Magnetic field detection smart fuse

Abstract

This utility model relates to the technical field of intelligent fuses, and discloses a magnetic field detection type intelligent fuse, including a control board, an initiator, a conductor, and a magnetic field sensor. The magnetic field sensor and the initiator are electrically connected to the control board. Current flows through the conductor to generate a reference magnetic field. The magnetic field sensor detects the magnetic field strength of the reference magnetic field and feeds it back to the control board. The control board has a preset cutting threshold and outputs a cutting command to the initiator based on the cutting threshold. The initiator cuts off the circuit based on the cutting command. In use, the magnetic field sensor monitors the current value of the conductor and feeds it back to the control board. The control board compares the conductor current received with the preset rated current. When the conductor current exceeds the rated current, the control board controls the initiator to start, cutting off the conductor circuit through the initiator, thus achieving overload protection and effectively protecting the circuit.

Description

Technical Field

[0001] This utility model patent relates to the technical field of intelligent fuses, and more specifically, to a magnetic field detection type intelligent fuse. Background Technology

[0002] Intelligent fuses, which can be externally driven to cut off the main circuit based on the magnitude of the fault current and can complete the disconnection action within a few milliseconds, have seen rapid development in the field of new energy applications.

[0003] For example, the prior patent with authorization announcement number CN215944309U discloses an intelligent fuse-type electronic monitoring device, including a main control board, an accelerometer, a gyroscope, and a disconnector. The accelerometer, gyroscope, and disconnector are respectively arranged in a circuit connection with the main control board. The accelerometer is used to detect acceleration force, and the gyroscope is used to measure angular velocity. When the measurement by the accelerometer or gyroscope exceeds a threshold, the disconnector cuts off the power supply to the electronic device.

[0004] In the existing technology, the monitoring and disconnection of the circuit is achieved by using an accelerometer and a gyroscope sensor in conjunction with a disconnector. However, this method is susceptible to pulse current, which can lead to monitoring failure and poor stability. Furthermore, the monitoring accuracy and controllability are also insufficient. Utility Model Content

[0005] The purpose of this invention is to provide a magnetic field detection type intelligent fuse, which aims to solve the problems of insufficient monitoring accuracy and controllability of existing intelligent fuses.

[0006] This invention is implemented as follows: a magnetic field detection type intelligent fuse includes a control board, an initiator, a conductor, and a magnetic field sensor. The magnetic field sensor and the initiator are electrically connected to the control board. Current flows through the conductor to generate a reference magnetic field. The magnetic field sensor is used to detect the magnetic field strength of the reference magnetic field and feed it back to the control board. The control board has a preset cutting threshold and is used to output a cutting command to the initiator based on the cutting threshold. The initiator is used to cut off the circuit based on the cutting command.

[0007] Furthermore, the conductor includes a copper busbar, which is arranged in series with the main circuit. The copper busbar is used to supply current and generate the reference magnetic field, and the magnetic field sensor is used to detect the magnetic field strength generated by the copper busbar.

[0008] Furthermore, the conductor includes a wire assembly arranged in series with the main circuit. The wire assembly is used to allow current to pass through and generate the reference magnetic field. The magnetic field sensor is used to detect the magnetic field strength generated by the wire assembly.

[0009] Furthermore, the magnetic field detection type intelligent fuse includes a fuse shell, and the two ends of the conductor extend to the outside of the fuse shell to form conductive parts, which are arranged in communication with the main circuit; the control board, the magnetic field sensor and the detonator are respectively installed in the fuse shell, and the magnetic field sensor is arranged correspondingly to the conductor.

[0010] Furthermore, the fuse housing includes an external interface for connecting an external power supply or an external input signal. The external interface is connected to the control board. A connector or wire is fitted into the external interface. The connector or wire is used for power supply or external input signal.

[0011] Furthermore, the detonator includes a detonating body and a cutting head, the detonating body and the cutting head are assembled together, and the detonating body is used to push the cutting head to move; the conductor has a weak portion, the weak portion is thin, the cutting head is arranged correspondingly to the weak portion, and the cutting head is used to cut the weak portion under a thrust.

[0012] Furthermore, the magnetic field detection type intelligent fuse includes a fuse shell with an arc-extinguishing cavity. The arc-extinguishing cavity is arranged with a top opening. The conductor covers the top opening of the arc-extinguishing cavity, and the weak part is arranged directly opposite the arc-extinguishing cavity. The weak part is subjected to a thrust and is cut off, falling into the arc-extinguishing cavity. The arc-extinguishing cavity generates an electric arc. The interior of the arc-extinguishing cavity is provided with multiple metal wires, which are used to cool and extinguish the electric arc generated by the weak part. Alternatively, the interior of the arc-extinguishing cavity is provided with a magnetic coil or a permanent magnet, which is used to generate magnetic force to extinguish the electric arc generated by the weak part.

[0013] Furthermore, the detonator includes a Hall switch with a sensing element made of semiconductor material. The sensing element is used to detect the potential difference caused by changes in the magnetic field, and the measurement of the potential difference can sense changes in the magnetic field strength.

[0014] Furthermore, the conductor includes a semiconductor material layer, and the magnetic field sensor acts on the semiconductor material layer based on the Hall effect principle. The semiconductor material layer generates a potential difference on both sides due to the Hall effect, and the magnetic field sensor can sense changes in magnetic field strength by measuring the potential difference.

[0015] Furthermore, the numerical range of the cutting threshold is 1000A-1400A, or the numerical value of the cutting threshold is 1200A.

[0016] Compared with the prior art, the magnetic field detection type intelligent fuse provided by this utility model uses a magnetic field sensor to monitor the current value of the conductor and feed it back to the control board. The control board compares the conductor current received with the preset rated current. When the conductor current exceeds the rated current, the control board controls the detonator to start, and the detonator cuts off the conductor circuit to achieve current overload protection and also effectively protect the circuit. Attached Figure Description

[0017] Figure 1 This is a cross-sectional schematic diagram of the magnetic field detection intelligent fuse provided by this utility model;

[0018] Figure 2 This is a three-dimensional schematic diagram of the magnetic field detection type intelligent fuse provided by this utility model. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] The implementation of this utility model will be described in detail below with reference to specific embodiments.

[0021] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0022] Reference Figure 1 and 2 The image shown is a preferred embodiment of the present invention.

[0023] The magnetic field detection type intelligent fuse includes a control board 1, an initiator 2, a conductor 3, and a magnetic field sensor 4. The magnetic field sensor 4 and the initiator 2 are electrically connected to the control board 1. Current flows through the conductor 3 to generate a reference magnetic field. The magnetic field sensor 4 is used to detect the magnetic field strength of the reference magnetic field and feed it back to the control board 1. The control board 1 has a preset cutting threshold and is used to output a cutting command to the initiator 2 based on the cutting threshold. The initiator 2 is used to cut off the circuit based on the cutting command.

[0024] In the above-mentioned magnetic field detection type intelligent fuse, when in use, the magnetic field sensor 4 monitors the current value of conductor 3 and feeds it back to the control board 1. The control board 1 compares the current of conductor 3 received with the preset rated current. When the current of conductor 3 exceeds the rated current, the control board 1 controls the detonator 2 to start, and the detonator 2 cuts off the conductor 3 circuit to achieve current overload protection and also effectively protect the circuit.

[0025] The magnetic field detection type intelligent fuse includes a fuse shell 7, and the two ends of the conductor 3 extend to the outside of the fuse shell 7 to form a conductive part, which is connected to the main circuit. The control board 1, the magnetic field sensor 4 and the detonator 2 are respectively installed on the fuse shell 7, and the magnetic field sensor 4 and the conductor 3 are arranged in a corresponding manner.

[0026] In this way, the fuse housing 7 facilitates the installation of the control board 1, the magnetic field sensor 4, and the detonator 2. It also facilitates the connection between the fuse and the circuit, as well as the assembly and monitoring of the fuse with automobiles and other devices.

[0027] The fuse housing 7 includes an external interface 6, which is used for external power supply or external input signal. The external interface 6 is connected to the control board 1. The connector or wire is adapted to be inserted into the external interface 6. The connector or wire is used for power supply or external input signal.

[0028] In this way, external power can be supplied through external interface 6 to power the fuse. At the same time, external input signals can be input through external interface 6 by plugging in connectors or wires, thereby enabling manual intervention to control the fuse.

[0029] The detonator 2 includes a detonating body and a cutting head, which are assembled together, and the detonating body is used to push the cutting head to move. The conductor 3 has a weak part, which is thin, and the cutting head is arranged corresponding to the weak part. The cutting head is used to cut the weak part under the thrust.

[0030] In this way, when the control board 1 detects that the current of conductor 3 exceeds the cutting threshold, it outputs a cutting command to the detonator 2. The detonator body applies a thrust to the cutting head, causing the cutting head to cut the weak part, thereby achieving the cutting of the circuit and completing the circuit protection.

[0031] The magnetic field detection type intelligent fuse includes a fuse shell 7, which has an arc-extinguishing cavity 5. The arc-extinguishing cavity 5 is arranged with a top opening. A conductor 3 covers the top opening of the arc-extinguishing cavity 5, and the weak part is arranged directly opposite to the arc-extinguishing cavity 5. The weak part is pushed into a cut state and falls into the arc-extinguishing cavity 5. The weak part generates an electric arc in the cut state. The arc-extinguishing cavity 5 is provided with multiple metal wires, which are used to cool and extinguish the electric arc generated by the weak part; or, the arc-extinguishing cavity 5 is provided with a magnetic coil or permanent magnet, which is used to generate magnetic force to extinguish the electric arc generated by the weak part.

[0032] In this way, the electric arc is generated by the weak part after the conductor 3 is broken. After the detonator 2 is working, the cutting head will push the weak part to the arc extinguishing chamber 5, and then the electric arc will come into contact with the arc extinguishing chamber 5 to reduce the arc temperature, thereby accelerating the extinction of the electric arc.

[0033] Conductor 3 includes a semiconductor material layer. Magnetic field sensor 4 acts on the semiconductor material layer based on the Hall effect principle. The semiconductor material layer generates a potential difference on both sides of the Hall effect. Magnetic field sensor 4 measures the potential difference to sense changes in magnetic field strength. This facilitates the detection of current in conductor 3 by magnetic field sensor 4.

[0034] The cut-off threshold ranges from 1000A to 1400A. Different cut-off threshold values ​​are configured according to the different products being tested to meet different cut-off protection requirements.

[0035] Alternatively, the cutoff threshold value can be 1200A. Depending on the specific product being tested, different cutoff threshold values ​​can be configured to meet different cutoff protection requirements.

[0036] Alternatively, the cutoff threshold value can be 1000A. Depending on the product being tested, different cutoff threshold values ​​can be configured to meet different cutoff protection requirements.

[0037] Alternatively, the cutoff threshold value can be 1400A. Different cutoff threshold values ​​can be configured according to different products being tested to meet different cutoff protection requirements.

[0038] The control board 1 is used to analyze and calculate the current in conductor 3 obtained by magnetic field sensor 4, and then compare it with the rated current defined by the product software. If the current in conductor 3 exceeds the rated current defined by the software, a signal is sent to start the detonator 2 and cut off the conductor 3 circuit, thereby realizing overcurrent protection.

[0039] Example 1 of conductor 3: Conductor 3 includes a copper busbar, which is arranged in series with the main circuit. The copper busbar is used to supply current and generate a reference magnetic field. The magnetic field sensor 4 is used to detect the magnetic field strength generated by the copper busbar.

[0040] In this way, the current passing through the copper busbar will generate a magnetic field, and the generated magnetic field is monitored and fed back to the control board 1 by the magnetic field sensor 4. The control board 1 calculates the current passing through the conductor 3 based on the preset calculation program. If it exceeds the cutting-off threshold, it directly controls the detonator 2 to cut off the circuit.

[0041] The phenomenon that the resistance of a copper busbar changes in a magnetic field is called the magnetoresistive effect. Different magnetic field strengths are generated when different currents pass through the copper busbar, thereby enabling the magnetic field sensor 4 to accurately detect the current in conductor 3.

[0042] Example 2 of conductor 3: Conductor 3 includes a wire group, which is arranged in series with the main circuit. The wire group is used to allow current to pass through and generate a reference magnetic field. The magnetic field sensor 4 is used to detect the magnetic field strength generated by the wire group.

[0043] In this way, the current passing through the conductor group will generate a magnetic field, and the generated magnetic field is monitored and fed back to the control board 1 by the magnetic field sensor 4. The control board 1 calculates the current passing through the conductor 3 based on the preset calculation program. If it exceeds the cutting threshold, it directly controls the detonator 2 to cut off the circuit.

[0044] The phenomenon that the resistance of a copper busbar changes in a magnetic field is called the magnetoresistive effect. Different magnetic field strengths are generated when different currents pass through the copper busbar, thereby enabling the magnetic field sensor 4 to accurately detect the current in conductor 3.

[0045] Another embodiment of the detonator 2: The detonator 2 includes a Hall switch, which has a sensing part made of semiconductor 3 material. The sensing part is used to detect the potential difference caused by the change in magnetic field. By measuring the potential difference, the change in magnetic field strength can be sensed. In this way, the current of conductor 3 can be monitored by the Hall switch. When the current of conductor 3 exceeds the rated current, the control board 1 controls the detonator 2 to start.

[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A magnetic field detection type intelligent fuse characterized by, The device includes a control board, a detonator, a conductor, and a magnetic field sensor. The magnetic field sensor and the detonator are electrically connected to the control board. Current flows through the conductor to generate a reference magnetic field. The magnetic field sensor detects the magnetic field strength of the reference magnetic field and feeds it back to the control board. The control board has a preset cutoff threshold and outputs a cutoff command to the detonator based on the cutoff threshold. The detonator cuts off the circuit based on the cutoff command.

2. The magnetic field sensing intelligent fuse of claim 1, wherein, The conductor includes a copper busbar, which is arranged in series with the main circuit. The copper busbar is used to supply current and generate the reference magnetic field. The magnetic field sensor is used to detect the magnetic field strength generated by the copper busbar.

3. The magnetic field sensing intelligent fuse of claim 1, wherein, The conductor includes a wire group arranged in series with the main circuit. The wire group is used to allow current to pass through and generate the reference magnetic field. The magnetic field sensor is used to detect the magnetic field strength generated by the wire group.

4. The magnetic field detection type intelligent fuse as described in claim 1, characterized in that, The magnetic field detection type intelligent fuse includes a fuse shell, and the two ends of the conductor extend to the outside of the fuse shell to form a conductive part, which is connected to the main circuit. The control board, the magnetic field sensor and the detonator are respectively installed in the fuse shell, and the magnetic field sensor is arranged correspondingly to the conductor.

5. The magnetic field detection type intelligent fuse as described in claim 4, characterized in that, The fuse housing includes an external interface for connecting an external power source or an external input signal. The external interface is connected to the control board. A connector or wire is fitted into the external interface. The connector or wire is used for power supply or external input signal.

6. The magnetic field detection type intelligent fuse as described in any one of claims 1-5, characterized in that, The detonator includes a detonating body and a cutting head, which are assembled together, and the detonating body is used to push the cutting head to move. The conductor has a weak portion, which is thin, and the cutting head is arranged corresponding to the weak portion. The cutting head is used to cut the weak portion under a thrust.

7. The magnetic field detection type intelligent fuse as described in claim 6, characterized in that, The magnetic field detection type intelligent fuse includes a fuse shell with an arc-extinguishing cavity. The arc-extinguishing cavity is arranged with a top opening. The conductor covers the top opening of the arc-extinguishing cavity, and the weak part is arranged directly opposite the arc-extinguishing cavity. The weak part is subjected to a thrust and is cut off, falling into the arc-extinguishing cavity. The arc-extinguishing cavity generates an electric arc. The interior of the arc-extinguishing cavity is provided with multiple metal wires, which are used to cool and extinguish the electric arc generated by the weak part; or, the interior of the arc-extinguishing cavity is provided with a magnetic coil or a permanent magnet, which is used to generate magnetic force to extinguish the electric arc generated by the weak part.

8. The magnetic field detection type intelligent fuse as described in any one of claims 1-5, characterized in that, The detonator includes a Hall switch with a sensing element made of semiconductor material. The sensing element is used to detect the potential difference caused by changes in the magnetic field, and the measurement of the potential difference can sense changes in the magnetic field strength.

9. The magnetic field detection type intelligent fuse as described in any one of claims 1-5, characterized in that, The conductor includes a semiconductor material layer. The magnetic field sensor acts on the semiconductor material layer based on the Hall effect principle. The semiconductor material layer generates a potential difference on both sides of the Hall effect. The magnetic field sensor can sense changes in magnetic field strength by measuring the potential difference.

10. The magnetic field detection type intelligent fuse as described in any one of claims 1-5, characterized in that, The value range of the cutoff threshold is 1000A-1400A, or the value of the cutoff threshold is 1200A.

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