Magnetic induction excitation circuit protection device

Abstract

The utility model discloses a magnetic induction excitation 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, and a magnetic induction assembly is connected in series on the at least one main loop and is located at one side of the cut-off action device. The two ends of the magnetic induction assembly are electrically connected to the cut-off action device to form a signal loop, and the normally open type reed switch and the energy storage capacitor are sequentially connected to the input end of the magnetic induction assembly in series and electrically connected to the loop of the cut-off action device. A main loop is used for taking electricity (passivity), and a magnetic field is generated by utilizing the current change of the main loop to control a normally open reed switch, so that a fusing mechanism is triggered. The whole protection circuit is not interfered by external conditions, and the reliability of the circuit protection device is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of switch technology, specifically relating to a circuit protection device for magnetic induction excitation. 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 of fuses relies on external current / voltage sensors for signal acquisition, requires MCU control system for logic judgment, and active systems must be continuously powered by external power to maintain operation. The emergency protection response time is limited by the stability of the external power supply. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of the prior art, which relies on external current / voltage sensors for signal acquisition, requires MCU control system for logic judgment, and necessitates continuous external power supply in active systems, with emergency protection response time limited by the stability of external power supply. This invention provides a magnetic induction-excited circuit protection device that draws power from the main circuit (passive), uses the current change in the main circuit itself to generate a magnetic field to control a permanently open reed switch, thereby triggering the fuse mechanism.

[0005] Technical solution

[0006] To achieve the above-mentioned technical objectives, this utility model provides a circuit protection device for magnetic induction excitation, including at least one main circuit, a cut-off action device connected in series on the at least one main circuit, a magnetic induction component disposed on the main circuit and located on one side of the cut-off action device, the cut-off action device having a signal circuit electrically connected to both sides of the magnetic induction component, and a normally open reed switch and an energy storage capacitor connected in series in the signal circuit of the cut-off action device.

[0007] Preferably, an input terminal and an output terminal are respectively provided at both ends of the at least one main circuit, and a busbar is connected in series on the at least one main circuit.

[0008] Preferably, when the current in at least one main circuit is greater than or equal to the threshold current, the magnetic field generated by the magnetic induction component can cause the normally open reed switch to close to conduct the signal circuit.

[0009] Preferably, the magnetic induction component includes a magnetic ring surrounding the conductive busbar and a magnetic field concentration pole piece.

[0010] Preferably, the main circuit current I and the magnetic induction intensity B in the magnetic induction component satisfy: B=μ0μr·N·I / (2πr).

[0011] Preferably, the normally open reed switch actuation threshold I = (2πr·B) / (μ0μr·N).

[0012] Preferably, the cutting-off device includes an ignition device or ignition tube connected to the output terminal of the signal circuit, which can be triggered to explode when the signal circuit is turned on, thereby pushing the cutting-off mechanism to cut off the main circuit.

[0013] A circuit system comprising: a circuit protection device for magnetic induction excitation as described in any of the preceding claims.

[0014] Beneficial effects

[0015] This invention provides a magnetically inductively excited circuit protection device, comprising at least one main circuit, with a disconnection device connected in series on the main circuit. A magnetic induction component is connected in series on the main circuit, located on one side of the disconnection device. The two ends of the magnetic induction component are electrically connected to the disconnection device to form a signal circuit. A normally open reed switch and a storage capacitor are sequentially connected in series at the input end of the magnetic induction component and electrically connected to the circuit of the disconnection device. Power is drawn from the main circuit (passive operation), and the current change in the main circuit itself generates a magnetic field to control the normally open reed switch, thereby triggering a fuse mechanism. The entire protection circuit is unaffected by external conditions, ensuring the reliability of the circuit protection device. Attached Figure Description

[0016] 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.

[0017] Appendix Figure 1 This is a connection diagram of Embodiment 1 of this utility model;

[0018] Appendix Figure 2 This is a connection diagram of Embodiment 2 of this utility model;

[0019] Appendix Figure 3 This is a connection diagram of Embodiment 3 of this utility model. Detailed Implementation

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] Example 1

[0026] As attached Figure 1As shown, a circuit protection device for magnetic induction excitation includes at least one main circuit 1, a cut-off action device 2 connected in series on the at least one main circuit 1, a magnetic induction component 3 connected in series on the at least one main circuit 1 located on one side of the cut-off action device 2, the two ends of the magnetic induction component 3 being electrically connected to the cut-off action device 2 to form a signal circuit 4, and a normally open reed switch 5 and an energy storage capacitor 6 being connected in series on the input end of the magnetic induction component 3 and electrically connected to the circuit of the cut-off action device 2.

[0027] Specifically, at least one main circuit 1 has an input terminal 7 and an output terminal 8 at both ends, and a conductive busbar 9 is connected in series with the at least one main circuit 1. The magnetic induction component 3 includes a magnetic ring 3a and a magnetic field concentration pole piece 3b surrounding the conductive busbar 9. The main circuit current I and the magnetic induction intensity B in the magnetic induction component 3 satisfy: B = μ0μr·N·I / (2πr). The operating threshold of the normally open reed switch 5 is I = (2πr·B) / (μ0μr·N). Where μ0 is the permeability of free space, μr is the relative permeability of the magnetic ring, N is the number of turns of the winding, and r is the radius of the magnetic ring.

[0028] The cutting-off device 2 includes an ignition device or ignition tube 2b. The output end of the signal circuit 4 is connected to the ignition device or ignition tube 2b. The magnetic induction component 3 can generate a magnetic field to cause the normally open reed switch 5 to act and transmit a trigger signal to ignite the ignition device or ignition tube 2b, thereby pushing the cutting-off mechanism 2c to cut off the main circuit 1.

[0029] The working principle of this embodiment is as follows: When the main circuit current exceeds the set threshold, the magnetic ring 3a surrounding the conductive busbar 9 generates a magnetic field, which reaches the action threshold of the normally open reed switch 5. The normally open reed switch 5 contacts close (action time ≤ 2ms), the signal circuit closes, and the trigger voltage signal is transmitted to ignite the ignition device or ignition tube 2b of the gas generator, thereby pushing the cutting mechanism 2c. Specifically, the piston rod in the cutting action device moves to cut off the main circuit 1.

[0030] This invention provides a magnetically induction-excited circuit protection device. Power is drawn from the main circuit (passive), and the current change in the main circuit itself generates a magnetic field to control a normally open reed switch, thereby triggering a fuse mechanism. The entire protection circuit is unaffected by external conditions, ensuring the reliability of the circuit protection device.

[0031] Example 2

[0032] In embodiment 2, the magnetic induction component 3 can be a spiral main circuit coil, and the normally open reed switch can be directly sleeved inside the main circuit coil. The magnetic induction component can also be a magnetic ring type as in embodiment 1, in which case the magnetic ring is directly wrapped around the main circuit, and the normally open reed switch is placed next to the magnetic ring.

[0033] Example 3

[0034] Based on Example 1, a magnetic shielding ring 51 is added. Its function is to avoid the influence of external magnetic fields on the normally open reed switch and improve the stability of the system.

[0035] Furthermore, an adjustable support plate 52 is added. Its function is to allow the support plate to move up and down, thereby controlling the distance between the normally open reed switch and the busbar, achieving an adjustable protection factor. This allows for the independent setting or adjustment of the threshold value at which the main circuit will be cut off, thus protecting the main circuit load.

[0036] 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.

[0037] 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 for magnetic induction excitation, characterized in that: It includes at least one main circuit (1), on which a cutting action device (2) is connected in series. A magnetic induction component (3) is disposed on the main circuit and located on one side of the cutting action device (2). The cutting action device is provided with a signal circuit (4) electrically connected to both sides of the magnetic induction component (3). A normally open reed switch (5) and an energy storage capacitor (6) are connected in series on the signal circuit (4) of the cutting action device.

2. The circuit protection device for magnetic induction excitation as described in claim 1, characterized in that: An input terminal (7) and an output terminal (8) are respectively provided at both ends of the at least one main circuit (1), and a conductive bus (9) is connected in series on the at least one main circuit (1).

3. The circuit protection device for magnetic induction excitation as described in claim 1, characterized in that: When the current in at least one main circuit (1) is greater than or equal to the threshold current, the magnetic field generated by the magnetic induction component (3) can cause the normally open reed switch (5) to close to conduct the signal circuit (4).

4. The circuit protection device for magnetic induction excitation as described in claim 2, characterized in that: The magnetic induction component (3) includes a magnetic ring (3a) surrounding the conductive busbar (9) and a magnetic field concentration pole piece (3b).

5. The circuit protection device for magnetic induction excitation as described in claim 1, characterized in that: The main circuit current I and the magnetic induction intensity B in the magnetic induction component (3) satisfy: B=μ0μr·N·I / (2πr).

6. The circuit protection device for magnetic induction excitation as described in claim 1, characterized in that: The normally open reed switch (5) has an action threshold I = (2πr·B) / (μ0μr·N).

7. The circuit protection device for magnetic induction excitation as described in claim 1, characterized in that: The cutting-off device (2) includes an ignition device or ignition tube (2b) connected to the output end of the signal circuit (4), which can be triggered to explode when the signal circuit (4) is turned on, thereby pushing the cutting-off mechanism (2c) to cut off the main circuit (1).

8. A circuit system, characterized in that, The circuit system includes: the circuit protection device for magnetic induction excitation as described in any one of claims 1-7.

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