Device and method for automatically detecting AC and DC performance of external power supply monitor

Abstract

The present invention relates to an automatic detection device and method for AC and DC performance of an external power supply monitor. The device comprises: a signal transfer module, an IO board, a DA board, an AD board, an RS485 board, a signal conditioning module, a standard voltage-stabilized power supply, a program-controlled voltage-stabilized power supply, a signal switching module and an external power supply monitor; the signal conditioning module comprises a relay module, an operational amplifier circuit and a voltage-dividing circuit; the signal switching module comprises a contact switch and a diode; the IO board is respectively connected to the external power supply monitor and the contact switch through the relay module; the DA board is connected to the relay module through the operational amplifier circuit; and the AD board is connected to the external power supply monitor through the voltage-dividing circuit. The AD board is used to collect the timing starting point of the switching process of the program-controlled voltage-stabilized power supply and the time when the external power supply monitor is disconnected from the network, so as to obtain the accurate protection disconnection delay time, thereby realizing accurate detection of the performance of the external power supply monitor.

Description

Technical Field

[0001] The present invention relates to the field of aviation electronics technology, and in particular to an automatic detection device and method for AC and DC performance of an external power supply monitor. Background Art

[0002] The power supply system of a certain aircraft provides the following three power supply systems for onboard electrical equipment: 1) three-phase 115 / 200V, 400Hz AC; 2) single-phase 115 / 200V, 400Hz AC; 3) 28V AC. The aircraft power supply system is mainly composed of the following subsystems: 1) AC power generation and control system; 2) DC power generation and control system; 3) external power supply system; 4) power distribution system. The power supply system supplies power to onboard electrical equipment, so the performance of the power supply system directly affects the stability of onboard electrical equipment. At present, an external power supply monitor is used to monitor the quality of the external power supply, prevent abnormal external power supply from being connected to the aircraft power grid, and protect onboard electrical equipment. When the external power supply is normal, the external power supply contactor is controlled to connect the external power supply to the onboard power grid, that is, the external power supply is connected to the grid. When the external power supply is abnormal, the external power supply contactor is controlled to prevent the external power supply from being connected to the onboard power grid, that is, the external power supply is disconnected from the grid. The external power supply monitor can accurately judge the status of the external power supply, which is an important means to ensure the safety of onboard electrical equipment. To solve this problem, the present invention provides an automatic detection device and method for AC and DC performance of an external power supply monitor. Summary of the invention

[0003] The purpose of the present invention is to provide an automatic detection device and method for the AC and DC performance of an external power supply monitor, which utilizes a signal switching module to switch between a standard regulated power supply and a programmable regulated power supply of different voltage values, and utilizes an AD board card to collect the timing starting point of the protection disconnection during the switching process of the programmable regulated power supply and the moment when the external power supply monitor is disconnected from the network to obtain the protection disconnection delay time, thereby determining the AC and DC monitoring performance of the external power supply monitor based on all the protection disconnection delay times under different voltage values, thereby improving the detection efficiency of the AC and DC monitoring performance index of the external power supply monitor, which is an important indicator for whether the external power supply monitor is qualified before leaving the factory.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] An automatic detection device for AC and DC performance of an external power supply monitor, comprising: a signal transfer module, an IO board, a DA board, an AD board, an RS485 board, a signal conditioning module, a standard voltage-stabilized power supply, a program-controlled voltage-stabilized power supply, a signal switching module and an external power supply monitor;

[0006] The IO board, the DA board, the AD board and the RS485 board are all connected to the industrial control computer through the signal transfer module;

[0007] The signal conditioning module includes a relay module, an operational amplifier circuit and a voltage divider circuit;

[0008] The signal switching module includes a contact switch and a diode connected in anti-parallel with the contact switch;

[0009] The IO board is connected to the external power monitor and the contact switch respectively through the relay module;

[0010] The DA board is connected to the relay module via the operational amplifier circuit;

[0011] The AD board is connected to the external power supply monitor through the voltage divider circuit; the AD board is also connected to the output end of the signal switching module through the voltage divider circuit;

[0012] The RS485 board is connected to the standard regulated power supply and the program-controlled regulated power supply;

[0013] The contact switch is connected to the standard regulated power supply or the program-controlled regulated power supply; the contact switch is connected to the external power supply monitor;

[0014] The IO board and the DA board are used to provide the working condition simulation signal to the external power supply monitor; the IO board is also used to control the signal switching module to perform power switching operation through the relay module;

[0015] The AD board is used to collect the protection disconnection timing starting point and the time when the external power monitor is disconnected from the grid during the switching process of the program-controlled regulated power supply, and to collect the grid connection signal output by the external power monitor;

[0016] The standard voltage-stabilized power supply is used to provide a normal voltage to the airborne equipment; the program-controlled voltage-stabilized power supply is used to provide a fault voltage to the airborne equipment;

[0017] The external power supply monitor is used to detect the performance of the power supply connected to the onboard power grid.

[0018] A method for automatically detecting AC performance of an external power supply monitor, comprising:

[0019] The DA board and the IO board output working condition simulation signals to the external power supply monitor, so that the external power supply monitor is in a working ready state;

[0020] The jth AC voltage value of the i-th type fault voltage is set to the program-controlled voltage-stabilized power supply through the RS485 board, and the initial values ​​of i and j are 1; the first type fault voltage is an AC overvoltage fault voltage; the second type fault voltage is an AC undervoltage fault voltage; the third type fault voltage is an AC overfrequency fault voltage; the fourth type fault voltage is an AC underfrequency fault voltage; the program-controlled voltage-stabilized power supply is a program-controlled AC voltage-stabilized power supply;

[0021] The standard voltage-stabilized power supply is connected to the external power supply monitor by controlling the signal switching module through the relay module using the IO board; the standard voltage-stabilized power supply is a standard AC voltage-stabilized power supply;

[0022] Using the IO board to control the signal switching module through the relay module to connect the current program-controlled regulated power supply to the external power supply monitor, and recording the closing action moment of the relay module as the first timing starting point;

[0023] Using an AD board to collect the grid-connected signal output by the external power supply monitor;

[0024] Determine whether the voltage value of the grid-connected signal is less than the preset voltage value. If so, record the starting time when the voltage value of the grid-connected signal is less than the preset voltage value as the first timing end point; if not, return to the step of "collecting the grid-connected signal output by the external power supply monitor using the AD board card";

[0025] The first protection disconnection delay time is obtained by subtracting the time corresponding to the first timing starting point from the time corresponding to the first timing end point and then subtracting the time taken for the relay module to close;

[0026] Let j=j+1, and return to the step of "setting the jth AC voltage value of the i-th type fault voltage to the program-controlled voltage-stabilized power supply through the RS485 board card" until j reaches the first preset value;

[0027] Let i=i+1, let j be the initial value, and return to the step of "setting the jth AC voltage value of the i-th type fault voltage to the program-controlled voltage-stabilized power supply through the RS485 board card" until j reaches the second preset value;

[0028] The monitoring performance of the external power supply monitor on the AC power supply is judged according to all the first protection disconnection delay times obtained.

[0029] A method for automatically detecting direct current performance of an external power supply monitor, comprising:

[0030] The DA board and the IO board output working condition simulation signals to the external power supply monitor, so that the external power supply monitor is in a working ready state;

[0031] The nth DC voltage value of the mth type fault voltage is set to the program-controlled voltage-stabilized power supply through the RS485 board, and the initial values ​​of m and n are 1; the first type fault voltage is a DC overvoltage fault voltage; the second type fault voltage is a DC undervoltage fault voltage; the program-controlled voltage-stabilized power supply is a program-controlled DC voltage-stabilized power supply;

[0032] The IO board is used to control the signal switching module through the relay module to connect the standard regulated power supply to the external power supply monitor; the standard regulated power supply is a standard DC regulated power supply;

[0033] Using the IO board to control the signal switching module through the relay module to connect the current program-controlled regulated power supply to the external power supply monitor, and recording the time corresponding to the voltage valley value when the working voltage of the external power supply monitor undergoes a negative jump as the second timing starting point;

[0034] Using an AD board to collect the grid-connected signal output by the external power supply monitor;

[0035] Determine whether the voltage value of the grid-connected signal is less than the preset voltage value. If so, record the starting time when the voltage value of the grid-connected signal is less than the preset voltage value as the second timing end point; if not, return to the step of "collecting the grid-connected signal output by the external power supply monitor using the AD board card";

[0036] The second protection disconnection delay time is obtained by subtracting the time corresponding to the second timing starting point from the time corresponding to the second timing end point;

[0037] Let n=n+1, and return to the step of "setting the nth DC voltage value of the mth type fault voltage to the program-controlled regulated power supply through the RS485 board card" until n reaches the first preset value;

[0038] Let m=m+1, let n be the initial value, and return to the step of "setting the nth DC voltage value of the mth type fault voltage to the program-controlled regulated power supply through the RS485 board card" until m reaches the second preset value;

[0039] The monitoring performance of the external power supply monitor on the DC power supply is judged according to all the obtained second protection disconnection delay times.

[0040] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0041] The present invention relates to an automatic detection device and method for AC and DC performance of an external power supply monitor, comprising: a signal transfer module, an IO board, a DA board, an AD board, an RS485 board, a signal conditioning module, a standard voltage-stabilized power supply, a program-controlled voltage-stabilized power supply, a signal switching module and an external power supply monitor; the signal conditioning module comprises a relay module, an operational amplifier circuit and a voltage-dividing circuit; the signal switching module comprises a contact switch and a diode connected in anti-parallel with the contact switch; the IO board is respectively connected to the external power supply monitor and the contact switch through a relay module; the DA board is connected to the relay module through an operational amplifier circuit; the A The D board is connected to the external power monitor through a voltage divider circuit; the RS485 board is connected to the standard voltage-regulated power supply and the program-controlled voltage-regulated power supply; the contact switch is connected to the standard voltage-regulated power supply or the program-controlled voltage-regulated power supply; the contact switch is connected to the external power monitor; the IO board and the DA board are used to provide the external power monitor with a working condition simulation signal; the IO board is also used to control the signal switching module through the relay module to perform a power switching operation; the AD board is used to collect the protection disconnection timing starting point and the time when the external power monitor is disconnected from the network during the switching process of the program-controlled voltage-regulated power supply, and to collect the grid-connected signal output by the external power monitor. The standard voltage-regulated power supply and the program-controlled voltage-regulated power supply of different voltage values ​​are switched by using the signal switching module, and the protection disconnection timing starting point and the time when the external power monitor is disconnected from the network during the switching process of the program-controlled voltage-regulated power supply are collected by using the AD board to obtain the protection disconnection delay time, thereby determining the monitoring performance of the external power monitor according to all protection disconnection delay times under different voltage values, thereby improving the accuracy of the performance detection of the external power monitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 A structural diagram of an automatic detection device for AC and DC performance of an external power supply monitor provided in Example 1 of the present invention;

[0044] Figure 2 A structural diagram of an automatic detection device for AC performance of an external power supply monitor provided in Example 1 of the present invention;

[0045] Figure 3 A structural diagram of an automatic detection device for DC performance of an external power supply monitor provided in Example 1 of the present invention;

[0046] Figure 4A flow chart of a method for automatically detecting AC performance of an external power supply monitor provided in Embodiment 2 of the present invention;

[0047] Figure 5 A circuit structure diagram of a signal switching module in AC detection provided in Embodiment 2 of the present invention;

[0048] Figure 6 A protection disconnection delay time curve in AC detection provided by Embodiment 2 of the present invention;

[0049] Figure 7 A flow chart of a method for automatically detecting DC performance of an external power supply monitor provided in Embodiment 3 of the present invention;

[0050] Figure 8 A protection disconnection delay time curve in DC detection provided in Example 3 of the present invention;

[0051] Fig. 9 This is a circuit structure diagram of the signal switching module in DC detection provided in Example 3 of the present invention. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] The purpose of the present invention is to provide an automatic detection device and method for the AC and DC performance of an external power supply monitor, which utilizes a signal switching module to switch between a standard regulated power supply and a programmable regulated power supply of different voltage values, and utilizes an AD board card to collect the timing starting point of the protection disconnection and the time when the external power supply monitor is disconnected from the network during the switching process of the programmable regulated power supply to obtain the protection disconnection delay time, thereby determining the monitoring performance of the external power supply monitor according to all the protection disconnection delay times under different voltage values, thereby improving the accuracy of the performance detection of the external power supply monitor.

[0054] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0055] Example 1

[0056] like Figure 1 As shown, this embodiment provides an external power supply monitor AC and DC performance automatic detection device, including: a signal transfer module, an IO board, a DA board, an AD board, an RS485 board, a signal conditioning module, a standard regulated power supply, a program-controlled regulated power supply, a signal switching module and an external power supply monitor;

[0057] The IO board, the DA board, the AD board and the RS485 board are all connected to the industrial control computer through the signal transfer module;

[0058] The signal conditioning module includes a relay module, an operational amplifier circuit and a voltage divider circuit;

[0059] The signal switching module includes a contact switch and a diode connected in anti-parallel with the contact switch;

[0060] The IO board is connected to the external power monitor and the contact switch respectively through the relay module;

[0061] The DA board is connected to the relay module via the operational amplifier circuit;

[0062] The AD board is connected to the external power supply monitor through the voltage divider circuit; the AD board is also connected to the output end of the signal switching module through the voltage divider circuit;

[0063] The RS485 board is connected to the standard regulated power supply and the program-controlled regulated power supply;

[0064] The contact switch is connected to the standard regulated power supply or the program-controlled regulated power supply; the contact switch is connected to the external power supply monitor; the standard regulated power supply or the program-controlled regulated power supply is selected to access the onboard power grid through the contacts of the contact switch. For AC switching, the signal switching module is an AC three-phase electrical signal switching module, which requires phase-by-phase switching when switching signals. For DC switching, the signal switching module is a DC signal switching module.

[0065] The IO board and the DA board are used to provide the working condition simulation signal to the external power supply monitor; the IO board is also used to control the signal switching module to perform power switching operation through the relay module;

[0066] The AD board is used to collect the voltage valley moment of the negative jump of the working voltage of the external power supply monitor when switching to the program-controlled regulated power supply; and is also used to collect the grid-connected signal output by the external power supply monitor;

[0067] The standard voltage-stabilized power supply is used to provide a normal voltage to the airborne equipment; the program-controlled voltage-stabilized power supply is used to provide a fault voltage to the airborne equipment;

[0068] like Figure 2 and 3 As shown, when conducting AC performance testing, the standard regulated power supply is the standard AC regulated power supply, that is, Figure 2The AC process-controlled power supply No. 1 in the test; when conducting DC performance testing, the standard regulated power supply is the standard DC regulated power supply, that is, Figure 3 The DC 27V standard regulated power supply is used. Similarly, when performing AC performance testing, the program-controlled regulated power supply is a program-controlled AC regulated power supply, that is, Figure 2 The AC program-controlled power supply No. 2 in the test; when conducting DC performance testing, the program-controlled regulated power supply is Figure 3 The industrial computer sets the standard regulated power supply as AC power supply or DC power supply through the RS485 board; the industrial computer sets different AC and DC fault voltage values ​​of the program-controlled regulated power supply through the RS485 board.

[0069] The external power supply monitor is used to detect the performance of the power supply connected to the onboard power grid.

[0070] The industrial computer realizes the program control of the AC and DC performance detection of the entire external power supply monitor; the signal transfer module realizes the extended connection between the industrial computer and the I / O board, D / A board, A / D board, and RS485 board, which is convenient for the connection between the terminals of each board and peripheral devices; the signal conditioning module realizes the connection between the I / O board and the relay module in the signal conditioning module, and realizes the amplification of the analog 5V signal output by the D / A board (due to the working state of the simulated external power supply monitor, it is necessary to provide an external power supply with a working voltage of 25V to 27V, and the D / A board itself The maximum voltage provided by the device is ±10V. The D / A card in the design mainly uses 0~5V, so the voltage signal needs to be amplified to 25V~27V), and the grid-connected signal collected by the A / D board is divided (because the grid-connected output signal of the external power supply monitor is 27V, the A / D card can only collect ±10V signals, so it needs to be divided to 5V before collection); the RS485 board realizes the conversion between the RS232 interface and the RS485 interface of the industrial computer, RS485 communicates with the program-controlled power supply and the standard power supply, and RS232 communicates with the industrial computer. The standard AC regulated power supply outputs a standard AC voltage of 115V 400HZ, which provides a standard AC monitoring voltage for the external power supply monitor. The program-controlled AC regulated power supply is used to adjust the output voltage of the overvoltage, undervoltage, overfrequency, and underfrequency test detection points. The AC three-phase electrical signal switching module realizes switching between the program-controlled AC regulated power supply and the standard AC regulated power supply during the test and detection process, which is convenient for the industrial computer to automatically test overvoltage, undervoltage, overfrequency, and underfrequency performance tests. The program-controlled DC regulated power supply generates a set DC voltage signal (provides overvoltage and undervoltage voltage) under the control of the industrial computer. The DC 27V standard regulated power supply provides a standard working DC voltage for the external power supply monitor. The DC signal switching module realizes switching between the program-controlled DC regulated power supply and the 27V standard regulated power supply during the test and detection process, which is convenient for the industrial computer to automatically test overvoltage and undervoltage performance tests.

[0071] The IO card, DA card, AD card and RS485 board are installed on the main board of the industrial computer. Each board is connected through its own signal adapter board and the signal conditioning module of the expansion connection terminal board. The industrial computer controls the IO card to output a 0-5V electrical frequency signal, which is sent to the signal conditioning module for level conversion and then provided to a switch signal that meets the technical requirements of the product. The DA board can output multiple 0-5V voltage signals, which are output through the operational amplifier circuit on the signal conditioning board to achieve an adjustable analog signal output of 0-27VDC, and provided to an analog signal that meets the technical requirements of the external power supply monitor.

[0072] During AC detection, when the working conditions provided by the IO card and the DA card to the external power monitor are met, the AD card is started to collect the grid-connected output signal to obtain the external power monitor's overvoltage, undervoltage, overfrequency, and underfrequency protection disconnection delay time and self-locking status monitoring. (That is, grid-connected signal monitoring, if the AC power supply is normal, the grid-connected signal is valid, if the AC power supply signal is overvoltage or undervoltage, the external power grid-connected output terminal will output a low level within a certain period of time, making the grid connection invalid. Protection disconnection delay time and self-locking status of various AC power supplies (overvoltage, undervoltage, overfrequency, underfrequency) external power monitors.

[0073] During DC detection, when all the working conditions provided by the IO card and DA card to the external power monitor are met, the AD card is started to collect the grid-connected output signal to obtain the overvoltage or undervoltage time and self-locking status monitoring of the external power monitor. (That is, grid-connected signal monitoring, if the DC power supply is normal, the grid-connected signal is valid, if the DC power supply signal is overvoltage or undervoltage, the external power grid-connected output terminal will output a low level within a certain period of time, making the grid connection invalid. Need to measure: the disconnection time and self-locking status of various DC power supplies (undervoltage, overvoltage) external power monitors. Note: The lower the DC fault power supply voltage, the lower the grid-connected output voltage signal will be. In order to facilitate the uniformity of detection, the system amplifies all 1V grid-connected output signals to 5v for AD acquisition.

[0074] Traditional AC / DC performance testing requires a bunch of instruments and equipment to monitor a single signal. The detection system of this embodiment can automatically measure the off-grid delay time of each faulty AC / DC power supply signal with one click, and quickly verify whether the product quality is qualified or not.

[0075] Example 2

[0076] like Figure 4 As shown, this embodiment provides a method for automatically detecting AC performance of an external power supply monitor, including:

[0077] S1: The DA board and the IO board output working condition simulation signals to the external power supply monitor, so that the external power supply monitor is in a working ready state;

[0078] S2: Setting the jth AC voltage value of the i-th type fault voltage to the program-controlled voltage-stabilized power supply through the RS485 board, the initial values ​​of i and j are 1; the first type fault voltage is an AC overvoltage fault voltage; the second type fault voltage is an AC undervoltage fault voltage; the third type fault voltage is an AC overfrequency fault voltage; the fourth type fault voltage is an AC underfrequency fault voltage; the program-controlled voltage-stabilized power supply is a program-controlled AC voltage-stabilized power supply;

[0079] Different types of fault voltages correspond to j voltage values, and different types of fault voltages have different j values; specifically, the j AC voltage values ​​of the AC overvoltage fault voltage include: 136V-400Hz, 146V-400Hz, 156V-400Hz and 166V-400Hz in sequence;

[0080] The j kinds of AC voltage values ​​of the AC undervoltage fault voltage include: 98V-400Hz and 9V-400Hz;

[0081] The j kinds of AC voltage values ​​of the AC over-frequency fault voltage include: 115V-425Hz and 115V-485Hz

[0082] The j kinds of AC voltage values ​​of the AC under-frequency fault voltage include: 115V-385Hz and 115V-325Hz.

[0083] S3: Using the IO board to control the signal switching module through the relay module to connect the standard regulated power supply to the external power supply monitor; the standard regulated power supply is a standard AC regulated power supply;

[0084] S4: using the IO board to control the signal switching module through the relay module to connect the current program-controlled regulated power supply to the external power supply monitor, and recording the closing action moment of the relay module as the first timing starting point;

[0085] In this step, it is necessary to switch the program-controlled AC power supply to the onboard power grid, and the performance of the program-controlled AC power supply is detected by the external power supply monitor. If the switch is made directly, the three phases of the AC voltage cannot be switched at the same time, and there will be a time difference of 1 to 2ms (caused by the characteristics of the relay). Only after a stop command is issued to the program-controlled AC regulated power supply, and then a start command is issued to the program-controlled AC regulated power supply, and "115V400Hz" is set, can the "AC three-phase electrical signal" be powered at the same time, and the "external power supply monitor" can be tested normally. Therefore, before step S4, the current program-controlled regulated power supply needs to be shut down and then restarted.

[0086] Since there is an error in the switching time of the three-phase AC relay circuit, and when the relay fails to work, the two AC signal sources will short-circuit between phases during switching, burning the equipment. In order to improve the stability and safety of the detection equipment, the two phases of the two AC power sources are connected to different normally open and normally closed contacts of the relay module during circuit design. A fast recovery diode is added to the control end of each relay module, which greatly improves the response speed of the switching circuit and avoids the occurrence of such problems. Figure 5 As shown, the signal switching module includes a first resistor R53, a second resistor 57, a transistor VD17, a contact switch J13, a diode VD13 connected in series with the relay D14 in the relay module, and a third resistor 55 with one end grounded and the other end connected between the first resistor R53 and the second resistor R57. The AC voltage involves three phases, and a contact switch and a diode connected in parallel to the two ends of the contact switch are required for each phase. Therefore, the switching circuit also includes a contact switch J14 for the B phase voltage and a diode VD14 connected in parallel to the two ends of the contact switch; a contact switch J15 for the C phase voltage and a diode VD15 connected in parallel to the two ends of the contact switch. For DC, there is no structure corresponding to phase B and phase C.

[0087] Before switching to the program-controlled AC power supply, it is necessary to connect the standard AC regulated power supply to the onboard power grid so that the external power supply outputs a normal grid-connected signal. Considering that when the standard AC regulated power supply is connected to the external power supply monitor, the external power supply monitor has a self-locking phenomenon, so before step S4, it also includes:

[0088] Determine whether the grid-connected signal output by the external power supply monitor when connected to the standard regulated power supply is valid; (valid here means whether the grid-connected signal has a voltage value of 25-27V)

[0089] If it is valid, proceed to the step of "using the IO board to control the signal switching module through the relay module to connect the current program-controlled regulated power supply to the external power supply monitor";

[0090] If it is invalid, a reset control signal is first sent to the external power monitor through the IO board to restore the external power monitor to a normal working state.

[0091] S5: using an AD board to collect the grid-connected signal output by the external power supply monitor;

[0092] S6: Determine whether the voltage value of the grid-connected signal is less than a preset voltage value, and if so, record the start time when the voltage value of the grid-connected signal is less than the preset voltage value as the first timing end point;

[0093] If not, return to step S5;

[0094] S7: subtracting the time corresponding to the first timing starting point from the time corresponding to the first timing end point and then subtracting the time taken for the relay module to close to obtain a first protection disconnection delay time;

[0095] S8: Set j=j+1, and return to step S2 until j reaches a first preset value;

[0096] S9: Let i=i+1, let j be the initial value, and return to step S2 until i reaches the second preset value;

[0097] S10: judging the monitoring performance of the external power monitor on the AC power supply according to all the obtained first protection disconnection delay times.

[0098] In this embodiment, Figure 6 The diagram shows the protection disconnection delay time t1 in AC detection as the protection disconnection time curve of the external power supply monitor for overvoltage, undervoltage, overfrequency and underfrequency, that is, after the industrial computer controls the I / O board and the D / A board to output the normal working signal of the external power supply monitor, the standard AC regulated power supply outputs the standard AC working power supply of 115V400HZ, and the grid-connected signal of the external power supply monitor (rising to between 25V and 27V) is effective, and then the "AC three-phase electrical signal switching module" is used to switch to the overvoltage, undervoltage, overfrequency and underfrequency power supply signal set by the programmable AC regulated power supply, and the protection disconnection time of the external power supply monitor.

[0099] AC t1 detection method:

[0100] To measure the AC t1 external power supply monitor protection off-grid time, it mainly detects the grid-connected output voltage signal of the external power supply monitor and collects the voltage value through the AD card. Specifically, the industrial control computer controls the DA card and IO card to output the initial signal of the working status of the external power supply monitor, and then connects the standard AC working power supply of 115V400HZ output by the "standard AC regulated power supply" to the AC signal of the external power supply monitor (the three-phase power ABC terminals are connected respectively), so that the AC grid-connected signal terminal output of the external power supply monitor is valid (27VDC); the industrial control computer outputs the set voltage setting commands of the test overvoltage, undervoltage, overfrequency and underfrequency to the "programmed AC regulated power supply" through the RS485 communication interface, and the "programmed AC The "programmed AC regulated power supply" automatically adjusts the output three-phase AC voltage of the "programmed AC regulated power supply" to the set voltage value according to the voltage setting command (the AC program-controlled power supply adjusts the voltage quickly, generally completed within 1 second). Therefore, after a delay of 2s after the adjustment command is issued, the industrial control computer reads back the current voltage value of the "programmed AC regulated power supply". When the "programmed AC regulated power supply" is adjusted to the set voltage value ±0.1V (the allowable error is plus or minus 0.2V), the acquisition card (AD card) is first controlled to collect the grid-connected output terminal of the "external power supply monitor", and then the signal AC three-phase electrical signal switching module is controlled to switch the monitoring power supply of the external power supply monitor from the "standard AC regulated power supply" to the "programmed AC regulated power supply". The timing starts when the relay switching command is issued (because the AC switching relay has a voltage of 115V, negative jumps will not occur when switching non-weak current signals, so the timing starts when the relay command is issued), and the timing ends when the "programmed AC regulated power supply" supplies power to the "external power supply monitor" to disconnect the grid signal. The timing end point-timing start point-relay action time is the overvoltage, undervoltage, overfrequency, and underfrequency protection disconnection delay time. (This measurement method has an error of 1 to 2ms due to the instability of the relay action time, which meets the design requirements. Since the protection delay time is as long as 3 to 4 seconds and as short as 30ms, the error of 1 to 2ms is within the allowable range).

[0101] The following uses an external power supply monitor of the EXD series as an example to explain the experimental process of AC overvoltage or undervoltage performance detection of the external power supply monitor:

[0102] Step 1: The industrial computer initializes the AD card, IO card, and DA card.

[0103] Step 2: Through the industrial control computer, control the IO card and DA card to provide the external power monitor with working condition simulation signals to put it in a working ready state.

[0104] Step 3: The industrial computer controls the IO card to switch the monitoring power of the "external power supply monitor" to the "standard AC regulated power supply" to output a standard AC power supply of 115V 400HZ, and detect whether there is a grid-connected signal output at the AC grid-connected signal output terminal of the "external power supply monitor" (the grid-connected output terminal outputs 27V), that is, the "external power supply monitor" connects the AC power supply to the grid.

[0105] Step 4: The industrial computer outputs the set voltage setting commands of overvoltage, undervoltage, overfrequency and underfrequency to the "programmed AC regulated power supply" through the RS485 communication interface (overvoltage and undervoltage tests only adjust the AC voltage, and the frequency remains unchanged at 400HZ; overfrequency and underfrequency tests only adjust the frequency, and the AC voltage remains unchanged at 115V). The "programmed AC regulated power supply" automatically adjusts the output voltage and frequency of the "programmed AC regulated power supply" to the set values ​​according to the voltage setting command (the program-controlled voltage adjustment sequence is: overvoltage protection detection point: 136V 400Hz, 146V 400Hz, 156V 400Hz, 166V 400Hz; undervoltage protection detection point: 98V400Hz, 9V400Hz; overfrequency protection detection point: 115V 425Hz, 115V485Hz; underfrequency protection detection point: 115V385Hz, 115V 325Hz);

[0106] Step 5: The industrial computer controls the acquisition card (AD card) to collect the AC grid-connected output terminal of the "external power supply monitor", and the industrial computer controls the "AC three-phase electrical signal switching module" to switch the monitored AC power supply of the "external power supply monitor" from the "standard AC regulated power supply" to the "programmed AC regulated power supply". The industrial computer uses the relay switching action in the "AC three-phase electrical signal switching module" as the timing starting point (the AC three-phase electrical signal switching has a voltage of 115V and is not a weak current signal. There is no negative jump at the end of the relay, so the timing can start when the relay switching command is issued). The "programmed AC regulated power supply" outputs a fault AC voltage to disconnect the AC grid-connected signal of the "external power supply monitor" from the grid as the timing end point. The timing end point-timing start point-relay action time is the overvoltage, undervoltage, overfrequency, and underfrequency protection disconnection delay time.

[0107] Step 6: Because the "external power supply monitor" has been disconnected from the network, the industrial computer controls the "AC three-phase electrical signal switching module" through the IO card to switch the monitoring power supply of the external power supply monitor from the "programmed AC regulated power supply" to the "standard AC regulated power supply". First, a stop command is issued to the "programmed AC regulated power supply", and then a start command is issued to the "programmed AC regulated power supply", and the "115V 400Hz", (Note: Unlike switching to the working power supply, when switching to the "programmed AC regulated power supply", the "external power supply monitor" should be able to connect to the AC grid normally. However, it is found that direct switching cannot complete the switching action of the three phases of AC at the same time. There will be a time difference of 1 to 2ms (caused by the characteristics of the relay). If the test is continued after direct AC switching, the test data will be incorrect. Only after issuing a stop command to the "programmed AC regulated power supply", and then issuing a start command to the "programmed AC regulated power supply", and setting "115V400Hz", can the "AC three-phase electrical signal be supplied at the same time" and the "external power supply monitor" can be tested normally) the industrial control computer detects whether the grid-connected signal at the AC grid-connected signal output end of the "external power supply monitor" is valid. If it is (27V), it is valid. If it is a low level, it is invalid. The invalid grid-connected signal indicates that the "external power supply monitor" is self-locked. The industrial control computer needs to send a "reset control signal" to the "external power supply monitor" through the IO card to restore the "external power supply monitor" to normal operation. Go to step 4 and continue the "external power monitor" test for other overvoltage, undervoltage, overfrequency and underfrequency measurement points. (Go to step 4 and the program-controlled voltage adjustment sequence is: program-controlled voltage adjustment sequence is: overvoltage protection detection point: 136V 400Hz, 146V 400Hz, 156V 400Hz, 166V 400Hz; undervoltage protection detection point: 98V 400Hz, 9V400Hz; overfrequency protection detection point: 115V425Hz, 115V 485Hz; underfrequency protection detection point: 115V 385Hz, 115V325Hz)

[0108] Step 7: Complete all overvoltage and undervoltage AC voltage tests, obtain the corresponding protection disconnection delay time, and determine whether the external power monitor meets the design requirements. Store the test data in the database for historical query.

[0109] Example 3

[0110] like Figure 7 As shown, this embodiment provides a method for automatically detecting DC performance of an external power supply monitor, including:

[0111] T1: The DA board and the IO board output working condition simulation signals to the external power supply monitor, so that the external power supply monitor is in a working ready state;

[0112] T2: setting the nth DC voltage value of the mth type fault voltage to the program-controlled voltage-stabilized power supply through the RS485 board, where the initial values ​​of m and n are 1; the first type fault voltage is a DC overvoltage fault voltage; the second type fault voltage is a DC undervoltage fault voltage; the program-controlled voltage-stabilized power supply is a program-controlled DC voltage-stabilized power supply;

[0113] Different types of fault voltages correspond to n voltage values, and the n values ​​of different types of fault voltages are different; the n DC voltage values ​​of the DC overvoltage fault voltage include: 31.5V, 36V, 41V, 46V and 51V in sequence;

[0114] The n DC voltage values ​​of the DC undervoltage fault voltage include: 19.5V, 17V, 13V, 7.5V, and 1.5V in sequence.

[0115] T3: Using the IO board to control the signal switching module through the relay module to connect the standard regulated power supply to the external power supply monitor; the standard regulated power supply is a standard DC regulated power supply;

[0116] T4: using the IO board to control the signal switching module through the relay module to connect the current program-controlled regulated power supply to the external power supply monitor, and using the AD board to collect the negative jump voltage of the standard DC voltage, and recording the time corresponding to the valley value of the negative jump voltage as the second timing starting point; the collection of the second timing starting point can also be understood as simultaneously recording the time corresponding to the voltage valley value of the diode in the signal switching module when it negatively jumps as the second timing starting point;

[0117] Before switching to the program-controlled DC power supply, it is necessary to connect the standard DC regulated power supply to the onboard power grid so that the external power supply outputs a normal grid-connected signal. Considering that when the standard DC regulated power supply is connected to the external power supply monitor, the external power supply monitor has a self-locking phenomenon, so before step T4, it also includes:

[0118] Determine whether the grid-connected signal output by the external power supply monitor when connected to the standard regulated power supply is valid; (valid here means whether the grid-connected signal has a voltage value of 25-27V)

[0119] If it is valid, proceed to the step of "using the IO board to control the signal switching module through the relay module to connect the current program-controlled regulated power supply to the external power supply monitor";

[0120] If it is invalid, a reset control signal is first sent to the external power monitor through the IO board to restore the external power monitor to a normal working state.

[0121] T5: using an AD board to collect the grid-connected signal output by the external power supply monitor;

[0122] T6: Determine whether the voltage value of the grid-connected signal is less than the preset voltage value. If so, record the start time when the voltage value of the grid-connected signal is less than the preset voltage value as the second timing end point; if not, return to step T5;

[0123] T7: the second protection disconnection delay time is obtained by subtracting the time corresponding to the second timing start point from the time corresponding to the second timing end point;

[0124] T8: let n=n+1, and return to the step of "setting the nth DC voltage value of the mth type fault voltage to the program-controlled voltage-stabilized power supply through the RS485 board card" until n reaches the first preset value;

[0125] T9: let m=m+1, let n be the initial value, and return to the step of "setting the nth DC voltage value of the mth type fault voltage to the program-controlled voltage-stabilized power supply through the RS485 board card" until m reaches the second preset value;

[0126] T10: judging the monitoring performance of the external power supply monitor on the DC power supply according to all the obtained second protection disconnection delay times.

[0127] Figure 8 The DC t1 is the overvoltage or undervoltage protection disconnection time curve, that is, after the industrial computer controls the I / O board and the D / A board to output the normal grid-connected working signal of the external power supply monitor, the external power supply monitor grid-connected signal (rising to between 25V and 27V) is valid, and then switches to the undervoltage or overvoltage power supply signal, and the time it takes for the external power supply monitor to disconnect from the grid.

[0128] DC t1 detection method:

[0129] The time spent on measuring DC t1 is mainly to detect the grid-connected output voltage signal of the external power supply monitor and collect the voltage value through the AD card. Specifically, the industrial control computer controls the DA card and IO card to output the initial signal of the working status of the external power supply monitor, and then connects the DC 27V standard regulated power supply to the power supply end of the external power supply monitor to make the grid-connected signal end output of the external power supply monitor valid (27VDC); the industrial control computer outputs the set voltage setting command of the test overvoltage or undervoltage to the programmable DC regulated power supply through the RS485 communication interface. The voltage is automatically adjusted to the set voltage value according to the voltage setting command. The industrial computer reads back the current voltage value of the program-controlled DC regulated power supply every 500ms. When the program-controlled DC regulated power supply is adjusted to the set voltage value ±0.1V (the allowable error is plus or minus 0.2V), the acquisition card (AD card) is controlled to collect the grid-connected output terminal of the "external power supply monitor", and then the DC signal switching module is controlled to switch the working power supply of the external power supply monitor from the "DC 27V standard regulated power supply" to the "program-controlled DC regulated power supply". The negative jump after the relay switching (here refers to the valley moment of the negative voltage of the diode connected in parallel at both ends of the contact switch) is the timing starting point, and the "program-controlled DC regulated power supply" is used to supply power to disconnect the grid signal of the "external power supply monitor" as the timing end point. The timing end-timing start time is the overvoltage or undervoltage disconnection time.

[0130] like Fig. 9 As shown, the signal switching module includes a first resistor R54, a second resistor R58, a transistor VD18, a contact switch J16, a diode VD16 connected in series with the relay VD14 in the relay module, and a third resistor R56 with one end grounded and the other end connected between the first resistor R54 and the second resistor R58. Since the IO board controls the signal switching module to switch the power supply through the relay VD14 of the relay module, when the relay in the relay module is closed, the contact in the contact switch is connected to the program-controlled voltage-stabilized power supply, and a reverse voltage will appear in the diode VD16. The valley time of the reverse voltage is taken as the starting point for measuring the protection disconnection delay time t1, and the protection disconnection delay time can be accurately known.

[0131] The following uses an external power supply monitor of the EXD series as an example to explain the DC overvoltage or undervoltage performance detection process of the external power supply monitor:

[0132] Step 1: The industrial computer initializes the AD card, IO card, and DA card.

[0133] Step 2: Through the industrial control computer, control the IO card and DA card to provide the external power monitor with working condition simulation signals to put it in a working ready state.

[0134] Step 3: The industrial computer controls the IO card to switch the working power of the "external power supply monitor" to the "DC 27V standard regulated power supply" and detects whether the grid-connected signal output terminal of the "external power supply monitor" has a grid-connected signal output (the grid-connected output terminal outputs 27V), that is, the "external power supply monitor" is connected to the grid.

[0135] Step 4: The industrial computer outputs the set voltage setting command of the test overvoltage or undervoltage to the "programmed DC regulated power supply" through the RS485 communication interface. The "programmed DC regulated power supply" automatically adjusts the output voltage of the "programmed DC regulated power supply" to the set voltage value according to the voltage setting command. The industrial computer reads back the current voltage value of the programmed DC regulated power supply every 500ms and adjusts the programmed DC regulated power supply to the set voltage value ±0.1V (the allowable error is plus or minus 0.2V). (The program-controlled voltage adjustment sequence is: overvoltage detection point 31.5V, 36V, 41V, 46V, 51V, undervoltage detection point 19.5V, 17V, 13V, 7.5V, 1.5V)

[0136] Step 5: The industrial computer controls the acquisition card (AD card) to collect the grid-connected output terminal of the "external power monitor", and then controls the DC signal switching module to switch the working power of the external power monitor from the "DC 27V standard voltage-stabilized power supply" to the "program-controlled DC voltage-stabilized power supply". The negative jump of the relay switching is the timing starting point, and the timing end point is when the "external power monitor" grid-connected signal is disconnected from the grid by the "program-controlled DC voltage-stabilized power supply". The timing end-timing start time is the overvoltage or undervoltage grid-connected time.

[0137] Step 6: Because the "external power supply monitor" has been disconnected from the network, the industrial computer controls the switching module through the IO card to switch the working power supply of the external power supply monitor from the "programmed DC regulated power supply" to the "DC 27V standard regulated power supply". The industrial computer detects the grid-connected signal at the grid-connected signal output terminal of the "external power supply monitor". If it is (greater than 5V), it is valid. (DC grid-connected output voltage indicates that the smaller the monitored DC power supply signal, the more unstable the grid-connected output signal. The lowest grid-connected power supply that is not disconnected from the network is 0.8V) (measured value)) If it is below 0.8V, it is invalid. The invalid grid-connected signal indicates that the "external power supply monitor" is self-locked. The industrial computer needs to send a "reset control signal" to the "external power supply monitor" through the IO card to restore the "external power supply monitor" to normal operation. Then go to step 4 and continue to perform the "external power supply monitor" detection test for other overvoltage and undervoltage measurement point voltages. (Go to the fourth step and the program-controlled voltage adjustment sequence is: overvoltage detection points 31.5V, 36V, 41V, 46V, 51V, undervoltage detection points 19.5V, 17V, 13V, 7.5V, 1.5V)

[0138] Step 7: Complete all overvoltage and undervoltage DC voltage tests, determine whether the external power monitor meets the design requirements based on all the protection disconnection delay times obtained, and store the data in the database for historical query.

[0139] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0140] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for automatically detecting AC performance of an external power supply monitor, characterized in that: The method for automatically detecting the AC performance of an external power supply monitor is implemented based on an automatic detection device for the AC and DC performance of an external power supply monitor, and the automatic detection device for the AC and DC performance of an external power supply monitor comprises: a signal transfer module, an IO board, a DA board, an AD board, an RS485 board, a signal conditioning module, a standard regulated power supply, a program-controlled regulated power supply, a signal switching module and an external power supply monitor; The IO board, the DA board, the AD board and the RS485 board are all connected to the industrial control computer through the signal transfer module; The signal conditioning module includes a relay module, an operational amplifier circuit and a voltage divider circuit; The signal switching module includes a contact switch and a diode connected in anti-parallel with the contact switch; The IO board is connected to the external power monitor and the contact switch respectively through the relay module; The DA board is connected to the relay module via the operational amplifier circuit; The AD board is connected to the external power supply monitor through the voltage divider circuit; the AD board is also connected to the output end of the signal switching module through the voltage divider circuit; The RS485 board is connected to the standard regulated power supply and the program-controlled regulated power supply; The contact switch is connected to the standard regulated power supply or the program-controlled regulated power supply; the contact switch is connected to the external power supply monitor; The IO board and the DA board are used to provide the working condition simulation signal to the external power supply monitor; the IO board is also used to control the signal switching module to perform power switching operation through the relay module; The AD board is used to collect the protection disconnection timing starting point when the program-controlled voltage-stabilized power supply is switched and the time when the external power supply monitor is disconnected from the grid, and to collect the grid connection signal output by the external power supply monitor; The standard voltage-stabilized power supply is used to provide a normal voltage to the airborne equipment; the program-controlled voltage-stabilized power supply is used to provide a fault voltage to the airborne equipment; The external power supply monitor is used to detect the performance of the power supply connected to the onboard power grid; The method for automatically detecting AC performance of an external power supply monitor comprises: The DA board and the IO board output working condition simulation signals to the external power supply monitor, so that the external power supply monitor is in a working ready state; The jth AC voltage value of the i-th type fault voltage is set to the program-controlled voltage-stabilized power supply through the RS485 board, and the initial values ​​of i and j are 1; the first type fault voltage is an AC overvoltage fault voltage; the second type fault voltage is an AC undervoltage fault voltage; the third type fault voltage is an AC overfrequency fault voltage; the fourth type fault voltage is an AC underfrequency fault voltage; the program-controlled voltage-stabilized power supply is a program-controlled AC voltage-stabilized power supply; The standard voltage-stabilized power supply is connected to the external power supply monitor by controlling the signal switching module through the relay module using the IO board; the standard voltage-stabilized power supply is a standard AC voltage-stabilized power supply; Using the IO board to control the signal switching module through the relay module to connect the current program-controlled regulated power supply to the external power supply monitor, and recording the closing action moment of the relay module as the first timing starting point; Using an AD board to collect the grid-connected signal output by the external power supply monitor; Determine whether the voltage value of the grid-connected signal is less than the preset voltage value. If so, record the starting time when the voltage value of the grid-connected signal is less than the preset voltage value as the first timing end point; if not, return to the step of "collecting the grid-connected signal output by the external power supply monitor using the AD board card"; The first protection disconnection delay time is obtained by subtracting the time corresponding to the first timing starting point from the time corresponding to the first timing end point and then subtracting the time taken for the relay module to close; Let j=j+1, and return to step "setting the jth AC voltage value of the i-th type fault voltage to the program-controlled regulated power supply through the RS485 board card" until j reaches the first preset value; Let i=i+1, let j be the initial value, and return to step "setting the jth AC voltage value of the i-th type fault voltage to the program-controlled regulated power supply through the RS485 board card" until j reaches the second preset value; The monitoring performance of the external power supply monitor on the AC power supply is judged according to all the first protection disconnection delay times obtained.

2. The method for automatically detecting AC performance of an external power supply monitor according to claim 1, characterized in that: Except for the case where i and j are both initial values, before the step of "using the IO board to control the signal switching module through the relay module to connect the current programmable regulated power supply to the external power supply monitor", it also includes shutting down the current programmable regulated power supply and then restarting it.

3. The method for automatically detecting AC performance of an external power supply monitor according to claim 1, characterized in that: The j kinds of AC voltage values ​​of the AC overvoltage fault voltage include: 136V-400Hz, 146V-400Hz, 156V-400Hz and 166V-400Hz; The j kinds of AC voltage values ​​of the AC undervoltage fault voltage include: 98V-400Hz and 9V-400Hz; The j kinds of AC voltage values ​​of the AC over-frequency fault voltage include: 115V-425Hz and 115V-485Hz; The j kinds of AC voltage values ​​of the AC under-frequency fault voltage include: 115V-385Hz and 115V-325Hz.

4. The method for automatically detecting AC performance of an external power supply monitor according to claim 1, characterized in that: Before the step of "using the IO board to control the signal switching module through the relay module to connect the current program-controlled regulated power supply to the external power supply monitor", it also includes: Determine whether the grid-connected signal output by the external power supply monitor when connected to the standard regulated power supply is valid; If valid, proceed to step "using the IO board to control the signal switching module through the relay module to connect the current program-controlled regulated power supply to the external power supply monitor"; If it is invalid, a reset control signal is first sent to the external power monitor through the IO board to restore the external power monitor to a normal working state.

5. The method for automatically detecting AC performance of an external power supply monitor according to claim 1, characterized in that: The working condition simulation signal includes providing a 27V external power supply monitor working voltage, a DC power supply switch terminal connected, an AC voltage switch terminal connected, and a port not connected when the engine is not in the starting state.

6. A method for automatically detecting the DC performance of an external power supply monitor, characterized in that: The method for automatically detecting the DC performance of an external power supply monitor is implemented based on an automatic detection device for the AC and DC performance of an external power supply monitor, and the automatic detection device for the AC and DC performance of an external power supply monitor comprises: a signal transfer module, an IO board, a DA board, an AD board, an RS485 board, a signal conditioning module, a standard regulated power supply, a program-controlled regulated power supply, a signal switching module and an external power supply monitor; The IO board, the DA board, the AD board and the RS485 board are all connected to the industrial control computer through the signal transfer module; The signal conditioning module includes a relay module, an operational amplifier circuit and a voltage divider circuit; The signal switching module includes a contact switch and a diode connected in anti-parallel with the contact switch; The IO board is connected to the external power monitor and the contact switch respectively through the relay module; The DA board is connected to the relay module via the operational amplifier circuit; The AD board is connected to the external power supply monitor through the voltage divider circuit; the AD board is also connected to the output end of the signal switching module through the voltage divider circuit; The RS485 board is connected to the standard regulated power supply and the program-controlled regulated power supply; The contact switch is connected to the standard regulated power supply or the program-controlled regulated power supply; the contact switch is connected to the external power supply monitor; The IO board and the DA board are used to provide the working condition simulation signal to the external power supply monitor; the IO board is also used to control the signal switching module to perform power switching operation through the relay module; The AD board is used to collect the protection disconnection timing starting point when the program-controlled voltage-stabilized power supply is switched and the time when the external power supply monitor is disconnected from the grid, and to collect the grid connection signal output by the external power supply monitor; The standard voltage-stabilized power supply is used to provide a normal voltage to the airborne equipment; the program-controlled voltage-stabilized power supply is used to provide a fault voltage to the airborne equipment; The external power supply monitor is used to detect the performance of the power supply connected to the onboard power grid; The method for automatically detecting the DC performance of the external power supply monitor comprises: The DA board and the IO board output working condition simulation signals to the external power supply monitor, so that the external power supply monitor is in a working ready state; The nth DC voltage value of the mth type fault voltage is set to the program-controlled voltage-stabilized power supply through the RS485 board, and the initial values ​​of m and n are 1; the first type fault voltage is a DC overvoltage fault voltage; the second type fault voltage is a DC undervoltage fault voltage; the program-controlled voltage-stabilized power supply is a program-controlled DC voltage-stabilized power supply; The IO board is used to control the signal switching module through the relay module to connect the standard regulated power supply to the external power supply monitor; the standard regulated power supply is a standard DC regulated power supply; Using the IO board to control the signal switching module through the relay module to connect the current program-controlled regulated power supply to the external power supply monitor, and using the AD board to collect the negative jump voltage of the standard DC voltage, and recording the time corresponding to the valley value of the negative jump voltage as the second timing starting point; Using the AD board to collect the grid-connected signal output by the external power supply monitor; Determine whether the voltage value of the grid-connected signal is less than the preset voltage value. If so, record the starting time when the voltage value of the grid-connected signal is less than the preset voltage value as the second timing end point; if not, return to the step of "collecting the grid-connected signal output by the external power supply monitor using an AD board card"; The second protection disconnection delay time is obtained by subtracting the time corresponding to the second timing starting point from the time corresponding to the second timing end point; Let n=n+1, and return to step "setting the nth DC voltage value of the mth type fault voltage to the program-controlled regulated power supply through the RS485 board card" until n reaches the first preset value; Let m=m+1, let n be the initial value, and return to step "setting the nth DC voltage value of the mth type fault voltage to the program-controlled regulated power supply through the RS485 board card" until m reaches the second preset value; The monitoring performance of the external power supply monitor on the DC power supply is judged according to all the obtained second protection disconnection delay times.

7. The method for automatically detecting the DC performance of an external power supply monitor according to claim 6, characterized in that: Before the step of "using the IO board to control the signal switching module through the relay module to connect the current program-controlled regulated power supply to the external power supply monitor", it also includes: Determine whether the grid-connected signal output by the external power supply monitor when connected to the standard regulated power supply is valid; If valid, proceed to step "using the IO board to control the signal switching module through the relay module to connect the current program-controlled regulated power supply to the external power supply monitor"; If it is invalid, a reset control signal is first sent to the external power monitor through the IO board to restore the external power monitor to a normal working state.

8. The method for automatically detecting the DC performance of an external power supply monitor according to claim 6, characterized in that: The n DC voltage values ​​of the DC overvoltage fault voltage include: 31.5V, 36V, 41V, 46V and 51V in sequence; The n DC voltage values ​​of the DC undervoltage fault voltage include: 19.5V, 17V, 13V, 7.5V, and 1.5V in sequence.

9. The method for automatically detecting the DC performance of an external power supply monitor according to claim 6, characterized in that: The working condition simulation signal includes providing a 27V external power supply monitor working voltage, a DC power supply switch terminal connected, an AC voltage switch terminal connected, and a port not connected when the engine is not in the starting state.

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