Power converter

Abstract

The utility model relates to the technical field of power electronics, and provides a power converter, the power converter comprises a rotary switch, a plurality of positive terminals and a plurality of negative terminals, and the rotary switch comprises a driving shaft, an electrical isolation assembly and at least one pair of switch units. The switch unit comprises a first switch unit and a second switch unit which are arranged on a driver, and an electric isolation assembly is arranged between the adjacent first switch unit and second switch unit. The first switch unit and the second switch unit each comprise a plurality of switch poles, and the switch poles are sequentially arranged on the driving shaft in the axis direction of the driving shaft. The plurality of positive terminals are connected with the plurality of switch poles of the first switch unit in a one-to-one correspondence manner, and are used for being connected with the positive poles of the plurality of photovoltaic modules in a one-to-one correspondence manner. The plurality of negative terminals are connected with the plurality of switch poles of the second switch unit in a one-to-one correspondence manner, and are used for being connected with the negative poles of the plurality of photovoltaic modules in a one-to-one correspondence manner. The power converter can realize better insulation between the positive electrode and the negative electrode of a photovoltaic module in a photovoltaic power generation system.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a power converter. Background Art

[0002] In a photovoltaic power generation system, multiple photovoltaic panels are usually connected in series to form a photovoltaic module, and multiple photovoltaic modules are then connected in parallel to a power converter (for example, a photovoltaic inverter). In some scenarios, the power converter can have up to 28 photovoltaic module inputs. Power converters often use rotary switches to achieve the purpose of individually isolating, protecting, and disconnecting photovoltaic modules. The rotary switch usually includes multiple switch poles, which are respectively connected to the positive / negative poles of the photovoltaic module. The voltage of the photovoltaic module is usually high. For example, in some scenarios, the voltage of the photovoltaic module is 1500V DC. As a result, from the perspective of safety, it is necessary to have good insulation between the positive and negative poles of the photovoltaic module. Utility Model Content

[0003] The embodiment of the present application provides a power converter, which can improve the insulation performance between the positive and negative poles of a photovoltaic string in a photovoltaic power generation system.

[0004] An embodiment of the present application provides a power converter, which includes a rotary switch, multiple positive terminals and multiple negative terminals. The rotary switch includes a drive shaft, an electrical isolation component and at least one pair of switch units; each pair of switch units includes a first switch unit and a second switch unit adjacent to the drive shaft, and the first switch unit and the second switch unit each include multiple switch poles, and each switch pole is sequentially arranged on the drive shaft along the axial direction of the drive shaft; the multiple positive terminals are connected to the multiple switch poles of the first switch unit in a one-to-one correspondence, and the multiple positive terminals are also used to be connected to the positive poles of multiple photovoltaic modules in a one-to-one correspondence; the multiple negative terminals are connected to the multiple switch poles of the second switch unit in a one-to-one correspondence, and the multiple negative terminals are also used to be connected to the negative poles of multiple photovoltaic modules in a one-to-one correspondence; each switch The switch poles all include a switch assembly and a first insulating shell, the switch assembly is arranged in the first insulating shell, and the switch assembly has a contact point exposed from the first insulating shell, and the contact point is used to electrically connect with the corresponding positive terminal or negative terminal; the drive shaft is rotatably connected to each first insulating shell, the switch assembly includes a moving contact and a static contact, the moving contact is relatively fixed to the drive shaft, and the moving contact of each switch assembly synchronously contacts or separates with the static contact of each switch assembly in response to the rotation of the drive shaft; in the rotary switch, an electrical isolation assembly is provided between adjacent first switch units and second switch units, at least part of the electrical isolation assembly is located between the first contact point and the second contact point, and the first contact point and the second contact point are contact points of two adjacent switch poles between the first switch unit and the second switch unit. When the power converter provided in the present application is applied to a photovoltaic power generation system, the positive pole of each photovoltaic component is electrically connected to the switch pole in the first switch unit, and the negative pole of each photovoltaic component is electrically connected to the switch pole in the second switch unit. Through the double electrical isolation of each first insulating shell and the electrical isolation component, the positive and negative poles of the photovoltaic components can be better insulated, thereby improving the safety of multi-channel power input.

[0005] In a possible technical solution, the electrical isolation component is rotatably arranged on the drive shaft, and the electrical isolation component is fixedly connected to the first insulating housings of the two switch poles adjacent to the electrical isolation component. In this solution, the electrical isolation component is arranged on the drive shaft in the same or similar manner as the first insulating housing on the drive shaft, and the electrical isolation component can be assembled to the drive shaft during the process of assembling each switch pole to the drive shaft, thereby making the assembly of the rotary switch more convenient and more efficient.

[0006] In a possible technical solution, the electrical isolation component protrudes from the first surface of each first insulating shell, and the first surface is the surface where the contact point of the insulating shell is located, so as to play a good electrical isolation role.

[0007] In a possible technical solution, each first insulating shell has an insulating partition protruding from the first surface, each insulating partition extends along a first direction and isolates the contact points of two adjacent switch poles between the first switch unit and the second switch unit, and the first direction is perpendicular to the axial direction of the drive shaft and parallel to the first surface; the electrical isolation component is fixed on the insulating partition of the first insulating shell of any one of the two adjacent switch poles in the first switch unit and the second switch unit to achieve better electrical isolation.

[0008] In a possible technical solution, the electrical isolation component is a plate-like structure in a direction away from the first surface, and the plate-like structure includes a second surface and a third surface opposite to each other along the axial direction of the drive shaft; the second surface and the third surface extend in a direction away from the first surface, and the distance between the second surface and the third surface gradually decreases as they are farther away from the first surface. In this solution, while achieving electrical isolation, the manufacturing of the electrical isolation component also saves more materials, which is conducive to reducing costs.

[0009] In one possible technical solution, the material of the electrical isolation component is rubber. In this case, while achieving good electrical isolation, if the electrical isolation component includes the above-mentioned trapezoidal structure, the electrical isolation component is not easily bent due to the heat of the power converter, and the structural stability of the electrical isolation component is better.

[0010] In a possible technical solution, the electrical isolation component includes an insulating plate or an insulating box having a receiving cavity. When the electrical isolation component is an insulating plate, the manufacturing process of the electrical isolation component is simplified, which is beneficial to improve production efficiency. When the electrical isolation component is an insulating box, the distance between the first switch unit and the second switch unit is larger, which is beneficial to improve the insulation effect between the first switch unit and the second switch unit.

[0011] In a possible technical solution, the rotary switch also includes an operating mechanism, which is located at one end of the drive shaft and connected to the drive shaft, and is used to drive each switch pole to synchronously switch between closing and opening through the drive shaft.

[0012] In a possible technical solution, the power converter includes at least one maximum power point tracking circuit and an inverter circuit; the switch pole in the first switch unit is the first switch pole, the switch pole in the second switch unit is the second switch pole, the positive input end of each maximum power point tracking circuit is electrically connected to at least one first switch pole, the negative input end of each maximum power point tracking circuit is electrically connected to at least one second switch pole, and the output end of the maximum power point tracking circuit is used to connect to the inverter circuit.

[0013] Taking the direction from the first switch pole to the second switch pole as the second direction, in a possible technical solution, along the second direction, the order of the first switch pole electrically connected to the positive input end of the maximum power point tracking circuit in the first switch unit where the first switch pole is located is the same as the order of the second switch pole electrically connected to the negative input end of the same maximum power point tracking circuit in the second switch unit where the second switch pole is located. In this solution, the lengths of the circuits can be made the same or close, which is conducive to ensuring the synchronization of the circuits.

[0014] Another power converter provided in an embodiment of the present application includes a rotary switch, a plurality of positive terminals and a plurality of negative terminals, wherein the rotary switch includes a drive shaft, an operating mechanism and at least one pair of switch units. Each pair of switch units includes a first switch unit and a second switch unit disposed adjacent to the drive shaft, wherein the first switch unit and the second switch unit each include a plurality of switch poles, and each switch pole is sequentially disposed on the drive shaft along the axial direction of the drive shaft. The plurality of positive terminals are connected one-to-one with the plurality of switch poles of the first switch unit, and the plurality of positive terminals are also used to be connected one-to-one with the positive poles of the plurality of photovoltaic modules. The plurality of negative terminals are connected one-to-one with the plurality of switch poles of the second switch unit, and the plurality of negative terminals are also used to be connected with the negative poles of the plurality of photovoltaic modules. Each switch pole includes a switch assembly and a first insulating housing, wherein the switch assembly is disposed in the first insulating housing, and the switch assembly has a contact point exposed to the first insulating housing. The drive shaft is rotationally connected to each first insulating housing, the switch assembly includes a moving contact and a static contact, the moving contact is relatively fixed to the drive shaft, and the moving contact of each switch assembly contacts or separates with the static contact of each switch assembly in response to the rotation of the drive shaft. The operating mechanism is connected to the drive shaft, and the operating mechanism is used to drive the switch pole to switch synchronously between closing and opening through the drive shaft. Among them, the operating mechanism includes a second insulating housing, and the operating mechanism is located between a pair of adjacent first switch units and second switch units. In this way, there is no need to set a separate electrical isolation component between the pair of adjacent first switch units and the second switch unit. On the basis of making the rotary switch have double electrical isolation, the structure of the rotary switch can also be simplified.

[0015] In a possible technical solution, the rotary switch includes multiple pairs of switch units arranged in sequence on the drive shaft, wherein the first switch unit in each pair of switch units is located on one side of the operating mechanism, and the second switch unit in each pair of switch units is located on one side of the operating mechanism. In this way, when connecting each switch pole with the corresponding positive terminal or negative terminal, it is easier to distinguish the first switch unit from the second switch unit, and the connection operation between each switch pole and the corresponding positive terminal or negative terminal is also more convenient.

[0016] In a possible technical solution, along the axial direction of the drive shaft, the number of switch poles on both sides of the operating mechanism is the same. That is, the operating mechanism is located in the middle of the drive shaft, and the operating mechanism drives the switch poles on both sides thereof. Compared with the single-sided drive of the operating mechanism, the double-sided drive of the operating mechanism in this solution can drive more switch poles and improve the driving efficiency of the operating mechanism, which is conducive to achieving higher power of the power converter.

[0017] In a possible technical solution, the power converter includes at least one maximum power point tracking circuit and an inverter circuit; the switch pole in the first switch unit is the first switch pole, the switch pole in the second switch unit is the second switch pole, the positive input end of each maximum power point tracking circuit is electrically connected to at least one first switch pole, the negative input end of each maximum power point tracking circuit is electrically connected to at least one second switch pole, and the output end of the maximum power point tracking circuit is used to connect to the inverter circuit.

[0018] Taking the direction from the first switch pole to the second switch pole as the second direction, in a possible technical solution, along the second direction, the order of the first switch pole electrically connected to the positive input end of the maximum power point tracking circuit in the first switch unit where the first switch pole is located is the same as the order of the second switch pole electrically connected to the negative input end of the same maximum power point tracking circuit in the second switch unit where the second switch pole is located. In this solution, the lengths of the circuits can be made the same or close, which is conducive to ensuring the synchronization of the circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a power converter provided in this application;

[0020] Figure 2 A partial stereoscopic diagram of a rotary switch in a power converter provided by the present application;

[0021] Figure 3 for Figure 2 a side view of the rotary switch shown;

[0022] Figure 4 A three-dimensional diagram of an electrical isolation assembly of a rotary switch in a power converter provided by the present application;

[0023] Figure 5 A schematic diagram of a rotary switch in a power converter provided by the present application;

[0024] Figure 6 A schematic diagram of another power converter provided by the present application;

[0025] Figure 7 A schematic diagram of another power converter provided by the present application;

[0026] Figure 8 A schematic diagram of a power converter provided in the present application in an application scenario;

[0027] Fig. 9 A schematic diagram of the structure of a power converter provided in this application;

[0028] Fig.10 A schematic diagram of a power converter provided in the present application;

[0029] Fig.11 A schematic diagram of another power converter provided in the present application. DETAILED DESCRIPTION

[0030] Photovoltaic power generation system is a system that uses solar energy to generate electricity. It converts solar energy into electrical energy, thereby providing people with clean and renewable energy. Specifically, the photovoltaic power generation system includes a photovoltaic module, which converts solar energy into direct current through the photovoltaic effect, and a power converter (for example, a photovoltaic inverter) converts the direct current output by the photovoltaic module into alternating current. A rotary switch is usually connected to the photovoltaic module. When the photovoltaic module needs to be maintained, repaired or replaced, it is necessary to disconnect the circuit through a rotary switch to ensure that no danger is caused to personnel and equipment when maintaining and repairing the photovoltaic power generation system. Since the voltage of the photovoltaic module is usually high, it is necessary to have good insulation between the positive and negative poles of the photovoltaic module from the perspective of safety. However, in the prior art, the insulation between the positive and negative poles of the photovoltaic module is not ideal.

[0031] Based on this, the embodiment of the present application provides a power converter to solve the above problems. In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0032] It is worth noting that the terms used in the following embodiments are only for the purpose of describing specific embodiments, and are not intended to be used as limitations on the present application. As used in the specification and the appended claims of the present application, the singular expressions "one", "a kind of", "said", "above", "the" and "this" are intended to also include such expressions as "one or more", unless there is a clear contrary indication in the context. The reference "one embodiment" or "some embodiments" described in this specification means that the specific features, structures or characteristics described in conjunction with the embodiment are included in one or more embodiments of the present application. Thus, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in the differences in this specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "include", "comprise", "have" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0033] Figure 1 A schematic diagram of the structure of a power converter provided in this application. Figure 1 As shown, a power converter provided by the present application includes a rotary switch (not marked in the figure), a plurality of positive terminals 6 and a plurality of negative terminals 7, wherein the rotary switch includes a drive shaft 1, an electrical isolation assembly 2 and at least one pair of switch units 3. It is not difficult to understand that each pair of switch units 3 includes two switch units 3. Specifically, each pair of switch units 3 includes a first switch unit 31 and a second switch unit 32 adjacently arranged on the drive shaft 1, and the first switch unit 31 and the second switch unit 32 each include a plurality of switch poles 311, and each switch pole 311 is sequentially arranged on the drive shaft 1 along the axial direction of the drive shaft 1. When each switch pole 311 is specifically arranged, exemplarily, each switch pole 311 includes a switch assembly and a first insulating shell 3111, and it is not difficult to understand that the first insulating shell 3111 has a accommodating cavity, the switch assembly is arranged in the first insulating shell 3111, and the switch assembly has a contact point 3112 exposed in the first insulating shell 3111 to be electrically connected to the corresponding positive terminal 6 or negative terminal 7. Further, the drive shaft 1 passes through each first insulating housing 3111 and is rotatably connected to each first insulating housing 3111. It is not difficult to understand that the drive shaft 1 is used to receive external force, so that the drive shaft 1 can rotate around the axis m of the drive shaft 1 itself relative to each first insulating housing 3111. Exemplarily, the switch assembly includes a moving contact and a stationary contact, the moving contact is relatively fixed to the drive shaft 1, and the moving contact of each switch assembly contacts or separates with the stationary contact of each switch assembly in response to the rotation of the drive shaft 1. It is not difficult to understand that the drive shaft 1 is electrically insulated from each switch pole 311.

[0034] Next, please continue to refer to Figure 1 , multiple positive terminals 6 are connected to multiple switch poles 311 of the first switch unit 31 in one-to-one correspondence, and in addition, multiple positive terminals 6 are also used to be connected to the positive poles of multiple photovoltaic modules in one-to-one correspondence. Multiple negative terminals 7 are connected to multiple switch poles 311 of the second switch unit 32 in one-to-one correspondence, and in addition, multiple negative terminals 7 are also used to be connected to the negative poles of multiple photovoltaic modules in one-to-one correspondence. An electrical isolation component 2 is provided between adjacent first switch units 31 and second switch units 32. Further, the contact points of two adjacent switch poles 311 between the first switch unit 31 and the second switch unit 32 are taken as the first contact point and the second contact point, and at least part of the electrical isolation component 2 is located between the first contact point and the second contact point. In other words, the contact points of the adjacent first switch unit 31 and the second switch unit 32 are electrically isolated by the electrical isolation component 2. When the power converter provided in the present application is applied to a photovoltaic power generation system, the positive pole of each photovoltaic component is electrically connected to the switch pole 311 in the first switch unit 31, and the negative pole of each photovoltaic component is electrically connected to the switch pole 311 in the second switch unit 32. Through the double electrical isolation of each first insulating shell 3111 and the electrical isolation component 2, the positive and negative poles of the photovoltaic components can be better insulated, thereby improving the safety of multi-channel power input.

[0035] Figure 2 A partial stereoscopic diagram of a rotary switch in a power converter provided by the present application is shown. Figure 3 Shows Figure 2 The side view of the rotary switch shown below is combined with Figure 2 and Figure 3 The structure of the rotary switch is introduced in detail. Figure 2 and Figure 3 As shown, the rotary switch includes a plurality of switch poles 311 arranged along the axis m of the drive shaft 1 (not visible in the figure), the first insulating shell 3111 of each switch pole 311 is in the shape of a rectangular parallelepiped, a pair of opposite side walls of the first insulating shell 3111 are provided with connecting ears 3114, each connecting ear 3114 is provided with a through hole penetrating along the axial direction of the drive shaft 1, the rod of the bolt 200 passes through the through hole of each connecting ear 3114 and cooperates with the nut to fix the first insulating shell 3111 of each switch pole. Next, for ease of understanding, the surface where the contact point of the first insulating shell 3111 is located is the first surface a. In specific implementation, the electrical isolation component 2 protrudes from the first surface a of each first insulating shell 3111 to play a good electrical isolation role.

[0036] Taking the first direction A as a direction perpendicular to the axial direction of the drive shaft and parallel to the first surface a, in a possible implementation, each first insulating shell 3111 has an insulating partition 3113 protruding from the first surface a, and each insulating partition 3113 extends along the first direction A and isolates the contact points of two adjacent switch poles between the first switch unit and the second switch unit. The electrical isolation component 2 is fixed on the insulating partition 3113 of the first insulating shell of any one of the two adjacent switch poles in the first switch unit 31 and the second switch unit 32. That is to say, the electrical isolation component 2 is fixed to the insulating partition 3113 of the first insulating shell 3111 of the switch pole 311 adjacent to the second switch unit 32 in the first switch unit 31, or the electrical isolation component 2 is fixed to the insulating partition 3113 of the first insulating shell 3111 of the switch pole 311 adjacent to the first switch unit 31 in the second switch unit 32. Exemplarily, Figure 4 FIG. 2 shows a stereoscopic view of an electrical isolation component 2 of a rotary switch in a power converter provided by the present application. Figure 3 and Figure 4 One of the ends of the insulating partition 3113 opposite to the first surface a of the corresponding first insulating housing 3111 and the end of the electrical isolation component 2 close to the first surface a of the corresponding first insulating housing 3111 is provided with a snap-in groove 201, and the other is provided with a snap-in protrusion 202 matching the snap-in 201, and the snap-in protrusion 202 is snap-fitted with the snap-in groove 201, thereby achieving a fixed connection between the insulating partition 3113 and the electrical isolation component 2. In a specific implementation, the snap-in groove 201 is a cross groove or a dovetail groove that penetrates the corresponding insulating partition 3113 or the electrical isolation component 2 along the first direction A.

[0037] Next, please combine Figure 2 and Figure 4 In a possible implementation, the electrical isolation component 2 is a plate-like structure in a direction away from the first surface a. Specifically, the plate-like structure includes a second surface b and a third surface c that are opposite to each other along the axial direction of the drive shaft; the second surface b and the third surface c extend in a direction away from the first surface a, and the distance between the second surface b and the third surface c gradually decreases as they are farther away from the first surface a. For example, the cross-section of the end of the electrical isolation component 2 that is opposite to the corresponding switch pole 311 on a plane perpendicular to the first direction A is a trapezoid, such as an isosceles trapezoid. In this solution, while achieving electrical isolation, the manufacture of the electrical isolation component 2 is more material-saving, which is conducive to cost reduction. Exemplarily, the material of the electrical isolation component 2 is rubber. In this case, while achieving good electrical isolation, if the electrical isolation component 2 includes the above-mentioned trapezoidal structure, the electrical isolation component 2 is not easy to bend due to the heat of the power converter, and the structural stability of the electrical isolation component 2 is better.

[0038] Of course, the structure and arrangement of the electrical isolation component 2 are not limited to the above situation. For example, Figure 1 As shown, in another possible implementation, the electrical isolation component 2 is rotatably disposed on the drive shaft 1, and the electrical isolation component 2 is fixedly connected to the first insulating housings 3111 of the two switch poles 311 adjacent to the electrical isolation component 2. In other words, the electrical isolation component 2 is connected in series with the first insulating housings 3111 of each switch pole 311. In this solution, the electrical isolation component 2 is arranged on the drive shaft 1 in the same or similar manner as the first insulating housing 3111 on the drive shaft 1. In the process of assembling each switch pole 311 to the drive shaft 1, the electrical isolation component 2 can also be assembled to the drive shaft 1, thereby making the assembly of the rotary switch more convenient and more efficient.

[0039] When the electrical isolation component 2 is specifically configured, the electrical isolation component 2 may include an insulating plate 21 or an insulating box having a receiving cavity. It is worth noting that when the electrical isolation component 2 is an insulating plate 21, the manufacturing process of the electrical isolation component 2 is simplified, which is beneficial to improve production efficiency. When the electrical isolation component 2 is an insulating box, the distance between the first switch unit 31 and the second switch unit 32 is larger, which is beneficial to improve the insulation effect between the first switch unit 31 and the second switch unit 32.

[0040] Figure 5 FIG. 1 is a schematic diagram of a rotary switch in a power converter provided by the present application. Figure 5 As shown, in some implementations, the rotary switch further includes an operating mechanism 4, which is located at one end of the drive shaft 1 and connected to the drive shaft 1, and the operating mechanism 4 is used to drive each switch pole 311 to switch synchronously between closing and opening through the drive shaft 1. Exemplarily, the operating mechanism 4 may include a handle 41 exposed outside the operating mechanism 4, and the user drives the drive shaft 1 through the operating handle 41 to perform closing and opening operations of the rotary switch. Further, the rotary switch further includes a release, which is transmission-connected to the operating mechanism 4, and the release can drive the drive shaft 1 to drive the moving contact to rotate according to the command of the controller, so that the moving contact is separated from the corresponding static contact to open the rotary switch.

[0041] Figure 6 FIG. 2 shows a schematic diagram of another power converter provided by the present application. Figure 6As shown, the power converter includes a rotary switch, a plurality of positive terminals 6 and a plurality of negative terminals 7, wherein the rotary switch includes a drive shaft 1, an operating mechanism 4 and at least one pair of switch units 3. Specifically, each pair of switch units 3 includes a first switch unit 31 and a second switch unit 32 adjacently arranged on the drive shaft 1, and the first switch unit 31 and the second switch unit 32 each include a plurality of switch poles 311, and each switch pole 311 is sequentially arranged on the drive shaft 1 along the axial direction of the drive shaft 1. The plurality of positive terminals 6 are connected to the plurality of switch poles 311 of the first switch unit 31 in a one-to-one correspondence, and the plurality of positive terminals 6 are also used to be connected to the positive poles of the plurality of photovoltaic modules in a one-to-one correspondence. The plurality of negative terminals 7 are connected to the plurality of switch poles 311 of the second switch unit 32 in a one-to-one correspondence, and the plurality of negative terminals 7 are also used to be connected to the negative poles of the plurality of photovoltaic modules. When each switch pole 311 is specifically set, each switch pole 311 includes a switch assembly and a first insulating shell 3111. It is not difficult to understand that the first insulating shell 3111 has a accommodating cavity, the switch assembly is arranged in the first insulating shell 3111, and the switch assembly has a contact point exposed in the first insulating shell 3111 to be electrically connected to the corresponding positive terminal 6 or negative terminal 7. The drive shaft 1 passes through each first insulating shell 3111 and is rotatably connected to each first insulating shell 3111. The drive shaft 1 is used to receive external force, so that the drive shaft 1 can rotate around the axis m of the drive shaft 1 relative to each first insulating shell 3111. The switch assembly includes a moving contact and a static contact, the moving contact is relatively fixed to the drive shaft 1, and the moving contact of each switch assembly contacts or separates with the static contact of each switch assembly in response to the rotation of the drive shaft 1. It is not difficult to understand that the drive shaft 1 is electrically insulated from each switch pole 311. Further, the operating mechanism 4 is connected to the drive shaft 1, and the operating mechanism 4 is used to drive the switch pole 311 to switch synchronously between closing and opening through the drive shaft 1. Specifically, the operating mechanism 4 includes a second insulating shell, and the operating mechanism 4 is located between a pair of adjacent first switch units 31 and second switch units 32. In other words, the second insulating shell of the operating mechanism 4 serves as an electrical isolation component 2 between a pair of adjacent first switch units 31 and second switch units 32. In this way, there is no need to set a separate electrical isolation component 2 between the pair of adjacent first switch units 31 and second switch units 32, and on the basis of making the rotary switch have double electrical isolation, the structure of the rotary switch can also be simplified.

[0042] In specific implementation, except where the operating mechanism 4 is located, an electrical isolation component 2 is disposed between other adjacent first switch units 31 and second switch units 32 to achieve better electrical isolation. The specific configuration of the electrical isolation component 2 can refer to the electrical isolation component 2 mentioned above.

[0043] In some embodiments, the rotary switch includes a plurality of pairs of switch units 3 sequentially arranged on the drive shaft 1, wherein the first switch unit 31 in each pair of switch units 3 is located on one side of the operating mechanism 4, and the second switch unit 32 in each pair of switch units 3 is located on the other side of the operating mechanism 4. In this way, when connecting each switch pole 311 with the corresponding positive terminal 6 or negative terminal 7, it is easier to distinguish the first switch unit 31 and the second switch unit 32, and the connection operation between each switch pole 311 and the corresponding positive terminal 6 or negative terminal 7 is also more convenient.

[0044] In a specific implementation, along the axial direction of the drive shaft 1, the number of switch poles 311 located on both sides of the operating mechanism 4 is the same. That is, the operating mechanism 4 is located in the middle of the drive shaft 1, and the operating mechanism 4 drives the switch poles 311 on both sides thereof. Compared with the unilateral drive of the operating mechanism 4, the dual-sided drive of the operating mechanism 4 in this solution can drive more switch poles 311 and improve the driving efficiency of the operating mechanism 4, thereby facilitating the realization of higher power of the power converter.

[0045] Figure 7 FIG. 2 shows a schematic diagram of another power converter provided by the present application. Figure 7 As shown, the power converter includes at least one maximum power point tracking (MPPT) circuit 9 and an inverter circuit (not shown in the figure). For ease of understanding, the switch pole 311 in the first switch unit 31 is the first switch pole, the switch pole 311 in the second switch unit 32 is the second switch pole, the positive input end of each maximum power point tracking circuit 9 is electrically connected to at least one first switch pole, and the negative input end of each maximum power point tracking circuit 9 is electrically connected to at least one second switch pole, and the output end of the maximum power point tracking circuit is used to connect to the inverter circuit. It is not difficult to understand that the number of first switch poles connected to the positive input end of the maximum power point tracking circuit 9 is the same as the number of second switch poles connected to the negative input end.

[0046] Furthermore, the direction from the first switch pole to the second switch pole is the second direction B. Along the second direction B, the order of the first switch pole electrically connected to the positive input end of the maximum power point tracking circuit 9 in the first switch unit 31 where the first switch pole is located is the same as the order of the second switch pole electrically connected to the negative input end of the same maximum power point tracking circuit 9 in the second switch unit 32 where the second switch pole is located. Figure 7As shown, in some embodiments, at least one maximum power point tracking circuit 9 is electrically connected to the first switch pole and the second switch pole corresponding to a photovoltaic component 8, and the two switch poles C1 and C2 electrically connected to the maximum power point tracking circuit 9 are arranged in the same order in the switch units 3 where the two switch poles 311 are respectively located. For example, if along the second direction B, the switch pole C1 is ranked first in the switch unit 3 where it is located, then the switch pole C2 is also ranked first in the switch unit 3 where it is located; if along the second direction B, the switch pole C1 is ranked third in the switch unit 3 where it is located, then the switch pole C2 is also ranked third in the switch unit 3 where it is located. In this scheme, the lengths of each circuit can be made the same or close, which is conducive to ensuring the synchronization of the circuits. Of course, the order of the first switch pole and the second switch pole electrically connected to the maximum power point tracking circuit 9 in the switch units 3 where the two switch poles 311 are respectively located may also be different, for example: Figure 8 As shown, along the second direction B, the switch pole C1 is ranked first in the switch unit 3 where it is located, and the switch pole C2 is also ranked eighth in the switch unit 3 where it is located.

[0047] Next, please refer to Fig. 9 The schematic diagram of the power converter is shown in FIG. Fig. 9As shown, in other embodiments, at least one maximum power point tracking circuit 9 is electrically connected to the first switch poles and the second switch poles corresponding to the plurality of photovoltaic components 8, that is, the positive input terminal of the at least one maximum power point tracking circuit 9 is electrically connected to the plurality of first switch poles, and the negative input terminal is electrically connected to the plurality of second switch poles. In this case, the connection between the at least one maximum power point tracking circuit 9 and the corresponding switch pole 311 can be connected by on-board closing wire connection. Furthermore, the order of each switch pole 311 connected to one end of the at least one maximum power point tracking circuit 9 in the switch unit 3 where each switch pole 311 itself is located is the same as the order of each switch pole 311 connected to the other end of the at least one maximum power point tracking circuit 9 in the switch unit 3 where each switch pole 311 itself is located. Taking the example that each maximum power point tracking circuit 9 in the at least one maximum power point tracking circuit 9 electrically connects the first switch pole and the second switch pole corresponding to two photovoltaic components 8, for ease of understanding, the two first switch poles connected to one end of the maximum power point tracking circuit 9 are switch poles C3 and C4, and the two second switch poles connected to the other end of the maximum power point tracking circuit 9 are switch poles C5 and C6. If along the second direction B, the switch poles C3 and C4 are ranked first and second in the switch unit 3 where they are located, then the switch poles C5 and C6 are also ranked first and third in the switch unit 3 where they are located; if along the second direction B, the switch poles C3 and C4 are ranked first and third in the switch unit 3 where they are located, then the switch poles C5 and C6 are also ranked first and third in the switch unit 3 where they are located. In this solution, the lengths of each circuit can be made the same or close, which is conducive to ensuring the synchronization of the circuits. Of course, in other embodiments, the order of the switch poles 311 connected to one end of the maximum power point tracking circuit 9 in the switch unit 3 where the switch poles 311 themselves are located may be different from the order of the switch poles 311 connected to the other end of the maximum power point tracking circuit 9 in the switch unit 33 where the switch poles 311 themselves are located, and no specific examples are given here.

[0048] Fig.10 A schematic diagram of the structure of a power converter provided in this application is shown in FIG. Fig.11 This is a schematic diagram of another power converter provided in the present application. It is worth noting that only a part of the box 5 is shown in both figures. Fig.10 and Fig.11 As shown, a power converter provided by the present application includes a box 5, the box 5 has a receiving cavity, the driving shaft 1 of the rotary switch, the electrical isolation component 2 and each switch unit 3 are all located in the receiving cavity of the box 5, and the handle 41 of the operating mechanism 4 is exposed from the box 5. Further, a plurality of positive terminals 6 and a plurality of negative terminals 7 are all fixed to the side wall of the box 5, and each positive terminal 6 and each negative terminal 7 are at least partially exposed from the box 5 so as to be connected to the corresponding photovoltaic component 8.

[0049] In specific implementation, in some embodiments, the switch pole 311 can be connected to the corresponding positive terminal 6 or negative terminal 7 through a flexible electrical connector. For example, the flexible electrical connector can be a wire or a copper sheet. A circuit board 100 can also be fixed in the box 5, so that one end of each flexible connector is connected to the corresponding switch pole 311, and the other end of each flexible connector is connected to the circuit board 100, and each positive terminal 6 and negative terminal 7 are also connected to the circuit board 100, so as to achieve a highly compact structure, reduce the volume of the photovoltaic inverter, improve the manufacturing efficiency of the photovoltaic inverter, and reduce the cost. For example, the circuit board 100 can be a printed circuit board (PCB), and the circuit board 100 can be fixed in the box 5 of the photovoltaic inverter by screws or welding.

[0050] It is worth noting that the application scenarios of the photovoltaic inverter provided in this application include but are not limited to string inverters and the DC side of centralized photovoltaic power generation.

[0051] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A power converter, characterized in that: A rotary switch, a plurality of positive terminals and a plurality of negative terminals, wherein the rotary switch comprises a drive shaft, an electrical isolation assembly and at least one pair of switch units; Each pair of the switch units comprises a first switch unit and a second switch unit disposed adjacent to the drive shaft, the first switch unit and the second switch unit each comprising a plurality of switch poles, each of the switch poles being sequentially disposed on the drive shaft along the axial direction of the drive shaft; the plurality of positive terminals are connected to the plurality of switch poles of the first switch unit in a one-to-one correspondence, and the plurality of positive terminals are also used to be connected to the positive poles of the plurality of photovoltaic modules in a one-to-one correspondence; the plurality of negative terminals are connected to the plurality of switch poles of the second switch unit in a one-to-one correspondence, and the plurality of negative terminals are also used to be connected to the negative poles of the plurality of photovoltaic modules in a one-to-one correspondence; Each of the switch poles comprises a switch assembly and a first insulating shell, wherein the switch assembly is disposed in the first insulating shell, and the switch assembly has a contact point exposed from the first insulating shell, and the contact point is used to be electrically connected to the corresponding positive terminal or the negative terminal; The driving shaft is rotatably connected to each of the first insulating housings, the switch assembly comprises a moving contact and a stationary contact, the moving contact is relatively fixed to the driving shaft, and the moving contact of each of the switch assemblies is synchronously in contact with or separated from the stationary contact of each of the switch assemblies in response to the rotation of the driving shaft; In the rotary switch, the electrical isolation component is provided between the adjacent first switch unit and the second switch unit, and at least part of the electrical isolation component is located between the first contact point and the second contact point. The first contact point and the second contact point are the contact points of the two adjacent switch poles between the first switch unit and the second switch unit.

2. The power converter according to claim 1, characterized in that The electrical isolation component is rotatably disposed on the driving shaft, and the electrical isolation component is fixedly connected to the first insulating housings of the two switch poles adjacent to the electrical isolation component.

3. The power converter according to claim 2, characterized in that: The electrical isolation component protrudes from a first surface of each of the first insulating shells, and the first surface is a surface where a contact point of the insulating shell is located.

4. The power converter according to claim 3, characterized in that: Each of the first insulating housings has an insulating partition protruding from the first surface, each of the insulating partitions extending along a first direction and isolating the contact points of two adjacent switch poles between the first switch unit and the second switch unit, the first direction being perpendicular to the axial direction of the drive shaft and parallel to the first surface; The electrical isolation component is fixed on the insulating partition of the first insulating housing of any one of the two adjacent switch poles in the first switch unit and the second switch unit.

5. The power converter according to claim 4, characterized in that: In a direction away from the first surface, the electrical isolation component is a plate-like structure, and the plate-like structure includes a second surface and a third surface opposite to each other along the axial direction of the drive shaft; The second surface and the third surface extend in a direction away from the first surface, and the distance between the second surface and the third surface gradually decreases as the distance from the first surface increases.

6. The power converter according to claim 5, characterized in that The material of the electrical isolation component is rubber.

7. The power converter according to claim 1, characterized in that: The electrical isolation component includes an insulating plate or an insulating box having a receiving cavity.

8. The power converter according to claim 1, characterized in that: The rotary switch also includes an operating mechanism, which is located at one end of the drive shaft and connected to the drive shaft, and is used to drive each of the switch poles to synchronously switch between closing and opening through the drive shaft.

9. The power converter according to claim 1, characterized in that: including at least one maximum power point tracking circuit and an inverter circuit; The switch pole in the first switch unit is a first switch pole, the switch pole in the second switch unit is a second switch pole, the positive input end of each of the maximum power point tracking circuits is electrically connected to at least one of the first switch poles, the negative input end of each of the maximum power point tracking circuits is electrically connected to at least one of the second switch poles, and the output end of the maximum power point tracking circuit is used to connect the inverter circuit.

10. The power converter according to claim 9, characterized in that: Taking the direction in which the first switch pole points to the second switch pole as the second direction, along the second direction, the order of the first switch pole electrically connected to the positive input end of the maximum power point tracking circuit in the first switch unit where the first switch pole is located is the same as the order of the second switch pole electrically connected to the negative input end of the same maximum power point tracking circuit in the second switch unit where the second switch pole is located.

11. A power converter, characterized in that: The invention comprises a rotary switch, a plurality of positive terminals and a plurality of negative terminals, wherein the rotary switch comprises a drive shaft, an operating mechanism and at least one pair of switch units; Each pair of the switch units includes a first switch unit and a second switch unit disposed adjacent to the drive shaft, the first switch unit and the second switch unit each including a plurality of switch poles, each of the switch poles being sequentially disposed on the drive shaft along the axial direction of the drive shaft; the plurality of positive terminals are connected to the plurality of switch poles of the first switch unit in a one-to-one correspondence, and the plurality of positive terminals are also used to be connected to the positive poles of the plurality of photovoltaic modules in a one-to-one correspondence; the plurality of negative terminals are connected to the plurality of switch poles of the second switch unit in a one-to-one correspondence, and the plurality of negative terminals are also used to be connected to the negative poles of the plurality of photovoltaic modules; Each of the switch poles comprises a switch assembly and a first insulating shell, wherein the switch assembly is disposed in the first insulating shell, and the switch assembly has a contact point exposed from the first insulating shell; The driving shaft is rotatably connected to each of the first insulating housings, the switch assembly comprises a moving contact and a stationary contact, the moving contact is relatively fixed to the driving shaft, and the moving contact of each of the switch assemblies is synchronously in contact with or separated from the stationary contact of each of the switch assemblies in response to the rotation of the driving shaft; The operating mechanism is connected to the drive shaft, and is used to drive the switch pole to synchronously switch between closing and opening through the drive shaft; wherein the operating mechanism includes a second insulating shell, and the operating mechanism is located between a pair of adjacent first switch units and the second switch units.

12. The power converter according to claim 11, characterized in that The rotary switch includes a plurality of pairs of switch units sequentially arranged on the drive shaft, wherein the first switch unit in each pair of switch units is located on one side of the operating mechanism, and the second switch unit in each pair of switch units is located on one side of the operating mechanism.

13. The power converter according to claim 12, characterized in that: Along the axial direction of the driving shaft, the number of switch poles located on both sides of the operating mechanism is the same.

14. The power converter according to claim 11, characterized in that: including at least one maximum power point tracking circuit and an inverter circuit; The switch pole in the first switch unit is a first switch pole, the switch pole in the second switch unit is a second switch pole, the positive input end of each of the maximum power point tracking circuits is electrically connected to at least one of the first switch poles, the negative input end of each of the maximum power point tracking circuits is electrically connected to at least one of the second switch poles, and the output end of the maximum power point tracking circuit is used to connect the inverter circuit.

15. The power converter according to claim 14, characterized in that Taking the direction in which the first switch pole points to the second switch pole as the second direction, along the second direction, the order of the first switch pole electrically connected to the positive input end of the maximum power point tracking circuit in the first switch unit where the first switch pole is located is the same as the order of the second switch pole electrically connected to the negative input end of the same maximum power point tracking circuit in the second switch unit where the second switch pole is located.

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