking circuit and the switch driving circuit control the closing of the phase line switching switch according to the control signal of the phase line switching switch, so that only one phase line is connected to the load in the same charging period.

9. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to claim 8 is implemented.

10. A computer device comprising a storage medium, a processor, and a computer program stored in the storage medium and executable on the processor, characterized in that: When the processor executes the computer program, the method according to claim 8 is implemented.

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