A universal satellite power supply and distribution equivalent device

Abstract

The present invention discloses a universal satellite power supply and distribution equivalent. When verifying ground power supply and distribution equipment, an industrial computer generates control instructions through an LCD screen or external device and transmits the instructions to a single-chip microcomputer on a motherboard. After receiving the instructions, the single-chip microcomputer on the motherboard generates a path selection instruction and a function selection instruction, and sends the path selection instruction to a switch matrix daughter board and the function selection instruction to a functional equivalent daughter board. After receiving the path selection instruction, the switch matrix daughter board turns on or off the corresponding optical isolation FET to implement the path selection function. After receiving the function selection instruction, the functional equivalent daughter board drives the optical isolation FET to turn on or off to select the corresponding equivalent module. Thus, the functional equivalent daughter board can simulate the satellite receiving wired instructions and monitoring the correctness of the instructions, simulate the transmission of wired telemetry signals on the satellite, and monitor the power supply voltage of the array power supply or the centralized power supply to detect whether the functional performance of the ground equipment is normal.

Description

Technical Field

[0001] The present invention relates to the technical field of satellite power supply and distribution equivalent devices, in particular to a universal satellite power supply and distribution equivalent device used for verifying the functional performance of satellite power supply and distribution ground equipment. Background Art

[0002] The satellite power supply and distribution equivalent device is connected to the power supply and distribution system. By simulating the satellite's power supply, measurement and control signals, it verifies the correctness of the hardware and software design and the interface coordination of the ground power supply and distribution test equipment, ensuring that the ground power supply and distribution equipment works reliably and stably.

[0003] Satellite equivalents are developed based on the contact allocation of discrete electrical connectors. Since the satellites currently under development have significant differences in their ground power supply, critical wired commands, and parameter measurement requirements, the traditional approach is to design a dedicated satellite equivalent for each satellite, which lacks universality. One improvement is to develop adapter cables from discrete electrical connectors to satellite equivalents for satellites with different technical statuses, thereby reusing satellite equivalents. However, adapter cables must still be designed for each satellite with different technical status, increasing the designer's workload. Furthermore, the functionality of existing equivalents cannot meet the needs of some newly developed satellites. Each model is equipped with its own satellite equivalent or corresponding adapter cable, which makes storage, management, and search inconvenient, and results in a waste of resources.

[0004] Therefore, there is an urgent need in this field for a satellite power supply and distribution equivalent device with strong versatility and scalability. Summary of the Invention

[0005] The present invention provides a universal satellite power supply and distribution equivalent device. By applying a switch matrix, the universalization of the satellite power supply and distribution equivalent device is achieved. The device has strong scalability and meets the application requirements of the satellite power supply and distribution equivalent device.

[0006] In a first aspect, a universal satellite power supply and distribution equivalent device is provided, comprising a motherboard, a switch matrix daughterboard, a functional equivalent daughterboard, and a power supply sub-board; the switch matrix daughterboard, the functional equivalent daughterboard, and the power supply sub-board are all plugged into the motherboard; the power supply sub-board is used to supply power to the motherboard, and to supply power to the switch matrix daughterboard and the functional equivalent daughterboard through the motherboard;

[0007] The switch matrix daughter board includes a first positive bus and a first negative bus. The first positive bus of the switch matrix daughter board is connected to the second positive bus of the functional equivalent daughter board through the motherboard. The first negative bus of the switch matrix daughter board is connected to the second negative bus of the functional equivalent daughter board through the motherboard. The functional equivalent daughter board is used to simulate the satellite receiving wired commands and monitoring the correctness of the commands, simulate the transmission of wired telemetry signals on the satellite, and monitor the power supply voltage of the array power supply or the centralized power supply to detect whether the functional performance of the ground equipment is normal.

[0008] N Class A positive terminals are provided on the positive optical isolation circuit, the N Class A positive terminals are connected via a first positive terminal bus, and are electrically connected to the card output positive terminal of the switch matrix daughter board; N Class A negative terminals are provided on the negative optical isolation circuit, the N Class A negative terminals are connected via a first negative terminal bus, and are electrically connected to the card output negative terminal of the switch matrix daughter board; the N Class A positive terminals correspond one to one with the N Class A negative terminals;

[0009] An optical isolation FETi+ and an optical isolation FETi- are arranged between the i-th Class A positive terminal and the i-th Class A negative terminal, wherein the first end of the optical isolation FETi+ is electrically connected to the i-th Class A positive terminal, the second end of the optical isolation FETi+ is electrically connected to the first end of the optical isolation FETi-, and the second end of the optical isolation FETi- is electrically connected to the i-th Class A negative terminal; an i-th path terminal is drawn between the second end of the optical isolation FETi+ and the first end of the optical isolation FETi-, 1≤i≤N.

[0010] In combination with the first aspect, in certain implementations of the first aspect, when the optical isolation FETa+ and the optical isolation FETb- are controlled to be turned on, 1≤a≤N, 1≤b≤N, a≠b, the ground power supply and distribution test equipment is connected to the first positive end bus through the ath Class A positive terminal, and then connected to the second positive end bus of the functionally equivalent sub-board, and the ground power supply and distribution test equipment is connected to the first negative end bus through the bth Class A negative terminal, and then connected to the second negative end bus of the functionally equivalent sub-board, so that the power supply and distribution ground equipment is connected to the equivalent module of the functionally equivalent sub-board through the ath path terminal and the bth path terminal of the switch matrix sub-board.

[0011] In combination with the first aspect, in some implementations of the first aspect, the power supply and distribution equivalent device further includes an industrial computer, which is used to control the conduction state of the switch matrix sub-board.

[0012] In combination with the first aspect, in certain implementations of the first aspect, the switch matrix daughter board further includes an FPGA and a decoder, the optical isolation FET is driven by the decoder, and the FPGA provides a control signal for the decoder.

[0013] In conjunction with the first aspect, in certain implementations of the first aspect, the functionally equivalent daughter board includes a second positive bus, a second negative bus, and M different equivalent modules; M Class II positive terminals are provided on the positive optical isolation circuit, the M Class II positive terminals are connected via the second positive bus, and are electrically connected to the card output positive terminal of the switch matrix daughter board; M Class II negative terminals are provided on the negative optical isolation circuit, the M Class II negative terminals are connected via the second negative bus, and are electrically connected to the card output negative terminal of the switch matrix daughter board; the M Class II positive terminals correspond one-to-one to the M Class II negative terminals;

[0014] An optical isolation FETj+, an optical isolation FETj- and a j-th equivalent module are arranged between the j-th Class-II positive terminal and the j-th Class-II negative terminal, wherein the first end of the optical isolation FETj+ is electrically connected to the j-th Class-II positive terminal, the second end of the optical isolation FETj+ is electrically connected to the first end of the j-th equivalent module, the second end of the j-th equivalent module is electrically connected to the first end of the optical isolation FETj-, and the second end of the optical isolation FETj- is electrically connected to the j-th Class-II negative terminal, 1≤j≤M.

[0015] In combination with the first aspect, in certain implementations of the first aspect, if the optical isolation FETc+ and the optical isolation FETc- are controlled to be turned on, 1≤c≤M, the ground power supply and distribution test equipment is connected to the cth equivalent module of the functionally equivalent sub-board through the switch matrix sub-board.

[0016] In conjunction with the first aspect, in certain implementations of the first aspect, the M equivalent modules of the functionally equivalent daughter board include a power supply / 28V instruction equivalent module, an analog equivalent module, a passive instruction equivalent module, and a passive state equivalent module;

[0017] The positive terminal of the power supply / 28V instruction equivalent module is connected to the optical isolation FETA+, and the other terminal of the optical isolation FETA+ is connected to the second positive terminal bus of the functional equivalent daughter board. The negative terminal of the power supply / 28V instruction equivalent module is connected to the optical isolation FETA-, and the other terminal of the optical isolation FETA- is connected to the second negative terminal bus of the functional equivalent daughter board.

[0018] The positive end of the analog equivalent module is connected to the optical isolation FETB+, and the other end of the optical isolation FETB+ is connected to the second positive end bus of the functional equivalent daughter board. The negative end of the analog equivalent module is connected to the optical isolation FETB-, and the other end of the optical isolation FETB- is connected to the second negative end bus of the functional equivalent daughter board.

[0019] The positive end of the passive instruction equivalent module is connected to the optical isolation FETC+, and the other end of the optical isolation FETC+ is connected to the second positive end bus of the functional equivalent daughter board. The negative end of the passive instruction equivalent module is connected to the optical isolation FETC-, and the other end of the optical isolation FETC- is connected to the second negative end bus of the functional equivalent daughter board.

[0020] The positive end of the passive state equivalent module is connected to the optical isolation FETD+, and the other end of the optical isolation FETB+ is connected to the second positive end bus of the functional equivalent daughter board. The negative end of the passive state equivalent module is connected to the optical isolation FETD-, and the other end of the optical isolation FETD- is connected to the second negative end bus of the functional equivalent daughter board.

[0021] In combination with the first aspect, in certain implementations of the first aspect, the power supply and distribution equivalent device further includes a liquid crystal screen and an industrial computer;

[0022] When verifying the power supply and distribution ground equipment, the industrial computer generates control instructions through the LCD screen or external devices and transmits the instructions to the microcontroller on the motherboard;

[0023] After receiving the instruction, the MCU on the motherboard generates a path selection instruction and a function selection instruction, and sends the path selection instruction to the FPGA of the switch matrix daughter board and sends the function selection instruction to the FPGA of the functionally equivalent daughter board;

[0024] After receiving the path selection instruction, the FPGA of the switch matrix daughter board drives the decoder to turn on or off the corresponding optical isolation FET to realize the path selection function;

[0025] After receiving the function selection instruction, the FPGA of the functional equivalent daughter board drives the optical isolation FET to be turned on or off to select the corresponding equivalent module.

[0026] In combination with the first aspect, in certain implementations of the first aspect, the signal generated by the equivalent module is transmitted to the power supply and distribution ground equipment through the optical isolation FET corresponding to the equivalent module, the second positive bus and the second negative bus of the functional equivalent sub-board, the motherboard, the first positive bus and the first negative bus of the switch matrix sub-board, the conductive optical isolation FET of the switch matrix sub-board, and the terminal of the switch matrix sub-board, and whether the power supply and distribution ground equipment is normal is judged based on the status of the power supply and distribution ground equipment.

[0027] In combination with the first aspect, in certain implementations of the first aspect, the signal generated by the power supply and distribution ground equipment is sent to the corresponding equivalent module through the terminals of the switch matrix sub-board, the optical isolation FET turned on by the switch matrix sub-board, the first positive end bus and the first negative end bus of the switch matrix sub-board, the motherboard, the second positive end bus and the second negative end bus of the functionally equivalent sub-board, and the equivalent module determines whether the power supply and distribution ground equipment is working normally based on the received signal.

[0028] Compared with the prior art, the solution provided by the present invention includes at least the following beneficial technical effects:

[0029] (1) The present invention adopts a switch matrix sub-board to select the path required for testing. When verifying the power supply and distribution ground equipment, it is no longer restricted by the distribution of separate electrical connector contacts. It is applicable to the power supply and distribution equivalence of any satellite, reduces the manpower and material costs of developing cables, and shortens the test preparation time.

[0030] (2) The present invention adopts a method of combining a switch matrix sub-board with a functional equivalent sub-board. Each signal in the functional equivalent sub-board only needs to be produced in one channel, and there is no need to correspond to the number of signals on the satellite, thereby reducing the size and weight of the equipment and having strong adaptability.

[0031] (3) The present invention adopts the form of plug-in connection between the motherboard and the daughterboard, which has strong expandability. When the satellite has new functions that need to be simulated, a new functional daughterboard is added and plugged into the motherboard to complete the transformation and upgrade of the equivalent device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is the system block diagram of a universal power supply and distribution equivalent device for satellites.

[0033] Figure 2 This is a structural diagram of a universal power supply and distribution equivalent device for satellites.

[0034] Figure 3 This is a schematic diagram of the switch matrix daughter board power circuit.

[0035] Figure 4 This is a schematic diagram of the drive circuit of the optical isolation FET.

[0036] Figure 5 It is a module schematic diagram of a functionally equivalent daughter board. DETAILED DESCRIPTION

[0037] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0038] See Figure 1 and Figure 2 , Figure 1 is a system block diagram of the present invention, Figure 2 It is a structural schematic diagram of the present invention.

[0039] Depend on Figure 1 and Figure 2 It can be seen that the satellite's universal power supply and distribution equivalent device includes: universal separation plug adapter cable, chassis, LCD screen, industrial computer, motherboard, switch matrix daughter board, functional equivalent daughter board and power supply sub-board.

[0040] One end of the universal breakaway plug can be a YF8-64Z electrical connector for connecting to the breakaway plug of the star-rocket cable, and the other end can be a J14-74TK electrical connector for connecting to the terminals of the switch matrix daughterboard. The LCD screen is fixed to the front of the chassis and connected to the industrial computer. The industrial computer is fixed behind the LCD screen and is used for user interaction, data processing and storage, interface display, remote command processing, etc. It communicates with the microcontroller on the motherboard and external devices via the LAN interface. The switch matrix daughterboard, functional equivalent daughterboard, and power supply subboard are all plugged into the motherboard. The power supply subboard is used to power the motherboard, and power the switch matrix daughterboard and functional equivalent daughterboard through the motherboard. The switch matrix daughterboard and functional equivalent daughterboard exchange information through the motherboard.

[0041] In one specific embodiment, the switch matrix daughter board includes a first positive bus and a first negative bus. N Class I positive terminals are provided on the positive optical isolation circuit. These N Class I positive terminals are connected via the first positive bus and electrically connected to the positive output terminal of the switch matrix daughter board. N Class I negative terminals are provided on the negative optical isolation circuit. These N Class I negative terminals are connected via the first negative bus and electrically connected to the negative output terminal of the switch matrix daughter board. The N Class I positive terminals correspond one-to-one to the N Class I negative terminals.

[0042] An optical isolation FETi+ and an optical isolation FETi- are provided between the i-th Class-I positive terminal (1≤i≤N) and the i-th Class-I negative terminal. The first end of the optical isolation FETi+ is electrically connected to the i-th Class-I positive terminal, the second end of the optical isolation FETi+ is electrically connected to the first end of the optical isolation FETi-, and the second end of the optical isolation FETi- is electrically connected to the i-th Class-I negative terminal. An i-th path terminal is provided between the optical isolation FETi+ and the optical isolation FETi-. In other words, the i-th path terminal is provided between the second end of the optical isolation FETi+ and the first end of the optical isolation FETi-.

[0043] See Figure 3 The switch matrix daughterboard comprises optically isolated FETs, forming a power circuit with 64 paths. Each path is equipped with two optically isolated FETs. Different circuits are selected by turning different optically isolated FETs on and off. For example, if optically isolated FET1+ and optically isolated FET2- are turned on, path 1 is connected to the first positive bus and path 2 is connected to the first negative bus. If optically isolated FET1- and optically isolated FET2+ are turned on, path 1 is connected to the first negative bus and path 2 is connected to the first positive bus.

[0044] In one embodiment, see Figure 4 The switch matrix daughter board also includes an FPGA and a decoder. The optical isolation FET is driven by the decoder, and the FPGA provides a control signal to the decoder, so that the switch matrix daughter board selects the path to be tested from among the many paths.

[0045] The functional equivalent daughter board can simulate the satellite receiving wired commands and monitor the correctness of the commands, simulate the transmission of wired telemetry signals on the satellite, and monitor the power supply voltage of the array power supply or centralized power supply to detect whether the communication between the satellite and the ground equipment is normal.

[0046] In one specific embodiment, a functionally equivalent daughter board includes a second positive bus, a second negative bus, and M mutually exclusive equivalent modules. M Class II positive terminals are provided on the positive optical isolation circuit. These M Class II positive terminals are connected via the second positive bus and electrically connected to the board output positive terminal of the switch matrix daughter board. M Class II negative terminals are provided on the negative optical isolation circuit. These M Class II negative terminals are connected via the second negative bus and electrically connected to the board output negative terminal of the switch matrix daughter board. The M Class II positive terminals correspond one-to-one to the M Class II negative terminals.

[0047] An optical isolation FETj+, an optical isolation FETj- and a j-th equivalent module are arranged between the j-th Class-II positive terminal (1≤j≤M) and the j-th Class-II negative terminal, wherein the first end of the optical isolation FETj+ is electrically connected to the j-th Class-II positive terminal, the second end of the optical isolation FETj+ is electrically connected to the first end of the j-th equivalent module, the second end of the j-th equivalent module is electrically connected to the first end of the optical isolation FETj-, and the second end of the optical isolation FETj- is electrically connected to the j-th Class-II negative terminal.

[0048] See Figure 5 The M equivalent modules of the functional equivalent daughter board may include a power supply / 28V instruction equivalent module, an analog equivalent module, a passive instruction equivalent module, and a passive state equivalent module.

[0049] The positive terminal of the power supply / 28V command equivalent module is connected to the optical isolation FETA+, and the other terminal of the optical isolation FETA+ is connected to the second positive terminal bus of the functional equivalent daughter board. The negative terminal of the power supply / 28V command equivalent module is connected to the optical isolation FETA-, and the other terminal of the optical isolation FETA- is connected to the second negative terminal bus of the functional equivalent daughter board.

[0050] The positive end of the analog equivalent module is connected to the optical isolation FETB+, and the other end of the optical isolation FETB+ is connected to the second positive end bus of the functional equivalent daughter board. The negative end of the analog equivalent module is connected to the optical isolation FETB-, and the other end of the optical isolation FETB- is connected to the second negative end bus of the functional equivalent daughter board.

[0051] The positive end of the passive instruction equivalent module is connected to the optical isolation FETC+, and the other end of the optical isolation FETC+ is connected to the second positive end bus of the functional equivalent daughter board. The negative end of the passive instruction equivalent module is connected to the optical isolation FETC-, and the other end of the optical isolation FETC- is connected to the second negative end bus of the functional equivalent daughter board.

[0052] The positive end of the passive state equivalent module is connected to the optical isolation FETD+, and the other end of the optical isolation FETB+ is connected to the second positive end bus of the functional equivalent daughter board. The negative end of the passive state equivalent module is connected to the optical isolation FETD-, and the other end of the optical isolation FETD- is connected to the second negative end bus of the functional equivalent daughter board.

[0053] The second positive bus of the functionally equivalent daughter board is connected to the first positive bus of the switch matrix daughter board through the motherboard, and the second negative bus of the functionally equivalent daughter board is connected to the first negative bus of the switch matrix daughter board through the motherboard. Different circuits are selected by controlling the conduction and shutdown of different optical isolation FETs.

[0054] For the switch matrix sub-board, when the power supply and distribution ground equipment is connected to the ath path terminal and the bth path terminal of the switch matrix sub-board (1≤a≤N, 1≤b≤N, a≠b), if the optical isolation FETa+ and the optical isolation FETb- are controlled to be turned on, the ground power supply and distribution test equipment is connected to the first positive end bus through the ath path terminal, and then connected to the second positive end bus of the functionally equivalent sub-board, and the ground power supply and distribution test equipment is connected to the first negative end bus through the bth path terminal, and then connected to the second negative end bus of the functionally equivalent sub-board.

[0055] For the functional equivalent sub-board, if the optical isolation FETc+ and the optical isolation FETc- are controlled to be turned on (1≤c≤M), the ground power supply and distribution test equipment is connected to the cth equivalent module of the functional equivalent sub-board through the switch matrix sub-board.

[0056] When verifying the power supply and distribution ground equipment, the industrial computer generates control instructions through the LCD screen or external equipment, and transmits the instructions to the single-chip microcomputer on the motherboard. After receiving the instructions, the single-chip microcomputer on the motherboard generates path selection instructions and function selection instructions, and sends the path selection instructions to the FPGA of the switch matrix daughter board, and sends the function selection instructions to the FPGA of the functional equivalent daughter board; after the FPGA of the switch matrix daughter board receives the path selection instruction, it drives the decoder to turn on or off the corresponding optical isolation FET to realize the path selection function. After receiving the function selection instruction, the FPGA of the functional equivalent daughter board drives the optical isolation FET to turn on or off to select the corresponding equivalent module. The signal generated by the equivalent module is transmitted through the optical isolation FET corresponding to the equivalent module and the second positive terminal of the functional equivalent daughter board. The signal is transmitted to the power supply and distribution ground equipment through the line and the second negative bus, the motherboard, the first positive bus and the first negative bus of the switch matrix daughter board, the optical isolation FET turned on in the switch matrix daughter board, the electrical connector of the switch matrix daughter board, the universal separation plug adapter cable and the star-rocket cable, and judged whether the power supply and distribution ground equipment is normal according to the status of the power supply and distribution ground equipment; similarly, the signal generated by the power supply and distribution ground equipment is sent to the corresponding functional equivalent daughter board through the star-rocket cable, the universal separation plug adapter cable, the electrical connector of the switch matrix daughter board, the optical isolation FET turned on in the switch matrix daughter board, the first positive bus and the first negative bus of the switch matrix daughter board, the motherboard, the second positive bus and the second negative bus of the functional equivalent daughter board, and the functional equivalent daughter board judges whether the power supply and distribution ground equipment is working normally according to the received signal.

[0057] The following uses a typical business scenario as an example to illustrate the analog function of the satellite. The positive point of the loop is 6 and the negative point is 4:

[0058] 1. The industrial computer generates the "analog equivalent (+6, -4)" instruction through the LCD screen or external device, and transmits the instruction to the microcontroller on the motherboard;

[0059] 2. After receiving the "analog equivalent (+6, -4)" instruction, the MCU on the motherboard generates a path selection instruction "(+6, -4)" and a function selection instruction "analog equivalent". The path selection instruction "(+6, -4)" is sent to the FPGA of the switch matrix daughter board, and the function selection instruction "analog equivalent" is sent to the FPGA of the functional equivalent daughter board.

[0060] 3. After receiving the path selection instruction "(+6, -4)", the FPGA of the switch matrix daughter board drives the decoder to turn on the optical isolation FET6+ and the optical isolation FET4-, and disconnect the other optical isolation FETs, so that point 6 of the electrical connector is connected to the first positive terminal bus of the switch matrix daughter board, and point 4 of the electrical connector is connected to the first negative terminal bus of the switch matrix daughter board, thereby realizing the path selection function;

[0061] 4. After receiving the function selection instruction "analog equivalent", the FPGA of the functional equivalent daughter board turns on the optical isolation FET B+ and the optical isolation FET B-, disconnects the other optical isolation FETs, and connects the analog equivalent module to the second positive terminal bus and the second negative terminal bus of the functional equivalent daughter board;

[0062] 5. The signal generated by the analog equivalent module is transmitted to the power supply and distribution ground equipment through the optical isolation FETB+ and optical isolation FETB- of the functional equivalent daughter board, the second positive terminal bus and the second negative terminal bus of the functional equivalent daughter board, the motherboard, the first positive terminal bus and the first negative terminal bus of the switch matrix daughter board, the optical isolation FET6+ and optical isolation FET4- of the switch matrix daughter board, the switch matrix daughter board electrical connector, the universal separation plug adapter cable and the star-rocket cable. The power supply and distribution ground equipment is judged to be normal based on the status of the power supply and distribution ground equipment.

[0063] In a specific embodiment, the power supply board input is 220V AC, and the output is supplied to the motherboard through a connector, and the output includes 28V, 12V, 5V, 3.3V and other power sources.

[0064] Although the present invention is disclosed above in terms of preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims of the present invention.

Claims

1. A universal satellite power supply and distribution equivalent device, characterized in that: It includes a motherboard, a switch matrix daughter board, a functional equivalent daughter board, and a power supply sub-board; the switch matrix daughter board, the functional equivalent daughter board, and the power supply sub-board are all plugged into the motherboard; the power supply sub-board is used to supply power to the motherboard, and supply power to the switch matrix daughter board and the functional equivalent daughter board through the motherboard; The switch matrix daughter board includes a first positive bus and a first negative bus. The first positive bus of the switch matrix daughter board is connected to the second positive bus of the functional equivalent daughter board through the motherboard. The first negative bus of the switch matrix daughter board is connected to the second negative bus of the functional equivalent daughter board through the motherboard. The functional equivalent daughter board is used to simulate the satellite receiving wired commands and monitoring the correctness of the commands, simulate the transmission of wired telemetry signals on the satellite, and monitor the power supply voltage of the array power supply or the centralized power supply to detect whether the functional performance of the ground equipment is normal. N Class A positive terminals are provided on the positive optical isolation circuit, the N Class A positive terminals are connected via a first positive terminal bus, and are electrically connected to the card output positive terminal of the switch matrix daughter board; N Class A negative terminals are provided on the negative optical isolation circuit, the N Class A negative terminals are connected via a first negative terminal bus, and are electrically connected to the card output negative terminal of the switch matrix daughter board; the N Class A positive terminals correspond one to one with the N Class A negative terminals; An optical isolation FETi+ and an optical isolation FETi- are arranged between the i-th Class A positive terminal and the i-th Class A negative terminal, wherein the first end of the optical isolation FETi+ is electrically connected to the i-th Class A positive terminal, the second end of the optical isolation FETi+ is electrically connected to the first end of the optical isolation FETi-, and the second end of the optical isolation FETi- is electrically connected to the i-th Class A negative terminal; an i-th path terminal is drawn between the second end of the optical isolation FETi+ and the first end of the optical isolation FETi-, 1≤i≤N.

2. The power supply and distribution equivalent device according to claim 1, characterized in that: When the optical isolation FETa+ and the optical isolation FETb- are controlled to be turned on, 1≤a≤N, 1≤b≤N, a≠b, the ground power supply and distribution test equipment is connected to the first positive end bus through the ath Class A positive terminal, and then connected to the second positive end bus of the functional equivalent sub-board, and the ground power supply and distribution test equipment is connected to the first negative end bus through the bth Class A negative terminal, and then connected to the second negative end bus of the functional equivalent sub-board, so that the power supply and distribution ground equipment is connected to the equivalent module of the functional equivalent sub-board through the ath path terminal and the bth path terminal of the switch matrix sub-board.

3. The power supply and distribution equivalent device according to claim 2, characterized in that: The power supply and distribution equivalent device also includes an industrial computer, which is used to control the conduction state of the switch matrix sub-board.

4. The power supply and distribution equivalent device according to claim 2 or 3, characterized in that: The switch matrix daughter board also includes an FPGA and a decoder. The optical isolation FET is driven by the decoder, and the FPGA provides a control signal for the decoder.

5. The power supply and distribution equivalent device according to claim 1, characterized in that: The functional equivalent daughter board includes a second positive terminal bus, a second negative terminal bus, and M mutually different equivalent modules; M Class II positive terminal terminals are provided on the positive optical isolation circuit, the M Class II positive terminal terminals are connected via the second positive terminal bus, and are electrically connected to the board card output positive terminal of the switch matrix daughter board; M Class II negative terminal terminals are provided on the negative optical isolation circuit, the M Class II negative terminal terminals are connected via the second negative terminal bus, and are electrically connected to the board card output negative terminal of the switch matrix daughter board; the M Class II positive terminal terminals correspond one-to-one to the M Class II negative terminal terminals; An optical isolation FETj+, an optical isolation FETj- and a j-th equivalent module are arranged between the j-th Class-II positive terminal and the j-th Class-II negative terminal, wherein the first end of the optical isolation FETj+ is electrically connected to the j-th Class-II positive terminal, the second end of the optical isolation FETj+ is electrically connected to the first end of the j-th equivalent module, the second end of the j-th equivalent module is electrically connected to the first end of the optical isolation FETj-, and the second end of the optical isolation FETj- is electrically connected to the j-th Class-II negative terminal, 1≤j≤M.

6. The power supply and distribution equivalent device according to claim 5, characterized in that: If the optical isolation FETc+ and the optical isolation FETc- are controlled to be turned on, 1≤c≤M, the ground power supply and distribution test equipment is connected to the cth equivalent module of the functional equivalent sub-board through the switch matrix sub-board.

7. The power supply and distribution equivalent device according to claim 5 or 6, characterized in that: The M equivalent modules of the functional equivalent daughter board include a power supply / 28V instruction equivalent module, an analog equivalent module, a passive instruction equivalent module, and a passive state equivalent module; The positive terminal of the power supply / 28V instruction equivalent module is connected to the optical isolation FETA+, and the other terminal of the optical isolation FETA+ is connected to the second positive terminal bus of the functional equivalent daughter board. The negative terminal of the power supply / 28V instruction equivalent module is connected to the optical isolation FETA-, and the other terminal of the optical isolation FETA- is connected to the second negative terminal bus of the functional equivalent daughter board. The positive end of the analog equivalent module is connected to the optical isolation FETB+, and the other end of the optical isolation FETB+ is connected to the second positive end bus of the functional equivalent daughter board. The negative end of the analog equivalent module is connected to the optical isolation FETB-, and the other end of the optical isolation FETB- is connected to the second negative end bus of the functional equivalent daughter board. The positive end of the passive instruction equivalent module is connected to the optical isolation FETC+, and the other end of the optical isolation FETC+ is connected to the second positive end bus of the functional equivalent daughter board. The negative end of the passive instruction equivalent module is connected to the optical isolation FETC-, and the other end of the optical isolation FETC- is connected to the second negative end bus of the functional equivalent daughter board. The positive end of the passive state equivalent module is connected to the optical isolation FETD+, and the other end of the optical isolation FETB+ is connected to the second positive end bus of the functional equivalent daughter board. The negative end of the passive state equivalent module is connected to the optical isolation FETD-, and the other end of the optical isolation FETD- is connected to the second negative end bus of the functional equivalent daughter board.

8. The power supply and distribution equivalent device according to claim 1, characterized in that: The power supply and distribution equivalent device also includes a liquid crystal screen and an industrial computer; When verifying the power supply and distribution ground equipment, the industrial computer generates control instructions through the LCD screen or external devices and transmits the instructions to the microcontroller on the motherboard; After receiving the instruction, the MCU on the motherboard generates a path selection instruction and a function selection instruction, and sends the path selection instruction to the FPGA of the switch matrix daughter board and sends the function selection instruction to the FPGA of the functionally equivalent daughter board; After receiving the path selection instruction, the FPGA of the switch matrix daughter board drives the decoder to turn on or off the corresponding optical isolation FET to realize the path selection function; After receiving the function selection instruction, the FPGA of the functional equivalent daughter board drives the optical isolation FET to be turned on or off to select the corresponding equivalent module.

9. The power supply and distribution equivalent device according to claim 8, characterized in that: The signal generated by the equivalent module is transmitted to the power supply and distribution ground equipment through the optical isolation FET corresponding to the equivalent module, the second positive bus and the second negative bus of the functional equivalent sub-board, the motherboard, the first positive bus and the first negative bus of the switch matrix sub-board, the optical isolation FET that is turned on in the switch matrix sub-board, and the terminal of the switch matrix sub-board. The power supply and distribution ground equipment is judged whether it is normal based on the status of the power supply and distribution ground equipment.

10. The power supply and distribution equivalent device according to claim 8, characterized in that: The signal generated by the power supply and distribution ground equipment is sent to the corresponding equivalent module through the terminals of the switch matrix sub-board, the optical isolation FET turned on by the switch matrix sub-board, the first positive bus and the first negative bus of the switch matrix sub-board, the motherboard, the second positive bus and the second negative bus of the functional equivalent sub-board. The equivalent module determines whether the power supply and distribution ground equipment is working normally based on the received signal.

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