Inverter detection device

Abstract

The utility model provides an inverter detection device, which relates to the technical field of inverters and comprises a first rectifier, a second rectifier, a first switch, a first short circuit device, a first station plate, a second switch, a second short circuit device, a second station plate and a common terminal. Two station plates are arranged, and the two station plates are provided with rectifiers, switches and short circuit devices, so that each station plate firstly has partial direct current input, then the output end of one rectifier is connected with the input end of the corresponding station plate, and the output end of the other rectifier is connected with a common terminal; by changing the on-off state of the switch and the plugging position of the common terminal, the two station plates can be plugged with the same inverter at the same time for detection, or can be plugged with different inverters with more input requirements for detection, so that the inverter detection device can detect various types of inverters, the compatibility is improved, and the detection efficiency is improved. And the vacancy rate of the detection device is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of inverters, and in particular to an inverter detection device. Background Art

[0002] The inverter is an important component in the power generation system, which is used to convert direct current into alternating current for users. Because of the importance of the inverter, the inverter test is essential.

[0003] The existing inverter detection device can only detect a certain series of inverters, but the series of inverters will gradually change. When detecting inverters of other series, the detection device will be idle. As the number of inverter series increases, the idle rate of the detection device will increase, and its compatibility is poor, resulting in a waste of equipment space and resources. Utility Model Content

[0004] The problem to be solved by the utility model is that the existing inverter detection device has low compatibility and high idle rate.

[0005] In order to solve the above problems, the utility model provides an inverter detection device, including a first rectifier, a second rectifier, a first switch, a first short-circuit device, a first workstation board, a second switch, a second short-circuit device, a second workstation board and a common terminal;

[0006] The output end of the first rectifier is connected to the input end of the first switch, the output end of the first switch is connected to the input end of the first short-circuit device, the output end of the first short-circuit device is connected to the first workstation board, and the output end of the first rectifier is also connected to the first workstation board;

[0007] The output end of the second rectifier is connected to the input end of the second switch, the output end of the second switch is connected to the second short-circuit device, the output end of the second short-circuit device is connected to the second workstation board, and the output end of the second rectifier is also connected to the common terminal, which is used to connect to the first workstation board or the second workstation board.

[0008] Optionally, the inverter detection device also includes a power cabinet and a soft start cabinet, the output end of the power cabinet is connected to the input end of the soft start cabinet, and the output end of the soft start cabinet is respectively connected to the input end of the first rectifier and the input end of the second rectifier.

[0009] Optionally, the inverter detection device also includes a seventh current sensor, an eighth current sensor and a ninth current sensor, the eighth current sensor is arranged on the DC wire between the first rectifier and the first workstation plate, the ninth current sensor is arranged on the DC wire between the second rectifier and the common terminal, the DC wire between the first rectifier and the first workstation plate and the DC wire between the second rectifier and the common terminal constitute a DC wire harness, and the seventh current sensor is arranged on the DC wire harness.

[0010] Optionally, the inverter detection device also includes a first wiring terminal, a grid-connected cabinet and an output current sensor, the output end of the first workstation board is respectively connected to one end of the three first wiring terminals, the other ends of the three first wiring terminals are respectively connected to one end of the three output current sensors, and the other ends of the three output current sensors are connected to the input end of the grid-connected cabinet.

[0011] Optionally, the inverter detection device also includes a switching relay assembly and a transformer, the output end of the grid-connected cabinet is connected to one end of the switching relay assembly, the other end of the switching relay assembly is connected to the input end of the transformer, and the output end of the transformer is connected to the input end of the first rectifier.

[0012] The switching relay assembly includes a first switching relay and a second switching relay. The output end of the power-connected cabinet is connected to one end of the first switching relay, and the other end of the first switching relay is connected to the first winding input end in the transformer. The output end of the power-connected cabinet is connected to one end of the second switching relay, and the other end of the second switching relay is connected to the second winding input end in the transformer.

[0013] Optionally, the inverter detection device also includes a contactor group and second wiring terminals, the output end of the second workstation board is respectively connected to one end of three second wiring terminals, the other ends of the three second wiring terminals are respectively connected to three pins of the input end of the contactor group, the three pins of the output end of the contactor group are respectively connected to one end of three output current sensors, and the other ends of the three output current sensors are connected to the input end of the second rectifier.

[0014] Optionally, the inverter detection device also includes a power analyzer, a second contactor and a fourth contactor, the three AC voltage collection terminals of the power analyzer are respectively connected to the three pins at one end of the second contactor and the three pins at one end of the fourth contactor, the three pins at the other end of the second contactor are respectively connected to the three first wiring terminals, and the three pins at the other end of the fourth contactor are respectively connected to the three second wiring terminals.

[0015] Optionally, the inverter detection device also includes a first contactor and a third contactor, the two DC voltage collection ends of the power analyzer are respectively connected to the two pins at one end of the first contactor and the two pins at one end of the third contactor, the two pins at the other end of the first contactor are respectively connected to the cathode and anode of the DC input end on the first workstation board, and the two pins at the other end of the third contactor are respectively connected to the cathode and anode of the DC input end on the second workstation board.

[0016] Optionally, the inverter detection device further includes a first relay, a third relay and a second relay, and the three AC current collection terminals and one DC current collection terminal of the power analyzer are respectively connected to four pins at one end of the first relay and four pins at one end of the second relay;

[0017] The three pins at the other end of the first relay corresponding to the three AC current collection ends are respectively connected to the three output current sensors on the three lines of the output end of the first workstation board, the pin at the other end of the first relay corresponding to the DC current collection end is connected to the moving contact piece of the third relay, the normally closed contact of the third relay is connected to the seventh current sensor, and the normally open contact of the third relay is connected to the eighth current sensor;

[0018] The three pins at the other end of the second relay corresponding to the three AC current collection ends are respectively connected to the three output current sensors on the three lines of the output end of the second workstation board, and the pin at the other end of the first relay corresponding to the DC current collection end is connected to the ninth current sensor.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The utility model provides an inverter detection device, which sets two workstation boards and equips the two workstation boards with rectifiers, switches and short-circuit devices, so that each workstation board first has a partial DC input, and then connects the output end of a rectifier to the input end of its corresponding workstation board, and connects the output end of the other rectifier to a common terminal, and by changing the on-off state of the switch and the plug-in position of the common terminal, the two workstation boards can be plugged in the same inverter for detection at the same time, or different inverters with more input requirements can be plugged in for detection, so that the inverter detection device can detect multiple types of inverters, improve compatibility, and reduce the idle rate of the detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A circuit diagram of an inverter detection device in an embodiment of the utility model is shown;

[0022] Figure 2 The figure shows a wiring diagram of a power analyzer in an embodiment of the utility model.

[0023] Description of reference numerals:

[0024] 1. Power cabinet; 2. Soft start cabinet; 3. Transformer; 4. First switching relay; 5. Second switching relay; 6. Grid cabinet; 7. First rectifier; 8. Second rectifier; 9. First switch; 10. First short-circuit device; 11. First workstation board; 12. Second switch; 13. Second short-circuit device; 14. Second workstation board; 15. First current sensor; 16. Second current sensor; 17. Third current sensor; 18. Fourth current sensor; 19. Fifth current sensor; 20. Sixth current sensor; 21. Seventh current sensor; 22. Eighth current sensor; 23. Ninth current sensor; 24. Common terminal; 25. Power analyzer; 26. First relay; 27. Third relay; 28. First contactor; 29. ​​Second contactor; 30. Second relay; 31. Third contactor; 32. Fourth contactor; 33. First wiring terminal; 34. Second wiring terminal. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here.

[0027] In the description of this specification, the description with reference to the terms "embodiment", "one embodiment" and "one implementation" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or implementation are included in at least one embodiment or implementation of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or implementation. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or implementations in a suitable manner.

[0028] Figure 1The circuit diagram of an inverter detection device in an embodiment of the utility model is shown, and the inverter detection device includes a first rectifier 7, a second rectifier 8, a first switch 9, a first short-circuit device 10, a first station board 11, a second switch 12, a second short-circuit device 13, a second station board 14 and a common terminal 24;

[0029] The output end of the first rectifier 7 is connected to the input end of the first switch 9, the output end of the first switch 9 is connected to the input end of the first short-circuit device 10, the output end of the first short-circuit device 10 is connected to the first workstation board 11, and the output end of the first rectifier 7 is also connected to the first workstation board 11.

[0030] The output end of the second rectifier 8 is connected to the input end of the second switch 12, the output end of the second switch 12 is connected to the second short-circuit device 13, the output end of the second short-circuit device 13 is connected to the second work station board 14, and the output end of the second rectifier 8 is also connected to the common terminal 24, and the common terminal 24 is used to be connected to the first work station board 11 or the second work station board 14.

[0031] Specifically, the first short-circuit device 10 and the second short-circuit device 13 can be selected from other short-circuit devices such as short-circuit bars, short-circuit wires, short-circuit springs or short-circuit connectors. In another exemplary embodiment, the input end of the selected first inverter is a twelve-way DC input, and the input end of the second inverter is a sixteen-way DC input, and the inputs of the two inverters are different. The first station board 11 is used to install the first inverter and the second inverter; the second station board 14 is used to install the first inverter. In addition, if it is assumed that a is the number of lines connecting the output end of the first short-circuit device 10 to the first workstation board 11, in this embodiment a=4; b is the number of lines connecting the output end of the first rectifier 7 to the first workstation board 11, in this embodiment b=8; c is the number of lines connecting the output end of the second short-circuit device 13 to the second workstation board 14, in this embodiment c=4; d is the number of lines connecting the output end of the second rectifier 8 to the common terminal 24, in this embodiment d=8; at this time, the first workstation board can have a variety of input lines, namely a+b, b+d and a+b+d; the number of input lines of the first workstation board is c+d, so in addition to the first inverter and the second inverter with two different input requirements exemplified above, a third inverter can also be installed on the first workstation board, and the number of input lines of the third inverter is a+b+d.

[0032] In this embodiment, the first inverter or the second inverter to be detected is plugged into the first workstation board 11, or the first inverter is plugged into the second workstation board 14, wherein the number of input terminals of the first workstation board 11 and the second workstation board 14 is different, and the first workstation board 11 may have more input terminals than the second workstation board 14, so that various types of inverters can be installed on the first workstation board 11. The power supply supplies power to the first rectifier 7 and the second rectifier 8. If the first rectifier 7 and the second rectifier 8 both output eight-way direct current, the eight-way direct current output by the first rectifier 7 passes through the first switch 9 and the first short-circuit device 10, and the short-circuit device is used to short-circuit multiple power terminals or signal terminals together, thereby reducing the number of output lines. The first short-circuit device 10 outputs four-way direct current connected to the first workstation board 11, and the eight-way direct current output from the output end of the first rectifier 7 is also directly connected to the first workstation board 11 to supply power to the first workstation board 11.

[0033] After passing through the second switch 12 and the second short-circuit device 13, the output end of the second rectifier 8 is directly connected to the second workstation board 14, which is used to supply power to the second workstation board 14. At the same time, the eight-way DC power at the output end of the second rectifier 8 is also connected to the common terminal 24, which can be plugged into the input end of the first workstation board 11 or the input end of the second workstation board 14. When the first inverter needs to be tested, the common terminal 24 is connected to the input end of the second workstation board 14, and the first switch 9 and the second switch 12 are both closed. Both workstation boards have twelve DC inputs, and the first inverter can be plugged into the first workstation board 11 and the second workstation board 14. At this time, the two first inverters can be tested at the same time; when the second inverter needs to be tested, the common terminal 24 is connected to the input end of the first workstation board 11, and the first switch 9 and the second switch 12 are both disconnected. At this time, the first workstation board 11 has sixteen DC inputs, which can test the second inverter.

[0034] In this embodiment, two workstation boards are set up and equipped with rectifiers, switches and short-circuiting devices, so that each workstation board first has a partial DC input, and then the output end of a rectifier is connected to its corresponding workstation board input end, and the output end of the other rectifier is connected to the common terminal 24. By changing the open and closed state of the switch and the plug-in position of the common terminal 24, the two workstation boards can be plugged into the same inverter for detection at the same time, or different inverters with more input requirements can be plugged in for detection, so that the inverter detection device can detect multiple types of inverters, improve compatibility, and reduce the idle rate of the detection device.

[0035] In one embodiment of the present invention, Figure 1The inverter detection device also includes a power cabinet 1 and a soft start cabinet 2, the output end of the power cabinet 1 is connected to the input end of the soft start cabinet 2, and the output end of the soft start cabinet 2 is respectively connected to the input end of the first rectifier 7 and the input end of the second rectifier 8.

[0036] Specifically, the AC power is introduced through the power cabinet 1, and the power supply is controlled through the soft start cabinet 2. The soft start cabinet 2 is used for voltage reduction starting to reduce the impact of the AC power on the rectifier and transformer. When the detection device is running, the AC power is supplemented to the detection device through the soft start cabinet 2. The soft start cabinet 2 outputs 400V AC power to continuously power the detection device.

[0037] In one embodiment of the present invention, Figure 1 The inverter detection device also includes a seventh current sensor 21, an eighth current sensor 22 and a ninth current sensor 23. The eighth current sensor 22 is arranged on the DC wire between the first rectifier 7 and the first workstation board 11, and is used to detect the input current value of the first rectifier 7 to the first workstation board 11 through the eight DC wires. The ninth current sensor 23 is arranged on the DC wire between the second rectifier 8 and the common terminal 24, and is used to detect the input current value of the second rectifier 8 to the common terminal 24 through the eight DC wires. The DC wire between the first rectifier 7 and the first workstation board 11 and the DC wire between the second rectifier 8 and the common terminal 24 constitute a DC wire harness. The seventh current sensor 21 is arranged on the DC wire harness to detect the current value passing through the DC wire harness, which is equivalent to simultaneously detecting the output current values ​​of the first rectifier 7 and the second rectifier 8.

[0038] Specifically, by installing current sensors on the output circuit of the first rectifier 7 and the output circuit of the second rectifier 8, it is very convenient to collect part of the output current of the rectifier (i.e., the input current of the workstation board or the inverter to be tested), and it is only necessary to connect the collection device to the current sensor. Since the output circuit of the second rectifier 8 is connected to the common terminal 24, there are two connection states, and the current magnitudes thereon are different in the two states.

[0039] In order to reduce the number of collection times and distinguish the two connection states of the output line of the second rectifier 8, the eighth current sensor 22 and the ninth current sensor 23 are respectively installed on the output lines of the first rectifier 7 and the second rectifier 8. When detecting the two first inverters, the currents on the eighth current sensor 22 and the ninth current sensor 23 are respectively collected, and part of the input DC current values ​​of the two first inverters can be collected respectively. When the two first inverters are normal, the two collected input DC current values ​​are within the normal range. When the two first inverters are abnormal, the two collected input DC current values ​​exceed the normal range, so that the tooling status of the two first inverters can be detected; a seventh current sensor 21 is jointly set on the output lines of the first rectifier 7 and the second rectifier 8. When the second inverter needs to be detected, the common terminal 24 is plugged into the input end of the first workstation board 11. At this time, the first rectifier 7 and the second rectifier 8 simultaneously power the second inverter. The current on the seventh current sensor 21 can obtain the input DC current value of the second inverter, and then the working state of the second inverter is detected. The seventh current sensor 21, the eighth current sensor 22 and the ninth current sensor 23 may be LT508-S6 current sensors. Multiple current sensors are provided at the input end of the inverter as required, so that the input current value can be easily collected for detection.

[0040] In one embodiment of the present invention, Figure 1 The inverter detection device also includes a first wiring terminal 33, a power-connected cabinet 6 and an output current sensor. The three lines at the output end of the first workstation board 11 are respectively connected to one end of the three first wiring terminals 33, and the other ends of the three first wiring terminals 33 are respectively connected to one end of the three output current sensors, and the other ends of the three output current sensors are connected to the input end of the power-connected cabinet 6.

[0041] Specifically, a first terminal 33 and an output current sensor are installed on each of the three lines output by the first workstation board 11, wherein the output current sensors on the three lines are respectively the first current sensor 15, the second current sensor 16 and the third current sensor 17, and the model of the output current sensor can be the LT308-S6 current sensor. When it is necessary to collect the alternating current output by the first workstation board, the collection device can be directly connected to the three output current sensors. If it is necessary to collect the output voltage of the first workstation board 11, the collection end of the collection device is connected to the three first terminals 33, and the AC voltage on the three output lines can be collected. In addition, the grid cabinet 6 is used to control the on and off of the output line, and the output line is connected to the input end of the first rectifier 7 to form a closed loop.

[0042] In one embodiment of the present invention, Figure 1 The inverter detection device also includes a switching relay assembly and a transformer 3. The output end of the power-connected cabinet 6 is connected to one end of the switching relay assembly, the other end of the switching relay assembly is connected to the input end of the transformer 3, and the output end of the transformer 3 is connected to the input end of the first rectifier 7.

[0043] Specifically, the transformer transforms the AC power inverted by the inverter to be tested, and then connects it to the first rectifier 7, which can provide a variety of input voltages for the first rectifier 7, so that the input voltage has diversity to meet the detection requirements of different inverters.

[0044] In this embodiment, if Figure 1 The switching relay assembly includes a first switching relay 4 and a second switching relay 5. The output end of the power-connected cabinet 6 is connected to one end of the first switching relay 4, and the other end of the first switching relay 4 is connected to the first winding input end in the transformer 3. The output end of the power-connected cabinet 6 is connected to one end of the second switching relay 5, and the other end of the second switching relay 5 is connected to the second winding input end in the transformer 3.

[0045] Specifically, the winding of the transformer connected to the circuit is changed by controlling the on and off of the first switching relay 4 and the second switching relay 5, so that the transformer can output two different voltages. For example, the output end of the transformer 3 can adjust the secondary winding of the connected circuit by controlling the switching circuit breaker component to output 400VAC or 800VAC.

[0046] In one embodiment of the present invention, Figure 1 The inverter detection device also includes a contactor group and a second terminal 34. The three lines at the output end of the second workstation board 14 are respectively connected to one end of the three second terminal 34, and the other ends of the three second terminal 34 are respectively connected to the three pins at the input end of the contactor group. The three pins at the output end of the contactor group are respectively connected to one end of the three output current sensors, and the other ends of the three output current sensors are connected to the input end of the second rectifier 8.

[0047] Specifically, an output current sensor and a second wiring terminal 34 are also respectively provided on the three output lines of the second work station board 14, wherein the three output current sensors are the fourth current sensor 18, the fifth current sensor 19 and the sixth current sensor 20. When it is necessary to collect the output current of the inverter to be tested on the second work station board 14, the AC current sampling end of the collection device is connected to the output current sensor. When it is necessary to collect and detect the output voltage, the AC voltage sampling end of the collection device is connected to the three second wiring terminals 34, so as to realize the rapid sampling of the output current and output voltage on the output end of the second work station board 14, such as Figure 1 , the contactor group can be as follows Figure 1 Two contactors are arranged between the sixth current sensor 20 and the second terminal 34. The purpose of setting two contactors is to prevent one of the contactors from short-circuiting or failing. If only one contactor is arranged, when the contactor short-circuits, the output circuit of the second workstation plate 14 cannot be disconnected.

[0048] In one embodiment of the present invention, Figure 1 and Figure 2 The inverter detection device also includes a power analyzer 25, a second contactor 29 and a fourth contactor 32. The three AC voltage collection ends of the power analyzer 25 are respectively connected to the three pins at one end of the second contactor 29 and the three pins at one end of the fourth contactor 32. The three pins at the other end of the second contactor 29 are respectively connected to the three first wiring terminals 33, and the three pins at the other end of the fourth contactor 32 are respectively connected to the three second wiring terminals 34.

[0049] Specifically, in order to realize fast and efficient sampling of the current and voltage at the input and output ends of the inverter to be tested in the detection device, a power analyzer 25 is added, which can measure multiple power parameters such as voltage, current, power factor, and electric energy. It can detect and evaluate the working status of various power equipment and provide detailed data analysis. When the inverter to be tested plugged into the first workstation board 11 and the second workstation board 14 is the first inverter, when you want to collect two output voltages at the same time, you only need to close the second contactor 29 and the fourth contactor 32. When only the second inverter is plugged into the first workstation board 11 for detection, when collecting voltage, you only need to close the second contactor 29 and open the fourth contactor 32, and the collected output voltages are all AC voltages.

[0050] In one embodiment of the present invention, Figure 1 and Figure 2The inverter detection device also includes a first contactor 28 and a third contactor 31. The two DC voltage collection ends of the power analyzer 25 are respectively connected to the two pins at one end of the first contactor 28 and the two pins at one end of the third contactor 31. The two pins at the other end of the first contactor 28 are respectively connected to the cathode and anode of the DC input end on the first workstation board 11, and the two pins at the other end of the third contactor 31 are respectively connected to the cathode and anode of the DC input end on the second workstation board 14.

[0051] Specifically, when collecting the input voltage of the first inverter plugged into the first station board 11 and the second station board 14, it is only necessary to close the first contactor 28 and the third contactor 31. When only the second inverter is plugged into the first station board 11 for detection, when collecting the input voltage of the second inverter, it is only necessary to close the first contactor 28 and open the third contactor 31. The collected input voltages are all DC voltages.

[0052] In one embodiment of the present invention, Figure 1 and Figure 2 , the inverter detection device also includes a first relay 26, a third relay 27 and a second relay 30, and the three AC current collection terminals and one DC current collection terminal of the power analyzer 25 are respectively connected to the four pins at one end of the first relay 26 and the four pins at one end of the second relay 30;

[0053] The three pins at the other end of the first relay 26 corresponding to the three AC current collection ends are respectively connected to the three output current sensors on the three lines of the output end of the first workstation board 11, and the pins at the other end of the first relay 26 corresponding to the DC current collection end are connected to the moving contact piece of the third relay 27, the normally closed contact of the third relay 27 is connected to the seventh current sensor 21, and the normally open contact of the third relay 27 is connected to the eighth current sensor 22;

[0054] The three pins at the other end of the second relay 30 corresponding to the three AC current collection ends are respectively connected to the three output current sensors on the three lines of the output end of the second workstation board 14, and the pin at the other end of the first relay 26 corresponding to the DC current collection end is connected to the ninth current sensor 23.

[0055] Specifically, when the first inverter is plugged into the first workstation board 11 or the second workstation board 14 and the input current and output current of the first inverter are collected, the first relay 26 or the second relay 30 needs to be closed. When the first relay 26 is closed, the third relay 27 maintains a normally open state. At this time, the third relay 27 is connected to the eighth current sensor 22, and the input current of the first inverter plugged into the first workstation board 11 is collected, and the input current is a direct current. The other three pins of the first relay 26 collect the output current of the first inverter plugged into the first workstation board 11, and the output current is an alternating current. When the second relay 30 is closed, the input current and output current of the first inverter plugged into the second workstation board 14 are collected at this time, and the pin for collecting the input current of the first inverter on the second workstation board 14 is connected to the ninth current sensor 23. When only the second inverter is plugged into the first workstation board 11 for testing, the first relay 26 and the third relay 27 are closed. At this time, the third relay 27 connects the seventh current sensor 21 to the DC current collection end of the power analyzer 25 to collect the input current and output current of the second inverter.

[0056] In addition, in the present invention, the opening and closing of all relays and contactors can be logically loaded by the upper computer software to the controller, thereby realizing fully automatic sampling of power quality parameters, and realizing a power analyzer 25 to sample and analyze the power quality of multiple inverters at the same time. The sampling can be intermittent or continuous, and it can also switch between multiple stations to collect power parameters of different inverters.

[0057] Although the utility model is disclosed as above, the utility model is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the scope defined by the claims.

Claims

1. An inverter detection device, characterized in that: It comprises a first rectifier (7), a second rectifier (8), a first switch (9), a first short-circuit device (10), a first work station plate (11), a second switch (12), a second short-circuit device (13), a second work station plate (14) and a common terminal (24); The output end of the first rectifier (7) is connected to the input end of the first switch (9), the output end of the first switch (9) is connected to the input end of the first short-circuit device (10), the output end of the first short-circuit device (10) is connected to the first workstation board (11), and the output end of the first rectifier (7) is also connected to the first workstation board (11); The output end of the second rectifier (8) is connected to the input end of the second switch (12), the output end of the second switch (12) is connected to the second short-circuit device (13), the output end of the second short-circuit device (13) is connected to the second work station board (14), and the output end of the second rectifier (8) is also connected to the common terminal (24), and the common terminal (24) is used to be connected to the first work station board (11) or the second work station board (14).

2. The inverter detection device according to claim 1, characterized in that: It also includes a power cabinet (1) and a soft start cabinet (2), wherein the output end of the power cabinet (1) is connected to the input end of the soft start cabinet (2), and the output end of the soft start cabinet (2) is respectively connected to the input end of the first rectifier (7) and the input end of the second rectifier (8).

3. The inverter detection device according to claim 1, characterized in that: It also includes a seventh current sensor (21), an eighth current sensor (22) and a ninth current sensor (23), wherein the eighth current sensor (22) is arranged on the DC wire between the first rectifier (7) and the first workstation plate (11), and the ninth current sensor (23) is arranged on the DC wire between the second rectifier (8) and the common terminal (24). The DC wire between the first rectifier (7) and the first workstation plate (11) and the DC wire between the second rectifier (8) and the common terminal (24) constitute a DC wire harness, and the seventh current sensor (21) is arranged on the DC wire harness.

4. The inverter detection device according to claim 3, characterized in that: It also comprises a first wiring terminal (33), a grid-connected cabinet (6) and an output current sensor, wherein the output end of the first workstation board (11) is respectively connected to one end of three of the first wiring terminals (33), the other ends of the three first wiring terminals (33) are respectively connected to one end of three of the output current sensors, and the other ends of the three output current sensors are connected to the input end of the grid-connected cabinet (6).

5. The inverter detection device according to claim 4, characterized in that: It also includes a switching relay component and a transformer (3), wherein the output end of the grid-connected cabinet (6) is connected to one end of the switching relay component, the other end of the switching relay component is connected to the input end of the transformer (3), and the output end of the transformer (3) is connected to the input end of the first rectifier (7).

6. The inverter detection device according to claim 5, characterized in that: The switching relay assembly comprises a first switching relay (4) and a second switching relay (5); the output end of the power-connected cabinet (6) is connected to one end of the first switching relay (4), the other end of the first switching relay (4) is connected to the input end of the first winding in the transformer (3), the output end of the power-connected cabinet (6) is connected to one end of the second switching relay (5), and the other end of the second switching relay (5) is connected to the input end of the second winding in the transformer (3).

7. The inverter detection device according to claim 4, characterized in that: It also includes a contactor group and a second wiring terminal (34), wherein the output end of the second workstation board (14) is respectively connected to one end of three second wiring terminals (34), the other ends of the three second wiring terminals (34) are respectively connected to three pins of the input end of the contactor group, the three pins of the output end of the contactor group are respectively connected to one end of three output current sensors, and the other ends of the three output current sensors are connected to the input end of the second rectifier (8).

8. The inverter detection device according to claim 7, characterized in that: It also includes a power analyzer (25), a second contactor (29) and a fourth contactor (32), wherein the three AC voltage collection terminals of the power analyzer (25) are respectively connected to the three pins at one end of the second contactor (29) and the three pins at one end of the fourth contactor (32), the three pins at the other end of the second contactor (29) are respectively connected to the three first wiring terminals (33), and the three pins at the other end of the fourth contactor (32) are respectively connected to the three second wiring terminals (34).

9. The inverter detection device according to claim 8, characterized in that: It also includes a first contactor (28) and a third contactor (31), wherein the two DC voltage collection terminals of the power analyzer (25) are respectively connected to the two pins at one end of the first contactor (28) and the two pins at one end of the third contactor (31), the two pins at the other end of the first contactor (28) are respectively connected to the cathode and anode of the DC input terminal on the first work station board (11), and the two pins at the other end of the third contactor (31) are respectively connected to the cathode and anode of the DC input terminal on the second work station board (14).

10. The inverter detection device according to claim 8, characterized in that: It also includes a first relay (26), a third relay (27) and a second relay (30), wherein three AC current collection terminals and one DC current collection terminal of the power analyzer (25) are respectively connected to four pins at one end of the first relay (26) and four pins at one end of the second relay (30); The three pins at the other end of the first relay (26) corresponding to the three AC current collection ends are respectively connected to the three output current sensors on the three lines of the output end of the first workstation board (11); the pins at the other end of the first relay (26) corresponding to the DC current collection end are connected to the moving contact piece of the third relay (27); the normally closed contact of the third relay (27) is connected to the seventh current sensor (21); and the normally open contact of the third relay (27) is connected to the eighth current sensor (22); The three pins at the other end of the second relay (30) corresponding to the three AC current collection ends are respectively connected to the three output current sensors on the three lines of the output end of the second workstation board (14), and the pin at the other end of the first relay (26) corresponding to the DC current collection end is connected to the ninth current sensor (23).

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