A charging system and its control method

Abstract

The present invention discloses a charging system and its control method. The charging system includes at least two charging devices and a control device; the charging device includes a first charging module, a second charging module, a first switch, and a second switch; the input end of the first charging module is connected to the AC power grid, and the output end of the first charging module is connected to the load through the first switch; the input end of the second charging module is connected to the DC power grid, and the output end of the second charging module is connected to the load through the second switch; the control device is used to control the first switch to close at a first preset time and control the first switch to open at a second preset time; the control device is connected to the control end of the second switch, and the control device is used to control the second switch to close when the output power of the AC power grid is less than the target power or when the first switch is open. The technical solution of the embodiment of the present invention achieves the effect of meeting the charging requirements of the load, improves the charging speed for the load, reduces the charging time, and improves the charging efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of charging, and particularly to a charging system and a control method thereof. Background Art

[0002] With the wide application of electric vehicles, charging piles have developed rapidly.

[0003] Currently, the charging pile is powered by an AC power grid, and the charging pile converts the AC power into power for charging the electric vehicle. However, when the AC power grid supplies power to multiple charging piles, the power output from the AC power grid to one charging pile is low and cannot meet the charging requirements of the electric vehicle. Summary of the Invention

[0004] The present invention provides a charging system and a control method thereof to solve the problem that the power provided by the AC power grid to the charging pile is insufficient and cannot meet the charging requirements of the electric vehicle.

[0005] According to an aspect of the present invention, a charging system is provided. The charging system includes: at least two charging devices and a control device; the charging device includes a first charging module, a second charging module, a first switch, and a second switch;

[0006] The input end of the first charging module is connected to the AC power grid, and the output end of the first charging module is connected to the load through the first switch;

[0007] The input end of the second charging module is connected to the DC power grid, and the output end of the second charging module is connected to the load through the second switch;

[0008] The control device is connected to the control end of the first switch. The control device is configured to control the first switch to close at a first preset time and control the first switch to open at a second preset time to control the AC power grid to charge the load at a valley electricity price;

[0009] The control device is connected to the control end of the second switch. The control device is configured to control the second switch to close when the output power of the AC power grid is less than the target power or when the first switch is open to control the DC power grid to charge the load.

[0010] Optionally, the charging device further includes a third switch and an energy storage module;

[0011] The AC power grid is electrically connected to the input end of the energy storage module through the third switch;

[0012] The control device is connected to the control terminal of the third switch. The control device is configured to control the third switch to close when the output power of the AC power grid is greater than the target power, so that the AC power grid charges the energy storage module.

[0013] Optionally, the charging device further includes a fourth switch;

[0014] The output terminal of the energy storage module is electrically connected to the DC power grid through the fourth switch;

[0015] The control device is connected to the control terminal of the fourth switch. The control device is configured to control the fourth switch to close when the output power of the AC power grid is less than the target power, or when the first switch is open, so that the energy storage module supplies power to the load through the DC power grid.

[0016] Optionally, the charging system further includes at least one mobile charging device. The mobile charging device includes a fifth switch and a power battery;

[0017] The power battery is electrically connected to the DC power grid through the fifth switch. The control device is connected to the control terminal of the fifth switch. The control device is configured to control the fifth switch in the idle mobile charging device to close, so that the idle mobile charging device replenishes power to the in-use charging device through the DC power grid.

[0018] Optionally, the first charging module is an AC input charging module; the second charging module is a DC input charging module.

[0019] Optionally, the first charging module is an AC / DC dual-input charging module, and the second charging module is an AC / DC dual-input charging module;

[0020] The first charging module is reused as the second charging module.

[0021] Optionally, the charging device further includes a detection module;

[0022] The first end of the detection module is electrically connected to the AC power grid, and the second end of the detection module is connected to the control device. The detection module is configured to obtain parameter information of the AC power grid, and the control device is configured to determine the output power of the AC power grid according to the parameter information.

[0023] According to another aspect of the present invention, there is provided a control method for a charging system, which is used to control the charging system described in any embodiment of the present invention; the charging system includes: at least two charging devices and a control device; the charging device includes a first charging module, a second charging module, a first switch and a second switch; the input end of the first charging module is connected to the AC power grid, and the output end of the first charging module is connected to the load through the first switch; the input end of the second charging module is connected to the DC power grid, and the output end of the second charging module is connected to the load through the second switch; the control device is connected to the control end of the first switch, and the control device is connected to the control end of the second switch;

[0024] The control method includes:

[0025] Control the first switch to close at a first preset time and control the first switch to open at a second preset time to control the AC power grid to charge the load at the valley electricity price;

[0026] When the output power of the AC power grid is less than the target power, or when the first switch is open, control the second switch to close to control the DC power grid to charge the load.

[0027] Optionally, the charging device further includes a third switch and an energy storage module; the AC power grid is electrically connected to the input end of the energy storage module through the third switch; the control device is connected to the control end of the third switch;

[0028] The control method further includes:

[0029] When the output power of the AC power grid is greater than the target power, control the third switch to close so that the AC power grid charges the energy storage module.

[0030] Optionally, the charging device further includes a fifth switch and a power battery; the power battery is electrically connected to the DC power grid through the fifth switch, and the control device is connected to the control end of the fifth switch;

[0031] The control method further includes:

[0032] Control the fifth switch in the idle mobile charging device to close so that the idle mobile charging device replenishes power for the charging device in use through the DC power grid.

[0033] In the technical solution of the embodiment of the present invention, by setting up a DC power grid and a second charging module, when the output power of the AC power grid is less than the target power required by the load, the control device controls the DC power grid to charge the load through the second charging module, that is, the AC power grid and the DC power grid charge the load together. When the output power of the AC power grid is less than the target power, power compensation is carried out through the DC power grid, which can meet the charging requirements of the load, improve the charging speed of the load, reduce the charging time, and improve the charging efficiency. Moreover, the control device controls the AC power grid to charge the load within the first preset time, that is, the AC power grid charges the load during the valley electricity price time; at the second preset time, that is, when it is not the valley electricity price time, the control device controls the DC power grid to charge the load, which can reduce the charging cost and enhance the user experience. The technical solution of the embodiment of the present invention solves the problem that the AC power grid provides insufficient power for the charging pile and cannot meet the charging requirements of electric vehicles, achieves the effect of meeting the charging requirements of the load, improves the charging speed of the load, reduces the charging time, and improves the charging efficiency; it also realizes the effect of reducing the charging cost and enhancing the user experience.

[0034] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understandable through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0036] Figure 1 is a schematic structural diagram of a charging system provided by an embodiment of the present invention;

[0037] Figure 2 is a schematic structural diagram of another charging system provided by an embodiment of the present invention;

[0038] Figure 3 is a schematic structural diagram of another charging system provided by an embodiment of the present invention;

[0039] Figure 4 is a flowchart of a control method for a charging system provided by an embodiment of the present invention;

[0040] Figure 5 is a flowchart of another control method for a charging system provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] To enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0042] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0043] Figure 1 is a schematic structural diagram of a charging system provided by an embodiment of the present invention. Refer to Figure 1 , the charging system includes: at least one charging device 100 and a control device 200; the charging device 100 includes at least one first charging module 101, at least one second charging module 102, at least one first switch 103 and at least one second switch 104; the input end of the first charging module 101 is connected to the AC power grid L1, and the output end of the first charging module 101 is connected to the load 300 through the first switch 103; the input end of the second charging module 102 is connected to the DC power grid L2, and the output end of the second charging module 102 is connected to the load 300 through the second switch 104; the control device 200 is connected to the control end of the first switch 103, and the control device 200 is configured to control the first switch 103 to close at a first preset time and control the first switch 103 to open at a second preset time to control the AC power grid L1 to charge the load 300 at the valley electricity price; the control device 200 is connected to the control end of the second switch 104, and the control device 200 is configured to control the second switch 104 to close when the output power of the AC power grid L1 is less than the target power or when the first switch 103 is open to control the DC power grid L2 to charge the load 300.

[0044] Among them, the charging device 100 is, for example, a charging pile, and the control device 200 is the main control system of the charging pile, which can communicate with the charging pile and can also communicate with the load 300; the load 300 is, for example, an electric vehicle, or can be an electric bicycle, or can be other devices to be powered.

[0045] Specifically, when the load 300 needs to be charged, if the current time is within the first preset time, and the first preset time is, for example, the valley electricity price time, the control device 200 controls the first switch 103 to close, and the AC power grid L1 supplies power to the load through the first charging module 101; the control device 200 can obtain the target power required for the load to charge by communicating with the load 300, and the control device 200 can obtain the output power of the AC power grid L1 by communicating with the charging device 100; when the output power of the AC power grid L1 is less than the target power required by the load 300, the control device 200 controls the second switch 104 to close, and the DC power grid L2 charges the load 300 through the second charging module 102, that is, the AC power grid L1 and the DC power grid L2 charge the load 300 together, so that when the output power of the AC power grid L1 is less than the target power, the DC power grid L2 is used for supplementary power supply, thereby meeting the charging requirements of the load 300, improving the charging speed for the load 300, reducing the charging time, and improving the charging efficiency. Moreover, when the load 300 needs to be charged, if the current time is within the second preset time, that is, not during the valley electricity price time, the control device 200 controls the first switch 103 to open and controls the second switch 104 to close, and the DC power grid L2 charges the load 300 through the second charging module 102, which can reduce the charging cost and improve the user experience.

[0046] It should be noted that Figure 1 the load 300 in Figure 1 only shows the case where each charging module is separately connected to the load 300, but it is not limited.

[0047] The technical solution of this embodiment is to set up a DC power grid and a second charging module. When the output power of the AC power grid is less than the target power required by the load, the control device controls the DC power grid to charge the load through the second charging module, that is, the AC power grid and the DC power grid charge the load together. When the output power of the AC power grid is less than the target power, supplementary power is provided through the DC power grid, which can meet the charging requirements of the load, improve the charging speed of the load, reduce the charging time, and improve the charging efficiency. Moreover, the control device controls the AC power grid to charge the load within the first preset time, that is, the AC power grid charges the load during the valley electricity price time; at the second preset time, that is, when it is not the valley electricity price time, the control device controls the DC power grid to charge the load, which can reduce the charging cost and enhance the user experience. The technical solution of this embodiment solves the problem that the AC power grid provides insufficient power for the charging pile and cannot meet the charging requirements of electric vehicles, achieves the effect of meeting the charging requirements of the load, improves the charging speed of the load, reduces the charging time, and improves the charging efficiency; it also realizes the effect of reducing the charging cost and enhancing the user experience.

[0048] Figure 2 is a schematic structural diagram of another charging system provided by an embodiment of the present invention. Optionally, referring to Figure 2 , the charging device 100 further includes at least one first charging gun 410 and at least one second charging gun 420; the first switch 103 is connected to the load 300 through the first charging gun 410, and the second switch 104 is connected to the load 300 through the second charging gun 420; optionally, referring to Figure 2 , the charging device 100 further includes at least one first connection switch 431, at least one second connection switch 432, and at least one third connection switch 433; two adjacent first switches 103 are connected through the first connection switch 431, two adjacent second switches 104 are connected through the second connection switch 432, and an adjacent first switch 103 and second switch 104 are connected through the third connection switch 433.

[0049] Specifically, when the load 300 is connected to the first charging gun 410, if the current time is within the first preset time, the control device 200 controls the first switch 103 to close, and the AC power grid L1 outputs voltage to the first charging module 101. The first charging module 101 charges the load 300 through the first charging gun 410; when the output power of the AC power grid L1 is less than the target power, the control device 200 controls the second switch 104 and the third connection switch 433 to close; the DC power grid L2 outputs voltage to the second charging module 102, and the second charging module 102 outputs voltage to the first charging gun 410 through the second switch 104 and the third connection switch 433, then the AC power grid L1 and the DC power grid L2 charge the load 300 together through the first charging gun 410.

[0050] When the load 300 is connected to the second charging gun 420, if the current time is within the first preset time, the control device 200 controls the first switch 103 and the third connection switch 433 to close. The AC power grid L1 outputs voltage to the first charging module 101. The first charging module 101 outputs voltage to the second charging gun 420 through the first switch 103 and the third connection switch 433. The first charging module 101 charges the load 300 through the second charging gun 420. When the output power of the AC power grid L1 is less than the target power, the control device 200 controls the second switch 1040 to close. The DC power grid L2 outputs voltage to the second charging module 102. The second charging module 102 outputs voltage to the second charging gun 420 through the second switch 104. Then, the AC power grid L1 and the DC power grid L2 together charge the load 300 through the second charging gun 420.

[0051] Exemplarily, when multiple first charging modules 101 are required to supply power to one charging gun, the control device 200 controls the first connection switch 431 between the multiple first charging modules 101 to close. When multiple second charging modules 102 are required to supply power to one charging gun, the control device 200 controls the second connection switch 432 between the multiple second charging modules 102 to close.

[0052] Optionally, referring to Figure 2 , the charging device 100 further includes a third switch 105 and an energy storage module 106. The AC power grid L1 is electrically connected to the input end of the energy storage module 106 through the third switch 105. The control device 200 is connected to the control end of the third switch 105. The control device 200 is configured to control the third switch 105 to close when the output power of the AC power grid L1 is greater than the target power, so that the AC power grid L1 charges the energy storage module 106.

[0053] Specifically, when the output power of the AC power grid L1 is greater than the target power, the AC power grid L1 is controlled to charge the energy storage module 106. The energy storage module 106 can store electric energy, thereby storing the excess energy of the AC power grid L1 and achieving the effect of energy conservation. When the output power of the AC power grid L1 is insufficient or the AC power grid L1 fails, the energy storage module 106 can be controlled to charge the load 300, thus ensuring normal charging of the load 300.

[0054] It should be noted that in some other embodiments, the energy storage module 106 can also be charged by other power supply devices.

[0055] Optionally, referring to Figure 2, the charging device 100 further includes a fourth switch 107; the output end of the energy storage module 106 is electrically connected to the DC power grid L2 through the fourth switch 107; the control device 200 is connected to the control end of the fourth switch 107, and the control device 200 is configured to control the fourth switch 107 to close when the output power of the AC power grid L1 is less than the target power or when the first switch 103 is disconnected, so that the energy storage module 106 supplies power to the load 300 through the DC power grid L1.

[0056] Specifically, when the output power of the AC power grid L1 is less than the target power, the energy storage module 106 is controlled to discharge to the DC power grid L1, so that the energy storage module 106 supplies power to the load 300 through the DC power grid L1, and the AC power grid L1 and the DC power grid L2 charge the load 300 together, so that when the output power of the AC power grid L1 is less than the target power, power is supplemented through the DC power grid L2, thereby improving the charging speed of the load 300, reducing the charging time, and improving the charging efficiency. When the first switch 103 is disconnected, the energy storage module 106 is controlled to discharge to the DC power grid L1, so that the energy storage module 106 supplies power to the load 300 through the DC power grid L1, achieving the effects of energy saving and cost saving.

[0057] It should be noted that the power of the DC power grid L2 can be sourced from a power supply station or from the energy storage module 106. The control device 200 is connected to the energy storage module 106 and can obtain the power of the energy storage module 106; when the power of the energy storage module 106 is greater than or equal to the preset power, the energy storage module 106 can be controlled to supply power to the load 300 through the DC power grid L1; when the power of the energy storage module 106 is less than the preset power, the DC power grid L2 is controlled to draw power from the power supply station.

[0058] Optionally, referring to Figure 2 , the charging system further includes at least one mobile charging device 400. The mobile charging device includes a fifth switch 108 and a power battery 109; the power battery 109 is electrically connected to the DC power grid L2 through the fifth switch 108. The control device 200 is connected to the control end of the fifth switch 108, and the control device 200 is configured to control the fifth switch 108 in the idle mobile charging device 400 to close, so that the idle mobile charging device 400 supplies power to the in-use charging device 100 through the DC power grid L2.

[0059] Specifically, the mobile charging device 400 is, for example, a mobile charging pile, which can move; the mobile charging pile can supply power to a load and can also recharge other charging devices 100 when it is idle. When the mobile charging pile is idle and there is a charging device 100 in use, if the control device 200 determines that the output power of the AC power grid L2 of the charging device 100 in use is less than the target power of the load 300, the control device 200 controls the fifth switch 108 in the idle mobile charging device 400 to close, and controls the idle mobile charging device 400 to move near the charging device 100 in use. Then, the power battery 109 of the idle mobile charging device 400 supplies power to the DC power grid L2, so that the idle mobile charging device 400 recharges the charging device 100 in use through the DC power grid L2, thereby meeting the charging requirements of the load 300, improving the charging speed for the load 300, reducing the charging time, and improving the charging efficiency.

[0060] Optionally, referring to Figure 2 , the first charging module 101 is an AC input charging module; the second charging module 102 is a DC input charging module.

[0061] Specifically, the first charging module 101 is an AC input charging module, and the output of the first charging module 101 can be an AC output or a DC output; the second charging module 102 is a DC input charging module and can be an AC output or a DC output.

[0062] Figure 3 is a schematic structural diagram of another charging system provided by an embodiment of the present invention. Optionally, referring to Figure 3 , the first charging module 101 is an AC / DC dual-input charging module, and the second charging module 102 is an AC / DC dual-input charging module; the first charging module 101 is multiplexed as the second charging module 102.

[0063] Specifically, both the first charging module 101 and the second charging module 102 are AC / DC dual-input charging modules, and the output of the AC / DC dual-input charging module can be an AC output or a DC output. When both the first charging module 101 and the second charging module 102 are AC / DC dual-input charging modules, the first charging module 101 is multiplexed as the second charging module 102, which can reduce the number of charging modules and lower the cost.

[0064] Optionally, referring to Figure 2 and Figure 3, the charging device 100 further includes a detection module 110; the first end of the detection module 110 is electrically connected to the AC power grid L1, the second end of the detection module 110 is connected to the control device 200, and the detection module 110 is used to obtain parameter information of the AC power grid L1, and the control device 200 is used to determine the output power of the AC power grid L1 according to the parameter information.

[0065] Specifically, the parameter information includes, for example, voltage information and current information. Then, the control device 200 can calculate the output power of the AC power grid L1 according to the voltage information and current information, so as to determine whether the output power of the AC power grid L1 meets the charging requirements of the load 300.

[0066] Optionally, referring to Figure 2 and Figure 3 , the charging device 100 further includes a sixth switch 120 and a seventh switch 130; the input end of the first charging module 101 is electrically connected to the AC power grid L1 through the sixth switch 120; the input end of the second charging module 102 is electrically connected to the DC power grid L2 through the seventh switch 130; the control device 200 is connected to the control end of the sixth switch 120, and the control device 200 is connected to the control end of the seventh switch 130.

[0067] Specifically, by setting the sixth switch 120 and the seventh switch 130, when the AC power grid L1 is required to charge the load 300, the control device 200 controls the sixth switch 120 to close; when the AC power grid L1 is not required to charge the load 300, the control device 200 controls the sixth switch 120 to open. When the DC power grid L2 is required to charge the load 300, the control device 200 controls the seventh switch 130 to close; when the DC power grid L2 is not required to charge the load 300, the control device 200 controls the seventh switch to open.

[0068] Exemplarily, when the load 300 needs to be charged, if the current time is within the first preset time, for example, the valley electricity price time, the control device 200 controls the first switch 103 and the six-switch 120 to close, and the AC power grid L1 supplies power to the load through the first charging module 101; when the output power of the AC power grid L1 is less than the target power required by the load 300, the control device 200 controls the second switch 104 and the seventh switch 130 to close, and the DC power grid L2 charges the load 300 through the second charging module 102, that is, the AC power grid L1 and the DC power grid L2 charge the load 300 together. When the output power of the AC power grid L1 is less than the target power, make up the power through the DC power grid L2, so as to meet the charging demand of the load 300, thereby improving the charging speed of the load 300, reducing the charging time, and improving the charging efficiency. When the load 300 needs to be charged, if the current time is within the second preset time, that is, not at the valley electricity price time, the control device 200 controls the first switch 103 and the six-switch 120 to disconnect, and controls the second switch 104 and the seventh switch 130 to close, and the DC power grid L2 charges the load 300 through the second charging module 102, which can reduce the charging cost and improve the user experience.

[0069] It should be noted that referring to Figure 2 and Figure 3 , the connection between the control device 200 and each switch means that the control device 200 can control each switch, and does not mean that the control device 200 is connected to multiple switches through a single line.

[0070] Figure 4 is a flowchart of a control method for a charging system provided by an embodiment of the present invention. The control method of the charging system is used to control the charging system provided by any embodiment of the present invention; referring to Figure 1 and Figure 4 , the control method of the charging system includes:

[0071] S401. Control the first switch to close at the first preset time and control the first switch to open at the second preset time to control the AC power grid to charge the load at the valley electricity price.

[0072] Specifically, when the load 300 needs to be charged, if the current time is within the first preset time, for example, the valley electricity price time, the control device 200 controls the first switch 103 to close, and the AC power grid L1 supplies power to the load through the first charging module 101; when the load 300 needs to be charged, if the current time is within the second preset time, that is, not at the valley electricity price time, the control device 200 controls the first switch 103 to open, so that the AC power grid L1 charges the load 300 at the valley electricity price, which can reduce the charging cost and improve the user experience.

[0073] S402. When the output power of the AC power grid is less than the target power, or when the first switch is disconnected, control the second switch to close to control the DC power grid to charge the load.

[0074] Specifically, the control device 200 can communicate with the load 300 to obtain the target power required for the load to charge, and the control device 200 can communicate with the charging device 100 to obtain the output power of the AC power grid L1; when the output power of the AC power grid L1 is less than the target power required by the load 300, the control device 200 controls the second switch 104 to close, and the DC power grid L2 charges the load 300 through the second charging module 102, that is, the AC power grid L1 and the DC power grid L2 charge the load 300 together, so that when the output power of the AC power grid L1 is less than the target power, make up the power through the DC power grid L2, thereby meeting the charging requirements of the load 300, which can improve the charging speed of the load 300, reduce the charging time, and improve the charging efficiency. And when the load 300 needs to be charged, if the current time is within the second preset time, that is, not during the valley electricity price time, the control device 200 controls the first switch 103 to disconnect and the second switch 104 to close, and the DC power grid L2 charges the load 300 through the second charging module 102, which can reduce the charging cost and improve the user experience.

[0075] Figure 5 It is a flowchart of another control method for a charging system provided by an embodiment of the present invention. Refer to Figure 2 and Figure 5 , the control method of the charging system includes:

[0076] S501. Control the first switch to close at the first preset time and control the first switch to disconnect at the second preset time to control the AC power grid to charge the load at the valley electricity price.

[0077] S502. When the output power of the AC power grid is less than the target power, or when the first switch is disconnected, control the second switch to close to control the DC power grid to charge the load.

[0078] S503. When the output power of the AC power grid is greater than the target power, control the third switch to close to enable the AC power grid to charge the energy storage module.

[0079] Specifically, when the output power of the AC power grid L1 is greater than the target power, control the AC power grid L1 to charge the energy storage module 106, and the energy storage module 106 can store electric energy, so as to store the excess energy of the AC power grid L1, achieving the effect of energy saving; when the output power of the AC power grid L1 is insufficient or the AC power grid L1 fails, the energy storage module 106 can be controlled to charge the load 300, so as to ensure normal charging of the load 300.

[0080] S504. When the output power of the AC power grid is less than the target power, or when the first switch is turned off, control the fourth switch to close so that the energy storage module supplies power to the load through the DC power grid.

[0081] Specifically, when the output power of the AC power grid L1 is less than the target power, control the energy storage module 106 to discharge to the DC power grid L1, so that the energy storage module 106 supplies power to the load 300 through the DC power grid L1, and the AC power grid L1 and the DC power grid L2 charge the load 300 together. When the output power of the AC power grid L1 is less than the target power, make up the power through the DC power grid L2, so that the charging speed of the load 300 can be increased, the charging time can be reduced, and the charging efficiency can be improved. When the first switch 103 is turned off, control the energy storage module 106 to discharge to the DC power grid L1, so that the energy storage module 106 supplies power to the load 300 through the DC power grid L1, achieving the effects of energy saving and cost saving.

[0082] S505. Control the fifth switch in the idle mobile charging device to close so that the idle mobile charging device supplies power to the charging device in use through the DC power grid.

[0083] Specifically, the mobile charging device 400 is, for example, a mobile charging pile, and the mobile charging pile can move; the mobile charging pile can supply power to the load and can also supply power to other charging devices 100 when it is idle. When the mobile charging pile is idle and there is a charging device 100 in use, if the control device 200 determines that the output power of the AC power grid L2 of the charging device 100 in use is less than the target power of the load 300, the control device 200 controls the fifth switch 108 in the idle mobile charging device 400 to close and controls the idle mobile charging device 400 to move near the charging device 100 in use. Then, the power battery 109 of the idle mobile charging device 400 supplies power to the DC power grid L2, so that the idle mobile charging device 400 supplies power to the charging device 100 in use through the DC power grid L2, thereby meeting the charging requirements of the load 300, increasing the charging speed of the load 300, reducing the charging time, and improving the charging efficiency.

[0084] It should be understood that the various forms of the processes shown above can be used, and the steps can be reordered, added, or deleted. For example, the steps described in the present invention can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0085] The above specific embodiments do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub - combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A charging system, characterized in that, Comprising: At least one charging device and a control device; the charging device includes at least one first charging module, at least one second charging module, at least one first switch and at least one second switch; The input end of the first charging module is connected to the AC power grid, and the output end of the first charging module is connected to the load through the first switch; The input end of the second charging module is connected to the DC power grid, and the output end of the second charging module is connected to the load through the second switch; The control device is connected to the control end of the first switch, and the control device is used to control the first switch to close at a first preset time and control the first switch to open at a second preset time to control the AC power grid to charge the load at the valley electricity price; The control device is connected to the control end of the second switch, and the control device is used to control the second switch to close when the output power of the AC power grid is less than the target power or when the first switch is open to control the DC power grid to charge the load; The charging device further includes at least one first charging gun and at least one second charging gun; the first switch is connected to the load through the first charging gun, and the second switch is connected to the load through the second charging gun; The charging device further includes at least one first connection switch, at least one second connection switch and at least one third connection switch; two adjacent first switches are connected through the first connection switch, two adjacent second switches are connected through the second connection switch, and the adjacent first switch and the second switch are connected through the third connection switch.

2. The charging system according to claim 1, wherein The charging device further includes a third switch and an energy storage module; The AC power grid is electrically connected to the input end of the energy storage module through the third switch; The control device is connected to the control end of the third switch, and the control device is used to control the third switch to close when the output power of the AC power grid is greater than the target power so that the AC power grid charges the energy storage module.

3. The charging system according to claim 2, wherein The charging device further includes a fourth switch; The output end of the energy storage module is electrically connected to the DC power grid through the fourth switch; The control device is connected to the control end of the fourth switch, and the control device is used to control the fourth switch to close when the output power of the AC power grid is less than the target power or when the first switch is open so that the energy storage module supplies power to the load through the DC power grid.

4. The charging system according to claim 1, wherein It further includes at least one mobile charging device, and the mobile charging device includes a fifth switch and a power battery; The power battery is electrically connected to the DC power grid through the fifth switch, and the control device is connected to the control end of the fifth switch. The control device is used to control the fifth switch in the idle mobile charging device to close so that the idle mobile charging device replenishes power for the charging device in use through the DC power grid.

5. The charging system according to claim 1, wherein The first charging module is an AC input charging module; the second charging module is a DC input charging module.

6. The charging system according to claim 1, wherein The first charging module is an AC-DC dual-input charging module, and the second charging module is an AC-DC dual-input charging module; The first charging module is reused as the second charging module.

7. The charging system according to claim 1, wherein The charging device further includes a detection module; A first end of the detection module is electrically connected to the AC power grid, a second end of the detection module is connected to the control device, the detection module is configured to obtain parameter information of the AC power grid, and the control device is configured to determine the output power of the AC power grid according to the parameter information.

8. A control method for a charging system, characterized in that, For controlling the charging system according to any one of claims 1-7; the charging system includes: at least one charging device and a control device; the charging device includes at least one first charging module, at least one second charging module, at least one first switch and at least one second switch; an input end of the first charging module is connected to the AC power grid, an output end of the first charging module is connected to the load through the first switch; an input end of the second charging module is connected to the DC power grid, an output end of the second charging module is connected to the load through the second switch; the control device is connected to a control end of the first switch, and the control device is connected to a control end of the second switch; The charging device further includes at least one first charging gun and at least one second charging gun; the first switch is connected to the load through the first charging gun, and the second switch is connected to the load through the second charging gun; The charging device further includes at least one first connection switch, at least one second connection switch and at least one third connection switch; two adjacent first switches are connected through the first connection switch, two adjacent second switches are connected through the second connection switch, and an adjacent first switch and second switch are connected through the third connection switch; The control method includes: Controlling the first switch to close at a first preset time and controlling the first switch to open at a second preset time to control the AC power grid to charge the load at valley electricity price; When the output power of the AC power grid is less than the target power, or when the first switch is open, controlling the second switch to close to control the DC power grid to charge the load; The control method further includes: When the load is connected to the first charging gun, if the current time is within the first preset time, controlling the first switch to close, and if the output power of the AC power grid is less than the target power, controlling the second switch and the third connection switch to close to control the AC power grid and the DC power grid to charge the load together through the first charging gun; When the load is connected to the second charging gun, if the current time is within the first preset time, controlling the first switch and the third connection switch to close, and if the output power of the AC power grid is less than the target power, controlling the second switch to close to control the AC power grid and the DC power grid to charge the load together through the second charging gun.

9. The control method of the charging system according to claim 8, characterized in that, The charging device further includes a third switch and an energy storage module; the AC power grid is electrically connected to the input end of the energy storage module through the third switch; the control device is connected to the control end of the third switch; The control method further includes: When the output power of the AC power grid is greater than the target power, controlling the third switch to close so that the AC power grid charges the energy storage module.

10. The control method of the charging system according to claim 8, characterized in that, The charging system further includes at least one mobile charging device, and the mobile charging device includes a fifth switch and a power battery; the power battery is electrically connected to the DC power grid through the fifth switch, and the control device is connected to the control end of the fifth switch; The control method further includes: Controlling the fifth switch in the idle mobile charging device to close so that the idle mobile charging device replenishes power for the charging device in use through the DC power grid.

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