Radio interference signal detection circuit and method

Abstract

The invention discloses a radio interference signal detection circuit and method, and relates to the field of interference signal detection, a first switch tube is used for being switched on when no voltage signal is zero so as to output a first low level signal, and is switched off when the voltage signal is greater than a preset voltage threshold; the first pull-up resistor is used for pulling up the control end of the second switch tube to a first high-level signal when the first switch tube is switched off; the second switch tube is used for being switched on when the first switch tube outputs the first low-level signal so as to output a second high-level signal, and is switched off when the first switch tube is switched off; and the signal processing module is used for processing the level signal of the first end of the signal processing module and outputting a detection signal to the signal identification module, so that the signal identification module detects the radio interference signal. According to the invention, the voltage signal is converted into the detection signal through the first switch tube, the first pull-up resistor, the second switch tube and the signal processing module, thereby achieving the detection of the radio interference signal.

Description

Technical Field

[0001] The present invention relates to the field of detection of interference signals, and particularly to a detection circuit and method for radio interference signals. Background Art

[0002] With the rapid development of society, the demand for electric power resources is increasing, but at the same time, there are also waste and electricity theft behaviors of electric power resources. Some unruly residents use certain electromagnetic interference methods to damage metering devices such as electric meters, resulting in the inability of the metering devices to perform normal metering work and achieving the purpose of electricity theft. Currently, metering devices such as electric meters usually lack means to prevent electricity theft interference and cannot effectively detect radio interference signals. Summary of the Invention

[0003] The object of the present invention is to provide a detection circuit and method for radio interference signals, which can convert a voltage signal into a detection signal by using an antenna, a first switching tube, a first pull-up resistor, a second switching tube, and a signal processing module to achieve the detection of radio interference signals. The specific scheme is as follows:

[0004] In a first aspect, the present invention provides a detection circuit for radio interference signals, including an antenna, a first switching tube, a first pull-up resistor, a second switching tube, and a signal processing module;

[0005] The antenna is connected to the control end of the first switching tube for receiving a voltage signal;

[0006] The first end of the first switching tube is connected to the common end of the first end of the first pull-up resistor and the control end of the second switching tube, and the second end of the first switching tube is grounded, and is used to conduct when there is no voltage signal to output a first low-level signal and turn off when the voltage signal is greater than a preset voltage threshold;

[0007] The second end of the first pull-up resistor is connected to the first end of the second switching tube, and the common end after connection is connected to a power supply voltage, and is used to pull up the control end of the second switching tube to a first high-level signal when the first switching tube is turned off;

[0008] The second end of the second switching tube is connected to the first end of the signal processing module, and is used to conduct when the first switching tube outputs the first low-level signal to output a second high-level signal and turn off when the first switching tube is turned off;

[0009] The signal processing module is connected to a signal recognition module, and is used to process the level signal at the first end of the signal processing module and output a detection signal to the signal recognition module so that the signal recognition module can detect radio interference signals.

[0010] Optionally, the signal processing module includes a first capacitor, a first resistor, a third switching transistor, and a second pull-up resistor, and the third switching transistor is a first triode or an NMOS transistor;

[0011] A first end of the first capacitor is connected to a common end of a second end of the second switching transistor and a first end of the first resistor, and the connected common end is a first end of the signal processing module. A second end of the first capacitor is grounded and is used to jointly adjust a frequency of a level signal at the first end of the signal processing module with the first resistor;

[0012] A second end of the first resistor is connected to a control end of the third switching transistor;

[0013] A first end of the third switching transistor is connected to a first end of the second pull-up resistor, and the connected common end serves as a second end of the signal processing module. A second end of the third switching transistor is grounded and is used to conduct when a level signal at the first end of the signal processing module is a high-level signal, so as to output a detection signal of a second low-level signal, and to turn off when the second switching transistor is turned off.

[0014] Optionally, the first switching transistor is a first PMOS transistor, a gate of the first PMOS transistor is connected to the antenna, a drain of the first PMOS transistor is grounded, and a source of the first PMOS transistor is connected to a common end of a first end of the first pull-up resistor and a control end of the second switching transistor.

[0015] Optionally, a second resistor is further included. A first end of the second resistor is connected to a common end of the gate of the first PMOS transistor and the antenna, and a second end of the second resistor is connected to the drain of the first PMOS transistor and is used for discharging to protect the first PMOS transistor.

[0016] Optionally, the second switching transistor is a second triode or a second PMOS transistor.

[0017] Optionally, a current-limiting resistor is further included. A first end of the current-limiting resistor is connected to a common end of a first end of the first switching transistor and a first end of the first pull-up resistor, and a second end of the first current-limiting resistor is connected to a control end of the second switching transistor.

[0018] Optionally, a zener diode is further included. A first end of the zener diode is connected to a common end of the antenna and a first end of the first switching transistor, and a second end of the zener diode is grounded.

[0019] Optionally, a filtering module and a high-pass filtering module are further included;

[0020] The filtering module includes a third resistor and a second capacitor. The first end of the third resistor is connected to the common end of the second end of the signal processing module and the first end of the second capacitor. The second end of the third resistor is connected to the signal recognition module, and the second end of the second capacitor is grounded;

[0021] The high-pass filtering module includes a fourth resistor and a third capacitor. The first end of the fourth resistor is connected to the common end of the antenna and the first end of the third capacitor. The second end of the fourth resistor is grounded, and the second end of the third capacitor is connected to the control end of the first switching tube.

[0022] In a second aspect, the present invention provides a method for detecting a radio interference signal, which is applied to the above-mentioned radio interference signal detection circuit. The radio interference signal detection circuit further includes a signal recognition module, and the signal processing module is connected to the signal recognition module. The method includes:

[0023] Receiving a voltage signal through the antenna;

[0024] When there is no such voltage signal, controlling the first switching tube to conduct, so that the first switching tube outputs a first low-level signal, and when the voltage signal is greater than a preset voltage threshold, controlling the first switching tube to turn off;

[0025] When the first switching tube is turned off, pulling up the control end of the second switching tube to a first high-level signal through a first pull-up resistor;

[0026] Based on the first low-level signal, controlling the second switching tube to conduct, so that the second switching tube outputs a second high-level signal, and when the first switching tube is turned off, controlling the second switching tube to turn off;

[0027] Processing the level signal at the first end of the signal processing module through the signal processing module and outputting a detection signal;

[0028] Based on the waveform of the detection signal within a preset period, identifying the type of radio interference signal through the signal recognition module.

[0029] Optionally, identifying the type of interference signal based on the waveform of the detection signal within a preset period through the signal recognition module includes:

[0030] If the waveform of the detection signal is a high-level signal for a first preset time within the preset period, the interference signal is a spark interference signal;

[0031] If the waveform of the detection signal is a periodic level signal with a first frequency within the preset period, the interference signal is a strong static electricity interference signal;

[0032] If the waveform of the detection signal is a periodic level signal of a second frequency within the preset period, the interference signal is a strong radio electromagnetic wave interference signal, where the first frequency is less than the second frequency.

[0033] This application provides a detection circuit and method for radio interference signals. The detection circuit for radio interference signals includes an antenna, a first switching tube, a first pull-up resistor, a second switching tube, and a signal processing module; the antenna is connected to the control end of the first switching tube for receiving a voltage signal; the first end of the first switching tube is connected to the common end of the first end of the first pull-up resistor and the control end of the second switching tube, and the second end of the first switching tube is grounded, and is used to conduct when the voltage signal is zero to output a first low-level signal, and turn off when the voltage signal is greater than the preset voltage threshold; the second end of the first pull-up resistor is connected to the first end of the second switching tube, and the common end after connection is connected to the power supply voltage, and is used to pull up the control end of the second switching tube to a first high-level signal when the first switching tube is turned off; the second end of the second switching tube is connected to the first end of the signal processing module, and is used to conduct when the first switching tube outputs the first low-level signal to output a second high-level signal, and turn off when the first switching tube is turned off; the signal processing module is connected to the signal recognition module, and is used to process the level signal at the first end of the signal processing module and output a detection signal to the signal recognition module, so that the signal recognition module can detect the radio interference signal. It can be seen that this application converts the voltage signal into a detection signal through the antenna, the first switching tube, the first pull-up resistor, the second switching tube, and the signal processing module, so that the signal recognition module can detect the radio interference signal. Description of the Drawings

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the prior art and the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] Figure 1 It is a schematic structural diagram of a detection circuit for radio interference signals disclosed by the present invention;

[0036] Figure 2 It is a schematic diagram of the principle of the first specific detection circuit for radio interference signals disclosed by the present invention;

[0037] Figure 3 It is a schematic diagram of the principle of the second specific detection circuit for radio interference signals disclosed by the present invention;

[0038] Figure 4Schematic diagram of the third specific radio interference signal detection circuit disclosed in the present invention;

[0039] Figure 5 Schematic diagram of the fourth specific radio interference signal detection circuit disclosed in the present invention;

[0040] Figure 6 Flowchart of a method for detecting radio interference signals disclosed in the present invention;

[0041] The reference signs are as follows: 1 is the first switching tube, 2 is the second switching tube, and 3 is the signal processing module. Detailed implementation manners

[0042] The core of the present invention is to provide a radio interference signal detection circuit and method, which can convert a voltage signal into a detection signal by using an antenna, a first switching tube, a first pull-up resistor, a second switching tube, and a signal processing module, so as to realize the detection of radio interference signals.

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0044] Currently, metering devices such as electric meters usually lack means to prevent power theft interference and cannot effectively detect radio interference signals.

[0045] To solve the above technical problems, the present invention provides a radio interference signal detection circuit.

[0046] Specifically, please refer to Figure 1 as shown in Figure 1 Schematic structural diagram of a radio interference signal detection circuit disclosed in the present invention.

[0047] The radio interference signal detection circuit includes an antenna ANT1, a first switching tube 1, a first pull-up resistor RR1, a second switching tube 2, and a signal processing module 3;

[0048] The antenna ANT1 is connected to the control end of the first switching tube 1 and is used to receive a voltage signal;

[0049] The first end of the first switching tube 1 is connected to the common end of the first end of the first pull-up resistor RR1 and the control end of the second switching tube 2. The second end of the first switching tube 1 is grounded and is used to conduct when there is no voltage signal to output a first low-level signal and turn off when the voltage signal is greater than a preset voltage threshold;

[0050] The second terminal of the first pull-up resistor RR1 is connected to the first terminal of the second switching transistor 2, and the common terminal after connection is connected to the power supply voltage, and is used to pull up the control terminal of the second switching transistor 2 to a first high-level signal when the first switching transistor 1 is turned off;

[0051] The second terminal of the second switching transistor 2 is connected to the first terminal of the signal processing module 3, and is used to conduct when the first switching transistor 1 outputs a first low-level signal to output a second high-level signal, and to turn off when the first switching transistor 1 is turned off;

[0052] The signal recognition module is connected to the signal processing module 3, and is used to process the level signal at the first terminal of the signal processing module 3 and output a detection signal to the signal recognition module, so that the signal recognition module can detect the radio interference signal.

[0053] The detection circuit for the radio interference signal includes an antenna ANT1, a first switching transistor 1, a first pull-up resistor RR1, a second switching transistor 2, and a signal processing module 3. Based on whether the antenna ANT1 receives a radio interference signal, there are two possibilities for the detection signal output from the second terminal of the signal processing module 3.

[0054] In the first specific embodiment, when there is no radio interference signal, there is no input voltage signal, and the control terminal of the first switching transistor 1 is a low-level signal. Since the first terminal of the first switching transistor 1 is connected to the power supply voltage through the first pull-up resistor RR1, the voltage at the first terminal of the first switching transistor 1 is greater than the voltage at the control terminal of the first switching transistor 1, and the first switching transistor 1 conducts, and the second terminal of the first switching transistor 1 is grounded, so the first terminal of the first switching transistor 1 is pulled down to a low level, and the first switching transistor 1 outputs a first low-level signal; since the first terminal of the first switching transistor 1 is connected to the common terminal of the first terminal of the first pull-up resistor RR1 and the control terminal of the second switching transistor 2, the control terminal of the second switching transistor 2 is a first low-level signal, the first terminal of the second switching transistor 2 is the power supply voltage, and the voltage at the first terminal of the second switching transistor 2 is greater than the voltage at the control terminal of the second switching transistor 2, so the second switching transistor 2 conducts, and the second terminal of the second switching transistor 2 outputs the power supply voltage; the signal processing module 3 adjusts the frequency of the power supply voltage at the first terminal of the signal processing module 3 to output a smooth low-level detection signal.

[0055] In the second specific embodiment, when there is a radio interference signal, if the voltage signal received by the antenna ANT1 is greater than the preset voltage threshold, the control terminal of the first switching transistor 1 is a high-level signal. The preset voltage threshold is the conduction voltage of the first switching transistor 1. Since the voltage at the control terminal of the first switching transistor 1 is greater than the conduction voltage, the first switching transistor 1 is turned off. Since the first end of the first pull-up resistor RR1 is connected to the control terminal of the second switching transistor 2, the control terminal of the second switching transistor 2 is pulled up to a first high-level signal by the first pull-up resistor RR1. The first end of the second switching transistor 2 is the power supply voltage. The voltage at the first end of the second switching transistor 2 and the voltage at the control terminal of the second switching transistor 2 are less than the conduction voltage of the second switching transistor 2, so the second switching transistor 2 is turned off. When the second switching transistor 2 is turned off, the first end of the signal processing module 3 is a low-level signal, and the signal processing module 3 adjusts the frequency of the low-level signal to output a smooth high-level detection signal.

[0056] It can be seen that in this application, the voltage signal is converted into a detection signal through the antenna ANT1, the first switching transistor 1, the first pull-up resistor RR1, the second switching transistor 2, and the signal processing module 3, realizing the detection of radio interference signals.

[0057] Based on the above embodiments:

[0058] Specifically, if the second switching transistor 2 is the second triode Q2 and the third switching transistor is the first triode Q1, please refer to Figure 2 as shown in Figure 2 which is the schematic diagram of the first specific radio interference signal detection circuit disclosed in the present invention; if the second switching transistor 2 is the second PMOS transistor P2 and the third switching transistor is the NMOS transistor N, please refer to Figure 3 as shown in Figure 3 which is the schematic diagram of the second specific radio interference signal detection circuit disclosed in the present invention; if the second switching transistor 2 is the second triode Q2 and the third switching transistor is the NMOS transistor N, please refer to Figure 4 as shown in Figure 4 which is the schematic diagram of the third specific radio interference signal detection circuit disclosed in the present invention; if the second switching transistor 2 is the second PMOS transistor P2 and the third switching transistor is the first triode Q1, please refer to Figure 5 as shown in Figure 5 which is the schematic diagram of the fourth specific radio interference signal detection circuit disclosed in the present invention.

[0059] As an optional embodiment, the signal processing module 3 includes a first capacitor C1, a first resistor R1, a third switching transistor, and a second pull-up resistor RR2. The third switching transistor is the first triode Q1 or the NMOS transistor N;

[0060] The first end of the first capacitor C1 is connected to the common end of the second end of the second switching transistor 2 and the first end of the first resistor R1, and the common end after connection is the first end of the signal processing module 3. The second end of the first capacitor C1 is grounded and is used to jointly adjust the frequency of the level signal at the first end of the signal processing module 3 with the first resistor R1;

[0061] The second end of the first resistor R1 is connected to the control end of the third switching transistor;

[0062] The first end of the third switching transistor is connected to the first end of the second pull-up resistor RR2, and the common end after connection is used as the second end of the signal processing module 3. The second end of the third switching transistor is grounded and is used to conduct when the level signal at the first end of the signal processing module 3 is a high-level signal to output a detection signal of a second low-level signal and to turn off when the second switching transistor 2 is turned off.

[0063] Specifically, when the second end of the second switching transistor 2 outputs a power supply voltage, the first capacitor C1 and the first resistor R1 adjust the frequency of the power supply voltage. The third switching transistor conducts. Since the second end of the third switching transistor is grounded, the first end of the third switching transistor gently outputs a detection signal of a second low-level signal. When the second switching transistor 2 is turned off, the control end of the third switching transistor is grounded through the first capacitor C1 and the first resistor R1. The control end of the third switching transistor is a low-level signal. The first capacitor C1 and the first resistor R1 adjust the frequency of the low-level signal. The third switching transistor is turned off. The second end of the signal processing module 3 is connected to the power supply voltage through the second pull-up resistor RR2. The second end of the signal processing module 3 is pulled up to a high level by the second pull-up resistor RR2, and the second end of the signal processing module 3 gently outputs a detection signal of a high level.

[0064] It should be noted that if the third switching transistor is the first triode Q1, the base of the first triode Q1 is connected to the second end of the first resistor R1, the collector of the first triode Q1 is connected to the first end of the second pull-up resistor RR2, and the common end after connection is used as the second end of the signal processing module 3. The emitter of the first triode Q1 is grounded. If the third switching transistor is the NMOS transistor N, the gate of the NMOS transistor N is connected to the second end of the first resistor R1, the drain of the NMOS transistor N is connected to the first end of the second pull-up resistor RR2, and the common end after connection is used as the second end of the signal processing module 3. The source of the NMOS transistor N is grounded.

[0065] It can be seen that in this embodiment, the first capacitor C1 and the first resistor R1 are used to adjust the frequency of the level signal at the first end of the signal processing module 3 so that the signal recognition module can detect the detection signal and realize the detection of the radio interference signal.

[0066] As an alternative embodiment, the first switching transistor 1 is a first PMOS transistor P1. The gate of the first PMOS transistor P1 is connected to the antenna ANT1. The drain of the first PMOS transistor P1 is grounded. The source of the first PMOS transistor P1 is connected to the common terminal of the first end of the first pull-up resistor RR1 and the control terminal of the second switching transistor 2.

[0067] Specifically, when there is no radio interference signal, there is no input voltage signal, and the gate of the first PMOS transistor P1 is at a low-level signal. Since the source of the first PMOS transistor P1 is connected to the power supply voltage via the first pull-up resistor RR1, the voltage of the source of the first PMOS transistor P1 is greater than the voltage of the gate of the first PMOS transistor P1. The first PMOS transistor P1 is turned on, and the drain of the first PMOS transistor P1 is grounded. Therefore, the source of the first PMOS transistor P1 is pulled down to a low level, and the first PMOS transistor P1 outputs a first low-level signal. Since the source of the first PMOS transistor P1 is connected to the common terminal of the first end of the first pull-up resistor RR1 and the control terminal of the second switching transistor 2, the control terminal of the second switching transistor 2 is at the first low-level signal. The first end of the second switching transistor 2 is at the power supply voltage. The voltage of the first end of the second switching transistor 2 is greater than the voltage of the control terminal of the second switching transistor 2. Therefore, the second switching transistor 2 is turned on, and the second end of the second switching transistor 2 outputs the power supply voltage. The signal processing module 3 adjusts the frequency of the power supply voltage at the first end of the signal processing module 3 to output a smooth low-level detection signal.

[0068] When there is a radio interference signal, if the voltage signal received by the antenna ANT1 is greater than the preset voltage threshold, the gate of the first PMOS transistor P1 is at a high-level signal. The preset voltage threshold is the turn-on voltage of the first PMOS transistor P1. The voltage of the gate of the first PMOS transistor P1 is greater than the turn-on voltage. Therefore, the first PMOS transistor P1 is turned off. Since the first end of the first pull-up resistor RR1 is connected to the control terminal of the second switching transistor 2, the control terminal of the second switching transistor 2 is pulled up to a first high-level signal by the first pull-up resistor RR1. The first end of the second switching transistor 2 is at the power supply voltage. The voltage of the first end of the second switching transistor 2 and the voltage of the control terminal of the second switching transistor 2 are less than the turn-on voltage of the second switching transistor 2. Therefore, the second switching transistor 2 is turned off. When the second switching transistor 2 is turned off, the first end of the signal processing module 3 is at a low-level signal. The signal processing module 3 adjusts the frequency of the low-level signal to output a smooth high-level detection signal. It should be noted that the first PMOS transistor P1 is negatively conductive.

[0069] It can be seen that the first PMOS transistor P1 is negatively conductive, and can achieve that when there is no input voltage signal, the first PMOS transistor P1 is turned on, and the source of the first PMOS transistor P1 is pulled down to a low level.

[0070] As an alternative embodiment, it further includes a second resistor R2. The first end of the second resistor R2 is connected to the common end of the gate of the first PMOS transistor P1 and the antenna ANT1, and the second end of the second resistor R2 is connected to the drain of the first PMOS transistor P1, for discharging to protect the first PMOS transistor P1.

[0071] When the first switching transistor 1 is the first PMOS transistor P1, considering that the gate of the first PMOS transistor P1 is easily broken down by static electricity, and the input impedance of the gate of the first PMOS transistor P1 is large, it is difficult to release the charge energy. High voltage can easily break down the insulation layer inside the first PMOS transistor P1, causing irreversible damage. For this reason, in this embodiment, a second resistor R2 is provided between the gate and the drain of the first PMOS transistor P1. The second resistor R2 is a large resistor, which can release excessive induced voltage energy to protect the first PMOS transistor P1. In addition, different resistance values can be selected for the second resistor R2 to meet the requirements of the sensitivity for detecting radio interference signals.

[0072] It can be seen that in this embodiment, a second resistor R2 is provided between the gate and the drain of the first PMOS transistor P1, and the second resistor R2 can release excessive induced voltage energy to protect the first PMOS transistor P1.

[0073] As an alternative embodiment, the second switching transistor 2 is a second triode Q2 or a second PMOS transistor P2.

[0074] If the second switching transistor 2 is the second triode Q2, the base of the second triode Q2 is connected to the common end of the first end of the first switching transistor 1 and the first end of the first pull-up resistor RR1. The collector of the second triode Q2 is connected to the power supply voltage, and the emitter of the second triode Q2 is connected to the first end of the signal processing module 3. If the second switching transistor 2 is the second PMOS transistor P2, the gate of the second PMOS transistor P2 is connected to the first end of the first pull-up resistor RR1. The source of the second PMOS transistor P2 is connected to the power supply voltage, and the drain of the second PMOS transistor P2 is connected to the first end of the signal processing module 3.

[0075] It can be seen that both when the second switching transistor 2 is the second triode Q2 or the second PMOS transistor P2 can achieve conduction when the first switching transistor 1 outputs a first low-level signal to output a second high-level signal, and turn off when the first switching transistor 1 is turned off.

[0076] As an alternative embodiment, it further includes a current-limiting resistor RT. The first end of the current-limiting resistor RT is connected to the common end of the first end of the first switching transistor 1 and the first end of the first pull-up resistor RR1, and the second end of the first current-limiting resistor RT is connected to the control end of the second switching transistor 2.

[0077] Considering that an excessive current at the control terminal of the second switching transistor 2 may cause the second switching transistor 2 to enter the saturation state, thereby losing its amplification function. Therefore, in this embodiment, a current-limiting resistor RT is connected in series at the control terminal of the second switching transistor 2, which can limit the current at the control terminal of the second switching transistor 2 and avoid damaging the second switching transistor 2 due to excessive current.

[0078] It can be seen that in this embodiment, a current-limiting resistor RT is connected in series at the control terminal of the second switching transistor 2, which can limit the current at the control terminal of the second switching transistor 2, avoid damaging the second switching transistor 2 due to excessive current, and improve the reliability of the radio interference signal detection circuit.

[0079] As an alternative embodiment, it further includes a zener diode Z. The first end of the zener diode Z is connected to the common end of the antenna ANT1 and the first end of the first switching transistor 1, and the second end of the zener diode Z is grounded.

[0080] When the antenna ANT1 receives a radio interference signal, the voltage signal will suddenly fluctuate. To avoid damaging the first switching transistor 1 when the input voltage signal exceeds the breakdown voltage of the first switching transistor 1, a zener diode Z is provided at the control terminal of the first switching transistor 1 in this embodiment. When the voltage signal suddenly fluctuates, the zener diode Z will conduct and absorb the excess voltage.

[0081] It can be seen that if the voltage signal suddenly fluctuates, the zener diode Z will conduct and absorb the excess voltage, thereby avoiding breakdown of the first switching transistor 1 and improving the safety of the radio interference signal detection circuit.

[0082] As an alternative embodiment, it further includes a filtering module and a high-pass filtering module;

[0083] The filtering module includes a third resistor R3 and a second capacitor C2. The first end of the third resistor R3 is connected to the common end of the second end of the signal processing module 3 and the first end of the second capacitor C2. The second end of the third resistor R3 is connected to the signal recognition module, and the second end of the second capacitor C2 is grounded;

[0084] The high-pass filtering module includes a fourth resistor R4 and a third capacitor C3. The first end of the fourth resistor R4 is connected to the common end of the antenna ANT1 and the first end of the third capacitor C3. The second end of the fourth resistor R4 is grounded, and the second end of the third capacitor C3 is connected to the control terminal of the first switching transistor 1.

[0085] To make the detection of the detection signal more accurate, a filtering module can be set between the signal processing module 3 and the signal recognition module. The filtering module includes a third resistor R3 and a second capacitor C2. The third resistor R3 and the second capacitor C2 together form an RC filter, which is used to filter out the clutter in the detection signal output by the signal processing module 3, so that the signal recognition module can perform accurate detection and collect more accurate detection signals. Considering that low-frequency signals have no practical significance for the processing and analysis of voltage signals and may even interfere with the normal transmission of voltage signals, a high-pass filtering module can be set between the antenna ANT1 and the first switching tube 1. The high-pass filtering module includes a fourth resistor R4 and a third capacitor C3. The fourth resistor R4 and the third capacitor C3 can effectively filter out the low-frequency signals in the voltage signal, thereby improving the quality of the voltage signal.

[0086] It can be seen that in this embodiment, a filtering module is set between the signal processing module 3 and the signal recognition module, and a high-pass filtering module is set between the antenna ANT1 and the first switching tube 1, which effectively filters out the clutter in the detection signal and the low-frequency signals in the voltage signal, and improves the signal quality.

[0087] The present invention also provides a method for detecting radio interference signals. Please refer to Figure 6 as shown in Figure 6 which is a flowchart of a method for detecting radio interference signals disclosed by the present invention.

[0088] The method for detecting radio interference signals is applied to the above-mentioned radio interference signal detection circuit. The radio interference signal detection circuit further includes a signal recognition module, and the signal recognition module is connected to the signal processing module 3. The method includes:

[0089] S11. Receive a voltage signal through the antenna ANT1;

[0090] S12. Control the first switching tube 1 to conduct when there is no voltage signal, so that the first switching tube 1 outputs a first low-level signal, and control the first switching tube 1 to turn off when the voltage signal is greater than a preset voltage threshold.

[0091] Specifically, when there is no radio interference signal, there is no input voltage signal, and the control end of the first switching tube 1 is a low-level signal; when there is a radio interference signal, if the voltage signal received by the antenna ANT1 is greater than the preset voltage threshold, the control end of the first switching tube 1 is a high-level signal. The preset voltage threshold is the conduction voltage of the first switching tube 1. The voltage at the control end of the first switching tube 1 is greater than the conduction voltage, so the first switching tube 1 turns off.

[0092] It should be noted that the antenna ANT1 generates different voltage signals that change periodically at different frequencies of radio interference signals.

[0093] S13. When the first switching transistor 1 is turned off, pull up the control terminal of the second switching transistor 2 to a first high-level signal through the first pull-up resistor RR1;

[0094] S14. Control the second switching transistor 2 to conduct based on the first low-level signal, so that the second switching transistor 2 outputs a second high-level signal, and control the second switching transistor 2 to turn off when the first switching transistor 1 is turned off.

[0095] Specifically, when the first switching transistor 1 outputs a first low-level signal, since the first end of the first switching transistor 1 is connected to the common end of the first end of the first pull-up resistor RR1 and the control terminal of the second switching transistor 2, the control terminal of the second switching transistor 2 is a first low-level signal, the first end of the second switching transistor 2 is the power supply voltage, and the voltage at the first end of the second switching transistor 2 is greater than the voltage at the control terminal of the second switching transistor 2, so the second switching transistor 2 conducts, and the second end of the second switching transistor 2 outputs the power supply voltage; when the first switching transistor 1 is turned off, since the first end of the first pull-up resistor RR1 is connected to the control terminal of the second switching transistor 2, the control terminal of the second switching transistor 2 is pulled up to a first high-level signal by the first pull-up resistor RR1, the first end of the second switching transistor 2 is the power supply voltage, and the voltage at the first end of the second switching transistor 2 and the voltage at the control terminal of the second switching transistor 2 are less than the conduction voltage of the second switching transistor 2, so the second switching transistor 2 turns off.

[0096] S15. Process the level signal at the first end of the signal processing module 3 through the signal processing module 3 and output a detection signal.

[0097] Specifically, when the second switching transistor 2 outputs the power supply voltage, the signal processing module 3 adjusts the frequency of the power supply voltage at the first end of the signal processing module 3 to output a smooth low-level detection signal; when the second switching transistor 2 is turned off, the first end of the signal processing module 3 is a low-level signal, and the signal processing module 3 adjusts the frequency of the low-level signal to output a smooth high-level detection signal.

[0098] S16. Identify the type of radio interference signal based on the waveform of the detection signal within a preset period through the signal identification module.

[0099] Specifically, if the waveform of the detection signal is a high-level signal for a first preset time within the preset period, the interference signal is a spark interference signal; if the waveform of the detection signal is a periodic level signal with a first frequency within the preset period, the interference signal is a strong static electricity interference signal; if the waveform of the detection signal is a periodic level signal with a second frequency within the preset period, the interference signal is a strong radio electromagnetic wave interference signal, where the first frequency is less than the second frequency.

[0100] In addition, after the signal recognition module identifies the type of the radio interference signal, the detection circuit of the radio interference signal can also record the radio interference event and remotely prompt through the collected radio interference event for subsequent processing.

[0101] It can be seen that this solution can convert the voltage signal into a detection signal through amplification and processing, and the signal recognition module can identify the type of the radio interference signal based on the waveform of the detection signal within a preset period, so as to realize the detection of the type of the radio interference signal.

[0102] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and for the relevant parts, reference can be made to the description in the method part.

[0103] It should also be noted that in this specification, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the said element.

[0104] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A detection circuit for a radio interference signal, characterized in that: It includes an antenna, a first switch tube, a first pull-up resistor, a second switch tube and a signal processing module; The antenna is connected to the control end of the first switch tube and is used to receive a voltage signal; The first end of the first switch tube is connected to the common end of the first end of the first pull-up resistor and the control end of the second switch tube, and the second end of the first switch tube is grounded, and is used to be turned on when there is no voltage signal to output a first low-level signal, and turned off when the voltage signal is greater than a preset voltage threshold; The second end of the first pull-up resistor is connected to the first end of the second switch tube, and the common end after the connection is connected to the power supply voltage, so as to pull up the control end of the second switch tube to a first high level signal when the first switch tube is turned off; The second end of the second switch tube is connected to the first end of the signal processing module, and is used to be turned on when the first switch tube outputs the first low-level signal to output the second high-level signal, and turned off when the first switch tube is turned off; The signal processing module is connected to the signal identification module, and is used to process the level signal of the first end of the signal processing module and output a detection signal to the signal identification module so that the signal identification module can detect the radio interference signal.

2. The radio interference signal detection circuit according to claim 1, characterized in that: The signal processing module includes a first capacitor, a first resistor, a third switch tube and a second pull-up resistor, and the third switch tube is a first triode or an NMOS tube; The first end of the first capacitor is connected to a common end of the second end of the second switch tube and the first end of the first resistor, and the common end after connection is the first end of the signal processing module. The second end of the first capacitor is grounded and is used to adjust the frequency of the level signal of the first end of the signal processing module together with the first resistor. The second end of the first resistor is connected to the control end of the third switch tube; The first end of the third switch tube is connected to the first end of the second pull-up resistor, and the common end after the connection serves as the second end of the signal processing module. The second end of the third switch tube is grounded and is used to be turned on when the level signal of the first end of the signal processing module is a high level signal to output a detection signal of a second low level signal, and turned off when the second switch tube is turned off.

3. The radio interference signal detection circuit according to claim 1, characterized in that: The first switch tube is a first PMOS tube, a gate of the first PMOS tube is connected to the antenna, a drain of the first PMOS tube is grounded, and a source of the first PMOS tube is connected to a common end of the first end of the first pull-up resistor and the control end of the second switch tube.

4. The radio interference signal detection circuit as claimed in claim 3, characterized in that: It also includes a second resistor, a first end of the second resistor is connected to the gate of the first PMOS tube and the common end of the antenna, and a second end of the second resistor is connected to the drain of the first PMOS tube for discharging to protect the first PMOS tube.

5. The radio interference signal detection circuit according to claim 1, characterized in that: The second switch tube is a second triode or a second PMOS tube.

6. The radio interference signal detection circuit according to claim 1, characterized in that: It also includes a current limiting resistor, a first end of the current limiting resistor is connected to a common end of the first end of the first switch tube and the first end of the first pull-up resistor, and a second end of the first current limiting resistor is connected to a control end of the second switch tube.

7. The radio interference signal detection circuit according to claim 1, characterized in that: It also includes a voltage regulator diode, a first end of the voltage regulator diode is connected to a common end of the antenna and the first end of the first switch tube, and a second end of the voltage regulator diode is grounded.

8. The radio interference signal detection circuit according to claim 1, characterized in that: It also includes a filtering module and a high-pass filtering module; The filtering module includes a third resistor and a second capacitor, the first end of the third resistor is connected to the common end of the second end of the signal processing module and the first end of the second capacitor, the second end of the third resistor is connected to the signal identification module, and the second end of the second capacitor is grounded; The high-pass filtering module includes a fourth resistor and a third capacitor, the first end of the fourth resistor is connected to the common end of the antenna and the first end of the third capacitor, the second end of the fourth resistor is grounded, and the second end of the third capacitor is connected to the control end of the first switch tube.

9. A method for detecting a radio interference signal, characterized in that: The detection circuit for a radio interference signal applied to any one of claims 1 to 8, wherein the detection circuit for a radio interference signal further comprises a signal identification module, wherein the signal identification module is connected to the signal processing module, and the method comprises: receiving a voltage signal via an antenna; When there is no voltage signal, the first switch tube is controlled to be turned on, so that the first switch tube outputs a first low-level signal; when the voltage signal is greater than a preset voltage threshold, the first switch tube is controlled to be turned off; When the first switch tube is turned off, the control end of the second switch tube is pulled up to a first high level signal through a first pull-up resistor; Based on the first low-level signal, the second switch tube is controlled to be turned on, so that the second switch tube outputs a second high-level signal, and the second switch tube is controlled to be turned off when the first switch tube is turned off; Processing the level signal of the first end of the signal processing module through the signal processing module, and outputting a detection signal; The signal identification module identifies the type of the radio interference signal based on the waveform of the detection signal within a preset period.

10. The method for detecting a radio interference signal according to claim 9, characterized in that: The signal identification module identifies the type of the interference signal based on the waveform of the detection signal within a preset period, including: If the waveform of the detection signal is a high-level signal for a first preset time within the preset period, then the interference signal is an electric spark interference signal; If the waveform of the detection signal is a periodic level signal of a first frequency within the preset period, then the interference signal is a strong electrostatic interference signal; If the waveform of the detection signal is a periodic level signal of a second frequency within the preset period, the interference signal is a strong radio electromagnetic wave interference signal, wherein the first frequency is less than the second frequency.

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