WO2021027832A1

WO2021027832A1 - Alarm apparatus and system for poor grounding

Info

Publication number: WO2021027832A1
Application number: PCT/CN2020/108620
Authority: WO
Inventors: 王奥运; 马金波; 王德举; 肖开祥; 左志岭
Original assignee: 中兴通讯股份有限公司
Priority date: 2019-08-12
Filing date: 2020-08-12
Publication date: 2021-02-18
Also published as: CN112394295A

Abstract

Provided are an alarm apparatus and system for poor grounding. The alarm apparatus for poor grounding comprises a measurement module and an alarm module; the measurement module is configured to measure the voltage of a communication system housing so as 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 that the communication system housing is normally grounded or has a grounding fault. The alarm system for poor grounding comprises the communication system housing, the alarm apparatus for poor grounding, and an alarm processing platform.

Description

Bad grounding warning device and bad grounding warning system

Technical field

The present disclosure relates to but is not limited to the field of communication equipment.

Background technique

The ground wire of the communication system is often damaged, causing the communication system to lose its lightning protection function. For example, a communication base station is a radio transceiver station, which plays a vital role in a communication network. However, many communication base station systems are damaged by lightning, which seriously affects the stability of base station operation. Engineers went to the site for maintenance and found that the ground wire of the base station system was often damaged, causing the base station system to lose its lightning protection function. Therefore, it is hoped that there can be a poor grounding alarm circuit to detect the grounding of the system.

Taking the base station system as an example, a poor grounding detection circuit uses L and N lines to divide the voltage to detect whether the power cabinet in the base station system is grounded. This method will directly discharge the current in the detection circuit to the base station The system casing is very unfavorable to personal safety. In addition, this detection method can only detect whether the power supply case and the base station system case are connected. As long as the connection between the power supply case and the base station system case is detected, it is considered that the power supply case is grounded, but the base station cannot be determined. Whether the system chassis is grounded, the final result is that this circuit detects the normal connection between the power supply chassis and the base station system chassis, and will report that the power supply chassis is grounded successfully, but in fact, if the system chassis is not grounded, The power supply chassis is still in an ungrounded state, resulting in a false report.

Another poor grounding detection circuit uses a method of winding a detection wire with the grounding wire and grounding at the same time. When the grounding wire is disconnected, the corresponding detection wire will also be disconnected, and the alarm signal generating circuit generates a corresponding voltage signal , And report to the base station system. However, this circuit must add a detection line between the base station and the ground, and the signal is susceptible to interference. In addition, the circuit has a large layout area and is difficult to integrate.

Summary of the invention

The following is an overview of the topics detailed in this article. This summary is not intended to limit the scope of protection of the claims.

The embodiment of the present disclosure provides a poor grounding alarm device, which includes 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 The first voltage signal generates and outputs an alarm signal, and the alarm signal is used to indicate that the communication system chassis is grounded normally or has a ground fault.

The embodiment of the present disclosure also provides a poor grounding alarm system, including a communication system casing, a poor grounding alarm device, and an alarm processing platform. The poor grounding alarm device is connected to the communication system casing and is configured to detect the The voltage of the communication system chassis generates an alarm signal according to the detected first voltage signal and transmits it to the alarm processing platform, the alarm signal is used to indicate that the communication system chassis is grounded normally or has a ground fault;

The alarm processing platform is configured to receive the alarm signal and perform alarm processing.

Description of the drawings

Fig. 1 is a structural block diagram of a poor grounding warning device according to an embodiment of the present disclosure;

Figure 2 is a schematic diagram of the composition of the alarm module in Figure 1;

Fig. 3 is a structural diagram of a poor grounding warning device according to an exemplary embodiment of the present disclosure;

FIG. 4 is a schematic diagram of the current flow in the detection module in FIG. 3;

5 is a schematic diagram of the signal VA1 and the signal VA detected by the detection module under different input voltages;

Fig. 6 is a structural diagram of a poor grounding warning device according to another exemplary embodiment of the present disclosure;

Fig. 7 is a current flow diagram of the detection module of the poor grounding alarm device of Fig. 6 when a low voltage is input;

Fig. 8 is a current flow diagram of the detection module of the poor grounding alarm device of Fig. 6 when a high voltage is input;

9 is a schematic diagram of the signal VA1 and the signal VA detected by the detection module in the poor grounding alarm device of FIG. 6;

FIG. 10 is a structural diagram of a poor grounding warning device according to another exemplary embodiment of the present disclosure; and

Fig. 11 is a structural block diagram of a poor grounding warning system according to an exemplary embodiment of the present disclosure.

detailed description

The present disclosure describes a number of embodiments, but the description is exemplary rather than restrictive, and it is obvious to a person of ordinary skill in the art that the embodiments described in the present disclosure may There are more examples and implementation schemes. Although many possible feature combinations are shown in the drawings and discussed in the specific embodiments, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment can be used in combination with, or substituted for, any other feature or element in any other embodiment.

The poor grounding alarm device and the poor grounding alarm system according to the embodiments of the present disclosure can monitor the grounding state in real time and perform the poor grounding alarm, and the solution is simple and the safety performance is good.

After reading and understanding the drawings and detailed description, other aspects can be understood.

An exemplary embodiment of the present disclosure provides a poor grounding alarm device 1, as shown in FIG. 1, including a detection module 10 and an alarm module 11.

The detection module 10 is configured to detect the voltage of the chassis of the communication system to obtain a first voltage signal.

The alarm module 11 is configured to generate and output an alarm signal according to the first voltage signal. The alarm signal is used to indicate that the communication system chassis is grounded normally or has a ground fault.

The communication system chassis is connected with the neutral line of the communication system. In the example of FIG. 1, the communication system enclosure is a base station system enclosure, and the voltage of the base station system enclosure is denoted as V _PE , but the present disclosure is not limited to this, and may also be other communication system enclosures. In Figure 1 and other drawings, the protective ground on the chassis of the base station system is denoted as PE.

In an exemplary embodiment according to the present disclosure, as shown in FIG. 2, the alarm module 11 includes: a control sub-module 20 for generating a first level signal according to the first voltage signal, and the communication system chassis is grounded normally or has a ground fault The first level signal generated according to the first voltage signal is different; and the transmission sub-module 30 is configured to generate an alarm signal according to the first level signal and transmit the alarm signal to an external alarm processing platform.

The level signal in the present disclosure may be a high level signal, a low level signal, a pulse signal, and so on. In an example, when the communication system chassis is grounded normally, the first level signal and the alarm signal are pulse signals; when the communication system chassis is grounded, the first level signal and the The alarm signal is a high-level signal or a low-level signal.

In an exemplary embodiment according to the present disclosure, the detection module 10 includes a voltage divider circuit configured to divide the voltage of the communication system chassis, and the voltage signal at the intermediate node of the voltage divider circuit is used as the first voltage For signal output, the voltage of the communication system chassis refers to the voltage between the protective ground PE on the communication system chassis and the first functional ground GND1 of the poor grounding alarm device.

In the example shown in FIG. 3, the detection module 10 includes a voltage dividing circuit including a first voltage dividing branch and a second voltage dividing branch connected in series, and both ends of the first voltage dividing branch They are respectively connected to the protective ground PE of the communication system chassis and the intermediate node (ie node A) of the voltage divider circuit, and both ends of the second voltage divider branch are respectively connected to the intermediate node and the first functional ground GND1. As shown in FIG. 3, the first voltage dividing branch includes a first resistor R1, and the second voltage dividing branch includes a second resistor R2 and a first capacitor C1 connected in parallel.

In another example shown in FIG. 6, the detection module 10 includes a voltage divider circuit. In addition to the above-mentioned first voltage divider branch and the second voltage divider branch, the voltage divider circuit also includes a parallel connection with the second voltage divider branch. The third divider branch. As shown in FIG. 6, the third voltage dividing 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 and off of the third voltage dividing branch. It is easy to understand that the third voltage divider branch can also be set in parallel with the first voltage divider branch, and can include a first switching device M1 and a fifth resistor R5 connected in series. It can also achieve the effect of changing the ratio of the voltage of the intermediate node A to the voltage of the communication system chassis, as long as the on-off state of the controlled third voltage divider branch is different.

In an exemplary embodiment according to the present disclosure, the control submodule 20 includes a switch circuit connected between the first node and the first functional ground GND1 of the poor grounding alarm device, and the switch circuit is configured to The circuit between the first node and the first functional ground GND1 of the poor grounding warning device is controlled to be turned on and off according to the first voltage signal to generate a first level signal at the first node C. In the example shown in FIG. 3, the control sub-module 20 includes a switching circuit including a second switching device T1, and a first end of the second switching device T1 is connected to a node of the detection module 10 for outputting a first voltage signal. (Ie node A), the second end is connected to the first node (ie node C in the figure), and the third end is connected to the first functional ground GND1.

In the example of FIG. 3, the third terminal of the second switching device T1 is connected to the first functional ground GND1 through a diode D1. When the first voltage signal at node A changes from greater than the turn-on voltage of the second switching device T1 to less than the turn-on voltage of the second switching device T1, or from less than the turn-on voltage of the second switching device T1 to greater than the second switching device T1 When the voltage is turned on, the level value of the first level signal at node C changes accordingly. Therefore, it is only necessary to design the resistance value in the detection circuit to make the comparison result of the first voltage signal detected by the detection circuit 10 and the turn-on voltage of the second switching device T1 when the grounding of the communication system chassis is normal or poor. Different, the level value of the first level signal can reflect the two states of normal grounding and poor grounding of the chassis of the communication system.

According to an exemplary embodiment of the present disclosure, the transfer sub-module 30 includes an isolation circuit configured to generate a second level signal electrically isolated from the first level signal according to the first level signal, and connect the second level signal to the The level signal is uploaded to the external alarm processing platform as an alarm signal. In the example shown in FIG. 3, the transmission sub-module 30 includes an isolation circuit including a first signal branch and a second signal branch, and the first end of the first signal branch is connected to the first power supply (in the figure) The second terminal is connected to the first node (ie node C) for outputting the first level signal; the first terminal of the second signal branch is connected to a second power supply that is different from the first power supply. The power supply (voltage VDD in the figure), the second end is connected to the second functional ground GND2 of the poor grounding alarm device, and the second functional ground GND2 is different from the first functional ground GND1. In Figure 3, the first signal branch includes a third resistor R3 and an isolation device U1 connected in series, the second signal branch includes a fourth resistor R4 and an isolation device U1 connected in series, the first signal branch and the second signal branch Coupled and electrically isolated through the isolation device U1. The isolation device U1 may be an optocoupler device, and the alarm signal is output from the node B between the fourth resistor R4 of the second signal branch and the isolation device U1.

An exemplary embodiment of the present disclosure provides a poor grounding warning system, including a communication system chassis, a poor grounding warning device, and an alarm processing platform. The poor grounding alarm device is connected to the communication system chassis and is set to detect the voltage of the communication system chassis, and generate an alarm signal according to the detected first voltage signal and transmit it to the alarm processing platform. The alarm signal is used to indicate that the communication system chassis is properly grounded Or ground fault. The alarm processing platform is set to receive alarm signals and perform alarm processing.

The poor grounding alarm device in the poor grounding alarm system according to the embodiment of the present disclosure may adopt any poor grounding alarm device according to the embodiment of the present disclosure. The communication system chassis may be a base station system chassis but is not limited thereto.

According to the poor grounding alarm system of the embodiment of the present disclosure, when the communication system chassis is poorly grounded, the poor grounding alarm device generates a corresponding alarm signal by detecting the voltage of the communication system chassis and transmits it to the alarm processing platform, and then the alarm processing platform The alarm signal transmitted by the alarm device is processed, for example, the alarm signal is identified and finally transmitted to the user, and the user is notified that the communication equipment has poor grounding and needs maintenance.

According to the poor grounding alarm device of the embodiment of the present disclosure, the method of detecting the chassis voltage signal is used to determine whether the base station system is abnormally grounded, which increases the safety of the detection circuit, solves the effect of noise on the alarm device, and has high reliability. And the structure is simple, easy to integrate in the base station system. The poor grounding warning system of the above embodiment of the present disclosure can be used to monitor the grounding condition of the communication system in real time.

The poor grounding warning device according to the embodiment of the present disclosure will be described below with reference to the accompanying drawings.

As shown in FIG. 3, the poor grounding alarm device according to an exemplary embodiment of the present disclosure includes a detection module 10, a control sub-module 20 and a transmission sub-module 30.

The first end of the detection module 10 is connected to the protective ground PE on the chassis of the base station system, the second end is connected to the first end (node A) of the control submodule, and the third end is connected to the first functional ground GND1.

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 first end (node C) of the transfer submodule, and the third end is connected to the first functional ground GND1.

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 voltage VCC. The terminal is connected to the second functional ground GND2.

In the example shown in FIG. 3, the detection module 10 includes a first resistor R1, a second resistor R2, and a first capacitor C1. The first end of the first resistor R1 is connected to the protective ground PE of the power system chassis, and the second end is connected to the node A with the first end of the second resistor R2 and the first end of the first capacitor C1. The second end of the second resistor R2 and the second end of the first capacitor C1 are connected to the first functional ground GND1.

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

In the example shown in FIG. 3, the control sub-module 20 includes a first NPN transistor T1 and a first diode D1. The first end of the first NPN transistor T1 is connected to the node A, the second end is connected to the first end of the transmission submodule 30 (ie, the node C), and the third end is connected to the first end of the first diode D1. The second end of the first diode D1 is connected to the first functional ground GND1.

The first NPN transistor T1 is used to control the on and off of the branch T1-D1-GND1, and the first diode D1 is used to increase the turn-on voltage value of the base of the first NPN transistor T1.

In the example shown in FIG. 3, the transmission sub-module 30 includes a third resistor R3, a fourth resistor R4, and an optocoupler device U1. The first end of the optocoupler device U1 is connected to the second end of the third resistor R3, the second end is connected to node C, the third end is connected to the second functional ground GND2, and the fourth end is connected to the second end of the fourth resistor R4 Connect to the output node (ie node B). The first end of the third resistor R3 is connected to the voltage VCC. The first end of the fourth resistor R4 is connected to the voltage VDD.

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

As shown in Figure 4 and Figure 5, when the base station system chassis is grounded normally, since the protective ground PE of the base station system chassis is connected to the N wire at the remote 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, and the first voltage signal obtained at the node A is a sine pulse wave signal VA. When the amplitude of VA is higher than the turn-on voltage of the control sub-module 20 (for example, the threshold voltage of the first NPN transistor T1), the branch VCC-R3-U1-T1-D1-GND1 is turned on, correspondingly the voltage of node B VB 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 sub-module 20, the branch VCC-R3-U1-T1-D1-GND1 is disconnected Turn on, VB will get a high level close to VDD through R4. Then node B will upload the pulse signal VB to the alarm processing platform of the system through the OUT line for processing. When the alarm processing platform receives the pulse signal, it is determined that the base station system chassis is grounded normally.

4 and 5, when the base station system chassis is poorly grounded (that is, the ground is abnormal), the first end of the first resistor R1 is still connected to the protective ground PE, and the current flow in the detection module 10 is still the chassis ground PE -R1-R2-GND1. This is because the electromagnetic compatibility (EMC: Electro Magnetic Compatibility) device in the base station power supply will cause the L line voltage to affect the voltage signal on the base station system chassis. Even if the chassis of the base station system is not grounded, the detection module 10 can also obtain a noise waveform and divide the voltage. The first voltage signal generated at the node A is shown as VA1 in FIG. 5. Compared with the first voltage signal VA generated at node A when the chassis is grounded normally, when the input voltage of the base station system is the same, the frequency and amplitude of VA1 and VA are the same, and the amplitude of VA is greater than the amplitude of VA1 . In order to accurately distinguish between VA1 and VA, the resistance divider ratio in the detection module 10 can be set so that the turn-on voltage of the control sub-module 20 is between the amplitude of VA1 and the amplitude of VA. Therefore, when the base station system chassis When the grounding 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 sub-module 20, so that the branch VCC-R3-U1-T1-D1-GND1 will be disconnected, and VB will pass through R4 To obtain a high level close to VDD, node B will send a constant high level signal to the alarm processing platform. When the alarm processing platform receives the high-level signal, it determines that the base station system chassis is poorly grounded.

Therefore, the poor grounding alarm device according to the embodiment of the present disclosure can transmit the poor grounding of the base station system chassis to the system processing end in real time, and the system can respond accordingly.

The poor grounding alarm device according to the embodiment of the present disclosure adopts the method of detecting the voltage signal of the base station system chassis to determine whether the base station system chassis is grounded abnormally, which increases the safety of the detection circuit. In the presence of noise in the base station system, it can Real-time detection of poor grounding of the base station system chassis, and the device has a simple structure and high integration. It is easy to understand that the poor grounding alarm device according to the embodiments of the present disclosure can also be used for grounding detection of other communication system casings and for performing poor grounding alarms.

The poor grounding alarm device of the embodiment shown in FIG. 3 is completed under the same input voltage, and due to the diversity of application scenarios, sometimes the base station needs to support voltage inputs of different amplitudes, and the detection module 10 detects the first time when the grounding is poor. The amplitude of a voltage signal VA1 and the first voltage signal VA detected when the grounding is normal is proportional to the amplitude of the input voltage, so when the turn-on voltage of the control sub-module 20 is constant and the input voltage of the base station system is different Under high-voltage input, the first voltage signal VA1 (that is, the first voltage signal when the ground is poor) and the first voltage signal VA when the low-voltage input (that is, the first voltage signal when the ground is normal) will become difficult to distinguish, resulting in grounding The bad alarm device cannot accurately determine whether the system has grounding abnormalities.

Figure 5 shows the first voltage signal VA1 detected by the detection module 10 when the ground is poor and the first voltage signal VA detected when the ground is normal. It can be seen that when the input voltage of the base station system is 250V, there is no grounded In this case, the peak value of VA1 reaches about 1.3V, and when the input voltage of the base station system is 90V and the system chassis is grounded normally, the VA obtained by the detection module 10 divided voltage is about 1.5V. Therefore, when the turn-on voltage of the control sub-module 20 is set to 1.4V, the VA1 when the input voltage is 250V is very easy to be confused with the VA when the input voltage is 90V, causing the device to generate a false alarm.

In order to solve this problem, FIG. 6 shows a poor grounding alarm device according to another exemplary embodiment of the present disclosure. The difference from the poor grounding alarm device shown in FIG. 3 lies in the detection module 10.

As shown in FIG. 6, 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 end of the first resistor R1 is connected to the protective ground PE of the base station system chassis, and the second end is connected to the first end of the second resistor R2, the first end of the fifth resistor R5, and the first end of the first capacitor C1. Connect to node A. The second end of the second resistor R2 is coupled with the second end of the first NMOS transistor M1. The first end of the first NMOS transistor M1 is connected to the control signal SR1, and the third end is connected to the second end of the fifth resistor R5 and the second end of the first capacitor C1 to the functional ground GND1.

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 to change the voltage division value VA at node A. The first NMOS tube M1 is used Control the on and off of the branch R5-M1-GND1, and the first capacitor C1 is used to filter the detection module. The components in the control submodule 20, the transmission submodule 30, and the connection relationship between the components in this embodiment are the same as those in the embodiment shown in FIG. 3, and will not be described again.

The poor grounding alarm system using the poor grounding alarm device shown in FIG. 6 is shown in FIG. 11, and includes a base station system chassis, a poor grounding alarm device, and a base station alarm processing platform. The poor grounding alarm device is connected to the communication system chassis and is set to detect the voltage V _{PE of the} communication system chassis, and generate an alarm signal V _B according to the detected first voltage signal and transmit it to the base station alarm processing platform, the alarm signal V _B It is used to indicate that the chassis of the communication system is grounded normally or has a ground fault; the base station alarm processing platform receives the alarm signal and performs alarm processing. In addition, the base station alarm processing platform also sends a control signal SR1 to the bad grounding notification device to control the on and off of the first NMOS transistor M1.

In an exemplary embodiment according to the present disclosure, the base station alarm processing platform is configured to send a first control signal to the control terminal of the first switching device when the input voltage of the communication system is higher than a set threshold, so that the first switching device In the first state, the ratio of the voltage of the intermediate node to the voltage of the communication system chassis (ie, the voltage division ratio) is the first ratio; when the input voltage of the communication system is lower than the set threshold, the first switching device The control terminal sends a second control signal to make the first switching device in the second state. At this time, the ratio of the voltage of the intermediate node to the voltage of the communication system chassis is the second ratio. The first state is one of on and off, the second state is the other of on and off, and the first ratio is smaller than the second ratio. Therefore, when the input voltage of the communication system is higher than the set threshold, the voltage divider ratio is small; when the input voltage of the communication system is lower than the set threshold, the voltage divider ratio is large, so that the high voltage input and poor grounding at the intermediate node The difference between the amplitude of the first voltage signal (VA1) and the amplitude of the first voltage signal (VA) at the intermediate node when the low voltage is input and the ground is normal becomes larger, thereby avoiding the occurrence of the aforementioned false alarm.

In the example, according to the required range of the input voltage of the base station system, 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. Close M1, then branch R5-M1-GND1 is turned on, the voltage dividing ratio of the voltage divider resistance in the detection module 10 becomes smaller, and the amplitude of the first voltage signal VA generated at the intermediate node A decreases when the system chassis is grounded normally When the corresponding system chassis is poorly grounded, the amplitude of the first voltage signal VA1 generated at the intermediate node is also reduced. When the input voltage value of the base station system is lower than the preset value VREF, the base station alarm processing platform disconnects M1 through the control signal SR1, so the branch R5-M1-GND1 is disconnected, and the voltage division ratio of the voltage divider resistance in the module 10 is detected Get bigger. Therefore, the difference in amplitude between the first voltage signal VA detected when low voltage input and the system chassis ground is normal and the first voltage signal VA1 detected when high voltage input and the system chassis ground is poor becomes larger, which is easy It is distinguished, thereby preventing the situation where the two amplitudes are close to cause false alarms. The branch composed of R2 and M1 can also be connected in parallel with R1, and the voltage divider ratio can also be changed, but the above-mentioned control logic needs to be changed. When the base station input voltage is higher than the preset value VREF, the M1 is controlled to be disconnected, and the base station input voltage is low Control M1 to close at the preset value VREF.

Based on the poor grounding alarm device of Figure 6 and the base station alarm processing platform of Figure 11, when the input voltage of the base station system is lower than the preset voltage value VREF in the base station alarm processing platform: refer to Figures 7 and 9, the chassis of the base station system is grounded Normally, since the PE is connected to the N line at the remote end, and the base station warning processing platform turns off the first NMOS tube M1 through SR1, the current in the detection module 10 flows to the chassis ground PE-R1-R2-GND1. The first voltage signal obtained at node A is a sine pulse wave signal VA. When the amplitude of VA is higher than the turn-on voltage of the control sub-module 20, the branch VCC-R3-U1-T1-D1-GND1 is turned on, and accordingly node B will obtain a low level close to GND2 through the optocoupler U1 Signal VB; when the amplitude of VA is lower than the turn-on voltage of the control sub-module 20, branch VCC-R3-U1-T1-D1-GND1 is disconnected, and node B will obtain a high-level signal close to VDD through R4 VB. Then node B uploads the pulse signal VB to the base station alarm processing platform through the OUT line. When the VB received by the base station alarm processing platform is a pulse signal, it is determined that the base station system chassis is grounded normally.

Referring to Figures 7 and 9, when the base station system chassis is poorly grounded, the first end of the first resistor R1 is still connected to the system chassis, and the base station alarm processing platform shuts off the first NMOS tube M1 through SR1. There is still a noise signal of the same frequency on the case, and the current flow in the detection module 10 is still the case ground PE-R1-R2-GND1. By setting the ratio in the detection module 10, the amplitude of the first voltage signal VA1 generated at node A after the noise signal is divided can be lower than the turn-on voltage of the control sub-module 20. Therefore, the branch VCC-R3-U1- T1-D1-GND1 is disconnected, and node B will obtain a high level signal VB close to VDD through R4. Then node B sends a constant high-level signal VB to the base station alarm processing platform. When the VB received by the base station alarm processing platform is a high level signal, it is determined that the base station system chassis is poorly grounded. It is easy to understand that by using different switching devices or different circuits (for example, adding an inverter), the VB when the chassis of the base station system is poorly grounded can also be made a low-level signal.

Based on the poor grounding alarm device of Figure 6 and the base station alarm processing platform of Figure 11, when the input voltage of the base station system is higher than the preset voltage value VREF in the base station alarm processing platform, referring to Figures 8 and 9, in the base station system machine When the case grounding is normal, because the PE is connected to the N line at the remote end, and the base station alarm processing platform turns on the first NMOS tube M1 through SR1, the current flow in the detection module 10 is the case ground PE-R1-R2-GND1 And PE-R1-R5-M1-GND1. The first voltage signal obtained at node A is the sine pulse wave signal VA, and due to the conduction of the branch R5-M1-GND1, the voltage division ratio in the detection module 10 is reduced relative to the low voltage input, and the corresponding VA The amplitude of VA will also be reduced, and 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 will still be turned on, and node B will pass through the optocoupler U1 Obtain a low-level signal VB close to GND2. When the amplitude of VA is lower than the turn-on voltage of the control sub-module 20, the branch VCC-R3-U1-T1-D1-GND1 is disconnected, and the node B will obtain a high-level signal VB close to VDD through R4. Then node B uploads the pulse signal VB to the base station alarm processing platform through the OUT line for processing. When the VB received by the base station alarm processing platform is a pulse signal, it is determined that the base station system chassis is grounded normally.

Referring to Figures 8 and 9, when the base station system chassis is poorly grounded, the first end of the first resistor R1 is still connected to the system chassis, and the base station alarm processing platform turns on the first NMOS tube M1 through SR1. There is still a noise signal of the same frequency on the case, and the current flow in the detection module 10 is still the case ground PE-R1-R2-GND1 and PE-R1-R5-M1-GND1. Due to the conduction of the branch R5-M1-GND1, the amplitude of the first voltage signal VA1 obtained at the node by dividing the noise signal will be reduced, effectively preventing the detection interference caused by the low voltage input. And the amplitude of VA1 generated by the voltage division of the noise signal is lower than the turn-on voltage of the control sub-module 20, the branch VCC-R3-U1-T1-D1-GND1 is disconnected, and the node B will obtain a voltage close to VDD through R4 The high level signal VB. After that, node B sends a constant high-level signal VB to the alarm processing platform through the OUT line. When the VB received by the alarm processing platform is a high-level signal, it is determined that the base station system chassis is poorly grounded.

Therefore, when the input voltage of the base station system is higher than the preset voltage value VREF in the base station alarm processing platform, the alarm device according to the embodiment of the present disclosure will be able to transmit the bad grounding of the base station chassis to the system processing end in real time. The base station alarm processing platform responds accordingly.

Fig. 9 shows the first voltage signal VA detected by the detection module 10 when the ground is normal and the first voltage signal VA1 detected when the ground is poor under different input voltages after the branch R5-M1-GND1 is added. It can be seen that when the input voltage is 250V, the amplitude of the first voltage signal VA1 when the ground is poor is significantly smaller, and is only about 0.9V, while when the input voltage is 90V, the first voltage signal when the ground is normal is 1.5V. That is, the difference between the first voltage signal VA1 detected when high voltage input and poor grounding and the first voltage signal VA detected when low voltage input and normal grounding increases, which effectively solves the problem of controlling submodule 20 under different input voltages. When the turn-on voltage is constant, VA1 and VA cannot be distinguished, which leads to a false alarm.

In summary, the amplitude of the noise signal on the system chassis will increase with the increase of the input voltage. Therefore, when the input voltage is high and the grounding is poor, the amplitude of the first voltage signal VA1 generated by dividing the noise signal The value is higher. When the turn-on voltage of the control sub-module 20 (that is, the above-mentioned turn-on voltage) is constant, it is very easy to be confused with the first voltage signal VA generated when the low voltage is input and the ground is normal, resulting in the error of the poor grounding alarm device According to the setting of the branch R5-M1-GND1 in the embodiment of the present disclosure, when high voltage is input and the ground is poor, the VA1 generated by the partial voltage of the noise signal is reduced, which effectively prevents the VA1 from being low. The first voltage signal VA generated when the voltage is input and the ground is normal cannot distinguish the problem that caused the false alarm.

According to the poor grounding warning device and the poor grounding warning system proposed by the embodiments of the present disclosure, the method of detecting the voltage signal of the base station system chassis is adopted to determine whether the base station system is grounded abnormally, which increases the safety of the detection circuit and solves the problem of noise on the ground. It is affected by the bad alarm device, and can detect the bad grounding condition of the equipment at different input voltages, with high reliability and simple structure.

The structure of the poor grounding alarm device according to the exemplary embodiment of the embodiment of the present disclosure is shown in FIG. 10, and its structure is basically the same as the embodiment shown in FIG. 6, with the following differences: the detection module 10 of this embodiment includes a first The resistor R1, the second resistor R2, the fifth resistor R5, the sixth resistor R6, the second NPN transistor T2, and the first capacitor C1. The first end of the first resistor R1 is connected to the power supply system chassis ground PE, and the second end is connected to the first end of the second resistor R2, the first end of the fifth resistor R5, and the first end of the first capacitor C1. Node A. The second end of the fifth resistor R5 is connected to the second end of the second NPN transistor T2. The first end of the second NPN transistor T2 and the first end of the sixth resistor R6 are connected to the control signal SR1, the third end of the second NPN transistor T2 and the second end of the second resistor R2, the first end of the first capacitor C1 The second terminal and the second terminal of the sixth resistor R6 are connected to the first functional ground GND1.

The first resistor R1 and the second resistor R2 are used to divide the voltage V _PE , the fifth resistor R5 is used in parallel with the second resistor R2 to change the divided voltage value VA obtained by the node A, the second NPN transistor T2 and the sixth The resistor R6 is used to control the on and off of the branch R5-T2-GND1, and the first capacitor C1 is used to filter the detection module. Compared with the embodiment shown in FIG. 6, this embodiment uses a switching device composed of a second NPN transistor T2 and a sixth resistor R6 instead of the switching device in FIG. 6 that is the first NMOS transistor M1.

The components in the control submodule 20, the transmission submodule 30, and the connection relationship between the components in this embodiment are the same as those in the embodiment shown in FIG. 6, and will not be repeated here.

When high voltage is input, the base station alarm processing platform turns on T2 through SR1, and when low voltage is input, the base station alarm processing platform turns off T2 through SR1. Otherwise, the action process of this embodiment may be the same as that of the embodiment shown in FIG. 6, which will not be repeated here.

It should be noted that both the NMOS transistor of the detection module 10 in FIG. 6 and the NPN transistor in FIG. 10 can be changed by those skilled in the art into PMOS transistors, PNP transistors and other switching device circuits to control the voltage division ratio of the detection module, but Without departing from the spirit of the present disclosure, all these changes will fall within the protection scope of the present disclosure.

It should be noted that the first diode D1 in the control sub-module 20 can also be placed at the base of the first NPN transistor T1, that is, the first end of the diode D1 is connected to the detection module 10, and the second end is connected to the The base of an NPN transistor T1. If the conduction voltage of the control sub-module 20 needs to be changed, the base of the first NPN transistor T1 or the number of diodes connected in series with the emitter can be adjusted as required. However, without departing from the spirit of the present disclosure, these changes will fall within the protection scope of the present disclosure.

It should be noted that, in addition to optocoupler devices, the isolation devices in the transmission module 30 may also be isolation transformers, isolation chips, etc., but these changes will fall within the protection scope of the present disclosure without departing from the spirit of the invention.

In the description of this specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiments", etc. means that the features, structures, materials, or characteristics described in conjunction with the embodiment or examples are included in the present disclosure. In at least one embodiment or example. In this specification, the schematic representations of the above-mentioned terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. Although the embodiments disclosed in the present disclosure are as described above, the content described is only the embodiments used to facilitate the understanding of the present disclosure, and is not intended to limit the present disclosure. Anyone skilled in the art to which this disclosure belongs, without departing from the spirit and scope disclosed in this disclosure, can make any modifications and changes in the implementation form and details, but the scope of patent protection of this disclosure still requires The scope defined by the appended claims shall prevail.

Claims

An alarm device for poor grounding, including a detection module and an alarm module, wherein:

The detection module is configured to detect the voltage of the chassis of the communication system to obtain a first voltage signal, and

The alarm module is configured to generate and output an alarm signal according to the first voltage signal, and the alarm signal is used to indicate that the communication system chassis is grounded normally or has a ground fault.
The poor grounding warning device of claim 1, wherein the warning module comprises:

The control sub-module is configured to generate a first level signal according to the first voltage signal, wherein the first level signal generated according to the first voltage signal is different when the communication system chassis is grounded normally or has a ground fault; as well as

The transmission sub-module is configured to generate the alarm signal according to the first level signal, and transmit the alarm signal to an external alarm processing platform.
The poor grounding warning device according to claim 2, wherein:

When the communication system chassis is grounded normally, 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.
The poor grounding warning device according to claim 2, wherein:

The detection module includes a voltage divider circuit configured to divide the voltage of the communication system chassis, and output a voltage signal at an 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 poor grounding alarm device.
The poor grounding warning device according to claim 3, wherein:

The voltage dividing circuit includes a first voltage dividing branch and a second voltage dividing branch connected in series, both ends of the first voltage dividing branch are connected to the protective ground and the intermediate node, respectively, and the second Two ends of the pressure dividing branch are respectively connected to the intermediate node and the first functional ground;

The first voltage dividing branch includes a first resistor;

The second voltage dividing branch includes a second resistor, or includes a second resistor and a first capacitor connected in parallel.
The poor grounding warning device according to claim 4, wherein:

The voltage dividing circuit further includes a third voltage dividing branch connected in parallel with the first voltage dividing branch or the second voltage dividing branch, and the third voltage dividing branch includes a first switching device connected in series and Fifth resistance

The first switching device is configured to receive an external control signal to control the on-off of the third voltage dividing branch.
The poor grounding warning device according to any one of claims 4 to 6, wherein:

The control sub-module includes a switch circuit connected between a first node and the first functional ground of the poor grounding alarm device, and the switch circuit is configured to control the first voltage signal according to the first voltage signal. The circuit between the node and the first functional ground of the poor grounding alarm device is turned on and off to generate the first level signal at the first node.
The poor grounding warning device according to claim 7, wherein:

The switching circuit includes a second switching device, a first end of the second switching device is connected to an intermediate node of the detection module, a second end of the second switching device is connected to the first node, and The third terminal of the second switching device is connected to the first functional ground;

When the first voltage signal changes from greater than the turn-on voltage of the second switching device to less than the turn-on voltage, or from less than the turn-on voltage to greater than the turn-on voltage, the electrical level of the first level signal The average value changes.
The poor grounding warning device according to any one of claims 4 to 6, wherein:

The transmission sub-module includes an isolation circuit configured to generate a second level signal electrically isolated from the first level signal according to the first level signal, and use the second level signal as the alarm The signal is uploaded to the alarm processing platform.
The poor grounding warning device according to claim 9, wherein:

The isolation circuit includes a first signal branch and a second signal branch, a first end of the first signal branch is connected to a first power source, and a second end of the first signal branch is connected to the control A first node of the submodule for outputting the first level signal;

The first end of the second signal branch is connected to a second power source different from the first power source, and the second end of the second signal branch is connected to the second functional ground of the poor grounding alarm device. , The second functional ground is different from the first functional ground;

The first signal branch includes a third resistor and an isolation device connected in series, the second signal branch includes a fourth resistor and the isolation device connected in series, and the first signal branch and the second signal branch pass through The isolation devices are coupled together to achieve electrical isolation, and the alarm signal is output from a node between the fourth resistor and the isolation device.
A poor grounding warning system, comprising a communication system chassis, the poor grounding warning device according to any one of claims 1 to 10, and an alarm processing platform, wherein:

The poor grounding alarm device is connected to the communication system casing, and is configured to detect the voltage of the communication system casing, and generate an alarm signal according to the detected first voltage signal and transmit the alarm signal to the alarm Processing platform

The alarm signal is used to indicate that the communication system chassis is grounded normally or has a ground fault;

The alarm processing platform is configured to receive the alarm signal and perform alarm processing.
The poor grounding warning system of claim 11, wherein:

The poor grounding alarm device includes the poor grounding alarm device according to claim 6;

The alarm processing platform is also set to:

When the input voltage of the communication system is higher than the set threshold, the first control signal is sent to the control terminal of the first switching device to make the first switching device in the first state, so that the voltage of the intermediate node The ratio of the voltage to the chassis of the communication system is the 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 make the first switching device in the second state, so that the intermediate node The ratio of the voltage of and the voltage of the communication system chassis is the second ratio;

The first state is one of on and off, the second state is the other of on and off, and the first ratio is smaller than the second ratio.