Magnetic element structure and ground fault leakage protection system

Abstract

The utility model provides a kind of magnetic component structure, comprising: a magnetic core, include a first hollow hole;A secondary edge winding, winding on the magnetic core;And multiple primary winding, include the first winding and a second winding passing through the first hollow hole of the magnetic core, wherein the first winding and the second winding one end of the first winding on the same side of the magnetic core are staggered arrangement;The magnetic component structure provided by the utility model is staggered arrangement by primary winding on the same side of the magnetic core, and power line (primary winding) is transposed, so that the magnetic flux generated by power line at each place of detection ring (magnetic core) is basically consistent, mutually offset, eliminate the magnetic flux difference generated by the asymmetric distribution of power line, reach the purpose of detecting only leakage current to detection ring, and improve the detection precision of leakage current.

Description

Technical Field

[0001] This utility model relates to the field of power electronics technology, and in particular to a magnetic component structure and a ground fault leakage protection system. Background Technology

[0002] With the widespread development of power electronic power conversion technology in various application fields, the safety and low cost of power supply products have become increasingly important. Ground fault circuit interrupters (GFCIs), as low-cost data acquisition devices in power supply products, can monitor leakage current in circuits, playing a crucial role in ensuring equipment and personal safety.

[0003] Existing ground fault current leakage current protection devices (GFCI) generally include an iron core, an inductor coil (secondary coil), and multiple metal wires (primary coil). When a large leakage current occurs in the equipment, the vector sum of the currents on the metal wires (primary coil) is not zero. At this time, an electrical signal will be induced on the inductor coil of the secondary side, and the electrical signal will be transmitted to the controller and other components to activate the protection mechanism of the power supply equipment.

[0004] Currently, GFCI detection values ​​are easily affected by the external environment. For example, the GFCI values ​​detected under different loads are different, resulting in insufficient detection accuracy. Furthermore, in two-phase or multi-phase applications, it is difficult to compensate through software, which can easily lead to misjudgments. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a magnetic element structure, comprising:

[0006] A magnetic core, including a first hollow hole;

[0007] A side winding is wound on the magnetic core; and

[0008] Multiple primary windings include a first winding and a second winding passing through the first hollow hole of the magnetic core, wherein one end of the first winding and one end of the second winding located on the same side of the magnetic core are staggered.

[0009] In some embodiments, the magnetic element structure further includes a shielding cover, which is disposed on the secondary winding and the magnetic core, and includes a second hollow hole corresponding to the first hollow hole.

[0010] In some embodiments, the shielding cover includes a first shielding cover and a second shielding cover, which are fixed together by adhesive.

[0011] In some embodiments, the magnetic element structure further includes an outer cover located outside the shield and enclosing the shield, and includes a third hollow hole corresponding to the first hollow hole and the second hollow hole.

[0012] In some embodiments, the outer cover includes a first outer cover and a second outer cover, which are fixedly connected by a snap-fit ​​structure.

[0013] In some embodiments, the magnetic element structure further includes a plug-in disposed at the third hollow hole of the outer cover. The plug-in includes at least a first socket and a second socket arranged in sequence. The first winding passes through the first socket and is fixed by the first socket, and the second winding passes through the second socket and is fixed by the second socket.

[0014] In some embodiments, the plurality of primary windings further include a third winding and a fourth winding passing through the first hollow hole of the magnetic core, wherein one end of the third winding and one end of the fourth winding located on the same side of the magnetic core are alternately arranged.

[0015] In some embodiments, the plurality of primary windings further include a third winding, a fourth winding, a fifth winding, and a sixth winding passing through the first hollow hole of the magnetic core, wherein one end of the third winding located on the same side of the magnetic core is alternately arranged with one end of the fourth winding, and one end of the fifth winding located on the same side of the magnetic core is alternately arranged with one end of the sixth winding.

[0016] In some embodiments, the magnetic element structure further includes a plug-in disposed at the third hollow hole of the outer cover. The plug-in includes at least a first socket, a second socket, a third socket, a fourth socket, a fifth socket, and a sixth socket arranged in sequence. The first winding passes through the first socket and is fixed by the first socket. The second winding passes through the second socket and is fixed by the second socket. The third winding passes through the third socket and is fixed by the third socket. The fourth winding passes through the fourth socket and is fixed by the fourth socket. The fifth winding passes through the fifth socket and is fixed by the fifth socket. The sixth winding passes through the sixth socket and is fixed by the sixth socket.

[0017] In some embodiments, the outer cover includes a first pin, a second pin, and a limiting structure for limiting the input and output ends of the secondary winding, wherein the limiting structure includes at least one wire-locking groove and at least one wire-guiding groove, and the input and output ends of the secondary winding are connected to the first pin and the second pin respectively through the at least one wire-locking groove and the at least one wire-guiding groove.

[0018] In some embodiments, the at least one wire-locking slot includes a first wire-locking slot and a second wire-locking slot, the at least one wire-guiding slot includes a first wire-guiding slot and a second wire-guiding slot, the input end of the secondary winding is connected to the first pin and then limited by the first wire-locking slot after passing through the first wire-guiding slot, and is wound on the magnetic core, the output end of the secondary winding is limited by the second wire-locking slot and then connected to the second pin after passing through the second wire-guiding slot.

[0019] In some embodiments, the magnetic core is circular or square in shape, and the first hollow hole is located in the middle of the magnetic core.

[0020] In some embodiments, the secondary winding is wound around the magnetic core in either the forward or reverse direction.

[0021] In some embodiments, the plurality of primary windings are copper bars, and / or the secondary windings and the plurality of primary windings are electrically connected to a circuit board.

[0022] This utility model also provides a ground fault leakage protection system, comprising:

[0023] One source of communication;

[0024] As described above, in the magnetic element structure, the first end of the first winding and the first end of the second winding located on the same side of the magnetic core are connected to the two terminals of the AC source, and the second winding is a neutral winding.

[0025] A protection module, wherein the protection module is connected to the second end of the first winding and / or the second end of the second winding located on the same side of the magnetic core; and

[0026] A detection module includes an amplifier and a controller connected to each other. The secondary winding is connected to the amplifier, and the controller controls the operation of the protection module according to the output signal of the amplifier.

[0027] In some embodiments, a circuit board is also included, wherein the secondary winding and the plurality of primary windings are electrically connected to the circuit board, and / or a load is also included, the load being connected via the protection module to a corresponding second end of the first winding and a second end of the second winding located on the same side of the magnetic core.

[0028] In some embodiments, the AC power supply is a two-phase power supply, and the plurality of primary windings further include a third winding and a fourth winding passing through the first hollow hole of the magnetic core, wherein one end of the third winding and one end of the fourth winding located on the same side of the magnetic core are alternately arranged, and the fourth winding is a neutral winding.

[0029] In some embodiments, one end of the second winding located on the same side of the magnetic core is connected to one end of the fourth winding.

[0030] In some embodiments, the AC power supply is a three-phase power supply, and the plurality of primary windings further include a third winding, a fourth winding, a fifth winding, and a sixth winding passing through the first hollow hole of the magnetic core, wherein one end of the third winding and one end of the fourth winding located on the same side of the magnetic core are alternately arranged, and one end of the fifth winding and one end of the sixth winding located on the same side of the magnetic core are alternately arranged, wherein the fourth winding and the sixth winding are neutral windings.

[0031] In some embodiments, any two of the ends of the second winding, the fourth winding, and the sixth winding located on the same side of the magnetic core are connected together. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the magnetic element structure shown in one embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the outer cover structure shown in an embodiment of the present utility model;

[0035] Figure 3 This is a schematic diagram of the magnetic element structure shown in another embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of the ground fault leakage protection system shown in an embodiment of the present invention;

[0037] in:

[0038] 100, 100a - Magnetic element structure;

[0039] 1-Magnetic core;

[0040] 101 - First hollow hole;

[0041] 2-Secondary winding;

[0042] 3-Primary winding;

[0043] 301 - First winding;

[0044] 302 - Second winding;

[0045] 303 - Third winding;

[0046] 304 - Fourth winding;

[0047] 305 - Fifth winding;

[0048] 306 - Sixth winding;

[0049] 3011, 3021, 3031, 3041, 3051, 3061 - First end;

[0050] 3012, 3022, 3032, 3042, 3052, 3062 - Second end;

[0051] 4-Shielding cover;

[0052] 401 - First Shielding Cover;

[0053] 402 - Second shielding cover;

[0054] 403 - Second hollow hole;

[0055] 5-Outer cover;

[0056] 501 - First outer cover;

[0057] 502 - Second outer cover;

[0058] 503 - Third hollow hole;

[0059] 6-Plugin;

[0060] 601 - First socket;

[0061] 602 - Second socket;

[0062] 603 - Third socket;

[0063] 604 - Fourth socket;

[0064] 701 - First pin;

[0065] 702 - Second pin;

[0066] 703 - Third pin;

[0067] 704 - Fourth pin;

[0068] 8-Limiting structure;

[0069] 81-Card slot;

[0070] 811 - First slot for the cable;

[0071] 812 - Second wire slot;

[0072] 813 - Third cable slot;

[0073] 82-Cable channel;

[0074] 821 - First cable management channel;

[0075] 822 - Second cable management channel;

[0076] 823 - Third cable tray;

[0077] 824 - Fourth cable tray;

[0078] 200-Exchange Source;

[0079] 300-Protection Module;

[0080] 310 - First Relay;

[0081] 320 - Second Relay;

[0082] 400 - Detection Module;

[0083] 410-Amplifier;

[0084] 420 - Controller;

[0085] 500-load. Detailed Implementation

[0086] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments to further understand the purpose, solution and effect of this utility model, but it is not intended to limit the scope of protection of the appended claims of this utility model.

[0087] Certain terms are used in this specification and the following claims to refer to specific components or parts. Those skilled in the art will understand that users or manufacturers may use different names or terms to refer to the same component or part. This specification and the following claims do not distinguish components or parts by differences in name, but rather by differences in function. The terms "comprising" and "including" used throughout this specification and the following claims are open-ended and should be interpreted as "including but not limited to". Furthermore, the term "connection" here includes any direct and indirect electrical connection means. Indirect electrical connection means include connections made through other means.

[0088] It should be noted that in the description of this utility model, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", as well as "about", "approximately", "substantially", "left and right", etc., indicating the orientation or positional relationship or parameters, are all based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, a specific size, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0089] One embodiment of this utility model provides a magnetic element structure 100, such as... Figures 1 to 2 As shown, the magnetic element structure 100 includes: a magnetic core 1 containing a first hollow hole 101; a secondary winding 2 wound on the magnetic core 1; and a plurality of primary windings 3, each including a first winding 301 and a second winding 302 passing through the first hollow hole 101 of the magnetic core 1, wherein one end of the first winding 301 and one end of the second winding 302 on the same side of the magnetic core 1 are alternately arranged. Specifically, in some embodiments, the first end 3011 of the first winding 301 and the first end 3021 of the second winding 302 on the first side of the magnetic core 1 are alternately arranged, and the second ends 3012 of the first winding 301 and the second ends 3022 of the second winding 302 on the second side of the magnetic core 1 (e.g., the opposite side of the first side) are also alternately arranged.

[0090] The magnetic component structure 100 described in this embodiment further includes a shielding cover 4, which covers the secondary winding 2 and the magnetic core 1, and includes a second hollow hole 403 corresponding to the first hollow hole 101 of the magnetic core 1. Specifically, in some embodiments, the shielding cover 4 includes a first shielding cover 401 and a second shielding cover 402, which are fixed together, for example, by adhesive. In this embodiment, the shielding cover guides the magnetic flux of a large current to flow along the shielding cover, ensuring that the magnetic core inside the shielding cover is not easily disturbed by external magnetic fields, thus greatly improving stability.

[0091] The magnetic component structure 100 described in this embodiment further includes an outer cover 5. The outer cover 5 is located outside the shielding cover 4 and wraps around the shielding cover 4. The outer cover 5 also includes a third hollow hole 503, which corresponds to the first hollow hole 101 of the magnetic core 1 and the second hollow hole 403 of the shielding cover 4. Specifically, in some embodiments, the outer cover 5 includes a first outer cover 501 and a second outer cover 502, which are fixedly connected by a snap-fit ​​structure.

[0092] The magnetic component structure described in this embodiment also includes a plug-in 6, which is disposed at the third hollow hole 503 of the outer cover 5. The plug-in 6 includes at least a first socket 601 and a second socket 602 arranged in sequence. The first winding 301 passes through the first socket 601 and is fixed by the first socket 601, and the second winding 302 passes through the second socket 602 and is fixed by the second socket 602.

[0093] In some embodiments, such as Figures 1 to 2 As shown, the plurality of primary windings 3 further include a third winding 303 and a fourth winding 304 passing through the first hollow hole 101 of the magnetic core 1, wherein one end of the third winding 303 and one end of the fourth winding 304 located on the same side of the magnetic core 1 are alternately arranged. Specifically, the first end 3011 of the first winding 301 and the first end 3021 of the second winding 302 on the first side of the magnetic core 1 are alternately arranged, the first end 3031 of the third winding 303 and the first end 3041 of the fourth winding 304 are alternately arranged, and the second end 3012 of the first winding 301 and the second end 3022 of the second winding 302 on the second side of the magnetic core 1 (e.g., the opposite side of the first side) are alternately arranged, and the second end 3032 of the third winding 303 and the second end 3042 of the fourth winding 304 are alternately arranged.

[0094] Another embodiment of this utility model provides a magnetic element structure, see reference. Figure 3 In this embodiment, the magnetic element structure 100a and Figures 1 to 2The magnetic element structures 100 shown are similar, and the same component labels represent the same components, structures, and functions, which will not be described again here. In this embodiment, the plurality of primary windings 3 further include a third winding 303, a fourth winding 304, a fifth winding 305, and a sixth winding 306 passing through the first hollow hole 101 of the magnetic core 1, wherein one end of the third winding 303 located on the same side of the magnetic core is alternately arranged with one end of the fourth winding 304, and one end of the fifth winding 305 located on the same side of the magnetic core is alternately arranged with one end of the sixth winding 306. Specifically, the magnetic element structure 100a is arranged such that the first end of the first winding 301 and the first end of the second winding 302 are alternately arranged on the first side of the magnetic core 1, the first end of the third winding 303 and the first end of the fourth winding 304 are alternately arranged, and the first end of the fifth winding 305 and the first end of the sixth winding 306 are alternately arranged on the second side of the magnetic core 1 (e.g., the opposite side of the first side), the second end of the first winding 301 and the second end of the second winding 302 are alternately arranged, the second end of the third winding 303 and the second end of the fourth winding 304 are alternately arranged, and the second end of the fifth winding 305 and the second end of the sixth winding 306 are alternately arranged on the second side of the magnetic core 1.

[0095] Accordingly, the magnetic element structure 100a in this embodiment further includes a plug-in 6, which is disposed at the third hollow hole 503. The plug-in 6 includes at least a first socket 601, a second socket 602, a third socket 603, a fourth socket 604, a fifth socket, and a sixth socket (not shown in the figure) arranged in sequence. The first winding 301 passes through the first socket 601 and is fixed by the first socket 601. The second winding 302 passes through the second socket 602 and is fixed by the second socket 602. The third winding 303 passes through the third socket 603 and is fixed by the third socket 603. The fourth winding 304 passes through the fourth socket 604 and is fixed by the fourth socket 604. The fifth winding passes through the fifth socket and is fixed by the fifth socket. The sixth winding passes through the sixth socket and is fixed by the sixth socket (not shown in the figure).

[0096] The magnetic element structure described in the above embodiments of this utility model is as follows: Figure 2 The outer cover 5 also includes a first pin 701, a second pin 702, and a limiting structure 8 for limiting the input and output ends of the secondary winding 2. The limiting structure 8 includes at least one wire-locking groove 81 and at least one wire-guiding groove 82. The input and output ends of the secondary winding 2 are connected to the first pin 701 and the second pin 702 respectively through the at least one wire-locking groove 81 and the at least one wire-guiding groove 82.

[0097] The at least one wire-locking groove 81 includes a first wire-locking groove 811 and a second wire-locking groove 812, and the at least one wire-guiding groove 82 includes a first wire-guiding groove 821 and a second wire-guiding groove 822. The input end of the secondary winding 2 is connected to the first pin 701 and is limited by the first wire-locking groove 811 after passing through the first wire-guiding groove 821, and is wound on the magnetic core 1. The output end of the secondary winding 2 is limited by the second wire-locking groove 812 and is connected to the second pin 702 after passing through the second wire-guiding groove 822. It is understood that the outer cover 5 may also include a third pin 703 and a fourth pin 704, wherein the first pin 701 and the third pin 703 are arranged opposite to each other, and the third pin 703 and the fourth pin 704 are arranged opposite to each other; the at least one wire management groove 82 may also include a third wire management groove 823 and a fourth wire management groove 824; the at least one wire holding groove 81 may also include a third wire holding groove 813, and the first wire holding groove 811, the second wire holding groove 812 and the third wire holding groove 813 are arranged side by side; wherein the input end and output end of the secondary winding 2 can be freely selected according to the actual needs of the product to use which lead pin, wire management groove and wire holding groove, as long as it can connect, lead, limit and other functions of the input end and output end of the secondary winding 2. This case does not impose specific restrictions on the path of the input / output end.

[0098] In this embodiment of the invention, the magnetic core 1 is, for example, circular or square, but can also be other shapes, such as pentagonal or elliptical, and is not limited thereto. Correspondingly, the first hollow hole 101 is located in the middle of the magnetic core 1. The secondary winding 2 is wound around the magnetic core 1 in either the forward or reverse direction. The plurality of primary windings are, for example, copper strips, which can carry large currents. In some embodiments, the secondary winding 2 and the plurality of primary windings are, for example, electrically connected to a circuit board. Specifically, the secondary winding 2 is electrically connected to the circuit board via a first pin 701, a second pin 702, a third pin 703, and / or a fourth pin 704.

[0099] Another embodiment of this utility model provides a ground fault leakage protection system, see reference. Figure 4The device includes: an AC power source 200; a magnetic element structure 100 as described in the previous embodiment, wherein the first end 3011 of the first winding 301 and the first end 3021 of the second winding 302, located on the same side of the magnetic core, are correspondingly connected to the two terminals of the AC power source 200, and the second winding 302 is a neutral winding; a protection module 300, the protection module 300 being connected to the second end 3012 of the first winding 301 and / or the second end 3022 of the second winding 302, located on the same side of the magnetic core; and a detection module 400, including an amplifier 410 and a controller 420 connected to each other, the secondary winding being connected to the amplifier 410, and the controller 420 controlling the operation of the protection module 300 according to the output signal of the amplifier 410. In this embodiment, the magnetic element structure 100 can be used as a ground fault current leakage protector, which is used when a large leakage current occurs in the power supply equipment (such as...). Figure 4 As shown in the peripheral current path), the vector sum of the currents on the primary winding is not zero, and the secondary winding will induce an electrical signal. The electrical signal is amplified by amplifier 410 and then transmitted to controller 420. Controller 420 sends a control command to protection module 300 to activate the protection mechanism of the power supply equipment, protect humans from severe or fatal electric shock, and protect the equipment from fire.

[0100] In some embodiments, the protection module 300 includes a first relay 310 and / or a second relay 320, wherein the first relay 310 is electrically connected, for example, between the second end 3012 of the first winding 301 and the load 500, and the second relay 320 is electrically connected, for example, between the neutral winding and the load 500. It is understood that the protection module 300 in this invention can also be composed of other electronic devices, such as controllable switching transistors, as long as they can disconnect the magnetic component structure from the load 500 after receiving a control command from the controller 420.

[0101] The ground fault leakage protection system further includes a circuit board, wherein the secondary winding and the plurality of primary windings are electrically connected to the circuit board.

[0102] As in the above embodiment, the ground fault leakage protection system further includes a load 500, which is connected via the protection module 300 to the second end 3012 of the first winding 301 and the second end 3022 of the second winding 302, which are located on the same side of the magnetic core.

[0103] It is worth noting that when the AC power supply 200 is a single-phase AC power supply, the plurality of primary windings include a first winding 301 and a second winding 302 passing through the first hollow hole 101 of the magnetic core, wherein one end of the first winding 301 located on the same side of the magnetic core and one end of the second winding 302 are alternately arranged, and the second winding 302 is a neutral winding.

[0104] When the AC power supply 200 is a two-phase power supply, the plurality of primary windings include a first winding 301, a second winding 302, a third winding 303, and a fourth winding 304 passing through the first hollow hole 101 of the magnetic core. One end of the first winding 301 located on the same side of the magnetic core is staggered with one end of the second winding 302, and one end of the third winding 303 located on the same side of the magnetic core is staggered with one end of the fourth winding 304. The second winding 302 and the fourth winding 304 are neutral windings, and one end of the second winding 302 located on the same side of the magnetic core is connected to the same end of the fourth winding 304.

[0105] When the AC power supply 200 is a three-phase power supply, the plurality of primary windings include a first winding 301, a second winding 302, a third winding 303, a fourth winding 304, a fifth winding 305, and a sixth winding 306 passing through the first hollow hole 101 of the magnetic core. One end of the first winding 301 located on the same side of the magnetic core is alternately arranged with one end of the second winding 302; one end of the third winding 303 located on the same side of the magnetic core is alternately arranged with one end of the fourth winding 304; and one end of the fifth winding 305 located on the same side of the magnetic core is alternately arranged with one end of the sixth winding 306. The second winding 302, the fourth winding 304, and the sixth winding 306 located on the same side of the magnetic core are neutral windings. Any two of the ends of the second winding 302, the fourth winding 304, and the sixth winding 306 located on the same side of the magnetic core are connected together.

[0106] This invention transposes the power lines (primary windings) by interleaving the primary windings located on the same side of the magnetic core. This ensures that the magnetic flux generated by the power lines at various points on the detection ring (magnetic core) is essentially consistent and cancels each other out, eliminating the flux difference caused by the asymmetrical distribution of the power lines. This achieves the goal of detecting only leakage current in the detection ring, improving the accuracy of leakage current detection. The process is simple and easy to operate. When connected to different loads, the GFCI can also accurately detect leakage current and smoothly activate the protection mechanism of the power supply equipment.

[0107] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A magnetic element structure, characterized in that, include: A magnetic core, including a first hollow hole; A side winding is wound on the magnetic core; as well as Multiple primary windings include a first winding and a second winding passing through the first hollow hole of the magnetic core, wherein one end of the first winding and one end of the second winding located on the same side of the magnetic core are staggered.

2. The magnetic element structure according to claim 1, characterized in that, It also includes a shielding cover, which is disposed on the secondary winding and the magnetic core, and includes a second hollow hole corresponding to the first hollow hole.

3. The magnetic element structure according to claim 2, characterized in that, The shielding cover includes a first shielding cover and a second shielding cover, which are fixed together by adhesive.

4. The magnetic element structure according to claim 2, characterized in that, It also includes an outer cover, which is located outside the shield and wraps around the shield, and includes a third hollow hole corresponding to the first hollow hole and the second hollow hole.

5. The magnetic element structure according to claim 4, characterized in that, The outer cover includes a first outer cover and a second outer cover, which are fixedly connected by a snap-fit ​​structure.

6. The magnetic element structure according to claim 4, characterized in that, It also includes a plug-in, which is disposed at the third hollow hole of the outer cover. The plug-in includes at least a first socket and a second socket arranged in sequence. The first winding passes through the first socket and is fixed by the first socket. The second winding passes through the second socket and is fixed by the second socket.

7. The magnetic element structure according to claim 1, characterized in that, The plurality of primary windings further include a third winding and a fourth winding passing through the first hollow hole of the magnetic core, wherein one end of the third winding and one end of the fourth winding located on the same side of the magnetic core are alternately arranged.

8. The magnetic element structure according to claim 4, characterized in that, The plurality of primary windings further include a third winding, a fourth winding, a fifth winding, and a sixth winding passing through the first hollow hole of the magnetic core, wherein one end of the third winding located on the same side of the magnetic core is alternately arranged with one end of the fourth winding, and one end of the fifth winding located on the same side of the magnetic core is alternately arranged with one end of the sixth winding.

9. The magnetic element structure according to claim 8, characterized in that, It also includes a plug-in, which is disposed at the third hollow hole of the outer cover. The plug-in includes at least a first socket, a second socket, a third socket, a fourth socket, a fifth socket, and a sixth socket arranged in sequence. The first winding passes through the first socket and is fixed through the first socket. The second winding passes through the second socket and is fixed through the second socket. The third winding passes through the third socket and is fixed through the third socket. The fourth winding passes through the fourth socket and is fixed through the fourth socket. The fifth winding passes through the fifth socket and is fixed through the fifth socket. The sixth winding passes through the sixth socket and is fixed through the sixth socket.

10. The magnetic element structure according to claim 4, characterized in that, The outer cover includes a first pin, a second pin, and a limiting structure for limiting the input and output ends of the secondary winding. The limiting structure includes at least one wire-locking groove and at least one wire-guiding groove. The input and output ends of the secondary winding are connected to the first pin and the second pin respectively through the at least one wire-locking groove and the at least one wire-guiding groove.

11. The magnetic element structure according to claim 10, characterized in that, The at least one wire-locking slot includes a first wire-locking slot and a second wire-locking slot. The at least one wire-guiding slot includes a first wire-guiding slot and a second wire-guiding slot. The input end of the secondary winding is connected to the first pin and then limited by the first wire-locking slot after passing through the first wire-guiding slot, and is wound on the magnetic core. The output end of the secondary winding is limited by the second wire-locking slot and then connected to the second pin after passing through the second wire-guiding slot.

12. The magnetic element structure according to claim 1, characterized in that, The magnetic core is circular or square in shape, and the first hollow hole is located in the middle of the magnetic core.

13. The magnetic element structure according to claim 1, characterized in that, The secondary winding is wound around the magnetic core in either the forward or reverse direction.

14. The magnetic element structure according to any one of claims 1-13, characterized in that, The plurality of primary windings are copper bars, and / or the secondary windings and the plurality of primary windings are electrically connected to a circuit board.

15. A ground fault leakage current protection system, characterized in that, Include: One AC power source; The magnetic element structure as described in any one of claims 1-14, wherein the first end of the first winding and the first end of the second winding located on the same side of the magnetic core are connected to the two terminals of the AC power supply respectively, and the second winding is a neutral winding; A protection module, wherein the protection module is connected to the second end of the first winding located on the same side of the magnetic core and / or the second end of the second winding; as well as A detection module includes an amplifier and a controller connected to each other. The secondary winding is connected to the amplifier, and the controller controls the operation of the protection module according to the output signal of the amplifier.

16. The ground fault leakage protection system according to claim 15, characterized in that, It also includes a circuit board, wherein the secondary winding and the plurality of primary windings are electrically connected to the circuit board, and / or, it also includes a load, the load being connected via the protection module to a corresponding second end of the first winding and a second end of the second winding located on the same side of the magnetic core.

17. The ground fault leakage protection system according to claim 15, characterized in that, The AC power supply is a two-phase power supply, and the plurality of primary windings also include a third winding and a fourth winding passing through the first hollow hole of the magnetic core, wherein one end of the third winding and one end of the fourth winding located on the same side of the magnetic core are staggered, and the fourth winding is a neutral winding.

18. The ground fault leakage protection system according to claim 17, characterized in that, One end of the second winding located on the same side of the magnetic core is connected to one end of the fourth winding.

19. The ground fault leakage protection system according to claim 15, characterized in that, The AC power supply is a three-phase power supply. The plurality of primary windings also include a third winding, a fourth winding, a fifth winding, and a sixth winding passing through the first hollow hole of the magnetic core. One end of the third winding and one end of the fourth winding are staggered on the same side of the magnetic core, and one end of the fifth winding and one end of the sixth winding are staggered on the same side of the magnetic core. The fourth winding and the sixth winding are neutral windings.

20. The ground fault leakage protection system according to claim 19, characterized in that, Any two of the ends of the second winding, the fourth winding, and the sixth winding located on the same side of the magnetic core are connected together.

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