Universal power supply and distribution equivalent device for satellites

Abstract

The invention discloses a universal power supply and distribution equivalent device for satellites. When power supply and distribution ground equipment is verified, the industrial personal computer generates a control instruction through a liquid crystal screen or an external device and transmits the instruction to the single-chip microcomputer on the mother board, the single-chip microcomputer on the mother board receives the instruction and then generates an access selection instruction and a function selection instruction and sends the access selection instruction to the switch matrix daughter board, and the switch matrix daughter board sends the function selection instruction to the switch matrix daughter board. Sending the function selection instruction to the function equivalent daughter board; the switch matrix daughter board switches on or switches off the corresponding optical isolation FETs to realize the access selection function after receiving the access selection instruction, and the function equivalent daughter board drives the optical isolation FETs to switch on or switch off to select the corresponding equivalent modules after receiving the function selection instruction. Therefore, the functional equivalent daughter board can simulate a satellite to receive a wired instruction, monitor the correctness of the instruction, simulate the transmission of wired telemetry signals on the satellite, and monitor the power supply voltage of sub-array power supply or centralized power supply so as to detect whether the functional performance of ground equipment is normal or not.

Description

Technical Field

[0001] The present invention relates to the technical field of satellite power supply and distribution equivalent devices, in particular to a satellite universal 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 distribution of separate electrical connectors. Since the satellites currently under development have great differences in ground power supply, key wired instructions, and parameter measurement requirements, the traditional approach is to design a dedicated satellite equivalent for each satellite, which is not universal. One improvement is to develop a transfer cable from separate electrical connectors to satellite equivalents for satellites with different technical status, so as to achieve the purpose of reusing satellite equivalents, but each satellite with different technical status still needs to design a transfer cable, which increases the workload of designers, and the functions of existing equivalents cannot meet the needs of some newly developed satellites. Each model is equipped with its own satellite equivalent or corresponding transfer cable, which is inconvenient to store, manage, search and use, and causes 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, which realizes the universalization of the satellite power supply and distribution equivalent device through the application of a switch matrix, has strong expansibility, and meets the application requirements of the satellite power supply and distribution equivalent device.

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

[0007] The switch matrix sub-board includes a first positive end bus and a first negative end bus. The first positive end bus of the switch matrix sub-board is connected to the second positive end bus of the functional equivalent sub-board through the motherboard. The first negative end bus of the switch matrix sub-board is connected to the second negative end bus of the functional equivalent sub-board through the motherboard. The functional equivalent sub-board is used to simulate the satellite receiving wired instructions and monitor 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.

[0008] N first-class positive terminals are arranged on the positive optical isolation circuit, the N first-class positive terminals are connected through a first positive terminal bus, and are electrically connected to the board card output positive terminal of the switch matrix sub-board; N first-class negative terminals are arranged on the negative optical isolation circuit, the N first-class negative terminals are connected through a first negative terminal bus, and are electrically connected to the board card output negative terminal of the switch matrix sub-board; the N first-class positive terminals correspond to the N first-class negative terminals one by one;

[0009] An optical isolation FETi+ and an optical isolation FETi- are arranged between the i-th class-one positive terminal and the i-th class-one negative terminal, wherein the first end of the optical isolation FETi+ is electrically connected to the i-th class-one 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-one negative terminal; an i-th passage terminal is led out 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, then the ground power supply and distribution test equipment is connected to the first positive terminal bus through the a-th class-one positive terminal, and then connected to the second positive terminal bus of the functionally equivalent sub-board, and the ground power supply and distribution test equipment is connected to the first negative terminal bus through the b-th class-one negative terminal, and then connected to the second negative terminal 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 a-th passage terminal and the b-th passage 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 also includes an industrial computer, and the industrial computer 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 sub-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 combination with the first aspect, in some implementations of the first aspect, the functional equivalent daughter board includes a second positive terminal bus, a second negative terminal bus, and M equivalent modules that are different from each other; M second-class positive terminal terminals are provided on the positive optical isolation circuit, the M second-class positive terminal terminals are connected through the second positive terminal bus, and are electrically connected to the board card output positive terminal of the switch matrix daughter board; M second-class negative terminal terminals are provided on the negative optical isolation circuit, the M second-class negative terminal terminals are connected through the second negative terminal bus, and are electrically connected to the board card output negative terminal of the switch matrix daughter board; the M second-class positive terminal terminals correspond one-to-one to the M second-class negative terminal terminals;

[0014] An optical isolation FETj+, an optical isolation FETj- and a jth equivalent module are arranged between the jth Class-II positive terminal and the jth Class-II negative terminal, wherein the first end of the optical isolation FETj+ is electrically connected to the jth Class-II positive terminal, the second end of the optical isolation FETj+ is electrically connected to the first end of the jth equivalent module, the second end of the jth 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 jth 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 combination with the first aspect, in certain implementations of the first aspect, the M equivalent modules of the functionally equivalent sub-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 end of the power supply / 28V instruction equivalent module is connected to the optical isolation FETA+, and the other end of the optical isolation FETA+ is connected to the second positive end bus of the functional equivalent daughter board. The negative end of the power supply / 28V instruction equivalent module is connected to the optical isolation FETA-, and the other end of the optical isolation FETA- is connected to the second negative end 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 some 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 ground equipment for power supply and distribution, 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 single-chip microcomputer 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 functional 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 via 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 turned on by the switch matrix sub-board, and the terminals 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 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 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, and the ground power supply and distribution equipment verification is no longer restricted by the contact allocation of the separate electrical connector. 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 combination of a switch matrix sub-board and 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 a new function that needs to be simulated, a new functional daughterboard is added and plugged into the motherboard to complete the transformation and upgrading of the equivalent device. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0035] Figure 4 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 is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] See also 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 separation plug can be a YF8-64Z electrical connector, connected to the separation plug of the star-rocket cable, and the other end can be a J14-74TK electrical connector, connected to the terminal of the switch matrix daughter board. The LCD screen is fixed to the front side of the chassis and connected to the industrial computer. The industrial computer is fixed to the back of 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 through the LAN interface. 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 power the motherboard, and power the switch matrix daughter board and the functional equivalent daughter board through the motherboard. The switch matrix daughter board and the functional equivalent daughter board exchange information through the motherboard.

[0041] In a specific embodiment, the switch matrix sub-board includes a first positive terminal bus and a first negative terminal bus. N first-class positive terminals are provided on the positive optical isolation circuit, the N first-class positive terminals are connected through the first positive terminal bus, and are electrically connected to the board card output positive terminal of the switch matrix sub-board. N first-class negative terminals are provided on the negative optical isolation circuit, the N first-class negative terminals are connected through the first negative terminal bus, and are electrically connected to the board card output negative terminal of the switch matrix sub-board. The N first-class positive terminals correspond to the N first-class negative terminals one by one.

[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, wherein 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 passage terminal is drawn between the optical isolation FETi+ and the optical isolation FETi-. That is, an i-th passage terminal is drawn between the second end of the optical isolation FETi+ and the first end of the optical isolation FETi-.

[0043] See also Figure 3 , the switch matrix sub-board is composed of optical isolation FETs to form a power circuit, with a total of 64 paths, each path is configured with 2 optical isolation FETs, and different circuits are selected by controlling the on and off of different optical isolation FETs. For example: when the optical isolation FET1+ and the optical isolation FET2- are turned on, path 1 is connected to the first positive bus, and path 2 is connected to the first negative bus; when the optical isolation FET1- and the optical isolation 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 specific 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 tested path from a large number of 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 a specific embodiment, the functional equivalent sub-board includes a second positive terminal bus, a second negative terminal bus and M equivalent modules that are different from each other. M second-class positive terminal terminals are arranged on the positive optical isolation circuit, and the M second-class positive terminal terminals are connected through the second positive terminal bus and electrically connected to the board card output positive terminal of the switch matrix sub-board. M second-class negative terminals are arranged on the negative optical isolation circuit, and the M second-class negative terminals are connected through the second negative terminal bus and electrically connected to the board card output negative terminal of the switch matrix sub-board. The M second-class positive terminal terminals correspond one-to-one to the M second-class negative terminals.

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

[0048] See also 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 end of the power supply / 28V instruction equivalent module is connected to the optical isolation FETA+, and the other end of the optical isolation FETA+ is connected to the second positive end bus of the functional equivalent daughter board. The negative end of the power supply / 28V instruction equivalent module is connected to the optical isolation FETA-, and the other end of the optical isolation FETA- is connected to the second negative end 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 functional equivalent daughter board is connected to the first positive bus of the switch matrix daughter board through the mother board, and the second negative bus of the functional equivalent daughter board is connected to the first negative bus of the switch matrix daughter board through the mother board. Different loops are selected by controlling the on and off 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 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, and 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, and 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 line is transmitted to the power supply and distribution ground equipment through the second negative terminal bus, the motherboard, the first positive terminal bus and the first negative terminal bus of the switch matrix sub-board, the optical isolation FET turned on in the switch matrix sub-board, the switch matrix sub-board electrical connector, the universal separation plug adapter cable and the star-rocket cable, and the power supply and distribution ground equipment is 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 sub-board through the star-rocket cable, the universal separation plug adapter cable, the switch matrix sub-board electrical connector, the optical isolation FET turned on in the switch matrix sub-board, the first positive terminal bus and the first negative terminal bus of the switch matrix sub-board, the motherboard, the second positive terminal bus and the second negative terminal bus of the functional equivalent sub-board, and the functional equivalent sub-board judges whether the power supply and distribution ground equipment is working normally according to the received signal.

[0057] The following is an example of a typical business scenario. The equivalent device simulates 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 single-chip microcomputer on the motherboard generates a path selection instruction "(+6, -4)" and a function selection instruction "analog equivalent", and sends the path selection instruction "(+6, -4)" to the FPGA of the switch matrix daughter board, and sends the function selection instruction "analog equivalent" 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 the point 6 of the electrical connector is connected to the first positive end bus of the switch matrix daughter board, and the point 4 of the electrical connector is connected to the first negative end bus of the switch matrix daughter board to realize 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 FETB+ and the optical isolation FETB-, 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 the 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 whether it is normal according to 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 as above in the form of a preferred embodiment, 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 daughter board; the switch matrix daughter board, the functional equivalent daughter board, and the power supply daughter board are all plugged into the motherboard; the power supply daughter 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 sub-board includes a first positive end bus and a first negative end bus. The first positive end bus of the switch matrix sub-board is connected to the second positive end bus of the functional equivalent sub-board through the motherboard. The first negative end bus of the switch matrix sub-board is connected to the second negative end bus of the functional equivalent sub-board through the motherboard. The functional equivalent sub-board is used to simulate the satellite receiving wired instructions and monitor 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. N first-class positive terminals are arranged on the positive optical isolation circuit, the N first-class positive terminals are connected through a first positive terminal bus, and are electrically connected to the board card output positive terminal of the switch matrix sub-board; N first-class negative terminals are arranged on the negative optical isolation circuit, the N first-class negative terminals are connected through a first negative terminal bus, and are electrically connected to the board card output negative terminal of the switch matrix sub-board; the N first-class positive terminals correspond to the N first-class negative terminals one by one; An optical isolation FETi+ and an optical isolation FETi- are arranged between the i-th class-one positive terminal and the i-th class-one negative terminal, wherein the first end of the optical isolation FETi+ is electrically connected to the i-th class-one 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-one negative terminal; an i-th passage terminal is led out 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 bus through the ath class-one positive terminal, and then connected to the second positive bus of the functionally equivalent sub-board, and the ground power supply and distribution test equipment is connected to the first negative bus through the bth class-one negative terminal, and then connected to the second negative 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 channel terminal and the bth channel 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 sub-board includes a second positive terminal bus, a second negative terminal bus and M equivalent modules that are different from each other; M second-class positive terminal terminals are arranged on the positive optical isolation circuit, the M second-class positive terminal terminals are connected through the second positive terminal bus, and are electrically connected to the board card output positive terminal of the switch matrix sub-board; M second-class negative terminal terminals are arranged on the negative optical isolation circuit, the M second-class negative terminal terminals are connected through the second negative terminal bus, and are electrically connected to the board card output negative terminal of the switch matrix sub-board; the M second-class positive terminal terminals correspond to the M second-class negative terminal terminals one by one; An optical isolation FETj+, an optical isolation FETj- and a jth equivalent module are arranged between the jth Class-II positive terminal and the jth Class-II negative terminal, wherein the first end of the optical isolation FETj+ is electrically connected to the jth Class-II positive terminal, the second end of the optical isolation FETj+ is electrically connected to the first end of the jth equivalent module, the second end of the jth 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 jth 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 sub-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 end of the power supply / 28V instruction equivalent module is connected to the optical isolation FETA+, and the other end of the optical isolation FETA+ is connected to the second positive end bus of the functional equivalent daughter board. The negative end of the power supply / 28V instruction equivalent module is connected to the optical isolation FETA-, and the other end of the optical isolation FETA- is connected to the second negative end 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 ground equipment for power supply and distribution, 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 single-chip microcomputer 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 functional 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 on the switch matrix sub-board, and the terminals of the switch matrix sub-board. Whether the power supply and distribution ground equipment is normal is judged 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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