Access control state early warning circuit and device

Abstract

The utility model discloses an access control state early warning circuit and device. The circuit comprises a power supply module; the early warning control module comprises a state monitoring device for monitoring the state of the door body, and the early warning control module is connected with the external monitoring module and used for generating a trigger signal according to a state monitoring signal of the state monitoring device or generating the trigger signal according to a door magnetic induction signal output by the external monitoring module; the alarm module comprises two alarms with different alarm types; the control end of the switch module is connected with the early warning control module, and the switch module is connected between the power supply module and the alarm module and is used for responding to the trigger signal to enable one alarm to be communicated with the power supply module and switching to enable the other alarm to be communicated with the power supply module after a preset duration is delayed. According to the embodiment of the invention, entrance guard early warning can be realized through different triggering modes, and related personnel are prompted whether the door body is opened for a long time or not through different alarms, so that the stability, accuracy and reliability of early warning are improved.

Description

Technical Field

[0001] The present application belongs to the technical field of infrastructure maintenance and security management, and in particular, relates to a door access status warning circuit and device. Background Art

[0002] The access control of the computer room or related integrated areas is usually based on the environmental monitoring system for early warning and management. If the relevant personnel forget to close the door or the door is open for too long, it is easy to cause the leakage of equipment and related information in the computer room.

[0003] The opening of the computer room door will also cause the temperature of the room to rise due to the temperature exchange between the air inside and outside the room. In order to avoid the room's ambient temperature being too high, the cooling efficiency and cooling capacity of the refrigeration equipment need to be improved, which will greatly increase the PUE (Power Usage Effectiveness) index and power consumption of the room. In addition, the opening of the door will also bring certain hidden dangers to the safe operation of the equipment in the room.

[0004] The current access control warning management method is mainly through the dynamic environment monitoring system, which generates a corresponding digital signal according to the door magnetic induction trigger when the access control is opened, and sends it to the host computer after signal processing, so that the relevant personnel in the monitoring center can handle it immediately. However, the above solution can only provide early warning reminders to the monitoring personnel, and it is also necessary to notify the relevant personnel near the computer room to handle it. The number of links involved is large and the processing time is long, which is not conducive to the standardization and safety management of the computer room or comprehensive area. Utility Model Content

[0005] The embodiments of the present application provide a door access status warning circuit and device, which can improve the related defects of computer room door access warning management.

[0006] In a first aspect, an embodiment of the present application provides a door access status warning circuit, comprising:

[0007] Power module;

[0008] An early warning control module, including a state monitoring device for monitoring the state of the door body, the early warning control module is used to connect to the external monitoring module, and is used to generate a trigger signal according to the state monitoring signal of the state monitoring device, or to generate a trigger signal according to the door magnetic induction signal output by the external monitoring module;

[0009] An alarm module, including two alarms with different alarm types;

[0010] A switch module, a control end of the switch module is connected to the early warning control module, and the switch module is connected between the power module and the alarm module; the switch module is used to connect one of the alarms to the power module in response to a trigger signal, and switch the alarm connected to the power module to another alarm after a preset delay.

[0011] In some embodiments, the switch module includes:

[0012] An intermediate relay module, a first end of the intermediate relay module is connected to the power module, a control end of the intermediate relay module is connected to the early warning control module, and the intermediate relay module is used to be turned on in response to a trigger signal;

[0013] A delay switching module, wherein the first end and the control end of the delay switching module are connected to the second end of the intermediate relay module, and the second end and the third end of the delay switching module are respectively connected to two alarms; the delay switching module is used to connect the first end with the second end in response to the power signal of the power module, and after a preset delay period, switch the connection between the first end and the third end.

[0014] In some embodiments, the intermediate relay module includes one intermediate relay or at least two intermediate relays connected in series.

[0015] In some embodiments, the two alarms are any two of a buzzer alarm, an audible and visual alarm, a lighting warning device, a voice warning device, or a photographing warning device.

[0016] In some embodiments, the early warning control module further includes:

[0017] A reverse power protection unit, wherein two input terminals of the reverse power protection unit are respectively connected to the output terminals of the state monitoring device and the external monitoring module, and the output terminal of the reverse power protection unit is connected to the control terminal of the switch module.

[0018] In some embodiments, the reverse power protection unit includes:

[0019] a first diode, wherein an anode of the first diode is connected to the state monitoring device, and a cathode of the first diode is connected to a control terminal of the switch module;

[0020] A second diode, wherein an anode of the second diode is connected to the output end of the external monitoring module, and a cathode of the second diode is connected to the control end of the switch module.

[0021] In some embodiments, the state monitoring device is connected between the first diode and the power module.

[0022] In some embodiments, the external monitoring module is a dynamic environment monitoring system, and the DC power supply of the dynamic environment monitoring system is reused as a power supply module.

[0023] In some embodiments, the state monitoring device is one of a travel switch, a position sensor, a micro switch or a position relay.

[0024] In a second aspect, an embodiment of the present application provides a door access status warning device, comprising the door access status warning circuit of the first aspect.

[0025] Compared with the prior art, the access control state warning circuit and device provided in the embodiment of the present application can trigger the warning control module to generate a trigger signal by setting a warning control module and a switch module. One method is to generate a trigger signal by using a state monitoring signal generated by a state monitoring device that monitors the state of the door body when the door body is opened, and the other method is to generate a trigger signal by using a door magnetic induction signal generated by the door magnetic induction of the external monitoring module when the door body is opened. When any triggering method is effective, the switch module can be turned on, and the alarm module is powered by the power module to realize an alarm prompt when the door body is opened. The two triggering implementation methods can be mutually primary and standby, which improves the stability, accuracy and reliability of the access control warning. In addition, when the switch module is turned on, one of the alarms will be connected to the power module first, and after a preset delay, it will be switched to another alarm to connect to the power module. Relevant personnel in the nearby area can determine whether the door body remains open for a long time based on the alarm prompt of the alarm 31, so as to remind relevant personnel to close the door body in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a schematic diagram of the module structure of a door access status warning circuit provided in an embodiment of the present application;

[0028] Figure 2 It is a schematic diagram of the module structure of a door access status warning circuit provided by another embodiment of the present application;

[0029] Figure 3 It is a circuit structure diagram of a door access status warning circuit provided in one embodiment of the present application.

[0030] In the attached figure:

[0031] 10. Power supply module; 20. Early warning control module; 21. Status monitoring device; 30. Alarm module; 40. Switch module; 50. External monitoring module; 31. Alarm; 41. Intermediate relay module; 42. Delay switching module; 22. Reverse power protection unit; D1. First diode; D2. Second diode. DETAILED DESCRIPTION

[0032] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. 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 terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0034] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The embodiments will be described in detail below in conjunction with the accompanying drawings.

[0035] The access control of the computer room or related integrated areas is usually based on the environmental monitoring system for early warning and management. If the relevant personnel forget to close the door or the door is open for too long, it is easy to cause the leakage of equipment and related information in the computer room.

[0036] The opening of the computer room door will also cause the temperature of the room to rise due to the temperature exchange between the air inside and outside the room. In order to avoid the room's ambient temperature being too high, the cooling efficiency and cooling capacity of the refrigeration equipment need to be improved, which will greatly increase the PUE (Power Usage Effectiveness) index and power consumption of the room. In addition, the opening of the door will also bring certain hidden dangers to the safe operation of the equipment in the room.

[0037] The current access control warning management method is mainly through the dynamic environment monitoring system, which generates a corresponding digital signal according to the door magnetic induction trigger when the access control is opened, and sends it to the host computer after signal processing, so that the relevant personnel in the monitoring center can handle it immediately. However, the above solution can only provide early warning reminders to the monitoring personnel, and it is also necessary to notify the relevant personnel near the computer room to handle it. The number of links involved is large and the processing time is long, which is not conducive to the standardization and safety management of the computer room or comprehensive area.

[0038] In order to solve the above technical problems, the embodiment of the present application provides a door access status warning circuit and device. The door access status warning circuit provided by the embodiment of the present application is first introduced below.

[0039] Figure 1 The schematic diagram of the structure of the access control state warning circuit provided by an embodiment of the present application is shown. The access control state warning circuit comprises a power supply module 10, a warning control module 20, an alarm module 30 and a switch module 40.

[0040] The power module 10 can provide a power signal. The early warning control module 20 may include a state monitoring device 21 for monitoring the state of the door body, and the state monitoring device 21 may generate different state monitoring signals according to whether the door body is in an open state or a closed state. The early warning control module 20 may generate a trigger signal according to the state monitoring signal of the state monitoring device 21. For example, when the state monitoring signal generated by the state monitoring device 21 corresponds to the door body state being in an open state, the early warning control module 20 may generate a trigger signal.

[0041] The early warning control module 20 can be connected to the external monitoring module 50. When the external monitoring module 50 detects that the door is opened through door magnetic induction, it can output a corresponding door magnetic induction signal. The early warning control module 20 can generate a trigger signal based on the door magnetic induction signal.

[0042] The early warning control module 20 can be triggered in two ways. One of the triggering ways is that after the door body is opened, the state monitoring signal generated by the state monitoring device 21 triggers the early warning control module 20 to generate a trigger signal; the other triggering way is that when the door body is opened, the external monitoring module 50 can generate a corresponding digital quantity signal through door magnetic induction, and after data processing, generate a digital level signal as a door magnetic induction signal, which triggers the early warning control module 20 to generate a trigger signal.

[0043] When the door is opened, as long as any one of the two triggering methods is valid, the warning control module 20 can generate a trigger signal, thereby avoiding the problem of failure to provide warning when a fault occurs in the single triggering method, and improving the overall warning accuracy and system stability.

[0044] The alarm module 30 may include two alarms 31 of different alarm types, and the two alarms 31 may be respectively connected to the switch module 40. The alarm types of the two alarms 31 are different, and the alarm prompts issued by the two alarms 31 may be different, for example, one alarm 31 may issue a buzzer alarm, and the other alarm 31 may be an audible and visual alarm.

[0045] The switch module 40 is connected between the power module 10 and the alarm module 30, and the control end of the switch module 40 can be connected to the early warning control module 20. When the early warning control module 20 generates a trigger signal, the switch module 40 can connect one of the two alarms 31 to the power module 10 in response to the trigger signal, and the power module 10 can supply power to the alarm 31 to enable the alarm 31 to operate and issue an alarm prompt. The alarm prompt can be a buzzer prompt, or an audio-visual prompt, a lighting prompt, a voice prompt, etc., which is not limited here.

[0046] The switch module 40 also has a delay control function. When one of the alarms 31 is connected to the power module 10 in response to a trigger signal, timing can be started, and after the timing reaches a preset time, the alarm 31 connected to the power module 10 is switched to the other alarm 31. That is, when the door is opened, one of the two alarms 31 issues an alarm prompt, and after a period of time, the alarm 31 stops alarming and switches to the other alarm 31 for alarm prompting.

[0047] When the relevant personnel are in the prompt area of ​​the alarm 31, the time for the door body to remain open can be determined according to the type of alarm prompt. For example, if the alarm 31 that first issues an alarm prompt is a buzzer alarm 31 and the alarm 31 that issues an alarm prompt later is an audible and visual alarm 31, when the relevant personnel sense that the buzzer alarm 31 is running, they can determine that the door body is open for a short time at this time, and when they sense that the audible and visual alarm 31 is running, they can determine that the door body has been open for more than the preset delay time and the door body needs to be closed as soon as possible.

[0048] In this embodiment, by setting the early warning control module 20 and the switch module 40, the early warning control module 20 can be triggered to generate a trigger signal through two different triggering methods. One method is to generate a trigger signal by using the state monitoring signal generated by the state monitoring device 21 that monitors the state of the door body when the door body is opened, and the other method is to generate a trigger signal by using the door magnetic induction signal generated by the door magnetic induction of the external monitoring module 50 when the door body is opened. When any triggering method is effective, the switch module 40 can be turned on, and the alarm module 30 is powered by the power module 10 to realize the alarm prompt when the door body is opened. The two triggering implementation methods can be mutually primary and standby, which improves the stability, accuracy and reliability of the access control early warning. When the switch module 40 is turned on, one of the alarms 31 will be connected to the power module 10 first, and after a preset delay, it will switch to another alarm 31 to connect to the power module 10. Relevant personnel in the nearby area can determine whether the door body remains open for a long time based on the alarm prompt of the alarm 31, so as to remind relevant personnel to close the door body in time.

[0049] Please refer to Figure 2 In some embodiments, the switch module 40 may include an intermediate relay module 41 and a delay switching module 42 .

[0050] A first end of the intermediate relay module 41 is connected to the power module 10, and a control end of the intermediate relay module 41 is connected to the early warning control module 20. The intermediate relay module 41 can be turned on in response to a trigger signal.

[0051] The first end and the control end of the delay switching module 42 are connected to the second end of the intermediate relay module 41 , and the second end and the third end of the delay switching module 42 are connected to the two alarms 31 respectively.

[0052] The early warning control module 20 may send a trigger signal to the intermediate relay module 41 based on the door magnetic induction signal output by the external monitoring module 50 , or may send a trigger signal to the intermediate relay module 41 based on the status monitoring signal of the status monitoring device 21 .

[0053] When the intermediate relay module 41 is turned on in response to the trigger signal, the first end and the control end of the delay switching module 42 receive the power signal of the power module 10. At this time, the delay switching module 42 can connect the first end with the second end in response to the power signal of the power module 10. That is, the alarm 31 connected to the second end of the delay switching module 42 can receive the power signal and operate the alarm under the power supply of the power signal.

[0054] When the delay switching module 42 connects the first end with the second end, it can start timing, and after the timing time reaches the preset delay time, the connection between the first end and the second end is switched to the connection between the first end and the third end. At this time, the alarm 31 connected to the second end of the delay switching module 42 stops working, and the alarm 31 connected to the third end of the delay switching module 42 starts working.

[0055] The delay switching module 42 may be a delay relay, or other modules or devices capable of implementing a delay switching action.

[0056] In some embodiments, the intermediate relay module 41 may include one intermediate relay or at least two intermediate relays connected in series.

[0057] Through one intermediate relay or a plurality of intermediate relays connected in series, when the early warning control module 20 generates a trigger signal, the power signal of the power module 10 can be transmitted to the delay switching module 42.

[0058] Please refer to Figure 3 In some embodiments, the early warning control module 20 may further include a reverse power protection unit 22 .

[0059] Two input ends of the reverse power protection unit 22 are connected to the output ends of the state monitoring device 21 and the external monitoring module 50 respectively, and the output end of the reverse power protection unit 22 is connected to the control end of the switch module 40 .

[0060] The reverse power protection unit 22 can perform reverse power protection on the two input terminals to prevent the signal of one input terminal from flowing into the other input terminal and causing damage to the device, thereby improving the safety and stability of the access control status warning.

[0061] In some embodiments, the reverse power protection unit 22 may include a first diode D1 and a second diode D2 .

[0062] An anode of the first diode D1 is connected to the state monitoring device 21 , and a cathode of the first diode D1 is connected to the control end of the switch module 40 .

[0063] An anode of the second diode D2 is connected to the output end of the external monitoring module 50 , and a cathode of the second diode D2 is connected to the control end of the switch module 40 .

[0064] The first diode D1 can prevent the level signal outputted from the output end of the external monitoring module 50 from flowing into the state monitoring device 21 , and the second diode D2 can prevent the state monitoring signal outputted from the state monitoring device 21 from flowing into the external monitoring module 50 .

[0065] The first diode D1 and the second diode D2 can ensure that the two trigger modes do not interfere with each other. When one of the trigger architectures fails, the other trigger architecture intervenes without interruption, thereby improving the overall warning accuracy and system stability.

[0066] In some embodiments, Figure 3 As shown, the state monitoring device 21 may be connected between the first diode D1 and the power module 10 .

[0067] The state monitoring device 21 can be turned on when the door body is in the open state. When the state monitoring device 21 is turned on, the power signal output by the power module 10 can be transmitted to the control end of the switch module 40 through the first diode D1, which is equivalent to the state monitoring device 21 generating a state monitoring signal when the door body is opened and sending it to the switch module 40. For example, the state monitoring device 21 can be a travel micro switch set on the door body, which is turned on when the door body is opened and disconnected when the door body is closed in the form of a contact buckle.

[0068] In some embodiments, the external monitoring module 50 may be a dynamic environment monitoring system (Supervision System). Taking the door body as the door body of the machine room as an example, a dynamic environment monitoring system is usually installed in the machine room, which can perform telemetry, telesignaling, teleadjustment and remote control on various power equipment such as power cabinets, UPS (Uninterrupted Power Supply), air conditioners, batteries, and other power equipment distributed in the machine room, as well as various parameters of the machine room environment such as door magnets, infrared, broken windows, water immersion, temperature and humidity, and smoke sensors, monitor their operating parameters in real time, diagnose and handle faults, record and analyze relevant data, and perform centralized monitoring and centralized maintenance of the equipment. The dynamic environment monitoring system can usually be connected to a pair of door magnet reed switches arranged on the door body. When the door body is opened, the paired door magnet reed switches sense and trigger different digital signals due to the distance being pulled far or close, and the dynamic environment monitoring system can use the digital signal as a door magnet induction signal.

[0069] When the external monitoring module 50 is a dynamic environment monitoring system, the DC power supply of the dynamic environment monitoring system can be reused as the power supply module 10 .

[0070] Since the FSU (Field supervision unit, base station intelligent dynamic environment monitoring unit) controller in the dynamic environment monitoring system needs to provide voltage for power supply, the dynamic environment monitoring system usually includes a DC power supply. Provide the corresponding power supply voltage for the dynamic environment monitoring system, such as 12V or 24V DC voltage. At this time, the DC power supply can be used as the power module 10 of the access control status warning circuit to realize the access control status warning.

[0071] It is understandable that, in addition to the DC power supply corresponding to the dynamic environment monitoring system, other DC power supplies in the machine room can also be used as the power supply module 10. According to the specific power supply module 10 used and the DC voltage it can provide, a suitable state monitoring device 21, relay and alarm 31 can be selected. For example, when the DC power supply provides 24VDC, the relay and alarm 31 can select a +24V relay and an alarm 31 whose rated voltage matches 24VDC.

[0072] In some embodiments, the state monitoring device 21 may be one of a travel switch, a position sensor, a micro switch or a position relay, and the state monitoring device 21 may be arranged on the door of the machine room. Taking the state monitoring device 21 as a travel switch, a micro switch or a position relay as an example, when the door is closed, the state monitoring device 21 is in an off state; when the door is opened, the state monitoring device 21 is in an on state.

[0073] As an optional implementation, Figure 3 As shown, the external monitoring module 50 can generate a corresponding DI signal when the door is opened through door magnetic induction. After the external monitoring module 50 processes the signal, it can output a DO digital level signal. The DO digital level signal can be used as a door magnetic induction signal and input into the intermediate relay module 41 through the second diode D2.

[0074] Figure 3 In the embodiment, pins 5, 9, 13, and 14 of the intermediate relay module 41 are the second terminal, the first terminal, the control terminal, and the ground terminal, respectively. When pin 13 receives a high level signal, the relay switch in the intermediate relay module 41 is turned on, connecting the first terminal with the second terminal, so that the power signal of the power module 10 is output to the delay switching module.

[0075] When the door is opened, the state monitoring device 21 may be turned on to introduce the power signal of the power module 10 into the pin 13 of the intermediate relay module 41; or the external monitoring module 50 may output the door magnetic induction signal to the pin 13 of the intermediate relay module 41. In both triggering modes, the pin 13 of the intermediate relay module is equivalent to receiving a high-level signal as an enable signal. At this time, the relay switch in the intermediate relay module 41 is turned on, connecting pin 5 with pin 9, so that the power signal output by the power module 10 can be transmitted to the delay switching module 42 through the intermediate relay module 41.

[0076] Pins 1, 5, 9, 13, and 14 of the delay switching module 42 are the second end, the third end, the first end, the control end, and the ground end, respectively. When the intermediate relay module 41 is turned on, pins 13 and 9 of the delay switching module 42 receive a power signal. A time-delay closer is provided between pins 9 and 5, and a time-delay circuit breaker is provided between pins 9 and 1. When pin 13 receives the power signal as a high-level signal, the delay switching module 42 starts timing, at which time the time-delay closer is in an open state, and the time-delay circuit breaker is in an on state. That is, at this time, the first end of the delay switching module 42 is connected to the second end, and the alarm 31 corresponding to pin 1 is running. After the timing duration of the delay switching module 42 reaches the delay duration, the time-delay circuit breaker is disconnected, and the time-delay closer is turned on. At this time, the delay switching module 42 is switched to be connected to the first end and the third end, and the alarm 31 corresponding to pin 5 is running.

[0077] It should be noted that in the above-mentioned delay switching module 42, before pin 13 receives the power signal, the delay circuit breaker is in the on state, that is, pin 9 and pin 1 remain in the connected state. At this time, if the delay switching module 42 is directly connected to the power module 10, the alarm 31 connected to the second end of the delay switching module 42 will issue an alarm prompt. At this time, the operation of the alarm 31 has nothing to do with whether the door body is open. Therefore, in order to avoid the abnormal start-up of the alarm 31 when the door body is closed, it is necessary to set an intermediate relay module 41 so that when the early warning control module 20 generates a trigger signal, the delay switching module 42 can receive the power signal of the power module 10 through the conductive intermediate relay module 41.

[0078] As an optional implementation, the delay switching module 42 may also be provided with a plurality of output terminals, which are respectively connected to three or more alarms 31, so as to realize different types of alarm prompts in multiple time periods through delay switching control.

[0079] The embodiment of the present application further provides a door access status warning device, which may include the door access status warning circuit provided in the embodiment of the present application.

[0080] The functional blocks shown in the above-described block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present application are programs or code segments that are used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0081] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0082] This article uses specific examples to illustrate the principles and implementation methods of this application. The above examples are only used to help understand the methods and core ideas of this application. The above are only preferred implementation methods of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concepts and technical solutions of this application to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A door access status warning circuit, characterized in that: The access control status early warning circuit comprises: Power module; An early warning control module, comprising a state monitoring device for monitoring the state of the door body, the early warning control module is used to connect to an external monitoring module, and is used to generate a trigger signal according to a state monitoring signal of the state monitoring device, or to generate a trigger signal according to a door magnetic induction signal output by the external monitoring module; An alarm module, including two alarms with different alarm types; A switch module, wherein the control end of the switch module is connected to the early warning control module, and the switch module is connected between the power module and the alarm module; the switch module is used to connect one of the alarms to the power module in response to the trigger signal, and switch to connect the other alarm to the power module after a preset delay.

2. The access control status warning circuit according to claim 1, characterized in that: The switch module comprises: an intermediate relay module, wherein a first end of the intermediate relay module is connected to the power module, a control end of the intermediate relay module is connected to the early warning control module, and the intermediate relay module is used to be turned on in response to the trigger signal; A delay switching module, wherein the first end and the control end of the delay switching module are connected to the second end of the intermediate relay module, and the second end and the third end of the delay switching module are respectively connected to two alarms; the delay switching module is used to connect the first end with the second end in response to the power signal of the power module, and after a preset delay period, switch the connection between the first end and the third end.

3. The access control status warning circuit according to claim 2, characterized in that: The intermediate relay module includes an intermediate relay or at least two intermediate relays connected in series.

4. The access control status warning circuit according to claim 2, characterized in that: The two alarms are any two of a buzzer alarm, an audible and visual alarm, a lighting warning device, a voice warning device or a photographing warning device.

5. The access control status warning circuit according to claim 1, characterized in that: The early warning control module also includes: A reverse power protection unit, wherein two input ends of the reverse power protection unit are respectively connected to the output ends of the state monitoring device and the external monitoring module, and the output end of the reverse power protection unit is connected to the control end of the switch module.

6. The access control status warning circuit according to claim 5, characterized in that: The reverse power protection unit comprises: a first diode, wherein an anode of the first diode is connected to the state monitoring device, and a cathode of the first diode is connected to a control end of the switch module; A second diode, wherein an anode of the second diode is connected to the output end of the external monitoring module, and a cathode of the second diode is connected to the control end of the switch module.

7. The access control status warning circuit according to claim 6, characterized in that: The state monitoring device is connected between the first diode and the power module.

8. The access control status warning circuit according to claim 7, characterized in that: The external monitoring module is a dynamic environment monitoring system, and the DC power supply of the dynamic environment monitoring system is reused as the power supply module.

9. The access control status warning circuit according to claim 7, characterized in that: The state monitoring device is one of a travel switch, a position sensor, a micro switch or a position relay.

10. A door access status warning device, characterized in that: The invention comprises the access control status warning circuit according to any one of claims 1 to 9.

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