Dynamic connection circuit and control method for platform screen door and running rail of urban rail transit

Abstract

A dynamic connection circuit and control method for platform screen doors and running rails in urban rail transit. The first end of resistor R1 is connected to the running rail, and its second end is connected to the second end of resistor R2 and the platform screen door through a current measurement module. The first end of resistor R2 is grounded. The branches connected by transistor V1 and diode D1, and the branches connected by transistor V2 and diode D2 are all in parallel with R1. The branches connected by transistor V3 and diode D3, and the branches connected by transistor V4 and diode D4 are all in parallel with R2. When the train enters the station and the platform screen door opens, first control V3 and V4 to be both turned on, and then detect the potential difference between the running rail and the platform screen door. If the negative potential difference is small, control V1 not to conduct. If the negative potential difference is large, control V1 to conduct. If the positive potential difference is small, control V2 not to conduct. If the positive potential difference is large, control V2 to conduct. When the train does not enter the station and passengers do not get on or off, control V1 and V2 not to conduct, and control V3 and V4 to be both turned on. The present invention can ensure the safe operation of rail transit.

Description

Technical Field

[0001] The invention belongs to the technical field of rail transit, and in particular is a circuit and a control method for dynamically connecting a platform screen door and a running track of an urban rail transit. Background Art

[0002] Urban rail transit generally uses a DC traction power supply system to provide power for trains. The running rails serve as the return channel for the train's traction current. During the traction current return process, there will be a potential difference between the running rails and the ground, which is called the rail potential. At the same time, part of the return current will leak from the running rails into the surrounding medium, forming stray current. At present, the rail potential and stray current have caused serious damage to the safe operation of urban rail transit.

[0003] As a trackside device, the shield door is installed at the edge of the platform and is very close to the train body. When passengers get on and off the train, they are very likely to touch the train body shell and the shield door body at the same time. Since the train body and the running track are at the same potential, its shell may have a higher potential, which may cause a potential difference between the body and the shield door, posing a serious safety hazard to the personal safety of passengers. For this reason, most subway operating lines in the country currently use shield door insulation design and installation to insulate the shield door structure from the platform structure, and use cables to connect the shield door and the running track to the same potential to ensure that passengers are not affected by the rail potential when getting on and off the train. Figure 1 As shown, the running rail is set on the ballast and insulated from the ballast by an insulating pad. This method of directly connecting the shield door and the running rail with an equipotential connection cable has the following problems: First, this connection method is fixed. Affected by factors such as construction reasons and humid environment, and with the increase of operating years, the shield door generally has weak insulation and is prone to insulation failure. Once the insulation of the shield door is weak or fails, the return current will leak through the shield door position, and then the shield door will become a concentrated area for the leakage of line stray current, which will increase the level of line stray current and have a certain corrosion effect on the surrounding buried metal facilities. Second, during the long-term connection process, when the shield door is closed and the passengers cannot contact the train potential and the running rail potential, the shield door is still connected to the running rail with the same potential, and there is a potential difference between it and the surrounding structure. At this time, when the shield door has local insulation weakness to the surrounding structure, it is easy to cause spark discharge to the adjacent metal parts, which will have an adverse impact on the safety of operation and passengers. At present, many rail transit lines in China have experienced spark discharge and leakage of surrounding stray current. 3. The connection status between the shield door and the ground grid is uncontrollable, and the personal safety of passengers waiting for the train cannot be fully guaranteed. 4. When the equipotential connection cable is disconnected, if there is a certain potential difference between the running track and the shield door, it will cause certain harm to passengers getting on and off the train.

[0004] The above-mentioned disadvantages of the prior art have led to the fact that the connection method between the platform screen door and the running rail can no longer effectively ensure the safe operation of the track system. At the same time, it has relatively large side effects. Therefore, how to design a reasonable connection control circuit for the platform screen door, running rail and ground has become the key to the personal safety of passengers and the protection against stray current in urban rail transit. Summary of the Invention

[0005] Aiming at the problems existing in the above-mentioned prior art, the present invention provides a dynamic connection circuit and control method for the platform screen door and running rail of urban rail transit. This circuit can facilitate the reasonable and dynamic control of the connection states of the running rail, platform screen door and ground grid, and can avoid the hazards brought by the direct equipotential connection or non-connection state between the platform screen door and the running rail to the personal safety of passengers and the protection of line stray current and rail potential; the control process of this method is simple and highly reliable, and can effectively ensure the safe operation of urban rail transit.

[0006] To achieve the above object, the present invention provides a dynamic connection circuit for the platform screen door and running rail of urban rail transit, including a power resistor R1, an insulated gate bipolar transistor V1, an insulated gate bipolar transistor V2, a reverse diode D1, a reverse diode D2, a power resistor R2, an insulated gate bipolar transistor V3, an insulated gate bipolar transistor V4, a reverse diode D3, a reverse diode D4, a current measurement module SI and a voltage measurement module SU;

[0007] The first end of the power resistor R1 serves as the first access end and is connected to the running rail through a first connection cable. The emitter of the insulated gate bipolar transistor V1 and the collector of the insulated gate bipolar transistor V2 are both connected to the first end of the power resistor R1. The negative electrode of the reverse diode D1 is connected to the collector of the insulated gate bipolar transistor V1, the positive electrode of the reverse diode D2 is connected to the second end of the power resistor R1, the positive electrode of the reverse diode D2 is connected to the emitter of the insulated gate bipolar transistor V2, and the negative electrode of the reverse diode D2 is connected to the second end of the power resistor R1;

[0008] The first end of the power resistor R2 is connected to the ground grid. The second end of the power resistor R2 serves as the second access end and is connected to the platform screen door through a second connection cable. The emitter of the insulated gate bipolar transistor V3 and the collector of the insulated gate bipolar transistor V4 are both connected to the first end of the power resistor R2. The negative electrode of the reverse diode D3 is connected to the collector of the insulated gate bipolar transistor V3, the positive electrode of the reverse diode D3 is connected to the second end of the power resistor R2, the positive electrode of the reverse diode D4 is connected to the emitter of the insulated gate bipolar transistor V4, and the negative electrode of the reverse diode D4 is connected to the second end of the power resistor R2;

[0009] One end of the current measurement module SI is connected to the second end of the power resistor R1, and the other end of the current measurement module SI is connected to the second end of the power resistor R2;

[0010] One end of the voltage measurement module SU is connected to the first end of the power resistor R1, and the other end of the voltage measurement module SU is connected to the second end of the power resistor R1.

[0011] Furthermore, in order to facilitate the implementation of the automatic control process, a controller is further included. The first output end of the controller is connected to the gate of the insulated gate bipolar transistor V1, the second output end of the controller is connected to the gate of the insulated gate bipolar transistor V2, the third output end of the controller is connected to the gate of the insulated gate bipolar transistor V3, and the fourth output end of the controller is connected to the gate of the insulated gate bipolar transistor V4.

[0012] Furthermore, in order to effectively protect the insulated gate bipolar transistors, freewheeling diodes are respectively connected between the collector and the emitter of the insulated gate bipolar transistor V1, between the collector and the emitter of the insulated gate bipolar transistor V2, between the collector and the emitter of the insulated gate bipolar transistor V3, and between the collector and the emitter of the insulated gate bipolar transistor V4.

[0013] As a preference, an insulating housing is further included. The power resistor R1, the insulated gate bipolar transistors V1 and V2, the reverse diodes D1 and D2, the power resistor R2, the insulated gate bipolar transistors V3 and V4, the reverse diodes D3 and D4, the current measurement module SI, the voltage measurement module SU and the controller are all assembled in the insulating housing, and the first connection cable passes through the first wire outlet hole on the insulating housing, and the second connection cable passes through the second wire outlet hole on the insulating housing.

[0014] As a preference, the controller is a PLC controller.

[0015] In the present invention, an insulated gate bipolar transistor V1, an insulated gate bipolar transistor V2, a power resistor R1, a reverse diode D1, a reverse diode D2, a voltage measurement module SU, and a current measurement module SI are connected between the running rail and the platform screen door. In this way, it is convenient to realize the bidirectional dynamic control of the connection state by using the insulated gate bipolar transistors V1 and V2 according to the potential difference state between the running rail and the platform screen door. An insulated gate bipolar transistor V3, an insulated gate bipolar transistor V4, a power resistor R2, a reverse diode D3, and a reverse diode D4 are connected between the platform screen door and the ground grid. In this way, it is convenient to realize the dynamic control of the connection state with the ground grid by using the insulated gate bipolar transistors V3 and V4 according to the state of the platform screen door. This circuit can conveniently realize the dynamic connection control between the platform screen door and the running rail, and between the platform screen door and the ground grid, avoiding the generation of stray current and rail potential problems caused by the long-term connection between the platform screen door and the running rail, and avoiding the personal safety problems caused by the disconnection between the platform screen door and the running rail. At the same time, this circuit can conveniently detect the insulation state of the platform screen door.

[0016] The present invention also provides a dynamic control method for the platform screen door and the running rail of urban rail transit, including a dynamic connection circuit for the platform screen door and the running rail of urban rail transit, and further includes the following steps:

[0017] When the train enters the station and the platform screen door is opened, first control the insulated gate bipolar transistors V3 and V4 to remain in the non-conducting state, and then detect the potential difference state between the current running rail and the platform screen door through the voltage measurement module SU;

[0018] If the negative potential difference of the running rail with respect to the platform screen door is small and less than the first set threshold, control the insulated gate bipolar transistor V1 not to conduct; if the negative potential difference of the running rail with respect to the platform screen door is large and greater than the second set threshold, control the insulated gate bipolar transistor V1 to conduct, so that the running rail is negatively connected to the platform screen door; if the positive potential difference of the running rail with respect to the platform screen door is small and less than the third set threshold, control the insulated gate bipolar transistor V2 not to conduct, and if the positive potential difference of the running rail with respect to the platform screen door is large and greater than the fourth set threshold, control the insulated gate bipolar transistor V2 to conduct, so that the running rail is positively connected to the platform screen door;

[0019] When the train does not enter the station and passengers do not get on or off, control the insulated gate bipolar transistors V1 and V2 to remain in the non-conducting state, and control the insulated gate bipolar transistors V3 and V4 to remain in the conducting state.

[0020] Furthermore, in order to be able to give an alarm in a timely and effective manner when the insulation value is low, when the insulated gate bipolar transistor V1 or V2 conducts, calculate the self-insulation value of the platform screen door based on the detection results of the voltage measurement module SU and the current measurement module SI, and control the alarm device to send out a warning signal when the insulation value is low.

[0021] In this method, when the train enters the station and the platform screen door opens, first control the insulated gate bipolar transistors V3 and V4 to remain non-conductive, which can disconnect the platform screen door from the ground, facilitating subsequent equipotential control between the running rail and the platform screen door. When the train is not entering the station and passengers are not getting on or off, control the insulated gate bipolar transistors V1 and V2 to remain non-conductive, making the running rail and the platform screen door independent of each other, ensuring that the platform screen door itself is not energized, and thus effectively preventing the running rail current from leaking through the platform screen door. At the same time, control the insulated gate bipolar transistors V3 and V4 to remain conductive, connecting the platform screen door to the ground, effectively ensuring the grounding and safety of the platform screen door system itself. This method can not only dynamically control the connection state according to the potential difference between the running rail and the platform screen door, but also ensure that the running rail current does not leak through the platform screen door. Its control process is simple and highly reliable, effectively ensuring the safe operation of urban rail transit. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the connection state between the platform screen door and the running rail in the prior art;

[0023] Figure 2 is the circuit diagram of the dynamic connection circuit proposed by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] As Figure 1 and Figure 2 shown, the present invention provides a dynamic connection circuit between the platform screen door and the running rail of urban rail transit, including a power resistor R1, insulated gate bipolar transistors V1, V2, reverse diodes D1, D2, a power resistor R2, insulated gate bipolar transistors V3, V4, reverse diodes D3, D4, a current measurement module SI, and a voltage measurement module SU;

[0026] The first end of the power resistor R1 serves as the first access end and is connected to the running rail through a first connection cable. The emitter of the insulated gate bipolar transistor V1 and the collector of the insulated gate bipolar transistor V2 are both connected to the first end of the power resistor R1. The negative electrode of the reverse diode D1 is connected to the collector of the insulated gate bipolar transistor V1, the positive electrode of the reverse diode D2 is connected to the second end of the power resistor R1, the positive electrode of the reverse diode D2 is connected to the emitter of the insulated gate bipolar transistor V2, and the negative electrode of the reverse diode D2 is connected to the second end of the power resistor R1;

[0027] The first end of the power resistor R2 is connected to the ground grid. The second end of the power resistor R2 serves as the second access end and is connected to the shielding door through a second connection cable. The emitter of the insulated gate bipolar transistor V3 and the collector of the insulated gate bipolar transistor V4 are both connected to the first end of the power resistor R2. The negative pole of the reverse diode D3 is connected to the collector of the insulated gate bipolar transistor V3, and the positive pole of the reverse diode D3 is connected to the second end of the power resistor R2. The positive pole of the reverse diode D4 is connected to the emitter of the insulated gate bipolar transistor V4, and the negative pole of the reverse diode D4 is connected to the second end of the power resistor R2;

[0028] One end of the current measurement module SI is connected to the second end of the power resistor R1, and the other end of the current measurement module SI is connected to the second end of the power resistor R2;

[0029] One end of the voltage measurement module SU is connected to the first end of the power resistor R1, and the other end of the voltage measurement module SU is connected to the second end of the power resistor R1.

[0030] To facilitate the implementation of the automatic control process, a controller is further included. The first output end of the controller is connected to the gate of the insulated gate bipolar transistor V1, the second output end of the controller is connected to the gate of the insulated gate bipolar transistor V2, the third output end of the controller is connected to the gate of the insulated gate bipolar transistor V3, and the fourth output end of the controller is connected to the gate of the insulated gate bipolar transistor V4.

[0031] To effectively protect the insulated gate bipolar transistors, freewheeling diodes are respectively connected between the collector and the emitter of the insulated gate bipolar transistor V1, between the collector and the emitter of the insulated gate bipolar transistor V2, between the collector and the emitter of the insulated gate bipolar transistor V3, and between the collector and the emitter of the insulated gate bipolar transistor V4.

[0032] As a preference, an insulating housing is further included. The power resistor R1, the insulated gate bipolar transistor V1, the insulated gate bipolar transistor V2, the reverse diode D1, the reverse diode D2, the power resistor R2, the insulated gate bipolar transistor V3, the insulated gate bipolar transistor V4, the reverse diode D3, the reverse diode D4, the current measurement module SI, the voltage measurement module SU, and the controller are all assembled in the insulating housing, and the first connection cable passes through the first wire outlet hole on the insulating housing, and the second connection cable passes through the second wire outlet hole on the insulating housing.

[0033] As a preference, the controller is a PLC controller.

[0034] In the present invention, an insulated gate bipolar transistor V1, an insulated gate bipolar transistor V2, a power resistor R1, a reverse diode D1, a reverse diode D2, a voltage measurement module SU, and a current measurement module SI are connected between the running rail and the platform screen door. In this way, it is convenient to realize the bidirectional dynamic control of the connection state by using the insulated gate bipolar transistors V1 and V2 according to the potential difference state between the running rail and the platform screen door. An insulated gate bipolar transistor V3, an insulated gate bipolar transistor V4, a power resistor R2, a reverse diode D3, and a reverse diode D4 are connected between the platform screen door and the ground grid. In this way, it is convenient to realize the dynamic control of the connection state with the ground grid by using the insulated gate bipolar transistors V3 and V4 according to the state of the platform screen door. This circuit can conveniently realize the dynamic connection control between the platform screen door and the running rail, and between the platform screen door and the ground grid, avoiding the generation of stray current and rail potential problems caused by the long-term connection between the platform screen door and the running rail, and avoiding the personal safety problems caused by the disconnection between the platform screen door and the running rail. At the same time, this circuit can conveniently detect the insulation state of the platform screen door.

[0035] The present invention also provides a dynamic control method for the platform screen door and the running rail of urban rail transit, including a dynamic connection circuit for the platform screen door and the running rail of urban rail transit, and further includes the following steps:

[0036] When the train enters the station and the platform screen door is opened, first control the insulated gate bipolar transistors V3 and V4 to remain in a non-conducting state, so that the platform screen door is disconnected from the ground, in order to perform the equipotential control between the running rail and the platform screen door; then detect the potential difference state between the current running rail and the platform screen door through the voltage measurement module SU;

[0037] If the negative potential difference of the running rail with respect to the platform screen door is small and less than a set threshold one (this threshold can be set), then control the insulated gate bipolar transistor V1 not to conduct; if the negative potential difference of the running rail with respect to the platform screen door is large and greater than a set threshold two (this threshold can be set), then control the insulated gate bipolar transistor V1 to conduct, so that the running rail is negatively connected to the platform screen door; if the positive potential difference of the running rail with respect to the platform screen door is small and less than a set threshold three (this threshold can be set), then control the insulated gate bipolar transistor V2 not to conduct, if the positive potential difference of the running rail with respect to the platform screen door is large and greater than a set threshold four (this threshold can be set), then control the insulated gate bipolar transistor V2 to conduct, so that the running rail is positively connected to the platform screen door;

[0038] When the train does not enter the station and passengers do not get on or off, control the insulated gate bipolar transistors V1 and V2 to remain in a non-conducting state, so that the running rail and the platform screen door are independent of each other, the platform screen door is not charged itself, ensuring that the running rail current will not leak through the platform screen door, and control the insulated gate bipolar transistors V3 and V4 to remain in a conducting state, so that the platform screen door is connected to the ground, in order to ensure the grounding and safety of the platform screen door system itself.

[0039] As a preference, the resistance values of the power resistors R1 and R2 can be adjusted. Specifically, the equivalent resistance of the IGBT and the power resistors R1 and R2 can be changed by adjusting the pulse width of the IGBT.

[0040] In order to give an alarm in a timely and effective manner when the insulation value is low, when the insulated gate bipolar transistor V1 or V2 is turned on, the self-insulation value of the platform screen door is calculated based on the detection results of the voltage measurement module SU and the current measurement module SI, and the alarm device is controlled to emit a warning signal when the insulation value is low.

[0041] In this method, when the train enters the station and the platform screen door is opened, the insulated gate bipolar transistors V3 and V4 are first controlled to remain non-conductive, so that the platform screen door is disconnected from the ground, which facilitates the subsequent equipotential control between the running rail and the platform screen door; when the train does not enter the station and passengers do not get on or off, the insulated gate bipolar transistors V1 and V2 are controlled to remain non-conductive, so that the running rail and the platform screen door are independent of each other, ensuring that the platform screen door itself is not energized, and thus effectively preventing the running rail current from leaking through the platform screen door; at the same time, the insulated gate bipolar transistors V3 and V4 are controlled to remain conductive, so that the platform screen door is connected to the ground, effectively ensuring the grounding and safety of the platform screen door system itself; this method can not only achieve dynamic control of the connection state according to the potential difference state between the running rail and the platform screen door, but also ensure that the running rail current does not leak through the platform screen door. Its control process is simple and highly reliable, effectively ensuring the safe operation of urban rail transit.

Claims

1. A dynamic connection circuit between a platform screen door and a running rail of urban rail transit, characterized in that It includes a power resistor R1, an insulated gate bipolar transistor V1, an insulated gate bipolar transistor V2, a reverse diode D1, a reverse diode D2, a power resistor R2, an insulated gate bipolar transistor V3, an insulated gate bipolar transistor V4, a reverse diode D3, a reverse diode D4, a current measurement module SI, and a voltage measurement module SU; The first end of the power resistor R1 serves as the first access terminal and is connected to the running rail through a first connecting cable. The emitter of the insulated gate bipolar transistor V1 and the collector of the insulated gate bipolar transistor V2 are both connected to the first end of the power resistor R1. The negative electrode of the reverse diode D1 is connected to the collector of the insulated gate bipolar transistor V1, the positive electrode of the reverse diode D2 is connected to the second end of the power resistor R1, the positive electrode of the reverse diode D2 is connected to the emitter of the insulated gate bipolar transistor V2, and the negative electrode of the reverse diode D2 is connected to the second end of the power resistor R1; The first end of the power resistor R2 is connected to the ground grid. The second end of the power resistor R2 serves as the second access terminal and is connected to the screen door through a second connecting cable. The emitter of the insulated gate bipolar transistor V3 and the collector of the insulated gate bipolar transistor V4 are both connected to the first end of the power resistor R2. The negative electrode of the reverse diode D3 is connected to the collector of the insulated gate bipolar transistor V3, the positive electrode of the reverse diode D3 is connected to the second end of the power resistor R2, the positive electrode of the reverse diode D4 is connected to the emitter of the insulated gate bipolar transistor V4, and the negative electrode of the reverse diode D4 is connected to the second end of the power resistor R2; One end of the current measurement module SI is connected to the second end of the power resistor R1, and the other end of the current measurement module SI is connected to the second end of the power resistor R2; One end of the voltage measurement module SU is connected to the first end of the power resistor R1, and the other end of the voltage measurement module SU is connected to the second end of the power resistor R1.

2. The dynamic connection circuit between the platform screen door and the running rail of urban rail transit according to claim 1, characterized in that, It further includes a controller. The first output terminal of the controller is connected to the gate of the insulated gate bipolar transistor V1, the second output terminal of the controller is connected to the gate of the insulated gate bipolar transistor V2, the third output terminal of the controller is connected to the gate of the insulated gate bipolar transistor V3, and the fourth output terminal of the controller is connected to the gate of the insulated gate bipolar transistor V4.

3. The dynamic connection circuit between the platform screen door and the running rail of urban rail transit according to claim 1 or 2, characterized in that A freewheeling diode is respectively connected between the collector and emitter of the insulated gate bipolar transistor V1, between the collector and emitter of the insulated gate bipolar transistor V2, between the collector and emitter of the insulated gate bipolar transistor V3, and between the collector and emitter of the insulated gate bipolar transistor V4.

4. The dynamic connection circuit between the platform screen door and the running rail of urban rail transit according to claim 3, wherein It further includes an insulating housing. The power resistor R1, the insulated gate bipolar transistor V1, the insulated gate bipolar transistor V2, the reverse diode D1, the reverse diode D2, the power resistor R2, the insulated gate bipolar transistor V3, the insulated gate bipolar transistor V4, the reverse diode D3, the reverse diode D4, the current measurement module SI, the voltage measurement module SU, and the controller are all assembled in the insulating housing, and the first connecting cable passes through the first wire outlet hole on the insulating housing, and the second connecting cable passes through the second wire outlet hole on the insulating housing.

5. The dynamic connection circuit between the platform screen door and the running rail of urban rail transit according to claim 2, characterized in that, The controller is a PLC controller.

6. A dynamic control method for platform screen doors and running rails of urban rail transit, including a dynamic connection circuit for platform screen doors and running rails of urban rail transit according to any one of claims 1 to 5, characterized in that, The following steps are further included: When the train enters the station and the platform screen door opens, first control the insulated gate bipolar transistors V3 and V4 to remain non-conductive, and then detect the potential difference state between the current running rail and the platform screen door through the voltage measurement module SU; If the negative potential difference between the running rail and the platform screen door is small and less than the first set threshold, control the insulated gate bipolar transistor V1 to be non-conductive; if the negative potential difference between the running rail and the platform screen door is large and greater than the second set threshold, control the insulated gate bipolar transistor V1 to be conductive to make the running rail and the platform screen door negatively connected; if the positive potential difference between the running rail and the platform screen door is small and less than the third set threshold, control the insulated gate bipolar transistor V2 to be non-conductive, if the positive potential difference between the running rail and the platform screen door is large and greater than the fourth set threshold, control the insulated gate bipolar transistor V2 to be conductive to make the running rail and the platform screen door positively connected; When the train does not enter the station and passengers do not get on or off, control the insulated gate bipolar transistors V1 and V2 to remain non-conductive, and control the insulated gate bipolar transistors V3 and V4 to remain conductive.

7. A dynamic control method for a platform screen door and a running rail of an urban rail transit, characterized in that, When the insulated gate bipolar transistor V1 or V2 is conductive, calculate the self-insulation value of the platform screen door based on the detection results of the voltage measurement module SU and the current measurement module SI, and control the alarm device to emit a warning signal when the insulation value is low.

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