Connection structure of transformer and circuit board and residual current detection device

Abstract

A connection structure of a mutual inductor and a circuit board and a residual current detection device, the connection structure comprising: a hollow ring, the hollow ring comprising a first shell and a second shell, the first shell and the second shell combining to form a cavity inside the hollow ring for accommodating the mutual inductor; a mutual inductor wire outlet provided on a side of the hollow ring; an open slot connecting the hollow ring, the open slot being provided with an opening at both ends, and the opening at one end being in communication with the mutual inductor wire outlet; an isolation boss and a metal pin mounting hole provided on the open slot, the isolation boss and the metal pin mounting hole being provided on the same side of the open slot, the isolation boss being used for isolating the connection structure from the circuit board, and the metal pin mounting hole being used for mounting a metal pin, the metal pin being used for electrically connecting mutual inductor wires led out from the mutual inductor wire outlet and the open slot, and electrically connecting the circuit board. The connection structure of the mutual inductor and the circuit board and the residual current detection device are safe and stable, and easy to assemble.

Description

Technical Field

[0001] The present invention generally relates to the field of leakage detection, and more particularly to a connection structure between a mutual inductor and a circuit board and a residual current detection device. Background Art

[0002] RCD (Residual Current Device) is a device used to detect the magnitude of leakage current in a circuit. If an RCD is not installed in the circuit, when a person or animal comes into contact with high voltage, a leakage current will be generated to the ground. When the leakage current exceeds a certain threshold, it will cause the person's or animal's heart to fibrillate, causing cardiac arrest, and thus posing a life-threatening risk. If a leakage detection device such as an RCD is installed in the circuit, when there is leakage current in the circuit and the magnitude of the leakage current signal exceeds the set threshold, the RCD will send an alarm signal to the action mechanism, triggering the action mechanism to quickly disconnect the circuit, thereby achieving the purpose of protecting life safety.

[0003] The main structure of an RCD includes a transformer and a circuit board. Considering that the transformer needs to be resistant to static magnetic interference, a shielding cover is required for the transformer. In current RCDs, the connection structure between the transformer and the circuit board does not surround the protective coil, and the shielding cover is directly adhered to the transformer coil. Before and after the installation of the shielding cover, the coil is exposed to the outside, so the coil is easily damaged and short-circuited, and the structure of the shielding cover adhering to the coil is unstable, so great care must be taken when installing the shielding cover. After the shielding cover is installed, there is no channel for the coil outlet, and the transformer wire outlet is close to the shielding cover. The wire is easily in contact with the shielding cover, which makes production and installation troublesome, and the outlet wire is easily scratched and short-circuited. In addition, the connection structure is only connected to the circuit board through a single row of metal pins (PINs), which is not firm and easy to deform. Summary of the Invention

[0004] The Summary of the Invention introduces a series of simplified concepts that will be further described in the Detailed Description of the Invention. The Summary of the Invention of this application is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0005] An embodiment of the present invention provides a connection structure between a mutual inductor and a circuit board, including:

[0006] A hollow ring, comprising a first shell and a second shell, wherein the first shell and the second shell are combined to form a cavity inside the hollow ring for accommodating a mutual inductor;

[0007] A transformer wire outlet is provided on the side of the hollow ring;

[0008] An open slot connected to the hollow ring, wherein both ends of the open slot are provided with openings, wherein the opening at one end is connected to the transformer wire outlet;

[0009] An isolation boss and a metal pin mounting hole are provided on the open slot, and the isolation boss and the metal pin mounting hole are provided on the same side of the open slot. The isolation boss is used to isolate the connection structure from the circuit board, and the metal pin mounting hole is used to install a metal pin. The metal pin is used to electrically connect the transformer wire led out from the transformer wire outlet and the open slot, and to electrically connect the circuit board.

[0010] In one embodiment, the first shell and the second shell are connected in a sleeve-type manner, the side wall of the first shell is provided with a first opening, the side wall of the second shell is provided with a second opening, and the first opening and the second opening together constitute the transformer wire outlet.

[0011] In one embodiment, the opening slot is connected to the first shell, the height of the opening slot is higher than the first shell, and the second opening is used to limit the opening slot.

[0012] In one embodiment, the isolation boss and the metal pin mounting hole are disposed at ends of the open slot.

[0013] In one embodiment, two isolation bosses and two metal pin mounting holes are respectively provided at the end of each side wall of the open slot, and the metal pin mounting holes are provided inside the isolation bosses.

[0014] In one embodiment, a fool-proof buckle is provided at the bottom of at least one of the isolation bosses.

[0015] In one embodiment, the isolation boss and the metal pin mounting hole are arranged on the back side of the opening slot.

[0016] In one embodiment, the sidewall of the opening slot is provided with an extension portion perpendicular to the extension direction of the opening slot, and the isolation boss and the metal pin mounting hole are provided on the back side of the extension portion;

[0017] An isolation structure is provided at the end of the open slot.

[0018] In one embodiment, a wire channel is provided on a side wall of the opening slot, and the wire channel is perpendicular to the bottom of the opening slot.

[0019] Another embodiment of the present invention provides a residual current detection device, comprising a mutual inductor, a circuit board, a metal pin, a shielding cover, and the connection structure between the mutual inductor and the circuit board as described above, wherein the shielding cover is arranged outside the connection structure;

[0020] The connection structure includes a hollow ring and an open groove connected to the hollow ring, the hollow ring is provided with a transformer wire outlet connected to the open groove, and the open groove is provided with a metal pin mounting hole;

[0021] The mutual inductor is arranged in the hollow ring, the metal pin is installed in the metal pin installation hole and is electrically connected to the circuit board, and the wire of the mutual inductor is led out through the mutual inductor wire outlet and the open slot and is electrically connected to the metal pin.

[0022] The connection structure between the mutual inductor and the circuit board and the residual current detection device in the embodiment of the present invention are safe, stable and easy to assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other purposes, features, and advantages of the present application will become more apparent through a more detailed description of the embodiments of the present application in conjunction with the accompanying drawings. The accompanying drawings are intended to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the drawings, the same reference numerals generally represent the same components or steps.

[0024] Figure 1 Schematic diagram of the installation method of the connection structure between the mutual inductor and the circuit board according to the embodiment of the present invention;

[0025] Figure 2 is a three-dimensional diagram of a connection structure between a mutual inductor and a circuit board according to an embodiment of the present invention;

[0026] Figure 3 This is a front view of a connection structure between a mutual inductor and a circuit board according to an embodiment of the present invention;

[0027] Figure 4 is a side view of a connection structure between a mutual inductor and a circuit board according to an embodiment of the present invention;

[0028] Figure 5 This is a bottom view of a connection structure between a mutual inductor and a circuit board according to an embodiment of the present invention;

[0029] Figure 6 is a three-dimensional diagram of a connection structure between a mutual inductor and a circuit board according to another embodiment of the present invention;

[0030] Figure 7 It is a three-dimensional diagram of a connection structure between a mutual inductor and a circuit board according to another embodiment of the present invention. DETAILED DESCRIPTION

[0031] In the following description, numerous specific details are provided to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without one or more of these details. In other instances, certain technical features well known in the art are not described to avoid confusion with the present invention.

[0032] It should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to make the disclosure thorough and complete and to fully convey the scope of the invention to those skilled in the art. In the drawings, the dimensions and relative sizes of layers and regions may be exaggerated for clarity. Like reference numerals throughout represent like elements.

[0033] It should be understood that when an element or layer is referred to as being "on," "adjacent to," "connected to," or "coupled to" another element or layer, it can be directly on, adjacent to, connected to, or coupled to the other element or layer, or there can be intervening elements or layers. Conversely, when an element is referred to as being "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" another element or layer, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers, and / or parts, these elements, components, regions, layers, and / or parts should not be limited by these terms. These terms are merely used to distinguish one element, component, region, layer, or part from another element, component, region, layer, or part. Thus, a first element, component, region, layer, or part discussed below may be represented as a second element, component, region, layer, or part without departing from the teachings of the present invention.

[0034] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein for convenience of description to describe the relationship of one element or feature shown in the figures to other elements or features. It should be understood that the spatially relative terms are intended to include different orientations of the device in use and operation in addition to the orientations shown in the figures. For example, if the device in the drawings is flipped, then the elements or features described as "under" or "beneath" or "beneath" the other elements will be oriented as "over" the other elements or features. Thus, the exemplary terms "under" and "under" may include both the upper and lower orientations. The device may be oriented otherwise (rotated 90 degrees or in other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0035] The purpose of the terms used herein is only to describe specific embodiments and is not intended to limit the present invention. When used herein, the singular forms "a", "an", and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "comprising" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0036] In order to fully understand the present invention, a detailed structure will be provided in the following description to illustrate the technical solution proposed by the present invention. The preferred embodiments of the present invention are described in detail below. However, in addition to these detailed descriptions, the present invention may also have other implementations.

[0037] In response to the above-mentioned problems existing in the connection structure between the transformer and the circuit board in the current RCD, an embodiment of the present invention provides a connection structure between the transformer and the circuit board and a residual current detection device. The connection structure of the embodiment of the present invention can safely and stably connect the transformer and the circuit board, and is easy to assemble.

[0038] The connection structure between the mutual inductor and the circuit board and the residual current detection device according to the embodiment of the present invention are described in detail below with reference to the accompanying drawings. The features of the following embodiments and implementations may be combined with each other unless they conflict.

[0039] See also Figures 1 to 7 The connection structure 1 of the transformer and the circuit board of the embodiment of the present invention includes: a hollow ring, which includes a first shell 11 and a second shell 12. After the first shell 11 and the second shell 12 are combined, a cavity for accommodating the transformer 2 is formed inside the hollow ring; a transformer wire outlet is arranged on the side of the hollow ring; an open groove 13 connected to the hollow ring, both ends of the open groove 13 are provided with openings, and the opening at one end is connected to the transformer wire outlet; an isolation boss 14 and a metal pin mounting hole 15 are arranged on the open groove 13, and the isolation boss 14 and the metal pin mounting hole 15 are arranged on the same side of the open groove 13. The isolation boss 14 is used to isolate the connection structure 1 from the circuit board 4, and the metal pin mounting hole 15 is used to install a metal pin 16. The metal pin 16 is used to electrically connect the transformer wire led out from the transformer wire outlet and the open groove 13, as well as electrically connect the circuit board 4, thereby realizing electrical connection between the transformer 2 and the circuit board 4.

[0040] The hollow ring is the main body of the connection structure 1 of the embodiment of the present invention, which is used to fix and protect the mutual inductor 2. Among them, the mutual inductor 2 is an instrument that converts the large current on the primary side into a small current on the secondary side for measurement based on the principle of electromagnetic induction, and is usually composed of a closed iron core and a coil (winding). For example, the RCD involved in the embodiment of the present invention has no current breaking device inside, and it is required to verify the non-action current limit value under the condition of single-phase load overcurrent (i.e., symmetry experiment). Considering that the mutual inductor 2 needs to be resistant to static magnetic interference, it is necessary to set a shielding cover outside the mutual inductor 2. Among them, the shielding cover is a tool for shielding electronic signals, which can shield the influence of external electromagnetic waves on the internal circuit and prevent the electromagnetic waves generated inside from radiating outward. The material of the shielding cover is usually metal material.

[0041] The hollow ring includes a first shell 11 and a second shell 12. For example, both are annular; specifically, they each include an inner ring, an outer ring, and a bottom surface connecting the inner and outer rings. The first and second shells 11, 12 can be connected using a sleeve-type connection for easy assembly. When assembled, they form a cavity within the hollow ring for accommodating the transformer 2.

[0042] Specifically, if Figure 1 As shown, the outer ring edge diameter of the second shell 12 is smaller than the outer ring edge diameter of the first shell 11, allowing the outer ring of the second shell 12 to be inserted into the outer ring of the first shell 11. In other examples, the outer ring of the first shell 11 can also be configured to be inserted into the outer ring of the second shell 12. Because the hollow ring fully surrounds the transformer, the transformer 2 does not rub against the shield during assembly, making assembly convenient and less likely to damage the transformer. The shield can be adhesively fixed to the hollow ring without worrying about damaging the coil, making assembly easy and the structure stable.

[0043] A transformer wire outlet is provided on the side of the hollow ring for leading out the transformer wire. For example, a first opening is provided on the side wall of the first shell 11, and a second opening is provided on the side wall of the second shell 12. The first opening and the second opening are combined to form a square transformer wire outlet. The transformer wire outlet is used to lead out the transformer wire. In some embodiments, the transformer wire outlet can also be provided only in the first shell 11 or only in the second shell 12. The square opening is conducive to limiting the opening slot 13, but the shape of the transformer wire outlet is not limited to a square, and can also be a trapezoidal, elliptical or other suitable shapes. Since the hollow ring surrounding the transformer 2 is provided with an opening, it is convenient to pour glue into the hollow ring to further improve the stability of the structure. Alternatively, since the connection structure of the embodiment of the present invention is very stable, it is also possible to choose to use glue dispensing instead of glue pouring to save costs.

[0044] A slot 13, open at both ends, extends outward from the hollow ring's transformer conductor outlet. This slot serves to isolate and secure the hollow ring and circuit board 4, as well as to restrain the transformer conductors. Furthermore, the notches in the shielding cover engage the outer walls of slot 13, limiting the shielding cover's position and preventing it from rotating along the hollow ring's arcuate surface.

[0045] Illustratively, the open slot 13 can extend outward from the first opening of the first housing 11, thereby communicating with the interior of the hollow ring through the transformer wire outlet. The open slot 13 extends toward the center of the hollow ring. Illustratively, the height of the open slot 13 is higher than the upper surface of the first housing 11 (i.e., the top of the outer ring of the first housing 11) and lower than the upper surface of the second housing 12 (i.e., the bottom of the outer ring of the second housing 12), thereby providing sufficient space for the isolation boss 14 and the metal pin 16.

[0046] In one embodiment, the second opening of the second housing 12 engages the outer wall of the opening slot 13, limiting the opening slot 13 relative to the hollow ring and preventing it from rotating along the outer wall of the hollow ring. This also prevents relative rotation between the first housing 11 and the second housing 12. Alternatively, other limiting structures may be provided on the first housing 11 or the second housing 12 to prevent relative rotation between the first housing 11 and the second housing 12.

[0047] Exemplarily, the open slot 13 includes two sidewalls, one on each side, and a bottom connecting the sidewalls. A wire groove for leading out the transformer wires is formed between the sidewalls and the bottom. The transformer wires exit from the transformer wire outlet in the hollow ring, extend along the wire groove to the metal pins 16, and then electrically connect to the circuit board 4 connected to the metal pins 16.

[0048] In one example, the side wall of the opening groove 13 can be divided into two sections. The first section of the side wall adjacent to the hollow ring has a smaller thickness to reduce the size of the opening that needs to be set on the shielding cover; the second section of the side wall away from the hollow ring has a larger thickness to facilitate the setting of the isolation boss 14 and the metal pin mounting hole 15 on the second section of the side wall.

[0049] The isolation boss 14 and the metal pin mounting hole 15 are arranged on the same side of the opening slot 13 . Figures 1 to 5 An example of arranging the isolation boss 14 and the metal pin mounting hole 15 at the end of the open slot is shown. Figures 1 to 5 In the example, two isolation bosses are respectively provided at the ends of the left and right side walls of the opening slot 13, such as Figure 5As shown, the left sidewall end is provided with isolation bosses 141 and 142, and the right sidewall end is provided with isolation bosses 143 and 144, for a total of four isolation bosses arranged in a matrix to provide stable support. Isolation bosses 14 can be used to isolate the hollow ring from the circuit board 4 during soldering, thereby protecting the solder joints and facilitating soldering. In other embodiments, the number of isolation bosses 14 can also be greater or lesser, for example, three or five isolation bosses 14 can be provided.

[0050] In some embodiments, at least one isolation boss 14 is provided with a small cylindrical protrusion at its base. Accordingly, a slot corresponding to the securement latch 17 is provided on the surface of the circuit board 4, into which the latch 17 can be inserted during installation. Because the isolation boss 14 provides isolation when the hollow ring is welded to the circuit board 4, and the securement latch 17 provides positioning, assembly and welding of the circuit board 4 and the hollow ring are simplified, with minimal overall error and a high yield rate after dispensing.

[0051] The metal pin mounting holes 15 are used to mount metal pins 16, thereby electrically connecting the mutual inductor 2 to the circuit board 4 through the metal pins 16. It should be noted that the metal pins 16 are used to electrically connect the mutual inductor 2 and the circuit board, and they can also be made of other conductive materials, not limited to metal. For example, two metal pin mounting holes 15 are provided on the left and right side walls of the opening slot 13, which are arranged on the inner side of the isolation boss 14, so that the mutual inductor wires wrapped around the metal pins 16 are protected by the isolation boss 14; a total of four metal pin mounting holes are distributed in a matrix. During assembly, the four metal pins are respectively inserted into the metal pin mounting holes, and the mutual inductor wires are led out along the opening slot 13 and wrapped around and welded to the metal pins 16. Since the connection structure 1 is connected to the circuit board 4 through four metal pins 16 arranged in a matrix, the connection structure 1 and the circuit board 4 are stable. Since the transformer wire is led out along the opening slot 13 and wound around and welded on the metal pin 16, the transformer wire is not likely to be scratched by the shielding cover, which is not likely to cause damage to the wire.

[0052] In another embodiment, the isolation boss 14 and the metal pin mounting hole 15 may also be provided on the back side of the opening slot 13 . Accordingly, the circuit board 4 is also connected to the connection structure 1 through the back side of the opening slot 13 .

[0053] like Figure 6As shown, in one example, the sidewalls of the opening slot 13 are provided with an extension 18 perpendicular to the slot's extension direction. The isolation boss 14 and metal pin mounting hole 15 are located on the backside of the extension 18, opposite the wire duct. This embodiment thickens the sides of the opening slot, giving it an overall T-shape. At least one isolation boss 14 on the backside of the extension 18 has a foolproof latch 17 at its base for secure installation and positioning. Furthermore, an isolation structure 19 is provided at the end of the opening slot to isolate the shunt wires.

[0054] In another example, see Figure 7 The isolation boss 14 and metal pin mounting hole 15 are also located on the back of the open slot 13. The sidewalls of the open slot 13 are provided with a wire channel 111, which is perpendicular to the bottom of the open slot 13. In this embodiment, the side of the open slot 13 is thickened, and the metal pin 16 and isolation boss 14 are located at the bottom of the thickened body 110. A wire channel 111 is formed between two adjacent thickened bodies 110. The transformer wire is guided through the wire channel 111 to the back of the open slot 13, where it is then welded to the metal pin.

[0055] Based on the above description, the connection structure between the mutual inductor and the circuit board according to the embodiment of the present invention has at least one of the following advantages:

[0056] 1. The hollow ring surrounds the transformer, so the transformer will not rub against the shielding cover during assembly, which makes assembly convenient and less likely to cause damage to the transformer;

[0057] 2. The transformer wire is led out along the open slot and wound around the metal pin and welded. The transformer wire is not easy to be scratched by the shielding cover, which is not easy to cause damage to the wire;

[0058] 3. The hollow ring surrounding the transformer is provided with a transformer wire outlet, so it is convenient to fill glue (or you can choose not to fill glue);

[0059] 4. The shield is bonded and fixed to the hollow ring instead of the transformer, so it is easy to assemble and has a stable structure;

[0060] 5. The connection structure is connected to the circuit board through multiple metal pins, and the connection is stable;

[0061] 6. The connection structure is provided with multiple isolation bosses on the same side of the metal pins to isolate and position the connection structure and the circuit board during welding, thereby protecting the solder joints and facilitating welding;

[0062] 7. When the connection structure is welded on the circuit board, it is isolated by the isolation boss and has anti-foolproof buckle positioning, so it is easy to assemble and weld. After dispensing and welding, the overall error is small and the yield rate is high.

[0063] The embodiment of the present invention also provides a residual current detection device, such as Figure 1 As shown, the residual current detection device of the embodiment of the present invention includes a transformer 2, a circuit board 4, a metal pin, a shielding cover 3, and a connection structure 1 between the transformer and the circuit board. The shielding cover 3 is disposed outside the connection structure 1. The connection structure 1 includes a hollow ring and an open slot 13 connecting the hollow ring. The hollow ring is provided with a transformer wire outlet that communicates with the open slot 13. The open slot is provided with a metal pin mounting hole 15. The transformer 2 is disposed in the hollow ring. A metal pin 16 is mounted in the metal pin mounting hole 15 and electrically connected to the circuit board 4. The conductor of the transformer 2 is led out through the transformer wire outlet and the open slot 13 and electrically connected to the metal pin 16.

[0064] For example, the mutual inductor 2, the circuit board 4, and the shielding cover 3 are assembled on the connection structure 1 in the following manner:

[0065] First, install the transformer 2 within the hollow ring cavity. The transformer wires are routed through the open slots 13, wound around and soldered to four metal pins 16. Four isolation bosses 14 are placed against the surface of the circuit board 4. The cylindrical anti-mock latch 18 is inserted into the grooves of the circuit board 4, and the four metal pins 16 are inserted into the circuit board 4 for soldering. Specifically, the circuit board 4 is provided with slots corresponding to the four metal pins 16 and slots corresponding to the anti-mock latch 18.

[0066] Finally, the front cover body 31 and the rear cover body 32 of the shielding cover 3 are adhered to the hollow ring. The arc surface of the shielding cover 3 is provided with a notch. The notch of the shielding cover 3 is clamped on the outer wall of the opening groove 13. The shielding cover 3 is limited by the opening groove 13 so that the shielding cover 3 cannot be along the hollow ring, thereby realizing the connection between the mutual inductor 2, the circuit board 4 and the shielding cover 3.

[0067] The residual current detection device of the embodiment of the present invention connects the mutual inductor 2, the circuit board 4 and the shielding cover 3 in a safe, convenient and stable manner through the above connection structure.

[0068] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0069] Similarly, it should be understood that in order to streamline the present invention and aid in understanding one or more of the various inventive aspects, in the description of exemplary embodiments of the present invention, the various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this approach to the present invention should not be interpreted as reflecting the intention that the claimed invention requires more features than those explicitly recited in each claim. More precisely, as reflected in the corresponding claims, the inventive point is that the corresponding technical problem can be solved with fewer features than all the features of a single disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into the detailed description, with each claim itself serving as a separate embodiment of the present invention.

[0070] Those skilled in the art will understand that, except where mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or apparatus disclosed herein may be combined in any combination. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that provides the same, equivalent, or similar purpose.

[0071] Furthermore, those skilled in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are intended to be within the scope of the present invention and to form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

[0072] It should be noted that the above embodiments illustrate rather than limit the invention, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between brackets should not be construed as limiting the claims. The invention may be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

[0073] The foregoing description is merely a specific embodiment of the present invention or an illustration of a specific embodiment. The scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention are intended to be covered by the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A connection structure between a mutual inductor and a circuit board, characterized in that: include: A hollow ring, comprising a first shell and a second shell, both of which are annular, each comprising an inner ring, an outer ring, and a bottom surface connecting the inner ring and the outer ring. The first shell and the second shell are combined to form a cavity inside the hollow ring for accommodating a mutual inductor, wherein the mutual inductor comprises a closed iron core and a coil; A transformer wire outlet is provided on the side of the hollow ring; An open slot connected to the hollow ring, wherein both ends of the open slot are provided with openings, wherein the opening at one end is connected to the transformer wire outlet; An isolation boss and a metal pin mounting hole are provided on the open slot, the isolation boss and the metal pin mounting hole being provided on the same side of the open slot, the isolation boss being used to isolate the connection structure from the circuit board, the metal pin mounting hole being used to mount a metal pin, the metal pin being used to electrically connect the transformer wire led out from the transformer wire outlet and the open slot, and to electrically connect the circuit board; Among them, the outside of the hollow ring is used to set a shielding cover, and the shielding cover includes a front cover body and a rear cover body, both of which are circular rings. The front cover body and the rear cover body of the shielding cover are adhered to the hollow ring, and the arc surface of the shielding cover is provided with a notch, and the notch of the shielding cover is clamped on the outer wall of the opening groove, and the shielding cover is limited by the opening groove.

2. The connection structure between a mutual inductor and a circuit board according to claim 1, characterized in that: The first shell and the second shell are connected in a sleeve-type manner. The side wall of the first shell is provided with a first opening, and the side wall of the second shell is provided with a second opening. The first opening and the second opening together constitute the transformer wire outlet.

3. The connection structure between a mutual inductor and a circuit board according to claim 2, characterized in that: The opening slot is connected to the first shell, the height of the opening slot is higher than the first shell, and the second opening is used to limit the opening slot.

4. The connection structure between a mutual inductor and a circuit board according to claim 1, characterized in that: The isolation boss and the metal pin mounting hole are arranged at the end of the open slot.

5. The connection structure between a mutual inductor and a circuit board according to claim 4, characterized in that: Two isolation bosses and two metal pin mounting holes are respectively provided at the end of each side wall of the opening slot, and the metal pin mounting holes are provided on the inner side of the isolation bosses.

6. The connection structure between a mutual inductor and a circuit board according to any one of claims 1 to 5, characterized in that: At least one of the isolation bosses is provided with an anti-foolproof buckle at the bottom.

7. The connection structure between a mutual inductor and a circuit board according to claim 1, characterized in that: The isolation boss and the metal pin mounting hole are arranged on the back side of the opening slot.

8. The connection structure between a mutual inductor and a circuit board according to claim 7, characterized in that: The side wall of the opening slot is provided with an extension portion perpendicular to the extension direction of the opening slot, and the isolation boss and the metal pin mounting hole are provided on the back side of the extension portion; An isolation structure is provided at the end of the open slot.

9. The connection structure between a mutual inductor and a circuit board according to claim 7, characterized in that: The side wall of the opening slot is provided with a wire channel, and the wire channel is perpendicular to the bottom of the opening slot.

10. A residual current detection device, characterized in that: The invention comprises a mutual inductor, a circuit board, a metal pin, a shielding cover, and a connection structure between the mutual inductor and the circuit board according to any one of claims 1 to 9, wherein the shielding cover is arranged outside the connection structure; The shielding cover comprises a front cover body and a rear cover body, both of which are annular, the front cover body and the rear cover body of the shielding cover are adhered to the hollow ring, the arc surface of the shielding cover is provided with a notch, the notch of the shielding cover is clamped on the outer wall of the opening slot, and the shielding cover is limited by the opening slot; The connection structure includes a hollow ring and an open groove connected to the hollow ring, the hollow ring is provided with a mutual inductor wire outlet connected to the open groove, and the open groove is provided with a metal pin installation hole; The mutual inductor includes a closed iron core and a coil, and is arranged in the hollow ring. The metal pin is installed in the metal pin installation hole and is electrically connected to the circuit board. The wire of the mutual inductor is led out through the mutual inductor wire outlet and the open slot and is electrically connected to the metal pin.

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