Grounding monitoring circuit and grounding monitoring device

Abstract

The utility model provides a grounding monitoring circuit and a grounding monitoring device. The grounding monitoring circuit is connected with target equipment. The grounding monitoring circuit comprises a main control module and a voltage dividing module, the monitoring end of the voltage dividing module is connected with the grounding end of the target equipment, and the output end of the voltage dividing module is connected with the main control module; wherein the voltage dividing module is used for outputting a corresponding monitoring signal to the main control module according to the state of the grounding end of the target equipment; and the main control module is used for determining the grounding end state of the target equipment according to the monitoring signal sent by the voltage dividing module. The grounding condition of the grounding end of the target equipment is monitored by arranging the voltage dividing module, interference of environmental static electricity can be effectively avoided, the accuracy of grounding monitoring is guaranteed, and meanwhile, the voltage dividing module is simple in structure and convenient to maintain in practical application.

Description

Technical Field

[0001] The utility model relates to the field of equipment safety, in particular to a grounding monitoring circuit and a grounding monitoring device. Background Art

[0002] Existing monitoring of the grounding status of ESD (Electro-Static Discharge) equipment is mainly achieved through electrostatic charge sensors. However, electrostatic charge sensors have high requirements for materials and sensitivity, and the maintenance cost in application is high. At the same time, the monitoring effect is easily affected by environmental static interference, resulting in low monitoring accuracy. Utility Model Content

[0003] The main purpose of the utility model is to provide a grounding monitoring circuit and a grounding monitoring device, aiming to solve the problem of low accuracy in monitoring the grounding state in the prior art.

[0004] To achieve the above-mentioned object, the present invention provides a ground monitoring circuit, which is connected to a target device; the ground monitoring circuit includes a main control module and a voltage divider module, wherein the monitoring terminal of the voltage divider module is connected to the ground terminal of the target device, and the output terminal of the voltage divider module is connected to the main control module; wherein:

[0005] The voltage divider module is configured to output a corresponding monitoring signal to the main control module according to the ground terminal status of the target device;

[0006] The main control module is used to determine the ground terminal status of the target device according to the monitoring signal sent by the voltage divider module.

[0007] Optionally, the voltage divider module includes a first resistor and a second resistor, wherein:

[0008] The first end of the first resistor is connected to the ground terminal of the target device, the second end of the first resistor is connected to the power supply through the second resistor, and the second end of the first resistor is also connected to the monitoring terminal of the main control module.

[0009] Optionally, the ground monitoring circuit further includes a main control protection module and a voltage stabilizing module; the main control protection module is connected between the main control module and the voltage dividing module, and the voltage stabilizing module is connected to the output end of the voltage dividing module.

[0010] Optionally, the main control protection module includes a third resistor, a first diode and a second diode; wherein:

[0011] The third resistor is connected between the output end of the voltage divider module and the main control module, the anode of the first diode is connected to the output end of the voltage divider module, the cathode of the first diode is connected to the power supply, the cathode of the second diode is connected to the output end of the voltage divider module, and the anode of the second diode is grounded.

[0012] Optionally, the voltage stabilizing module includes a first capacitor; wherein:

[0013] A first end of the first capacitor is connected to the output end of the voltage divider module, and a second end of the first capacitor is grounded.

[0014] Optionally, the ground monitoring circuit further includes an indication module, which is connected to the output end of the voltage divider module; wherein:

[0015] The indication module is used to perform an indication operation according to the monitoring signal output by the voltage divider module.

[0016] Optionally, the indication module includes a first switch tube, a first light emitting diode, a fourth resistor and a fifth resistor; wherein:

[0017] The control end of the first switching tube is connected to the output end of the voltage divider module through the fourth resistor, the input end of the first switching tube is grounded, the output end of the first switching tube is connected to the cathode of the first light-emitting diode, and the anode of the first light-emitting diode is connected to the power supply through the fifth resistor.

[0018] Optionally, the main control module includes a main control chip, a communication unit and a warning unit; the monitoring end of the main control chip is connected to the output end of the voltage divider module, the communication end of the main control chip is connected to the communication unit, and the output end of the main control chip is connected to the warning unit.

[0019] Optionally, the warning unit includes a second switch tube, a speaker, a sixth resistor, a seventh resistor, and an eighth resistor; wherein:

[0020] The control end of the second switch tube is connected to the output end of the main control chip through the sixth resistor, and the control end of the second switch tube is also grounded through the seventh resistor. The input end of the second switch tube is connected to the power supply through the eighth resistor, the speaker is connected in parallel with the eighth resistor, and the input end of the second switch tube is grounded.

[0021] In addition, to achieve the above-mentioned purpose, the present invention further provides a grounding monitoring device, which includes a housing and the above-mentioned grounding monitoring circuit, wherein the grounding monitoring circuit is disposed in the housing.

[0022] The present invention proposes a ground monitoring circuit and a ground monitoring device, wherein the ground monitoring circuit is connected to a target device; the ground monitoring circuit includes a main control module and a voltage divider module, the monitoring end of the voltage divider module is connected to the ground end of the target device, and the output end of the voltage divider module is connected to the main control module; wherein: the voltage divider module is used to output a corresponding monitoring signal to the main control module according to the ground end status of the target device; the main control module is used to determine the ground end status of the target device according to the monitoring signal sent by the voltage divider module. By setting the voltage divider module to monitor the grounding condition of the ground end of the target device, the interference of environmental static electricity can be effectively avoided, and the accuracy of ground monitoring can be ensured. At the same time, the voltage divider module has a simple structure and is relatively convenient to maintain in actual applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0024] Figure 1 This is a functional module diagram of an embodiment of a ground monitoring circuit of the present utility model;

[0025] Figure 2 The utility model ground monitoring circuit is applied in Figure 1 Circuit structure diagram in the embodiment.

[0026] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings.

[0027] Description of Figure Numbers:

[0028] Label name Label name 100 Main control module R1~R8 The first to eighth resistors 110 Main control chip Q1~Q2 The first and second switching tubes 120 Communication unit D1~D2 First and second diodes 130 Warning unit C1 First capacitor 200 Voltage divider module led First light emitting diode 300 Main control protection module MK1 speaker 400 Voltage regulator module 500 Indicator module DETAILED DESCRIPTION

[0029] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, the descriptions of "first," "second," etc. in this utility model are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0033] This utility model provides a ground monitoring circuit for use in a ground monitoring device. Figure 1 , Figure 1 This is a functional block diagram of an embodiment of a ground monitoring circuit according to the present invention. In this embodiment, the ground monitoring circuit is connected to a target device; the ground monitoring circuit includes a main control module 100 and a voltage divider module 200. The monitoring terminal of the voltage divider module 200 is connected to the ground terminal of the target device, and the output terminal of the voltage divider module 200 is connected to the main control module 100.

[0034] The voltage dividing module 200 is configured to output a corresponding monitoring signal to the main control module 100 according to the ground terminal status of the target device;

[0035] The main control module 100 is configured to determine the ground terminal status of the target device according to the monitoring signal sent by the voltage dividing module 200 .

[0036] The target device is the object of ground monitoring.

[0037] The ground terminal of the target device is grounded under normal circumstances. If the ground terminal of the target device is disconnected from the ground, the grounding of the target device is abnormal.

[0038] The voltage divider module 200 is connected to the ground terminal of the target device. When the ground terminal of the target device is normally grounded, the detection terminal of the voltage divider module 200 is also grounded. At this time, the voltage divider module 200 forms a loop to the ground; when the ground terminal of the target device is abnormally grounded, the detection terminal of the voltage divider module 200 does not form a loop through the ground. Therefore, whether the grounding of the target device is normal will affect the loop status of the voltage divider module 200. Therefore, the voltage divider module 200 can realize the grounding monitoring of the target device.

[0039] The voltage dividing module 200 generates a monitoring signal according to a result of ground monitoring of the target device, and sends the monitoring signal to the main control module 100 .

[0040] After receiving the monitoring signal, the main control determines the grounding status of the target device according to the monitoring signal.

[0041] It is understood that after determining the ground terminal status, relevant operations can be performed based on actual needs, such as uploading the ground terminal status to a host computer, executing instructions based on the ground terminal status, and issuing an alarm when the ground terminal status indicates a grounding anomaly. Specific subsequent operations based on the ground terminal status can be set based on actual needs.

[0042] This embodiment monitors the grounding condition of the ground terminal of the target device by setting a voltage divider module 200, which can effectively avoid interference from environmental static electricity and ensure the accuracy of grounding monitoring. At the same time, the voltage divider module 200 has a simple structure and is relatively easy to maintain in actual applications.

[0043] Furthermore, the voltage dividing module 200 includes a first resistor R1 and a second resistor R2, wherein:

[0044] The first end of the first resistor R1 is connected to the ground terminal of the target device, the second end of the first resistor R1 is connected to the power supply through the second resistor R2, and the second end of the first resistor R1 is also connected to the monitoring terminal of the main control module 100.

[0045] When the ground terminal of the target device is normally grounded, the voltage output by the power supply passes through the first resistor R1 and the second resistor R2 to the ground to form a loop. The voltage output by the power supply is divided by the first resistor R1 and the second resistor R2, and the voltage obtained by the voltage division is output to the monitoring terminal of the main control module 100;

[0046] When the ground terminal of the target device is disconnected from the ground, the branch where the second resistor R2 is located cannot form a loop, and the voltage output by the power supply passes through the first resistor R1 and is output to the monitoring terminal of the main control module 100.

[0047] That is, the voltage signal output from the second end of the first resistor R1 to the monitoring end of the main control module 100 is the monitoring signal; when the grounding end of the target device is normally grounded, the monitoring end of the main control module 100 receives the voltage of the power supply after voltage division, and when the grounding end of the target device is disconnected from the ground, the monitoring end of the main control module 100 receives the voltage of the power supply without voltage division; therefore, there are significant differences in the voltages received by the main control module 100 under different grounding end states of the target device. Therefore, the main control module 100 can accurately determine the grounding end state of the target device based on the voltage received by the monitoring end.

[0048] In actual applications, the voltage value received by the monitoring end of the main control module 100 under different grounding terminal states of the target device can be determined in advance based on experiments and stored. In subsequent applications, the grounding terminal state of the target device is determined based on comparing the stored voltage value with the voltage value actually received by the monitoring end.

[0049] It should be noted that the power supply is a module in the circuit that can provide voltage. It can be a module that originally powers the circuit, or it can be a power supply module specially set up for ground monitoring. The specific value of the voltage output by the power supply can be set based on actual needs, such as 5V.

[0050] It is understandable that the ratio between the first resistor R1 and the second resistor R2 determines the degree of voltage division of the power supply voltage, which can be specifically set based on actual needs.

[0051] In this embodiment, a voltage dividing function is achieved by providing the first resistor R1 and the second resistor R2 . At the same time, different voltage signals can be output to the main control module 100 based on different ground terminal states of the target device.

[0052] Furthermore, the ground monitoring circuit also includes a main control protection module 300 and a voltage stabilizing module 400 ; the main control protection module 300 is connected between the main control module 100 and the voltage dividing module 200 , and the voltage stabilizing module 400 is connected to the output end of the voltage dividing module 200 .

[0053] It can be understood that the monitoring end of the main control module 100 needs to receive the detection signal under different grounding end states of the target device, and the voltage of the power supply under different grounding end states of the target device is output to the main control module 100 after voltage division or without voltage division. The voltage difference between these two cases is large. At the same time, voltage fluctuations may also cause sudden changes in voltage. The voltage of the detection signal output by the voltage divider module 200 may exceed the voltage range that the monitoring end can support. Therefore, in order to prevent the monitoring end of the main control module 100 from being damaged by high voltage, a main control protection module 300 and a voltage stabilizing module 400 are provided in this embodiment; wherein, the main control protection module 300 is used to limit the monitoring end voltage of the main control module 100, and the voltage stabilizing module 400 is used to stabilize the monitoring signal output by the voltage divider module 200 to avoid sudden changes, thereby greatly improving the safety of the main control module 100.

[0054] Furthermore, the main control protection module 300 includes a third resistor R3, a first diode D1 and a second diode D2; wherein:

[0055] The third resistor R3 is connected between the output end of the voltage divider module 200 and the main control module 100, the anode of the first diode D1 is connected to the output end of the voltage divider module 200, the cathode of the first diode D1 is connected to the power supply, the cathode of the second diode D2 is connected to the output end of the voltage divider module 200, and the anode of the second diode D2 is grounded.

[0056] The first diode D1 clamps the positive voltage, keeping the voltage at the monitoring terminal of the main control module 100 lower than the voltage of the power supply, thus protecting the main control module 100 from high voltage. The second diode D2 clamps the negative voltage, keeping the voltage at the monitoring terminal of the main control module 100 higher than the ground voltage. It should be noted that the diode clamping also needs to consider its own voltage drop, and the specific configuration is not detailed here.

[0057] The third resistor R3 is used to reduce the voltage flowing to the monitoring terminal of the main control module 100; the specific structure of the third resistor R3 can be set based on actual needs, such as 1KΩ.

[0058] Furthermore, the voltage stabilizing module 400 includes a first capacitor C1; wherein:

[0059] A first end of the first capacitor C1 is connected to the output end of the voltage divider module 200 , and a second end of the first capacitor C1 is grounded.

[0060] The first capacitor C1 is used to remove high-frequency noise on the signal line and smooth the detection signal output by the voltage divider module 200, thereby improving the stability of the circuit.

[0061] Furthermore, the ground monitoring circuit further includes an indication module 500, which is connected to the output end of the voltage divider module 200; wherein:

[0062] The indication module 500 is configured to perform an indication operation according to the monitoring signal output by the voltage dividing module 200 .

[0063] It is understandable that in order to more intuitively and conveniently understand the ground terminal status of the target device, an indication module 500 is provided in this embodiment, and the indication module 500 performs an indication operation based on the monitoring signal to indicate the ground terminal status of the target device.

[0064] Furthermore, the indication module 500 includes a first switch tube Q1, a first light emitting diode LED, a fourth resistor R4 and a fifth resistor R5; wherein:

[0065] The control end of the first switch tube Q1 is connected to the output end of the voltage divider module 200 through the fourth resistor R4, the input end of the first switch tube Q1 is grounded, the output end of the first switch tube Q1 is connected to the cathode of the first light-emitting diode LED, and the anode of the first light-emitting diode LED is connected to the power supply through the fifth resistor R5.

[0066] When the ground terminal of the target device is properly grounded, the first resistor R1 and the second resistor R2 divide the voltage output by the power supply. At this time, the voltage value output by the output terminal of the voltage divider module 200 is lower than the conduction value of the control terminal of the first switch tube Q1. The first switch tube Q1 is turned off, and the voltage across the first light-emitting diode LED does not meet the conduction condition, so the first light-emitting diode LED does not emit light.

[0067] When the ground terminal of the target device is disconnected from the ground, the voltage output by the power supply is not divided by the second resistor R2, but is directly output through the first resistor R1. At this time, the voltage value output by the output end of the voltage divider module 200 is greater than the conduction value of the control end of the first switch tube Q1, the first switch tube Q1 is turned on, the positive electrode of the first light-emitting diode LED is connected to the power supply through the fifth resistor R5, the negative electrode of the first light-emitting diode LED is grounded through the first switch tube Q1, the voltage across the first light-emitting diode LED meets the conduction condition, and the first light-emitting diode LED emits light.

[0068] The specific type of the first switch tube Q1 can be set based on actual needs; for example, in this embodiment, the first switch tube Q1 is an NPN transistor, the control end of the first switch tube Q1 is the base of the transistor, the input end of the first switch tube Q1 is the collector of the transistor, and the output end of the first switch tube Q1 is the emitter of the transistor.

[0069] It should be noted that the base conduction voltage of the transistor is the voltage value output by the output end of the voltage divider module 200. Therefore, when determining the ratio of the first resistor R1 to the second resistor R2, it is necessary to ensure that when the first resistor R1 and the second resistor R2 divide the voltage output by the power supply, the first switch tube Q1 cannot be turned on, and when the first resistor R1 directly outputs the voltage of the power supply, the first switch tube Q1 can be turned on.

[0070] The fourth resistor R4 is used to reduce the voltage value transmitted to the first switch tube Q1 to prevent the first switch tube Q1 from being damaged by excessive voltage.

[0071] Furthermore, the main control module 100 includes a main control chip 110, a communication unit 120 and a warning unit 130; the monitoring end of the main control chip 110 is connected to the output end of the voltage divider module 200, the communication end of the main control chip 110 is connected to the communication unit 120, and the output end of the main control chip 110 is connected to the warning unit 130.

[0072] The communication unit 120 is used to communicate with external objects; the specific type and structure of the communication unit 120 can be set based on actual needs, such as wired communication or wireless communication such as Lora, WiFi, Bluetooth, etc.

[0073] The warning unit 130 is used to perform a warning operation when a grounding anomaly of the target device is detected; the specific type of warning operation can be set based on actual needs, such as playing alarm audio, video, lighting an alarm, reporting alarm information, etc.

[0074] Furthermore, the warning unit 130 includes a second switch tube Q2, a speaker MK1, a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8; wherein:

[0075] The control end of the second switch tube Q2 is connected to the output end of the main control chip 110 through the sixth resistor R6, and the control end of the second switch tube Q2 is also grounded through the seventh resistor R7. The input end of the second switch tube Q2 is connected to the power supply through the eighth resistor R8. The speaker MK1 is connected in parallel with the eighth resistor R8, and the input end of the second switch tube Q2 is grounded.

[0076] When the ground terminal of the target device is properly grounded, the output terminal of the main control chip 110 outputs a low level, and the second switch tube Q2 is turned off. At this time, the line where the speaker MK1 is located cannot form a loop, and the speaker MK1 does not work;

[0077] When the ground terminal of the target device is disconnected from the ground, the output terminal of the main control chip 110 outputs a high level, and the second switch tube Q2 is turned on. At this time, the power supply voltage is grounded through the speaker MK1 and the second switch tube Q2, and the speaker MK1 works to issue an alarm.

[0078] The specific type of the second switch tube Q2 can be set based on actual needs; for example, in this embodiment, the second switch tube Q2 is an NPN transistor, the control end of the second switch tube Q2 is the base of the transistor, the input end of the second switch tube Q2 is the collector of the transistor, and the output end of the second switch tube Q2 is the emitter of the transistor.

[0079] The following is based on Figure 2 The overall implementation principle of the ground detection circuit of this application is explained:

[0080] For example, the resistance of the first resistor R1 is 1 kΩ, the resistance of the second resistor R2 is 100 Ω, the resistance of the fourth resistor R4 is 1.5 kΩ, and the voltage of the power supply is 5 V.

[0081] When the ground terminal of the target device is properly grounded, the voltage of the power supply reaches the ground through the first resistor R1 and the second resistor R2 to form a first loop. At the same time, the voltage of the power supply reaches the ground through the first resistor R1, the fourth resistor R4, and the first switch tube Q1 to form a second loop. The first loop and the second loop are connected in parallel. Since the resistance of the second loop is much greater than that of the first loop, the equivalent resistance of the parallel circuit should be less than the resistance of the fourth resistor R4 and greater than the resistance of the second resistor R2. The voltage of the power supply is divided by the first resistor R1 and the second resistor R2. The voltage at the second end of the first resistor R1 is (100 / (100+1000))×5=0.4545V. The voltage at the monitoring end of the main control unit is 0.4545V, confirming that the target device is properly grounded. At this time, the second switch tube Q2 is disconnected, and the first light-emitting diode LED does not emit light.

[0082] When the ground terminal of the target device is disconnected from the ground, the first circuit is disconnected from the ground, the resistance is infinite, and the voltage of the power supply passes through the first resistor R1, the fourth resistor R4, and the first switch tube Q1 to the ground to form a second circuit; the voltage at the second end of the first resistor R1 is approximately 3.2V, and the voltage at the monitoring end of the main control unit is 3.2V, determining that the target device is grounded abnormally; at this time, the second switch tube Q2 is turned on, and the first light-emitting diode LED emits light.

[0083] The present invention also provides a ground monitoring device, comprising a housing and a ground monitoring circuit disposed within the housing. The structure of the ground monitoring circuit can be found in the aforementioned embodiments and will not be further described here. As such, since the ground monitoring device of this embodiment utilizes the technical solution of the aforementioned ground monitoring circuit, it possesses all the beneficial effects of the aforementioned ground monitoring circuit.

[0084] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system comprising 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 system. In the absence of further restrictions, an element defined by the sentence "comprises a..." does not exclude the presence of other identical elements in the process, method, article or system comprising the element. The serial numbers of the above-mentioned embodiments of the present invention are for description only and do not represent the advantages and disadvantages of the embodiments.

[0085] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A ground monitoring circuit, characterized in that: The ground monitoring circuit is connected to the target device; the ground monitoring circuit includes a main control module and a voltage divider module, the monitoring end of the voltage divider module is connected to the ground end of the target device, and the output end of the voltage divider module is connected to the main control module; wherein: The voltage divider module is configured to output a corresponding monitoring signal to the main control module according to the ground terminal status of the target device; The main control module is used to determine the ground terminal status of the target device according to the monitoring signal sent by the voltage divider module.

2. The ground monitoring circuit according to claim 1, wherein: The voltage divider module includes a first resistor and a second resistor, wherein: The first end of the first resistor is connected to the ground terminal of the target device, the second end of the first resistor is connected to the power supply through the second resistor, and the second end of the first resistor is also connected to the monitoring terminal of the main control module.

3. The ground monitoring circuit according to claim 1, wherein: The ground monitoring circuit further includes a main control protection module and a voltage stabilizing module; the main control protection module is connected between the main control module and the voltage dividing module, and the voltage stabilizing module is connected to the output end of the voltage dividing module.

4. The ground monitoring circuit according to claim 3, wherein: The main control protection module includes a third resistor, a first diode and a second diode; wherein: The third resistor is connected between the output end of the voltage divider module and the main control module, the anode of the first diode is connected to the output end of the voltage divider module, the cathode of the first diode is connected to the power supply, the cathode of the second diode is connected to the output end of the voltage divider module, and the anode of the second diode is grounded.

5. The ground monitoring circuit according to claim 3, wherein: The voltage stabilizing module includes a first capacitor; wherein: A first end of the first capacitor is connected to the output end of the voltage divider module, and a second end of the first capacitor is grounded.

6. The ground monitoring circuit according to claim 1, wherein: The ground monitoring circuit further includes an indication module, which is connected to the output end of the voltage divider module; wherein: The indication module is used to perform an indication operation according to the monitoring signal output by the voltage divider module.

7. The ground monitoring circuit according to claim 6, wherein: The indication module includes a first switch tube, a first light emitting diode, a fourth resistor and a fifth resistor; wherein: The control end of the first switching tube is connected to the output end of the voltage divider module through the fourth resistor, the input end of the first switching tube is grounded, the output end of the first switching tube is connected to the cathode of the first light-emitting diode, and the anode of the first light-emitting diode is connected to the power supply through the fifth resistor.

8. The ground monitoring circuit according to claim 1, wherein: The main control module includes a main control chip, a communication unit and a warning unit; the monitoring end of the main control chip is connected to the output end of the voltage divider module, the communication end of the main control chip is connected to the communication unit, and the output end of the main control chip is connected to the warning unit.

9. The ground monitoring circuit according to claim 8, wherein: The warning unit includes a second switch tube, a speaker, a sixth resistor, a seventh resistor, and an eighth resistor; wherein: The control end of the second switch tube is connected to the output end of the main control chip through the sixth resistor, and the control end of the second switch tube is also grounded through the seventh resistor. The input end of the second switch tube is connected to the power supply through the eighth resistor, the speaker is connected in parallel with the eighth resistor, and the input end of the second switch tube is grounded.

10. A ground monitoring device, characterized in that: The grounding monitoring device includes a housing and a grounding monitoring circuit according to any one of claims 1 to 9, wherein the grounding monitoring circuit is disposed in the housing.

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