Train control bus drive and protection circuits and electronic equipment

Abstract

This invention discloses a train control bus drive and protection circuit and electronic device, relating to the field of rail transit control technology. The train control bus drive and protection circuit includes: a first drive module; a second drive module, the input of which is electrically connected to the output of the first drive module; a line compensation module, the input of which is electrically connected to the output of the second drive module, the line compensation module being used to improve the response conduction rate of the first drive module; and a bus voltage drop acceleration module, the input of which is electrically connected to the output of the line compensation module, and the output of which is grounded. This invention solves the problems of existing bus steady-state current being only a few milliamps, cable distributed capacitance being greatly affected by factors such as temperature, humidity, and wiring differences, exhibiting capacitive characteristics; and the slow response, lack of protection function, and poor reliability when using current control devices for drive.

Description

Technical Field

[0001] This invention relates to the field of rail transit control technology, and more specifically, to a train control bus drive and protection circuit and electronic equipment. Background Technology

[0002] With the development of electronic technology, MOSFETs have been widely used as switching devices to replace electromagnetic relays in rail transit vehicle control systems. The design of their drive circuits is extremely important for the safety and reliability of vehicle operation. The control cable for a single vehicle is approximately 40m long, and together with vehicle jumpers (connectors), they form the train control bus. The total length of the control bus for a 6-car train is approximately 280m, and for an 8-car train, it is approximately 380m. In vibration environments, connectors may loosen, water may enter, and the cable insulation may wear down.

[0003] The existing bus steady-state current is only a few milliamperes, and the cable distributed capacitance is greatly affected by factors such as temperature, humidity, and wiring differences, exhibiting capacitive characteristics. When using the current control device for driving, there are problems such as slow response when the bus level rises and falls, lack of protection function, and poor reliability. Summary of the Invention

[0004] Objective of the invention: To provide a train control bus drive and protection circuit, device, equipment and storage medium to at least solve one of the problems existing in the prior art.

[0005] Technical solution: A train control bus drive and protection circuit, comprising: First drive module; The second driving module has its input terminal electrically connected to the output terminal of the first driving module. A line compensation module, the input of which is electrically connected to the output of the second drive module, is used to improve the response conduction rate of the first drive module; and The bus voltage sag acceleration module has its input terminal electrically connected to the output terminal of the line compensation module, and its output terminal grounded. The bus voltage sag acceleration module is used to turn on when the first drive module or the second drive module is off, and quickly release the residual charge of the control bus to accelerate the voltage sag.

[0006] Preferably, the first driving module includes: a first main controller that receives a first network control signal, the output terminal of the first main controller being connected to the input terminal of a first signal isolation unit, the output terminal of the first signal isolation unit being connected to the input terminal of a first driving unit, and the output terminal of the first driving unit being connected to the gate of a first switching device.

[0007] Preferably, the drain of the first switching device is connected to the power input terminal, and the source of the first switching device is connected to the input terminal of the first current acquisition unit.

[0008] Preferably, the first output terminal of the first current acquisition unit is connected to the input terminal of the first analog-to-digital converter, and the output terminal of the first analog-to-digital converter is connected to the input terminal of the first main controller. Specifically, the first main controller sends the received first network control signal to the first signal isolation unit for signal isolation and transformation, and the first drive unit controls the first drive module to be turned on or off according to the processed first network control signal; and, The first current acquisition unit sends the acquired current to the first main controller. The first main controller verifies the consistency between the driving result of the first switching device and the first network control signal based on the current value, so as to realize the self-diagnostic function.

[0009] Preferably, the second driving module includes: a second main controller that receives a second network control signal, the output terminal of the second main controller being connected to the input terminal of a second signal isolation unit, the output terminal of the second signal isolation unit being connected to the input terminal of a second driving unit, and the output terminal of the second driving unit being connected to the gate of a second switching device.

[0010] Preferably, the drain of the second switching device is connected to the second output terminal of the first current acquisition unit, and the source of the second switching device is connected to the input terminal of the second current acquisition unit.

[0011] Preferably, the first output terminal of the second current acquisition unit is connected to the input terminal of the second analog-to-digital converter, and the output terminal of the second analog-to-digital converter is connected to the input terminal of the second main controller. Specifically, the second main controller sends the received second network control signal to the second signal isolation unit for signal isolation and transformation, and the second drive unit controls the second drive module to be turned on or off according to the processed second network control signal; and, The second current acquisition unit sends the acquired current to the second main controller. The second main controller verifies the consistency between the driving result of the second switching device and the second network control signal based on the current value, so as to realize the self-diagnostic function.

[0012] Preferably, the line compensation module is composed of RL passive components; the line compensation module is connected to the second output terminal of the second current acquisition unit.

[0013] Preferably, the bus voltage drop acceleration module includes: a logic circuit that receives output signals from the first master controller and the second master controller, wherein the output terminal of the logic circuit is connected to the input terminal of the third signal isolation unit, the output terminal of the third signal isolation unit is connected to the input terminal of the third driving unit, and the output terminal of the third driving unit is connected to the gate of the third switching device. The drain of the third switching device is connected to the output terminal of the line compensation module, and the source of the third switching device is connected to the bleeder resistor and the diode in sequence.

[0014] Preferably, the first switching device is an enhancement-mode N-MOSFET device, and the second switching device is a depletion-mode N-MOSFET device.

[0015] To achieve the above objectives, according to another aspect of this application, an electronic device is provided.

[0016] The electronic device according to this application includes the aforementioned train control bus drive and protection circuit and a load; the train control bus drive and protection circuit is connected to the load, and the train control bus drive and protection circuit is used to drive the load.

[0017] Beneficial Effects: In this embodiment, a line compensation module and a bus voltage sag acceleration module are added. A first driving module and a second driving module have their input terminals electrically connected to the output terminal of the first driving module. A line compensation module has its input terminal electrically connected to the output terminal of the second driving module, and the line compensation module is used to improve the response turn-on rate of the first driving module. A bus voltage sag acceleration module has its input terminal electrically connected to the output terminal of the line compensation module, and its output terminal is grounded. The bus voltage sag acceleration module is used to turn on when either the first or second driving module is off, rapidly... By rapidly releasing residual charge on the control bus to accelerate voltage drop, the device's turn-on rate and turn-off speed are accelerated. This improves the control bus voltage rise rate, reduces turn-on delay, suppresses voltage oscillations caused by rapid bus voltage rise, reduces the delay effect of control cable distributed capacitance on the controlled object, and reduces turn-off delay. This solves the existing problems of slow response, lack of protection function, and poor reliability when using current control devices, where the bus steady-state current is only a few milliamps, cable distributed capacitance is greatly affected by factors such as temperature, humidity, and wiring differences, and exhibits capacitive characteristics. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the train control bus drive and protection circuit according to an embodiment of this application.

[0019] The attached figures are labeled as follows: 10. First drive module; 20. Second drive module; 30. Line compensation module; 40. Bus voltage drop acceleration module. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0021] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0022] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] like Figure 1 As shown, this application relates to a train control bus drive and protection circuit and electronic equipment. The train control bus drive and protection circuit includes: a first drive module 10; which is used to independently control the on / off state of an enhanced switching device Q1.

[0025] The second drive module 20 has its input terminal electrically connected to the output terminal of the first drive module 10; it can achieve a good electrical connection effect, thereby ensuring a good electrical signal transmission effect; at the same time, the second drive module 20 is used to independently control the on / off state of the depletion-type switch Q2, and the enhancement-type switch Q1 and the depletion-type switch Q2 are connected in series at the bus output terminal.

[0026] The line compensation module 30 has its input terminal electrically connected to the output terminal of the second drive module 20. The line compensation module 30 is used to improve the response turn-on rate of the first drive module 10 and to accelerate the drive voltage rise when the enhanced switching device Q1 is turned on.

[0027] The bus voltage sag acceleration module 40 has its input terminal electrically connected to the output terminal of the line compensation module 30, and its output terminal grounded. The bus voltage sag acceleration module 40 is used to turn on when the first drive module 10 or the second drive module 20 is off, rapidly releasing residual charge on the control bus to accelerate voltage sag. The drain of the enhancement-type N-MOSFET is connected to the bus output node, and its source is grounded through a bleed resistor R1 and a diode D1. It is used to turn on when the enhancement-type switching device Q1 or the depletion-type switching device Q2 is off, rapidly releasing residual charge on the cable to accelerate voltage sag.

[0028] As can be seen from the above description, this application achieves the following technical effects: In this embodiment, a line compensation module 30 and a bus voltage sag acceleration module 40 are added. These are implemented via a first driving module 10; a second driving module 20, whose input terminal is electrically connected to the output terminal of the first driving module 10; a line compensation module 30, whose input terminal is electrically connected to the output terminal of the second driving module 20, and the line compensation module 30 is used to improve the response turn-on rate of the first driving module 10; and a bus voltage sag acceleration module 40, whose input terminal is electrically connected to the output terminal of the line compensation module 30 and whose output terminal is grounded, is used to accelerate the response of the first driving module 10 or the second driving module 20. When the active module 20 is turned off, it is turned on, rapidly releasing the residual charge on the control bus to accelerate the voltage drop. This achieves the purpose of accelerating the device's turn-on rate and rapid turn-off, thereby increasing the control bus voltage rise rate, reducing turn-on delay, suppressing voltage oscillations caused by rapid bus voltage rise, reducing the delay effect of the control cable's distributed capacitance on the controlled object, and reducing the turn-off delay. This solves the technical problems of the existing bus steady-state current being only a few milliamperes, the cable distributed capacitance being greatly affected by factors such as temperature, humidity, and wiring differences, exhibiting capacitive characteristics, and the slow response, lack of protection function, and poor reliability when using the current control device for driving.

[0029] Furthermore, the first driving module 10 includes: a first main controller that receives a first network control signal; the output terminal of the first main controller is connected to the input terminal of a first signal isolation unit; the output terminal of the first signal isolation unit is connected to the input terminal of a first driving unit; and the output terminal of the first driving unit is connected to the gate of a first switching device. It is understood that this enables good electrical signal transmission, thereby achieving good control of the first switching device.

[0030] Furthermore, the drain of the first switching device is connected to the power input terminal, and the source of the first switching device is connected to the input terminal of the first current acquisition unit. This allows for effective power supply and current acquisition.

[0031] Furthermore, the first output terminal of the first current acquisition unit is connected to the input terminal of the first analog-to-digital converter, and the output terminal of the first analog-to-digital converter is connected to the input terminal of the first main controller. Specifically, the first main controller sends the received first network control signal to the first signal isolation unit for signal isolation and transformation, and the first drive unit controls the first drive module 10 to be turned on or off according to the processed first network control signal; and, The first current acquisition unit sends the acquired current to the first main controller. The first main controller verifies the consistency between the driving result of the first switching device and the first network control signal based on the current value, thereby achieving a self-diagnostic function. This enables good control and detection, ensuring optimal operational performance.

[0032] It should be noted that the methods for receiving the first network control signal include, but are not limited to: the first communication port; the first main controller is CPU1; the first signal isolation unit is op1, which is also an optocoupler; the first switching device is an enhancement-mode N-MOSFET device Q1; and the first current acquisition unit is IC1.

[0033] Specifically, the first drive module 10 consists of a communication port 1, a CPU 1, an optocoupler 1, a drive circuit 1, an enhanced N-MOSFET device Q1, a first analog-to-digital converter A / D 1, and a current acquisition IC 1.

[0034] Furthermore, the second driving module 20 includes: a second main controller that receives a second network control signal; the output terminal of the second main controller is connected to the input terminal of a second signal isolation unit; the output terminal of the second signal isolation unit is connected to the input terminal of a second driving unit; and the output terminal of the second driving unit is connected to the gate of a second switching device. It is understood that this enables good electrical signal transmission, thereby achieving good control of the second switching device.

[0035] Furthermore, the drain of the second switching device is connected to the second output terminal of the first current acquisition unit, and the source of the second switching device is connected to the input terminal of the second current acquisition unit. This allows for effective current acquisition.

[0036] Furthermore, the first output terminal of the second current acquisition unit is connected to the input terminal of the second analog-to-digital converter, and the output terminal of the second analog-to-digital converter is connected to the input terminal of the second main controller. Specifically, the second main controller sends the received second network control signal to the second signal isolation unit for signal isolation and transformation, and the second drive unit controls the second drive module 20 to be turned on or off according to the processed second network control signal; and, The second current acquisition unit sends the acquired current to the second main controller. The second main controller verifies the consistency between the driving result of the second switching device and the second network control signal based on the current value, thereby achieving a self-diagnostic function. This allows for effective control and detection, ensuring optimal operational performance.

[0037] It should be noted that the methods for receiving the second network control signal include, but are not limited to: a second communication port; a second main controller, CPU2; a second signal isolation unit, op2, which is also an optocoupler; a second switching device, a depletion-type N-MOSFET device Q2; and a second current acquisition unit, IC2.

[0038] Specifically, the second drive module 20 consists of a communication port 2, a CPU 2, an optocoupler 2, a drive circuit 2, a depletion-type N-MOSFET device Q2, a second analog-to-digital converter A / D 2, and a current acquisition IC 2.

[0039] Furthermore, when the steady-state bus current exceeds a set threshold, the enhancement-mode N-MOSFET device Q1 and the depletion-mode N-MOSFET device Q2 are turned off, and a short-circuit message is sent. When both the bus inrush current and steady-state current exceed the set threshold, an insulation fault message is sent. When the current is less than the normal value, a connector loosening information is sent.

[0040] When the enhancement-mode N-MOSFET device Q1 or the depletion-mode N-MOSFET device Q2 is turned off, the enhancement-mode N-MOSFET device Q3 is turned on, and the charge in the control cable is released through the bleed resistor R1, accelerating the voltage drop in the control cable; conversely, the enhancement-mode N-MOSFET device Q3 is turned off.

[0041] Furthermore, the line compensation module 30 is composed of RL passive devices; the line compensation module 30 is connected to the second output terminal of the second current acquisition unit. It can be understood that by adding the line compensation module 30 to the driving device, the VGS rise rate of the enhancement-mode N-MOSFET device is increased, the device turn-on rate is accelerated, thereby increasing the control bus voltage rise rate, reducing turn-on delay, and suppressing voltage oscillations caused by rapid bus voltage rise.

[0042] Specifically, the line compensation module 30 is composed of RL passive components, which does not affect the steady-state current of the bus output.

[0043] Furthermore, the bus voltage drop acceleration module 40 includes: a logic circuit that receives output signals from the first master controller and the second master controller, the output terminal of the logic circuit being connected to the input terminal of the third signal isolation unit, the output terminal of the third signal isolation unit being connected to the input terminal of the third driving unit, and the output terminal of the third driving unit being connected to the gate of the third switching device. The drain of the third switching device is connected to the output terminal of the line compensation module 30, and the source of the third switching device is connected to the bleeder resistor R1 and the diode D1 in sequence. It is understood that when the enhancement-type switching device Q1 or the depletion-type switching device Q2 is turned off, the control bus voltage drops rapidly, the optocoupler current flowing through the controlled component decreases rapidly, the optocoupler is quickly cut off, the delay effect of the distributed capacitance of the control cable on the controlled object is reduced, and the shutdown delay is reduced.

[0044] Specifically, the bus voltage drop acceleration module consists of a NAND gate logic circuit, an optocoupler 3, a driver circuit 3, an enhancement-type N-MOSFET device Q3, a bleeder resistor R1, and a diode D1.

[0045] Furthermore, the first switching device is an enhancement-mode N-MOSFET, and the second switching device is a depletion-mode N-MOSFET. It is understood that the use of enhancement-mode switching device Q1 and depletion-mode switching device Q2 in the drive module provides good safety guidance and improved anti-interference performance; the series output of the drive module avoids the problem of a single device failing to turn off the output via the gate signal after its drain-source breakdown, ensuring reliable bus shutdown.

[0046] The working principle of this invention is as follows: When the first drive module 10, the second drive module 20, the line compensation module 30 and the bus voltage drop acceleration module 40 are connected, the communication port of the drive device receives the network control signal, the CPU sends the control signal to the optocoupler for signal isolation and conversion, and the drive device receives the optocoupler signal to control the turn-on or turn-off of the enhancement-type N-MOSFET device Q1 and the depletion-type switching device Q2.

[0047] If the depletion-mode switch Q2 receives V before the enhancement-mode N-MOSFET device Q1 GS（ON） The signal shows that the depletion-mode switching device Q2 has a turn-on speed in the nanosecond range. Due to the line compensation module, the drive voltage VGS of the enhancement-mode N-MOSFET device Q1 quickly rises to the rated voltage, and the turn-on time of the enhancement-mode N-MOSFET device Q1 is shortened from several seconds before compensation to several microseconds after compensation. The bus voltage quickly rises to the rated voltage, and the total bus voltage rise time is approximately in the microsecond range.

[0048] If the enhancement-mode N-MOSFET device Q1 receives V before the depletion-mode switch Q2 GS（ON） Since the depletion-mode switch Q2 is not turned on, the turn-on time of the enhancement-mode N-MOSFET device Q1 is not affected by the bus capacitance and is approximately several microseconds; the turn-on speed of the depletion-mode switch Q2 is in the nanosecond range, and the total rise time of the bus voltage is approximately in the microsecond range.

[0049] The enhancement-mode N-MOSFET device Q1 and the depletion-mode switch Q2 have no strict turn-on timing, and the control logic is simple. CPU1 and CPU2 receive the same control signal, but there is no need for signal synchronization between them.

[0050] The line compensation module 30 is composed of RL passive components and does not affect the steady-state current of the bus.

[0051] The gate signals for turning on and off of the enhancement-mode N-MOSFET device Q1 and the depletion-mode switching device Q2 are different: for the enhancement-mode N-MOSFET device Q1, the gate signal for full conduction is V. GS（on） 15V, V off GS <V GS（th） The depletion-type switching device Q2 is fully turned on, V. GS（on） 10V, turn off V GS（off） -3V. The enhancement-mode N-MOSFET device Q1 and the depletion-mode switch Q2 are connected in series, providing good fail-safe guidance and reliable bus shutdown.

[0052] The vehicle cables use a π-type equivalent circuit, and the connectors use an RC-type equivalent circuit. The bus and load equivalent circuits are established according to the vehicle grouping.

[0053] When the enhancement-mode N-MOSFET device Q1 is turned on and the depletion-mode switch Q2 is turned on, the CPU outputs the current value through the current acquisition unit. When the monitored current value is consistent with the equivalent circuit fault characteristic value, the CPU reports to the vehicle TCMS a bus short circuit (steady-state current is greater than the set threshold), turns off the enhancement-mode N-MOSFET device Q1 and the depletion-mode switch Q2; bus insulation fault (both inrush current and steady-state current are greater than the set threshold); and connector loose (steady-state current is less than the normal value).

[0054] When the enhancement-mode N-MOSFET device Q1 or the depletion-mode switch Q2 is turned off, the enhancement-mode N-MOSFET device Q3 is turned on, and the charge of the control cable is released to the vehicle body through the discharge resistor R1 and the diode D1, accelerating the voltage drop of the control cable and reducing the optocoupler cutoff time inside the control device from the second level to the microsecond level; conversely, the enhancement-mode N-MOSFET device Q3 is turned off.

[0055] This application also relates to an electronic device, including the aforementioned train control bus drive and protection circuit and a load; the train control bus drive and protection circuit is connected to the load, and the train control bus drive and protection circuit is used to drive the load.

[0056] The present invention also has the following beneficial effects: 1. The control module monitors the load current in real time to achieve overcurrent protection, insulation monitoring, and early warning of connector loosening faults; 2. The control module collects and monitors the load current, completes signal retrieval, verifies the consistency between the drive command and the MOSFET gate signal, prevents false triggering caused by vehicle electromagnetic interference, and improves reliability.

[0057] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A train control bus drive and protection circuit, characterized in that, include: First drive module (10); The second drive module (20) has its input terminal electrically connected to the output terminal of the first drive module (10); A line compensation module (30) is provided, the input of which is electrically connected to the output of the second drive module (20). The line compensation module (30) is used to improve the response conduction rate of the first drive module (10). The bus voltage drop acceleration module (40) has its input terminal electrically connected to the output terminal of the line compensation module (30) and its output terminal grounded. The bus voltage drop acceleration module (40) is used to turn on when the first drive module (10) or the second drive module (20) is turned off, and quickly release the residual charge of the control bus to accelerate the voltage drop. The first driving module (10) includes: a first main controller that receives a first network control signal, the output terminal of the first main controller being connected to the input terminal of a first signal isolation unit, the output terminal of the first signal isolation unit being connected to the input terminal of a first driving unit, and the output terminal of the first driving unit being connected to the gate of a first switching device; The drain of the first switching device is connected to the power input terminal, and the source of the first switching device is connected to the input terminal of the first current acquisition unit. The first output terminal of the first current acquisition unit is connected to the input terminal of the first analog-to-digital converter, and the output terminal of the first analog-to-digital converter is connected to the input terminal of the first main controller. The first main controller sends the received first network control signal to the first signal isolation unit for signal isolation and transformation; the first drive unit controls the first drive module (10) to be turned on or off according to the processed first network control signal; and, The first current acquisition unit sends the acquired current to the first main controller. The first main controller verifies the consistency between the driving result of the first switching device and the first network control signal based on the current value, so as to realize the self-diagnostic function. The second driving module (20) includes: a second main controller that receives a second network control signal, the output terminal of the second main controller being connected to the input terminal of the second signal isolation unit, the output terminal of the second signal isolation unit being connected to the input terminal of the second driving unit, and the output terminal of the second driving unit being connected to the gate of the second switching device; The bus voltage drop acceleration module (40) includes: a logic circuit that receives output signals from the first master controller and the second master controller, wherein the output terminal of the logic circuit is connected to the input terminal of the third signal isolation unit, the output terminal of the third signal isolation unit is connected to the input terminal of the third driving unit, and the output terminal of the third driving unit is connected to the gate of the third switching device. The drain of the third switching device is connected to the output terminal of the line compensation module (30), and the source of the third switching device is connected to the bleeder resistor and the diode in sequence.

2. The train control bus drive and protection circuit according to claim 1, characterized in that, The drain of the second switching device is connected to the second output terminal of the first current acquisition unit, and the source of the second switching device is connected to the input terminal of the second current acquisition unit.

3. The train control bus drive and protection circuit according to claim 2, characterized in that, The first output terminal of the second current acquisition unit is connected to the input terminal of the second analog-to-digital converter, and the output terminal of the second analog-to-digital converter is connected to the input terminal of the second main controller. The second main controller sends the received second network control signal to the second signal isolation unit for signal isolation and transformation. The second drive unit controls the second drive module (20) to turn on or off according to the processed second network control signal. The second current acquisition unit sends the acquired current to the second main controller. The second main controller verifies the consistency between the driving result of the second switching device and the second network control signal based on the current value, so as to realize the self-diagnostic function.

4. The train control bus drive and protection circuit according to claim 3, characterized in that, The line compensation module (30) is composed of RL passive devices; the line compensation module (30) is connected to the second output terminal of the second current acquisition unit.

5. The train control bus drive and protection circuit according to claim 1, characterized in that, The first switching device is an enhancement-mode N-MOSFET device, and the second switching device is a depletion-mode N-MOSFET device.

6. An electronic device, characterized in that, It includes the train control bus drive and protection circuit and load as described in any one of claims 1-5; the train control bus drive and protection circuit is connected to the load, and the train control bus drive and protection circuit is used to drive the load.

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