Cable energy taking structure

Abstract

The embodiment of the invention provides a cable energy taking structure, and relates to the technical field of cable energy taking. According to the cable energy taking structure, the energy taking structure is directly installed outside the cable and does not need to be disassembled, energy taking of the cable can be achieved under the condition that alternating current and direct current are conducted in the cable, energy taking equipment of the cable does not need to be replaced, the cable energy taking process is simplified, and the cable energy taking difficulty is reduced; the cable energy taking structure comprises a metal shielding layer and an annular conductive structure, the annular conductive structure is used for generating corresponding potential according to current on a cable to be subjected to energy taking under the condition that the current passes through the cable to be subjected to energy taking, and the annular conductive structure is used for being electrically connected with an external load. Therefore, the electric potential on the annular conductive structure is led out to an external carrier.

Description

Technical Field

[0001] The present application relates to the technical field of cable energy extraction, and in particular to a cable energy extraction structure. Background Art

[0002] With the rapid development of the power system, people's demand for electric energy is getting higher and higher. In order to ensure the safety of distribution network cables in use, it is necessary to improve the reliability and flexibility of distribution network cable monitoring devices. Therefore, directly taking energy from the cable is a convenient and flexible way to improve the reliability of cable distribution network cable monitoring devices. At present, the cable energy taking method adopts the principle of electromagnetic induction, winding the coil around the outside of the cable and using the induced electromotive force formed by the magnetic field generated by the current to take energy.

[0003] However, in traditional cable energy extraction devices, the energy extraction device needs to be installed on the outside of the cable and then disassembled after energy extraction. The energy extraction process is very complicated and does not have the universality of AC and DC cables. When the cable conducts different types of currents, the cable energy extraction device needs to be replaced to adapt to different types of currents. Therefore, the complexity and difficulty of cable energy extraction are increased, which in turn affects the reliability and stability of cable detection. Summary of the invention

[0004] Based on this, the cable energy extraction structure provided in the embodiment of the present application directly installs the energy extraction structure on the outside of the cable without disassembly. It can realize energy extraction of the cable when both AC and DC are conducted in the cable. There is no need to replace the energy extraction equipment of the cable, which simplifies the process of cable energy extraction and reduces the difficulty of cable energy extraction.

[0005] A first aspect of an embodiment of the present application provides a cable energy taking structure, including:

[0006] A metal shielding layer, the metal shielding layer surrounds the side of the cable to be powered;

[0007] an annular conductive structure, the annular conductive structure surrounds the circumference of the cable to be drawn, the annular conductive structure is located between the cable to be drawn and the metal shielding layer, and the annular conductive structure is insulated from the cable to be drawn and the metal shielding layer;

[0008] Wherein, when current flows through the cable to be powered, the annular conductive structure is used to generate a corresponding electric potential according to the current on the cable to be powered, and the annular conductive structure is used to be electrically connected to an external load to conduct the electric potential on the annular conductive structure to an external carrier.

[0009] In one embodiment, the annular conductive structure is used to generate a first capacitance with the energy-extracting cable, and the annular conductive structure is used to generate a second capacitance with the metal shielding layer, and the electric potential is determined according to the first capacitance and the second capacitance.

[0010] In one of the embodiments, the metal shielding layer includes a metal cavity, and the cross-sectional shape of the metal cavity in a direction perpendicular to the extension direction of the energy-collecting cable is a closed figure.

[0011] In one embodiment, the cable energy taking structure further includes:

[0012] The first shielding insulating layer is located inside the metal cavity.

[0013] In one embodiment, the metal shielding layer includes a first shielding structure, a second shielding structure and a connecting structure, the extension direction of the first shielding structure and the second shielding structure is parallel to the extension direction of the cable to be energy extracted, the first shielding structure is located on a side of the second shielding structure away from the cable to be energy extracted, and the connecting structure is used to connect the first shielding structure 1 and the second shielding structure;

[0014] Among them, the connecting structure includes a first connecting structure and a second connecting structure, the extension direction of the first connecting structure is the same as the extension direction of the annular conductive structure, and the first spacing is equal to the second spacing, the first spacing is the spacing between the first connecting structure and the cable to be powered, the second spacing is the spacing between the annular conductive structure and the cable to be powered, and the second connecting structure is used to connect the first shielding structure, the second shielding structure and the first connecting structure.

[0015] In one of the embodiments, the distance between the second shielding structure and the annular conductive structure is a first distance, and the first distance is determined according to an edge effect of the annular conductive structure.

[0016] In one of the embodiments, the distance between the first shielding structure and the second shielding structure is a second distance;

[0017] Wherein, the first distance is smaller than the second distance.

[0018] In one embodiment, the distance between the first connecting structure and the annular conductive structure is greater than the insulation spacing of the annular conductive structure.

[0019] In one of the embodiments, when the energy-extracting cable is a DC cable, a semiconductor layer is provided between the annular conductive structure and the metal shielding layer;

[0020] The width of the annular conductive structure in the extension direction of the energy-collecting cable is positively correlated with the output power of the annular conductive structure; and / or,

[0021] The width dimension of the annular conductive structure in the extension direction of the energy-collecting cable is negatively correlated with the conductivity of the semiconductor layer.

[0022] In one of the embodiments, the cable energy extraction structure further includes: a shielding insulation layer located between the metal shielding layer and the annular conductive structure.

[0023] The cable energy-collecting structure provided in the embodiment of the present application includes: a metal shielding layer and an annular conductive structure. The annular conductive structure is surrounded by the circumference of the cable to be collected, and the annular conductive structure is insulated from the cable to be collected and the metal shielding layer. Therefore, the annular conductor structure can form a first capacitor with the cable to be collected, and the annular conductive structure can form a second capacitor with the metal shielding layer. When current passes through the cable to be collected, the combined action of the metal shielding layer and the cable to be collected will change the potential on the annular conductive structure, and convert the electrical energy on the cable to be collected into the electrical potential on the annular conductive structure. The annular conductive structure is then electrically connected to an external load, and the electrical potential on the annular conductive structure is derived to an external carrier. The electrical energy of the cable can be directly derived to the external carrier, thereby realizing direct energy collection from the cable to be collected. In this way, there is no need to install and disassemble the energy collection device, which greatly simplifies the process of cable energy collection and reduces the difficulty of cable energy collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] FIG1 is a schematic structural diagram of a cable energy extraction structure provided in an embodiment of the present application;

[0026] FIG. 2 is a schematic structural diagram of another cable energy extraction structure provided in an embodiment of the present application.

[0027] Description of reference numerals:

[0028] 00. Energy-drawing cable; 01. High-voltage shielding tube; 10. Metal shielding layer; 101. First shielding structure 101; 102. Second shielding structure; 103. Connection structure; 1031. First connection structure; 1032. Second connection structure; 20. Annular conductive structure; 30. First shielding insulating layer; 40. Second shielding insulating layer; 50. Third shielding insulating layer. DETAILED DESCRIPTION

[0029] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0031] It should be understood that when an element or layer is referred to as "on ...", "adjacent to ...", "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to other elements or layers, or there can be intervening elements or layers. On the contrary, when an element is referred to as "directly on ...", "directly adjacent to ...", "directly connected to" or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers, doping types and / or parts, these elements, components, regions, layers, doping types and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer, doping type or part from another element, component, region, layer, doping type or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer, doping type or portion discussed below may be represented as a second element, component, region, layer or portion; for example, the first doping type may be referred to as the second doping type, and similarly, the second doping type may be referred to as the first doping type; the first doping type and the second doping type are different doping types, for example, the first doping type may be P-type and the second doping type may be N-type, or the first doping type may be N-type and the second doping type may be P-type.

[0032] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that, in addition to the orientations shown in the figures, spatially relative terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0033] When used herein, the singular forms "a", "an" and " / the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of the stated features, wholes, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, components, parts or combinations thereof. At the same time, in this specification, the term "and / or" includes any and all combinations of the relevant listed items.

[0034] With the rapid development of the power system, people's demand for electric energy is getting higher and higher. In order to ensure the safety of distribution network cables in use, it is necessary to improve the reliability and flexibility of distribution network cable monitoring devices. Therefore, directly taking energy from the cable is a convenient and flexible way to improve the reliability of cable distribution network cable monitoring devices. At present, the cable energy taking method adopts the principle of electromagnetic induction, winding the coil around the outside of the cable and using the induced electromotive force formed by the magnetic field generated by the current to take energy.

[0035] However, in traditional cable energy extraction devices, the energy extraction device needs to be installed on the outside of the cable and then disassembled after energy extraction. The energy extraction process is very complicated and does not have the universality of AC and DC cables. When the cable conducts different types of currents, the cable energy extraction device needs to be replaced to adapt to different types of currents. Therefore, the complexity and difficulty of cable energy extraction are increased, which in turn affects the reliability and stability of cable detection.

[0036] As shown in Figure 1, an embodiment of the present application provides a cable energy extraction structure, including: a metal shielding layer 10 and an annular conductive structure 20, the metal shielding layer surrounds the circumference of the cable 00 to be energy extracted, the annular conductive structure 20 surrounds the circumference of the cable 00 to be energy extracted, the annular conductive structure 20 is located between the cable 00 to be energy extracted and the metal shielding layer 10, the annular conductive structure 20 is insulated from the cable 00 to be energy extracted and the metal shielding layer 10, wherein, when current passes through the cable 00 to be energy extracted, the annular conductive structure 20 is used to generate a corresponding potential according to the current on the cable 00 to be energy extracted, and the annular conductive structure 20 is used to be electrically connected to an external load to derive the potential on the annular conductive structure 20 to an external carrier.

[0037] Exemplarily, the energy-collecting cable 00 may include a high-voltage shielding tube 01, which circumferentially surrounds the outside of the energy-collecting cable 00 and is located between the energy-collecting cable 00 and the annular energy-collecting structure. The high-voltage shielding tube of the cable can resist electromagnetic interference, thereby ensuring the stability of the cable. It should be noted that the cable energy-collecting structure may also include a third shielding insulation layer 50, which circumferentially surrounds the high-voltage shielding tube 01.

[0038] Exemplarily, the external carrier is a device that receives the power of the cable. Specifically, the external carrier can be any device that can store or use power, such as a battery, a capacitor, a motor, etc. Through the energy extraction structure, the power of the cable can be directly transmitted to the external carrier, providing a stable power supply for the external device.

[0039] The cable energy extraction structure provided in the embodiment of the present application includes: a metal shielding layer 10 and an annular conductive structure 20. The annular conductive structure 20 surrounds the circumference of the cable 00 to be extracted, and the cable 00 to be extracted includes at least the cable 00 to be extracted and the metal shielding layer 10. The annular conductive structure 20 is insulated from the cable 00 to be extracted and the metal shielding layer 10. Therefore, the annular conductor structure can form a first capacitor with the cable 00 to be extracted, and the annular conductive structure 20 can form a second capacitor with the metal shielding layer 10. When current passes through the cable 00 to be extracted, the metal shielding layer 10 and the cable 00 to be extracted will cause the potential on the annular conductive structure 20 to change, and convert the electric energy on the cable 00 to be extracted into the electric potential on the annular conductive structure 20. Then, the annular conductive structure 20 is electrically connected to an external load, and the electric potential on the annular conductive structure 20 is derived to an external carrier. The electric energy of the cable can be directly derived to the external carrier, so as to realize direct energy extraction of the cable 00 to be extracted. This eliminates the need to install or disassemble the energy harvesting device, greatly simplifying the process of cable energy harvesting and reducing the difficulty of cable energy harvesting.

[0040] As shown in FIG1 , in some feasible embodiments, the annular conductive structure 20 is used to generate a first capacitance with the energy-extracting cable 00 , and the annular conductive structure 20 is used to generate a second capacitance with the metal shielding layer 10 , and the potential is determined based on the first capacitance and the second capacitance.

[0041] Exemplarily, the material of the annular conductive structure 20 may include but is not limited to a conductor material, for example, the material of the annular conductive structure 20 may be a metal material. The annular conductive structure 20 is insulated from both the energy-collecting cable 00 and the metal shielding layer 10, and the annular conductive structure 20 and the energy-collecting cable 00 may form a first capacitor, and the annular conductive structure 20 and the energy-collecting cable 00 are respectively two plates of the first capacitor, so that the annular conductive structure 20 surrounds the energy-collecting cable to be measured, and when a current passes through the energy-collecting cable 00, the annular conductive structure 20 generates a corresponding electric potential according to the current on the energy-collecting cable 00, so that the electric energy of the energy-collecting cable 00 can be directly obtained according to the electromotive force generated by the annular conductive structure 20.

[0042] Exemplarily, the metal shielding layer 10 and the annular conductive structure 20 and the energy-collecting cable 00 are all insulated, so the annular conductive structure 20 can form a second capacitor with the metal shielding layer 10, and the annular conductive structure 20 and the metal shielding layer 10 are two plates of the capacitor, wherein the potential of the metal shielding layer 10 is 0, and when no current is generated on the energy-collecting cable 00, the potential of the annular conductive structure 20 is equal to the potential of the metal shielding layer 10, and when current is generated on the energy-collecting cable 00, the annular conductive structure 20 can generate a corresponding potential according to the current on the energy-collecting cable 00, so that the electric energy of the energy-collecting cable 00 can be directly obtained according to the potential generated by the annular conductive structure 20, and the metal shielding layer 10 can establish an electrostatic field barrier between the energy-collecting cable 00 and the external environment to prevent the danger of insulation breakdown due to the increase in the electrostatic field strength, and can effectively suppress the interference of external electromagnetic waves to ensure the normal operation of the cable and improve the reliability and safety of the cable energy-collecting structure. More specifically, the first capacitance value can be calculated according to the following formula:

[0043]

[0044] In the formula, C1 is the first capacitance value, b is the radius of the annular conductive structure 20; c is the radius of the metal shielding layer 10, d is the size of the annular conductive structure 20 along the extension direction of the energy-extracting cable 00, and ε2 is the dielectric constant of the first shielding insulating layer 30.

[0045] The second capacitance value can be calculated according to the following formula:

[0046]

[0047] Wherein, C2 is the second capacitance value, b is the radius of the annular conductive structure 20, a is the radius of the energy-collecting cable 00, d is the dimension of the annular conductive structure 20 along the extending direction of the energy-collecting cable 00, and ε1 is the dielectric constant of the second shielding insulating layer 40.

[0048] The potential of the annular conductive structure 20 can be calculated according to the following formula:

[0049]

[0050] In the formula, U is the potential of the annular conductive structure 20, and U0 is the potential of the cable 00 to be energy extracted. d is the dimension of the annular conductive structure 20 along the extension direction of the cable 00 to be energy extracted. d has no effect on the potential. The dielectric constant ε2 of the first shielding insulation layer 30 and the dielectric constant ε1 of the second shielding insulation layer 40 and the radius c of the metal shielding layer 10 are key parameters that determine the cable energy extraction structure. In the case of actual cable transmission of electrical energy, the potential of the cable 00 to be energy extracted is relatively high, and a wider radius of the metal shielding layer 10 can be set for ease of processing. The dimension d of the annular conductive structure 20 along the extension direction of the cable 00 to be energy extracted can affect the output power of the cable energy extraction structure. Therefore, the width of the annular conductive structure 20 can be set according to actual needs.

[0051] Exemplarily, when no current is generated on the cable 00 to be powered, the electric potential of the annular conductive structure 20 is equal to the electric potential of the metal shielding layer 10. In this case, the annular conductive structure 20 will not have any effect on the electric energy of the cable. When current is generated on the cable 00 to be powered, the annular conductive structure 20 can generate a corresponding electric potential according to the current on the cable 00 to be powered, because there is an electric field between the annular conductive structure 20 and the cable 00 to be powered, and the current will generate a magnetic field in the electric field. According to Faraday's law of electromagnetic induction, changes in the magnetic field will generate an electromotive force, thereby generating a potential difference in the annular conductive structure 20. In this way, the electric energy of the cable 00 to be powered can be directly obtained according to the electric potential generated by the annular conductive structure 20.

[0052] It should be noted that electric potential refers to the ratio of the potential energy of a point in an electric field to the charge of a unit positive charge. In the annular conductive structure 20, according to the symmetry of the ring, the electric potential at any point on the plane of the ring is equal to the electric potential of each point on the circumference with the center of the ring as the center and the distance from the point to the center of the ring as the radius, so that the electric energy in the cable 00 to be harvested can be uniformly and stably harvested into the annular conductive structure 20, thereby improving the stability of the cable energy harvesting.

[0053] The cable energy-collecting structure provided in the embodiment of the present application generates a first capacitance through the annular conductive structure 20 and the cable 00 to be collected, and generates a second capacitance through the annular conductive structure 20 and the metal shielding layer 10. When no current is generated on the cable 00 to be collected, the potential of the annular conductive structure 20 is equal to the potential of the metal shielding layer 10. When current is generated on the cable 00 to be collected, the annular conductive structure 20 can generate a corresponding potential according to the current on the cable 00 to be collected, so that the electric energy of the cable 00 to be collected can be directly obtained according to the potential generated by the annular conductive structure 20. There is no need to directly contact the cable 00 to be collected, so it will not cause any damage or interference to the cable. It can work normally when there is current flowing on the cable 00 to be collected, and automatically stop collecting energy when there is no current on the cable 00 to be collected. No manual control is required, and no disassembly and assembly are required, so high conversion efficiency and high automation can be achieved.

[0054] As shown in FIG. 1 , in some feasible implementations, the metal shielding layer 10 includes a metal cavity (not shown), and the cross-sectional shape of the metal cavity in a direction perpendicular to the extension direction of the energy-collecting cable 00 is a closed figure.

[0055] Exemplarily, the metal shielding layer 10 can prevent electromagnetic interference. The metal shielding layer 10 can reduce the propagation of electromagnetic waves by reflection and absorption. When the electromagnetic wave encounters the metal shielding layer 10, part of the energy will be reflected back and the other part of the energy will be absorbed. In this way, the energy of the electromagnetic wave will be greatly weakened, thereby reducing interference with the device. The cross-sectional shape of the metal shielding layer 10 is a closed figure, which can increase the distance between the metal shielding layer 10 and the annular conductive structure 20, so as to provide space for the metal shielding layer 10 and the annular conductive structure 20 to generate a second capacitor. And the closed figure can effectively prevent the penetration and interference of electromagnetic waves, thereby preventing the propagation of electromagnetic waves. And the closed figure can also increase the surface area of ​​the metal shielding layer 10, thereby improving its ability to reflect and absorb electromagnetic waves. More specifically, the closed figure can include any figure with a number of sides greater than 3. For example, the cross-sectional shape of the metal cavity in the direction perpendicular to the extension direction of the energy-collecting cable 00 is a closed figure that can be a rectangle, a triangle or a pentagon.

[0056] The cable energy extraction structure provided in the embodiment of the present application is a closed figure in the cross-sectional shape of the metal cavity perpendicular to the extension direction of the energy extraction cable 00 by setting a metal cavity in the metal shielding layer 10. Space can be provided for the metal shielding layer 10 and the annular conductive structure 20 to generate a second capacitor. The closed figure can effectively prevent the penetration and interference of electromagnetic waves, thereby preventing the propagation of electromagnetic waves. The closed figure can also increase the surface area of ​​the metal shielding layer 10, thereby improving its ability to reflect and absorb electromagnetic waves.

[0057] As shown in FIG. 1 , in some feasible implementations, the cable energy extraction structure further includes: a first shielding insulation layer 30 located inside the metal cavity.

[0058] Exemplarily, the first insulating layer is located inside the metal cavity, and can insulate the annular conductive structure 20 from the metal shielding layer 10, so that the annular conductive structure 20 and the energy-collecting cable 00 generate a second capacitor. In addition, the first insulating layer electrically isolates the energy-collecting cable 00 from the earth and the wire cores of different phases from each other, preventing interference from external electromagnetic waves, thereby ensuring the normal operation of the cable and the safe transmission of electric energy.

[0059] The cable energy-collecting structure provided in the embodiment of the present application can achieve insulation between the annular conductive structure 20 and the metal shielding layer 10 by setting a first insulating layer inside the metal cavity, so that the annular conductive structure 20 and the cable to be collected 00 generate a second capacitor. In addition, the first insulating layer electrically isolates the cable to be collected 00 from the earth and the wire cores of different phases from each other, preventing interference from external electromagnetic waves, thereby ensuring the normal operation of the cable and the safe transmission of electric energy.

[0060] As shown in Figure 2, in some feasible embodiments, the metal shielding layer 10 includes a first shielding structure 101, a second shielding structure 102 and a connecting structure 103, the extension direction of the first shielding structure 101 and the second shielding structure 102 is parallel to the extension direction of the cable 00 to be energy extracted, the first shielding structure 101 is located on the side of the second shielding structure 102 away from the cable 00 to be energy extracted, and the connecting structure 103 is used to connect the first shielding structure 101 and the second shielding structure 102; wherein, the connecting structure 103 includes a first connecting structure 1031 and a second connecting structure 1032, the extension direction of the first connecting structure 1031 is the same as the extension direction of the annular conductive structure 20, and the first spacing is equal to the second spacing, the first spacing is the spacing between the first connecting structure 1031 and the cable 00 to be energy extracted, the second spacing is the spacing between the annular conductive structure 20 and the cable 00 to be energy extracted, and the second connecting structure 1032 is used to connect the first shielding structure 101, the second shielding structure 102 and the first connecting structure 1031.

[0061] Exemplarily, the extension direction of the first shielding structure 101 and the second shielding structure 102 is parallel to the extension direction of the power cable 00 to be extracted, wherein the first shielding structure 101 is located on the side of the second shielding structure 102 away from the power cable 00 to be extracted, and the connecting structure 103 is used to connect the first shielding structure 101 and the second shielding structure 102, so as to provide space for the insulating structure between the annular conductive structure 20 and the metal shielding layer 10, so that the annular conductive structure 20 and the metal shielding layer 10 generate a second capacitor, and the first shielding layer and the second shielding layer circumferentially surround the power cable 00 to be extracted, which can help reduce the electromagnetic interference of the power cable 00 to be extracted during the transmission of electric energy and improve the signal transmission quality of the power cable 00 to be extracted. The connecting structure 103 further includes a first connecting structure 1031 and a second connecting structure 1032. The second connecting structure 1032 connects the first shielding structure 101, the second shielding structure 102 and the first connecting structure 1031 to ensure that they can maintain a stable positional relationship throughout the entire cable length. To ensure that the first shielding structure 101 and the second shielding structure 102 can achieve a stable shielding effect during the entire use of the energy extraction cable 00.

[0062] The cable energy-collecting structure provided in the embodiment of the present application can provide space for the insulating structure between the annular conductive structure 20 and the metal shielding layer 10 through the first shielding structure 101, the second shielding structure 102, the first connecting structure 1031 and the second connecting structure 1032, so that the annular conductive structure 20 and the metal shielding layer 10 generate a second capacitor, and the first shielding layer and the second shielding layer circumferentially surround the cable 00 to be collected, which can help reduce the electromagnetic interference of the cable 00 to be collected during the transmission of electric energy and improve the signal transmission quality of the cable 00 to be collected. The second connecting structure 1032 connects the first shielding structure 101, the second shielding structure 102 and the first connecting structure 1031 to ensure that they can maintain a stable positional relationship throughout the length of the cable. This ensures that the first shielding structure 101 and the second shielding structure 102 can achieve a stable shielding effect during the use of the cable 00 to be collected.

[0063] As shown in FIG. 2 , in some feasible implementations, the distance between the second shielding structure 102 and the annular conductive structure 20 is a first distance, and the first distance is determined according to the edge effect of the annular conductive structure 20 .

[0064] It should be noted that the edge effect refers to the fact that when the distance between the two plates of a capacitor is small, the capacitance value of the capacitor will deviate due to the existence of the edge effect.

[0065] Exemplarily, the distance between the second shielding structure 102 and the annular conductive structure 20 is the first distance. The first distance can be set according to the actual application of the cable energy extraction structure to avoid the problem of uneven electric field distribution at the junction of the two plates caused by the edge effect, resulting in different potentials between the metal shielding layer 10 and the annular conductive structure 20.

[0066] The cable energy collection structure provided in the embodiment of the present application can avoid the problem of uneven electric field distribution at the junction of the two poles caused by the edge effect, resulting in different electric potentials between the metal shielding layer 10 and the annular conductive structure 20, by changing the size of the first distance, thereby improving the reliability of cable energy collection.

[0067] As shown in FIG. 2 , in some feasible implementations, the distance between the first shielding structure 101 and the second shielding structure 102 is a second distance; wherein the first distance is smaller than the second distance.

[0068] Exemplarily, the distance between the first shielding structure 101 and the second shielding structure 102 is the second distance, which can ensure that the first shielding structure 101 effectively shields electromagnetic interference, helps to reduce electromagnetic interference in the process of transmitting electric energy of the energy-collecting cable 00, and improves the signal transmission quality of the energy-collecting cable 00. And by setting the first distance to be less than the second distance, the insulation between the annular conductive structure 20 and the first shielding structure 101 can be ensured.

[0069] The cable energy extraction structure provided in the embodiment of the present application changes the distance between the first shielding structure 101 and the second shielding structure 102 to meet the insulation requirements between the annular conductive structure 20 and the first shielding structure 101, avoid the risk of current leakage during the cable energy extraction process, and improve the reliability and safety of the cable energy extraction. And by setting the first distance to be smaller than the second distance, the insulation between the annular conductive structure 20 and the first shielding structure 101 can be ensured.

[0070] As shown in FIG. 2 , in some feasible implementations, the distance between the first connection structure 1031 and the annular conductive structure 20 is greater than the insulation spacing of the annular conductive structure 20 .

[0071] Exemplarily, the distance between the first connection structure 1031 and the annular conductive structure 20 can be designed according to the insulation requirements between the annular conductive structure 20 and the second shielding structure 102 to avoid the risk of current leakage during the cable power extraction process, thereby affecting the normal operation of the device. The first distance is smaller than the second distance to ensure insulation between the annular conductive structure 20 and the first shielding structure 101.

[0072] The cable energy-collecting structure provided in the embodiment of the present application changes the distance between the first connecting structure 1031 and the annular conductive structure 20 to meet the insulation requirements between the annular conductive structure 20 and the second shielding structure 102, thereby avoiding the risk of current leakage during the cable energy-collecting process and improving the reliability and safety of the cable energy-collecting.

[0073] As shown in Figure 2, in some feasible embodiments, when the energy extraction cable 00 is a DC cable, a semiconductor layer is arranged between the annular conductive structure 20 and the metal shielding layer 10; the width dimension of the annular conductive structure 20 in the extension direction of the energy extraction cable 00 is positively correlated with the output power of the annular conductive structure 20; and / or, the width dimension of the annular conductive structure 20 in the extension direction of the energy extraction cable 00 is negatively correlated with the conductivity of the semiconductor layer.

[0074] Exemplarily, by providing a semiconductor layer between the annular conductive structure 20 and the metal shielding layer 10, when the energy cable 00 to be extracted is a DC cable, since the DC cable cannot form a periodically changing current path, a transmission medium capable of providing a changing current is required to provide a potential difference between the annular conductive structure 20 and the metal shielding layer 10. Semiconductor materials will generate electron migration under an applied voltage, so the semiconductor layer can be used to form a changing current path. More specifically, the resistance of the semiconductor layer can be calculated according to the following formula:

[0075]

[0076] In the formula, R is the resistance of the semiconductor layer, b is the radius of the annular conductive structure 20, c is the radius of the metal shielding layer 10, and d is the size of the annular conductive structure 20 along the extending direction of the energy extraction cable 00.

[0077] The output power of the cable energy-taking structure can be calculated according to the following formula:

[0078]

[0079] In the formula, P is the output power of the cable energy extraction structure, U is the potential of the cable 00 to be extracted, b is the radius of the annular conductive structure 20; c is the radius of the metal shielding layer 10, and d is the size of the annular conductive structure 20 along the extension direction of the cable 00 to be extracted.

[0080] The size of the semiconductor layer along the extension direction of the energy extraction cable 00 can be calculated according to the following formula:

[0081]

[0082] In the formula, P is the output power of the cable energy extraction structure, U is the potential of the cable 00 to be extracted, b is the radius of the annular conductive structure 20; c is the radius of the metal shielding layer 10, and d is the size of the annular conductive structure 20 along the extension direction of the cable 00 to be extracted.

[0083] The cable energy extraction structure provided in the embodiment of the present application can form a variable current path through the semiconductor layer, and when the cable 00 to be extracted is a DC cable, the energy extraction effect of the annular conductive structure 20 is guaranteed.

[0084] In some feasible implementations, the cable energy extraction structure further includes: a second shielding insulation layer 40 located between the metal shielding layer 10 and the annular conductive structure 20 .

[0085] Exemplarily, a second shielding insulating layer 40 may be further included between the annular conductive structure 20 and the metal shielding layer 10 to achieve insulation between the annular conductive structure 20 and the metal shielding layer 10, thereby shielding the annular conductive structure 20 from the outside.

[0086] In the cable energy extraction structure provided in the embodiment of the present application, a second shielding insulation layer 40 is arranged in a ring shape between the conductive structure and the metal shielding layer 10 to achieve insulation between the annular conductive structure 20 and the metal shielding layer 10, thereby achieving the effect of shielding the annular conductive structure 20 from the outside world.

[0087] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0088] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features of the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0089] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A cable energy taking structure, characterized in that: include: A metal shielding layer, the metal shielding layer surrounds the side of the cable to be powered; an annular conductive structure, the annular conductive structure surrounds the circumference of the cable to be drawn, the annular conductive structure is located between the cable to be drawn and the metal shielding layer, and the annular conductive structure is insulated from the cable to be drawn and the metal shielding layer; Wherein, when current flows through the cable to be powered, the annular conductive structure is used to generate a corresponding electric potential according to the current on the cable to be powered, and the annular conductive structure is used to be electrically connected to an external load to conduct the electric potential on the annular conductive structure to an external carrier.

2. The cable energy extraction structure according to claim 1, characterized in that: The annular conductive structure is used to generate a first capacitance with the energy-collecting cable, and the annular conductive structure is used to generate a second capacitance with the metal shielding layer, and the electric potential is determined according to the first capacitance and the second capacitance.

3. The cable energy extraction structure according to claim 1, characterized in that: The metal shielding layer comprises a metal cavity, and the cross-sectional shape of the metal cavity in a direction perpendicular to the extension direction of the cable to be energy extracted is a closed figure.

4. The cable energy extraction structure according to claim 3, characterized in that: Also includes: The first shielding insulating layer is located inside the metal cavity.

5. The cable energy extraction structure according to claim 3, characterized in that: The metal shielding layer comprises a first shielding structure, a second shielding structure and a connecting structure, the extension direction of the first shielding structure and the second shielding structure is parallel to the extension direction of the cable to be energy-drawn, the first shielding structure is located on a side of the second shielding structure away from the cable to be energy-drawn, and the connecting structure is used to connect the first shielding structure and the second shielding structure; Among them, the connecting structure includes a first connecting structure and a second connecting structure, the extension direction of the first connecting structure is the same as the extension direction of the annular conductive structure, and the first spacing is equal to the second spacing, the first spacing is the spacing between the first connecting structure and the cable to be powered, the second spacing is the spacing between the annular conductive structure and the cable to be powered, and the second connecting structure is used to connect the first shielding structure, the second shielding structure and the first connecting structure.

6. The cable energy extraction structure according to claim 5, characterized in that: The distance between the second shielding structure and the annular conductive structure is a first distance, and the first distance is determined according to an edge effect of the annular conductive structure.

7. The cable energy extraction structure according to claim 6, characterized in that: The distance between the first shielding structure and the second shielding structure is a second distance; Wherein, the first distance is smaller than the second distance.

8. The cable energy extraction structure according to claim 6, characterized in that: The distance between the first connecting structure and the annular conductive structure is greater than the insulation spacing of the annular conductive structure.

9. The cable energy extraction structure according to claim 1, characterized in that: In the case where the energy-extracting cable is a DC cable, a semiconductor layer is provided between the annular conductive structure and the metal shielding layer; The width dimension of the annular conductive structure in the extension direction of the cable to be harvested is positively correlated with the output power of the annular conductive structure; and / or, The width dimension of the annular conductive structure in the extension direction of the energy-collecting cable is negatively correlated with the conductivity of the semiconductor layer.

10. The cable energy extraction structure according to claim 1, characterized in that: Also includes: The second shielding insulating layer is located between the metal shielding layer and the annular conductive structure.

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