A control device for a busbar cabinet and a busbar cabinet

Abstract

This utility model provides a control device and a combiner box for a combiner box, relating to the field of combiner box technology. In this embodiment, the combiner box includes a first power supply line, a first current sensor electrically connected to the first power supply line, and a first switching circuit. The first switching circuit is used to turn the first power supply line on or off, and the first current sensor is used to sample a first current in the first power supply line and generate a first current sampling signal. The control device is detachably connected to the combiner box and includes: a first interface electrically connected to the first current sensor; a second interface electrically connected to the control terminal of the first switching circuit; and a first control circuit electrically connected to the first and second interfaces, used to receive the first current sampling signal, generate a first switching control signal based on the first current sampling signal, and transmit the first switching control signal to the first switching circuit. Therefore, the upgrade and maintenance costs of the combiner box are reduced.

Description

Technical Field

[0001] This utility model relates to the field of junction box technology, and in particular to a control device for a junction box and a junction box. Background Technology

[0002] Combiner boxes are widely used in power supply links such as substations, transmission lines, and distribution networks because they have functions such as current collection and circuit protection, in order to ensure the stable operation of the power system and safe power supply.

[0003] The existing combiner box hardware cannot be upgraded. If a simplified combiner box is used, and the user wants to upgrade its functionality, they must choose a new combiner box with more hardware, increasing the upgrade cost. Furthermore, if the combiner box hardware malfunctions, because all hardware components are non-removable, it's difficult to quickly locate the faulty component. This often necessitates replacing the entire combiner box, further increasing maintenance costs.

[0004] Therefore, reducing the upgrade and maintenance costs of combiner boxes is a problem that needs to be solved. Utility Model Content

[0005] This utility model provides a control device and a junction box for use in reducing the upgrade and maintenance costs of the junction box.

[0006] In a first aspect, this utility model provides a control device for a combiner box, the combiner box including a first power supply line, a first current sensor electrically connected to the first power supply line, and a first switching circuit, the first switching circuit being used to turn on or off the first power supply line, and the first current sensor being used to sample a first current in the first power supply line and generate a first current sampling signal; wherein, the control device is detachably connected to the combiner box, and the control device includes:

[0007] The first interface is used for electrical connection with the first current sensor;

[0008] The second interface is used for electrical connection with the control terminal of the first switching circuit;

[0009] A first control circuit, electrically connected to the first interface and the second interface, is used to receive the first current sampling signal through the first interface, generate a first switch control signal based on the first current sampling signal, and transmit the first switch control signal to the first switch circuit through the second interface.

[0010] In a second aspect, embodiments of the present invention provide a combiner box, wherein the combiner box is detachably connected to a control device for the combiner box as described in the first aspect, and the combiner box includes:

[0011] First power supply line;

[0012] A first current sensor is electrically connected to the first power supply line and is used to sample the first current of the first power supply line and generate a first current sampling signal.

[0013] The first switching circuit is electrically connected to the first power supply line and is used to turn the first power supply line on or off.

[0014] The beneficial effects of this utility model are as follows:

[0015] In the control device for a combiner box provided in this embodiment of the utility model, a detachable control device is provided for the combiner box. Furthermore, by providing a first interface electrically connected to a first current sensor of the combiner box and a second interface electrically connected to a first switching circuit of the combiner box, the first control circuit of the control device can receive a first current sampling signal through the first interface, generate a first switching control signal based on the first current sampling signal, and transmit the first switching control signal to the first switching circuit of the combiner box through the second interface. By placing the core function of the combiner box (e.g., switching control) on a detachable control device, the problem of existing combiner boxes having non-removable hardware and requiring replacement of the entire unit for upgrades and maintenance is effectively solved, thus reducing the upgrade and maintenance costs of the combiner box.

[0016] Furthermore, other features and advantages of this invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described herein are used to provide a further understanding of this utility model, constitute a part of this utility model, and do not constitute an improper limitation of this utility model. In the accompanying drawings:

[0018] Figure 1 This is a schematic diagram of the composition structure of a control device for a combiner box provided in an embodiment of the present utility model.

[0019] Figure 2 This is a schematic diagram of the composition of another control device for a combiner box provided in an embodiment of the present utility model.

[0020] Figure 3This is a schematic diagram of the composition structure of another control device for a combiner box provided in an embodiment of the present utility model.

[0021] Figure 4 A schematic diagram of the composition structure of another control device for a combiner box provided in an embodiment of this utility model.

[0022] Figure 5 This is a schematic diagram of the composition structure of a junction box provided in an embodiment of the present utility model.

[0023] Figure 6 This is a schematic diagram of an optional power supply system provided for an embodiment of the present utility model.

[0024] Reference numerals in the attached diagram: 1-Combiner box; 11-First power supply line; 1-n~mn-First power supply line; 11-1~11-n-First power supply line; 12-First current sensor; 13-First switching circuit; 13-1~13-n-1-Switching module; 14-Second power supply line; 14-1~14-n-Second power supply line; 15-Second current sensor; 16-Second switching circuit; 16-1~16-n-1-Switching module; 17-Communication interface; 18-Wireless communication module; 19-Circuit breaker. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings. Throughout the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0026] To enable those skilled in the art to better understand the solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. In the embodiments of this utility model, it should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0027] Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0028] In the description of the embodiments of this utility model, the words "example" or "for example" are used to indicate exemplification, illustration, or description. Any embodiment or design described as "example" or "for example" in the embodiments of this utility model is not to be construed as being more preferred or having more advantages than another embodiment or design. The use of the words "example" or "for example" is intended to present relative concepts in a clear manner. Furthermore, "multiple" in the embodiments of this utility model refers to two or more; therefore, "multiple" can also be understood as "at least two" in the embodiments of this utility model. "At least one" can be understood as one or more, for example, one, two, or more. For example, including at least one means including one, two, or more, and is not limited to which ones are included. For example, including at least one of A, B, and C, then it can include A, B, C, A and B, A and C, B and C, or A and B and C.

[0029] It should be noted that in this embodiment of the invention, "and / or" describes the relationship between the associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / ", unless otherwise specified, generally indicates that the preceding and following associated objects have an "or" relationship. It should also be noted that the electrical connection between two electrical components in this embodiment of the invention can be a direct or indirect electrical connection between the two electrical components. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0030] Furthermore, the names of the messages or information exchanged between the multiple devices in the embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of these messages or information.

[0031] The design concept of this utility model embodiment is briefly introduced below:

[0032] The existing combiner box hardware cannot be upgraded. If a user chooses a basic combiner box and wants to upgrade to a more complex one, they must purchase a new combiner box with more complex hardware. This not only fails to effectively utilize the lifespan of the basic combiner box but also increases the cost of upgrading. Furthermore, if the combiner box hardware malfunctions, the non-removable hardware makes it difficult to quickly locate the faulty component, necessitating a complete replacement of the combiner box, further increasing maintenance costs.

[0033] Therefore, in order to reduce the upgrade and maintenance costs of combiner boxes, this utility model embodiment provides a control device for combiner boxes. (See also...) Figure 1 As shown, the combiner box 1 may include: a first power supply line 11, a first current sensor 12 electrically connected to the first power supply line 11, and a first switching circuit 13. The first switching circuit 13 can be used to turn the first power supply line 11 on or off, and the first current sensor 12 can be used to sample the first current of the first power supply line 11 and generate a first current sampling signal Sam.signal.1. It is understood that the first power supply line 11 may include: multiple first power supply lines (i.e., first power supply line 11-1 to first power supply line 11-n), and the aforementioned first current sampling signal can be used to indicate the current magnitude of the first sub-current corresponding to each of the multiple first power supply lines (i.e., first power supply line 11-1 to first power supply line 11-n). It should be noted that one end of the first power supply line 11 is connected to the first current input interface of the combiner box 1 (not shown in the diagram). Figure 1 (As shown in the diagram) Electrical connection, the first current input interface can be used to connect to the power supply current provided by the current input device (e.g., power supply equipment) on the current input side, and the other end of the first power supply line 11 is connected to the first current output interface (not shown in the diagram) of the combiner box 1. Figure 1 (As shown in the figure) Electrical connection, the first current input interface can be used to transmit the power supply current provided by the current input device to the current output device (e.g., electrical equipment) on the current output side, so as to realize the power supply of the current output device.

[0034] The control device 2 is detachably connected to the junction box 1, meaning that the control device 2 is a plug-and-play control device (or a removable control device). As before... Figure 1 As shown, the control device 2 may include a first interface 21, a second interface 22, and a first control circuit 23. The first interface 21 is electrically connected to the first current sensor 12, the second interface 22 is electrically connected to the control terminal of the first switching circuit 13, and the first control circuit 23 is electrically connected to both the first interface 21 and the second interface 22.

[0035] The first control circuit 23 can be used to receive a first current sampling signal through the first interface 21, generate a first switch control signal Con.signal.1 based on the first current sampling signal, and transmit the first switch control signal to the first switch circuit 13 through the second interface 22, so as to realize the on / off control of the first power supply line 11 by the first switch circuit 13.

[0036] In one alternative implementation, the first control circuit 23 may generate a first switch control signal when the magnitude of the first current indicated by the first current sampling signal is not a preset first current threshold for the first power supply line 11. The aforementioned first switch control signal is used to instruct the first switch circuit 13 to disconnect the first power supply line 11.

[0037] For example, if the magnitude of the first current flowing through the first power supply line 11 is 0.48A and the preset first current threshold for the first power supply line 11 is 0.5A, then it can be determined that the magnitude of the first current indicated by the first current sampling signal is not the preset first current threshold for the first power supply line 11. At this time, the first control circuit 23 can generate a first switch control signal to disconnect the first power supply line 11, so as to ensure the safety of current transmission in the combiner box 1 and prevent abnormal equipment from being connected.

[0038] Optionally, the first control circuit 23 can also generate the aforementioned first switch control signal when the magnitude of the first sub-current flowing through the first power supply line included in the first power supply line 11, as indicated by the first current sampling signal, is not a preset first sub-current threshold for that first power supply line. In other words, once the magnitude of the first sub-current flowing through the first power supply line, as indicated by the first current sampling signal, is not a preset first sub-current threshold for that first power supply line, a first switch control signal for disconnecting the first power supply line 11 can be generated. By employing this method, the safety of current transmission in the combiner box 1 is further ensured by verifying the current magnitude of each first power supply line included in the first power supply line 11.

[0039] It is understood that the first control circuit 23 may include multiple sub-circuits, and this embodiment of the present invention does not limit this. For example, the first control circuit 23 may include a signal processing sub-circuit and a signal generation sub-circuit. The signal processing sub-circuit can receive and process a first current sampling signal, converting the first current sampling signal (e.g., an analog current sampling signal) into a target current sampling signal of a specific form (e.g., a digital current sampling signal). The signal generation sub-circuit can generate a first switch control signal based on the first current sampling signal and transmit the first switch control signal to the first switch circuit 13.

[0040] based on Figure 1The control device 2 shown for the combiner box 1 is detachably connected to the combiner box 1. Furthermore, by providing a first interface 21 electrically connected to the first current sensor 12 of the combiner box 1 and a second interface 22 electrically connected to the first switching circuit 13 of the combiner box 1, the first control circuit 23 of the control device 2 can receive a first current sampling signal through the first interface 21, generate a first switching control signal based on the first current sampling signal, and transmit the first switching control signal to the first switching circuit 13 of the combiner box 1 through the second interface 22.

[0041] In this way, the core functions of combiner box 1 (such as switch control (or the on / off function of power supply line)) are set on the detachable control device 2, which effectively solves the problem that the hardware of existing combiner boxes cannot be disassembled and can only be replaced by replacing the whole unit, so as to realize the upgrade and maintenance of combiner boxes and reduce the upgrade and maintenance costs of combiner boxes.

[0042] In one alternative implementation, see [link to relevant documentation]. Figure 2 As shown, the combiner box 1 may further include: a second power supply line 14, a second current sensor 15 electrically connected to the second power supply line 14, and a second switching circuit 16. The first end of the first power supply line 11 is electrically connected to the second power supply line 14. Of course, there may be no electrical connection between the first power supply line 11 and the second power supply line 14; this embodiment of the invention does not specifically limit this.

[0043] It should also be noted that one end of the second power supply line 14 is connected to the second current input interface of the combiner box 1 (not in...). Figure 2 (As shown in the diagram) Electrical connection, the second current input interface can be used to connect to the power supply current provided by the current input device (e.g., power supply equipment) on the current input side, and the other end of the second power supply line 14 is connected to the second current output interface (not shown in the diagram) of the combiner box 1. Figure 2 (As shown in the figure) Electrical connection, the second current input interface can be used to transmit the power supply current provided by the current input device to the current output device (e.g., electrical equipment) on the current output side, so as to realize the power supply of the current output device.

[0044] The second switching circuit 16 can be used to turn the second power supply line 14 on or off, and the second current sensor 15 can be used to sample the second current of the second power supply line 14 and generate a second current sampling signal Sam.signal.2. It is understood that the second power supply line 14 may also include multiple second power supply lines (i.e., second power supply lines 14-1 to 14-n). In this case, the electrical connection between the first end of the first power supply line 11 and the second power supply line 14 can be such that multiple first power supply lines and multiple second power supply lines correspond one-to-one. The aforementioned second current sampling signal can be used to indicate the magnitude of the second sub-current corresponding to each of the multiple second power supply lines (i.e., second power supply lines 14-1 to 14-n).

[0045] Still Figure 2 As shown, the control device 2 may further include: a third interface 24, a fourth interface 25, and a second control circuit 26. The third interface 24 is electrically connected to the second current sensor 15, the fourth interface 25 is electrically connected to the control terminal of the second switching circuit 16, and the second control circuit 26 is electrically connected to both the third interface 24 and the fourth interface 25.

[0046] The second control circuit 26 can be used to receive the second current sampling signal through the third interface 24, generate the second switch control signal Con.signal.2 based on the second current sampling signal, and transmit the second switch control signal to the second switch circuit 16 through the fourth interface 25, so as to realize the on / off control of the second power supply line 14 by the second switch circuit 16.

[0047] In one alternative implementation, the second control circuit 26 can be used to generate a second switch control signal when the magnitude of the second current indicated by the second current sampling signal is not a preset second current threshold for the second power supply line 14. The aforementioned second switch control signal is used to instruct the second switch circuit 16 to disconnect the second power supply line 14.

[0048] For example, if the magnitude of the second current flowing through the second power supply line 14 is 0.72A and the preset second current threshold for the second power supply line 14 is 0.6A, then it can be determined that the magnitude of the second current indicated by the second current sampling signal is not the preset second current threshold for the second power supply line 14. In this case, the second control circuit 26 can generate a second switch control signal to disconnect the second power supply line 14, ensuring the safety of current transmission in the combiner box 1 and preventing the connection of abnormal equipment.

[0049] Optionally, the second control circuit 26 can also be used to generate the aforementioned second switch control signal when the second current sampling signal indicates that the magnitude of the second sub-current flowing through the second power supply line included in the second power supply line 14 is not a preset second sub-current threshold for that second power supply line. In other words, once the second current sampling signal indicates that the magnitude of the second sub-current flowing through the second power supply line is not a preset second sub-current threshold for that second power supply line, a second switch control signal for disconnecting the second power supply line 14 can be generated. By using this method, the safety of current transmission in the combiner box 1 is further ensured by verifying the current magnitude of each second power supply line included in the second power supply line 14.

[0050] Similarly, the second control circuit 26 may also include multiple sub-circuits. For example, the second control circuit 26 may include a signal processing sub-circuit and a signal generation sub-circuit. The signal processing sub-circuit can receive and process the second current sampling signal, converting it into a target current sampling signal of a specific form. The signal generation sub-circuit can generate a second switching control signal based on the second current sampling signal and transmit the second switching control signal to the second switching circuit 16.

[0051] Furthermore, the first control circuit 23 and the second control circuit 26 can be the same control circuit, that is, the first control circuit 23 and the second control circuit 26 can be integrated into a single control circuit. Of course, the first control circuit 23 and the second control circuit 26 can also be... Figure 2 The two control circuits shown are separately configured, but this embodiment of the present invention does not limit the scope of the invention.

[0052] It should be noted that the first switching circuit 13 may include switching modules (i.e., switching modules 13-1 to 13-n-1) respectively provided for the first power supply lines (e.g., first power supply lines 11-1 to 11-n-1) in the first power supply line 11. The second switching circuit 16 may include switching modules (i.e., switching modules 16-1 to 16-n-1) respectively provided for a portion of the power supply lines (e.g., second power supply lines 14-1 to 14-n-1) in the second power supply line 14. The switching modules may be adapters or disconnect switches, etc., and this embodiment of the present invention does not limit this.

[0053] In one alternative implementation, such as Figure 2 As shown, the second end of the first power supply line 11 is electrically connected to the inverter, the first end of the first power supply line 14 is electrically connected to or connected to the second power supply line 14, the first end of the second power supply line 14 is electrically connected to the power grid, and the second end of the second power supply line is electrically connected to the load (e.g., a charging pile).

[0054] Therefore, current transfer between the inverter, the power grid, and the load can be achieved through the first power supply line 11 and the second power supply line 14. Assuming the power grid is the current input side and the inverter or load is the current output side, the power grid can transfer a first current to the inverter through the first power supply line 11 and the second power supply line 14, or a second current to the load through the second power supply line 14. For example, assuming the inverter is the current input side and the power grid or load is the current output side, the inverter can transfer a first current to the inverter or the load through the first power supply line 11 and the second power supply line 14.

[0055] In one alternative implementation, it is still as follows Figure 2 As shown, the first current sensor 12 and the first switching circuit 13 are located between the connection node of the first power supply line 11 and the second power supply line 14 (i.e., the connection node of the first power supply line 11-1 to the first power supply line 11-n and the second power supply line 14-1 to the second power supply line 14-n, i.e., Node 1 to Node n) and the inverter. And / or, the second current sensor 15 and the second switching circuit 16 are located between the connection node of the first power supply line 11 and the second power supply line 14 (i.e., Node 1 to Node n) and the load.

[0056] At this time, the first control circuit 23 can also be used to generate a third switch control signal, Con.signal.3, when the grid supplies power to the load. This third switch control signal can be used to instruct the first switch circuit 13 to disconnect the first power supply line 11. The second control circuit 26 can also be used to generate a fourth switch control signal, Con.signal.4, when the inverter supplies power to the grid. This fourth switch control signal can be used to instruct the second switch circuit 16 to disconnect the second power supply line 14.

[0057] Based on the above method, by means of the positional distribution of the first current sensor 12 and the first switching circuit 13 in the circuit, the first control circuit 23 can promptly disconnect the current transmission line (i.e., the first power supply line 11) between the power grid and the inverter when it determines that the power grid is supplying power to the load. By means of the positional distribution of the second current sensor 15 and the second switching circuit 16 in the circuit, the second control circuit 26 can promptly disconnect the current transmission line (i.e., the second power supply line 14) between the connection node (i.e., Node 1 to Node n) of the first power supply line 11 and the second power supply line 14 and the load when it determines that the inverter is supplying power to the power grid. This ensures that only one electrical device exists in the combiner box 1, thereby improving the safety of the combiner box 1.

[0058] In one alternative implementation, it is still as follows Figure 2As shown, the first power supply line 11 may include multiple first power supply lines (i.e., first power supply lines 1-n to first power supply lines mn). The multiple first power supply lines (i.e., first power supply lines 1-n to first power supply lines mn) are electrically connected to the first current sensor 12 and the first switching circuit 13, respectively.

[0059] Each first power supply circuit may include two power supply lines. One of the aforementioned two power supply lines is a phase line (or live wire), and the other of the aforementioned two power supply lines is a neutral line (or neutral wire).

[0060] In this way, the first current sensor 12 can be used to detect the current of multiple power supply lines (i.e., the first power supply line 1-n to the first power supply line mn), and the first switching circuit 13 can be used to control the on / off state of multiple power supply lines (i.e., the first power supply line 1-n to the first power supply line mn).

[0061] In one optional implementation, one of the two power supply lines of different power supply circuits may be different or the same, while the other power supply line of different power supply circuits may be the same. Therefore, there is no explicit size relationship between the number of power supply circuits included in the first power supply circuit 11 and the number of first power supply lines included in the first power supply circuit 11; that is, the number of power supply circuits can be less than, equal to, or greater than the number of first power supply lines. This embodiment of the present invention does not limit this. Figure 2 As shown, the first power supply line 1-n and the first power supply line 2-n include different phase lines (i.e., the first power supply line 11-1 and the first power supply line 11-2) and the same neutral line (i.e., the first power supply line 11-n), and the first power supply line m-1-n and the first power supply line mn include the same phase line (i.e., the first power supply line 11-n-1) and the same neutral line (i.e., the first power supply line 11-n).

[0062] In one alternative implementation, see [link to relevant documentation]. Figure 3 As shown, the control device 2 may further include a power supply circuit 27. The power supply circuit 27 may be electrically connected to the first power supply line 11 and / or the second power supply line 14.

[0063] The power supply circuit 27 can be used to draw power from the first power supply line 11 and / or the second power supply line 14 and supply power to the control device 2. For example... Figure 3 As shown, the power supply circuit 27 can be electrically connected to the second power supply line 14 and is used to draw power from the second power supply line 14 and supply power to the control device 2. It should be understood that the process of the power supply circuit 27 drawing power from the second power supply line 14 and supplying power to the control device 2 includes: AC power drawing, AC-DC conversion, and generating supply voltage (or supply current).

[0064] Optionally, the power supply circuit 27 is electrically connected to the second power supply line 14-1 and the second power supply line 14-n in the second power supply line 14. That is, the power supply circuit 27 can receive the first electrical signal Elect.Signal.1 from the second power supply line 14-1 and the second electrical signal Elect.Signal.2 from the second power supply line 14-n, and generate a power supply signal for the control device 2 based on the first and second electrical signals. For example, assuming the first electrical signal is a first voltage, it can be represented as V1, and the second electrical signal is a second voltage, it can be represented as V2. Then, the aforementioned power supply signal can be the voltage difference obtained based on the first voltage and the second electrical signal, and can be represented as V... EN =|V1-V2|.

[0065] This approach eliminates the need for an additional auxiliary power supply to power the control device 1, integrating the auxiliary power supply function into the detachable control device 1 and reducing the circuit complexity of the control device 1.

[0066] In one alternative implementation, it is still as follows Figure 3 As shown, the combiner box 1 may further include a communication interface 17, and the control device 2 may further include a first communication circuit 28 and / or a second communication circuit 29. The first communication circuit 28 is electrically connected to the first control circuit 23 and / or the second control circuit 26, and the second communication circuit 29 is electrically connected to the first control circuit 23 and / or the second control circuit 26. The first communication circuit 28 can be used for wired communication with external devices (e.g., terminals) through the communication interface 17; and / or, the second communication circuit 29 can be used for wireless communication with external devices. Figure 3 As shown, the combiner box 1 may also include a wireless communication module 18 (e.g., an external antenna) for wireless communication with external devices.

[0067] Based on the above method, the communication function (i.e. wireless communication function and / or wired communication function) is integrated into the detachable control device 1, which reduces the upgrade cost and maintenance cost of the combiner box 1.

[0068] In one alternative implementation, it is still as follows Figure 3 As shown, the junction box 1 may further include a circuit breaker 19 disposed on the side near the load. The circuit breaker 19 is electrically connected to the second power supply line 14. The circuit breaker 19 can be used to disconnect the second power supply line 14 when an overload, short circuit, or leakage is detected in the second power supply line 14.

[0069] It should be understood that when the circuit breaker 19 detects an overload, short circuit, or leakage in the second power supply line 14, it may disconnect part or all of the second power supply lines in the second power supply line 14. This embodiment of the present invention does not specifically limit this. For example, when the circuit breaker 19 detects an overload or short circuit in the second power supply line 14, it may disconnect all of the second power supply lines in the second power supply line 14; and when it detects a leakage in the second power supply line 14, it may disconnect part of the second power supply lines in the second power supply line 14.

[0070] Based on the control device 2 for the junction box 1 described above, see... Figure 4 As shown, taking a three-phase four-wire AC power supply system in combiner box 1 as an example, both the first power supply line 11 and the second power supply line 14 include four power supply lines (in order: phase line R, phase line S, phase line T, and neutral line N). The first power supply line 11 includes four first power supply circuits (i.e., first power supply circuit RN, first power supply circuit SN, and two first power supply circuits TN). Switch module A and switch module B are installed on phase line R, switch module C and switch module D are installed on phase line S, and switch module E, switch module F, and switch module G are installed on phase line T. Switch module E and switch module F are connected in parallel on two sub-lines of phase line T. The control device 1 can be a printed circuit board (PCB). The PCB can control the on / off switching of switch modules A, C, E, and F based on the first current sampling signal obtained by the first current sensor 12 sampling current of phase lines R, S, T, and neutral line N. Similarly, it can control the on / off switching of switch modules B, D, and G based on the second current sampling signal obtained by the second current sensor 15 sampling current of phase lines R, S, T, and neutral line N. Combiner box 1 enables current transmission between the inverter, the power grid, and the load (e.g., charging station 1 and charging station 2) via phase lines R, S, T, and neutral line N. Figure 4As shown, combiner box 1 can supply three-phase AC power to charging pile 1 via phase lines R, S, T, and neutral line N in the second power supply line 14, and can also supply single-phase AC power to charging pile 2 via phase line T and neutral line N in the second power supply line 14. Optionally, combiner box 1 can also supply single-phase AC power to charging pile 2 via one phase line (i.e., phase line R, phase line S, or phase line T) and neutral line N in the first power supply line 14, or via phase line R (or phase line S) and neutral line N in the second power supply line 14. This embodiment of the present invention does not specifically limit this. Furthermore, the PCB can also perform wired communication with external devices via communication terminal a (i.e., communication interface 17), and wireless communication with external devices via external antenna b.

[0071] In addition, the PCB can also draw power from the R and N lines to ensure the normal operation of the PCB. The combiner box 1 can also include a circuit breaker with leakage protection capability that is electrically connected to the phase line R, phase line S, phase line T and neutral line N in the second power supply line 14 to realize short circuit, overload and leakage protection in the second power supply line 14.

[0072] In summary, the control device for combiner boxes provided in this embodiment of the present invention integrates multiple core functions of the combiner box (such as switch control, auxiliary power supply, communication function, etc.) into a detachable control device, effectively solving the problem that the hardware of existing combiner boxes cannot be disassembled and can only be replaced by replacing the entire unit, thereby reducing the upgrade and maintenance costs of the combiner box.

[0073] Furthermore, based on the same technical concept, this utility model embodiment provides a junction box. See also... Figure 5 As shown, the combiner box 1 may include: a first power supply line 11, a first current sensor 12 and a first switch circuit 13 electrically connected to the first power supply line 11, a second power supply line 14, a second current sensor 15 and a second switch circuit 16 electrically connected to the second power supply line 14, a communication interface 17, a wireless communication module 18 and a circuit breaker 19.

[0074] Among them, such as Figure 1-4 The control device 2 shown is detachably connected to the first current sensor 12, the first switching circuit 13, the second current sensor 15, and the second switching circuit 16 sequentially via the first interface 21, the second interface 22, the third interface 24, and the fourth interface 26. Furthermore, the control device 2 is wired and detachably connected to the communication interface 17, and wirelessly connected to the wireless communication module 18. The circuit breaker 19 is electrically connected to the second power supply line 14.

[0075] In one alternative implementation, the first power supply line 11 may include: a plurality of first power supply lines (such as...) Figure 4 The diagram shows the first power supply line RN, the first power supply line SN, and two first power supply lines TN. These multiple first power supply lines are electrically connected to the first current sensor 12 and the first switching circuit 13, respectively.

[0076] Each first power supply circuit may include two power supply lines. One of the aforementioned two power supply lines is a phase line, and the other of the aforementioned two power supply lines is a neutral line.

[0077] In one alternative implementation, it is still as follows Figure 5 As shown, the first current sensor 12 and the first switching circuit 13 are located between the connection node of the first power supply line 11 and the second power supply line 14 and the inverter. And / or, the second current sensor 15 and the second switching circuit 16 are located between the connection node of the first power supply line 11 and the second power supply line 14 and the load.

[0078] In one alternative implementation, the load may include a first charging pile and a second charging pile. The combiner box 1 can be used to supply three-phase AC power to the first charging pile and can be used to supply single-phase AC power to the second charging pile.

[0079] Still Figure 4 As shown, charging pile 1 (i.e., the first charging pile) can be electrically connected to phase lines R, S, T, and neutral line N of the second power supply line 14 in combiner box 1. In this case, combiner box 1 can supply three-phase AC power to charging pile 1 through phase lines R, S, T, and N of the second power supply line 14. Similarly, charging pile 2 (i.e., the second charging pile) can be electrically connected to phase line T and neutral line N of the second power supply line 14 in combiner box 1. In this case, combiner box 1 can supply single-phase AC power to charging pile 2 through phase lines T and N of the second power supply line 14.

[0080] Optionally, the combiner box 1 can also supply single-phase AC power to the charging pile 2 through one phase line (i.e., phase line R, phase line S or phase line T) and neutral line N in the first power supply line 14, or supply single-phase AC power to the charging pile 2 through phase line R (or phase line S) and neutral line N in the second power supply line 14. This embodiment of the utility model does not specifically limit this.

[0081] This utility model embodiment also provides a power supply system. See reference... Figure 6 As shown, the power supply system X may include: Figure 1-5 As shown in junction box 1, Figure 1-4The diagram shows a control device 2, a current input device 3, and a current output device 4. The current input device 3 is electrically connected to the current input interface A (i.e., the input terminal) of the combiner box 1, and the current output device 4 is electrically connected to the current output interface B (i.e., the output terminal) of the combiner box 1. The control device 2 is detachably connected to the combiner box 1. The combiner box 1 is used to transmit the power supply current provided by the current input device 3 to the current output device 4.

[0082] Furthermore, it should be understood that the above-disclosed embodiments are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution described in the present utility model shall still fall within the scope of the present utility model.

Claims

1. A control device for a combiner box, characterized in that, The combiner box includes a first power supply line, a first current sensor electrically connected to the first power supply line, and a first switching circuit. The first switching circuit is used to turn the first power supply line on or off, and the first current sensor is used to sample the first current of the first power supply line and generate a first current sampling signal. The control device is detachably connected to the combiner box, and the control device includes: The first interface is used for electrical connection with the first current sensor; The second interface is used for electrical connection with the control terminal of the first switching circuit; A first control circuit, electrically connected to the first interface and the second interface, is used to receive the first current sampling signal through the first interface, generate a first switch control signal based on the first current sampling signal, and transmit the first switch control signal to the first switch circuit through the second interface.

2. The control device as described in claim 1, characterized in that, The first control circuit is configured to generate the first switch control signal when the magnitude of the first current indicated by the first current sampling signal is not a first current threshold preset for the first power supply line. The first switch control signal is used to instruct the first switch circuit to disconnect the first power supply line.

3. The control device as described in claim 1, characterized in that, The combiner box further includes a second power supply line, a second current sensor electrically connected to the second power supply line, and a second switching circuit. A first end of the first power supply line is electrically connected to the second power supply line. The second switching circuit is used to turn the second power supply line on or off. The second current sensor is used to sample the second current of the second power supply line and generate a second current sampling signal. The control device further includes: The third interface is used for electrical connection with the second current sensor; The fourth interface is used for electrical connection with the control terminal of the second switching circuit; The second control circuit, electrically connected to the third interface and the fourth interface, is used to receive the second current sampling signal through the third interface, generate a second switch control signal based on the second current sampling signal, and transmit the second switch control signal to the second switch circuit through the fourth interface.

4. The control device as described in claim 3, characterized in that, The second control circuit is used to generate the second switch control signal when the magnitude of the second current indicated by the second current sampling signal is not a second current threshold preset for the second power supply line. The second switch control signal is used to instruct the second switch circuit to disconnect the second power supply line.

5. The control device as described in claim 3, characterized in that, The second end of the first power supply line is electrically connected to the inverter, the first end of the second power supply line is electrically connected to the power grid, and the second end of the second power supply line is electrically connected to the load. The first control circuit is further configured to generate a third switch control signal when the power grid supplies power to the load; the third switch control signal is configured to instruct the first switch circuit to disconnect the first power supply line. The second control circuit is further configured to generate a fourth switch control signal when the inverter supplies power to the grid; the fourth switch control signal is used to instruct the second switch circuit to disconnect the second power supply line.

6. The control device as described in any one of claims 3-5, characterized in that, The control device further includes: A power supply circuit, electrically connected to the first power supply line and / or the second power supply line, is used to draw power from the first power supply line and / or the second power supply line and supply power to the control device.

7. The control device as described in any one of claims 3-5, characterized in that, The combiner box also includes a communication interface, and the control device also includes: A first communication circuit, electrically connected to the first control circuit and / or the second control circuit, is used for wired communication with external devices through the communication interface; and / or The second communication circuit, electrically connected to the first control circuit and / or the second control circuit, is used for wireless communication with the external device.

8. A junction box, characterized in that, The combiner box is detachably connected to a control device for the combiner box as described in any one of claims 1-7, and the combiner box comprises: First power supply line; A first current sensor is electrically connected to the first power supply line and is used to sample the first current of the first power supply line and generate a first current sampling signal. The first switching circuit is electrically connected to the first power supply line and is used to turn the first power supply line on or off.

9. The combiner box as described in claim 8, characterized in that, The first power supply line includes: a plurality of first power supply lines, wherein the plurality of power supply lines are electrically connected to the first current sensor and the first switching circuit respectively; Each first power supply circuit includes two power supply lines, one of which is a phase line and the other is a neutral line.

10. The combiner box as described in claim 8, characterized in that, The junction box also includes: The second power supply line is electrically connected to the first end of the first power supply line; The second current sensor is electrically connected to the second power supply line and is used to sample the second current of the second power supply line and generate a second current sampling signal. The second switching circuit is electrically connected to the second power supply line and is used to turn the second power supply line on or off.

11. The combiner box as described in claim 10, characterized in that, The first current sensor and the first switching circuit are located between the connection node of the first power supply line and the second power supply line and the inverter; and / or, The second current sensor and the second switching circuit are located between the connection node of the first power supply line and the second power supply line and the load; The second end of the first power supply line is electrically connected to the inverter, the first end of the second power supply line is electrically connected to the power grid, and the second end of the second power supply line is electrically connected to the load.

12. The combiner box as described in claim 11, characterized in that, The load includes a first charging pile and a second charging pile. The combiner box is used to supply three-phase AC power to the first charging pile and single-phase AC power to the second charging pile.

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