Interference magnetic field detection device

Abstract

The utility model provides an interference magnetic field detection device, comprising a power supply module used for supplying power to each module; the magnetic induction module comprises a first magnetic induction unit and a second magnetic induction unit which are arranged on the power equipment; the first magnetic induction unit is used for sensing the magnetic field intensity in the first magnetic induction space and generating a first sensing signal; the second magnetic induction unit is used for sensing the magnetic field intensity in the second magnetic induction space and generating a second sensing signal; a total magnetic induction space formed by the first magnetic induction space and the second magnetic induction space surrounds the power equipment; and the processing module is respectively connected with the first magnetic induction unit and the second magnetic induction unit, and is used for acquiring the first sensing signal and the second sensing signal, and detecting the interference magnetic field according to the first sensing signal and the second sensing signal, or detecting the interference magnetic field according to the first sensing signal. The interference magnetic field detection device provided by the utility model can accurately detect the surrounding interference magnetic field, and improves the detection accuracy of the interference magnetic field.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic field detection, in particular to an interference magnetic field detection device. Background Art

[0002] The interference magnetic field detection device is used to detect the magnetic field intensity around power equipment such as electric energy meters, and based on the detected magnetic field intensity value, judge whether the power equipment is affected by external magnetic field interference or attack and take corresponding protection measures to avoid the performance degradation of the power equipment due to the influence of the external interference magnetic field, such as inaccurate metering of the electric energy meter, reduced efficiency of the transformer, etc., so as to ensure the normal operation of the power equipment.

[0003] The existing interference magnetic field detection device senses the magnetic field around the power equipment by setting a magnetic induction chip and obtains the magnetic field intensity value of the magnetic field. When the magnetic field intensity value is greater than a certain preset magnetic field intensity threshold, it is determined that the power equipment is affected by the magnetic field. Due to the influence of the distance between the magnetic field source and the magnetic induction chip on the detection ability of the magnetic induction chip for the magnetic field intensity, the existing interference magnetic field detection device can only detect the local interference magnetic field near the power equipment, and cannot accurately detect the global interference magnetic field around the power equipment. For example, when the magnetic field source is located at the lower left of the electric energy meter and the magnetic induction chip is arranged at the upper right corner of the electric energy meter, the electric energy meter is within the magnetic field influence range of the electromagnetic source, while the magnetic induction chip is outside the magnetic field influence range of the electromagnetic source, resulting in the magnetic field intensity value sensed by the magnetic induction chip being lower than the preset interference magnetic field intensity threshold, and the accuracy of detecting the interference magnetic field around power equipment such as electric energy meters is relatively low, and the normal operation of the power equipment cannot be guaranteed.

[0004] Based on this, there is an urgent need for an interference magnetic field detection device that can accurately detect external interference magnetic fields. Summary of the Utility Model

[0005] In view of the above-mentioned disadvantages of the prior art, the purpose of the present utility model is to provide an interference magnetic field detection device, which is used to solve the problem that the existing interference magnetic field detection device can only accurately detect the local interference magnetic field near the power equipment, and cannot accurately detect the global interference magnetic field around the power equipment.

[0006] To achieve the above purpose and other related purposes, the present utility model provides an interference magnetic field detection device, and the device includes:

[0007] A power supply module for supplying power to each module;

[0008] The magnetic induction module includes a first magnetic induction unit and a second magnetic induction unit; the first magnetic induction unit is disposed at a first position on the outer surface of the power device, and is used to sense the magnetic field strength in the first magnetic induction space and generate a first sensing signal; the second magnetic induction unit is disposed at a second position on the outer surface of the power device, and is used to sense the magnetic field strength in the second magnetic induction space and generate a corresponding second sensing signal; the total magnetic induction space formed by the first magnetic induction space and the second magnetic induction space surrounds the power device.

[0009] The processing module is respectively connected to the first magnetic induction unit and the second magnetic induction unit, and is used to obtain the first sensing signal and the second sensing signal, and detect whether there is an interfering magnetic field around the power device according to the first sensing signal and the second sensing signal; or, detect whether there is an interfering magnetic field around the power device according to the first sensing signal.

[0010] In an embodiment of the present invention, the magnetic induction module includes: one first magnetic induction unit and at least one second magnetic induction unit.

[0011] In an embodiment of the present invention, the first magnetic induction unit includes: a 3D magnetic sensor.

[0012] In an embodiment of the present invention, the first magnetic induction unit further includes: a first resistor, a second resistor and a first capacitor; the 3D magnetic sensor has an SCL terminal, an SDA terminal, a VDD terminal and a GND terminal; wherein,

[0013] The VDD terminal of the 3D magnetic sensor is connected to the power supply module; the SCL terminal of the 3D magnetic sensor is connected to one end of the first resistor, and the other end of the first resistor is respectively connected to the processing module and the power supply module; the SDA terminal of the 3D magnetic sensor is connected to one end of the second resistor, and the other end of the second resistor is respectively connected to the processing module and the power supply module; one end of the first capacitor is connected to the common connection terminal of the processing module and the power supply module, and the other end is connected to the common connection terminal of the VDD terminal of the 3D magnetic sensor and the processing module; the GND terminal of the 3D magnetic sensor is grounded.

[0014] In an embodiment of the present invention, the second magnetic induction unit includes: a Hall effect sensor.

[0015] In an embodiment of the present invention, the second magnetic induction unit further includes: a third resistor, a second capacitor and a third capacitor; the Hall effect sensor has a VDD terminal, a GND terminal and a VOUT terminal; wherein,

[0016] The VDD terminal of the Hall effect sensor is respectively connected to the power supply module, one end of the third resistor, and one end of the second capacitor; the other end of the third resistor is connected to the VOUT terminal of the Hall effect sensor; the other end of the second capacitor is grounded; the common connection terminal of the VOUT terminal of the Hall effect sensor and the third resistor is connected to the processing module; one end of the third capacitor is connected to the VOUT terminal of the Hall effect sensor, and the other end is connected to the GND terminal of the Hall effect sensor; the GND terminal of the Hall effect sensor is grounded.

[0017] In an embodiment of the present invention, the second magnetic induction unit includes: a switch-type Hall effect sensor.

[0018] In an embodiment of the present invention, the device further includes: an alarm module, connected to the processing module, for receiving the alarm signal sent by the processing module to correspondingly emit an alarm message.

[0019] In an embodiment of the present invention, the processing module includes: an MCU.

[0020] In an embodiment of the present invention, the processing module has an IIC interface, and the processing module is connected to the first magnetic induction unit through the IIC interface.

[0021] A magnetic interference detection device provided by the present invention has at least the following beneficial effects:

[0022] By arranging the first magnetic induction unit and the second magnetic induction unit respectively disposed on the power equipment, so that the power equipment is located in the total magnetic induction space formed by the first magnetic induction unit and the second magnetic induction unit; and, by setting a processing module to obtain the first magnetic field intensity value sensed by the first magnetic induction unit and the second sensing signal generated by the second magnetic induction unit, to detect whether there is a magnetic interference around the power equipment based on the first magnetic field intensity value and the second sensing signal; or, to detect whether there is a magnetic interference around the power equipment based on the first magnetic field intensity value, the device realizes the detection of the global magnetic interference around the power equipment and improves the accuracy of detecting the magnetic interference around the power equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It shows a structural schematic diagram of a magnetic interference detection device provided by the present invention in an embodiment.

[0024] Figure 2 It shows a layout schematic diagram of the first magnetic induction unit and the second magnetic induction unit provided by the present invention in the first embodiment.

[0025] Figure 3 It shows the layout schematic diagram of the first magnetic induction unit and the second magnetic induction unit provided by the present utility model in the second embodiment.

[0026] Figure 4 It shows the layout schematic diagram of the first magnetic induction unit and the second magnetic induction unit provided by the present utility model in the third embodiment.

[0027] Figure 5 It shows the structural schematic diagram of the first magnetic induction unit provided by the present utility model in an embodiment.

[0028] Figure 6 It shows the structural schematic diagram of the second magnetic induction unit provided by the present utility model in an embodiment.

[0029] Figure 7 It shows the structural schematic diagram of the interference magnetic field detection device provided by the present utility model in another embodiment

[0030] Explanation of the reference numerals in the drawings

[0031] 1 Interference magnetic field detection device

[0032] 11 Power supply module

[0033] 12 Magnetic induction module

[0034] 121 First magnetic induction unit

[0035] 122 Second magnetic induction unit

[0036] 13 Processing module

[0037] 14 Alarm module

[0038] U1 3D magnetic sensor

[0039] U2 Hall effect sensor

[0040] C1 First capacitor

[0041] C2 Second capacitor

[0042] C3 Third capacitor

[0043] R1 First resistor

[0044] R2 Second resistor

[0045] R3 Third resistor Detailed implementation manners

[0046] The following specific examples illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model.

[0047] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limited conditions for the implementation of the present utility model. Therefore, they do not have substantial technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration and are not used to limit the scope for the implementation of the present utility model. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present utility model can be implemented.

[0048] The following will combine with the drawings to detail the embodiments of the present application. Without conflict, the features in the following embodiments and implementation manners can be combined with each other.

[0049] The present application relates to an interference magnetic field detection device. By arranging a first magnetic induction unit and a second magnetic induction unit respectively disposed on an electrical device, the electrical device is located within the total magnetic induction space formed by the first magnetic induction unit and the second magnetic induction unit; and, by arranging a processing module to obtain the first magnetic field intensity value sensed by the first magnetic induction unit and the second sensing signal generated by the second magnetic induction unit, to detect whether there is an interference magnetic field around the electrical device based on the first magnetic field intensity value and the second sensing signal; or, to detect whether there is an interference magnetic field around the electrical device based on the first magnetic field intensity value. The device realizes the detection of the global interference magnetic field around the electrical device, and improves the accuracy of detecting the interference magnetic field around the electrical device.

[0050] Please refer to Figure 1 , which shows the overall structural schematic diagram of an interference magnetic field detection device provided by the present utility model in an embodiment;

[0051] As Figure 1 shown, the interference magnetic field detection device 1 provided by the present utility model is used to detect the interference magnetic field around an electrical device. The device 1 includes: a power supply module 11, a magnetic induction module 12, and a processing module 13; wherein,

[0052] The power supply module 11 is respectively connected to the magnetic induction module 12 and the processing module 13, and is used to supply power to the magnetic induction module 12 and the processing module 13.

[0053] The magnetic induction module 12 includes a first magnetic induction unit 121 and a second magnetic induction unit 122; the first magnetic induction unit 121 is arranged at a first position on the outer surface of the power device, and is used to sense the magnetic field strength in the first magnetic induction space and generate a first sensing signal; the second magnetic induction unit 122 is arranged at a second position on the outer surface of the power device, and is used to sense the magnetic field strength in the second magnetic induction space and generate a corresponding second sensing signal; the total magnetic induction space formed by the first magnetic induction space and the second magnetic induction space surrounds the power device; the first sensing signal includes three-dimensional magnetic field strength values; the second sensing signal is a high-level signal or a low-level signal.

[0054] The processing module 13 is respectively connected to the first magnetic induction unit 121 and the second magnetic induction unit 122, and is used to obtain the first sensing signal and the second sensing signal, and detect whether there is an interfering magnetic field around the power device according to the first sensing signal and the second sensing signal; or, detect whether there is an interfering magnetic field around the power device according to the first sensing signal.

[0055] Specifically, when the interfering magnetic field detection device 1 is in a working state, the power supply module 11 supplies power to the magnetic induction module 12 and the processing module 13 respectively, and the first magnetic induction unit 121 and the second magnetic induction unit in the magnetic induction module 12 respectively sense the interfering magnetic field around the power device in real time; the first magnetic induction unit 121 generates a first sensing signal based on the first magnetic field strength value it senses, and sends the first sensing signal to the processing module 13; the second magnetic induction unit 122 generates a second sensing signal based on the second magnetic field strength value it senses, and sends the second sensing signal to the processing module 13; the processing module 13 extracts the first magnetic field strength value in the first sensing signal, and detects whether there is an interfering magnetic field around the power device based on the first magnetic field strength value and the second sensing signal; or, the processing module 13 detects whether there is an interfering magnetic field around the power device based on the first magnetic field strength value.

[0056] Optionally, the magnetic induction module includes one first magnetic induction unit 121 and several second magnetic induction units 122; the total number of the first magnetic induction unit 121 and the second magnetic induction units 122 is not greater than the total number of vertices on the first outer surface of the power device, and the first magnetic induction unit 121 and the second magnetic induction units 122 are respectively arranged at positions close to different vertices on the first outer surface;

[0057] Wherein, the first outer surface of the power device is the surface of the power device facing away from its mounting surface.

[0058] Please refer to Figure 2 , which shows a layout schematic diagram of the first magnetic induction unit and the second magnetic induction unit provided by the present application in the first embodiment;

[0059] Exemplarily, as Figure 2 shown, the first outer surface of the power device 2 has four vertices, and the magnetic induction module 12 includes one first magnetic induction unit 121 and three second magnetic induction units 122; the first magnetic induction unit 121 is arranged in the upper right corner of the power device 2; each of the second magnetic induction units 122 is respectively arranged at a position close to other vertices on the first outer surface of the power device 2; in this embodiment, when the interference magnetic field is in the upper right corner direction of the power device 2, the interference magnetic field detection device 1 can accurately detect the interference magnetic field based on the first magnetic field intensity value sensed by the first magnetic induction unit 121. When the interference magnetic field is in other directions of the power device 2, the interference magnetic field detection device 1 can accurately detect the interference magnetic field in other directions based on the second sensing signals sent by each of the second magnetic induction units 122 and the first magnetic field intensity value sensed by the first magnetic induction unit 121; and when the interference magnetic field is in the lower left corner direction of the power device 2, the interference magnetic field detection device 1 can still combine the signals sent by the second magnetic induction unit 122 in the lower left corner and the first magnetic induction unit 121 to accurately detect the interference magnetic field in the lower left corner direction.

[0060] Optionally, the number of both the first magnetic induction unit 121 and the second magnetic induction units 122 is 1, and the first magnetic induction unit 121 and the second magnetic induction units 122 are respectively arranged at the positions with the farthest distance on the first outer surface of the power device 2;

[0061] Please refer to Figure 3 , which shows a layout schematic diagram of the first magnetic induction unit and the second magnetic induction unit provided by the present application in the second embodiment;

[0062] Exemplarily, as Figure 3As shown, the first outer surface of the power device 2 has four vertices. The magnetic induction module 12 includes one first magnetic induction unit 121 and one second magnetic induction unit 122. The first magnetic induction unit 121 and the second magnetic induction unit 122 are respectively arranged at the upper right corner and the lower left corner of the first outer surface of the power device 2. In this embodiment, by arranging one first magnetic induction unit 121 and one second magnetic induction unit 122 at the two positions with the farthest distance on the first outer surface of the power device, the interference magnetic field detection device 1 can reduce the production cost of the interference magnetic field detection device while achieving accurate detection of the interference magnetic field around the power device 2.

[0063] Optionally, the magnetic induction module includes one first magnetic induction unit 121 and several second magnetic induction units 122. The total number of the second magnetic induction units 122 is equal to the total number of vertices on the first outer surface of the power device. The first magnetic induction unit is arranged at the center position of the first outer surface. Each of the second magnetic induction units is respectively arranged at a position close to each vertex on the first outer surface.

[0064] Please refer to Figure 4 , which shows the layout schematic diagram of the first magnetic induction unit and the second magnetic induction unit provided in the third embodiment of the present application;

[0065] Exemplarily, as Figure 4 shown, the first outer surface of the power device 2 has four vertices. The magnetic induction module 12 includes one first magnetic induction unit 121 and four second magnetic induction units 122. In this embodiment, the first magnetic induction unit 121 is arranged at the center position of the first outer surface of the power device 2. Each of the second magnetic induction units 122 is respectively arranged at a position close to each vertex on the first outer surface of the power device 2. In this embodiment, the interference magnetic field detection device 1 can accurately detect the interference magnetic field in each direction based on the second sensing signals sent by each of the second magnetic induction units 122 and the first magnetic field intensity value sensed by the first magnetic induction unit 121.

[0066] Optionally, the first magnetic induction unit 121 includes: a 3D magnetic sensor. In this embodiment, by arranging a 3D magnetic sensor in the first magnetic induction module 121, the magnetic field intensity in three dimensions can be sensed, so as to combine with the second magnetic induction unit 122 to detect the interference magnetic field around the power device.

[0067] Exemplarily, the 3D magnetic sensor is a TLV493D-A1B6 chip.

[0068] Please refer to Figure 5, showing a schematic structural diagram of the first magnetic induction unit provided by the present application in an embodiment;

[0069] As Figure 5 shown, the first magnetic induction unit 121 provided by the present application includes: a 3D magnetic sensor U1, a first resistor R1, a second resistor R2, and a first capacitor C1; the 3D magnetic sensor U1 has an SCL terminal, an SDA terminal, a VDD terminal, and a GND terminal; wherein,

[0070] The VDD terminal of the 3D magnetic sensor U1 is connected to the power supply module 11; the SCL terminal of the 3D magnetic sensor U1 is connected to one end of the first resistor R1, and the other end of the first resistor R1 is respectively connected to the processing module 13 and the power supply module 11; the SDA terminal of the 3D magnetic sensor U1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is respectively connected to the processing module 13 and the power supply module 11; one end of the first capacitor C1 is connected to the common connection terminal of the processing module 13 and the power supply module 11, and the other end is connected to the common connection terminal of the VDD terminal of the 3D magnetic sensor U1 and the processing module 13; the GND terminal of the 3D magnetic sensor U1 is grounded.

[0071] In a specific embodiment, the 3D magnetic sensor U1 transmits data to the processing module 13 through its SDA terminal; the 3D magnetic sensor U1 provides a clock signal to the processing module 13 through its SCL terminal to ensure synchronous transmission of data between the 3D magnetic sensor U1 and the processing module 13, improving the accuracy of signal transmission.

[0072] Optionally, the second magnetic induction unit 122 includes: a Hall effect sensor, etc.

[0073] Preferably, the second magnetic induction unit 122 includes: a switch-type Hall effect sensor; in this embodiment, the switch-type Hall effect sensor has high sensitivity and high precision. Setting the switch-type Hall effect sensor in the second magnetic induction unit 122 can provide a strict switching threshold (as small as 1 mT), thereby accurately providing a digital output signal of the magnetic field, and the switch-type Hall effect sensor is inexpensive, which can greatly reduce the production cost of the device 1.

[0074] Exemplarily, the Hall effect sensor is a TCS20DLR chip.

[0075] Please refer to Figure 6 , showing a schematic structural diagram of a second magnetic induction unit provided by the present application in an embodiment;

[0076] As Figure 6As shown, the second magnetic induction unit 122 provided by the present application includes: a Hall effect sensor U2, a third resistor R3, a second capacitor C2, and a third capacitor C3; the Hall effect sensor U2 has a VDD terminal, a GND terminal, and a VOUT terminal; wherein,

[0077] The VDD terminal of the Hall effect sensor U2 is respectively connected to the power supply module 11, one end of the third resistor R3, and one end of the second capacitor C2; the other end of the third resistor R3 is connected to the VOUT terminal of the Hall effect sensor U2; the other end of the second capacitor C2 is grounded; the common connection terminal of the VOUT terminal of the Hall effect sensor U2 and the third resistor R3 is connected to the processing module 13; one end of the third capacitor C3 is connected to the VOUT terminal of the Hall effect sensor U2, and the other end is connected to the GND terminal of the Hall effect sensor U2; the GND terminal of the Hall effect sensor U2 is grounded.

[0078] In a specific embodiment, the Hall effect sensor U2 sends the second sensing signal to the processing module 13 through its VOUT terminal.

[0079] Optionally, the power device 2 includes an electric meter and the like.

[0080] Optionally, the processing module 13 includes a microprocessor such as an MCU.

[0081] Optionally, the processing module 13 has an IIC interface, and the processing module 13 is connected to the first magnetic induction unit through the IIC interface; in this embodiment, the processing module 13 is connected to the first magnetic induction unit through the IIC interface, which can not only ensure the accuracy of data transmission, but also reduce the complexity of hardware connection and the power consumption of signal transmission.

[0082] In an implementation manner, the processing module 13 detects whether there is an interfering magnetic field around the power device 2 based on the first magnetic field strength value, including:

[0083] The processing module 13 determines whether there is a magnetic field strength value in any one-dimensional direction in the first magnetic field strength value that is greater than a preset first magnetic field strength threshold. If so, it is determined that there is an interfering magnetic field around the power device 2.

[0084] In an implementation manner, when the number of the first induction unit 121 and the second magnetic induction unit 122 is both 1, the processing module 13 detects whether there is an interfering magnetic field around the power device 2 based on the first magnetic field strength value and the second sensing signal, including:

[0085] The processing module 13 detects whether the second sensing signal is a low-level signal, and whether there is a magnetic field strength value in one of the dimensional directions in the first magnetic field strength values that is greater than the magnetic field strength values in the other two dimensional directions. If so, it is determined that there is an interfering magnetic field around the power device 2;

[0086] Wherein, when the magnetic field strength value sensed by the second magnetic induction unit 122 is greater than or equal to a preset second magnetic field strength threshold, the second sensing signal is a low-level signal; when the second magnetic field strength value sensed by the second magnetic induction unit 122 is less than the preset second magnetic field strength threshold, the second sensing signal is a high-level signal.

[0087] In another embodiment, when the number of the first magnetic induction units is 1 and the number of the second magnetic induction units 122 is greater than 1, the processing module 13 detects whether there is an interfering magnetic field around the power device 2 based on the first magnetic field strength value and the second sensing signal, including:

[0088] The processing module 13 detects whether there is at least one of the second sensing signals that is a low-level signal among the second sensing signals, and whether there is a magnetic field strength value in at least one of the dimensional directions in the first magnetic field strength values sent by the first magnetic induction unit 121 that is greater than the magnetic field strength values in the other dimensional directions. If so, it is determined that there is an interfering magnetic field around the power device 2.

[0089] Please refer to Figure 7 , which shows a schematic structural diagram of an interfering magnetic field detection device provided by the present application in another embodiment;

[0090] As Figure 7 shown, the interfering magnetic field detection device provided by the present application further includes: an alarm module 14; the alarm module 14 is respectively connected to the power supply module 11 and the processing module 13, and is configured to receive an alarm signal sent by the processing module 13 and send out an alarm message corresponding to the alarm signal.

[0091] Optionally, the alarm module 14 alarms by sound, light and / or short message.

[0092] A magnetic interference detection device provided in the above embodiments is configured to detect a magnetic interference around an electrical device by disposing a first magnetic induction unit and a second magnetic induction unit on the electrical device respectively, so that the electrical device is located within a total magnetic induction space formed by the first magnetic induction unit and the second magnetic induction unit; and by providing a processing module to obtain a first magnetic field intensity value sensed by the first magnetic induction unit and a second sensing signal generated by the second magnetic induction unit, to detect whether there is a magnetic interference around the electrical device based on the first magnetic field intensity value and the second sensing signal; or to detect whether there is a magnetic interference around the electrical device based on the first magnetic field intensity value. The device realizes the detection of global magnetic interference around the electrical device and improves the accuracy of detecting magnetic interference around the electrical device. Therefore, the utility model effectively overcomes various drawbacks in the prior art and has high industrial utilization value.

[0093] The above embodiments are only illustrative of the principles and effects of the utility model and are not intended to limit the utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the utility model should still be covered by the claims of the utility model.

Claims

1. An interference magnetic field detection device, characterized in that, For detecting the interference magnetic field around a power device, including: A power supply module for supplying power to each module; A magnetic induction module including a first magnetic induction unit and a second magnetic induction unit; the first magnetic induction unit is disposed at a first position on the outer surface of the power device for sensing the magnetic field intensity in a first magnetic induction space and generating a first sensing signal; the second magnetic induction unit is disposed at a second position on the outer surface of the power device for sensing the magnetic field intensity in a second magnetic induction space and generating a corresponding second sensing signal; the total magnetic induction space formed by the first magnetic induction space and the second magnetic induction space surrounds the power device; A processing module respectively connected to the first magnetic induction unit and the second magnetic induction unit, for acquiring the first sensing signal and the second sensing signal, and detecting whether there is an interference magnetic field around the power device according to the first sensing signal and the second sensing signal; or, detecting whether there is an interference magnetic field around the power device according to the first sensing signal.

2. The device according to claim 1, characterized in that, The magnetic induction module includes: one first magnetic induction unit and at least one second magnetic induction unit.

3. The device according to claim 1, wherein The first magnetic induction unit includes: a 3D magnetic sensor.

4. The device according to claim 3, characterized in that, The first magnetic induction unit further includes: a first resistor, a second resistor and a first capacitor; the 3D magnetic sensor has an SCL terminal, an SDA terminal, a VDD terminal and a GND terminal; wherein, the VDD terminal of the 3D magnetic sensor is connected to the power supply module; the SCL terminal of the 3D magnetic sensor is connected to one end of the first resistor, and the other end of the first resistor is respectively connected to the processing module and the power supply module; the SDA terminal of the 3D magnetic sensor is connected to one end of the second resistor, and the other end of the second resistor is respectively connected to the processing module and the power supply module; one end of the first capacitor is connected to the common connection terminal of the processing module and the power supply module, and the other end is connected to the common connection terminal of the VDD terminal of the 3D magnetic sensor and the processing module; The GND terminal of the 3D magnetic sensor is grounded.

5. The device according to claim 1, characterized in that, The second magnetic induction unit includes: a Hall effect sensor.

6. The device according to claim 5, characterized in that, The second magnetic induction unit further includes: a third resistor, a second capacitor and a third capacitor; the Hall effect sensor has a VDD terminal, a GND terminal and a VOUT terminal; wherein, the VDD terminal of the Hall effect sensor is respectively connected to the power supply module, one end of the third resistor and one end of the second capacitor; the other end of the third resistor is connected to the VOUT terminal of the Hall effect sensor; the other end of the second capacitor is grounded; the common connection terminal of the VOUT terminal of the Hall effect sensor and the third resistor is connected to the processing module; one end of the third capacitor is connected to the VOUT terminal of the Hall effect sensor, and the other end is connected to the GND terminal of the Hall effect sensor; the GND terminal of the Hall effect sensor is grounded.

7. The device according to claim 5 or 6, characterized in that, The second magnetic induction unit includes: a switch-type Hall effect sensor.

8. The device according to claim 1, characterized in that, The device further includes: an alarm module connected to the processing module for receiving the alarm signal sent by the processing module to correspondingly send out an alarm message.

9. The device according to claim 1, wherein The processing module includes: an MCU.

10. The device according to claim 1, characterized in that The processing module has an IIC interface, and the processing module is connected to the first magnetic induction unit through the IIC interface.

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