Sensor coil structure, sensor and photovoltaic system

Abstract

The utility model is suitable for the technical field of photovoltaic power generation, and provides a sensor coil structure, a sensor and a photovoltaic system, and the sensor coil structure comprises a first annular circuit board; the magnetic core ring is arranged on the periphery of the first annular circuit board; the second annular circuit board is arranged on the periphery of the magnetic core ring; the sensor coil is wound on the first annular circuit board and the second annular circuit board; and the sensor coil adopts a crossed winding routing mode which is overlapped with the current direction. By means of the arrangement, the wire turns of the sensor coil are wound in a crossed mode, the distributed capacitance between the wire turns of the coil is effectively reduced, the detection bandwidth of the sensor is improved, and it is ensured that fault arc current in a circuit is reliably sensed.

Description

Technical Field

[0001] This application belongs to the field of photovoltaic power generation technology, and in particular relates to a sensor coil structure, a sensor, and a photovoltaic system. Background Technology

[0002] Most photovoltaic power generation systems consist of photovoltaic cell modules connected in series and then in parallel to form a photovoltaic cell matrix. The DC current is then converted to AC current by a string inverter, and the collected current is then combined again through an AC combiner box before finally being boosted and connected to the grid.

[0003] During the above process, cable aging or loosening of conductor contacts can cause fault arcs, which generate high temperatures in a very short time. If not detected and dealt with in time, they may cause fires.

[0004] Because fault arc current is very similar to some normal power frequency currents, it is generally a series of scattered high-frequency, small-amplitude pulses interspersed between adjacent pulses, and also contains a large amount of high-frequency noise. These factors all increase the difficulty of fault arc current acquisition. Existing current sensors mostly use Rogowski coils to monitor line current, but they generally have a narrow detection bandwidth, making it difficult to simultaneously acquire power frequency and high-frequency pulse signals. Moreover, they are susceptible to external electromagnetic and noise interference, and the sensitivity for acquiring small-amplitude pulses is difficult to guarantee. Utility Model Content

[0005] This application provides a sensor coil structure designed to address the problems of narrow detection bandwidth and low acquisition sensitivity in existing current sensors.

[0006] This application provides a sensor coil structure, comprising:

[0007] First ring circuit board;

[0008] A magnetic core ring disposed around the periphery of the first annular circuit board;

[0009] A second annular circuit board is disposed around the periphery of the magnetic core ring; and

[0010] The sensor coils are wound on the first and second ring circuit boards, and the sensor coils are arranged in a cross-winding pattern that overlaps with the current direction.

[0011] Furthermore, the first annular circuit board includes a first annular inner plate and a second annular inner plate. The first annular inner plate, the second annular inner plate, and the second annular circuit board are all provided with holes. The sensor coil includes a first coil with wires wound around the holes on the inner side of the first annular inner plate, the holes on the outer side of the second annular inner plate, and the holes on the outer side of the second annular circuit board, and a second coil with wires wound around the holes on the inner side of the second annular inner plate and the holes on the outer side of the second annular circuit board.

[0012] Furthermore, the first annular inner plate, the second annular inner plate, the second annular circuit board, the magnetic core ring, and the sensor coil are all divided into two symmetrical semi-circular ring structures.

[0013] Secondly, this application also provides a sensor, comprising:

[0014] The outer casing; and

[0015] The sensor coil structure described above is installed inside the housing.

[0016] Furthermore, the outer shell includes two symmetrical semi-circular annular shells, each of which contains a semi-circular sensor coil structure. The cross-section of the semi-circular annular shell is provided with a coil pin and a coil lead hole. The coil pin of one semi-circular annular shell is inserted into the coil lead hole of the other semi-circular annular shell to achieve coupling connection between the two semi-circular sensor coil structures.

[0017] Furthermore, a fixing groove and a fixing block are provided at the cross-section of the semi-circular annular shell. The fixing groove of one semi-circular annular shell is inserted into the fixing block of the other semi-circular annular shell to fix the two semi-circular annular shells together.

[0018] Furthermore, the sensor also includes a signal control module mounted on the housing. The signal control module includes an amplifier circuit, a noise filtering circuit, an integration circuit, and a filter circuit connected in sequence. The input terminal of the amplifier circuit is connected to the sensor coil, and the output terminal of the filter circuit is used to output the induced current signal.

[0019] Furthermore, the amplification circuit includes a first resistor, a second resistor, a third resistor, and a first amplifier; the noise filtering circuit includes a first capacitor and a second capacitor; the integrating circuit includes a fourth resistor, a fifth resistor, a second amplifier, and a third capacitor; and the filtering circuit includes a sixth resistor, a third amplifier, a fourth capacitor, and a fifth capacitor.

[0020] The positive input terminal of the first amplifier is connected to the first end of the first resistor, the inverting input terminal of the first amplifier is connected to the first end of the second resistor, the inverting input terminal of the first amplifier is also connected to the output terminal of the first amplifier through the third resistor, and the output terminal of the first amplifier is connected to the first end of the first capacitor.

[0021] The second end of the first resistor and the second end of the second resistor are connected to the sensor coil.

[0022] The second terminal of the first capacitor is connected to the second terminal of the second resistor;

[0023] The second capacitor is connected in parallel with the first capacitor;

[0024] The inverting input of the second amplifier is connected to the first terminal of the first capacitor. The inverting input of the second amplifier is also connected to the first terminal of the fourth resistor. The non-inverting input of the second amplifier is connected to the second terminal of the second resistor through the fifth resistor. The output of the second amplifier is connected to the second terminal of the fourth resistor.

[0025] The third capacitor is connected in parallel with the fourth resistor;

[0026] The positive input terminal of the third amplifier is connected to the first end of the sixth resistor, the other end of the sixth resistor is connected to the output terminal of the second amplifier, the other end of the sixth resistor is also connected to the output terminal of the third amplifier through the fourth capacitor, the positive input terminal of the third amplifier is also connected to the first end of the fifth capacitor, and the output terminal of the third amplifier and the second end of the fifth capacitor are both used to connect to external circuits to output induced current signals.

[0027] Furthermore, the sensor also includes an explosion-proof connector and a signal output line, with the signal output line connected to the signal control module via the explosion-proof connector.

[0028] Thirdly, this application also provides a photovoltaic system, including the sensor described above.

[0029] The beneficial effects of this application are as follows: The sensor coil structure provided by this application includes a first annular circuit board; a magnetic core ring disposed around the periphery of the first annular circuit board; a second annular circuit board disposed around the periphery of the magnetic core ring; and a sensor coil wound on the first and second annular circuit boards. The sensor coil adopts a cross-winding routing method with overlapping wires in the direction of current. Through the above arrangement, the cross-winding method between the turns of the sensor coil effectively reduces the distributed capacitance between the coil turns, improves the sensor detection bandwidth, and ensures reliable sensing of fault arc current in the circuit. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of one embodiment of the sensor coil structure provided in this application;

[0031] Figure 2 This is a schematic diagram of the coil winding structure of one embodiment of the sensor coil structure provided in this application;

[0032] Figure 3 This is a schematic diagram of an embodiment of the sensor coil structure provided in this application cut into two halves;

[0033] Figure 4 This is a schematic diagram of the structure of one embodiment of the sensor provided in this application;

[0034] Figure 5 This is a schematic diagram of the circuit structure of the signal control module of one embodiment of the sensor provided in this application.

[0035] Explanation of reference numerals in the attached drawings: 100 - First annular circuit board, 110 - First annular inner plate, 120 - Second annular inner plate, 130 - Hole. 200 - Magnetic core ring, 300 - Second ring circuit board, 400 - Sensor coil, 410 - First coil, 420 - Second coil, 500 - Housing, 510 - Coil pin, 520 - Coil lead hole, 530 - Fixing slot, 540 - Fixing block, 600 - Signal control module, 610 - Amplification circuit, 620 - Noise filtering circuit, 630 - Integrating circuit, 640 - Filtering circuit, 700 - Explosion-proof connector, 800 - Signal output line, R1 - First resistor, R2 - Second resistor, R3 - Third resistor, A1 - First amplifier, C1 - First capacitor, C2 - Second capacitor, R4 - Fourth resistor, R5 - Fifth resistor, A2 - Second amplifier, C3 - Third capacitor, R6 - Sixth resistor, A3 - Third amplifier, C4 - Fourth capacitor, C5 - Fifth capacitor. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. Examples of embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining this application and are not intended to limit this application.

[0037] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference values ​​and / or reference letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0042] The sensor coil structure provided in this application includes a first annular circuit board; a magnetic core ring disposed around the periphery of the first annular circuit board; a second annular circuit board disposed around the periphery of the magnetic core ring; and a sensor coil wound on the first and second annular circuit boards. The sensor coil adopts a cross-winding routing method with overlapping wires in the direction of current. Through the above arrangement, the cross-winding method between the turns of the sensor coil effectively reduces the distributed capacitance between the coil turns, improves the sensor detection bandwidth, and ensures reliable sensing of fault arc current in the circuit.

[0043] like Figures 1 to 5 As shown, one embodiment of this application provides a sensor coil structure, including:

[0044] First annular circuit board 100;

[0045] A magnetic core ring 200 is disposed around the first annular circuit board 100;

[0046] A second annular circuit board 300 is disposed around the magnetic core ring 200; and

[0047] The sensor coil 400 is wound on the first annular circuit board 100 and the second annular circuit board 300. The sensor coil 400 adopts a cross-winding routing method that overlaps with the current direction.

[0048] The first annular circuit board 100 and the second annular circuit board 300 can be made of PCB (Printed Circuit Board) or other circuit boards used for winding coils.

[0049] Both the first annular circuit board 100 and the second annular circuit board 300 are formed into annular rings with a certain thickness. For example, the thickness of the first annular circuit board 100 and the second annular circuit board 300 is 3 mm to 4 mm, without limitation.

[0050] The first annular circuit board 100 and the second annular circuit board 300 are arranged concentrically, that is, the first annular circuit board 100 is located in the inner ring of the second annular circuit board 300, and there is a certain space between the first annular circuit board 100 and the second annular circuit board 300. This space is used to set the magnetic core ring 200. In other words, the first annular circuit board 100, the magnetic core ring 200 and the second annular circuit board 300 are arranged sequentially from the inside to the outside.

[0051] The magnetic core ring 200 uses a high permeability magnetic core. For example, the magnetic core ring 200 can be made of silicon steel sheet, iron core or other magnetic core. For example, the permeability of silicon steel sheet is ≥1000H / m and the permeability of iron core is ≥500H / m.

[0052] The sensor coil 400 consists of wires wound on the first annular circuit board 100 and the second annular circuit board 300, and the sensor coil 400 adopts a cross-winding routing method that overlaps with the current direction.

[0053] For example, the first annular circuit board 100 includes a first annular inner plate 110 and a second annular inner plate 120. Both the first annular inner plate 110, the second annular inner plate 120, and the second annular circuit board 300 are provided with holes 130. The sensor coil 400 includes a first coil 410 with wiring wound through the holes 130 on the inner side of the first annular inner plate 110, the outer side of the second annular inner plate 120, and the outer side of the second annular circuit board 300; and a second coil 420 with wiring wound through the holes 130 on the inner side of the second annular inner plate 120 and the outer side of the second annular circuit board 300. Figure 1 and Figure 2 As shown.

[0054] Holes 130 are provided on the first annular inner plate 110, the second annular inner plate 120, and the second annular circuit board 300. The holes 130 are used to fix the coil when winding the coil, that is, to fix the sensor coil 400 during winding.

[0055] The sensor coil 400 structure provided in this application includes a first annular circuit board 100; a magnetic core ring 200 disposed around the first annular circuit board 100; a second annular circuit board 300 disposed around the magnetic core ring 200; and a sensor coil 400 wound on the first annular circuit board 100 and the second annular circuit board 300. The sensor coil 400 adopts a cross-winding routing method with overlapping current direction. Through the above arrangement, the cross-winding method between the turns of the sensor coil 400 effectively reduces the distributed capacitance between the coil turns, improves the sensor detection bandwidth, and ensures reliable sensing of fault arc current in the circuit.

[0056] In some embodiments, the first annular inner plate 110, the second annular inner plate 120, the second annular circuit board 300, the magnetic core ring 200, and the sensor coil 400 are all divided into two symmetrical semi-circular ring structures. By assembling the two semi-circular first annular inner plate 110, the second annular inner plate 120, the second annular circuit board 300, the magnetic core ring 200, and the sensor coil 400 together, a complete annular structure is formed, facilitating installation. When the sensor coil 400 is cross-wound, the windings of the sensor coil 400 located around the second annular circuit board 300 are arranged in an overlapping pattern with the same current direction, such as... Figure 3 As shown.

[0057] In some embodiments, such as Figure 4As shown, this application also provides a sensor, including:

[0058] Casing 500; and

[0059] The sensor coil 400 structure described above is disposed within the housing 500.

[0060] In practice, the outer shell 500 has a hollow structure, which allows the sensor coil 400 structure to be placed inside the outer shell 500, and the outer shell 500 provides waterproof and dustproof protection for the sensor coil 400 structure.

[0061] Optionally, the outer shell 500 can be encapsulated in plastic, such as an ABS plastic outer shell 500 or a PVC (Polyvinylchloride) outer shell 500. For example, taking ABS plastic as an example, ABS plastic is a terpolymer of three monomers: acrylonitrile (A), butadiene (B), and styrene (S), with the molecular formula (C8H8·C4H6·C3H3N)x. The relative contents of the three monomers can be varied arbitrarily to make various resins.

[0062] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the structure and implementation principle of the sensor described above can be referred to the corresponding structure and implementation principle in the foregoing embodiments, and will not be repeated here.

[0063] The sensor coil 400 structure provided in this application includes a first annular circuit board 100; a magnetic core ring 200 disposed around the first annular circuit board 100; a second annular circuit board 300 disposed around the magnetic core ring 200; and a sensor coil 400 wound on the first annular circuit board 100 and the second annular circuit board 300. The sensor coil 400 adopts a cross-winding routing method with overlapping current direction. Through the above arrangement, the cross-winding method between the turns of the sensor coil 400 effectively reduces the distributed capacitance between the coil turns, improves the sensor detection bandwidth, and ensures reliable sensing of fault arc current in the circuit.

[0064] Optionally, the outer shell 500 can be divided into two symmetrical semi-circular shells, and each semi-circular shell is provided with a semi-circular sensor coil 400 structure. That is, the first annular inner plate 110, the second annular inner plate 120, the second annular circuit board 300, the magnetic core ring 200 and the sensor coil 400 are all divided into two symmetrical semi-circular structures, and the semi-circular first annular inner plate 110, the second annular inner plate 120, the second annular circuit board 300, the magnetic core ring 200 and the sensor coil 400 are located inside the semi-circular shell.

[0065] A coil pin 510 and a coil hole 520 are provided at the cross-section of the semi-circular shell. The coil pin 510 of one semi-circular shell is inserted into the coil hole 520 of the other semi-circular shell to realize the coupling connection between the two semi-circular sensor coils 400 structures.

[0066] Optionally, a fixing groove 530 and a fixing block 540 are provided at the cross-section of the semi-circular annular shell. The fixing groove 530 of one semi-circular annular shell is inserted into the fixing block 540 of the other semi-circular annular shell to fix the two semi-circular annular shells together.

[0067] When the two semi-circular annular shells are closed, the fixing slot 530 and the fixing block 540 are aligned and fitted together, while the coil lead 510 and the coil lead hole 520 are aligned and inserted together.

[0068] Furthermore, such as Figure 5 As shown, the sensor provided in this application also includes a signal control module 600 disposed on the housing 500. The signal control module 600 has a signal control circuit, which includes an amplifier circuit 610, a noise filtering circuit 620, an integrator circuit 630 and a filter circuit 640 connected in sequence. The input terminal of the amplifier circuit 610 is connected to the sensor coil, and the output terminal of the filter circuit 640 is used to output the induced current signal.

[0069] Furthermore, the amplifier circuit 610 includes a first resistor R1, a second resistor R2, a third resistor R3 and a first amplifier A1, the noise filtering circuit 620 includes a first capacitor C1 and a second capacitor C2, the integrating circuit 630 includes a fourth resistor R4, a fifth resistor R5, a second amplifier A2 and a third capacitor C3, and the filtering circuit 640 includes a sixth resistor R6, a third amplifier A3, a fourth capacitor C4 and a fifth capacitor C5.

[0070] The positive input terminal of the first amplifier A1 is connected to the first terminal of the first resistor R1, the inverting input terminal of the first amplifier A1 is connected to the first terminal of the second resistor R2, the inverting input terminal of the first amplifier A1 is also connected to the output terminal of the first amplifier A1 through the third resistor R3, and the output terminal of the first amplifier A1 is connected to the first terminal of the first capacitor C1.

[0071] The second end of the first resistor R1 and the second end of the second resistor R2 are connected to the sensor coil 400. That is, the second end of the first resistor R1 and the second end of the second resistor R2 can be regarded as the input terminal Vin of the signal control module 600, which is used to connect the voltage signal of the sensor coil 400.

[0072] The second terminal of the first capacitor C1 is connected to the second terminal of the second resistor R2;

[0073] The second capacitor C2 is connected in parallel with the first capacitor C1;

[0074] The inverting input of the second amplifier A2 is connected to the first terminal of the first capacitor C1. The inverting input terminal of the second amplifier A2 is also connected to the first terminal of the fourth resistor R4. The non-inverting input terminal of the second amplifier A2 is connected to the second terminal of the second resistor R2 through the fifth resistor R5. The output terminal of the second amplifier A2 is connected to the second terminal of the fourth resistor R4.

[0075] The third capacitor C3 is connected in parallel with the fourth resistor R4;

[0076] The positive input terminal of the third amplifier A3 is connected to the first end of the sixth resistor R6, and the other end of the sixth resistor is connected to the output terminal of the second amplifier A2. The other end of the sixth resistor is also connected to the output terminal of the third amplifier A3 through the fourth capacitor C4. The positive input terminal of the third amplifier A3 is also connected to the first end of the fifth capacitor C5. The output terminal of the third amplifier A3 and the second end of the fifth capacitor C5 are both used to connect to external circuits to output induced current signals.

[0077] Optionally, the output terminal of the third amplifier A3 and the second terminal of the fifth capacitor C5 can be regarded as the output terminal Vout of the signal conditioning module 600, which is used to output the induced current signal to the external circuit.

[0078] Optionally, the sensor provided in this application also includes an explosion-proof connector 700 and a signal output line 800, wherein the signal output line 800 is connected to the signal control module 600 through the explosion-proof connector 700.

[0079] In implementation, the amplifier circuit 610 is used to improve the signal-to-noise ratio of the induced voltage of the sensor coil 400, improve the effect of subsequent noise filtering and filtering, and reduce the influence of external electromagnetic interference.

[0080] The noise filtering circuit 620 is used to avoid the situation where the collected signal cannot be accurately identified due to noise interference, thereby improving the accuracy of fault arc identification;

[0081] The integrating circuit 630 is used to make the voltage signal output by the sensor coil 400 linearly related to the measured current, ensuring phase synchronization between voltage and current conversion;

[0082] The filter circuit 640 is used to filter out high-frequency harmonic signals, ensuring the smoothness and restorability of the output signal and enhancing the signal output effect.

[0083] Thirdly, this application also provides a photovoltaic system, including the sensor described above.

[0084] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the structure and implementation principle of the photovoltaic system described above can be referred to the corresponding structure and implementation principle in the foregoing embodiments, and will not be repeated here.

[0085] The sensor coil 400 structure provided in this application includes a first annular circuit board 100; a magnetic core ring 200 disposed around the first annular circuit board 100; a second annular circuit board 300 disposed around the magnetic core ring 200; and a sensor coil 400 wound on the first annular circuit board 100 and the second annular circuit board 300. The sensor coil 400 adopts a cross-winding routing method with overlapping current direction. Through the above arrangement, the cross-winding method between the turns of the sensor coil 400 effectively reduces the distributed capacitance between the coil turns, improves the sensor detection bandwidth, and ensures reliable sensing of fault arc current in the circuit.

[0086] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A sensor coil structure, characterized in that, include: First ring-shaped circuit board; A magnetic core ring disposed around the periphery of the first annular circuit board; A second annular circuit board is disposed around the periphery of the magnetic core ring; as well as The sensor coil is wound on the first and second annular circuit boards, and the sensor coil adopts a cross-winding routing method that overlaps with the current direction.

2. The sensor coil structure as described in claim 1, characterized in that, The first annular circuit board includes a first annular inner plate and a second annular inner plate. The first annular inner plate, the second annular inner plate, and the second annular circuit board are all provided with holes. The sensor coil includes a first coil with wires wound around the holes on the inner side of the first annular inner plate, the holes on the outer side of the second annular inner plate, and the holes on the outer side of the second annular circuit board, and a second coil with wires wound around the holes on the inner side of the second annular inner plate and the holes on the outer side of the second annular circuit board.

3. The sensor coil structure as described in claim 2, characterized in that, The first annular inner plate, the second annular inner plate, the second annular circuit board, the magnetic core ring, and the sensor coil are all divided into two symmetrical semi-circular ring structures.

4. A sensor, characterized in that, include: shell; as well as The sensor coil structure as described in any one of claims 1 to 3 is disposed within the housing.

5. The sensor as described in claim 4, characterized in that, The outer casing includes two symmetrical semi-circular annular shells. Each semi-circular annular shell contains a sensor coil structure in a semi-circular shape. The cross-section of each semi-circular annular shell has a coil pin and a coil lead hole. The coil pin of one semi-circular annular shell is inserted into the coil lead hole of the other semi-circular annular shell to achieve coupling connection between the two semi-circular annular sensor coil structures.

6. The sensor as described in claim 5, characterized in that, The cross-section of the semi-circular annular shell is provided with a fixing groove and a fixing block. The fixing groove of one of the semi-circular annular shells is inserted into the fixing block of the other semi-circular annular shell to fix the two semi-circular annular shells together.

7. The sensor as described in claim 4, characterized in that, The sensor also includes a signal control module disposed on the housing. The signal control module includes an amplification circuit, a noise filtering circuit, an integration circuit, and a filtering circuit connected in sequence. The input terminal of the amplification circuit is connected to the sensor coil, and the output terminal of the filtering circuit is used to output an induced current signal.

8. The sensor as described in claim 7, characterized in that, The amplification circuit includes a first resistor, a second resistor, a third resistor, and a first amplifier; the noise filtering circuit includes a first capacitor and a second capacitor; the integrating circuit includes a fourth resistor, a fifth resistor, a second amplifier, and a third capacitor; and the filtering circuit includes a sixth resistor, a third amplifier, a fourth capacitor, and a fifth capacitor. The positive input terminal of the first amplifier is connected to the first end of the first resistor, the negative input terminal of the first amplifier is connected to the first end of the second resistor, the negative input terminal of the first amplifier is also connected to the output terminal of the first amplifier through the third resistor, and the output terminal of the first amplifier is connected to the first end of the first capacitor. The second end of the first resistor and the second end of the second resistor are connected to the sensor coil; The second terminals of the first capacitor are all connected to the second terminals of the second resistor; The second capacitor and the first capacitor are connected in parallel; The inverting input of the second amplifier is connected to the first terminal of the first capacitor, and the inverting input of the second amplifier is also connected to the first terminal of the fourth resistor. The non-inverting input of the second amplifier is connected to the second terminal of the second resistor through the fifth resistor, and the output of the second amplifier is connected to the second terminal of the fourth resistor. The third capacitor is connected in parallel with the fourth resistor; The positive input terminal of the third amplifier is connected to the first terminal of the sixth resistor, the other terminal of the sixth resistor is connected to the output terminal of the second amplifier, the other terminal of the sixth resistor is also connected to the output terminal of the third amplifier through the fourth capacitor, the positive input terminal of the third amplifier is also connected to the first terminal of the fifth capacitor, and the output terminal of the third amplifier and the second terminal of the fifth capacitor are both used to connect to external circuits to output induced current signals.

9. The sensor as described in claim 7, characterized in that, The sensor also includes an explosion-proof connector and a signal output line, the signal output line being connected to the signal control module via the explosion-proof connector.

10. A photovoltaic system, characterized in that, Includes the sensor as described in any one of claims 1 to 9.

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