CN220709241U - Connection structure of mutual inductor and circuit board and residual current detection device - Google Patents

Abstract

A connection structure of a transformer and a circuit board and a residual current detection device, the connection structure comprising: the hollow ring comprises a first shell and a second shell, and a cavity for accommodating the transformer is formed inside the hollow ring after the first shell and the second shell are combined; the wire outlet of the mutual inductor is arranged on the side surface of the hollow circular ring; the opening groove is connected with the hollow circular ring, openings are formed in two ends of the opening groove, and the opening at one end is communicated with the wire outlet of the transformer; the isolation boss and the metal pin mounting hole are arranged on the opening groove, the isolation boss and the metal pin mounting hole are arranged on the same side of the opening groove, the isolation boss is used for isolating the connecting structure and the circuit board, the metal pin mounting hole is used for mounting the metal pin, and the metal pin is used for electrically connecting the transformer wire led out from the transformer wire outlet and the opening groove and electrically connecting the circuit board. The connection structure of the transformer and the circuit board and the residual current detection device are safe and stable and easy to assemble.

Description

Connection structure of mutual inductor and circuit board and residual current detection device

Technical Field

The present utility model relates generally to the field of leakage detection, and more particularly to a connection structure of a transformer and a circuit board and a residual current detection device.

Background

The RCD (Residual Current Device, residual current detection device) is a device for detecting the magnitude of leakage current in a line. If no RCD is installed in the line, when a person or an animal touches high voltage, leakage current is generated to the ground, and when the leakage current exceeds a certain threshold value, heart vibration of the person or the animal is caused, sudden cardiac arrest is caused, and life is dangerous. If a leakage detection device such as an RCD is installed in the circuit, when leakage current exists in the circuit and the magnitude of a leakage current signal exceeds a set threshold value, the RCD can send an alarm signal to the action mechanism to trigger the action mechanism to rapidly break the circuit, so that the aim of protecting life safety is fulfilled.

The main structure of the RCD comprises a transformer and a circuit board. In view of the need for a transformer to be resistant to magnetostatic interference, a shield is required for the transformer. In the current RCD, the connection structure of the transformer and the circuit board does not surround the protection coil, and the shielding case is directly adhered to the coil of the transformer. Before and after the shielding cover is installed, the coil is exposed outside, so the coil is easy to damage and short-circuit, the shielding cover is adhered to the coil, the structure of the coil is unstable, and the shielding cover needs to be installed carefully. After the shielding cover is installed, the coil outgoing line part is free of channels, the outgoing line of the transformer wire is close to the shielding cover, the wire is easy to contact with the shielding cover, production and installation are troublesome, and the outgoing line wire is easy to scratch and short-circuit. In addition, the connection structure is only connected with the circuit board through a single row of metal PINs (PIN), so that the connection is not firm and easy to deform.

Disclosure of Invention

In the summary, a series of concepts in a simplified form are introduced, which will be further described in detail in the detailed description. The summary of the present application is not intended to define the key features and essential features of the claimed subject matter, nor is it intended to be used to determine the scope of the claimed subject matter.

In one aspect, an embodiment of the present utility model provides a connection structure between a transformer and a circuit board, including:

the hollow circular ring comprises a first shell and a second shell, and a cavity for accommodating a transformer is formed inside the hollow circular ring after the first shell and the second shell are combined;

the transformer wire outlet is arranged on the side surface of the hollow circular ring;

the opening grooves are connected with the hollow circular ring, openings are formed in two ends of each opening groove, and the opening at one end is communicated with the wire outlet of the mutual inductor;

the isolation boss is arranged on the opening groove, the isolation boss is arranged on the same side of the opening groove, the isolation boss is used for isolating the connecting structure and the circuit board, the metal pin mounting hole is used for mounting the metal pin, and the metal pin is used for electrically connecting the transformer wire led out from the transformer wire outlet and the opening groove and electrically connecting the circuit board.

In one embodiment, the first shell and the second shell are connected in a sleeve type, a first opening is formed in the side wall of the first shell, a second opening is formed in the side wall of the second shell, and the first opening and the second opening are combined to form the wire outlet of the transformer.

In one embodiment, the open slot is connected to the first housing, the height of the open slot is higher than that of the first housing, and the second opening is used for limiting the open slot.

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

In one embodiment, the end of each side wall of the open slot is respectively provided with two bosses and two metal pin mounting holes, and the metal pin mounting holes are arranged on the inner sides of the bosses.

In one embodiment, at least one boss bottom is provided with a foolproof catch.

In one embodiment, the boss and the metal pin mounting hole are disposed on a back side of the open slot.

In one embodiment, the side wall of the open slot is provided with an extension part perpendicular to the extending direction of the open slot, and the boss and the metal pin mounting hole are arranged on the back surface of the extension part;

an isolation structure is arranged at the end part of the open slot.

In one embodiment, the side walls of the open slot are provided with wire channels that are perpendicular to the bottom of the open slot.

The embodiment of the utility model provides a residual current detection device, which comprises a mutual inductor, a circuit board, a metal contact pin, a shielding cover and a connection structure of the mutual inductor and the circuit board, wherein the shielding cover is arranged outside the connection structure;

the connecting structure comprises a hollow circular ring and an open slot connected with the hollow circular ring, wherein the hollow circular ring is provided with a transformer wire outlet communicated with the open slot, and the open slot is provided with a metal contact pin mounting hole;

the transformer is arranged in the hollow circular ring, the metal contact pin is arranged in the metal contact pin mounting hole and is electrically connected with the circuit board, and a wire of the transformer is led out through the wire outlet of the transformer and the open slot and is electrically connected with the metal contact pin.

The connection structure of the transformer and the circuit board and the residual current detection device are safe and stable and are easy to assemble.

Drawings

The foregoing and other objects, features and advantages of the present application will become more apparent from the following more particular description of embodiments of the present application, as illustrated in the accompanying drawings. The accompanying drawings are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate the application and not constitute a limitation to the application. In the drawings, like reference numerals generally refer to like parts or steps.

Fig. 1 is a schematic diagram of an installation mode of a connection structure of a transformer and a circuit board according to an embodiment of the present utility model;

fig. 2 is a perspective view showing a connection structure of a transformer and a circuit board according to an embodiment of the present utility model;

fig. 3 is a front view showing a connection structure of a transformer and a circuit board according to an embodiment of the present utility model;

FIG. 4 is a side view of the connection structure of the transformer and the circuit board of one embodiment of the present utility model;

fig. 5 is a bottom view of a connection structure of a transformer and a circuit board according to an embodiment of the present utility model;

fig. 6 is a perspective view showing a connection structure of a transformer and a circuit board according to another embodiment of the present utility model;

fig. 7 is a perspective view showing a connection structure of a transformer and a circuit board according to still another embodiment of the present utility model.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present utility model. It will be apparent, however, to one skilled in the art that the utility model may be practiced without one or more of these details. In other instances, well-known features have not been described in detail in order to avoid obscuring the utility model.

It should be understood that the present utility model may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art. In the drawings, the size of layers and regions, as well as the relative sizes, may be exaggerated for clarity. Like numbers refer to like elements throughout.

It will be understood that when an element or layer is referred to as being "on," "adjacent," "connected to," or "coupled to" another element or layer, it can be directly on, adjacent, connected, or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, 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 present. It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present utility model.

Spatially relative terms, such as "under," "below," "beneath," "under," "above," "over," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "under" or "beneath" other elements would then be oriented "on" the other elements or features. Thus, the exemplary terms "below" and "under" may include both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.

In order to provide a thorough understanding of the present utility model, detailed structures will be presented in the following description in order to illustrate the technical solutions presented by the present utility model. Preferred embodiments of the present utility model are described in detail below, however, the present utility model may have other embodiments in addition to these detailed descriptions.

Aiming at the problems of the connection structure of the mutual inductor and the circuit board in the current RCD, the embodiment of the utility model provides the connection structure of the mutual inductor and the circuit board and the residual current detection device, and the connection structure of the embodiment of the utility model can safely and firmly connect the mutual inductor and the circuit board and is easy to assemble.

The connection structure of the transformer and the circuit board and the residual current detection device according to the embodiment of the utility model are described in detail below with reference to the accompanying drawings. The features of the examples and embodiments described below may be combined with each other without conflict.

Referring to fig. 1 to 7, a connection structure 1 of a transformer and a circuit board according to an embodiment of the present utility model includes: the hollow ring comprises a first shell 11 and a second shell 12, and a cavity for accommodating the transformer 2 is formed inside the hollow ring after the first shell 11 and the second shell 12 are combined; the wire outlet of the mutual inductor is arranged on the side surface of the hollow circular ring; the opening groove 13 is connected with the hollow circular ring, openings are formed in two ends of the opening groove 13, and the opening at one end is communicated with the wire outlet of the transformer; the isolation boss 14 and the metal pin mounting hole 15 are arranged on the open slot 13, the isolation boss 14 and the metal pin mounting hole 15 are arranged on the same side of the open slot 13, the isolation boss 14 is used for isolating the connecting structure 1 and the circuit board 4, the metal pin mounting hole 15 is used for mounting the metal pin 16, the metal pin 16 is used for electrically connecting the transformer wire led out from the transformer wire outlet and the open slot 13 and electrically connecting the circuit board 4, and therefore the electrical connection between the transformer 2 and the circuit board 4 is achieved.

The hollow circular ring is a main body of the connecting structure 1 of the embodiment of the utility model and is used for fixing and protecting the transformer 2. The transformer 2 is an instrument for converting primary side large current into secondary side small current according to electromagnetic induction principle, and is usually composed of a closed iron core and a coil (winding). Illustratively, the RCD internal no-current breaking device according to the embodiment of the present utility model requires verification of the non-operating current limit value (i.e., symmetry experiment) under the condition of single-phase load overcurrent, and in consideration of the need of the transformer 2 to resist static magnetic interference, a shielding case needs to be provided outside the transformer 2. The shielding cover is a tool for shielding electronic signals, can shield the influence of external electromagnetic waves on an internal circuit and prevent electromagnetic waves generated in the internal circuit from radiating outwards, and is usually made of metal materials.

The hollow circular ring comprises a first housing 11 and a second housing 12, and the first housing 11 and the second housing 12 are circular ring-shaped in an exemplary manner; specifically, the first housing 11 and the second housing 12 each include an inner ring, an outer ring, and a bottom surface connecting the inner ring and the outer ring. The first housing 11 and the second housing 12 may be connected by a sleeve-type connection which is easy to assemble, and after the assembly, a cavity for accommodating the transformer 2 is formed inside the hollow circular ring.

Specifically, as shown in fig. 1, the outer ring edge diameter of the second housing 12 is smaller than the outer ring edge diameter of the first housing 11, so that the outer ring of the second housing 12 can be inserted into the outer ring interior of the first housing 11. In other examples, the outer ring of the first housing 11 may be provided so as to be insertable into the inside of the outer ring of the second housing 12. Because the hollow circular ring fully surrounds the transformer, the transformer 2 is not scratched with the shielding cover during assembly, and the assembly is convenient and fast, and the transformer is not easy to damage. The shielding cover can be adhered and fixed on the hollow circular ring, the coil is not required to be damaged, the assembly is convenient, and the structure is stable.

The side of the hollow circular ring is provided with a transformer wire outlet for leading out a transformer wire. Illustratively, the side wall of the first housing 11 is provided with a first opening and the side wall of the second housing 12 is provided with a second opening, the first opening and the second opening in combination constituting a square transformer wire outlet. The transformer wire outlet is used for leading out a transformer wire. In some embodiments, the transformer wire outlet may also be provided only in the first housing 11 or only in the second housing 12. The square opening is beneficial to limit the open slot 13, but the shape of the transformer wire outlet is not limited to square, but may be trapezoidal, oval or other suitable shape. Because the hollow circular ring surrounding the transformer 2 is provided with an opening, glue can be conveniently filled into the hollow circular ring, so that the stability of the structure is further improved. Or, because the connecting structure of the embodiment of the utility model is very stable, the glue pouring can be replaced by dispensing to save the cost.

The opening groove 13 with two open ends is extended outwards from the outlet of the transformer wire of the hollow circular ring, and the function of the opening groove is to isolate and fix the hollow circular ring and the circuit board 4 and to restrain the transformer wire. And the notch of the shielding cover can clamp the outer wall of the open slot 13, and the shielding cover is limited through the open slot 13, so that the shielding cover cannot rotate along the arc surface of the hollow circular ring.

Illustratively, the open slot 13 may extend outwardly from the first opening of the first housing 11 to communicate with the interior of the hollow annulus through the transformer wire outlet. The extending direction of the open slot 13 is towards the center of the hollow circular ring. Illustratively, the height of the open groove 13 is higher than the upper surface of the first housing 11 (i.e., the top end of the outer ring of the first housing 11) and lower than the upper surface of the second housing 12 (i.e., the bottom end of the outer ring of the second housing 12), thereby providing sufficient space for the boss 14 and the metal pins 16.

In one embodiment, the second opening of the second housing 12 catches the outer wall of the open slot 13, such that the open slot 13 is limited relative to the hollow ring and cannot rotate along the outer wall of the hollow ring, i.e., the first housing 11 and the second housing 12 cannot rotate relative to each other. Alternatively, other forms of limiting structures may be provided on the first housing 11 or the second housing 12, so that the first housing 11 and the second housing 12 cannot rotate relatively.

Illustratively, the open slot 13 includes left and right side walls and a bottom connecting the side walls, and a wire slot for drawing out the wire of the transformer is formed between the side walls and the bottom. The transformer wire is led out from the transformer wire outlet of the hollow circular ring, extends to the metal pin 16 along the wire groove, and is electrically connected with the circuit board 4 connected with the metal pin 16.

In one example, the side wall of the open slot 13 may be divided into two sections, and the side wall of the first section adjacent to the hollow circular ring has a smaller thickness, so as to reduce the size of the opening to be provided in the shielding case; the second section side wall remote from the hollow annular ring has a greater thickness so that bosses 14 and metal pin mounting holes 15 are provided on the second section side wall.

The boss 14 and the metal pin mounting hole 15 are provided on the same side of the open groove 13. Fig. 1 to 5 show an example in which the boss 14 and the metal pin mounting hole 15 are provided at the open groove end. In the examples of fig. 1 to 5, two bosses are respectively disposed at the ends of the left and right side walls of the open slot 13, as shown in fig. 5, a boss 141 and a boss 142 are disposed at the end of the left side wall, and a boss 143 and a boss 144 are disposed at the end of the right side wall, and the four bosses are distributed in a matrix to provide stable support. The boss 14 may be used to isolate the hollow ring from the circuit board 4 during soldering, thereby protecting the solder joint and facilitating soldering. In other embodiments, the number of bosses 14 may be greater or lesser, for example, three or five bosses 14 may be provided.

In some embodiments, the bottom of at least one boss 14 is provided with a foolproof catch 17, the foolproof catch 17 may be a small cylindrical protrusion. Correspondingly, the surface of the circuit board 4 is provided with a clamping groove corresponding to the foolproof clamping buckle 17, and the clamping buckle 17 can be inserted into the clamping groove during installation. Because the boss 14 is used as isolation when the hollow circular ring is welded on the circuit board 4, and the fool-proof buckle 17 is used for positioning, the circuit board 4 and the hollow circular ring are easy to assemble and weld when being welded, and the overall error after glue dispensing and welding is small, so that the yield is high.

The metal pin mounting holes 15 are used to mount metal pins 16 so that the transformer 2 is electrically connected 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 transformer 2 and the circuit board, and other conductive materials may be used, and are not limited to metal. Illustratively, the left and right side walls of the open slot 13 are respectively provided with two metal pin mounting holes 15, which are disposed inside the boss 14, so as to protect the transformer wire wound on the metal pins 16 by the boss 14; the four metal contact pin mounting holes are distributed in a matrix. At the time of assembly, four metal pins are respectively inserted into the metal pin mounting holes, and the transformer wires are led out along the open slots 13 and wound and welded on the metal pins 16. Since the connection structure 1 is connected with the circuit board 4 through the four metal pins 16 arranged in a matrix, the connection structure 1 and the circuit board 4 are stable. Because the transformer wire is led out along the open slot 13 and is wound and welded on the metal contact pin 16, the transformer wire is not easy to scratch with the shielding cover, and the wire is not easy to damage.

In another embodiment, the boss 14 and the metal pin mounting hole 15 may also be provided on the back surface of the open slot 13, and accordingly, the circuit board 4 is also connected to the connection structure 1 through the back surface of the open slot 13.

As shown in fig. 6, in one example, the side wall of the open groove 13 is provided with an extension 18 perpendicular to the extending direction of the open groove, and the boss 14 and the metal pin mounting hole 15 are provided on the back surface of the extension 18, i.e., in the opposite direction to the wire groove. In the embodiment, the side surface of the open slot is thickened, so that the open slot is T-shaped as a whole. The bottom of at least one boss 14 arranged on the back of the extension 18 is provided with a foolproof catch 17 for mounting and positioning. Further, an isolation structure 19 is provided at the end of the open slot for isolating the shunt wire.

In another example, referring to fig. 7, the boss 14 and the metal pin mounting hole 15 are also provided at the back of the open groove 13, and the side wall of the open groove 13 is provided with a wire passage 111, the wire passage 111 being perpendicular to the bottom of the open groove 13. In this embodiment, the side surface of the open slot 13 is thickened, and the metal pins 16 and the boss 14 are disposed at the bottom of the thickened body 110. A wire channel 111 is formed between two adjacent thickened bodies 110, and the wires of the mutual inductor are led out from the wire channel 111 to the back of the open slot 13, so that the wires are welded on the metal pins.

Based on the above description, the connection structure of the transformer and the circuit board according to the embodiment of the present utility model has at least one of the following advantages:

1. the hollow circular ring surrounds the transformer, the transformer is not scratched with the shielding cover during assembly, the assembly is convenient, and the transformer is not easy to damage;

2. the transformer wire is led out along the open slot and is wound and welded on the metal contact pin, so that the transformer wire is not easy to scratch with the shielding cover and is not easy to damage;

3. the hollow circular ring surrounding the transformer is provided with a transformer wire outlet, so that the glue filling is convenient to select (or the glue filling can be selected not to be performed);

4. the shielding cover is adhered and fixed on the hollow circular ring instead of the transformer, so that the assembly is convenient, and the structure is stable;

5. the connecting structure is connected with the circuit board through a plurality of metal pins, so that the connection is stable;

6. the connecting structure is provided with a plurality of bosses on the same side of the metal contact pin, so that the connecting structure and the circuit board are isolated and positioned during welding, welding spots are protected, and welding is convenient;

7. the connecting structure is welded on the circuit board with boss isolation and foolproof buckle positioning, so that the assembly and welding are easy, the integral error after the spot gluing and welding is small, and the yield is high.

The embodiment of the utility model also provides a residual current detection device, as shown in fig. 1, which comprises a transformer 2, a circuit board 4, a metal contact pin, a shielding case 3 and a connection structure 1 of the transformer and the circuit board. Wherein the shielding case 3 is arranged outside the connection structure 1; the connecting structure 1 comprises a hollow circular ring and an open slot 13 connected with the hollow circular ring, the hollow circular ring is provided with a transformer wire outlet communicated with the open slot 13, and the open slot is provided with a metal contact pin mounting hole 15; the transformer 2 is arranged in a hollow circular ring, and the metal pins 16 are installed in the metal pin installation holes 15 and electrically connected with the circuit board 4, and wires of the transformer 2 are led out through the transformer wire outlets and the open slots 13 and electrically connected with the metal pins 16.

Illustratively, the transformer 2, the circuit board 4, and the shield 3 are assembled to the connection structure 1 in the following manner:

firstly, the transformer 2 is arranged in a cavity of a hollow circular ring, and a wire of the transformer is led out along an opening groove 13 and is wound and welded on four metal pins 16. The four bosses 14 are attached to the surface of the circuit board 4, the cylindrical foolproof buckles 18 are inserted into grooves of the circuit board 4, and the four metal pins 16 are inserted into the circuit board 4 for welding. Namely, the circuit board 4 is provided with slots corresponding to the four metal pins 16 and clamping grooves corresponding to the fool-proof buckles 18.

Finally, the front cover body 31 and the rear cover body 32 of the shielding cover 3 are adhered to the hollow circular ring, the cambered 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 open slot 13, the shielding cover 3 is limited through the open slot 13, and the shielding cover 3 cannot follow the hollow circular ring, so that the connection of the transformer 2, the circuit board 4 and the shielding cover 3 is realized.

The details of the connection structure of the residual current detection device in the embodiment of the present utility model may be referred to above, and will not be described herein. The residual current detection device of the embodiment of the utility model connects the mutual inductor 2, the circuit board 4 and the shielding case 3 safely, conveniently and firmly through the connecting structure.

In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the utility model may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Similarly, it should be appreciated that in order to streamline the utility model and aid in understanding one or more of the various inventive aspects, various features of the utility model are sometimes grouped together in a single embodiment, figure, or description thereof in the description of exemplary embodiments of the utility model. However, the method of the present utility model should not be construed as reflecting the following intent: i.e., the claimed utility model requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this utility model.

It will be understood by those skilled in the art that all of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or units of any method or apparatus so disclosed, may be combined in any combination, except combinations where the features are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the utility model and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

It should be noted that the above-mentioned embodiments illustrate rather than limit the utility model, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The utility model may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order. These words may be interpreted as names.

The foregoing description is merely illustrative of specific embodiments of the present utility model and the scope of the present utility model is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present utility model should be included in the scope of the present utility model. The protection scope of the utility model is subject to the protection scope of the claims.

Claims (10)

1. A connection structure of a transformer and a circuit board, comprising:

the hollow circular ring comprises a first shell and a second shell, and a cavity for accommodating a transformer is formed inside the hollow circular ring after the first shell and the second shell are combined;

the transformer wire outlet is arranged on the side surface of the hollow circular ring;

the opening grooves are connected with the hollow circular ring, openings are formed in two ends of each opening groove, and the opening at one end is communicated with the wire outlet of the mutual inductor;

the isolation boss is arranged on the opening groove, the isolation boss is arranged on the same side of the opening groove, the isolation boss is used for isolating the connecting structure and the circuit board, the metal pin mounting hole is used for mounting the metal pin, and the metal pin is used for electrically connecting the transformer wire led out from the transformer wire outlet and the opening groove and electrically connecting the circuit board.

2. The connection structure of the transformer and the circuit board according to claim 1, wherein the first housing and the second housing are connected in a sleeve type, a first opening is formed in a side wall of the first housing, a second opening is formed in a side wall of the second housing, and the first opening and the second opening are combined to form the transformer wire outlet.

3. The connection structure of the transformer and the circuit board according to claim 2, wherein the open slot is connected to the first housing, the open slot is higher than the first housing, and the second opening is used for limiting the open slot.

4. The connection structure of the transformer and the circuit board according to claim 1, wherein the boss and the metal pin mounting hole are provided at an end of the open slot.

5. The connection structure of the transformer and the circuit board according to claim 4, wherein the end of each side wall of the open slot is provided with two bosses and two metal pin mounting holes, respectively, which are provided inside the bosses.

6. The connection structure of a transformer and a circuit board according to any one of claims 1 to 5, wherein at least one boss bottom is provided with a foolproof buckle.

7. The connection structure of the transformer and the circuit board according to claim 1, wherein the boss and the metal pin mounting hole are provided at a back surface of the open slot.

8. The connection structure of the transformer and the circuit board according to claim 7, wherein the side wall of the open slot is provided with an extension portion perpendicular to the extending direction of the open slot, and the boss and the metal pin mounting hole are provided on the back surface of the extension portion;

an isolation structure is arranged at the end part of the open slot.

9. The connection structure of the transformer and the circuit board according to claim 7, wherein a side wall of the open slot is provided with a wire passage, the wire passage being perpendicular to a bottom of the open slot.

10. A residual current detection device, comprising a transformer, a circuit board, a metal pin, a shield, and a connection structure of the transformer and the circuit board according to any one of claims 1 to 9, wherein the shield is disposed outside the connection structure;

the connecting structure comprises a hollow circular ring and an open slot connected with the hollow circular ring, wherein the hollow circular ring is provided with a transformer wire outlet communicated with the open slot, and the open slot is provided with a metal contact pin mounting hole;

the transformer is arranged in the hollow circular ring, the metal contact pin is arranged in the metal contact pin mounting hole and is electrically connected with the circuit board, and a wire of the transformer is led out through the wire outlet of the transformer and the open slot and is electrically connected with the metal contact pin.