Induction power pick-up device

Abstract

The application provides an inductive power taking device, which comprises a shell for penetrating a cable, the shell comprising two oppositely detachably arranged housings, the housings having oppositely arranged inner side walls and outer side walls, the two inner side walls abutting the surface of the cable; a power taking assembly arranged in each of the two housings, comprising a magnetic core and a plurality of coils, the magnetic core extending along the circumference of the through hole, the plurality of coils penetrating the magnetic core, and two adjacent coils being arranged at intervals; and a limiting piece, two limiting pieces being arranged in each accommodating cavity, the two limiting pieces being located at the two circumferentially arranged ends of the accommodating cavity, the limiting piece having a gap with the inner side wall, the two ends of the magnetic core being arranged one by one with the two limiting pieces, the end of the magnetic core being located in the gap, and the limiting piece being used for abutting the end of the magnetic core with the inner side wall. The technical scheme of the application can solve the problem of unstable output performance of the inductive power taking device in the small current mode in the prior art.

Description

Technical Field

[0001] This invention relates to the field of current induction power generation technology, and more specifically, to an induction power generation device. Background Technology

[0002] Currently, power cables are a crucial component of power transmission in power systems. However, existing cables may experience localized heating due to prolonged discharge. When the cable insulation decomposes under heat, it produces flammable gases, potentially causing fires along the cable lines. Current technology typically involves installing temperature monitoring equipment on the cables to monitor their temperature in real time, and using inductive power extraction devices to power the monitoring equipment.

[0003] According to the law of electromagnetic induction, in an inductive power harvesting device, the magnetic core and coil work together, with the magnetic core ring-shaped and fitted around the outside of the power cable, and the coil threaded through the magnetic core. Utilizing the alternating magnetic field surrounding the cable, the magnetic core and coil generate induced electrical energy, providing long-term power to the monitoring equipment and thus improving energy efficiency. However, existing 10000V and above high-voltage cables have insulation layers of sufficient thickness to meet safety requirements, and most high-voltage cables in the power transmission network have an outer diameter greater than 50mm. Inductive power harvesting devices for such power cables typically use a large-diameter, ring-shaped opening and closing structure. Under low-current conditions, the power harvesting performance of this type of inductive power harvesting device is extremely unstable, easily impacting maintenance and repair work in terms of manpower, material resources, and time costs. Summary of the Invention

[0004] This invention provides a fuel measurement device to solve the problem of unstable output performance of inductive power-generating devices in the prior art under low current mode.

[0005] According to the technical solution of the present invention, an inductive power-gathering device is provided, comprising: a housing, the housing having an annular structure, the inner ring of the housing having a through hole for passing through the through hole, the housing comprising two opposing housings detachably connected, the housing having opposing inner and outer sidewalls forming a receiving cavity between the inner and outer sidewalls, the inner sidewalls of the two housings cooperating to form the through hole, the two inner sidewalls abutting against the surface of the cable; a power-gathering assembly, respectively disposed in the two receiving cavities, the power-gathering assembly comprising a magnetic core and multiple coils, the magnetic core extending circumferentially along the through hole, the multiple coils passing through the magnetic core, adjacent coils being spaced apart; and limiting members, each receiving cavity having two limiting members disposed at both ends of the receiving cavity circumferentially, the two limiting members being respectively located at both ends of the receiving cavity, the limiting members having a gap with the inner sidewall, the two ends of the magnetic core corresponding to the two limiting members one-to-one, the end of the magnetic core being located within the gap, the limiting members being used to abut against the inner sidewall.

[0006] Furthermore, the limiting element is detachably mounted on the housing.

[0007] Furthermore, a slot is provided inside the receiving cavity, and the slot is arranged circumferentially at both ends of the receiving cavity. A protrusion is provided on the limiting member, and the protrusion is inserted and engaged with the slot to fix the limiting member on the housing.

[0008] Furthermore, the housing has an open end and a closed end arranged opposite to each other along the axial direction, and a mounting seat is provided in the receiving cavity. The mounting seat is disposed on the surface of the closed end. The mounting seat has a slot and a stop is also provided. The stop is disposed on one side of the slot near the circumferential end of the receiving cavity to limit the displacement of the protrusion toward the stop.

[0009] Furthermore, the slot has two spaced protrusions, the gap between the two protrusions is used to accommodate the protrusion, the height of the protrusion gradually increases from the direction away from the stop, the protrusion on the limiting member abuts and engages with the surface of the closed end, a limiting step is formed between the protrusion and the limiting member, the stepped surface of the limiting step engages with the end face of the protrusion away from the closed end to limit the displacement of the protrusion away from the stop.

[0010] Furthermore, the side of the limiting member facing the inner wall has a contact surface that abuts against the magnetic core. The cross-section of the contact surface along the extension direction of the limiting member is arc-shaped, and the center of the arc is located away from the inner wall.

[0011] Furthermore, the inductive power extraction device also includes a fixing plate, which is disposed inside the receiving cavity. The fixing plate is provided with multiple fixing blocks, which are corresponding to multiple coils. The fixing blocks are used to limit the position of the coils inside the receiving cavity.

[0012] Furthermore, the two housings are connected axially at one end by a hinge, and circumferentially at the other end by a snap-fit ​​connector.

[0013] Furthermore, the total number of turns of the multiple coils located in the two receiving cavities is 30,000-40,000.

[0014] Furthermore, the minimum distance between two adjacent coils located in the same receiving cavity is 5-25mm.

[0015] Furthermore, the inductive power extraction device also includes a control module, which includes: an energy extraction unit with a power extraction regulation and protection circuit, the energy extraction unit being electrically connected to the power extraction component; an energy storage unit with an energy storage capacitor, the energy storage unit being electrically connected to the energy extraction unit; an output unit being electrically connected to the energy extraction unit; a control unit being electrically connected to the energy extraction unit, the energy storage unit, and the output unit respectively; and a wiring terminal is provided on one of the two housings, the wiring terminal being electrically connected to the output unit.

[0016] By applying the technical solution of this invention, two limiting members are provided in each receiving cavity, which can ensure that the two ends of the magnetic core abut against the inner sidewall, making the ends of the magnetic core closer to the outer surface of the cable. This can optimize the power extraction effect of the power extraction component and enhance the output performance of the inductive power extraction device in low current mode. The inductive power extraction device provided by this application can make the most of the magnetic field around the cable, improve the power extraction effect, and thus provide stable power supply to the electrical equipment. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 An exploded view of the structure of an inductive power harvesting device provided according to an embodiment of the present invention is shown;

[0019] Figure 2 A cross-sectional view of an inductive power harvesting device provided according to an embodiment of the present invention is shown;

[0020] Figure 3 A schematic diagram of the structure of the housing provided according to an embodiment of the present invention is shown;

[0021] Figure 4 It shows Figure 3 A magnified view of a section at point A in the middle;

[0022] Figure 5 A schematic diagram of the structure of the limiting member provided according to an embodiment of the present invention is shown;

[0023] Figure 6 A schematic diagram of the closed state of the inductive power extraction device provided according to an embodiment of the present invention is shown;

[0024] Figure 7 A schematic diagram of the inductive power extraction device in its open state according to an embodiment of the present invention is shown;

[0025] Figure 8 A line graph showing the output voltage with different coil turns according to an embodiment of the present invention is shown;

[0026] Figure 9 A connection diagram of the control module provided according to an embodiment of the present invention is shown.

[0027] The above figures include the following reference numerals:

[0028] 100. Through hole;

[0029] 10. Outer shell; 11. Housing; 111. Inner wall; 112. Outer wall; 113. Receiving cavity; 14. Mounting base; 141. Stop; 142. Protrusion; 15. Cover plate;

[0030] 20. Power supply assembly; 21. Magnetic core; 22. Coil;

[0031] 30. Limiting element; 31. Protrusion; 32. Contact surface; 33. Limiting step;

[0032] 40. Fixing plate; 41. Fixing block;

[0033] 50. Snap-on connectors;

[0034] 60. Control module;

[0035] 70. Terminal blocks;

[0036] 80. Wiring hole. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Reference Figure 1 and Figure 2As shown, this embodiment of the invention provides an inductive power-gathering device, which includes a housing 10, a power-gathering component 20, and a limiting member 30. The housing 10 has an annular structure, with an inner ring forming a through hole 100 for threading a cable. The housing 10 includes two opposing shells 11 detachably connected. Each shell 11 has an opposing inner sidewall 111 and an outer sidewall 112, forming a receiving cavity 113 between them. The inner sidewalls 111 of the two shells 11 cooperate to form the through hole 100, and the two inner sidewalls 111 abut against the surface of the cable. The power-gathering component 20 is disposed within each of the two receiving cavities 113. The power-gathering component 20 includes a magnetic core 21 and multiple coils 22. The magnetic core 21 extends circumferentially along the through hole 100, and the multiple coils 22 pass through the magnetic core 21, with adjacent coils 22 spaced apart. Each receiving cavity 113 is provided with two limiting members 30. The two limiting members 30 are respectively located at both ends of the receiving cavity 113 along the circumferential direction. There is a gap between the limiting members 30 and the inner sidewall 111. The two ends of the magnetic core 21 are correspondingly provided with the two limiting members 30. The end of the magnetic core 21 is located in the gap. The limiting members 30 are used to make the end of the magnetic core 21 abut against the inner sidewall 111.

[0039] By applying the technical solution of the present invention, by providing two limiting members 30 in each receiving cavity 113, the limiting members 30 can be used to ensure that the two ends of the magnetic core 21 abut against the inner sidewall 111, so that the ends of the magnetic core 21 are closer to the outer surface of the cable. This can optimize the power taking effect of the power taking component 20 and enhance the output performance of the inductive power taking device in low current mode.

[0040] The inductive power extraction device provided in this application is suitable for non-invasive inductive power extraction from cables, especially three-core cables. This device maximizes the utilization of the magnetic field surrounding the cable, improving power extraction efficiency and thus providing stable power to electrical equipment. In this application, by setting two housings 11 together to form the outer shell 10, the two magnetic cores 21 are prevented from forming a closed loop, thus preventing them from simultaneously extracting three-phase power from the three-core cable. The phase difference between the three-phase currents of the three-core cable is 120°. The magnetic fields they generate are perpendicular to each other in space, equal in magnitude, and opposite in direction, resulting in a total magnetic field of zero. The magnetic fields are essentially canceled out outside the sheath of the three-core cable. By setting two sets of power extraction components 20, the magnetic field surrounding the three-core cable can be utilized for inductive power extraction, improving energy utilization efficiency.

[0041] Existing inductive power harvesting devices for three-core cables typically include multiple coils and a magnetic core. The coils are threaded through the magnetic core, which is then annularly fitted onto the outer surface of the cable. This results in close contact between the coils and the cable's outer surface, while a certain distance remains between the magnetic core and the cable's outer surface. This leads to insufficient utilization of the magnetic field. As shown in Table 1, tests were conducted using a neutral-point ungrounded three-phase system. The coils were all made of 0.05mm wire. A comparison was made between limiting and not limiting the magnetic core. Limiting the magnetic core resulted in an average 24.2% increase in the output voltage performance of the inductive power harvesting device, thus improving the magnetic field utilization efficiency.

[0042] Table 1: Comparison of test results with and without magnetic core limiting

[0043]

[0044] Reference Figures 3 to 5 As shown, in some specific embodiments of this application, the limiting member 30 is detachably disposed on the housing 11. Specifically, in this application, during the assembly of the inductive power-taking device, the power-taking component 20 is first placed in the receiving cavity 113, and then the limiting member 30 is installed. This ensures that while the two ends of the magnetic core 21 are in close contact with the inner sidewall 111, the remaining part of the magnetic core 21 will not undergo warping or other deformation or displacement. This ensures that the position of the power-taking component 20 within the receiving cavity 113 does not change, and that the direction of the magnetic field through the magnetic core 21 and the coil 22 does not change, thereby improving the power-taking performance of the power-taking component 20.

[0045] In this embodiment, a slot is provided within the receiving cavity 113, with the slot circumferentially positioned at both ends of the receiving cavity 113. A protrusion 31 is provided on the limiting member 30, and the protrusion 31 engages with the slot to fix the limiting member 30 onto the housing 11. Through this arrangement, the slot and protrusion 31 cooperate to maximize the contact area between the two ends of the magnetic core 21 and the inner sidewall 111 along the circumference of the receiving cavity 113, thereby increasing the contact area between the magnetic core 21 and the outer surface of the cable and enhancing the power extraction capability of the inductive power extraction device. Simultaneously, the circumferential positioning of the slot at both ends of the receiving cavity 113, along with the protrusion 31, increases the contact area between the limiting member 30 and the magnetic core 21, enhancing the limiting effect of the limiting member 30.

[0046] Specifically, the housing 11 has an open end and a closed end arranged opposite to each other along the axial direction. A mounting base 14 is provided within the receiving cavity 113. The mounting base 14 is disposed on the surface of the closed end and has a slot. The mounting base 14 also has a stop 141, which is disposed on the side of the slot near the circumferential end of the receiving cavity 113 to limit the displacement of the protrusion 31 toward the stop 141. This arrangement prevents the protrusion 31 from excessively shifting toward the circumferential end of the receiving cavity 113 during installation, ensuring sufficient contact area between the limiting member 30 and the magnetic core 21, thereby ensuring the limiting effect of the limiting member 30 and the contact area between the magnetic core 21 and the inner wall 111.

[0047] Specifically, in this application, the outer casing 10 also includes two cover plates 15, which are disposed at the open ends of the two casings 11 to close the receiving cavity 113, so as to ensure the overall structural stability of the inductive power generation device.

[0048] Furthermore, the slot has two spaced-apart protrusions 142, the gap between which accommodates a protrusion 31. The height of the protrusions 142 gradually increases from the direction away from the stop 141. The protrusion 31 on the limiting member 30 abuts against the surface of the closed end, forming a limiting step 33 between the protrusion 31 and the limiting member 30. The stepped surface of the limiting step 33 engages with the end face of the protrusion 142 away from the closed end to limit the displacement of the protrusion 31 away from the stop 141. Through the above arrangement, displacement away from the stop 141 can be prevented when the limiting member 30 is subjected to the elastic force of the magnetic core 21, preventing limiting member 30 from failing to limit, ensuring that the limiting member 30 can stably provide limiting function for the magnetic core 21, allowing the magnetic core 21 to remain in contact with the inner wall 111, and improving the power extraction performance of the inductive power extraction device.

[0049] In some specific embodiments of this application, the side of the limiting member 30 facing the inner sidewall 111 has a contact surface 32, which abuts against the magnetic core 21. The cross-section of the contact surface 32 along the extension direction perpendicular to the limiting member 30 is arc-shaped, and the center of the arc is located away from the inner sidewall 111. This design reduces the possibility of contact between the edge or corner structure on the limiting member 30 and the magnetic core 21, thereby reducing the possibility of charge concentrating on the edge or corner structure of the limiting member 30 under special operating conditions, causing discharge or even breakdown of the magnetic core 21, and thus ensuring the operational stability of the power extraction component 20.

[0050] In this application, the inductive power extraction device also includes a fixing plate 40, which is disposed within the receiving cavity 113. The fixing plate 40 has multiple fixing blocks 41, each corresponding to a multiple coil 22. The fixing blocks 41 restrict the position of the coil 22 within the receiving cavity 113. Through this arrangement, the multiple fixing blocks 41 can fix the multiple coils 22, maintaining a certain interval between them. This allows the power extraction component 20 to avoid the influence of magnetic field coupling, obtain a higher induced electromotive force, and further improve the power extraction effect of the power extraction component 20.

[0051] In some specific embodiments of this application, the two housings 11 are connected axially at one end by a hinge, and circumferentially at the other end by a snap-fit ​​connector 50. This arrangement facilitates the installation of the inductive power-generating device on cables, including but not limited to installation at cable joints, and also on shielded cables, thus limiting the application scenarios of the inductive power-generating device. Furthermore, compared to conventional bolted connections, the snap-fit ​​connector 50 used in this application prevents excessive pressure on the power cable from causing wear, and also avoids thread stripping and difficulty in disassembly, facilitating the installation and disassembly of the inductive power-generating device. Specifically, the snap-fit ​​connector 50 can be a ring-shaped snap-fit ​​structure or a cantilever snap-fit ​​structure, as long as it facilitates the connection of the two housings 11. Figure 6 and Figure 7 As shown, during the installation of the inductive power supply device, first open the snap-fit ​​50 to allow the two housings 11 of the inductive power supply device to rotate relative to each other, so that the inductive power supply device is in the open state. Then place the cable in the through hole and close the snap-fit ​​50 to allow the inductive power supply device to be in the closed state. In this way, the quick installation of the inductive power supply device can be completed.

[0052] In this application, the total number of turns of the multiple coils 22 located in the two receiving cavities 113 is 30,000-40,000 turns. Specifically, analysis can be performed by testing different numbers of turns of the coils 22 in a low-current mode. During the test, the magnetic core 21 is limited, and the current of the current generator is set to "phase A = 30A, phase B = 30A, phase C = 30A"; and the number of coil turns is set to 5,000, 10,000, 15,000, 20,000, 25,000, 30,000, 35,000, and 40,000 in sequence for testing. The test analysis diagram is shown below. Figure 8As shown in the figure, the horizontal axis represents the number of coil turns, and the vertical axis represents the output voltage. Analysis results show that when the total number of turns of the multiple coils 22 located within the two receiving cavities 113 reaches 30,000, the output voltage at 30A reaches 3.24V, meeting the requirements for operation of sensing devices and other electrical equipment. When the total number of turns reaches 35,000, the output voltage reaches 3.34V. Further increasing to 40,000, the output voltage reaches 3.33V, indicating magnetic saturation. Continuing to increase the total number of turns of the multiple coils 22 will not yield a higher output voltage. By setting the total number of turns of the multiple coils 22 located within the two receiving cavities 113 to 30,000-40,000 turns, the required total number of turns of the coils 22 can be reduced while ensuring the operation requirements of the electrical equipment, thus saving manufacturing costs for the inductive power-generating device. Specifically, the total number of turns of the multiple coils 22 located within the two receiving cavities 113 can be set to 30,000, 32,000, 34,000, 36,000, or 40,000 turns.

[0053] In a preferred embodiment of this application, three coils 22 are provided in each receiving cavity 113, and the number of turns of each coil 22 is set to 6000 turns. Therefore, the total number of coils in the inductive power-generating device is 36000 turns. This reduces the design size of the inductive power-generating device while ensuring its output voltage, facilitating its installation during use. Of course, in other embodiments of this application, the total number of coils 22 can also be set to four or eight, as long as the requirement for the total number of coils is met and the overall size of the inductive power-generating device is not affected.

[0054] Furthermore, the minimum distance between two adjacent coils 22 located within the same receiving cavity 113 is 5-25mm. When the minimum distance between two adjacent coils 22 is less than 5mm, the spacing between the two adjacent coils is too small, which cannot meet the requirements for inductive power extraction when the magnetic field of the three-core cable has been basically canceled out by the outer sheath and the magnetic field exposed around the cable is very limited. When the minimum distance between two adjacent coils 22 is greater than 25mm, it will increase the size of the inductive power extraction device, which is not conducive to the miniaturization of the inductive power extraction device and causes inconvenience in installation. In this application, through the above settings, the power extraction effect of the inductive power extraction device can be optimized while ensuring that the overall size of the inductive power extraction device is small.

[0055] Specifically, the analysis can be performed by testing the coil spacing in low current mode. During the test, the magnetic core 21 is limited, and the current of the current generator is set to "A phase = 30A, B phase = 30A, C phase = 30A". Three coils 22 are set in each cavity 113, and the number of turns of each coil 22 is set to 6000. The spacing between two adjacent coils 22 is tested in sequence at 5mm, 7mm, 10mm, 12mm, 15mm, 17mm, 20mm, and 25mm. The test results are shown in Table 2.

[0056] Table 2: Test results of coil spacing under low current mode

[0057]

[0058] In a preferred embodiment of this application, the minimum distance between two adjacent coils 22 can be set to 12mm to achieve higher power extraction efficiency.

[0059] like Figure 9 As shown, the inductive power harvesting device also includes a control module 60, which comprises an energy harvesting unit, an output unit, and a control unit. The energy harvesting unit has a power harvesting regulation and protection circuit and is electrically connected to the power harvesting component 20. The energy storage unit has an energy storage capacitor and is electrically connected to the energy harvesting unit. The output unit is electrically connected to the energy harvesting unit. The control unit is electrically connected to the energy harvesting unit, the energy storage unit, and the output unit. One of the two housings 10 has a terminal block 70, which is electrically connected to the output unit. Specifically, in this application, the control unit can perform voltage regulation control on the energy harvesting unit to stabilize the voltage acquired by the energy harvesting unit, and the control unit can perform output control on the energy storage unit via PWM control and on the output unit. Specifically, during the operation of the inductive power extraction device, when the energy extraction reaches the minimum starting current of the inductive power extraction device, the control unit prioritizes storing energy in the energy storage unit. When the working voltage is reached, the power is output. When the energy extraction can directly meet the working requirements of the load, the control unit directly controls the power output. The terminal 70 can be connected to an external circuit to output the power obtained by the inductive power extraction device to supply the electrical equipment.

[0060] Specifically, in this application, a wiring hole 80 is provided at one end of the two housings 11 that are hinged to each other, so as to connect the two power-collecting components 20 and the control module 60, while also preventing interference with the installation of the inductive power-collecting device on the cable.

[0061] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0062] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0063] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0064] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0065] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0066] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An inductive power extraction device, characterized in that, The inductive power generation device includes: The outer casing (10) is an annular structure. The inner ring of the outer casing (10) is a through hole (100) for passing through a cable. The outer casing (10) includes two opposing housings (11) that are detachably connected. Each housing (11) has an opposing inner sidewall (111) and an outer sidewall (112). A receiving cavity (113) is formed between the inner sidewall (111) and the outer sidewall (112). The inner sidewalls (111) of the two housings (11) cooperate with each other to form the through hole (100). The two inner sidewalls (111) abut against the surface of the cable. Power-gathering components (20) are respectively disposed in the two receiving cavities (113). The power-gathering components (20) include a magnetic core (21) and a plurality of coils (22). The magnetic core (21) extends circumferentially along the through hole (100), and the plurality of coils (22) are passed through the magnetic core (21). Two adjacent coils (22) are spaced apart. Two limiting members (30) are provided in each of the receiving cavities (113). The two limiting members (30) are respectively located at the two ends of the receiving cavity (113) along the circumferential direction. There is a gap between the limiting member (30) and the inner sidewall (111). The two ends of the magnetic core (21) are correspondingly provided with the two limiting members (30). The end of the magnetic core (21) is located in the gap. The limiting member (30) is used to make the end of the magnetic core (21) abut against the inner sidewall (111). The limiting member (30) is detachably mounted on the housing (11); The limiting member (30) has a contact surface (32) on the side facing the inner wall (111), the contact surface (32) abuts against the magnetic core (21), and the contact surface (32) has an arc-shaped cross section along the extension direction perpendicular to the limiting member (30), with the center of the arc located away from the inner wall (111). The total number of turns of the plurality of coils (22) located in the two receiving cavities (113) is 30,000-40,000; The minimum distance between two adjacent coils (22) located in the same receiving cavity (113) is 5-25 mm.

2. The inductive power extraction device according to claim 1, characterized in that, The cavity (113) is provided with a slot, which is arranged circumferentially at both ends of the cavity (113). The limiting member (30) is provided with a protrusion (31), which is inserted into the slot to fix the limiting member (30) on the housing (11).

3. The inductive power extraction device according to claim 2, characterized in that, The housing (11) has an open end and a closed end arranged opposite to each other along the axial direction. The receiving cavity (113) has a mounting seat (14). The mounting seat (14) is disposed on the surface of the closed end. The mounting seat (14) has the slot. The mounting seat (14) also has a stop (141). The stop (141) is disposed on one side of the slot near the circumferential end of the receiving cavity (113) to limit the displacement of the protrusion (31) toward the stop (141).

4. The inductive power extraction device according to claim 3, characterized in that, The slot has two spaced protrusions (142), the gap between the two protrusions (142) is used to accommodate the protrusion (31), the height of the protrusion (142) gradually increases from the direction away from the stop (141), the protrusion (31) on the limiting member (30) abuts against the surface of the closed end, a limiting step (33) is formed between the protrusion (31) and the limiting member (30), the stepped surface of the limiting step (33) is limited to the end face of the protrusion (142) away from the closed end, so as to limit the displacement of the protrusion (31) away from the stop (141).

5. The inductive power extraction device according to claim 1, characterized in that, The inductive power-generating device also includes a fixing plate (40), which is disposed in the receiving cavity (113). The fixing plate (40) is provided with a plurality of fixing blocks (41), which are disposed corresponding to a plurality of coils (22). The fixing blocks (41) are used to limit the position of the coils (22) in the receiving cavity (113).

6. The inductive power extraction device according to claim 1, characterized in that, The two housings (11) are connected by a hinge at one end in the axial direction and by a snap-fit ​​connection (50) at the other end in the circumferential direction.

7. The inductive power extraction device according to claim 1, characterized in that, The inductive power collection device further includes a control module (60), which includes: The power harvesting unit has a power harvesting regulation and protection circuit, and the power harvesting unit is electrically connected to the power harvesting component (20); An energy storage unit has an energy storage capacitor, and the energy storage unit is electrically connected to the energy harvesting unit; The output unit is electrically connected to the energy harvesting unit; The control unit is electrically connected to the energy harvesting unit, the energy storage unit, and the output unit, respectively. One of the two housings (11) is provided with a terminal block (70), which is electrically connected to the output unit.

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