Switching device and inverter

Abstract

The present application provides a switching device and an inverter. The switching device comprises a housing, an operating handle, an operating mechanism, a movable contact, a stationary contact, and a trip unit. The operating mechanism comprises a latching assembly and a trip latch. When the latching assembly is at a first position, the latching assembly engages with the trip latch. When the latching assembly is at a second position, the latching assembly disengages from the trip latch. The trip unit comprises a moving shaft, two coils, and two permanent magnets. The two permanent magnets generate two acting forces in opposite directions on the moving shaft. When the two coils are energized, an acting force exerted by the coils on the moving shaft is superimposed on one of the two acting forces and at least partially cancels the other acting force, so that the moving shaft moves close to or away from the latching assembly. On the basis of a drive signal, the trip unit drives the latching assembly to rotate to the second position, so that the latching assembly remains disengaged from the trip latch. As a result, the operating handle is disengaged from the operating mechanism and cannot drive the movable contact to move, thereby preventing the switching device from closing and improving the stability of the switching device in a tripped state.

Description

A switching device and an inverter

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411048486.6, filed on July 31, 2024, entitled "A Switching Device and Inverter", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of power technology, and in particular to a switching device and an inverter. Background Technology

[0004] With the advent of electricity, switching devices play a vital role in many production processes and technical equipment. In power systems, switching devices are used for the distribution, control, and protection of electrical energy. Taking rotary disconnect switches as an example, rotary disconnect switches are a commonly used switching device in circuits. In the field of photovoltaic power generation, rotary disconnect switches typically consist of an operating mechanism, a multi-pole switching unit, and a remote trip unit.

[0005] In photovoltaic (PV) power generation scenarios, multiple PV panel conductors are connected to the input terminals of multiple controllable DC switches (hereinafter referred to as "switches"). Due to limitations in conductor length, quantity, and site conditions, external faults are unavoidable in practice. Additionally, internal inverter faults may also occur. In such cases, the switch disconnects under the influence of a fault current signal. The controller needs to detect the fault and, upon confirmation, automatically disconnect the switch via a magnetic flux integrated into it to ensure line safety.

[0006] However, in practical applications, users may not be able to determine the reason for the switch tripping, and may perform manual tripping and reclosing operations multiple times while the fault current signal is still present, which can easily lead to switch failure. Summary of the Invention

[0007] This application provides a switching device and an inverter, which keeps the operating handle of the switching device in a disengaged state from the operating mechanism in the event of a fault, so that the switching device cannot be closed, thereby improving the stability of the switching device in the tripping state.

[0008] In a first aspect, this application provides a switching device. The switching device includes a housing, an operating handle, an operating mechanism, a moving contact, a stationary contact, and a trip unit. Specifically, the operating handle is connected to the operating mechanism, and the operating mechanism is connected to the moving contact. At least the portion of the operating handle near the operating mechanism, the operating mechanism, the moving contact, the stationary contact, and the trip unit are located within the housing. The operating mechanism includes a locking assembly and a transmission assembly. The operating handle and the moving contact are respectively drivenly connected to the transmission assembly. The transmission assembly includes a trip latch. The trip latch and the locking assembly rotate relative to the housing. When the locking assembly is in a first position, the locking assembly and the trip latch remain engaged, allowing the operating handle to control the operating mechanism to move the moving contact, thereby causing the moving contact to contact or separate from the stationary contact. When the locking assembly is in a second position, the locking assembly disengages from the trip latch, thereby disengaging the operating handle from the transmission assembly, preventing the operating handle from controlling the operating mechanism to move the moving contact, and keeping the moving contact separated from the stationary contact. The trip unit includes a moving shaft, a first coil, a second coil, a first permanent magnet, and a second permanent magnet. The movable shaft and the housing are slidable relative to each other, and the movable shaft is drive-connected to the locking assembly. A first coil and a second coil are connected in series and wound around the outer circumference of the movable shaft. A first permanent magnet and a second permanent magnet are fixed relative to the housing, located between the first coil and the second coil. Along the sliding direction of the movable shaft, the first and second permanent magnets are positioned opposite each other on opposite sides of the movable shaft. The magnetic circuit direction within the first permanent magnet is opposite to and perpendicular to the sliding direction of the second permanent magnet. In the portion of the movable shaft located on the side of the first permanent magnet facing the first coil, the magnetic circuit direction of the magnetic field generated by the first and second permanent magnets is a first direction. In the portion of the movable shaft located on the side of the first permanent magnet facing the second coil, the magnetic circuit direction of the magnetic field generated by the first and second permanent magnets is a second direction. The first and second directions are opposite, and both are parallel to the sliding direction. The trip unit is used to energize the first coil and the second coil according to the drive signal and generate a first induced magnetic field, so that the magnetic circuit direction of the first induced magnetic field in the moving shaft is the same as the first direction and opposite to the second direction, so that the moving shaft slides along the first direction and abuts against the locking assembly, thereby rotating the locking assembly from the first position to the second position, so that the locking assembly disengages from the trip latch and remains in the disengaged state.

[0009] The switching device of this application can be applied in an inverter to connect or disconnect the inverter circuit and the photovoltaic module. When an external or internal fault occurs in the inverter, the inverter controller can send a drive signal to the switching device, causing it to trip. During the tripping process, inside the switching device, the trip unit drives the latching assembly to rotate from a first position to a second position, disengaging the latching assembly from the trip latch of the transmission assembly. This disengages the transmission assembly from the operating handle and separates the moving and stationary contacts. Thus, the switching device remains in the tripped state, and the operating handle cannot control the operating mechanism to move the moving contact, keeping the moving and stationary contacts separated. Therefore, even when the operating handle is operated, the trip unit will still disengage the latching assembly from the trip latch when an external or internal fault occurs in the inverter, preventing the operating mechanism from moving the moving contact and thus preventing the switching device from closing, thereby improving the stability of the switching device in the tripped state.

[0010] In the aforementioned switching device, the magnetic fields generated by the first and second permanent magnets exert two opposing forces on the moving shaft: a first force and a second force. The direction of the first force is the first direction, and the direction of the second force is the second direction. When the switching device receives a drive signal, the first induced magnetic field generated by the first and second coils produces a third force on the moving shaft. The direction of this third force is the same as the first direction of the first force and opposite to the second direction of the second force. Thus, a portion of the third force is superimposed on and amplified by the first force, while another portion of the third force at least partially cancels out the second force. Therefore, under the action of the superimposed forces, the moving shaft slides along the first direction, that is, it approaches and abuts against the locking assembly, thereby driving the locking assembly to rotate from the first position to the second position and holding the locking assembly in the second position.

[0011] In one possible implementation, the trip unit is further configured to energize the first and second coils according to a reset signal, generating a second induced magnetic field. This second induced magnetic field is positioned in the same direction as the second direction and opposite to the first direction in the moving shaft, causing the moving shaft to slide and reset along the second direction. This allows the latching assembly to reset from the second position to the first position, so that the latching assembly engages with the trip latch when the operating handle moves the operating mechanism. In this technical solution, the inverter controller can send a reset signal to the switching device, causing the trip unit to reset. Thus, the latching assembly can reset to the first position and remain in that position. Therefore, when the operating handle moves the operating mechanism, the trip latch can engage with the latching assembly, thereby enabling the switching device to close and open via the operating handle, thus improving the stability of the switching device under normal operating conditions. By changing the current direction of the first and second coils when energized, the stability of the switching device in both trip and normal operating states can be achieved, thus realizing a bistable state for the switching device.

[0012] The aforementioned switching device is applied to the inverter and is used to connect or disconnect the inverter circuit and the photovoltaic module. The switching device receives a drive signal when an external or internal fault occurs in the inverter. When an internal fault occurs in the inverter, the switching device receives a reset signal after the fault is resolved. When an external fault occurs in the inverter, the switching device receives a reset signal before the fault is resolved. Internal inverter faults may be caused by malfunctions in the inverter's internal equipment, including but not limited to overvoltage faults, overcurrent faults, and breakdown faults. Therefore, internal inverter faults require professional maintenance personnel to resolve and cannot be handled solely by the user. External inverter faults may be caused by external environmental faults. These external environmental faults may occur either inside or outside the inverter; in this application, they are both considered external inverter faults. External inverter faults can be inspected and resolved by the user or the system. Therefore, when an internal fault occurs in the inverter, the inverter controller sends a reset signal to the switching device only after the fault has been resolved. This prevents damage to the inverter from the user closing the switching device before the fault is resolved. When an external fault occurs in the inverter, the inverter controller can send a reset signal to the switching device before the fault is resolved. This allows the user to check or the system to perform normal closing and opening of the switching device.

[0013] In one possible implementation, the latching assembly is further provided with a reset element, which drives the latching assembly to reset from the second position to the first position, so that the latching assembly engages with the trip latch when the operating handle moves the operating mechanism. Thus, after the moving shaft resets, the latching assembly can be reset to the first position under the action of the reset element. Therefore, the operating handle, driving the transmission assembly, can re-engage the latching assembly with the trip latch, thereby enabling the switching device to close and open.

[0014] In the switching device of this application, the trip unit may further include a mounting plate and a magnetic yoke. The mounting plate is fixed relative to the housing, and the magnetic yoke is a U-shaped magnetic yoke. The mounting plate covers the opening of the U-shaped magnetic yoke and forms a receiving space. A moving shaft, a first coil, a second coil, a first permanent magnet, and a second permanent magnet are located within the receiving space. In one possible implementation, the mounting plate is located on the side of the U-shaped magnetic yoke closer to the locking assembly, and the mounting plate has a first opening. One end of the moving shaft passes through the first opening and extends out of the receiving space. In another possible implementation, the mounting plate is located on the side of the U-shaped magnetic yoke away from the locking assembly. The U-shaped magnetic yoke includes two parallel sidewalls and a bottom wall connecting the two sidewalls, and the bottom wall is opposite to the mounting plate. The bottom wall has a second opening. One end of the moving shaft passes through the second opening and extends out of the receiving space. In another possible implementation, the mounting plate has a first opening. The U-shaped magnetic yoke includes two parallel sidewalls and a bottom wall connecting the two sidewalls, and the bottom wall is opposite to the mounting plate. The bottom wall has a second opening. One of the first and second openings is located near the locking assembly. One end of the moving shaft passes through the first opening and extends out of the receiving space, while the other end passes through the second opening and extends out of the receiving space. In the above technical solution, when the first and second coils are energized, the magnetic yoke can diffuse the induced magnetic field generated by the first and second coils to the entire receiving space, so that the induced magnetic field can cover the moving shaft.

[0015] In one possible implementation, the locking assembly includes a pull rod and a locking rod, both rotatably connected to the housing. The pull rod is located on the side of the locking rod away from the jump catch. The locking rod is used to engage or disengage with the jump catch. When the locking assembly is in a first position, a first surface of the pull rod abuts against the locking rod, engaging the locking rod with the jump catch. When the locking assembly is in a second position, a second surface of the pull rod abuts against the locking rod, disengaging the locking rod from the jump catch. When the locking assembly rotates from the first position to the second position, the locking rod slides from the first surface of the pull rod to the second surface. When the locking assembly returns to its original position from the second position, the locking rod slides from the second surface of the pull rod back to the first surface. By changing the surfaces of the pull rod and the locking rod that abut against each other, the locking rod can be engaged or disengaged from the jump catch; in practical applications, this can be achieved by rotating the pull rod.

[0016] The relative positions of the trip unit and the operating assembly within the housing are not limited. Specifically, the trip unit and the operating mechanism are located on the same side of the locking assembly. Alternatively, the trip unit and the operating mechanism are located on opposite sides of the locking assembly.

[0017] The magnetic field generated by the first permanent magnet has a magnetic circuit direction within the first permanent magnet that is opposite to the magnetic field generated by the second permanent magnet within the second permanent magnet. Specifically, this can include: in one possible implementation, the magnetic pole of the end of the first permanent magnet facing the second permanent magnet is the N pole, and the magnetic pole of the end of the second permanent magnet facing the first permanent magnet is also the N pole. In another possible implementation, the magnetic pole of the end of the first permanent magnet facing the second permanent magnet is the S pole, and the magnetic pole of the end of the second permanent magnet facing the first permanent magnet is also the S pole.

[0018] The specific type of switching device in this application is not limited. For example, the switching device may include a circuit breaker, a disconnecting switch, or other circuit switches.

[0019] In one possible implementation, the switching device includes multiple moving contacts and multiple stationary contacts, wherein the number of moving contacts and the number of stationary contacts are equal and arranged in a one-to-one correspondence, and each of the moving contacts is drivenly connected to a transmission assembly. A single moving contact and its corresponding stationary contact can form a contact assembly, used to connect or disconnect a branch. The switching device of this technical solution can be applied to multiple branches in a circuit.

[0020] Secondly, this application provides an inverter. The inverter includes an inverter circuit, a controller, and the switching device described in the first aspect. The inverter circuit is electrically connected to a photovoltaic module via the switching device. The switching device is used to connect or disconnect the electrical connection between the photovoltaic module and the inverter circuit. The controller is electrically connected to the switching device. The controller is used to send a drive signal to the switching device when an external or internal fault occurs in the inverter. The trip unit of the switching device is used to disengage the operating handle from the operating mechanism according to the drive signal, thereby preventing the operating handle from controlling the operating mechanism to drive the moving contact, thus keeping the moving contact separated from the stationary contact to disconnect the electrical connection between the photovoltaic module and the inverter circuit.

[0021] When an external or internal fault occurs in the inverter, the switching device trips. During the tripping process, the trip unit disengages the latching assembly from the trip latch by driving the latching component, thereby disengaging the operating mechanism from the operating handle and separating the moving and stationary contacts. Because the trip unit drives the latching assembly to remain in the second position, even if the operating handle is operated while the switching device is in the tripped state, the trip unit will still disengage the latching assembly from the trip latch, preventing the operating mechanism from moving the moving contact. This prevents the switching device from closing, keeping the electrical connection between the photovoltaic modules and the inverter circuit disconnected, thus improving the inverter's safety.

[0022] In one possible implementation, the controller is also used to send a reset signal to the switching device. The trip unit of the switching device, based on the reset signal, enables the operating handle to control the operating mechanism to move the moving contact, causing the moving contact to contact or separate from the stationary contact, thereby connecting or disconnecting the electrical connection between the photovoltaic module and the inverter circuit. In this technical solution, the inverter controller can send a reset signal to the switching device, causing the trip unit to reset. This allows the latching assembly to reset to and remain in the first position. Therefore, when the operating handle moves the operating mechanism, the trip can engage with the latching assembly, thereby enabling the switching device to close and open via the operating handle, thus improving the stability of the switching device during normal operation.

[0023] In the aforementioned inverter, when an external fault occurs, the controller sends a reset signal to the switching device before the fault is resolved. When an internal fault occurs, the controller sends a reset signal to the switching device after the fault is resolved. Internal faults may be caused by inherent defects in the inverter's internal components, including but not limited to overvoltage, overcurrent, and breakdown faults. Therefore, internal faults require professional maintenance personnel to resolve and cannot be handled solely by the user. External faults may be caused by environmental faults. These external environmental faults can occur either inside or outside the inverter; both are considered external faults in this application. External faults can be inspected and resolved by the user or the system. Therefore, when an internal fault occurs, the inverter controller sends a reset signal to the switching device only after the fault is resolved. This prevents damage to the inverter caused by the user closing the switching device before the fault is resolved. When an external fault occurs in the inverter, the inverter controller can send a reset signal to the switching device before the fault is resolved. This allows the user to check or the system to perform a self-test before the switching device can be closed and opened normally. Attached Figure Description

[0024] Figure 1 is a schematic diagram of an application scenario of a power system provided in an embodiment of this application;

[0025] Figure 2 is a partial schematic diagram of a power system in Figure 1 within the dashed box;

[0026] Figure 3 is a schematic diagram of a switching device provided in an embodiment of this application;

[0027] Figure 4 is another schematic diagram of the switching device provided in an embodiment of this application;

[0028] Figure 5 is another schematic diagram of the switching device provided in an embodiment of this application;

[0029] Figure 6 is an exploded view of a switching device provided in an embodiment of this application;

[0030] Figure 7 is a schematic diagram of the engagement of the traction rod and the locking rod provided in an embodiment of this application;

[0031] Figure 8 is a schematic diagram of the cooperation of the traction rod, locking rod and jumper provided in an embodiment of this application;

[0032] Figure 9 is a schematic diagram of the traction rod, locking rod and jumper provided in the embodiment of this application when the locking assembly is in the first position;

[0033] Figure 10 is a schematic diagram of the traction rod, locking rod and jumper provided in the embodiment of this application when the locking assembly is in the second position;

[0034] Figure 11 is an exploded view of the operating mechanism provided in an embodiment of this application;

[0035] Figure 12 is another schematic diagram of the traction rod, locking rod and transmission mechanism provided in the embodiment of this application;

[0036] Figure 13 is a partial schematic diagram of the switching device in Figure 12;

[0037] Figure 14 is an exploded schematic diagram of the operating mechanism and moving contact provided in an embodiment of this application;

[0038] Figure 15 is a schematic diagram of the switching device provided in the embodiment of this application in the open state;

[0039] Figure 16 is a partial schematic diagram of the switching device in Figure 15;

[0040] Figure 17 is a schematic diagram of the switching device provided in the embodiment of this application in a tripped state;

[0041] Figure 18 is a partial schematic diagram of the switching device in Figure 17;

[0042] Figure 19 is a schematic diagram of a trip unit provided in an embodiment of this application;

[0043] Figure 20 is an exploded view of the trip unit in Figure 19;

[0044] Figure 21 is another schematic diagram of the trip unit provided in an embodiment of this application;

[0045] Figure 22 is another schematic diagram of the trip unit provided in an embodiment of this application;

[0046] Figure 23 is another schematic diagram of the trip unit provided in an embodiment of this application;

[0047] Figure 24 is another schematic diagram of the switching device provided in the embodiment of this application.

[0048] Reference numerals: 10-Photovoltaic power generation system; 20-Power system; 21-Controller; 30-Switch device; 31-Operating handle; 32-Operating mechanism; 33-Contact assembly; 34-Trip device; 311-Knob; 321-Traction rod; 322-Lock rod; 323-First mounting plate; 324-Second mounting plate; 325-Spring; 326-Drive crank; 341-First coil; 342-Second coil; 343-First permanent magnet; 344-Second permanent magnet; 345-Moving shaft; 346-Mounting plate; 347-Magnetic yoke; 348-First opening; 349-Second opening; 3221-Groove; 3222-Hook; S1-First surface; S2-Second surface; COD-Input crank; DF-Input connecting rod; FG-Rock arm; HE-Jump lever; HJ-Upper connecting rod; JK-Lower connecting rod; KO'L'-Output crank; LL'-Output shaft Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0050] To facilitate understanding of the switching device and inverter provided in the embodiments of this application, their application scenarios are described below. The switching device and inverter provided in the embodiments of this application can be widely used in various power supply and distribution systems. In one example provided in this application, the inverter can be applied to a photovoltaic power generation system. A photovoltaic power generation system is a system that uses solar energy to generate electricity, providing people with clean and renewable energy by converting solar energy into electrical energy. Figure 1 is a schematic diagram of an application scenario of the power system provided in the embodiments of this application, and Figure 2 is a partial schematic diagram of a power system in Figure 1 within the dashed box. As shown in Figures 1 and 2, the photovoltaic power generation system 10 includes an energy storage system and photovoltaic modules. The photovoltaic panel strings in the photovoltaic modules convert solar energy into direct current (DC) through the photovoltaic effect. The inverter converts the DC output from the photovoltaic modules into alternating current (AC) and further transmits the AC to a prefabricated substation. The prefabricated substation converts the low-voltage AC output from the inverter into medium-voltage AC and further transmits the AC to a step-up substation, the power grid, or the prefabricated substation corresponding to the energy storage system. The energy storage system stores the unstable electrical energy from the photovoltaic modules. The system comprises multiple parallel-connected battery clusters, which output stable electrical energy to the grid via an energy storage converter and a corresponding prefabricated substation. The power system 20 includes photovoltaic modules and an inverter. In this power system 20, the inverter includes an inverter circuit, a controller 21, and a switching device 30. The inverter circuit is electrically connected to the photovoltaic modules via the switching device 30. The switching device 30 is used to connect or disconnect the electrical connection between the photovoltaic modules and the inverter circuit. When maintenance, repair, or replacement of the battery clusters or photovoltaic panel strings is required, the electrical connection between the photovoltaic modules and the inverter circuit can be disconnected by disconnecting the switching device 30. This ensures that no danger is posed to personnel or the inverter during maintenance and repair of the power system 20. Additionally, the switching device 30 can also be used for the regulation and control of the power system 20. The controller 21 is electrically connected to the switching device 30 and is used to control the switching device 30 to connect and disconnect.

[0051] The switching device 30 of this application can be applied to multiple circuits. In one embodiment, the switching device 30 includes an operating handle, an operating mechanism, multiple moving contacts, and multiple stationary contacts. The operating handle is drive-connected to the operating mechanism. The number of the multiple moving contacts and the number of the multiple stationary contacts are equal and correspond one-to-one. The multiple moving contacts are drive-connected to the operating mechanism. A single moving contact and its corresponding stationary contact can form a contact assembly and be used to connect or disconnect a circuit. Figure 3 is a schematic diagram of a switching device provided in an embodiment of this application. As shown in Figure 3, in one embodiment, the switching device 30 can be a rotary disconnector, which includes a multi-layer contact assembly. For example, the power system 20 includes 14 strings of photovoltaic panels, which are connected to the rotary disconnector. The rotary disconnector includes at least 12 layers of contact assemblies, each of which includes a pair of moving contacts and a pair of stationary contacts. The stationary contacts of the multi-layer contact assembly are stacked and installed by interlocking with each other through a connecting mechanism. When the operating handle is turned, the operating handle can drive the operating mechanism to move, thereby causing the operating mechanism to drive the moving contacts in each layer of the contact assembly to move and contact or separate from the stationary contacts, achieving the effect of synchronous movement.

[0052] As shown in Figure 2, when an external or internal fault occurs in the inverter, the controller 21 generates a drive signal and sends it to the switching device 30. This drive signal can be a tripping command sent by the controller 21 or a change in current parameters. When the switching device 30 receives the drive signal, it trips (i.e., the switching device 30 trips and the operating handle cannot be closed), disconnecting the photovoltaic modules and inverter circuit at both ends of the switching device 30. At this time, the operating mechanism inside the switching device 30 disengages from the operating handle, preventing closure. Since manually driving the operating handle can reconnect the operating handle to the operating mechanism, the switching device 30 will be briefly closed manually until the fault is resolved.

[0053] However, since the fault has not been resolved, the switching device will still trip after a brief closing. Repeated closing can easily damage the switching device, causing it to fail, which is detrimental to the safety and voltage output stability of the inverter.

[0054] In view of this, this application provides a switching device and an inverter to keep the operating handle of the switching device in a disengaged state from the operating mechanism in the event of a fault, so that the switching device cannot be closed, thereby improving the stability of the switching device in the tripping state.

[0055] It should be noted that the terminology used in the following embodiments is for the purpose of describing specific embodiments only and is not intended to be a limitation of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to also include expressions such as “one or more,” unless the context clearly indicates otherwise.

[0056] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0057] Figure 4 is another schematic diagram of the switching device provided in an embodiment of this application, Figure 5 is another schematic diagram of the switching device provided in an embodiment of this application, and Figure 6 is an exploded view of the switching device provided in an embodiment of this application. As shown in Figures 4, 5, and 6, the switching device 30 includes a housing (not shown), an operating handle 31, an operating mechanism 32, a contact assembly 33, and a trip unit 34, wherein the operating handle 31 is throttle-connected to the operating mechanism 32. The contact assembly 33 includes a moving contact 331 and a stationary contact, and the operating mechanism 32 is connected to the moving contact 331. At least the portion of the operating handle 31 closest to the operating mechanism 32, the operating mechanism 32, the contact assembly 33, and the trip unit 34 are located within the housing. The operating handle 31 is used to control the operating mechanism 32 to move the moving contact 331, so that the moving contact 331 can contact or separate from the stationary contact. In one embodiment, the end of the operating handle 31 away from the operating mechanism 32 can extend out of the housing, so that the operator can push the operating handle 31 to perform closing and opening operations. In another embodiment, a knob 311 is provided on the outer surface of the housing to manually operate the switch device 30 to open and close the circuit. Specifically, the end of the operating handle 31 away from the operating mechanism 32 extends out of the housing and connects to the knob 311. When the operator manually operates the knob, rotating the knob 311 can move the operating handle 31. In another embodiment, the switch device 30 may also include a remote controller and an electric operating device. The electric operating device is connected to the operating handle 31 and the remote controller to electrically operate the switch device 30 to open and close the circuit. When the operator electrically operates the device, a closing command or an opening command is sent to the remote controller. The remote controller can control the electric operating device to drive the operating handle 31 to move. In this embodiment, the operator can issue commands by being near the switch device 30 or remotely through a communication device.

[0058] As shown in Figure 6, the operating mechanism 32 includes a locking assembly and a transmission assembly. The locking assembly includes a traction rod 321 and a locking lever 322. The transmission assembly includes a jump catch HE. The traction rod 321 and the locking lever 322 are positioned close to the transmission assembly, and both rotate relative to the housing. That is, the rotation center A of the traction rod 321 and the rotation center B of the locking lever 322 do not overlap. The locking lever 322 is used to engage or disengage with the jump catch HE.

[0059] Figure 7 is a schematic diagram of the engagement of the traction rod and the locking rod provided in an embodiment of this application, and Figure 8 is a schematic diagram of the engagement of the traction rod, the locking rod, and the jump buckle provided in an embodiment of this application. As shown in Figures 7 and 8, the locking rod 322 is provided with a groove 3221. The jump buckle HE is provided with a hook 3222 on the side near the locking rod 322. The hook 3222 can hook the groove 3221, thereby realizing the engagement of the locking rod 322 and the jump buckle HE.

[0060] Figure 9 is a schematic diagram of the traction rod, locking rod, and jump buckle provided in the embodiment of this application when the locking assembly is in the first position. As shown in Figure 9, when the locking assembly is in the first position, the first surface S1 of the traction rod 321 abuts against the locking rod 322, so that the locking rod 322 and the jump buckle HE are engaged. Figure 10 is a schematic diagram of the traction rod, locking rod, and jump buckle provided in the embodiment of this application when the locking assembly is in the second position. As shown in Figure 10, when the locking assembly is in the second position, the second surface S2 of the traction rod 321 abuts against the locking rod 322, and the locking rod 322 is disengaged from the jump buckle HE. The first surface S1 and the second surface S2 of the traction rod 321 are arranged adjacent to each other. The release device 34 drives the locking assembly to rotate counterclockwise around point A, so that the locking assembly rotates from the first position to the second position. During the process of the locking assembly rotating from the first position to the second position, the locking rod 322 rotates counterclockwise around point B and slides from the first surface S1 of the traction rod 321 to the second surface S2, thereby separating the locking rod 322 from the jump buckle HE.

[0061] Figure 11 is an exploded view of the operating mechanism provided in an embodiment of this application. As shown in Figures 6 and 11, the operating mechanism 32 further includes a first mounting plate 323 and a second mounting plate 324. The transmission assembly further includes an input crank COD, an input connecting rod DF, a rocker arm FG, an upper connecting rod HJ, a lower connecting rod JK, an output crank KO'L', an output shaft LL' (not shown in the figure), and a spring 325. The first mounting plate 323 and the second mounting plate 324 are disposed opposite to each other, and the first mounting plate 323 and the second mounting plate 324 are respectively fixed relative to the housing. The operating handle 31 passes through the first mounting plate 323 and the second mounting plate 324, and one end of the operating handle 31 is located on the side of the first mounting plate 323 away from the second mounting plate 324. The input crank COD and the input connecting rod DF are located on the side of the first mounting plate 323 away from the second mounting plate 324. The jumper HE, the rocker arm FG, the upper connecting rod HJ, the lower connecting rod JK, and the output crank KO'L' are located between the first mounting plate 323 and the second mounting plate 324.

[0062] Figure 12 is another schematic diagram of the traction rod, locking rod, and transmission mechanism provided in the embodiment of this application. As shown in Figure 12, specifically, the operating handle 31 can rotate clockwise or counterclockwise relative to the first mounting plate 323. The input crank COD is sleeved on the operating handle 31 and is fixedly connected to the operating handle 31. Thus, when the operating handle 31 rotates, the input crank COD can rotate around point O with the operating handle 31. One end of the input connecting rod DF is rotatably connected to the input crank COD at point D, and the other end of the input connecting rod DF is rotatably connected to the rocker arm FG at point F. The rocker arm FG is rotatably connected to the first mounting plate 323 and the second mounting plate 324 at point G, so that the rocker arm FG can rotate around G relative to the first mounting plate 323 and the second mounting plate 324.

[0063] Figure 13 is a partial schematic diagram of the switching device in Figure 12. As shown in Figures 12 and 13, the trip latch HE is rotatably connected to the first mounting plate 323 and the second mounting plate 324 at point E, allowing the trip latch HE to rotate relative to the first mounting plate 323 and the second mounting plate 324 around point E. One end of the upper connecting rod HJ is rotatably connected to the trip latch HE at point H. The other end of the upper connecting rod HJ is rotatably connected to one end of the lower connecting rod JK at point J, and the other end of the lower connecting rod JK is rotatably connected to the output crank KO'L' at point K. The output crank KO'L' is coaxially arranged with the operating handle 31, and the output crank KO'L' can rotate relative to the second mounting plate 324 around point O'. The output shaft LL' is fixedly connected to the output crank KO'L' at point L'. The first mounting plate 323 is provided with a first sliding groove 3231, and the second mounting plate 324 is provided with a second sliding groove 3241. The output shaft LL' passes through the first slide groove 3231 and the second slide groove 3241, and the output shaft LL' can slide simultaneously within the first slide groove 3231 and the second slide groove 3241. One end of the spring 325 is fixed relative to the rocker arm FG at point P. The upper connecting rod HJ and the lower connecting rod JK are rotatably connected at point J via a rotating shaft, and the other end of the spring 325 can be fixed relative to this rotating shaft at point J.

[0064] Figure 14 is an exploded view of the operating mechanism and moving contact provided in an embodiment of this application. As shown in Figures 10 and 14, the operating mechanism 32 further includes a drive crank 326, which is located on the side of the second mounting plate 324 opposite to the first mounting plate 323. The drive crank 326 is coaxially arranged with the operating handle 31, and the drive crank 326 can rotate relative to the second mounting plate 324 about point O'. One end of the output shaft LL' passes through the second slide groove 3241 and is fixedly connected to the drive crank 326, so that when the output shaft LL' slides in the second slide groove 3241, the drive crank 326 follows the output shaft LL' to rotate about point O'. The drive crank 326 is fixedly connected to the moving contact 331, so that the drive crank 326 can drive the moving contact 331 to rotate.

[0065] In one embodiment, the traction rod 321 is provided with a reset member, which drives the latch assembly to rotate from a second position to a first position, so that the latch rod 322 engages with the trip latch HE when the operating handle 31 drives the operating mechanism 32. Thus, after the trip unit 34 disengages from the latch assembly, the latch assembly can be reset to the first position by the reset member, thereby waiting for the latch rod 322 to re-engage with the trip latch HE, enabling the switching device 30 to close and open.

[0066] The closing, opening, and tripping of the switching device 30 are described in detail below.

[0067] As shown in Figures 12 and 13, the switch device 30 is in the closed state, with the moving contact 331 in contact with the stationary contact. At this time, the latch assembly is in the first position, and the hook 3222 hooks the groove 3221, causing the latch rod 322 to engage with the trip latch HE. Thus, the trip latch HE remains stationary. One end of the spring 325 is located at point P, and point P is located to the right of the upper connecting rod HJ. The other end of the spring 325 is located at point J, causing the spring 325 to exert a rightward force on the rotation axis of point J. If the rocker arm FG continues to rotate clockwise around point G from the position in Figure 13, point P can continue to move to the right. In this case, the lower connecting rod JK tends to move clockwise under the action of the spring 325, that is, point K tends to move clockwise around O', causing the output crank KO'L' to tend to rotate clockwise around point O'. However, the first slide 3231 and the second slide 3241 limit the rotation of the output shaft LL', thereby limiting the movement of the output crank KO'L', the lower connecting rod JK, the upper connecting rod HJ, and the rocker arm FG in sequence, so that the rocker arm FG is kept in the position shown in Figure 13, and the switch device 30 is kept in the closed state.

[0068] Figure 15 is a schematic diagram of the switching device provided in the embodiment of this application in the open state, and Figure 16 is a partial schematic diagram of the switching device in Figure 15. As shown in Figures 15 and 16, the switching device 30 is in the open state, and the moving contact 331 and the stationary contact are separated. At this time, the latching assembly is in the first position, and the hook 3222 hooks the groove 3221, so that the latching rod 322 is engaged with the trip latch HE. In this way, the trip latch HE remains stationary.

[0069] When the switching device 30 switches from the closed state to the open state, the operating handle 31 rotates counterclockwise around point O, thereby causing the input crank COD to rotate counterclockwise around point O in tandem with the operating handle 31. During the counterclockwise rotation of the input crank COD, point D moves to the right and causes point F to move to the upper right, which in turn causes the rocker arm FG to rotate counterclockwise around point G. During the counterclockwise rotation of the rocker arm FG around point G, point P of the spring 325 moves from the right side of the upper connecting rod HJ to the left side of the upper connecting rod HJ. When point P is located on the left side of the upper connecting rod HJ, the spring 325 applies a leftward force to the rotation axis of point J, thereby causing point J to move to the upper left, which in turn causes the lower connecting rod JK to move counterclockwise. During the counterclockwise movement of the lower connecting rod JK, the output crank KO'L' rotates clockwise around point O', causing the moving contact 331 to rotate clockwise and separate from the stationary contact.

[0070] When the switching device 30 switches from the open state to the closed state, the operating handle 31 rotates clockwise around point O, thereby causing the input crank COD to rotate clockwise around point O in tandem with the operating handle 31. During the clockwise rotation of the input crank COD, point D moves to the left and point F moves to the lower left, thus causing the rocker arm FG to rotate clockwise around point G. During the clockwise rotation of the rocker arm FG around point G, point P of the spring 325 moves from the left side of the upper connecting rod HJ to the right side of the upper connecting rod HJ. When point P is located on the right side of the upper connecting rod HJ, the spring 325 applies a rightward force to the rotation axis of point J, thereby causing point J to move to the lower right, thus causing the lower connecting rod JK to move clockwise. During the clockwise movement of the lower connecting rod JK, the output crank KO'L' rotates counterclockwise around point O', causing the moving contact 331 to rotate counterclockwise and contact the stationary contact.

[0071] Figure 17 is a schematic diagram of the switching device provided in the embodiment of this application in a tripped state, and Figure 18 is a partial schematic diagram of the switching device in Figure 17. As shown in Figures 17 and 18, the switching device 30 is in a tripped state, with the moving contact 331 and the stationary contact separated. At this time, the latching assembly is in the second position, and the hook 3222 disengages from the groove 3221, causing the latching rod 322 to disengage from the trip latch HE. When the switching device 30 switches from the closed state to the tripped state, the trip unit 34 drives the traction rod 321 to rotate counterclockwise around point A, thereby reducing the force of the traction rod 321 against the latching rod 322, causing the latching rod 322 to rotate counterclockwise around point B, and thus disengaging the latching rod 322 from the trip latch HE. At the instant the trip latch HE disengages from the latching rod 322, the trip latch HE rotates clockwise around point E, causing point H to move to the right. During the clockwise rotation of the trip button HE, the upper connecting rod HJ is driven to move clockwise, causing point J to move to the upper left, which in turn drives the lower connecting rod JK to move counterclockwise. During the counterclockwise movement of the lower connecting rod JK, the output crank KO'L' rotates clockwise around point O', causing the moving contact 331 to rotate clockwise and separate from the stationary contact, thus tripping the switching device 30.

[0072] Figure 19 is a schematic diagram of a trip unit provided in an embodiment of this application, and Figure 20 is an exploded view of the trip unit in Figure 19. As shown in Figures 19 and 20, the trip unit 34 includes a first coil 341, a second coil 342, a first permanent magnet 343, a second permanent magnet 344, and a moving shaft 345. The moving shaft 345 is slidable relative to the housing and is connected to the locking assembly. One end of the moving shaft 345 along the sliding direction can be located close to the traction rod 321. The first coil 341 and the second coil 342 are connected in series and wound around the outer periphery of the moving shaft 345. The first permanent magnet 343 and the second permanent magnet 344 are respectively fixed relative to the housing and are located between the first coil 341 and the second coil 342. Along the sliding direction of the moving shaft 345, the first permanent magnet 343 and the second permanent magnet 344 are located on opposite sides of the moving shaft 345. The magnetic field generated by the first permanent magnet 343 is oriented in the magnetic circuit direction within the first permanent magnet 343, which is opposite to the magnetic field generated by the second permanent magnet 344 within the magnetic circuit direction of the second permanent magnet 344 and perpendicular to the sliding direction of the moving shaft 345. In the portion of the moving shaft 345 located on the side of the first permanent magnet 343 facing the first coil 341, the magnetic circuit direction of the magnetic fields generated by the first permanent magnet 343 and the second permanent magnet 344 is a first direction. In the portion of the moving shaft 345 located on the side of the first permanent magnet 343 facing the second coil 342, the magnetic circuit direction of the magnetic fields generated by the first permanent magnet 343 and the second permanent magnet 344 is a second direction. The first direction and the second direction are opposite, and both directions are parallel to the sliding direction.

[0073] When the aforementioned switching device 30 is applied to an inverter, it is used to turn the inverter circuit and photovoltaic modules on or off. The switching device 30 can be electrically connected to the controller 21. The switching device 30 is used to energize the first coil 341 and the second coil 342 according to a drive signal and / or a reset signal. For example, when the drive signal and reset signal received by the switching device 30 are current signals, the current directly energizes the first coil 341 and the second coil 342. Alternatively, when the drive signal and reset signal received by the switching device 30 are signal commands sent by the controller 21, the controller 21 can control the energization of the first coil 341 and the second coil 342. Specifically, when the first coil 341 and the second coil 342 are energized, the magnetic path direction of the induced magnetic field generated by the first coil 341 in the moving shaft 345 is the same as the magnetic path direction of the induced magnetic field generated by the second coil 342 in the moving shaft 345, and is the same as one of the first and second directions, so that the moving shaft 345 moves along one of the directions, thereby keeping the latching assembly in the first or second position.

[0074] Figure 21 is another schematic diagram of the trip unit provided in an embodiment of this application. As shown in Figure 21, the magnetic field generated by the first permanent magnet 343 and the second permanent magnet 344 acts on the moving shaft 345, that is, the magnetic field generates two forces in opposite directions on the moving shaft 345, namely a first force F1 and a second force F2, the direction of the first force F1 being the first direction and the direction of the second force F2 being the second direction. When the first coil 341 and the second coil 342 are energized, the induced magnetic field generated by the first coil 341 and the second coil 342 generates a third force F3 on the moving shaft 345. The direction of the third force F3 is the same as that of one of the first force F1 and the second force F2, and opposite to that of the other one of the first force F1 and the second force F2. In this way, a part of the third force F3 is superimposed on and reinforces one of the first force F1 and the second force F2, and the other part of the third force F3 at least partially cancels out the other one of the first force F1 and the second force F2. Therefore, the moving shaft 345 slides along one of the first and second directions under the action of the superimposed force, that is, it moves closer to or away from the operating mechanism 32, so that the trip unit 34 keeps the operating mechanism 32 locked before the fault current disappears, and unlocks the operating mechanism 32 when a reset signal is received, thereby improving the stability of the operating mechanism 32 in the locked and unlocked states.

[0075] Figure 22 is another schematic diagram of the trip unit provided in an embodiment of this application. As shown in Figure 22, the trip unit 34 can be used to energize the first coil 341 and the second coil 342 according to a drive signal to generate a first induced magnetic field, so that the magnetic circuit direction of the first induced magnetic field in the moving shaft 345 is the same as the first direction and opposite to the second direction, so that the moving shaft 345 slides along the first direction and abuts against the traction rod 321, thereby rotating the latching assembly from the first position to the second position and tripping the switching device 30. Specifically, when an external or internal fault occurs in the inverter, the controller 21 sends a drive signal to the switching device 30. At this time, the first coil 341 and the second coil 342 are energized, and the current direction of the coils is the first current direction. In this embodiment, the magnetic circuit direction of the induced magnetic field generated by the first coil 341 and the second coil 342 in the moving shaft 345 is the same as the first direction. Thus, the induced magnetic field generated by the first coil 341 and the second coil 342 acts on the third force F3 in the moving shaft 345. Part of this force is superimposed on the first force F1, and the other part is canceled out by the second force F2 (as shown by the dashed arrow). In this way, the superimposed force is greater than the canceled force, which can cause the moving shaft 345 to slide along the first direction and abut against the traction rod 321, so that the locking rod 322 and the jump buckle HE are disengaged.

[0076] Figure 23 is another schematic diagram of the trip unit provided in this application embodiment. As shown in Figure 23, the trip unit 34 can also be used to energize the first coil 341 and the second coil 342 according to the reset signal and generate a second induced magnetic field, so that the magnetic circuit direction of the second induced magnetic field in the moving shaft 345 is the same as the second direction and opposite to the first direction, so that the moving shaft 345 slides and resets along the second direction, thereby enabling the latching assembly to reset from the second position to the first position, rotating and unlocking the operating mechanism 32, and switching the switch device 30 from the locked state to the unlocked state. Specifically, the controller 21 sends a reset signal to the switch device 30. At this time, the first coil 341 and the second coil 342 are energized, and the current direction of the coil is the second current direction. Since the first current direction is opposite to the second current direction, the induced electric fields generated by the circuit fault and the reset command of the first coil 341 and the second coil 342 are different, thereby driving the moving shaft 345 to perform different movements. Therefore, the trip unit 34 can distinguish between the drive signal and the reset signal by setting the current direction. In this embodiment, the induced magnetic field generated by the first coil 341 and the second coil 342 has the same magnetic circuit direction in the moving shaft 345 as the second direction. Thus, the induced magnetic field generated by the first coil 341 and the second coil 342 acts on the third force F3 in the moving shaft 345, part of which is superimposed on the second force F2, and the other part is canceled out by the first force F1 (as shown by the dashed arrow). Therefore, the superimposed force is greater than the canceled force, allowing the moving shaft 345 to slide along the second direction and disengage from the traction rod 321, enabling the locking assembly to reset from the second position to the first position. This allows the locking rod 322 to engage with the trip lever HE when the operating handle 31 moves the operating mechanism 32. Thus, before receiving a reset signal, the trip unit 34 remains locked, preventing manual operation from closing the circuit, thereby ensuring circuit safety.

[0077] When an external or internal fault occurs in the inverter, the inverter controller 21 generates a drive signal, causing the switching device 30 to trip. At this time, inside the switching device 30, the trip unit 34 disengages the operating mechanism 32 from the operating handle 31, preventing the switching device from closing. When the trip unit 34 receives a reset signal, the operating handle 31 controls the operating mechanism 32 to move the moving contact 331, thereby enabling the switching device 30 to close and open. Therefore, both the drive signal and the reset signal can energize the first coil 341 and the second coil 342. Thus, the switching device 30 of this application can achieve a bistable function, meaning that the trip unit 34 can maintain the state corresponding to the operating mechanism 32 both in the event of a circuit fault and after the fault is resolved, and the bistable function can be achieved by changing the current direction of the first coil 341 and the second coil 342 when energized.

[0078] When an internal inverter fault occurs, the switching device 30 receives a reset signal after the fault is resolved. When an external inverter fault occurs, the switching device 30 receives a reset signal before the fault is resolved. Internal inverter faults may be caused by inherent defects in the inverter's internal components, including but not limited to overvoltage, overcurrent, and breakdown faults. Therefore, internal inverter faults require professional maintenance personnel to resolve and cannot be handled solely by the user. External inverter faults may be caused by external environmental faults. These external environmental faults may occur either inside or outside the inverter; in this application, they are both considered external inverter faults. External inverter faults can be inspected and resolved by the user or the system. Therefore, when an internal inverter fault occurs, the inverter controller 21 sends a reset signal to the switching device 30 only after the fault is resolved. This prevents damage to the inverter caused by the user closing the switching device 30 before the fault is resolved. When an external fault occurs in the inverter, the inverter controller 21 can send a reset signal to the switching device 30 before the fault is resolved. In this way, the switching device 30 can be closed and opened normally after the user checks or the system self-tests.

[0079] In the above embodiment, in the scenario where an external fault occurs in the inverter, before the fault is resolved, specifically after the controller 21 sends a drive signal to the switching device 30, the controller 21 immediately sends a reset signal to the switching device 30. That is, when an external fault occurs in the inverter, the switching device 30 receives the drive signal and the reset signal sequentially, causing the moving shaft 345 to first move along the first direction and then reset along the second direction. Thus, after the fault is resolved, the operating handle 31 can be directly driven to rotate without waiting for the moving shaft 345 to reset.

[0080] It should be noted that, in the embodiments of this application, the switching device 30 can be a disconnecting switch, a circuit breaker, a load switch, or other types of switches.

[0081] The magnetic field generated by the first permanent magnet 343 has a magnetic circuit direction within the first permanent magnet 343 that is opposite to the magnetic field generated by the second permanent magnet 344 within the second permanent magnet 344. Specifically, in one embodiment, the magnetic pole of the end of the first permanent magnet 343 facing the second permanent magnet 344 is the N pole, and the magnetic pole of the end of the second permanent magnet 344 facing the first permanent magnet 343 is the N pole. In another embodiment, the magnetic pole of the end of the first permanent magnet 343 facing the second permanent magnet 344 is the S pole, and the magnetic pole of the end of the second permanent magnet 344 facing the first permanent magnet 343 is the S pole.

[0082] As shown in Figures 19 and 20, the trip unit 34 may further include a mounting plate 346 and a magnetic yoke 347. The mounting plate 346 is fixed relative to the housing, and the magnetic yoke 347 is a U-shaped magnetic yoke. The mounting plate 346 covers the opening of the U-shaped magnetic yoke and forms a receiving space. The moving shaft 345, the first coil 341, the second coil 342, the first permanent magnet 343, and the second permanent magnet 344 can be accommodated within the receiving space. In one embodiment, the mounting plate 346 is located on the side of the U-shaped magnetic yoke closer to the operating mechanism 32, and the mounting plate 346 is provided with a first opening 348. The end of the moving shaft 345 closer to the operating mechanism 32 passes through the first opening 348 and extends out of the receiving space. In another embodiment, the mounting plate 346 is located on the side of the U-shaped magnetic yoke away from the operating mechanism 32. The U-shaped magnetic yoke includes two parallel sidewalls and a bottom wall connecting the two sidewalls, and the bottom wall is disposed opposite to the mounting plate 346. The bottom wall is provided with a second opening 349. One end of the moving shaft 345 near the operating mechanism 32 passes through the second opening 349 and extends out of the receiving space. In another embodiment, the mounting plate 346 is provided with a first opening 348. The U-shaped magnetic yoke includes two parallel sidewalls and a bottom wall connecting the two sidewalls, the bottom wall being disposed opposite to the mounting plate 346. The bottom wall is provided with a second opening 349. One of the first opening 348 and the second opening 349 is located near the operating mechanism 32. One end of the moving shaft 345 passes through the first opening 348 and extends out of the receiving space, and the other end passes through the second opening 349 and extends out of the receiving space. In this embodiment, the mounting plate 346 can be located on the side of the U-shaped magnetic yoke near the operating mechanism 32, or the mounting plate 346 can also be located on the side of the U-shaped magnetic yoke away from the operating mechanism 32. In the above embodiments, when the first coil 341 and the second coil 342 are energized, the magnetic yoke 347 can diffuse the induced magnetic field generated by the first coil 341 and the second coil 342 to the entire receiving space, so that the induced magnetic field can cover the moving shaft 345.

[0083] Within the housing, the relative positions of the trip unit 34 and the operating mechanism 32 are not limited. As shown in Figures 5 and 12, the operating mechanism 32 is located on one side of the latching assembly. The trip unit 34 can be located on the side of the latching assembly away from the operating mechanism 32, that is, the trip unit 34 and the operating mechanism 32 are located on opposite sides of the latching assembly. Figure 24 is another schematic diagram of the switching device provided in an embodiment of this application. As shown in Figures 4 and 24, the trip unit 34 can be located on the side of the latching assembly closer to the operating mechanism 32, that is, the trip unit 34 and the operating mechanism 32 are located on the same side of the latching assembly.

[0084] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A switching device, characterized by The device comprises a shell, an operating handle, an operating mechanism, a movable contact, a static contact and a tripping device, wherein: the operating handle is connected with the operating mechanism, the operating mechanism is connected with the movable contact; at least the part of the operating handle close to the operating mechanism, the operating mechanism, the movable contact, the static contact and the tripping device are located in the shell; the operating mechanism comprises a lock assembly and a transmission assembly; the operating handle and the movable contact are respectively in transmission connection with the transmission assembly; the transmission assembly comprises a jump buckle, the jump buckle and the lock assembly are respectively in relative rotation with the shell; when the lock assembly is in a first position, the lock assembly keeps in engagement with the jump buckle, so that the operating handle can control the operating mechanism to drive the movable contact to move, thereby making the movable contact contact or separate from the static contact; when the lock assembly is in a second position, the lock assembly is disengaged from the jump buckle, so that the operating handle is tripped from the transmission assembly, so that the operating handle cannot control the operating mechanism to drive the movable contact, and the movable contact keeps in a separated state from the static contact; the tripping device comprises a moving shaft, a first coil, a second coil, a first permanent magnet and a second permanent magnet; the moving shaft is in sliding connection with the shell, the moving shaft is in transmission connection with the lock assembly; the first coil and the second coil are in series and are arranged around the outer periphery of the moving shaft; the first permanent magnet and the second permanent magnet are respectively fixed relative to the shell, and the first permanent magnet and the second permanent magnet are located between the first coil and the second coil; along the sliding direction of the moving shaft, the first permanent magnet and the second permanent magnet are located on both sides of the moving shaft; the magnetic path direction in the first permanent magnet is opposite to the magnetic path direction in the second permanent magnet and is perpendicular to the sliding direction; in the part of the moving shaft located on the side of the first permanent magnet towards the first coil, the magnetic path direction of the magnetic field generated by the first permanent magnet and the second permanent magnet is a first direction; in the part of the moving shaft located on the side of the first permanent magnet towards the second coil, the magnetic path direction of the magnetic field generated by the first permanent magnet and the second permanent magnet is a second direction; the first direction is opposite to the second direction, and the first direction and the second direction are parallel to the sliding direction; the tripping device is used to make the first coil and the second coil be electrified and generate a first induced magnetic field according to a driving signal, so that the magnetic path direction of the first induced magnetic field in the moving shaft is the same as the first direction and opposite to the second direction, so that the moving shaft slides along the first direction and abuts against the lock assembly, thereby making the lock assembly rotate from the first position to the second position, so that the lock assembly is disengaged from the jump buckle and keeps in a disengaged state.

2. The switching device of claim 1, wherein The tripping device is further configured to energize the first coil and the second coil and generate a second induced magnetic field according to a reset signal, so that the second induced magnetic field has the same magnetic path direction in the moving shaft as the second direction and opposite to the first direction, so as to reset the moving shaft to slide in the second direction, thereby enabling the lock assembly to be reset from the second position to the first position to be engaged with the jump ring when the operating handle drives the operating mechanism to move.

3. A switching device as claimed in claim 1 or 2, characterized in that The lock assembly is provided with a reset member configured to drive the lock assembly to reset from the second position to the first position to be engaged with the jump ring when the operating handle drives the operating mechanism to move.

4. The switch device according to any one of claims 1 to 3, wherein The tripping device further comprises a mounting plate and a magnetic yoke; the mounting plate is fixed opposite to the shell; the magnetic yoke is a U-shaped magnetic yoke, the mounting plate covers the opening of the U-shaped magnetic yoke and forms an accommodation space; the moving shaft, the first coil, the second coil, the first permanent magnet and the second permanent magnet are located in the accommodation space; The mounting plate is located on one side of the U-shaped magnetic yoke close to the lock assembly, and the mounting plate is provided with a first opening, one end of the moving shaft passes through the first opening and extends out of the accommodation space; or, The mounting plate is located on one side of the U-shaped magnetic yoke away from the lock assembly; the U-shaped magnetic yoke comprises two parallel sidewalls and a bottom wall connecting the two sidewalls, the bottom wall is arranged opposite to the mounting plate; the bottom wall is provided with a second opening; one end of the moving shaft passes through the second opening and extends out of the accommodation space.

5. The switch device according to any one of claims 1 to 4, wherein The lock assembly comprises a traction rod and a lock rod, the traction rod and the lock rod are respectively rotationally connected with the shell, the traction rod is located on one side of the lock rod away from the jump ring; the lock rod is configured to be engaged with or disengaged from the jump ring; When the lock assembly is in the first position, a first surface of the traction rod abuts against the lock rod and engages the lock rod with the jump ring; when the lock assembly is in the second position, a second surface of the traction rod abuts against the lock rod and disengages the lock rod from the jump ring; when the lock assembly rotates from the first position to the second position, the lock rod slides from the first surface to the second surface of the traction rod; when the lock assembly resets from the second position to the first position, the lock rod slides from the second surface to the first surface of the traction rod.

6. The switch device according to any one of claims 1 to 5, wherein The tripping device and the operating mechanism are located on the same side of the lock assembly; or, the tripping device and the operating mechanism are located on opposite sides of the lock assembly.

7. The switch device according to any one of claims 1 to 6, wherein The end of the first permanent magnet facing the second permanent magnet has a N-pole, and the end of the second permanent magnet facing the first permanent magnet has a N-pole; or, The end of the first permanent magnet facing the second permanent magnet has a S-pole, and the end of the second permanent magnet facing the first permanent magnet has a S-pole.

8. The switch device according to any one of claims 1 to 7, wherein The switch device comprises a circuit breaker or a disconnector.

9. The switch device according to any one of claims 1 to 8, wherein The switch device comprises a plurality of moving contacts and a plurality of static contacts, the number of the plurality of moving contacts and the number of the plurality of static contacts are equal and one-to-one corresponding, and the plurality of moving contacts are respectively in driving connection with the transmission assembly.

10. An inverter, characterized by comprising: The inverter circuit, the controller and the switch device as claimed in any one of claims 1 to 9 are comprised; The inverter circuit is electrically connected with the photovoltaic module through the switch device, and the switch device is used for turning on or off the electrical connection between the photovoltaic module and the inverter circuit; the controller is electrically connected with the switch device; The controller is used for sending the drive signal to the switch device when the external fault or the internal fault of the inverter occurs, and the trip device of the switch device is used for making the operating handle and the operating mechanism trip according to the drive signal, so that the operating handle cannot control the operating mechanism to drive the moving contact, so that the moving contact and the static contact are kept separated to disconnect the electrical connection between the photovoltaic module and the inverter circuit.

11. The inverter of claim 10, wherein, The controller is also used for sending the reset signal to the switch device; The trip device of the switch device is used for making the operating handle control the operating mechanism to drive the moving contact to move according to the reset signal, so that the moving contact and the static contact are in contact or separated to turn on or off the electrical connection between the photovoltaic module and the inverter circuit.

12. The inverter of claim 11, wherein, When the external fault of the inverter occurs, the controller is used for sending the reset signal to the switch device before the fault; When the internal fault of the inverter occurs, the controller is used for sending the reset signal to the switch device after the fault.

Images