Power mechanisms, switches, power conversion devices and power supply systems

Abstract

The embodiments of the present application provide a power mechanism, a switch, a power conversion device and a power supply system. The switch includes a contact assembly, a knob and a power mechanism connected between the contact assembly and the knob. The power mechanism includes a fixed frame, a knob connector, a contact connector, a transmission assembly, a tripper and a tripper. The knob connector and the contact connector are both rotatably connected to the fixed frame and their rotation centers are collinear. The transmission assembly is used to realize power transmission between the knob connector and the contact connector. The tripper is used to receive the tripping signal to realize the tripping of the tripper and the tripper. The tripper drives the transmission assembly to move so that the moving contact is separated from the static contact, thereby tripping the switch. The switch provided by the present application has the advantages of compact structure and small size.

Description

[0001] This application is a divisional application. The application number of the original application is 202210295906.5, and the original application date is March 24, 2022. The entire content of the original application is incorporated into this application by reference. Technical Field

[0002] The present application relates to the technical field of power supply systems, and in particular to a power mechanism, a switch, a power conversion device and a power supply system used in a switch of a power supply system. Background Art

[0003] Switches are widely used in power supply systems, controlling the opening and closing of circuits. As power supply systems gain increasing functionality and safety demands, switches are increasingly used in electronic devices such as power converters to manually open and close circuits or automatically trip circuits. Designing compact, small-sized switches is a key area of ​​research and development in power supply systems. Summary of the Invention

[0004] The embodiments of the present application provide a power mechanism, a switch, a power conversion device, and a power supply system. The design of the power mechanism of the switch is easy to achieve a small size, which can save space in electronic equipment.

[0005] In a first aspect, an embodiment of the present application provides a power supply system, comprising a control unit, a switch, a DC source and a power change unit, wherein the switch is electrically connected between the DC source and the power change unit, and the control unit is used to send a trip signal to the switch when the DC source or the power change unit fails. The switch comprises a contact assembly, a knob and a power mechanism connected between the contact assembly and the knob, wherein the contact assembly comprises a moving contact and a static contact capable of relatively closing or opening the switch; the power mechanism comprises a fixing frame, a knob connector, a contact connector, a transmission assembly, a tripper and a tripping member, and the knob connector is fixedly connected to the contact assembly. The knob is connected, and the contact connector is fixedly connected to the moving contact. The knob connector and the contact connector are both rotatably connected to the fixed frame and the rotation centers of the two are collinear. The transmission assembly is used to realize power transmission between the knob connector and the contact connector. The jumper is rotatably connected to the fixed frame, and the jumper is connected to the transmission assembly. The jumper cooperates with the release, and the release is used to receive the tripping signal to realize the tripping of the release and the tripper, and the transmission assembly is driven to move by the jumper to separate the moving contact from the static contact, thereby opening the switch.

[0006] In this application, the knob connector and the contact connector are both rotated to the fixed frame and the rotation centers of the two are collinear, so that the overall structure of the power mechanism can be compact and space-saving, which is conducive to the small-size design of the switch and saves space in the power supply system.

[0007] In one possible embodiment, the transmission assembly includes a first linkage structure, a second linkage structure, and a transmission member, wherein the transmission member is rotatably connected to the fixed frame, the first linkage structure is connected between the transmission member and the knob connector to achieve rotation of the transmission member relative to the fixed frame by rotating the knob, and the second linkage structure is connected between the transmission member and the contact connector to achieve movement of the moving contact by rotating the transmission member relative to the fixed frame. This solution provides a specific architecture of a transmission assembly, which realizes the opening and closing of the switch by using the independent first linkage structure and the second linkage structure as the transmission structure between the knob and the transmission member and the transmission member and the moving contact, respectively. The structural design is simple, compact, and easy to operate.

[0008] In one possible embodiment, the fixing frame includes a frame body and a main shaft fixed to the frame body, the knob connector is rotatably connected to one end of the main shaft, and the contact connector is rotatably connected to the other end of the main shaft. In the axial direction of the main shaft, the contact connector, the frame body and the knob connector are arranged in sequence, and the rotation center of the knob connector and the rotation center of the contact connector are both located on the central axis of the main shaft.

[0009] Due to the coaxial and collinear design of the knob connector and the contact connector of the power mechanism, the first linkage structure and the second linkage structure are assembled on the same rotating shaft, and the knob connector and the contact connector are also assembled on the same rotating shaft. Such a design makes the overall structural design of the power mechanism more compact, and the power mechanism can be arranged in a smaller space, which is conducive to the miniaturization design of the switch. On the other hand, the switch provided by the present application is safer. Specifically, when welding occurs between the moving contact and the static contact, during the normal manual opening process, the knob is rotated to a preset position and cannot drive the moving contact to move. In this case, the knob can be continued to be rotated so that the first rotating structure of the first linkage structure contacts and pushes against the second rotating structure of the second linkage structure. Through the holding force between the first rotating structure and the second rotating structure (this holding force is greater than the connection force generated by the welding between the moving contact and the static contact), the moving contact can be forced to leave the static contact to achieve opening.

[0010] In one possible embodiment, the frame includes a first plate and a second plate disposed opposite each other, the main shaft passing through the first and second plates, the knob connector rotatably connected to one end of the main shaft, and the contact connector rotatably connected to the other end of the main shaft; a portion of the first linkage structure is located between the first and second plates, sleeved around the periphery of the main shaft, rotatably connected to the fixed frame, and fixedly connected to the knob connector. This solution coaxially assembles the knob connector, contact connector, and portion of the first linkage structure via the main shaft, thereby achieving a simple and compact overall structure of the power mechanism.

[0011] In one possible embodiment, the first linkage structure includes a first rotating structure, which includes a first part and a second part that are relatively spaced and fixedly connected to each other, the first part being sleeved on the periphery of the main shaft and adjacent to the first plate, the first part being fixedly connected to the knob connector, the second part being sleeved on the periphery of the main shaft and adjacent to the second plate, and the area between the first part and the second part being used to accommodate part of the second linkage structure; the first rotating structure and the transmission member are movably connected to achieve rotation of the transmission member relative to the fixed frame by rotating the knob. This solution achieves force transmission between the transmission member and the knob shaft through the movably connected first rotating structure and the transmission member, and the first rotating structure of the first linkage structure is designed as the first part and the second part, and the two parts are both rotatably connected to the main shaft, which is conducive to the compact structure of the transmission assembly and has the advantage of saving space.

[0012] In one possible embodiment, the first linkage structure includes a first connecting rod structure, and the first rotating structure is movably connected to the transmission member via the first connecting rod structure. One end of the first connecting rod structure is rotationally connected to the first rotating structure, and the other end is rotationally connected to the transmission member. This solution realizes the connection between the knob connector and the transmission member by connecting the first connecting rod structure, the first rotating structure, and the transmission member, which has the advantages of space saving and stable movement.

[0013] In one possible embodiment, the transmission member includes a first arm, a second arm, and an intermediate arm, the first arm and the second arm are relatively spaced apart, the intermediate arm is fixedly connected between the first arm and the second arm, the first arm is rotationally connected to the first plate, the second arm is rotationally connected to the second plate, and the intermediate arm is used to connect the second linkage structure through an elastic member; the first connecting rod structure includes a first rod and a second rod, the first rod and the second rod are relatively spaced apart and fixedly connected, one end of the first rod is rotationally connected to the first part, and the other end is rotationally connected to the first arm, one end of the second rod is rotationally connected to the second part, and the other end is rotationally connected to the second arm. This solution limits the specific architecture of the first connecting rod structure, transmits the force of the first rotating structure to the first arm through the first rod, and transmits the force of the first rotating structure to the second arm through the second rod. For the transmission member, the first arm and the second arm simultaneously receive the thrust of the first linkage structure, which has the advantages of balanced force and good stability.

[0014] In one possible embodiment, the first arm includes a first main arm and a first branch arm, the first main arm being rotatably connected to the first plate, one end of the first branch arm being fixedly connected to the first main arm and the other end being rotatably connected to the first rod, and the second arm including a second main arm and a second branch arm, the second main arm being rotatably connected to the second plate, one end of the second branch arm being fixedly connected to the second main arm and the other end being rotatably connected to the second rod, the first branch arm being located outside the first plate, and the second branch arm being located outside the second plate. This solution defines the specific architecture of the first and second arms of the transmission member, and on the basis of balanced force, this solution facilitates a compact design.

[0015] In one possible embodiment, the portion of the first main arm pivotally connected to the first plate is located on the inner side of the first plate, and the portion of the second main arm pivotally connected to the second plate is located on the inner side of the second plate. By defining the positions of the pivotal connections of the first and second main arms relative to the first and second plates as being related, this solution allows the connection structure between the transmission member and the fixed frame to be compact and space-saving.

[0016] In one possible embodiment, the transmission member includes a first arm, a second arm, and an intermediate arm, wherein the first arm and the second arm are relatively spaced apart, the intermediate arm is fixedly connected between the first arm and the second arm, the first arm is rotationally connected to the first plate, the second arm is rotationally connected to the second plate, and the intermediate arm is used to rotationally connect to the first linkage structure. By connecting the intermediate arm to the first connecting rod structure, there is no need to set a connecting structure on the first arm and the second arm, so that the overall structure of the power mechanism is compact and the size can be designed to be smaller. Moreover, the stress on the intermediate arm also makes it easy to achieve the reliability of the transmission member structure. For example, the size and shape of the intermediate arm can be controlled to ensure the reliability of the connection between the transmission member and the first connecting rod structure.

[0017] In one possible embodiment, the intermediate arm includes an intermediate body and an intermediate connecting rod, which are fixedly connected to form an integral structure. An end of the intermediate connecting rod, distal from the intermediate body, is rotatably connected to the first connecting rod structure. This solution defines the specific structure of the intermediate arm. The intermediate connecting rod may be a thinner rod-shaped structure relative to the intermediate body and may be located in the center of a perpendicular line connecting the first plates.

[0018] In one possible embodiment, a portion of the second linkage structure is located between the first plate and the second plate, and between the first portion and the second portion, and is rotationally connected to the main shaft and fixedly connected to the contact connector. This solution defines the specific positional relationship between the portion of the second linkage structure and the first and second portions of the first rotating structure on the main shaft, allowing both the first and second linkage structures to be assembled on the main shaft. This not only facilitates assembly, simplifies the assembly process, and ensures accuracy, but also allows for a compact overall structure of the power mechanism, facilitating a small-scale design.

[0019] In one possible embodiment, the second linkage structure includes a second rotating structure and a second connecting rod structure, the second rotating structure includes an intermediate sleeve and a first protrusion and a second protrusion protruding from the outer surface of the intermediate sleeve, the intermediate sleeve is sleeved on the main shaft and is located between the first part and the second part, the first protrusion and the contact connector are fixedly connected by a fixing pin, the fixing pin and the outer surface of the second part of the first rotating structure are spaced apart, the outer surface is the surface of the second part away from the main shaft in the radial direction of the main shaft, the second protrusion is rotatably connected to one end of the second connecting rod structure, the second connecting rod structure is located between the first plate and the second plate and is used to connect the transmission member. This solution defines a specific solution for the second linkage structure. By setting the position of the fixing pin, on the one hand, it can ensure that the first linkage structure and the second linkage structure can move independently of each other. On the other hand, it can also apply force to the second rotation structure of the second linkage structure by rotating the first rotation structure of the first linkage structure, so that when welding occurs between the moving contact and the static contact, the knob can be continued to be rotated so that the first rotation structure of the first linkage structure contacts and pushes against the second rotation structure of the second linkage structure. Through the holding force between the first rotation structure and the second rotation structure (this holding force is greater than the connection force generated by the welding between the moving contact and the static contact), the moving contact can be forced to leave the static contact to achieve opening.

[0020] In one possible embodiment, the first rotating structure and the transmission member are slidably connected to each other, so that rotation of the knob drives the transmission member to rotate relative to the fixed frame. This solution achieves the advantages of a compact structure and small size by transmitting force between the first rotating structure and the transmission member through a sliding connection.

[0021] In one possible embodiment, the transmission member includes a first arm, a first extension, a second arm, a second extension, and an intermediate arm, the first arm and the second arm are relatively spaced apart, the intermediate arm is fixedly connected between the first arm and the second arm, the first arm is rotationally connected to the first plate, the second arm is rotationally connected to the second plate, the intermediate arm is used to connect the second linkage structure through an elastic member, one end of the first extension is fixedly connected to the first arm, the other end of the first extension is located on the side of the first part of the first rotating structure away from the second part, and is slidingly connected to the first rotating structure, one end of the second extension is fixedly connected to the second arm, the other end is located on the side of the second part of the first rotating structure away from the first part, and is slidingly connected to the second rotating structure. This solution defines a specific structural design scheme for a slidingly connected transmission member, the structure of the first linkage structure is simple, and the force transmission between the first rotating structure and the transmission member can be achieved only through sliding fit, which has the advantage of a compact structure.

[0022] In one possible embodiment, the first rotating structure includes a sliding rod, which fixedly connects the first part and the second part, and the sliding rod includes a first sliding portion and a second sliding portion, the first sliding portion is located on the side of the first part away from the second part, and the second sliding portion is located on the side of the second part away from the first part, the first extension portion is provided with a first slide groove, the first slide groove and the first sliding portion cooperate, the second extension portion is provided with a second slide groove, the second slide groove and the second sliding portion cooperate to achieve a sliding connection between the first rotating structure and the transmission member. This solution defines a specific sliding connection solution. Through the cooperation of the sliding rod and the slide groove, the shape of the slide groove can be designed as needed to limit the sliding trajectory of the sliding rod in the slide groove. The structural design of this solution also has the advantage of a compact structure.

[0023] In one possible implementation, the switch has three states: manual opening, manual closing, and automatic tripping. When the switch is in the manual closing state, the knob points to a first position. When the switch is in the manual opening state, the knob points to a second position. When the switch is in the automatic tripping state, the knob points to a third position. The angle at which the knob rotates between the third position and the first position is greater than or equal to a preset value, and the angle at which the knob rotates between the third position and the second position is also greater than or equal to a preset value. This solution, by limiting the knob's indication to a large angle, facilitates identification and observation of the switch state, making it easier to detect problems such as slight contact welding and opening failure.

[0024] Specifically, the preset value may be greater than or equal to 20 degrees, or greater than or equal to 30 degrees. In a specific implementation, the preset value is between 40 degrees and 50 degrees.

[0025] In a second aspect, an embodiment of the present application provides a power mechanism applied to a switch, for driving the moving contact and the static contact of the switch to close or open, the power mechanism comprising a fixed frame, a knob connector, a contact connector, a transmission member, a first linkage structure, and a second linkage structure. The knob connector, the contact connector, and the transmission member are all rotatably connected to the fixed frame, the knob connector is used to fix the knob, the contact connector is used to fix the moving contact, the rotation center of the knob connector is the first axis, the rotation center of the contact connector is the second axis, and the first axis and the second axis are collinear; the first linkage structure is connected between the transmission member and the knob connector to realize the rotation of the transmission member relative to the fixed frame by rotating the knob; the second linkage structure is connected between the transmission member and the contact connector to realize the movement of the moving contact by the rotation of the transmission member relative to the fixed frame.

[0026] In one possible embodiment, the fixing frame includes a frame body and a main shaft fixed to the frame body, the knob connector is rotatably connected to one end of the main shaft, and the contact connector is rotatably connected to the other end of the main shaft. In the axial direction of the main shaft, the contact connector, the frame body and the knob connector are arranged in sequence, and the first axis and the second axis are both located on the central axis of the main shaft.

[0027] The power mechanism provided by the present application has the advantages of a compact structure and a small size. Specifically, due to the coaxial and collinear design of the knob connector and the contact connector of the power mechanism, the first linkage structure and the second linkage structure are assembled on the same rotating shaft, and the knob connector and the contact connector are also assembled on the same rotating shaft. This design makes the overall structure of the power mechanism more compact, allowing the power mechanism to be arranged in a smaller space, which is conducive to the miniaturization of the switch.

[0028] On the other hand, the power mechanism solution provided in the present application makes the switch safer. Specifically, when welding occurs between the moving contact and the static contact, during the normal manual opening process, the knob cannot drive the moving contact to move when rotated to the preset position. In this case, the knob can continue to be rotated so that the first rotating structure of the first linkage structure contacts and pushes against the second rotating structure of the second linkage structure. Through the holding force between the first rotating structure and the second rotating structure (this holding force is greater than the connection force generated by the welding between the moving contact and the static contact), the moving contact can be forced to leave the static contact to achieve opening.

[0029] For other possible implementations of the second aspect, please refer to the various possible implementations of the first aspect.

[0030] In a third aspect, an embodiment of the present application provides a switch, comprising a contact assembly, a knob, and a power mechanism described in any possible embodiment described in the first aspect, wherein the contact assembly comprises a moving contact and a static contact, and the power mechanism is connected between the knob and the moving contact, and is used to drive the moving contact and the static contact to close or open.

[0031] In a fourth aspect, an embodiment of the present application provides a power conversion device, comprising a circuit board and the switch described in the third aspect, wherein the contact assembly is provided on the circuit board.

[0032] In a fifth aspect, an embodiment of the present application provides a power supply system, comprising a DC source, a power changing unit and the switch described in the third aspect, wherein the switch is connected between the DC source and the power changing unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0034] Figure 1 is a schematic diagram of a power supply system provided in one embodiment of the present application;

[0035] Figure 2 is a schematic diagram of a power conversion device provided in one embodiment of the present application;

[0036] Figure 3 is a schematic diagram of a switch provided in one embodiment of the present application;

[0037] Figure 4 This is an exploded view of a switch provided in one embodiment of the present application;

[0038] Figure 5 is a schematic diagram of a switch knob provided in one embodiment of the present application;

[0039] Figure 6 This is a schematic diagram of a switch knob and an outer surface of a housing of a power conversion device provided in one embodiment of the present application;

[0040] Figure 7 is a schematic diagram of a contact assembly of a switch provided in one embodiment of the present application;

[0041] Figure 8 This is an exploded view of a contact unit in a contact assembly of a switch provided in one embodiment of the present application;

[0042] Figure 9is a cross-sectional schematic diagram of a contact assembly of a switch provided in one embodiment of the present application;

[0043] Figure 10 This is a partial cross-sectional schematic diagram of a movable contact and a stationary contact in a contact assembly of a switch provided in one embodiment of the present application in a closed state;

[0044] Figure 11 This is a partial cross-sectional schematic diagram of a movable contact and a stationary contact in a contact assembly of a switch provided in one embodiment of the present application in an open state;

[0045] Figure 12 is a schematic diagram of a power mechanism of a switch provided in one embodiment of the present application;

[0046] Figure 13 This is a schematic diagram of a power mechanism of a switch provided in one embodiment of the present application from another direction;

[0047] Figure 14 and Figure 15 1 is a perspective schematic diagram of the linkage device of the power mechanism provided by the first embodiment in two directions;

[0048] Figure 16 is a cross-sectional view of the linkage device of the power mechanism provided in the first embodiment;

[0049] Figure 17 and Figure 18 1 is an exploded view of the linkage device of the power mechanism provided in the first embodiment in two directions;

[0050] Figure 19 This is a schematic diagram of a switch provided in one embodiment of the present application, a schematic diagram of the switch in a closed state (the movable contact and the stationary contact are in a closed state);

[0051] Figure 20 This is a schematic diagram of a switch provided in one embodiment of the present application, and a schematic diagram of the dead point position of the switch during the opening process;

[0052] Figure 21 This is a schematic diagram of a switch provided in one embodiment of the present application, and a schematic diagram of the switch in an open state;

[0053] Figure 22 This is a schematic diagram of a switch provided in one embodiment of the present application, and a schematic diagram of the switch in a certain position during manual closing;

[0054] Figure 23 and Figure 24 This is a schematic diagram of a switch provided in one embodiment of the present application, and a schematic diagram of the switch in a free tripping state;

[0055] Figure 25 Schematic diagram of the transmission member and the first linkage structure in the power mechanism for picking up goods in the second embodiment of the present application;

[0056] Figure 26 and Figure 27 It is a schematic diagram of the transmission parts and the first linkage structure in the power mechanism for picking up goods in the third embodiment of the present application. DETAILED DESCRIPTION

[0057] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

[0058] See Figure 1 , the specific embodiment of the present application provides a power supply system and a switch used in the power supply system. The power supply system includes a control unit, a switch, a DC source and a power change unit, the switch is electrically connected between the DC source and the power change unit, and the control unit is used to send a trip signal to the switch when the DC source or the power change unit fails. The DC source can be a photovoltaic component, or a photovoltaic string, or a series-parallel circuit of a photovoltaic component and a photovoltaic string, and the DC source can also be a power conversion unit. The power conversion unit can be a DC / DC converter or a DC / AC converter. Both the DC source and the power conversion unit can be regarded as power supply circuits. When the power supply circuit fails, for example, if the DC source or the power conversion unit fails, the control unit detects the occurrence of this fault, and the control unit can send a trip signal to the switch. This trip signal is used to trigger (i.e. drive) the switch to open and disconnect the circuit.

[0059] In one embodiment, the control unit may be a separate controller that is provided in the power supply system independently of the DC source and the power conversion unit, and is electrically connected to the power conversion unit, the DC source, and the switch via a signal line. In one embodiment, the power conversion unit may be an independent power conversion device, such as an inverter. In one embodiment, the control unit may also be integrated into other functional devices. For example, the control unit may be integrated into the inverter, and may be a control circuit or control chip on the mainboard of the inverter. In this way, the power conversion device, as an independent device, can have a free tripping function when used in any scenario, that is, it can automatically trip in the event of a circuit failure.

[0060] The switch provided in this application can be an independent switch device set in the power supply system, or it can be set on a functional device in the power supply system. For example, in one embodiment, the switch is set on a power conversion device. Figure 2As shown, the power conversion device 100 includes a housing 1, a switch 2, and a circuit board 3. The housing 1 encloses a receiving space 11, and the circuit board 3 is disposed in the receiving space 11. The switch 2 includes a knob 21, a power mechanism 22, and a contact assembly 23. The contact assembly 23 and the power mechanism 22 are located in the receiving space and are electrically connected to the circuit board 3. The knob 21 is located on one side of the outer surface of the housing 1. In one embodiment, a control unit 31 is provided on the circuit board 3. The control unit 31 is electrically connected to the power mechanism 22 and is configured to send a trip signal to the power mechanism 22, so that the power mechanism 22 can drive the contact assembly 23 to open the switch.

[0061] Figure 3 This is a three-dimensional schematic diagram of a switch 2 provided in one embodiment of the present application. Figure 4 This is an exploded view of a switch 2 provided in one embodiment of the present application. Figure 3 and Figure 4 The switch 2 includes a knob 21, a power mechanism 22, and a contact assembly 23. The power mechanism 22 is stacked between the knob 21 and the contact assembly 23 along the first direction A. The power mechanism 22 includes a cover body 4 and a linkage device 5 housed in the cover body 4. The cover body 4 includes an upper cover 41 and a lower cover 42. The upper cover 41 and the lower cover 42 are interlocked and together surround the linkage device 5. The linkage device 5 includes a knob connector S1 and a contact connector S2. In one embodiment, the knob connector S1 extends from the upper cover 41 to the cover body 4, and the knob connector S1 is used to fix the knob 21. In other embodiments, the knob connector S1 can also be located inside the cover body 4 and does not extend out of the cover body 4. The knob 21 extends from the outside of the cover body 4 into the cover body 4 and is fixedly connected to the knob connector S1. The knob connector S1 can rotate relative to the cover body 4, and the axial extension direction of the knob connector S1 is the first direction A. In one embodiment, the contact connector S2 extends from the lower cover 42 to the cover body 4, and the contact connector S2 is used to fix the contact assembly 23. In other embodiments, the contact connector S2 can also be located inside the cover body 4, not extending from the cover body 4, and the contact assembly 23 extends into the cover body 4 and is fixedly connected to the contact connector S2. The extension direction of the rotation center of the contact connector S2 is the first direction A. The rotation center of the knob connector S1 and the rotation center of the contact connector S2 are collinear. The knob connector S1 and the contact connector S2 are assembled on the same axis, and the two are coaxially arranged. Figure 2 and Figure 4 When the switch 2 is assembled in the housing 1 of the power conversion device 100, the power mechanism 22 and the contact assembly 23 are housed within the housing 1. The surface of the power mechanism 22 facing away from the contact assembly 23 can contact the inner surface of the housing 1. The housing 1 has a through hole through which the knob connector S1 on the power mechanism 22 extends. The knob 21 is mounted on the knob connector S1 from one side of the outer surface of the housing 1.

[0062] In the specific implementation of the present application, the extension direction of the contact connector S2 and the knob connector S1 is the same, and the rotation centers of the two are coaxial and collinear. By rotating the knob to drive the contact connector to rotate, the rotation direction of the knob and the rotation direction of the contact connector can be designed to be the same. Since the moving contact is inside the device and cannot be observed with the naked eye, the present application can intuitively understand the rotation direction of the moving contact through the knob during the operation of the knob connector, which can provide a better user experience. Moreover, the design of the coaxial and collinear rotation centers of the contact connector S2 and the knob connector S1 makes the structure of the power mechanism 22 between the knob and the moving contact compact, making it easy to achieve a small-size design of the switch.

[0063] See also Figure 3 and Figure 5 In one embodiment, the knob 21 includes a handle 211 and a base 212. The base 212 is used to connect the power mechanism 22 and the knob connector S1. The handle 211 is connected to the side of the base 212 away from the cover 4 of the power mechanism 22. The handle 211 is used to provide manual operation for the user and to indicate the state of the switch (closed state, open state, fault state). Figure 5 As shown, the base 212 has a mounting hole 213 defined on the surface facing the power mechanism 22. The knob connector S1 of the power mechanism 22 extends out of the housing of the power converter and is secured to this mounting hole 213. The mounting hole 213 is located at the center of the base 212. The base 212 may be in the shape of an oblate cylinder. The first direction A represents the axial direction of the base 212. The handle 211 extends in a strip-like shape along the radial direction of the base 212 and extends beyond the outer edge of the base 212.

[0064] In one embodiment, the rotation angle of the knob 21 is 90 degrees, which is consistent with conventional operating habits and can provide users with a good experience. Figure 6As shown, in one embodiment, three positions are set around the knob 21 on one side of the outer surface of the housing 1 of the power conversion device, namely the first position P1, the second position P2, and the third position P3. With the center position of the base 212 as the center of the circle, the radial direction at the first position P1 and the radial direction at the second position P2 are at an angle of 90 degrees, and the third position P3 is between the first position P1 and the second position P2. When the switch is in the manual closing state, the knob 21 is in the first position P1 (specifically, in this state, the edge of the handle 211 points to the first position P1); when the switch is in the manual opening state, the knob 21 is in the second position P2 (specifically, in this state, the edge of the handle 211 points to the second position P2); when a circuit fault occurs, the switch is in the tripped state, at which time the knob is in the third position P3 (specifically, in this state, the edge of the handle 211 points to the third position P3). Specifically, the outer surface of the handle 211 may be provided with arrow-like markings, and the specific state of the switch is indicated by the corresponding indication relationship between the arrows and the first position P1, the second position P2, and the third position P3. The angle of rotation of the knob between the first position P1 and the second position P2 is 90 degrees (which can also be understood as close to 90 degrees, and close to 90 degrees can be understood as within a range of approximately 90 degrees, for example, a range of 75 degrees to 105 degrees). The angle of rotation of the knob between the third position P3 and the first position P1 is greater than or equal to a preset value, and the angle of rotation of the knob between the third position P3 and the second position P2 is also greater than or equal to the preset value. The preset value is set to ensure that the third position P3 is easily distinguishable from the first position P1 and from the second position P2 by the naked eye. In other words, when the switch is in a trip state (Trip state), the third position P3 indicated by the knob is easily recognizable. Specifically, this preset value can be greater than or equal to 20 degrees, or greater than or equal to 30 degrees. In one specific embodiment, the preset value is between 40 degrees and 50 degrees. The knob of the switch provided in the present application has a large rotation angle, which makes it easy to identify the specific state of the switch with the naked eye, especially in the automatic tripping state, and also has obvious position identification.

[0065] See Figure 7The contact assembly 23 includes a plurality of contact units 230 stacked along a first direction A. The plurality of contact units 230 are stacked sequentially and joined together to form a single unit. Each contact unit 230 includes a fixed portion 231 and a movable portion 232. The movable portion 232 is rotatably connected to the fixed portion 231. The fixed portion 231 is provided with a stationary contact 233, and the movable portion 232 is provided with a moving contact 234. The movable portion 232 has a central axis X extending along the first direction A. The movable portion 232 is rotatable about the central axis X to close or open the moving contact 234 and the stationary contact 233. In this embodiment, the stationary contact 233 is stationary, while the moving contact 234 is movable. In other embodiments, the moving contact and the stationary contact can also be closed or opened by relative movement. For example, when the moving contact moves, the stationary contact can also move, but there is relative displacement between the moving contact and the stationary contact, and closing or opening is achieved through relative displacement. Therefore, the present application does not limit the static contact to be absolutely static. The static state of the static contact is defined relative to the moving contact. As long as there is a relative displacement between the two, the static contact is allowed to move.

[0066] See Figure 8 , Figure 8 The figure shows an exploded view of a contact unit 230. The fixed portion 231 can be understood as a square base structure. A central through-hole 2311 is provided at the center of the fixed portion 231. The static contact 233 is mounted at the edge of the fixed portion 231. The static contact 233 is fixed to the fixed portion 231 by means of a snap fastener, screw, or other fastening method. In one embodiment, there are two static contacts 233. In the circumferential direction, the two static contacts 233 are symmetrically distributed around the periphery of the central through-hole 2311. The two static contacts 233 are arranged around the periphery of the central through-hole 2311 in a 180-degree rotationally symmetrical distribution. The static contact 233 includes an internal connection portion 2331 facing the center through hole 2311 and an external connection portion 2332 located between the outer edge of the fixed portion 231 and the internal connection portion 2331. The internal connection portion 2331 is a sheet-like structure. The internal connection portion 2331 is used to cooperate with the moving contact 234 to achieve circuit connectivity. The external connection portion 2332 is used to be electrically connected to the circuit board of the power conversion device. Specifically, the external connection portion 2332 is used to connect the wire, one end of the wire is electrically connected to the external connection portion 2332, and the other end is electrically connected to the circuit board.

[0067] The movable portion 232 is rotatably connected to the central through hole 2311 of the fixed portion 231. The movable portion 232 includes a first rotating member 2321 and a second rotating member 2322. The first rotating member 2321 includes a base 23211 and a coupling structure 23212. The movable portion 232 is a centrally symmetrical structure, and the central axis of the movable portion 232 is the central axis of the coupling structure 23212. The coupling structure 23212 is fixedly connected to the base 23211 and protrudes from the surface of the base 23211. The base 23211 is used to cooperate with the central through hole 2311 of the fixed portion 231. The base 23211 is rotatably connected to the fixed portion 231. By matching the radial outer size of the base 23211 with the size of the central through hole 2311, the base 23211 is rotatably installed in the central through hole 2311 and can rotate in the central through hole 2311 with the central axis of the movable portion 232 as the rotation center. On the surface of the base 23211, the direction in which the coupling structure 23212 protrudes and extends is the first direction, and the extension direction of the central axis of the movable part 232 is also the first direction. The coupling structure 23212 in the contact unit 230 adjacent to the power mechanism 22 is used for fixed connection with the contact connector S2 of the power mechanism 22, and the coupling structure 23212 of the other contact units 230 is used for fixed connection with the base 23211 of the adjacent contact unit 230. Specifically, the coupling structure 23212 is provided with a fixing hole 23213, and the fixing hole 23213 is formed inwardly from the end surface of the coupling structure 23212 away from the base 23211, and the fixing hole 23213 is used to cooperate with the contact connector S2 of the power mechanism 22. Figure 9 As shown, the base 23211 is provided with a fixing hole 23214, and the fixing hole 23214 of the base 23211 is recessed from the end surface of the base 23211 away from the coupling structure 23212. The coupling structure 23212 is inserted into the fixing hole 23214 of the base 23211 to achieve a fixed connection between the movable part 232 of two adjacent contact units 230.

[0068] The second rotating member 2322 is fixedly connected to the first rotating member 2321. In one embodiment, a fixed through-hole 23221 is provided at the center of the second rotating member 2322. The second rotating member 2322 is sleeved on the coupling structure 23212 of the first rotating member 2321. The fixed through-hole 23221 and the coupling structure 23212 cooperate to achieve a fixed connection between the first rotating member 2321 and the second rotating member 2322. Specifically, the fixed through-hole 23221 is square, and the coupling structure 23212 is a square column. The second rotating member 2322 has a disc-shaped structure and includes a middle region 23222 and an edge region 23223. The edge region 23223 is arranged around the periphery of the middle region 23222, and the fixed through-hole 23221 is located at the center of the middle region 23222. The middle section 23222 is a plate-like structure, while the edge section 23223 includes a first plate 23224 and a second plate 23225 spaced apart from each other. A gap is formed between the first plate 23224 and the second plate 23225. In the axial direction (first direction) of the second rotating member 2322, the first plate 23224 and the second plate 23225 are stacked and spaced apart. In the radial direction of the second rotating member 2322, the middle section 23222 directly faces the center of the gap between the first plate 23224 and the second plate 23225. A first notch 23226 is defined in the first plate 23224, and a second notch 23227 is defined in the second plate 23225. In the axial direction of the second rotating member 2322, the first notch 23226 and the second notch 23227 face each other. The movable contact 234 is fixedly connected to the surface of the middle section 23222, with portions of the movable contact 234 extending into the first notch 23226 and the second notch 23227. Specifically, the movable contact 234 includes an assembly portion 2341 and a mating portion 2342. The assembly portion 2341 is fixedly connected to the middle region 23222 of the second rotating member 2322. The mating portion 2342 is used to engage or disengage with the internal connection portion 2331 of the stationary contact 233 to achieve closing or opening. In one embodiment, the mating portion 2342 is a structure comprising a pair of clamping plates for clamping the internal connection portion 2331. The pair of clamping plates extend from the first notch 23226 and the second notch 23227, respectively, into the position between the first plate 23224 and the second plate 23225. When the mating portion 2342 clamps the internal connection portion 2331, it elastically deforms, thereby clamping the internal connection portion 2331 of the stationary contact 233 through the elastic force.

[0069] See Figures 10 and 11 , the inner portion of the static contact 233 extends into the gap between the first plate 23224 and the second plate 23225, as shown Figure 10As shown, when the movable portion 232 rotates until the matching portion 2342 of the movable contact 234 meets the inner portion 2331, the matching portion 2342 clamps the inner portion 2331 of the static contact 233, and an electrical connection is formed between the matching portion 2342 and the inner portion 2331. This state is the closed state of the switch. Figure 11 As shown, when the movable part 232 rotates to the point where the mating part 2342 of the moving contact 234 is separated from the internal connecting part 2331 of the static contact 233, the internal connecting part 2331 is between the first plate 23224 and the second plate 23225, and gaps are formed between the two surfaces of the internal connecting part 2331 and the first plate 23224 and the second plate 23225. This state can be the open state of the switch.

[0070] See also Figure 12 and Figure 13 , the cover body 4 of the power mechanism 22 covers the linkage device inside. The upper cover 41 and the lower cover 42 of the cover body 4 are buckled with each other. Specifically, the upper cover 41 and the lower cover 42 can be fixedly connected by fasteners, or they can be fixedly connected by adhesive. In this embodiment, the knob connector S1 of the linkage device 5 extends out of the cover body 4 from the upper cover 41, and the contact connector S2 of the linkage device 5 extends out of the cover body 4 from the lower cover 42. The contact connector S2 is used to fix the movable part 232 of the contact assembly 23. It can also be understood that the contact connector S2 is fixedly connected to the moving contact 234. In this way, the rotation process of the contact connector S2 can drive the moving contact 234 to rotate around the central axis X of the contact assembly 23 (see Figure 7 ).

[0071] The present application provides a variety of different power mechanism structures, and the first embodiment will be described in detail below as the main solution. Figures 14 to 18 A schematic diagram of a power mechanism provided for the first embodiment, wherein: Figure 14 and Figure 15 It is a three-dimensional schematic diagram of the linkage device 5 of the power mechanism provided by the first embodiment in two directions. Figure 16 It is a cross-sectional view of the interlocking device 5 of the power mechanism provided in the first embodiment. Figure 17 and Figure 18 1 and 2 are exploded views of the linkage device 5 of the power mechanism provided in the first embodiment in two directions.

[0072] See Figure 14 、 Figure 15 、 Figure 16 、 Figure 17 and Figure 18In a first specific embodiment, the linkage device 5 of the power mechanism 22 includes a fixed frame 6, a knob connector S1, a contact connector S2, a transmission assembly 7, a release 8 and a tripping member 9. The knob connector S1 is fixedly connected to the knob 21, and the contact connector S2 is used to fix the moving contact in the contact assembly. The knob connector S1 and the contact connector S2 are both rotationally connected to the fixed frame 6 and their rotation centers are collinear. The transmission assembly 7 is used to realize power transmission between the knob connector S1 and the contact connector S2. The tripping member 9 is rotationally connected to the fixed frame 6, the tripping member 9 is connected to the transmission assembly 7, and the tripping member 9 cooperates with the release 8. The cooperation relationship between the tripping member 9 and the release 8 includes a buckled state and a tripped state. When the DC source or power change unit in the power supply system is working normally, the jumper 9 and the release 8 remain in a buckled state. When a fault occurs in the DC source or power conversion unit of the power supply system, the power supply system's control unit sends a trip signal to the switch's trip unit 8. Trip unit 8 receives this trip signal to disconnect the trip unit 8 from the tripping element 9. In the tripped state, the connection between the tripping element 9 and the transmission assembly causes the transmission assembly 7 to move, separating the moving contact from the stationary contact, thereby opening the switch.

[0073] See Figure 17 and Figure 18 In the first embodiment, the fixing frame 6 includes a frame body 61 and a main shaft 62 fixed to the frame body 61. The frame body 61 includes a first plate 611 and a second plate 612 arranged opposite to each other. The first plate 611 and the second plate 612 are spaced apart along the first direction. The first plate 611 is located on the upper cover 41 (see FIG. 4 ). Figure 12 and Figure 13 ) on the inner side, the second plate 612 is located on the lower cover 42 (see Figure 12 and Figure 13 ) on the inner side. The first plate 611 and the second plate 612 are fixedly connected to the cover body 4 (see Figure 12 and Figure 13) inside. In one embodiment, the first plate 611 includes a first area R1, a second area R2 and a third area R3 that are interconnected as a whole. The first area R1 and the second area R2 are jointly arranged to form a gap W. The first area R1 is used to connect the tripper 8, and the second area R2 is used to connect the jumper 9. The third area R3 is located between the first area R1 and the second area R2 and on the side away from the gap W. The third area R3 is used to connect the main shaft 62. The connection position between the first area R1 and the tripper 8 and the connection position between the second area R2 and the jumper 9 are distributed on both sides of the gap W. The gap W includes an open end and a bottom end, and the bottom end is located at the edge position of the connection between the first area R1 and the second area R2. Specifically, the gap W is triangular, and the bottom end of the gap W is located at a corner position of the triangle. A rotational matching structure 6112 is provided at the bottom end of the gap W. The rotational matching structure 6112 is used to be rotatably connected to the transmission member in the transmission assembly 7, and the gap W is used to accommodate part of the transmission member. The rotational matching structure 6112 can be a hole structure or a groove structure. In the first embodiment, the rotational engagement structure 6112 is an arcuate hole structure, which mates with the transmission member through the arcuate surface, providing the advantage of a stable and reliable connection. In other embodiments, the rotational engagement structure 6112 can also be a circular hole structure, where a cylindrical rotating shaft and the circular hole structure mate to achieve a rotational connection between the first plate 611 and the transmission member 73. The first plate 611 and the second plate 612 have the same structure, and the structure of the second plate 612 is not further described.

[0074] See Figure 16 、 Figure 17 and Figure 18 The knob connector S1 is rotatably connected to one end of the main shaft 62, and the contact connector S2 is rotatably connected to the other end of the main shaft 62. In the axial direction of the main shaft 62, the contact connector S2, the frame 61, and the knob connector S1 are arranged in sequence, and the rotation centers of the knob connector S1 and the contact connector S2 are both located on the central axis of the main shaft 62. Specifically, the main shaft 62 passes through the first plate 611 and the second plate 612. The fixed connection between the main shaft 62 and the frame 61 can be achieved through an interference fit between the main shaft 62 and the first plate 611, and between the main shaft 62 and the second plate 612. The main shaft 62 includes a first section 621, a middle section 622 and a second section 623 arranged in sequence. The first section 621 is located on the side of the first plate 611 away from the second plate 612, and the second section 623 is located on the side of the second plate 612 away from the first plate 611. The knob connector S1 is rotatably connected to the first section 621, and the contact connector S2 is rotatably connected to the second section 623. The middle section 622 is located between the first plate 611 and the second plate 612.

[0075] The first plate 611 further includes a first mounting sleeve 6114 protruding toward the second plate 612. The central through-hole of the first mounting sleeve 6114 is configured to accommodate the spindle 62. The first mounting sleeve 6114 is positioned around the periphery of the spindle 62 and is relatively fixedly connected to the spindle 62. Similarly, the second plate 612 includes a second mounting sleeve 6124 protruding toward the first plate 611. The central through-hole of the second mounting sleeve 6124 is configured to accommodate the spindle 62. The second mounting sleeve 6124 is positioned around the periphery of the spindle 62 and is relatively fixedly connected to the spindle 62. The outer surfaces of the first mounting sleeve 6114 and the second mounting sleeve 6124 are both cylindrical.

[0076] See Figure 16 and Figure 18 In the first embodiment, the knob connector S1 includes a first base S11 and a first rod S12. The first rod S12 is fixedly connected to one side of the first base S11. The first rod S12 is used to connect the knob 21. The first rod S12 cooperates with the mounting hole 213 of the base 212 of the knob 21 (see Figure 5 ). The surface of the first base S11 facing away from the first rod S12 is provided with a first middle hole S110 and a first fixing hole S111. The first middle hole S110 is used to cooperate with the main shaft 62, that is, one end of the main shaft 62 is inserted into the first middle hole S110 and fixedly connected to the first base S11. There are two first fixing holes S111, which are distributed on both sides of the first middle hole S110. The first fixing holes S111 are used to connect with the first linkage structure of the transmission assembly 7. The number of first fixing holes S111 can also be one, or three, or more. The central axis of the first rod S12 and the central axis of the first middle hole S110 are collinear, and both of these central axes are collinear with the central axis of the main shaft 62.

[0077] See Figure 16 and Figure 17 In the first embodiment, the contact connector S2 includes a second base S21 and a second rod S22. The second rod S22 is fixedly connected to one side of the second base S21. A second intermediate hole S210 and a second fixing hole S211 are defined on the surface of the second base S21 facing away from the second rod S22. The second intermediate hole S210 is used for fixedly connecting to one end of the main shaft 62, and the second fixing hole S211 is used for fixedly connecting to the second connecting structure of the transmission assembly. There is one second fixing hole S211. The central axis of the second rod S22 and the central axis of the second intermediate hole S210 are collinear, and both central axes are collinear with the central axis of the main shaft 62.

[0078] See Figure 14 、 Figure 15 、 Figure 16 、 Figure 17 and Figure 18The transmission assembly 7 includes a first linkage structure 71, a second linkage structure 72, a transmission member 73 and an elastic member 74. The transmission member 73 is rotatably connected to the fixed frame 6. The first linkage structure 71 is connected between the transmission member 73 and the knob connector S1 to realize the rotation of the transmission member 73 relative to the fixed frame 6 by rotating the knob 21. The second linkage structure 72 is connected between the transmission member 73 and the contact connector S2 to realize the rotation of the contact connector S2 by the rotation of the transmission member 73 relative to the fixed frame 6, so that the moving contact moves.

[0079] In the first embodiment, the specific structure of the transmission member 73 is described as follows.

[0080] The transmission member 73 includes a first arm 731, a second arm 732, and an intermediate arm 733. The first arm 731 and the second arm 732 are spaced apart from each other, and the intermediate arm 733 is fixedly connected between the first arm 731 and the second arm 732. The first arm 731 is rotatably connected to the first plate 611, and the second arm 732 is rotatably connected to the second plate 612. In one embodiment, the first arm 731 and the second arm 732 have identical structures. The first arm 731 includes a first main arm 7311 and a first branch arm 7312. The first main arm 7311 is rotatably connected to the first plate 611. One end of the first branch arm 7312 is fixedly connected to the first main arm 7311, and the other end is rotatably connected to the first linkage structure 71. The second arm 732 includes a second main arm 7321 and a second branch arm 7322. The second main arm 7321 is rotatably connected to the second plate 612. One end of the second branch arm 7322 is fixedly connected to the second main arm 7321, and the other end is rotatably connected to the first linkage structure 71. The intermediate arm 733 is connected between the first main arm 7311 and the second main arm 7321. The end of the first main arm 7311 away from the intermediate arm 733 includes a connecting structure 731R. The connecting structure 731R is used to cooperate with the rotational matching structure 6112 of the first plate 611 (such as Figure 14 ), to achieve a rotational connection between the first main arm 7311 and the first plate 611. The second main arm 7321 and the first main arm 7311 may have the same structure, and the specific structure of the rotational connection relationship between the second main arm 7321 and the second plate 612 may be the same as the specific structure of the rotational connection relationship between the first main arm 7311 and the first plate 611.

[0081] The outer side of the first plate 611 refers to the side of the first plate 611 facing away from the second plate 612 (the side of the outer surface of the first plate 611), the inner side of the first plate 611 refers to the side of the first plate 611 facing the second plate 612 (the side of the inner surface of the first plate 611), the outer side of the second plate 612 refers to the side of the second plate 612 facing away from the first plate 611 (the side of the outer surface of the second plate 612), and the inner side of the second plate 612 refers to the side of the second plate 612 facing the first plate 611 (the side of the inner surface of the second plate 612). In one embodiment, the first arm 7312 is located on the outside of the first plate 611, the second arm 7322 is located on the outside of the second plate 612, the portion of the first main arm 7311 that is rotatably connected to the first plate 611 (the connection structure of the first main arm 7311) is located on the inside of the first plate 611, and the portion of the second main arm 7321 that is rotatably connected to the second plate 612 (the connection structure of the second main arm 7321) is located on the inside of the second plate 612. This solution achieves reliable assembly and positioning by arranging the first arm 7312 and a portion of the first main arm 7311 on either side of the first plate 611, and the second arm 7322 and a portion of the second main arm 7321 on either side of the second plate 612, respectively. This simplifies the assembly structure between the transmission member 73 and the fixed frame 6, and facilitates the miniaturization of the overall size of the force transmission mechanism.

[0082] The middle arm 733 of the transmission member is used to connect the second linkage structure 72. Specifically, the middle arm 733 and the second linkage structure 72 are elastically connected through an elastic member 74. The elastic member 74 can be a spring. The elastic member 74 is used to store elastic potential energy during the movement of the transmission member 73. The elastic potential energy of the elastic member 74 is used to drive the action of the force transmission mechanism.

[0083] In the first embodiment, the specific structure of the first linkage structure 71 is described as follows.

[0084] The first linkage structure 71 includes a first rotating structure 711 and a first connecting rod structure 712. The first rotating structure 711 includes a first portion 7111 and a second portion 7112 that are spaced apart and fixedly connected to each other. The first portion 7111 is sleeved around the periphery of the main shaft 62 and adjacent to the first plate 611. Specifically, the first portion 7111 is sleeved onto the first mounting sleeve 6114 of the first plate 611. The first portion 7111 is fixedly connected to the first base S11 of the knob connector S1. The first portion 7111 includes an annular body B1, a fixing foot B2, and an extension B3. The annular body B1 is sleeved onto the first mounting sleeve 6114. The fixing foot B2 extends from the outer edge of the annular body B1 toward the knob connector S1 and is fixedly connected to the first base S11 of the knob connector S1. Specifically, the fixing foot B2 is inserted into the first fixing hole S111 of the first base S11. The extension portion B3 extends outward from the outer edge of the annular body B1 in a radial direction of the annular body B1 and is used to connect to the first connecting rod structure 712. The second portion 7112 is sleeved around the periphery of the main shaft 62 and adjacent to the second plate 612. Specifically, the second portion 7112 is sleeved onto the second mounting sleeve 6124 of the second plate 612. The second portion 7112 includes an annular body B4 and an extension portion B5. The annular body B4 of the second portion 7112 is sleeved onto the second mounting sleeve 6124. The extension portion B5 of the second portion 7112 extends outward from the outer edge of the annular body B4 in a radial direction of the annular body B4. The extension portion B5 of the second portion 7112 is fixedly connected to the extension portion B3 of the first portion 7111.

[0085] The first rotating structure 711 is movably connected to the transmission member 73 via the first connecting rod structure 712 . One end of the first connecting rod structure 712 is rotatably connected to the first rotating structure 711 , and the other end is rotatably connected to the transmission member 73 .

[0086] The first connecting rod structure 712 includes a first rod 7121 and a second rod 7122. The first rod 7121 and the second rod 7122 are arranged relative to each other and fixedly connected. One end of the first rod 7121 is rotatably connected to the extension B3 of the first part 7111, and the other end is rotatably connected to the first support arm 7312 of the first arm 731. One end of the second rod 7122 is rotatably connected to the extension B5 of the second part 7112, and the other end is rotatably connected to the second support arm 7322 of the second arm 732. In this embodiment, a first linkage structure is formed between the first arm 731 of the transmission member 73 and the first portion 7111 of the first rotating structure 711 by the first rod 7121 and the first arm 7312. A second linkage structure is formed between the second arm 732 of the transmission member 73 and the second portion 7112 of the first rotating structure 711 by the second rod 7122 and the second arm 7322. When the knob is rotated, the first rotating structure 711 rotates about the main shaft 62, simultaneously driving the first and second linkage structures to move. The synchronized movement of the first and second linkage structures propels the transmission member 73 to rotate relative to the fixed frame 6. Because the forces exerted on the transmission member 73 by the first and second linkage structures are located on both sides of the transmission member 73, a balanced force is applied, resulting in balanced and stable movement of the transmission member 73. This improves the efficiency and smoothness of the switch opening and closing, and eliminates the problem of the transmission member 73 becoming stuck during movement.

[0087] In the first embodiment, the specific structure of the second linkage structure 72 is described as follows.

[0088] The second linkage structure 72 includes a second rotating structure 721 and a second connecting rod structure 722. The second rotating structure 721 includes an intermediate sleeve 7211 and a first protrusion 7212 and a second protrusion 7213 protruding from the outer surface of the intermediate sleeve 7211. The intermediate sleeve 7211 is sleeved on the main shaft 62 and is located between the first part 7111 and the second part 7112 of the first rotating structure 711. The first protrusion 7212 and the contact connector S2 are fixedly connected by a fixing pin 720. The fixing pin 720 and the outer surface of the second part 7112 of the first rotating structure 711 are spaced apart (such as Figure 15As shown in FIG5 , the outer side surface of the second part 7112 is the surface of the second part 7112 away from the main shaft 62 in the radial direction of the main shaft 62. The second protrusion 7213 is rotatably connected to one end of the second connecting rod structure 722. The second connecting rod structure 722 is located between the first plate 611 and the second plate 612 and is used to connect the transmission member 73. Specifically, the end of the second connecting rod structure 722 away from the second protrusion 7213 and the middle arm 733 of the transmission member 73 are elastically connected by an elastic member 74. During the rotation of the transmission member 73 relative to the fixed frame 6, the second connecting rod structure 722 is driven to move by the elastic member 74, and the second connecting rod structure 722 drives the second rotating structure 721 to rotate around the main shaft 62, and the moving contact will rotate synchronously with the second rotating structure 721.

[0089] In this embodiment, the second linkage structure 72 also includes a third linkage structure 723, one end of the third linkage structure 723 is rotatably connected to the end of the second linkage structure 722 away from the second protrusion 7213, and the other end of the third linkage structure 723 is rotatably connected to the tripping member 9, and the third linkage structure 723 is connected between the tripping member 9 and the first linkage structure 712. When the tripping member 9 and the tripper 8 are unlocked, the elastic force of the elastic member 74 will be transmitted to the tripping member 9 through the second linkage structure 72, so that the tripping member 9 can rotate relative to the fixed frame 6, and the third linkage structure 723 moves synchronously, and drives the second linkage structure 722 to move through the third linkage structure 723, and drives the second rotating structure 721 and the moving contact to rotate, so as to realize the free tripping (automatic tripping) of the switch.

[0090] In the first embodiment, the detailed structures of the tripping member 9 and the tripping device 8 are as follows.

[0091] The trip unit 8 includes a first tripping member 81 and a second tripping member 82, both of which are rotatably connected to the frame 61. Specifically, the first tripping member 81 is located between the first plate 611 and the second plate 612 and is rotatably connected to the first plate 611 and the second plate 612. The second tripping member 82 is also located between the first plate 611 and the second plate 612 and is rotatably connected to the first plate 611 and the second plate 612. The first tripping member 81 and the second tripping member 82 cooperate (or couple) to achieve free tripping (or automatic tripping). The first tripping member 81 is used to receive a tripping signal sent by the control unit of the power supply system. When the first tripping member 81 receives the tripping signal, it automatically releases the cooperation relationship (or decouples) with the second tripping member 82.

[0092] The tripping member 9 includes a tripping latch 91, a first adapter 92, and a second adapter 93. The tripping latch 91 is configured to engage with the second tripping member 82 in a locked state. When the first tripping member 81 receives a tripping signal, the first and second tripping members 81, 82 release their engagement, allowing the second tripping member 82 to move. In this case, the tripping latch 91 and the second tripping member 82 are unlocked. The first adapter 92 is configured to be rotatably connected to the frame 61 of the fixed frame 6. Specifically, the tripping member 9 is located between the first plate 611 and the second plate 612 and is rotatably connected to the first plate 611 and the second plate 612 via the first adapter 92. The second adapter portion 93 is rotatably connected to the third connecting rod structure 723 of the second linkage structure 72 of the transmission assembly 7. Thus, when the tripper latching portion 91 and the second tripping member 82 are unlocked, the elastic potential energy of the elastic member 74 connected between the transmission member 73 and the second linkage structure 72 drives the tripper 9 to rotate relative to the fixed frame 6. At the same time, the third connecting rod structure 723 drives the second connecting rod structure 722 and the second rotating structure 721 to move, causing the moving contact to move and achieve free tripping. On the tripper 9, the tripper latching portion 91, the first adapter portion 92, and the second adapter portion 93 are arranged in a triangular structure. This positional arrangement makes the overall structure of the tripper 9 have the advantage of being small in size, and the connection relationship between the tripper 9, the fixed frame 6, and the second linkage structure 72 is also compact.

[0093] Due to the coaxial and collinear design of the knob connector and the contact connector of the power mechanism, the overall structural design of the power mechanism is more compact, and the power mechanism can be arranged in a smaller space, which is conducive to the miniaturization design of the switch. On the other hand, the switch provided by the present application is safer. Specifically, when welding occurs between the moving contact and the static contact, during the normal manual opening process, the knob cannot move the moving contact when it is rotated to the preset position. In this case, the knob can be continued to be rotated so that the first rotating structure of the first linkage structure contacts and pushes against the second rotating structure of the second linkage structure. Through the holding force between the first rotating structure and the second rotating structure (this holding force is greater than the connection force generated by the welding between the moving contact and the static contact), the moving contact can be forced to leave the static contact to achieve opening.

[0094] In the power mechanism of the switch provided in the present application, the four-bar structure formed by the second linkage structure can realize the rotation of the moving contact by a larger angle when the transmission member rotates by a smaller angle. For example, the transmission member rotates 36 degrees and the moving contact rotates 90 degrees. When in the free tripping state (trip position), the small rotation angle of the transmission member can realize the large rotation angle of the moving contact, which will give maintenance personnel a clearer indication of the tripping state (trip position).

[0095] The working principle of the first embodiment can be found in Figures 19 to 24 , combined with Figures 14 to 18, where OA represents the contact connector, OE represents the knob connector, GFK represents the transmission member, OEK represents the first linkage structure (OE represents the first rotating structure 711, EK represents the first connecting rod structure 712), OABC represents the second linkage structure (OA represents the second rotating structure 721, AB represents the second connecting rod structure 722, BC represents the third connecting rod structure 723), the dotted line between GB represents the elastic member 74, DCH represents the tripping member 9, MY and XT represent the release 8 (XT represents the first release member 81, MY represents the second release member 82). The static contact is arranged horizontally, and the moving contact rotates clockwise around point O to close and counterclockwise to open. OA is rigidly coupled to the moving contact and rotates synchronously.

[0096] The process of manual opening of the switch is shown in Figure 19 、 Figure 20 and Figure 21 , Figure 19 The diagram shows the switch in the closed state (the moving contact and the static contact are in the closed state). Figure 20 The diagram shows the dead point position of the switch during the opening process. Figure 21 The diagram shows the switch in the open state (moving contact and static contact separated state). The process of manual opening is as follows: rotating the knob, the OE rod rotates around point O, and the four-bar linkage composed of OE-EK-FK moves. Due to the rigid coupling between the KF rod and the GF rod, the KF rod and the GF rod rotate synchronously around point F. When the OE rod is in Figure 19 After the closing position shown is rotated 90 degrees counterclockwise, the GF rod also rotates 36 degrees synchronously. There is an elastic piece hanging between point G on the GF rod and point B on the CB rod. When the OE rod drives the FK rod to rotate, the GF rod also rotates synchronously. When the OE rod rotates counterclockwise to Figure 20 When the dead point is in the position shown (elastic member GB and CB are in the same line), the OA rod fixedly connected to the moving contact does not rotate. Figure 20 When the dead point position shown is rotated again by a smaller angle, the pulling force of GB will generate a clockwise torque on the CB rod. The CB rod drives the BA rod and the AO rod, causing the AO rod to quickly open the moving contact in a counterclockwise direction. At this time, the switch is in Figure 21 The opening position is shown in the figure. In this way, the manual opening action is completed.

[0097] Figure 22 The diagram shows a certain position during manual closing. For the manual closing process of the switch, refer to Figure 21 and Figure 22 ,exist Figure 21 Based on the opening position shown in the figure, when the four-link OE-EK-KF drives OE to rotate clockwise under the action of external force, the GB spring rotates clockwise around point B. At a certain angle, that is, Figure 22When the position shown is reached, GB and CB coincide with each other. Before this, the moving contact does not rotate. When OE rotates clockwise again by a small angle, the spring GB will generate a counterclockwise torque around C on CB, and the four-link CB-BA-AO will quickly drive the moving contact system to close. Figure 19 Position shown.

[0098] Figure 23 and Figure 24 The diagram below shows the switch in free tripping state. Figure 23 As shown in the figure, when the tripper receives the opening signal of the power supply system, it opens TX and then unlocks MY, causing the tripper DCH to rotate counterclockwise to complete the free tripping. At this time, the moving contact has completed the opening to the maximum opening position, and the free tripping process is completed at this moment. At this time, OE also indicates the closed position. Figure 23 As shown, due to the tension of spring GB, a counterclockwise torque is generated on GF. Since GF and FK are rigidly coupled, under the connection of the four-bar linkage FK-KE-EO, the reset of OE is completed. Figure 24 The open position shown in the figure correctly indicates the position of the contacts. Due to the connection of the four-link FK-KE-EO, when the GF rod rotates counterclockwise to a small angle, the OE rod can move to a larger angle, thus Figure 24 Medium OE relative Figure 23 The OE in the circuit breaker has obvious angle differences, which will give maintenance personnel a clearer trip indication.

[0099] The process of resetting from the free-falling state is as follows: Figure 24 As shown in the figure, when OE in the four-link OE-EK-KF is driven to rotate counterclockwise, since KF and GF are rigidly coupled, and GS and GF are also rigidly coupled, GS will press down on the jumper HCD, driving HCD to rotate counterclockwise to the position of the lock MY, as shown in the figure. Figure 19 shown.

[0100] The embodiment of the present application can realize the three states of manual opening, manual closing and automatic tripping of the switch through the setting of the power mechanism, specifically, through the first linkage structure connected between the knob connector and the transmission member, and through the second linkage structure connected between the transmission member and the contact connector, and through the second linkage structure connected between the tripper and the contact connector. Moreover, the knob connector of the switch provided by the present application has obvious and easy-to-identify position indications in these three states. Specifically, refer to Figure 6The angle of rotation of the knob between the first position P1 and the second position P2 is 90 degrees, or close to 90 degrees (close to 90 degrees can be understood as within a certain range of about 90 degrees, for example, a range of 75 degrees to 105 degrees). The angle of rotation of the knob between the third position P3 and the first position P1 is greater than or equal to a preset value, and the angle of rotation of the knob between the third position P3 and the second position P2 is also greater than or equal to a preset value. The setting of the preset value here is intended to satisfy the naked eye's easy distinction between the third position P3 and the first position P1, and the easy distinction between the third position P3 and the second position P2. That is, when the switch is in a trip state (Trip state), it is easy to identify the third position P3 indicated by the knob. Specifically, this preset value can be greater than or equal to 20 degrees, or greater than or equal to 30 degrees. In a specific embodiment, the preset value is between 40 degrees and 50 degrees. The switch knob provided in the present application has a large angle of rotation, which makes it easy for the naked eye to identify the specific state of the switch, especially in the automatic trip state, and also has obvious position identification. This solution limits the large angle indication of the knob to facilitate identification, more convenient observation of the switch state, and easy detection of problems such as slight welding of contacts and failure to open the switch. The transmission member in the power mechanism of the second embodiment provided in this application is described as follows.

[0101] See Figure 25The transmission member 73 includes a first arm 731, a second arm 732, and an intermediate arm 733. The first arm 731 and the second arm 732 are spaced apart from each other. The intermediate arm 733 is fixedly connected between the first arm 731 and the second arm 732. The first arm 731 is rotationally connected to the first plate 611, and the second arm 732 is rotationally connected to the second plate 612. The intermediate arm 733 is used for rotationally connecting to the first link structure 712 of the first linkage structure 71. The intermediate arm 733 includes an intermediate body C1 and an intermediate link C2, which are fixedly connected to form an integral structure. The intermediate body C1 is connected between the edge of the first arm 731 and the edge of the second arm 732. The intermediate link C2 is located between the first arm 731 and the second arm 732 and extends from the intermediate body C1 toward the first link structure 712. The end of the intermediate link C2 away from the intermediate body C1 is rotationally connected to the first link structure 712. The first linkage structure 71 in this embodiment is the same as the first linkage structure of the power mechanism provided in the first embodiment, and the first rotation structure 711 and the first connecting rod structure 712 are the same as the corresponding first rotation structure and first connecting rod structure of the first embodiment. The difference between this embodiment and the first embodiment lies in the different connection structure between the transmission member and the first linkage structure 71. In this embodiment, the force exerted by the first linkage structure 71 on the transmission member 73 acts on the intermediate arm 733, so that the structure of the first arm 731 and the second arm 732 is simpler than the corresponding structure in the first embodiment, making the overall structure of the power mechanism compact and the size can be designed to be smaller. In the first embodiment, the force exerted by the first linkage structure on the transmission member acts on the first arm 731 and the second arm 732 to ensure the balance of force.

[0102] The transmission member and the first linkage structure of the power mechanism in the third embodiment provided in this application are described as follows.

[0103] See Figure 26 and Figure 27The difference between the third embodiment and the first embodiment is that: in the third embodiment, the specific structures of the transmission member 73 and the first linkage structure 71 are different. The first linkage structure 71 only includes the first rotating structure 711. The first rotating structure 711 and the transmission member 73 are slidingly connected to realize the rotation of the transmission member relative to the fixed frame by rotating the knob. The transmission member 73 includes a first arm 731, a first extension E1, a second arm 732, a second extension E2 and an intermediate arm 733. The first arm 731 and the second arm 732 are arranged relative to each other, and the intermediate arm 733 is fixedly connected between the first arm 731 and the second arm 732. The first arm 731 is rotatably connected to the first plate 611, and the second arm 732 is rotatably connected to the second plate 612. The intermediate arm 733 is used to connect the second linkage structure 72 through an elastic member. One end of the first extension E1 is fixedly connected to the first arm 731, and the other end of the first extension E1 is located on the side of the first part 7111 of the first rotating structure 711 away from the second part 7112, and is slidably connected to the first rotating structure 711. One end of the second extension E2 is fixedly connected to the second arm 732, and the other end is located on the side of the second part 7112 of the first rotating structure 711 away from the first part 7111, and is slidably connected to the second rotating structure 721.

[0104] The first rotating structure 711 includes a sliding rod 7114, which fixedly connects the first part 7111 and the second part 7112. The sliding rod 7114 includes a first sliding portion 7115 and a second sliding portion 7116. The first sliding portion 7115 is located on the side of the first part 7111 away from the second part 7112, and the second sliding portion 7116 is located on the side of the second part 7112 away from the first part 7111. The first extension E1 is provided with a first sliding groove E11, and the first sliding groove E11 cooperates with the first sliding portion 7115. The second extension E2 is provided with a second sliding groove E21, and the second sliding groove E21 cooperates with the second sliding portion 7116 to realize the sliding connection between the first rotating structure 711 and the transmission member 73, so as to realize the rotation of the transmission member relative to the fixed frame by rotating the knob.

[0105] The working principle of the power mechanism provided in the second and third embodiments is the same as that of the power mechanism provided in the first embodiment, and will not be described in detail.

[0106] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A power conversion device, characterized in that: The power conversion device includes a housing, a power conversion unit, a switch and a controller; wherein, The housing is used to accommodate the power conversion unit, the controller and part of the switch; The power conversion unit is used to convert direct current from the photovoltaic module into alternating current; The switch includes a knob, a power mechanism, and a contact assembly; wherein, The contact assembly includes a plurality of stacked contact units, each of which includes a moving contact and a stationary contact; The knob is used to drive the movable contact to rotate through the power mechanism. When the movable contact contacts the static contact, the switch is in a closed state. When the movable contact separates from the static contact, the switch is in an open state. The power mechanism includes a fixed frame, a first rotating structure, a first connecting rod structure and a transmission member; wherein, One end of the first rotating structure is fixedly connected to the knob, and the other end of the first rotating structure is transmission-connected to the transmission member through the first connecting rod structure, and the transmission member is rotationally connected to the fixed frame; wherein, The fixed frame, the first rotating structure, the first connecting rod structure and the transmission member form a four-bar linkage. When the knob drives the power mechanism to change from the open state to the closed state, the rotation angle of the knob is greater than the rotation angle of the transmission member relative to the fixed frame.

2. The power conversion device according to claim 1, characterized in that: The power conversion device further includes a controller, and the power mechanism further includes an elastic member, a second linkage structure, a second rotating structure, a tripping member, and a release; One end of the elastic member is connected to the transmission member, and the other end of the elastic member is transmission-connected to the second rotating structure via the second linkage structure. The second linkage structure is also rotationally connected to the tripping member, the tripping member is engaged with the release, and the tripping member is also rotationally connected to the fixing frame. When the photovoltaic component or the power conversion unit fails, the controller is used to control the release to release the engagement with the tripping member, so that the second linkage structure drives the second rotating structure to rotate, thereby driving the moving contact to separate from the static contact.

3. The power conversion device according to claim 2, characterized in that: The second linkage structure includes a second link structure and a third link structure, wherein the second link structure is rotationally connected to the second rotating structure, and the third link structure is rotationally connected to the jumper. When the moving contact contacts the static contact, the second link structure, the third link structure, the second rotating structure and the fixed structure form a four-link structure.

4. The power conversion device according to claim 2, characterized in that: The power mechanism further includes a contact connector, which is fixedly connected to the second rotating structure and is also fixedly connected to the moving contact.

5. The power conversion device according to claim 3, characterized in that: The power mechanism further includes a contact connector, which is fixedly connected to the second rotating structure and is also fixedly connected to the moving contact.

6. The power conversion device according to any one of claims 1 to 5, characterized in that: The fixing frame includes a main shaft and a first plate and a second plate that are arranged opposite to each other. The main shaft passes through the first plate and the second plate, and one end of the main shaft is used for fixed connection with the knob.

7. The power conversion device according to claim 6, characterized in that: The rotation center of the first rotating structure and the rotation center of the second rotating structure are both located on the central axis of the main shaft.

8. The power conversion device according to claim 6, characterized in that: The first rotating structure includes a first part and a second part that are arranged opposite to each other. The first part and the second part are sleeved on the main shaft. The first part is fixedly connected to the knob, and the first part is fixedly connected to the second part.

9. The power conversion device according to claim 7, characterized in that: The first rotating structure includes a first part and a second part that are arranged opposite to each other. The first part and the second part are sleeved on the main shaft. The first part is fixedly connected to the knob, and the first part is fixedly connected to the second part.

10. The power conversion device according to claim 8, characterized in that: The first part includes a connected annular body and an extension portion, the annular body is fixedly connected to the first rotating structure, and the extension portion is fixedly connected to the first connecting rod structure.

11. The power conversion device according to claim 9, characterized in that: The first part includes a connected annular body and an extension portion, the annular body is fixedly connected to the first rotating structure, and the extension portion is fixedly connected to the first connecting rod structure.

12. The power conversion device according to claim 6, characterized in that: The transmission member includes a first arm, a second arm and an intermediate arm. The first arm and the second arm are arranged opposite to each other. The intermediate arm is fixedly connected between the first arm and the second arm. The first arm is rotatably connected to the first plate, and the second arm is rotatably connected to the second plate.

13. The power conversion device according to any one of claims 7 to 11, characterized in that: The transmission member includes a first arm, a second arm and an intermediate arm. The first arm and the second arm are arranged opposite to each other. The intermediate arm is fixedly connected between the first arm and the second arm. The first arm is rotatably connected to the first plate, and the second arm is rotatably connected to the second plate.

14. The power conversion device according to claim 12, characterized in that: The first arm includes a first main arm and a first branch arm that are fixedly connected, and the second arm includes a second main arm and a second branch arm that are fixedly connected, wherein the first main arm is rotatably connected to the first plate, the second main arm is rotatably connected to the second plate, the first branch arm is rotatably connected to the first connecting rod structure, and the second branch arm is rotatably connected to the first connecting rod structure.

15. The power conversion device according to claim 13, characterized in that: The first arm includes a first main arm and a first branch arm that are fixedly connected, and the second arm includes a second main arm and a second branch arm that are fixedly connected, wherein the first main arm is rotatably connected to the first plate, the second main arm is rotatably connected to the second plate, the first branch arm is rotatably connected to the first connecting rod structure, and the second branch arm is rotatably connected to the first connecting rod structure.

16. The power conversion device according to claim 14 or 15, characterized in that: The first connecting rod structure includes a first rod and a second rod that are arranged opposite to each other. The first rod is rotatably connected to the first support arm, and the second rod is rotatably connected to the second support arm.

17. The power conversion device according to any one of claims 1 to 5, any one of claims 7 to 12, or any one of claims 14 to 15, characterized in that: When the knob drives the power mechanism to change from the open state to the closed state, the rotation angle of the knob is 90°, and the angle of the transmission member is 36°.

18. The power conversion device according to claim 6, characterized in that: When the knob drives the power mechanism to change from the open state to the closed state, the rotation angle of the knob is 90°, and the angle of the transmission member is 36°.

19. The power conversion device according to claim 13, characterized in that: When the knob drives the power mechanism to change from the open state to the closed state, the rotation angle of the knob is 90°, and the angle of the transmission member is 36°.

20. The power conversion device according to claim 16, wherein: When the knob drives the power mechanism to change from the open state to the closed state, the rotation angle of the knob is 90°, and the angle of the transmission member is 36°.

21. The power conversion device according to any one of claims 1 to 5, any one of claims 7 to 12, any one of claims 14 to 15, or any one of claims 18 to 20, characterized in that: When the switch is in the closed state, the knob points to the first position; when the switch is in the open state, the knob points to the second position; when the switch is in the automatic trip state, the knob points to the third position; The angle at which the knob rotates between the third position and the first position is greater than or equal to a preset value, and the angle at which the knob rotates between the third position and the second position is greater than or equal to the preset value.

22. The power conversion device according to claim 6, characterized in that: When the switch is in the closed state, the knob points to the first position; when the switch is in the open state, the knob points to the second position; when the switch is in the automatic trip state, the knob points to the third position; The angle at which the knob rotates between the third position and the first position is greater than or equal to a preset value, and the angle at which the knob rotates between the third position and the second position is greater than or equal to the preset value.

23. The power conversion device according to claim 13, characterized in that: When the switch is in the closed state, the knob points to the first position; when the switch is in the open state, the knob points to the second position; when the switch is in the automatic trip state, the knob points to the third position; The angle at which the knob rotates between the third position and the first position is greater than or equal to a preset value, and the angle at which the knob rotates between the third position and the second position is greater than or equal to the preset value.

24. The power conversion device according to claim 16, characterized in that: When the switch is in the closed state, the knob points to the first position; when the switch is in the open state, the knob points to the second position; when the switch is in the automatic trip state, the knob points to the third position; The angle at which the knob rotates between the third position and the first position is greater than or equal to a preset value, and the angle at which the knob rotates between the third position and the second position is greater than or equal to the preset value.

25. The power conversion device according to claim 17, characterized in that: When the switch is in the closed state, the knob points to the first position; when the switch is in the open state, the knob points to the second position; when the switch is in the automatic trip state, the knob points to the third position; The angle at which the knob rotates between the third position and the first position is greater than or equal to a preset value, and the angle at which the knob rotates between the third position and the second position is greater than or equal to the preset value.

26. The power conversion device according to claim 21, characterized in that: The preset value is greater than or equal to 20°.

27. The power conversion device according to any one of claims 22 to 25, characterized in that: The preset value is greater than or equal to 20°.

28. The power conversion device according to any one of claims 1 to 5, 7 to 12, 14 to 15, 18 to 20, or 22 to 26, wherein: The power mechanism further includes a knob connector, wherein the knob connector is fixedly connected to the knob, and the knob connector is fixedly connected to the first rotating structure.

29. The power conversion device according to claim 6, characterized in that: The power mechanism further includes a knob connector, wherein the knob connector is fixedly connected to the knob, and the knob connector is fixedly connected to the first rotating structure.

30. The power conversion device according to claim 13, characterized in that: The power mechanism further includes a knob connector, wherein the knob connector is fixedly connected to the knob, and the knob connector is fixedly connected to the first rotating structure.

31. The power conversion device according to claim 16, characterized in that: The power mechanism further includes a knob connector, wherein the knob connector is fixedly connected to the knob, and the knob connector is fixedly connected to the first rotating structure.

32. The power conversion device according to claim 17, characterized in that: The power mechanism further includes a knob connector, wherein the knob connector is fixedly connected to the knob, and the knob connector is fixedly connected to the first rotating structure.

33. The power conversion device according to claim 21, characterized in that: The power mechanism further includes a knob connector, wherein the knob connector is fixedly connected to the knob, and the knob connector is fixedly connected to the first rotating structure.

34. The power conversion device according to claim 27, characterized in that: The power mechanism further includes a knob connector, wherein the knob connector is fixedly connected to the knob, and the knob connector is fixedly connected to the first rotating structure.

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