Power optimization module, photovoltaic junction box, three-part junction box and photovoltaic system

Abstract

The embodiment of the present application provides a power optimization module, a photovoltaic junction box, a three-part junction box and a photovoltaic system. The power optimization module includes N Buck circuits connected in parallel; each Buck circuit includes a first input terminal, a second input terminal, a first output terminal and a second output terminal; in the N Buck circuits, each two adjacent Buck circuits are divided into a first Buck circuit and a second Buck circuit; the second input terminal of the first Buck circuit is electrically connected to the first input terminal of the second Buck circuit, and at least one wiring input terminal is led out at the connection; the second output terminal of the first Buck circuit is electrically connected to the first output terminal of the second Buck circuit, and the N Buck circuits include two wiring output terminals, which are used to be electrically connected to electrical equipment. The technical solution of the embodiment of the present application can assemble the photovoltaic module and the power optimization module into a whole for transportation, thereby reducing the installation time of the photovoltaic system.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic cells and the technical field of photovoltaic component power optimization, and in particular to a power optimization module, a photovoltaic junction box, a three-part junction box and a photovoltaic system. Background Art

[0002] New energy generation technologies represented by photovoltaic power generation have attracted widespread attention due to their inexhaustible, clean and pollution-free characteristics. In order to improve the efficiency of photovoltaic power generation, it is often necessary to optimize the output power through a power optimizer.

[0003] At present, the power optimizer and the photovoltaic module are two separate devices. Multiple junction boxes are connected to the photovoltaic module, and the diode module is fixed in the junction box. When installing at the project site (the installation site of the photovoltaic system), the power optimizer needs to be fixed on the back of the photovoltaic module and electrically connected to the diode module. Due to the setting of multiple junction boxes and power optimizers, the back of the photovoltaic module is blocked in a large area, which affects the power generation efficiency of the photovoltaic module. In addition, this installation process is cumbersome and prone to problems, which is not conducive to the rapid and reliable completion of the photovoltaic project.

[0004] It should be noted that the above content is not necessarily prior art, nor is it intended to limit the scope of patent protection of this application. Summary of the invention

[0005] The embodiments of the present application provide a power optimization module, a photovoltaic junction box, a three-part junction box, and a photovoltaic system to solve or alleviate one or more of the technical problems mentioned above.

[0006] In a first aspect of an embodiment of the present application, a power optimization module is provided, which is applied to a photovoltaic module. The power optimization module includes N Buck circuits connected in parallel; each Buck circuit includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal;

[0007] Among the N Buck circuits, every two adjacent Buck circuits are divided into a first Buck circuit and a second Buck circuit; wherein the second input end of the first Buck circuit is electrically connected to the first input end of the second Buck circuit, and at least one wiring input end is led out at the connection; the wiring input end is used to be electrically connected to the bus bar of the photovoltaic module; the second output end of the first Buck circuit is electrically connected to the first output end of the second Buck circuit, and the N Buck circuits include two wiring output ends, and the two wiring output ends are used to be electrically connected to the electrical equipment.

[0008] In one implementation, one power optimization module is used for one photovoltaic module; the photovoltaic module includes N battery string units, and N Buck circuits are electrically connected to corresponding battery string units respectively.

[0009] In one embodiment, N Buck circuits are electrically connected to corresponding battery string units respectively, including:

[0010] After the N Buck circuits are connected in parallel, they include a first input terminal, N-1 wiring input terminals and a second input terminal in sequence; the battery string unit includes a first bus bar and a second bus bar with opposite polarities; the N battery string units include a head battery string unit arranged in front, a terminal battery string unit arranged in the end, and an intermediate battery string unit arranged between the head battery string unit and the terminal battery string unit;

[0011] The first input end is electrically connected to the first bus bar of the head-end battery string unit, the second bus bar of the head-end battery string unit is electrically connected to the first bus bar of the middle battery string unit and is electrically connected to the wiring input end; the second bus bar of the middle battery string unit is electrically connected to the first bus bar of the end battery string unit and is electrically connected to the wiring input end, and the second input end is electrically connected to the second bus bar of the end battery string unit.

[0012] In one embodiment, one power optimization module is used for M photovoltaic modules, where M is an integer greater than or equal to 2;

[0013] The second input end of the first Buck circuit is electrically connected to the first input end of the second Buck circuit, and two wiring input ends are led out at the connection; the M photovoltaic modules include a first photovoltaic module and M-1 second photovoltaic modules, and the first photovoltaic module includes N battery string units; the number of Buck circuits is N+M-1; the N Buck circuits are respectively electrically connected to the N battery string units in the first photovoltaic module; one of the two wiring input ends is electrically connected to a second photovoltaic module, and the first input ends of the M-1 Buck circuits are respectively electrically connected to the bus bars of the M-1 second photovoltaic modules.

[0014] In one embodiment, the second photovoltaic assembly includes a plurality of diode junction boxes, and the number of the diode junction boxes matches the number of battery string units in the second photovoltaic assembly.

[0015] In one implementation, the Buck circuit includes:

[0016] MOS tube, the drain of the MOS tube serves as the first input end of the Buck circuit; the gate of the MOS tube is communicatively connected with the main control module to receive the adjustment signal;

[0017] The diode, the anode of the diode serves as the second input terminal of the Buck circuit;

[0018] An inductor, wherein a first end of the inductor is electrically connected to a source of the MOS tube and a cathode of the diode;

[0019] The capacitor has two ends electrically connected to the second end of the inductor and the anode of the diode respectively, and the two ends of the capacitor also serve as the first output end and the second output end of the Buck circuit respectively.

[0020] According to a second aspect of an embodiment of the present application, a power optimization module is provided for use in a photovoltaic module. The photovoltaic module includes a plurality of battery string units. A power optimization module is correspondingly provided for each battery string unit. The power optimization module includes a Buck circuit. The Buck circuit includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal. The battery string unit includes a first bus bar and a second bus bar with opposite polarities. The first input terminal is electrically connected to the first bus bar of the battery string unit, and the second input terminal is electrically connected to the second bus bar of the battery string unit.

[0021] According to a third aspect of an embodiment of the present application, a three-part junction box is provided, comprising a first junction box, a second junction box and a third junction box; the first junction box, the second junction box and the third junction box are each provided with a power optimization module of any of the above-mentioned embodiments; and the three power optimization modules are connected in parallel.

[0022] A fourth aspect of the embodiments of the present application provides a photovoltaic junction box, comprising:

[0023] A wiring unit, the wiring unit includes a conductive sheet, the conductive sheet includes at least a first terminal and a second terminal, the first terminal is used to be electrically connected to a bus bar of a photovoltaic module, and the photovoltaic module has a power optimization module of any implementation aspect of the above embodiment; the second terminal is used to be electrically connected to an input end of a cable, and an output end of the cable is electrically connected to the power optimization module;

[0024] The plastic packaging unit is used to package the wiring unit and fix the wiring unit to the back of the photovoltaic module.

[0025] In one embodiment, the conductive sheet is provided with a busbar through-hole, so that the busbar passes through the busbar through-hole and is electrically connected to the first terminal.

[0026] In a fifth aspect of the embodiments of the present application, a three-part junction box is provided, which includes a positive junction box, an intermediate junction box and a negative junction box; the positive junction box and / or the negative junction box adopts a photovoltaic junction box according to any of the implementation aspects of the above embodiments; and the intermediate junction box is provided with a power optimization module according to any of the implementation aspects of the above embodiments.

[0027] In a sixth aspect of the embodiments of the present application, a photovoltaic system is provided, including a photovoltaic component and a three-part junction box according to any one of the above embodiments.

[0028] By using the power optimization module provided in the embodiment of the present application, the power optimization module can be welded to the photovoltaic module and fixed to the back of the photovoltaic module. The photovoltaic module and the power optimization module are then assembled into a whole for transportation. During the installation of the photovoltaic system, there is no need to additionally fix the power optimizer and no additional wiring is required, which greatly reduces the installation time of the photovoltaic system and improves the installation efficiency. It reduces the technical requirements for installers and users can install it themselves, which facilitates the widespread application and promotion of photovoltaic modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0030] Figure 1 A schematic diagram of the circuit structure of the Buck circuit provided in an embodiment of the present application is shown.

[0031] Figure 2 A schematic diagram of the circuit structure of a power optimization module provided in one embodiment of the present application is shown.

[0032] Figure 3 A schematic diagram of the circuit structure of a power optimization module provided in another embodiment of the present application is shown.

[0033] Figure 4 A circuit connection diagram of a three-part junction box provided in one embodiment of the present application is shown.

[0034] Figure 5 A schematic diagram showing the circuit connection of a three-part junction box provided in one embodiment of the present application for a photovoltaic module is shown.

[0035] Figure 6 Another circuit connection diagram of a three-part junction box provided in one embodiment of the present application for a photovoltaic module is shown.

[0036] Figure 7 A circuit connection diagram of a three-part junction box provided in another embodiment of the present application is shown.

[0037] Figure 8 A schematic diagram showing the circuit connection of a three-part junction box provided in another embodiment of the present application for a photovoltaic module is shown.

[0038] Fig. 9 A schematic structural diagram of a photovoltaic junction box provided in one embodiment of the present application is shown. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other in the absence of conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0040] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0041] In the present application, when it comes to a numerical interval (i.e., a numerical range), unless otherwise specified, the distribution of the optional numerical values ​​in the numerical interval is considered to be continuous, and includes the two numerical endpoints (i.e., the minimum and maximum values) of the numerical interval, and each numerical value between the two numerical endpoints. Unless otherwise specified, when the numerical interval only refers to an integer in the numerical interval, it includes the two endpoint integers of the numerical range, and each integer between the two endpoints, which is equivalent to directly listing each integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be merged. In other words, unless otherwise specified, the numerical range disclosed in the present application should be understood to include any and all sub-ranges included therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, a percentage, a ratio, etc. "Numerical interval" allows for broadly including quantitative intervals such as percentage intervals, ratio intervals, and ratio intervals.

[0042] Hereinafter, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. It should be noted that these exemplary embodiments can be implemented in many different forms and should not be construed as being limited to the embodiments described herein.

[0043] The present application embodiment provides a power optimization module, which is applied to a photovoltaic module. Figures 1 to 3As shown, the power optimization module includes N Buck circuits (also known as step-down circuits) connected in parallel, where N is an integer greater than or equal to 3; each Buck circuit includes a first input terminal In1, a second input terminal In2, a first output terminal Out1 and a second output terminal Out2; in the N Buck circuits, every two adjacent Buck circuits are divided into a first Buck circuit and a second Buck circuit; wherein the second input terminal In2 of the first Buck circuit is electrically connected to the first input terminal In1 of the second Buck circuit, and at least one wiring input terminal (B, C or X) is led out at the connection; the wiring input terminal (B, C or X) is used to be electrically connected to the bus bar of the photovoltaic module; the second output terminal Out2 of the first Buck circuit is electrically connected to the first output terminal Out1 of the second Buck circuit, and the N Buck circuits include two wiring output terminals (E, F), and the two wiring output terminals (E, F) are used to be electrically connected to the electrical equipment.

[0044] In the embodiment of the present application, a Buck circuit is electrically connected to the photovoltaic module to optimize the output power of the photovoltaic module. The Buck circuit can replace the original diode module in the photovoltaic module and does not need to be connected to a power optimizer.

[0045] The power optimization of photovoltaic modules is achieved by connecting a power optimizer equipped with an MPPT (Maximum Power Point Tracking) algorithm to the photovoltaic modules. Based on the MPPT algorithm, an adjustment signal is sent to ensure that the photovoltaic modules can output maximum power under different environmental conditions, thereby achieving power optimization. In the embodiment of the present application, the Buck circuit includes a MOS tube, which can adjust the voltage drop in the circuit based on the adjustment signal, thereby achieving power output regulation.

[0046] By using the power optimization module provided in the embodiment of the present application, the power optimization module can be welded to the photovoltaic module and fixed to the back of the photovoltaic module. The photovoltaic module and the power optimization module are then assembled into a whole for transportation. During the installation of the photovoltaic system, there is no need to additionally fix the power optimizer and no additional wiring is required, which greatly reduces the installation time of the photovoltaic system and improves the installation efficiency. It reduces the technical requirements for installers and users can install it themselves, which facilitates the widespread application and promotion of photovoltaic modules.

[0047] Figures 4 to 6 An implementation method of applying the power optimization module of the embodiment of the present application to a photovoltaic module is shown. In this implementation method, one power optimization module is applied to one photovoltaic module. The photovoltaic module includes N battery string units, and N Buck circuits are electrically connected to the corresponding battery string units respectively.

[0048] In the embodiment of the present application, the Buck circuit corresponding to the battery string unit optimizes the power output of each battery string unit respectively, which can improve the power optimization effect and ensure the stable power output of the photovoltaic module.

[0049] In the embodiment of the present application, one Buck circuit corresponds to one battery string unit, which can achieve a stable voltage output of the battery string unit without the need to connect a diode module. Therefore, the Buck circuit not only realizes the function of power optimization, but also realizes the function of the diode module, and reversely protects the battery string unit. The design of this structure can reduce the number and space of junction boxes in photovoltaic modules, reduce the load-bearing capacity of photovoltaic modules, and reduce the shielding area, further protect photovoltaic modules, and improve the power generation efficiency of photovoltaic modules.

[0050] In one embodiment, Figure 2 , Figures 4 to 6 As shown, N Buck circuits are electrically connected to corresponding battery string units respectively, including: after the N Buck circuits are connected in parallel, they include a first input terminal A, N-1 wiring input terminals (B or C) and a second input terminal D in sequence; the battery string unit includes a first bus bar and a second bus bar with opposite polarities; the N battery string units include a head battery string unit arranged in front, a terminal battery string unit arranged at the end, and an intermediate battery string unit arranged between the head battery string unit and the terminal battery string unit; the first input terminal A is electrically connected to the first bus bar of the head battery string unit, the second bus bar of the head battery string unit is electrically connected to the first bus bar of the intermediate battery string unit and is electrically connected to the wiring input terminal B; the second bus bar of the intermediate battery string unit is electrically connected to the first bus bar of the terminal battery string unit and is electrically connected to the wiring input terminal C, and the second input terminal D is electrically connected to the second bus bar of the terminal battery string unit.

[0051] like Figure 4 and Figure 5 As shown, when the number of battery string units of the photovoltaic module is 3, that is, N=3. The power optimizer includes 3 Buck circuits.

[0052] In the diagrams of the embodiments of the present application, thin solid lines represent busbars, dashed lines represent cable or wire connections, and thick solid lines represent connector connections.

[0053] The embodiment of the present application adopts the above-mentioned connection method to realize the parallel connection of N Buck circuits and respectively realize the power optimization output of the corresponding N battery string units.

[0054] The embodiment of the present application adopts the above-mentioned connection method, and N Buck circuits can be integrated together, that is, they can be integrated into one device, which can further reduce external connecting wires and further reduce the shielding area, thereby improving the simple appearance of the photovoltaic module, simplifying the circuit layout of the photovoltaic module and improving the power generation efficiency of the photovoltaic module.

[0055] In one embodiment, Figure 3 , Figure 7 and Figure 8 As shown, a power optimization module is used for M photovoltaic modules, where M is an integer greater than or equal to 2. The second input terminal In2 of the first Buck circuit is electrically connected to the first input terminal In1 of the second Buck circuit, and two wiring input terminals (X1, X2) are led out at the connection; the M photovoltaic modules include a first photovoltaic module 610 and M-1 second photovoltaic modules 620, and the first photovoltaic module 610 includes N battery string units, where N is an integer greater than or equal to 3; the number of Buck circuits is N+M-1; the N Buck circuits are electrically connected to the N battery string units in the first photovoltaic module 610 respectively; one of the two wiring input terminals (X1, X2) is electrically connected to a second photovoltaic module 620, and the first input terminals In1 of the M-1 Buck circuits are electrically connected to the bus bars of the M-1 second photovoltaic modules 620 respectively.

[0056] In the embodiment of the present application, by applying one power optimization module to the power optimization of two or more photovoltaic modules, the number of power optimization modules required to be configured for multiple photovoltaic modules in the photovoltaic system can be reduced, the shielding area can be further reduced, and the production cost can be saved.

[0057] like Figure 8 In the photovoltaic system shown, the photovoltaic module having a power optimization module on the back is the first photovoltaic module 610, and its three battery string units are electrically connected to the Buck circuit in the power optimization module respectively. The photovoltaic module not having a power optimization module is the second photovoltaic module 620, and the bus bars led out from the battery string units in the second photovoltaic module 620 are electrically connected to the diode modules respectively, and then connected together to the power optimization module to optimize the output power.

[0058] In one embodiment, the second photovoltaic assembly 620 includes a plurality of diode junction boxes 400 , and the number of the diode junction boxes 400 matches the number of battery string units in the second photovoltaic assembly 620 .

[0059] The diode junction box 400 includes a diode module for achieving a stable current output of the battery string unit in the second photovoltaic assembly 620 .

[0060] In one example, the number of diode junction boxes 400 is equal to the number of battery string units in the second photovoltaic component 620, one diode junction box 400 is connected to the corresponding battery string unit, and the diode junction boxes 400 of multiple battery string units are connected in series and then electrically connected to the power optimization module of the first photovoltaic component 610.

[0061] In one example, M−1 second photovoltaic components 620 may be electrically connected to the power optimization modules in the first photovoltaic component 610 , respectively.

[0062] In one embodiment, Figures 1 to 3 As shown, the Buck circuit includes a MOS tube, a diode D1, an inductor L1 and a capacitor C1.

[0063] The drain D2 of the MOS tube serves as the first input terminal In1 of the Buck circuit; the gate G2 of the MOS tube is connected to the main control module for communication to receive the adjustment signal. The anode of the diode D1 serves as the second input terminal In2 of the Buck circuit. The first end of the inductor L1 is electrically connected to the source S2 of the MOS tube and the cathode of the diode D1. The two ends of the capacitor C1 are electrically connected to the second end of the inductor L1 and the anode of the diode D1, respectively, and the two ends of the capacitor C1 also serve as the first output terminal Out1 and the second output terminal Out2 of the Buck circuit, respectively.

[0064] The main control module can use the MPPT algorithm to output the adjustment signal to the MOS tube to adjust the on-off between the MOS tube and the inductor L1 in the Buck circuit to ensure that the photovoltaic module can output the maximum power under different environmental conditions, thereby achieving power optimization. The adjustment signals in multiple Buck circuits can be synchronized or asynchronous, and can be the same or different.

[0065] The present application also provides a power optimization module, which is applied to a photovoltaic module. The photovoltaic module includes a plurality of battery string units, and each battery string unit is provided with a power optimization module. The power optimization module includes a Buck circuit, such as Figure 1 As shown, the Buck circuit includes a first input terminal In1, a second input terminal In2, a first output terminal Out1 and a second output terminal Out2; the battery string unit includes a first bus bar and a second bus bar with opposite polarities, the first input terminal In1 is electrically connected to the first bus bar of the battery string unit, and the second input terminal In2 is electrically connected to the second bus bar of the battery string unit.

[0066] The circuit structure of the Buck circuit is the same as that of the Buck circuit in the above embodiment.

[0067] The embodiment of the present application is different from the above-mentioned scheme in that, in this embodiment, there is only one Buck circuit in a power optimization module, and it is electrically connected to the corresponding battery string unit; the outputs of the Buck circuits of multiple battery string units are then connected in series to achieve independent power optimization of a single battery string unit. The external circuit is simpler than the existing external power optimizer, and can facilitate performance testing and maintenance of the power optimization module.

[0068] An embodiment of the present application also provides a three-part junction box, which includes a first junction box, a second junction box and a third junction box; the first junction box, the second junction box and the third junction box are each provided with a power optimization module of any implementation aspect of the above-mentioned embodiment; and the three power optimization modules are connected in parallel.

[0069] In the embodiments of the present application, by replacing the diode junction box of the original solution with a first junction box, a second junction box or a third junction box having a single Buck circuit, voltage output is achieved while power optimization is completed. Therefore, there is no need to connect a power optimizer separately, which can reduce the wiring and installation of the external power optimizer and improve the installation efficiency of the photovoltaic system.

[0070] The present application also provides a photovoltaic junction box, such as Fig. 9 As shown, it includes a wiring unit and a plastic packaging unit 800.

[0071] The wiring unit includes a conductive sheet 700, which includes at least a first terminal 710 and a second terminal 720. The first terminal 710 is used to be electrically connected to a bus bar of a photovoltaic module, and the photovoltaic module has a power optimization module of any implementation aspect of the above-mentioned embodiments; the second terminal 720 is used to be electrically connected to an input end of a cable, and an output end of the cable is electrically connected to the power optimization module of the photovoltaic module; a plastic encapsulation unit 800 is used to encapsulate the wiring unit and fix the wiring unit to the back of the photovoltaic module.

[0072] There are no devices in the photovoltaic junction box in the embodiment of the present application, and the conductive sheet 700 serves as a wire connection. Through the design of this photovoltaic junction box, the bus bar can be easily led out and quickly connected to other devices, such as the power optimization module in the above embodiment, EL (Electroluminescent) test equipment, IV (Current-Voltage) test equipment, etc.

[0073] In one embodiment, the conductive sheet 700 is provided with a bus bar through-hole 730 , so that the bus bar passes through the bus bar through-hole 730 and is electrically connected to the first terminal 710 .

[0074] The busbar passes through the busbar through-hole 730 and is electrically connected to the first terminal 710 , which can make the busbar welding more stable, enhance the position stability between the photovoltaic junction box and the photovoltaic module, and avoid short circuit between the busbar and the second terminal 720 .

[0075] An embodiment of the present application also provides a three-part junction box, which includes a positive junction box 200, an intermediate junction box 100 and a negative junction box 300; the positive junction box 200 and / or the negative junction box 300 adopts a photovoltaic junction box of any implementation aspect of the above-mentioned embodiments; the intermediate junction box 100 is provided with a power optimization module of any implementation aspect of the above-mentioned embodiments one and two.

[0076] An embodiment of the present application further provides a photovoltaic system, comprising a photovoltaic component and a three-part junction box according to any one of the above embodiments.

[0077] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0078] For the convenience of description, the orientation or position relationship indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, vertical, horizontal" and "top, bottom" is usually based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these directional words 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 cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Therefore, the exemplary term "above..." can include both "above..." and "below..." orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here are interpreted accordingly.

[0079] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0080] Unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is lower in level than the second feature.

[0081] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0082] It should also be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of this application.

[0083] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0084] It should also be noted that the above are only preferred embodiments of the present application, and the patent protection scope of the present application is not limited thereto. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A power optimization module, applied to a photovoltaic module, characterized in that: The power optimization module includes N Buck circuits connected in parallel, where N is an integer greater than or equal to 3; each of the Buck circuits includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal; Among the N Buck circuits, every two adjacent Buck circuits are divided into a first Buck circuit and a second Buck circuit; wherein the second input end of the first Buck circuit is electrically connected to the first input end of the second Buck circuit, and at least one wiring input end is led out at the connection; the wiring input end is used to be electrically connected to the bus bar of the photovoltaic module; the second output end of the first Buck circuit is electrically connected to the first output end of the second Buck circuit, and the N Buck circuits include two wiring output ends, and the two wiring output ends are used to be electrically connected to electrical equipment.

2. The power optimization module according to claim 1, characterized in that: One power optimization module is used for one photovoltaic module; the photovoltaic module includes N battery string units, and the N Buck circuits are electrically connected to the corresponding battery string units respectively.

3. The power optimization module according to claim 2, characterized in that: The N Buck circuits are electrically connected to the corresponding battery string units respectively, including: After the N Buck circuits are connected in parallel, they include a first input terminal, N-1 wiring input terminals and a second input terminal in sequence; the battery string unit includes a first bus bar and a second bus bar with opposite polarities; the N battery string units include a head battery string unit arranged in front, a terminal battery string unit arranged in the end, and an intermediate battery string unit arranged between the head battery string unit and the terminal battery string unit; The first input end is electrically connected to the first bus bar of the head-end battery string unit, the second bus bar of the head-end battery string unit is electrically connected to the first bus bar of the middle battery string unit and is electrically connected to the wiring input end; the second bus bar of the middle battery string unit is electrically connected to the first bus bar of the end battery string unit and is electrically connected to the wiring input end, and the second input end is electrically connected to the second bus bar of the end battery string unit.

4. The power optimization module according to claim 1, characterized in that: One power optimization module is used for M photovoltaic modules, where M is an integer greater than or equal to 2; The second input end of the first Buck circuit is electrically connected to the first input end of the second Buck circuit, and two wiring input ends are led out at the connection; the M photovoltaic components include a first photovoltaic component and M-1 second photovoltaic components, and the first photovoltaic component includes N battery string units; the number of the Buck circuits is N+M-1; the N Buck circuits are respectively electrically connected to the N battery string units in the first photovoltaic component; one of the two wiring input ends is electrically connected to one of the second photovoltaic components, and the first input ends of the M-1 Buck circuits are respectively electrically connected to the bus bars of the M-1 second photovoltaic components.

5. The power optimization module according to claim 4, characterized in that: The second photovoltaic assembly includes a plurality of diode junction boxes, and the number of the diode junction boxes matches the number of battery string units in the second photovoltaic assembly.

6. The power optimization module according to any one of claims 1 to 5, characterized in that: The Buck circuit comprises: A MOS tube, wherein the drain of the MOS tube serves as the first input end of the Buck circuit; and the gate of the MOS tube is communicatively connected with the main control module to receive the adjustment signal; A diode, wherein an anode of the diode serves as the second input terminal of the Buck circuit; an inductor, wherein a first end of the inductor is electrically connected to a source of the MOS tube and a cathode of the diode; A capacitor, wherein two ends of the capacitor are electrically connected to the second end of the inductor and the anode of the diode respectively, and the two ends of the capacitor also serve as the first output end and the second output end of the Buck circuit respectively.

7. A photovoltaic junction box, characterized in that: include: A wiring unit, the wiring unit comprising a conductive sheet, the conductive sheet comprising at least a first terminal and a second terminal, the first terminal being used to be electrically connected to a bus bar of a photovoltaic module, the photovoltaic module having a power optimization module according to any one of claims 1 to 6; the second terminal being used to be electrically connected to an input end of a cable, and an output end of the cable being electrically connected to the power optimization module; The plastic packaging unit is used to package the wiring unit and fix the wiring unit to the back side of the photovoltaic module.

8. The photovoltaic junction box according to claim 7, characterized in that: The conductive sheet is provided with a busbar through-hole, so that the busbar passes through the busbar through-hole and is electrically connected to the first terminal.

9. A three-part junction box, characterized in that: The three-part junction box includes a positive junction box, an intermediate junction box and a negative junction box; the positive junction box and / or the negative junction box adopts the photovoltaic junction box described in any one of claims 7 to 8; the intermediate junction box is provided with the power optimization module described in any one of claims 1 to 6.

10. A photovoltaic system, characterized in that: It comprises a photovoltaic component and the three-part junction box as claimed in claim 9.

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