Circuit protection device

Abstract

The utility model discloses a circuit protection device, comprising at least one main loop, the at least one main loop is connected in series with a cut-off action device, a sampling module is connected in series on the at least one main loop and is located at one side of the cut-off action device, two ends of the sampling module are electrically connected with the cut-off action device, and the sampling module is electrically connected with the cut-off action device. The energy conversion module is connected to the two ends of the sampling module in series and electrically connected to a loop of the cut-off action device, and the energy conversion module can convert the variable voltage signal output by the sampling module to output pulse excitation voltage so as to conduct ignition operation on the cut-off action device. Power is taken through the main circuit, an excitation signal directly comes from current change of the main circuit, an external power supply is not needed, and the reliability of the intelligent fuse is improved.

Description

Technical Field

[0001] This utility model belongs to the field of switch technology, specifically relating to a circuit protection device. Background Technology

[0002] An excitation fuse works by detonating gunpowder to generate a high-pressure impact, which then drives a mechanical device to cut off the circuit. It mainly consists of an excitation module, an execution module, and an arc-extinguishing device. The excitation module receives an excitation signal and then explodes to generate a high-pressure impact. Excitation signal acquisition methods are typically divided into external active excitation and internal passive excitation. The execution module uses the thrust of the high-pressure impact to drive a piston or knife switch, cutting off the main circuit's conductive components and disconnecting the circuit. The arc-extinguishing device, after cutting off the high-pressure current and generating a large electric arc, uses a small arc-extinguishing fuse or grid to transfer and absorb the arc's energy.

[0003] In existing technologies, the excitation fuse relies on external sensors and MCU control systems, requiring continuous external power supply. When the power supply fails, the protection function is completely lost, creating a safety hazard. The multi-level control architecture also leads to response delays. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies, such as the reliance on external sensors and MCU control systems for excitation fuses, the need for continuous external power supply, the complete loss of protection function when the power supply fails, which creates safety hazards, and the response delay caused by multi-level control architecture. This invention provides a circuit protection device that draws power from the main circuit, with the excitation signal directly derived from the current change in the main circuit, eliminating the need for an external power supply and improving the reliability of intelligent fuses.

[0005] Technical solution

[0006] To achieve the above-mentioned technical objectives, this utility model provides a circuit protection device, including at least one main circuit, a cut-off action device connected in series on the at least one main circuit, a sampling module connected in series on the at least one main circuit located on one side of the cut-off action device, the two ends of the sampling module being electrically connected to the cut-off action device, and an energy conversion module connected in series on the circuit where the two ends of the sampling module are electrically connected to the cut-off action device. The energy conversion module can convert the changing voltage signal output by the sampling module into an output pulse excitation voltage to ignite the cut-off action device.

[0007] In one embodiment, the sampling module includes a main circuit resistor connected in series in the main circuit, and a sampling resistor connected in parallel across the main circuit.

[0008] In one embodiment, the energy conversion module includes a transformer pulse excitation module.

[0009] In one embodiment, the cutting-off device includes an ignition electrode pair, the output of the energy conversion module is connected to the ignition electrode pair, and the output pulse excitation voltage of the energy conversion module triggers the ignition electrode pair to ignite the reaction chamber, thereby driving the cutting-off mechanism to cut off the main circuit.

[0010] In one embodiment, a capacitor is connected in series on one side of the sampling resistor.

[0011] In one embodiment, the energy conversion module includes a step-down isolation module and a pulse transformer module, the two ends of which are connected in series to the two ends of the sampling module and electrically connected to the circuit of the cut-off action device.

[0012] In one embodiment, the resistance value Rs of the sampling resistor is greater than 10 times the line impedance R0.

[0013] In one embodiment, the ignition electrode pair is a tungsten electrode pair.

[0014] In one embodiment, the tungsten electrode pair has a diameter of 0.5 mm and a tip curvature radius of 50 μm.

[0015] Beneficial effects

[0016] This invention provides a circuit protection device, including at least one main circuit. A disconnection device is connected in series on the at least one main circuit. A sampling module is connected in series on the at least one main circuit, located on one side of the disconnection device. The two ends of the sampling module are electrically connected to the disconnection device. An energy conversion module is connected in series on the circuit where the two ends of the sampling module are electrically connected to the disconnection device. The energy conversion module can convert the changing voltage signal output by the sampling module into an output pulse excitation voltage to ignite the disconnection device. Power is drawn from the main circuit, and the excitation signal directly comes from the current change in the main circuit, eliminating the need for an external power supply and improving the reliability of the intelligent fuse. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, 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 the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Appendix Figure 1 This is the connection principle of the embodiment of the present utility model. Figure 1 ;

[0019] Appendix Figure 2This is the connection principle of the embodiment of the present utility model. Figure 2 ;

[0020] Appendix Figure 3 This is the connection principle of the embodiment of the present utility model. Figure 3 ;

[0021] Appendix Figure 4 This is the connection principle of the embodiment of the present utility model. Figure 4 . Detailed Implementation

[0022] 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. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0027] Example

[0028] As attached Figure 1 As shown, a circuit protection device includes at least one main circuit 1, with a cut-off action device 2 connected in series on the at least one main circuit 1. A sampling module 3 is connected in series on the at least one main circuit 1 and located on one side of the cut-off action device 2. The two ends of the sampling module 3 are electrically connected to the cut-off action device 2. An energy conversion module 4 is connected in series on the circuit where the two ends of the sampling module 3 are electrically connected to the cut-off action device 2. The energy conversion module 4 can convert the changing voltage signal output by the sampling module 3 into an output pulse excitation voltage to ignite the cut-off action device 2.

[0029] Among them, as attached Figure 2 As shown, the sampling module 3 includes a main circuit resistor 3a connected in series in the main circuit 1, and a sampling resistor 3b connected in parallel across the main circuit 1. The energy conversion module 4 includes a transformer pulse excitation module 4a. The cutting-off device 2 includes an ignition electrode pair 2a. In this embodiment, the resistance value Rs of the sampling resistor 3b is greater than 10 times the line impedance R0, and the ignition electrode pair 2a is a tungsten electrode pair. The tungsten electrode pair preferably has a diameter of 0.5 mm and a tip curvature radius of 50 μm. The output terminal of the energy conversion module 4 is connected to the ignition electrode pair 2a. The output pulse excitation voltage of the energy conversion module 4 triggers the ignition electrode pair 2a to ignite the reaction chamber 2b, thereby pushing the cutting-off mechanism 2c to cut off the main circuit 1. Further, as shown in the attached... Figure 3 As shown, capacitor 5 is connected in series on one side of the sampling resistor 3b. (See attached diagram) Figure 4 As shown, the energy conversion module 4 includes a step-down isolation module 4b and a pulse transformer module 4c. The two ends of the step-down isolation module 4b and the pulse transformer module 4c are connected in series and then connected in series to the two ends of the sampling module 3 and electrically connected to the circuit of the cut-off action device 2.

[0030] The working principle of this embodiment is as follows: When the current of the circuit system exceeds the set threshold (e.g., current I > 1.5In), the voltage Vs of the sampling module 3 is greater than the threshold voltage Vth. After being processed by the three-stage step-down architecture of the energy conversion module 4, the output trigger voltage Vt (preferably 12V) generates a plasma arc between the tungsten electrode pairs. The arc energy ignites the charge in the MGG reaction chamber (preferably arc energy > 10mJ), and the explosion impulse drives the cutting mechanism to quickly cut off the circuit (generally, the action time is < 2ms).

[0031] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0032] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A circuit protection device, characterized in that: It includes at least one main circuit (1), on which a cut-off action device (2) is connected in series. A sampling module (3) is connected in series on the at least one main circuit (1) and located on one side of the cut-off action device (2). The two ends of the sampling module (3) are electrically connected to the cut-off action device (2). An energy conversion module (4) is connected in series on the circuit of the sampling module (3) and electrically connected to the cut-off action device (2). The energy conversion module (4) can convert the changing voltage signal output by the sampling module (3) into an output pulse excitation voltage to ignite the cut-off action device (2).

2. The circuit protection device as described in claim 1, characterized in that: The sampling module (3) includes a main circuit resistor (3a), which is connected in series in the main circuit (1), and a sampling resistor (3b) is connected in parallel across the main circuit (1).

3. The circuit protection device as described in claim 1, characterized in that: The energy conversion module (4) includes a transformer pulse excitation module (4a).

4. The circuit protection device as described in claim 1, characterized in that: The cutting-off device (2) includes an ignition electrode pair (2a). The output end of the energy conversion module (4) is connected to the ignition electrode pair (2a). The output pulse excitation voltage of the energy conversion module (4) triggers the ignition electrode pair (2a) to ignite the reaction chamber (2b), thereby driving the cutting-off mechanism (2c) to cut off the main circuit (1).

5. A circuit protection device as described in claim 2, characterized in that: The capacitor (5) is connected in series on one side of the sampling resistor (3b).

6. A circuit protection device as described in claim 1, characterized in that: The energy conversion module (4) includes a step-down isolation module (4b) and a pulse transformer module (4c). The two ends of the step-down isolation module (4b) and the pulse transformer module (4c) are connected in series and then connected in series to the two ends of the sampling module (3) and electrically connected to the circuit of the cut-off action device (2).

7. A circuit protection device as described in claim 2, characterized in that: The resistance value Rs of the sampling resistor (3b) is greater than 10 times the line impedance R0.

8. A circuit protection device as described in claim 4, characterized in that: The ignition electrode pair (2a) is a tungsten electrode pair.

9. A circuit protection device as described in claim 8, characterized in that: The tungsten electrode pair has a diameter of 0.5 mm and a tip curvature radius of 50 μm.

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