Automatic arc extinguishing leakage protection device

Abstract

The utility model provides an automatic arc extinguishing leakage protection device, and belongs to the technical field of arc detection. The automatic arc extinguishing leakage protection device comprises a temperature detection module, a plurality of ultrasonic detection modules, a switch module and a control module, the temperature detection module and the plurality of ultrasonic detection modules are connected with the control module, and the control module is connected with the switch module; the temperature detection module is configured to detect the temperature of the environment in the power distribution cabinet, and the plurality of ultrasonic detection modules are configured to locate the position where an electric arc occurs; the control module is configured to control the working state of the switch module according to the temperature collected by the temperature detection module and the positions located by the multiple ultrasonic detection modules. According to the invention, the method can respond immediately at the initial stage of the arc, greatly shortens the fault recognition and processing time, and reduces the accident risk.

Description

Technical Field

[0001] The present disclosure relates to the technical field of arc detection, and in particular to an automatic arc extinguishing leakage protection device. Background Art

[0002] Arcing is an abnormal discharge phenomenon in electrical equipment, often caused by insulation damage, poor contact or short circuit. It can generate extremely high temperatures, enough to ignite surrounding combustible materials and cause fires. Leakage is caused by the degradation of insulation performance of certain components, which may also increase the probability of arcing. When arcing occurs, it is often accompanied by high temperature, noise and strong radiation, posing a safety hazard to operators and the surrounding environment. Utility Model Content

[0003] The disclosed embodiment provides an automatic arc extinguishing leakage protection device to solve the problem that the system reacts slowly when an arc occurs, causing huge risks to the surrounding environment and technicians.

[0004] The embodiment of the present disclosure provides an automatic arc extinguishing leakage protection device, comprising:

[0005] A temperature detection module, multiple ultrasonic detection modules, a switch module and a control module;

[0006] The temperature detection module and the plurality of ultrasonic detection modules are connected to the control module, and the control module is connected to the switch module;

[0007] The temperature detection module is configured to detect the temperature of the environment in the power distribution cabinet, and the plurality of ultrasonic detection modules are configured to locate the position where the arc occurs;

[0008] The control module is configured to control the working state of the switch module according to the temperature collected by the temperature detection module and the positions of the plurality of ultrasonic detection modules.

[0009] In an exemplary embodiment of the present disclosure, the temperature detection module includes:

[0010] 555 timer, capacitor C1, capacitor C2, capacitor C3, resistor R1, resistor R2, resistor R3, sliding rheostat RP1, transistor Q1, photocoupler Q2, switch SW1, amplifier U4 and MOS tube U1;

[0011] The second end TRIG of the 555 timer is respectively connected to the sixth end THOLD, the seventh end DISCHG, the second end of the resistor R3, the moving end of the switch SW1, and the non-inverting input end of the amplifier U4; the fourth end PESET of the 555 timer is respectively connected to the eighth end VCC, the first end of the sliding rheostat RP1, the first end of the resistor R2, and the first end of the resistor R1; the fifth end CONT of the 555 timer is respectively connected to the second end of the resistor R2 and the collector of the transistor Q1; the first end of the 555 timer is respectively connected to the emitter of the transistor Q1, the second end of the capacitor C2, the second end of the capacitor C3, and GND;

[0012] The first end of the capacitor C1 is connected to the input signal Vin1, the base of the transistor Q1 is connected to the second end of the resistor R1 and the second end of the capacitor C1 respectively, the first fixed end of the switch SW1 is connected to the first end of the capacitor C2, the second fixed end of the switch SW1 is connected to the first end of the capacitor C3, and the first end of the resistor R3 is connected to the second end and the third end of the sliding rheostat RP1;

[0013] The inverting input terminal of the amplifier U4 is connected to the fourth terminal of the photoelectric coupler, the output terminal of the amplifier U4 is connected to the source of the MOS tube and the first terminal of the photoelectric coupler, and the fourth terminal of the photoelectric coupler is connected to GND.

[0014] In an exemplary embodiment of the present disclosure, the temperature detection module further includes:

[0015] Temperature acquisition unit, resistor R4, resistor R5, resistor R6, resistor R7, amplifier U2, amplifier U3;

[0016] The first end of the temperature acquisition unit is connected to the second end of the resistor R4, the second end of the temperature acquisition unit is connected to the drain of the MOS tube, the non-inverting input end of the amplifier U2 is connected to the first end of the resistor R4, and the output end of the amplifier U2 is connected to the inverting input end of the amplifier U2 and the second end of the resistor R5 respectively;

[0017] The non-inverting input terminal of the amplifier U3 is connected to the first end of the resistor R6, the inverting input terminal of the amplifier U3 is respectively connected to the first end of the resistor R5 and the second end of the resistor R7, the output terminal of the amplifier U3 is respectively connected to the first end of the resistor R7 and the output Vout1, and the second end of the resistor R6 is connected to GND.

[0018] In an exemplary embodiment of the present disclosure, each ultrasonic detection module includes:

[0019] A primary amplifier circuit, a filter circuit and a secondary amplifier circuit;

[0020] The primary amplifier circuit is connected to the filter circuit, the filter circuit is connected to the secondary amplifier circuit, and the secondary amplifier circuit is connected to the control module.

[0021] In an exemplary embodiment of the present disclosure, the first-stage amplification circuit includes:

[0022] Inductor L1, inductor L2, inductor L3, inductor L4, capacitor C4, capacitor C5, capacitor C6, diode D1, diode D2, transistor Q3;

[0023] The first end of the inductor L1 is connected to the input Vin2, the second end of the inductor L1 is connected to the first end of the capacitor C4, the second end of the capacitor C4 is respectively connected to the anode of the diode D2, the cathode of the diode D1, and the first end of the capacitor C5, and the cathode of the diode D2 and the anode of the diode D1 are both connected to GND;

[0024] The second end of the capacitor C5 is respectively connected to the second end of the inductor L2 and the base of the transistor Q3, the first end of the inductor L2 is respectively connected to the second end of the inductor L3, the collector of the transistor Q3, and the first end of the capacitor C6, the emitter of the transistor Q3 is connected to the first end of the inductor L4, the first end of the inductor L3 and the second end of the inductor L4 are both connected to GND, and the capacitor C6 is connected to the filter circuit.

[0025] In an exemplary embodiment of the present disclosure, the filtering circuit includes:

[0026] Inductor L5, inductor L6, inductor L7, capacitor C7, capacitor C8, amplifier U5;

[0027] The first end of the inductor L5 is connected to the first-stage amplifier circuit, the first end of the capacitor C7 is respectively connected to the second end of the inductor L5, the first end of the inductor L6, and the first end of the capacitor C8, the second end of the capacitor C7 is respectively connected to the second end of the inductor L7 and the inverting input end of the amplifier U5, and the second end of the inductor L6 is connected to GND;

[0028] The output end of the amplifier U5 is connected to the second end of the capacitor C8, the first end of the inductor L7, and the secondary amplifier circuit respectively.

[0029] In an exemplary embodiment of the present disclosure, the secondary amplifier circuit includes:

[0030] Capacitor C9, capacitor C10, resistor R8, resistor R9, resistor R10, transistor Q4, transistor Q5;

[0031] The first end of the capacitor C9 is connected to the filter circuit, and the second end of the capacitor C9 is respectively connected to the second end of the resistor R8, the first end of the resistor R9, the base of the transistor Q4, and the base of the transistor Q5;

[0032] The first end of the resistor R8 is respectively connected to the collector of the transistor Q4 and VDD, the emitter of the transistor Q4 is respectively connected to the emitter of the transistor Q5 and the first end of the capacitor C10, the collector of the transistor Q5 is respectively connected to the second end of the resistor R10 and GND, the second end of the capacitor C10 is respectively connected to the first end of the resistor R10 and the output Vout2, and the second end of R9 is connected to GND.

[0033] In an exemplary embodiment of the present disclosure, an automatic arc extinguishing leakage protection device further includes:

[0034] Early warning module;

[0035] The early warning module is connected with the control module.

[0036] The beneficial effects of an automatic arc extinguishing leakage protection device provided by the embodiment of the present disclosure are:

[0037] First, the temperature detection module monitors the ambient temperature in the power distribution cabinet in real time, and can detect abnormally high temperatures in time, effectively preventing electrical fires caused by overheating. Combined with the ultrasonic detection module's precise positioning of the arc location, the present disclosure can respond immediately at the initial stage of the arc, greatly shortening the time for fault identification and processing, and reducing the risk of accidents.

[0038] Secondly, the automatic monitoring and control mechanism disclosed in the present invention reduces the reliance on manual inspections and can automatically execute protection measures even during unmanned periods, greatly improving the stability and safety of the power system and reducing maintenance costs.

[0039] Finally, the design of the present invention is highly flexible, and the configuration of the ultrasonic detection module can be adjusted according to the specific layout and usage environment of the distribution cabinet or other large equipment. It is widely used in industrial, commercial and civil fields to meet diverse safety needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0041] Figure 1 It is a structural schematic diagram of an automatic arc extinguishing leakage protection device provided by an embodiment of the present disclosure;

[0042] Figure 2 It is a structural schematic diagram of an automatic arc extinguishing leakage protection device provided by another embodiment of the present disclosure;

[0043] Figure 3 is a schematic diagram of the structure of a temperature detection circuit provided by an embodiment of the present disclosure;

[0044] Figure 4 It is a structural schematic diagram of an ultrasonic detection module provided in one embodiment of the present disclosure. DETAILED DESCRIPTION

[0045] In order to enable people in the technical field to better understand the present solution, the technical solution in the embodiment of the present solution will be clearly described below in conjunction with the drawings in the embodiment of the present solution. Obviously, the described embodiment is an embodiment of a part of the present solution, not all of the embodiments. Based on the embodiments in the present solution, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present solution.

[0046] The term "including" and any other variations in the specification and claims of this solution and the above drawings mean "including but not limited to", and is intended to cover non-exclusive inclusions and is not limited to the examples listed in the text. In addition, the terms "first" and "second" are used to distinguish different objects, not to describe a specific order.

[0047] The following is a detailed description of the implementation of the present disclosure in conjunction with the specific drawings:

[0048] Figure 1 This is a schematic diagram of the structure of an automatic arc extinguishing leakage protection device provided by an embodiment of the present disclosure. Figure 1 , the automatic arc extinguishing leakage protection device comprises:

[0049] A temperature detection module 11, a plurality of ultrasonic detection modules 12, a switch module 14 and a control module 13;

[0050] The temperature detection module 11 and the plurality of ultrasonic detection modules 12 are connected to the control module 13, and the control module 13 is connected to the switch module 14;

[0051] The temperature detection module 11 is configured to detect the temperature of the environment in the power distribution cabinet, and the plurality of ultrasonic detection modules 12 are configured to locate the position where the arc occurs;

[0052] The control module 13 is configured to control the working state of the switch module 14 according to the temperature collected by the temperature detection module 11 and the positions of the plurality of ultrasonic detection modules 12 .

[0053] In this embodiment, the temperature detection module 11 can detect the temperature in the power distribution cabinet in real time, because abnormal temperature is often a precursor to electrical faults, such as line overload or local short circuit, which may cause arcing.

[0054] Multiple ultrasonic detection modules 12 are distributed in different locations of the power distribution cabinet. They use ultrasonic technology to detect specific high-frequency sound wave signals generated by arcs. Ultrasonic waves are generated when arcs are discharged. These modules can accurately locate the area where the arc occurs based on the intensity and arrival time difference of the received ultrasonic signal. This non-contact detection method helps to find potential arc fault points in a timely manner.

[0055] The control module 13 can receive data from the temperature detection module 11 and all the ultrasonic detection modules 12. By analyzing these data, the control module 13 can determine whether an abnormal situation has occurred, such as the temperature exceeds a preset safety threshold, or the ultrasonic wave detects a signal of a specific pattern indicating the existence of an arc. Once the control module 13 determines that there is a risk of leakage or arc, it immediately sends an instruction to the switch module 14. The switch module 14 may include a circuit breaker or other form of switching device for quickly cutting off the faulty circuit, thereby preventing the arc from further developing and effectively curbing the occurrence of accidents such as electrical fires.

[0056] From the above, we can conclude that:

[0057] First, the temperature detection module 11 monitors the ambient temperature in the power distribution cabinet in real time, and can detect abnormally high temperatures in time, effectively preventing electrical fires caused by overheating. Combined with the accurate positioning of the arc position by the ultrasonic detection module 12, the present disclosure can respond immediately at the initial stage of the arc, greatly shortening the time for fault identification and processing, and reducing the risk of accidents.

[0058] Secondly, the automatic monitoring and control mechanism disclosed in the present invention reduces the reliance on manual inspections and can automatically execute protection measures even during unmanned periods, greatly improving the stability and safety of the power system and reducing maintenance costs.

[0059] Finally, the design of the present invention is highly flexible, and the configuration of the ultrasonic detection module 12 can be adjusted according to the specific layout and use environment of the distribution cabinet or other large equipment. It is widely used in industrial, commercial and civil fields to meet diverse safety needs.

[0060] In one embodiment of the present disclosure, reference Figure 2 and Figure 3 , the temperature detection module 11 includes:

[0061] 555 timer, capacitor C1, capacitor C2, capacitor C3, resistor R1, resistor R2, resistor R3, sliding rheostat RP1, transistor Q1, photocoupler Q2, switch SW1, amplifier U4 and MOS tube U1;

[0062] The second terminal TRIG of the 555 timer is respectively connected to the sixth terminal THOLD, the seventh terminal DISCHG, the second end of the resistor R3, the moving end of the switch SW1, and the non-inverting input terminal of the amplifier U4; the fourth terminal PESET of the 555 timer is respectively connected to the eighth terminal VCC, the first end of the sliding rheostat RP1, the first end of the resistor R2, and the first end of the resistor R1; the fifth terminal CONT of the 555 timer is respectively connected to the second end of the resistor R2 and the collector of the transistor Q1; the first end of the 555 timer is respectively connected to the emitter of the transistor Q1, the second end of the capacitor C2, the second end of the capacitor C3, and GND;

[0063] The first end of the capacitor C1 is connected to the input signal Vin1, the base of the transistor Q1 is connected to the second end of the resistor R1 and the second end of the capacitor C1 respectively, the first fixed end of the switch SW1 is connected to the first end of the capacitor C2, the second fixed end of the switch SW1 is connected to the first end of the capacitor C3, and the first end of the resistor R3 is connected to the second end and the third end of the sliding resistor RP1;

[0064] The inverting input terminal of the amplifier U4 is connected to the fourth terminal of the photoelectric coupler, the output terminal of the amplifier U4 is connected to the source of the MOS tube and the first terminal of the photoelectric coupler, and the fourth terminal of the photoelectric coupler is connected to GND.

[0065] In this embodiment, the temperature detection module 11 constructs a temperature sensing and signal processing circuit with the 555 timer as the core. The input signal Vin1 represents the signal in the circuit. The capacitor C1 and the resistor R1 form an RC network, which affects the trigger level of the 555 timer, thereby converting the temperature change into a time or frequency signal. The sliding rheostat RP1 is used to adjust the reference voltage, affect the timer threshold, and realize the setting of the temperature threshold. The transistor Q1 is connected to the control terminal CONT of the 555 timer to further adjust the working state of the timer.

[0066] The photocoupler Q2 isolates the input and output circuits and enhances the circuit's anti-interference ability. The amplifier U4 amplifies the signal output by the photocoupler to enhance the signal strength, ensuring that the MOS tube U1 can accurately respond to the control signal and realize the switch control of the external circuit, such as starting the cooling fan or alarming when the temperature exceeds the preset value. The switch SW1 is used for mode switching or calibration of the circuit. The entire module works together to monitor the ambient temperature and can trigger the preset protection or alarm action at a specific temperature.

[0067] It can be concluded from the above that this embodiment realizes the accurate conversion and processing of temperature signals. The circuit can sensitively respond to temperature changes and realize temperature monitoring by adjusting the threshold value of the sliding rheostat. The photocoupler ensures the electrical isolation of signal transmission and enhances the stability and safety of the system. The integration of amplifier U4 and MOS tube U1 improves the driving ability of the control signal, which can effectively trigger the subsequent protection or alarm mechanism, and has a significant early warning and protection effect on preventing overheating and fire of electrical equipment.

[0068] In one embodiment of the present disclosure, reference Figure 2 and Figure 3 , the temperature detection module 11 also includes:

[0069] Temperature acquisition unit, resistor R4, resistor R5, resistor R6, resistor R7, amplifier U2, amplifier U3;

[0070] The first end of the temperature acquisition unit is connected to the second end of the resistor R4, the second end of the temperature acquisition unit is connected to the drain of the MOS tube, the non-inverting input end of the amplifier U2 is connected to the first end of the resistor R4, and the output end of the amplifier U2 is connected to the inverting input end of the amplifier U2 and the second end of the resistor R5 respectively;

[0071] The non-inverting input terminal of the amplifier U3 is connected to the first end of the resistor R6, the inverting input terminal of the amplifier U3 is respectively connected to the first end of the resistor R5 and the second end of the resistor R7, the output terminal of the amplifier U3 is respectively connected to the first end of the resistor R7 and the output Vout1, and the second end of the resistor R6 is connected to GND.

[0072] In this embodiment, the temperature acquisition unit directly or indirectly (such as through a thermistor) senses the temperature of the environment or a specific point and converts it into an electrical signal. The electrical signal forms a voltage divider circuit with resistor R4, wherein the first end is connected to the temperature acquisition unit, the second end is connected to the drain of the MOS tube, and the first end of resistor R4 is connected to the positive input end of amplifier U2. This design enables temperature changes to be converted into voltage changes that are easy to handle. Amplifier U2 is a voltage follower used for impedance matching to reduce the impact of output components on the voltage in the circuit.

[0073] The amplifier U3 is used as the first stage amplifier circuit 201, and its non-phase input terminal is indirectly connected to the pre-stage amplified signal through the resistor R6, and its inverting input terminal is connected to the ground through the voltage divider circuit composed of the resistors R5 and R7 to form a stable reference voltage. This stage of amplification not only further enhances the signal, but also filters the signal through the resistor network to improve the purity of the signal, and finally outputs it to Vout1, which is connected to the control module 13 for further analysis and processing of the temperature signal.

[0074] From the above, it can be concluded that this embodiment improves the accuracy of temperature detection and the quality of signal processing by adding a temperature acquisition unit and a first-stage amplifier design, so that the output voltage signal Vout1 more accurately reflects the temperature change, and optimizes the anti-interference ability and signal stability through circuit design, which is suitable for scenarios requiring high-precision temperature monitoring.

[0075] In one embodiment of the present disclosure, reference Figure 2 , each ultrasonic detection module 12 includes:

[0076] A first-stage amplifier circuit 201, a filter circuit 202 and a second-stage amplifier circuit 203;

[0077] The primary amplifier circuit 201 is connected to the filter circuit 202 , the filter circuit 202 is connected to the secondary amplifier circuit 203 , and the secondary amplifier circuit 203 is connected to the control module 13 .

[0078] In this embodiment, the ultrasonic detection module 12 is mainly composed of a primary amplifier circuit 201, a filter circuit 202, and a secondary amplifier circuit 203. The ultrasonic signal is initially amplified by the independent primary amplifier circuit 201, filtered to remove interference signals, and finally amplified by the secondary amplifier circuit 203 to be converted into a voltage range that can be analyzed and processed by the control module 13.

[0079] The ultrasonic detection module 12 first receives ultrasonic signals from the surrounding environment. These signals may be generated by specific events such as arc discharge. The characteristics of the ultrasonic wavelength enable it to better penetrate obstacles such as electrical cabinets, which is suitable for non-contact arc position positioning. The received ultrasonic signals are usually very weak. The first-level amplifier circuit 201 first amplifies these weak electrical signals to reach a level that can be further processed. This level of amplification is the basis and the key, which ensures that the subsequent processing links can identify and use these signals. The filtered signal enters the second-level amplifier circuit 203 for a second amplification process. This level of amplification can further increase the strength of the signal, ensuring that the signal is not distorted during transmission to the control module 13, and is strong enough to drive subsequent processing and analysis. The signal after two-stage amplification and filtering is finally transmitted to the control module 13. The control module 13 receives the amplified and purified ultrasonic signal. Based on these signals, the control module 13 can accurately calculate the location of the arc and make corresponding control decisions accordingly, such as triggering the switch module 14 to cut off the power supply to prevent safety accidents caused by the arc.

[0080] It can be concluded from the above that the ultrasonic detection module 12 effectively enhances the detection capability of ultrasonic signals, improves the accuracy of arc positioning and the response speed of the system.

[0081] In one embodiment of the present disclosure, reference Figure 4 , the first-stage amplifier circuit 201 comprises:

[0082] Inductor L1, inductor L2, inductor L3, inductor L4, capacitor C4, capacitor C5, capacitor C6, diode D1, diode D2, transistor Q3;

[0083] The first end of the inductor L1 is connected to the input Vin2, the second end of the inductor L1 is connected to the first end of the capacitor C4, the second end of the capacitor C4 is respectively connected to the anode of the diode D2, the cathode of the diode D1, and the first end of the capacitor C5, and the cathode of the diode D2 and the anode of the diode D1 are both connected to GND;

[0084] The second end of capacitor C5 is respectively connected to the second end of inductor L2 and the base of transistor Q3, the first end of inductor L2 is respectively connected to the second end of inductor L3, the collector of transistor Q3 and the first end of capacitor C6, the emitter of transistor Q3 is connected to the first end of inductor L4, the first end of inductor L3 and the second end of inductor L4 are both connected to GND, and capacitor C6 is connected to filter circuit 202.

[0085] In this embodiment, the ultrasonic signal enters the circuit through the inductor L1, which plays a certain filtering role here, blocking high-frequency noise while allowing the ultrasonic signal of lower frequency to pass through. The signal then forms a low-pass filter with the capacitor C4 to further filter out high-frequency interference. Diodes D1 and D2 form a half-wave rectifier to ensure that the signal only passes in a specific direction, protecting the subsequent amplification circuit from damage by reverse voltage, and performing preliminary processing on the signal.

[0086] The signal enters the base of transistor Q3 through capacitor C5. Transistor Q3 (usually NPN type) is used as an amplifier element here, and its base signal controls the current between the collector and the emitter to achieve voltage amplification of the input signal. Inductors L2 and L3 form an LC matching network to optimize signal transmission, while inductor L4 may act as a choke to reduce high-frequency signal feedback. The amplified signal is output to the filter circuit 202 through capacitor C6. Capacitor C6 acts as a coupling capacitor here, blocking direct current and passing alternating current, ensuring that only alternating current signals enter the next link, and at the same time plays a certain decoupling and filtering role.

[0087] It can be concluded from the above that the design of the first-stage amplifier circuit 201 not only effectively enhances the ultrasonic signal, but also improves the anti-interference ability of the device, and is a key and efficient part of the entire ultrasonic detection module 12.

[0088] In one embodiment of the present disclosure, reference Figure 4 , the filter circuit 202 comprises:

[0089] Inductor L5, inductor L6, inductor L7, capacitor C7, capacitor C8, amplifier U5;

[0090] The first end of the inductor L5 is connected to the first-stage amplifier circuit 201, the first end of the capacitor C7 is respectively connected to the second end of the inductor L5, the first end of the inductor L6, and the first end of the capacitor C8, the second end of the capacitor C7 is respectively connected to the second end of the inductor L7 and the inverting input end of the amplifier U5, and the second end of the inductor L6 is connected to GND;

[0091] The output end of the amplifier U5 is connected to the second end of the capacitor C8 , the first end of the inductor L7 , and the secondary amplifier circuit 203 , respectively.

[0092] In this embodiment, the signal output by the first-stage amplifier circuit 201 first enters the inductor L5, which acts as a high-frequency filter, allowing the signal to pass while suppressing high-frequency noise. The signal then forms a low-pass filter network with the capacitor C7 to further filter out high-frequency interference and only allow low-frequency signals to pass, which helps to improve the purity of the signal. The signal continues to pass through the inductor L6 (which may be used as impedance matching or high-frequency filtering) and forms another level of filtering with the capacitor C8, and then enters the inverting input terminal of the operational amplifier U5. The operational amplifier U5 not only amplifies the input signal, but also provides high input impedance and low output impedance to ensure efficient transmission and processing of the signal. The amplified signal is further filtered by the capacitor C8 and the inductor L7, and then sent to the second-stage amplifier circuit 203. It can be concluded from the above that the filter circuit 202 can effectively filter out noise signals and some low-frequency signals in the signal, thereby enhancing the anti-interference ability of the device.

[0093] In one embodiment of the present disclosure, reference Figure 4 , the secondary amplifier circuit 203 comprises:

[0094] Capacitor C9, capacitor C10, resistor R8, resistor R9, resistor R10, transistor Q4, transistor Q5;

[0095] The first end of the capacitor C9 is connected to the filter circuit 202, and the second end of the capacitor C9 is respectively connected to the second end of the resistor R8, the first end of the resistor R9, the base of the transistor Q4, and the base of the transistor Q5;

[0096] The first end of the resistor R8 is connected to the collector of the transistor Q4 and VDD respectively, the emitter of the transistor Q4 is connected to the emitter of the transistor Q5 and the first end of the capacitor C10 respectively, the collector of the transistor Q5 is connected to the second end of the resistor R10 and GND respectively, the second end of the capacitor C10 is connected to the first end of the resistor R10 and the output Vout2 respectively, and the second end of R9 is connected to GND.

[0097] In this embodiment, the signal first enters the filter circuit 202 through the capacitor C9, which acts as a coupling capacitor to isolate the DC component and only allow the AC signal to pass through. The signal is then divided to the bases of the two transistors Q4 and Q5, which (usually in a complementary symmetrical configuration, such as NPN and PNP types) form a Darlington amplifier structure, which significantly enhances the signal amplification effect.

[0098] Resistors R8, R9, and R10 are used to set the bias point and gain control to ensure that the transistor works in the amplification area, where R8 is the collector load resistor of Q4, connected to VDD to provide collector current; R9 and R10 set the base current of Q4 and Q5 respectively, affecting the overall gain. The emitter of transistor Q4 is connected to that of Q5, and the shared capacitor C10 acts as an output coupling capacitor, which can remove the DC component and ensure that the pure AC signal is output to Vout2.

[0099] From the above, it can be concluded that this circuit design not only amplifies the signal through the cascade amplification of dual triodes, but also improves the input resistance and output driving capability of the circuit, so that the output signal Vout2 has a higher amplitude and good stability, which is suitable for further processing and analysis of subsequent circuits or systems.

[0100] In one embodiment of the present disclosure, reference Figure 2 , an automatic arc extinguishing leakage protection device also includes:

[0101] Early warning module 15;

[0102] The early warning module 15 is connected to the control module 13 .

[0103] In this embodiment, the control module 13 analyzes and determines whether there is a risk of leakage, overheating or arcing based on the real-time data provided by the temperature detection module 11 and the ultrasonic detection module 12. Once an abnormal situation is confirmed, the control module 13 immediately processes this information. Based on the analysis results, the control module 13 sends an instruction to the early warning module 15. After receiving the instruction, the early warning module 15 generates a corresponding early warning signal according to the preset early warning logic. This may include sound and light alarms, SMS notifications, APP push, etc., to quickly send alarm information to management personnel or maintenance personnel.

[0104] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. An automatic arc extinguishing leakage protection device, characterized in that: include: A temperature detection module, multiple ultrasonic detection modules, a switch module and a control module; The temperature detection module and the plurality of ultrasonic detection modules are connected to the control module, and the control module is connected to the switch module; The temperature detection module is configured to detect the temperature of the environment in the power distribution cabinet, and the plurality of ultrasonic detection modules are configured to locate the position where the arc occurs; The control module is configured to control the working state of the switch module according to the temperature collected by the temperature detection module and the positions of the plurality of ultrasonic detection modules.

2. An automatic arc extinguishing leakage protection device as claimed in claim 1, characterized in that: The temperature detection module comprises: 555 timer, capacitor C1, capacitor C2, capacitor C3, resistor R1, resistor R2, resistor R3, sliding rheostat RP1, transistor Q1, photocoupler Q2, switch SW1, amplifier U4 and MOS tube U1; The second end TRIG of the 555 timer is respectively connected to the sixth end THOLD, the seventh end DISCHG, the second end of the resistor R3, the moving end of the switch SW1, and the non-inverting input end of the amplifier U4; the fourth end PESET of the 555 timer is respectively connected to the eighth end VCC, the first end of the sliding rheostat RP1, the first end of the resistor R2, and the first end of the resistor R1; the fifth end CONT of the 555 timer is respectively connected to the second end of the resistor R2 and the collector of the transistor Q1; the first end of the 555 timer is respectively connected to the emitter of the transistor Q1, the second end of the capacitor C2, the second end of the capacitor C3, and GND; The first end of the capacitor C1 is connected to the input signal Vin1, the base of the transistor Q1 is connected to the second end of the resistor R1 and the second end of the capacitor C1 respectively, the first fixed end of the switch SW1 is connected to the first end of the capacitor C2, the second fixed end of the switch SW1 is connected to the first end of the capacitor C3, and the first end of the resistor R3 is connected to the second end and the third end of the sliding rheostat RP1; The inverting input terminal of the amplifier U4 is connected to the fourth terminal of the photoelectric coupler, the output terminal of the amplifier U4 is connected to the source of the MOS tube and the first terminal of the photoelectric coupler, and the fourth terminal of the photoelectric coupler is connected to GND.

3. An automatic arc extinguishing leakage protection device as claimed in claim 2, characterized in that: The temperature detection module also includes: Temperature acquisition unit, resistor R4, resistor R5, resistor R6, resistor R7, amplifier U2, amplifier U3; The first end of the temperature acquisition unit is connected to the second end of the resistor R4, the second end of the temperature acquisition unit is connected to the drain of the MOS tube, the non-inverting input end of the amplifier U2 is connected to the first end of the resistor R4, and the output end of the amplifier U2 is connected to the inverting input end of the amplifier U2 and the second end of the resistor R5 respectively; The non-inverting input terminal of the amplifier U3 is connected to the first end of the resistor R6, the inverting input terminal of the amplifier U3 is respectively connected to the first end of the resistor R5 and the second end of the resistor R7, the output terminal of the amplifier U3 is respectively connected to the first end of the resistor R7 and the output Vout1, and the second end of the resistor R6 is connected to GND.

4. The automatic arc extinguishing leakage protection device according to claim 1, characterized in that: Each ultrasonic detection module includes: A primary amplifier circuit, a filter circuit and a secondary amplifier circuit; The primary amplifier circuit is connected to the filter circuit, the filter circuit is connected to the secondary amplifier circuit, and the secondary amplifier circuit is connected to the control module.

5. An automatic arc extinguishing leakage protection device as claimed in claim 4, characterized in that: The first-stage amplifier circuit comprises: Inductor L1, inductor L2, inductor L3, inductor L4, capacitor C4, capacitor C5, capacitor C6, diode D1, diode D2, transistor Q3; The first end of the inductor L1 is connected to the input Vin2, the second end of the inductor L1 is connected to the first end of the capacitor C4, the second end of the capacitor C4 is respectively connected to the anode of the diode D2, the cathode of the diode D1, and the first end of the capacitor C5, and the cathode of the diode D2 and the anode of the diode D1 are both connected to GND; The second end of the capacitor C5 is respectively connected to the second end of the inductor L2 and the base of the transistor Q3, the first end of the inductor L2 is respectively connected to the second end of the inductor L3, the collector of the transistor Q3, and the first end of the capacitor C6, the emitter of the transistor Q3 is connected to the first end of the inductor L4, the first end of the inductor L3 and the second end of the inductor L4 are both connected to GND, and the capacitor C6 is connected to the filter circuit.

6. An automatic arc extinguishing leakage protection device as claimed in claim 4, characterized in that: The filtering circuit comprises: Inductor L5, inductor L6, inductor L7, capacitor C7, capacitor C8, amplifier U5; The first end of the inductor L5 is connected to the first-stage amplifier circuit, the first end of the capacitor C7 is respectively connected to the second end of the inductor L5, the first end of the inductor L6, and the first end of the capacitor C8, the second end of the capacitor C7 is respectively connected to the second end of the inductor L7 and the inverting input end of the amplifier U5, and the second end of the inductor L6 is connected to GND; The output end of the amplifier U5 is connected to the second end of the capacitor C8, the first end of the inductor L7, and the secondary amplifier circuit respectively.

7. An automatic arc extinguishing leakage protection device as claimed in claim 4, characterized in that: The secondary amplifier circuit comprises: Capacitor C9, capacitor C10, resistor R8, resistor R9, resistor R10, transistor Q4, transistor Q5; The first end of the capacitor C9 is connected to the filter circuit, and the second end of the capacitor C9 is respectively connected to the second end of the resistor R8, the first end of the resistor R9, the base of the transistor Q4, and the base of the transistor Q5; The first end of the resistor R8 is respectively connected to the collector of the transistor Q4 and VDD, the emitter of the transistor Q4 is respectively connected to the emitter of the transistor Q5 and the first end of the capacitor C10, the collector of the transistor Q5 is respectively connected to the second end of the resistor R10 and GND, the second end of the capacitor C10 is respectively connected to the first end of the resistor R10 and the output Vout2, and the second end of R9 is connected to GND.

8. The automatic arc extinguishing leakage protection device according to claim 1, characterized in that: Also includes: Early warning module; The early warning module is connected with the control module.

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