Current detection device

Abstract

A current detection device comprises a first circuit board, a conductive column, a current detection ring, a current sensor and a second circuit board. The conductive column passes through the first circuit board. The current detection ring surrounds the periphery of the conductive column, the current detection ring comprises an arc-shaped metal core and an integrated wrapping injection plastic part, and the arc-shaped metal core is wrapped by the integrated wrapping injection plastic part. The current sensor is located in the notch of the arc-shaped metal core, and an electrode pin of the current sensor is electrically connected to the first circuit board. The conductive column is fixed on the second circuit board, and the current detection ring is located between the first circuit board and the second circuit board.

Description

Technical Field

[0001] The present invention relates to a current detection device. Background Art

[0002] Current motor controllers commonly use a toroidal metal core (e.g., made of suitable materials such as iron core, silicon steel sheet or alloy) in combination with a current detection chip to achieve current detection. The known current detection device requires separate mold opening to manufacture the upper and lower covers of the toroidal metal core, place the toroidal metal core into the lower cover for bonding, and then apply a circle of glue to assemble the upper cover. Before inserting the assembled toroidal metal core plug-in, glue also needs to be applied on the circuit board, and then the toroidal metal core is aligned with the current detection chip and bonded to the circuit board.

[0003] The process of the known current detection device is complex and the assembly method is cumbersome, which will not only reduce the mass production efficiency, but also the errors during assembly will cause a reduction in performance and even abnormal operation. Summary of the Invention

[0004] The present invention proposes a current detection device to solve the problems of the prior art.

[0005] According to some embodiments of the present invention, a current detection device includes a first circuit board, a conductive column, a current detection loop, a current sensor and a second circuit board. The conductive column penetrates through the first circuit board. The current detection loop surrounds the conductive column, wherein the current detection loop includes an arc-shaped metal core and an integrally injection-molded plastic part that covers the arc-shaped metal core. The current sensor is located at the notch of the arc-shaped metal core, and the electrode pins of the current sensor are inserted into the first circuit board. The conductive column is fixed on the second circuit board, and the current detection loop is located between the first circuit board and the second circuit board.

[0006] Optionally, the conductive column includes a bottom copper column and an upper copper column, wherein the bottom copper column is fixed on the second circuit board and the upper copper column is fixed on the bottom copper column.

[0007] Optionally, the current detection loop includes a depression, and the current sensor is located in the depression.

[0008] Optionally, a fixing colloid is further filled into the depression to fix the current sensor, and the electrode pins of the current sensor are exposed outside the fixing colloid.

[0009] Optionally, it further includes a housing, and the housing includes a groove that accommodates the first circuit board, the second circuit board, the current detection loop, the current sensor and the conductive column.

[0010] Optionally, it further includes a waterproof and heat-dissipating colloid, which is located in the groove and covers at least part of the first circuit board, the second circuit board, the current detection loop, and the current sensor.

[0011] Optionally, the integrated injection-molded plastic part includes a pair of snap posts, and the first circuit board includes a pair of snap holes, and the pair of snap posts are respectively inserted into the pair of snap holes.

[0012] Optionally, the integrated injection-molded plastic part includes a recess, and the current sensor is located in the recess; the recess and the pair of snap posts are on the same surface of the integrated injection-molded plastic part.

[0013] Optionally, it further includes a stud, and both ends of the stud are respectively fixed to the first circuit board and the second circuit board.

[0014] Optionally, it further includes a waterproof and heat-dissipating colloid, which covers at least part of the first circuit board, the second circuit board, the current detection loop, and the current sensor.

[0015] In summary, the current detection loop used in the current detection device of the present invention includes an arc-shaped metal core and an integrated injection-molded plastic part. The integrated injection-molded plastic part covers the arc-shaped metal core, so that the external dimensions of the current detection loop of the present invention can be smaller than those of the current detection loop assembled with multiple parts, improving the space utilization rate. The current detection loop includes a recess corresponding to the notch of the arc-shaped metal core, and the current sensor is placed in the recess to facilitate subsequent encapsulation and fixation with glue. The above design can prevent the internal stress or thermal expansion and contraction of the glue from changing the positions of the metal core or the current sensor, resulting in current detection errors.

[0016] Hereinafter, the above description will be described in detail by way of embodiments, and further explanations will be provided for the technical solutions of the present invention. Description of the Drawings

[0017] To make the above and other objects, features, advantages and embodiments of the present invention more obvious and understandable, the description of the drawings is as follows:

[0018] Figure 1 is a perspective view showing an embodiment of the current detection device of the present invention;

[0019] Figure 2 is a perspective view showing Figure 1 the current detection device after removing the waterproof and heat-dissipating colloid;

[0020] Figure 3 is a perspective view showing Figure 2 a magnified view of some components of the current detection device;

[0021] Figure 4 is a perspective view showing an arc-shaped metal core of an embodiment of the present invention;

[0022] Figure 5 is a perspective view of a current detection loop and a current sensor showing an embodiment of the present innovation; and

[0023] Figure 6 is a perspective view of a current sensor installed in the current detection loop showing an embodiment of the present innovation.

[0024] Description of Reference Numerals

[0025] 100: Current detection device

[0026] 110: First circuit board

[0027] 110a: Through hole

[0028] 110b: Snap hole

[0029] 120: Second circuit board

[0030] 130: Current detection loop

[0031] 131: Arc-shaped metal core

[0032] 131a: Notch

[0033] 132: Conductive post

[0034] 133: Bottom copper post

[0035] 134: Upper copper post

[0036] 136: Integrated encapsulation plastic part

[0037] 136a: Snap post

[0038] 136b: Fixing colloid

[0039] 136c: Depression

[0040] 138: Current sensor

[0041] 138a: Electrode pin

[0042] 150: Housing

[0043] 154: Groove

[0044] 154a: Screw hole

[0045] 155: Stud

[0046] 157: Screw

[0047] 160: Waterproof and heat-dissipating colloid Detailed implementation manners

[0048] For a more detailed and complete description of the present invention, reference may be made to the accompanying drawings and the various embodiments described below. The same reference numerals in the drawings represent the same or similar components. On the other hand, well-known components and steps are not described in the embodiments to avoid unnecessary limitations to the present invention. In the embodiments and the claims, unless otherwise specifically defined in the context, the articles "a" and "the" may refer to a single or multiple.

[0049] Please also refer to Figure 1 、 Figure 2 、 Figure 3 , Figure 1 FIG. 13 shows a perspective view of a current detection device 100 according to an embodiment of the present invention, Figure 2 showing Figure 1 an exploded view of the current detection device 100 of Figure 3 showing Figure 2 a perspective view of some components of the current detection device 100 of

[0050] In this embodiment, the conductive post 132 includes a bottom copper post 133 and an upper copper post 134. The bottom copper post 133 is fixed to the second circuit board 120 and electrically connected to the second circuit board 120. The upper copper post 134 is fixed to the bottom copper post 133 by means of locking, plugging or welding to ensure the electrical connection between them. In other embodiments, the conductive post 132 may also be an integral column or a column assembled from multiple components according to design considerations.

[0051] In this embodiment, the housing 150 includes a groove 154 for accommodating at least part of the components of the current detection device 100. The bottom of the groove 154 includes a threaded hole 154a, and a stud 155 is locked to the threaded hole 154a to fix the second circuit board 120 to the bottom of the groove 154. Furthermore, when a screw 157 is locked to the top of the stud 155, the first circuit board 110 is fixed to the top of the stud 155. The stud 155 is located between two conductive posts 132 to provide the required spacing and support between the first circuit board 110 and the second circuit board 120.

[0052] In this embodiment, after components such as the first circuit board 110, the second circuit board 120, the current detection ring 130, and the conductive posts 132 are accommodated in the groove 154, a waterproof and heat-dissipating glue can be filled into the groove 154 to form a solidified waterproof and heat-dissipating colloid 160 to cover all or part of the components such as the first circuit board 110, the second circuit board 120, the current detection ring 130, and the conductive posts 132. The waterproof and heat-dissipating colloid 160 helps with the heat dissipation of the first circuit board 110, the second circuit board 120, the current detection ring 130, and the conductive posts 132 and achieves the purpose of sealing and waterproofing. In another embodiment, the current detection device 100 is not installed in the housing 150, and the waterproof and heat-dissipating colloid 160 directly covers at least part of the first circuit board 110, the second circuit board 120, the current detection ring 130, and the current sensor 138.

[0053] Please refer to Figure 4 , Figure 5 , Figure 6 , Figure 4 A perspective view of the arc-shaped metal core 131 showing an embodiment of the present invention, Figure 5 is a perspective view of the current detection ring 130 and the current sensor 138 showing an embodiment of the present invention, Figure 6 A perspective view showing the current sensor 138 installed in the current detection ring 130 in an embodiment of the present invention. In this embodiment, the current detection ring 130 includes an arc-shaped metal core 131 and an integrally injection-molded plastic part 136. The integrally injection-molded plastic part 136 covers the arc-shaped metal core 131 to fix the arc-shaped metal core 131 and keep it from being exposed. In this embodiment, the arc-shaped metal core 131 is made of silicon steel sheet and is C-shaped. The notch 131a of the C-shape serves as the accommodation space for the current sensor 138. The electromagnetic field changes generated by the conductive posts 132 are generated in the arc-shaped metal core 131 of the current detection ring 130. The current sensor 138 located at the notch 131a of the arc-shaped metal core 131 is used to measure the electromagnetic field changes.

[0054] In this embodiment, the integrally injection-molded plastic part 136 wraps around the arc-shaped metal core 131 and is annular, and the current detection loop 130 includes a recess 136c for accommodating the current sensor 138. In another embodiment, the integrally injection-molded plastic part 136 wraps around the arc-shaped metal core 131 and is C-shaped, and the recess of the current detection loop 130 is a C-shaped notch for accommodating the current sensor 138. In another embodiment, the integrally injection-molded plastic part 136 wraps around the arc-shaped metal core 131 and is square or other suitable shape, and includes a recess for accommodating the current sensor 138. In another embodiment, when the current sensor 138 is placed in the recess 136c, a fixing colloid 136b is poured into the recess 136c, and the fixing colloid 136b solidifies to fix the current sensor 138. The fixing colloid 136b can be made of a suitable material such as silica gel. After the current sensor 138 is wrapped and fixed by the fixing colloid 136b, only the electrode pins 138a will be exposed outside the fixing colloid 136b to be electrically connected to the first circuit board 110 by means of insertion or welding, etc., so that the electromagnetic field change signal detected by the current sensor 138 can be transmitted to the first circuit board 110 through the electrode pins 138a for subsequent processing and calculation. In this embodiment, the integrally injection-molded plastic part 136 includes a pair of snap posts 136a, and the pair of snap posts 136a are respectively used to insert into a pair of corresponding snap holes 110b on the first circuit board 110 (refer to Figure 2 ). The snap posts 136a and the recess 136c are located on the same surface of the integrally injection-molded plastic part 136, thereby fixing the current detection loop 130 to the first circuit board 110 and enabling the electrode pins 138a to be inserted into the first circuit board 110 at the same time. In another embodiment, after the current sensor 138 is electrically connected to the first circuit board 110, a fixing colloid 136b is poured into the recess 136c of the integrally injection-molded plastic part 136, and then the current detection loop 130 is fixed to the first circuit board 110, and the recess 136c covers and fixes the current sensor 138.

[0055] The current detection loop used in the current detection device of the present invention includes an arc-shaped metal core and an integrally injection-molded plastic part. The integrally injection-molded plastic part wraps around the arc-shaped metal core, so that the external dimensions of the current detection loop of the present invention can be smaller than those of the current detection loop assembled with multiple parts, improving the space utilization rate. The current detection loop includes a recess corresponding to the notch of the arc-shaped metal core, and the current sensor is placed at the recess for subsequent pouring of glue for wrapping and fixing. The above design can avoid the internal stress or thermal expansion and contraction of the glue material from changing the position of the metal core or the current sensor, resulting in current detection errors.

[0056] Although the present invention has been disclosed as above in the form of embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to that defined by the appended patent application scope.

Claims

1. A current detection device, wherein: Include: a first circuit board; a second circuit board; a conductive post fixed to the second circuit board and passing through the first circuit board; and a current detection ring, surrounding the conductive column and located between the first circuit board and the second circuit board, wherein the current detection ring comprises an arc-shaped metal core and an integrated injection-molded plastic part, wherein the integrated injection-molded plastic part covers the arc-shaped metal core; A current sensor is located in the notch of the arc-shaped metal core, and the electrode pins of the current sensor are inserted into the first circuit board.

2. The current detection device according to claim 1, wherein: The conductive column comprises a bottom copper column and an upper copper column, wherein the bottom copper column is fixed to the second circuit board, and the upper copper column is fixed to the bottom copper column.

3. The current detection device according to claim 1, wherein: The current detection ring includes a recess, and the current sensor is located in the recess.

4. The current detection device according to claim 3, wherein: The invention also comprises a fixing colloid filled into the recess to fix the current sensor, wherein the electrode pins of the current sensor are exposed outside the fixing colloid.

5. The current detection device according to claim 1, wherein: The invention also comprises a shell, wherein the shell comprises a groove, and the groove accommodates the first circuit board, the second circuit board, the current detection ring, the current sensor and the conductive column.

6. The current detection device according to claim 5, wherein: The invention also comprises a waterproof heat dissipation colloid, which is located in the groove and covers at least a part of the first circuit board, the second circuit board, the current detection ring and the current sensor.

7. The current detection device according to claim 1, wherein: The integrated injection-molded plastic part comprises a pair of buckle posts, and the first circuit board comprises a pair of buckle holes, and the pair of buckle posts are respectively inserted into the pair of buckle holes.

8. The current detection device according to claim 7, wherein: The integrated injection-molded plastic part comprises a recess, and the current sensor is located in the recess; the recess and the pair of buckle columns are located on the same surface of the integrated injection-molded plastic part.

9. The current detection device according to claim 1, wherein: It also includes a stud, two ends of which are respectively fixed to the first circuit board and the second circuit board.

10. The current detection device according to claim 1, wherein: The device also comprises a waterproof heat dissipation colloid, which covers at least a part of the first circuit board, the second circuit board, the current detection ring and the current sensor.

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