Photovoltaic conversion system and isolating switch

Abstract

The embodiment of the invention provides a photovoltaic conversion system and an isolation switch. The photovoltaic conversion system comprises the isolation switch and a DC-DC conversion circuit. The isolation switch is used for being connected with the DC-DC conversion circuit and the plurality of photovoltaic units. Each photovoltaic unit comprises a photovoltaic module, a photovoltaic group string formed by connecting the plurality of photovoltaic modules in series or a photovoltaic array formed by connecting the plurality of photovoltaic modules in series and in parallel. The isolating switch comprises a plurality of switch poles, each switch pole comprises two contact assemblies which are electrically isolated from each other, and each contact assembly is used for connecting the direct current-direct current conversion circuit and at least one photovoltaic unit in the plurality of photovoltaic units; each contact assembly comprises a static contact and a moving contact, and the static contact and the moving contact can be in contact with each other or separated from each other so as to control closing or opening of the contact assembly; all the contact assemblies in the isolation switch are switched on or switched off at the same time. According to the scheme of the embodiment of the invention, the requirement of a photovoltaic system can be met without adding a switch pole of the isolating switch.

Description

Technical Field

[0001] This application relates to the field of power technology, and in particular to a photovoltaic conversion system and a disconnecting switch. Background Technology

[0002] Disconnect switches are commonly used in photovoltaic (PV) systems. They connect PV units to the power converter, effectively isolating them and ensuring a clear disconnect point between the PV side and the equipment side during maintenance or repair of the power converter, thus guaranteeing the safety of operators.

[0003] A disconnecting switch consists of multiple electrically isolated switching poles (or contact modules). Each switching pole has a moving contact and a stationary contact. The moving contact can contact or separate from the stationary contact to achieve the closing or opening of the switching pole.

[0004] In photovoltaic systems, each switching electrode of a disconnector can be connected to a photovoltaic cell. As the power of the power converter increases, more photovoltaic cells need to be connected to the disconnector at a certain voltage level, and correspondingly, the number of switching electrodes of the disconnector also needs to increase. However, increasing the number of switching electrodes brings challenges in terms of the size, temperature rise, and reliability of the disconnector. Summary of the Invention

[0005] This application provides a photovoltaic conversion system and a disconnecting switch, which can connect more photovoltaic units without increasing the number of switching electrodes of the disconnecting switch, thus meeting the needs of the photovoltaic system.

[0006] In a first aspect, embodiments of this application provide a photovoltaic conversion system, which includes a disconnecting switch and a DC-DC conversion circuit. The disconnecting switch is used to connect the DC-DC conversion circuit and multiple photovoltaic units. Each photovoltaic unit includes a photovoltaic module, a photovoltaic string formed by multiple photovoltaic modules connected in series, or a photovoltaic array formed by multiple photovoltaic modules connected in series and parallel. The disconnecting switch includes multiple switching poles, each switching pole including two contact assemblies that are electrically isolated from each other. Each contact assembly is used to connect the DC-DC conversion circuit and at least one photovoltaic unit among the multiple photovoltaic units. Each contact assembly includes a stationary contact and a moving contact, which can contact or separate to control the closing or opening of the contact assembly. All contact assemblies in the disconnecting switch are closed or opened simultaneously.

[0007] In this embodiment, by integrating at least two electrically isolated contact assemblies into each switch pole of the disconnector, and connecting each contact assembly to at least one photovoltaic unit, each switch pole can support multiple independent current loops. This allows for an increase in the number of photovoltaic units connected to the switch pole without increasing the number of switch poles, thus meeting the high-power supply demands of the current photovoltaic power generation field. The solution in this embodiment fully utilizes the internal space of a single switch pole to arrange multiple contact assemblies, ensuring that the size of a single switch pole does not increase, or increases substantially. Therefore, the solution in this embodiment can increase the number of photovoltaic strings connected to the disconnector without increasing its volume, thereby improving power generation capacity.

[0008] In one implementation of the first aspect, the plurality of switching electrodes includes a first switching electrode and a second switching electrode; two contact assemblies of the first switching electrode are respectively connected to the positive electrode of at least one photovoltaic unit; and two contact assemblies of the second switching electrode are respectively connected to the negative electrode of at least one photovoltaic unit. In this implementation, by connecting two contact assemblies within the same switching electrode to the same electrodes of different photovoltaic units, it is beneficial to achieve electrical isolation between the two circuits containing the two contact assemblies.

[0009] In one implementation of the first aspect, the plurality of photovoltaic units include a first photovoltaic unit and a second photovoltaic unit; two contact assemblies of the first switch electrode are respectively connected to the positive electrode of the first photovoltaic unit and the positive electrode of the second photovoltaic unit; two contact assemblies of the second switch electrode are respectively connected to the negative electrode of the first photovoltaic unit and the negative electrode of the second photovoltaic unit. In this implementation, by connecting two contact assemblies within the same switch electrode to the same electrodes of different photovoltaic units, it is beneficial to achieve electrical isolation between the two circuits containing the two contact assemblies; furthermore, by correspondingly connecting the first switch electrode and the second switch electrode to the first photovoltaic unit and the second photovoltaic unit, it is beneficial to simplify the connection between the photovoltaic string and the switch electrode, and improve the system deployment efficiency.

[0010] In one implementation of the first aspect, multiple photovoltaic units include a first photovoltaic unit, a second photovoltaic unit, and a third photovoltaic unit; two contact assemblies of the first switch electrode are respectively connected to the positive terminals of the first and second photovoltaic units; two contact assemblies of the second switch electrode are respectively connected to the negative terminals of the first and third photovoltaic units. In this implementation, by connecting two contact assemblies within the same switch electrode to the same polarity electrodes of different photovoltaic units, electrical isolation between the two circuits containing the two contact assemblies is achieved; furthermore, by correspondingly connecting the first and second switch electrodes to the first, second, and third photovoltaic units, product requirements in certain scenarios can be met.

[0011] In one implementation of the first aspect, the multiple switching electrodes include a third switching electrode. Two contact components of the third switching electrode are respectively connected to the positive and negative electrodes of the same photovoltaic unit, or the two contact components of the third switching electrode are respectively connected to the positive electrode of one photovoltaic unit and the negative electrode of another photovoltaic unit. In this implementation, by connecting the two contact components within the same switching electrode to the positive and negative electrodes of the same photovoltaic string, the connection between the photovoltaic string and the switching electrode is simplified, improving system deployment efficiency. Alternatively, by connecting the two contact components within the same switching electrode to the positive and negative electrodes of different photovoltaic strings, product requirements in certain scenarios can be met.

[0012] In one implementation of the first aspect, each contact assembly is connected to at least two photovoltaic units in parallel. In this implementation, by connecting at least two photovoltaic strings in parallel to one contact assembly, the number of photovoltaic strings connected to the disconnecting switch can be increased. This facilitates matching with high-power power converters, meets the high-power supply demands of the current photovoltaic power generation field, and ensures a relatively small number of switching poles for the disconnecting switch.

[0013] In one implementation of the first aspect, the photovoltaic conversion system includes a first DC-DC converter circuit and a second DC-DC converter circuit; multiple switching electrodes include a first switching electrode and a second switching electrode, wherein two contact assemblies in the first switching electrode are both connected to the first DC-DC converter circuit, and two contact assemblies in the second switching electrode are both connected to the second DC-DC converter circuit. In this implementation, by connecting different switching electrodes to different DC-DC converter circuits, the rated power of the DC-DC converter circuit can be matched with the rated power of the switching electrode, thus meeting product requirements.

[0014] In one implementation of the first aspect, the photovoltaic conversion system further includes a DC-AC conversion circuit, and all DC-DC conversion circuits in the photovoltaic conversion system are connected to the DC-AC conversion circuit. In this implementation, by including the DC-AC conversion circuit in the photovoltaic conversion system, the photovoltaic conversion system can output AC power for connection to the power grid or AC load.

[0015] In one implementation of the first aspect, each switch pole further includes a drive base, and the moving contacts of both contact assemblies are fixed to the drive base; the disconnecting switch also includes a drive shaft, and multiple switch poles are connected to the drive shaft and arranged sequentially along the axial direction of the drive shaft, the drive shaft being used to drive the drive base to move; in each switch pole, the drive base is used to simultaneously drive the moving contacts of the two contact assemblies to contact or separate from the stationary contacts. In this implementation, by setting a single drive base and drive shaft, the drive base can be driven to move via the drive shaft, thereby enabling the drive base to simultaneously drive the moving contacts and stationary contacts in multiple contact assemblies to actuate. This implementation can rationally utilize the internal space of the switch pole to realize the structural design of multiple contact assemblies, allowing each switch pole to support multiple independent current loops.

[0016] In one implementation of the first aspect, a drive shaft is used to rotate about its axis and drive all drive seats to rotate simultaneously. By causing the drive shaft to drive the drive seats to rotate, the drive seats can drive the contact assembly to rotate and achieve contact actuation. This implementation can make reasonable use of the internal space of the switching pole to realize the structural design of multiple contact assemblies, so that each switching pole can support multiple independent current loops.

[0017] In one implementation of the first aspect, each switch pole further includes a connecting rod, which is rotatably connected to both the transmission base and the transmission shaft. The transmission shaft rotates about its axis and drives all the connecting rods to move simultaneously, causing each connecting rod to move the transmission base. By forming a driving mechanism with the transmission shaft, connecting rods, and transmission base, the transmission base can drive the contact assembly to move and achieve contact actuation. This implementation can make reasonable use of the internal space of the switch pole to realize the structural design of multiple contact assemblies, allowing each switch pole to support multiple independent current loops.

[0018] In one implementation of the first aspect, the disconnecting switch further includes a drive shaft, with multiple switch poles connected to the drive shaft and arranged sequentially along its axial direction. Each switch pole also includes a first drive seat and a second drive seat, which are respectively located on opposite sides of the drive shaft. The moving contacts of two contact assemblies are respectively fixed to the first and second drive seats. The drive shaft drives all the first and second drive seats to move simultaneously, so that the first and second drive seats in each switch pole respectively drive the moving contacts of the two contact assemblies to contact or separate from the stationary contacts. In this implementation, by setting two drive seats and a drive shaft, the drive shaft can drive the two drive seats to move simultaneously, thereby enabling the two drive seats to simultaneously drive the moving and stationary contacts of multiple contact assemblies to operate. This implementation can reasonably utilize the internal space of the switch pole to realize the structural design of multiple contact assemblies, allowing each switch pole to support multiple independent current loops.

[0019] In one implementation of the first aspect, the first transmission seat, the second transmission seat, and the transmission shaft are all provided with meshing teeth. The meshing teeth of the first transmission seat and the second transmission seat mesh with the meshing teeth of the transmission shaft. The transmission shaft is used to rotate around its axis and drive all the first transmission seats and all the second transmission seats to rotate simultaneously. In this implementation, the meshing transmission method is reliable, has strong mass production capability, and can meet product requirements.

[0020] In one implementation of the first aspect, each switch pole further includes a first link and a second link. The first link is rotatably connected to a drive shaft and a first drive seat, and the second link is rotatably connected to the drive shaft and a second drive seat. The drive shaft rotates about its axis and drives all the first and second links to move simultaneously, such that each first link pushes the first drive seat to move, and each second link pushes the second drive seat to move, wherein the first and second drive seats move in opposite directions. By forming a drive mechanism with the drive shaft, two links, and two drive seats, the two drive seats can drive the contact assembly to move and realize contact action. This implementation can reasonably utilize the internal space of the switch pole to realize the structural design of multiple contact assemblies, so that each switch pole can support multiple independent current loops.

[0021] In one implementation of the first aspect, both contact assemblies in each switch pole include terminals. In each switch pole, a first transmission seat is used to drive the moving contact of one contact assembly to contact or separate from the stationary contact and the terminal, and a second transmission seat is used to drive the moving contact of the other contact assembly to contact or separate from the stationary contact and the terminal. In each contact assembly, when the moving contact contacts the stationary contact and the terminal, the moving contact is located between the stationary contact and the terminal. In this implementation, when each contact assembly is opened, a break is formed between the moving contact and the stationary contact, and between the moving contact and the terminal; that is, each circuit can form a double break, which can meet the electrical safety requirements of products in some scenarios.

[0022] In one implementation of the first aspect, each of the two contact assemblies in each switch pole includes a flexible connection portion and a terminal block; in each contact assembly, the flexible connection portion connects the moving contact and the terminal block. In this implementation, by providing a flexible connection portion and a terminal block in each contact assembly, when each contact assembly is opened, only the moving contact and the stationary contact will form a break, meaning each circuit can form a single break. The single break design has a simple structure, and because there are fewer contact points, the contact resistance is low and the contact heat generation is low, which can meet product requirements.

[0023] Secondly, embodiments of this application provide a disconnecting switch, which includes a plurality of switch poles stacked sequentially and electrically isolated from each other. Each switch pole includes two contact assemblies that are electrically isolated from each other. The two contact assemblies are disposed on a surface perpendicular to the stacking direction of the plurality of switch poles. Each contact assembly includes a stationary contact and a moving contact. The stationary contact and the moving contact can contact or separate from each other to control the closing or opening of the contact assembly. All contact assemblies in the disconnecting switch are closed or opened simultaneously.

[0024] In this embodiment, by providing at least two electrically isolated contact assemblies in each switch pole of the disconnecting switch, and positioning these contact assemblies on a plane perpendicular to the stacking direction of the multiple switch poles, the internal space of a single switch pole can be fully utilized to integrate multiple contact assemblies, ensuring that the size of a single switch pole does not increase, or at least does not increase substantially. Furthermore, each switch pole can support multiple independent current loops, allowing for an increase in the number of photovoltaic units connected to the switch pole without increasing the number of switch poles in the disconnecting switch, thus meeting the high-power supply demands of the current photovoltaic power generation field. Therefore, the solution in this embodiment can increase the number of photovoltaic strings connected to the disconnecting switch without increasing its size, thereby improving power generation capacity.

[0025] In one implementation of the second aspect, each switch pole further includes a drive base, and the moving contacts of both contact assemblies are fixed to the drive base; the disconnecting switch also includes a drive shaft, and multiple switch poles are connected to the drive shaft and stacked sequentially along the axial direction of the drive shaft. The drive shaft is used to drive all drive bases to move simultaneously; in each switch pole, the drive base is used to simultaneously drive the moving contacts of the two contact assemblies to contact or separate from the stationary contacts. In this implementation, by setting a single drive base and drive shaft, the drive base can be driven to move through the drive shaft, thereby enabling the drive base to simultaneously drive the moving contacts and stationary contacts in multiple contact assemblies to perform actions. This implementation can reasonably utilize the internal space of the switch pole to realize the structural design of multiple contact assemblies, so that each switch pole can support multiple independent current loops.

[0026] In one implementation of the second aspect, a drive shaft is used to rotate about its axis, driving all drive seats to rotate simultaneously. By causing the drive shaft to drive the drive seats to rotate, the drive seats can drive the contact assembly to rotate and achieve contact actuation. This implementation can make reasonable use of the internal space of the switching pole to realize the structural design of multiple contact assemblies, so that each switching pole can support multiple independent current loops.

[0027] In one implementation of the second aspect, the disconnecting switch further includes a drive shaft, with multiple switch poles connected to the drive shaft and stacked sequentially along its axial direction. Each switch pole also includes a first drive seat and a second drive seat, respectively located on opposite sides of the drive shaft. The moving contacts of the two contact assemblies are fixed to the first and second drive seats, respectively. The drive shaft drives all the first and second drive seats to move simultaneously, so that the first and second drive seats in each switch pole respectively drive the moving contacts of the two contact assemblies to contact or separate from the stationary contacts. In this implementation, by setting two drive seats and a drive shaft, the drive shaft can drive the two drive seats to move simultaneously, thereby enabling the two drive seats to simultaneously drive the moving and stationary contacts of multiple contact assemblies to operate. This implementation can rationally utilize the internal space of the switch pole to realize the structural design of multiple contact assemblies, allowing each switch pole to support multiple independent current loops. Attached Figure Description

[0028] Figure 1 This is a schematic diagram illustrating an application scenario of a photovoltaic system according to an embodiment of this application;

[0029] Figure 2 This diagram illustrates the framework structure of a conventional photovoltaic system;

[0030] Figures 3-8 The framework structure of the photovoltaic system of several embodiments of this application is illustrated respectively;

[0031] Figure 9 This is a three-dimensional assembly structure diagram of a disconnecting switch according to an embodiment of this application;

[0032] Figure 10 yes Figure 9 An exploded view of the disconnector switch shown.

[0033] Figure 11 yes Figure 9 Another exploded view of the disconnector switch shown;

[0034] Figure 12 yes Figure 11 A schematic diagram of the three-dimensional assembly structure of one of the switching poles in the disconnector switch;

[0035] Figure 13 yes Figure 12 The diagram shows the exploded structure of the switch electrode;

[0036] Figure 14 yes Figure 12 A schematic diagram of the structure after the switch poles are disconnected;

[0037] Figure 15 and Figure 16This is a schematic diagram of the planar structure of the switching electrode according to an embodiment of this application;

[0038] Figure 17 and Figure 18 This is a schematic diagram of the planar structure of the switching electrode according to an embodiment of this application;

[0039] Figure 19 and Figure 20 This is a schematic diagram of the planar structure of the switching electrode according to an embodiment of this application.

[0040] Figure label:

[0041] 110 - Photovoltaic array; 111 - Photovoltaic module; 130 - Power converter; 1301 - Disconnecting switch; 1302 - DC-DC converter circuit; 1303 - DC-AC converter circuit; 140 - Power grid; 150 - Load;

[0042] 100 - Photovoltaic system; 10 - Photovoltaic system; 14 - Photovoltaic conversion system; 140-142 - DC-DC conversion circuit; 143 - DC-AC conversion circuit; P1 - Switch; C1 - First contact assembly; C2 - Second contact assembly; P2 - Switch; C3 - First contact assembly; C4 - Second contact assembly; P3 - Switch; C5 - Second contact assembly; Pn-1 - Switch; Pn - Switch; 11-12 - Photovoltaic string; 21-24 - Photovoltaic string;

[0043] 13-Disconnecting switch; 131-Operating mechanism; 131a-Operating device; 131b-Drive shaft; 132-Cover; 133a-Housing; h1-Through hole; 133c-Moving contact; 133d-Drive seat; h2-Through hole; 133e-Second terminal; 133f-Second flexible connection; 133g-Moving contact; 133h-Stationary contact; 133i-First terminal; 133j-First flexible connection; 133k-First drive seat; 133m-Second drive seat; 133n-Arc extinguishing grid; 133o-Connecting rod; 133p-First connecting rod; 133q-Second connecting rod; 133r-Arc extinguishing grid; a-First part; b-Second part; c-Third part. Detailed Implementation

[0044] The solution in this application embodiment can be used in various photovoltaic systems, which include photovoltaic units and photovoltaic conversion systems, etc., and the photovoltaic units and photovoltaic conversion systems are connected.

[0045] Photovoltaic units include, but are not limited to, photovoltaic modules, photovoltaic strings, and photovoltaic arrays. A photovoltaic string can be formed by multiple photovoltaic modules connected in series, and multiple photovoltaic strings can be connected in parallel to form a photovoltaic array.

[0046] Photovoltaic conversion systems are used to convert electrical energy. A photovoltaic conversion system may include an isolating switch and a DC-DC conversion circuit.

[0047] A disconnecting switch connects a photovoltaic (PV) unit to a DC-DC converter circuit. A disconnecting switch can connect multiple PV units or one or more DC-DC converter circuits. It provides safety isolation between the PV unit and the DC-DC converter circuit, ensuring that operators do not come into contact with live parts during maintenance, repair, or troubleshooting, thus improving the safety of electrical equipment and personnel.

[0048] The DC-DC converter circuit is used to regulate and stabilize the output voltage of the photovoltaic unit, and output a stable voltage. The DC-DC converter circuit is also used to increase or decrease the output voltage of the photovoltaic unit to the required voltage level. In one embodiment, the DC power generated by the photovoltaic unit, after passing through the DC-DC converter circuit, can be input to an energy storage device or a DC load.

[0049] In one embodiment, the photovoltaic conversion system may further include a DC-AC conversion circuit, which is connected to a DC-DC conversion circuit. The DC-AC conversion circuit is used to convert the DC power output from the photovoltaic unit into AC power for output to the power grid or an AC load. When there are multiple DC-DC circuits, all DC-DC conversion circuits can be connected to the DC-AC conversion circuit.

[0050] In this embodiment of the application, the photovoltaic conversion system can be a power converter or other power equipment with functions such as electrical isolation and power conversion.

[0051] In one embodiment, the disconnecting switch and the DC-DC converter circuit (which may also include a DC-AC converter circuit) can be integrated into a single device, such as in a power converter. In another embodiment, the disconnecting switch and the DC-DC converter circuit (which may also include a DC-AC converter circuit) can be separately configured as independent devices.

[0052] Figure 1 This diagram illustrates a scenario of a photovoltaic system. Figure 1 As shown, the photovoltaic system may include a photovoltaic array 110, a power converter 130, a power grid 140, and a load 150. One side of the power converter 130 can be connected to the photovoltaic array 110, and the other side of the power converter 130 can be connected to the power grid 140 and the load 150. The power converter 130 can be the photovoltaic conversion system described above.

[0053] like Figure 1As shown, the photovoltaic array 110 can be obtained by connecting multiple photovoltaic modules 111. Illustratively, multiple photovoltaic modules 111 can be connected in series to form a photovoltaic string, and multiple photovoltaic strings can be connected in parallel to form the photovoltaic array 110. It should be understood that supplying power in the form of a photovoltaic array 110 is merely an example. For low-power scenarios, a single photovoltaic module 111 can be used for power supply without forming a photovoltaic string or photovoltaic array 110; or a single photovoltaic string can be used for power supply without forming a photovoltaic array 110. The following explanation will continue using the photovoltaic array 110 as an example.

[0054] Understandable. Figure 1 The disconnector switch 1301 shown is merely illustrative and does not limit the number or connection method of disconnectors 1301. Figure 1 As shown schematically, the power converter 130 may include an isolating switch 1301, a DC-DC converter circuit 1302, and a DC-AC converter circuit 1303 (i.e., an inverter circuit). The isolating switch 1301 connects the photovoltaic array 110 to the DC-DC converter circuit 1302. The DC-DC converter circuit 1302 regulates and stabilizes the input voltage to output a stable voltage. The DC-DC converter circuit 1302 also increases or decreases the output voltage of the photovoltaic array 110 to the desired voltage level. The DC-AC converter circuit 1303 is connected to the DC-DC converter circuit 1302 and converts the DC power output from the photovoltaic array 110 into AC power, which is then output to the power grid 140 or the load 150.

[0055] In some photovoltaic-storage integration scenarios, the photovoltaic system may also include an energy storage device. This energy storage device can be connected to a DC-DC converter circuit 1302. The electrical energy generated by the photovoltaic array 110 is boosted or bucked by the DC-DC converter circuit 1302 before being input to the energy storage device. When the electrical energy generated by the photovoltaic array 110 is insufficient to supply power to the grid 140 or the load 150, the electrical energy stored in the energy storage device can be transmitted to the grid 140 or the load 150 through the DC-DC converter circuit 1302 and the DC-AC converter circuit 1303 within the power converter 130.

[0056] The above example uses a power converter 130 that includes both a DC-DC converter circuit 1302 and a DC-AC converter circuit 1303. In another embodiment, the power converter 130 may include a DC-DC converter circuit 1302 but not a DC-AC converter circuit 1303. The electrical energy generated by the photovoltaic array 110 is input to the energy storage device or a DC load after passing through the DC-DC converter circuit 1302.

[0057] In this embodiment, the power converter 130 can adjust the output power of the photovoltaic module 111 through the maximum power point tracking (MPPT) algorithm, so that the photovoltaic module 111 operates at the peak point or peak region of the PV curve (power-voltage curve), ensuring that the photovoltaic module 111 is always in the optimal operating state.

[0058] This application does not limit the type of photovoltaic system. For example, the photovoltaic system can be a string photovoltaic system or a centralized photovoltaic system. In a string photovoltaic system, one or more photovoltaic strings are connected to an inverter and output one AC power. Multiple AC power sources are combined, meaning the string photovoltaic system combines power on the AC side. In a centralized photovoltaic system, multiple photovoltaic strings are connected in parallel, and the DC power output from the multiple photovoltaic strings is combined to an inverter. The inverter performs DC-AC conversion and outputs AC power, meaning the centralized photovoltaic system combines power on the DC side. Regardless of whether it is a string photovoltaic system or a centralized photovoltaic system, an isolating switch is connected between the photovoltaic strings and the inverter.

[0059] The foregoing provides general application scenarios for embodiments of this application. As needed, components / devices may be added, removed, or eliminated in the above application scenarios.

[0060] Figure 2 The diagram illustrates the framework structure of a conventional photovoltaic system, which may be, for example, a string photovoltaic system.

[0061] like Figure 2 As shown, the photovoltaic system includes multiple photovoltaic strings, such as photovoltaic string 1 to photovoltaic string n. Each photovoltaic string includes multiple photovoltaic modules connected in series (represented by "+" and "-" symbols). The photovoltaic conversion system in this system includes disconnecting switches and multiple DC-DC conversion circuits. The disconnecting switch has multiple switching poles, such as switch pole 1, switch pole 2, ..., switch pole n-1 and switch pole n, where each switch pole is provided with a moving and stationary contact assembly. These switching poles are driven by an operating mechanism to separate or contact the moving and stationary contact assemblies to achieve synchronous closing or synchronous opening. These DC-DC conversion circuits are, for example, DC-DC conversion circuit 1 to DC-DC conversion circuit m. Schematic, one DC-DC conversion circuit can be connected to every two switching poles.

[0062] like Figure 2As shown, the positive terminal of each photovoltaic string can be connected to one switch terminal of the isolating switch, and the negative terminal of the photovoltaic string can be connected to the other switch terminal of the isolating switch. Therefore, one photovoltaic string is connected to two switch terminals. By connecting the positive and negative terminals of the photovoltaic string to different switch terminals respectively, when the isolating switch is opened, isolation breaks can be formed in both the positive and negative circuits, so that neither the positive nor negative terminals are grounded, thus meeting the product specifications.

[0063] Figure 2 In the conventional scheme shown, each switch pole of the disconnector supports only one independent current loop. However, to match the increased power generation requirements, at a certain voltage level, the number of photovoltaic units connected to the disconnector needs to be increased, and correspondingly, the number of switch poles of the disconnector must also increase. However, increasing the number of switch poles often leads to problems such as increased size of the disconnector, accelerated temperature rise, and reduced reliability. In addition, a larger number of switch poles results in a longer operating mechanism, which may prevent the operating mechanism from reliably driving the switch poles, thus causing the disconnector to fail to open and close reliably.

[0064] In view of this, the present application provides an isolating switch that, by designing two (or more) contact assemblies in one switching pole, enables multiple independent current loops to be supported in one switching pole. This allows for an increase in the number of photovoltaic units connected to the switching pole without increasing the number of switching poles, thereby avoiding the aforementioned defects of conventional solutions and meeting the high-power supply requirements of the current photovoltaic power generation field.

[0065] The application scenarios of the disconnecting switch according to the embodiments of this application will be described first, followed by the mechanical structure of the disconnecting switch. In the following embodiments, the photovoltaic unit connected to the disconnecting switch is a photovoltaic string as an example.

[0066] Figure 3 The illustration shows the frame structure of a photovoltaic system 10 according to one embodiment of this application. For example... Figure 3 As shown, the photovoltaic system 10 may include photovoltaic strings and a photovoltaic conversion system 14. The photovoltaic strings may include, for example, photovoltaic strings 11 and 12. The photovoltaic conversion system 14 includes an isolating switch 13 and a DC-DC conversion circuit 140, with the isolating switch 13 connecting the photovoltaic strings and the DC-DC conversion circuit 140. Schematic, the photovoltaic system 10 may be a string photovoltaic system. It is understood that this is merely illustrative and not a limitation of this embodiment; the photovoltaic system 10 may be any other type of photovoltaic system, such as a centralized photovoltaic system. The photovoltaic conversion system 14 may be, for example, a power converter, such as an inverter or an energy storage converter.

[0067] Figure 3The illustration shows two photovoltaic strings, photovoltaic string 11 and photovoltaic string 12. This is merely illustrative and not a limitation of this embodiment. In practice, the number of photovoltaic strings can be one or more. Figure 3 A DC-DC converter circuit 140 is shown, but this is merely an illustration; in practice, multiple DC-DC converter circuits can be used. The DC-DC converter circuit here can be an MPPT circuit. The following embodiments will describe the connection method between the isolating switch 13 and multiple DC-DC converter circuits. Additionally, Figure 3 The DC-AC conversion circuit is not shown; this is merely an example. In reality, the photovoltaic conversion system 14 may also include a DC-AC conversion circuit.

[0068] like Figure 3 As shown, the disconnecting switch 13 may include multiple switching poles. Figure 3 The diagram schematically shows switch poles P1 and P2. The individual switch poles are electrically isolated (or electrically isolated from each other). Figure 3 The number of switch poles shown is merely illustrative and not a limitation of this embodiment. In practice, the number of switch poles within the isolating switch 13 can be set as needed. For distinction, switch pole P1 can be referred to as the first switch pole, and switch pole P2 as the second switch pole.

[0069] like Figure 3 As shown, each switch pole may include two contact assemblies, which can be referred to as the first contact assembly and the second contact assembly, respectively. For example, switch pole P1 includes the first contact assembly C1 and the second contact assembly C2, and switch pole P2 includes the first contact assembly C3 and the second contact assembly C4. The first contact assembly and the second contact assembly are electrically isolated, and the circuits in which they belong are electrically isolated. Both the first contact assembly and the second contact assembly include a moving contact and a stationary contact, which can be in contact with or separated from each other. In each contact assembly, when the moving contact and the stationary contact are in contact, the contact assembly is closed (or called closed); when the moving contact and the stationary contact are separated, the contact assembly is open (or called open).

[0070] It is understandable that naming the contact assemblies within each switch pole as the first contact assembly and the second contact assembly is merely for ease of distinction, and does not imply any difference in the relative positions or connections of the contact assemblies. For example, in Figure 3 In the circuit, the first contact assembly of switch P1 can also be contact assembly C2, and the second contact assembly can also be contact assembly C1; the first contact assembly of switch P2 can also be contact assembly C4, and the second contact assembly can also be contact assembly C3.

[0071] Figure 3The illustration shows two contact assemblies within each switch pole. This is merely illustrative and not a limitation of this embodiment. In practice, the number of contact assemblies within any switch pole can be three or more. Furthermore, the number of contact assemblies within each switch pole can be the same or not entirely the same.

[0072] like Figure 3 As shown, the disconnector switch 13 may further include an operating mechanism connected to all moving contacts within each switch pole. This operating mechanism is used to drive all moving contacts within each switch pole to move under manual operation by the user, causing the moving contacts to contact or separate from the stationary contacts. Specifically, this operating mechanism can synchronize the movement of all moving contacts in the disconnector switch 13, allowing all moving contacts to simultaneously contact or separate from their corresponding stationary contacts, thereby achieving simultaneous closing or opening of each switch pole, and thus closing or disconnecting the disconnector switch 13.

[0073] like Figure 3 As illustrated, the isolating switch 13 may also include a trip unit. The photovoltaic conversion system 14 (e.g., a power converter) may also have remote tripping capability. When the control module in the power converter detects an abnormality (e.g., reverse connection of the photovoltaic string, short circuit, etc.), the control module sends a remote tripping command to the trip unit. Upon responding to the remote tripping command, the trip unit trips, causing the operating mechanism to drive all moving contacts in all switch poles to separate from their corresponding stationary contacts, thereby disconnecting the isolating switch 13 and electrically isolating the photovoltaic string from the power converter. Illustratively, this control module may be integrated into the DC-DC conversion circuit 140. Alternatively, the control module may be independent of the DC-DC conversion circuit 140.

[0074] like Figure 3 As shown, the first contact assembly C1 of switch P1 can connect the positive terminal of photovoltaic string 11 to the positive input terminal of DC-DC converter circuit 140, and the second contact assembly C2 of switch P1 can connect the positive terminal of photovoltaic string 12 to the positive input terminal of DC-DC converter circuit 140. The two contact assemblies within switch P1 are connected to the same polarity electrodes of the two photovoltaic strings. The first contact assembly C3 of switch P2 can connect the negative terminal of photovoltaic string 11 to the negative input terminal of DC-DC converter circuit 140, and the second contact assembly C4 of switch P2 can connect the negative terminal of photovoltaic string 12 to the negative input terminal of DC-DC converter circuit 140. The two contact assemblies within switch P2 are connected to the same polarity electrodes of the two photovoltaic strings. By connecting the two contact assemblies within the same switch pole to the same polarity electrodes, it is beneficial to achieve electrical isolation between the two circuits containing the two contact assemblies.

[0075] Figure 3In the illustrated embodiment, by integrating multiple electrically isolated contact assemblies within the internal space of a single switch electrode, with each contact assembly connected to one electrode of a photovoltaic string, the number of photovoltaic strings connected to the isolating switch can be increased without increasing the number of switch electrodes, or conversely, the number of switch electrodes can be reduced while maintaining the same number of photovoltaic strings connected to the isolating switch 13. For example, compare... Figure 2 and Figure 3 As shown, in the traditional scheme, the ratio of photovoltaic strings to switch electrodes is 1:2, but in this embodiment, the ratio is 1:1. That is, in this embodiment, the number of switch electrodes required for the same number of photovoltaic strings is half that of the traditional scheme.

[0076] In this embodiment, through a reasonable structural design, the internal space of a single switch electrode can be fully utilized to arrange multiple contact components, ensuring that the size of a single switch electrode does not increase or remains essentially unchanged. Therefore, the solution in this embodiment can increase the number of photovoltaic strings connected to the disconnecting switch without increasing its size, thereby improving power generation. Furthermore, by rationally designing the number of photovoltaic strings connected to a single switch electrode, the rated current of the single switch electrode can be kept relatively low, resulting in lower heat generation, which helps ensure performance and reduce costs.

[0077] In summary, the solution in this embodiment can improve upon the problems of conventional solutions, such as large size of the disconnecting switch, increased temperature rise, and low reliability, and can meet the high-power power supply needs of the current photovoltaic power generation field.

[0078] based on Figure 3 The embodiment shown, Figure 4 The diagram illustrates the frame structure of a photovoltaic system 10 according to another embodiment of this application.

[0079] like Figure 4As shown, the photovoltaic conversion system 14 includes a DC-DC conversion circuit 141 (or the first DC-DC conversion circuit 141) and a DC-DC conversion circuit 142 (or the second DC-DC conversion circuit 142). The first contact assembly C1 of the switch P1 (or the first switch P1) can be connected to the positive terminal of the photovoltaic string 11 and the positive input terminal of the DC-DC conversion circuit 141, and the second contact assembly C2 of the switch P1 can be connected to the negative terminal of the photovoltaic string 11 and the negative input terminal of the DC-DC conversion circuit 141. The two contact assemblies in the switch P1 are respectively connected to the same photovoltaic string 11. The positive and negative electrodes of the photovoltaic string. The first contact assembly C3 of the switch P2 (or the second switch P2) can connect the positive terminal of the photovoltaic string 12 to the positive input terminal of the DC-DC converter circuit 142, and the second contact assembly C4 of the switch P2 can connect the negative terminal of the photovoltaic string 12 to the negative input terminal of the DC-DC converter circuit 142. The two contact assemblies within the switch P2 are respectively connected to the positive and negative electrodes of the same photovoltaic string. By having the two contact assemblies within the same switch electrode respectively connected to the positive and negative electrodes of the same photovoltaic string, it is beneficial to simplify the connection between the photovoltaic string and the switch electrode and improve the system deployment efficiency.

[0080] like Figure 4 As shown, schematically, both DC-DC converter circuit 141 and DC-DC converter circuit 142 can detect abnormalities and send remote trip commands to the trip unit. Figure 4 In the illustrated embodiment, the two contact assemblies of a single switch electrode can be connected to the same DC-DC converter circuit; this is merely an example. In another embodiment, the two contact assemblies of a single switch electrode can be connected to two separate DC-DC converter circuits.

[0081] based on Figure 4 The illustrated embodiment can be obtained Figure 5 Another embodiment is shown.

[0082] like Figure 5As shown, the first contact assembly C1 of switch P1 can be connected to the positive terminal of photovoltaic string 11 and the positive input terminal of DC-DC converter circuit 141, and the second contact assembly C2 of switch P1 can be connected to the negative terminal of photovoltaic string 12 and the negative input terminal of DC-DC converter circuit 141. The two contact assemblies within switch P1 are respectively connected to the positive and negative electrodes of different photovoltaic strings. Similarly, the first contact assembly C3 of switch P2 can be connected to the positive terminal of photovoltaic string 12 and the positive input terminal of DC-DC converter circuit 142, and the second contact assembly C4 of switch P2 can be connected to the negative terminal of photovoltaic string 11 and the negative input terminal of DC-DC converter circuit 142. In other words, the two contact assemblies within switch P2 are respectively connected to the positive and negative electrodes of different photovoltaic strings. By connecting the two contact assemblies within the same switch to the positive and negative electrodes of different photovoltaic strings, product requirements in certain scenarios can be met.

[0083] As above Figures 3-5 In the illustrated embodiment, the number of photovoltaic strings connected to the isolating switch 13 is even, and the isolating switch 13 can be connected to one or more DC-DC converter circuits. Figure 6a In the embodiment shown, the number of photovoltaic strings connected to the isolating switch 13 can also be an odd number, and the isolating switch 13 can also be connected to one or more DC-DC conversion circuits.

[0084] Figure 6a The diagram illustrates three photovoltaic strings, 11 through 13, in photovoltaic system 10. The first contact assembly C1 of switch P1 connects the positive terminal of photovoltaic string 11 to the positive input terminal of DC-DC converter circuit 140, and the second contact assembly C2 connects the positive terminal of photovoltaic string 12 to the positive input terminal of DC-DC converter circuit 140. The two contact assemblies within switch P1 are respectively connected to the same polarity electrodes of the two photovoltaic strings. The first contact assembly C3 of switch P2 connects the negative terminal of photovoltaic string 11 to the negative input terminal of DC-DC converter circuit 140, and the second contact assembly C4 of switch P2 connects the negative terminal of photovoltaic string 12 to the negative input terminal of DC-DC converter circuit 140. In other words, the two contact assemblies within switch P2 are respectively connected to the same polarity electrodes of the two photovoltaic strings. The first contact assembly C5 of the switch P3 can be connected to the positive terminal of the photovoltaic string 13 and the positive input terminal of the DC-DC converter circuit 140, and the second contact assembly C6 of the switch P3 can be connected to the negative terminal of the photovoltaic string 13 and the negative input terminal of the DC-DC converter circuit 140. That is, the two contact assemblies in the switch P3 are respectively connected to the opposite electrodes of the same photovoltaic string.

[0085] Understandably, when the number of photovoltaic strings is further increased, for example to 5, Figure 6aThe circuit connection architecture shown remains applicable. Alternatively, one DC-DC converter circuit 140 can be replaced with multiple DC-DC converter circuits, such that each DC-DC converter circuit is connected to one or more switching terminals.

[0086] based on Figure 6a As shown, we can obtain Figure 6b The example shown. In Figure 6b In the embodiments shown, photovoltaic strings 11 to 13 can be referred to as the first photovoltaic string (or the first photovoltaic unit), the second photovoltaic string (or the second photovoltaic unit), and the third photovoltaic string (or the third photovoltaic unit), respectively.

[0087] like Figure 6b As shown, the first contact assembly C1 of the switch P1 can be connected to the positive terminal of the photovoltaic string 11 and the positive input terminal of the DC-DC converter circuit 140, and the second contact assembly C2 of the switch P1 can be connected to the positive terminal of the photovoltaic string 12 and the positive input terminal of the DC-DC converter circuit 140.

[0088] and Figure 6a The difference shown is as follows, Figure 6b As shown, the first contact assembly C3 of the switch P2 can be connected to the negative terminal of the photovoltaic string 11 and the negative input terminal of the DC-DC converter circuit 140, and the second contact assembly C4 of the switch P2 can be connected to the negative terminal of the photovoltaic string 13 and the negative input terminal of the DC-DC converter circuit 140.

[0089] like Figure 6b As shown, illustratively, the negative terminal of photovoltaic string 12 and the positive terminal of photovoltaic string 13 can be connected to switch P3. For example, the negative terminal of photovoltaic string 12 can be connected to the second contact assembly C6 of switch P3, and the positive terminal of photovoltaic string 13 can be connected to the first contact assembly C5 of switch P3. It is understood that connecting the negative terminal of photovoltaic string 12 and the positive terminal of photovoltaic string 13 to the same switch is merely an example. In practice, depending on the needs, the negative terminal of photovoltaic string 12 and the positive terminal of photovoltaic string 13 can also be connected to different switch terminals.

[0090] like Figure 6a and Figure 6b As shown, switch P1 and switch P2 can be referred to as the first switch and the second switch, respectively. Both the first and second switches are connected to the same polarity electrodes of two photovoltaic strings. Switch P3 can be referred to as the third switch, which is connected to the opposite polarity electrodes of one or two photovoltaic strings.

[0091] In the above embodiments, one contact assembly can connect to the electrodes of a single photovoltaic string. In the following embodiments, one contact assembly can connect to the electrodes of multiple photovoltaic strings. This will be described in detail below.

[0092] Figure 7 The diagram illustrates the frame structure of a photovoltaic system 10 according to another embodiment of this application. For example... Figure 7 As shown, the disconnecting switch 13 includes multiple switching poles, such as switching pole P1, switching pole P2, ..., switching pole Pn-1, switching pole Pn. Figure 7 Several DC-DC conversion circuits are also illustrated, such as DC-DC conversion circuit 141 and DC-DC conversion circuit 142. Figure 7 The diagram also illustrates a DC-AC conversion circuit 143, with both DC-DC conversion circuits 141 and 142 connected to the DC-AC conversion circuit 143.

[0093] like Figure 7 As shown, photovoltaic strings 21 and 22 are connected in parallel, and the positive terminals of both strings are connected to the first contact assembly C1 of switch P1. Photovoltaic strings 23 and 24 are connected in parallel, and the positive terminals of both strings are connected to the second contact assembly C2 of switch P1. The first contact assembly C1 and the second contact assembly C2 are connected to the positive input terminal of DC-DC converter circuit 141.

[0094] like Figure 7 As shown, the negative terminals of photovoltaic string 21 and photovoltaic string 22 are both connected to the first contact assembly C3 of switch P2. The negative terminals of photovoltaic string 23 and photovoltaic string 24 are both connected to the second contact assembly C4 of switch P2. The first contact assembly C3 and the second contact assembly C4 are connected to the negative input terminal of DC-DC converter circuit 141.

[0095] like Figure 7 As shown, schematically, each DC-DC converter circuit can send a remote trip command to the trip unit. However, this is merely an example; in reality, the DC-AC converter circuit 143 can also send a remote trip command to the trip unit.

[0096] Figure 7 In the illustrated embodiment, the positive or negative terminal of two photovoltaic strings connected in parallel can be connected to a contact assembly, and all photovoltaic strings can be connected to the isolating switch 13 in this manner. In another embodiment, a portion of the photovoltaic strings can be connected according to... Figure 7 The isolating switch 13 is connected in the manner shown; another part of the photovoltaic string can be connected to the isolating switch 13 in other ways, such as according to... Figure 3 - Connect the isolating switch 13 in any of the ways shown in Figure 6. That is, the other part of the photovoltaic string can be connected in parallel, and different photovoltaic strings can be connected to different contact assemblies.

[0097] In a series of photovoltaic (PV) strings connected in parallel, when one string experiences an anomaly (such as a short circuit or reverse connection), current from the other strings will flow into the affected string; this phenomenon is called backflow. Backflow can damage PV strings and affect the performance of the PV system. To mitigate the impact of backflow, such as... Figure 7 As shown, no more than two photovoltaic (PV) strings can be connected in parallel. This ensures that even if backflow occurs, only one PV string (e.g., PV string 21) will backflow into the other faulty PV string (e.g., PV string 22), preventing other PV strings from backflowing into the faulty string. Since this "1-to-1" configuration meets the PV string's tolerance threshold for backflow current, it will not damage the PV string and avoids failure caused by excessive current.

[0098] According to product requirements, in one embodiment, the disconnecting switch 13 is provided with at least one such contact assembly, which is connected to the positive or negative terminal of three or more photovoltaic modules connected in series or parallel.

[0099] Figure 7 The illustrated embodiments and their derivative embodiments, by connecting at least two photovoltaic strings in parallel to a single contact assembly, can increase the number of photovoltaic strings connected to the disconnector switch 13. This facilitates matching with high-power power converters, meets the high-power supply demands of the current photovoltaic power generation field, and ensures that the number of switching poles of the disconnector switch 13 is relatively small. For example, compared to... Figure 7 and Figure 2 As shown, assuming the number of switching electrodes is the same (assuming it is n), Figure 7 The number of photovoltaic strings connected to the isolating switch 13 is 2n, while Figure 2 The number of photovoltaic strings connected to the isolating switch 13 is n. In other words, under the premise of the same number of photovoltaic strings connected, Figure 7 The number of switching poles of the disconnecting switch 13 is Figure 2 The number of poles of the isolating switch is half of the number of poles.

[0100] based on Figure 7 The illustrated embodiment can be obtained Figure 8 The example shown.

[0101] like Figure 8As shown, the positive terminal of the photovoltaic string 21 and photovoltaic string 22 connected in parallel is connected to the first contact assembly C1 of the switch P1. The negative terminal of the photovoltaic string 21 and photovoltaic string 22 connected in parallel is connected to the second contact assembly C2 of the switch P1. The positive terminal of the photovoltaic string 23 and photovoltaic string 24 connected in parallel is connected to the first contact assembly C3 of the switch P2. The negative terminal of the photovoltaic string 23 and photovoltaic string 24 connected in parallel is connected to the second contact assembly C4 of the switch P2. The first contact assembly C1 and the first contact assembly C3 can be connected to the positive input terminal of the DC-DC converter circuit 141. The second contact assembly C2 and the second contact assembly C4 can be connected to the negative input terminal of the DC-DC converter circuit 141. By connecting the positive and negative terminals of multiple photovoltaic strings connected in parallel to two contact assemblies within the same switch pole, not only can the number of photovoltaic strings connected to the isolating switch 13 be increased, but the connection between the photovoltaic strings and the switch pole is also simplified, improving system deployment efficiency.

[0102] Figure 8 In the illustrated embodiment, each switch is connected to both the positive and negative terminals of multiple photovoltaic strings connected in parallel; this is merely an example. In another embodiment, the switches can be... Figure 5 The illustrated embodiments and Figure 8 The illustrated embodiments combine the following: the positive (or negative) terminals of multiple photovoltaic strings connected in parallel can be connected to a contact assembly of a switch electrode, and the negative (or positive) terminals of the multiple photovoltaic strings connected in parallel can be connected to a contact assembly of another switch electrode.

[0103] Figure 7 and Figure 8 In the illustrated embodiments and their derivative embodiments, one contact assembly can be connected to the electrodes of multiple photovoltaic strings connected in parallel. In another embodiment, one contact assembly can connect to the electrodes of multiple photovoltaic strings, but these multiple photovoltaic strings are not connected in parallel. That is, the positive (or negative) terminals of the multiple photovoltaic strings are connected to one contact assembly A, but the negative (or positive) terminals of the multiple photovoltaic strings are connected to different contact assemblies B. This embodiment can also improve power generation and meet product requirements in some scenarios.

[0104] Figure 9 , Figure 10 , Figure 11 This is a schematic diagram of the structure of a disconnector switch 13 according to an embodiment of this application. Figures 9-11 As shown, the disconnector switch 13 may include an operating mechanism 131, a cover 132, and multiple switch poles, such as switch poles P1 to Pn. These switch poles can be stacked sequentially, with switch poles P1 and Pn being the first and last switch poles, respectively. The cover 132 can cover switch pole P1 to encapsulate and protect its internal structure. In another embodiment, depending on the product's structural design requirements, the cover 132 may not be provided.

[0105] like Figure 10 As shown, the operating mechanism 131 may include an operating device 131a and a transmission shaft 131b, and the operating device 131a and the transmission shaft 131b are connected.

[0106] like Figure 10 As shown, the operating device 131a can be assembled from several components, such as a handle 131c. When the user rotates the handle 131c, the drive shaft 131b rotates accordingly. The direction of extension of the axis of the drive shaft 131b can be referred to as the axial direction of the drive shaft 131b. This embodiment does not limit the specific structure of the operating device 131a.

[0107] like Figure 10 and Figure 11 As shown, the drive shaft 131b can be roughly cylindrical, and its cross-section (perpendicular to the axial direction) can be roughly rectangular. The drive shaft 131b can be connected to all the switch poles, and all the switch poles can be stacked sequentially along the axial direction of the drive shaft 131b, forming a structure similar to a skewer of candied hawthorns. Therefore, it can also be said that all the switch poles are sequentially stacked and connected in series on the drive shaft 131b. The drive shaft 131b can pass through the cover 132 and connect to the operating device 131a. When used to operate the handle 131c, the drive shaft 131b can drive each switch pole to simultaneously close or open.

[0108] Figure 12 and Figure 13 Taking switch P1 as an example, the structure of the switch in disconnector 13 is illustrated. Figure 12 and Figure 13 As shown, the switch pole P1 may include a housing 133a, a transmission seat 133d, a first contact assembly C1 and a second contact assembly C2. The transmission seat 133d may be located inside the housing 133a, and most of the structure of the first contact assembly C1 and most of the structure of the second contact assembly C2 may be located inside the housing 133a.

[0109] like Figure 13 As shown schematically, the housing 133a can be a box-like structure with an opening. The housing 133a is provided with a through hole h1 through which the drive shaft 131b can pass, and the shape of the through hole h1 can be adapted to the shape of the drive shaft 131b.

[0110] like Figure 13 As shown schematically, the transmission seat 133d can be formed by connecting a circular plate and a cylindrical structure, and the transmission seat 133d has a through hole h2 through which the transmission shaft 131b can pass. (Combined) Figure 13 and Figure 12 As shown, the transmission seat 133d can be movably installed inside the housing 133a, with the through hole h2 aligned with the through hole h1. (This is followed by a seemingly unrelated sentence fragment: "Combined...") Figures 11-13As shown, the drive shaft 131b passes through through holes h1 and h2 and is fixedly connected to the drive seat 133d. The drive shaft 131b can drive the drive seat 133d to rotate.

[0111] like Figure 13 As shown schematically, the first contact assembly C1 may include a stationary contact 133b, a moving contact 133c, a first flexible connection portion 133j, and a first terminal block 133i, which can be connected in sequence.

[0112] Combination Figure 13 and Figure 12 As shown, the stationary contact 133b can be fixed to the housing 133a, and a part of the stationary contact 133b can be located inside the housing 133a, while the other part can be exposed outside the housing 133a.

[0113] Combination Figure 13 and Figure 12 As shown, the moving contact 133c can be fixed to the transmission base 133d, for example, by means of a pin. The moving contact 133c can be located inside the housing 133a.

[0114] Combination Figure 13 and Figure 12 As shown, the first terminal 133i can be fixed inside the housing 133a and can be exposed from the housing 133a.

[0115] In this embodiment, the stationary contact 133b is used to connect the photovoltaic string to one of the DC-DC converter circuits, and the first terminal 133i is used to connect the photovoltaic string to the other of the DC-DC converter circuits. According to the circuit connection architecture of the photovoltaic system 10 in the different embodiments described above, both the stationary contact 133b and the first terminal 133i can be connected to the positive terminal of the photovoltaic string, or both can be connected to the negative terminal of the photovoltaic string.

[0116] like Figure 13 As shown, the first flexible connection part 133j connects the first terminal 133i and the moving contact 133c, and conducts electricity between them. The first flexible connection part 133j has flexible deformation properties, and can be, for example, a cable.

[0117] In another embodiment, the structure of the first contact assembly C1 is not limited to that described above. For example, the first flexible connection portion 133j can be omitted, and the moving contact 133c can include a flexibly deformable portion, such as a spring. This flexibly deformable portion functions as the first flexible connection portion 133j. Based on this, when the disconnecting switch 13 is a board-mounted switch, the first terminal 133i can also be omitted, and a portion of the moving contact 133c can be exposed outside the housing 133a and soldered to the circuit board. In this board-mounted switch, the stationary contact 133b is also soldered to the circuit board.

[0118] like Figure 13 As shown schematically, the second contact assembly C2 may include a second terminal block 133e, a second flexible connection part 133f, a moving contact 133g, and a stationary contact 133h, which can be connected in sequence.

[0119] Combination Figure 13 and Figure 12 As shown, the second terminal 133e can be fixed to the housing 133a, and a part of the second terminal 133e can be located inside the housing 133a, while the other part can be exposed outside the housing 133a.

[0120] Combination Figure 13 and Figure 12 As shown, the moving contact 133g can be fixed to the transmission base 133d, for example, by a pin. The moving contact 133g can be located inside the housing 133a. The second flexible connection part 133f connects the second terminal 133e and the moving contact 133g, and conducts electricity between them. The second flexible connection part 133f has flexible deformation properties, and can be, for example, a cable.

[0121] Combination Figure 13 and Figure 12 As shown, the stationary contact 133h can be fixed inside the housing 133a and can be exposed from the housing 133a.

[0122] In this embodiment, the second terminal 133e is used to connect the photovoltaic string to one of the DC-DC converter circuits, and the stationary contact 133h is used to connect the photovoltaic string to the other of the DC-DC converter circuits. According to the circuit connection architecture of the photovoltaic system 10 in the different embodiments described above, both the second terminal 133e and the stationary contact 133h can be connected to the positive terminal of the photovoltaic string, or both the stationary contact 133b and the first terminal 133i can be connected to the negative terminal of the photovoltaic string.

[0123] In another embodiment, the structure of the second contact assembly C2 is not limited to that described above. For example, the second flexible connection portion 133f can be omitted, and the moving contact 133g can include a flexibly deformable portion, such as a spring. This flexibly deformable portion functions as the second flexible connection portion 133f. Based on this, when the disconnecting switch 13 is a board-mounted switch, the second terminal 133e can also be omitted, and a portion of the moving contact 133g can be exposed outside the housing 133a and soldered to the circuit board. In this board-mounted switch, the stationary contact 133h is also soldered to the circuit board.

[0124] like Figure 13As shown, the first contact assembly C1 and the second contact assembly C2 can be approximately centrally symmetrical, and their center of symmetry can approximately coincide with the center of the transmission seat 133d, or in other words, approximately located on the axis of the transmission shaft 131b.

[0125] Combination Figure 11 and Figure 12 As shown, the drive shaft 131b passes through the drive seat 133d. The first contact assembly C1 and the second contact assembly C2 can be distributed on both sides of the drive shaft 131b. The surfaces where the first contact assembly C1 and the second contact assembly C2 are located can intersect the axial direction of the drive shaft 131b, for example, perpendicularly or approximately perpendicularly. Alternatively, the first contact assembly C1 and the second contact assembly C2 can be located on a surface perpendicular or approximately perpendicular to the axial direction of the drive shaft 131b. Since the stacking direction of the switch poles in the disconnector switch 13 is the axial direction of the drive shaft 131b, it can also be said that the first contact assembly C1 and the second contact assembly C2 in each switch pole can be located on a surface perpendicular or approximately perpendicular to this stacking direction.

[0126] Figure 12 This indicates that both the first contact assembly C1 and the second contact assembly C2 in the switch pole P1 are closed, that is, the moving contact 133c in the first contact assembly C1 is in contact with the stationary contact 133b, and the moving contact 133g in the second contact assembly C2 is in contact with the stationary contact 133h.

[0127] Combination Figure 11 and Figure 12 As shown, when it is necessary to disconnect switch P1, the user can rotate the operating device 131a, causing the drive shaft 131b to drive the drive seat 133d to rotate, for example, in a counterclockwise direction. It can be understood that the drive seat 133d can rotate on a surface intersecting the axial direction of the drive shaft 131b, which may be approximately perpendicular to that axial direction. The drive seat 133d can drive the moving contact 133c and the moving contact 133g to rotate simultaneously, causing the moving contact 133c to separate from the stationary contact 133b and the moving contact 133g to separate from the stationary contact 133h, thereby simultaneously disconnecting the first contact assembly C1 and the second contact assembly C2. Figure 14 As shown. During the disconnection process, the first flexible connection portion 133j and the second flexible connection portion 133f undergo flexible deformation to adapt to the movement of the moving contacts they are connected to.

[0128] like Figure 14As shown, after switch P1 is opened, an electrical insulation gap, or break point (or fracture point), is formed between the moving contact 133c and the stationary contact 133b of the first contact assembly C1, and a break point is formed between the moving contact 133g and the stationary contact 133h of the second contact assembly C2. The single-break point design of each contact assembly results in fewer contact points, thus lower contact resistance, less heat generation, and a simpler structure for the contact assembly.

[0129] Combination Figure 14 and Figure 12 As easily understood, when it is necessary to close switch P1, the user can rotate the operating device 131a in the reverse direction, causing the transmission shaft 131b to drive the transmission seat 133d to rotate in the reverse direction, for example, clockwise. The transmission seat 133d can drive the moving contact 133c and the moving contact 133g to rotate in the opposite direction simultaneously, so that the moving contact 133c contacts the stationary contact 133b, and the moving contact 133g contacts the stationary contact 133h, thereby closing the first contact assembly C1 and the second contact assembly C2 simultaneously. During the closing process, the first flexible connection part 133j and the second flexible connection part 133f will undergo flexible deformation to adapt to the movement of the moving contacts they are connected to.

[0130] Since all the switching poles are connected in series on the drive shaft 131b, the drive shaft 131b can simultaneously drive the transmission seat in each switching pole to rotate, so that all the switching poles can be opened or closed at the same time, thereby realizing the opening or closing of the disconnecting switch 13. In this embodiment, multiple switching poles are driven to operate simultaneously by a single drive shaft 131b, which has a relatively simple structure and good consistency of operation of each switching pole, resulting in high reliability of the disconnecting switch 13.

[0131] In this embodiment, the axial direction of the drive shaft 131b can be used as the thickness direction of the disconnector switch 13. Since the two contact assemblies in each switch pole are arranged on a plane perpendicular to this axial direction, although multiple contact assemblies are provided in the switch pole, they do not occupy the dimension in the thickness direction. Therefore, the thickness dimension of the switch pole will not increase significantly, thus ensuring that the thickness dimension of the disconnector switch remains essentially unchanged. In addition, by making full use of the internal space of the switch pole to arrange multiple contact assemblies, the length and width dimensions of the switch pole will not increase significantly, thus ensuring that the length and width dimensions of the disconnector switch remain essentially unchanged.

[0132] In this embodiment, by rationally designing the number of photovoltaic strings connected to the switch electrode, the rated current of the switch electrode can be reduced, thereby reducing heat generation, which helps to ensure performance and reduce costs. For example, combined with Figure 7 and Figure 12 , can be adopted Figure 7The connection method allows each contact assembly of the switch P1 to be connected to two photovoltaic strings. If the current of each photovoltaic string is 15A, then this makes the rated current of each contact assembly 30A, which can meet mainstream requirements.

[0133] In summary, the solution of this embodiment can ensure that the volume of the disconnecting switch 13 remains basically unchanged, which is beneficial to improving the temperature rise and reliability of the disconnecting switch 13.

[0134] based on Figure 14 The embodiment shown, Figure 15 This illustration shows the planar assembly structure of the switch P1 and the drive shaft 131b in another embodiment of this application.

[0135] like Figure 15 As shown, the transmission base in switch P1 may include a first transmission base 133k and a second transmission base 133m, which are respectively located on both sides of the transmission shaft 131b. Schematic, the first transmission base 133k, the second transmission base 133m, and the transmission shaft 131b may each include a gear portion with meshing teeth. The meshing teeth of the first transmission base 133k and the second transmission base 133m mesh with the meshing teeth of the transmission shaft 131b. Therefore, the transmission shaft 131b can drive the first transmission base 133k and the second transmission base 133m to rotate through meshing transmission. Figure 15 The dashed arrow in the middle indicates one direction of rotation of the drive shaft 131b, the first drive seat 133k, and the second drive seat 133m.

[0136] like Figure 15 As shown, the moving contact 133c of the first contact assembly C1 can be fixed to the first transmission base 133k. The moving contact 133g of the second contact assembly C2 can be fixed to the second transmission base 133m. Figure 15 In the state shown, both the first contact assembly C1 and the second contact assembly C2 are in the closed state.

[0137] like Figure 15As shown, when it is necessary to disconnect switch P1, the user can rotate the drive shaft 131b. The drive shaft 131b can drive the first drive seat 133k and the second drive seat 133m to rotate simultaneously. For example, if the drive shaft 131b can rotate clockwise, then the first drive seat 133k can rotate counterclockwise, and the second drive seat 133m can rotate counterclockwise. It can be understood that both the first drive seat 133k and the second drive seat 133m can rotate on a surface intersecting the axial direction of the drive shaft 131b, which can be approximately perpendicular to that axial direction. The first drive seat 133k can drive the moving contact 133c to rotate, while the second drive seat 133m can drive the moving contact 133g to rotate, causing the moving contact 133c to separate from the stationary contact 133b, and the moving contact 133g to separate from the stationary contact 133h, thereby simultaneously disconnecting the first contact assembly C1 and the second contact assembly C2. Figure 16 As shown. During the disconnection process, the first flexible connection portion 133j and the second flexible connection portion 133f undergo flexible deformation to adapt to the movement of the moving contacts they are connected to.

[0138] like Figure 16 As shown, after switch P1 is opened, a break point is formed between the moving contact 133c and the stationary contact 133b of the first contact assembly C1, and a break point is formed between the moving contact 133g and the stationary contact 133h of the second contact assembly C2. The single-break point design of each contact assembly results in lower contact resistance and less heat generation due to fewer contact points, and the structure of the contact assembly is relatively simple.

[0139] Combination Figure 16 and Figure 15 As easily understood, when it is necessary to close switch P1, the user can rotate the drive shaft 131b in the opposite direction. The drive shaft 131b drives the first drive seat 133k and the second drive seat 133m to rotate in the opposite direction simultaneously. For example, if the drive shaft 131b can rotate counterclockwise, then the first drive seat 133k can rotate clockwise, and the second drive seat 133m can rotate clockwise. The first drive seat 133k can drive the moving contact 133c to rotate in the opposite direction, and at the same time, the second drive seat 133m can drive the moving contact 133g to rotate in the opposite direction, so that the moving contact 133c contacts the stationary contact 133b, and the moving contact 133g contacts the stationary contact 133h, thereby closing the first contact assembly C1 and the second contact assembly C2 simultaneously. During the closing process, the first flexible connection part 133j and the second flexible connection part 133f will undergo flexible deformation to adapt to the movement of the moving contacts they are connected to.

[0140] like Figure 15 and Figure 16As shown schematically, the switch pole P1 may also include an arc-extinguishing grid 133n, which may be arranged near the two contact assemblies to extinguish the arc when the contact assemblies actuate. The number of arc-extinguishing grids 133n can be designed as needed and is not limited to that shown in the figure.

[0141] Figure 15 and Figure 16 In the illustrated embodiment, the switching electrode is driven to operate through the meshing transmission of the drive shaft 131b with the first drive seat 133k and the second drive seat 133m. This transmission method is relatively simple and reliable, resulting in good consistency in the operation of each switching electrode, ensuring the reliability of the isolating switch 13 and meeting product requirements.

[0142] In the above embodiments, the drive shaft 131b drives the drive seat to rotate, thereby driving the switch electrode to operate. In the following embodiments, the drive shaft 131b drives the drive seat to move approximately in a straight line, thereby driving the switch electrode to operate. This will be explained below.

[0143] Figure 17 This illustration shows the planar assembly structure of the switch P1 and the drive shaft 131b in another embodiment of this application.

[0144] like Figure 17 As shown, the moving contact 133c of the first contact assembly C1 and the moving contact 133g of the second contact assembly C2 can be fixed to both sides of the transmission base 133d, respectively, with the moving contacts 133c and 133g electrically isolated. The first contact assembly C1 and the second contact assembly C2 can be approximately mirror-symmetrical, with the axis of symmetry passing through the center of the transmission shaft 131b. The stationary contacts 133b and 133h can both be located on one side of the transmission base 133d, while the first flexible connection 133j, the second flexible connection 133f, the first terminal 133i, and the second terminal 133e can all be located on the other side of the transmission base 133d.

[0145] like Figure 17 As shown, the switch P1 may further include a connecting rod 133o, which is rotatably connected to the drive shaft 131b and the drive seat 133d. The connection position of the connecting rod 133o on the drive shaft 131b may be offset from the center of the drive shaft 131b by a certain distance. Thus, the drive shaft 131b, the connecting rod 133o, and the drive seat 133d can form a linkage mechanism. When the drive shaft 131b rotates, it can push the drive seat 133d to move approximately in a straight line via the connecting rod 133o. The direction of movement of the drive seat 133d may be approximately parallel to the arrangement direction of the stationary contact 133b (or stationary contact 133h) and the first terminal 133i (or the second terminal 133e). The connecting rod 133o can rotate relative to the drive shaft 131b and the drive seat 133d.

[0146] exist Figure 17 In the indicated state, both the first contact assembly C1 and the second contact assembly C2 are in the closed state. When it is necessary to disconnect the switch pole P1, the user can rotate the drive shaft 131b, for example, by rotating the drive shaft 131b clockwise. The drive shaft 131b can push the drive seat 133d to move via the connecting rod 133o, for example, in... Figure 17 From a visual perspective, the transmission seat 133d can move downwards. It can be understood that the transmission seat 133d can move on a surface intersecting the axial direction of the transmission shaft 131b, and this surface can be approximately perpendicular to that axial direction. The transmission seat 133d can drive the moving contacts 133c and 133g to move simultaneously, causing the moving contact 133c to separate from the stationary contact 133b and the moving contact 133g to separate from the stationary contact 133h, thereby simultaneously disengaging the first contact assembly C1 and the second contact assembly C2. Figure 18 As shown. During the disconnection process, the first flexible connection portion 133j and the second flexible connection portion 133f undergo flexible deformation to adapt to the movement of the moving contacts they are connected to.

[0147] like Figure 18 As shown, after switch P1 is opened, a break point is formed between the moving contact 133c and the stationary contact 133b of the first contact assembly C1, and a break point is formed between the moving contact 133g and the stationary contact 133h of the second contact assembly C2. The single-break point design of each contact assembly results in lower contact resistance and less heat generation due to fewer contact points, and the structure of the contact assembly is relatively simple.

[0148] Combination Figure 18 and Figure 17 As easily understood, when it is necessary to close switch P1, the user can rotate the drive shaft 131b in the reverse direction. The drive shaft 131b can drive the drive seat 133d to move in the reverse direction via the connecting rod 133o. The drive seat 133d can drive the moving contact 133c and the moving contact 133g to move in the reverse direction simultaneously, so that the moving contact 133c contacts the stationary contact 133b and the moving contact 133g contacts the stationary contact 133h, thereby closing the first contact assembly C1 and the second contact assembly C2 simultaneously. During the closing process, the first flexible connecting part 133j and the second flexible connecting part 133f will undergo flexible deformation to adapt to the movement of the moving contacts they are connected to.

[0149] Figure 17 and Figure 18 The embodiment shown uses a linkage mechanism formed by the drive shaft 131b, connecting rod 133o, and drive seat 133d to drive the switching poles. This transmission method is relatively simple and reliable, resulting in good consistency in the operation of each switching pole, ensuring the reliability of the isolating switch 13 and meeting product requirements.

[0150] based on Figure 17 The embodiment shown, Figure 19 This illustration shows the planar assembly structure of the switch P1 and the drive shaft 131b in another embodiment of this application.

[0151] like Figure 19 As shown, the transmission seat in the switch pole P1 may include a first transmission seat 133k and a second transmission seat 133m, which are respectively located on both sides of the transmission shaft 131b.

[0152] like Figure 19 As shown, the linkage in switch P1 includes a first linkage 133p and a second linkage 133q. The first linkage 133p rotatably connects the drive shaft 131b and the first drive seat 133k, and the second linkage 133q rotatably connects the drive shaft 131b and the second drive seat 133m. The connection positions of the first linkage 133p and the second linkage 133q on the drive shaft 131b can be approximately located at opposite ends of the radial direction of the drive shaft 131b. Furthermore, both connection positions can be offset from the center of the drive shaft 131b by a certain distance. Therefore, the drive shaft 131b, the first linkage 133p, and the first drive seat 133k can form a linkage mechanism, and the drive shaft 131b, the second linkage 133q, and the second drive seat 133m can also form a linkage mechanism, i.e., a double linkage mechanism. When the drive shaft 131b rotates, it can push the first drive seat 133k to move approximately in a straight line via the first connecting rod 133p. The direction of movement of the first drive seat 133k is approximately perpendicular to the arrangement direction of the stationary contact 133b and the first terminal 133i. Simultaneously, the drive shaft 131b can push the second drive seat 133m to move approximately in a straight line via the second connecting rod 133q. The direction of movement of the second drive seat 133m is approximately perpendicular to the arrangement direction of the stationary contact 133h and the second terminal 133e. The first drive seat 133k and the second drive seat 133m move in opposite directions. The first connecting rod 133p can rotate relative to the drive shaft 131b and the first drive seat 133k, and the second connecting rod 133q can rotate relative to the drive shaft 131b and the second drive seat 133m.

[0153] like Figure 19 As shown, the first contact assembly C1 may not include the flexible connecting part, and the stationary contact 133b, the moving contact 133c, and the first terminal 133i can be arranged in sequence. The moving contact 133c can be fixed to the first transmission seat 133k. It is understood that... Figure 19 The example shown is that the contact above the moving contact 133c is the stationary contact 133b, and the contact below the moving contact 133c is the first terminal 133i. In reality, the contact above the moving contact 133c could also be the first terminal 133i, and the contact below the moving contact 133c could also be the stationary contact 133b.

[0154] like Figure 19 As shown, the second contact assembly C2 may not include the flexible connecting part, and the stationary contact 133h, the moving contact 133g, and the second terminal 133e can be arranged in sequence. The moving contact 133g can be fixed to the second transmission base 133m. It is understood that... Figure 19 The example shown is that the terminal above the moving contact 133g is the stationary contact 133h, and the terminal below the moving contact 133g is the second terminal 133e. In reality, the terminal above the moving contact 133g could also be the second terminal 133e, and the terminal below the moving contact 133g could also be the stationary contact 133h.

[0155] like Figure 19 As shown, the first contact assembly C1 and the second contact assembly C2 can be roughly mirror-symmetrical, and the axis of symmetry can pass through the center of the transmission shaft 131b.

[0156] exist Figure 19 In the shown state, both the first contact assembly C1 and the second contact assembly C2 are in the closed state. When it is necessary to disconnect the switch P1, the user can rotate the drive shaft 131b. The drive shaft 131b can push the first drive seat 133k to move via the first connecting rod 133p, and simultaneously push the second drive seat 133m to move via the second connecting rod 133q. For example, if the drive shaft 131b can rotate clockwise, the first drive seat 133k can move to the left, and the second drive seat 133m can move to the right. It can be understood that the movement directions of the first drive seat 133k and the second drive seat 133m are both intersecting the axial direction of the drive shaft 131b. The first transmission seat 133k can drive the moving contact 133c to move, while the second transmission seat 133m can drive the moving contact 133g to move, so that the moving contact 133c is separated from the stationary contact 133b and the first terminal 133i, and the moving contact 133g is separated from the stationary contact 133h and the second terminal 133e, thereby causing the first contact assembly C1 and the second contact assembly C2 to disconnect simultaneously. Figure 20 As shown.

[0157] like Figure 20 As shown, after switch P1 is disconnected, a break is formed between the moving contact 133c and the stationary contact 133b of the first contact assembly C1, and another break is formed between the moving contact 133c and the first terminal 133i; a break is formed between the moving contact 133g and the stationary contact 133h of the second contact assembly C2, and another break is formed between the moving contact 133g and the second terminal 133e. Therefore, each contact assembly in this embodiment can form a double break. The double break design simplifies the structure of the contact assembly because it eliminates the need for a flexible connection.

[0158] Combination Figure 20 and Figure 19As easily understood, when it is necessary to close switch P1, the user can rotate the drive shaft 131b in the reverse direction. The drive shaft 131b can push the first drive seat 133k to move in the reverse direction through the first connecting rod 133p, and simultaneously push the second drive seat 133m to move in the reverse direction through the second connecting rod 133q. For example, if the drive shaft 131b can rotate counterclockwise, the first drive seat 133k can move to the right, and the second drive seat 133m can move to the left. The first drive seat 133k can drive the moving contact 133c to move, and at the same time, the second drive seat 133m can drive the moving contact 133g to move, so that the moving contact 133c is in contact with the stationary contact 133b and the first terminal 133i, and the moving contact 133g is in contact with the stationary contact 133h and the second terminal 133e, thereby closing the first contact assembly C1 and the second contact assembly C2 simultaneously.

[0159] Figure 19 and Figure 20 The illustrated embodiment uses a double-link mechanism to drive the switching electrodes. This transmission method is relatively simple and reliable, resulting in good consistency in the operation of each switching electrode, ensuring the reliability of the isolating switch 13 and meeting product requirements.

[0160] like Figure 20 As shown, the switch P1 may further include an arc-extinguishing grid 133r, which can be arranged near the two contact assemblies to extinguish the arc when the contact assemblies operate. Schematic, two sets of arc-extinguishing grids 133r can be provided, one set corresponding to one contact assembly. The arc-extinguishing grid 133r may include a first part a, a second part c, and a third part c, arranged sequentially, forming a roughly C-shaped structure with the opening facing the contact assembly. When the switch P1 is open, the C-shaped structure approximately covers both breaks in the contact assembly, including the moving contact. Thus, the arc generated during the opening and closing of the contact assembly can be guided into the arc-extinguishing grid 133r and extinguished.

[0161] For ease of understanding, the relevant technical terms involved in the embodiments of this application will be explained and described below.

[0162] In the description of the embodiments in this application, unless otherwise stated, "multiple" means two or more.

[0163] The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Features specified as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0164] The term "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Similarly, "fixation" should also be interpreted broadly. For example, "fixation" can be direct fixation or indirect fixation through an intermediate medium.

[0165] The directional terms mentioned in the embodiments of this application, such as "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "side," "top," and "bottom," are only for reference to the directions in the accompanying drawings. These directional terms are used to better and more clearly explain and understand the embodiments of this application, and are not intended to explicitly or implicitly suggest that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, etc., and therefore should not be construed as limiting the embodiments of this application.

[0166] In the description of the embodiments in this application, unless otherwise stated, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone.

[0167] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A photovoltaic conversion system, characterized in that, The photovoltaic conversion system includes an isolation switch and a DC-DC conversion circuit; The isolating switch is used to connect the DC-DC converter circuit and the multiple photovoltaic units; the photovoltaic unit includes a photovoltaic module, a photovoltaic string formed by multiple photovoltaic modules connected in series, or a photovoltaic array formed by multiple photovoltaic modules connected in series and parallel. The disconnect switch includes multiple switching poles, each of which includes two contact assemblies that are electrically isolated from each other. Each contact assembly is used to connect the DC-DC converter circuit and at least one of the multiple photovoltaic units. Each of the contact assemblies includes a stationary contact and a moving contact, which can contact or separate to control the closing or opening of the contact assembly; all of the contact assemblies in the disconnecting switch close or open simultaneously.

2. The photovoltaic conversion system according to claim 1, characterized in that, The plurality of switching electrodes includes a first switching electrode and a second switching electrode; The two contact assemblies of the first switching electrode are respectively connected to the positive electrode of at least one of the photovoltaic units; The two contact assemblies of the second switching electrode are respectively connected to the negative electrode of at least one of the photovoltaic units.

3. The photovoltaic conversion system according to claim 2, characterized in that, The plurality of photovoltaic units includes a first photovoltaic unit and a second photovoltaic unit; The two contact assemblies of the first switch electrode are respectively connected to the positive electrode of the first photovoltaic unit and the positive electrode of the second photovoltaic unit; The two contact assemblies of the second switch electrode are respectively connected to the negative electrode of the first photovoltaic unit and the negative electrode of the second photovoltaic unit.

4. The photovoltaic conversion system according to claim 2, characterized in that, The plurality of photovoltaic units include a first photovoltaic unit, a second photovoltaic unit, and a third photovoltaic unit; The two contact assemblies of the first switch electrode are respectively connected to the positive electrode of the first photovoltaic unit and the positive electrode of the second photovoltaic unit; The two contact assemblies of the second switch electrode are respectively connected to the negative electrode of the first photovoltaic unit and the negative electrode of the third photovoltaic unit.

5. The photovoltaic conversion system according to any one of claims 1-4, characterized in that, The plurality of switching electrodes includes a third switching electrode, wherein the two contact assemblies of the third switching electrode are respectively connected to the positive and negative electrodes of the same photovoltaic unit, or the two contact assemblies of the third switching electrode are respectively connected to the positive electrode of one photovoltaic unit and the negative electrode of another photovoltaic unit.

6. The photovoltaic conversion system according to any one of claims 1-5, characterized in that, Each of the contact assemblies is connected to at least two of the photovoltaic units in parallel.

7. The photovoltaic conversion system according to any one of claims 1-6, characterized in that, The photovoltaic conversion system includes a first DC-DC conversion circuit and a second DC-DC conversion circuit; The plurality of switching poles includes a first switching pole and a second switching pole. The two contact assemblies in the first switching pole are both connected to the first DC-DC converter circuit, and the two contact assemblies in the second switching pole are both connected to the second DC-DC converter circuit.

8. The photovoltaic conversion system according to any one of claims 1-7, characterized in that, The photovoltaic conversion system also includes a DC-AC conversion circuit, and all the DC-DC conversion circuits in the photovoltaic conversion system are connected to the DC-AC conversion circuit.

9. The photovoltaic conversion system according to any one of claims 1-8, characterized in that, Each of the switch poles also includes a drive base, and the moving contacts of the two contact assemblies are fixed to the drive base; The disconnecting switch also includes a drive shaft, and the plurality of switch poles are all connected to the drive shaft and arranged sequentially along the axial direction of the drive shaft. The drive shaft is used to drive the drive seat to move. In each switch pole, the drive seat is used to simultaneously drive the moving contact of the two contact assemblies to contact or separate from the stationary contact.

10. The photovoltaic conversion system according to claim 9, characterized in that, The drive shaft is used to rotate about its axis and drive all the drive seats to rotate simultaneously.

11. The photovoltaic conversion system according to claim 9, characterized in that, Each of the switch poles also includes a connecting rod, which is rotatably connected to both the transmission base and the transmission shaft; The drive shaft is used to rotate about its axis and drive all the connecting rods to move simultaneously, so that each connecting rod pushes the drive seat to move.

12. The photovoltaic conversion system according to any one of claims 1-8, characterized in that, The disconnect switch also includes a drive shaft, and the plurality of switch poles are all connected to the drive shaft and arranged sequentially along the axial direction of the drive shaft; Each of the switch poles further includes a first transmission seat and a second transmission seat, the first transmission seat and the second transmission seat being respectively disposed on opposite sides of the transmission shaft, and the moving contacts of the two contact assemblies being respectively fixed to the first transmission seat and the second transmission seat; The drive shaft is used to drive all the first drive seats and all the second drive seats to move simultaneously, so that the first drive seat and the second drive seat in each of the switch poles respectively drive the moving contact and the stationary contact of the two contact assemblies to contact or separate.

13. The photovoltaic conversion system according to claim 12, characterized in that, The first transmission seat, the second transmission seat, and the transmission shaft are all provided with meshing teeth, and the meshing teeth of the first transmission seat and the meshing teeth of the second transmission seat mesh with the meshing teeth of the transmission shaft. The drive shaft is used to rotate about the axis of the drive shaft and drive all the first drive seats and all the second drive seats to rotate simultaneously.

14. The photovoltaic conversion system according to claim 12, characterized in that, Each of the switch poles further includes a first link and a second link, wherein the first link is rotatably connected to the drive shaft and the first drive seat, and the second link is rotatably connected to the drive shaft and the second drive seat; The drive shaft is used to rotate about the axis of the drive shaft and drive all the first and second links to move simultaneously, such that each first link pushes the first transmission seat to move and each second link pushes the second transmission seat to move, wherein the first and second transmission seats move in opposite directions.

15. The photovoltaic conversion system according to claim 14, characterized in that, Each of the two contact assemblies in each of the said switch poles includes a terminal block; In each of the switch poles, the first transmission seat is used to drive the moving contact of one of the contact assemblies to contact or separate from the stationary contact and the terminal block, and the second transmission seat is used to drive the moving contact of another contact assembly to contact or separate from the stationary contact and the terminal block. In each of the contact assemblies, when the moving contact is in contact with the stationary contact and the terminal block, the moving contact is located between the stationary contact and the terminal block.

16. The photovoltaic conversion system according to any one of claims 9-13, characterized in that, Each of the two contact assemblies in each of the switch poles includes a flexible connection portion and a terminal block; in each of the contact assemblies, the flexible connection portion connects the moving contact and the terminal block.

17. A disconnecting switch, characterized in that, The disconnecting switch includes a plurality of switch poles that are stacked sequentially and electrically isolated from each other. Each switch pole includes two contact assemblies that are electrically isolated from each other. The two contact assemblies are disposed on a surface perpendicular to the stacking direction of the plurality of switch poles. Each of the contact assemblies includes a stationary contact and a moving contact, which can contact or separate to control the closing or opening of the contact assembly; all of the contact assemblies in the disconnecting switch close or open simultaneously.

18. The disconnecting switch according to claim 17, characterized in that, Each of the switch poles also includes a drive base, and the moving contacts of the two contact assemblies are fixed to the drive base; The disconnecting switch also includes a drive shaft, and the plurality of switch poles are all connected to the drive shaft and stacked sequentially along the axial direction of the drive shaft. The drive shaft is used to drive all the drive seats to move simultaneously. In each switch pole, the drive seat is used to simultaneously drive the moving contact of the two contact assemblies to contact or separate from the stationary contact.

19. The disconnecting switch according to claim 18, characterized in that, The drive shaft is used to rotate about its axis and drive all the drive seats to rotate simultaneously.

20. The disconnecting switch according to claim 17, characterized in that, The disconnect switch also includes a drive shaft, and the plurality of switch poles are all connected to the drive shaft and stacked sequentially along the axial direction of the drive shaft; Each of the switch poles further includes a first transmission seat and a second transmission seat, the first transmission seat and the second transmission seat being respectively disposed on opposite sides of the transmission shaft, and the moving contacts of the two contact assemblies being respectively fixed to the first transmission seat and the second transmission seat; The drive shaft is used to drive all the first drive seats and all the second drive seats to move simultaneously, so that the first drive seat and the second drive seat in each of the switch poles respectively drive the moving contact and the stationary contact of the two contact assemblies to contact or separate.

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