Power converter and isolating switch

Abstract

The invention discloses a power converter and an isolating switch. In the disconnecting switch, the first division layer of the first switch group and the second division layer of the second switch group are stacked in the first direction, and the first division layer and the second division layer are arranged in the second direction, so that on one hand, the first switch group and the second switch group are distributed in a scattered manner, and the first division layer and the second division layer are distributed; the isolation switch is not limited by the size of the power converter in a certain direction, the situation that the size of the isolation switch in one direction needs to extend outwards along the size of the direction is avoided, and the miniaturization design of the power converter is facilitated. On the basis that a large number of first separation layers and second separation layers are arranged, the transmission part can simultaneously drive the first transmission shaft and the second transmission shaft to rotate, so that the first separation layer of the first switch group and the second separation layer of the second switch group can be simultaneously opened or closed; therefore, the switching-on and switching-off of the first separating layer and the second separating layer can realize better synchronism.

Description

Technical Field

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

[0002] With the advent of electricity, switching devices play a crucial role in many production processes and technical equipment. In power systems, switching devices are used for the distribution, control, and protection of electrical energy. Disconnect switches are a commonly used switching device in circuits. In the photovoltaic power generation field, these switches are typically used in power converters and consist of a drive mechanism, multi-pole splitting layers, and remote tripping devices. Currently, the multi-pole splitting layers of disconnect switches (such as positive and negative pole splitting layers) are stacked along the direction perpendicular to the terminal block. When a large number of splitting layers are required, the dimensions of the disconnect switch along the stacking direction of the multi-pole splitting layers increase with the layout of the splitting layers. Furthermore, the thickness dimension of the disconnect switch is easily limited by the size of the power converter, which is unfavorable for the placement of the disconnect switch within the power converter. Increasing the number of splitting layers also affects the synchronicity of the opening or closing of each splitting layer. Therefore, the size of the power converter and the synchronicity of the opening and closing of each splitting layer limit the size design of the disconnect switch. Summary of the Invention

[0003] This application provides a power converter and a disconnecting switch, which disperses the positive and negative terminals of the DC terminals in separate layers, reduces the size of the DC switch in one direction, facilitates the layout of the disconnecting switch within the power converter, and improves the synchronization of opening and closing of each layer by driving the first and second drive shafts to rotate simultaneously through a transmission component.

[0004] In a first aspect, this application provides a power converter, which includes a power conversion circuit, a positive input terminal, a negative input terminal, an isolating switch, and a terminal block. Both the positive and negative input terminals are mounted on a circuit board and are used to connect to the positive and negative terminals of a photovoltaic string, respectively. The power conversion circuit converts direct current (DC) from the photovoltaic string into alternating current (AC) and transmits the AC power to the power grid or a load. Both the positive and negative input terminals are connected to the power conversion circuit via the isolating switch.

[0005] The disconnect switch includes an operating mechanism, a first switch group, a second switch group, and a transmission assembly. The first switch group includes at least one first disconnect layer stacked along a first direction, and the second switch group includes at least one second disconnect layer stacked along the first direction. The first disconnect layer of the first switch group is connected to the positive input terminal, and the second disconnect layer of the second switch group is connected to the negative input terminal. The first and second disconnect layers are distributed opposite to each other along a second direction, which is perpendicular to the surface of the terminal block. The first and second directions are mutually perpendicular. The transmission assembly includes a transmission member, a first transmission shaft, and a second transmission shaft. The operating mechanism is driven by the transmission member, which is also driven by the first and second transmission shafts. The transmission member moves under the drive of the operating mechanism to rotate the first and second transmission shafts. The first transmission shaft is connected to the first switch group and is used to open or close the first disconnect layer of the first switch group. The second transmission shaft is connected to the second switch group and is used to open or close the second disconnect layer of the second switch group.

[0006] In the prior art, the positive and negative pole separation layers of the disconnecting switch are usually stacked along one direction. For example, the positive and negative pole separation layers are stacked along the thickness direction of the disconnecting switch. When a large number of separation layers need to be laid out, the size of the disconnecting switch along the thickness direction also increases with the layout of the separation layers. Moreover, the size of the disconnecting switch in the thickness direction is easily limited by the size of the power converter, which is not conducive to the layout of the disconnecting switch in the power converter.

[0007] In this application, the first split layer of the first switch group and the second split layer of the second switch group are stacked along the first direction, and the first and second split layers are arranged along the second direction. That is, the first switch group and the second switch group are arranged along the second direction. On the one hand, this achieves a distributed layout of the first and second switch groups. Compared with the first and second switch groups, as well as the first and second split layers, being stacked along the same direction, the layout of the first and second split layers in this application is not limited by the size of the power converter in a certain direction. This avoids the need to extend the power converter outward along that direction due to the excessive size of the isolating switch in one direction, thus increasing the overall volume of the power converter and facilitating the miniaturization design of the power converter. Furthermore, the first split layer is connected to the positive electrode of the photovoltaic string, i.e., the first split layer is the positive electrode split layer, and the second split layer is connected to the negative electrode of the photovoltaic string, i.e., the second split layer is the negative electrode split layer. The distributed layout of the first and second split layers achieves a separate design of the positive and negative electrode split layers, strengthens the insulation between the first and second split layers, and improves the safety of the isolating switch. On the other hand, the dispersed layout of the first and second split layers can shorten the cables connecting the positive input terminal and the power conversion circuit in the first split layer, and the cables connecting the negative input terminal and the power conversion circuit in the second split layer, thereby reducing the space occupied by the connecting cables in the power converter and thus facilitating a compact layout inside the power converter.

[0008] Based on the extensive layout of the first and second split layers, by connecting both the first and second drive shafts to the transmission components, when the operating mechanism drives the transmission components to move, the transmission components can simultaneously drive the first and second drive shafts to rotate, so that the first split layer of the first switch group and the second split layer of the second switch group can be opened or closed at the same time, thus achieving better synchronization between the opening and closing of the first and second split layers.

[0009] In one possible implementation, there are multiple first switch groups and multiple second switch groups, with multiple first switch groups arranged along a third direction and multiple second switch groups arranged along a third direction, wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0010] All first disconnect layers of the disconnecting switch are grouped, and all second disconnect layers are grouped. Multiple first switch groups and multiple second switch groups are arranged along a third direction, which is different from the arrangement direction of the first and second disconnect layers, and also different from the stacking direction of at least one first disconnect layer in a first switch group (or at least one second disconnect layer in a second switch group), so that multiple first switch groups and multiple second switch groups are arranged in a flat manner in the power converter.

[0011] In one possible implementation, the transmission member includes a first rack portion and a second rack portion extending in a third direction. The transmission assembly also includes a first gear and a second gear. The first gear coincides with the axis of the first transmission shaft and is fixed to the first transmission shaft, and meshes with the first rack portion. The second gear coincides with the axis of the second transmission shaft and is fixed to the second transmission shaft, and meshes with the second rack portion.

[0012] By providing a first rack extending along a third direction on the transmission component, there is no need to add other gears or shafts to connect the first gear, which helps to reduce the size of the disconnect switch. The first transmission shaft is fixed in a position in the third direction, and the first gear coincides with the axis of the first transmission shaft. When the first gear meshes with the first rack extending along the third direction and rotates, the transmission component moves along the third direction under the drive of the operating mechanism to drive the first gear to rotate, converting translation into rotation. Thus, the power is transmitted to the first transmission shaft through the rotating first gear, realizing the rotation of the first transmission shaft.

[0013] By incorporating a second rack extending along a third direction on the transmission component, there is no need to add other gears or shafts to connect the second gear, which helps to reduce the size of the disconnect switch. The second transmission shaft is fixed in a position along the third direction, and the second gear coincides with the axis of the second transmission shaft. When the second gear meshes with the second rack extending along the third direction and rotates, the transmission component moves along the third direction under the drive of the operating mechanism to drive the second gear to rotate, converting translation into rotation. Thus, the power is transmitted to the second transmission shaft through the rotating second gear, realizing the rotation of the second transmission shaft.

[0014] In one possible implementation, a first gear is used to drive a first moving contact of a first disconnecting layer of a first switching group to rotate via a first drive shaft, thereby opening or closing the first disconnecting layer of the first switching group. A second gear is used to drive a second moving contact of a second disconnecting layer of a second switching group to rotate via a second drive shaft, thereby opening or closing the second disconnecting layer of the second switching group.

[0015] In a first switch group, a first drive shaft rotates under the drive of a first gear, thereby causing the first moving contacts of all first disconnecting layers to rotate, resulting in the opening or closing of all first disconnecting layers in the first switch group. In a second switch group, a second drive shaft rotates under the drive of a second gear, thereby causing the second moving contacts of all second disconnecting layers to rotate, resulting in the opening or closing of all second disconnecting layers in the second switch group.

[0016] In one possible implementation, the current carrying capacity of the first fault layer is greater than that of the second fault layer, the number of first fault layers in the first switch group is less than the number of second fault layers in the second switch group, and the number of positive electrodes of the photovoltaic string connected to the first switch group is equal to the number of negative electrodes of the photovoltaic string connected to the second switch group.

[0017] This configuration allows the first switch group and the corresponding second switch group to form a closed loop. Furthermore, setting the number of the first segmentation layer to be less than the number of the second segmentation layer can reduce the space occupied by the first segmentation layer along the first direction, which is beneficial for the miniaturization design of the disconnecting switch.

[0018] In one possible implementation, the current carrying capacity of the second fault layer is greater than that of the first fault layer, the number of first fault layers in the first switch group is greater than the number of second fault layers in the second switch group, and the number of positive electrodes of the photovoltaic string connected to the first switch group is equal to the number of negative electrodes of the photovoltaic string connected to the second switch group.

[0019] This configuration allows the first switch group and the corresponding second switch group to form a closed loop. Furthermore, setting the number of second break layers to be less than the number of first break layers can reduce the space occupied by the second break layers along the first direction, which is beneficial for the miniaturization design of the disconnecting switch.

[0020] In one possible implementation, the disconnect switch is mounted on a terminal block, with a first disconnect layer having a first pin connected to a positive input terminal via the terminal block. A second disconnect layer has a second pin connected to a negative input terminal via the terminal block.

[0021] With both positive and negative input terminals mounted on the board, the first and second disconnect layers are also mounted on the board. The connection between the positive input terminal and the first disconnect layer, and the connection between the negative input terminal and the second disconnect layer, are all completed through conductors inside the terminal block, saving on connecting cables and improving assembly efficiency. Furthermore, the large number of positive and negative input terminals allows for maintaining appropriate installation distances between each terminal, and keeps the first and second disconnect layers within their original size, thus facilitating the miniaturization of the disconnect switch design. Both the positive and negative input terminals are connected to the input side of the disconnect switch via the terminal block, ensuring the reliability of the connection between both terminals and the disconnect switch.

[0022] In one possible implementation, the transmission assembly further includes an output shaft and a transmission wheel, the operating mechanism is connected to the output shaft, the output shaft is connected to the transmission wheel, the output shaft is arranged perpendicularly to the transmission component, and the transmission wheel is connected to the transmission component.

[0023] The output shaft and transmission component are connected at a 90° angle via a transmission wheel, enabling simple and reliable 90° rotation operation between them. Furthermore, the perpendicular alignment of the output shaft and transmission component allows for a more compact layout of the operating mechanism and transmission components, thus reducing the size of the disconnect switch.

[0024] Secondly, this application provides a disconnecting switch, comprising an operating mechanism, a first switch group, a second switch group, and a transmission assembly. The first switch group includes at least one first split layer stacked along a first direction, and the second switch group includes at least one second split layer stacked along the first direction. The first split layer of the first switch group is connected to the positive terminal of a photovoltaic string, and the second split layer of the second switch group is connected to the negative terminal of the photovoltaic string. The first and second split layers are distributed opposite to each other along a second direction, and the first and second directions are perpendicular to each other. The transmission assembly includes a transmission member, a first transmission shaft, and a second transmission shaft. The operating mechanism is driven by the transmission member, and the transmission member is driven by the first and second transmission shafts. The transmission member is used to move under the drive of the operating mechanism to drive the first and second transmission shafts to rotate. The first transmission shaft is connected to the first switch group and is used to open or close the first split layer of the first switch group. The second transmission shaft is connected to the second switch group and is used to open or close the second split layer of the second switch group. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0026] Figure 1 This is a schematic diagram of a photovoltaic power supply system provided in one embodiment of this application;

[0027] Figure 2 This is a simplified structural diagram of a power converter provided in one embodiment of this application;

[0028] Figure 3 This is a partial structural schematic diagram of a power converter from one perspective, provided in an embodiment of this application.

[0029] Figure 4 This is a partially exploded view of the disconnector provided in an embodiment of this application;

[0030] Figure 5 This is a schematic diagram of another disconnecting switch provided in an embodiment of this application;

[0031] Figure 6 This is a schematic diagram of the structure of another disconnecting switch provided in an embodiment of this application;

[0032] Figure 7 A top view of a disconnecting switch provided in an embodiment of this application;

[0033] Figure 8 This is a schematic diagram of the structure of a disconnecting switch provided in an embodiment of this application;

[0034] Figure 9 for Figure 3 An enlarged view of point IX in the power converter shown;

[0035] Figure 10 A partial structural schematic diagram of a power converter from another perspective provided in an embodiment of this application;

[0036] Figure 11 This is a schematic diagram of the exploded structure of the first segmentation layer provided in an embodiment of this application;

[0037] Figure 12 for Figure 10 An enlarged view of point XII in the power converter shown;

[0038] Figure 13 This is a schematic diagram of the exploded structure of the second segmentation layer provided in an embodiment of this application;

[0039] Figure 14 This is a schematic diagram of the structure of a disconnecting switch and a terminal block provided in an embodiment of this application;

[0040] Figure 15 An exploded view of the first segment, the first mounting base, and the first gear provided in an embodiment of this application;

[0041] Figure 16 This is an exploded view of the second segment, the second mounting base, and the second gear provided in an embodiment of this application.

[0042] Explanation of reference numerals in the attached figures:

[0043] Z - First direction; Y - Second direction; X - Third direction; 10 - Handle; 20 - First switch group; 21 - First segment; 211 - First pin; 2111 - First segment; 2112 - Second segment; 212 - First housing; 213 - Third pin; 214 - First moving contact; 215 - First base; 216 - First top cover; 22 - First mounting base; 221 - Opening; 30 - Second switch group; 31 - Second segment; 3111 - Second pin; 3111 - Third segment; 3112 - Fourth segment; 312 - Second housing; 313 - Fourth pin; 314 - Second moving contact; 315 - Second base; 316 - Second Top cover; 32-Second mounting base; 321-Perforation; 40-Operating mechanism; 50-Transmission assembly; 51-Transmission component; 511-First rack section; 512-Second rack section; 513-Third rack section; 514-First part; 515-Second part; 52-First drive shaft; 53-Second drive shaft; 54-First gear; 55-Second gear; 56-Output shaft; 57-Transmission wheel; 100-Isolating switch; 200-DC terminal; 201-Positive input terminal; 202-Negative input terminal; 300-Controller; 400-Housing; 500-Connecting board; 1000-Power converter; 2000-Photovoltaic string. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0045] This application provides a power converter applied in a power generation system. The power converter is connected to an external DC source, converting the DC power from the external DC source into AC power, and then transmitting the AC power to the power grid or a load. The power converter can be a photovoltaic inverter or an energy storage converter. The external DC source includes photovoltaic strings and energy storage batteries.

[0046] Please see Figure 1 , Figure 1This is a schematic diagram of a photovoltaic power supply system according to an embodiment of this application. The photovoltaic power supply system includes a power converter 1000 and a photovoltaic string 2000. The power converter 1000 is a photovoltaic inverter, and its power conversion circuit is used to convert the direct current from the photovoltaic string 2000 into alternating current and transmit the alternating current to the grid or a load (not shown). Specifically, the power converter 1000 includes an isolating switch 100, multiple DC terminals, a direct current / direct current (DC / DC) circuit, DC buses BUS+ and BUS-, a direct current / alternating current (DC / AC) circuit, a grid-connected switch, and a controller 300. The DC / DC circuit and the DC / AC circuit can be collectively referred to as the power conversion circuit. The isolating switch 100 is used to connect the photovoltaic string 2000 and the power conversion circuit. In practical applications, the photovoltaic string 2000 is connected to the DC terminal, which then transmits DC power to the DC / DC circuit through the isolating switch 100. The DC / DC circuit then transforms the DC power and transmits it to the DC / AC circuit through the DC bus. Subsequently, the DC / AC circuit converts the DC power into AC power and transmits it to the grid or load through the grid-connected switch. Further, the disconnector 100 includes a first switch group 20, a second switch group 30, and a trip unit. The first switch group 20 includes a positive disconnect layer, and the second switch group 30 includes a negative disconnect layer. One end of the positive disconnect layer is used to connect to the positive terminal of one or more parallel photovoltaic strings 2000, and one end of the negative disconnect layer is connected to the negative terminal of one or more parallel photovoltaic strings 2000. For example, the DC terminal includes a positive input terminal and a negative input terminal. One end of the positive disconnect layer is connected to the positive terminal of one or more parallel photovoltaic strings 2000 through the positive input terminal, and one end of the negative disconnect layer is connected to the negative terminal of one or more parallel photovoltaic strings 2000 through the negative input terminal. Both the positive and negative input terminals are connected to the power conversion circuit through the disconnector. Specifically, the other end of both the positive and negative disconnect layers is used to connect to the DC / DC circuit. One photovoltaic string 2000 includes multiple photovoltaic modules connected in series. The trip unit is used to receive the trip signal from the controller 300, and then promptly trip the isolating switch 100 to eliminate the fault when the current flowing through the first switch group 20 and the second switch group 30 is abnormal.

[0047] For example, when the current flowing through the first switch group 20 and the second switch group 30 in the disconnector 100 exceeds a set threshold, or when the current flowing through the first switch group 20 and the second switch group 30 in the disconnector 100 is a reverse current, the controller 300 sends a trip signal to the trip unit, thereby causing the trip unit to release the corresponding linkage structure in a timely manner, realizing the reliable disconnection of the first switch group 20 and the second switch group 30. In practical applications, since the first switch group 20 and the second switch group 30 are linked, the first switch group 20 and the second switch group 30 are generally closed or opened simultaneously. It is worth mentioning that when the photovoltaic power supply system is working normally, the current between the photovoltaic string 2000 and the power converter 1000 is a forward current, and the direction of the forward current is from the photovoltaic string 2000 to the DC / DC circuit. When the photovoltaic string 2000 is reverse-connected or a short-circuit fault occurs in the photovoltaic string 2000, the photovoltaic power supply system will have a reverse current. The direction of the reverse current is from the DC / DC circuit to the photovoltaic string 2000, or, due to the reverse-connected or short-circuited photovoltaic string 2000, other photovoltaic strings 2000 connected in parallel will flow to the reverse-connected or short-circuited photovoltaic string 2000. When the positive and negative input terminals of the photovoltaic string 2000 are connected, and the negative and positive input terminals of the photovoltaic string 2000 are connected, i.e. when the photovoltaic string 2000 is reverse-connected, or when one photovoltaic string 2000 is short-circuited, the equivalent impedance of either of the two photovoltaic strings 2000 will be much lower than the equivalent impedance of the power converter 1000. Therefore, the current of other photovoltaic strings 2000 connected in parallel with the two photovoltaic strings 2000 will be directly injected into the two photovoltaic strings 2000. At this time, the current on the first switch group 20 and the second switch group 30 connected to either of the two photovoltaic strings 2000 is the reverse current.

[0048] It should be noted that the power converter 1000 can also be an energy storage converter. Unlike the photovoltaic inverter, the DC terminal of the energy storage converter can be connected not only to the photovoltaic string 2000 but also to the energy storage battery. Therefore, the energy storage converter can not only convert DC power from the photovoltaic string 2000 or the energy storage battery into AC power, but also rectify AC power from the grid into DC power to charge the energy storage, thereby improving the energy utilization efficiency of the power supply system.

[0049] Please see Figure 2 , Figure 2This is a simplified structural diagram of a power converter 1000 provided in one embodiment of this application. In one embodiment of this application, the terminal block 500 of the power converter 1000 is housed within a housing space enclosed by a housing 400. The positive input terminal 201, the negative input terminal 202, and the disconnect switch 100 are all fixed to the terminal block 500 and partially housed within the housing 400. One end of the positive input terminal 201 and one end of the negative input terminal 202 are located outside the housing 400, while the other ends of the positive and negative input terminals and the other end of the negative input terminal 202 are located inside the housing 400 and are all connected and fixed to the terminal block 500. Mounting both the positive input terminal 201 and the negative input terminal 202 on the terminal block 500 saves on the cable from the DC terminal 200 to the terminal block 500, which is beneficial for improving assembly efficiency and connection reliability.

[0050] In some other embodiments, the positive input terminal 201 and the negative input terminal 202 can also be connected to the disconnect switch via cables.

[0051] The power converter also includes a circuit board with a power conversion circuit, and the DC terminals are electrically connected to the power conversion circuit through an isolating switch 100.

[0052] The disconnect switch 100 includes a handle 10, a first switch group, a second switch group, an operating mechanism 40, and a transmission assembly. The handle 10 protrudes from the housing 400, while the first switch group, the second switch group, the operating mechanism 40, and the transmission assembly are all located within the housing 400. In practical applications, the user can rotate the handle 10 to actuate the linkage mechanism included in the operating mechanism 40. The operating mechanism 40 then drives the transmission assembly, thereby closing or opening the first and second switch groups. It should be noted that... Figure 2 The positions of the handle 10 and the operating mechanism 40 shown are for illustrative purposes only. In some cases, they can also be placed on the side wall of the housing on the same side as the positive input terminal 201 and the negative input terminal 202.

[0053] Please see Figure 3 , Figure 3This is a partial structural schematic diagram of a power converter 1000 provided from one perspective according to an embodiment of this application. A first switch group 20 includes at least one first split layer 21 stacked along a first direction Z, and the first split layer 21 of the first switch group 20 is connected to the positive input terminal 201. A second switch group 30 includes at least one second split layer 31 stacked along the first direction Z, and the second split layer 31 of the second switch group 30 is connected to the negative input terminal 202. The first split layer 21 and the second split layer 31 are distributed opposite to each other along a second direction Y. The first direction Z is perpendicular to the surface of the terminal block 500, and the first direction Z and the second direction Y are perpendicular to each other. The surface of the terminal block 500 is the surface on which the positive input terminal 201 and the negative input terminal 202 are located.

[0054] In the prior art, the positive and negative pole separation layers of the disconnecting switch are usually stacked along one direction. For example, the positive and negative pole separation layers are stacked along the thickness direction of the disconnecting switch. When a large number of separation layers need to be laid out, the size of the disconnecting switch along the thickness direction also increases with the layout of the separation layers. Moreover, the size of the disconnecting switch in the thickness direction is easily limited by the size of the power converter, which is not conducive to the layout of the disconnecting switch in the power converter.

[0055] In this application, the first partition layer 21 of the first switch group 20 and the second partition layer 31 of the second switch group 30 are both stacked along the first direction Z, and the first partition layer 21 and the second partition layer 31 are arranged along the second direction Y. That is, the first switch group 20 and the second switch group 30 are arranged along the second direction Y. On the one hand, this achieves a distributed layout of the first switch group 20 and the second switch group 30. Compared with the first switch group 20 and the second switch group 30, as well as the first partition layer 21 and the second partition layer 31, all being stacked along the same direction, the layout of the first partition layer 21 and the second partition layer 31 in this application is not limited by the size of the power converter 1000 in a certain direction. This design avoids the need to extend the power converter 1000 outwards in one direction due to the excessive size of the disconnect switch 100 in that direction, thus increasing the overall size of the power converter 1000 and facilitating its miniaturization. Furthermore, the first split layer 21 connects to the positive terminal of the photovoltaic string, i.e., the first split layer 21 is the positive terminal split layer, and the second split layer 31 connects to the negative terminal of the photovoltaic string, i.e., the second split layer 31 is the negative terminal split layer. The dispersed layout of the first split layer 21 and the second split layer 31 achieves a separate design for the positive and negative terminal split layers, strengthens the insulation between the first split layer 21 and the second split layer 31, and improves the safety of the disconnect switch 100. On the other hand, the dispersed layout of the first split layer 21 and the second split layer 31 can shorten the cable connecting the first split layer 21 to the positive input terminal 201 and the power conversion circuit, and the cable connecting the second split layer 31 to the negative input terminal 202 and the power conversion circuit, thereby reducing the space occupied by the connecting cables in the power converter 1000, which is conducive to achieving a compact layout inside the power converter 1000.

[0056] Please refer to the following: Figure 4 , Figure 4 This is a partially exploded structural diagram of an isolating switch 100 provided in an embodiment of this application. The transmission assembly 50 includes a transmission member 51, a first transmission shaft 52, and a second transmission shaft 53. An operating mechanism 40 is driven by the transmission member 51, which is also driven by the first and second transmission shafts 52 and 53. The transmission member 51 moves under the influence of the operating mechanism 40 to rotate the first and second transmission shafts 52 and 53. The first transmission shaft 52 is connected to a first switch group 20 and is used to open or close the first disconnection layer 21 of the first switch group 20. The second transmission shaft 53 is connected to a second switch group 30 and is used to open or close the second disconnection layer 31 in the second switch group 30.

[0057] Based on the extensive layout of the first split layer 21 and the second split layer 31, by connecting the first drive shaft 52 and the second drive shaft 53 to the transmission component 51, when the operating mechanism 40 drives the transmission component 51 to move, the transmission component 51 can simultaneously drive the first drive shaft 52 and the second drive shaft 53 to rotate, so that the first split layer 21 of the first switch group 20 and the second split layer 31 of the second switch group 30 can be opened or closed at the same time, so that the opening and closing of the first split layer 21 and the second split layer 31 can achieve better synchronization.

[0058] like Figure 3 As shown, in one embodiment, there are multiple first switch groups 20 and multiple second switch groups 30. The multiple first switch groups 20 are arranged along a third direction X, and the multiple second switch groups 30 are arranged along a third direction X, wherein the first direction Z, the second direction Y, and the third direction X are perpendicular to each other. The multiple first switch groups 20 and the multiple second switch groups 30 are arranged at intervals along the third direction X to enhance the insulation performance between adjacent first switch groups 20 and adjacent second switch groups 30, thereby improving the safety of the disconnector switch 100. In this embodiment, all first split layers 21 of the disconnecting switch 100 are grouped and all second split layers 31 are grouped to form multiple first switch groups 20 and multiple second switch groups 30. The multiple first switch groups 20 and multiple second switch groups 30 are arranged along a third direction X, which is different from the arrangement direction of the first split layers 21 and the second split layers 31, and also different from the stacking direction of at least one first split layer 21 in the same first switch group 20 (or at least one second split layer 31 in the second switch group 30), so that the multiple first switch groups 20 and multiple second switch groups 30 are arranged in a flat manner in the power converter 1000.

[0059] In this embodiment, the third direction X can be the direction of movement of the transmission member 51. Under the drive of the operating mechanism 40, the transmission member 51 moves along the third direction X to drive the first transmission shaft 52 and the second transmission shaft 53 to rotate, thereby converting translation into rotation, and thus opening or closing the first split layer 21 and the second split layer 31. Along the first direction Z, the orthographic projection of the first split layer 21 on the terminal block 500 and the orthographic projection of the second split layer 31 on the terminal block 500 both overlap with the orthographic projection of the transmission member 51 in the terminal block 500. For example, the first split layer 21 and the second split layer 31 are distributed along the second direction Y. At least a portion of the first split layer 21 is located on one side of the transmission member 51 along the second direction Y, and at least a portion of the second split layer 31 is located on the other side of the transmission member 51 along the second direction Y. This is beneficial to reducing the overall volume of the disconnect switch 100 and realizing the miniaturization design of the disconnect switch 100. In addition, based on the stacking of all first split layers 21 along the first direction Z in the first switch group 20 and all second split layers 31 along the first direction Z in the second switch group 30, the first split layers 21 and the second split layers 31 are separated in the second direction Y, so that the first split layers 21 and the second split layers 31 are further apart, increasing the creepage distance between the first split layers 21 and the second split layers 31, thereby strengthening the insulation capacity between the first split layers 21 and the second split layers 31 and improving the safety performance of the disconnect switch 100.

[0060] Please see Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of another disconnecting switch 100 provided in an embodiment of this application. Figure 6 This is a schematic diagram of the structure of another disconnecting switch 100 provided in one embodiment of this application. In another embodiment, there are multiple first switch groups 20 and multiple second switch groups 30, with the multiple first switch groups 20 arranged along the second direction Y, and the multiple second switch groups 30 arranged along the second direction Y. Figure 5 As shown, the first switch group 20 and the second switch group 30 can be arranged in a row along the second direction Y. For example, at least one second switch group 30 is arranged between two adjacent first switch groups 20. Alternatively, multiple first switch groups 20 can be arranged sequentially along the second direction Y, and multiple second switch groups 30 can be arranged sequentially on one side of multiple first switch groups 20 along the second direction Y. Or, as... Figure 6 As shown, the first switch group 20 and the second switch group 30 are arranged in two columns along the second direction Y. One column is located on one side of the transmission member 51 along the third direction X, and the other column is located on the other side of the transmission member 51 along the third direction X. The arrangement of the first switch group 20 and the second switch group 30 in each column is the same as the aforementioned form of forming a column, and will not be described again.

[0061] In this embodiment, the second direction Y is the direction of movement of the transmission member 51. Under the drive of the operating mechanism 40, the transmission member 51 moves along the second direction Y to drive the first transmission shaft 52 and the second transmission shaft 53 to rotate, thereby converting translation into rotation, and thus opening or closing the first split layer 21 and the second split layer 31. In addition, along the first direction Z, the orthographic projection of the first split layer 21 on the terminal block 500 and the orthographic projection of the second split layer 31 on the terminal block 500 overlap with the orthographic projection of the transmission member 51 in the terminal block 500, which helps to reduce the overall volume of the disconnect switch 100 and realize the miniaturization design of the disconnect switch 100.

[0062] This application describes the disconnector switch 100 in detail using the example that multiple first switch groups 20 and multiple second switch groups 30 are arranged along the third direction X, and the transmission component 51 is arranged along the third direction X.

[0063] like Figure 3 and Figure 4 As shown, the orthographic projection of the first segment 21 onto a plane perpendicular to the second direction Y overlaps with the orthographic projection of the second segment 31 onto a plane perpendicular to the second direction Y. For example, while the first segment 21 and the second segment 31 are arranged along the second direction Y, they are also staggered in the first direction Z. Figure 3 and Figure 4 As shown. For example, such as... Figure 7 As shown, Figure 7 This is a top view of a disconnector switch 100 provided in an embodiment of this application. The first dividing layer 21 and the second dividing layer 31 are arranged opposite each other in the second direction Y. When a large number of first switch groups 20 and second switch groups 30 are arranged, the first switch groups 20 and second switch groups 30 are arranged more compactly, which is beneficial to realizing the miniaturization design of the disconnector switch 100.

[0064] Please see Figure 8 , Figure 8 This is a schematic diagram of the structure of an isolating switch 100 provided in one embodiment of this application. In one embodiment, the current carrying capacity of the first interrupting layer 21 is greater than that of the second interrupting layer 31, that is, the number of positive electrodes of the photovoltaic string connected to one first interrupting layer 21 is greater than the number of negative electrodes of the photovoltaic string connected to one second interrupting layer 31, the number of first interrupting layers 21 in the first switch group 20 is less than the number of second interrupting layers 31 in the second switch group 30, wherein the number of photovoltaic strings connected to the first switch group 20 is equal to the number of photovoltaic strings connected to the second switch group 30.

[0065] In one embodiment of this application, a first switch group 20 corresponds to a second switch group 30, and the two can be connected to a maximum power point tracking (MPPT) circuit (a type of DC / DC circuit). The number of positive terminals of the photovoltaic strings connected to all first interruption layers 21 in a first switch group 20 is equal to the number of negative terminals of the photovoltaic strings connected to all second interruption layers 31 in a second switch group 30, so that a pair of first switch groups 20 and their corresponding second switch groups 30 can form a closed loop with their corresponding MPPT circuit, such as... Figure 8 As shown, the number of first disconnect layers 21 in a first switch group 20 is one, and the number of second disconnect layers 31 in a second switch group 30 is three. In this case, the first disconnect layer 21 can connect six photovoltaic strings, and each second disconnect layer 31 in the second switch group 30 connects two photovoltaic strings. Setting the number of first disconnect layers 21 to be less than the number of second disconnect layers 31 reduces the space occupied by the first disconnect layer 21 along the first direction Z, which is beneficial to the miniaturization design of the disconnect switch 100.

[0066] In one embodiment, the current carrying capacity of the second split layer 31 is greater than that of the first split layer 21. That is, the number of negative electrodes of a photovoltaic string connected by a second split layer 31 is greater than the number of positive electrodes of a photovoltaic string connected by a first split layer 21, and the number of first split layers 21 in a first switch group 20 is greater than the number of second split layers 31 in a second switch group 30. In this design, the number of positive terminals of the photovoltaic strings connected to the first switch group 20 is equal to the number of negative terminals of the photovoltaic strings connected to the second switch group 30. Specifically, the number of positive terminals of all photovoltaic strings connected to the first split layer 21 in a first switch group 20 is equal to the number of negative terminals of all photovoltaic strings connected to the second split layer 31 in a second switch group 30. This allows the first switch group 20 and the corresponding second switch group 30 to form a closed loop. For example, a first switch group 20 may have two first split layers 21, each connecting the positive terminals of two photovoltaic strings. A second switch group 30 may have one second split layer 31, connecting the negative terminals of four photovoltaic strings. Setting the number of second split layers 31 to be less than the number of first split layers 21 reduces the space occupied by the second split layers 31 along the first direction Z, which is beneficial for the miniaturization design of the isolating switch 100.

[0067] In other embodiments, the number of first split layers 21 in a first switch group 20 can be equal to the number of second split layers 31 in a second switch group 30. In this case, the number of positive electrodes of a photovoltaic string connected by a single first split layer 21 is equal to the number of negative electrodes of a photovoltaic string connected by a single second split layer 31.

[0068] Please see Figure 9 and Figure 10 , Figure 9 for Figure 3 An enlarged view of point IX in the power converter 1000 shown. Figure 10 This is a partial structural schematic diagram of a power converter 1000 from another perspective, provided in an embodiment of this application. The first split layer 21 has a first pin 211, which is fixedly connected to a terminal block 500 and connected to the positive input terminal 201 via the terminal block 500. The second split layer 31 has a second pin 311, which is fixedly connected to the terminal block 500 and connected to the negative input terminal 202 via the terminal block 500.

[0069] In this application, based on the mounting of both the positive input terminal 201 and the negative input terminal 202 on the board, the first split layer 21 and the second split layer 31 are also mounted on the board. The connection between the positive input terminal 201 and the first split layer 21, and the connection between the negative input terminal 202 and the second split layer 31, are all completed through conductors inside the terminal block 500. This saves on connecting cables, improves assembly efficiency, and allows for a suitable installation distance between multiple DC terminals 200 when a large number of DC terminals 200 are laid out. Furthermore, the first split layer 21 and the second split layer 31 can be kept within their original size, thus facilitating the miniaturization of the disconnector switch 100. Both the positive input terminal 201 and the negative input terminal 202 are connected to the input side of the disconnector switch 100 through the terminal block 500, ensuring the reliability of their connection to the disconnector switch 100.

[0070] In this embodiment, the first partition layer 21 and the second partition layer 31 are arranged along the second direction Y, so that the metal traces connecting the first partition layer 21 and the second partition layer 31 on the terminal block 500 are relatively dispersed. This allows for the partitioned layout of the internal circuitry of the terminal block 500, facilitating the extension of the first pin 211 of the first partition layer 21 to the surface of the terminal block 500 for electrical connection, and facilitating the extension of the second pin 311 of the second partition layer 31 to the surface of the terminal block 500 for electrical connection, thus ensuring the reliability of the connection between the input terminal of the disconnect switch 100 and the terminal block 500.

[0071] The first pin 211 includes a first segment 2111 and a second segment 2112. The first segment 2111 is bent relative to the second segment 2112 towards the terminal block 500, and the first segment 2111 is connected to the terminal block 500. The first segment 2111 can be directly fixed to the terminal block 500 by screws or welding. The layout of the first pin 211 on the terminal block 500 and the layout of the positive input terminal 201 on the terminal block 500 can be flexibly adjusted. The maintainability of the positive input terminal 201 and the first pin 211 is better. Compared with the direct connection between the first pin 211 and the positive input terminal 201, the mechanical stress between the first pin 211 and the positive input terminal 201 is reduced. Decoupling through the terminal block 500 achieves flexible coupling between the first pin 211 and the positive input terminal 201, improves the reliability of the connection between the first pin 211 and the positive input terminal 201, and saves the connecting cable between the first pin 211 and the terminal block 500, thus improving assembly efficiency.

[0072] Please see Figure 11 , Figure 11 This is an exploded view of the first segment 21 provided in an embodiment of this application. The first segment 21 includes a first housing 212, a third pin 213, and a first moving contact 214. The first housing 212 houses the first moving contact 214, a portion of the first pin 211, and a portion of the third pin 213. The first segment 2111 of the first pin 211 is located outside the first housing 212, and the second segment 2112 of the first pin 211 is housed inside the first housing 212. The third pin 213 is the output terminal of the first segment 21, and is connected to the terminal block 500, thereby enabling the connection of the third pin 213 to a DC / DC circuit.

[0073] The first moving contact 214 is located between the first pin 211 and the third pin 213. Specifically, the first moving contact 214 is located between the second segment 2112 and the third pin 213, and the end of the second segment 2112 facing away from the first segment 2111 is used for conductive contact with the first moving contact 214. The first moving contact 214 can rotate relative to the first housing 212. When the first moving contact 214 is in contact with both the second segment 2112 and the third pin 213, the first split layer 21 is conductive; when the first moving contact 214 is separated from both the second segment 2112 and the third pin 213, the first split layer 21 is disconnected.

[0074] The first moving contact 214 includes at least two stacked metal sheets, and each end of the first moving contact 214 has a bayonet. When the first moving contact 214 rotates at a suitable angle relative to the first housing 212 (for example, 90°), the two ends of the first moving contact 214 clamp the first pin 211 and the third pin 213 through the bayonet, thereby achieving conductive contact between the first moving contact 214 and the first pin 211, and between the first moving contact 214 and the second pin 311.

[0075] In one embodiment, the third pin 213 can be connected to the terminal block 500 via an adapter such as a wire, a metal busbar (e.g., a copper busbar), or an OT terminal. In another embodiment, the third pin 213 can be directly fixed to the terminal block 500 by soldering or screwing, reducing the wire connection between the first split layer 21 and the terminal block 500.

[0076] In one embodiment, the first split layer 21 includes a first base 215 and a first top cover 216. In the same first split layer 21, the first base 215 is closer to the terminal block 500 in the first direction Z relative to the first top cover 216. The first base 215 and the first top cover 216 are connected and fixedly connected, and a space for receiving the first movable contact 214 is formed between the first base 215 and the first top cover 216. In two adjacent first split layers 21, the first base 215 of the first split layer 21 further away from the terminal block 500 is connected and fixedly connected to the first top cover 216 of the other first split layer 21, thereby realizing the transmission between the two adjacent first split layers 21.

[0077] Please see Figure 10 and Figure 12 , Figure 12 for Figure 10 The enlarged view of point XII in the power converter 1000 shown. The second pin 311 includes a third segment 3111 and a fourth segment 3112. The third segment 3111 is bent toward the terminal block 500 relative to the fourth segment 3112. The third segment 3111 is connected to the terminal block 500. The third segment 3111 can be directly fixed to the terminal block 500 by screws or welding. The layout of the second pin 311 and the negative input terminal 202 on the terminal block 500 can be flexibly adjusted. The maintainability of the negative input terminal 202 and the second pin 311 is better. Compared with the direct connection between the second pin 311 and the negative input terminal 202, the mechanical stress between the second pin 311 and the negative input terminal 202 is reduced. By decoupling through the terminal block 500, the flexible coupling between the second pin 311 and the negative input terminal 202 is achieved, which improves the reliability of the connection between the second pin 311 and the negative input terminal 202. It can also save the connection cable between the second pin 311 and the terminal block 500 and improve the assembly efficiency.

[0078] When the current-carrying capacity of the first segment 21 is greater than that of the second segment 31, the cross-section of the first segment 2111 is larger than that of the third segment 3111. This allows the first segment 2111, which connects to a greater number of positive terminals of photovoltaic strings, to safely and efficiently carry large currents, ensuring the reliability of the connection between the first segment 2111 and the terminal block 500. Conversely, when the current-carrying capacity of the second segment 31 is greater than that of the first segment 21, the cross-section of the first segment 2111 is smaller than that of the third segment 3111. This allows the third segment 3111, which connects to a greater number of negative terminals of photovoltaic strings, to safely and efficiently carry large currents.

[0079] Please see Figure 13 , Figure 13 This is an exploded view of the second split layer 31 provided in an embodiment of this application. The second split layer 31 includes a second housing 312, a fourth pin 313, and a second moving contact 314. The second housing 312 houses the second moving contact 314, a portion of the second pin 311, and a portion of the fourth pin 313. The third segment 3111 of the second pin 311 is located outside the second housing 312, and the fourth segment 3112 of the second pin 311 is located inside the second housing 312. The fourth pin 313 is the output terminal of the second split layer 31, and is connected to the terminal block 500, thereby enabling the fourth pin 313 to be connected to a DC / DC circuit.

[0080] The second moving contact 314 is located between the second pin 311 and the fourth pin 313. Specifically, the second moving contact 314 is located between the third segment 3111 and the fourth pin 313, and the end of the fourth segment 3112 facing away from the third segment 3111 is used for conductive contact with the second moving contact 314. The second moving contact 314 can rotate relative to the second housing 312. When the second moving contact 314 is in contact with both the fourth segment 3112 and the fourth pin 313, the second split layer 31 is conductive; when the second moving contact 314 is separated from both the fourth segment 3112 and the fourth pin 313, the second split layer 31 is disconnected.

[0081] The second moving contact 314 includes at least two stacked metal sheets, and each end of the second moving contact 314 includes a bayonet. When the second moving contact 314 rotates relative to the second housing 312 at a suitable angle (for example, 90°), the two ends of the second moving contact 314 clamp the second pin 311 and the fourth pin 313 through the bayonet, thereby achieving conductive contact between the second moving contact 314 and the second pin 311, and between the second moving contact 314 and the fourth pin 313.

[0082] In one embodiment, the fourth pin 313 can be connected to the terminal block 500 via an adapter such as a wire, a metal busbar (e.g., a copper busbar), or an OT terminal. In another embodiment, the third pin 213 can be directly fixed to the terminal block 500 by soldering or screwing, reducing the wire connections between the second split layer 31 and the terminal block 500.

[0083] In one embodiment, the second split layer 31 includes a second base 315 and a second top cover 316. Within the same second split layer 31, the second base 315 is closer to the terminal block 500 in the first direction Z relative to the second top cover 316. The second base 315 and the second top cover 316 are connected and fixedly connected, and the second base 315 and the second top cover 316 enclose a space for accommodating a portion of the second movable contact 314. In two adjacent second split layers 31, the second base 315 of one second split layer 31 is connected and fixedly connected to the second top cover 316 of the other second split layer 31, thereby realizing transmission between the two adjacent second split layers 31.

[0084] Please see Figure 14 , Figure 14 This is a schematic diagram of the disconnecting switch and terminal block provided in one embodiment of this application. The transmission member 51 is disposed along the first direction Z on the side of the first switch group 20 and the second switch group 30 opposite to the terminal block 500. When the transmission member 51 drives the first disconnect layer 21 and the second disconnect layer 31 to disconnect or connect, the transmission member 51, moving along the third direction X, will not cause wear to the terminal block 500. The transmission member 51 has a long, strip-shaped plate structure, with its plate surface facing the terminal block 500, thereby reducing the space occupied by the transmission member 51 in the power converter 1000.

[0085] The transmission member 51 is provided with a first rack portion 511 extending in the third direction X. The first rack portion 511 is located on one side of the transmission member 51 along the second direction Y. That is, a rack extending a certain length in the third direction X is formed on the side of the transmission member 51 along the second direction Y toward the first split layer 21 to form the first rack portion 511. The transmission assembly 50 also includes a first gear 54, which is connected to the first split layer 21 and meshes with the first rack portion 511. When the transmission member 51 moves in the third direction X under the drive of the operating mechanism 40, it drives the corresponding first gear 54 meshing with the first rack portion 511 to rotate, thereby transmitting power to the first split layer 21 through the rotating first gear 54, realizing the disconnection and conduction of the first split layer 21. By providing a first rack portion 511 extending in the third direction X on the transmission member 51, it is not necessary to add other gears or shafts to connect the first gear 54, which helps to reduce the size of the disconnect switch 100.

[0086] The first gear 54 is directly meshed with the first rack portion 511, and the transmission member 51 is located on the side of the first switch group 20 and the second switch group 30 facing away from the terminal block 500 along the first direction Z. That is to say, in the first switch group 20, along the first direction Z, the first gear 54 is located on the side of the first split layer 21 furthest from the terminal block 500 facing away from the terminal block 500. The first gear 54 is located on the side of all the first split layers 21 in the first switch group 20 facing away from the terminal block 500. In this way, the first gear 54 will not cause wear to the terminal block 500 when it rotates.

[0087] Please combine them together Figure 15 , Figure 15 This is an exploded view of the first segment 21, the first mounting base 22, and the first gear 54 provided in an embodiment of this application. The first gear 54 coincides with the axis of the first transmission shaft 52 and is fixed to the first transmission shaft 52. When the first gear 54 meshes with the first rack portion 511 extending in the third direction X and rotates, the transmission member 51 moves in the third direction X under the drive of the operating mechanism 40 to drive the first gear 54 to rotate, converting translation into rotation. Thus, the power is transmitted to the first transmission shaft 52 through the rotating first gear 54, realizing the rotation of the first transmission shaft 52.

[0088] The first gear 54 is used to drive the first moving contact 214 of the first split layer 21 of the first switch group 20 to rotate via the first transmission shaft 52, so as to open or close the first split layer 21 of the first switch group 20. In a first switch group 20, the first transmission shaft 52 rotates under the drive of the first gear 54, thereby driving the first moving contact 214 of all the first split layers 21 to rotate, so that all the first split layers 21 in the first switch group 20 are opened or closed.

[0089] The first switch assembly 20 also includes a first mounting base 22. The first mounting base 22 is located on the side of the first switch assembly 20 where all the first split layers 21 face the transmission member 51 along the first direction Z. The first mounting base 22 has an opening 221 that penetrates both opposite sides of the first mounting base 22. In a first switch assembly 20, a first gear 54 is located on the side of the first mounting base 22 facing away from all the first split layers 21. The first mounting base 22 provides insulation protection between all the first split layers 21 and the first gear 54 in the first switch assembly 20, which helps to improve the insulation performance at the first split layers 21.

[0090] One end of the first drive shaft 52 is fixed to the side of the first gear 54 facing the plurality of first split layers 21. The first drive shaft 52 and the first gear 54 can be connected and fixed by means of snap-fit, welding or other methods. In other embodiments, the first drive shaft 52 and the first gear 54 can be an integrally formed structure.

[0091] In one embodiment, the other end of the first drive shaft 52 is connected to the first top cover 216 closest to the first gear 54. The other end of the first drive shaft 52 passes through the opening 221 of the first mounting base 22 to connect with the first top cover 216. In the same first switch group 20, among two adjacent first split layers 21, the first base 215 in the first split layer 21 closest to the first gear 54 is connected to the first top cover 216 in the first split layer 21 away from the first gear 54. When the first gear 54 rotates, it drives the first top cover 216 closest to the first gear 54 to move through the first drive shaft 52. Since the first top cover 216 is fixedly connected to the first base 215, and the first moving contact 214 is housed between the first top cover 216 and the first base 215, when the first top cover 216 and the first base 215 move, they drive the first moving contact 214 to rotate, thereby realizing the disconnection or conduction of the first split layer 21. The rotating first base 215 drives the first top cover 216 in the adjacent first segment 21 to rotate, thereby causing the first moving contact 214 of the adjacent first segment 21 to rotate. That is to say, the other first segments 21 are linked through the first base 215 of one first segment 21 and the first top cover 216 of the other first segment 21. Each first moving contact 214 rotates together with its corresponding first base 215 and first top cover 216. The first drive shaft 52 does not need to pass through the first moving contact 214. It drives the first moving contact 214 to rotate through indirect transmission, ensuring the current carrying capacity of the first moving contact 214.

[0092] In another embodiment, the other end of the first drive shaft 52 passes through the first mounting base 22 and all the first moving contacts 214 in the first switch group 20. When the first drive shaft 52 rotates, it directly drives all the first moving contacts 214 in the first switch group 20 to rotate at the same time, thereby realizing the opening or closing of the first split layer 21 in the first switch group 20.

[0093] In this application, the transmission between two intersecting shafts (the shaft of the transmission member 51 extending along the third direction X and the corresponding first gear 54) is realized through the transmission of the first rack portion 511 extending along the third direction X and the first transmission shaft 52, thereby realizing the disconnection and conduction of the multiple first split layers 21 arranged along the first direction Z.

[0094] Please return to the reference. Figure 14The transmission member 51 also includes a second rack portion 512 extending along a third direction X. The second rack portion 512 is located on the other side of the transmission member 51 along the second direction Y. That is, a rack extending a certain length along the third direction X is formed on the side of the transmission member 51 facing the second split layer 31 along the second direction Y, thus forming the second rack portion 512. The transmission assembly 50 also includes a second gear 55, which is connected to the second split layer 31 and meshes with the second rack portion 512. When the transmission member 51 moves along the third direction X under the drive of the operating mechanism 40, it drives the second gear 55 meshing with the second rack portion 512 to rotate, thereby transmitting power to the second split layer 31 through the rotating second gear 55, realizing the disconnection or connection of the second split layer 31. By providing a second rack portion 512 extending along the third direction X on the transmission member 51, there is no need to provide other gears or shafts to connect the second gear 55, which helps to reduce the size of the disconnect switch 100.

[0095] Since the second rack portion 512 and the first rack portion 511 are mounted on the same transmission member 51, when the transmission member 51 moves along the third direction X, it can simultaneously drive the first rack portion 511 and the second rack portion 512 to move along the third direction X, thereby enabling the first gear 54 and the second gear 55 to move synchronously and improving the synchronization of the disconnect switch 100.

[0096] The second gear 55 is directly meshed with the second rack portion 512, and the transmission member 51 is located on the side of the first switch group 20 and the second switch group 30 away from the terminal block 500 along the first direction Z. That is to say, in the second switch group 30, the second gear 55 is located on the side of the second split layer 31 furthest from the terminal block 500 away from the terminal block 500. The second gear 55 is located on the side of all the second split layers 31 in the second switch group 30 away from the terminal block 500. In this way, the second gear 55 will not cause wear to the terminal block 500 when it rotates.

[0097] Please refer to the following: Figure 16 , Figure 16 This is an exploded view of the second segment 31, the second mounting base 32, and the second gear 55 provided in an embodiment of this application. The second gear 55 coincides with the axis of the second transmission shaft 53, and the second gear 55 is fixed to the second transmission shaft 53. When the second gear 55 meshes with the second rack portion 512 extending in the third direction X and rotates, the transmission member 51 moves in the third direction X under the drive of the operating mechanism 40 to drive the second gear 55 to rotate, converting translation into rotation. Thus, the power is transmitted to the second transmission shaft 53 through the rotating second gear 55, realizing the rotation of the second transmission shaft 53.

[0098] The second gear 55 is used to drive the second moving contact 314 of the second split layer 31 of the second switch group 30 to rotate via the second transmission shaft 53, so as to open or close the second split layer 31 of the second switch group 30. In one second switch group 30, the second transmission shaft 53 rotates under the drive of the second gear 55, thereby driving the second moving contact 314 of all the second split layers 31 to rotate, so that all the second split layers 31 in the second switch group 30 are opened or closed.

[0099] The second switch assembly 30 also includes a second mounting base 32, which is mounted on the side of the plurality of second split layers 31 of the second switch assembly 30 facing the transmission member 51 along the first direction Z. The second mounting base 32 is provided with through holes 321, which penetrate through both opposite sides of the second mounting base 32. In a second switch assembly 30, a second gear 55 is disposed on the side of the second mounting base 32 opposite to the plurality of second split layers 31. The second mounting base 32 provides insulation protection between all the second split layers 31 and the second gear 55 in the second switch assembly 30, which helps to improve the insulation performance at the second split layers 31.

[0100] One end of the second drive shaft 53 is fixed to the side of the second gear 55 facing the plurality of second split layers 31. The second drive shaft 53 and the second gear 55 can be connected and fixed by means of snap-fit, welding or other methods. In other embodiments, the second drive shaft 53 and the second gear 55 can be an integrally formed structure.

[0101] In one embodiment, the other end of the second drive shaft 53 passes through the through hole 321 of the second mounting base 32 to connect with the second top cover 316 closest to the second gear 55. In the same second switch group 30, among two adjacent second split layers 31, the second base 315 in the second split layer 31 closest to the second gear 55 is connected to the second top cover 316 in the second split layer 31 away from the second gear 55. When the second gear 55 rotates, it drives the second top cover 316 closest to the second gear 55 to move through the second drive shaft 53. Since the second top cover 316 is fixedly connected to the second base 315, and the second moving contact 314 is housed between the second top cover 316 and the second base 315, when the second top cover 316 and the second base 315 move, they drive the second moving contact 314 to rotate, thereby realizing the disconnection or conduction of the second split layer 31. The rotating second base 315 drives the second top cover 316 in the adjacent second segment 31 to rotate, thereby causing the second moving contact 314 of the adjacent second segment 31 to rotate. That is to say, the other second segments 31 are linked through the second base 315 of one second segment 31 and the second top cover 316 of the other two adjacent second segments 31. Each second moving contact 314 rotates together with its corresponding second base 315 and second top cover 316. The second drive shaft 53 does not need to pass through the second moving contact 314. It drives the second moving contact 314 to rotate through indirect transmission, ensuring the current carrying capacity of the second moving contact 314.

[0102] In another embodiment, the other end of the second drive shaft 53 passes through the second mounting base 32 and all the second moving contacts 314 in the second switch group 30. When the second drive shaft 53 rotates, it directly drives all the second moving contacts 314 in the second switch group 30 to rotate at the same time, thereby realizing the opening or closing of the second split layer 31 in the second switch group 30.

[0103] In this application, the transmission between two intersecting shafts (the shaft of the transmission member 51 extending along the third direction X and the corresponding second gear 55) is realized through the transmission of the second rack portion 512 extending along the third direction X and the second transmission shaft 53, thereby realizing the disconnection and conduction of the multiple second split layers 31 arranged along the first direction Z.

[0104] Please return to the reference. Figure 14The transmission assembly 50 also includes an output shaft 56 and a transmission wheel 57. The output shaft 56 is connected to the operating mechanism 40, and the output shaft 56 is connected to the transmission wheel 57. The output shaft 56 and the transmission wheel 57 are concentrically arranged, allowing for smooth and reliable transmission between them. The transmission wheel 57 is connected to the transmission component 51, and is located on the side of the output shaft 56 away from the terminal block 500 to prevent wear on the terminal block 500 caused by the rotation of the transmission wheel 57. The output shaft 56 is connected to a handle. By turning the handle, the user can rotate the transmission wheel 57 via the output shaft 56, causing the transmission wheel 57 to move the transmission component 51. Furthermore, the output shaft 56 is perpendicular to the transmission component 51, extending along the first direction Z. The output shaft 56 is perpendicular to the surface of the transmission component 51, and the transmission wheel 57 enables a 90° transmission between the output shaft 56 and the transmission component 51, allowing for simple and reliable 90° rotation operation between them. The output shaft 56 is arranged perpendicularly to the transmission component 51, which makes the transmission assembly 50 more compact and helps to reduce the size of the disconnect switch 100.

[0105] like Figure 14 As shown, in one embodiment, one end of the output shaft 56 can be directly connected to the handle, and the other end of the output shaft 56 can be directly connected to the transmission wheel 57, reducing transmission and enabling the transmission between the output shaft 56 and the transmission wheel 57 to operate smoothly and reliably.

[0106] In other embodiments, the transmission assembly 50 also includes an input shaft, which is perpendicular to the output shaft 56. One end of the input shaft is connected to the handle, and the other end of the input shaft is connected to the output shaft 56 through a bevel gear, so that the transmission assembly 50 can be placed horizontally. The input shaft can extend along the third direction X, and the input shaft does not need to be connected to the external handle through the wiring plate 500.

[0107] The transmission member 51 is also provided with a third rack portion 513, which extends along a third direction X and meshes with the transmission wheel 57. Thus, when the output shaft 56 drives the transmission wheel 57 to rotate, the transmission wheel 57 rotates at the third rack portion 513, thereby driving the transmission member 51 to move along a third direction X.

[0108] For example, the transmission component 51 includes a first part 514 and a second part 515. The first part 514 has a third rack portion 513 on one side along the second direction Y, and the second part 515 has a first rack portion 511 and a second rack portion 512 on opposite sides along the second direction Y, respectively. The dimension of the first part 514 along the second direction Y is smaller than the dimension of the second part 515 along the second direction Y. In this way, the transmission wheel 57 can be set to be smaller relative to the first gear 54 and the second gear 55, making the overall structure of the transmission component 50 more compact, which is beneficial to the miniaturization design of the disconnect switch 100.

[0109] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A power converter, characterized in that, The device includes a power conversion circuit, a positive input terminal, a negative input terminal, a disconnect switch, and a terminal block. The positive and negative input terminals are mounted on the terminal block and are used to connect to the positive and negative terminals of a photovoltaic string, respectively. The power conversion circuit converts the direct current (DC) from the photovoltaic string into alternating current (AC) and supplies the AC to the power grid or a load. The positive and negative input terminals are connected to the power conversion circuit via the disconnect switch. The disconnect switch includes an operating mechanism, a first switch group, a second switch group, and a transmission assembly. The first switch group includes at least one first split layer stacked along a first direction, and the second switch group includes at least one second split layer stacked along the first direction. The first split layer of the first switch group is connected to the positive input terminal, and the second split layer of the second switch group is connected to the negative input terminal. Along the second direction, the first segment and the second segment are distributed opposite to each other, the first direction is perpendicular to the surface of the terminal block, and the first direction and the second direction are perpendicular to each other; The transmission assembly includes a transmission component, a first transmission shaft, and a second transmission shaft. The operating mechanism is connected to the transmission component, and the transmission component is connected to the first and second transmission shafts. The transmission component is used to move under the drive of the operating mechanism to drive the first and second transmission shafts to rotate. The first transmission shaft is connected to the first switch group and is used to open or close the first break of the first switch group. The second transmission shaft is connected to the second switch group and is used to open or close the second break of the second switch group.

2. The power converter according to claim 1, characterized in that, There are multiple first switch groups and multiple second switch groups. Multiple first switch groups are arranged along a third direction, and multiple second switch groups are arranged along the third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

3. The power converter according to claim 2, characterized in that, The transmission component is provided with a first rack portion and a second rack portion extending along the third direction. The transmission assembly also includes a first gear and a second gear. The first gear coincides with the axis of the first transmission shaft and is fixed to the first transmission shaft. The first gear meshes with the first rack portion. The second gear coincides with the axis of the second transmission shaft, and the second gear is fixed to the second transmission shaft. The second gear meshes with the second rack portion.

4. The power converter according to claim 3, characterized in that, The first gear is used to drive the first moving contact of the first split layer of the first switch group to rotate via the first transmission shaft, so as to open or close the first split layer of the first switch group. The second gear is used to drive the second moving contact of the second split layer of the second switch group to rotate via the second transmission shaft, so as to open or close the second split layer of the second switch group.

5. The power converter according to any one of claims 1-4, characterized in that, The current carrying capacity of the first fault layer is greater than that of the second fault layer, the number of first fault layers in the first switch group is less than the number of second fault layers in the second switch group, and the number of positive electrodes of the photovoltaic string connected to the first switch group is equal to the number of negative electrodes of the photovoltaic string connected to the second switch group.

6. The power converter according to any one of claims 1-4, characterized in that, The current carrying capacity of the second fault layer is greater than that of the first fault layer, the number of first fault layers in the first switch group is greater than the number of second fault layers in the second switch group, and the number of positive electrodes of the photovoltaic string connected to the first switch group is equal to the number of negative electrodes of the photovoltaic string connected to the second switch group.

7. The power converter according to any one of claims 1-6, characterized in that, The disconnect switch is disposed on the terminal block. The first disconnect layer has a first pin, which is connected to the positive input terminal through the terminal block. The second disconnect layer has a second pin, which is connected to the negative input terminal through the terminal block.

8. The power converter according to any one of claims 1-7, characterized in that, The transmission assembly further includes an output shaft and a transmission wheel. The operating mechanism is connected to the output shaft, the output shaft is connected to the transmission wheel, the output shaft is perpendicular to the transmission component, and the transmission wheel is connected to the transmission component.

9. A disconnecting switch, characterized in that, The disconnect switch includes an operating mechanism, a first switch group, a second switch group, and a transmission assembly. The first switch group includes at least one first split layer stacked along a first direction, and the second switch group includes at least one second split layer stacked along the first direction. The first split layer of the first switch group is connected to the positive terminal of the photovoltaic string, and the second split layer of the second switch group is connected to the negative terminal of the photovoltaic string. The first split layer and the second split layer are distributed opposite to each other along a second direction, and the first direction and the second direction are perpendicular to each other. The transmission assembly includes a transmission component, a first transmission shaft, and a second transmission shaft. The operating mechanism is connected to the transmission component, and the transmission component is connected to the first and second transmission shafts. The transmission component is used to move under the drive of the operating mechanism to drive the first and second transmission shafts to rotate. The first transmission shaft is connected to the first switch group and is used to open or close the first break of the first switch group. The second transmission shaft is connected to the second switch group and is used to open or close the second break of the second switch group.

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