inverter

Abstract

Provided in the present application is an inverter. The inverter comprises an input end, a direct-current (DC) switch, a plurality of DC / DC converters, direct-current buses, a DC / AC converter, a controller and an output end, wherein the DC switch comprises an operating handle, an operating mechanism, a moving contact, a fixed contact and a first drive apparatus, and the operating mechanism comprises a trip latch component and a latch component; input ends of the plurality of DC / DC converters are connected to the input end of the inverter by means of the DC switch; when a fault occurs in the inverter, the controller sends a first drive signal to the first drive apparatus; upon receiving the first drive signal, the first drive apparatus drives a moving component in the first drive apparatus, so as to drive the latch component to disengage from the trip latch component and to cause the moving contact to separate from the fixed contact; and when the trip latch component is disengaged from the latch component, the operating handle cannot drive the moving contact to be in contact with or separated from the fixed contact. Therefore, the spread of a fault due to the fact that a DC switch is manually turned on when the fault still exists in an inverter can be avoided.

Description

Inverter

[0001] The present application claims priority to the Chinese patent application No. 202411053745.4, filed on July 31, 2024, entitled “Inverter” and the Chinese patent application No. 202421854459.3, filed on July 31, 2024, entitled “A switching device and an inverter”, both of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of power supply, in particular to an inverter. BACKGROUND

[0003] With the continuous increase of photovoltaic installation capacity, photovoltaic inverters have become the mainstream power generation equipment in the photovoltaic industry. In order to ensure the stable operation of the power generation system in which the photovoltaic inverter is located, the photovoltaic inverter needs to avoid the spread of its own faults when internal faults occur.

[0004] At present, when an internal fault (such as a short circuit of the direct current bus BUS+, BUS- or internal power tube) of the photovoltaic inverter shown in FIG. 1 occurs, the controller sends a voltage drive signal to the magnetic flux of the direct current switch S1, so that the direct current switch S1 is tripped, and the connection line between the photovoltaic inverter and the photovoltaic string is disconnected, thereby realizing fault isolation.

[0005] For the above fault isolation scheme, after the direct current switch S1 is successfully tripped, even if the internal fault of the inverter has not been eliminated, maintenance personnel can still operate the handle of the direct current switch S1 to make the direct current switch S1 close again, thereby causing the inverter fault to expand. SUMMARY

[0006] The present application provides an inverter to trip the direct current switch through different drive devices when internal and external faults of the inverter occur, so that the user or system recovers from the trip caused by external faults, and the situation that the direct current switch is manually closed when the internal fault of the inverter still exists and causes the fault to spread can be avoided, thereby improving the safety of the inverter.

[0007] In a first aspect, the application provides an inverter, comprising an input end, a DC switch, a plurality of DC / DC converters, a DC bus, a DC / AC converter, a controller and an output end, the input end being configured to connect a photovoltaic string, the output end being configured to connect an AC power grid, the DC switch comprising an operating handle, an operating mechanism, a moving contact, a stationary contact, a first driving device and a second driving device. The input end of the plurality of DC / DC converters is connected to the input end of the inverter through the DC switch, and the output end of the plurality of DC / DC converters is connected in parallel to the DC bus. The input end of the DC / AC converter is connected to the DC bus, and the output end of the DC / AC converter is connected to the output end of the inverter. The operating mechanism comprises a locking component, a jump component and a transmission assembly. The operating handle, the jump component and the moving contact are respectively in transmission connection with the transmission assembly. The operating mechanism is configured to drive the moving contact and the stationary contact to contact and separate. When the jump component and the locking component are buckled, the operating handle can drive the transmission assembly to drive the moving contact and the stationary contact to contact and separate. When the jump component and the locking component are unbuckled, the operating handle cannot drive the transmission assembly to drive the moving contact and the stationary contact to contact and separate. The controller is configured to send a first driving signal to the first driving device when the inverter fails. The first driving device is configured to drive a moving component in the first driving device to move to drive the locking component and the jump component to unbuckle, so that the transmission assembly drives the moving contact and the stationary contact to separate. After the first driving device drives the moving contact and the stationary contact to separate, the operating handle is configured to be unable to drive the moving component in the first driving device to reset when subjected to an external force. The controller is further configured to send a second driving signal to the second driving device when the photovoltaic string or its connection line fails. The second driving device is configured to drive a moving component in the second driving device to move to drive the locking component and the jump component to unbuckle, so that the transmission assembly drives the moving contact and the stationary contact to separate. After the second driving device drives the moving contact and the stationary contact to separate, the operating handle is further configured to drive the jump component and the locking component to buckle when subjected to an external force, so that the operating handle can drive the transmission assembly to drive the moving contact and the stationary contact to contact.

[0008] In this embodiment, when the inverter fails, the operating handle cannot drive the moving component in the first driving device to reset when subjected to an external force after the DC switch is tripped. Therefore, the situation that the DC switch is manually closed when the internal failure of the inverter still exists and the failure is spread can be avoided. In addition, when the photovoltaic string or its connection line fails, the operating handle can drive the DC switch to close when subjected to an external force after the DC switch is tripped. Therefore, the debugging needs of maintenance personnel when troubleshooting the failure of the photovoltaic string or its connection line can be met.

[0009] With reference to the first aspect, in a first possible implementation, the controller is specifically configured to: in the case where the photovoltaic string or the connection line thereof fails, if the number of times of sending the second driving signal to the second driving device does not exceed a preset threshold, sending the second driving signal to the second driving device; and the controller is further configured to: in the case where the number of times of sending the second driving signal to the second driving device exceeds the preset threshold, in the case where the photovoltaic string or the connection line thereof fails, sending the first driving signal to the first driving device.

[0010] In this embodiment, after the DC switch is tripped due to the failure of the photovoltaic string or the connection line thereof, the DC switch can be manually closed within a preset number of times, thereby not only meeting the debugging requirements of maintenance personnel when troubleshooting the failure of the photovoltaic string or the connection line thereof, but also effectively preventing the failure from spreading.

[0011] With reference to the first aspect or the first possible implementation of the first aspect, in a second possible implementation, the controller is further configured to, in the case where the failure of the inverter is eliminated, send a third driving signal to the first driving device. The first driving device is further configured to, when receiving the third driving signal, drive the moving part in the first driving device to reset. After the moving part in the first driving device is reset, the operating handle, under the action of an external force, drives the jump buckle part to be buckled with the lock buckle part, so that the operating handle can drive the transmission assembly to drive the moving contact to contact the stationary contact.

[0012] In this embodiment, the inverter controls the moving part in the first driving device to reset in the case where the failure of the inverter is eliminated, thereby ensuring that the DC switch can be manually closed after the failure of the inverter is eliminated, to meet the maintenance or debugging requirements of maintenance personnel on the inverter.

[0013] With reference to any one of the first aspect to the second possible implementation of the first aspect, in a third possible implementation, the controller is further configured to, in the case where an electrical parameter of the inverter exceeds a first preset parameter range, determine that the inverter fails, wherein the electrical parameter of the inverter includes a bus voltage value or a bus current value of the DC bus.

[0014] In this embodiment, the inverter can determine whether it fails based on the bus voltage value or the bus current value, and the failure detection mode is various and has high flexibility.

[0015] With reference to any one of the first aspect to the third possible implementation of the first aspect, in a fourth possible implementation, the controller is further configured to, in the case where an electrical parameter of the photovoltaic string exceeds a second preset parameter range, determine that the photovoltaic string or the connection line thereof fails, wherein the electrical parameter of the photovoltaic string includes an output voltage value, an output current value, or a ground insulation impedance value.

[0016] In the embodiment, the inverter can determine whether the photovoltaic string or the connecting line thereof is faulty based on an output voltage value, an output current value or a ground insulation impedance value of the photovoltaic string, and the fault detection mode is various and high in flexibility.

[0017] In a possible implementation, the operating mechanism further comprises a reset component in transmission connection with the transmission assembly; after the second driving device drives the movable contact and the static contact to separate, the operating handle is specifically configured to: drive the reset component to move by the transmission assembly under the action of external force, and the reset component is configured to drive the movable component in the second driving device to reset; after the movable component in the second driving device resets, the operating handle is further configured to drive the jump buckle component to engage with the lock buckle component under the action of external force, so that the operating handle can drive the transmission assembly to drive the movable contact and the static contact to contact.

[0018] In the embodiment, the reset component corresponding to the movable component of the second driving device is arranged in the operating mechanism, so that the operating handle drives the reset component to move by the transmission assembly under the action of external force, to drive the movable component in the second driving device to reset, so that the jump buckle component and the lock buckle component can engage, and the contact between the movable contact and the static contact is further driven, thereby achieving the requirement that the user can close the switch by himself after the external fault of the inverter is eliminated. Meanwhile, since the reset component is arranged and in transmission connection with the transmission assembly, the movement of the transmission assembly can directly reset the movable component of the second driving device, without the need to manually reset the movable component by the user through equipment inserted into the switch housing through a maintenance hole, so that the reset and closing steps are greatly simplified, and the safety is improved.

[0019] In a possible implementation, the first driving device is specifically configured to drive the movable component of the first driving device to drive the lock buckle component to rotate from the first position to the second position according to the first driving signal, so that the lock buckle component and the jump buckle component are disengaged, and the transmission assembly drives the movable contact and the static contact to separate; after the first driving device drives the movable contact and the static contact to separate, the operating handle cannot drive the movable component in the first driving device to reset, the lock buckle component and the jump buckle component remain in the disengaged state, and the operating handle cannot drive the transmission assembly to drive the movable contact and the static contact to contact.

[0020] In a possible implementation, the first driving signal is further configured to drive the first driving device to lock the operating mechanism, and the operating handle cannot control the locked operating mechanism to drive the movable contact to move, so that the movable contact and the static contact remain in the separated state.

[0021] In a possible implementation, the first driving device and the second driving device both adopt electromagnetic release devices.

[0022] In one possible implementation, the first driving device adopts a double-stable tripping device, and the second driving device adopts an electromagnetic tripping device.

[0023] In a second aspect, the application provides an inverter, which comprises an input end, a DC switch, a plurality of DC / DC converters, a DC bus, a DC / AC converter, a controller and an output end. The input end is used to connect a photovoltaic string, and the output end is used to connect an AC power grid. The DC switch comprises an operating handle, an operating mechanism, a moving contact, a stationary contact and a first driving device. The input ends of the plurality of DC / DC converters are connected to the input end of the inverter through the DC switch, and the output ends of the plurality of DC / DC converters are connected in parallel to the DC bus. The input end of the DC / AC converter is connected to the DC bus, and the output end of the DC / AC converter is connected to the output end of the inverter. The operating mechanism comprises a locking component, a tripping component and a transmission assembly. The operating handle, the tripping component and the moving contact are respectively in transmission connection with the transmission assembly. The operating mechanism is used to drive the moving contact to contact and separate from the stationary contact. In the case that the tripping component is buckled with the locking component, the operating handle can drive the transmission assembly to drive the moving contact to contact and separate from the stationary contact. In the case that the tripping component is tripped from the locking component, the operating handle cannot drive the transmission assembly to drive the moving contact to contact and separate from the stationary contact. The controller is used to send a first driving signal to the first driving device in the case that the inverter, the photovoltaic string or the connection line of the photovoltaic string fails. The first driving device is used to drive a moving component in the first driving device to move to drive the locking component to trip from the tripping component and make the transmission assembly drive the moving contact to separate from the stationary contact when the first driving signal is received. The controller is further used to send a third driving signal to the first driving device in the case that the inverter is troubleshooting, and send the third driving signal to the first driving device in the case that the photovoltaic string or the connection line thereof is troubleshooting and the moving contact separates from the stationary contact. The first driving device is further used to drive the moving component in the first driving device to reset when the third driving signal is received. After the moving component in the first driving device is reset, the operating handle is further used to drive the tripping component to buckle with the locking component under the action of an external force, so that the operating handle can drive the transmission assembly to drive the moving contact to contact with the stationary contact.

[0024] In the embodiment, in the case that the inverter fails, after the DC switch is tripped, the operating handle cannot drive the moving part in the first driving device to reset in the case that external force is applied, thus, the case that the DC switch is manually closed to cause the fault to spread when the internal fault of the inverter still exists can be avoided. In addition, in the case that the photovoltaic string or the connection line thereof fails, after the DC switch is tripped, the inverter immediately controls the moving part in the first driving device to reset, and then the operating handle can drive the DC switch to close in the case that external force is applied, thus, the debugging requirement when the maintenance personnel eliminates the fault of the photovoltaic string or the connection line thereof can be met. In addition, the inverter controls the moving part in the first driving device to reset in the case that the fault of the inverter is eliminated, thus, it can be ensured that the DC switch can be manually closed after the fault of the inverter is eliminated.

[0025] With reference to the second aspect, in a first possible implementation, the controller is specifically configured to: in the case that the photovoltaic string or the connection line thereof fails and the moving contact and the stationary contact are separated, if the number of times of the third driving signal sent to the first driving device does not exceed a preset threshold, sending the third driving signal to the first driving device; and the controller is further configured to: in the case that the photovoltaic string or the connection line thereof fails, stopping sending the third driving signal to the first driving device in the case that the number of times of the third driving signal sent to the second driving device exceeds the preset threshold.

[0026] In the embodiment, after the DC switch is tripped due to the fault of the photovoltaic string or the connection line thereof, the DC switch can be manually closed within a preset number of times, thus, not only the debugging requirement when the maintenance personnel eliminates the fault of the photovoltaic string or the connection line thereof can be met, but also the fault spreading can be effectively avoided.

[0027] With reference to any one of the second aspect to the second aspect and the second possible implementation of the second aspect, in a fourth possible implementation, the controller is further configured to determine that the inverter fails in the case that an electrical parameter of the inverter exceeds a first preset parameter range, wherein the electrical parameter of the inverter includes a bus voltage value or a bus current value of the DC bus.

[0028] In the embodiment, the inverter can determine whether the inverter fails based on the bus voltage value or the bus current value, thus, the fault detection mode is various and the flexibility is high.

[0029] With reference to any one of the second aspect to the third possible implementation of the second aspect, in a fifth possible implementation, the controller is further configured to determine that the photovoltaic string or the connection line thereof fails in the case that an electrical parameter of the photovoltaic string exceeds a second preset parameter range, wherein the electrical parameter of the photovoltaic string includes an output voltage value, an output current value or a ground insulation impedance value.

[0030] In the embodiment, the inverter can determine whether the photovoltaic string or the connecting line thereof is faulty based on an output voltage value, an output current value, or a ground insulation impedance value of the photovoltaic string, and the fault detection mode is various and high in flexibility.

[0031] The application also provides a switching device and an inverter, so that the switching device is tripped by different trippers when internal and external faults occur in the inverter, thereby enabling a user or a system to recover from tripping caused by an external fault and enabling a maintenance personnel to recover from tripping caused by an internal fault, and thus improving the safety of the inverter.

[0032] In a third aspect, the application provides a switching device. The switching device comprises a housing, an operating handle, an operating mechanism, a moving contact, a stationary contact, a first tripper and a second tripper. Specifically, the operating handle is connected to the operating mechanism, and the operating mechanism is connected to the moving contact. At least a part of the operating handle close to the operating mechanism, the operating mechanism, the first tripper and the second tripper are located in the housing. The operating mechanism comprises a lock assembly and a transmission assembly. The operating handle and the moving contact are respectively in transmission connection with the transmission assembly. The transmission assembly comprises a trip and a rocker arm, and the trip, the rocker arm and the lock assembly are respectively relatively rotatable with the housing. The trip is in transmission connection with the rocker arm. The operating handle and the moving contact are respectively in transmission connection with the rocker arm. The rocker arm is provided with a reset driving part. When the lock assembly is located at a first position, the lock assembly is in a latched state with the trip, so that the operating handle can control the operating mechanism to drive the moving contact to move, thereby enabling the moving contact to contact or separate from the stationary contact. When the lock assembly is located at a second position, the lock assembly is disengaged from the trip, so that the operating handle is tripped from the transmission assembly, thereby preventing the operating handle from controlling the operating mechanism to drive the moving contact to move, and enabling the moving contact to keep in a separated state from the stationary contact. The first tripper comprises a first driving part. The first tripper is configured to drive the first driving part to drive the lock assembly to rotate from the first position to the second position according to a first driving signal, so that the lock assembly is disengaged from the trip. When the operating handle drives the rocker arm to rotate in a direction close to the first tripper, the reset driving part moves towards the first driving part and drives the first driving part to reset, so that the lock assembly can be reset from the second position to the first position. When the operating handle drives the rocker arm to rotate in the direction close to the first tripper, the rocker arm can drive the trip to rotate towards the lock assembly, so that the trip is latched with the lock assembly, and the operating handle can control the operating mechanism to drive the moving contact to move. The second tripper comprises a second driving part. The second tripper is configured to lock the movement of the operating mechanism according to a second driving signal, so that the operating handle cannot control the operating mechanism to drive the moving contact to move, and the moving contact keeps in the separated state from the stationary contact.

[0033] The switch device of the present application can be applied in an inverter for turning on or off the electrical connection between the inverter circuit of the inverter and the photovoltaic module. When the inverter fails, the controller of the inverter can send a driving signal to the switch device, so that the switch device trips. The internal failure of the inverter can be caused by the failure of the internal equipment of the inverter itself, including but not limited to overvoltage failure, overcurrent failure, breakdown failure, etc., so that the internal failure of the inverter needs to be solved by professional maintenance personnel, and cannot be completed by user inspection only. The external failure of the inverter can be caused by the external environmental failure of the inverter. Among them, the failure caused by the external environmental failure of the inverter can occur in the internal part of the inverter, or can occur in the external part of the inverter, which is regarded as the external failure of the inverter in the present application. The external failure of the inverter can be checked and solved by the user or the system. Specifically, when the external failure of the inverter occurs, the first driving part of the first tripping device drives the lock catch assembly to rotate from the first position to the second position, so that the lock catch assembly is separated from the trip catch, thereby making the operating mechanism and the operating handle tripped, and the moving contact and the stationary contact are separated. In this way, the operating handle cannot control the operating mechanism to drive the moving contact to move, so that the moving contact and the stationary contact remain in a separated state. At this time, the operating handle can drive the rocker arm to approach the first tripping device, so that the reset driving part moves towards the first driving part and drives the first driving part to reset, and the trip catch and the lock catch assembly are re-engaged. In this way, the operating handle can control the operating mechanism to drive the moving contact to move. When the internal failure of the inverter occurs, the second driving part of the second tripping device locks the operating mechanism, and the moving contact and the stationary contact are separated. In this way, the operating handle cannot control the operating mechanism to drive the moving contact to move, so that the moving contact and the stationary contact remain in a separated state. Therefore, when the internal and external failures of the inverter occur, the switch device is tripped by different tripping devices, so that the user or the system recovers the trip caused by the external failure, and the maintenance personnel recovers the trip caused by the internal failure, thereby improving the safety of the inverter.

[0034] The movement of the above-mentioned second tripping device for locking the operating mechanism can be achieved by locking different parts of the operating mechanism.

[0035] In one possible implementation, the second tripping device can lock the position of the lock catch assembly to achieve the engagement and disengagement of the lock catch assembly and the trip catch. Specifically, the second tripping device is configured to drive the second driving part to drive the lock catch assembly to rotate from the first position to the second position according to the second driving signal, so that the lock catch assembly and the trip catch remain in a disengaged state.

[0036] In another possible implementation, the second trip device can trip the operating handle from the operating mechanism by locking the movement of the transmission assembly. Specifically, the transmission assembly further includes a first mounting plate, a second mounting plate and an output shaft. Specifically, the first mounting plate and the second mounting plate are oppositely arranged, the operating handle passes through the first mounting plate and the second mounting plate and rotates relative to the first mounting plate and the second mounting plate. The rocker arm is located between the first mounting plate and the second mounting plate and is rotatably connected to the first mounting plate and the second mounting plate. The rocker arm is drivingly connected to the movable contact through the output shaft. The first mounting plate is provided with a first sliding groove, and the second mounting plate is provided with a second sliding groove. One end of the output shaft is accommodated in the first sliding groove, and the other end is accommodated in the second sliding groove. When the operating handle drives the rocker arm to rotate, the rocker arm drives the output shaft to slide in the first sliding groove and the second sliding groove, thereby driving the movable contact to move. In another possible implementation, the second trip device is configured to drive the second driving component to extend between the rocker arm and the first mounting plate or to extend between the rocker arm and the second mounting plate according to the second driving signal, so that the rocker arm cannot rotate, thereby locking the movement of the transmission assembly, so that the operating handle cannot control the operating mechanism to drive the movable contact to move. In another possible implementation, the second trip device is configured to drive the second driving component to extend into the first sliding groove or the second sliding groove according to the second driving signal, so as to lock the sliding of the output shaft in the first sliding groove and the second sliding groove, so that the rocker arm cannot rotate, thereby locking the movement of the transmission assembly, so that the operating handle cannot control the operating mechanism to drive the movable contact to move.

[0037] In one possible implementation, the first trip device can be an electromagnetic trip device. Specifically, the first trip device further includes a first coil assembly, a first permanent magnet assembly and a first spring, the first spring being connected to the first driving component. The first permanent magnet assembly generates a first magnetic field to exert a first force on the first driving component. The first coil assembly is configured to be energized according to the first driving signal, so that the first coil assembly generates a first induced magnetic field to exert a second force on the first driving component, and the second force counteracts the first force, thereby driving the first spring to drive the first driving component to move towards the locking assembly, and driving the locking assembly to rotate from the first position to the second position.

[0038] In one possible implementation, the first tripping device is an electromagnetic tripping device. The first driving component includes a first moving iron core, the first permanent magnet assembly includes a first permanent magnet, and the first coil assembly includes a first coil. The first tripping device further includes a first stationary iron core having a first accommodating space, one end of the first moving iron core, the first permanent magnet and the first coil being located in the first accommodating space. The first permanent magnet is located at one end of the first moving iron core, and the first coil is sleeved on the first moving iron core. The other end of the first moving iron core extends out of the first accommodating space and is arranged towards the locking assembly. The first spring is sleeved on the other end of the first moving iron core, one end of the first spring is fixed opposite to the first stationary iron core, and the other end of the first spring is fixed opposite to the other end of the first moving iron core. When the first coil is energized, the first induced magnetic field generated by the first coil is opposite to the first magnetic field generated by the first permanent magnet and is offset, so that the first moving iron core moves away from the first stationary iron core under the action of the first spring. When the operating handle drives the rocker arm to rotate towards the first tripping device, the reset driving part drives the first moving iron core to reset, so that the first permanent magnet magnetically attracts the first moving iron core, and the first moving iron core presses the first spring, so that the first tripping device returns to the initial state. The first tripping device has a simple structure and can reduce the manufacturing cost of the switch device.

[0039] Similarly, the second tripping device can also be an electromagnetic tripping device. Specifically, the second tripping device further includes a second coil assembly, a second permanent magnet assembly and a second spring, and the second spring is connected with the second driving component. The second magnetic field generated by the second permanent magnet assembly applies a third acting force to the second driving component, and the second coil assembly is used to be energized according to the second driving signal, so that the second induced magnetic field generated by the second coil assembly applies a fourth acting force to the second driving component, and the fourth acting force and the third acting force are offset, so that the second spring drives the second driving component to move towards the locking assembly, and drives the locking assembly to rotate from the first position to the second position.

[0040] In a possible implementation, the second tripping device is of an electromagnetic tripping device type, and the second driving component includes a second moving iron core, the second permanent magnet assembly includes a second permanent magnet, and the second coil assembly includes a second coil. The second tripping device further includes a second stationary iron core having a second accommodating space, and the one end of the second moving iron core, the second permanent magnet and the second coil are located in the second accommodating space. The second permanent magnet is located at the one end of the second moving iron core, and the second coil is sleeved on the second moving iron core. The other end of the second moving iron core extends out of the second accommodating space and is arranged towards the locking assembly. A second spring is sleeved on the other end of the second moving iron core, one end of the second spring is fixed opposite to the second stationary iron core, and the other end of the second spring is fixed opposite to the other end of the second moving iron core. When the second coil is energized, a second induced magnetic field generated by the second coil is opposite to a second magnetic field of the second permanent magnet and is offset, so that the second moving iron core moves away from the second stationary iron core under the action of the second spring. When the operating handle drives the rocker arm to rotate towards the second tripping device, the reset driving part drives the second moving iron core to reset, so that the second permanent magnet magnetically attracts the second moving iron core, and the second moving iron core presses the second spring, so that the second tripping device returns to the initial state. The second tripping device has a simple structure, and can reduce the manufacturing cost of the switch device.

[0041] In another possible implementation, the second tripping device can be a bistable tripping device. Specifically, the second tripping device further comprises a third coil assembly and a third permanent magnet assembly. The third permanent magnet assembly generates a third magnetic field that exerts a fifth force on the second driving component. The third coil assembly is configured to be energized according to a second driving signal, so that the third coil assembly generates a third induced magnetic field that exerts a sixth force on the second driving component, and a part of the sixth force counteracts the fifth force, so that the second driving component is driven to move toward the locking assembly under the action of another part of the sixth force, and the locking assembly is driven to rotate from the first position to the second position. The third coil assembly is further configured to be energized according to a reset signal, so that the third coil assembly generates a fourth induced magnetic field that exerts a seventh force on the second driving component, and a part of the seventh force counteracts the fifth force, so that the second driving component is reset under the action of another part of the seventh force. In this technical solution, when an internal fault occurs, even if the operating handle is operated, the second tripping device still locks the movement of the operating mechanism, so that the operating mechanism cannot drive the movable contact to move, and the switch device cannot be closed, thereby improving the stability of the switch device in the tripped state. After the internal fault is solved, the second driving component can be reset, so that the locking assembly can be reset to the first position and kept in the first position. Therefore, when the operating handle drives the operating mechanism to move, the locking assembly can be engaged with the tripping latch, so that the closing and opening of the switch device can be realized through the operating handle, thereby improving the stability of the switch device in the normal working state. By changing the current direction of the coil winding when energized, the stability of the switch device in the tripped state and the normal working state can be realized, thereby realizing the bistability of the switch device.

[0042] In one possible implementation, the second tripping device is of a bistable tripping device type. The third coil assembly includes a coil winding, a first magnetic yoke and a second magnetic yoke. The coil winding is fixed relative to the housing. The first magnetic yoke and the second magnetic yoke are oppositely arranged at two ends of the coil winding. The third permanent magnet assembly is fixedly connected with the second driving component. The third permanent magnet assembly is located between the first magnetic yoke and the second magnetic yoke, and includes a first magnetic pole portion and a second magnetic pole portion oppositely arranged with opposite magnetic poles. The first magnetic yoke extends to between the first magnetic pole portion and the second magnetic pole portion at an end away from the coil winding, and the second magnetic yoke extends to between the first magnetic pole portion and the second magnetic pole portion at an end away from the coil winding. The coil winding is configured to be energized according to the second driving signal, so that a third induced magnetic field generated by the coil winding generates an attractive force on the first magnetic pole portion and a repulsive force on the second magnetic pole portion through the first magnetic yoke, and generates a repulsive force on the first magnetic pole portion and an attractive force on the second magnetic pole portion through the second magnetic yoke, to drive the third permanent magnet assembly to rotate in a first rotation direction and drive the second driving component to move, thereby locking the movement of the operating mechanism. The coil winding is also configured to be energized according to a reset signal, so that a fourth induced magnetic field generated by the coil winding generates a repulsive force on the first magnetic pole portion and an attractive force on the second magnetic pole portion through the first magnetic yoke, and generates an attractive force on the first magnetic pole portion and a repulsive force on the second magnetic pole portion through the second magnetic yoke, to drive the third permanent magnet assembly to rotate in a second rotation direction and drive the second driving component to reset, thereby unlocking the movement of the operating mechanism.

[0043] In the above switch device, the driving component includes a rotating rod and a push rod. The rotating rod is rotatable relative to the housing, and is fixedly connected with the third permanent magnet assembly. The rotating rod is movably connected with the push rod. The push rod is movably connected with the housing. The third permanent magnet assembly is configured to drive the rotating rod to rotate, to drive the push rod to move towards the operating mechanism, and to drive the push rod to move away from the operating mechanism. In this technical solution, the induced magnetic field generated by the coil winding acts on the first magnetic pole portion and the second magnetic pole portion through the first magnetic yoke and the second magnetic yoke, to drive the third permanent magnet assembly to move. During the movement of the third permanent magnet assembly, the rotating rod rotates with the third permanent magnet assembly, and drives the push rod to slide, i.e., converts the rotating movement into sliding movement, so as to drive the push rod to move towards or away from the operating mechanism.

[0044] The movable connection between the push rod and the rotating rod can be achieved by simple structural design. In one possible implementation, the push rod has an opening, and the rotating rod has a protrusion. The protrusion is accommodated in the opening, and the movable connection between the push rod and the rotating rod is achieved by rotation in the opening.

[0045] In another possible implementation, the driving component includes a rotating rod. The rotating rod is relatively rotatable with the housing, and the rotating rod is fixedly connected with the third permanent magnet assembly. The rotating rod is relatively fixed with the locking catch assembly. The third permanent magnet assembly is configured to drive the rotating rod to rotate, so as to drive the locking catch assembly to rotate from the first position to the second position, and to drive the locking catch assembly to rotate from the second position to the first position. Alternatively, the rotating rod is relatively fixed with the rocker arm. The third permanent magnet assembly is configured to drive the rocker arm to rotate, so as to limit the movement of the rocker arm. In this technical solution, the induced magnetic field generated by the coil winding acts on the first magnetic pole part and the second magnetic pole part through the first magnetic yoke and the second magnetic yoke, so as to drive the third permanent magnet assembly to move. In the movement process of the third permanent magnet assembly, the rotating rod follows the third permanent magnet assembly to rotate, and directly drives the locking catch assembly to rotate, so as to directly drive the locking catch assembly to rotate between the first position and the second position. Alternatively, the rotating rod drives the rocker arm to rotate, so as to lock the position of the rocker arm.

[0046] In another possible implementation, the second tripping device is of a bistable tripping device type, the drive component includes a moving shaft, the third coil assembly includes a third coil and a fourth coil, and the third permanent magnet assembly includes a third permanent magnet and a fourth permanent magnet. The moving shaft is relatively slidable with the housing, and the moving shaft is in transmission connection with the operating mechanism. The third coil and the fourth coil are connected in series and are arranged around the outer periphery of the moving shaft. The third permanent magnet and the fourth permanent magnet are relatively fixed with the housing, and the third permanent magnet and the fourth permanent magnet are located between the third coil and the fourth coil. Along the sliding direction of the moving shaft, the third permanent magnet and the fourth permanent magnet are located on two sides of the moving shaft. The magnetic path direction in the third permanent magnet is opposite to the magnetic path direction in the fourth permanent magnet and is perpendicular to the sliding direction. In the part of the moving shaft located on the side of the third permanent magnet facing the third coil, the magnetic path direction of the magnetic field generated by the third permanent magnet and the fourth permanent magnet is a first direction. In the part of the moving shaft located on the side of the third permanent magnet facing the fourth coil, the magnetic path direction of the magnetic field generated by the third permanent magnet and the fourth permanent magnet is a second direction. The first direction is opposite to the second direction, and the first direction and the second direction are parallel to the sliding direction. The second coil and the third coil are configured to be energized according to the second drive signal and generate a third induced magnetic field, so that the magnetic path direction of the third induced magnetic field in the moving shaft is the same as the first direction and opposite to the second direction, so that the moving shaft slides in the first direction and approaches the operating mechanism, thereby locking the movement of the operating mechanism. The third coil and the fourth coil are also configured to be energized according to a reset signal and generate a fourth induced magnetic field, so that the magnetic path direction of the fourth induced magnetic field in the moving shaft is the same as the second direction and opposite to the first direction, so that the moving shaft slides in the second direction to reset, thereby unlocking the movement of the operating mechanism. In this technical solution, when an internal fault occurs, even if the operating handle is operated, the second tripping device still locks the movement of the operating mechanism, so that the operating mechanism cannot drive the movable contact to move, causing the switch device to be unable to close, thereby improving the stability of the switch device in the tripped state. After the internal fault is solved, the second drive component can be reset, so that the locking assembly can be reset to the first position and remain in the first position. Therefore, when the operating handle drives the operating mechanism to move, the locking assembly can be engaged with the tripping latch, so that the closing and opening of the switch device can be realized through the operating handle, thereby improving the stability of the switch device in the normal working state. By changing the current direction of the coil winding when energized, the stability of the switch device in the tripped state and the normal working state can be realized, thereby realizing the bistability of the switch device.

[0047] In the above switch device, the second trip unit further comprises a third mounting plate and a third yoke. The third mounting plate is fixed relative to the housing. The third yoke is a U-shaped yoke, and the third mounting plate covers an opening of the U-shaped yoke and forms a third accommodating space. The moving shaft, the third coil, the fourth coil, the third permanent magnet, and the fourth permanent magnet are located in the third accommodating space. In one possible implementation, the third mounting plate is located at a side of the U-shaped yoke close to the locking assembly, and the third mounting plate is provided with a first opening, and one end of the moving shaft extends out of the third accommodating space through the first opening. In another possible implementation, the third mounting plate is located at a side of the U-shaped yoke away from the locking assembly. The U-shaped yoke comprises two parallel sidewalls and a bottom wall connecting the two sidewalls, and the bottom wall is located opposite to the third mounting plate. The bottom wall is provided with a second opening. One end of the moving shaft extends out of the third accommodating space through the second opening. In this technical solution, when the second coil and the third coil are energized, the third yoke can diffuse the induced magnetic field generated by the second coil and the third coil to the entire accommodating space, so that the induced magnetic field can cover the moving shaft.

[0048] In one possible implementation, the locking assembly comprises a traction rod and a locking rod, and the traction rod and the locking rod are rotationally connected to the housing respectively. The traction rod is located at a side of the locking rod away from the trip lever. The locking rod is configured to be buckled with or separated from the trip lever. When the locking assembly is located at the first position, the first surface of the traction rod abuts against the locking rod, and the locking rod is buckled with the trip lever. When the locking assembly is located at the second position, the second surface of the traction rod abuts against the locking rod, and the locking rod is separated from the trip lever. When the locking assembly rotates from the first position to the second position, the locking rod slides from the first surface of the traction rod to the second surface. When the locking assembly resets from the second position to the first position, the locking rod slides from the second surface of the traction rod to the first surface. By changing the surface of the traction rod abutting against the locking rod, the locking rod can be buckled with or separated from the trip lever. In actual applications, the traction rod can be rotated to achieve this.

[0049] In one possible implementation, the locking assembly is provided with a reset member configured to drive the locking assembly to reset from the second position to the first position, so that the locking assembly is buckled with the trip lever when the operating handle drives the operating mechanism to move. In this way, after the first trip unit and the second trip unit are separated from the locking assembly, the locking assembly can reset to the first position under the action of the reset member, so as to wait for the locking assembly to be buckled with the trip lever again, and enable the switch device to be closed and opened.

[0050] The specific type of the switch device of the present application is not limited, for example, the switch device can comprise a circuit breaker, an isolating switch, or other circuit switches.

[0051] In a possible implementation, the switch device comprises a plurality of moving contacts and a plurality of static contacts, the number of the moving contacts and the number of the static contacts are equal and one-to-one corresponding, and the moving contacts are respectively in transmission connection with the transmission assembly of the operating mechanism. A single moving contact and a corresponding static contact can form a layer of contact assembly and be used to turn on or turn off a branch. The switch device of the technical scheme can be applied to multiple branches in a circuit.

[0052] In a fourth aspect, the application provides an inverter. The inverter comprises an inverter circuit, a controller and the switch device of the first aspect. The inverter circuit is electrically connected with the photovoltaic module through the switch device, and the switch device is used to turn on or turn off the electrical connection between the photovoltaic module and the inverter circuit. The controller is electrically connected with the switch device. The controller is used to send a first driving signal to the switch device when a fault occurs outside the inverter. The first tripping device of the switch device is used to drive the locking assembly to rotate from the first position to the second position according to the first driving signal, so that the locking assembly and the jump buckle are kept in a disengaged state, so that the operating handle cannot control the operating mechanism to drive the moving contact to move, and the moving contact and the static contact are kept in a separated state to turn off the electrical connection between the photovoltaic module and the inverter circuit. The controller is also used to send a second driving signal to the switch device when a fault occurs inside the inverter. The second tripping device of the switch device is used to lock the movement of the operating mechanism according to the second driving signal, so that the operating handle cannot control the operating mechanism to drive the moving contact, and the moving contact and the static contact are kept in a separated state, thereby turning off the electrical connection between the photovoltaic module and the inverter circuit.

[0053] When an inverter malfunctions, its controller can send a drive signal to the switching device, causing it to trip. Internal inverter faults may be caused by inherent defects in the inverter's internal components, including but not limited to overvoltage, overcurrent, and breakdown faults. Therefore, internal inverter faults require professional maintenance personnel to resolve, and cannot be handled solely by the user. External inverter faults may be caused by environmental factors. These external environmental faults can occur either inside or outside the inverter; in this application, they are both considered external faults. External faults can be inspected and resolved by the user or the system. In both internal and external inverter faults, different trip units trip the switching device, allowing the user or system to restore tripping caused by external faults and enabling maintenance personnel to restore tripping caused by internal faults, thereby improving inverter safety. After resolving external inverter faults, the user or system can automatically close the switching device to restore the electrical connection between the inverter circuit and the photovoltaic modules. After external faults in the inverter are resolved by maintenance personnel, the personnel will then close the circuit breaker to restore the electrical connection between the inverter circuit and the photovoltaic modules. This prevents the user from closing the circuit breaker without addressing the internal issues, thus avoiding damage to the inverter. Attached Figure Description

[0054] Figure 1 is a structural schematic diagram of a photovoltaic inverter provided by the prior art;

[0055] Figure 2 is a schematic diagram of the application scenario of the inverter provided in the embodiment of this application;

[0056] Figure 3 is a structural schematic diagram of an inverter provided in an embodiment of this application;

[0057] Figure 4 is a schematic diagram of a DC switch provided in an embodiment of this application;

[0058] Figure 5 is another schematic diagram of the DC switch provided in an embodiment of this application;

[0059] Figure 6 is another schematic diagram of the DC switch provided in an embodiment of this application;

[0060] Figure 7 is another schematic diagram of a DC switch provided in an embodiment of this application;

[0061] Figure 8 is another schematic diagram of the DC switch provided in an embodiment of this application;

[0062] Figure 9 is another schematic diagram of a DC switch provided in an embodiment of this application;

[0063] Figure 10 is a schematic diagram of the inverter fault detection method provided in an embodiment of this application;

[0064] Fig. 11 is a schematic view of a switch device according to an embodiment of the present application;

[0065] Fig. 12 is another schematic view of a switch device according to an embodiment of the present application;

[0066] Fig. 13 is another schematic view of a switch device according to an embodiment of the present application;

[0067] Fig. 14 is an exploded schematic view of a switch device according to an embodiment of the present application;

[0068] Fig. 15 is a schematic view of a traction rod, a locking rod and a transmission mechanism according to an embodiment of the present application;

[0069] Fig. 16 is a sectional view of the traction rod, the locking rod and the transmission mechanism along the direction X-X according to an embodiment of the present application;

[0070] Fig. 17 is a schematic view of a traction rod and a locking rod according to an embodiment of the present application;

[0071] Fig. 18 is another schematic view of a traction rod and a locking rod according to an embodiment of the present application;

[0072] Fig. 19 is a schematic view of a traction rod, a locking rod and a jumper in a first position of a locking assembly according to an embodiment of the present application;

[0073] Fig. 20 is an enlarged schematic view of the traction rod and the locking rod in Fig. 19;

[0074] Fig. 21 is a schematic view of a traction rod, a locking rod and a jumper in a second position of a locking assembly according to an embodiment of the present application;

[0075] Fig. 22 is an enlarged schematic view of the traction rod and the locking rod in Fig. 21;

[0076] Fig. 23 is an exploded schematic view of a traction rod, a locking rod and a transmission mechanism according to an embodiment of the present application;

[0077] Fig. 24 is another schematic view of a traction rod, a locking rod and a transmission mechanism according to an embodiment of the present application;

[0078] Fig. 25 is another schematic view of a traction rod, a locking rod and a transmission mechanism according to an embodiment of the present application;

[0079] Fig. 26 is another schematic view of a traction rod, a locking rod and a transmission mechanism according to an embodiment of the present application;

[0080] Fig. 27 is a schematic view of a switch device in a closed state according to an embodiment of the present application;

[0081] Fig. 28 is a partial schematic view of the switch device in Fig. 27;

[0082] Fig. 29 is a schematic view of a switch device in an open state according to an embodiment of the present application;

[0083] Fig. 30 is a partial schematic view of the switch device in Fig. 29;

[0084] Fig. 31 is a schematic view of a switch device in a tripped state according to an embodiment of the present application;

[0085] Fig. 32 is a partial schematic view of the switch device in Fig. 31;

[0086] Fig. 33 is a schematic view of an electromagnetic release according to an embodiment of the present application;

[0087] Fig. 34 is a schematic view of an electromagnetic release according to an embodiment of the present application;

[0088] Fig. 35 is a partial schematic view of a second release and operating mechanism according to an embodiment of the present application;

[0089] Fig. 36 is another partial schematic view of a second release and operating mechanism according to an embodiment of the present application;

[0090] Fig. 37 is another partial schematic view of a second release and operating mechanism according to an embodiment of the present application;

[0091] Fig. 38 is another partial schematic view of a second release and operating mechanism according to an embodiment of the present application;

[0092] Fig. 39 is a schematic view of a second release according to an embodiment of the present application;

[0093] Fig. 40 is another schematic view of a second release according to an embodiment of the present application;

[0094] Fig. 41 is another schematic view of a second release according to an embodiment of the present application;

[0095] Fig. 42 is another schematic view of a second release according to an embodiment of the present application;

[0096] Fig. 43 is another schematic view of a second release according to an embodiment of the present application;

[0097] Fig. 44 is another schematic view of a second release according to an embodiment of the present application;

[0098] Fig. 45 is an exploded schematic view of the second release in Fig. 44;

[0099] Fig. 46 is another schematic view of a second release according to an embodiment of the present application;

[0100] Fig. 47 is a schematic view of a second release being energized according to an embodiment of the present application;

[0101] Fig. 48 is another energization schematic diagram of the second trip provided in the embodiments of the present application.

[0102] Fig. 49 is another structural schematic diagram of the inverter provided in the present application.

[0103] Fig. 50 is another schematic diagram of the DC switch provided in the present application.

[0104] Fig. 51 is another schematic diagram of the DC switch provided in the present application.

[0105] Fig. 52 is another schematic diagram of the DC switch provided in the present application.

[0106] Fig. 53 is another schematic diagram of the DC switch provided in the present application. DETAILED DESCRIPTION

[0107] The inverter provided in the present application can be applied to various application fields such as photovoltaic power generation, hybrid power generation, new energy intelligent microgrid, power transmission and distribution, etc. The inverter provided in the present application can be applied to different application scenarios, such as photovoltaic power supply, hybrid power supply, UPS power supply, etc. The photovoltaic power supply scenario is taken as an example for illustration.

[0108] Referring to Fig. 2, Fig. 2 is a schematic diagram of the application scenario of the inverter provided in the present application. As shown in Fig. 2, the inverter 1 includes an input end, a DC switch S1, a DC / DC converter 111, …, a DC / DC converter 11n, a DC bus (including a positive DC bus BUS+ and a negative DC bus BUS-), a DC / AC converter 12, a controller 13 and an output end. The DC switch S1 includes an operating handle, an operating mechanism, a moving contact, a stationary contact, a first driving device and a second driving device. The operating mechanism includes a trip component and a lock component. n is an integer greater than 1. The operating mechanism includes a lock component, a trip component, a transmission assembly and a reset component. The operating handle, the trip component, the reset component and the moving contact are respectively in transmission connection with the transmission assembly. The operating mechanism is used to drive the moving contact to contact and separate from the stationary contact. When the trip component and the lock component are buckled, the operating handle can drive the transmission assembly to drive the moving contact to contact and separate from the stationary contact. When the trip component and the lock component are unbuckled, the operating handle cannot drive the transmission assembly to drive the moving contact to contact and separate from the stationary contact.

[0109] The input end of the inverter 1 is connected with a photovoltaic string (at least one photovoltaic module string in parallel), and the output end of the inverter 1 is connected with an alternating current power grid or a load (such as a household appliance). The input end of the DC / DC converter 111,..., the input end of the DC / DC converter 11n are all connected with the input end of the inverter 1 through the direct current switch S1, and the output end of the DC / DC converter 111,..., the output end of the DC / DC converter 11n are all connected with the positive direct current bus BUS+ and the negative direct current bus BUS- in parallel. The input end of the DC / AC converter 12 is connected with the positive direct current bus BUS+ and the negative direct current bus BUS- respectively, and the output end of the DC / AC converter 12 is connected with the output end of the inverter 1.

[0110] After the inverter 1 starts to operate, that is, after the direct current switch S1 is closed, the controller 13 controls each DC / DC converter in the above-mentioned n DC / DC converters to adjust the output voltage of the photovoltaic string connected with each DC / DC converter, so as to perform maximum power point tracking (MPPT) on the output power of the photovoltaic string, so that the output power of the photovoltaic string connected with each DC / DC converter is maximum. At the same time, the controller 13 also controls each DC / DC converter to perform direct current conversion on the output voltage of the photovoltaic string connected with each DC / DC converter, and outputs the direct current voltage after the direct current conversion to the direct current bus. The controller 13 also controls the DC / AC converter 12 to convert the direct current bus voltage at the input end thereof into alternating current, thereby realizing power supply for various types of electrical equipment such as an alternating current power grid or a load.

[0111] The embodiment of the present application mainly optimizes the operation of the direct current switch S1 in the fault scenario in the above-mentioned implementation scenario.

[0112] Specifically, the embodiment of the present application divides the fault scenarios into two categories. One category is the fault of the internal devices or lines of the inverter 1, and this type of fault needs to be excluded by professional personnel, otherwise, closing the direct current switch S1 before the fault is excluded will cause the fault to be further expanded. The other category is the external fault of the inverter 1 on the direct current side, mainly the fault of the photovoltaic string or the connection line thereof, and this type of fault is generally caused by the reverse connection of the photovoltaic module by human beings. Therefore, after the fault is excluded by human beings, the direct current switch S1 can be closed by human beings to start the normal work of the inverter.

[0113] Based on the above-mentioned fault classification and fault solving idea, the embodiment of the present application designs an inverter, the controller 13 of which can classify the above-mentioned two types of faults, and the internal structure of the direct current switch S1 is improved, so that the direct current switch S1 can achieve different effects under the control of the controller 13 in different fault types.

[0114] Specifically, after the inverter 1 starts running, if a fault inside the inverter 1 is detected, the controller 13 sends a first driving signal to the first driving device. When receiving the first driving signal, the first driving device drives the moving part in the first driving device to move, so as to drive the locking part and the tripping part to be tripped, thereby separating the moving contact and the static contact of the DC switch S1, to disconnect the connection between the inverter 1 and the photovoltaic string, and to realize fault isolation. In the embodiment of the present application, after the moving contact and the static contact of the DC switch S1 are separated by the first driving device in the case of a fault inside the inverter 1, since the moving part continuously applies force to the locking part, the operating handle cannot drive the moving part in the first driving device to reset under the action of external force, so that the tripping part and the locking part cannot be buckled, and thus the operating handle cannot drive the DC switch S1 to close.

[0115] If a fault of the photovoltaic string or its connection line (external DC side fault of the inverter) is detected, the controller 13 sends a second driving signal to the second driving device. When receiving the second driving signal, the second driving device drives the moving part in the second driving device to move, so as to drive the locking part and the tripping part to be tripped, thereby separating the moving contact and the static contact of the DC switch S1, to disconnect the connection between the inverter 1 and the photovoltaic string, and to realize fault isolation. In the embodiment of the present application, after the moving contact and the static contact of the DC switch S1 are separated by the second driving device in the case of a fault of the photovoltaic string or its connection line, by providing the reset part for the second driving device in the DC switch S1, the operating handle can drive the moving part in the second driving device to reset through the reset part under the action of external force, and thus the operating handle can further drive the tripping part and the locking part to be buckled, and drive the moving contact and the static contact of the DC switch S1 to be in contact, so as to close the DC switch S1.

[0116] It can be understood that, in the case of a fault of the inverter 1, since the operating handle cannot drive the moving part in the first driving device to reset under the action of external force after the DC switch S1 is opened, and thus the locking part and the tripping part are continuously kept in the tripped state, the case that the DC switch S1 is manually closed to cause fault propagation when the internal fault of the inverter 1 still exists can be avoided. In addition, in the case of a fault of the photovoltaic string or its connection line, since the reset part for the second driving device exists, the moving part of the second driving device can be reset by the reset part through the operating handle under the action of external force after the DC switch is opened, and thus the tripping part and the locking part can be driven to be buckled, and the DC switch S1 can be closed, so that the debugging requirement of maintenance personnel when troubleshooting the fault of the photovoltaic string or its connection line can be met.

[0117] The above is only an example of the application scenarios of the inverter provided by the present application, and is not exhaustive. The application scenarios are not limited.

[0118] The working principle of the inverter provided by the present application will be described below with reference to FIGS. 3-14.

[0119] Referring to FIG. 3, FIG. 3 is a structural schematic diagram of an inverter provided by the present application. As shown in FIG. 3, the inverter 1 includes input terminals (including input terminal i11+, input terminal i11-, input terminal i12+, input terminal i12-, …, input terminal i1n1+, input terminal i1n1-, input terminal i1n2+, and input terminal i1n2-), a DC switch S1, a DC / DC converter 111, …, a DC / DC converter 11n, DC buses (including a positive DC bus BUS+ and a negative DC bus BUS-), a DC / AC converter 12, a controller 13, and output terminals (including output terminal o11 and output terminal o12). The DC switch S1 includes an operating handle, an operating mechanism, a moving contact, a stationary contact, a first driving device, and a second driving device. The operating mechanism includes a trip catch component and a lock catch component. n is an integer greater than 1. The input terminals of the inverter 1 are used to connect photovoltaic strings. The output terminals o11 and o12 of the inverter 1 are used to connect an AC power grid. The input terminals of the n DC / DC converters are connected to the input terminals of the inverter 1 through the DC switch S1. The output terminals of the n DC / DC converters are connected in parallel to the positive DC bus BUS+ and the negative DC bus BUS- respectively. The input terminals of the DC / AC converter 12 are connected to the positive DC bus BUS+ and the negative DC bus BUS- respectively. The output terminals of the DC / AC converter 12 are connected to the output terminals o11 and o12 of the inverter 1 respectively.

[0120] In an implementation scenario, during the process in which the inverter 1 supplies power to the AC power grid, in the case where the inverter 1 fails, the controller 13 sends a first driving signal to the first driving device. Upon receiving the first driving signal, the first driving device drives the moving component in the first driving device to drive the lock catch component to be tripped from the trip catch component, so as to separate the moving contact from the stationary contact of the DC switch S1, that is, to open the DC switch S1. After the DC switch S1 is opened, the operating handle cannot drive the moving component in the first driving device to reset under the action of an external force, so as to drive the lock catch component to be engaged with the trip catch component, and further drive the moving contact of the DC switch S1 to be in contact with the stationary contact.

[0121] In a possible implementation, in the case where it is detected that the inverter 1 fault is eliminated, the controller 13 can send a third driving signal to the first driving device. The first driving device drives the moving part in the first driving device to reset when receiving the third driving signal. After the moving part in the first driving device is reset, the operating handle is driven to buckle the jump buckle part with the lock buckle part under the action of an external force, and the moving contact of the direct current switch S1 is driven to contact the static contact.

[0122] The first driving device can be a control device capable of realizing the back-and-forth movement of the moving part between two positions, such as a release, a motor, etc. For example, the first driving device is a bistable release, and the moving part in the bistable release is a part that can be driven to move between two stable positions by a magnetic field. The second driving device can be a control device capable of realizing the movement of the moving part to at least one position, such as a release, a motor, etc. For example, the second driving device is an electromagnetic release. Of course, the first driving device can also be an electromagnetic release, and the second driving device can also be a bistable release.

[0123] For ease of understanding, the first driving device and the second driving device are both electromagnetic releases as an example, and the principle diagram of the direct current switch S1 shown in FIGS. 4-7 is used for example introduction. In combination with FIGS. 4-7, the direct current switch S1 includes an operating handle Lf, a moving contact K1, a static contact K2, a release TX1, a release TX2, and an operating mechanism, and the operating mechanism includes a transmission assembly, a lock buckle part, a jump buckle part, and a reset part.

[0124] For example, the transmission assembly can include a link structure OA, a link structure AB, a link structure BC, a link structure GJ, a link structure GE, and an elastic member GB, the reset part is EKF, the jump buckle part is DCH, and the lock buckle part is M. The link structure OA, the link structure AB, and the link structure BC constitute a linkage structure OABC, the link structure GJ and the link structure GE constitute a linkage structure GJE, and O, D, f, J, K, and Y all represent fixed hinge points. d1 represents the moving part in the release TX1, and d2 represents the moving part in the release TX2. The link structure EK and the link structure KF in the reset part EKF are in a rigid coupling relationship, and the link structure EK and the link structure KF rotate synchronously around point K.

[0125] It should be noted that in the embodiments of the present application, the reset part EKF only has a transmission relationship with the second driving device (the release TX2) and has no transmission relationship with the first driving device (the release TX1), that is, the moving part d2 of the release TX2 can be reset by controlling the reset part EKF, but the moving part d1 of the release TX1 cannot be reset.

[0126] In the process that the inverter 1 supplies power to the AC power grid, the DC switch S1 is in the closed state, corresponding to the switch state shown in FIG. 4. As shown in FIG. 4, the locking component M is buckled with the jumping component DCH, the movable contact K1 and the stationary contact K2 are in the contact state, the current position of the movable component d1 is x1 (the first position), and the current position of the movable component d2 is x1' (the third position). The controller 13 determines that the inverter 1 fails when the electrical parameter of the inverter 1 exceeds the first preset parameter range, wherein the electrical parameter of the inverter 1 includes the bus voltage value or the bus current value of the DC bus.

[0127] For example, the electrical parameter of the inverter 1 is the bus voltage value of the DC bus, and the first preset parameter range is greater than a first voltage value. The controller 13 determines that the inverter 1 fails when the bus voltage value of the DC bus is less than or equal to the first voltage value, which indicates that the DC bus is short-circuited.

[0128] For example, the electrical parameter of the inverter 1 is the bus current value of the DC bus, and the first preset parameter range is less than a first current value. The controller 13 determines that the inverter 1 fails when the bus current value of the DC bus is greater than or equal to the first current value, which indicates that the DC bus is short-circuited.

[0129] In the case of failure of the inverter 1, the controller 13 sends a first driving signal (such as a forward pulse) to the tripping device TX1. After that, as shown in FIG. 5, the tripping device TX1 drives the moving part d1 to move from the position x1 to the position x2 (second position) upon receiving the first driving signal, i.e. the position of the moving part d1 in FIG. 5, thereby driving the locking part M to rotate clockwise around the point Y, and the locking part M is tripped from the trip part DCH, so that the trip part DCH rotates counterclockwise. The point B moves right under the driving of the elastic potential energy stored in the elastic member GB, thereby driving the moving contact K1 to rotate clockwise quickly under the pulling of the linkage AB, and further driving the moving contact K1 and the static contact K2 to be in a separated state, so that the DC switch S1 is completed to be opened. Since the operating mechanism of the DC switch S1 is not provided with a reset part for the moving part d1 of the tripping device TX1, and the reset part EKF is only used as a reset part for the moving part d2 of the tripping device TX2, after the DC switch S1 is opened, even if the maintenance personnel manually push the operating handle Lf to rotate clockwise, thereby driving the point E to rotate clockwise, and further driving the linkage KF to rotate clockwise to reset the moving part, the moving part d1 cannot be reset (i.e. the moving part d1 is driven to move from the position x2 to the position x1) by operating the operating handle of the DC switch S1, and the moving part d1 will always be in the position x2, thereby causing the trip part DCH and the locking part M to be unable to be buckled by operating the operating handle of the DC switch S1, and further causing the DC switch S1 to be unable to be closed by operating the operating handle of the DC switch S1.

[0130] In the above case, after the DC switch S1 is opened, professional maintenance personnel is needed, and after the maintenance, the controller 13 can detect the electrical parameters of the inverter 1, and in the case that the electrical parameters of the inverter 1 are in the first preset parameter range, it is indicated that the failure of the inverter 1 is eliminated, and then the controller 13 sends a third driving signal (such as a reverse pulse) to the tripping device TX1. The tripping device TX1 drives the moving part d1 to move from the position x2 to the position x1 upon receiving the third driving signal, so as to reset the moving part d1. The locking part M rotates counterclockwise due to the reset of the moving part d1, and stops at the position shown in FIG. 6. Since the moving part d1 has been reset, the maintenance personnel can push the operating handle Lf to rotate clockwise, thereby driving the trip part DCH to rotate clockwise by the operating handle Lf, and the locking part M is buckled by the trip part DCH, i.e. the locking part M is buckled with the trip part DCH, corresponding to the position shown in FIG. 7. After that, the maintenance personnel pushes the operating handle Lf to rotate counterclockwise, so that the elastic member GB is pulled to the left side of the linkage BC, and the point B moves left under the pulling of the elastic member GB, and the linkage AB pushes the moving contact K1 to close downward, thereby driving the moving contact K1 and the static contact K2 to be in a closed state, corresponding to the switch state shown in FIG. 4, and the DC switch S1 is completed to be closed.

[0131] It can be understood that in the case of failure of the inverter 1, the controller 13 controls the DC switch S1 to be tripped by driving the moving part in the first driving device. Since the reset part of the moving part in the first driving device is not arranged in the DC switch S1, the maintenance personnel cannot make the DC switch S1 be closed by operating the handle of the DC switch S1. Only when the controller 13 detects that the failure of the inverter 1 is eliminated, the moving part in the first driving device is reset by the controller 13, and then the maintenance personnel can make the DC switch S1 be closed by operating the handle of the DC switch S1. Further, it can be ensured that the maintenance personnel cannot make the DC switch S1 be closed by operating the handle of the DC switch S1 before the failure is eliminated when the inverter 1 fails, and the inverter needs to be repaired by professional personnel, and then the controller 13 in the inverter detects and confirms, and then the DC switch S1 can be further closed, thereby ensuring the safety of the maintenance personnel.

[0132] In another implementation scenario, in the process that the inverter 1 supplies power to the AC power grid, in the case that the photovoltaic string or the connection line thereof fails (external failure of the inverter), the controller 13 sends a second driving signal to the second driving device. When the second driving signal is received, the second driving device drives the moving part in the second driving device to drive the locking part and the tripping part to be tripped, so that the moving contact and the static contact of the DC switch S1 are separated, that is, the DC switch S1 is tripped. After the DC switch S1 is tripped, the handle is driven by the reset part to reset the moving part in the second driving device under the action of external force, the tripping part and the locking part are engaged, and the moving contact and the static contact of the DC switch S1 are contacted. The second driving device can be a device capable of realizing one-way motion control, such as a tripping device, a motor, etc.

[0133] In order to facilitate understanding, the first driving device and the second driving device are both taken as tripping devices as an example, and the principle diagram of the DC switch S1 shown in FIGS. 4, 8 and 9 is introduced as an example.

[0134] In the process that the inverter 1 supplies power to the AC power grid, the DC switch S1 is in the closed state, which corresponds to the switching state shown in FIG. 4. As shown in FIG. 4, the current position of the moving part d1 is x1, and the current position of the moving part d2 is x1'. When the electrical parameter of the photovoltaic string exceeds the second preset parameter range, the controller 13 determines that the photovoltaic string or the connection line thereof fails, wherein the electrical parameter of the photovoltaic string includes the output voltage value, the output current value or the ground insulation impedance value of the photovoltaic string.

[0135] Exemplarily, the electrical parameter of the photovoltaic string is a reverse output current value, and the second preset parameter range is less than or equal to a second current value. When the reverse output current value of the photovoltaic string is greater than the second current value, the controller 13 determines that the photovoltaic string connected to the input end of the inverter 1 has a reverse connection or a short circuit, and then determines that the photovoltaic string or the connection line thereof has a fault. The second current value can be determined according to actual conditions, and the application does not make a specific limitation on this. Preferably, in order to discover the fault as early as possible and trigger the protection action of the DC switch S1 in time, the second current value can be a small value, such as 0.

[0136] Exemplarily, the electrical parameter of the photovoltaic string is an output voltage value, and the second preset parameter range is greater than a second voltage value. When the output voltage value of the photovoltaic string is less than or equal to the second voltage value, the controller 13 determines that the photovoltaic string or the connection line thereof connected to the input end of the inverter 1 has a short circuit, and then determines that the photovoltaic string or the connection line thereof has a fault.

[0137] Exemplarily, the electrical parameter of the photovoltaic string is a ground insulation impedance value, and the second preset parameter range is a safe range of the ground insulation impedance value when there is no electrical connection between the electrical equipment or the line and the ground. When the ground insulation impedance value of the photovoltaic string exceeds the second preset parameter range, the controller 13 determines that the connection line of the photovoltaic string is insulated from the ground, and then determines that the photovoltaic string or the connection line thereof has a fault.

[0138] Subsequently, in the case that the photovoltaic string or the connection line thereof has a fault, the controller 13 sends a second driving signal to the tripping device TX2. Subsequently, as shown in FIG. 8, when the tripping device TX2 receives the second driving signal, the moving part d2 is driven to move from the position x1' to the position x2' (the fourth position), i.e., the position of the moving part d2 in FIG. 8, so as to drive the locking part M to rotate clockwise around the point Y, the locking part M is tripped from the trip part DCH, and the trip part DCH rotates counterclockwise. The point B moves to the right under the driving of the elastic potential energy stored by the elastic member GB, so as to drive the moving contact K1 to rotate clockwise quickly under the pulling of the connecting rod mechanism AB, and then the moving contact K1 and the stationary contact K2 are in a separated state, and the DC switch S1 is tripped.

[0139] Due to the reset component d2 arranged in the moving component d1 of the DC switch S1, after the DC switch S1 is tripped, the maintenance personnel can manually push the operating handle Lf to rotate clockwise based on the debugging requirement (for example, the maintenance personnel considers that the photovoltaic string or its connecting line fault has been ruled out), drive the E point to rotate clockwise, and further drive the connecting rod structure KF to rotate clockwise to drive the moving component d2 to return from the position x2' to the position x1', so as to reset the moving component d2. The locking component M rotates counterclockwise due to the reset of the moving component d2 and stops at the position shown in FIG. 9. After the moving component d2 is reset, the maintenance personnel can continue to push the operating handle Lf to rotate clockwise, drive the jump buckle component DCH to rotate clockwise by the operating handle Lf, and the locking component M is buckled by the jump buckle component DCH, that is, the locking component M is buckled with the jump buckle component DCH, corresponding to the position shown in FIG. 7. Then, the maintenance personnel pushes the operating handle Lf to rotate counterclockwise, so that the elastic member GB is pulled to the left side of the connecting rod structure BC, the B point moves to the left under the action of the elastic member GB, the connecting rod structure AB pushes the moving contact K1 to close downward, so that the moving contact K1 and the static contact K2 are in a closed state, corresponding to the switch state shown in FIG. 4, and the DC switch S1 is completed.

[0140] Further, in order to meet the debugging requirement that the DC switch can be manually closed when the maintenance personnel rules out the photovoltaic string and its connecting line fault, while avoiding the situation that the user directly closes the DC switch S1 multiple times when the photovoltaic string and its connecting line fault has not been ruled out, the controller 13 starts to count the number of times of sending the second driving signal to the tripping device TX2 after the photovoltaic string or its connecting line fault. If the number of times of sending the second driving signal does not exceed the preset threshold, if the maintenance personnel detects that the photovoltaic string or its connecting line is still faulty after manually closing, the second driving signal is continued to be sent to realize the tripping of the DC switch S1, and manual closing can be performed. If the number of times of sending the second driving signal is greater than the preset threshold, the second driving signal is stopped to be sent to the tripping device TX2, and the first driving signal is sent to the tripping device TX1, so that the DC switch S1 is tripped and cannot be closed manually, corresponding to the switch state shown in FIG. 5. For details, reference can be made to the control principle of the first driving signal in the foregoing. The preset threshold is determined based on the number of times of safe breaking of the DC switch and a margin, for example, the preset threshold is 3. In this way, it can be ensured that a certain number of manual closings are allowed to meet the debugging requirement in the case of photovoltaic string or its connecting line fault, and the fault is prevented from spreading due to multiple closings without ruling out the fault by the maintenance personnel.

[0141] In the embodiment of the present application, the DC switch S1 is provided with a first driving device for resetting the moving part and a second driving device for resetting the moving part by operating the handle, and the controller 13 controls the first driving device to open the DC switch S1 when the inverter 1 fails, and controls the second driving device to open the DC switch S1 when the photovoltaic string or its connecting line fails, so that the DC switch S1 cannot be manually closed when the inverter 1 fails, and the DC switch S1 can be manually closed within a preset number of times when the photovoltaic string or its connecting line fails, thereby effectively preventing the spread of the fault.

[0142] The two fault conditions of inverter failure and photovoltaic string or its connecting line failure will be described below. In the embodiment of the present application, the inverter failure is mainly caused by internal devices of the inverter, which can be referred to as internal inverter failure, and the photovoltaic string or its connecting line failure is caused by reverse connection, short circuit or overcurrent of the photovoltaic string or the line connected thereto, which can also be referred to as external inverter failure. In another aspect, the external inverter failure is mainly the failure that can be checked by maintenance personnel by checking the connection devices outside the inverter, and the internal inverter failure is the failure that needs to open the inverter to check and repair the internal devices.

[0143] Referring to FIG. 10, a possible fault detection method of the embodiment of the present application is described. In FIG. 10, m photovoltaic strings PV1-PVm are shown, and the positive and negative poles of PV1-PVm are connected to the connection ports of the inverter and then connected to n DC / DC converters through a certain parallel combination and then connected to the DC switch S1. The n DC / DC converters are connected in parallel to the DC bus (BUS+ and BUS-) and then connected to the DC / AC converter.

[0144] The two areas in the dashed box in FIG. 10 are the two main failure areas shown in the embodiment of the present application, which are: the failure of the m photovoltaic strings PV1-PVm and their lines, and the failure of the internal DC / DC converter, DC / AC converter and their lines of the inverter. The controller can detect the faults according to the detection data of the two areas, so that when a fault occurs, the corresponding first driving device or second driving device is driven to send a driving signal to control the DC switch S1 to be disconnected. For example, the fault detection method is as follows.

[0145] The determination method of inverter failure can be any one or more of the following:

[0146] 1) Obtain the bus voltage value Ubus between the positive and negative DC bus between the n DC / DC converters and the DC / AC converter, and if Ubus is less than or equal to the first voltage threshold, it is determined that the inverter fault occurs;

[0147] 2) Obtain the bus voltage value Ubus between the positive and negative DC bus, and also obtain the current value Imppt at the input end of each DC / DC converter, and if Ubus is less than or equal to the second voltage threshold and Imppt is greater than or equal to the first current threshold, it is determined that the inverter fault occurs. The value of Imppt can be determined by detecting the current at points b1 to bn in Figure 10. The first voltage threshold and the second voltage threshold can be equal.

[0148] The determination method of the photovoltaic string or the connected line fault can be any one or more of the following:

[0149] 1) Each PV is a branch, and the current on the branch is detected, for example, the current at points a1, a2 to an in Figure 10 can be detected. When a reverse current or / and a current value greater than or equal to the second current threshold is detected in a certain branch, it indicates that the photovoltaic string corresponding to the branch has a reverse connection or a short circuit fault, and then the photovoltaic string or the connected line fault is determined.

[0150] 2) The current at the input end of each DC / DC converter is detected, and when a reverse current or / and a current value greater than or equal to the third current threshold is detected at the input end, it indicates that there is a photovoltaic string reverse connection or short circuit fault, and then the photovoltaic string or the connected line fault is determined. For example, the current at points b1 to bn in Figure 10 is detected. The second current threshold and the third current threshold can be equal.

[0151] 3) The voltage at the input end of each DC / DC converter is obtained, for example, the voltage between points b1 and b2 to the voltage between points bn1 and bn1 in Figure 10 is detected. When the input end voltage of the DC / DC converter is greater than or equal to the second voltage threshold, it is determined that the photovoltaic string or the connected line fault causes the input end voltage of the DC / DC converter to be too high.

[0152] In addition to the above embodiments, another specific structure design of the DC switch is provided in the embodiments of the application. In this embodiment, the first driving device and the second driving device of the DC switch S1 are both tripping devices, the first driving device is specifically a second tripping device 37, and the first driving device is specifically a first tripping device 36. The following will be described in detail with reference to the accompanying drawings.

[0153] Figure 11 is a schematic diagram of a switch device according to an embodiment of the present application. In one embodiment, the switch device S1 can be a rotary disconnect switch. The switch device S1 includes a housing 30, an operating handle 31 and a plurality of stacked contact assemblies 33. The housing 30 is configured to accommodate an operating mechanism 32, a first trip unit 36 and a second trip unit 37. In one embodiment, the operating handle 31 can extend out of the housing 30 at an end away from the operating mechanism 32, so that an operator can push the operating handle 31 to perform closing and opening operations. In another embodiment, a knob 311 can be provided on an outer surface of the housing 30, so that the operator can manually operate the switch device S1 by rotating the knob 311. Specifically, the end of the operating handle 31 away from the operating mechanism 32 can be connected to the knob 311. When the operator manually operates the switch device S1, the operator can rotate the knob 311 to move the operating handle 31. In another embodiment, the switch device S1 can further include a remote controller and an electric operating device. The electric operating device can be connected to the operating handle 31 and the remote controller, so that the operator can remotely operate the switch device S1 by sending a closing command or an opening command to the remote controller. In this embodiment, the operator can be close to the switch device S1 to send the command, or the operator can send the command remotely through a communication device.

[0154] Figure 12 is a schematic diagram of an internal structure of the switch device according to an embodiment of the present application. Figure 13 is another schematic diagram of an internal structure of the switch device according to an embodiment of the present application. Figure 14 is an exploded schematic diagram of the switch device according to an embodiment of the present application. Referring to Figures 12-14, the operating handle 31, the operating mechanism 32, the first trip unit 36 and the second trip unit 37 are located in the housing 30. The contact assembly 33 includes a movable contact 331 and a stationary contact (not shown). Specifically, the operating handle 31 is in transmission connection with the operating mechanism 32. At least a portion of the operating handle 31 away from the operating mechanism 32 can extend out of the housing 30, so that an operator can perform closing and opening operations. The operating mechanism 32 is in transmission connection with the movable contact 331. The operating handle 31 is configured to control the operating mechanism 32 to move the movable contact 331, so that the movable contact 331 can be in contact with or separated from the stationary contact.

[0155] Specifically, in this embodiment, the operating mechanism 32 comprises the locking assembly 50 and the transmission mechanism 40. The locking assembly 50 comprises the pulling rod 34 and the locking rod 35, and the locking assembly 50 can be understood as a specific implementation of the locking component. The transmission mechanism 35 comprises a transmission assembly, a jump-off component and a reset component, and the transmission assembly, the jump-off component and the reset component can also be regarded as a large transmission mechanism as a whole. In order to distinguish, the transmission mechanism 35 will be described hereinafter. In one embodiment, the operating mechanism 32 further comprises a driving crank 324, the driving crank 324 is fixedly connected with the movable contact 331, and the driving crank 324 is driven by the transmission mechanism 35 to rotate the movable contact 331. The specific arrangement of the driving crank 324 will be further described hereinafter.

[0156] FIG. 15 is a schematic view of the cooperation of the pulling rod, the locking rod and the transmission mechanism provided in the embodiment of the present application, and FIG. 16 is a schematic view of the cross section of the pulling rod, the locking rod and the transmission mechanism along the direction of X-X in FIG. 15. As shown in FIG. 15 and FIG. 16, the pulling rod 34 and the locking rod 35 are arranged close to the transmission mechanism 34, and the pulling rod 34 and the locking rod 35 are relatively rotatable with the housing 30, respectively. The rotation center A of the pulling rod 34 and the rotation center B of the locking rod 35 do not overlap. The transmission mechanism 35 comprises a jump-off component HE and a rocker arm FG, and the jump-off component HE is in transmission connection with the rocker arm FG. The jump-off component HE can be understood as a specific implementation of the jump-off component, and the rocker arm FG can be understood as a specific implementation of the reset component. The jump-off component HE, the rocker arm FG and the locking assembly 50 are relatively rotatable with the housing 30, respectively. The jump-off component HE is in transmission connection with the rocker arm FG, and the transmission assembly will be further described hereinafter. The locking rod 35 is used to be buckled with or separated from the jump-off component HE. The pulling rod 34 is located on the side of the locking rod 35 away from the jump-off component HE, and the pulling rod 34 is in abutment with the locking rod 35.

[0157] FIG. 17 is a schematic view of the pulling rod and the locking rod provided in the embodiment of the present application, and FIG. 18 is another schematic view of the pulling rod and the locking rod provided in the embodiment of the present application. As shown in FIG. 17 and FIG. 18, the locking rod 35 is provided with a recess 351. In combination with FIG. 16, the jump-off component HE is provided with a hook 352 on the side close to the locking rod 35. The hook 352 can be hooked in the recess 351, so as to realize the buckling of the locking rod 35 with the jump-off component HE.

[0158] FIG. 19 is a schematic view of the pulling rod, the locking rod and the jumper in a first position of the locking assembly according to an embodiment of the present application, and FIG. 20 is an enlarged view of the pulling rod and the locking rod in FIG. 19. As shown in FIGS. 19 and 20, when the locking assembly 50 is in the first position, the locking assembly 50 is in a latched state with the jumper HE, so that the operating handle 31 can control the operating mechanism 32 to move the movable contact 331, thereby making the movable contact 331 contact or separate from the stationary contact. Specifically, the first surface S1 of the pulling rod 34 abuts against the locking rod 35, so that the locking rod 35 is in the latched state with the jumper HE. FIG. 21 is a schematic view of the pulling rod, the locking rod and the jumper in a second position of the locking assembly according to an embodiment of the present application, and FIG. 22 is an enlarged view of the pulling rod and the locking rod in FIG. 21. As shown in FIGS. 21 and 22, when the locking assembly 50 is in the second position, the locking assembly 50 is in an unlatched state with the jumper HE, so that the operating handle 31 is unlatched from the transmission mechanism 35, and the operating handle 31 cannot control the operating mechanism 32 to move the movable contact 331, and the movable contact 331 is kept in a separated state from the stationary contact. Specifically, the second surface S2 of the pulling rod 34 abuts against the locking rod 35, and the locking rod 35 is in the unlatched state with the jumper HE. The first surface S1 and the second surface S2 of the pulling rod 34 are adjacently arranged. The first unlatching device 36, or the first unlatching device 36 and the second unlatching device 37, can drive the pulling rod 34 to rotate counterclockwise around the point A, so that the locking assembly is rotated from the first position to the second position. In the process of rotating the locking assembly from the first position to the second position, the pulling rod 34 drives the locking rod 35 to rotate counterclockwise around the point B, the locking rod 35 slides from the first surface S1 to the second surface S2 of the pulling rod 34, and finally the locking rod 35 is separated from the jumper HE.

[0159] FIG. 23 is an exploded schematic view of the pulling rod, the locking rod and the transmission mechanism according to an embodiment of the present application. As shown in FIGS. 15, 16 and 23, the operating mechanism 32 further includes a first mounting plate 321 and a second mounting plate 322. In this embodiment, the transmission assembly in the transmission mechanism specifically includes an input crank COD, an input link DF, an upper link HJ, a lower link JK, an output crank KO’L’, an output shaft LL’ and a first spring 323. The first mounting plate 321 and the second mounting plate 322 are oppositely arranged, and the first mounting plate 321 and the second mounting plate 322 are respectively fixed to the housing 30. The operating handle 31 passes through the first mounting plate 321 and the second mounting plate 322, and one end of the operating handle 31 is located on the side of the first mounting plate 321 away from the second mounting plate 322. The input crank COD and the input link DF are both located on the side of the first mounting plate 321 away from the second mounting plate 322. The jumper HE, the rocker arm FG, the upper link HJ, the lower link JK and the output crank KO’L’ are all located between the first mounting plate 321 and the second mounting plate 322.

[0160] Figure 24 is another schematic view of the traction rod, the locking rod and the transmission mechanism according to the embodiment of the present application. As shown in Figure 24, the operating handle 31 can be rotated clockwise or counterclockwise relative to the first mounting plate 321 and the second mounting plate 322. The input crank COD is sleeved on the operating handle 31, and the input crank COD is fixedly connected with the operating handle 31. In this way, when the operating handle 31 is rotated, the input crank COD can be rotated relative to the first mounting plate 321 about the point O along with the operating handle 31. One end of the input connecting rod DF is rotatably connected with the input crank COD at the point D, and the other end of the input connecting rod DF is rotatably connected with the rocker arm FG at the point F. The rocker arm FG is rotatably connected with the first mounting plate 321 and the second mounting plate 322 at the point G, so that the rocker arm FG can be rotated relative to the first mounting plate 321 and the second mounting plate 322 about the point G. The rocker arm FG is provided with a reset driving part 328, which is used to drive the driving part of the first tripping device 36 to reset, so as to reset the locking assembly 50, so that the operating handle 31 can make the locking rod 35 reengage with the jumper HE.

[0161] In one embodiment, the traction rod 34 is provided with a reset member, which is used to drive the locking assembly 50 to rotate from the second position to the first position. In this way, after the first tripping device 36 is reset to be separated from the traction rod 34 by the reset driving part 328, the locking assembly 50 can be reset to the first position under the action of the reset member, so as to wait for the locking rod 35 to reengage with the jumper HE, so that the locking rod 35 can engage with the traction rod 34 when the operating handle 31 drives the operating mechanism 32 to move, so that the switch device S1 can be closed and opened.

[0162] Figure 25 is another schematic view of the traction rod, the locking rod and the transmission mechanism according to an embodiment of the present application, and Figure 26 is another schematic view of the traction rod, the locking rod and the transmission mechanism according to an embodiment of the present application. As shown in Figures 25 and 26, the jumper HE is rotatably connected to the first mounting plate 323 and the second mounting plate 324 at point E, respectively, such that the jumper HE can rotate relative to the first mounting plate 321 and the second mounting plate 322 about point E. The jumper HE is rotatably connected to one end of the upper link HJ at point H. The other end of the upper link HJ is rotatably connected to one end of the lower link JK at point J. The other end of the lower link JK is rotatably connected to the output crank KO’L’ at point K. The output crank KO’L’ is coaxially arranged with the operating handle 31, and the output crank KO’L’ can rotate relative to the second mounting plate 322 about point O’. The output shaft LL’ is fixedly connected to the output crank KO’L’ at point L. The first mounting plate 321 is provided with a first sliding slot 3211, and the second mounting plate 322 is provided with a second sliding slot 3221. As shown in Figures 23 and 25, the output shaft LL’ passes through the first sliding slot 3211 and the second sliding slot 3221, and the output shaft LL’ can simultaneously slide in the first sliding slot 3211 and the second sliding slot 3221. One end of the first spring 323 is fixedly connected to the rocker arm FG at point P. The upper link HJ and the lower link JK are rotatably connected at point J by a rotating shaft, and the other end of the first spring 323 can be fixedly connected to the rotating shaft at point J.

[0163] As shown in Figures 13 and 14, the operating mechanism 32 further comprises a drive crank 324 located on the side of the second mounting plate 322 away from the first mounting plate 321. The drive crank 324 is coaxially arranged with the operating handle 31, and the drive crank 324 can rotate relative to the second mounting plate 322 about point O’. One end of the output shaft LL’ passes through the second sliding slot 3221 and is fixedly connected to the drive crank 324, such that when the output shaft LL’ slides in the second sliding slot 3221, the drive crank 324 rotates about point O’ following the output shaft LL’. The drive crank 324 is fixedly connected to the movable contact 331, such that the drive crank 324 can drive the movable contact 331 to rotate.

[0164] With continued reference to FIG. 22, the first trip unit 36 includes a first drive component 360, which can be understood as a moving component in the first trip unit 36. The first trip unit 36 is configured to drive the first drive component 360 to drive the lock assembly 50 from the first position to the second position according to a first drive signal, so as to keep the lock assembly 50 and the hook HE in a disengaged state. When the operating handle 31 drives the rocker arm FG to rotate towards the first trip unit 36, the reset drive 328 moves towards the first drive component 360 and drives the first drive component 360 to reset, so as to enable the lock assembly 50 to reset from the second position to the first position. While the operating handle 31 drives the rocker arm FG to rotate towards the first trip unit 36, the rocker arm FG can drive the hook HE to rotate towards the lock assembly 50, so as to enable the operating handle 31 to control the operating mechanism 32 to drive the movable contact 331 to move. The second trip unit 37 includes a second drive component 370, which can be understood as a moving component in the second trip unit 37. The second trip unit 37 is configured to lock the movement of the operating mechanism 32 according to a second drive signal, so as to prevent the operating handle 31 from controlling the operating mechanism 32 to drive the movable contact 331 to move, and keep the movable contact 331 and the stationary contact in a separated state.

[0165] The closing, opening and tripping of the switch device S1 will be described in detail below. The opening state here mainly refers to the state when the handle 31 is manually operated to open, i.e., the operation of the handle 31 does not involve the trip unit. For the sake of distinction, the opening of the switch device by the trip unit is also referred to as tripping in the embodiments.

[0166] Fig. 27 is a schematic view of the switch device in a closed state according to an embodiment of the present application, and Fig. 28 is a partial schematic view of the switch device in Fig. 27. As shown in Figs. 27 and 28, the switch device S1 is in a closed state, and the moving contact 331 is in contact with the static contact. At this moment, the locking assembly 50 is in the first position, and the hook 352 hooks the groove 351, so that the locking lever 35 is buckled with the jumper HE. In this way, the jumper HE is kept stationary. One end of the first spring 323 is at point P, and point P is located at the right side of the upper link HJ, and the other end of the first spring 323 is at point J, so that the first spring 323 exerts a rightward force on the rotation axis of point J, thereby driving point J to move upward to the right. If the rocker arm FG continues to rotate clockwise around point G from the position in Fig. 20, point P can continue to move to the right. In this case, the lower link JK has a tendency to rotate clockwise around O' under the action of the first spring 323, i.e., point K has a tendency to rotate clockwise around O', so that the output crank KO'L' has a tendency to rotate clockwise around point O'. However, the first sliding groove 3211 and the second sliding groove 3221 limit the rotation of the output shaft LL', thereby limiting the movement of the output crank KO'L', the lower link JK, the upper link HJ and the rocker arm FG in turn, so that the rocker arm FG is kept in the position in Fig. 20, keeping the switch device S1 in the closed state.

[0167] Fig. 29 is a schematic view of the switch device in an open state according to an embodiment of the present application, and Fig. 30 is a partial schematic view of the switch device in Fig. 29. As shown in Figs. 29 and 30, the switch device S1 is in an open state, and the moving contact 331 is separated from the static contact. At this moment, the locking assembly is in the first position, and the hook 352 hooks the groove 351, so that the locking lever 35 is buckled with the jumper HE. In this way, the jumper HE is kept stationary.

[0168] When the switch device S1 switches from the closed state to the open state, the operating handle 31 rotates counterclockwise around point O, thereby driving the input crank COD to rotate counterclockwise around point O together with the operating handle 31. In the process of counterclockwise rotation of the input crank COD, point D moves to the right and drives point F to move upward to the right, thereby driving the rocker arm FG to rotate counterclockwise around point G. In the process of counterclockwise rotation of the rocker arm FG around point G, point P of the first spring 323 moves from the right side of the upper link HJ to the left side of the upper link HJ. When point P is located at the left side of the upper link HJ, the first spring 323 exerts a leftward force on the rotation axis of point J, thereby driving point J to move upward to the left, and thereby driving the lower link JK to rotate counterclockwise. In the process of counterclockwise rotation of the lower link JK, the output crank KO'L' rotates clockwise around point O', thereby driving the moving contact 331 to rotate clockwise and separate from the static contact.

[0169] When the switch device S1 is switched from the open state to the closed state, the operating handle 31 rotates clockwise around the O point, thereby driving the input crank COD to rotate clockwise around the O point. In the process of the clockwise rotation of the input crank COD, the D point moves leftward and drives the F point to move leftward and downward, thereby driving the rocker arm FG to rotate clockwise around the G point. In the process of the clockwise rotation of the rocker arm FG around the G point, the P point of the first spring 323 moves from the left side of the upper connecting rod HJ to the right side of the upper connecting rod HJ. When the P point is located at the right side of the upper connecting rod HJ, the first spring 323 exerts a rightward force on the rotation shaft of the J point, thereby driving the J point to move rightward and downward, and further driving the lower connecting rod JK to rotate clockwise. In the process of the clockwise rotation of the lower connecting rod JK, the output crank KO’L’ rotates counterclockwise around the O’ point, thereby driving the movable contact 331 to rotate counterclockwise and contact the static contact.

[0170] FIG. 31 is a schematic view of the switch device in a tripped state according to an embodiment of the present application, and FIG. 32 is a partial schematic view of the switch device in FIG. 31. As shown in FIGS. 31 and 32, the switch device S1 is in the tripped state, and the movable contact 331 and the static contact are separated. At this time, the traction rod 34 is located at the second position, and the hook 352 is disengaged from the groove 351, so that the locking rod 35 is disengaged from the trip latch HE. When the switch device S1 is switched from the closed state to the tripped state, the first tripping device 36 and / or the second tripping device 37 drives the traction rod 34 to rotate counterclockwise around the A point, thereby reducing the force of the traction rod 34 abutting against the locking rod 35, so that the locking rod 35 rotates counterclockwise around the B point, and further so that the locking rod 35 is disengaged from the trip latch HE. At the moment when the trip latch HE is disengaged from the locking rod 35, the trip latch HE rotates clockwise around the E point, thereby driving the H point to move rightward. In the process of the clockwise rotation of the trip latch HE, the upper connecting rod HJ is driven to rotate clockwise, thereby driving the J point to move leftward and upward, and further driving the lower connecting rod JK to rotate counterclockwise. In the process of the counterclockwise rotation of the lower connecting rod JK, the output crank KO’L’ rotates clockwise around the O’ point, thereby driving the movable contact 331 to rotate clockwise and separate from the static contact, and achieving the tripping of the switch device S1.

[0171] When the switch device S1 is switched from the tripped state to the off state, the reset of the first driving component 360 and the buckling of the locking lever 322 and the trip lever HE are simultaneously achieved by rotating the operating handle 31. Specifically, the driving operating handle 31 is counterclockwise rotated around the O point, thereby driving the input crank COD to follow the operating handle 31 to rotate counterclockwise around the O point. In the process of counterclockwise rotating of the input crank COD, the D point moves to the right and the F point moves to the right and up, thereby driving the rocker arm FG to rotate counterclockwise around the G point. In the process of counterclockwise rotating of the rocker arm FG, the reset driving part 328 drives the first driving component 360 of the first tripping device 36 to reset; at the same time, the rocker arm FG drives the trip lever HE to rotate counterclockwise around the E point through the first spring 323, so that the hook 3222 hooks the groove 3221, and the locking lever 322 and the trip lever HE are buckled. In this way, the switch device S1 is switched from the tripped state to the off state.

[0172] In the DC switch S1 of the embodiment of the present application, when the locking assembly 50 is located at the first position, the traction lever 34 can abut against the locking lever 35 and keep the locking lever 35 buckled with the trip lever HE, so that the operating handle 31 can control the operating mechanism 32 to drive the moving contact 331 to move, thereby making the moving contact 331 contact or separate from the static contact. When the locking assembly 50 is located at the second position, the locking lever 35 is separated from the trip lever HE, so that the operating handle 31 is decoupled from the operating mechanism 32, and the moving contact 331 is kept separated from the static contact.

[0173] When a fault occurs outside the inverter, the controller 21 sends a first driving signal to the first tripping device 36. The first tripping device 36 is configured to drive the locking assembly 50 to rotate from the first position to the second position according to the first driving signal, so that the locking lever 35 is kept separated from the trip lever HE. In this way, the operating handle 31 cannot control the operating mechanism 32 to drive the moving contact 331 to move, thereby keeping the moving contact 331 and the static contact in a separated state. After the fault is solved, the driving operating handle 31 can reset the rocker arm FG to the first driving component 360, so that the locking assembly 50 can be reset from the second position to the first position, so that the locking lever 35 can be buckled with the trip lever HE when the operating handle 31 drives the operating mechanism 32 to move. Therefore, after the user detects or the system self-checks, and after other faults are solved, the user or the system can close the switch device 30 by itself, thereby restoring the electrical connection between the photovoltaic assembly and the inverter circuit.

[0174] When a fault occurs inside the inverter, the controller 21 sends a second driving signal to the second tripping device 37. The second tripping device 37 is configured to drive the locking assembly 50 to rotate from the first position to the second position according to the second driving signal, so that the locking lever 35 is kept disengaged from the hook HE. In one embodiment, when the fault is solved, the driving handle 31 is driven to reset the second driving component 370 of the rocker arm FG, so that the locking assembly can be reset from the second position to the first position, and the locking lever 35 can be engaged with the hook HE when the handle 31 drives the operating mechanism 32 to move. In another embodiment, when the fault is solved, the controller 21 sends a reset signal (third driving signal) to the switch device 30. The second tripping device 37 is configured to reset the second driving component 370 according to the reset signal, so that the locking assembly can be reset from the second position to the first position, and the locking lever 35 can be engaged with the hook HE when the handle 31 drives the operating mechanism 32 to move. Therefore, after the maintenance personnel solve the internal fault, the maintenance personnel close the switch device 30 to restore the electrical connection between the photovoltaic assembly and the inverter circuit. In this way, the user can avoid closing the switch device 30 without solving the internal problem, and prevent the inverter from being damaged.

[0175] The second tripping device 37 described above can realize the tripping of the handle 31 and the operating mechanism 32 by switching the position of the locking assembly 50. The principle of driving the traction rod 34 by the second driving component 370 is similar to that of driving the traction rod 34 by the first driving component 360, which will not be described here. When the switch device 30 is switched from the tripped state to the open state, the reset of the second driving component 370 and the engagement of the locking lever 322 and the hook HE are realized by rotating the handle 31. Specifically, the handle 31 is rotated counterclockwise around the O point, thereby driving the input crank COD to rotate counterclockwise around the O point. During the counterclockwise rotation of the input crank COD, the D point moves to the right and the F point moves to the upper right, thereby driving the rocker arm FG to rotate counterclockwise around the G point. During the counterclockwise rotation of the rocker arm FG, the reset driving component 328 drives the second driving component 370 of the second tripping device 37 to reset; at the same time, the rocker arm FG drives the hook HE to rotate counterclockwise around the E point through the first spring 323, so that the hook 3222 hooks the groove 3221, and the locking lever 322 is engaged with the hook HE. In this way, the switch device 30 is switched from the tripped state to the open state.

[0176] In another embodiment, the second tripping device 37 can also lock the operating mechanism 32 by locking the movement of the transmission mechanism 40, so that the second tripping device 37 keeps the locking operating state before the fault is removed, and manual operation cannot close the circuit, thereby ensuring the safety of the circuit. In this embodiment, when the internal fault and / or external fault occurs in the inverter, the controller 21 sends a driving signal to the direct current switch S1, and the first tripping device 36 drives the traction rod 34 to rotate according to the corresponding driving signal, and the second tripping device 37 locks the transmission mechanism 40 according to the corresponding driving signal.

[0177] In the embodiments of the present application, the first tripping device 36 and the second tripping device 37 can both be electromagnetic tripping devices. FIG. 33 is a schematic view of an electromagnetic tripping device provided in the embodiments of the present application, and FIG. 34 is a schematic view of an electromagnetic tripping device provided in the embodiments of the present application. As shown in FIGS. 33 and 34, the electromagnetic tripping device 41 can include a moving iron core 411, a stationary iron core 412, a first permanent magnet 413, a first coil 414, and a second spring 415. The stationary iron core 412 has a first accommodating space, one end of the moving iron core 411, the first permanent magnet 413, and the first coil 414 are located in the first accommodating space, the first permanent magnet 413 is located at one end of the moving iron core 411, and the first coil 414 is sleeved on the moving iron core 411. The other end of the moving iron core 411 extends out of the first accommodating space and is arranged towards the traction rod 34. The second spring 415 is sleeved on the other end of the moving iron core 411, one end of the second spring 415 is fixed opposite to the stationary iron core 412, and the other end of the second spring 415 is fixed opposite to the other end of the moving iron core 411. The electromagnetic tripping device 41 is used to make the first coil 414 be electrified and generate a first induced magnetic field opposite to the magnetic field direction of the first permanent magnet 413 according to the first driving signal and / or the second driving signal, so as to make the moving iron core 411 move towards the traction rod 34 (the vertical upward direction in FIGS. 33 and 34) under the action of the second spring 415, and drive the locking assembly to rotate from the first position to the second position. When the electromagnetic tripping device 41 is in the initial state (as shown in FIG. 33), the first permanent magnet 413 magnetically attracts the moving iron core 411 and compresses the second spring 415. When the first coil 414 is electrified, the first induced magnetic field generated by the first coil 414 offsets the magnetic field of the first permanent magnet 413, and therefore the second spring 415 drives the above-mentioned other end of the moving iron core 411 to move away from the stationary iron core 412, so as to make the moving iron core 411 move towards the traction rod 34 (as shown in FIG. 34). When the first driving signal or the second driving signal disappears, the first coil 414 is not electrified, and the moving iron core 411 remains in the position abutting against the traction rod 34. The switch device S1 can manually drive the moving iron core 411 to move reversely, so that the first permanent magnet 413 magnetically attracts the moving iron core 411 and compresses the second spring 415.

[0178] The above embodiments mainly reset the moving part in the second driving device by the reset part, so that the operating handle can drive the snap part to engage with the locking part under the action of external force, and the operating handle can drive the transmission assembly to drive the moving contact to contact the static contact. In some implementation scenarios, the moving part of the first driving device or / and the second driving device can be reset by other methods, such as manually pushing the reset part through an external maintenance hole, and in this case, the transmission mechanism can be further locked to avoid manual misoperation of closing under the condition of inverter internal fault.

[0179] In one embodiment, the moving iron core 411 of the second release 37 can lock the movement of the transmission mechanism. FIG. 35 is a partial schematic view of the second release and the operating mechanism provided in the embodiment of the application, and FIG. 36 is another partial schematic view of the second release and the operating mechanism provided in the embodiment of the application. As shown in FIGS. 35 and 36, in another embodiment, the second release 37 is located on the side of the second mounting plate 322 away from the first mounting plate 321, and the other end of the moving iron core 411 is arranged towards the second mounting plate 322. When the moving iron core 411 of the second release 37 moves away from the static iron core 412, the moving iron core 411 extends between the rocker arm FG and the first mounting plate 321 or between the rocker arm FG and the second mounting plate 322 to limit the rotation of the rocker arm FG, thereby locking the position of the rocker arm FG. FIG. 37 is another partial schematic view of the second release and the operating mechanism provided in the embodiment of the application, and FIG. 38 is another partial schematic view of the second release and the operating mechanism provided in the embodiment of the application. As shown in FIGS. 37 and 38, in another embodiment, the second release 37 is located on the side of the second mounting plate 322 away from the first mounting plate 321, and the other end of the moving iron core 411 is arranged towards the second mounting plate 322. When the moving iron core 411 of the second release 37 moves away from the static iron core 412, the moving iron core 411 extends into the first sliding groove 3211 or the second sliding groove 322 to limit the sliding of the output shaft LL’ in the first sliding groove 3211 or the second sliding groove 322, thereby locking the position of the output shaft LL’.

[0180] In another embodiment, the second tripping device 37 can be a bistable tripping device. FIG. 39 is a schematic view of the second tripping device according to an embodiment of the present application. As shown in FIG. 39, the second tripping device 37 includes a coil winding 371, a first magnetic yoke 372, a second magnetic yoke 373, and a driving assembly 374. The coil winding 371 is fixed relative to the housing. The first magnetic yoke 372 and the second magnetic yoke 373 are oppositely arranged at two ends of the coil winding 371. The driving assembly 374 includes a magnetic assembly 3741 fixedly connected to a driving component 3742. The magnetic assembly 3741 is located between the first magnetic yoke 372 and the second magnetic yoke 373, and includes a first magnetic pole portion 37411 and a second magnetic pole portion 37412 oppositely arranged and having opposite magnetic poles. The first magnetic yoke 372 extends from one end of the coil winding 371 to between the first magnetic pole portion 37411 and the second magnetic pole portion 37412, and the second magnetic yoke 373 extends from the other end of the coil winding 371 to between the first magnetic pole portion 37411 and the second magnetic pole portion 37412. The driving component 3742 is in transmission connection with the traction rod 34. FIG. 40 is another schematic view of the second tripping device according to an embodiment of the present application. As shown in FIG. 40, the second tripping device 37 is configured to, according to a second driving signal, cause the coil winding 371 to be energized and generate a first induced magnetic field, so as to cause the first magnetic yoke 372 to generate an attractive force on the first magnetic pole portion 37411 and a repulsive force on the second magnetic pole portion 37412, and cause the second magnetic yoke 373 to generate a repulsive force on the first magnetic pole portion 37411 and an attractive force on the second magnetic pole portion 37412, so as to drive the magnetic assembly 3741 to rotate in a first rotation direction and drive the driving component 3742 to move, thereby causing the driving component 3742 to abut against the traction rod 34 and drive the locking assembly to rotate from the first position to the second position. FIG. 41 is another schematic view of the second tripping device according to an embodiment of the present application. As shown in FIG. 41, the second tripping device 37 is further configured to, according to a second reset signal (i.e., a third driving signal), cause the coil winding 371 to be energized and generate a second induced magnetic field, so as to cause the first magnetic yoke 372 to generate a repulsive force on the first magnetic pole portion 37411 and an attractive force on the second magnetic pole portion 37412, and cause the second magnetic yoke 373 to generate an attractive force on the first magnetic pole portion 37411 and a repulsive force on the second magnetic pole portion 37412, so as to drive the magnetic assembly 3741 to rotate in a second rotation direction and drive the driving component 3742 to move, thereby causing the locking assembly to be able to reset from the second position to the first position. In this embodiment, when an internal fault occurs in the inverter, even if the operating handle 31 is operated, the second tripping device 37 still causes the locking rod 35 to be disengaged from the jump lever HE, so that the operating mechanism 32 cannot drive the movable contact 331 to move, resulting in that the switch device 30 cannot be closed, thereby improving the stability of the switch device 30 in the tripped state. After the internal fault is solved, the second tripping device 37 resets, so that the locking assembly can reset to the first position and be kept in the first position.Therefore, when the operating handle 31 drives the operating mechanism 32 to move, the locking lever 35 can be engaged with the trip lever HE, so that the closing and opening of the switch device 30 can be realized by operating the handle 31, and the stability of the switch device 30 in the normal working state is improved. The stability of the switch device 30 in the tripping state and the normal working state can be realized by changing the current direction of the coil winding 371 when energized, so that the bistable state of the switch device 30 is realized.

[0181] In the switch device 30 described above, the driving component 3742 includes a rotating rod 37421 and a pushing rod 37422. The rotating rod 37421 rotates relative to the shell, the rotating rod 37421 is fixedly connected with the magnetic assembly 3741, and the rotating rod 37421 is movably connected with the pushing rod 37422. The pushing rod 37422 is slidably connected with the shell. The magnetic assembly 3741 is used to drive the rotating rod 37421 to rotate, so as to drive the pushing rod 37422 to move towards the traction rod 34 and abut against the traction rod 34, thereby driving the locking assembly to rotate from the first position to the second position, and to drive the pushing rod 37422 to move away from the traction rod 34 and disengage from the traction rod 34, so that the locking assembly can be reset from the second position to the first position. In this embodiment, the induced magnetic field generated by the coil winding 371 acts on the first magnetic pole part 37411 and the second magnetic pole part 37412 through the first magnetic yoke 372 and the second magnetic yoke 373, so as to drive the magnetic assembly 3741 to move. During the movement of the magnetic assembly 3741, the rotating rod 37421 rotates with the magnetic assembly 3741, and drives the pushing rod 37422 to slide, i.e. converts the rotating movement into sliding movement, so that the pushing rod 37422 moves towards or away from the traction rod 34.

[0182] The movable connection between the pushing rod 37422 and the rotating rod 37421 described above can be realized by simple structural design. In one embodiment, the pushing rod 37422 has an opening, and the rotating rod 37421 has a protrusion. The protrusion is accommodated in the opening, and the movable connection between the pushing rod 37422 and the rotating rod 37421 is realized by rotating in the opening.

[0183] Fig. 42 is another schematic view of the second tripping device according to an embodiment of the present application, and Fig. 43 is another schematic view of the second tripping device according to an embodiment of the present application. As shown in Figs. 42 and 43, in another embodiment, the driving component 3742 includes a rotating rod 37421. The rotating rod 37421 rotates relative to the housing, and the rotating rod 37421 is fixedly connected with the magnetic assembly 3741 and fixedly connected with the traction rod 34. The magnetic assembly 3741 is configured to drive the rotating rod 37421 to rotate, so as to drive the lock assembly to rotate from the first position to the second position and to rotate from the second position to the first position. In this embodiment, the induced magnetic field generated by the coil winding 371 acts on the first magnetic pole portion 37411 and the second magnetic pole portion 37412 through the first magnetic yoke 372 and the second magnetic yoke 373, so as to drive the magnetic assembly 3741 to move. In the movement process of the magnetic assembly 3741, the rotating rod 37421 rotates with the magnetic assembly 3741, and directly drives the traction rod 34 to rotate, so as to directly drive the lock assembly to rotate between the first position and the second position.

[0184] Fig. 44 is another schematic view of the second tripping device according to an embodiment of the present application, and Fig. 45 is an exploded schematic view of the second tripping device according to an embodiment of the present application. As shown in Figs. 44 and 45, in another embodiment, the bistable tripping device of the second tripping device 37 can also have other structures. Specifically, the second tripping device 37 includes a moving shaft 375, a second coil 376, a third coil 377, a second permanent magnet 378, and a third permanent magnet 379. The moving shaft 375 is relatively slidably connected to the housing, and the moving shaft 375 is drivingly connected to the traction rod 34. The second coil 376 and the third coil 377 are connected in series and are arranged around the outer periphery of the moving shaft 375. The second permanent magnet 378 and the third permanent magnet 379 are relatively fixed to the housing and are located between the second coil 376 and the third coil 377. Along the sliding direction of the moving shaft 375, the second permanent magnet 378 and the third permanent magnet 379 are located on the two sides of the moving shaft 375. The magnetic path direction of the magnetic field in the second permanent magnet 378 is opposite to the magnetic path direction of the magnetic field in the third permanent magnet 379 and is perpendicular to the sliding direction. Fig. 46 is another schematic view of the second tripping device according to an embodiment of the present application. As shown in Fig. 46, in the portion of the moving shaft 375 located on the side of the second permanent magnet 378 facing the second coil 376, the magnetic path direction of the magnetic field generated by the second permanent magnet 378 and the third permanent magnet 379 is a first direction. In the portion of the moving shaft 375 located on the side of the second permanent magnet 378 facing the third coil 377, the magnetic path direction of the magnetic field generated by the second permanent magnet 378 and the third permanent magnet 379 is a second direction. The first direction is opposite to the second direction, and the first direction and the second direction are parallel to the sliding direction. The second tripping device 37 is configured to, according to a second driving signal, cause the second coil 376 and the third coil 377 to be energized and generate a first induced magnetic field, so that the magnetic path direction of the first induced magnetic field in the moving shaft 375 is the same as the first direction and opposite to the second direction, so that the moving shaft 375 slides in the first direction and abuts against the traction rod 34, thereby causing the locking assembly to rotate from the first position to the second position. The second tripping device 37 is also configured to, according to a second reset signal, cause the second coil 376 and the third coil 377 to be energized and generate a second induced magnetic field, so that the magnetic path direction of the second induced magnetic field in the moving shaft 375 is the same as the second direction and opposite to the first direction, so that the moving shaft 375 slides in the second direction and is separated from the traction rod 34, thereby enabling the locking assembly to reset from the second position to the first position. In this embodiment, when an internal fault occurs, even if the operating handle 31 is operated, the tripping device still causes the traction rod 34 to be separated from the locking rod 35, so that the operating mechanism 32 cannot drive the movable contact 331 to move, causing the switch device 30 to be unable to close, thereby improving the stability of the switch device 30 in the tripped state. After the internal fault is solved, the locking assembly can reset to the first position and remain in the first position.Therefore, when the operating handle 31 drives the operating mechanism 32 to move, the locking rod 35 can be buckled with the jumper HE, so that the closing and opening of the switch device 30 can be realized by operating the handle 31, and the stability of the switch device 30 in the normal working state is improved. By changing the current direction of the coil winding when energized, the stability of the switch device 30 in the tripping state and the normal working state can be realized, thereby realizing the bistable state of the switch device 30.

[0185] In the switch device 30 described above, the second tripping device 37 can further include a mounting plate 380 and a third magnetic yoke 381. The mounting plate 380 is fixed relative to the housing, and the third magnetic yoke 381 is a U-shaped magnetic yoke. The mounting plate 380 covers the opening of the U-shaped magnetic yoke and forms a second containing space. The moving shaft 375, the first coil, the second coil 376, the first permanent magnet and the second permanent magnet 378 are located in the second containing space. In one embodiment, the mounting plate 380 is located on the side of the U-shaped magnetic yoke close to the traction rod 34, and the mounting plate 380 is provided with a first opening 3801. One end of the moving shaft 375 passes through the first opening 3801 and extends out of the second containing space. In another embodiment, the mounting plate 380 is located on the side of the U-shaped magnetic yoke away from the traction rod 34. The U-shaped magnetic yoke includes two parallel side walls and a bottom wall connecting the two side walls, and the bottom wall is arranged opposite to the mounting plate 380. The bottom wall is provided with a second opening 3811. One end of the moving shaft 375 passes through the second opening 3811 and extends out of the second containing space. In another embodiment, the mounting plate 380 is provided with a first opening 3801. The U-shaped magnetic yoke includes two parallel side walls and a bottom wall connecting the two side walls, and the bottom wall is arranged opposite to the mounting plate 380. The bottom wall is provided with a second opening 3811. One of the first opening 3801 and the second opening 3811 is arranged close to the traction rod 34. One end of the moving shaft 375 passes through the first opening 3801 and extends out of the second containing space, and the other end passes through the second opening 3811 and extends out of the second containing space. In the above embodiments, when the second coil 376 and the third coil 377 are energized, the third magnetic yoke 381 can diffuse the induced magnetic field generated by the second coil 376 and the third coil 377 to the entire second containing space, so that the induced magnetic field can cover the moving shaft 375 described above.

[0186] Similarly, when the second tripper 37 is a bistable tripper, in one embodiment, the toggle lever 37422 or the moving shaft 375 of the second tripper 37 can directly switch the position of the traction lever 34. In another embodiment, the toggle lever 37422 or the moving shaft 375 of the second tripper 37 can extend into the rocker arm FG and between the first mounting plate 321 and the second mounting plate 322 to limit the rotation of the rocker arm FG, thereby locking the position of the rocker arm FG. In another embodiment, when the moving iron core 411 of the second tripper 37 moves away from the static iron core 412, the toggle lever 37422 or the moving shaft 375 of the second tripper 37 can extend into the first sliding groove 3211 or the second sliding groove 322 to limit the sliding of the output shaft LL' in the first sliding groove 3211 or the second sliding groove 322, thereby locking the position of the output shaft LL'. In another embodiment, the rotating lever 37421 of the second tripper 37 can be fixedly connected with the rocker arm FG, thereby directly limiting the rotation of the rocker arm FG through the rotating lever 37421, thereby locking the position of the rocker arm FG. In another embodiment, the rotating lever 37421 of the second tripper 37 can be fixedly connected with the output shaft LL', thereby directly limiting the sliding of the output shaft LL' in the first sliding groove 3211 and the second sliding groove 322 through the rotating lever 37421, thereby locking the position of the output shaft LL'.

[0187] FIG. 47 is a schematic diagram of the energization of the second tripper according to an embodiment of the present application. As shown in FIG. 47, when the second tripper 37 receives the second reset signal, the second coil 376 and the third coil 377 are energized, and the current direction of the coils is the first current direction. In this embodiment, the induced magnetic field generated by the second coil 376 and the third coil 377 has the same direction as the first direction in the magnetic circuit of the moving shaft 375. In this way, the induced magnetic field generated by the second coil 376 and the third coil 377 acts on the third force F3 in the moving shaft 375, a part of which is superimposed with the first force Fl, and another part of which is canceled with the second force F2 (as shown by the dashed arrow). In this way, the superimposed force is greater than the canceled force, which can make the moving shaft 375 slide in the first direction and remain abutting against the locking assembly, so as to make the locking assembly and the trip HE tripped and unlocked.

[0188] Fig. 48 is another energization schematic diagram of the second tripping device according to an embodiment of the present application. As shown in Fig. 48, when the second tripping device 37 receives the second drive signal, the second coil 376 and the third coil 377 are energized, and the current direction of the coils is the second current direction. The first current direction is opposite to the second current direction, so that the second coil 376 and the third coil 377 generate different induced magnetic fields after the circuit fault and the fault is solved, thereby driving the moving shaft 375 to move differently, and the second tripping device 37 can distinguish the second drive signal and the second reset signal by setting the current direction. In this embodiment, the induced magnetic fields generated by the second coil 376 and the third coil 377 have the same magnetic path direction in the moving shaft 375 as the second direction. In this way, the induced magnetic fields generated by the second coil 376 and the third coil 377 act on the third force F3 in the moving shaft 375, a part of which is superimposed with the second force F2, and another part of which is canceled with the first force F1 (as shown by the dashed arrow). In this way, the superimposed force is greater than the canceled force, so that the moving shaft 375 can slide along the second direction and be kept at the second position, so as to lock the locking operation mechanism 32. In this way, the second tripping device 37 keeps the locking operation state before the fault is removed, and the manual operation cannot be closed, thereby ensuring the safety of the circuit.

[0189] The magnetic path direction of the magnetic field generated by the second permanent magnet 378 in the second permanent magnet 378 is opposite to the magnetic path direction of the magnetic field generated by the third permanent magnet 379 in the third permanent magnet 379, which can specifically include that, in one embodiment, the magnetic pole of the end of the second permanent magnet 378 facing the third permanent magnet 379 is N pole, and the magnetic pole of the end of the third permanent magnet 379 facing the second permanent magnet 378 is N pole. In one embodiment, the magnetic pole of the end of the second permanent magnet 378 facing the third permanent magnet 379 is S pole, and the magnetic pole of the end of the third permanent magnet 379 facing the second permanent magnet 378 is S pole.

[0190] According to the above, it can be understood that the embodiments of Figs. 11 to 48 of the present application are similar to the structure principle of the DC switch of the embodiments shown in Figs. 4 to 9, and there are some differences in the structure of the transmission assembly, the structure of the reset component, the connection relationship between the transmission assembly and the reset component, and the connection relationship between the operating handle and the transmission assembly, but the operating handle, the tripping component, the reset component, the movable contact and the transmission assembly still have a transmission relationship, and the same effect can be achieved.

[0191] In the above embodiments, the moving part of the first / second driving device must be reset by the reset part, otherwise it cannot be automatically reset. In other embodiments, the moving part of the first / second driving device can be automatically reset, for example, a split-coil tripping device, as the magnetic force decreases over time, the moving part will slowly return to the initial position. Therefore, in this implementation scenario, in the case of internal failure of the inverter, the first driving signal sent by the controller to the first driving device is also used to lock the operating mechanism, that is, after the operating handle cannot control the operating mechanism to drive the moving contact to move, even if the first driving device is automatically reset for a period of time, the operating mechanism cannot close to make the moving contact and the static contact remain in a separated state, avoiding manual closing operation in the case of internal failure of the inverter.

[0192] Referring to FIG. 49, FIG. 49 is another structural schematic diagram of the inverter provided by the present application. As shown in FIG. 49, the DC switch S1 includes an operating handle, an operating mechanism, a moving contact, a static contact, and a first driving device, and the operating mechanism includes a trip part and a lock part. Here, the description of other circuits in the inverter 1 except the DC switch S1 and the connection relationship thereof is described with reference to the description of the corresponding part of the inverter 1 shown in FIG. 3, and will not be repeated here.

[0193] The main difference from the above embodiments is that in the embodiment shown in FIG. 49, the inverter only has one first driving device and does not include a second driving device, and the functions of the first driving device and the second driving device in the above embodiments are completed by controlling the first driving device by the controller 13.

[0194] In an implementation scenario, in the process of supplying power to the AC power grid by the inverter 1, in the case of internal failure of the inverter 1, the controller 13 sends a first driving signal to the first driving device. When the first driving device receives the first driving signal, the moving part in the first driving device is driven to drive the lock part and the trip part to be tripped, so that the moving contact and the static contact of the DC switch S1 are separated, that is, the DC switch S1 is opened. After the DC switch S1 is opened, the operating handle cannot drive the moving part in the first driving device to reset under the action of external force, so as to drive the lock part and the trip part to be engaged, and further drive the moving contact and the static contact of the DC switch S1 to be in contact. After that, in the case that the failure of the inverter 1 is eliminated, the controller 13 sends a third driving signal to the first driving device. When the first driving device receives the third driving signal, the moving part in the first driving device is reset. After the moving part in the first driving device is reset, the operating handle drives the lock part and the trip part to be engaged and drives the moving contact and the static contact of the DC switch S1 to be in contact under the action of external force.

[0195] For the convenience of understanding, the first driving device is taken as an example, and the principle diagram of the DC switch S1 shown in FIGS. 50 to 53 is combined to introduce by way of example. The DC switch S1 shown in FIGS. 50 to 53 does not include the link structure GJ, the link structure GE, the reset component EKF and the tripper TX2 compared with the DC switch S1 shown in FIGS. 4 to 9. Here, the description of the structure part of the DC switch S1 shown in FIGS. 50 to 53 is referred to the description of the corresponding part of the DC switch S1 shown in FIGS. 4 to 9, which will not be described here.

[0196] In the process that the inverter 1 supplies power to the AC power grid, the DC switch S1 is in the closed state, which corresponds to the switch state shown in FIG. 11. As shown in FIG. 11, the lock catch component M is buckled with the jump catch component DCH, the movable contact K1 and the stationary contact K2 are in the closed state, and the current position of the moving component d1 is x1. When the controller 13 determines that the inverter 1 fails based on that the electrical parameters of the inverter 1 exceed the first preset parameter range, the controller 13 sends the first driving signal to the tripper TX1. Then, as shown in FIG. 51, when the tripper TX1 receives the first driving signal, the tripper TX1 drives the moving component d1 to move from the position x1 to the position x2 (i.e., the position of the moving component d1 in FIG. 51), thereby driving the lock catch component M to rotate clockwise around the point Y, and the lock catch component M is buckled with the jump catch component DCH, so that the jump catch component DCH rotates counterclockwise. The point B moves to the right under the driving of the elastic potential energy stored in the elastic component GB, thereby driving the movable contact K1 to rotate clockwise quickly under the pulling of the link mechanism AB, and then the movable contact K1 and the stationary contact K2 are in the separated state, and the DC switch S1 is closed. Since the reset component of the moving component d1 of the tripper TX1 is not arranged in the operating mechanism of the DC switch S1, after the DC switch S1 is closed, even if the maintenance personnel manually push the operating handle Lf to rotate clockwise, the moving component d1 cannot be reset, and the moving component d1 will always be located at the position x2, so that the jump catch component DCH and the lock catch component M cannot be buckled by operating the operating handle of the DC switch S1, and then the DC switch S1 cannot be closed by operating the operating handle of the DC switch S1.

[0197] After the DC switch S1 is opened, a professional needs to maintain. After the maintenance, the controller 13 can detect the electrical parameters of the inverter 1, and if the electrical parameters of the inverter 1 are within the first preset parameter range, it means that the fault of the inverter 1 is eliminated, and the controller 13 sends a third driving signal to the tripping device TX1. When the tripping device TX1 receives the third driving signal, the driving part d1 moves from the position x2 to the position x1 to reset the driving part d1. The locking part M rotates counterclockwise due to the reset of the driving part d1 and stops at the position shown in FIG. 52. Since the driving part d1 has been reset, the maintenance personnel can rotate the operating handle Lf clockwise, and the locking part M is locked by the jumper DCH, that is, the locking part M is engaged with the jumper DCH, corresponding to the position shown in FIG. 53. Then, the maintenance personnel rotates the operating handle Lf counterclockwise, so that the elastic member GB has a pulling force on the left side of the connecting rod structure BC, and the B point moves left under the action of the elastic member GB. The connecting rod structure AB pushes the moving contact K1 downward to close, so that the moving contact K1 and the stationary contact K2 are in a closed state, corresponding to the switch state shown in FIG. 50, and the DC switch S1 is closed.

[0198] It can be understood that in the case of a fault of the inverter 1, the controller 13 controls the DC switch S1 to open by driving the driving part of the first driving device. Since the DC switch S1 does not have a reset part of the driving part of the first driving device, the maintenance personnel cannot close the DC switch S1 by operating the operating handle of the DC switch S1, thereby avoiding the situation that the DC switch S1 is manually closed when the inverter 1 fails, and further avoiding the spread of the fault. Only when the controller 13 detects that the fault of the inverter 1 is eliminated, the driving part of the first driving device is reset by the controller 13, and then the maintenance personnel can close the DC switch S1 by operating the operating handle of the DC switch S1. Further, it can be ensured that when the inverter 1 fails, the maintenance personnel cannot close the DC switch S1 by operating the operating handle of the DC switch S1 before the fault is eliminated, and the professional needs to be repaired. After the controller 13 in the inverter detects and confirms, the DC switch S1 can be further closed, thereby ensuring the safety of the maintenance personnel.

[0199] In another implementation scenario, in the process of inverter 1 supplying power to the AC power grid, in the case of failure of the photovoltaic string or its connecting line (external failure of the inverter), controller 13 sends a first driving signal to the first driving device. Upon receiving the first driving signal, the first driving device drives the moving part in the first driving device to drive the locking part and the jump part to be uncoupled, so as to separate the moving contact and the static contact of DC switch S1. After the failure of the photovoltaic string or its connecting line and after the moving contact and the static contact of DC switch S1 are separated, controller 13 immediately sends a third driving signal to the first driving device. Upon receiving the third driving signal, the first driving device drives the moving part in the first driving device to reset. After the moving part in the first driving device is reset, under the action of external force, the operating handle drives the jump part and the locking part to be coupled, and drives the moving contact and the static contact of DC switch S1 to be in contact.

[0200] That is, in this implementation scenario, the first driving device immediately sends the third driving signal after sending the first driving signal, without waiting for the failure of the photovoltaic string or its connecting line to be eliminated, so that the moving part of the first driving device is immediately reset to position x1 after reaching x2. Based on the debugging requirement, the maintenance personnel can manually push the operating handle Lf to rotate clockwise, the jump part DCH is pushed by the operating handle Lf to rotate clockwise, and the locking part M is coupled by the jump part DCH, that is, the locking part M and the jump part DCH are coupled. Then, the maintenance personnel pushes the operating handle Lf to rotate counterclockwise, so that the elastic member GB is pulled to the left side of the connecting rod structure BC, and the connecting rod structure AB pushes the moving contact K1 to close downward, so that the moving contact K1 and the static contact K2 are in a closed state, corresponding to the switch state shown in FIG. 50, and DC switch S1 is closed.

[0201] In other possible implementation manners, in order to ensure the safety of the maintenance personnel, in the case of failure of the photovoltaic string or its connecting line, controller 13 can also continue to detect the input electrical parameters of inverter 1, until it is detected that the input electrical parameters of inverter 1 are in the second preset parameter range, indicating that the failure of the photovoltaic string and its connecting line is eliminated, and then controller 13 sends a third driving signal to the first driving device to reset the moving part in the first driving device. Since the moving part in the first driving device is reset, DC switch S1 can be manually closed. That is, the maintenance personnel cannot directly manually close, and the moving part of the first driving device needs to be reset after the inverter detects that the failure of the photovoltaic string and its line is eliminated, so that the maintenance personnel can further manually close.

[0202] Optionally, after the DC switch S1 is tripped due to the fault of the photovoltaic string or the connection line thereof, the controller 13 sends a third driving signal to the first driving device and starts counting the number of times of closing between the moving contact and the static contact of the DC switch S1. Before the fault of the photovoltaic string or the connection line thereof is eliminated and the moving contact and the static contact are separated, if the number of times of the third driving signal sent to the first driving device does not exceed a preset threshold, the third driving signal is sent to the first driving device; when the fault of the photovoltaic string or the connection line thereof occurs, if the number of times of the second driving signal sent to the second driving device exceeds the preset threshold, the sending of the third driving signal to the first driving device is stopped. Since the controller 13 does not control the moving part in the first driving device to reset when the number of times of closing of the DC switch S1 exceeds the preset threshold in the case of the fault of the photovoltaic string or the connection line thereof, it can be ensured that the DC switch S1 cannot be manually closed again when the number of times of closing of the DC switch S1 exceeds the preset threshold. In this way, it can be ensured that a certain number of manual closing is allowed in the case of the fault of the photovoltaic string or the connection line thereof to meet the debugging requirements, and the fault is prevented from spreading due to the manual closing by the maintenance personnel without eliminating the fault.

[0203] In the embodiments of the present application, the first driving device for resetting the moving part of the DC switch S1 is controlled by the controller 13, the controller 13 trips the DC switch S1 by controlling the first driving device when the inverter 1 or the photovoltaic string or the connection line thereof fails, and the number of times of resetting the moving part in the first driving device is controlled to not exceed a preset threshold after the DC switch S1 is tripped due to the fault of the photovoltaic string or the connection line thereof, so that the DC switch S1 cannot be manually closed when the inverter 1 fails, and the DC switch S1 can be manually closed for a preset number of times when the photovoltaic string or the connection line thereof fails, thereby effectively preventing the fault from spreading. In addition, the number of driving devices in the DC switch S1 is small, which can effectively reduce the size and circuit cost of the DC switch S1, thereby effectively reducing the size and circuit cost of the inverter 1.

[0204] In the above embodiments shown in FIGS. 49-53, the first driving device can be implemented by a bistable tripper, i.e., without a reset component, and the switching of the first driving device between the two stable states can be controlled. The bistable tripper can be designed in a similar manner to the two specific implementation structures shown in FIGS. 39-48, and specific reference can be made to the above description, which will not be repeated here.

[0205] In addition, the determination of the two fault conditions of the inverter failure and the photovoltaic string or the connection line failure in the embodiments of the present application is similar to that of the above embodiments, which will not be repeated here.

[0206] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An inverter, characterized by comprising: The inverter comprises a direct current switch, a plurality of DC / DC converters, a direct current bus, a DC / AC converter and a controller, the direct current switch comprises an operating handle, an operating mechanism, a moving contact, a stationary contact, a first driving device and a second driving device, wherein: The input end of the plurality of DC / DC converters is used to connect photovoltaic strings through the direct current switch, the output end of the plurality of DC / DC converters is connected in parallel and the input end of the DC / AC converter is connected through the direct current bus, and the output end of the DC / AC converter is used to connect a load or an alternating current power grid; The operating mechanism comprises a locking component, a tripping component and a transmission assembly; the operating handle, the tripping component and the moving contact are respectively in transmission connection with the transmission assembly; The operating mechanism is used to drive the moving contact and the stationary contact to contact and separate, wherein, in the case that the tripping component is buckled with the locking component, the operating handle can drive the transmission assembly to drive the moving contact and the stationary contact to contact and separate; The controller is used to send a first driving signal to the first driving device in the case that the inverter fails; The first driving device is used to drive the moving component in the first driving device to move to drive the locking component and the tripping component to be tripped and make the transmission assembly drive the moving contact and the stationary contact to separate when the first driving signal is received; in the case that the tripping component is tripped with the locking component, the operating handle cannot drive the transmission assembly to drive the moving contact and the stationary contact to contact and separate; The controller is also used to send a second driving signal to the second driving device in the case that the photovoltaic strings or the connection line thereof fails; The second driving device is used to drive the moving component in the second driving device to move to drive the locking component and the tripping component to be tripped and make the transmission assembly drive the moving contact and the stationary contact to separate when the second driving signal is received; After the second driving device drives the moving contact and the stationary contact to separate, the operating handle is also used to drive the tripping component and the locking component to be buckled to make the operating handle able to drive the transmission assembly to drive the moving contact and the stationary contact to contact in the case that an external force is applied.

2. The inverter of claim 1, wherein, The operating mechanism further comprises a reset component, and the reset component is in transmission connection with the transmission assembly; After the second driving device drives the moving contact and the stationary contact to separate, the operating handle is specifically used to: drive the transmission assembly to drive the reset component to move in the case that an external force is applied, and the reset component is used to drive the moving component in the second driving device to reset; after the moving component in the second driving device is reset, the operating handle is also used to drive the tripping component and the locking component to be buckled to make the operating handle able to drive the transmission assembly to drive the moving contact and the stationary contact to contact in the case that an external force is applied.

3. The inverter according to claim 1 or 2, characterized by The first driving device is specifically configured to drive the moving part of the first driving device to drive the locking part to rotate from the first position to the second position according to the first driving signal, so that the locking part is uncoupled from the jump part, and the transmission assembly drives the moving contact to separate from the static contact. After the first driving device drives the moving contact to separate from the static contact, the operating handle cannot drive the moving part in the first driving device to reset, the locking part and the jump part remain in the uncoupled state, and the operating handle cannot drive the transmission assembly to drive the moving contact to contact the static contact.

4. The inverter of claim 1, wherein, The first driving signal is also used to drive the first driving device to lock the operating mechanism, so that the operating handle cannot control the locked operating mechanism to drive the moving contact to move, so that the moving contact and the static contact remain in the separated state.

5. The inverter of claim 2 or 3, wherein The operating mechanism further comprises a first mounting plate, a second mounting plate and an output shaft, wherein: The first mounting plate and the second mounting plate are arranged oppositely, the operating handle passes through the first mounting plate and the second mounting plate and rotates relative to the first mounting plate and the second mounting plate; the reset part is located between the first mounting plate and the second mounting plate and is rotationally connected with the first mounting plate and the second mounting plate; the reset part is transmissionally connected with the moving contact through the output shaft; The first mounting plate is provided with a first sliding groove, and the second mounting plate is provided with a second sliding groove; one end of the output shaft is accommodated in the first sliding groove, and the other end is accommodated in the second sliding groove; when the operating handle drives the reset part to rotate, the reset part drives the output shaft to slide in the first sliding groove and the second sliding groove, thereby driving the moving contact to move; The first driving device is configured to drive the moving part of the first driving device to extend into the reset part and the first mounting plate, or drive the second driving part to extend into the reset part and the second mounting plate according to the first driving signal, so that the reset part cannot rotate, thereby locking the movement of the operating mechanism, so that the operating handle cannot control the operating mechanism to drive the moving contact to move; or The first driving device is configured to drive the moving part of the first driving device to extend into the first sliding groove or the second sliding groove according to the first driving signal, so as to lock the sliding of the output shaft in the first sliding groove and the second sliding groove, so that the reset part cannot rotate, thereby locking the movement of the operating mechanism, so that the operating handle cannot control the operating mechanism to drive the moving contact to move.

6. The inverter according to any one of claims 1 to 5, characterized by The operating mechanism further comprises a housing, the locking part comprises a traction rod and a locking rod, the traction rod and the locking rod are respectively rotationally connected with the housing, and the traction rod is located on the side of the locking rod away from the jump part; the locking rod is used to be coupled with the jump part or separated from the jump part; When the locking component is in the first position, the first surface of the traction rod abuts against the locking rod and makes the locking rod engage with the jump-off component; when the locking component is in the second position, the second surface of the traction rod abuts against the locking rod and makes the locking rod disengage from the jump-off component; When the locking component rotates from the first position to the second position, the locking rod slides from the first surface to the second surface of the traction rod; when the locking component resets from the second position to the first position, the locking rod slides from the second surface to the first surface of the traction rod.

7. A switching device according to any one of claims 1 to 6, characterised in that The locking component is provided with a reset member; the reset member is used to drive the locking component to reset.

8. The inverter of claim 1, wherein the controller is specifically configured to, in the case where the photovoltaic string or the connection line thereof fails, send the second driving signal to the second driving device if the number of times of sending the second driving signal to the second driving device does not exceed a preset threshold value; and send the first driving signal to the first driving device in the case where the photovoltaic string or the connection line thereof fails if the number of times of sending the second driving signal to the second driving device exceeds the preset threshold value. The controller is further configured to, in the case where the inverter fails, send a third driving signal to the first driving device. The first driving device is further configured to, in the case where the third driving signal is received, drive the moving component in the first driving device to reset.

9. The inverter according to any one of claims 1 to 8, characterized by, After the moving component in the first driving device resets, the operating handle is further configured to, in the case where an external force is applied, drive the jump-off component to engage with the locking component, so that the operating handle can drive the transmission assembly to drive the moving contact to contact the stationary contact. The controller is further configured to determine that the inverter fails in the case where an electrical parameter of the inverter exceeds a first preset parameter range, wherein the electrical parameter of the inverter includes a bus voltage value or a bus current value of the direct-current bus. The controller is further configured to determine that the photovoltaic string or the connection line thereof fails in the case where an electrical parameter of the photovoltaic string exceeds a second preset parameter range, wherein the electrical parameter of the photovoltaic string includes an output voltage value, an output current value or a ground insulation impedance value.

10. The inverter of claim 1, wherein, The second driving device includes a first coil assembly, a first permanent magnet assembly and a first spring, the first spring is connected with a moving component of the second driving device; the first permanent magnet assembly generates a first magnetic field to exert a first acting force on the moving component of the second driving device; the first coil assembly is used to be electrified according to the second driving signal, so that the first coil assembly generates a first induced magnetic field to exert a second acting force on the moving component of the second driving device, and the second acting force and the first acting force are counteracted, so that the first spring drives the moving component of the second driving device to move towards the locking component.

11. The inverter of claim 1, wherein, ​ 12. The inverter of any one of claims 1 to 11, wherein, ​ 13. The inverter of any one of claims 1 to 12, wherein, The first driving device comprises a second coil assembly, a second permanent magnet assembly and a second spring, the second spring is connected with a moving part of the first driving device; the second permanent magnet assembly generates a second magnetic field to exert a third force on the moving part of the first driving device; the second coil assembly is used to be electrified according to the first driving signal, so that the second coil assembly generates a second induced magnetic field to exert a fourth force on the second driving part, and the fourth force counteracts the third force, thereby driving the second spring to move the moving part of the first driving device towards the lock part.

14. The inverter of claim 9, wherein, The first driving device comprises a third coil assembly and a third permanent magnet assembly; the third permanent magnet assembly generates a third magnetic field to exert a fifth force on the moving part of the first driving device; The third coil assembly is used to be electrified according to the first driving signal, so that the third coil assembly generates a third induced magnetic field to exert a sixth force on the moving part of the first driving device, and a part of the sixth force counteracts the fifth force, thereby driving the moving part of the first driving device to move towards the lock assembly under the action of another part of the sixth force, and driving the lock part to rotate from the first position to the second position; The third coil assembly is also used to be electrified according to a third driving signal, so that the third coil assembly generates a fourth induced magnetic field to exert a seventh force on the moving part of the first driving device, and a part of the seventh force counteracts the fifth force, thereby driving the moving part of the first driving device to reset under the action of another part of the seventh force.

15. An inverter, characterized by The inverter comprises a DC switch, a plurality of DC / DC converters, a DC bus, a DC / AC converter and a controller, the DC switch comprises an operating handle, an operating mechanism, a moving contact, a stationary contact and a first driving device, wherein: The input end of the plurality of DC / DC converters is used to connect a photovoltaic string through the DC switch, the output end of the plurality of DC / DC converters is connected in parallel and connects the input end of the DC / AC converter through the DC bus, and the output end of the DC / AC converter is used to connect a load or an AC power grid; The operating mechanism comprises a lock part, a jump part, a transmission assembly; the operating handle, the jump part and the moving contact are respectively in transmission connection with the transmission assembly; The operating mechanism is used to drive the moving contact and the stationary contact to contact and separate, wherein, in the case that the jump part is buckled with the lock part, the operating handle can drive the transmission assembly to drive the moving contact and the stationary contact to contact and separate; The controller is used to send a first driving signal to the first driving device in the case that the inverter, the photovoltaic string or the connection line of the photovoltaic string fails. The first driving device is configured to drive a moving component in the first driving device to move when the first driving signal is received, so as to drive the locking component to be uncoupled from the jump ring component, and drive the transmission assembly to separate the movable contact from the stationary contact; when the jump ring component is uncoupled from the locking component, the operating handle cannot drive the transmission assembly to drive the movable contact to contact or separate from the stationary contact. The controller is further configured to send a third driving signal to the first driving device in the case of inverter troubleshooting, and send the third driving signal to the first driving device before the photovoltaic string or its connection line is troubleshooted and the movable contact is separated from the stationary contact. The first driving device is further configured to drive the moving component in the first driving device to reset when the third driving signal is received. After the moving component in the first driving device is reset, the operating handle is further configured to drive the jump ring component to be coupled with the locking component under the action of an external force, so as to enable the operating handle to drive the transmission assembly to drive the movable contact to contact the stationary contact.

16. The inverter of claim 15, wherein The controller is specifically configured to send the third driving signal to the first driving device if the number of the third driving signals sent to the first driving device does not exceed a preset threshold before the photovoltaic string or its connection line is troubleshooted and the movable contact is separated from the stationary contact. The controller is further configured to stop sending the third driving signal to the first driving device when the number of the third driving signals sent to the second driving device exceeds a preset threshold in the case that the photovoltaic string or its connection line fails.

17. The inverter of claim 15 or 16, wherein, The controller is further configured to determine that the inverter fails when an electrical parameter of the inverter exceeds a first preset parameter range, wherein the electrical parameter of the inverter includes a bus voltage value or a bus current value of the direct current bus.

18. The inverter of any of claims 15-17, wherein, The controller is further configured to determine that the photovoltaic string or its connection line fails when an electrical parameter of the photovoltaic string exceeds a second preset parameter range, wherein the electrical parameter of the photovoltaic string includes an output voltage value, an output current value or a ground insulation impedance value.

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