A door state indicating device

Abstract

The present invention discloses a door state indicating device, comprising: an indicator light for indicating the state of the door; and the state of the door includes an isolated state and a non-isolated state; a first switch respectively connected to a power supply and a mechanical isolation device; and when the door is isolated, the first switch is disconnected; when the door is not isolated, the first switch is closed; a first control device respectively connected to the first switch and the indicator light, for controlling the indicator light to correspondingly display the state of the door according to the opening and closing of the first switch; and a second control device respectively connected to the first switch, the first control device and the indicator light, for detecting whether the first control device is normal according to the opening and closing of the first switch, and controlling the indicator light to correspondingly display the state of the door when the first control device is abnormal. The present invention can still indicate to passengers and other personnel whether the door is successfully isolated through the second control device when the first control device is abnormal, thereby avoiding problems such as train delays on the main line and affecting passengers getting off.

Description

Technical Field

[0001] The present invention relates to the technical field of rail transit, and particularly to a door state indicating device for rail transit vehicles. Background Art

[0002] In the door isolation system of rail transit vehicles, the isolation device can mechanically isolate the door when a door failure occurs, so that the door is taken out of service; and when the door is in a normal state, the door isolation device does not work; the indicating device can display the door isolation state to inform the staff and passengers that the door is isolated and cannot be used.

[0003] For the existing indicating device, its working principle is as follows: when a door failure occurs on the train, the staff operates the isolation device and locks the door through the isolation lock in the isolation device; at the same time, the isolation switch in the indicating device is triggered to act, and the door isolation state signal is fed back to the signal acquisition circuit of the door controller. After being logically processed, the signal controls the internal circuit to output voltage to drive the indicator light in the indicating device to light up, thereby indicating that the door is in an isolated state. Since the isolation state of the door is first input to the door controller, and then the door controller controls the internal circuit and drives the indicator light to work. If the door controller itself is abnormal or the internal circuit fails, under this fault condition, after the staff mechanically isolates the door, the indicator light cannot indicate whether the door is successfully isolated, which may cause repeated on-site operations and confirmations, resulting in delays on the main line of the train, and at the same time, it will also affect passengers getting off. Therefore, it is necessary to improve and adjust the existing indicating device. Summary of the Invention

[0004] The purpose of the present invention is to provide a door state indicating device, when the first control device is abnormal, the second control device can control the indicator light to display the state of the door, and still be able to indicate to passengers and other personnel whether the door is successfully isolated.

[0005] In order to achieve the above object, the present invention is realized by the following technical solutions:

[0006] A door state indicating device is applied to a door isolation system; the door isolation system further includes a power supply and a mechanical isolation device, the power supply is used to supply power to the door state indicating device, and the mechanical isolation device is used to lock and isolate the door when a door failure occurs; the door state indicating device includes:

[0007] An indicator light for indicating the state of the door; and the state of the door includes an isolated state and a non-isolated state;

[0008] A first switch, which is respectively connected to the power supply and the mechanical isolation device; and when the door is isolated, the first switch is turned off; when the door is not isolated, the first switch is turned on.

[0009] A first control device, which is respectively connected to the first switch and the indicator light, and is used for controlling the indicator light to correspondingly display the state of the door according to the opening and closing of the first switch; and

[0010] A second control device, which is respectively connected to the first switch, the first control device and the indicator light, and is used for detecting whether the first control device is normal according to the opening and closing of the first switch, and controlling the indicator light to correspondingly display the state of the door when the first control device is abnormal.

[0011] Preferably, when the indicator light is on, it indicates that the door is in the isolated state; when the indicator light is off, it indicates that the door is in the non-isolated state.

[0012] Preferably, the first control device includes:

[0013] An internal power supply, which is used for supplying power to the indicator light;

[0014] A second switch, which is respectively connected to the internal power supply and the indicator light, and is used for controlling the on-off of the circuit between the internal power supply and the indicator light;

[0015] A state detection circuit, whose input end is connected to the first switch, and is used for detecting the opening and closing state of the first switch; and

[0016] A controller, whose input end is connected to the output end of the state detection circuit, and whose output end is connected to the second switch, and is used for controlling the opening and closing of the second switch according to the opening and closing state of the first switch, so as to control whether the indicator light is powered on and on.

[0017] Preferably, when the first switch is in the closed state, the controller controls the second switch to be turned off, and the indicator light is not powered on and not on;

[0018] When the first switch is in the open state, the controller controls the second switch to be turned on, and the indicator light is powered on and on.

[0019] Preferably, the second control device includes:

[0020] A third switch, which is respectively connected to the power supply and the indicator light, and is used for controlling the on-off of the circuit between the power supply and the indicator light;

[0021] A detection and control circuit, whose input terminals are respectively connected to the first switch and the second switch, and whose output terminal is connected to the third switch, is used to judge whether the first control device is normal according to the opening and closing states of the first switch and the second switch, so as to control the opening and closing of the third switch.

[0022] Preferably, when the first switch is in the off state and the second switch is in the on state, and the first control device is normal, the detection and control circuit controls the third switch to be off;

[0023] When the first switch is in the off state and the second switch is in the off state, and the first control device is abnormal, the detection and control circuit controls the third switch to be on, so that the indicator light is powered on and lights up.

[0024] Preferably, when the first switch is in the on state, the detection and control circuit controls the third switch to be off.

[0025] Preferably, the door state indicating device further includes: a first circuit breaker, whose input terminal is connected to the power supply, and whose output terminal is respectively connected to the first switch and the third switch, and is used for performing power supply overload protection on the first control device and the second control device.

[0026] Preferably, the door state indicating device further includes: a second circuit breaker, whose input terminal is connected to the power supply, and whose output terminal is respectively connected to the first switch and the third switch, and is used for performing power supply overload protection on the first control device and the second control device; and the second circuit breaker and the first circuit breaker are in parallel redundancy backup with each other.

[0027] Preferably, the input terminal of the controller is connected to the output terminal of the second circuit breaker, and is used for monitoring whether the second circuit breaker is normal, and for alarming when the second circuit breaker is abnormal.

[0028] Compared with the prior art, the present invention has at least one of the following advantages:

[0029] A door state indicating device provided by the present invention, the first control device can control the indicator light to correspondingly display the state of the door according to the opening and closing of the first switch; the second control device can detect whether the first control device is normal according to the opening and closing of the first switch, and can control the indicator light to correspondingly display the state of the door when the first control device is abnormal, thereby improving the reliability of the door state indicating device, and further avoiding the problems of train delay on the main line and affecting passengers getting off the train caused by repeated on-site operation and confirmation.

[0030] In the present invention, the controller in the first control device can generate corresponding control signals according to the switching states of the first switches conveyed by the state detection circuit to control the opening and closing of the second switches, thereby controlling the on-off of the circuit between the internal power supply and the indicator lights, and further controlling whether the indicator lights are powered on and lit to correspondingly display the state of the vehicle door.

[0031] In the present invention, the detection and control circuit in the second control device can judge whether the first control device is normal according to the opening and closing states of the first switch and the second switch and generate corresponding control signals to control the opening and closing of the third switch, so that when the first control device is abnormal (for example, the state detection circuit is abnormal, the controller is abnormal, or the internal power supply is abnormal), the circuit between the power supply and the indicator light is conducted, and further the indicator light is powered on and lit, and still can indicate to passengers and other personnel that the vehicle door is in the isolated state.

[0032] In the present invention, the first circuit breaker and the second circuit breaker are in parallel redundant backup with each other, and can still ensure the availability of the circuit between the power supply and the first control device and the second control device and continue to perform power supply overload protection when any one of the circuit breakers is abnormal (for example, trips), thereby improving the reliability of the vehicle door state indicating device, and further still being able to continue to indicate the state of the vehicle door to passengers and staff.

[0033] When the second circuit breaker in the present invention is abnormal, the controller will also issue a warning, so that the staff can timely repair or replace the circuit, the second circuit breaker and the first circuit breaker, thereby improving the reliability of the vehicle door state indicating device. Description of the Drawings

[0034] Figure 1 is a schematic structural diagram of the closing of the first switch in a vehicle door state indicating device provided by an embodiment of the present invention;

[0035] Figure 2 is a schematic structural diagram of the first switch being disconnected and the second switch being closed in a vehicle door state indicating device provided by an embodiment of the present invention;

[0036] Figure 3 is a schematic structural diagram of the first switch being disconnected and the third switch being closed in a vehicle door state indicating device provided by an embodiment of the present invention. Detailed Embodiments

[0037] The following further describes in detail a door state indicating device proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings are in a very simplified form and use non-precise scales, only for conveniently and clearly assisting in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and understandable, please refer to the accompanying drawings. It should be known that the structures, scales, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have any technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that the technical content disclosed by the present invention can cover.

[0038] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the said element.

[0039] Combined with the attached Figures 1 to 3As shown in the figure, this embodiment provides a door state indicating device, which is applied to a door isolation system; the door isolation system further includes a power supply 100 and a mechanical isolation device 101. The power supply 100 is used to supply power to the door state indicating device, and the mechanical isolation device 101 is used to lock and isolate the door in case of a door failure; the door state indicating device includes: an indicator light 210, which is used to indicate the state of the door; and the state of the door includes an isolated state and a non-isolated state; a first switch 220, which is respectively connected to the power supply 100 and the mechanical isolation device 101; and when the door is isolated, the first switch 220 is disconnected; when the door is not isolated, the first switch 220 is closed; a first control device 230, which is respectively connected to the first switch 220 and the indicator light 210, and is used to control the indicator light 210 to correspondingly display the state of the door according to the opening and closing of the first switch 220; and a second control device 240, which is respectively connected to the first switch 220, the first control device 230 and the indicator light 210, and is used to detect whether the first control device 230 is normal according to the opening and closing of the first switch 220, and when the first control device 230 is abnormal, control the indicator light 210 to correspondingly display the state of the door.

[0040] Specifically, in this embodiment, when the indicator light 210 is on, it indicates that the door is in the isolated state; when the indicator light 210 is not on, it indicates that the door is in the non-isolated state. Under certain application conditions, the indicator light 210 can also flash, but the present invention is not limited thereto.

[0041] In other embodiments, the indicator light 210 can also indicate different states of the door by lighting different colors of lights. For example, when the red light in the indicator light 210 is on, it indicates that the door is in the isolated state, and when the green light is on, it indicates that the door is in the non-isolated state, but the present invention is not limited thereto.

[0042] Specifically, in this embodiment, the first switch 220 is a microswitch for sensing the state of the vehicle door. Its stationary contact can be connected to the power supply 100, and its movable contact can be linked with the mechanical isolation device 101. Moreover, the first switch 220 can be triggered by the mechanical isolation device 101. More specifically, when the vehicle door is not faulty, i.e., under normal circumstances, the mechanical isolation device 101 does not work. At this time, the first switch 220 is in a closed state. When the vehicle door malfunctions, the staff operates the mechanical isolation device 101 and locks and isolates the vehicle door through the isolation lock in the mechanical isolation device 101. At this time, the mechanical isolation device 101 works and triggers the first switch 220 to open. Therefore, the first control device 230 and the second control device 240 can judge the state of the vehicle door according to the open / closed state of the first switch 220, thereby controlling whether the indicator light 210 lights up, and further indicating the state of the vehicle door to passengers and staff. However, the present invention is not limited thereto.

[0043] Please also refer to Figure 1 and Figure 2 , the first control device 230 includes: an internal power supply 2301 for supplying power to the indicator light 210; a second switch 2302 connected to the internal power supply 2301 and the indicator light 210 respectively for controlling the on / off of the circuit between the internal power supply 2301 and the indicator light 210; a state detection circuit 2303 whose input end is connected to the first switch 220 for detecting the open / closed state of the first switch 220; and a controller 2304 whose input end is connected to the output end of the state detection circuit 2303 and whose output end is connected to the second switch 2302 for controlling the on / off of the second switch 2302 according to the open / closed state of the first switch 220 to control whether the indicator light 210 is powered on and lights up.

[0044] It can be understood that in some other embodiments, when the first switch 220 is in a closed state, the controller 2304 controls the second switch 2302 to open, and the indicator light 210 is not powered on and does not light up. When the first switch 220 is in an open state, the controller 2304 controls the second switch 2302 to close, and the indicator light 210 is powered on and lights up.

[0045] Specifically, in this embodiment, the stationary contact of the second switch 2302 can be connected to the internal power supply 2301, and the movable contacts of the second switch 2302 are respectively connected to the output terminal of the controller 2304 and the indicator light 210. The input terminal of the status detection circuit 2303 can be connected to the movable contact of the first switch 220; when the first switch 220 is in the closed state, the status detection circuit 2303 can detect a closed signal and output it to the controller 2304; when the first switch 220 is triggered by the mechanical isolation device 101 to be in the open state, the status detection circuit 2303 can detect an open signal and output it to the controller 2304, but the present invention is not limited thereto.

[0046] Specifically, in this embodiment, the controller 2304, as the central processing unit of the first control device 230, can process the signals transmitted by the status detection circuit 2303 and generate control signals to control the opening and closing of the second switch 2302, thereby controlling the on-off of the circuit between the internal power supply 2301 and the indicator light 210, and further controlling whether the indicator light 210 is powered on and lit. More specifically, after logically processing the closed signal, the controller 2304 generates a first control signal and outputs it to the second switch 2302, causing the second switch 2302 to open according to the first control signal (as Figure 1 shown), at this time the circuit between the internal power supply 2301 and the indicator light 210 is disconnected, and the indicator light 210 is not powered on and not lit, indicating to passengers and other personnel that the door is in a non-isolated state; after logically processing the open signal, the controller 2304 generates a second control signal and outputs it to the second switch 2302, causing the second switch 2302 to close according to the second control signal (as Figure 2 shown), at this time the circuit between the internal power supply 2301 and the indicator light 210 is conducting, and the indicator light 210 is powered on and lit, indicating to passengers and other personnel that the door is in an isolated state. Preferably, the second switch 2302 can be a relay or a power semiconductor switch, but the present invention is not limited thereto.

[0047] Please continue to refer to Figure 3, the second control device 240 includes: a third switch 2401, which is respectively connected to the power supply 100 and the indicator light 210, and is used to control the on-off of the circuit between the power supply 100 and the indicator light 210; a detection control circuit 2402, whose input end is respectively connected to the first switch 220 and the second switch 2302, and whose output end is connected to the third switch 2401, and is used to judge whether the first control device 230 is normal according to the opening and closing states of the first switch 220 and the second switch 2302, so as to control the opening and closing of the third switch 2401.

[0048] It can be understood that in some other embodiments, the first switch 220 is in an open state and the second switch 2302 is in a closed state, the first control device 230 is normal, and the detection control circuit 2402 controls the third switch 2401 to be disconnected; the first switch 220 is in an open state and the second switch 2302 is in an open state, the first control device 230 is abnormal, and the detection control circuit 2402 controls the third switch 2401 to be closed so that the indicator light 210 is powered on and lit.

[0049] In some embodiments, the first switch 220 is in a closed state, and the detection control circuit 2402 controls the third switch 2401 to be disconnected.

[0050] Specifically, in this embodiment, the stationary contact of the third switch 2401 can be connected to the power supply 100, and the movable contact of the third switch 2401 is respectively connected to the output end of the detection control circuit 2402 and the indicator light 210. The input ends of the detection control circuit 2402 can be respectively connected to the movable contact of the first switch 220 and the movable contact of the second switch 2302, and the output end of the detection control circuit 2402 is connected to the movable contact of the third switch 2401; and the detection control circuit 2402 can generate a control signal according to the states of the first switch 220 and the second switch 2302 to control the opening and closing of the third switch 2401, so as to control the on-off of the circuit between the power supply 100 and the indicator light 210, and further control whether the indicator light 210 is powered on and lit, but the present invention is not limited thereto.

[0051] More specifically, when the detection control circuit 2402 detects that the first switch 220 is in an open state and the second switch 2302 is in a closed state, it judges that the first control device 230 is normal and generates a third control signal to output to the third switch 2401, and the third switch 2401 is disconnected according to the third control signal (such as Figure 2As shown, at this time, the first control device 230 controls the indicator light 210 to turn on, so as to indicate to passengers and other personnel that the door is in the isolated state. When the detection control circuit 2402 detects that both the first switch 220 and the second switch 2302 are in the off state, it determines that the first control device 230 is abnormal (at this time, it may be that the state detection circuit is abnormal, the controller is abnormal, or the internal power supply is abnormal), and generates a fourth control signal to output to the third switch 2401. The third switch 2401 closes according to the fourth control signal (as Figure 3 shown). At this time, the circuit between the power supply 100 and the indicator light 210 is turned on, and the indicator light 210 is powered on and turned on, so that when the first control device 230 is abnormal, it can still indicate to passengers and other personnel that the door is in the isolated state, thereby improving the reliability of the door state indicating device. When the detection control circuit 2402 detects that the first switch 220 is in the closed state, it directly generates a fifth control signal to output to the third switch 2401. The third switch 2401 disconnects according to the fifth control signal (as Figure 1 shown), so that the indicator light 210 is only controlled by the first control device 230. Preferably, the third switch 2401 can adopt a relay or a power semiconductor switch. When the detection control circuit 2402 detects that there is no current signal output from the second switch 2302, it determines that the second switch 2302 is in the off state, but the present invention is not limited thereto.

[0052] Please also refer to Figure 1 、 Figure 2 and Figure 3 , the door state indicating device further includes: a first circuit breaker 250, whose input end is connected to the power supply 100, and whose output end is respectively connected to the first switch 220 and the third switch 2401, and is used for protecting the first control device 230 and the second control device 240 against overloading of the power supply.

[0053] It can be understood that in some other embodiments, the door state indicating device further includes: a second circuit breaker 260, whose input end is connected to the power supply 100, and whose output end is respectively connected to the first switch 220 and the third switch 2401, and is used for protecting the first control device 230 and the second control device 240 against overloading of the power supply; and the second circuit breaker 260 and the first circuit breaker 250 are in parallel redundant backup with each other.

[0054] In some embodiments, the input end of the controller 2304 is connected to the output end of the second circuit breaker 260, and is used for monitoring whether the second circuit breaker 260 is normal, and for alarming when the second circuit breaker 260 is abnormal.

[0055] Specifically, when the circuits between the power supply 100, the first control device 230, and the second control device 240 are normal, the first circuit breaker 250 and the second circuit breaker 260 are both in the closed state; when the circuits between the power supply 100, the first control device 230, and the second control device 240 are overloaded, the first circuit breaker 250 and the second circuit breaker 260 are in the open state to prevent the first control device 230 and the second control device 240 from being burned out. At this time, the controller 2301 connected to the second circuit breaker 250 will also issue a warning, enabling the staff to timely repair or replace the circuit, the second circuit breaker 260, and the first circuit breaker 250, thereby improving the reliability of the door status indicating device. However, the present invention is not limited thereto.

[0056] More specifically, the first circuit breaker 250 and the second circuit breaker 260 are in parallel redundant backup with each other, and can still ensure the availability of the circuit between the power supply 100, the first control device 230, and the second control device 240 and continue to perform power overload protection when any one of the circuit breakers is abnormal (such as tripping), thereby improving the reliability of the door status indicating device, and further still being able to continue to indicate the status of the door to passengers and staff. However, the present invention is not limited thereto.

[0057] In this embodiment, the output end of the first circuit breaker 250 can be connected to the stationary contact of the first switch 220, and the output end of the second circuit breaker 260 is respectively connected to the stationary contact of the first switch and the stationary contact of the third switch 2401. Diodes are respectively connected in series between the first circuit breaker 250 and the second circuit breaker 260 and the first switch 220, and between the second switch 2302 and the third switch 2401 and the indicator light 210 to ensure the unidirectional flow of current.

[0058] In addition, in some embodiments, the mechanical isolation device 101 and the first switch 220 are also linked with a fourth switch 300 in the door safety circuit; and when the door is not isolated, that is, when the first switch 220 is closed, the fourth switch 300 is open; when the door is isolated, that is, when the first switch 220 is open, the fourth switch 300 is closed to bypass the door safety circuit, thereby maintaining the closure of the door safety interlock circuit of the entire train. However, the present invention is not limited thereto.

[0059] In summary, this embodiment provides a door state indicating device. The first control device can control the indicator light to correspondingly display the door state according to the opening and closing of the first switch; the second control device can detect whether the first control device is normal according to the opening and closing of the first switch, and control the indicator light to correspondingly display the door state when the first control device is abnormal, thereby improving the reliability of the door state indicating device, and further avoiding the problems of train delay on the main line and affecting passengers getting off due to repeated on-site operation and confirmation. In this embodiment, the first circuit breaker and the second circuit breaker are in parallel redundant backup with each other, and can still ensure the availability of the circuit between the power supply and the first control device and the second control device and continue to perform power supply overload protection when any circuit breaker is abnormal (such as tripping), thereby improving the reliability of the door state indicating device, and further still being able to continue to indicate the state of the door to passengers and staff.

[0060] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation of the present invention. After those skilled in the art have read the above content, various modifications and alternatives to the present invention will be obvious. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims

1. A door state indicating device is applied to a door isolation system; the door isolation system further includes a power supply (100) and a mechanical isolation device (101), the power supply (100) is used to supply power to the door state indicating device, and the mechanical isolation device (101) is used to lock and isolate the door in case of door failure; characterized in that, The door state indicating device includes: An indicator light (210) for indicating the state of the door; and the state of the door includes an isolated state and a non-isolated state; A first switch (220) connected to the power supply (100) and the mechanical isolation device (101) respectively; when the door is isolated, the first switch (220) is disconnected; when the door is not isolated, the first switch (220) is closed; A first control device (230) connected to the first switch (220) and the indicator light (210) respectively, for controlling the indicator light (210) to correspondingly display the state of the door according to the opening and closing of the first switch (220); and A second control device (240) connected to the first switch (220), the first control device (230) and the indicator light (210) respectively, for detecting whether the first control device (230) is normal according to the opening and closing of the first switch (220), and controlling the indicator light (210) to correspondingly display the state of the door when the first control device (230) is abnormal; When the indicator light (210) is on, it indicates that the door is in the isolated state; when the indicator light (210) is not on, it indicates that the door is in the non-isolated state; The first control device (230) includes: An internal power supply (2301) for supplying power to the indicator light (210); A second switch (2302) connected to the internal power supply (2301) and the indicator light (210) respectively, for controlling the on-off of the circuit between the internal power supply (2301) and the indicator light (210); A state detection circuit (2303) whose input end is connected to the first switch (220), for detecting the opening and closing state of the first switch (220); and A controller (2304) whose input end is connected to the output end of the state detection circuit (2303), and whose output end is connected to the second switch (2302), for controlling the opening and closing of the second switch (2302) according to the opening and closing state of the first switch (220), so as to control whether the indicator light (210) is powered on and lit; The second control device (240) includes: A third switch (2401) connected to the power supply (100) and the indicator light (210) respectively, for controlling the on-off of the circuit between the power supply (100) and the indicator light (210); A detection control circuit (2402) whose input ends are respectively connected to the first switch (220) and the second switch (2302), and whose output end is connected to the third switch (2401), for judging whether the first control device (230) is normal according to the opening and closing states of the first switch (220) and the second switch (2302), so as to control the opening and closing of the third switch (2401); The first switch (220) is in an open state and the second switch (2302) is in a closed state. The first control device (230) is normal, and the detection and control circuit (2402) controls the third switch (2401) to open; The first switch (220) is in an open state and the second switch (2302) is in an open state. The first control device (230) is abnormal, and the detection and control circuit (2402) controls the third switch (2401) to close so that the indicator light (210) is powered on and lit; The first switch (220) is in a closed state, and the detection and control circuit (2402) controls the third switch (2401) to open.

2. The door state indicating device according to claim 1, wherein The first switch (220) is in a closed state, the controller (2304) controls the second switch (2302) to open, and the indicator light (210) is not powered on and not lit; The first switch (220) is in an open state, the controller (2304) controls the second switch (2302) to close, and the indicator light (210) is powered on and lit.

3. The door state indicating device according to claim 1, characterized in that, It further includes: A first circuit breaker (250), whose input end is connected to the power supply (100), and whose output end is respectively connected to the first switch (220) and the third switch (2401), for providing over-power protection for the first control device (230) and the second control device (240).

4. The door state indicating device according to claim 3, characterized in that, It further includes: A second circuit breaker (260), whose input end is connected to the power supply (100), and whose output end is respectively connected to the first switch (220) and the third switch (2401), for providing over-power protection for the first control device (230) and the second control device (240); and the second circuit breaker (260) and the first circuit breaker (250) are in parallel redundant backup with each other.

5. The door state indicating device according to claim 4, characterized in that, The input end of the controller (2304) is connected to the output end of the second circuit breaker (260), for monitoring whether the second circuit breaker (260) is normal and giving an alarm when the second circuit breaker (260) is abnormal.

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