Avionics start control system and device for maintenance simulation training

Abstract

The invention belongs to the technical field of avionics, and discloses an avionics start control system for maintenance simulation training, which comprises a main control unit, an input acquisition module, a light control module, a current sampling module, a communication module and a power supply module, the input acquisition module comprises a plurality of input channels, a multi-gear dial switch, a reset button and a function matrix key, and all the input channels are connected with the main control unit through a photoelectric coupler; the light control module is used for controlling the lightening state and brightness of key backlight and function indicator lamps, and independent adjustment of multiple paths of light is realized by combining an LED array with a PWM dimming loop; the current sampling module is arranged in an LED driving loop, the driving current is detected in real time through the current sampling module, and a detection result is transmitted to the main control unit; and the communication module realizes data transmission with an upper computer based on an RS485 protocol. The control system has the advantages of being more stable in communication, more accurate in dimming and suitable for complex training environments.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of avionics, and particularly relates to an avionics starting control system for maintenance simulation training. BACKGROUND

[0002] In a maintenance simulation training system, a light and button control system plays a vital role, which is not only used for indicating a state, but also used for simulating an operation feedback of a real aviation environment. An existing similar device mainly includes a simulated cockpit (maintenance training) panel with a button input, a display output and a knob control function, controls are realized through a traditional level signal, signals are transmitted to an upper computer control system through a multi-core cable, the control system directly accesses a single-chip microcomputer GPIO through a button array, button states are collected through polling or interruption, a conventional direct current power supply LED is used for light prompting, a simple switch or a relay is controlled, a resistance voltage division control or an analog potentiometer adjustment is mostly used for backlight adjustment, parallel signal lines or a lower stability serial mode is used for data transmission between the upper computer and the panel, and the system lacks a feedback collection and real-time light adjustment control ability of a current signal.

[0003] Therefore, the prior art has the following limitations in practical application: 1. Signal anti-interference ability is weak. Most existing products use parallel level signal connection, and do not perform optical coupling isolation processing. In a high interference power supply environment, the signal is easily affected by electromagnetic interference, resulting in significant signal distortion. 2. Light control function is single. In the existing system, the control of buttons or indicator lights usually adopts switch on-off or relay control, and it is difficult to realize fine backlight brightness adjustment and remote control, which limits the simulation effect of the brightness transition demand in the real cockpit (maintenance simulation training) environment. 3. Light adjustment mode is lagging. The traditional analog potentiometer or resistance voltage division adjustment circuit has problems such as non-linear control, large temperature drift influence and insufficient adjustment precision, and it is difficult to meet the demand of high stability brightness control. 4. Lack of current feedback mechanism. Most systems do not have current collection capability, cannot form a closed loop control, and lack of brightness state information transmission. 5. Communication interface is unstable. The use of TTL level communication is easy to be disturbed, and the transmission distance is limited, which is difficult to meet the demand of long distance and real-time control in the training system.

[0004] In summary, the prior art has certain limitations in terms of “multi-function control, stable communication, adjustable brightness, strong anti-interference ability and state feedback”. Therefore, it is necessary to design an electronic starting control system and device with a more compact structure, more complete function, more stable communication, more accurate light adjustment and adaptation to complex training environment, so as to improve the interaction experience and reliability of the maintenance simulation training system. SUMMARY

[0005] The application aims to provide an avionics starting control system and device for cabin crew simulation training, which is more compact in structure, more complete in function, more stable in communication, more accurate in dimming and more adaptable to complex training environment. An avionics starting control system for cabin crew simulation training comprises a master control unit, and an input collection module, a light control module, a current sampling module, a communication module and a power module connected with the master control unit, wherein: The input collection module comprises multiple input channels, multiple dial code switches, a reset button and a function matrix button, and all the input channels are connected with the master control unit through photoelectric couplers; The master control unit is responsible for processing input signals, generating light control instructions, analyzing current data and communicating with the upper computer; The light control module is used for controlling the lighting state and brightness of the button backlight and the function indicator light, and adopts LED arrays combined with PWM dimming circuits to realize independent adjustment of multiple light paths; The current sampling module is arranged in the LED driving circuit, and the driving current is detected in real time through the current sampling module, and the detection result is transmitted to the master control unit; The communication module realizes data transmission with the upper computer based on the RS485 protocol, and is used for duplex communication; The power module provides stable DC voltage output for the system.

[0006] Further, an isolation protection circuit is further included, which is located between the input collection module and the master control unit, and realizes electrical isolation by using photoelectric coupler devices.

[0007] Further, the multiple dial code switches and the function matrix buttons in the input collection module are connected to the photoelectric coupler input end through current limiting resistors, and the photoelectric coupler output end is connected to the digital input pin of the master control unit.

[0008] Further, the LED arrays in the light control module are controlled by row-column driving mode, the row driving signal is output by the master control unit, and the column driving signal is controlled by the MOS tube through PWM dimming.

[0009] Further, a constant current chip connected with the master control unit is further included, and the PWM dimming signal generated by the master control unit drives the constant current chip after photoelectric isolation, so as to adjust the brightness of the LED arrays.

[0010] Further, a temperature compensation circuit is further included, which is used in cooperation with the constant current chip to reduce the influence of environmental temperature change on the brightness of the LED by adjusting the reference current value.

[0011] Further, the current sampling module adopts a precision current sampling amplifier, and the output signal of the amplifier is transmitted to the master control unit through an ADC channel.

[0012] Further, the communication module realizes RS485 communication with the host computer based on the SN75176 transceiver, supports long-distance and high anti-interference data transmission.

[0013] Further, the power module adopts an isolation type DC-DC converter, supports an input voltage range of 18V-36V, adapts to common DC power supply systems of aviation platforms, and the input end of the power module is provided with a TVS transient suppression diode, an inductor filter and a rectifier diode for absorbing transient high-voltage pulses and smoothing the input voltage waveform.

[0014] An avionics starting control device for cabin crew simulation training adopts the avionics starting control system for cabin crew simulation training.

[0015] The avionics starting control system and device for cabin crew simulation training have the following advantages: 1. The anti-interference ability is significantly improved, and the signal acquisition is accurate and reliable. In the application, all switch and key input channels are electrically isolated through photoelectric couplers, and current limiting resistors and filter capacitors are matched at the input end to prevent external transient interference signals from entering the main control system. The design effectively suppresses the influence of static discharge, electromagnetic interference, power supply noise and the like commonly existing in aviation training environment on signal acquisition, and the system false trigger rate is reduced by more than 80% compared with the traditional non-isolation design. 2. The matrix type lamp control management and remote partition backlight adjustment function are realized. The row-column type LED control structure is adopted, combined with multi-path segment selection signal and PWM dimming mode, to realize independent control and brightness adjustment of up to sixteen or more buttons / indicator lights. Through communication linkage of the main control unit and the upper system, various display modes such as remote lighting, extinguishing, flickering and night mode switching of the key lights are realized, the real cabin operation environment is fully simulated, and the immersion and visibility of simulation training are improved. 3. The dimming circuit has high linearity and temperature compensation capability, and the brightness adjustment is more accurate and stable. The application introduces PT4115 constant current driving chip for PWM dimming, and adopts reference current adjustment circuit composed of LM334 constant current source and adjustable resistor, which has good linearity and temperature compensation characteristics. Experimental tests show that under the environmental temperature of-20 DEG C to 60 DEG C, the LED backlight current change amplitude is less than ± 5%, which is much better than the fluctuation amplitude of more than 20% of the traditional resistance voltage division dimming mode under the same temperature drift, which significantly improves the brightness stability of the system under all-weather training conditions. 4. With current sampling feedback mechanism, forming a closed-loop control system. Backlight control circuit integrated current sampling amplifier module (such as INA180), the LED drive current is sent into the main control unit ADC channel in real time, realizing dynamic brightness adjustment closed-loop feedback. This mechanism can monitor the light load state in real time, realize automatic adjustment of PWM output according to the environment or host computer instruction, ensure that the backlight brightness is always consistent with the preset target, effectively avoid the brightness deviation caused by voltage fluctuation, component aging and other factors; 5. The communication interface meets the industrial standard, ensuring long-distance high-reliability data transmission. RS485 differential communication interface is adopted, and SN75176 transceiver is matched to support multi-node device networking communication. This scheme can still operate stably under 30 meters of cable, and the baud rate can reach 115200bps, which is more than 10 times higher than the traditional TTL communication mode, greatly enhancing the applicability of the device in complex wiring and distributed deployment; 6. The input state and brightness state can be uploaded in real time, and the remote control instruction can be parsed. The main control unit realizes duplex communication with the upper system through protocol parsing. The system can periodically upload all input states, current sampling values, brightness levels and other operating parameters, which is convenient for upper computer monitoring and recording; At the same time, it can parse the control commands issued remotely to realize reset, dimming, key light state setting and other operation controls, improve the manageability and intelligent degree of the system; 7. The power module is adapted to the aviation power fluctuation and has complete protection function, the power supply of the application adopts WRB2405S-3WR3 isolation type DC-DC module, supports 18V-36V wide voltage input, and adapts to the common DC power supply system of aviation platform; At the same time, multiple protection designs such as TVS tube anti-surge, inductance filtering, capacitance voltage stabilization, rectification anti-reverse and the like are supplemented to ensure that the device still operates stably in extreme environments such as high voltage pulse and voltage transient. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The structure diagram of the aviation electronic starting control system for the maintenance simulation training of the application.

[0017] Figure 2 The input acquisition module schematic diagram of the aviation electronic starting control system for the maintenance simulation training of the application.

[0018] Figure 3 The LED control module schematic diagram of the aviation electronic starting control system for the maintenance simulation training of the application.

[0019] Figure 4 The PT4115 constant current drive chip circuit diagram in the backlight constant current control module of the aviation electronic starting control system for the maintenance simulation training of the application.

[0020] Figure 5 The RS-485 communication interface circuit diagram of the SN75176 chip in the avionics starting control system for the maintenance simulation training of the application.

[0021] Figure 6 The power input circuit diagram of the avionics starting control system for the maintenance simulation training of the application.

[0022] Figure 7 The LED brightness control circuit diagram of the avionics starting control system for the maintenance simulation training of the application.

[0023] Figure 8 The main control unit circuit diagram of the avionics starting control system for the maintenance simulation training of the application.

[0024] Figure 9 The circuit diagram of the flat display and lower display control switch in the avionics starting control system for the maintenance simulation training of the application. DETAILED DESCRIPTION

[0025] In order to better understand the purpose, structure and function of the application, the avionics starting control system and device for the maintenance simulation training of the application are described in detail below in combination with the drawings.

[0026] As shown in Figure 1 , the device includes a main control unit 1, an input acquisition module, an LED control module, a backlight constant current control module, a current feedback sampling module, a communication interface module and a power module. These modules are connected through circuits to form a complete system, which collectively completes functions such as signal acquisition, light control, state feedback and communication. The specific composition, connection relationship and working principle of each module are as follows: The input acquisition module is the basis of the entire system, and its main function is to acquire the state of input devices such as the dial switch 3 and the function matrix key 4, and transmit the acquired signals to the main control unit 1. As shown in Figure 2 , the dial switch 3 and the function matrix key 4 are respectively connected to the main control unit 1 through the photoelectric coupler 2. The input end of the photoelectric coupler 2 is connected in series with a current limiting resistor, and the output end is directly connected to the digital input pin (PA, PB, PC, etc.) of the main control unit 1. This design achieves electrical isolation, effectively suppressing the influence of electrostatic discharge and electromagnetic interference. In actual operation, when the dial switch 3 is switched to a certain gear or the function matrix key 4 is pressed, the photoelectric coupler 2 will transmit the corresponding electrical signal to the main control unit 1, and the main control unit 1 will acquire the state of these switch signals in real time through the digital input pin.

[0027] As shown in Figure 8As shown, the master control unit adopts ATmega128A-AU series single-chip microcomputer as the core controller, is responsible for scanning of all input states, generation of light control signals, collection and analysis of current data, and protocol analysis of upper computer communication data and issuance of response control instructions, the master control unit 1 adopts a software filtering algorithm, continuously collects 10 signal levels, removes the maximum and minimum values, and averages the remaining 8 values, and takes the average value as the final collected signal level state. This processing method ensures the stability of the signal collection process and avoids false triggering caused by external interference. In addition, two 10pF capacitors C1 and C3 are used in the circuit, which are connected between VCC and GND respectively for filtering, ensuring stable voltage supply to other components, reducing noise interference, the RST pin is pulled up to VCC through a 10KΩ resistor R46, and an external reset button is connected to the RESET pin, which ensures that the microcontroller can be reliably reset when needed, the circuit includes a 16MHz crystal oscillator Y1 and its two 22pF capacitors C45 and C46, which provide the microcontroller with an accurate clock signal, in order to improve the accuracy of signal collection. Figure 8 The pin bits in the range of 10 to 64.

[0028] The LED control module is responsible for controlling the lighting state and brightness adjustment of the key backlight and function indicator light. As shown in Figure 3 and Figure 7 As shown, the LED array 5 forms a row-column control matrix through multi-segment selection control signals and PWM brightness control signals, each LED lamp has a corresponding optocoupler (such as U6, U7, U9, etc.) and a triode (such as Q1), which is controlled through different PWM signal channels, and the brightness of each LED lamp can be adjusted according to needs, suitable for application scenarios requiring multi-point lighting control. The upper end is connected to the segment drive channel (DO0~DO4) controlled by the master control unit 1, and the lower end is driven by the MOS tube 6 to control the PWM dimming. The PWM signal output by the master control unit 1 drives the DIM pin of the constant current drive chip 7 through the optocoupler 2, thereby realizing stepless dimming of the LED backlight array. In addition, the optocoupler transmits electrical signals through optical signals, achieving electrical isolation between the input side and the output side, preventing power interference and voltage fluctuations from affecting the control circuit, and improving the stability and safety of the system. The circuit includes a button control part for manually adjusting the brightness of the LED, when the button is pressed, the duty cycle of the PWM signal is changed through the resistor voltage dividing network, thereby adjusting the brightness of the LED, providing a user-friendly operation interface, and facilitating users to manually adjust the brightness of the LED according to needs.

[0029] In practical applications, the main control unit 1 generates corresponding PWM signals according to the collected input signal states and sends them to the LED control module. For example, when the dial switch 3 is in a specific gear and the function matrix key 4 is pressed, the main control unit 1 outputs a low-level signal to turn off the key backlight and light up the function indicator light; when the dial switch 3 is in other gears and the function matrix key 4 is not pressed, the main control unit 1 outputs a PWM signal to make the key backlight low brightness. This control method based on PWM dimming can realize independent control and brightness adjustment of multiple buttons and indicator lights, meeting the diversified needs in complex training environments.

[0030] As shown in Figure 4 The backlight constant current control module uses PT4115 constant current drive chip 7 to adjust the output current through internal feedback mechanism and external sampling resistor R44. When the LED current changes, the chip automatically adjusts the PWM duty cycle to maintain a constant current value, ensuring that the LED can obtain a stable 80mA current under different voltage, temperature and other conditions, thereby ensuring the consistency of LED brightness and life. The DIM pin receives external PWM signals to achieve precise dimming. The PWM signal is transmitted to the DIM pin after electrical isolation by the optocoupler 2, ensuring safe isolation between digital control and high-voltage drive. In addition, the module also includes a filter inductor and capacitor to improve the stability of the LED backlight drive circuit. L2 acts as an energy storage element, storing energy during the switching period and releasing it to the LED during the off period, which helps to improve energy conversion efficiency. Compared with linear voltage stabilizers, switching power supplies have higher efficiency, reducing heat generation and prolonging the service life of the system.

[0031] In actual operation, the main control unit 1 generates PWM signals according to the preset logic and transmits them to the DIM pin of the PT4115 constant current drive chip 7 through the optocoupler 2. The PT4115 chip adjusts the output current according to the received PWM signal, thereby controlling the brightness of the LED backlight. Due to the use of constant current drive technology, the brightness of the LED backlight can remain stable even in the case of voltage fluctuations or temperature changes. Experimental tests show that the LED backlight current variation is less than ±5% under an ambient temperature of -20°C to 60°C, which is significantly better than the traditional resistance voltage division dimming method.

[0032] The current feedback sampling module is set in the LED current path and uses INA series precision current sampling amplifiers to detect the LED drive current in real time. As shown in Figure 3As shown, the sampling amplifier sends the detected analog signal to the ADC module (such as ADC0) of the master control unit 1. The master control unit 1 adjusts the PWM output according to the deviation between the actual current value and the target set value, thereby realizing closed-loop brightness control. In actual operation, when the master control unit 1 detects that the LED driving current deviates from the target value, it will automatically adjust the duty cycle of the PWM signal to make the LED brightness return to the preset level. This closed-loop control mechanism can effectively deal with the brightness deviation problem caused by factors such as voltage fluctuation and component aging, and ensure that the backlight brightness is always consistent with the preset target.

[0033] As shown in Figure 5 As shown, the communication interface module realizes RS485 communication with the upper control system based on SN75176 transceiver 8. This module supports long-distance, high-anti-interference data transmission, and can meet the communication needs under complex electromagnetic interference conditions in analog training environment. The SN75176 chip integrates differential driver and receiver inside, which can convert single-ended signal to differential signal, and convert back to single-ended signal at the receiving end. Differential signal transmission can effectively eliminate common-mode noise and improve signal anti-interference ability, ensuring data integrity during long-distance transmission. The communication module is connected with the RO / DI pin of SN75176 through UART serial port, and its A / B interface is connected to RS485 communication bus, realizing bidirectional communication between the device and the host computer. In actual application, the master control unit 1 realizes duplex communication with the upper system through protocol analysis, periodically uploads all input states, current sampling values, brightness levels and other operating parameters, at the same time, the master control unit 1 can analyze the control commands issued remotely, realizing reset, dimming, key light state setting and other operation controls. This design not only improves the manageability and intelligence of the system, but also enhances the applicability of the device in complex wiring and distributed deployment.

[0034] It should be noted that the duplex communication in the present application also includes half-duplex communication.

[0035] As shown in Figure 6As shown, the power module adopts WRB2405S-3WR3 isolation DC-DC module 9 to convert the 24V (18~36V) DC power input into the 5V stable voltage required by the system, and provides overvoltage, reverse connection and other protection functions. The module supports a wide input range (18V~36V), and is provided with TVS transient suppression diode, capacitor filter and rectifier diode at the power input end to improve the surge resistance and power stability of the system in the aviation application environment. In actual operation, the power module first protects against surges through the TVS transient suppression diode, then performs inductance filtering and capacitor voltage stabilization processing, when the input voltage is too high or a short circuit occurs, the fuse will melt and cut off the power input to prevent subsequent circuit damage, when the input voltage is transient or surges, D2 can quickly conduct to clamp the excessive voltage within a safe range, effectively protecting the subsequent circuit from overvoltage damage and improving the safety of the system, when the power is reversed, D1 will be reverse-biased to block the current, thereby protecting the subsequent circuit from damage and improving the robustness of the system. Finally, the WRB2405S-3WR3 isolation DC-DC module 9 outputs stable 5V voltage. This multiple protection design ensures that the device still operates stably in extreme environments such as high voltage pulses and voltage transients.

[0036] In a specific application scenario, the workflow of the system is as follows: First, the input acquisition module collects the state signals of the dial switch 3 and the function matrix key 4 through the photoelectric coupler 2, and transmits these signals to the main control unit 1. The main control unit 1 performs software filtering processing on the received signals to ensure the accuracy of signal acquisition, and then generates corresponding control signals according to the preset logic to judge the state of the input signal. For example, when the dial switch 3 is in a specific gear and the function matrix key 4 is pressed, the main control unit 1 outputs a low-level signal to turn off the key backlight and turn on the function indicator light; when the dial switch 3 is in other gears and the function matrix key 4 is not pressed, the main control unit 1 outputs a PWM signal to make the key backlight low. At the same time, the main control unit 1 monitors the LED driving current in real time through the current feedback sampling module, and adjusts the PWM output according to the deviation between the actual current value and the target set value to realize closed-loop brightness control. In addition, the main control unit 1 communicates with the upper system through the communication interface module, periodically uploads all input states, current sampling values, brightness levels and other operating parameters, and parses the control commands issued remotely to realize reset, dimming, key light state setting and other operation controls. In the entire running process, the power module provides stable 5V working voltage for all parts of the system to ensure stable operation of the device in a complex electromagnetic environment.

[0037] It can be seen from the above specific embodiments that the present application realizes high-reliability input signal acquisition, precise brightness adjustment, stable communication and remote control and other functions through input isolation, light-adjusting closed-loop control, current feedback sampling, RS485 communication and anti-interference power supply design and other innovative combinations, has obvious technical progress and practical application value, and is particularly suitable for use in a high-precision and high-simulation requirement maintenance simulation training control system.

[0038] As shown in Figure 9 two independent switches S27 and S28 are used to control the LED backlight of the "flat display" and "lower display" areas respectively. Users can adjust the backlight state of these two areas individually according to their needs without affecting the other area. Each switch provides two mode selections, "DAY" and "NIGHT", corresponding to the brightness levels in daytime and nighttime. For example, the S27 switch has DAY1 and NIGHT1 positions, while the S28 switch has DAY2 and NIGHT2 positions, which allows users to select the appropriate brightness according to the current light conditions to achieve the best visual experience. In addition to manually selecting the "DAY" or "NIGHT" mode, each switch also provides an "AUTO" position. When the switch is in the "AUTO" position, the system will automatically adjust the backlight brightness according to the external light sensor or other preset conditions, further simplifying the user's operation. The flat display and lower display control switches can realize independent control of the LED backlight of different areas and support two brightness level presets for daytime and nighttime, combined with the issuance of instructions by the upper computer for linkage adjustment, which can meet the use requirements in different visual environments.

[0039] The present application also provides an aviation electronic starting control device for maintenance simulation training, which is composed of multi-gear dial switches, reset buttons, function matrix keys, etc. All input channels are connected to the main control unit through photoelectric couplers to realize isolated collection of input signals. The device uses the aviation electronic starting control system for maintenance simulation training described above. In this device, the input interface uses a pluggable connector and number identification design, which facilitates quick deployment and maintenance. In addition, the input / output signals are defined through a unified interface, which facilitates equipment maintenance and replacement, reduces the probability of manual connection errors, and is suitable for the quick deployment requirements of training systems.

[0040] The aviation electronic starting control system and device for maintenance simulation training of the present application have the following advantages: 1. Significantly improve the anti-interference ability, ensure the accuracy and reliability of signal acquisition. The application electrically isolates all switch and button input channels through photoelectric coupler, and matches current limiting resistor and filter capacitor at the input end to prevent external transient interference signals from entering the main control system. This design effectively suppresses the influence of static discharge, electromagnetic interference, power noise and other factors on signal acquisition in the aviation training environment. Compared with the traditional non-isolated design, the system false trigger rate is reduced by more than 80%; 2. Realize matrix light control management and remote partition backlight adjustment function. Using row-column LED control structure, combined with multi-path selection signal and PWM dimming method, up to sixteen buttons / indicator lights can be independently controlled and brightness adjusted. Through the communication linkage between the main control unit and the upper system, the remote lighting, extinguishing, flickering and night mode switching of the key light can be realized, and various display modes can be realized, such as simulating the real operation environment of the crew, improving the immersion and visibility of the simulation training; 3. The dimming circuit has high linearity and temperature compensation ability, and the brightness adjustment is more accurate and stable. The application introduces PT4115 constant current drive chip to cooperate with PWM dimming, and uses LM334 constant current source and adjustable resistor to form a reference current adjustment circuit, which has good linearity and temperature compensation characteristics. Experimental tests show that under the environmental temperature of-20℃ to 60℃, the LED backlight current change amplitude is less than ±5%, which is much better than the traditional resistance voltage division dimming method with a fluctuation amplitude of more than 20% under the same temperature drift, which significantly improves the brightness stability of the system under all-weather training conditions; 4. It has current sampling feedback mechanism and forms a closed-loop control system. The backlight control circuit integrates current sampling amplification module (such as INA180), which sends the LED driving current to the main control unit ADC channel in real time, realizing dynamic brightness adjustment closed-loop feedback. This mechanism can monitor the light load state in real time, realize automatic adjustment of PWM output according to the environment or upper computer instruction, ensure that the backlight brightness is always consistent with the preset target, and effectively avoid the brightness deviation caused by voltage fluctuation, component aging and other factors; 5. The communication interface meets the industrial standard, ensuring long-distance and high-reliability data transmission. RS485 differential communication interface is adopted, and SN75176 transceiver is matched to support multi-node device networking communication. This scheme can still run stably under 30 meters of cable, and the baud rate can reach 115200bps, which is more than 10 times higher than the traditional TTL communication method, greatly enhancing the applicability of the device in complex wiring and distributed deployment; 6、 Input state, brightness state can be uploaded in real time, and remote control instruction analysis is supported. The main control unit realizes duplex communication with the upper system through protocol analysis. The system can periodically upload all current input states, current sampling values, brightness levels and other operating parameters, so as to facilitate the monitoring and recording of the upper computer; meanwhile, the control commands issued remotely can be analyzed, so as to realize reset, dimming, key light state setting and other operation controls, and improve the manageability and intelligent degree of the system. 7、The power module is adapted to aviation power fluctuation, and has complete protection function, the WRB2405S-3WR3 isolation type DC-DC module is adopted in the power supply design of the application, 18V-36V wide voltage input is supported, and the common DC power supply system of the aviation platform is adapted; meanwhile, multiple protection designs such as TVS pipe anti-surge, inductance filtering, capacitor voltage stabilization, rectification anti-reverse and the like are supplemented, so that the equipment can still stably operate in the extreme environment of high voltage pulse, voltage transient and the like.

[0041] The above-mentioned "above", "below", "within" include the number; the "more than", "outside" do not include the number.

[0042] The above is further described by means of specific embodiments, but it should be understood that the specific description herein should not be understood as limiting the essence and scope of the application, and various modifications made by those skilled in the art after reading the above description also belong to the scope of protection of the application. In the above specific embodiments, various specific technical features described above can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, various possible combinations of the embodiments of the application are not described again.

[0043] If the embodiments of the application involve directional indications (such as up, down, left, right, front, back, …), the directional indications are only used to explain the relative position relationship, motion condition and the like between components in a certain specific posture (as shown in the drawings), if the specific posture changes, the directional indications also change accordingly.

Claims

1. An avionics start-up control system for line maintenance simulation training, characterized in that, The system comprises a master control unit, an input acquisition module, a light control module, a current sampling module, a communication module and a power module connected with the master control unit, wherein: The input acquisition module comprises multiple input channels, multiple dial code switches, a reset button and a function matrix button, and all the input channels are connected with the master control unit through photoelectric couplers; The master control unit is responsible for processing input signals, generating light control instructions, analyzing current data and communicating with the upper computer; The light control module is used for controlling the lighting state and brightness of the button backlight and the function indicator light, and adopts LED array combined with PWM dimming circuit to realize independent adjustment of multiple light paths; The current sampling module is arranged in the LED drive circuit, and the driving current is detected in real time through the current sampling module, and the detection result is transmitted to the master control unit; The communication module realizes data transmission with the upper computer based on RS485 protocol, and is used for duplex communication; The power module provides stable DC voltage output for the system.

2. The avionics start-up control system for line- maintenance simulation training of claim 1, wherein, The system further comprises an isolation protection circuit, which is located between the input acquisition module and the master control unit and realizes electrical isolation through optical coupler devices.

3. The avionics start-up control system for line- maintenance simulation training of claim 1, wherein, The multiple dial code switches and the function matrix buttons in the input acquisition module are connected to the input end of the optical coupler through current limiting resistors, and the output end of the optical coupler is connected to the digital input pin of the master control unit.

4. The avionics start-up control system for line maintenance simulation training of any one of claims 1 to 3, wherein, The LED array in the light control module is controlled by row-column driving mode, the row driving signal is output by the master control unit, and the column driving signal is controlled by the MOS tube through PWM dimming.

5. The avionics start-up control system for line- maintenance simulation training of claim 4, wherein, The system further comprises a constant current chip connected with the master control unit, and the PWM dimming signal generated by the master control unit drives the constant current chip after optical coupling isolation, so as to adjust the brightness of the LED array.

6. The avionics start-up control system for line- maintenance simulation training of claim 5, wherein, The system further comprises a temperature compensation circuit, which is used in cooperation with the constant current chip to reduce the influence of environmental temperature change on the brightness of the LED by adjusting the reference current value.

7. The avionics start-up control system for line- maintenance simulation training of claim 1, wherein, The current sampling module adopts a precision current sampling amplifier, and the output signal of the amplifier is transmitted to the master control unit through an ADC channel.

8. The avionics start-up control system for line- maintenance simulation training of claim 1, wherein, The communication module realizes RS485 communication with the upper computer based on SN75176 transceiver, supports long-distance and high anti-interference data transmission.

9. The avionics start-up control system for line- maintenance simulation training of claim 1, wherein, The power module adopts an isolation type DC-DC converter, supports an input voltage range of 18V-36V, adapts to the common DC power supply system of the aviation platform, and the input end of the power module is provided with a TVS transient suppression diode, an inductor filter and a rectifier diode for absorbing transient high voltage pulses and smoothing the input voltage waveform.

10. An avionics start-up control device for line maintenance simulation training, characterized in that, The aviation electronic starting control system for maintenance simulation training is used. The aviation electronic starting control system for maintenance simulation training is used.

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