Switching device and power converter

Abstract

The invention provides a switching device and a power converter, and relates to the technical field of photovoltaic power generation. The power converter comprises a switching device, a power conversion circuit and a controller, when an external fault occurs, the controller sends a first driving signal to the first driving device, the first driving device drives the operation mechanism to act, and the operation mechanism drives the moving contact to move to realize opening; after the first driving device drives the operation mechanism to act, the handle is further used for driving the reset piece to move from the first position to the second position through the operation mechanism so that the reset piece can drive the first driving device to reset. When an internal fault occurs, the controller sends a first driving signal to the first driving device and sends a second driving signal to the second driving device, the second driving device drives the reset piece to break away from a motion path from the first position to the second position, and the first driving device keeps a non-reset state and the moving contact is in an opening state. The power converter can prevent the switching device from being switched on when an internal fault occurs.

Description

Technical Field

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

[0002] A photovoltaic (PV) power generation system converts solar energy into direct current (DC) electricity through PV modules, which is then converted into alternating current (AC) electricity by an inverter before being fed into the power grid. In the entire system, the DC switch serves as the core control and protection device, used to safely disconnect the circuit under normal or fault conditions, and is a crucial line of defense for ensuring the stable operation and equipment safety of the PV power generation system.

[0003] In practical applications, the output leads of multiple photovoltaic modules need to be connected to the input terminals of multiple controllable DC switches. Due to limitations in the length and quantity of wiring in the field, as well as environmental factors, this wiring is prone to failure; simultaneously, internal system faults in the inverter also occur frequently. Upon detecting these faults, the controller triggers the trip unit inside the DC switch to automatically trip the circuit breaker to ensure safety. However, current DC switches generally lack intuitive fault indication functions, making it difficult for users to accurately determine the cause of the fault after the switch has tripped. Blindly closing the circuit breaker before the internal fault has been eliminated not only affects system recovery but may also exacerbate the fault's impact and even lead to more serious equipment damage. Summary of the Invention

[0004] This application provides a switching device and a power converter. The switching device and power converter can prevent the switching device from closing in the event of an internal fault, thereby avoiding the escalation of the fault.

[0005] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0006] On one hand, this application provides a power converter, which includes a switching device, a power conversion circuit, and a controller. The switching device includes a handle, an operating mechanism, multiple stacked switch bodies, a reset element, a first driving device, and a second driving device. Each switch body includes a moving contact, a first stationary contact, and a second stationary contact. The moving contact rotates relative to a first housing of the switch body, while the first and second stationary contacts are fixed relative to the first housing. The first stationary contact is used for electrical connection with a photovoltaic module, and the second stationary contact is used for electrical connection with the power conversion circuit. The operating mechanism is drivenly connected to the handle, the moving contact, and the reset element. Both the first and second driving devices are drivenly connected to the reset element, and the first driving device is also drivenly connected to the operating mechanism. When the first driving device is reset, the handle drives the moving contact of each switch body to rotate via the operating mechanism, causing the moving contact to contact or separate from the first and second stationary contacts. In the event of a fault in the photovoltaic module or its connecting lines, the controller sends a first drive signal to the first drive device. Upon receiving the first drive signal, the first drive device drives an operating mechanism to move the moving contact, separating it from the first and second stationary contacts. After the first drive device drives the operating mechanism, the handle also drives a reset member from a first position to a second position via the operating mechanism, causing the reset member to reset the first drive device. In the event of a fault in the power converter, the controller sends a first drive signal to the first drive device and a second drive signal to the second drive device. Upon receiving the second drive signal, the second drive device drives the reset member to disengage from the first position along its movement path to the second position. The first drive device remains in an unreset state, and the moving contact remains separated from the first and second stationary contacts.

[0007] The power converter provided in this application employs the above-described configuration. If a fault occurs in the photovoltaic module or its connecting lines (i.e., an external fault), the controller sends a first drive signal to the first drive device to control its operation. The first drive device drives the operating mechanism, enabling it to move the moving contact and separate it from the first and second stationary contacts, thus achieving a tripping operation due to an external fault in the switching device. After an external fault occurs, the user can drive the operating mechanism via a handle to move the reset element from the first position to the second position, thereby resetting the first drive device. After the first drive device resets, the user can drive the operating mechanism via a handle to perform a tripping or closing operation between the moving contact and the first and second stationary contacts.

[0008] If the power converter malfunctions (i.e., an internal fault occurs), the controller sends a first drive signal to the first drive device to control its operation, causing the moving contact to open with the first and second stationary contacts. Simultaneously, the controller sends a second drive signal to the second drive device to control its operation. The second drive device's operation drives the reset element, causing it to move from the first position to the second position. At this point, the operating mechanism cannot drive the first drive device to reset via the reset element, and the first drive device remains in an unreset state. The user cannot perform opening or closing operations by using the handle to operate the operating mechanism. The power converter provided in this application can prevent the first drive device from resetting and prevent the switching device from closing when an internal fault occurs, thus avoiding the escalation of the fault.

[0009] In one possible implementation, when the fault of the power converter is eliminated, the second drive device is also used to release the drive of the reset member under the action of an external force and reset it so that the reset member is reset to the first position.

[0010] This application employs an externally driven reset mechanism, which increases the level of human intervention. It ensures that professional maintenance personnel can confirm the internal fault has been resolved before external force is used to reset the mechanism, preventing secondary damage or escalation of the fault due to continued operation under internal fault conditions. Simultaneously, this human intervention method avoids the need for reset operations when internal faults remain unresolved due to automatic restarts caused by control system malfunctions. The final decision to restore the switching device to normal operation is entrusted to professional maintenance personnel, thereby improving equipment reliability.

[0011] In one possible implementation, if the fault of the power converter is cleared, the controller is also configured to send a reset signal to the second drive unit; the second drive unit is also configured to release the drive of the reset element and reset it after receiving the reset signal, so that the reset element is reset to the first position.

[0012] This application employs an electrical control method to release the drive of the reset component, thereby resetting it. This shortens the reset time of the switching device after an internal fault is cleared, reducing labor and time costs, and facilitating rapid recovery in remote, dangerous, or hard-to-reach installation locations. Furthermore, this control method makes it easier to centrally manage and record the status of the fault recovery process, thus improving the overall intelligence level of operation and maintenance.

[0013] In one possible implementation, if a photovoltaic module or its connection line fails and the number of times the controller sends a first drive signal to a first drive device exceeds a threshold, the controller is also configured to send a second drive signal to a second drive device.

[0014] With the above-described configuration, after an external fault causes a trip, the user can manually turn the handle to drive the operating mechanism, which in turn drives the reset element to act on the first drive device, thus resetting the first drive device and facilitating normal opening and closing operations of the switchgear. However, if an external fault occurs and the number of times the controller sends the first drive signal to the first drive device exceeds a threshold, the controller will send a second drive signal to the second drive device in addition to the first drive signal. In this case, the second drive device can drive the reset element, causing it to move from the first position to the second position. The handle will then be unable to drive the reset element through the operating mechanism to reset the first drive device, and the switchgear will remain in the open state. This configuration prevents repeated blind closing operations when an external fault has not been resolved, thus improving the service life of the switchgear.

[0015] In one possible implementation, after a failure of the photovoltaic module or its connecting lines causes the second drive device to disengage the reset member from the movement path from the first position to the second position, and the failure of the photovoltaic module or its connecting lines is eliminated, the second drive device is further used to release the drive of the reset member under the action of external force and reset it, so that the reset member is reset to the first position.

[0016] This application uses an external force to drive the reset component to reset, which can improve the degree of human intervention and ensure that professional maintenance personnel can confirm that the external fault has been eliminated before the reset component is driven to reset by external force, thus preventing the equipment from continuing to operate under external faults and causing secondary damage or expansion of the fault.

[0017] In one possible implementation, after a failure of the photovoltaic module or its connecting line causes the second drive device to disengage the reset member from the movement path from the first position to the second position, and the failure of the photovoltaic module or its connecting line is resolved, the controller is further configured to send a reset signal to the second drive device; the second drive device is further configured to release the drive of the reset member and reset it after receiving the reset signal, so that the reset member is reset to the first position.

[0018] This application uses an electrical control method to release the drive of the reset component so that the reset component can be reset. This can shorten the reset time of the switching device after the external fault is cleared, reduce labor and time costs, and facilitate rapid restoration in remote, dangerous or hard-to-reach installation locations.

[0019] In one possible implementation, the switching device further includes a second housing for housing the operating mechanism, the reset member, the first drive mechanism, and the second drive mechanism; a handle is located outside the second housing. The reset member has an oblong hole, and a connecting shaft is provided on the inner wall of the second housing, with one end of the connecting shaft away from the inner wall of the second housing extending into the oblong hole. The switching device also includes a reset spring, one end of which is fixed relative to the second housing, and the other end is connected to the reset member; when the operating mechanism drives the reset member to move from a first position to a second position, the reset spring stores energy; after the operating mechanism releases the drive on the reset member, the reset spring releases energy and drives the reset member to reset. When the second drive mechanism drives the reset member to disengage from the movement path from the first position to the second position, the reset spring stores energy; after the second drive mechanism resets and releases the drive on the reset member, the reset spring releases energy and drives the reset member to reset.

[0020] With the above-described configuration, when the reset member has a slotted hole and the switching device also includes a reset spring, after the operating mechanism releases the driving action on the reset member, the reset member can automatically reset through the energy release action of the reset spring, thereby preparing for the operating mechanism to drive the reset member to operate again. After the second driving device resets, the reset member can automatically reset under the energy release action of the reset spring, thereby preparing for the second driving device to drive the reset member to operate again.

[0021] In one possible implementation, the reset member includes a first portion and a second portion connected to the first portion; the first portion is located between a first driving device and a second driving device, and the second portion is located on the side of the first portion opposite to the first driving device. An oblong hole is provided in the second portion. An operating mechanism drives the reset member to slide within the second housing via the first portion, thereby causing the first portion to drive the first driving device to reset; the second driving device drives the reset member to rotate within the second housing via the second portion, thereby disengaging the first portion from its movement path from the first position to the second position.

[0022] This application uses the sliding (i.e., linear motion) of the reset element to drive the first drive device to reset, and utilizes the rotational motion of the reset element to disable the reset function. When the first drive device needs to reset, the linear drive of the reset element provides a direct and reliable thrust; when the first drive device does not need to reset, simply rotating the reset element by a certain angle completely disengages it from the contact path with the first drive device, thereby actively disabling the reset function of the reset element driving the first drive device. This design assigns two independent motion forms to the two operating modes of executing the first drive device reset and preventing the first drive device reset, enhancing the reliability of the switching device's movement.

[0023] In one possible implementation, the reset member includes a third part and a fourth part connected to the third part; the third part is located between the first and second driving devices, and the fourth part is located on the side of the third part facing away from the first driving device. An oblong hole is provided in the third part. An operating mechanism drives the reset member to rotate within the second housing via the third part, causing the third part to drive the first driving device to reset; the second driving device drives the reset member to slide within the second housing via the fourth part, causing the third part to disengage from its movement path from the first position to the second position.

[0024] This application uses a rotating reset member to drive the first drive device to reset, and utilizes the sliding of the reset member within the second housing to disable the reset function. When the first drive device needs to reset, the rotational drive can achieve the reset of the first drive device by rotating at a certain angle within a limited space, reducing the space requirement for the reset member's movement; when it is necessary to prevent reset, the reset member can be removed from the reset path (i.e., the movement path from the first position to the second position) by linear displacement, thereby interrupting the power transmission path. Removing the reset member from the reset path by linear movement reduces the risk of motion interference.

[0025] In one possible implementation, the operating mechanism includes a drive member, which has a first connecting portion, a second connecting portion, and an actuating portion; the first connecting portion is drivenly connected to a handle, the second connecting portion is drivenly connected to a moving contact, and the actuating portion is drivenly connected to a reset member. When the first drive device is activated, the handle acts on the first connecting portion to move the drive member, and the actuating portion drives the reset member to move from a first position to a second position, so that the reset member drives the first drive device to reset and the moving contact remains separated from the first and second stationary contacts.

[0026] With the above-described configuration, this application enables the drive member to move via a handle when the first drive device is reset, so that the drive member drives the moving contact to open or close with the first stationary contact and the second stationary contact via the second connecting part; when the first drive device is not reset, the drive member can be moved via a handle so that the drive member drives the reset member to move via the actuating part, thereby resetting the first drive device.

[0027] In one possible implementation, the operating mechanism includes a latch, a trip latch, and a transmission assembly; wherein the transmission assembly is tractively connected to a handle, a moving contact, a trip latch, and a reset member, respectively. The trip latch is tractively connected to the latch; when the latch and trip latch are engaged, the handle is used to rotate the moving contact of each switch body via the transmission assembly, causing the moving contact to contact or separate from the first and second stationary contacts; a first driving device is used to disengage the trip latch and the latch, and when the latch and trip latch are disengaged, the handle cannot tract the moving contact to contact or separate from the first and second stationary contacts via the transmission assembly. Upon receiving a first driving signal, the first driving device drives the latch and trip latch to disengage, causing the trip latch to move the moving contact via the transmission assembly to separate from the first and second stationary contacts, respectively; after the first driving device disengages the latch and trip latch, the handle is used to move the reset member from a first position to a second position via the transmission assembly, causing the reset member to drive the first driving device to reset and the latch and trip latch to engage.

[0028] With the above-described configuration, when the latch and trip latch are engaged, the drive handle moves, which in turn drives the transmission assembly to move the moving contact to open or close the circuit with the first and second stationary contacts. When the latch and trip latch are disengaged, the handle cannot open or close the circuit via the transmission assembly. After the latch and trip latch are disengaged, the handle can drive the reset member from the first position to the second position via the transmission assembly, thereby resetting the first drive device. It should be understood that the handle can drive the reset member via the transmission assembly to drive the first drive device only if the reset member is in the reset state.

[0029] In one possible implementation, the switching device further includes a second housing for housing the latch, the trip latch, the transmission assembly, the reset element, the first drive unit, and the second drive unit. A handle is located outside the second housing. The switching device also includes a pull rod rotatably connected to the second housing; the pull rod has a mating surface. When the mating surface abuts against the latch, the trip latch and the latch are engaged; after the first drive unit receives a first drive signal, the first drive unit drives the pull rod to rotate, causing the mating surface to disengage from the latch, thus disengaging the trip latch and the latch.

[0030] This application provides a traction rod, with its mating surface abutting against the latch. The traction rod and the trip latch can each apply force to the latch, keeping the latch, trip latch, and traction rod in the locked position, thus facilitating the normal opening and closing of the switchgear.

[0031] On the other hand, this application provides a switching device, which includes a handle, an operating mechanism, a plurality of stacked switch bodies, a reset member, a first driving device, and a second driving device. Each switch body includes a moving contact and a stationary contact. The moving contact rotates relative to a first housing of the switch body, while the stationary contact is fixed relative to the first housing. The operating mechanism is operatively connected to the handle, the moving contact, and the reset member. Both the first and second driving devices are operatively connected to the reset member, and the first driving device is also operatively connected to the operating mechanism. When the first driving device is reset, the handle is used to drive the moving contact of each switch body to rotate via the operating mechanism, so that the moving contact contacts or separates from the stationary contact. The first driving device is used to drive the operating mechanism to actuate upon receiving a first driving signal, so that the operating mechanism moves the moving contact to separate from the stationary contact. After the first driving device drives the operating mechanism to actuate, the handle is also used to drive the reset member from a first position to a second position via the operating mechanism, so that the reset member drives the first driving device to reset. The second driving device is used to drive the reset member to disengage from the first position to the second position on the movement path after receiving the second driving signal, while the first driving device remains in the unreset state and the moving contact remains separated from the stationary contact.

[0032] The switching device provided in this application, by providing a reset member that is driven and connected to both the operating mechanism and the first driving device, allows the reset member to move from a first position to a second position by turning the handle when the first driving device drives the operating mechanism to separate the moving contact from the stationary contact (i.e., the moving contact and stationary contact are open). This causes the reset member to act on the first driving device and reset it. After the first driving device is reset, moving the handle can drive the operating mechanism to move the moving contact to close (i.e., the moving contact and stationary contact are in contact) or open / close the circuit. This application also provides a second driving device that is driven and connected to the reset member. This second driving device can drive the reset member to move from the first position to the second position. In this case, if the handle is continued to be driven, the handle cannot drive the reset member to move via the operating mechanism, the first driving device cannot be reset and remains in an unreset state, and the operating mechanism cannot open or close the moving contact.

[0033] For example, when the switching device is used as a DC switch in a power converter, if an external fault occurs in the power converter, the controller of the power converter sends a first drive signal to the first drive device to control the operation of the first drive device. The first drive device drives the operating mechanism to operate, which can cause the operating mechanism to drive the moving contact to operate and open the circuit breaker with the stationary contact, thus realizing the opening operation caused by the external fault of the switching device. After the external fault occurs, the user can drive the operating mechanism to operate through the handle, so that the operating mechanism drives the reset member to move from the first position to the second position, so as to drive the first drive device to reset through the reset member. After the first drive device is reset, the user can drive the operating mechanism via the handle to open or close the moving and stationary contacts. If an internal fault occurs in the power converter, the power converter controller sends a first drive signal to the first drive device to control its operation, causing the moving and stationary contacts to open. Simultaneously, the power converter controller can also send a second drive signal to the second drive device to control its operation. The second drive device drives the reset element, causing it to move from the first position to the second position. In this case, the operating mechanism cannot drive the first drive device to reset via the reset element, and the first drive device remains in the unreset state. Therefore, the user cannot open or close the moving and stationary contacts by driving the operating mechanism via the handle. When the switching device provided in this application is applied to a power converter, it can prevent the switching device from closing when an internal fault occurs in the power converter, thus avoiding the expansion of the fault.

[0034] In one possible implementation, the second drive device is also used to release the drive of the reset member and reset it under the action of an external force, so that the reset member is reset to the first position.

[0035] The second driving device of this application releases the driving force on the reset element under external force, thereby resetting the reset element. Using external force to reset the reset element increases the degree of human intervention, ensuring that professional maintenance personnel can confirm that the fault has been eliminated before external force is applied to reset the element, preventing secondary damage or escalation of the fault due to equipment malfunction. Simultaneously, this human intervention method also avoids the reset element resetting when the fault has not been eliminated due to automatic restart caused by a control system malfunction, placing the final decision on restoring the switching device to normal operation in the hands of professional maintenance personnel, thereby improving the reliability of equipment operation.

[0036] In one possible implementation, the second drive device is further configured to release the drive of the reset member and reset it upon receiving a reset signal, so that the reset member is reset to the first position.

[0037] This application employs this method to release the drive of the reset component, thereby resetting it. This shortens the reset time of the switching device after a fault is cleared, reducing labor and time costs, and facilitating rapid recovery in remote, dangerous, or hard-to-reach installation locations. Furthermore, this method makes it easier to centrally manage and record the status of the fault recovery process, thus improving the overall intelligence level of operation and maintenance.

[0038] In one possible implementation, the switching device further includes a second housing for housing the operating mechanism, the reset member, the first drive mechanism, and the second drive mechanism. A handle is located outside the second housing. The reset member has an oblong hole, and a connecting shaft is provided on the inner wall of the second housing, with one end of the connecting shaft, away from the inner wall of the second housing, extending into the oblong hole. The switching device also includes a reset spring, one end of which is fixed relative to the second housing, and the other end connected to the reset member. When the operating mechanism drives the reset member to move from a first position to a second position, the reset spring stores energy; after the operating mechanism releases the drive on the reset member, the reset spring releases energy and causes the reset member to reset. When the second drive mechanism drives the reset member to disengage from the movement path from the first position to the second position, the reset spring stores energy; after the second drive mechanism resets and releases the drive on the reset member, the reset spring releases energy and causes the reset member to reset.

[0039] This application, by setting a reset spring and a reset member with a waist-shaped hole, allows the reset member to automatically reset under the energy release of the reset spring after the operating mechanism releases the driving action on the reset member, thus preparing for the next driving action of the reset member by the operating mechanism; after the second driving device resets, the reset member can automatically reset under the energy release of the reset spring, thus preparing for the next driving action of the reset member by the second driving device.

[0040] In one possible implementation, the reset member includes a first portion and a second portion connected to the first portion; the first portion is located between a first driving device and a second driving device, and the second portion is located on the side of the first portion opposite to the first driving device. An oblong hole is provided in the second portion; an operating mechanism drives the reset member to slide within a second housing via the first portion, thereby causing the first portion to drive the first driving device to reset; the second driving device drives the reset member to rotate within the second housing via the second portion, thereby disengaging the first portion from its movement path from the first position to the second position.

[0041] This application uses the sliding motion of a reset element to drive the first drive device to reset, while utilizing the rotational motion of the reset element to disable the reset function. When the first drive device needs to reset, the linear drive of the reset element provides a direct and reliable thrust; when the first drive device does not need to reset, simply rotating the reset element by a certain angle completely disengages it from the contact path with the first drive device, thereby actively disabling the reset function of the reset element driving the first drive device. This design assigns two independent motion forms to the two operating modes of executing the first drive device reset and preventing the first drive device reset, enhancing the reliability of the switching device's movement.

[0042] In one possible implementation, the reset member includes a third part and a fourth part connected to the third part; the third part is located between the first and second driving devices, and the fourth part is located on the side of the third part facing away from the first driving device. An oblong hole is provided in the third part. An operating mechanism drives the reset member to rotate within the second housing via the third part, causing the third part to drive the first driving device to reset; the second driving device drives the reset member to slide within the second housing via the fourth part, causing the third part to disengage from its movement path from the first position to the second position.

[0043] This application uses the rotation of a reset member to drive the first drive device to reset, while using the sliding of the reset member within the second housing to disable the reset function. When the first drive device needs to reset, the rotary drive can achieve the reset of the first drive device by rotating at a certain angle within a limited space, reducing the space requirement for the movement of the reset member; when it is necessary to prevent reset, the reset member can be removed from the reset path by linear displacement, thereby interrupting the power transmission path. Removing the reset member from the reset path by linear movement reduces the risk of motion interference.

[0044] In one possible implementation, the operating mechanism includes a drive member, which has a first connecting portion, a second connecting portion, and an actuating portion; the first connecting portion is drivenly connected to a handle, the second connecting portion is drivenly connected to a moving contact, and the actuating portion is drivenly connected to a reset member. When the first drive device is not reset, the handle acts on the first connecting portion to move the drive member, and the actuating portion drives the reset member to move from a first position to a second position, so that the reset member drives the first drive device to reset while the moving contact remains separated from the stationary contact.

[0045] This application provides a driving member having a first connecting part, a second connecting part, and an action part. The driving member is connected to a handle, a moving contact, and a reset member respectively. When the first driving device is reset, the driving member can be moved by the handle, so that the driving member drives the moving contact to open or close with the stationary contact through the second connecting part. When the first driving device is not reset, the driving member can be moved by the handle, so that the driving member drives the reset member to operate through the action part, thereby realizing the reset of the first driving device.

[0046] In one possible implementation, the operating mechanism includes a latch, a trip latch, and a transmission assembly. The transmission assembly is kinetically connected to a handle, a moving contact, a trip latch, and a reset element. The trip latch is kinetically connected to the latch; when the latch and trip latch are engaged, the handle drives the moving contact of each switch body to rotate via the transmission assembly, causing the moving contact to contact or separate from the stationary contact; a first drive device drives the trip latch and latch to disengage, and when the latch and trip latch are disengaged, the handle cannot drive the moving contact to contact or separate from the stationary contact via the transmission assembly. Upon receiving a first drive signal, the first drive device drives the latch and trip latch to disengage, causing the trip latch to drive the moving contact to move via the transmission assembly to separate from the stationary contact; after the first drive device drives the latch and trip latch to disengage, the handle drives the reset element from a first position to a second position via the transmission assembly, causing the reset element to drive the first drive device to reset and the latch and trip latch to engage.

[0047] With the above-described configuration, when the latch and trip latch are engaged, the drive handle moves, which in turn drives the transmission assembly to move the moving contact to open or close the circuit with the stationary contact. When the latch and trip latch are disengaged, the handle cannot open or close the circuit with the stationary contact via the transmission assembly. After the latch and trip latch are disengaged, the handle can drive the reset member from the first position to the second position via the transmission assembly, thereby resetting the first drive device. It should be understood that the handle can drive the reset member via the transmission assembly to drive the first drive device only if the reset member is in the reset state.

[0048] In one possible implementation, the switching device further includes a second housing for housing the latch, the trip latch, the transmission assembly, the reset element, the first drive unit, and the second drive unit, with the handle located outside the second housing. The switching device also includes a pull rod rotatably connected to the second housing; the pull rod has a mating surface; when the mating surface abuts against the latch, the trip latch and the latch are engaged; after the first drive unit receives a first drive signal, the first drive unit drives the pull rod to rotate, causing the mating surface to disengage from the latch, thus disengaging the trip latch and the latch.

[0049] This application provides a traction rod, with its mating surface abutting against the latch. The traction rod and the trip latch can each apply force to the latch, keeping the latch, trip latch, and traction rod in the locked position, thus facilitating the normal opening and closing of the switchgear. Attached Figure Description

[0050] Figure 1 This is a schematic diagram illustrating the application of the power converter in a photovoltaic power supply system according to an embodiment of this application.

[0051] Figure 2 This is a schematic diagram of the structure of the switching device provided in the embodiments of this application;

[0052] Figure 3 This is one of the structural schematic diagrams of the switching device provided in the embodiments of this application in the closed state;

[0053] Figure 4 A second schematic diagram of the switching device provided in the embodiment of this application in the closed state;

[0054] Figure 5 This is the third schematic diagram of the switching device in the closed state provided in the embodiments of this application;

[0055] Figure 6 Fourth schematic diagram of the switching device provided in the embodiment of this application in the closed state;

[0056] Figure 7 This is one of the structural schematic diagrams of the switching device provided in the embodiments of this application in a tripped state;

[0057] Figure 8 A second schematic diagram of the switching device provided in the embodiment of this application in a tripped state;

[0058] Figure 9 This is the third schematic diagram of the switching device in the tripped state provided in the embodiments of this application;

[0059] Figure 10 This is one of the structural schematic diagrams of the switching device provided in the embodiments of this application in the reset state;

[0060] Figure 11 This is a second schematic diagram of the switching device in the reset state provided in the embodiments of this application;

[0061] Figure 12 This is the third schematic diagram of the switching device in the reset state provided in the embodiments of this application;

[0062] Figure 13 One of the structural schematic diagrams of the switching device provided in the embodiments of this application in a state where it cannot be reset;

[0063] Figure 14 A second schematic diagram of the switching device provided in the embodiment of this application in a state where it cannot be reset;

[0064] Figure 15 The third schematic diagram shows the structure of the switching device provided in the embodiment of this application in a state where it cannot be reset.

[0065] Figure label:

[0066] 01-Photovoltaic power supply system; 100-Power converter; 10-Photovoltaic connector; 20-Switching device; 30-Power conversion circuit; 40-Grid-connected switch; 50-Controller; 200-Photovoltaic module;

[0067] 21-Handle;

[0068] 22-Operating mechanism; 221-Lock; 222-Jump lock; 2221-First tension spring; 223-Traction rod; 2231-Mating surface; 224-Transmission assembly; 2241-First connecting rod; 2242-Second connecting rod; 2243-Drive component; 22431-First connecting part; 22432-Second connecting part; 22433-Actuating part; 2244-Second tension spring; 2245-Third connecting rod; 2246-Fourth connecting rod; 2247-Crank; 2248-Output shaft; 225-Mounting plate; 2251-Arc groove;

[0069] 23-Switch body; 231-First housing; 232-Moving contact; 233-Stationary contact; 2331-First stationary contact; 2332-Second stationary contact;

[0070] 24 - First drive unit;

[0071] 251-Reset component; 2511-Oval hole; 2512-First part; 2513-Second part; 2514-Third part; 2515-Fourth part; 252-Reset spring;

[0072] 26 - Second drive unit;

[0073] 27-Second housing; 271-Connecting shaft. Detailed Implementation

[0074] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0075] The terms "first," "second," and similar terms used herein do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "one," and similar terms, do not indicate a quantity limitation, but rather indicate the presence of at least one. Furthermore, in the description of the embodiments in this application, unless otherwise stated, "multiple" means two or more.

[0076] The power converter 100 in this application can be either a photovoltaic inverter or a power conversion system (PCS). Unlike a photovoltaic inverter, the photovoltaic connector 10 in the power conversion system can be connected not only to the photovoltaic module 200 but also to the energy storage battery. Therefore, the power conversion system can not only convert DC power from the photovoltaic module 200 or the energy storage battery into AC power, but also rectify AC power from the grid into DC power to charge the energy storage battery. The following description uses the power converter 100 as a photovoltaic inverter as an example to illustrate one application scenario of the power converter 100.

[0077] Figure 1 For a schematic diagram illustrating the application of the power converter 100 provided in this application embodiment in the photovoltaic power supply system 01, please refer to... Figure 1 The photovoltaic power supply system 01 includes a power converter 100 and photovoltaic modules 200. The power converter 100 converts direct current (DC) from the photovoltaic modules 200 into alternating current (AC) and transmits the AC power to the grid or a load. For example, the power converter 100 includes multiple photovoltaic connectors 10, a switching device 20 (or DC switch), a power conversion circuit 30, DC buses Bus+ and Bus-, a grid-connected switch 40, and a controller 50.

[0078] The power conversion circuit 30 includes a DC / DC circuit and a DC / AC circuit. In some applications, the photovoltaic module 200 is connected to the photovoltaic connector 10 to transmit DC power to the DC / DC circuit via the switching device 20. The DC / DC circuit then transforms the DC power and transmits it to the DC / AC circuit via the DC bus. Subsequently, the DC / AC circuit converts the DC power into AC power and transmits it to the grid or load via the grid-connected switch 40.

[0079] The power converter 100 of this application will be illustrated below.

[0080] To facilitate understanding and explanation, before introducing the power converter 100 of this application, this application will first describe the specific structure of the switching device 20. It should be understood that the application of the switching device 20 as a DC switch in a photovoltaic inverter is only one example of the application scenario of the switching device 20, and is not a limitation on the application scenario of the switching device 20.

[0081] Figure 2 This is a schematic diagram of the structure of the switching device 20 provided in the embodiments of this application, with reference to... Figure 2 As shown, the switching device 20 includes a handle 21, an operating mechanism 22, multiple stacked switch bodies 23, and a first driving device 24. Figure 2 (Not shown in the image).

[0082] The multiple switch bodies 23, stacked on the same side of the operating mechanism 22, each include a first housing 231, a moving contact 232, and a stationary contact 233. The moving contact 232 is located inside the first housing 231 and can rotate relative to the first housing 231. A portion of the stationary contact 233 is located inside the first housing 231 and is fixed relative to the first housing 231. The moving contact 232 is drively connected to the operating mechanism 22, and the operation of the operating mechanism 22 can drive the moving contact 232 to move.

[0083] For example, the switching device 20 can be a multi-layered interlocking switch, meaning that the first driving device 24 can drive the moving and stationary contacts within multiple switch bodies 23 to interlock and separate or make contact, such as a DC rotary switch. When the switching device 20 is a DC rotary switch, such as Figure 2 As shown, Figure 2 The schematic diagram uses a DC rotary switch as an example for the switching device 20. The stationary contact 233 of the switch body 23 includes a first stationary contact 2331 and a second stationary contact 2332. When the switching device 20 is applied in the power converter 100, the first stationary contact 2331 of each switch body 23 is used to connect one or more parallel photovoltaic strings through the photovoltaic connector 10. One photovoltaic string includes multiple photovoltaic modules 200 connected in series. Figure 2 (Not shown in the image), the second stationary contact 2332 of each switch body 23 is used to connect to the power conversion circuit 30. In some possible cases, the stationary contact 233 of the switch body 23 may only include the first stationary contact 2331.

[0084] Handle 21 is connected to operating mechanism 22. When the first drive device 24 is reset (the first drive device 24 includes a device body and a trip lever, which can extend or retract relative to the device body; the first drive device 24 being in the reset state means that the trip lever of the first drive device 24 is retracted into the device body, and the first drive device 24 being in the unreset state means that the trip lever of the first drive device 24 extends out of the device body), handle 21 drives operating mechanism 22 to operate. Operating mechanism 22 drives moving contact 232 of switch body 23 to operate. When moving contact 232 operates to contact stationary contact 233, switch device 20 closes; when moving contact 232 operates to separate from stationary contact 233, switch device 20 opens. That is, when the first drive device 24 is in the reset state, handle 21 can drive operating mechanism 22 to operate, so that moving contact 232 contacts or separates from stationary contact 233, thereby realizing the closing or opening operation of switch device 20.

[0085] The first driving device 24 is connected to the operating mechanism 22. Upon receiving a first driving signal (which instructs the first driving device 24 to operate), the first driving device 24 drives the operating mechanism 22 to move the moving contact 232 to separate it from the stationary contact 233. For example, taking the switching device 20 in a power converter 100, when an internal or external fault occurs in the power converter 100, the controller 50 of the power converter 100 sends a first driving signal to the first driving device 24, causing the first driving device 24 to drive the operating mechanism 22 to perform the opening operation of the switching device 20.

[0086] Among them, internal faults of power converter 100 refer to faults in internal components or internal circuits of power converter 100, including but not limited to overvoltage faults, overcurrent faults, and breakdown faults. When such faults occur, they need to be repaired by professional maintenance personnel. If the switch device 20 is closed before the fault is repaired, the fault will be further aggravated. External faults of power converter 100 refer to faults caused by external environmental faults of power converter 100, including faults occurring at photovoltaic module 200 or the connection line of photovoltaic module 200. Such faults are generally caused by manual reverse connection of photovoltaic module 200. Therefore, when external faults occur in power converter 100, after manual repair, the switch device 20 can be manually closed to make power converter 100 work normally.

[0087] Figure 3 This is one of the structural schematic diagrams of the switching device 20 in the closed state provided in the embodiments of this application. Figure 4 This is the second schematic diagram of the switching device 20 in the closed state provided in the embodiments of this application. Figure 5This is the third schematic diagram of the switching device 20 in the closed state provided in the embodiments of this application, wherein... Figure 4 for Figure 3 The main view of the structure. Figure 5 for Figure 3 Cross-sectional view of the central structure. (Refer to reference...) Figures 2 to 5 As shown in this application, the switching device 20 further includes a reset member 251, which is connected to the operating mechanism 22 and the first driving device 24 respectively.

[0088] In this application, after the first driving device 24 receives the first driving signal, it drives the operating mechanism 22 to operate, causing the operating mechanism 22 to move the moving contact 232 to separate it from the stationary contact 233. The handle 21 is then used to drive the reset member 251 from the first position to the second position via the operating mechanism 22, so that the reset member 251 drives the first driving device 24 to reset. After the first driving device 24 resets, turning the handle 21 can drive the moving contact 232 and the stationary contact 233 to perform opening or closing operations via the operating mechanism 22.

[0089] Among them, such as Figure 4 and Figure 5 As shown, the first position of the reset member 251 is the reset position of the reset member 251, that is, when the reset member 251 is in the first position, the reset member 251 is reset; when the reset member 251 is in the second position, the reset member 251 has driven the first drive device 24 to reset, that is, when the reset member 251 is in the second position, the reset member 251 has driven the trip lever of the first drive device 24 to retract. The process of the reset member 251 moving from the first position to the second position is the process of the first drive device 24 switching from the non-reset state to the reset state.

[0090] like Figure 4 and Figure 5 As shown, the switching device 20 also includes a second driving device 26, which is connected to the reset member 251. The second driving device 26 is used to drive the reset member 251 to disengage or deviate from its movement path from the first position to the second position after receiving a second driving signal. The first driving device 24 remains in an unreset state, and the moving contact 232 ( Figure 4 and Figure 5 (Not shown in the image) Maintains contact 233 with stationary contact. Figure 4 and Figure 5 The separation state (not shown in the diagram). Similar to the first drive device 24, the second drive device 26 may also include a device body and a trip lever. The trip lever can extend or retract relative to the device body. The second drive device 26 being in the reset state means that the trip lever of the second drive device 26 is retracted into the device body; the second drive device 26 being in the unreset state means that the trip lever of the second drive device 26 extends out of the device body.

[0091] That is, the second driving device 26 can drive the reset member 251 to move, so that the reset member 251 moves from the first position to the second position. Thus, after the first driving device 24 receives the first driving signal and drives the operating mechanism 22 to move the moving contact 232 to separate it from the stationary contact 233, if the second driving device 26 moves and drives the reset member 251 to move, so that the reset member 251 moves from the first position to the second position, then if the operating mechanism 22 is moved by turning the handle 21, it cannot drive the reset member 251 from the first position to the second position, and the first driving device 24 cannot reset. Since the first driving device 24 cannot reset, when the handle 21 drives the operating mechanism 22, the operating mechanism 22 cannot open or close the moving contact 232 and the stationary contact 233.

[0092] In short, if the second drive device 26 is in the reset state, the handle 21 can drive the reset member 251 to move through the operating mechanism 22, so that the reset member 251 drives the first drive device 24 to reset; if the second drive device 26 is activated and drives the reset member 251 to move, the reset member 251 will deviate from the movement path from the first position to the second position, the reset member 251 cannot act on the first drive device 24, the first drive device 24 cannot be reset, and the switch device 20 cannot perform opening and closing operations.

[0093] The switching device 20 provided in this application, by providing a reset member 251 that is respectively connected to the operating mechanism 22 and the first driving device 24, allows the reset member 251 to move from a first position to a second position by turning the handle 21 when the first driving device 24 drives the operating mechanism 22 to open the moving contact 232 and the stationary contact 233. This causes the reset member 251 to act on the first driving device 24 and reset the first driving device 24. After the first driving device 24 is reset, moving the handle 21 can drive the operating mechanism 22 to move the moving contact 232 to open or close the circuit with the stationary contact 233. This application, by setting a second drive device 26 that is connected to the reset member 251, can drive the reset member 251 to move, so that the reset member 251 moves from the first position to the second position. At this time, if the handle 21 continues to move, the handle 21 will not be able to drive the reset member 251 to move through the operating mechanism 22. The first drive device 24 will not be able to reset and will remain in the unreset state. The operating mechanism 22 will also not be able to make the moving contact 232 and the stationary contact 233 open or close.

[0094] For example, when the switching device 20 is used as a DC switch in the power converter 100, if the power converter 100 experiences an external fault, the controller 50 of the power converter 100 sends a first drive signal to the first drive device 24 to control the operation of the first drive device 24. The first drive device 24 drives the operating mechanism 22 to operate, which enables the operating mechanism 22 to drive the moving contact 232 to operate and open the circuit with the stationary contact 233, thus realizing the opening operation caused by the external fault of the switching device 20. After the external fault occurs, the user can drive the operating mechanism 22 to operate through the handle 21, so that the operating mechanism 22 drives the reset member 251 to move from the first position to the second position, so as to drive the first drive device 24 to reset through the reset member 251. After the first drive device 24 is reset, the user can drive the operating mechanism 22 to perform the opening or closing operation of the moving contact 232 and the stationary contact 233 via the handle 21. If the power converter 100 has an internal fault, the controller 50 of the power converter 100 sends a first drive signal to the first drive device 24 to control the first drive device 24 to operate, so that the moving contact 232 and the stationary contact 233 are opened. At the same time, the controller 50 of the power converter 100 can also send a second drive signal to the second drive device 26 to control the second drive device 26 to operate. The second drive device 26 drives the reset member 251 to operate, so that the reset member 251 can move from the first position to the second position. At this time, the operating mechanism 22 cannot drive the first drive device 24 to reset via the reset member 251. The first drive device 24 remains in the unreset state. The user cannot perform the opening or closing operation of the moving contact 232 and the stationary contact 233 by driving the operating mechanism 22 via the handle 21. When the switching device 20 provided in this application is applied to the power converter 100, it can prevent the switching device 20 from closing when an internal fault occurs in the power converter 100, so as to avoid the fault from escalating.

[0095] Upon receiving the second drive signal, the second drive device 26 can operate and drive the reset member 251 to move from the first position to the second position. In some cases, the second drive device 26 can also reset and reset the reset member 251. For example, when the switching device 20 is applied in the power converter 100, the second drive device 26 can reset and reset the reset member 251 when an external fault or an internal fault is cleared. The reset of the second drive device 26 and the reset member 251 can be achieved in the following ways:

[0096] (1) Reset method one of the second drive device 26 and the reset member 251: The second drive device 26 is also used to release the drive of the reset member 251 and reset it under the action of external force, so that the reset member 251 is reset to the first position.

[0097] That is, the second drive device 26 can be reset under the action of external force, and after the second drive device 26 is reset, the reset piece 251 is also reset to the first position. For example, the user can use a tool to move the trip lever of the second drive device 26 so that the drive rod of the second drive device 26 retracts into the device body of the second drive device 26, and the reset piece 251 resets after losing the driving action of the second drive device 26.

[0098] After the reset member 251 is reset to the first position, the operating mechanism 22 is driven by the handle 21. The operating mechanism 22 can then act on the reset member 251 to move the reset member 251 from the first position to the second position, thereby resetting the first driving device 24.

[0099] For example, after the second drive device 26 is reset, the reset member 251 can automatically reset after losing the force of the second drive device 26, or it can be reset by external force.

[0100] The second driving device 26 of this application releases the driving force on the reset member 251 under external force, thereby resetting the reset member 251. Using external force to reset the reset member 251 increases the degree of human intervention, ensuring that professional maintenance personnel can confirm that the fault has been eliminated before resetting the reset member 251 by external force, preventing secondary damage or escalation of the fault due to equipment malfunction. Simultaneously, this human intervention also avoids the reset member 251 being reset when the fault has not been eliminated due to automatic restart caused by a control system malfunction, placing the final decision on restoring the switching device 20 to normal operation in the hands of professional maintenance personnel, thereby improving the reliability of equipment operation.

[0101] (2) Reset method two of the second drive device 26 and the reset member 251: The second drive device 26 is also used to release the drive of the reset member 251 and reset it after receiving the reset signal, so that the reset member 251 is reset to the first position.

[0102] That is, in this method, the second drive device 26 uses electrical signal control to reset and release the drive of the reset member 251 so that the reset member 251 is reset.

[0103] This application employs this method to release the drive of the reset component 251, thereby resetting it. This shortens the reset time of the switchgear 20 after a fault is cleared, reducing labor and time costs, and facilitating rapid recovery in remote, dangerous, or hard-to-reach installation locations. Furthermore, this method makes it easier to centrally manage and record the status of the fault recovery process, thus improving the overall intelligence level of operation and maintenance.

[0104] In one feasible approach, combining references Figure 2 and Figure 5As shown, the switching device 20 also includes a second housing 27, which houses the operating mechanism 22, the reset member 251, the first drive device 24, and the second drive device 26. A handle 21 is located outside the second housing 27; for example, the handle 21 is driveably connected to the operating mechanism 22 via an input shaft.

[0105] The reset component 251 has an oblong hole 2511, and the inner wall of the second housing 27 is provided with a connecting shaft 271. One end of the connecting shaft 271 away from the inner wall of the second housing 27 extends into the oblong hole 2511. That is, one end of the connecting shaft 271 is fixed to the inner wall of the second housing 27, and the other end extends into the oblong hole 2511.

[0106] The switching device 20 also includes a reset spring 252. One end of the reset spring 252 is fixed relative to the second housing 27 (for example, a pin is fixed to the second housing 27, and the reset spring 252 is fixed to the pin), and the other end is connected to the reset member 251. When the operating mechanism 22 drives the reset member 251 to move from the first position to the second position, the reset spring 252 stores energy; after the operating mechanism 22 releases the drive on the reset member 251, the reset spring 252 releases energy and drives the reset member 251 to reset. In this way, when the operating mechanism 22 releases the drive on the reset member 251, the reset member 251 can automatically reset under the release of energy of the reset spring 252, preparing for the next operation of the operating mechanism 22 to drive the reset member 251.

[0107] When the second drive device 26 drives the reset member 251 to disengage from the first position to the second position, the reset spring 252 stores energy. After the second drive device 26 resets and releases the drive on the reset member 251, the reset spring 252 releases energy and drives the reset member 251 to reset. Thus, when the second drive device 26 resets, the reset member 251 loses the force applied to it by the second drive device 26, and the reset member 251 can automatically reset under the release of energy from the reset spring 252, preparing for the next drive of the second drive device 26.

[0108] This application, by setting a reset spring 252 and a reset member 251 with a waist-shaped hole 2511, allows the reset member 251 to automatically reset under the energy release of the reset spring 252 after the operating mechanism 22 releases the driving action on the reset member 251, thus preparing for the next driving action of the operating mechanism 22 on the reset member 251; after the second driving device 26 resets, the reset member 251 can automatically reset under the energy release of the reset spring 252, thus preparing for the next driving action of the second driving device 26 on the reset member 251.

[0109] When the operating mechanism 22 drives the reset member 251 to move from the first position to the second position, the reset member 251 can perform linear motion (or sliding). When the second driving device 26 drives the reset member 251 to move away from the first position to the second position, the reset member 251 can perform rotational motion; or, when the operating mechanism 22 drives the reset member 251 to move from the first position to the second position, the reset member 251 can perform rotational motion. When the second driving device 26 drives the reset member 251 to move away from the first position to the second position, the reset member 251 can slide. This application does not impose specific limitations on the movement mode of the reset member 251 under different conditions. Those skilled in the art can set it according to actual needs. The following will describe the structure corresponding to the two movement modes of the reset member 251 by way of example.

[0110] (1) When the reset component 251 is reset by sliding the first driving device 24, and moves from the first position to the second position by rotational motion, the structure of the reset component 251 and its related components is as follows: (Refer to...) Figure 5 As shown, the reset member 251 includes a first portion 2512 and a second portion 2513 connected to the first portion 2512; the first portion 2512 is located between the first driving device 24 and the second driving device 26, and the second portion 2513 is located on the side of the first portion 2512 facing away from the first driving device 24. An oblong hole 2511 is provided in the second portion 2513. The operating mechanism 22 drives the reset member 251 to slide within the second housing 27 via the first portion 2512, so that the first portion 2512 drives the first driving device 24 to reset; the second driving device 26 drives the reset member 251 to rotate within the second housing 27 via the second portion 2513, so that the first portion 2512 disengages from the movement path from the first position to the second position.

[0111] The first part 2512 and the second part 2513 are relatively fixed. The first part 2512 and the second part 2513 can be an integral structural component or two parts.

[0112] For example, such as Figure 5 As shown, the length direction of the oblong hole 2511 is parallel to the direction from the side of the reset member 251 facing away from the first driving device 24 to the side of the reset member 251 close to the first driving device 24, corresponding to... Figure 5 The orientation shown is horizontal. The width of the oblong hole 2511 corresponds to... Figure 5 The orientation shown is the vertical direction.

[0113] The operating mechanism 22 acts on the first part 2512 to drive the reset member 251 to slide within the second housing 27. The first part 2512 gradually approaches the first driving device 24 and drives the trip lever of the first driving device 24 to retract, thus resetting the first driving device 24. The second driving device 26 acts on the second part 2513 to drive the reset member 251 to rotate within the second housing 27. The first part 2512 of the reset member 251 can disengage from the movement path from the first position to the second position. At this time, the operating mechanism 22 cannot drive the reset member 251 to move through the first part 2512.

[0114] This application uses the sliding of the reset member 251 to drive the first drive device 24 to reset, and utilizes the rotational movement of the reset member 251 to disable the reset function. When the first drive device 24 needs to be reset, the linear drive of the reset member 251 provides a direct and reliable thrust; when the first drive device 24 does not need to be reset, simply rotating the reset member 251 by a certain angle will completely disengage it from the contact path with the first drive device 24, thereby actively disabling the reset function of the reset member 251 driving the first drive device 24. This design assigns two independent motion forms to the two working modes of executing the reset of the first drive device 24 and preventing the first drive device 24 from being reset, thereby enhancing the reliability of the movement of the switching device 20.

[0115] (2) When the reset member 251 drives the first drive device 24 to reset through rotational motion, and moves from the first position to the second position by sliding away from the first position, the structure of the reset member 251 and its related components is as follows: Figure 6 This is the fourth schematic diagram of the switching device 20 in the closed state provided in the embodiments of this application, wherein... Figure 6 and Figure 5 The motion pattern differs from that of the reset component 251. (Refer to...) Figure 6 As shown, the reset member 251 includes a third part 2514 and a fourth part 2515 connected to the third part 2514; the third part 2514 is located between the first driving device 24 and the second driving device 26, and the fourth part 2515 is located on the side of the third part 2514 facing away from the first driving device 24. An oblong hole 2511 is provided in the third part 2514. The operating mechanism 22 drives the reset member 251 to rotate within the second housing 27 via the third part 2514, so that the third part 2514 drives the first driving device 24 to reset; the second driving device 26 drives the reset member 251 to slide within the second housing 27 via the fourth part 2515, so that the third part 2514 disengages from the movement path from the first position to the second position.

[0116] Among them, the third part 2514 and the fourth part 2515 are relatively fixed. The third part 2514 and the fourth part 2515 can be an integral structural component or two parts.

[0117] For example, such as Figure 6 As shown, the width direction of the oblong hole 2511 is parallel to the direction from the side of the reset member 251 facing away from the first driving device 24 to the side of the reset member 251 close to the first driving device 24, corresponding to... Figure 6 The orientation shown is horizontal. The length of the oblong hole 2511 corresponds to... Figure 6 The orientation shown is the vertical direction.

[0118] The operating mechanism 22 acts on the third part 2514 to drive the reset member 251 to rotate within the second housing 27. The third part 2514 gradually approaches the first driving device 24 and drives the trip lever of the first driving device 24 to retract, thus resetting the first driving device 24. The second driving device 26 acts on the fourth part 2515 to drive the reset member 251 to slide within the second housing 27. The first part 2512 of the reset member 251 can disengage from the movement path from the first position to the second position. At this time, the operating mechanism 22 cannot drive the reset member 251 to move through the third part 2514.

[0119] This application uses the rotation of the reset member 251 to drive the first drive device 24 to reset, while using the sliding of the reset member 251 within the second housing 27 to disable the reset function. When the first drive device 24 needs to be reset, the rotational drive can achieve the reset of the first drive device 24 by rotating at a certain angle within a limited space, reducing the space requirement for the movement of the reset member 251; when it is necessary to prevent reset, the reset member 251 can be removed from the reset path (i.e., the movement path from the first position to the second position) by linear displacement, thereby interrupting the power transmission path. Removing the reset member 251 from the reset path by linear movement reduces the risk of motion interference.

[0120] In one feasible approach, refer to Figure 4 and Figure 5 As shown, the operating mechanism 22 includes a drive member 2243, wherein the drive member 2243 has a first connecting portion 22431, a second connecting portion 22432, and an actuating portion 22433. For example, the first connecting portion 22431, the second connecting portion 22432, and the actuating portion 22433 are all part of the drive member 2243.

[0121] The first connecting part 22431 is driven to the handle 21, the second connecting part 22432 is driven to the moving contact 232, and the actuating part 22433 is driven to the reset member 251. Thus, when the first driving device 24 is in the reset state, the handle 21 can drive the first connecting part 22431 to actuate the driving member 2243. The actuation of the driving member 2243, in turn, drives the moving contact 232 to actuate via the second connecting part 22432, thereby realizing the opening or closing operation of the switching device 20. When the first driving device 24 is not in the reset state, the handle 21 acts on the first connecting part 22431 to move the driving member 2243. The driving member 2243 then drives the actuating part 22433 to actuate, causing the actuating part 22433 to drive the reset member 251 from the first position to the second position. Thus, the reset member 251 can drive the first driving device 24 to reset while the moving contact 232 remains separated from the stationary contact 233.

[0122] This application provides a drive member 2243 with a first connecting part 22431, a second connecting part 22432, and an action part 22433. The drive member 2243 is connected to the handle 21, the moving contact 232, and the reset member 251 respectively. When the first drive device 24 is reset, the handle 21 can drive the drive member 2243 to move, so that the drive member 2243 drives the moving contact 232 to move through the second connecting part 22432 to open or close with the stationary contact 233. When the first drive device 24 is not reset, the handle 21 can drive the drive member 2243 to move, so that the drive member 2243 drives the reset member 251 to move through the action part 22433, thereby realizing the reset of the first drive device 24.

[0123] The method described in this application involves the handle 21 driving the drive member 2243 in the operating mechanism 22 to move, which in turn drives the reset member 251 to move, thereby resetting the first driving device 24. It should be understood that the above method is only one implementation of resetting the first driving device 24. In other embodiments, the handle 21 may drive the reset member 251 through other components to reset the first driving device 24. In other words, the process of the handle 21 driving the reset member 251 to reset the first driving device 24 can be achieved not only through the operating mechanism 22. For example, the handle 21 can drive a slider to move, causing the slider to drive the reset member 251, thereby resetting the first driving device 24.

[0124] In one possible implementation, the operating mechanism 22 further includes a latch 221, a jumper 222, and a transmission assembly 224; wherein the transmission assembly 224 is pulsatorically connected to the handle 21, the moving contact 232, the jumper 222, and the reset member 251, respectively, and the jumper 222 is pulsatorically connected to the latch 221.

[0125] When latch 221 and trip latch 222 are engaged, handle 21 can drive the moving contact 232 of each switch body 23 to rotate via transmission assembly 224, so that the moving contact 232 contacts or separates from the stationary contact 233. When latch 221 and trip latch 222 are disengaged, handle 21 cannot drive the moving contact 232 of each switch body 23 to rotate via transmission assembly 224, so that the moving contact 232 contacts or separates from the stationary contact 233. In other words, when latch 221 and trip latch 222 are engaged, drive handle 21 can realize the normal opening and closing of switch device 20; when latch 221 and trip latch 222 are disengaged, drive handle 21 cannot realize the normal opening and closing of switch device 20.

[0126] The first driving device 24 can drive the release latch 222 and the locking latch 221 to disengage. For example, after receiving the first driving signal, the first driving device 24 causes its release lever to extend to drive the locking latch 221 and the release latch 222 to disengage.

[0127] When the first drive device 24 receives the first drive signal, after the drive latch 221 and the trip latch 222 disengage, the trip latch 222 can drive the moving contact 232 to move through the transmission component 224, so that the moving contact 232 separates from the stationary contact 233. This process is the tripping process of the switch device 20.

[0128] After the first drive device 24 disengages the latch 221 and the trip latch 222, or after the switch device 20 trips, the handle 21 can drive the reset member 251 from the first position to the second position via the transmission assembly 224, so that the reset member 251 drives the first drive device 24 to reset and the latch 221 and the trip latch 222 engage. That is, after tripping, after the first drive device 24 is reset by the handle 21, the latch 221 and the trip latch 222 can also engage together, at which point the switch device 20 can continue to perform normal opening and closing operations.

[0129] Furthermore, when the operating mechanism 22 of this application includes a driving member 2243, the driving member 2243 is part of the transmission assembly 224. That is, the transmission assembly 224 is used to drive the reset member 251 to actuate, so that the reset member 251 drives the first driving device 24 to reset.

[0130] For example, the latch 221 has a notch, and the snap fastener 222 has a hook-on portion. When the latch 221 and the snap fastener 222 are engaged, the hook-on portion of the snap fastener 222 hooks onto the notch of the latch 221; when the latch 221 and the snap fastener 222 are disengaged, the hook-on portion of the snap fastener 222 disengages from the notch of the latch 221.

[0131] In one possible implementation, the second housing 27 houses the latch 221, the snap latch 222, the transmission assembly 224, the reset member 251, the first drive unit 24, and the second drive unit 26; the handle 21 is located outside the second housing 27. Figure 5 As shown, the switching device 20 also includes a traction rod 223, which is rotatably connected to the second housing 27; the traction rod 223 has a mating surface 2231. When the mating surface 2231 abuts against the latch 221, the jump catch 222 and the latch 221 are engaged; after the first driving device 24 receives the first driving signal, the first driving device 24 drives the traction rod 223 to rotate so that the mating surface 2231 disengages from the latch 221, and the jump catch 222 and the latch 221 disengage.

[0132] That is, when the mating surface 2231 of the traction rod 223 abuts against the lock 221, the lock 221 and the jump buckle 222 are engaged. In other words, when the mating surface 2231 of the traction rod 223 abuts against the lock 221, the hooking part of the jump buckle 222 is hooked at the notch of the lock 221. The lock 221, the jump buckle 222 and the traction rod 223 work together to achieve mechanical balance.

[0133] For example, the trip latch 222 is rotatably connected to the second housing 27. A first tension spring 2221 is connected to the end of the trip latch 222 away from the latch 221, and the end of the first tension spring 2221 away from the trip latch 222 is fixed relative to the second housing 27. When the latch 221 and the trip latch 222 are engaged, the first tension spring 2221 is in a stored-energy state; when the latch 221 and the trip latch 222 are disengaged, the first tension spring 2221 releases energy and drives the trip latch 222 to rotate, causing the trip latch 222 to drive the moving contact 232 to open the circuit breaker via the transmission assembly 224.

[0134] Additionally, as an example, the operating mechanism 22 also includes a torsion spring, one end of which is connected to the traction rod 223, and the other end is fixed relative to the second housing 27. When the first drive device 24 drives the traction rod 223 to rotate, the torsion spring stores energy; after the first drive device 24 resets, it releases the drive on the traction rod 223. At this time, the traction rod 223 can reset under the energy release of the torsion spring, preparing for the re-engagement of the jump buckle 222 and the lock buckle 221.

[0135] This application provides a traction rod 223, with its mating surface 2231 abutting against the latch 221. The traction rod 223 and the trip latch 222 can apply force to the latch 221 respectively, so that the latch 221, the trip latch 222 and the traction rod 223 are kept in the locked position, which facilitates the normal opening and closing of the switch device 20.

[0136] For example, combined Figure 4 and Figure 5 As shown, the transmission assembly 224 includes a first connecting rod 2241, a second connecting rod 2242, a drive member 2243, a second tension spring 2244, a third connecting rod 2245, a fourth connecting rod 2246, and a crank 2247. The first connecting rod 2241 is rotatably connected within the second housing 27, with one end connected to the handle 21 (e.g., via an input shaft), and the other end connected to one end of the second connecting rod 2242. The second connecting rod 2242 is movably connected within the second housing 27, with its other end connected to the first connecting portion 22431 of the drive member 2243. The drive member 2243 is rotatably connected within the second housing 27, and its second connecting portion 22432 is connected to the connecting shaft 271 of the third connecting rod 2245 and the fourth connecting rod 2246 via the second tension spring 2244. In this configuration, one end of the third link 2245 is connected to the jumper 222, and the other end is connected to the fourth link 2246. The end of the fourth link 2246 away from the third link 2245 is connected to the crank 2247. The crank 2247 is rotatably connected within the second housing 27, and the other end of the crank 2247 is drive-connected to the output shaft 2248, which is drive-connected to the moving contact 232.

[0137] Additionally, the operating mechanism 22 may include a mounting frame formed by two opposing mounting plates 225. The handle 21, the first connecting rod 2241, the second connecting rod 2242, and the drive member 2243 are all located on the outside of the mounting frame, while the second tension spring 2244, the third connecting rod 2245, the fourth connecting rod 2246, and the crank 2247 are all located inside the mounting frame (i.e., between the two mounting plates 225). The mounting plate 225 may also be provided with an arc-shaped groove 2251, to which the crank 2247 is rotatably connected. The end of the crank 2247 connected to the output shaft 2248 can slide within the arc-shaped groove 2251. The arc-shaped groove 2251 can limit the rotation angle of the crank 2247, thereby improving the reliability of the operation of the switching device 20.

[0138] The transmission process of the switching device 20 of this application in the states of opening, closing and tripping will be described below.

[0139] Switching device 20 is in the closed state: combined Figures 3 to 5As shown, when the switch device 20 is in the closed state, the mating surface 2231 of the traction rod 223 abuts against the latch 221, the latch 221 and the trip latch 222 are engaged together, the trip latch 222, the latch 221 and the traction rod 223 are in a state of mechanical equilibrium, the first drive device 24 is in the reset state, the second drive device 26 is in the reset state, and the moving contact 232 ( Figures 3 to 5 (not shown in the image) and stationary contact 233 ( Figures 3 to 5 (Not shown in the image) Contact.

[0140] When the switching device 20 switches from the closed state to the open state, the drive handle 21 rotates counterclockwise, thereby causing the first link 2241 to rotate counterclockwise along with the handle 21. During the counterclockwise rotation of the first link 2241, the first link 2241 pushes the second link 2242 to swing counterclockwise, and the second link 2242 pushes one end of the drive member 2243, causing the drive member 2243 to rotate counterclockwise. During the counterclockwise rotation of the drive member 2243, the connection position between the second tension spring 2244 and the drive member 2243 (the position of the second connecting part 22432) moves from the right side of the third link 2245 to the left side of the third link 2245. As the connection between the second tension spring 2244 and the drive member 2243 moves from the right side of the third link 2245 to the left side of the third link 2245, the second tension spring 2244 applies a pulling force towards the upper left at the connection between the third link 2245 and the fourth link 2246, causing the third link 2245 to rotate clockwise and the fourth link 2246 to swing counterclockwise, and the connection between the third link 2245 and the fourth link 2246 to move towards the upper left. During the counterclockwise swing of the fourth link 2246, the fourth link 2246 pulls one end of the crank 2247, causing the crank 2247 to rotate counterclockwise relative to the second housing 27. The crank 2247 drives the output turntable (one end of the output shaft 2248 is fixed relative to the crank 2247 and the other end is fixed relative to the output turntable) to rotate counterclockwise through the output shaft 2248. This causes the output turntable to drive the moving contact 232 (the moving contact 232 is connected to the output turntable in a transmission) to rotate counterclockwise, so as to separate the moving contact 232 from the stationary contact 233. At this time, the switch device 20 is opened.

[0141] Switching device 20 switches from the closed state to the tripped state: Figure 7 This is one of the structural schematic diagrams of the switching device 20 provided in the embodiments of this application in a tripped state. Figure 8 This is the second schematic diagram of the switching device 20 in the tripped state provided in the embodiments of this application. Figure 9 This is the third schematic diagram of the switching device 20 in the tripped state provided in the embodiments of this application. The structure of the switching device 20 in the tripped state can be referred to in conjunction with the following references. Figures 7 to 9As shown. When the first drive device 24 receives the first drive signal, the release lever of the first drive device 24 pops out to the right. The release lever of the first drive device 24 drives the traction rod 223 to rotate counterclockwise. The mating surface 2231 of the traction rod 223 disengages from the latch 221. The force exerted by the traction rod 223 on the latch 221 decreases. The balance among the jump latch 222, the latch 221, and the traction rod 223 is broken. The latch 221 rotates counterclockwise. Under the release of energy from the first tension spring 2221, the jump latch 222 rotates clockwise and the hook part of the jump latch 222 disengages from the notch of the latch 221. The latch 221 and the jump latch 222 disengage. At the same time as the jump latch 222 rotates clockwise, the jump latch 222 drives the third connecting rod 2245 to swing clockwise. The third connecting rod 2245 drives the fourth connecting rod 2246 to swing counterclockwise. At this time, the crank 2247 rotates counterclockwise under the drive of the fourth connecting rod 2246. Figure 4 and Figure 5 The status shown has been switched to Figure 8 and Figure 9 As shown in the diagram. When crank 2247 rotates counterclockwise, it drives the output disc to rotate counterclockwise via output shaft 2248, thereby causing the output disc to drive the moving contact 232 ( Figure 4 , Figure 5 , Figure 8 and Figure 9 (Not shown) Rotate counterclockwise to realize the interaction between the moving contact 232 and the stationary contact 233. Figure 4 , Figure 5 , Figure 8 and Figure 9 (Not shown) Disconnection, switchgear 20 trips, such as Figure 8 and Figure 9 As shown.

[0142] Switching device 20 switches from tripped state to reset state: Figure 10 This is one of the structural schematic diagrams of the switching device 20 in the reset state provided in the embodiments of this application. Figure 11 This is the second schematic diagram of the switching device 20 in the reset state provided in the embodiments of this application. Figure 12 This is the third schematic diagram of the switching device 20 in the reset state provided in the embodiments of this application. The structure of the switching device 20 in the reset state can be referred to in conjunction with reference to... Figures 10 to 12As shown. When it is necessary to switch the switching device 20 from the tripped position to the reset position, the drive handle 21 rotates counterclockwise, and the handle 21 drives the first link 2241 to rotate counterclockwise as well. During the counterclockwise rotation of the first link 2241, the first link 2241 pushes the second link 2242 to swing counterclockwise, and the second link 2242 acts on the first connecting part 22431 of the drive member 2243 to make the drive member 2243 rotate counterclockwise. During the counterclockwise rotation of the drive member 2243, the acting part 22433 of the drive member 2243 acts on the reset member 251, driving the reset member 251 to move, so that the reset member 251 acts on the trip lever of the first drive device 24, thereby causing the trip lever of the first drive device 24 to retract, and the first drive device 24 to reset. After the first drive device 24 is reset, the force on the traction rod 223 is released. The traction rod 223 is reset under the release of energy of the torsion spring, which prepares for the re-engagement of the jump buckle 222 and the lock buckle 221.

[0143] Simultaneously, the drive component 2243, via the second tension spring 2244, drives the connection between the third link 2245 and the fourth link 2246 to move. The third link 2245 swings counterclockwise and drives the trip latch 222 to rotate counterclockwise, thereby causing the hook part of the trip latch 222 to re-hook onto the notch of the latch 221, and the latch 221 and the trip latch 222 are re-engaged. In this way, the switch device 20 switches from the tripped state to the reset state, as shown below. Figure 11 and Figure 12 As shown.

[0144] Switching device 20 switches from tripped state to unresettable state: Figure 13 This is one of the structural schematic diagrams of the switching device 20 provided in the embodiments of this application in a state where it cannot be reset. Figure 14 This is the second schematic diagram of the switching device 20 provided in the embodiments of this application in a state where it cannot be reset. Figure 15 This is the third schematic diagram of the switching device 20 in the non-reset state provided in the embodiments of this application. The structure of the switching device 20 in the non-reset state can be referred to in conjunction with the following. Figures 13 to 15 As shown. If the switching device 20 needs to switch from the tripped state to the unresettable state, the second drive device 26 receives the second drive signal and causes its trip lever to pop out. The trip lever of the second drive device 26 drives the reset member 251 to move, so that the reset member 251 is disengaged from the movement path from the first position to the second position. At this time, if the handle 21 is turned to drive the drive member 2243 to rotate, the drive member 2243 cannot act on the reset member 251, and the first drive device 24 cannot reset. The first drive device 24 remains in the unreset state, and the switching device 20 remains in the open state.

[0145] Since internal faults in the power converter 100 require professional maintenance personnel to troubleshoot, closing the switch 20 before the fault is cleared could further exacerbate the problem. However, some switching devices lack clear fault indication functions, making it difficult for users to accurately determine whether the fault is external or internal after the switch 20 trips. Repeated blind closing operations before the internal fault is cleared not only affect system recovery but may also worsen the fault and even cause more serious equipment damage. Therefore, the power converter 100 of this application sends a second drive signal to the second drive device 26 via the controller 50 when an internal fault occurs. This causes the first drive device 24 to operate simultaneously with the second drive device 26, and the second drive device 26 drives the reset member 251 to move from the first position to the second position. Thus, when an internal fault occurs, the power converter 100 cannot reset the first drive device 24 by turning the handle 21, preventing the switch 20 from closing and avoiding further fault escalation.

[0146] The control logic of the power converter 100 of this application will be described below.

[0147] The power converter 100 includes a switching device 20, a power conversion circuit 30, and a controller 50. The stationary contact 233 of the switching device 20 includes a first stationary contact 2331 and a second stationary contact 2332. The first stationary contact 2331 is used for electrical connection with the photovoltaic module 200, and the second stationary contact 2332 is used for electrical connection with the power conversion circuit 30. Thus, the switching device 20 can function as a DC switch in the power converter 100 to control the DC-side circuit switching.

[0148] In the event of a fault in the photovoltaic module 200 or its connecting lines, the controller 50 sends a first drive signal to the first drive device 24. Upon receiving the first drive signal, the first drive device 24 drives the operating mechanism 22 to move, causing the moving contact 232 to separate from the first stationary contact 2331 and the second stationary contact 2332, respectively. After the first drive device 24 drives the operating mechanism 22 to move, the handle 21 further drives the reset member 251 from a first position to a second position via the operating mechanism 22, thereby causing the reset member 251 to reset the first drive device 24.

[0149] That is, when a fault occurs in the photovoltaic module 200 or its connecting lines (hereinafter referred to as an external fault), the controller 50 can drive the first drive device 24 to extend its trip lever and drive the operating mechanism 22 to actuate, thereby driving the moving contact 232 to separate from the first stationary contact 2331 and the second stationary contact 2332, thus realizing the tripping action of the switch device 20. In the event of an external fault, the drive handle 21 actuates, and the handle 21 can drive the reset member 251 to actuate via the operating mechanism 22, thereby causing the reset member 251 to reset the first drive device 24. In short, when an external fault occurs, the switch device 20 will trip, but this tripping can be reset by turning the handle 21, and normal opening and closing operations can still be performed after reset.

[0150] In the event of a fault in the power converter 100 (hereinafter referred to as an internal fault), the controller 50 is used to send a first drive signal to the first drive device 24 and a second drive signal to the second drive device 26; the second drive device 26 is used to drive the reset member 251 to disengage from the first position to the second position on the movement path after receiving the second drive signal, the first drive device 24 remains in an unreset state and the moving contact 232 remains in a separated state from the first stationary contact 2331 and the second stationary contact 2332.

[0151] In other words, when an internal fault occurs, the first drive device 24 will trip the switch device 20, separating the moving contact 232 from the first stationary contact 2331 and the second stationary contact 2332. Simultaneously, the second drive device 26 will also actuate, driving the reset member 251 to deviate from its movement path from the first position to the second position. At this point, the rotating handle 21 will no longer act on the reset member 251, the first drive device 24 will fail to reset, and will remain in the unreset state, while the switch device 20 will remain in the open state.

[0152] The power converter 100 provided in this application adopts the above-described configuration. In the event of an external fault, the controller 50 sends a first drive signal to the first drive device 24 to control its operation. The first drive device 24 drives the operating mechanism 22, enabling the operating mechanism 22 to move the moving contact 232 and separate it from the first stationary contact 2331 and the second stationary contact 2332, thus achieving a tripping operation due to an external fault in the switching device 20. After an external fault occurs, the user can drive the operating mechanism 22 via the handle 21 to move the reset member 251 from the first position to the second position, thereby resetting the first drive device 24. After the first drive device 24 is reset, the user can drive the operating mechanism 22 via the handle 21 to perform a tripping or closing operation between the moving contact 232 and the first stationary contact 2331 and the second stationary contact 2332.

[0153] In the event of an internal fault, the controller 50 sends a first drive signal to the first drive device 24 to control its operation. Simultaneously, the controller 50 sends a second drive signal to the second drive device 26 to control its operation. The operation of the second drive device 26 drives the reset member 251 to move from the first position to the second position. At this time, the operating mechanism 22 cannot drive the first drive device 24 to reset via the reset member 251, and the first drive device 24 remains in an unreset state. The user cannot perform opening or closing operations by driving the operating mechanism 22 via the handle 21. The power converter 100 provided in this application can prevent the first drive device 24 from resetting in the event of an internal fault, thus preventing the switching device 20 from closing and avoiding further fault escalation.

[0154] When an internal fault occurs, this application can prevent the first drive device 24 from resetting; after the internal fault is cleared, this application can also reset the second drive device 26 and the reset element 251, in order to prepare for the reset element 251 to drive the first drive device 24 to reset. This application does not limit the specific implementation of resetting the second drive device 26 and the reset element 251; for example, two implementation methods will be described below by way of example.

[0155] (1) One way to reset the second drive device 26 and the reset member 251: When the internal fault is eliminated, the second drive device 26 is also used to release the drive of the reset member 251 and reset it under the action of external force, so that the reset member 251 is reset to the first position.

[0156] That is, the second drive device 26 can be reset under the action of external force, and after the second drive device 26 is reset, the reset member 251 is also reset to the first position. The specific means of resetting the second drive device 26 under the action of external force, as well as the action of the reset member 251 after reset, have been described and explained in detail in the structural section above, so they will not be repeated here.

[0157] This application employs an external force-driven reset mechanism 251, which increases the level of human intervention. This ensures that professional maintenance personnel can confirm that the internal fault has been eliminated before the reset mechanism 251 is reset by external force, preventing secondary damage or further damage caused by continued operation of the equipment under internal fault conditions. Simultaneously, this human intervention method avoids the need for reset operations when internal faults are not eliminated due to automatic restarts caused by control system malfunctions. The final decision on restoring the switching device 20 to normal operation is entrusted to professional maintenance personnel, thereby improving equipment operational reliability.

[0158] (2) Another way to reset the second drive device 26 and the reset member 251: When the internal fault is eliminated, the controller 50 is also used to send a reset signal to the second drive device 26; the second drive device 26 is also used to release the drive of the reset member 251 and reset it after receiving the reset signal, so that the reset member 251 is reset to the first position.

[0159] That is, in this method, the second drive device 26 uses electrical signal control to reset and release the drive of the reset member 251, so that the reset member 251 is reset.

[0160] This application employs an electrical control method to release the drive of the reset element 251, thereby resetting it. This shortens the reset time of the switching device 20 after an internal fault is cleared, reducing labor and time costs, and facilitating rapid recovery in remote, dangerous, or hard-to-reach installation locations. Furthermore, this control method makes it easier to centrally manage and record the status of the fault recovery process, thus improving the overall intelligence level of operation and maintenance.

[0161] Since the first drive device 24 can be reset by turning the handle 21 when an external fault occurs, normal opening and closing operations can be performed after the first drive device 24 is reset. However, if multiple blind closing operations occur while the external fault remains unresolved for a long time, it may damage the switch device 20 and also lead to the expansion of the fault. To improve this problem, for example, in the event of an external fault and the number of times the controller 50 sends the first drive signal to the first drive device 24 exceeds a threshold, the controller 50 also sends a second drive signal to the second drive device 26. That is, in the event of an external fault and the number of times the controller 50 sends the first drive signal to the first drive device 24 exceeds the threshold, the controller 50 sends a second drive signal to the second drive device 26 in addition to sending the first drive signal to the first drive device 24.

[0162] For example, if the number of times the controller 50 sends the first drive signal to the first drive device 24 exceeds a threshold, the threshold can be the total number of times within a preset time period. For example, the threshold could be 3 times, 5 times, 8 times, or 10 times. The preset time period could be 1 minute, 3 minutes, 5 minutes, or 10 minutes.

[0163] When the number of times the controller 50 sends the first drive signal to the first drive device 24 exceeds the number threshold, it indicates that the switch device 20 has undergone multiple manual reset actions without the external fault being eliminated.

[0164] In the event of an external fault and if the number of times the controller 50 sends the first drive signal to the first drive device 24 exceeds a threshold, the controller 50 also sends a second drive signal to the second drive device 26. Thus, after an external fault causes a trip, the user can manually turn the handle 21 to drive the operating mechanism 22, causing the operating mechanism 22 to drive the reset member 251 to act on the first drive device 24, thereby resetting the first drive device 24 and facilitating normal opening and closing operations of the switchgear 20. However, if an external fault occurs and the number of times the controller 50 sends the first drive signal to the first drive device 24 exceeds a threshold, the controller 50 will send a second drive signal to the second drive device 26 in addition to the first drive signal to the first drive device 24. In this case, the second drive device 26 can drive the reset member 251, causing the reset member 251 to move from the first position to the second position. The handle 21 will then be unable to drive the reset member 251 through the operating mechanism 22 to reset the first drive device 24, and the switchgear 20 will remain in the open state. This application adopts this setting method, which can prevent multiple blind closing operations when external faults have not been eliminated, and can improve the service life of the switch device 20.

[0165] If the first drive device 24 is locked in an unreset state due to multiple closing operations while the external fault has not been eliminated, and if the external fault has been eliminated, this application can also reset the second drive device 26 and the reset member 251, so as to prepare for the reset member 251 to drive the first drive device 24 to reset.

[0166] In the case where the first drive device 24 is locked in an unreset state due to multiple closing operations while the external fault has not been eliminated, the reset method of the second drive device 26 and the reset component 251 is the same as the reset method after the internal fault has been eliminated, that is, it can be achieved in the following two ways.

[0167] (1) One way to reset the second drive device 26 and the reset member 251: After an external fault causes the second drive device 26 to drive the reset member 251 to disengage from the movement path from the first position to the second position, the second drive device 26 is also used to release the drive of the reset member 251 and reset it under the action of external force, so that the reset member 251 is reset to the first position.

[0168] The reset method has been described in detail above and will not be repeated here. Using external force to drive the reset component 251 to reset can improve the degree of human intervention, ensuring that professional maintenance personnel can confirm that the external fault has been eliminated before driving the reset component 251 to reset by external force, thus preventing the equipment from continuing to operate under external faults and causing secondary damage or expansion of the fault.

[0169] (2) Another way to reset the second drive device 26 and the reset member 251: After an external fault causes the second drive device 26 to drive the reset member 251 to disengage from the movement path from the first position to the second position, the controller 50 is also used to send a reset signal to the second drive device 26 when the external fault is eliminated; the second drive device 26 is also used to release the drive of the reset member 251 and reset it after receiving the reset signal, so that the reset member 251 is reset to the first position.

[0170] The reset method has been described in detail above and will not be repeated here. This application uses an electrical control method to release the drive of the reset element 251 to reset the reset element 251, which can shorten the reset time of the switching device 20 after the external fault is cleared, reduce labor and time costs, and facilitate rapid restoration in remote, dangerous or hard-to-reach installation locations.

[0171] In addition, when the reset member 251 has an oblong hole 2511 and the switching device 20 also includes a reset spring 252, after the operating mechanism 22 releases the driving action on the reset member 251, the reset member 251 can automatically reset through the energy release action of the reset spring 252, thereby preparing for the operating mechanism 22 to drive the reset member 251 to operate again.

[0172] Whether the first drive device 24 is locked in the unreset state due to an external fault or an internal fault, when the reset member 251 has an oblong hole 2511 and the switching device 20 also includes a reset spring 252, after the second drive device 26 is reset, the reset member 251 can automatically reset under the release of energy by the reset spring 252, thereby preparing for the second drive device 26 to drive the reset member 251 to operate again.

[0173] The first driving device 24 drives the operating mechanism 22 to trip the circuit breaker. After tripping, the operating mechanism 22 is driven by the handle 21 to reset the circuit breaker. After tripping, the first driving device 24 is kept in the unreset state. The second driving device 26 releases the driving force on the reset member 251. The reset member 251 drives the first driving device 24 to reset, or the reset member 251 moves from the first position to the second position. All of these can be referred to in the previous text and will not be repeated here.

[0174] The control principle of the power converter 100 of this application will be introduced below in conjunction with the structure of the switching device 20.

[0175] When an external fault occurs, the switching device 20 of the power converter 100 switches from the closed state to the tripped state. When an external fault occurs in the power converter 100, the controller 50 sends a first drive signal to the first drive device 24, such as... Figure 8 and Figure 9 As shown, the release lever of the first drive device 24 pops out to the right, driving the traction rod 223 to rotate counterclockwise. The mating surface 2231 of the traction rod 223 disengages from the latch 221, reducing the force exerted by the traction rod 223 on the latch 221. The balance among the jump latch 222, latch 221, and traction rod 223 is broken, causing the latch 221 to rotate counterclockwise. Under the release of energy from the first tension spring 2221, the jump latch 222 rotates clockwise, and the hook part of the jump latch 222 disengages from the notch of the latch 221, thus separating the latch 221 from the jump latch 222. Simultaneously with the clockwise rotation of the jump latch 222, it drives the third connecting rod 2245 to swing clockwise, which in turn drives the fourth connecting rod 2246 to swing counterclockwise. At this time, the crank 2247 rotates counterclockwise under the drive of the fourth connecting rod 2246, and the switching device 20... Figure 4 and Figure 5 The status shown has been switched to Figure 8 and Figure 9 As shown in the diagram. When crank 2247 rotates counterclockwise, it drives the output disc to rotate counterclockwise via output shaft 2248, thereby causing the output disc to drive the moving contact 232 ( Figure 4 , Figure 5 , Figure 8 and Figure 9 (Not shown) Rotate counterclockwise to realize the interaction between the moving contact 232 and the first stationary contact 2331 and the second stationary contact 2332 (not shown). Figure 4 , Figure 5 , Figure 8 and Figure 9 (Not shown) separation, switchgear 20 trips, such as Figure 8 and Figure 9 As shown.

[0176] When an external fault occurs, the switchgear 20 switches from the tripped state to the reset state. To switch the switchgear 20 from the tripped position to the reset state, the user manually drives the handle 21 counterclockwise. The handle 21 drives the first link 2241 to rotate counterclockwise. During the counterclockwise rotation of the first link 2241, it pushes the second link 2242 to swing counterclockwise. The second link 2242 acts on the first connecting part 22431 of the drive member 2243, causing the drive member 2243 to rotate counterclockwise. During the counterclockwise rotation of the drive member 2243, the acting part 22433 of the drive member 2243 acts on the reset member 251, driving the reset member 251 to move. This causes the reset member 251 to act on the trip lever of the first drive device 24, thereby causing the trip lever of the first drive device 24 to retract, and the first drive device 24 to reset. After the first drive device 24 is reset, the force on the traction rod 223 is released. The traction rod 223 is reset under the release of energy of the torsion spring, which prepares for the re-engagement of the jump buckle 222 and the lock buckle 221.

[0177] Simultaneously, the drive component 2243, via the second tension spring 2244, drives the connection between the third link 2245 and the fourth link 2246 to move. The third link 2245 swings counterclockwise and drives the trip latch 222 to rotate counterclockwise, thereby causing the hook part of the trip latch 222 to re-hook onto the notch of the latch 221, and the latch 221 and the trip latch 222 are re-engaged. In this way, the switch device 20 switches from the tripped state to the reset state, as shown below. Figure 11 and Figure 12 As shown.

[0178] When the power converter 100 experiences an external fault and the number of times the controller 50 sends the first drive signal to the first drive device 24 exceeds a threshold, or when an internal fault occurs, the switch device 20 switches from a tripped state to a non-resettable state: the controller 50 sends a first drive signal to the first drive device 24 and a second drive signal to the second drive device 26. The first drive device 24 receives the first drive signal and causes its trip lever to pop out, disengaging the latch 221 and the trip latch 222, thus tripping the switch device 20 (details described above). The second drive device 26 receives the second drive signal and causes its trip lever to pop out. The trip lever of the second drive device 26 drives the reset member 251 to move, causing the reset member 251 to disengage from the movement path from the first position to the second position. At this time, if the handle 21 is turned to drive the drive member 2243 to rotate, the drive member 2243 cannot act on the reset member 251, and the first drive device 24 cannot reset, remaining in the unreset state, while the switch device 20 remains in the tripped state.

[0179] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples. The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A power converter, characterized by, It includes a switching device, a power conversion circuit, and a controller; wherein the switching device includes a handle, an operating mechanism, multiple stacked switch bodies, a reset component, a first driving device, and a second driving device; The switch body includes a moving contact, a first stationary contact, and a second stationary contact. The moving contact rotates relative to the first housing of the switch body, while the first and second stationary contacts are fixed relative to the first housing. The first stationary contact is used for electrical connection with the photovoltaic module, and the second stationary contact is used for electrical connection with the power conversion circuit. The operating mechanism is respectively connected to the handle, the moving contact and the reset component; Both the first driving device and the second driving device are connected to the reset member in a transmission manner. The first driving device is also connected to the operating mechanism in a transmission manner. When the first driving device is reset, the handle is used to drive the moving contact of each switch body to rotate through the operating mechanism, so that the moving contact contacts or separates from the first stationary contact and the second stationary contact. In the event of a fault in the photovoltaic module or its connection line, the controller is configured to send a first drive signal to the first drive device; the first drive device is configured to drive the operating mechanism to move after receiving the first drive signal, so that the operating mechanism drives the moving contact to separate from the first stationary contact and the second stationary contact respectively; after the first drive device drives the operating mechanism to move, the handle is further configured to drive the reset member from the first position to the second position through the operating mechanism, so that the reset member drives the first drive device to reset; In the event of a power converter failure, the controller is configured to send a first drive signal to the first drive device and a second drive signal to the second drive device; the second drive device is configured to drive the reset member to disengage from the first position to the second position on the movement path after receiving the second drive signal, the first drive device remains in an unreset state and the moving contact remains separated from the first stationary contact and the second stationary contact.

2. The power converter according to claim 1, characterized in that, When the fault of the power converter is eliminated, the second drive device is also used to release the drive of the reset member and reset it under the action of external force, so that the reset member is reset to the first position.

3. The power converter according to claim 1, characterized in that, If the fault in the power converter is cleared, the controller is also configured to send a reset signal to the second drive device; The second driving device is further configured to release the driving of the reset member and reset it after receiving the reset signal, so that the reset member is reset to the first position.

4. The power converter according to any one of claims 1-3, characterized in that, If the photovoltaic module or its connection line fails and the number of times the controller sends the first drive signal to the first drive device exceeds a threshold, the controller is also used to send a second drive signal to the second drive device.

5. The power converter according to claim 4, characterized in that, After a fault occurs in the photovoltaic module or its connecting line, causing the second driving device to disengage the reset member from the first position to the second position along its movement path, if the fault in the photovoltaic module or its connecting line is eliminated, the second driving device is further configured to release the drive of the reset member under external force and reset it, so that the reset member is reset to the first position.

6. The power converter according to claim 4, characterized in that, After a fault occurs in the photovoltaic module or its connecting line, causing the second drive device to disengage the reset member from the first position to the second position along its movement path, and the fault in the photovoltaic module or its connecting line is eliminated, the controller is also used to send a reset signal to the second drive device. The second driving device is further configured to release the driving of the reset member and reset it after receiving the reset signal, so that the reset member is reset to the first position.

7. The power converter according to any one of claims 1-6, characterized in that, The switching device further includes a second housing for housing the operating mechanism, the reset member, the first driving device, and the second driving device; The handle is located outside the second housing; The reset component has an oblong hole, and the inner wall of the second housing is provided with a connecting shaft, with one end of the connecting shaft away from the inner wall of the second housing extending into the oblong hole; The switching device further includes a reset spring, one end of which is fixed relative to the second housing and the other end is connected to the reset member; when the operating mechanism drives the reset member to move from the first position to the second position, the reset spring stores energy; after the operating mechanism releases the drive on the reset member, the reset spring releases energy and drives the reset member to reset. When the second driving device drives the reset member to disengage from the first position to the second position along its movement path, the reset spring stores energy. After the second driving device resets and releases the drive to the reset member, the reset spring releases energy and drives the reset member to reset.

8. The power converter according to claim 7, characterized in that, The reset component includes a first part and a second part connected to the first part; the first part is located between the first driving device and the second driving device, and the second part is located on the side of the first part away from the first driving device. The waist-shaped hole is located in the second part; The operating mechanism drives the reset member to slide within the second housing via the first part, so that the first part drives the first driving device to reset. The second driving device drives the reset member to rotate within the second housing via the second part, so that the first part disengages from the movement path from the first position to the second position.

9. The power converter according to claim 7, characterized in that, The reset component includes a third part and a fourth part connected to the third part; the third part is located between the first driving device and the second driving device, and the fourth part is located on the side of the third part opposite to the first driving device; The waist-shaped hole is located in the third part; The operating mechanism drives the reset member to rotate within the second housing via the third part, so that the third part drives the first driving device to reset. The second driving device drives the reset member to slide within the second housing via the fourth part, so that the third part disengages from the movement path from the first position to the second position.

10. The power converter according to any one of claims 1-9, characterized in that, The operating mechanism includes a driving component, wherein... The driving component has a first connecting part, a second connecting part, and an action part; the first connecting part is throttle-connected to the handle, the second connecting part is throttle-connected to the moving contact, and the action part is throttle-connected to the reset component. If the first driving device is not reset, the handle acts on the first connecting part to move the driving member. The actuating part drives the reset member to move from the first position to the second position, so that the reset member drives the first driving device to reset and the moving contact remains separated from the first stationary contact and the second stationary contact.

11. The power converter according to any one of claims 1-10, characterized in that, The operating mechanism includes a latch, a jump catch, and a transmission assembly; wherein... The transmission components are respectively connected to the handle, the moving contact, the jumper, and the reset component; The jump buckle is connected to the latch in a transmission manner; when the latch and the jump buckle are engaged, the handle is used to drive the moving contact of each switch body to rotate through the transmission assembly, so that the moving contact contacts or separates from the first stationary contact and the second stationary contact; the first driving device is used to drive the jump buckle and the latch to disengage, and when the latch and the jump buckle are disengaged, the handle cannot drive the moving contact to contact or separate from the first stationary contact and the second stationary contact through the transmission assembly; When the first driving device receives the first driving signal, it drives the latch and the jumper to disengage, so that the jumper drives the moving contact to move through the transmission assembly to separate from the first stationary contact and the second stationary contact respectively; after the first driving device drives the latch and the jumper to disengage, the handle is used to drive the reset member to move from the first position to the second position through the transmission assembly, so that the reset member drives the first driving device to reset and the latch and the jumper are engaged.

12. The power converter according to claim 11, characterized in that, The switching device further includes a second housing for housing the latch, the jumper, the transmission assembly, the reset member, the first drive device, and the second drive device; The handle is located outside the second housing; The switching device further includes a traction rod, which is rotatably connected to the second housing; the traction rod has a mating surface. When the mating surface abuts against the latch, the snap fastener and the latch are engaged; After receiving the first driving signal, the first driving device drives the traction rod to rotate so that the mating surface disengages from the latch, and the buckle and the latch disengage.

13. A switching device, characterized in that, It includes a handle, an operating mechanism, multiple stacked switch bodies, a reset component, a first drive device, and a second drive device; wherein, The switch body includes a moving contact and a stationary contact. The moving contact rotates relative to the first housing of the switch body, and the stationary contact is fixed relative to the first housing. The operating mechanism is respectively connected to the handle, the moving contact and the reset component; Both the first driving device and the second driving device are connected to the reset member in a transmission manner. The first driving device is also connected to the operating mechanism in a transmission manner. When the first driving device is reset, the handle is used to drive the moving contact of each switch body to rotate through the operating mechanism, so that the moving contact contacts or separates from the stationary contact. The first driving device is used to drive the operating mechanism to move after receiving the first driving signal, so that the operating mechanism drives the moving contact to move and separate from the stationary contact; after the first driving device drives the operating mechanism to move, the handle is also used to drive the reset member from the first position to the second position through the operating mechanism, so that the reset member drives the first driving device to reset. The second driving device is used to drive the reset member to disengage from the first position to the second position on the motion path after receiving the second driving signal, while the first driving device remains in an unreset state and the moving contact remains separated from the stationary contact.

14. The switching device according to claim 13, characterized in that, The second driving device is also used to release the driving force on the reset member and reset it under the action of external force, so that the reset member is reset to the first position.

15. The switching device according to claim 13, characterized in that, The second driving device is further configured to release the driving of the reset member and reset it after receiving a reset signal, so that the reset member is reset to the first position.

16. The switching device according to any one of claims 13-15, characterized in that, The switching device further includes a second housing for housing the operating mechanism, the reset member, the first driving device, and the second driving device; The handle is located outside the second housing; The reset component has an oblong hole, and the inner wall of the second housing is provided with a connecting shaft, with one end of the connecting shaft away from the inner wall of the second housing extending into the oblong hole; The switching device further includes a reset spring, one end of which is fixed relative to the second housing and the other end is connected to the reset member; when the operating mechanism drives the reset member to move from the first position to the second position, the reset spring stores energy; after the operating mechanism releases the drive on the reset member, the reset spring releases energy and drives the reset member to reset. When the second driving device drives the reset member to disengage from the first position to the second position along its movement path, the reset spring stores energy. After the second driving device resets and releases the drive to the reset member, the reset spring releases energy and drives the reset member to reset.

17. The switching device according to claim 16, characterized in that, The reset component includes a first part and a second part connected to the first part; the first part is located between the first driving device and the second driving device, and the second part is located on the side of the first part away from the first driving device. The waist-shaped hole is located in the second part; The operating mechanism drives the reset member to slide within the second housing via the first part, so that the first part drives the first driving device to reset. The second driving device drives the reset member to rotate within the second housing via the second part, so that the first part disengages from the movement path from the first position to the second position.

18. The switching device according to claim 16, characterized in that, The reset component includes a third part and a fourth part connected to the third part; the third part is located between the first driving device and the second driving device, and the fourth part is located on the side of the third part opposite to the first driving device; The waist-shaped hole is located in the third part; The operating mechanism drives the reset member to rotate within the second housing via the third part, so that the third part drives the first driving device to reset. The second driving device drives the reset member to slide within the second housing via the fourth part, so that the third part disengages from the movement path from the first position to the second position.

19. The switching device according to any one of claims 13-18, characterized in that, The operating mechanism includes a driving component, wherein... The driving component has a first connecting part, a second connecting part, and an action part; the first connecting part is throttle-connected to the handle, the second connecting part is throttle-connected to the moving contact, and the action part is throttle-connected to the reset component. If the first driving device is not reset, the handle acts on the first connecting part to move the driving member. The actuating part drives the reset member to move from the first position to the second position, so that the reset member drives the first driving device to reset and the moving contact remains separated from the stationary contact.

20. The switching device according to any one of claims 13-19, characterized in that, The operating mechanism includes a latch, a jump catch, and a transmission assembly; wherein... The transmission components are respectively connected to the handle, the moving contact, the jumper, and the reset component; The jump buckle is connected to the latch in a transmission manner; when the latch and the jump buckle are engaged, the handle is used to drive the moving contact of each switch body to rotate through the transmission assembly, so that the moving contact contacts or separates from the stationary contact; the first driving device is used to drive the jump buckle and the latch to disengage, and when the latch and the jump buckle are disengaged, the handle cannot drive the moving contact to contact or separate from the stationary contact through the transmission assembly; When the first driving device receives the first driving signal, it drives the latch and the jumper to disengage, so that the jumper drives the moving contact to move through the transmission assembly to separate from the stationary contact; after the first driving device drives the latch and the jumper to disengage, the handle is used to drive the reset member from the first position to the second position through the transmission assembly, so that the reset member drives the first driving device to reset and the latch and the jumper are engaged.

21. The switching device according to claim 20, characterized in that, The switching device further includes a second housing for housing the latch, the jumper, the transmission assembly, the reset member, the first drive device, and the second drive device; The handle is located outside the second housing; The switching device further includes a traction rod, which is rotatably connected to the second housing; the traction rod has a mating surface. When the mating surface abuts against the latch, the snap fastener and the latch are engaged; After receiving the first driving signal, the first driving device drives the traction rod to rotate so that the mating surface disengages from the latch, and the buckle and the latch disengage.

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