Circuit protection device and circuit protection method

Abstract

The application provides a circuit protection device and a circuit protection method. The device comprises a shell, a control circuit and a main circuit arranged in the shell; an input port of the control circuit is connected with a signal fuse, and an output port of the control circuit is connected with a cut-off element; the signal fuse is connected in series with the main circuit; the output port of the control circuit is further connected with a state indicating mechanism; the control circuit is used for carrying out fault cut-off control on the main circuit and state indicating switch control on the state indicating mechanism according to a fuse state of the signal fuse. By connecting the state indicating mechanism with the output port of the control circuit and integrating an energy storage unit in the control circuit, the control circuit can trigger the cut-off element to cut off the main circuit by using arc voltage generated by the signal fuse after a fault occurs in the main circuit, meanwhile, the energy storage unit is charged by using energy generated by the signal fuse during continuous arc, and the state indicating mechanism is driven to realize state switching by discharging of the energy storage unit after the main circuit is successfully cut off and the signal fuse is extinguished.

Description

Technical Field

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

[0002] As an advanced circuit protection device, the excitation fuse triggers an ignition device by using the arc voltage generated by the melting of the signal fuse wire. The ignition device then uses the power generated by its action to quickly disconnect the fault current, which has the advantages of strong breaking capacity and fast action speed.

[0003] Currently, the signal fuse in existing excitation fuses continues to arc after it blows. The arc voltage generated will no longer have functional value after triggering the ignition device. Prolonged arcing will burn the internal insulation material and shell of the product, affecting the product's safety and lifespan. At the same time, existing excitation fuses do not have a status indication function, making it impossible to quickly determine whether the excitation fuse has been used. Summary of the Invention

[0004] The purpose of this application is to address the shortcomings of the prior art by providing a circuit protection device and a circuit protection method, so as to effectively absorb the arc voltage generated by the continuous arcing of the signal fuse in the protection device, and to effectively display the operating status of the protection device by using the arc voltage trigger.

[0005] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows: In a first aspect, embodiments of this application provide a circuit protection device, including: a housing and a control circuit and a main circuit disposed within the housing; The input port of the control circuit is connected to a signal fuse, and the output port of the control circuit is connected to a cut-off element. The output port of the control circuit is also connected to a status indicator mechanism; The signal fuse is connected in series in the main circuit; The control circuit is used to perform fault cut-off control on the main circuit and to perform status indication switching control on the status indication mechanism according to the fuse's blowing status.

[0006] Optionally, the control circuit includes: a drive unit and an energy storage unit; one end of the drive unit is connected to the input terminal of the control circuit, and the other end of the drive unit is connected to the energy storage unit; The driving unit turns on after the signal fuse blows and drives the energy storage unit to charge according to the arc voltage generated by the blown signal fuse. The driving unit disconnects after the signal fuse extinguishes the arc, thereby driving the energy storage unit to discharge.

[0007] Optionally, the control circuit further includes: a cut-off element trigger circuit; The cutting element trigger circuit is used to drive the cutting element to cut off the main circuit according to the arc voltage generated by the fuse melting.

[0008] Optionally, the energy storage unit includes a discharge circuit, which is connected to the status indication mechanism; During the discharge process, the energy storage unit drives the status indication mechanism to operate through the discharge circuit.

[0009] Optionally, the control circuit further includes: a signal clamping unit; The signal clamping unit is used to limit the operating voltage of the status indication mechanism and the cut-off element.

[0010] Optionally, the status indication mechanism includes: a magnetic latching relay and a mechanical indication mechanism; The magnetic latching relay is connected to the discharge circuit via a magnetic latching coil; The mechanical indicating mechanism is mechanically coupled to the moving part of the magnetic latching relay; During the discharge process, the energy storage unit drives the magnetic latching relay to operate through the discharge circuit; the operation of the magnetic latching relay drives the mechanical indicating mechanism to move to switch states.

[0011] Optionally, the mechanical indicating mechanism includes: a lever and a sliding indicator; The lever is connected to the moving part of the magnetic latching relay; The lever is also connected to the sliding indicator; The sliding indicator has a first state indicator and a second state indicator arranged side by side.

[0012] Optionally, a status display window is also provided on the housing; When the magnetic latching relay is activated, the lever pushes the sliding indicator to slide, so that the indicator corresponding to the status display window is switched from the first status indicator to the second status indicator; the second status indicator is used to indicate that the circuit protection device is in use; the first status indicator is used to indicate that the circuit protection device is not in use.

[0013] Secondly, embodiments of this application also provide a circuit protection method, applied to the control circuit of the circuit protection device described in the first aspect; the method includes: Detect the fuse's melting status; Based on the fuse failure status, fault cut-off control is performed on the main circuit and status indication switching control is performed on the status indication mechanism.

[0014] Optionally, the step of performing fault disconnection control and status indication switching control on the main circuit based on the fuse state includes: After detecting that the signal fuse has blown, the main circuit is cut off by the cutting element according to the arc voltage generated by the blown signal fuse, and the energy storage unit is charged. After detecting that the signal fuse has extinguished the arc, the energy storage unit is controlled to discharge, thereby controlling the state indicator mechanism to switch states.

[0015] The beneficial effects of this application are: This application provides a circuit protection device and a circuit protection method. The circuit protection device includes: a housing and a control circuit and a main circuit disposed within the housing; the input port of the control circuit is connected to a signal fuse, and the output port of the control circuit is connected to a cutting element; the signal fuse is connected in series in the main circuit; the output port of the control circuit is also connected to a status indication mechanism; the control circuit is used to perform fault cutting control on the main circuit according to the melting state of the signal fuse and to perform status indication switching control on the status indication mechanism. This device connects the status indication mechanism to the output of the control circuit and integrates an energy storage unit in the control circuit. This allows the control circuit to quickly cut off the main circuit after a fault occurs by using the arc voltage generated by the melting of the signal fuse to trigger the cutting element; simultaneously, it can use the arc voltage generated by the continuous arcing of the signal fuse to charge the energy storage unit. Thus, after the main circuit is successfully cut off and the signal fuse extinguishes its arc, the energy storage unit can discharge to drive the status indication mechanism to switch the status display in the status display window. This device can effectively absorb the energy generated by the continuous arcing of the signal fuse and make effective use of this energy to effectively display the device's operating status. This not only extends the device's service life but also effectively solves the problem of missing status indicators.

[0016] The circuit protection method includes: detecting the melting state of the signal fuse; and, based on the melting state, performing fault disconnection control and status indication switching control of the main circuit. Through circuit and structural design, this method utilizes the arc voltage generated by the melting of the signal fuse to drive the disconnection element to disconnect the main circuit after a fault occurs. Simultaneously, it effectively utilizes the arc voltage generated by the continuous arcing of the signal fuse to charge the energy storage unit. Thus, after the main circuit is successfully disconnected and the signal fuse arc is extinguished, the energy storage unit discharges to drive the status indication mechanism for status indication switching, achieving effective display of the operating status of the circuit protection device. Attached Figure Description

[0017] 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.

[0018] Figure 1 A schematic diagram of a circuit protection device provided in an embodiment of this application; Figure 2 A schematic diagram of the circuit structure of a control circuit provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a circuit protection device provided in an embodiment of this application; Figure 4 This is a partial structural schematic diagram of a circuit protection device provided in an embodiment of this application; Figure 5 This is a schematic diagram illustrating the display switching of a sliding indicator provided in an embodiment of this application; Figure 6 A schematic flowchart illustrating a circuit protection method provided in an embodiment of this application; Figure 7 This is a flowchart illustrating another circuit protection method provided in an embodiment of this application. Detailed Implementation

[0019] 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.

[0020] 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.

[0021] 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.

[0022] Currently, traditional activated fuses all employ a fully sealed structure to ensure dustproof, waterproof, and explosion-proof safety. However, this makes it impossible to directly determine from the appearance whether the fuse has tripped (whether it has completed fault protection). In large systems such as photovoltaic power plants, maintenance personnel need to check the status of each fuse individually, resulting in low testing efficiency and high operation and maintenance costs.

[0023] Secondly, the signal fuse in the fuse continues to arc during the breaking process, and the resulting arc energy (30-40V arc voltage) is only used to trigger the ignition device in the initial stage. After the ignition device is triggered, the continuous arcing in the signal fuse area no longer has functional value, but instead becomes harmful energy. Prolonged arcing will burn the internal insulation materials and shell of the product, affecting the product's safety and lifespan.

[0024] Figure 1 A schematic diagram of a circuit protection device provided in an embodiment of this application; as shown Figure 1 As shown, the device may include: a housing and a control circuit and a main circuit disposed within the housing; the input port of the control circuit is connected to a signal fuse, and the output port of the control circuit is connected to a cut-off element; the signal fuse is connected in series in the main circuit.

[0025] When a fault current occurs in the main circuit, the signal fuse will automatically blow. The arc voltage generated by the blown signal fuse is transmitted to the control circuit, which then controls the cutting element to disconnect the main circuit from the fault.

[0026] In this embodiment, the cutting element may include an igniter and an actuator. That is, the output terminal of the control circuit is connected to the igniter. The arc voltage generated by the melting of the signal fuse is transmitted to the control circuit, which controls the igniter to detonate. After the igniter is activated, it triggers the actuator to move to disconnect the main circuit.

[0027] The output port of the control circuit is also connected to a status indicator mechanism. The status indicator mechanism is used to indicate the operating status of the circuit protection device, which includes whether it is in use or not. Being in use means that the circuit protection device has completed fault disconnection.

[0028] In some embodiments, after the ignition device detonates and cuts off the main circuit fault, the signal fuse will continue to arc. The control circuit can store energy according to the arc voltage, and after the arc is extinguished, the stored energy controls the status indicator mechanism to switch states, thereby effectively utilizing the energy generated by the continuous arcing of the signal fuse to effectively display the usage status of the circuit protection device.

[0029] The control circuit is used to perform fault cut-off control on the main circuit based on the fuse's blown state and to perform state indication switching control on the status indication mechanism.

[0030] Optionally, the control circuit can control the ignition device to detonate after the signal fuse blows in order to cut off the main circuit from the fault, and after the signal fuse extinguishes the arc, the control status indicator mechanism can switch the status indication to effectively display the usage status of the device.

[0031] In summary, the circuit protection device provided in this embodiment includes: a housing and a control circuit and a main circuit disposed within the housing; the input port of the control circuit is connected to a signal fuse, and the output port of the control circuit is connected to a cutting element; the signal fuse is connected in series in the main circuit; the output port of the control circuit is also connected to a status indicator mechanism; the control circuit is used to perform fault cutting control on the main circuit and status indication switching control on the status indicator mechanism according to the melting state of the signal fuse. This device integrates a status indication switching function into the control circuit by connecting the status indicator mechanism to the output of the control circuit. This allows the control circuit to utilize the energy generated by the continuous arcing of the signal fuse to control the status indicator mechanism to switch states after fault disconnection, effectively absorbing the energy generated by the continuous arcing of the signal fuse. Simultaneously, it effectively displays the device's operating status, extending the device's service life and effectively solving the problem of missing status indication.

[0032] Figure 2 This is a schematic diagram of the circuit structure of a control circuit provided in an embodiment of this application, as shown below. Figure 2 As shown, the control circuit includes: a drive unit and an energy storage unit; one end of the drive unit is connected to the input terminal of the control circuit, and the other end of the drive unit is connected to the energy storage unit; the drive unit conducts after the signal fuse blows and drives the energy storage unit to charge according to the arc voltage generated by the blown signal fuse; the drive unit disconnects after the signal fuse extinguishes the arc, thereby driving the energy storage unit to discharge.

[0033] The driving unit may include a voltage divider unit, a current limiting unit, a switching unit, and a rectification unit. The voltage divider unit includes resistors R1 and R2 for voltage division. The current limiting unit includes diodes D1 and D2, which limit the current flowing through the switching unit to prevent overcurrent damage. The switching unit includes MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) Q1 and Q2. The rectification unit includes diodes D3, D4, D5, and D7, which serve as transient suppression and freewheeling protection, protecting the switching unit from reverse high-voltage surges from the status indication mechanism connected to the energy storage unit.

[0034] When a fault occurs in the main circuit, the arc voltage generated after the signal fuse blows causes the switching unit to conduct. The arc voltage generated during the continuous arcing of the signal fuse charges the energy storage unit. After the fault is cleared, the signal fuse extinguishes the arc, the switching unit opens, and the energy storage unit begins to discharge.

[0035] In addition, J1 and J4 in the figure are two input ports of the control circuit, J2 is the output port connected to the switching element, and J3 is the output port connected to the status indicator mechanism.

[0036] Optionally, the control circuit further includes: a cut-off element trigger circuit; the cut-off element trigger circuit is used to drive the cut-off element to cut off the main circuit according to the arc voltage generated by the melting of the signal fuse.

[0037] The arc voltage generated by the melting of the signal fuse turns on the switching unit, and the voltage transmission can charge the energy storage unit on the one hand, and turn on the trigger circuit of the cutting element on the other hand, thereby triggering the cutting element to cut off the main circuit.

[0038] In some embodiments, the cutting element may include an igniter and an actuator. The igniter can be detonated by triggering the cutting element's circuit, thereby driving the actuator to cut off the main circuit.

[0039] Optionally, the energy storage unit includes a discharge circuit, which is connected to a status indicator mechanism; during the discharge process, the energy storage unit drives the status indicator mechanism to operate through the discharge circuit.

[0040] When the cutting element cuts off the main circuit, the signal fuse gradually extinguishes the arc. After the arc is extinguished, the switching unit is disconnected, and the energy storage unit begins to discharge. This discharges the energy storage unit, which then drives the connected status indicator mechanism to switch the operating status of the circuit protection device.

[0041] Optionally, the control circuit also includes a signal clamping unit; the signal clamping unit is used to limit the operating voltage of the status indication mechanism and the cut-off element.

[0042] Continue as Figure 2 As shown, the signal clamping unit includes a diode D6 and a varistor RV1.

[0043] Diode D6 absorbs little energy but reacts quickly, while varistor RV1 absorbs a lot of energy but reacts slowly. By combining diode D6 with varistor RV1, a signal clamping unit is formed, which can be used to limit the voltage of the trigger circuit of the cut-off element and the voltage of the discharge circuit of the energy storage unit, thereby controlling the operating voltage of the status indication mechanism and the cut-off element.

[0044] Figure 3 This is a schematic diagram of the structure of a circuit protection device provided in an embodiment of this application, as shown below. Figure 3 As shown, the entire structure is housed within the casing, and the status indication mechanism includes a magnetic latching relay and a mechanical indication mechanism. The magnetic latching relay is connected to the discharge circuit via a magnetic latching coil; the mechanical indicating mechanism is mechanically coupled to the moving part of the magnetic latching relay. During the discharge process, the energy storage unit drives the magnetic latching relay to operate through the discharge circuit; the operation of the magnetic latching relay drives the mechanical indicating mechanism to switch states.

[0045] In some embodiments, when a magnetic latching relay is energized, its mechanical parts change position, thereby driving or linking the mechanical indicating mechanism to move to achieve state switching.

[0046] Specifically, the energy storage unit can release the stored energy through the discharge circuit, thereby driving the mover of the magnetic latching relay to move. The mechanical coupling between the mover and the mechanical indicating mechanism allows the mechanical indicating mechanism to move during the movement of the mover.

[0047] Optionally, the mechanical indicating mechanism includes: a lever and a sliding indicator; the lever is connected to the mover of a magnetic latching relay; the lever is also connected to the sliding indicator; a first state indicator and a second state indicator are arranged side by side on the sliding indicator.

[0048] Figure 4 This is a partial structural schematic diagram of a circuit protection device provided in an embodiment of this application, as shown below. Figure 4 As shown, the mechanical indicating mechanism may include a lever and a sliding indicator; one end of the lever is connected to the mover of the magnetic latching relay, and the other end of the lever is connected to the sliding indicator. The first state indicator part arranged side by side on the sliding indicator is shown in the green area of ​​the figure, and the second state indicator part is shown in the red area of ​​the figure.

[0049] Optionally, a status display window is also provided on the housing; when the magnetic latching relay is activated, the sliding indicator is pushed to slide by the lever, so that the indicator corresponding to the status display window is switched from the first status indicator to the second status indicator; the second status indicator is used to indicate that the circuit protection device has been used; the first status indicator is used to indicate that the circuit protection device has not been used.

[0050] Continue as Figure 4 As shown, a status display window is also provided at the location of the sliding indicator on the housing. The status display window is transparent. In the initial state, that is, when the circuit protection device is not in use, the indicator corresponding to the status display window is displayed as the first status indicator in green. When the main circuit is successfully disconnected and the signal fuse completes arc extinguishing, the energy storage unit discharges through the discharge circuit to drive the magnetic latching relay to operate. When the magnetic latching relay operates, the sliding indicator can be pushed laterally by the lever, causing the indicator corresponding to the status display window to switch from the first status indicator to the second status indicator. Thus, maintenance personnel can quickly observe that the circuit protection device has been used through the status display window.

[0051] Figure 5 This is a schematic diagram illustrating the display switching of a sliding indicator provided in an embodiment of this application. When the magnetic latching relay is activated, the moving element of the magnetic latching relay can drive the lever to rotate counterclockwise, thereby moving the sliding indicator to the left, so as to change the sliding indicator from... Figure 5 (a) The first state indicator shown in the image switches to... Figure 5 The second state indicator is shown in (b) of the diagram.

[0052] In summary, the circuit protection device provided in this embodiment includes: a housing and a control circuit and a main circuit disposed within the housing; the input port of the control circuit is connected to a signal fuse, and the output port of the control circuit is connected to a cutting element; the signal fuse is connected in series in the main circuit; the output port of the control circuit is also connected to a status indicator mechanism; the control circuit is used to perform fault cutting control on the main circuit and status indication switching control on the status indicator mechanism according to the melting state of the signal fuse. This device connects the status indicator mechanism to the output of the control circuit and integrates an energy storage unit in the control circuit, enabling the control circuit to quickly cut off the main circuit by triggering the cutting element with the arc voltage generated by the melting of the signal fuse after a fault occurs in the main circuit; simultaneously, it can use the arc voltage generated by the continuous arcing of the signal fuse to charge the energy storage unit, so that after the main circuit is successfully cut off and the signal fuse arc is extinguished, the energy storage unit can discharge to drive the status indicator mechanism to switch the status display in the status display window. This device can effectively absorb and utilize the energy generated by the continuous arcing of the signal fuse, achieving effective display of the device's operating status, not only improving the device's service life but also effectively solving the problem of missing status indication.

[0053] Figure 6 This is a flowchart illustrating a circuit protection method provided in an embodiment of this application. This method can be applied to the control circuit of the aforementioned circuit protection device; such as... Figure 6 As shown, the method includes: S101, Detect the fuse status of the signal fuse.

[0054] Under normal operating conditions, if there is no fault in the main circuit, the current in the main circuit is normal, and the signal fuse connected in series in the main circuit does not work.

[0055] When a short circuit or open circuit occurs in the main circuit, the signal fuse melts due to the fault current and generates an arc voltage. The control circuit can detect the melting status of the signal fuse in real time.

[0056] S102. Based on the fuse status, perform fault disconnection control and status indication switching control on the main circuit.

[0057] When the signal fuse is detected to have blown, the drive unit in the control circuit is turned on. The arc voltage generated by the blown signal fuse is transmitted to the energy storage unit to charge the energy storage unit. At the same time, it is transmitted to the tripping element trigger circuit to trigger the tripping element to cut off the fault current in the main circuit.

[0058] After the fault current in the main circuit is cut off and the arc of the signal fuse is extinguished, the drive unit in the control circuit is disconnected, the energy storage unit begins to discharge, thereby driving the status indicator mechanism connected to the discharge circuit of the energy storage unit to switch the status indication, so as to switch the use status of the circuit protection device from never used to used.

[0059] In summary, the circuit protection method provided in this embodiment includes: detecting the melting state of the signal fuse; performing fault disconnection control and status indication switching control on the main circuit based on the melting state. Through circuit and structural design, this method allows the arc voltage generated by the melting of the signal fuse to drive the disconnection element to disconnect the main circuit after a fault occurs. Simultaneously, it effectively utilizes the arc voltage generated by the continuous arcing of the signal fuse to charge the energy storage unit. Thus, after the main circuit is successfully disconnected and the signal fuse arc is extinguished, the energy storage unit discharges to drive the status indication mechanism to switch status indications, thereby achieving effective display of the operating status of the circuit protection device.

[0060] Figure 7 This is a flowchart illustrating another circuit protection method provided in an embodiment of this application. Optionally, in step S102, based on the fuse state, fault disconnection control and state indication switching control are performed on the main circuit, including: S201. After detecting that the signal fuse has blown, the main circuit is cut off by the cutting element according to the arc voltage generated by the blown signal fuse, and the energy storage unit is charged.

[0061] In some embodiments, when the signal fuse is detected to have blown, the drive unit can be turned on based on the arc voltage generated by the blown signal fuse, thereby transmitting the voltage to the cut-off element trigger circuit, and triggering the cut-off element to cut off the main circuit.

[0062] At the same time, voltage is transferred to the energy storage unit to charge it.

[0063] S202. After detecting that the signal fuse has extinguished the arc, control the energy storage unit to discharge so as to control the status indicator mechanism to switch states.

[0064] When the main circuit is disconnected and the signal fuse is successfully extinguished, the drive unit is disconnected. At this time, the energy storage unit starts to discharge, and the magnetic latching relay in the connected drive status indicator mechanism is energized through the discharge circuit. The mover of the magnetic latching relay moves, thereby driving the lever in the mechanical indicator mechanism to move, so as to push the sliding indicator laterally and complete the switching of the status indication.

[0065] It is worth noting that the control circuit described above can be integrated into a control board, which can be a printed circuit board (PCB). The control board can be configured as one or more integrated circuits implementing 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), etc.

[0066] Two or more units can be combined into a single module, and any module can be divided into two or more units. Those skilled in the art will readily understand that, for the sake of convenience and brevity, the specific working process of the device described above can be referred to the corresponding process in the embodiments, and will not be repeated here.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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 of 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: The housing and the control circuit and main circuit disposed within the housing; The input port of the control circuit is connected to a signal fuse, and the output port of the control circuit is connected to a cut-off element. The output port of the control circuit is also connected to a status indicator mechanism; The signal fuse is connected in series in the main circuit; The control circuit is used to perform fault cut-off control on the main circuit and to perform status indication switching control on the status indication mechanism according to the fuse's blowing status.

2. The circuit protection device according to claim 1, characterized in that, The control circuit includes: a drive unit and an energy storage unit; one end of the drive unit is connected to the input terminal of the control circuit, and the other end of the drive unit is connected to the energy storage unit. The driving unit turns on after the signal fuse blows and drives the energy storage unit to charge according to the arc voltage generated by the blown signal fuse. The driving unit disconnects after the signal fuse extinguishes the arc, thereby driving the energy storage unit to discharge.

3. The circuit protection device according to claim 2, characterized in that, The control circuit further includes: a cutoff element trigger circuit; The cutting element trigger circuit is used to drive the cutting element to cut off the main circuit according to the arc voltage generated by the fuse melting.

4. The circuit protection device according to claim 2, characterized in that, The energy storage unit includes a discharge circuit, which is connected to the status indication mechanism. During the discharge process, the energy storage unit drives the status indication mechanism to operate through the discharge circuit.

5. The circuit protection device according to claim 2, characterized in that, The control circuit further includes: a signal clamping unit; The signal clamping unit is used to limit the operating voltage of the status indication mechanism and the cut-off element.

6. The circuit protection device according to claim 4, characterized in that, The status indication mechanism includes: a magnetic latching relay and a mechanical indication mechanism; The magnetic latching relay is connected to the discharge circuit via a magnetic latching coil; The mechanical indicating mechanism is mechanically coupled to the moving part of the magnetic latching relay; During the discharge process, the energy storage unit drives the magnetic latching relay to operate through the discharge circuit; the operation of the magnetic latching relay drives the mechanical indicating mechanism to move to switch states.

7. The circuit protection device according to claim 6, characterized in that, The mechanical indicating mechanism includes: a lever and a sliding indicator; The lever is connected to the moving part of the magnetic latching relay; The lever is also connected to the sliding indicator; The sliding indicator has a first state indicator and a second state indicator arranged side by side.

8. The circuit protection device according to claim 7, characterized in that, The housing is also provided with a status display window; When the magnetic latching relay is activated, the lever pushes the sliding indicator to slide, so that the indicator corresponding to the status display window is switched from the first status indicator to the second status indicator; the second status indicator is used to indicate that the circuit protection device is in use; the first status indicator is used to indicate that the circuit protection device is not in use.

9. A circuit protection method, characterized in that, The control circuit is applied to the circuit protection device according to any one of claims 1-8; the method includes: Detect the fuse's melting status; Based on the fuse failure status, fault cut-off control is performed on the main circuit and status indication switching control is performed on the status indication mechanism.

10. The method according to claim 9, characterized in that, The step of performing fault disconnection control and status indication switching control on the main circuit based on the fuse status includes: After detecting that the signal fuse has blown, the main circuit is cut off by the cutting element according to the arc voltage generated by the blown signal fuse, and the energy storage unit is charged. After detecting that the signal fuse has extinguished the arc, the energy storage unit is controlled to discharge, thereby controlling the state indicator mechanism to switch states.

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