Power output switching device and system

Abstract

The embodiment of the utility model relates to the electrical field, and discloses a power output switching device and system. The power supply output switching device comprises two three-phase input ends, two three-phase output ends, two single-phase output ends and a switching matrix, the two three-phase input ends are respectively connected with a three-phase power supply; the switching matrix is used for controlling the conduction state of each phase line level circuit between each three-phase input end and the two three-phase output ends and between each three-phase input end and the two single-phase output ends. Therefore, the three-phase power supply directly outputs three-phase power through the three-phase output end, or the three-phase power supply is adjusted to be a single-phase power supply and then single-phase power is output through the single-phase output end. According to the scheme, different line topologies are formed by controlling the conduction of each phase line level line in the switching matrix, different output modes can be realized, the workload of manual wiring is greatly reduced, the test efficiency is improved, the structure is simple, the implementation is easy, and the cost is saved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communications, and in particular to a power output switching device and system. Background Art

[0002] As the demand for power in life increases, in practical applications, two sets of three-phase power supplies of the same model may be connected in parallel to achieve greater output power and more output modes. However, different output modes have different wiring methods. In the process of connecting two sets of three-phase power supplies in parallel, in order to achieve different output modes, the wiring method needs to be changed frequently, which greatly reduces reliability, safety, and test efficiency. Utility Model Content

[0003] The purpose of the embodiments of the present application is to provide a power supply output switching device and system, which can set a switching matrix between two three-phase input terminals and multiple output terminals through hardware circuit design, and form different line topologies and realize different output modes only by controlling the conduction of each phase line level line in the switching matrix, thereby greatly reducing the workload of manual wiring, reducing the risk of equipment damage and personal injury due to operational errors, and improving test efficiency. It also has a simple structure, is easy to implement, and saves costs.

[0004] To solve the above technical problems, an embodiment of the present application provides a power output switching device, comprising: two three-phase input terminals, two three-phase output terminals, two single-phase output terminals and a switching matrix; the two three-phase input terminals are respectively connected to a three-phase power supply;

[0005] The switching matrix is ​​used to control the conduction state of each phase line between each of the three-phase input terminals and the two three-phase output terminals, so that the three-phase power supply directly outputs three-phase electricity through the three-phase output terminals or adjusts the three-phase power supply to a single-phase power supply and then outputs single-phase electricity through the single-phase output terminals.

[0006] Another embodiment of the present application relates to a power output switching system, comprising: a host computer, a PLC, a relay, a switching power supply, two three-phase power supplies and the power output switching device as described above; the host computer is used to issue control instructions to the PLC; the PLC is used to control the conduction of each phase line level line in the switching matrix through the relay; the switching power supply is used to power the PLC, the relay and the power output switching device.

[0007] Compared with the prior art, the embodiment of the present application sets two three-phase input terminals, two three-phase output terminals, two single-phase output terminals and a switching matrix, and uses the switching matrix to control the conduction state of each phase line-level line between each three-phase input terminal to two three-phase output terminals and two single-phase output terminals, so that the three-phase power supply can output three-phase electricity directly through the three-phase output terminal and can also output single-phase electricity through the single-phase output terminal. When the two three-phase power supplies have electricity at the same time, the two three-phase output terminals and the two single-phase output terminals can output power individually or in any combination of two. That is, different line topologies are formed only by controlling the conduction of each phase line-level line in the switching matrix to achieve different output modes, which greatly reduces the workload of manual wiring and improves test efficiency.

[0008] In some embodiments, the switching matrix as described above includes first connecting lines from each phase line of each of the three-phase input terminals to each phase line of each of the three-phase output terminals, and first switches located on each first connecting line.

[0009] In some embodiments, the three-phase power supply as described above directly outputs three-phase electricity through the three-phase output terminal, including: each of the first connection lines between the three-phase output terminal that outputs the three-phase electricity and one of the three-phase input terminals is connected, and each of the first connection lines between the three-phase output terminal and another of the three-phase input terminals is disconnected.

[0010] In some embodiments, the three-phase power supply as described above directly outputs three-phase electricity through the three-phase output terminal, including: the three-phase output terminal that outputs three-phase electricity is connected to the first connecting line of a part of the three-phase input terminal, and at the same time, the three-phase output terminal that outputs three-phase electricity is connected to the first connecting line of another part of the three-phase input terminal, and the connected first connecting lines complement each other to form a complete three-phase electricity output.

[0011] In some embodiments, the switching matrix as described above includes second connection lines from each phase line of each of the three-phase input terminals to each phase line of each of the single-phase output terminals, and second switches located on each second connection line.

[0012] In some embodiments, after the three-phase power supply is adjusted to a single-phase power supply as described above, the corresponding state of outputting single-phase electricity through the single-phase output terminal is: at least a portion of the second connecting line between the live wire end of the single-phase output terminal that outputs single-phase electricity and one of the three-phase input terminals is connected, and the neutral wire end is connected to the neutral wire of the three-phase input terminal.

[0013] In some embodiments, after the three-phase power supply is adjusted to a single-phase power supply as described above, the corresponding state of outputting single-phase electricity through the single-phase output terminal is: at least a portion of the second connecting line between the live wire end of the single-phase output terminal that outputs single-phase electricity and one of the three-phase input terminals is connected, and the neutral wire end is connected to the neutral wire of another of the three-phase input terminals.

[0014] In some embodiments, after the three-phase power supply is adjusted to a single-phase power supply as described above, the corresponding state of outputting single-phase electricity through the single-phase output terminal is: the live wire end of the single-phase output terminal that outputs single-phase electricity is connected to at least a portion of the second connecting line between one of the three-phase input terminals, and is connected to at least a portion of the second connecting line between another of the three-phase input terminals, and the neutral wire end is connected to the neutral wire of any one of the three-phase input terminals.

[0015] In some embodiments, the switching matrix as described above is also used to control the first connecting lines between the two three-phase output terminals that output three-phase electricity and one of the three-phase input terminals to be respectively connected, and the neutral line of one of the three-phase output terminals is connected to the first connecting line where the neutral line between the three-phase input terminals that is not connected to it is located, so as to obtain a six-phase output. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0017] Figure 1 A schematic diagram of a power output switching device provided according to an embodiment of the present application Figure 1 ;

[0018] Figure 2 It is a schematic diagram of the structure of a power output switching system provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0019] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. However, it will be appreciated by those skilled in the art that in the present application, many technical details are proposed in order to enable the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present application can also be implemented. The division of the following embodiments is for the convenience of description, and the specific implementation of the present application should not be construed as any limitation, and the various embodiments can be combined and referenced with each other under the premise of no contradiction.

[0020] One embodiment of the present application relates to a power output switching device, such as Figure 1 As shown, it includes: two three-phase input terminals (three-phase input terminal 1, three-phase input terminal 2), two three-phase output terminals (three-phase output terminal 1, three-phase output terminal 2), two single-phase output terminals (single-phase output terminal 1, single-phase output terminal 2) and a switching matrix;

[0021] Among them, the two three-phase input terminals are respectively connected to a three-phase power supply; the switching matrix is ​​used to control the conduction state of each phase line-level line between each three-phase input terminal to two three-phase output terminals and to two single-phase output terminals, so that the three-phase power supply can directly output three-phase electricity through the three-phase output terminal or adjust the three-phase power supply to a single-phase power supply and then output single-phase electricity through the single-phase output terminal.

[0022] Specifically, the three-phase power supply in this embodiment adopts a three-phase five-wire system, that is, two three-phase input terminals (three-phase input terminal 1, three-phase input terminal 2) and two three-phase output terminals (three-phase output terminal 1, three-phase output terminal 2) have three phase wires A, B, and C, a neutral wire N and a ground wire PE (protecting earthing). The two three-phase power supplies are respectively connected to the three-phase input terminal 1 and the three-phase input terminal 2. The switching matrix is ​​used to connect the three-phase input terminal with the two three-phase output terminals and the two single-phase output terminals, and control the conduction state of each phase line-level line between each three-phase input terminal and the two three-phase output terminals, and to the two single-phase output terminals. Among them, the phase line-level line refers to the corresponding connection line between the three phase wires A, B, and C, the neutral wire N and the PE wire of the three-phase input terminal and the three phase wires A, B, and C, the neutral wire N and the PE wire of the three-phase output terminal, as well as the three phase wires A, B, and C of the three-phase input terminal and the live wire terminal of the single-phase output terminal (such as Figure 1 The three-phase power supply can be directly output three-phase power through the three-phase output terminal, or the three-phase power supply can be adjusted to a single-phase power supply and then output single-phase power through the single-phase output terminal.

[0023] This means that when two three-phase power supplies (three-phase power supply A and three-phase power supply B) supply power to the output terminal at the same time, two three-phase output terminals (three-phase output terminal 1, three-phase output terminal 2) and two single-phase output terminals (single-phase output terminal 1, single-phase output terminal 2) can be combined to form a variety of output power supply modes. For example, three-phase output terminal 1 and three-phase output terminal 2 independently output three-phase electricity at the same time, or single-phase output terminal 1 and single-phase output terminal 2 independently output single-phase electricity at the same time, or three-phase output terminal 1 outputs three-phase electricity while single-phase output terminal 1 outputs single-phase electricity, or three-phase output terminal 2 outputs three-phase electricity while single-phase output terminal 1 outputs single-phase electricity, or three-phase output terminal 2 outputs three-phase electricity while single-phase output terminal 2 outputs single-phase electricity, etc. The specific output can be switched on by switching the corresponding lines in the matrix according to actual needs, and this application does not make specific restrictions on this.

[0024] Compared with the related art, this embodiment sets two three-phase input terminals, two three-phase output terminals, two single-phase output terminals and a switching matrix, and uses the switching matrix to control the conduction state of each phase line-level line between each three-phase input terminal to two three-phase output terminals and two single-phase output terminals, so that the three-phase power supply can output three-phase electricity directly through the three-phase output terminal and can also output single-phase electricity through the single-phase output terminal. When the two three-phase power supplies have electricity at the same time, the two three-phase output terminals and the two single-phase output terminals can output power individually or in any combination of two. That is, different line topologies are formed only by controlling the conduction of each phase line-level line in the switching matrix to achieve different output modes, which greatly reduces the workload of manual wiring and improves test efficiency.

[0025] Another embodiment of the present application relates to a power output switching device, such as Figure 1 As shown, this embodiment is a supplementary description of the above-mentioned embodiment, and specifically involves the following contents.

[0026] In one example, the switching matrix includes first connecting lines from each phase line of each three-phase input terminal to each phase line of each three-phase output terminal, and first switches located on each first connecting line.

[0027] Specifically, a first connection line can be set between each phase line of each three-phase input terminal and each phase line of each three-phase output terminal, that is, a first connection line can be set between three-phase input terminal 1 and three-phase output terminal 1, three-phase input terminal 1 and three-phase output terminal 2, three-phase input terminal 2 and three-phase output terminal 1, and three-phase input terminal 2 and three-phase output terminal 2. The first connection line is a one-to-one corresponding connection line between the three-phase input terminal A, B, C three phase lines, neutral line N and the three-phase output terminal A, B, C three phase lines, neutral line N. Figure 1As shown, taking the three-phase input terminal 1 and the three-phase output terminal 1 as an example, the first connection line between the two is the line where the first switch (K1, K2, K3, K4) is located and the line where the PE line connecting the PE end of the three-phase input terminal 1 and the PE end of the three-phase output terminal 1 is located.

[0028] It should be noted that a PE line is connected between any three-phase input terminal and the PE terminal of any three-phase output terminal, and a switch may or may not be set on the PE line. In this application, unless otherwise specified, a PE line is connected between any three-phase input terminal and any three-phase output terminal, that is, the first connection line includes the PE line by default, and no further description will be given when the connection line is described later.

[0029] like Figure 1 As shown, the line connecting the three-phase input terminal 2 and the three-phase output terminal 2, that is, the line where the first switch (K9, K10, K11, K12) is located, is also the first connection line. The line connecting the three-phase input terminal 2 and the three-phase output terminal 1, that is, the line where the first switch (K17, K18, K19, K20) is located, is also the first connection line. It should be noted that Figure 1 The first connection line between the three-phase input terminal 1 and the three-phase output terminal 2 is not given, but in actual application, the first connection line can be set between any three-phase input terminal and any three-phase output terminal. Figure 1 It is only for facilitating the understanding of the present application and does not constitute any limitation to the present application.

[0030] In one example, the three-phase power supply directly outputs three-phase electricity through the three-phase output terminal, including: the three-phase output terminal outputting the three-phase electricity is connected to each first connection line between a three-phase input terminal, and is disconnected from each first connection line between the other three-phase input terminal.

[0031] Specifically, since each three-phase output terminal is connected to two three-phase input terminals, when the three-phase power supply directly outputs three-phase electricity through a three-phase output terminal, the switching matrix can select a first connection line between a three-phase input terminal and a three-phase output terminal outputting three-phase electricity to be turned on. Figure 1 As shown, the switching matrix can conduct each phase line (first connection line) between the three-phase output terminal 1 and the three-phase input terminal 1, while ensuring that other first connection lines in the switching matrix are disconnected, especially the first connection line between the three-phase output terminal 1 and the three-phase input terminal 2. That is, the three-phase power output to the output terminal can be provided by a three-phase power supply through a three-phase input terminal.

[0032] Alternatively, in another example, the three-phase power supply directly outputs three-phase electricity through a three-phase output terminal, including: a portion of a first connecting line between the three-phase output terminal that outputs the three-phase electricity and a three-phase input terminal is turned on, and at the same time, the three-phase output terminal that outputs the three-phase electricity is turned on with a portion of the first connecting line of another three-phase input terminal, and the turned-on first connecting lines complement each other to form a complete three-phase electricity output.

[0033] Specifically, since each three-phase output terminal is connected to two three-phase input terminals, when the three-phase power supply directly outputs three-phase electricity through one three-phase output terminal, the switching matrix can select a portion of the phase line level lines (first connection lines) between the three-phase output terminals outputting three-phase electricity and one three-phase input terminal to be turned on, and at the same time select a portion of the phase line level lines between the three-phase output terminals outputting three-phase electricity and another three-phase input terminal to be turned on, and all the turned-on lines can ensure that the three-phase output terminals outputting three-phase electricity have a complete three-phase electricity output. Figure 1 As shown, the three-phase output terminal 1 is connected to the three-phase input terminal 1 and the three-phase input terminal 2 at the same time. The switching matrix can make the three-phase output terminal 1 output complete three-phase electricity by conducting the lines where K1 and K2 are located between the three-phase output terminal 1 and the three-phase input terminal 1, and conducting the lines where K19 and K20 are located between the three-phase output terminal 1 and the three-phase input terminal 2. That is, the three-phase power supply A provides the A phase and the B phase of the three-phase electricity to the three-phase output terminal 1 through the three-phase input terminal 1, and the three-phase power supply B provides the C phase and the neutral line to the three-phase output terminal 1 through the three-phase input terminal 2. The line-level lines (first connection lines) of each phase between the three-phase output terminal 1 and the three-phase input terminal 1 ensure that other lines in the switching matrix are disconnected, especially the first connection line between the three-phase output terminal 1 and the three-phase input terminal 2. That is, the three-phase electricity output to the output terminal of a three-phase is provided by a three-phase power supply through a three-phase input terminal. That is, the three-phase electricity outputted from a three-phase output terminal can be provided by two three-phase power supplies through two three-phase input terminals.

[0034] In another example, the switching matrix is ​​also used to control the first connecting line between two three-phase output terminals that output three-phase electricity and a three-phase input terminal to be conductive, and the neutral line of one of the three-phase output terminals is conductive to the first connecting line where the neutral line between the three-phase input terminal that is not conductive with it is located, so as to obtain a six-phase output.

[0035] Specifically, Figure 1As shown, the first connecting line between the three-phase input terminal 1 and the three-phase output terminal 1 (the line where K1, K2, K3, and K4 are located) can be turned on, and at the same time, the first connecting line between the three-phase input terminal 2 and the three-phase output terminal 2 (the line where K9, K10, K11, and K12 are located) can be turned on. At the same time, the first connecting line where the neutral line connected between the three-phase input terminal 2 and the three-phase input terminal 1 that is not turned on is located (that is, the line where K20 is located) is turned on, and all the first connecting lines are disconnected at the same time, so that the two three-phase power supplies can output six phases through the two three-phase output terminals.

[0036] In another example, the switching matrix includes second connection lines from each phase line of each three-phase input terminal to each phase line of each single-phase output terminal, and second switches located on each second connection line.

[0037] Specifically, Figure 1 As shown, a second connection line can be set between each phase line of each three-phase input terminal and each phase line of each single-phase output terminal, that is, a second connection line can be set between the three-phase input terminal 1 and the single-phase output terminal 1, the three-phase input terminal 1 and the single-phase output terminal 2 (not shown in the figure), the three-phase input terminal 2 and the single-phase output terminal 1, and the three-phase input terminal 2 and the single-phase output terminal 2. The second connection line is the connection line between the three phase lines A, B, and C of the three-phase input terminal and the L terminal of the single-phase output terminal, the zero line N of the three-phase output terminal and the zero line N of the single-phase output terminal, and the connection line between the PE line of the three-phase output terminal and the PE line of the single-phase output terminal. As shown in FIG. Figure 1 As shown, taking the three-phase input terminal 1 and the single-phase output terminal 1 as an example, the second connection line between the two is the line where the second switch (K5, K6, K7, K8) is located and the line where the PE line connecting the PE end of the three-phase input terminal 1 and the PE end of the three-phase output terminal 1 is located.

[0038] It should be noted that a PE line is connected between any three-phase input terminal and the PE terminal of any unidirectional output terminal, and a switch may or may not be set on the PE line. In this application, unless otherwise specified, a PE line is connected between any three-phase input terminal and any unidirectional output terminal, that is, the second connection line includes the PE line by default, and no further description will be given later when describing the connection line.

[0039] like Figure 1 As shown, the line connecting the three-phase input terminal 2 and the single-phase output terminal 2, that is, the line where the second switch (K13, K14, K15, K16) is located, is also the second connection line. The line connecting the three-phase input terminal 2 and the single-phase output terminal 1, that is, the line where the second switch (K21, K22, K23, K24) is located, is also the second connection line. It should be noted that Figure 1The second connection line between the three-phase input terminal 1 and the single-phase output terminal 2 is not given in the figure, but in actual application, a second connection line can be set between any three-phase input terminal and any single-phase output terminal. Figure 1 It is only for facilitating the understanding of the present application and does not constitute any limitation to the present application.

[0040] In one example, after the three-phase power supply is adjusted to a single-phase power supply, the corresponding state of outputting single-phase power through the single-phase output terminal is:

[0041] At least part of the second connection line between the live wire end of the single-phase output end outputting single-phase electricity and a three-phase input end is conductive, and the neutral wire end is conductive with the neutral wire of the three-phase input end.

[0042] Alternatively, at least part of the second connection line between the live wire end of the single-phase output terminal outputting single-phase electricity and one three-phase input terminal is conductive, and the neutral wire end is conductive with the neutral wire of another three-phase input terminal.

[0043] Alternatively, the live wire end of the single-phase output terminal that outputs single-phase electricity is connected to at least part of the second connecting line between one three-phase input terminal, is connected to at least part of the phase line level line between the other three-phase input terminal, and the neutral wire end is connected to the neutral wire of any one of the three-phase input terminals.

[0044] like Figure 1 As shown, if single-phase electricity is output to the outside through the single-phase output terminal 1, the second connection line where K5, K6, K7, and K8 are located between the single-phase output terminal 1 and the three-phase input terminal 1 can be turned on, and all other second connection lines can be disconnected at the same time, that is, the single-phase electricity output to the outside from a single-phase output terminal can be provided by a three-phase power supply through a three-phase input terminal. Alternatively, the second connection line where the second switches K5, K6, and K7 are located between the single-phase output terminal 1 and the three-phase input terminal 1 is turned on, and the second connection line where the second switch K24 is located between the single-phase output terminal 1 and the three-phase input terminal 1 is turned on, and all other second connection lines are disconnected at the same time. Alternatively, the second connection line where the second switches K5 and K6 between the single-phase output terminal 1 and the three-phase input terminal 1 are located is turned on, and the second connection line where the second switches K23 and K24 between the single-phase output terminal 1 and the three-phase input terminal 1 are located is turned on, and all other second connection lines are disconnected, that is, the single-phase power output from a single-phase output terminal can be provided by two three-phase power supplies through two three-phase input terminals. This application does not impose specific restrictions on this.

[0045] This application Figure 1 For example, in actual applications, different output modes can be achieved by closing different first switches and / or second switches, as shown in the following table.

[0046]

[0047] When two sets of three-phase power supplies independently output three-phase, the first switches K1, K2, K3, K4 K9, K10, K11, and K12 are closed, and other switches are disconnected; when two sets of three-phase power supplies independently output single-phase, the second switches K5, K6, K7, K8, K13, K14, K15, and K16 are closed, and other switches are disconnected; when two sets of three-phase power supplies are connected in parallel for three-phase output, the first switches K1, K2, K3, K4, K17, K18, K19, and K20 are closed, and other switches are disconnected; when two sets of three-phase power supplies are connected in parallel for single-phase output, the second switches K5, K6, K7, K8, K21, K22, K23, and K24 are closed, and other switches are disconnected; when two sets of three-phase power supplies output six-phase, the first switches K1, K2, K3, K4, K9, K10, K11, K12, and K20 are closed, and other switches are disconnected. In addition, any solutions that use the concept of this application to combine two three-phase power supplies to produce different outputs will no longer be listed one by one, but are all within the scope of protection of this application.

[0048] Compared with the related art, the embodiment of the present application obtains single-phase electrical output, three-phase electrical output or six-phase electrical output by controlling the conduction of the first connecting line between each phase line of each three-phase input terminal to each phase line of each three-phase output terminal in the switching matrix and the conduction of the second connecting line between each phase line of each three-phase input terminal to each phase line of each single-phase output terminal, thereby realizing different output modes, greatly reducing the workload of manual wiring and improving testing efficiency.

[0049] Another embodiment of the present application relates to a power output switching system, such as Figure 1 As shown, it includes: a host computer, a PLC (Programmable Logic Controller), a relay, a switching power supply, two three-phase power supplies and a power output switching device as described in any of the above embodiments;

[0050] The host computer is used to send control instructions to the PLC; the PLC is used to control the conduction of each phase line in the switching matrix through the relay; the switching power supply is used to supply power to the PLC, the relay and the power output switching device. Figure 1As shown, the on-off control of each line in the switching matrix is ​​realized by PLC, and the control system of the switching matrix is ​​mainly composed of four parts, including a host computer, a switching power supply, a PLC, and an intermediate relay. The host computer writes a program to control the PLC, and the switching power supply provides a 24V voltage signal, controls the closing and opening of the first switch and the second switch through the intermediate relay, and then feeds back the on-off signal information of the first switch and the second switch to the PLC. The host computer reads the on-off signal information of the first switch and the second switch obtained by the PLC to determine whether the first switch and the second switch are operating correctly. If the system determines that the operation of the first switch and the second switch is incorrect, all switches are disconnected. It should be noted that the contents related to the switching matrix and the power output switching device have been recorded in the above-mentioned embodiments, and this application will not be repeated here.

[0051] It should be noted that the above examples in this embodiment are illustrative for easy understanding and do not limit the technical solution of this application. The steps of the above methods are divided only for the purpose of clear description. When implemented, they can be combined into one step or some steps can be split and decomposed into multiple steps. As long as they include the same logical relationship, they are all within the protection scope of this patent; adding insignificant modifications to the algorithm or process or introducing insignificant designs, but not changing the core design of the algorithm and process, are all within the protection scope of this application.

[0052] Those skilled in the art will appreciate that the above embodiments are specific embodiments for implementing the present application, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present application.

Claims

1. A power output switching device, characterized in that: include: Two three-phase input terminals, two three-phase output terminals, two single-phase output terminals and a switching matrix; The two three-phase input terminals are respectively connected to a three-phase power supply; The switching matrix is ​​used to control the conduction state of each phase line between each of the three-phase input terminals and the two three-phase output terminals, so that the three-phase power supply directly outputs three-phase electricity through the three-phase output terminals or adjusts the three-phase power supply to a single-phase power supply and then outputs single-phase electricity through the single-phase output terminals.

2. The power output switching device according to claim 1, characterized in that: The switching matrix includes first connecting lines from each phase line of each three-phase input terminal to each phase line of each three-phase output terminal, and first switches located on each first connecting line.

3. The power output switching device according to claim 2, characterized in that: The three-phase power supply directly outputs three-phase electricity through the three-phase output terminal, including: the three-phase output terminal that outputs three-phase electricity is connected to each of the first connection lines between one of the three-phase input terminals, and is disconnected from each of the first connection lines between another of the three-phase input terminals.

4. The power output switching device according to claim 2, characterized in that: The three-phase power supply directly outputs three-phase electricity through the three-phase output terminal, including: part of the first connecting line between the three-phase output terminal that outputs three-phase electricity and one of the three-phase input terminals is connected, and at the same time, part of the first connecting line between the three-phase output terminal that outputs three-phase electricity and another three-phase input terminal is connected, and the connected first connecting lines complement each other to form a complete three-phase electricity output.

5. The power output switching device according to claim 1, characterized in that: The switching matrix includes second connection lines from each phase line of each three-phase input terminal to each phase line of each single-phase output terminal, and second switches located on each second connection line.

6. The power output switching device according to claim 5, characterized in that: The state corresponding to outputting single-phase power through the single-phase output terminal after adjusting the three-phase power supply to a single-phase power supply is: At least part of the second connection line between the live wire end of the single-phase output end that outputs single-phase electricity and one of the three-phase input ends is conductive, and the neutral wire end is conductive with the neutral wire of the three-phase input end.

7. The power output switching device according to claim 5, characterized in that: The state corresponding to outputting single-phase power through the single-phase output terminal after adjusting the three-phase power supply to a single-phase power supply is: At least part of the second connection line between the live wire end of the single-phase output terminal that outputs single-phase electricity and one of the three-phase input terminals is conductive, and the neutral wire end is conductive with the neutral wire of another of the three-phase input terminals.

8. The power output switching device according to claim 5, characterized in that: The state corresponding to outputting single-phase power through the single-phase output terminal after adjusting the three-phase power supply to a single-phase power supply is: The live wire end of the single-phase output terminal that outputs single-phase electricity is connected to at least part of the second connecting line between one of the three-phase input terminals, and is connected to at least part of the second connecting line between another of the three-phase input terminals, and the neutral wire end is connected to the neutral wire of any one of the three-phase input terminals.

9. The power output switching device according to claim 2, characterized in that: The switching matrix is ​​also used to control the first connecting line between the two three-phase output terminals that output three-phase electricity to be respectively connected to one of the three-phase input terminals, and the first connecting line where the neutral line of one of the three-phase output terminals is located and the neutral line between the three-phase input terminals that are not connected to it is connected to obtain a six-phase output.

10. A power output switching system, characterized in that: include: A host computer, a PLC, a relay, a switching power supply, two three-phase power supplies, and a power output switching device as described in any one of claims 1 to 9; The host computer is used to issue control instructions to the PLC; the PLC is used to control the conduction of each phase-level line in the switching matrix through the relay; the switching power supply is used to supply power to the PLC, the relay and the power output switching device.

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