A test board and a test method for a power supply board of a flight management navigation computer

Abstract

The present invention discloses a test board and a test method for a power supply board of a flight management navigation computer. The test board is provided with a control terminal interface module, an eight-way power detection module, a five-way analog load module, a test terminal interface module, a three-way overvoltage module, a bidirectional level conversion module, and a card identification module. Through steps S1 to S6, it can perform single-board testing on the power supply board of the flight management navigation computer, including power failure detection, overvoltage detection, and input / output terminal failure detection respectively carried out in two states of connecting and disconnecting power resistance loads at five power supply terminals of the power supply board of the flight management navigation computer. Moreover, in step S4, the voltage ripple of eight power supply terminals of the power supply board of the flight management navigation computer is detected by an oscilloscope. Therefore, the present invention can completely simulate the load of the power supply board of the flight management navigation computer and conduct comprehensive functional testing, and can effectively detect the latent faults of the power supply board of the flight management navigation computer.

Description

Technical Field

[0001] The present invention relates to a test device for aircraft equipment, specifically a test board card and a test method for a power supply board of a flight management navigation computer. Background Art

[0002] The FMGC (PN: C13042BA08 / C13043AB08) is an automatic flight system (AFS) applicable to the electronic bays of Airbus single-aisle (A319 / A320 / A321 series) aircraft. Its main functions are to provide flight guidance, automatic flight, and automatic thrust flight navigation functions, as well as flight management functions for lateral navigation, longitudinal navigation, and performance, the pitch and roll axes of the electronic flight control system EFCS, the yaw axis of the flight augmentation computer FAC, and the start of the full-authority digital electronic control FADEC, etc. It is an important control computer for aircraft flight. The extremely important flight management navigation computer power supply board FMGC_PSU (PN: U489AAM01 / U489ABM02) in this control computer is extremely prone to failures, and there are often latent unstable failures, which can cause component failures and have a major safety impact on the aircraft. Moreover, the existing ATEC6 series test benches can only test the entire control computer FMGC, and do not perform single-board testing on this flight management navigation computer power supply board, nor do they conduct single-board simulated load testing and voltage ripple detection, resulting in the inability to detect latent failures. Summary of the Invention

[0003] One of the technical problems to be solved by the present invention is to provide a test board card for a flight management navigation computer power supply board.

[0004] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0005] A test board card for a flight management navigation computer power supply board, used for testing the flight management navigation computer power supply board, i.e., FMGC_PSU, is characterized by comprising: a control end interface module, an eight-way power detection module, a five-way analog load module, and a test end interface module;

[0006] The eight-way power supply detection module can receive a power supply detection instruction sent by an external ARM processor through the control terminal interface module, and sample any one of the eight power supply terminals of the power supply board of the flight management navigation computer under test according to the power supply detection instruction through the test terminal interface module, and send the sampled voltage signal to the ARM processor through the control terminal interface module; among them, the eight power supply terminals are 3V_SD power supply terminal, 28VF power supply terminal, +15VUUT power supply terminal, +5VUUT power supply terminal, +5V_SW power supply terminal, +5V_SD power supply terminal, +5VS power supply terminal, -15VUUT power supply terminal;

[0007] The five-way analog load module can receive an analog load instruction sent by an FPGA controller through the control terminal interface module, and connect or disconnect a corresponding power resistor load to the five power supply terminals of the power supply board of the flight management navigation computer under test through the test terminal interface module according to the analog load instruction, so that the five power supply terminals work at their maximum operating current when the corresponding power resistor loads are connected; among them, the five power supply terminals are 3V_SD power supply terminal, +15VUUT power supply terminal, +5VUUT power supply terminal, +5V_SW power supply terminal, -15VUUT power supply terminal;

[0008] Moreover, the test terminal interface module is provided with eight wiring terminals for electrically connecting an external oscilloscope to the eight power supply terminals.

[0009] Among them, the ARM processor preferably uses ST (STMicroelectronics) to be a high-performance microcontroller of the STM32F4 series based on Cortex TM -M4 core.

[0010] Preferably: as Figure 2 shown, the control terminal interface module includes a power supply detection instruction input interface and a sampled voltage signal output port, and the eight-way power supply detection module includes a multiplexer switch chip of model DG528 and an eight-way voltage dividing circuit; the control terminal of the multiplexer switch chip is connected to the IO control port of the ARM processor through the power supply detection instruction input interface to receive the power supply detection instruction; the eight input terminals of the multiplexer switch chip are respectively connected to the eight power supply terminals of the power supply board of the flight management navigation computer under test through the eight-way voltage dividing circuit and the test terminal interface module, and the eight-way voltage dividing circuit is used to step down the voltages of the eight power supply terminals to below the maximum input voltage of the multiplexer switch chip; the output terminal of the multiplexer switch chip is connected to the analog-to-digital converter input port of the ARM processor through the sampled voltage signal output port to output the sampled voltage signal.

[0011] As a preferred embodiment of the present invention: the test board further includes a three-way overvoltage module;

[0012] The three-way overvoltage module can access, through the control terminal interface module, three-way overvoltage voltages provided by an external adjustable power supply and corresponding to three power supply terminals of the power supply board of the flight management and navigation computer under test. Among them, the three power supply terminals are the +15VUUT power supply terminal, the +5VUUT power supply terminal, and the -15VUUT power supply terminal respectively. Each three-way overvoltage voltage exceeds the rated working voltage of its corresponding power supply terminal. For example, the overvoltage voltage corresponding to the +15VUUT power supply terminal can be set to +17V, and the overvoltage voltage corresponding to the -15VUUT power supply terminal can be set to -17V; and the three-way overvoltage module can receive, through the control terminal interface module, an overvoltage test instruction sent by an external FPGA controller, and apply any one of the overvoltage voltages to the corresponding power supply terminal of the power supply board of the flight management and navigation computer under test through the test terminal interface module according to the overvoltage test instruction.

[0013] Preferably: the three-way overvoltage module includes three relays. The input ends of the three relays access the three-way overvoltage voltage through the control terminal interface module. The output ends of the three relays are connected to the three power supply terminals of the power supply board of the flight management and navigation computer under test through the test terminal interface module. The control ends of the three relays receive the overvoltage test instruction through the control terminal interface module to realize the application and disconnection of the three-way overvoltage voltage by controlling the on and off of the three relays.

[0014] Among them, the adjustable power supply can provide the three-way overvoltage voltage through a DC-DC boost module.

[0015] As a preferred embodiment of the present invention: the test board further includes a bidirectional level conversion module;

[0016] The bidirectional level conversion module can receive, through the control terminal interface module, an input / output detection instruction sent by an FPGA controller, and collect the level state of any input end or any output end of the power supply board of the flight management and navigation computer under test through the test terminal interface module according to the input / output detection instruction, and send the collected level state to the FPGA controller through the control terminal interface module.

[0017] Preferably: the bidirectional level conversion module uses a bidirectional level conversion chip with the model TXS0108.

[0018] As a preferred embodiment of the present invention: the test board further includes a board identification module;

[0019] The board identification module can receive the board identification instruction sent by the ARM processor through the control terminal interface module, and output the test board identification number stored in the board identification module to the ARM processor through the control terminal interface module according to the board identification instruction.

[0020] Preferably, the board identification module adopts two register chips of model 74HC165.

[0021] The second technical problem to be solved by the present invention is to provide a test method for a power supply board of a flight management and navigation computer.

[0022] To solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0023] A test method for a power supply board of a flight management and navigation computer, characterized by including:

[0024] Step S1: Connect the test board to an adjustable power supply, an ARM processor, an FPGA controller, the power supply board of the flight management and navigation computer to be tested, and an oscilloscope respectively;

[0025] Step S2: Send the board identification instruction to the test board, and determine whether the read test board identification number matches the power supply board of the flight management and navigation computer to be tested. If not, after replacing the test board that matches the power supply board of the flight management and navigation computer to be tested, repeat Step S1 and Step S2; thereby, it is possible to prevent the staff from using the wrong test board.

[0026] Step S3: By sending the analog load instruction to the test board, in two states of connecting the power resistance load and disconnecting the power resistance load to five power supply terminals of the power supply board of the flight management and navigation computer to be tested, perform the following steps S4 to S6;

[0027] Step S4: Perform power failure detection, including:

[0028] Send the power detection instruction to the test board;

[0029] If when sampling any one of the eight power supply terminals of the power supply board of the flight management and navigation computer to be tested, the ARM processor fails to receive the corresponding voltage signal, it is determined that there is a fault in the corresponding power supply terminal;

[0030] If the ARM processor can receive corresponding voltage signals when sampling the eight power supply terminals of the to-be-tested flight management navigation computer power supply board, the oscilloscope is used to detect the voltage ripple of the eight power supply terminals, and it is determined that the power supply terminals with voltage ripple within the preset fluctuation range (e.g., 10%) are fault-free, and the power supply terminals with voltage ripple outside the preset fluctuation range are determined to have faults;

[0031] Step S5: Perform overvoltage detection on each of the +15VUUT power supply terminal, +5VUUT power supply terminal, and -15VUUT power supply terminal, including:

[0032] By sending the overvoltage test instruction to the test board card, first apply the corresponding overvoltage to the corresponding power supply terminal, then disconnect the power supply terminal from the overvoltage, and then detect the voltage signal of the power supply terminal through the eight-way power supply detection module. If the detected voltage value is 0, it is determined that the overvoltage protection function of the to-be-tested flight management navigation computer power supply board corresponding to this power supply terminal is fault-free; otherwise, it is determined that the overvoltage protection function of the to-be-tested flight management navigation computer power supply board corresponding to this power supply terminal has a fault;

[0033] Step S6: Perform input / output terminal fault detection, including:

[0034] Send the input / output detection instruction to the test board card. If the FPGA controller can receive the level status of the corresponding input terminal or output terminal of the to-be-tested flight management navigation computer power supply board, it is determined that this input terminal or output terminal is fault-free; otherwise, it is determined that this input terminal or output terminal has a fault.

[0035] Therefore, the present invention uses a test board card provided with a control terminal interface module, an eight-way power supply detection module, a five-way analog load module, a test terminal interface module, a three-way overvoltage module, a bidirectional level conversion module, and a card identification module. Through steps S1 to S6, it can perform single-board testing on the flight management navigation computer power supply board, including power supply fault detection, overvoltage detection, and input / output terminal fault detection respectively carried out in two states of connecting a power resistor load to the five power supply terminals of the flight management navigation computer power supply board and disconnecting the power resistor load. And in step S4, the voltage ripple of the eight power supply terminals of the flight management navigation computer power supply board is detected by the oscilloscope. Therefore, the present invention can completely simulate the load of the flight management navigation computer power supply board and perform comprehensive functional testing, and can effectively detect the latent faults of the flight management navigation computer power supply board.

[0036] Preferably: The test method further includes:

[0037] Step S7: Output a test report through the PC side. The test report includes the test process data and results of steps S3 to S6.

[0038] Among them, for the automatic test program TPS that executes the test method of the present invention, it is preferably written using TESTSTAND software.

[0039] Among them, the ARM processor and FPGA controller of the present invention can utilize the resources and equipment of the avionics component board-level test system.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] The present invention uses a test board card provided with a control terminal interface module, an eight-way power detection module, a five-way analog load module, a test terminal interface module, a three-way overvoltage module, a bidirectional level conversion module, and a card identification module. Through steps S1 to S6, it can perform a single-board test on the power supply board of the flight management navigation computer, including power failure detection, overvoltage detection, and input / output terminal failure detection respectively carried out in two states of connecting a power resistor load to five power supply terminals of the power supply board of the flight management navigation computer and disconnecting the power resistor load. And in step S4, the voltage ripple of eight power supply terminals of the power supply board of the flight management navigation computer is detected by an oscilloscope. Therefore, the present invention can completely simulate the load of the power supply board of the flight management navigation computer and perform a comprehensive functional test, and can effectively detect the latent faults of the power supply board of the flight management navigation computer. Description of the Drawings

[0042] The following further describes the present invention in detail with reference to the drawings and specific embodiments:

[0043] Figure 1 is the circuit principle block diagram of the test board card of the present invention;

[0044] Figure 2 is the circuit principle block diagram of the eight-way power detection module in the present invention;

[0045] Figure 3 is the circuit principle block diagram of the five-way analog load module in the present invention;

[0046] Figure 4 is the circuit principle block diagram of the three-way overvoltage module in the present invention;

[0047] Figure 5 is the circuit principle block diagram of the bidirectional level conversion module in the present invention;

[0048] Figure 6 is the circuit principle block diagram of the board card identification module in the present invention. Detailed Embodiments

[0049] The present invention will be described in detail below in conjunction with the embodiments and their accompanying drawings to help those skilled in the art better understand the inventive concept of the present invention. However, the protection scope of the claims of the present invention is not limited to the following embodiments. For those skilled in the art, all other embodiments obtained without creative labor on the premise of not departing from the inventive concept of the present invention belong to the protection scope of the present invention.

[0050] As Figures 1 to 6 shown, the present invention discloses a test board card for a flight management navigation computer power supply board, which is used to test the flight management navigation computer power supply board, i.e., FMGC_PSU, and includes: a control terminal interface module, an eight-way power detection module, a five-way analog load module, and a test terminal interface module;

[0051] The eight-way power detection module can receive a power detection instruction sent by an external ARM processor through the control terminal interface module, and based on this power detection instruction, sample any one of the eight power terminals of the flight management navigation computer power supply board to be tested through the test terminal interface module, and send the sampled voltage signal to the ARM processor through the control terminal interface module; wherein, the eight power terminals are respectively 3V_SD power terminal, 28VF power terminal, +15VUUT power terminal, +5VUUT power terminal, +5V_SW power terminal, +5V_SD power terminal, +5VS power terminal, -15VUUT power terminal;

[0052] The five-way analog load module can receive an analog load instruction sent by an FPGA controller through the control terminal interface module, and based on this analog load instruction, connect or disconnect corresponding power resistance loads to the five power terminals of the flight management navigation computer power supply board to be tested through the test terminal interface module, so that the five power terminals work at their maximum working currents when the corresponding power resistance loads are connected; wherein, the five power terminals are respectively 3V_SD power terminal, +15VUUT power terminal, +5VUUT power terminal, +5V_SW power terminal, -15VUUT power terminal;

[0053] Moreover, the test terminal interface module is provided with eight wiring terminals for electrically connecting an external oscilloscope to the eight power terminals.

[0054] Among them, the ARM processor preferably adopts ST (STMicroelectronics) and is a high-performance microcontroller of the STM32F4 series based on the Cortex TM -M4 core.

[0055] The above is the basic implementation manner of the present invention, and further optimization, improvement, and limitation can be made on the basis of this basic implementation manner:

[0056] Preferably, as Figure 2 shown, the control terminal interface module includes a power detection instruction input interface and a sampled voltage signal output port, and the eight-channel power detection module includes a multiplexer switch chip of model DG528 and an eight-channel voltage dividing circuit; the control terminal of the multiplexer switch chip is connected to the IO control port of the ARM processor through the power detection instruction input interface to receive the power detection instruction; the eight input terminals of the multiplexer switch chip are respectively connected to the eight power supply terminals of the to-be-tested flight management navigation computer power supply board through the eight-channel voltage dividing circuit and the test terminal interface module, and the eight-channel voltage dividing circuit is used to step down the voltages of the eight power supply terminals to below the maximum input voltage of the multiplexer switch chip; the output terminal of the multiplexer switch chip is connected to the analog-to-digital converter input port of the ARM processor through the sampled voltage signal output port to output the sampled voltage signal.

[0057] As a preferred embodiment of the present invention: the test board further includes a three-channel overvoltage module;

[0058] The three-channel overvoltage module can access, through the control terminal interface module, three-channel overvoltage voltages provided by an external adjustable power supply and corresponding to three power supply terminals of the to-be-tested flight management navigation computer power supply board, wherein the three power supply terminals are respectively the +15VUUT power supply terminal, the +5VUUT power supply terminal, and the -15VUUT power supply terminal, and each channel of overvoltage voltage exceeds the rated working voltage of its corresponding power supply terminal. For example, the overvoltage voltage corresponding to the +15VUUT power supply terminal can be set to +17V, and the overvoltage voltage corresponding to the -15VUUT power supply terminal can be set to -17V; and the three-channel overvoltage module can receive, through the control terminal interface module, an overvoltage test instruction sent by an external FPGA controller, and apply any one of the overvoltage voltages to the corresponding power supply terminal of the to-be-tested flight management navigation computer power supply board through the test terminal interface module according to the overvoltage test instruction.

[0059] Preferably, the three-channel overvoltage module includes three relays. The input terminals of the three relays access the three-channel overvoltage voltages through the control terminal interface module, the output terminals of the three relays are connected to the three power supply terminals of the to-be-tested flight management navigation computer power supply board through the test terminal interface module, and the control terminals of the three relays receive the overvoltage test instruction through the control terminal interface module to realize the application and disconnection of the three-channel overvoltage voltages by controlling the on-off of the three relays.

[0060] Among them, the adjustable power supply can provide the three-channel overvoltage voltages through a DC-DC boost module.

[0061] As a preferred embodiment of the present invention: the test board further includes a bidirectional level conversion module;

[0062] The two-way level conversion module can receive the input / output detection instruction sent by the FPGA controller through the control terminal interface module, and collect the level state of any input terminal or any output terminal of the power supply board of the flight management navigation computer under test according to the input / output detection instruction through the test terminal interface module, and send the collected level state to the FPGA controller through the control terminal interface module.

[0063] Preferably: The two-way level conversion module uses a two-way level conversion chip with the model number TXS0108.

[0064] As a preferred implementation manner of the present invention: The test board further includes a board identification module;

[0065] The board identification module can receive the board identification instruction sent by the ARM processor through the control terminal interface module, and output the test board identification number stored in the board identification module to the ARM processor through the control terminal interface module according to the board identification instruction.

[0066] Preferably: The board identification module uses two register chips with the model number 74HC165.

[0067] The present invention also discloses a test method for the power supply board of a flight management navigation computer, including:

[0068] Step S1, connect the test board to an adjustable power supply, an ARM processor, an FPGA controller, the power supply board of the flight management navigation computer under test, and an oscilloscope respectively;

[0069] Step S2, send the board identification instruction to the test board, and determine whether the read test board identification number matches the power supply board of the flight management navigation computer under test. If not, after replacing the test board that matches the power supply board of the flight management navigation computer under test, repeat Step S1 and Step S2; thereby, it can prevent the staff from using the wrong test board.

[0070] Step S3, by sending the analog load instruction to the test board, in the two states of connecting the power resistor load and disconnecting the power resistor load to five power supply terminals of the power supply board of the flight management navigation computer under test, perform the following steps S4 to S6;

[0071] Step S4, perform power failure detection, including:

[0072] Send the power detection instruction to the test board;

[0073] When sampling any one of the eight power supply terminals of the to-be-tested flight management navigation computer power supply board, if the ARM processor fails to receive the corresponding voltage signal, it is determined that there is a fault in the corresponding power supply terminal;

[0074] When the ARM processor can receive the corresponding voltage signals during sampling of the eight power supply terminals of the to-be-tested flight management navigation computer power supply board, the voltage ripple of the eight power supply terminals is detected by the oscilloscope, and it is determined that the power supply terminals with voltage ripple within the preset fluctuation range (for example, 10%) are free of faults, and it is determined that the power supply terminals with voltage ripple outside the preset fluctuation range have faults;

[0075] Step S5: Perform overvoltage detection on each of the +15VUUT power supply terminal, +5VUUT power supply terminal, and -15VUUT power supply terminal, including:

[0076] By sending the overvoltage test instruction to the test board card, first apply the corresponding overvoltage to the corresponding power supply terminal, then disconnect the power supply terminal from the overvoltage, and then detect the voltage signal of the power supply terminal through the eight-way power supply detection module. If the detected voltage value is 0, it is determined that the overvoltage protection function of the to-be-tested flight management navigation computer power supply board corresponding to this power supply terminal is free of faults; otherwise, it is determined that the overvoltage protection function of the to-be-tested flight management navigation computer power supply board corresponding to this power supply terminal has faults;

[0077] Step S6: Perform input / output terminal fault detection, including:

[0078] Send the input / output detection instruction to the test board card. If the FPGA controller can receive the level state of the corresponding input terminal or the corresponding output terminal of the to-be-tested flight management navigation computer power supply board, it is determined that this input terminal or output terminal is free of faults; otherwise, it is determined that this input terminal or output terminal has faults.

[0079] Therefore, the present invention adopts a test board card provided with a control terminal interface module, an eight-way power supply detection module, a five-way analog load module, a test terminal interface module, a three-way overvoltage module, a bidirectional level conversion module, and a card identification module. Through steps S1 to S6, it can perform single-board testing on the flight management navigation computer power supply board, including power supply fault detection, overvoltage detection, and input / output terminal fault detection respectively carried out in two states of connecting a power resistor load to the five power supply terminals of the flight management navigation computer power supply board and disconnecting the power resistor load. And in step S4, the voltage ripple of the eight power supply terminals of the flight management navigation computer power supply board is detected by the oscilloscope. Therefore, the present invention can completely simulate the load of the flight management navigation computer power supply board and perform comprehensive function testing, and can effectively detect the latent faults of the flight management navigation computer power supply board.

[0080] Preferably, the test method further includes:

[0081] Step S7, output a test report through the PC side, and the test report includes the test process data and results of steps S3 to S6.

[0082] Among them, the automatic test program TPS for executing the test method of the present invention is preferably written using TESTSTAND software.

[0083] Among them, the ARM processor and FPGA controller of the present invention can utilize the resources and equipment of the avionics component board-level test system.

[0084] The present invention is not limited to the above specific embodiments. Based on the above content, according to the common technical knowledge and conventional means in the art, without departing from the above basic technical idea of the present invention, the present invention can also make various other forms of equivalent modifications, substitutions or changes, all of which fall within the protection scope of the present invention.

Claims

1. A test board for a power supply board of a flight management navigation computer, used to test the power supply board of the flight management navigation computer, characterized in that Including: A control terminal interface module, an eight-channel power detection module, a five-channel analog load module, and a test terminal interface module; The eight-channel power detection module can receive a power detection instruction sent by an external ARM processor through the control terminal interface module, and sample any one of the eight power terminals of the power board of the flight management navigation computer under test according to the power detection instruction through the test terminal interface module, and send the sampled voltage signal to the ARM processor through the control terminal interface module; among them, the eight power terminals are 3V_SD power terminal, 28VF power terminal, +15VUUT power terminal, +5VUUT power terminal, +5V_SW power terminal, +5V_SD power terminal, +5VS power terminal, -15VUUT power terminal; The five-channel analog load module can receive an analog load instruction sent by an FPGA controller through the control terminal interface module, and connect or disconnect corresponding power resistance loads to five power terminals of the power board of the flight management navigation computer under test according to the analog load instruction through the test terminal interface module, so that the five power terminals work at their maximum working currents when the corresponding power resistance loads are connected; among them, the five power terminals are 3V_SD power terminal, +15VUUT power terminal, +5VUUT power terminal, +5V_SW power terminal, -15VUUT power terminal; And, the test terminal interface module is provided with eight wiring terminals for electrically connecting an external oscilloscope to the eight power terminals.

2. The test board of the flight management navigation computer power supply board according to claim 1, characterized in that: The control terminal interface module includes a power detection instruction input interface and a sampled voltage signal output port, and the eight-channel power detection module includes a multiplexer switch chip of model DG528 and an eight-channel voltage dividing circuit; the control terminal of the multiplexer switch chip is connected to the IO control port of the ARM processor through the power detection instruction input interface to receive the power detection instruction; the eight input terminals of the multiplexer switch chip are respectively connected to the eight power terminals of the power board of the flight management navigation computer under test through the eight-channel voltage dividing circuit and the test terminal interface module, and the eight-channel voltage dividing circuit is used to step down the voltages of the eight power terminals to below the maximum input voltage of the multiplexer switch chip; the output terminal of the multiplexer switch chip is connected to the analog-to-digital converter input port of the ARM processor through the sampled voltage signal output port to output the sampled voltage signal.

3. The test board of the flight management navigation computer power supply board according to claim 1 or 2, characterized in that: The test board card further includes a three-channel overvoltage module; The three-channel overvoltage module can access, through the control terminal interface module, three-channel overvoltage voltages provided by an external adjustable power supply and corresponding to three power supply terminals of the power supply board of the flight management and navigation computer under test. Among them, the three power supply terminals are the +15VUUT power supply terminal, the +5VUUT power supply terminal, and the -15VUUT power supply terminal respectively, and each channel of overvoltage voltage exceeds the rated working voltage of its corresponding power supply terminal; and the three-channel overvoltage module can receive, through the control terminal interface module, an overvoltage test instruction sent by an external FPGA controller, and apply, according to this overvoltage test instruction, any one of the overvoltage voltages to the corresponding power supply terminal of the power supply board of the flight management and navigation computer under test through the test terminal interface module.

4. The test card of the power supply board of the flight management navigation computer according to claim 3, characterized in that: The three-channel overvoltage module includes three relays. The input ends of the three relays access the three-channel overvoltage voltages through the control terminal interface module. The output ends of the three relays are connected to the three power supply terminals of the power supply board of the flight management and navigation computer under test through the test terminal interface module. The control ends of the three relays receive the overvoltage test instruction through the control terminal interface module.

5. The test board of the flight management navigation computer power supply board according to claim 3, characterized in that: The test board card further includes a bidirectional level conversion module; The bidirectional level conversion module can receive, through the control terminal interface module, an input / output detection instruction sent by the FPGA controller, and collect, according to this input / output detection instruction, the level state of any input end or any output end of the power supply board of the flight management and navigation computer under test through the test terminal interface module, and send the collected level state to the FPGA controller through the control terminal interface module.

6. The test card of the power supply board of the flight management navigation computer according to claim 5, characterized in that: The bidirectional level conversion module uses a bidirectional level conversion chip with the model number TXS0108.

7. The test card of the power supply board of the flight management navigation computer according to claim 5, characterized in that: The test board card further includes a board card identification module; The board card identification module can receive, through the control terminal interface module, a board card identification instruction sent by the ARM processor, and output, according to this board card identification instruction, the test board card identification number stored in the board card identification module to the ARM processor through the control terminal interface module.

8. The test board of the flight management navigation computer power supply board according to claim 7, characterized in that: The board card identification module uses two register chips with the model number 74HC165.

9. A test method for a power supply board of a flight management navigation computer, characterized in that, Including: Step S1: Connect the test board card described in claim 7 to an adjustable power supply, an ARM processor, an FPGA controller, the power supply board of the flight management and navigation computer under test, and an oscilloscope respectively; Step S2: Send the board card identification instruction to the test board card, and determine whether the read test board card identification number matches the power supply board of the flight management and navigation computer under test. If not, after replacing the test board card that matches the power supply board of the flight management and navigation computer under test, repeat Step S1 and Step S2; Step S3: By sending the analog load instruction to the test board card, in two states of connecting the power resistor load and disconnecting the power resistor load to five power supply terminals of the power supply board of the flight management and navigation computer under test, perform the following Steps S4 to S6; Step S4: Perform power supply fault detection, including: Send the power supply detection instruction to the test board card; If, when sampling any one of the eight power supply terminals of the tested flight management navigation computer power supply board, the ARM processor fails to receive the corresponding voltage signal, it is determined that there is a fault in the corresponding power supply terminal; If the ARM processor can receive the corresponding voltage signals when sampling the eight power supply terminals of the tested flight management navigation computer power supply board, the voltage ripples of the eight power supply terminals are detected by the oscilloscope, and it is determined that there is no fault in the power supply terminal where the voltage ripple is within the preset fluctuation range, and it is determined that there is a fault in the power supply terminal where the voltage ripple is outside the preset fluctuation range; Step S5, perform overvoltage detection on each of the +15VUUT power supply terminal, +5VUUT power supply terminal, and -15VUUT power supply terminal, including: By sending the overvoltage test instruction to the test board card, first apply the corresponding overvoltage to the corresponding power supply terminal, then disconnect the power supply terminal from the overvoltage, and then detect the voltage signal of the power supply terminal through the eight-way power supply detection module. If the detected voltage value is 0, it is determined that the overvoltage protection function of the corresponding power supply terminal of the tested flight management navigation computer power supply board is fault-free; otherwise, it is determined that the overvoltage protection function of the corresponding power supply terminal of the tested flight management navigation computer power supply board has a fault; Step S6, perform input / output terminal fault detection, including: Send the input / output detection instruction to the test board card. If the FPGA controller can receive the level state of the corresponding input terminal or the corresponding output terminal of the tested flight management navigation computer power supply board, it is determined that there is no fault in the input terminal or the output terminal; otherwise, it is determined that there is a fault in the input terminal or the output terminal.

10. The test board of the flight management navigation computer power supply board according to claim 9, characterized in that: The test method further includes: Step S7, output a test report through the PC terminal, and the test report includes the test process data and results of steps S3 to S6.

Images