A poor grounding alarm device and a poor grounding alarm system

Abstract

The application discloses a poor grounding alarm device and a poor grounding alarm system. The poor grounding alarm device comprises a detection module and an alarm module. The detection module is configured to detect the voltage of a communication system cabinet to obtain a first voltage signal. The alarm module is configured to generate an alarm signal according to the first voltage signal and output the alarm signal, wherein the alarm signal is used for indicating whether the communication system cabinet is normally grounded or grounded with a fault. The poor grounding alarm system comprises a communication system cabinet, a poor grounding alarm device and an alarm processing platform. The application can realize real-time monitoring of a grounding state, poor grounding alarm, and has a simple scheme and good safety performance.

Description

Technical Field

[0001] This invention relates to, but is not limited to, grounding of communication equipment; more specifically, it relates to a grounding failure alarm device and a grounding failure alarm system. Background Technology

[0002] Grounding wires in communication systems are frequently damaged, causing the systems to lose their lightning protection capabilities. For example, communication base stations, which are radio transceivers, play a crucial role in communication networks. However, many base station systems are damaged by lightning strikes, severely impacting their operational stability. Engineers conducting on-site repairs have discovered that the grounding wires of base station systems are frequently damaged, resulting in the loss of lightning protection. Therefore, there is a need for a grounding failure alarm circuit to detect the system's grounding condition.

[0003] Taking a base station system as an example, one grounding failure detection circuit uses a voltage divider between the L and N lines to ground to detect whether the power supply chassis in the base station system is grounded. This method directly discharges the current in the detection circuit to the base station system chassis, which is very detrimental to personal safety. Furthermore, this detection method can only detect whether there is a connection between the power supply chassis and the base station system chassis. If a successful connection is detected, it is considered that the power supply chassis is grounded, but it cannot determine whether the base station system chassis is grounded. Ultimately, this results in the circuit detecting a normal connection between the power supply chassis and the base station system chassis and reporting a successful grounding of the power supply chassis. However, if the system chassis is not grounded, the power supply chassis remains ungrounded, leading to a false report.

[0004] Another grounding failure detection circuit uses a method where a detection wire is twisted around a grounding wire and grounded simultaneously. When the grounding wire breaks, the corresponding detection wire will also break, and the alarm signal generation circuit will generate a corresponding voltage signal and report it to the base station system. However, this circuit requires an external detection wire between the base station and the ground, the signal is susceptible to interference, and the circuit layout is large and difficult to integrate. Summary of the Invention

[0005] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0006] This invention provides a grounding failure alarm device, including a detection module and an alarm module. The detection module is configured to detect the voltage of the communication system chassis to obtain a first voltage signal. The alarm module is configured to generate and output an alarm signal based on the first voltage signal. The alarm signal indicates whether the communication system chassis is properly grounded or has a grounding fault.

[0007] This invention also provides a grounding failure alarm system, including a communication system chassis, a grounding failure alarm device, and an alarm processing platform, wherein: the grounding failure alarm device is connected to the communication system chassis and is configured to detect the voltage of the communication system chassis, generate an alarm signal based on the detected first voltage signal, and transmit it to the alarm processing platform; the alarm signal is used to indicate whether the communication system chassis is properly grounded or has a grounding fault; the alarm processing platform is configured to receive the alarm signal and perform alarm processing.

[0008] The grounding failure alarm device and grounding failure alarm system of the above embodiments of the present invention can monitor the grounding status in real time and issue grounding failure alarms. The solution is simple and has good safety performance.

[0009] After reading and understanding the accompanying diagrams and detailed descriptions, the other aspects can be understood. Attached Figure Description

[0010] Figure 1 This is a structural block diagram of the grounding failure alarm device according to an embodiment of the present invention;

[0011] Figure 2 yes Figure 1 A schematic diagram of the components of the alarm module;

[0012] Figure 3 This is a structural diagram of a grounding failure alarm device according to an exemplary embodiment of the present invention;

[0013] Figure 4 yes Figure 3 A schematic diagram of the current flow direction within the detection module;

[0014] Figure 5 This is a schematic diagram of the signals VA1 and VA detected by the detection module under different input voltages;

[0015] Figure 6 This is a structural diagram of a grounding failure alarm device according to another exemplary embodiment of the present invention;

[0016] Figure 7 yes Figure 6 The grounding failure alarm device detects the current flow of the module when the voltage input is low.

[0017] Figure 8 yes Figure 6 The grounding failure alarm device detects the current flow of the module when a high voltage is input.

[0018] Figure 9 yes Figure 6 A schematic diagram of signals VA1 and VA detected by the detection module in the poor grounding alarm device shown;

[0019] Figure 10 This is a structural diagram of a grounding failure alarm device according to another exemplary embodiment of the present invention;

[0020] Figure 11 This is a structural block diagram of a grounding failure alarm system according to an exemplary embodiment of the present invention. Detailed Implementation

[0021] This application describes several embodiments, but these descriptions are exemplary and not restrictive, and it will be apparent to those skilled in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with, or may replace, any feature or element of any other embodiment.

[0022] An exemplary embodiment of the present invention provides a grounding failure alarm device 1, such as... Figure 1 As shown, it includes a detection module 10 and an alarm module 11, wherein:

[0023] The detection module 10 is configured to detect the voltage of the communication system casing and obtain a first voltage signal.

[0024] The alarm module 11 is configured to generate and output an alarm signal based on the first voltage signal. The alarm signal is used to indicate whether the communication system chassis grounding is normal or there is a grounding fault.

[0025] The communication system casing is connected to the neutral line of the communication system. Figure 1 In one example, the communication system chassis is a base station system chassis, and the voltage of this base station system chassis is represented by V. PE However, the present invention is not limited to this and can also be other communication system casings. Figure 1 In the accompanying drawings and other figures, the protective ground on the base station system casing is represented as PE.

[0026] In an exemplary embodiment of the present invention, as follows Figure 2 As shown, the alarm module 11 includes:

[0027] Control submodule 20 is used to generate a first level signal based on the first voltage signal, wherein the first level signal generated based on the first voltage signal is different when the communication system chassis grounding is normal or when there is a grounding fault;

[0028] The transmission submodule 30 is used to generate an alarm signal based on the first level signal and transmit the alarm signal to an external alarm processing platform.

[0029] The level signal in this application can be a high-level signal, a low-level signal, a pulse signal, etc. In one example, when the communication system chassis is properly grounded, the first level signal and the alarm signal are pulse signals; when the communication system chassis is grounded, the first level signal and the alarm signal are either high-level signals or low-level signals.

[0030] In an exemplary embodiment of the present invention, the detection module 10 includes a voltage divider circuit, which is configured to divide the voltage of the communication system chassis and output the voltage signal at the intermediate node of the voltage divider circuit as the first voltage signal. The voltage of the communication system chassis refers to the voltage between the protective ground on the communication system chassis and the first functional ground of the grounding failure alarm device.

[0031] exist Figure 3 In one example shown, the detection module 10 includes a voltage divider circuit, which comprises a first voltage divider branch and a second voltage divider branch connected in series. The two ends of the first voltage divider branch are respectively connected to the protective ground PE of the communication system chassis and the intermediate node, node A, of the voltage divider circuit. The two ends of the second voltage divider branch are respectively connected to the intermediate node and the first functional ground GND1. Figure 3 As shown, the first voltage divider branch includes a first resistor R1; the second voltage divider branch includes a second resistor R2 and a first capacitor C1 connected in parallel.

[0032] exist Figure 6 In another example shown, the detection module 10 includes a voltage divider circuit, which, in addition to the first and second voltage divider branches described above, also includes a third voltage divider branch connected in parallel with the second voltage divider branch, such as... Figure 6 As shown, the third voltage divider branch includes a first switching device M1 and a fifth resistor R5 connected in series. The first switching device M1 is configured to receive an external control signal SR1 to control the on / off state of the third voltage divider branch. It is easy to understand that the third voltage divider branch can also be configured to be connected in parallel with the first voltage divider branch, or it can include the first switching device M1 and the fifth resistor R5 connected in series. In this case, by controlling the on / off state of the third voltage divider branch, the ratio of the voltage at the intermediate node to the voltage of the communication system chassis can also be changed; only the on / off state of the controlled third voltage divider branch will differ.

[0033] In an exemplary embodiment of the present invention, the control submodule 20 includes a switching circuit connected between a first node and a first functional ground of the grounding failure alarm device. The switching circuit is configured to control the on / off state of the circuit between the first node and the first functional ground of the grounding failure alarm device based on a first voltage signal, thereby generating the first level signal at the first node. Figure 3In the example shown, the control submodule 20 includes a switching circuit, which includes a second switching device T1. The first terminal of the second switching device T1 is connected to node A, which is the node in the detection module 10 used to output the first voltage signal; the second terminal is connected to the first node, which is node C in the figure; and the third terminal is connected to the first functional ground GND1.

[0034] Figure 3 In the example, the third terminal of the second switching device T1 is connected to the first functional ground GND1 through a diode. When the first voltage signal at node A changes from being greater than the turn-on voltage of the second switching device T1 to being less than the turn-on voltage of the second switching device T1, or from being less than the turn-on voltage of the second switching device T1 to being greater than the turn-on voltage of the second switching device T1, the level value of the first level signal at node C changes accordingly. Therefore, by designing the resistor values ​​in the detection circuit so that the comparison result between the first voltage signal detected by the detection circuit 10 and the turn-on voltage of the second switching device T1 is different when the grounding of the communication system chassis is normal and when the grounding is poor, the level value of the first level signal can reflect the two states of normal and poor grounding of the communication system chassis.

[0035] In an exemplary embodiment of the present invention, the transmission submodule 30 includes an isolation circuit, which is configured to generate a second level signal electrically isolated from the first level signal based on the first level signal, and upload the second level signal as the alarm signal to an external alarm processing platform. Figure 3 In the example shown, the transmission submodule 30 includes an isolation circuit comprising a first signal branch and a second signal branch. The first end of the first signal branch is connected to a first power supply (voltage VCC in the figure), and the second end is connected to a first node, node C, of ​​the control submodule for outputting the first level signal. The first end of the second signal branch is connected to a second power supply (voltage VDD in the figure), which is different from the first power supply, and the second end is connected to a second functional ground GND2 of the grounding fault alarm device, which is different from the first functional ground GND1. Figure 3 In the diagram, the first signal branch includes a third resistor R3 connected in series and an isolation device U1, and the second signal branch includes a fourth resistor R4 connected in series and an isolation device U1. The first and second signal branches are coupled together through the isolation device U1 and are electrically isolated. This isolation device can be an optocoupler. The alarm signal is output from node B between the fourth resistor R4 and the isolation device U1 in the second signal branch.

[0036] An exemplary embodiment of the present invention provides a grounding failure alarm system, including a communication system chassis, a grounding failure alarm device, and an alarm processing platform, wherein: the grounding failure alarm device is connected to the communication system chassis and is configured to detect the voltage of the communication system chassis, generate an alarm signal based on the detected first voltage signal, and transmit it to the alarm processing platform; the alarm signal is used to indicate whether the communication system chassis is grounded normally or has a grounding fault; the alarm processing platform is configured to receive the alarm signal and perform alarm processing.

[0037] The grounding failure alarm device in this embodiment of the grounding failure alarm system can be any of the grounding failure alarm devices described in the above embodiments of the present invention. The communication system chassis can be a base station system chassis, but is not limited thereto.

[0038] When the grounding failure alarm system of this invention has a grounding failure, the grounding failure alarm device detects the voltage of the communication system chassis, generates a corresponding alarm signal, and transmits it to the alarm processing platform. The alarm processing platform then processes the alarm signal transmitted by the alarm device, for example, identifies the alarm signal, and finally transmits it to the user, informing the user that the communication device has a grounding failure and needs to be repaired.

[0039] The grounding failure alarm device of the above embodiments of the present invention uses the detection of the chassis voltage signal to determine whether the base station system has a grounding abnormality, which increases the safety of the detection circuit; it also solves the problem of noise affecting the alarm device, resulting in high reliability. Furthermore, it has a simple structure and is easy to integrate into the base station system. The grounding failure alarm system of the above embodiments of the present invention can be used to monitor the grounding status of the communication system in real time.

[0040] The grounding failure alarm device of the present invention will now be described in conjunction with the accompanying drawings.

[0041] like Figure 3 As shown, an exemplary embodiment of the present invention provides a grounding failure alarm device comprising a detection module 10, a control submodule 20, and a transmission submodule 30. Wherein:

[0042] The first end of the detection module 10 is connected to the protective ground PE on the base station system casing, the second end is connected to the first end of the control submodule forming node A, and the third end is connected to the first functional ground GND1.

[0043] The first end of the control submodule 20 is connected to the second end (node ​​A) of the detection module 10, the second end is connected to the transmission submodule forming node C, and the third end is connected to the first functional ground GND1.

[0044] The first end of the transmission submodule 30 is connected to the second end (node ​​C) of the control submodule, the second end is connected to the output signal line OUT, the third end is connected to the voltage VCC, the fourth end is connected to the voltage VDD, and the fifth end is connected to the second functional ground GND2.

[0045] Figure 3 In the example shown, the detection module 10 includes a first resistor R1, a second resistor R2, and a first capacitor C1. The first terminal of the first resistor R1 is connected to the protective ground PE of the power system chassis, and its second terminal, along with the first terminals of the second resistor R2 and the first capacitor C1, is connected to node A. The second terminal of the second resistor R2 and the second terminal of the first capacitor C1 are connected to the first functional ground GND1.

[0046] The first resistor R1 and the second resistor R2 are used to divide the voltage at the protective ground PE and output a voltage signal from node A. The first capacitor C1 is used to filter the detection module.

[0047] Figure 3 In the example shown, the control submodule 20 includes a first NPN transistor T1 and a first diode D1. The first terminal of the first NPN transistor T1 is connected to node A, the second terminal (i.e., node C) is connected to the first terminal of the transmission submodule 30, and the third terminal is connected to the first terminal of the first diode D1. The second terminal of the first diode D1 is connected to the first functional ground GND1.

[0048] The first NPN transistor T1 is used to control the conduction and disconnection of the T1-D1-GND1 branch. The first diode D1 is optional and is used to increase the conduction voltage value of the base of the first NPN transistor T1.

[0049] Figure 3 In the example shown, the transmission submodule 30 includes a third resistor R3, a fourth resistor R4, and an optocoupler U1. The first terminal of the optocoupler U1 is connected to the second terminal of the third resistor R3, which is connected to node C. The third terminal is connected to the second functional ground GND2. The fourth terminal, along with the second terminal of the fourth resistor R4, is connected to the output node, i.e., node B. The first terminal of the third resistor R3 is connected to voltage VCC. The first terminal of the fourth resistor R4 is connected to voltage VDD.

[0050] The fourth resistor R4 is used to isolate the voltage VB at node B from the voltage VDD, so that VB can obtain a sufficiently low level when the optocoupler is turned on.

[0051] like Figure 4 and Figure 5As shown, when the base station system chassis is properly grounded, since the protective ground PE of the base station system chassis is connected to the N line at the far end, the current flow in the detection module 10 is PE-R1-R2-GND1. The detection module 10 divides the voltage of the base station system chassis. The first voltage signal obtained at node A is a sinusoidal pulse wave signal VA. When the amplitude of VA is higher than the turn-on voltage of the control submodule 20 (such as the threshold voltage of the first NPN transistor T1), the branch VCC-R3-U1-T1-D1-GND1 is turned on, and the voltage VB of the corresponding node B will obtain a low level close to the second functional ground GND2 through the optocoupler U1. When the amplitude of VA is lower than the turn-on voltage of the control submodule 20, the branch VCC-R3-U1-T1-D1-GND1 is turned off, and VB will obtain a high level close to VDD through R4. Then, node B will upload the pulse signal VB to the system's alarm processing platform for processing through the OUT line. When the alarm processing platform receives the pulse signal, it determines that the base station system chassis grounding is normal.

[0052] Please refer to Figure 4 and Figure 5 When the base station system chassis grounding is faulty (i.e., grounding is abnormal), the first terminal of the first resistor R1 is still connected to the protective ground PE, and the current flow in the detection module 10 is still PE--R1--R2--GND1. This is because the electromagnetic compatibility (EMC) devices in the base station power supply will affect the voltage signal on the base station system chassis due to the L-line voltage. Even if the base station system chassis is not grounded, the detection module 10 can still obtain a noise waveform and perform voltage division, and the first voltage signal generated at node A is as follows: Figure 5 As shown in VA1, compared to the first voltage signal VA generated at node A when the chassis grounding is normal, the two signals have the same frequency but different amplitudes when the input voltage of the base station system is the same, and the amplitude of VA is greater than that of VA1. To accurately distinguish between VA1 and VA, the voltage division ratio of the resistors in the detection module 10 can be set so that the turn-on voltage of the control submodule 20 is between the amplitudes of VA1 and VA. Therefore, when the grounding of the base station system chassis is abnormal, the amplitude of the voltage VA1 generated by the noise signal at node A will be lower than the turn-on voltage of the control submodule 20. As a result, the branch VCC-R3-U1-T1-D1-GND1 is disconnected, and VB will obtain a high level close to VDD through R4. Then, node B will send a constant high-level signal to the alarm processing platform. When the alarm processing platform is grounded to this high-level signal, it determines that the base station system chassis grounding is faulty.

[0053] Therefore, the alarm device in this embodiment of the invention can transmit the grounding failure of the base station system chassis to the system processing end in real time, so that the system can make a corresponding response.

[0054] The grounding failure alarm device disclosed in this invention uses the detection of base station system chassis voltage signal to determine whether the base station system chassis is grounded abnormally, increasing the safety of the detection circuit. Even in the presence of noise in the base station system, it can detect grounding failures in the base station system chassis in real time. Furthermore, the device has a simple structure and high integration capability. It is easily understood that the grounding failure alarm device of this invention can also be used for grounding detection and grounding failure alarms of other communication system chassis.

[0055] Figure 3 The grounding failure alarm device in the illustrated embodiment is completed under the same input voltage. However, due to the diversity of application scenarios, sometimes the base station needs to support voltage inputs of different amplitudes. Moreover, the amplitudes of the first voltage signal VA1 detected by the detection module 10 when grounding is poor and the first voltage signal VA detected when grounding is normal are both proportional to the amplitude of the input voltage. Therefore, when the turn-on voltage of the control submodule 20 is constant and the input voltage of the base station system is different, the first voltage signal VA1 when high voltage input and the first voltage signal VA when low voltage input will become difficult to distinguish, causing the alarm device mentioned in Embodiment 1 to be unable to accurately determine whether there is a grounding abnormality in the system.

[0056] Figure 5 The diagram illustrates the first voltage signal VA1 detected by the detection module 10 when grounding is faulty and the first voltage signal VA1 detected when grounding is normal. It can be seen that when the base station system input voltage is 250V and the chassis is not grounded, the peak value of VA1 reaches approximately 1.3V. However, when the base station system input voltage is 90V and the system chassis is properly grounded, the VA obtained by the detection module 10 through voltage division is approximately 1.5V. Therefore, when the turn-on voltage of the control submodule 20 is set to 1.4V, VA1 at an input voltage of 250V is very easily confused with VA at an input voltage of 90V, causing the device to generate false alarms.

[0057] To solve this problem, Figure 6 This illustrates a grounding failure alarm device according to another exemplary embodiment of the present invention, and... Figure 3 The difference in the grounding failure alarm device shown lies in the detection module 10. For example... Figure 6As shown, the detection module 10 includes a first resistor R1, a second resistor R2, a fifth resistor R5, a first NMOS transistor M1, and a first capacitor C1. The first terminal of the first resistor R1 is connected to the protective ground PE of the base station system chassis, and its second terminal, along with the first terminals of the second resistor R2, the fifth resistor R5, and the first capacitor C1, is connected to node A. The second terminal of the second resistor R2 is coupled to the second terminal of the first NMOS transistor. The first terminal of the first NMOS transistor is connected to the control signal SR1, and its third terminal, along with the second terminals of the fifth resistor R5 and the first capacitor C1, is connected to functional ground GND1.

[0058] The first resistor R1 and the second resistor R2 are used to divide the voltage of the protective ground PE. The fifth resistor R5 is connected in parallel with the second resistor R2, which can change the voltage division value VA at node A. The first NMOS transistor M1 is used to control the conduction and disconnection of the R2-M1-GND1 branch. The first capacitor C1 is used to filter the detection module. The devices in the control submodule 20 and the transmission submodule 30 in this embodiment, as well as the connection relationships between the devices, are the same as in Embodiment 1, and will not be repeated.

[0059] use Figure 6 The grounding alarm system of the grounding alarm device shown is as follows: Figure 11 As shown, the system includes a base station system chassis, a grounding failure alarm device, and a base station alarm processing platform. The grounding failure alarm device is connected to the communication system chassis and is configured to detect the voltage V of the communication system chassis. PE An alarm signal V is generated based on the detected first voltage signal. B And transmit it to the base station alarm processing platform; alarm signal V B The alarm signal is used to indicate whether the communication system chassis grounding is normal or faulty; the alarm processing platform receives the alarm signal and performs alarm processing. In addition, the alarm processing platform also sends a control signal SR1 to the grounding failure alarm device to control the switching on and off of the first NMOS transistor M1.

[0060] In an exemplary embodiment of the present invention, the alarm processing platform is configured to: when the input voltage of the communication system is higher than a set threshold, send a first control signal to the control terminal of the first switching device, causing the first switching device to be in a first state, at which time the ratio of the voltage of the intermediate node to the voltage of the communication system chassis (i.e., the voltage division ratio) is a first ratio; and when the input voltage of the communication system is lower than the set threshold, send a second control signal to the control terminal of the first switching device, causing the first switching device to be in a second state, at which time the ratio of the voltage of the intermediate node to the voltage of the communication system chassis is a second ratio; wherein, the first state is one of conduction and disconnection, the second state is the other of conduction and disconnection, and the first ratio is less than the second ratio. Therefore, when the input voltage of the communication system is higher than the set threshold, the voltage division ratio is small, and when the input voltage of the communication system is lower than the set threshold, the voltage division ratio is large, making the difference between the amplitude of the first voltage signal (VA1) at the intermediate node when there is a high voltage input and poor grounding and the amplitude of the first voltage signal (VA) at the intermediate node when there is a low voltage input and normal grounding larger, thereby avoiding the aforementioned false alarms.

[0061] In one example, based on the required range of the base station system input voltage, the base station alarm processing platform will preset a reference voltage VREF. When the input voltage of the base station system is higher than the preset value VREF, the base station alarm processing platform will generate a control signal SR1, causing M1 to close. This connects branch R5-M1-GND1, reducing the voltage division ratio of the voltage divider resistors within the detection module. Consequently, the amplitude of the first voltage signal VA generated at the intermediate node when the system chassis grounding is normal is reduced, and the amplitude of the first voltage signal VA1 generated at the intermediate node when the system chassis grounding is poor is also lowered. When the input voltage of the base station system is lower than the preset value VREF, the base station alarm processing platform will disconnect M1 via the control signal SR1. Therefore, when the input voltage is low, the preset voltage division ratio of the detection module 10 remains unchanged. Thus, the difference in amplitude between the first voltage signal VA detected when the input voltage is low and the system chassis grounding is normal, and the first voltage signal VA1 detected by the detection module 10 when the input voltage is high and the system chassis grounding is poor, increases (relative to the constant voltage division ratio). Figure 3 (As shown in the example), they are easily distinguishable, thus preventing false alarms caused by their similar amplitudes. The branch consisting of R2 and M1 can also be connected in parallel with R1, which can also change the voltage division ratio. However, the above control logic needs to be changed to control M1 to open when the base station input voltage is higher than the preset value VREF, and control M1 to close when the base station input voltage is lower than the preset value VREF.

[0062] based on Figure 6 Grounding alarm device and Figure 11The alarm processing platform, when the base station system input voltage is lower than the preset voltage value VREF in the base station alarm processing platform:

[0063] Please refer to Figure 7 and Figure 9 When the base station system chassis grounding is normal, since PE is connected to the N line at the remote end, and the base station processing platform turns off the first NMOS transistor M1 through SR1, the current flow in the detection module 10 is chassis ground PE-R1-R2-GND1. The first voltage signal obtained at node A is a sinusoidal pulse signal VA. When the amplitude of VA is higher than the turn-on voltage of the control submodule 20, the branch VCC-R3-U1-T1-D1-GND1 is turned on, and the corresponding node B will obtain a low-level signal VB close to GND2 through optocoupler U1. When the amplitude of VA is lower than the turn-on voltage of the control submodule 20, the branch VCC-R3-U1-T1-D1-GND1 is turned off, and node B will obtain a high-level signal VB close to VDD through R4. Then node B uploads the pulse signal VB to the alarm processing platform through the OUT line. When the alarm processing platform receives VB as a pulse signal, it determines that the base station system chassis grounding is normal.

[0064] Please refer to Figure 7 and Figure 9 When the base station system chassis grounding is faulty, the first terminal of the first resistor R1 remains connected to the system chassis, and the base station alarm processing platform turns off the first NMOS transistor M1 via SR1. Since there is still a noise signal of the same frequency on the system chassis, the current flow within the detection module 10 remains chassis ground PE--R1--R2--GND1. Through the proportional setting within the detection module 10, the amplitude of the first voltage signal VA1 generated at node A after voltage division of the noise signal is lower than the turn-on voltage of the control submodule 20. Therefore, the branch VCC-R3-U1-T1-D1-GND1 is disconnected, and node B obtains a high-level signal VB close to VDD through R4. Then, node B sends a constant high-level signal VB to the alarm processing platform. When the alarm processing platform receives a high-level signal VB, it determines that the base station system chassis grounding is faulty. It is easy to understand that by using different switching devices or different circuits (such as adding an inverter), it is also possible to make VB a low-level signal when the base station system chassis grounding is faulty.

[0065] based on Figure 6 Grounding alarm device and Figure 11 The alarm processing platform, when the base station system input voltage is higher than the preset voltage value VREF in the base station alarm processing platform:

[0066] Please refer to Figure 8 and Figure 9When the base station system chassis grounding is normal, since PE is connected to the N line at the remote end, and the base station alarm processing platform turns on the first NMOS transistor M1 through SR1, the current flow in the detection module 10 is chassis ground PE-R1-R2--GND1 and PE-R1-R5-M1-GND1. The first voltage signal obtained at node A is a sinusoidal pulse wave signal VA. Due to the conduction of branch R5-M1-GND1, the voltage division ratio in the detection module 10 is reduced compared to the low voltage input, and the amplitude of VA is also reduced accordingly. When the amplitude of VA is higher than the turn-on voltage of the control submodule 20, branch VCC-R3-U1-T1-D1-GND1 will still be turned on, and node B will obtain a low-level signal VB close to GND2 through optocoupler U1. When the amplitude of VA is lower than the turn-on voltage of control submodule 20, branch VCC-R3-U1-T1-D1-GND1 is disconnected, and node B will receive a high-level signal VB close to VDD through R4. Node B then uploads this pulse signal VB to the alarm processing platform for processing via the OUT line. When the alarm processing platform receives a pulse signal VB, it determines that the base station system chassis grounding is normal.

[0067] Please refer to Figure 8 and Figure 9 When the base station system chassis grounding is faulty, the first end of the first resistor R1 remains connected to the system chassis, and the base station alarm processing platform turns on the first NMOS transistor M1 via SR1. Since there is still a noise signal of the same frequency on the system chassis, the current flow within the detection module 10 remains PE--R1--R2--GND1 and PE-R1-R5-M1-GND1. Furthermore, due to the conduction of branch R5-M1-GND1, the amplitude of the first voltage signal VA1 obtained at the node by voltage division of the noise signal is reduced, effectively preventing detection interference caused by low voltage input. Moreover, since the amplitude of VA1 generated by voltage division of the noise signal is lower than the turn-on voltage of the control submodule 20, branch VCC-R3-U1-T1-D1-GND1 is disconnected, and node B obtains a high-level signal VB close to VDD. Afterwards, node B transmits a constant high-level signal VB to the alarm processing platform via the OUT line. When the alarm processing platform receives a high-level VB signal, it indicates that the base station system chassis grounding is faulty.

[0068] Therefore, when the base station system input voltage is higher than the preset voltage value VREF in the base station alarm processing platform, the alarm device proposed in this embodiment of the invention can transmit the grounding failure of the base station chassis to the system processing end in real time, and the alarm processing platform will make a corresponding response.

[0069] Figure 9The diagram illustrates the first voltage signal VA detected by the detection module under different input voltages after adding branch R5-M1-GND1, when the grounding is normal and when the grounding is poor. It can be seen that at a 250V input, the amplitude of the first voltage signal VA1 under poor grounding is significantly smaller, only about 0.9V, while at a 90V input voltage, the first voltage signal under normal grounding is still 1.5V. That is, the difference between the first voltage signal VA1 detected under high voltage input and poor grounding and the first voltage signal VA detected under low voltage input and normal grounding increases, effectively solving the problem of VA1 and VA being indistinguishable under different input voltages when the turn-on voltage of the control submodule 20 is constant, leading to false alarms.

[0070] In summary, the amplitude of the noise signal on the system chassis increases with the increase of the input voltage. Therefore, when there is a high voltage input and poor grounding, the amplitude of the first voltage signal VA1 generated by the voltage division of the noise signal is relatively high. When the conduction voltage of the control submodule 20 (i.e., the turn-on voltage mentioned above) is constant, it is very easy to be confused with the first voltage signal VA generated when there is a low voltage input and normal grounding, which leads to false detection by the alarm device. However, the setting of branch R5-M1-GND1 in this embodiment of the invention reduces the VA1 generated by the voltage division of the noise signal when there is a high voltage input and poor grounding, effectively preventing the problem of false alarm caused by the inability to distinguish VA1 from the first voltage signal VA generated when there is a low voltage input and normal grounding.

[0071] The grounding failure alarm device and grounding failure alarm system proposed in this invention use the detection of the base station system chassis voltage signal to determine whether the base station system is grounded abnormally, which increases the safety of the detection circuit; it solves the problem of noise affecting the alarm device, and can detect the grounding failure status of the equipment under different input voltages, with high reliability and simple structure.

[0072] The structure of the grounding failure alarm device in this exemplary embodiment is as follows: Figure 10 As shown, its structure is similar to Figure 6 The embodiments shown are basically the same, with the following differences:

[0073] The detection module 10 in this embodiment includes a first resistor R1, a second resistor R2, a fifth resistor R5, a sixth resistor R6, a second NPN transistor T2, and a first capacitor C1. The first terminal of the first resistor R1 is connected to the power system chassis ground PE, and its second terminal, along with the first terminals of the second resistor R2, the fifth resistor R5, and the first capacitor C1, is connected to node A. The second terminal of the fifth resistor R5 is connected to the second terminal of the second NPN transistor T2. The first terminal of the second NPN transistor T2 and the first terminal of the sixth resistor R6 are connected to the control signal SR1, and its third terminal, along with the second terminals of the second resistor R2, the first capacitor C1, and the sixth resistor R6, is connected to the first functional ground GND1.

[0074] The first resistor R1 and the second resistor R2 are used to convert the voltage V PE A voltage divider is used. The fifth resistor R5 is connected in parallel with the second resistor R2 to change the voltage division value VA obtained at node A. The second NPN transistor T2 and the sixth resistor R6 are used to control the conduction and disconnection of the R5-T2-GND1 branch. The first capacitor C1 is used for filtering the detection module. Figure 6 Compared to the illustrated embodiment, this embodiment uses a switching device consisting of a second NPN transistor T2 and a sixth resistor R6 instead of... Figure 6 The switching device in the circuit is the first NMOS transistor M1.

[0075] In this embodiment, the devices within the control submodule 20 and the transmission submodule 30, as well as the connection relationships between these devices, are... Figure 6 The embodiments shown are the same, and will not be repeated here.

[0076] When a high voltage is input, the base station alarm processing platform turns on T2 via SR1; when a low voltage is input, the base station alarm processing platform turns off T2 via SR1. Otherwise, the operation process of this embodiment can be compared with... Figure 6 The embodiments shown are the same, and will not be repeated here.

[0077] It should be noted that, Figure 6 The NMOS transistor in the detection module 10 and Figure 10 The NPN transistors mentioned can be modified by those skilled in the art into other switching device circuits such as PMOS transistors and PNP transistors to control the voltage division ratio of the detection module. However, these modifications will be within the protection scope of this invention without departing from the spirit of this invention.

[0078] It should be noted that the first diode D1 in the control submodule 20 can also be placed at the base of the first NPN transistor T1, that is, the first end of diode D1 is connected to the detection module 10, and the second end is connected to the base of the first NPN transistor T1. If the conduction voltage of the control submodule 20 needs to be changed, the number of diodes connected in series with the base or emitter of the first NPN transistor T1 can be adjusted as needed. However, these variations are all within the protection scope of this invention without departing from the spirit of this invention.

[0079] It should be noted that the isolation device in the transmission module 30 can be an isolation transformer, isolation chip, etc., in addition to optocouplers. However, these variations will be within the scope of protection of this invention without departing from the spirit of the invention.

[0080] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Although the embodiments disclosed in this disclosure are as described above, the content is merely an implementation method adopted to facilitate understanding of this disclosure and is not intended to limit this disclosure. Any person skilled in the art to which this disclosure pertains may make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in this disclosure; however, the patent protection scope of this disclosure shall still be determined by the scope defined in the appended claims.

Claims

1. A grounding failure alarm device, characterized in that, It includes a detection module and an alarm module, wherein: The detection module is configured to detect the voltage of the communication system casing and obtain a first voltage signal; The alarm module is configured to generate and output an alarm signal based on the first voltage signal, wherein the alarm signal is used to indicate whether the communication system chassis grounding is normal or there is a grounding fault. The alarm module includes: The control submodule is configured to generate a first level signal based on the first voltage signal, wherein the first level signal generated based on the first voltage signal is different when the communication system chassis grounding is normal or when there is a grounding fault. The transmission submodule is configured to generate the alarm signal based on the first level signal and transmit the alarm signal to an external alarm processing platform; The detection module includes a voltage divider circuit, which is configured to divide the voltage of the communication system chassis and output the voltage signal at the intermediate node of the voltage divider circuit as the first voltage signal. The voltage of the communication system chassis refers to the voltage between the protective ground on the communication system chassis and the first functional ground of the grounding failure alarm device.

2. The grounding failure alarm device as described in claim 1, characterized in that: When the communication system chassis is properly grounded, the first level signal and the alarm signal are pulse signals; when the communication system chassis is grounded, the first level signal and the alarm signal are high-level signals or low-level signals.

3. The grounding failure alarm device as described in claim 1, characterized in that: The voltage divider circuit includes a first voltage divider branch and a second voltage divider branch connected in series. The two ends of the first voltage divider branch are respectively connected to the protective ground and the intermediate node, and the two ends of the second voltage divider branch are respectively connected to the intermediate node and the first functional ground. The first voltage divider branch includes a first resistor; The second voltage divider branch includes a second resistor, or includes a second resistor and a first capacitor connected in parallel.

4. The grounding failure alarm device as described in claim 3, characterized in that: The voltage divider circuit further includes a third voltage divider branch connected in parallel with the first voltage divider branch or the second voltage divider branch, the third voltage divider branch including a first switching device and a fifth resistor connected in series; The first switching device is configured to receive external control signals to control the on / off state of the third voltage divider branch.

5. The grounding failure alarm device as described in any one of claims 1 to 4, characterized in that: The control submodule includes a switching circuit connected between the first node and the first functional ground of the grounding failure alarm device. The switching circuit is configured to control the circuit connection and disconnection between the first node and the first functional ground of the grounding failure alarm device according to the first voltage signal, so as to generate the first level signal at the first node.

6. The grounding failure alarm device as described in claim 5, characterized in that: The switching circuit includes a second switching device. The first end of the second switching device is connected to the intermediate node of the detection module, the second end is connected to the first node, and the third end is connected to the first functional ground. When the first voltage signal changes from being greater than the turn-on voltage of the second switching device to being less than the turn-on voltage, or from being less than the turn-on voltage to being greater than the turn-on voltage, the level value of the first level signal changes accordingly.

7. The grounding failure alarm device as described in any one of claims 1 to 4, characterized in that: The transmission submodule includes an isolation circuit, which is configured to generate a second level signal that is electrically isolated from the first level signal based on the first level signal, and upload the second level signal as the alarm signal to an external alarm processing platform.

8. The grounding failure alarm device as described in claim 7, characterized in that: The isolation circuit includes a first signal branch and a second signal branch. The first end of the first signal branch is connected to a first power supply, and the second end is connected to a first node of the control submodule for outputting the first level signal. The first end of the second signal branch is connected to a second power supply different from the first power supply, and the second end is connected to a second functional ground of the grounding failure alarm device, which is different from the first functional ground. The first signal branch includes a third resistor and an isolation device connected in series, and the second signal branch includes a fourth resistor and the isolation device connected in series. The first signal branch and the second signal branch are coupled together through the isolation device and electrically isolated. The alarm signal is output from the node between the fourth resistor and the isolation device.

9. A grounding failure alarm system, characterized in that, This includes the communication system chassis, grounding fault alarm device, and alarm processing platform, among which: The grounding failure alarm device is connected to the communication system chassis and is configured to detect the voltage of the communication system chassis, generate an alarm signal based on the detected first voltage signal, and transmit it to the alarm processing platform. The alarm signal is used to indicate whether the communication system chassis is grounded normally or has a grounding fault. Generating an alarm signal based on the detected first voltage signal and transmitting it to the alarm processing platform includes: generating a first level signal based on the first voltage signal, wherein the first level signal generated based on the first voltage signal is different when the communication system chassis is grounded normally or has a grounding fault; generating the alarm signal based on the first level signal and transmitting the alarm signal to an external alarm processing platform. The grounding failure alarm device includes a voltage divider circuit, which is configured to divide the voltage of the communication system chassis, and output the voltage signal at the intermediate node of the voltage divider circuit as the first voltage signal. The voltage of the communication system chassis refers to the voltage between the protective ground on the communication system chassis and the first functional ground of the grounding failure alarm device. The alarm processing platform is configured to receive the alarm signal and perform alarm processing.

10. The grounding failure alarm system as described in claim 9, characterized in that: The grounding failure alarm device is the grounding failure alarm device as described in any one of claims 1 to 8.

11. The grounding failure alarm system as described in claim 9, characterized in that: The grounding failure alarm device is the grounding failure alarm device as described in claim 4; The alarm processing platform is also configured as follows: When the input voltage of the communication system is higher than a set threshold, a first control signal is sent to the control terminal of the first switching device to put the first switching device in a first state. At this time, the ratio of the voltage of the intermediate node to the voltage of the communication system chassis is a first ratio. When the input voltage of the communication system is lower than the set threshold, a second control signal is sent to the control terminal of the first switching device to put the first switching device in a second state. At this time, the ratio of the voltage of the intermediate node to the voltage of the communication system chassis is a second ratio. The first state is either on or off, the second state is either on or off, and the first ratio is less than the second ratio.

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