Circuit protection device, circuit protection method and electrical apparatus

Abstract

The application provides a circuit protection device, a circuit protection method and an electrical equipment, and relates to the technical field of circuit protection. The device comprises a signal processing module, a driving module and a cutting module. One end of the signal processing module is connected with a main circuit, and the other end of the signal processing module is connected with the driving module. The driving module comprises a pre-charging capacitor and a magnetic driving structure. The pre-charging capacitor and the magnetic driving structure are connected in series to form a loop. The cutting module is located between the magnetic driving structure and the main circuit. The signal processing module is used for controlling the pre-charging capacitor in the driving module to charge when the current of the main circuit is normal, and controlling the pre-charging capacitor in the driving module to discharge when a fault current of the main circuit is detected, so as to generate an electromagnetic repulsive force from the magnetic driving structure to the cutting module. The cutting module is used for moving towards the main circuit under the drive of the electromagnetic repulsive force and cutting off the main circuit. The implementation of the scheme does not depend on a pyrotechnic device, and can improve the usability of the circuit protection device while realizing fast circuit protection.

Description

Technical Field

[0001] This application relates to the field of circuit protection technology, and more specifically, to a circuit protection device, a circuit protection method, and an electrical appliance. Background Technology

[0002] In power systems, circuit protection devices can quickly disconnect faulty parts, limit the scope of the fault's impact, ensure the normal operation of other parts of the power system, and improve the reliability of power supply.

[0003] Currently, most circuit protection devices include pyrotechnics. After a fault signal is detected, an external trigger signal is used to trigger the pyrotechnics to explode and generate high voltage, which drives the cut-off module to cut off the main circuit and achieve circuit protection.

[0004] However, pyrotechnics are unique and their production and acquisition are difficult, which may affect the normal research and development and production of circuit protection devices. Summary of the Invention

[0005] The purpose of this application is to address the shortcomings of the prior art by providing a circuit protection device, circuit protection method, and electrical equipment, so as to achieve rapid circuit protection while improving the usability of the circuit protection device.

[0006] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0007] In a first aspect, embodiments of this application provide a circuit protection device, including: a signal processing module, a driving module, and a cut-off module;

[0008] One end of the signal processing module is connected to the main circuit, and the other end of the signal processing module is connected to the drive module;

[0009] The drive module includes a pre-charge capacitor and a magnetic drive structure; the pre-charge capacitor and the magnetic drive structure are connected in series to form a circuit.

[0010] The cutting module is located between the magnetic drive structure and the main circuit;

[0011] The signal processing module is used to control the pre-charge capacitor in the drive module to charge when the main circuit current is normal, and to control the pre-charge capacitor in the drive module to discharge when a fault current in the main circuit is detected, so as to generate an electromagnetic repulsion force to the cut-off module through the magnetic drive structure.

[0012] The cutting-off module is used to move toward the main circuit under the drive of the electromagnetic repulsion force and cut off the main circuit.

[0013] Optionally, the driving module further includes: a resistor and a diode;

[0014] One end of the resistor is connected to one end of the pre-charged capacitor, and the other end of the resistor is connected to the positive terminal of the diode;

[0015] The negative terminal of the diode is connected to one end of the magnetic drive structure;

[0016] The other end of the magnetic drive structure is connected to the other end of the pre-charged capacitor.

[0017] Optionally, the signal processing module includes a first switch and a second switch;

[0018] One end of the first switch is connected to the positive terminal of the main circuit, and the other end of the first switch is connected to one end of the resistor;

[0019] One end of the second switch is connected to one end of the resistor, and the other end of the second switch is connected to the positive terminal of the diode.

[0020] Optionally, the cutting module includes a repulsion disk and a cutting piston; the magnetic drive structure includes a magnetic drive coil.

[0021] One side of the repulsion disk faces the magnetic drive coil, and the other side of the repulsion disk faces the main circuit; the cut-off piston is connected to the side of the repulsion disk facing the main circuit.

[0022] Optionally, the main circuit includes a main circuit copper busbar; the main circuit copper busbar is provided with a weak point;

[0023] The cutting piston is positioned opposite to the weak point.

[0024] Optionally, the magnetic drive structure further includes a buffer section; the buffer section is disposed at the bottom of the magnetic drive coil;

[0025] The buffer section is used to adjust the setting distance between the magnetic drive coil and the repulsion disk.

[0026] Optionally, the magnetic drive structure further includes: a drive shaft;

[0027] The drive shaft is located on the axis between the repulsion disk and the magnetic drive coil.

[0028] Optionally, the magnetic drive structure further includes: a first Hector and a second Hector; the first Hector and the second Hector are in contact with each other to form a closed magnetic circuit;

[0029] The first ferrite is disposed between the magnetic drive coil and the repulsion disk;

[0030] The second ferrite is disposed between the magnetic drive coil and the buffer section.

[0031] Secondly, embodiments of this application also provide a circuit protection method, applied to a signal processing module in any of the circuit protection devices described in the first aspect above, the method comprising:

[0032] Detect the current in the main circuit;

[0033] Based on the current, determine whether a current fault exists.

[0034] If present, the pre-charge capacitor is controlled to discharge, thereby generating an electromagnetic repulsion force on the cut-off module through the magnetic drive structure.

[0035] Thirdly, embodiments of this application provide an electrical device including any of the circuit protection devices described in the first aspect above.

[0036] The beneficial effects of this application are:

[0037] This application provides a circuit protection device, a circuit protection method, and an electrical appliance. The circuit protection device includes a signal processing module, a drive module, and a disconnection module. One end of the signal processing module is connected to the main circuit, and the other end is connected to the drive module. The drive module includes a pre-charge capacitor and a magnetic drive structure. The pre-charge capacitor and the magnetic drive structure are connected in series to form a circuit. The disconnection module is located between the magnetic drive structure and the main circuit. The signal processing module controls the pre-charge capacitor in the drive module to charge when the main circuit current is normal, and controls the pre-charge capacitor in the drive module to discharge when a fault current in the main circuit is detected, so as to generate an electromagnetic repulsion force towards the disconnection module through the magnetic drive structure. The disconnection module is used to move towards the main circuit and disconnect the main circuit under the drive of the electromagnetic repulsion force. This solution uses a capacitor and a magnetic drive structure to form the drive module. The current generated by the capacitor discharge causes the magnetic drive structure to generate an electromagnetic repulsion force, thereby controlling the disconnection module to perform circuit disconnection operation based on the electromagnetic repulsion force. This makes the implementation of the drive module independent of pyrotechnics, and improves the usability of the circuit protection device while achieving rapid circuit protection.

[0038] In addition, by setting a weak point on the main circuit copper busbar, and the location of the weak point corresponds to the tip of the cutting piston in the cutting module, the cutting module can quickly cut off the main circuit, thus achieving the effect of rapid circuit protection.

[0039] By incorporating a buffer section in the magnetic drive structure, the distance between the magnetic drive coil and the repulsion disk can be adjusted, thereby calibrating the force exerted by the magnetic drive coil on the repulsion disk to match the cutting force required by the main circuit copper busbars of different current specifications.

[0040] The circuit protection method includes: detecting the current in the main circuit; determining whether a current fault exists based on the current; and if so, controlling the pre-charge capacitor to discharge, thereby generating an electromagnetic repulsion force on the disconnection module through the magnetic drive structure. In the event of a fault current, this method controls the pre-charge capacitor to discharge, enabling the magnetic drive structure to generate an electromagnetic repulsion force, which in turn drives the disconnection module to quickly disconnect the main circuit. This improves the efficiency of circuit protection. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 A schematic diagram of a circuit protection device provided in an embodiment of this application;

[0043] Figure 2 A schematic diagram of another circuit protection device provided in the embodiments of this application;

[0044] Figure 3 A schematic diagram of yet another circuit protection device provided in the embodiments of this application;

[0045] Figure 4 A schematic diagram of another circuit protection device provided in the embodiments of this application;

[0046] Figure 5 A schematic diagram of a cutting module and magnetic drive structure provided in an embodiment of this application;

[0047] Figure 6 A schematic diagram of a main circuit provided in an embodiment of this application;

[0048] Figure 7 A schematic diagram illustrating the arrangement of the cut-off piston in the main circuit and cut-off module, provided in an embodiment of this application;

[0049] Figure 8 A schematic diagram of another cutting module and magnetic drive structure provided in an embodiment of this application;

[0050] Figure 9 A schematic flowchart illustrating a circuit protection method provided in an embodiment of this application;

[0051] Figure 10 This is a schematic diagram of an electrical device provided in an embodiment of this application. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the accompanying drawings in this application are for illustrative and descriptive purposes only and are not intended to limit the scope of protection of this application. Furthermore, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of this application. It should be understood that the operations in the flowcharts may not be implemented in sequence, and steps without logical contextual relationships may be reversed or implemented simultaneously. In addition, those skilled in the art, guided by the content of this application, may add one or more other operations to the flowcharts, or remove one or more operations from the flowcharts.

[0053] Furthermore, the described embodiments are merely some, not all, of the embodiments of this application. The components of the embodiments of this application described and illustrated herein can typically be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0054] It should be noted that the term "comprising" will be used in the embodiments of this application to indicate the presence of the features declared thereafter, but does not exclude the addition of other features.

[0055] In a power system, if a fault occurs in a local circuit without effective protection, the fault may spread to other parts, leading to a large-scale power outage. Circuit protection devices can quickly isolate the faulty section, limit the impact of the fault, ensure the normal operation of other parts of the power system, and improve the reliability of power supply. Circuit protection devices can detect and isolate faulty circuits in a timely manner, reducing system downtime caused by faults, improving the overall operating efficiency of the power system, and enabling more efficient use of power resources.

[0056] In existing circuit protection devices, one end of the cut-off module faces the pyrotechnic device, and the other end faces the main circuit. After the external excitation source detects the fault signal, it triggers the pyrotechnic device in the chamber to explode and generate high pressure, which drives the cut-off module to move towards the main circuit, cuts off the copper busbar of the main circuit, and realizes circuit protection.

[0057] Pyrotechnic devices are components that can generate energy output through combustion or explosion. Due to the special nature of pyrotechnic devices, their use and management are strictly limited to ensure safety and reliability. Based on this characteristic, the production and use of existing circuit protection devices are subject to certain restrictions.

[0058] Based on this, the circuit protection device provided in this solution relies on electromagnetic force to quickly disconnect the faulty circuit, avoiding the use of pyrotechnics and improving the usability of the circuit protection device.

[0059] Figure 1 A schematic diagram of a circuit protection device provided in an embodiment of this application is shown below. Figure 1 As shown, the circuit protection device includes: a signal processing module, a drive module, and a cut-off module.

[0060] One end of the signal processing module is connected to the main circuit, and the other end of the signal processing module is connected to the drive module; the drive module includes a pre-charge capacitor and a magnetic drive structure; the pre-charge capacitor and the magnetic drive structure are connected in series to form a circuit; the cut-off module is located between the magnetic drive structure and the main circuit.

[0061] The signal processing module is used to control the pre-charge capacitor in the drive module to charge when the main circuit current is normal, and to control the pre-charge capacitor in the drive module to discharge when a fault current in the main circuit is detected, so as to generate an electromagnetic repulsion force towards the cut-off module through the magnetic drive structure; the cut-off module is used to move towards the main circuit and cut off the main circuit under the drive of the electromagnetic repulsion force.

[0062] One end of the signal processing module is connected to the main circuit to identify and process the current flowing through the main circuit, and to control the working mode of the drive module based on the identification result.

[0063] A magnetic drive is a device that uses magnetic force to transmit force and motion. One end of a pre-charged capacitor is connected to one end of the magnetic drive, and the other end of the pre-charged capacitor is connected to the other end of the magnetic drive, thus forming a magnetic drive circuit with the pre-charged capacitor and the magnetic drive.

[0064] When the signal processing module identifies the main circuit as operating at normal current, it controls the pre-charge circuit to conduct. At this time, no current flows through the magnetic drive structure in the magnetic drive circuit, and the main circuit continuously charges the pre-charge capacitor. Since no current flows through the magnetic drive structure, the magnetic drive structure does not operate, and therefore the cut-off module also does not operate, and will not cut off the main circuit.

[0065] Figure 2 A schematic diagram of another circuit protection device provided in the embodiments of this application is shown below. Figure 2 As shown, the pre-charge circuit is a circuit consisting of the main circuit, the signal processing module, and the pre-charge capacitor. The pre-charge circuit is as follows: Figure 2 The area marked by the green line.

[0066] When the signal processing module detects a fault current flowing through the main circuit, it controls the pre-charge circuit to disconnect and the magnetic drive circuit to conduct. The pre-charge capacitor begins to discharge, and the current flows through the magnetic drive structure, generating an electromagnetic repulsion force. At this time, the disconnection module, under the influence of this electromagnetic repulsion, begins to move towards the main circuit, that is, away from the magnetic drive structure, to disconnect the main circuit and achieve fault protection for the circuit.

[0067] Of course, in some embodiments, the specific circuit implementation or structure of the drive module and the cut-off module is not limited to the one provided in this solution. The drive module only needs to be able to control the cut-off module to cut off the main circuit under the action of the fault current.

[0068] In summary, the circuit protection device provided in this embodiment includes a signal processing module, a drive module, and a cut-off module. One end of the signal processing module is connected to the main circuit, and the other end is connected to the drive module. The drive module includes a pre-charge capacitor and a magnetic drive structure. The pre-charge capacitor and the magnetic drive structure are connected in series to form a circuit. The cut-off module is located between the magnetic drive structure and the main circuit. The signal processing module controls the pre-charge capacitor in the drive module to charge when the main circuit current is normal, and controls the pre-charge capacitor in the drive module to discharge when a fault current in the main circuit is detected, so as to generate an electromagnetic repulsion force towards the cut-off module through the magnetic drive structure. The cut-off module is used to move towards the main circuit and cut off the main circuit under the drive of the electromagnetic repulsion force. This solution uses a capacitor and a magnetic drive structure to form the drive module. The current generated by the capacitor discharge causes the magnetic drive structure to generate an electromagnetic repulsion force, thereby controlling the cut-off module to perform circuit cut-off operation based on the electromagnetic repulsion force. This makes the implementation of the drive module independent of pyrotechnics, and improves the usability of the circuit protection device while achieving rapid circuit protection.

[0069] Figure 3 A schematic diagram of another circuit protection device provided in the embodiments of this application is shown below. Figure 3 As shown, the drive module also includes resistors and diodes;

[0070] One end of the resistor is connected to one end of the pre-charged capacitor, and the other end of the resistor is connected to the positive terminal of the diode; the negative terminal of the diode is connected to one end of the magnetic drive structure; and the other end of the magnetic drive structure is connected to the other end of the pre-charged capacitor.

[0071] In some embodiments, the resistor can limit the charging or discharging rate of the pre-charge capacitor. Additionally, it can provide some circuit protection; when the pre-charge capacitor is directly powered on, it generates a large instantaneous current, which the resistor can limit. Furthermore, if the pre-charge capacitor fails and short-circuits, the resistor can limit the short-circuit current, preventing fires or component burnout.

[0072] The diode is also used to protect circuit components to some extent, preventing damage to them from the reverse electromotive force generated on the pre-charge capacitor.

[0073] Figure 4 A schematic diagram of another circuit protection device provided in the embodiments of this application is shown below. Figure 4 As shown, the signal processing module includes a first switch and a second switch.

[0074] One end of the first switch is connected to the positive terminal of the main circuit, and the other end of the first switch is connected to one end of the resistor; one end of the second switch is connected to one end of the resistor, and the other end of the second switch is connected to the positive terminal of the diode.

[0075] Of course, the signal processing module may also include a processor. During normal operation, the cut-off module is close to the magnetic drive structure. At this time, the cut-off module is at a certain distance from the main circuit. After the signal processing module collects the current signal of the main circuit, it identifies and processes it, and then controls the first switch to close, thus conducting the pre-charge circuit. At this time, no current flows through the magnetic drive structure in the magnetic drive circuit, and the main circuit continuously charges the pre-charge capacitor.

[0076] When a fault current flows through the main circuit, the fault current is collected by the signal processing module. After being identified and processed by the signal processing module, the first switch is controlled to open, which means the pre-charge circuit is disconnected. At the same time, the second switch is closed, and the pre-charge capacitor begins to discharge. The current flows through the magnetic drive structure. The cutting-off module responds quickly to the eddy current repulsion force and moves away from the magnetic drive structure, that is, moves towards the main circuit, so as to cut off the main circuit and disconnect the circuit current to achieve system protection.

[0077] It's worth noting that when the circuit current returns to normal, the second switch opens. When the second switch opens, the pre-charge capacitor generates a back electromotive force (EMF) in an attempt to maintain a constant current. Without a diode, this back EMF could generate a very high voltage, damaging components in the circuit. The diode provides a freewheeling path in this situation, allowing the current in the pre-charge capacitor to form a loop through the diode, gradually attenuating and thus protecting the circuit components.

[0078] Figure 5 This is a schematic diagram of a cutting module and magnetic drive structure provided in an embodiment of this application. Figure 5 As shown, the cutting module may include: a repulsion disk and a cutting piston; the magnetic drive structure includes a magnetic drive coil.

[0079] One side of the repulsion disk faces the magnetic drive coil, and the other side of the repulsion disk faces the main circuit; the cut-off piston is connected to the side of the repulsion disk facing the main circuit.

[0080] The repulsion disk is used to respond to the electromagnetic repulsion generated by the magnetic drive coil and push the cut-off piston to move upward. Since the cut-off piston faces the main circuit, it will gradually approach the main circuit during the upward movement to cut off the main circuit.

[0081] Optionally, the main circuit includes a main circuit copper busbar; a weak section is provided on the main circuit copper busbar; and the cut-off piston is disposed opposite to the weak section.

[0082] In this embodiment, the main circuit is implemented using a copper busbar. Copper has extremely high conductivity, which can effectively transmit current and reduce power loss during transmission. Using a copper busbar can reduce line resistance and improve power transmission efficiency, which is crucial for a high-capacity, high-current main circuit, ensuring that power can be efficiently delivered from the power source to various load devices.

[0083] In high-frequency current transmission, the skin effect causes current to concentrate on the conductor surface, resulting in a reduction in the effective cross-sectional area of ​​the conductor and an increase in resistance. Compared to other materials, copper busbars exhibit a relatively weaker skin effect at the same frequency, which can reduce losses during high-frequency current transmission to a certain extent and ensure signal transmission quality. This is particularly advantageous in circuits that require high-frequency performance.

[0084] Copper busbars possess high strength and good toughness, enabling them to withstand certain mechanical stresses and deformations without breaking. In the main circuit, they may be subjected to various mechanical forces such as installation stress, vibration, and thermal expansion and contraction. The high strength and toughness of copper busbars ensure that they maintain a stable physical form during long-term use, guaranteeing the reliability of circuit connections.

[0085] Copper busbars are easy to process and shape. They can be easily bent, punched, cut and processed according to different main circuit layouts and connection requirements. They can adapt to various complex installation environments and electrical connection requirements, making it convenient for installation and maintenance personnel to carry out on-site construction and commissioning.

[0086] Copper exhibits good oxidation resistance at room temperature, and its surface is not easily rusted or corroded, maintaining excellent electrical contact performance. This helps reduce problems such as increased contact resistance and overheating caused by oxidation, lowering safety hazards such as fires and improving the safety and stability of the main circuit operation.

[0087] Although copper itself is not flame-retardant, compared to some other metals, copper does not burn rapidly or produce violent chemical reactions at high temperatures like some other metals, thus not exacerbating the spread of fire and improving the safety of the main circuit in emergency situations such as fires to a certain extent.

[0088] Figure 6 This is a schematic diagram of a main circuit provided in an embodiment of this application. Figure 7This is a schematic diagram illustrating the arrangement of the cut-off piston in a main circuit and cut-off module, as provided in an embodiment of this application. Figure 6 As shown, there are weak sections on the main circuit copper busbar, and the local structural features of the weak sections are relatively thin compared to the structures of other areas on the main circuit.

[0089] like Figure 7 As shown, the cutting piston is positioned opposite to the weak part, specifically, the tip of the cutting piston is positioned opposite to the weak part, which is more conducive to stress concentration when the cutting piston is in action, and can quickly cut off the copper busbar of the main circuit to achieve circuit protection.

[0090] It should be noted that the design of the thinning section can be to set local thinning (such as trapezoidal holes or stress grooves) at specific locations on the copper busbar (such as the middle area), making that area a mechanically weak point.

[0091] The tip of the cut-off piston corresponds to the weak point, so that when the cut-off piston is moved towards the main circuit copper busbar by the external force of the repulsive disk, the force can be directly applied to the thinned part, resulting in high stress concentration. Because the cross-sectional area of ​​the weak point is small, it can generate higher stress under external force, preferentially reaching the material's yield strength, and thus fractures rapidly.

[0092] Continue as Figure 5 As shown, the magnetic drive structure may further include: a buffer section; the buffer section is disposed at the bottom of the magnetic drive coil. The buffer section is used to adjust the setting distance between the magnetic drive coil and the repulsion disk.

[0093] The bottom buffer section can serve as support in the initial state and also adjust the distance between the magnetic drive coil and the repulsion disk. When the buffer section is compressed downwards, the distance between the magnetic drive coil and the repulsion disk will increase, and when the buffer section is extended upwards, the distance between the magnetic drive coil and the repulsion disk will decrease.

[0094] In some embodiments, adjusting the distance between the magnetic drive coil and the repulsion disk can calibrate the force exerted by the magnetic drive coil on the repulsion disk, thereby matching the cutting force required for the main circuit copper busbars of different current specifications.

[0095] Larger copper busbars (such as high-current-carrying busbars) are typically thicker or have a larger cross-sectional area, requiring greater cutting force to overcome their mechanical strength. In this case, reducing the distance between the magnetic drive coil and the repulsion disk enhances the electromagnetic repulsion, ensuring rapid cutting.

[0096] Smaller copper busbars require less cutting force. Increasing the distance between the magnetic drive coil and the repulsion disk can reduce electromagnetic repulsion and prevent excessive impact from causing the copper busbar to break or the equipment to be damaged.

[0097] Continue to refer to Figure 5The magnetic drive structure may also include a drive shaft; the drive shaft is positioned on the axis of the repulsion disk and the magnetic drive coil. It can be seen that the drive shaft achieves a concentric arrangement of the repulsion disk and the magnetic drive coil, thus ensuring that the repulsion disk and the cut-off piston can only move upwards, that is, only in the direction of the main circuit, to guarantee the ability to cut off the main circuit.

[0098] Continue to refer to Figure 5 The magnetic drive structure may further include: a first ferrite and a second ferrite; the first ferrite and the second ferrite are in contact with each other to form a closed magnetic circuit; the first ferrite is disposed between the magnetic drive coil and the repulsion disk; and the second ferrite is disposed between the magnetic drive coil and the buffer section.

[0099] like Figure 5 As shown, the first Hector can be a U-shaped structure, and the second Hector can be a horizontal flat plate. When the first and second Hectors are bonded together, they form a closed magnetic circuit, enclosing the magnetic drive coil and thus fixing its position. Simultaneously, the first and second Hectors can also achieve a certain degree of magnetization.

[0100] Figure 8 This is a schematic diagram of another cutting module and magnetic drive structure provided in an embodiment of this application; as shown. Figure 8 As shown, in some embodiments, the first and second ferrites may not be used, and the magnetic drive coil may be directly fixed to the housing.

[0101] In summary, the circuit protection device provided in this embodiment includes a signal processing module, a drive module, and a cut-off module. One end of the signal processing module is connected to the main circuit, and the other end is connected to the drive module. The drive module includes a pre-charge capacitor and a magnetic drive structure. The pre-charge capacitor and the magnetic drive structure are connected in series to form a circuit. The cut-off module is located between the magnetic drive structure and the main circuit. The signal processing module controls the pre-charge capacitor in the drive module to charge when the main circuit current is normal, and controls the pre-charge capacitor in the drive module to discharge when a fault current in the main circuit is detected, so as to generate an electromagnetic repulsion force towards the cut-off module through the magnetic drive structure. The cut-off module is used to move towards the main circuit and cut off the main circuit under the drive of the electromagnetic repulsion force. This solution uses a capacitor and a magnetic drive structure to form the drive module. The current generated by the capacitor discharge causes the magnetic drive structure to generate an electromagnetic repulsion force, thereby controlling the cut-off module to perform circuit cut-off operation based on the electromagnetic repulsion force. This makes the implementation of the drive module independent of pyrotechnics, and improves the usability of the circuit protection device while achieving rapid circuit protection.

[0102] In addition, by setting a weak point on the main circuit copper busbar, and the location of the weak point corresponds to the tip of the cutting piston in the cutting module, the cutting module can quickly cut off the main circuit, thus achieving the effect of rapid circuit protection.

[0103] By incorporating a buffer section in the magnetic drive structure, the distance between the magnetic drive coil and the repulsion disk can be adjusted, thereby calibrating the force exerted by the magnetic drive coil on the repulsion disk to match the cutting force required by the main circuit copper busbars of different current specifications.

[0104] The circuit protection method implemented by the above-mentioned circuit protection device will be briefly explained below:

[0105] Figure 9 This is a flowchart illustrating a circuit protection method provided in an embodiment of this application. This method can be applied to the signal processing module in the circuit protection device provided above, such as... Figure 9 As shown, the method may include:

[0106] S101, Detect the current in the main circuit.

[0107] The signal processing module can collect the current flowing through the main circuit in real time and identify and process the collected current.

[0108] S102. Determine whether there is a current fault based on the current.

[0109] Based on the current identification results, determine whether it is a normal operating current or a fault current.

[0110] S103. If present, control the pre-charge capacitor to discharge so as to generate electromagnetic repulsion towards the cut-off module through the magnetic drive structure.

[0111] When the fault current occurs, the signal processing module can control the magnetic drive circuit to conduct by controlling the first or second switch, thereby discharging the pre-charged capacitor. The current passes through the magnetic drive coil of the magnetic drive structure. Under the action of the pulse current, the repulsion disk in the cut-off module induces eddy currents and is subjected to an upward electromagnetic repulsion force. The cut-off module moves upward, and the cut-off piston quickly cuts off the weak part on the copper busbar of the main circuit, thereby realizing the rapid cut-off of the main circuit.

[0112] When there is no fault current, the signal processing module can control the pre-charge circuit to conduct by controlling the first or second switch. The main circuit charges the pre-charge capacitor, no current flows through the magnetic drive coil, and the cut-off module does not operate.

[0113] In summary, the circuit protection method provided in this embodiment includes: detecting the current in the main circuit; determining whether a current fault exists based on the current; and if so, controlling the pre-charge capacitor to discharge, thereby generating an electromagnetic repulsion force on the cut-off module through the magnetic drive structure. Under fault current conditions, this method controls the pre-charge capacitor to discharge, enabling the magnetic drive structure to generate an electromagnetic repulsion force, thus driving the cut-off module to operate and quickly cut off the main circuit. This improves circuit protection efficiency.

[0114] Figure 10 This is a schematic diagram of an electrical device provided in an embodiment of this application, such as... Figure 10 As shown, the electrical equipment includes the circuit protection device provided above.

[0115] Optionally, electrical equipment can cover electrical equipment in different fields, such as electric motors and transformers in the industrial field; air conditioning systems, elevators, and lighting systems in the commercial field; and home appliances and smart home devices in the residential field.

[0116] In some embodiments, the circuit protection device may be integrated inside the electrical equipment, while in other embodiments, the power protection device may be installed outside the electrical equipment.

[0117] During the operation of electrical equipment, the circuit protection device can detect the current flowing through the equipment in real time and cut off the circuit when there is a fault current, thus protecting the equipment in a timely manner.

[0118] It is worth noting that some modules mentioned in the above embodiments can be one or more integrated circuits configured to implement the above methods, such as one or more Application Specific Integrated Circuits (ASICs), one or more digital signal processors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs). Furthermore, when a module is implemented through processing element scheduler code, the processing element can be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling program code. Additionally, these modules can be integrated together to form a system-on-a-chip (SOC).

[0119] The modules described above can be connected or communicate with each other via wired or wireless connections. Wired connections can include metal cables, optical fibers, hybrid cables, or any combination thereof. Wireless connections can include connections via LAN, WAN, Bluetooth, ZigBee, or NFC, or any combination thereof. Two or more modules can be combined into a single module, and any module can be divided into two or more units. Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems and devices described above can be referred to the corresponding processes in the method embodiments, and will not be repeated here.

[0120] The aforementioned signal processing module may include a processor and a storage medium.

[0121] The storage medium is used to store programs, and the processor calls the programs stored in the storage medium to execute the above-described method embodiments. The specific implementation and technical effects are similar, and will not be repeated here.

[0122] The storage medium stores program code, which, when executed by a processor, causes the processor to perform various steps in the circuit protection methods according to various exemplary embodiments of this application described in the "Exemplary Methods" section above.

[0123] The processor can be a general-purpose processor, such as a central processing unit (CPU), digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component, capable of implementing or executing the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly manifested as being executed by a hardware processor, or executed by a combination of hardware and software modules within the processor.

[0124] Storage media, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. Storage media can include at least one type of storage medium, such as flash memory, hard disks, multimedia cards, card-type storage media, random access memory (RAM), static random access memory (SRAM), programmable read-only memory (PROM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), magnetic storage media, magnetic disks, optical disks, etc. Storage media can be any other medium capable of carrying or storing desired program code in the form of instructions or data structures that can be accessed by a computer, but is not limited to this. The storage medium 802 in the embodiments of this application can also be a circuit or any other device capable of implementing storage functions for storing program instructions and / or data.

[0125] Optionally, this application also provides a program product, such as a computer-readable storage medium, including a program that, when executed by a processor, performs the above-described method embodiments.

[0126] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0127] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0128] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or in a combination of hardware and software functional units.

[0129] The integrated units implemented as software functional units described above can be stored in a computer-readable storage medium. These software functional units, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute some steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

Claims

1. A circuit protection device, characterized in that, include: Signal processing module, drive module, and cut-off module; One end of the signal processing module is connected to the main circuit, and the other end of the signal processing module is connected to the drive module; The drive module includes a pre-charge capacitor and a magnetic drive structure; the pre-charge capacitor and the magnetic drive structure are connected in series to form a circuit. The cutting module is located between the magnetic drive structure and the main circuit; The signal processing module is used to control the pre-charge capacitor in the drive module to charge when the main circuit current is normal, and to control the pre-charge capacitor in the drive module to discharge when a fault current in the main circuit is detected, so as to generate an electromagnetic repulsion force to the cut-off module through the magnetic drive structure. The cutting-off module is used to move toward the main circuit under the drive of the electromagnetic repulsion force and cut off the main circuit.

2. The circuit protection device according to claim 1, characterized in that, The driving module also includes: resistors and diodes; One end of the resistor is connected to one end of the pre-charged capacitor, and the other end of the resistor is connected to the positive terminal of the diode; The negative terminal of the diode is connected to one end of the magnetic drive structure; The other end of the magnetic drive structure is connected to the other end of the pre-charged capacitor.

3. The circuit protection device according to claim 2, characterized in that, The signal processing module includes a first switch and a second switch; One end of the first switch is connected to the positive terminal of the main circuit, and the other end of the first switch is connected to one end of the resistor; One end of the second switch is connected to one end of the resistor, and the other end of the second switch is connected to the positive terminal of the diode.

4. The circuit protection device according to claim 1, characterized in that, The cutting module includes a repulsion disk and a cutting piston; the magnetic drive structure includes a magnetic drive coil. One side of the repulsion disk faces the magnetic drive coil, and the other side of the repulsion disk faces the main circuit; the cut-off piston is connected to the side of the repulsion disk facing the main circuit.

5. The circuit protection device according to claim 4, characterized in that, The main circuit includes a main circuit copper busbar; a weak point is provided on the main circuit copper busbar; The cutting piston is positioned opposite to the weak point.

6. The circuit protection device according to claim 4, characterized in that, The magnetic drive structure further includes a buffer section; the buffer section is disposed at the bottom of the magnetic drive coil; The buffer section is used to adjust the setting distance between the magnetic drive coil and the repulsion disk.

7. The circuit protection device according to claim 4, characterized in that, The magnetic drive structure further includes: a drive shaft; The drive shaft is located on the axis between the repulsion disk and the magnetic drive coil.

8. The circuit protection device according to claim 6, characterized in that, The magnetic drive structure further includes: a first Hector iron and a second Hector iron; the first Hector iron and the second Hector iron are in contact with each other to form a closed magnetic circuit; The first ferrite is disposed between the magnetic drive coil and the repulsion disk; The second ferrite is disposed between the magnetic drive coil and the buffer section.

9. A circuit protection method, characterized in that, The signal processing module applied in the circuit protection device according to any one of claims 1-8, the method comprising: Detect the current in the main circuit; Based on the current, determine whether a current fault exists. If present, the pre-charge capacitor is controlled to discharge, thereby generating an electromagnetic repulsion force on the cut-off module through the magnetic drive structure.

10. An electrical appliance, characterized in that, Includes the circuit protection device as described in any one of claims 1-8.

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