A multi-level adaptive anti-interference digital signal input device

Abstract

The present invention provides a multi-level adaptive anti-interference digital signal input device, comprising: an electromagnetic compatibility module for suppressing the amplitude of high-frequency signals and high-frequency overvoltage spikes of the received original digital signal to obtain a first digital signal; a first digital signal isolation module for optically isolating and level-converting the received first digital signal to obtain a target level digital signal; a filter level control module for performing digital filtering processing on the received target level digital signal to obtain a target anti-interference digital signal; the filter level control module is further configured to correspondingly output a target control signal based on the level of the original input voltage, and then isolate and transmit the target control signal through a second digital isolation module to a multi-level adaptation module to perform the on-off operations of each switching device, thereby realizing the adaptive control of multiple levels of the original digital signal, and thus realizing the reliable and stable operation of the digital input port in a complex electromagnetic environment.

Description

Technical Field

[0001] The present invention relates to the technical field of rail transit, and particularly to a multi-level adaptable anti-interference digital signal input device. Background Art

[0002] In a vehicle controller in rail transit, a large number of digital signals from various sensors, switches, and other controllers usually need to be processed. Since the voltage levels of these digital signals adopt standard levels adapted to the level requirements of the vehicle type, a signal conversion circuit needs to be designed to obtain the required level of the digital signal.

[0003] However, when facing the level requirements of different vehicle types, different signal conversion circuits usually need to be designed, which results in limited application scope and reduced generality of vehicles in rail transit. Summary of the Invention

[0004] The present invention provides a multi-level adaptable anti-interference digital signal input device to solve the problems of limited application scope and reduced generality of vehicles caused by designing different signal conversion circuits for different level requirements, and to achieve flexible and reliable acquisition of the required level of digital signals.

[0005] The present invention provides a multi-level adaptable anti-interference digital signal input device, including: an electromagnetic compatibility module, a multi-level adaptation module, a first digital signal isolation module, a second digital signal isolation module, and a filtering level control module; wherein, a first input end and an output end of the multi-level adaptation module are respectively connected to an output end of the electromagnetic compatibility module and an input end of the first digital isolation module, an input end and an output end of the filtering level control module are respectively connected to an output end of the first digital isolation module and an input end of the second digital isolation module, and an output end of the second digital isolation module is connected to a second input end of the multi-level adaptation module;

[0006] The electromagnetic compatibility module is configured to suppress the amplitude of high-frequency signals and high-frequency overvoltage spikes of the received original digital signal to obtain a first digital signal; the first digital signal isolation module is configured to perform optical isolation and level conversion on the received first digital signal to obtain a target-level digital signal; the filtering level control module is configured to perform digital filtering processing on the received target-level digital signal to obtain a target anti-interference digital signal; the filtering level control module is further configured to correspondingly output a target control signal based on the level of the original input voltage, and then isolate and transmit the target control signal to the multi-level adaptation module through the second digital isolation module to perform on-off operations of each switching device, so as to realize adaptive control of multiple levels of the original digital signal.

[0007] A multi-level adaptive anti-interference digital signal input device provided by the present invention, wherein the electromagnetic compatibility module includes a first resistor, a capacitor and a transient voltage suppression diode; wherein, a node formed by connecting one end of the transient voltage suppression diode and one end of the first resistor serves as an input end of the original digital signal and the original input voltage; a node formed by connecting the other end of the first resistor and one end of the capacitor is connected to the positive input end of the first digital signal isolation module; the other end of the transient voltage suppression diode and the other end of the capacitor are both grounded.

[0008] A multi-level adaptive anti-interference digital signal input device provided by the present invention, wherein the electromagnetic compatibility module further includes a diode; wherein, a node formed by connecting the other end of the first resistor and one end of the capacitor is connected to the positive electrode of the diode; the negative electrode of the diode is connected to the positive input end of the first digital signal isolation module.

[0009] A multi-level adaptive anti-interference digital signal input device provided by the present invention, wherein the multi-level adaptive module includes three series-connected switching devices, and each of the switching devices is shunted by a resistor.

[0010] When the three series-connected switching devices are all triodes, the multi-level adaptive module includes a first triode, a second triode, a third triode, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a seventh resistor; wherein, the collector and emitter of the first triode are respectively connected to both ends of the third resistor, the collector and emitter of the second triode are respectively connected to both ends of the fifth resistor, and the collector and emitter of the third triode are respectively connected to both ends of the seventh resistor; a node connected by the fourth resistor and the sixth resistor is respectively connected to the gates of the first triode, the second triode and the third triode; the emitter of the first triode is connected to the collector of the second triode, the emitter of the second triode is connected to the collector of the third triode, and the emitter of the third triode is grounded; when the first triode, the second triode and the third triode are turned on, they respectively short-circuit the third resistor, the fifth resistor and the seventh resistor; one end of the fourth resistor is connected to the output end of the second digital isolation module, and the other end is connected to the sixth resistor; the other end of the sixth resistor is grounded.

[0011] According to a multi-level adaptive anti-interference digital signal input device provided by the present invention, when the first digital signal isolation module is a first optocoupler, the negative input terminal of the first optocoupler is connected to the collector of the first triode, the emitter of the first optocoupler is connected to the digital signal input terminal of the filter level control module, the collector of the first optocoupler is connected to the first optocoupler power supply, and the emitter of the first optocoupler is grounded.

[0012] According to a multi-level adaptive anti-interference digital signal input device provided by the present invention, when the second digital signal isolation module is a second optocoupler, the positive input terminal of the second optocoupler is connected to the digital signal output terminal of the filter level control module, the negative input terminal of the second optocoupler is grounded, and the collector of the second optocoupler is connected to the second optocoupler power supply.

[0013] According to a multi-level adaptive anti-interference digital signal input device provided by the present invention, the filter level control module includes a digital filter unit, and the algorithm in the digital filter unit includes one of a dead zone processing algorithm, a median filtering algorithm, a sliding filtering algorithm, and a low-pass filtering algorithm.

[0014] According to a multi-level adaptive anti-interference digital signal input device provided by the present invention, the switching device is a triode, a MOSFET, a relay, an IGBT, or a contactor.

[0015] The present invention also provides a rail transit vehicle control system, including the multi-level adaptive anti-interference digital signal input device described above.

[0016] The multi-level adaptive anti-interference digital signal input device provided by the present invention suppresses the amplitude of high-frequency signals and high-frequency overvoltage spikes of the received original digital signal through an electromagnetic compatibility module to obtain a first digital signal, and the first digital signal is optically isolated and level-converted through a first digital signal isolation module to obtain a target-level digital signal. Further, the target-level digital signal is filtered through a filter level control module to obtain a target anti-interference digital signal, thereby realizing the stable and reliable transmission of digital signals even in a complex electromagnetic environment. Further, by controlling the on and off of each switching device in the multi-level adaptive module through the target control signal output by the filter level control module based on the level of the original input voltage, the purpose of adaptive control of multiple levels of digital signals is achieved, thereby achieving the dual purposes of electromagnetic compatibility and stable and reliable transmission of digital signals. The design is simple and the cost is low, effectively improving the power supply stability and signal transmission reliability of the entire rail transit vehicle control system. Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the attached drawings required for the description of the embodiments or the prior art. Obviously, the attached drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other attached drawings can also be obtained based on these attached drawings.

[0018] Figure 1 It is a schematic diagram of a multi-level adaptive anti-interference digital signal input device provided by the present invention;

[0019] Figure 2 It is a schematic diagram of the circuit structure of a multi-level adaptive anti-interference digital signal input device provided by the present invention. Specific embodiments

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention in conjunction with the attached drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0021] Controllers in rail transit vehicles usually need to process a large number of digital signals from various sensors, switches, and other controllers. The voltage levels of these digital signals may adopt different standard levels according to the requirements of different vehicle types. If different signal conversion circuits are designed for different level requirements, it will be unfavorable for the general design of the product and limit the application scenarios of the product; in addition, the electromagnetic environment in rail transit is complex, resulting in signals being easily interfered.

[0022] Therefore, to solve the above problems, the present invention provides a multi-level adaptive anti-interference digital signal input device, as Figure 1 shown. The multi-level adaptive anti-interference digital signal input device includes: an electromagnetic compatibility module, a multi-level adaptation module, a first digital signal isolation module, a second digital signal isolation module, and a filtering level control module; wherein, the first input end and the output end of the multi-level adaptation module are respectively connected to the output end of the electromagnetic compatibility module and the input end of the first digital isolation module, the input end and the output end of the filtering level control module are respectively connected to the output end of the first digital isolation module and the input end of the second digital isolation module, and the output end of the second digital isolation module is connected to the second input end of the multi-level adaptation module.

[0023] The electromagnetic compatibility module is used to suppress the amplitude of high-frequency signals and high-frequency overvoltage spikes in the received original digital signal to obtain a first digital signal; the first digital signal isolation module is used to perform optical isolation and level conversion on the received first digital signal to obtain a target-level digital signal; the filtering level control module is used to perform digital filtering on the received target-level digital signal to obtain a target anti-interference digital signal; the filtering level control module is further used to output a target control signal corresponding to the level of the original input voltage, and then isolate and transmit the target control signal to the multi-level adaptation module through the second digital isolation module to perform the on-off operations of each switching device, so as to achieve the adaptive control of multiple levels of the original digital signal.

[0024] Specifically, the electromagnetic compatibility module can be an electromagnetic compatibility circuit. When the electromagnetic compatibility circuit suppresses the amplitude of high-frequency signals and high-frequency overvoltage spikes in the received original digital signal, a low-pass filter can be used to suppress the amplitude of high-frequency voltage signals or high-frequency current signals in the original digital signal, and a transient voltage suppression diode can be used to suppress high-frequency overvoltage spikes in the original digital signal. Further, the electromagnetic compatibility circuit also includes a diode, which is used to achieve circuit protection when reverse-connected.

[0025] The multi-level adaptation module can be a multi-level adaptation circuit, which includes multiple switching devices, and each of the multiple switching devices will conduct and cut off based on the target control signal; since the target control signal is transmitted to the multi-level adaptation module by the filtering level control module through the second digital signal isolation, the dual purposes of multi-level adaptive control and safety isolation can be achieved simultaneously.

[0026] The first digital signal isolation module is used to perform optical isolation and level conversion on the received first digital signal to obtain a target-level digital signal that meets the level requirements of the filtering level control module. For example, the target-level digital signal can be a 0V-level digital signal or a 3.3V-level digital signal; the second digital isolation module is used to perform optical isolation on the received target control signal for safe isolation transmission.

[0027] Both the first digital signal isolation module and the second digital signal isolation module can use optocouplers or digital isolation chips. When both the first digital signal isolation module and the second digital signal isolation module use optocouplers, they also have a common-mode interference suppression function. The reason is that the optocoupler isolates the input and output electrical signals; and the input end of the optocoupler belongs to a low-resistance element operating in a current mode, so it has a strong common-mode suppression ability; in addition, the optocoupler transmits a voltage difference signal, so the common-mode signal cannot be transmitted through the optocoupler; the optocoupler has a bandwidth limit, and differential-mode interference with a frequency higher than the bandwidth limit will be suppressed.

[0028] The filtering level control module has a digital filtering function and a level adaptation control function. The digital filtering function can be realized by the digital filtering unit set in the filtering level control module, and the level adaptation control function can realize the adaptive function of multiple levels of the original digital signal according to the target control signal output corresponding to the level of the original input voltage. Among them, the target control signal is used to control the on and off of each switching device in the multi-level adaptation module, and the algorithms in the digital filtering unit include one of the dead zone processing algorithm, median filtering algorithm, sliding filtering algorithm, and low-pass filtering algorithm.

[0029] The multi-level adaptation anti-interference digital signal input device provided by the present invention obtains the first digital signal after suppressing the amplitude of the high-frequency signal and the high-frequency overvoltage spike of the received original digital signal through the electromagnetic compatibility module, and the first digital signal is optically isolated and level-converted by the first digital signal isolation module to obtain the target level digital signal, and the target level digital signal is filtered by the filtering level control module to obtain the target anti-interference digital signal, so as to achieve the purpose of stable and reliable transmission of digital signals even in a complex electromagnetic environment. Further, by controlling the on and off of each switching device in the multi-level adaptation module through the target control signal output corresponding to the level of the original input voltage by the filtering level control module, the purpose of adaptive control of multiple levels of digital signals is realized, so as to achieve the dual purposes of electromagnetic compatibility and stable and reliable transmission of digital signals. The design is simple and the cost is low, effectively improving the power supply stability and signal transmission reliability of the entire rail transit vehicle control system.

[0030] The present invention also provides a circuit structure schematic diagram of a multi-level adaptation anti-interference digital signal input device. When the first digital signal isolation module is the first optocoupler and the second digital signal isolation module is the second optocoupler, as Figure 2 shown, the multi-level adaptation anti-interference digital signal input device includes: an electromagnetic compatibility circuit, a multi-level adaptation circuit, a first optocoupler J1, a second optocoupler J2, and a filtering level control circuit, where:

[0031] The filtering level control circuit has a digital signal input port DDIA and a digital signal output port LevelEn, and a digital filtering unit is built in the filtering level control circuit.

[0032] The electromagnetic compatibility circuit consists of a first resistor R1, a capacitor C1, a transient voltage suppression diode DR1, and a diode D1. The connection relationships are as follows: The node formed by connecting one end of the transient voltage suppression diode DR1 and one end of the first resistor R1 serves as the input terminal DIn for the original digital signal and the original input voltage. The node formed by connecting the other end of the first resistor R1 and one end of the capacitor C1 is connected to the positive electrode of the diode D1. The other end of the transient voltage suppression diode DR1 and the other end of the capacitor C1 are both grounded. The negative electrode of the diode D1 is connected to the positive input terminal of the first optocoupler J1. Among them, the transient voltage suppression diode DR1 is used to suppress voltage spikes in the original digital signal. The first resistor R1 and the capacitor C1 form a low-pass filter, and the low-pass filter is used to suppress the amplitude of high-frequency components in the original digital signal. The diode D1 is used to protect other components from damage when reverse-connected.

[0033] When the multilevel adaptation circuit includes three series-connected switching devices, and each switching device is respectively connected in parallel with a resistor, the multilevel adaptation circuit can consist of a first triode Q1, a second triode Q2, a third triode Q3, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7. The connection relationships are as follows: The collector and emitter of the first triode Q1 are respectively connected to both ends of the third resistor R3. The collector and emitter of the second triode Q2 are respectively connected to both ends of the fifth resistor R5. The collector and emitter of the third triode Q3 are respectively connected to both ends of the seventh resistor R7. The node where the fourth resistor R4 and the sixth resistor R6 are connected is respectively connected to the gates of the first triode Q1, the second triode Q2, and the third triode Q3. The emitter of the first triode Q1 is connected to the collector of the second triode Q2. The emitter of the second triode Q2 is connected to the collector of the third triode Q3. The emitter of the third triode Q3 is grounded. When the first triode Q1, the second triode Q2, and the third triode Q3 are conducting, they respectively short-circuit the third resistor R3, the fifth resistor R5, and the seventh resistor R7, thereby changing the magnitude of the grounding resistance of the negative input terminal of the first optocoupler J1. One end of the fourth resistor R4 is connected to the emitter output terminal of the second optocoupler J2, and the other end is connected to the sixth resistor R6. The other end of the sixth resistor R6 is grounded. The fourth resistor R4 and the sixth resistor R6 can serve as the gate drive circuits for the first triode Q1, the second triode Q2, and the third triode Q3.

[0034] The negative input terminal of the first optocoupler J1 is connected to the collector of the first triode Q1. The emitter of the first optocoupler J1 is connected to the digital signal input terminal DDIA of the filter level control circuit. The collector of the first optocoupler J1 is connected to the first optocoupler power supply. The emitter of the first optocoupler J1 is grounded through the second resistor R2. Among them, the first optocoupler J1 is used to isolate the original digital signal from the filter level control circuit, convert the original digital signal into a TTL-level digital signal or a CMOS-level digital signal that meets the requirements of the filter level control circuit, and suppress the common-mode interference in the original digital signal; the first optocoupler power supply is Figure 2 The 3.3V power supply in. Optionally, the TTL-level digital signal or the CMOS-level digital signal can both be a 3.3V-level digital signal or a 0V-level digital signal.

[0035] The positive input terminal of the second optocoupler J2 is connected to the digital signal output terminal LevelEn of the filter level control circuit. The negative input terminal of the second optocoupler J2 is grounded. The collector of the output terminal of the second optocoupler J2 is connected to the second optocoupler power supply; among them, the second optocoupler power supply is Figure 2 The 5V power supply in; the second optocoupler J2 is used to optically isolate the target control signal.

[0036] Specifically, based on Figure 2For the shown circuit diagram, the working principle of the device of the present invention is as follows: The original digital signal is input into the electromagnetic compatibility circuit for filtering high-frequency voltage signals or current signals, suppressing high-frequency overvoltage spikes, and protecting the circuit during reverse connection, thereby obtaining the first digital signal; the first digital signal is input into the first optocoupler J1 for optical isolation and level conversion to obtain a 0V level digital signal or a 3.3V level digital signal that meets the requirements of the filtering level control circuit, and then the 0V level digital signal or the 3.3V level digital signal is input into the filtering level control circuit for digital filtering processing to finally obtain the target anti-interference digital signal, and the target anti-interference digital signal is the signal after interference filtering; among them, the first digital signal enters the first optocoupler J1 for optical isolation and level conversion when the first optocoupler J1 is turned on, and the conduction of the first optocoupler J1 for adapting to the level of the original input voltage DIn is realized by the filtering level control circuit controlling the on and off of each triode in the multi-level adaptation circuit, specifically including: when the original input voltage DIn adopts a low-level grade, the filtering level control circuit outputs a control signal LevelEn representing a high level to make each triode in the multi-level adaptation circuit conduct. At this time, the series resistance of the primary side of the first optocoupler J1 becomes smaller, and the first optocoupler J1 can be normally turned on when the amplitude of the original input voltage DIn is a high level; when the original input voltage DIn adopts a high-level grade, the filtering level control circuit outputs a target control signal LevelEn representing a low level to make each triode in the multi-level adaptation circuit cut off. At this time, the series resistance of the primary side of the first optocoupler J1 becomes larger, and the first optocoupler J1 can be normally turned on when a relatively high-amplitude original input voltage DIn is input. Then, the target control signal LevelEn output by the filtering level control circuit is isolated and transmitted through the second optocoupler J2 to the multi-level adaptation circuit for controlling the on and off of each triode, thereby realizing safety isolation and adaptive control.

[0037] The circuit of the multi-level adaptation anti-interference digital signal input device provided by the present invention not only realizes the purpose of suppressing interference on the original digital signal by designing an electromagnetic compatibility circuit in the signal path and designing a digital filter in the filtering level control module, but also can realize the purpose of having the ability to adapt to multiple levels of the original digital signal by forming basic units by paralleling switching devices and resistors, connecting multiple basic units in series, and controlling the on and off of the switching devices. As a result, the present invention can not only be applicable to the input ports of various sensors and switches and has versatility, but also can realize the reliable and stable operation of the digital input port in a complex electromagnetic environment through the electromagnetic compatibility and protection design of the entire signal path.

[0038] The present invention also provides a rail transit vehicle control system, which includes the multi-level adaptive anti-interference digital signal input device described in the foregoing embodiments; the multi-level adaptive anti-interference digital signal input device included in the rail transit vehicle control system can be correspondingly referred to the multi-level adaptive anti-interference digital signal input device described above, and details are not described herein again.

[0039] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0040] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of each embodiment of the present invention.

Claims

1. A multi-level adaptive anti-interference digital signal input device, characterized in that, Comprising: An electromagnetic compatibility module, a multilevel adaptation module, a first digital signal isolation module, a second digital signal isolation module, and a filter level control module; wherein, a first input end and an output end of the multilevel adaptation module are respectively connected to an output end of the electromagnetic compatibility module and an input end of the first digital isolation module, an input end and an output end of the filter level control module are respectively connected to an output end of the first digital isolation module and an input end of the second digital isolation module, and an output end of the second digital isolation module is connected to a second input end of the multilevel adaptation module; The electromagnetic compatibility module is configured to suppress the amplitude of high-frequency signals and high-frequency overvoltage spikes of the received original digital signal to obtain a first digital signal; the first digital signal isolation module is configured to perform optical isolation and level conversion on the received first digital signal to obtain a target level digital signal; the filter level control module is configured to perform digital filtering processing on the received target level digital signal to obtain a target anti-interference digital signal; the filter level control module is further configured to correspondingly output a target control signal based on the level of the original input voltage, and then isolate and transmit the target control signal to the multilevel adaptation module through the second digital isolation module to perform the on-off operation of each switching device, thereby realizing the adaptive control of multiple levels of the original digital signal. Wherein, the multilevel adaptation module includes three series-connected switching devices, and each switching device is respectively connected in parallel with a resistor.

2. The multi-level adaptive anti-interference digital signal input device according to claim 1, wherein The electromagnetic compatibility module includes a first resistor, a capacitor, and a transient voltage suppression diode; wherein, a node formed by connecting one end of the transient voltage suppression diode and one end of the first resistor serves as an input end of the original digital signal and the original input voltage; a node formed by connecting the other end of the first resistor and one end of the capacitor is connected to a positive input end of the first digital signal isolation module; the other end of the transient voltage suppression diode and the other end of the capacitor are both grounded.

3. The multi-level adaptive anti-interference digital signal input device according to claim 2, characterized in that, The electromagnetic compatibility module further includes a diode; wherein, a node formed by connecting the other end of the first resistor and one end of the capacitor is connected to the positive electrode of the diode; the negative electrode of the diode is connected to the positive input end of the first digital signal isolation module.

4. The multi-level adaptive anti-interference digital signal input device according to claim 1, wherein When the three series-connected switching devices are all triodes, the multi-level adaptation module includes a first triode, a second triode, a third triode, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor; wherein, the collector and emitter of the first triode are respectively connected to both ends of the third resistor, the collector and emitter of the second triode are respectively connected to both ends of the fifth resistor, and the collector and emitter of the third triode are respectively connected to both ends of the seventh resistor; the node where the fourth resistor and the sixth resistor are connected is respectively connected to the gates of the first triode, the second triode, and the third triode; the emitter of the first triode is connected to the collector of the second triode, the emitter of the second triode is connected to the collector of the third triode, and the emitter of the third triode is grounded; when the first triode, the second triode, and the third triode are conducting, they respectively short-circuit the third resistor, the fifth resistor, and the seventh resistor; one end of the fourth resistor is connected to the output end of the second digital isolation module, and the other end is connected to the sixth resistor; the other end of the sixth resistor is grounded.

5. The multi-level adaptive anti-interference digital signal input device according to claim 4, wherein When the first digital signal isolation module is a first optocoupler, the negative input terminal of the first optocoupler is connected to the collector of the first triode, the emitter of the first optocoupler is connected to the digital signal input terminal of the filter level control module, the collector of the first optocoupler is connected to the first optocoupler power supply, and the emitter of the first optocoupler is grounded.

6. The multi-level adaptive anti-interference digital signal input device according to claim 1, characterized in that, When the second digital signal isolation module is a second optocoupler, the positive input terminal of the second optocoupler is connected to the digital signal output terminal of the filter level control module, the negative input terminal of the second optocoupler is grounded, and the collector of the second optocoupler is connected to the second optocoupler power supply.

7. The multi-level adaptive anti-interference digital signal input device according to claim 1, characterized in that, The filter level control module includes a digital filtering unit, and the algorithms in the digital filtering unit include one of a dead zone processing algorithm, a median filtering algorithm, a sliding filtering algorithm, and a low-pass filtering algorithm.

8. The multi-level adaptive anti-interference digital signal input device according to claim 1, characterized in that, The switching device is a triode, a MOSFET, a relay, an IGBT, or a contactor.

9. A rail transit vehicle control system, characterized in that, The rail transit vehicle control system has the multi-level adaptation anti-interference digital signal input device according to any one of claims 1 to 8.

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