Offline control box
By electrically connecting the circuit board and heat sink in the grid-connected control box and connecting it to a stable potential, the problem of complex wiring is solved, heat dissipation performance and safety are improved, and wiring difficulty and cost are reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI MOOREWATT ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-08-11
- Publication Date
- 2026-07-31
AI Technical Summary
Traditional on-grid and off-grid control boxes have complex wiring, which affects production efficiency and safety.
The heat sink is electrically connected to the circuit board, and the physical and electrical connection is achieved through conductive bolts. The heat sink is connected to a stable potential, reducing the need for grounding wires and simplifying the wiring process.
It improves heat dissipation and electrical safety, reduces wiring complexity and manufacturing costs, and enhances the reliability and safety of the control box.
Smart Images
Figure CN224583383U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of new energy technology, and in particular to a grid-connected and off-grid control box. Background Technology
[0002] Grid-connected / off-grid control boxes play a crucial role in photovoltaic (PV) power plants, serving as a bridge between the PV power plant and the power grid. Due to grid instability and external influences, these control boxes provide various protections and controls to ensure the safe and reliable grid connection of the PV power plant. If a PV power plant experiences a fault or overload, the control box can promptly disconnect it from the grid, preventing unforeseen dangers. Therefore, grid-connected / off-grid control boxes are irreplaceable in ensuring the production, operation, and safety of PV power plants. However, traditional grid-connected / off-grid control boxes often suffer from complex wiring. Utility Model Content
[0003] One of the technical problems addressed by this application is how to reduce the wiring complexity of on-grid and off-grid control boxes.
[0004] A parallel / offline control box, comprising:
[0005] The housing has a receiving cavity;
[0006] A heat sink is disposed within the accommodating cavity; and
[0007] A first circuit board is disposed within the accommodating cavity, and the first circuit board is electrically connected to the heat sink, the heat sink being connected to a stable potential.
[0008] In one embodiment, the first circuit board is connected to the heat sink via conductive bolts.
[0009] In one embodiment, a heat-conducting element is further included, which is disposed between the first circuit board and the heat sink.
[0010] In one embodiment, the heat sink is connected to ground potential.
[0011] In one embodiment, the housing is made of plastic material.
[0012] In one embodiment, a first cover plate is also included, which covers the first circuit board and is detachably connected to the housing.
[0013] In one embodiment, a first operating element located within the accommodating cavity is further included, and an exposure hole is provided on the first cover plate, the orthographic projection of the exposure hole along the thickness direction of the first cover plate covering the first operating element.
[0014] In one embodiment, the device further includes a second operating element and a second cover plate located within the accommodating cavity, the second cover plate being detachably connected to the housing and covering the second operating element.
[0015] In one embodiment, the coverage area of the second cover plate is smaller than the coverage area of the first cover plate, and / or,
[0016] The first operating element is higher than the second operating element in the thickness direction.
[0017] In one embodiment, the device further includes a mounting member and a second circuit board disposed within the accommodating cavity. The mounting member includes a first mounting portion and two second mounting portions. The two second mounting portions are spaced apart and connected to the heat sink. The second circuit board is electrically connected to the first circuit board and located between the two second mounting portions. The first mounting portion is connected to the end of the second mounting portion away from the heat sink, and the first mounting portion is spaced apart from the second circuit board along the thickness direction of the second circuit board.
[0018] The first mounting section has a wire groove for accommodating cables.
[0019] In one embodiment, a cable hub is also included, which protrudes from the wire groove and is used to thread a binding cord capable of securing the cable.
[0020] One technical advantage of one embodiment of this application is that by providing a heat sink, and electrically connecting the first circuit board to the heat sink, the heat generated by the first circuit board can be quickly conducted to the heat sink, allowing the heat sink to quickly dissipate the heat from the first circuit board, ultimately improving the heat dissipation performance of the grid-connected control box. Simultaneously, it avoids heat accumulation on the first circuit board for extended periods, preventing overheating and damage under high temperatures, thus improving the reliability of the grid-connected control box. More importantly, since the heat sink is connected to a stable potential, and the first circuit board is electrically connected to the heat sink, the first circuit board is also connected to a stable potential. This eliminates the need for a grounding wire on the first circuit board, reducing the wiring complexity of the grid-connected control box and improving electrical safety. Attached Figure Description
[0021] Figure 1 This is a three-dimensional structural diagram of a grid-connected / off-grid control box provided in one embodiment.
[0022] Figure 2 for Figure 1 The diagram shows the exploded structure of the on-grid and off-grid control box.
[0023] Figure 3for Figure 1 The diagram shows the three-dimensional structure of the off-grid control box after the mask is removed.
[0024] Figure 4 for Figure 1 The diagram shows a partial three-dimensional structure of the on-grid control box.
[0025] Figure 5 for Figure 1 The diagram shows another partial three-dimensional structure of the on-grid control box.
[0026] Figure 6 for Figure 5 A schematic diagram of its decomposed structure.
[0027] Figure 7 for Figure 4 A schematic diagram of the three-dimensional structure from another perspective.
[0028] Reference numerals: 10 for on / off grid control box, 100 for housing, 110 for accommodating cavity, 120 for base plate, 130 for side wall, 140 for face shield, 200 for heat sink, 300 for first circuit board, 410 for conductive bolt, 420 for heat-conducting component, 430 for grounding bar, 510 for first cover plate, 511 for exposure hole, 520 for first operating element, 610 for second cover plate, 620 for second operating element, 700 for mounting component, 710 for first mounting part, 711 for wire channel, 720 for second mounting part, 810 for second circuit board, 820 for hub. Detailed Implementation
[0029] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0030] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0031] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0033] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0034] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.
[0035] See Figure 1 and Figure 3 One embodiment of this application provides a parallel / offline control box 10, including a housing 100, a heat sink 200, and a first circuit board 300. The housing 100 has a receiving cavity 110 (e.g., Figure 2The heat sink 200 is disposed within the receiving cavity 110. The heat sink 200 may include a heat dissipation aluminum plate, etc., thereby enabling the heat sink 200 to have good heat dissipation function. The first circuit board 300 is disposed within the receiving cavity 110 (e.g., Figure 3 The first circuit board 300 is electrically connected to the heat sink 200. The heat generated by the first circuit board 300 is dissipated through the heat sink 200, which is connected to a stable potential.
[0036] Therefore, by setting up a heat sink 200 and electrically connecting it to the first circuit board 300, the heat generated by the first circuit board 300 can be quickly conducted to the heat sink 200, allowing the heat sink 200 to quickly dissipate the heat from the first circuit board 300, ultimately improving the heat dissipation performance of the grid-connected control box. Simultaneously, it prevents heat from accumulating on the first circuit board 300 for extended periods, thus avoiding overheating and preventing damage to the first circuit board 300 under high temperatures, thereby improving the reliability of the grid-connected control box. Furthermore, since the heat sink 200 is connected to a stable potential, and the first circuit board 300 is electrically connected to the heat sink 200, it is also connected to a stable potential. This eliminates the need for a grounding wire on the first circuit board 300, achieving grounding of the first circuit board 300, thus reducing the wiring complexity of the grid-connected control box 10 and improving electrical safety.
[0037] See Figure 4 In some embodiments, the grid-connected control box 10 further includes a conductive bolt 410, through which the first circuit board 300 and the heat sink 200 are connected. This allows the first circuit board 300 to achieve both a physical and electrical connection with the heat sink 200 via the conductive bolt 410. Therefore, the conductive bolt 410 serves the dual function of physical and electrical connection, avoiding the need for separate components to achieve physical and electrical connections between the first circuit board 300 and the heat sink 200. This reduces the number of components used and assembly difficulty, simplifying the wiring of the grid-connected control box and reducing its manufacturing cost.
[0038] See Figure 4In some embodiments, the off-grid control box 10 further includes a heat-conducting element 420. The heat-conducting element 420 has a high thermal conductivity, enabling it to perform excellent heat dissipation. The heat-conducting element 420 is disposed between the first circuit board 300 and the heat sink 200. For example, the heat-conducting element 420 can be disposed between the first circuit board 300 and the heat sink 200, which can be understood as the first circuit board 300 and the heat sink 200 clamping the heat-conducting element 420. By setting the heat-conducting element 420, the heat on the first circuit board 300 can be quickly transferred to the heat sink 200 through the heat-conducting element 420, and the heat can be evenly distributed on the heat-conducting element 420, ensuring that the heat on the first circuit board 300 is dissipated in a timely manner through the heat sink 200, thereby further improving the heat dissipation effect of the off-grid control box. The heat-conducting component 420 can be made of insulating materials such as thermally conductive silicone, which can effectively prevent specific electronic components on the circuit board corresponding to the heat-conducting component 420 from forming a short circuit with the heat sink 200, thereby further improving the reliability of the off-grid control box 10.
[0039] See Figure 4 In some embodiments, the heat sink 200 is connected to a ground potential, which can serve as a stabilizing potential, thus achieving the grounding function of the heat sink 200. For example, the grid-connected control box 10 may include a grounding busbar 430, which is disposed on the heat sink 200. The heat sink 200 is grounded through the grounding potential of the grounding busbar 430, thus the heat sink 200 integrates a grounding function. Since the first circuit board 300 is electrically connected to the conductive bolt 410 of the heat sink 200 channel, both the first circuit board 300 and the heat sink 200 are grounded through the grounding potential of the grounding busbar 430, thereby ensuring that the entire grid-connected control box 10 is grounded, thus avoiding short circuits and improving the reliability of the grid-connected control box. Since the heat sink 200 achieves grounding function through grounding potential, a large number of grounding cables connecting the grounding potential of the first circuit board 300 and the grounding bus 430 can be saved. This also simplifies the structure of the entire grid connection control box 10, reduces the assembly difficulty of the grid connection control box 10, and ultimately further reduces the manufacturing cost of the grid connection control box 10.
[0040] See Figure 1 In some embodiments, the housing 100 is made of plastic material. This gives the housing 100 excellent insulation properties, preventing leakage current through the housing 100 during operation of the off-grid control box 10, thereby improving the safety of the off-grid control box. At the same time, the plastic housing 100 is lightweight and has a low material cost, thus reducing the manufacturing cost of the off-grid control box 10 while achieving a lightweight design.
[0041] See Figure 2In some embodiments, the housing 100 may include a base plate 120, a side wall 130, and a face mask 140. The side wall 130 protrudes from the base plate 120 and is connected to the periphery of the base plate 120 to surround the base plate 120, such that the base plate 120 and the side wall 130 form a receiving cavity 110. The face mask 140 may be movably connected to the side wall 130, thereby allowing the face mask 140 to open or close the receiving cavity 110. For example, one end of the face mask 140 may be rotatably connected to the side wall 130, and the other end of the face mask 140 may be detachably connected to the side wall 130 by means of a snap-fit connection or other means. During use, the connection between the other section of the mask 140 and the side wall 130 can be released, allowing the mask 140 to rotate away from the side wall 130. This allows the mask 140 to open the receiving cavity 110, enabling maintenance of the components within the receiving cavity 110, thus improving the convenience of maintenance for the off-grid control box 10. With the mask 140 open in the receiving cavity 110, it can be rotated closer to the side wall 130 until it completely closes the receiving cavity 110. When the mask 140 closes the receiving cavity 110, the other section of the mask 140 remains connected to the side wall 130, thereby improving the stability and reliability of the mask 140 in closing the receiving cavity 110. In other embodiments, the mask 140 can also open or close the receiving cavity 110 by sliding its connection to the side wall 130.
[0042] See Figure 5 In some embodiments, the grid connection / offline control box 10 further includes a first cover plate 510. The first cover plate 510 can be located within the accommodating cavity 110, so that the face shield 140 is closer to the first cover plate 510 relative to the base plate 120. The first cover plate 510 is located above the first circuit board 300, so that the first cover plate 510 can cover the first circuit board 300, thereby protecting the first circuit board 300 and the electronic components on the first circuit board 300. When the face shield 140 opens the accommodating cavity 110, it also prevents the electronic components on the first circuit board 300 from interfering with the user. The first cover plate 510 is detachably connected to the housing 100, for example, the first cover plate 510 is snap-fitted to the side wall 130 or bolted to it. When the first cover plate 510 is unloaded from the housing 100, the components below the first cover plate 510 can be maintained, thereby improving the convenience of maintenance of the grid connection / offline control box 10.
[0043] See Figure 6In some embodiments, the grid connection control box 10 further includes a first operating element 520 located within the accommodating cavity 110. The first operating element 520 can be directly connected to the base plate 120 or slidably connected to a slide rail mounted on the base plate 120. An exposure hole 511 is provided on the first cover plate 510. The orthographic projection of the exposure hole 511 along the thickness direction of the first cover plate 510 covers the first operating element 520. For example, the exposure hole 511 can be positioned above the first operating element 520, or the first operating element 520 can pass through the exposure hole 511. In short, it allows the first operating element 520 to be exposed through the exposure hole 511, preventing the first cover plate 510 from completely covering the first operating element 520. When the mask 140 opens the accommodating cavity 110, there is no need to disassemble the first cover plate 510, allowing the user to directly operate the exposed first operating element 520 through the exposure hole 511, thereby improving the ease of operation of the grid connection control box 10.
[0044] See Figure 6 In some embodiments, the off-grid control box 10 further includes a second operating element 620 and a second cover plate 610. Both the second operating element 620 and the second cover plate 610 are located within the accommodating cavity 110. The second operating element 620 may also be connected to the base plate 120 and may include the aforementioned grounding bar 430. The face shield 140 is closer to the second cover plate 610 than the base plate 120, and the second cover plate 610 is located above the second operating element 620, so that the second cover plate 610 can completely cover the second operating element 620. The second cover plate 610 is detachably connected to the side wall 130, for example, by a snap-fit connection or a bolt connection. When the face shield 140 opens the accommodating cavity 110, with the second cover plate 610 connected to the side wall 130, the user cannot observe or contact the second operating element 620. When the user needs to operate the second operating element 620, the second cover plate 610 can be unloaded from the side wall 130 first, and then the second operating element 620 can be operated.
[0045] It is understood that the user operates the first operating element 520 more frequently than the second operating element 620. Therefore, when the cover 140 opens the accommodating cavity 110, the user can directly operate the first operating element 520 without repeatedly disassembling the first cover 510, thus improving the convenience of operating the on / offline control box 10. Simultaneously, during the operation of the first operating element 520, since the second cover 610 covers the second operating element 620, it can prevent the user from mistaking the second operating element 620 for the first operating element 520, thereby improving the accuracy of operation. Furthermore, it can prevent interference from the second operating element 620 during the user's operation of the first operating element 520, further improving the convenience of operation and preventing damage to the second operating element 620. For example, the first operating element 520 can be an air switch, and the second operating element 620 can be a terminal block.
[0046] See Figure 6 In some embodiments, the coverage area of the second cover plate 610 is smaller than that of the first cover plate 510. This can reasonably reduce the weight of the second cover plate 610, thereby improving the ease of assembly and disassembly of the second cover plate 610. It also allows the first cover plate 510, with its larger coverage area, to protect more components. The first operating element 520 is thicker than the second operating element 620, which can be understood as the first operating element 520 being closer to the face shield 140 than the second operating element. This allows the user to operate the first operating element 520, which has a relatively high operating frequency, with a smaller depth of insertion into the receiving cavity 110, thereby improving the ease of operation of the on-grid control box 10.
[0047] It is understandable that when the grid connection / offline control box 10 leaves the factory, the first cover plate 510 is already connected to the side wall 130 and covers the first operating element 520. Considering that the second operating element 620 needs to be wired at the installation site, after the wiring of the second operating element 620 is completed, the second cover plate 610 is connected to the side wall 130 at the installation site and covers the wired second operating element 620. Therefore, the second cover plate 610 does not need to be connected to the side wall 130 at the factory, which avoids repeated disassembly of the second cover plate 610, thereby improving the ease of operation of the grid connection / offline control box 10. (See also...) Figure 7In some embodiments, the on / off grid control box 10 further includes a mounting component 700 and a second circuit board 810. Both the mounting component 700 and the second circuit board 810 are located within the accommodating cavity 110. The second circuit board 810 is electrically connected to the first circuit board 300. Similar to the first circuit board 300, the second circuit board 810 can also be physically and electrically connected to the heat sink 200 via conductive bolts 410. Furthermore, the heat-conducting component 420 can be stacked between the second circuit board 810 and the first circuit board 300, allowing the second circuit board 810 to quickly conduct heat to the heat sink 200 for rapid heat dissipation and cooling. The mounting component 700 includes a first mounting portion 710 and two second mounting portions 720. The first mounting portion 710 is generally horizontally positioned, and the two second mounting portions 720 are generally vertically positioned. The two second mounting portions 720 are spaced apart from each other and connected to the heat sink 200, for example, by bolts. The second circuit board 810 is located in the space between the two second mounting portions 720. The first mounting portion 710 is connected to the end of the second mounting portion 720 away from the heat sink 200. The first mounting portion 710 is spaced apart from the second circuit board 810 along the thickness direction, which can be understood as the first mounting portion 710 spanning above the second circuit board 810. A wire groove 711 is provided on the first mounting portion 710 to accommodate cables that can be connected to the first operating element 520. Therefore, by accommodating the wire in the wire groove 711 of the first mounting portion 710, the cable is positioned above the second circuit board 810, avoiding short circuits caused by contact between the cable and the second circuit board 810, thereby improving the reliability of the on-grid control box 10.
[0048] Since the second circuit board 810 is electrically connected to the first circuit board 300 and the heat sink 200, and is also connected to a stable potential, the grounding wire on the second circuit board 810 can be saved to achieve grounding of the second circuit board 810. This can also reduce the wiring complexity of the grid-connected control box 10, thereby reducing the manufacturing cost of the grid-connected control box 10.
[0049] See Figure 7In some embodiments, the parallel / offline control box 10 further includes a cable hub 820, which protrudes from the wire channel 711 and is used to thread a binding rope through it, which can bind the cable. For example, both ends of the cable hub 820 are connected to the bottom wall of the wire channel 711, and the protruding part in the middle of the cable hub 820 is spaced apart from the bottom wall of the wire channel 711, so that a wire passage space is formed between the cable hub 820 and the bottom wall of the wire channel 711. The binding rope can be threaded through this wire passage space, and the cable hub 820 can provide a certain degree of restraint for the binding rope, preventing the binding rope from moving significantly relative to the first mounting part 710. The extension direction of the binding rope can be approximately perpendicular to the extension direction of the cable in the wire channel 711, thereby improving the binding effect of the binding rope on the cable, preventing the cable from detaching from the wire channel 711 and contacting the second circuit board 810, and further improving the reliability of the parallel / offline control box 10.
[0050] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0051] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A grid tied control box characterized in that, include: The housing has a receiving cavity; A heat sink is disposed within the accommodating cavity; and A first circuit board is disposed within the accommodating cavity, and the first circuit board is electrically connected to the heat sink, the heat sink being connected to a stable potential.
2. The off-grid control box of claim 1, wherein, The first circuit board is connected to the heat sink via conductive bolts.
3. The off-grid control box of claim 1, wherein, It also includes a heat-conducting component, which is disposed between the first circuit board and the heat sink.
4. The off-grid control box of claim 1, wherein, The heat sink is connected to the ground potential.
5. The off-grid control box according to any one of claims 1-4, characterized in that, The shell is made of plastic material.
6. The off-grid control box of claim 1, wherein, It also includes a first cover plate that covers the first circuit board and is detachably connected to the housing.
7. The off-grid control box of claim 6, wherein, It also includes a first operating element located within the accommodating cavity, wherein an exposure hole is provided on the first cover plate, and the orthographic projection of the exposure hole along the thickness direction of the first cover plate covers the first operating element.
8. The off-grid control box of claim 7, wherein, It also includes a second operating element and a second cover plate located within the accommodating cavity, the second cover plate being detachably connected to the housing and covering the second operating element.
9. The off-grid control box of claim 8, wherein, The coverage area of the second cover plate is smaller than the coverage area of the first cover plate, and / or, The first operating element is higher than the second operating element in the thickness direction.
10. The off-grid control box of claim 1, wherein, It also includes a mounting component and a second circuit board disposed within the accommodating cavity. The mounting component includes a first mounting portion and two second mounting portions. The two second mounting portions are spaced apart and connected to the heat sink. The second circuit board is electrically connected to the first circuit board and located between the two second mounting portions. The first mounting portion is connected to the end of the second mounting portion away from the heat sink, and the first mounting portion is spaced apart from the second circuit board along the thickness direction of the second circuit board. The first mounting section has a wire groove for accommodating cables.
11. The off-grid control box of claim 10, wherein, It also includes a cable hub that protrudes from the wire groove and is used to thread a binding cord for securing the cable.