Current measuring device and current measuring assembly

Abstract

The present application relates to a current measuring device and a current measuring assembly. When it is necessary to measure the magnitude of the current flowing through certain circuits on a circuit board, the opening of the conductive housing can be snapped onto the surface of the circuit board, and the conductive housing is in electrical contact with the circuit board. When the circuit or component that needs to measure the current is energized to generate current, the current will flow to the conductive column through the conductive housing, and then flow out through the conductive column to form a loop. The current first flows from the edge of the opening to the bottom. Since the conductive column is electrically connected to the bottom and the conductive column extends toward the direction of the opening, the current flows along the extension direction of the conductive column toward the direction where the opening is located. The flow direction of the current in the conductive housing is opposite to the flow direction in the conductive column. Therefore, parasitic parameters such as parasitic inductance can be eliminated to avoid the influence on the dynamic response of the test. Since the cross-sectional area of ​​the conductive housing is larger than that of the wire, the resistance to the current is smaller, which improves the safety performance.

Description

Technical Field

[0001] The present invention relates to the field of measurement technology, in particular to a current measuring device. Background Art

[0002] In the prior art, when testing high-power integrated circuits, it is usually necessary to measure current parameters. There are many ways to obtain current. By making the wire current loop pass through a current transformer and using the principle of electromagnetic induction to obtain the current value is a relatively effective means. However, in the prior art, the method of measuring the current size through a current transformer will have a great impact on the dynamic response of the test. Summary of the invention

[0003] Based on this, it is necessary to provide a current measuring device and a current measuring component to address the problem in the prior art that the way of measuring current magnitude by a current transformer has a significant impact on the dynamic response of the test.

[0004] A current measuring device, comprising:

[0005] A conductive shell, enclosing and forming a first accommodation space, the conductive shell comprising an opening and a bottom that are oppositely arranged;

[0006] a conductive column, disposed in the first accommodation space, the conductive column extending from the bottom toward the opening, the conductive column being electrically connected to the bottom; and

[0007] A current transformer is arranged in the first accommodating space, the current transformer and the conductive shell are insulated, and the conductive column passes through the current transformer.

[0008] In one of the embodiments, the edge of the opening is provided with a conductive edge.

[0009] In one of the embodiments, the conductive shell is provided with a current output port, and the current output port is spaced apart from the conductive edge.

[0010] In one embodiment, the current output port is disposed at an edge of the opening.

[0011] In one embodiment, the contour of the opening has an arc region and a straight region, the straight region is connected end to end with the arc region, the conductive edge is arranged around the arc region, and the current output port is arranged in the straight region.

[0012] In one of the embodiments, the conductive edge is provided with a plurality of fixing holes at intervals.

[0013] In one embodiment, the conductive housing has a symmetry axis, and the axis of the conductive column coincides with the symmetry axis.

[0014] In one embodiment, it further includes an insulating cover, which is arranged in the first accommodation space. The insulating cover surrounds and forms a second accommodation space, and the current transformer is arranged in the second accommodation space.

[0015] In one embodiment, the insulating cover includes a first cover body and a second cover body, the first cover body and the second cover body respectively have an opening, and the opening of the first cover body and the opening of the second cover body are relatively buckled to form the second accommodating space.

[0016] A current measurement component, comprising:

[0017] The current measuring device;

[0018] A circuit board is provided with a conductive pin, the conductive housing has an opening, when the conductive housing is buckled on the circuit board, the edge of the opening is attached to the circuit board, and the conductive column is electrically connected to the conductive pin.

[0019] In one embodiment, the circuit board is provided with a conductive area, the shape of the conductive area matches the shape of the opening, and when the conductive housing is buckled onto the circuit board, the opening contacts the circuit board at the conductive area.

[0020] The current measuring device and current measuring assembly provided in the embodiment of the present application can be buckled on the surface of the circuit board when it is necessary to measure the current flowing through certain circuits on the circuit board or to measure the current of certain components on the circuit board, and the conductive housing can be electrically contacted with the circuit board. That is, the circuit or component that needs to measure the current is connected to the conductive housing through the circuit board. When the circuit or component that needs to measure the current is energized to generate current, the current will flow to the conductive column through the conductive housing, and then flow out through the conductive column to form a loop. The current first flows from the edge of the opening to the bottom. Since the conductive column is electrically connected to the bottom and the conductive column extends toward the direction of the opening, the current flows along the extension direction of the conductive column toward the direction where the opening is located. The flow direction of the current in the conductive housing is opposite to the flow direction of the conductive column. Therefore, parasitic parameters such as parasitic inductance can be eliminated to avoid the impact on the dynamic response of the test. Furthermore, since the cross-sectional area of ​​the conductive shell is larger than that of the wire, the contact area between the opening and the circuit board is also larger, so the resistance encountered by the current is smaller, heat release can be reduced, and safety performance is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 An exploded diagram of a current measuring device provided in one embodiment of the present application;

[0022] Figure 2 A cross-sectional view of a current measuring device provided in one embodiment of the present application;

[0023] Figure 3 A bottom view of a conductive housing provided in accordance with an embodiment of the present application;

[0024] Figure 4 An exploded view of a current measurement assembly provided in accordance with an embodiment of the present application;

[0025] Figure 5 A cross-sectional view of a current measurement assembly provided according to an embodiment of the present application.

[0026] Description of reference numerals:

[0027] Current measuring device 10

[0028] Conductive housing 100

[0029] The first storage space 110

[0030] Open 112

[0031] Bottom 113

[0032] Conductive edge 114

[0033] Fixing hole 116

[0034] Current output port 118

[0035] Arc area 122

[0036] Straight line area 124

[0037] Conductive column 130

[0038] Current transformer 200

[0039] Insulation cover 300

[0040] The second storage space 310

[0041] First cover 312

[0042] Second cover 314

[0043] Opening 316

[0044] Circuit board 400

[0045] Conductive pin 410

[0046] Conductive area 420

[0047] Opening 430

[0048] Connector 440

[0049] Current measurement component 20 DETAILED DESCRIPTION

[0050] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0051] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0052] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0055] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0056] See also Figure 1 and Figure 2 , an embodiment of the present application provides a current measuring device 10. The current measuring device 10 includes a conductive housing 100, a conductive column 130 and a current transformer 200. The conductive housing 100 surrounds a first accommodation space 110. The conductive housing 100 includes an opening 112 and a bottom 113 that are arranged opposite to each other. The conductive column 130 is arranged in the first accommodation space 110. The conductive column 130 is electrically connected to the bottom 113. The conductive column 130 extends from the bottom 113 toward the opening 112. That is, the conductive column 130 can extend along the axial direction of the conductive housing 100. The current transformer 200 is arranged in the first accommodation space 110. The current transformer 200 is insulated from the conductive housing 100. The conductive column 130 passes through the current transformer 200.

[0057] The conductive housing 100 may be made of a metal material. The metal material may be copper, aluminum, iron or the like. The conductive housing 100 is provided with a relative opening 112 and a bottom 113. The conductive housing 100 may be a barrel-shaped structure having the opening 112 and the bottom 113. The first accommodation space 110 may also be a cylindrical or cubic structure. The shape of the first accommodation space 110 may match the current transformer 200. The material of the conductive column 130 may be metal.

[0058] The conductive column 130 may also be made of copper, aluminum, iron and other materials. The cross-section of the conductive column 130 may be circular or rectangular. One end of the conductive column 130 may be connected to the conductive housing 100. In one embodiment, the conductive column 130 may be connected to the bottom 113 of the conductive housing 100. In one embodiment, the conductive column 130 may be integrally formed with the conductive housing 100. The conductive column 130 extends along the axis direction of the conductive housing 100, that is, the conductive column 130 may be parallel to the axis of the conductive housing 100. When the conductive housing 100 is a barrel-shaped structure, the axis of the conductive housing 100 is the axis of the barrel-shaped structure. The length of the conductive housing 100 extends along the axis.

[0059] The current transformer 200 can convert a large current on the primary side into a small current on the secondary side for measurement based on the principle of electromagnetic induction. The current transformer 200 can be composed of a closed iron core and a winding. The current transformer 200 can be a through-type. That is, a through hole can be provided in the middle of the current transformer 200. The conductive column 130 can pass through the through hole. When current passes through the conductive column 130, the current signal can be output through the connector 440 on the current transformer 200 through electromagnetic induction. The magnitude of the current passing through the conductive column 130 can be obtained through the current signal.

[0060] When it is necessary to measure the magnitude of the current flowing through certain circuits on the circuit board 400 or to measure the magnitude of the current of certain components on the circuit board 400, the opening 112 of the conductive housing 100 can be buckled on the surface of the circuit board 400, and the conductive housing 100 is in electrical contact with the circuit board 400. That is, the circuit or component that needs to measure the current is connected to the conductive housing 100 through the circuit board 400. When the circuit or component that needs to measure the current is energized to generate current, the current will flow through the conductive housing 100 to the conductive column 130, and then flow out through the conductive column 130 to form a loop. The current first flows from the edge of the opening 112 to the bottom 113. Since the conductive column 130 is electrically connected to the bottom 113 and the conductive column 130 extends toward the direction of the opening 112, the current flows along the extension direction of the conductive column 130 toward the direction where the opening 112 is located. The flow direction of the current in the conductive housing 100 is opposite to the flow direction in the conductive column 130. Therefore, parasitic parameters such as parasitic inductance can be eliminated to avoid affecting the dynamic response of the test. Furthermore, since the cross-sectional area of ​​the conductive housing 100 is larger than the cross-sectional area of ​​the wire, the contact area between the opening 112 and the circuit board 400 is also larger, so the resistance of the current is smaller, heat release can be reduced, and safety performance can be improved.

[0061] See also Figure 3 In one embodiment, a conductive edge 114 is provided at the edge of the opening 112. The conductive edge 114 may be a conductive sheet extending from the opening 112 in a direction away from the first accommodation space 110. The widths of the conductive edges 114 may be the same. The contour of the conductive edge 114 may be the same as the contour of the opening 112. The conductive edge 114 may be integrally formed with the conductive housing 100. When the opening 112 of the conductive housing 100 is snapped onto the surface of the circuit board 400, the surface of the conductive edge 114 may be completely in contact with the surface of the circuit board 400, thereby improving the stability of current conduction. The surface of the conductive edge 114 is in contact with the surface of the circuit board 400, and at the same time, the area through which the current flows is increased, which may reduce the resistance in the circuit through which the current flows.

[0062] In one embodiment, the conductive housing 100 is provided with a current outlet 118. The current outlet 118 is spaced apart from the conductive edge 114. When the current flows to the end of the conductive column 130 close to the opening 112, it can flow out through the current outlet 118 via the wire or the circuit board 400. It can be understood that the current outlet 118 can be provided at any position of the conductive housing 100. The current outlet 118 should be insulated from the conductive edge 114, so as to avoid short circuit. The shape of the circuit outlet can be circular, square, diamond or other shapes.

[0063] In one embodiment, the current output port 118 is disposed at the edge of the opening 112. That is, the current output port 118 can be a notch opened at the edge of the opening 112. The circuit board 400 can be laid with a copper wire, and when the conductive housing 100 is buckled on the circuit board 400, the copper wire can just pass through the current output port 118. At this time, one end of the conductive column 130 close to the opening 112 can be connected to the copper wire. Therefore, the current passing through the conductive housing 100 flows out through the conductive column 130 and the copper wire. The current output port 118 is disposed at the edge of the opening 112, which is easy to manufacture and has a simple structure.

[0064] In one embodiment, the arc region 122 and the straight region 124. The straight region 124 is connected end to end with the arc region 122, thereby forming a closed loop to form the opening 112. The conductive edge 114 is arranged around the arc region 122. The current output port 118 is arranged in the straight region 124. The arc region 122 can be a semicircular outline or any outline with an arc line. The arc region 122 can also be U-shaped. The two ends of the straight region 124 are respectively connected to the two ends of the U-shaped opening 316 to form the opening 112. The current output port 118 is arranged in the straight region 124 to facilitate identification of the position of the current output port 118.

[0065] In one embodiment, the conductive edge 114 is provided with a plurality of fixing holes 116 at intervals. The shape of the fixing holes 116 is not limited, and may be square or circular. The plurality of fixing holes 116 may be provided at equal intervals. Screws and bolts may be passed through the fixing holes 116, and then the conductive housing 100 may be fixed to the circuit board 400. It is understood that the circuit board 400 may also be provided with openings 430 corresponding to the fixing holes 116, so as to facilitate passing bolts or screws to fix the conductive housing 100. The fixing holes 116 may also be threaded holes, that is, the conductive housing 100 may be fixed to the circuit board 400 by threaded engagement.

[0066] In one embodiment, the conductive housing 100 has an axis of symmetry. The axis of the conductive column 130 coincides with the axis of symmetry. Therefore, the conductive housing 100 is an axisymmetric structure. In one embodiment, the conductive housing 100 may be a mirror-symmetrical structure. The conductive column 130 is disposed on a symmetric plane of the conductive housing 100. It can be understood that when the conductive housing 100 is a symmetrical structure, the parasitic inductance of the current flowing through the conductive housing 100 and the current flowing through the conductive column 130 can be offset better.

[0067] In one embodiment, the distances between the conductive pillars 130 and the inner wall of the conductive housing 100 are equal. The current distribution density in the conductive housing is the same, so the parasitic inductance generated by the current flowing through the conductive housing 100 and the current flowing through the conductive pillars 130 can be offset.

[0068] In one embodiment, the current measuring device 10 further includes an insulating cover 300. The insulating cover 300 is disposed in the first accommodation space 110. The insulating cover 300 surrounds and forms a second accommodation space 310. The current transformer 200 is disposed in the second accommodation space 310. The insulating cover 300 may be a polyester material. In one embodiment, the insulating cover 300 may be a high-voltage resistant polytetrafluoroethylene. The shape of the insulating cover 300 may match the shape of the current transformer 200. The insulating cover 300 is disposed between the current transformer 200 and the conductive housing 100. Therefore, the insulating cover 300 may serve to insulate the current transformer 200 from the conductive housing 100. In one embodiment, the conductive housing 100, the insulating cover 300 and the current transformer 200 may fit closely together, thereby reducing the volume of the current measuring device 10.

[0069] In one embodiment, the insulating cover 300 includes a first cover body 312 and a second cover body 314. The first cover body 312 and the second cover body 314 respectively have an opening 316. The opening 316 of the first cover body 312 and the opening 316 of the second cover body 314 are relatively buckled to form the second accommodation space 310.

[0070] The shapes of the first cover body 312 and the second cover body 314 may be the same. The sizes of the opening 316 of the first cover body 312 and the opening 316 of the second cover body 314 may be different. When the opening 316 of the first cover body 312 and the opening 316 of the second cover body 314 are relatively buckled, the opening 316 of the first cover body 312 and the opening 316 of the second cover body 314 may be a clearance fit. In one embodiment, the opening 316 of the first cover body 312 and the opening 316 of the second cover body 314 may bite each other. Prevent the circuit transformer from falling off from the second accommodating space 310.

[0071] See also Figure 4 and Figure 5 The embodiment of the present application further provides a current measurement assembly 20. The current measurement assembly 20 includes the current measurement device 10 and a circuit board 400. The circuit board 400 is provided with a conductive pin 410. The conductive housing 100 has an opening 112. When the conductive housing 100 is buckled on the circuit board 400, the edge of the opening 112 is attached to the circuit board 400, and the conductive column 130 is electrically connected to the conductive pin 410.

[0072] It can be understood that the circuit board 400 can be a PCB board or a busbar. The circuit board 400 can be provided with a circuit or component that needs to be measured. When the housing is buckled on the surface of the circuit board 400, the opening 112 is in contact with the circuit board 400. After the circuit board 400 is powered on, the current flows through the circuit or the component to the conductive housing 100. After the current flows to the bottom 113 of the conductive housing 100, it flows toward the opening 112 through the conductive column 130. The conductive column 130 can be electrically connected to the circuit board 400 through the conductive pin 410, so that the current can form a loop through the circuit board 400. Since the flow directions of the current in the current housing and the conductive column 130 are opposite, the influence of parasitic inductance can be eliminated.

[0073] The conductive column 130 may have an internal thread hole, and the conductive pin 410 may have an external thread. The conductive pin 410 may be inserted into the internal thread hole to be electrically connected to the conductive column 130 .

[0074] In one embodiment, the circuit board 400 is provided with a conductive area 420. The shape of the conductive area 420 matches the shape of the opening 112. When the conductive housing 100 is buckled onto the circuit board 400, the opening 112 contacts the circuit board 400 at the conductive area 420.

[0075] The edge of the opening 112 is provided with a conductive edge 114, so the shape of the conductive area 420 can match the shape of the conductive edge 114. Further, the area of ​​the conductive area 420 can be larger than the area of ​​the conductive edge 114. That is, the projection of the conductive edge 114 on the circuit board 400 falls into the conductive area 420, so the conductive effect can be guaranteed.

[0076] In one embodiment, the conductive area 420 may be in a U-shape. The conductive edge 114 may also be in a U-shape.

[0077] In one embodiment, the conductive area 420 may be provided with a plurality of openings 430 at intervals. The openings 430 may correspond to the fixing holes 116 of the conductive edge 114 one by one. That is, the openings 430 and the fixing holes 116 may be connected and fixed by bolts or screws. The openings 430 may also be blind holes. When the fixing holes 116 and the openings 430 are aligned, the fixing holes 116 and the openings 430 may be fixed relative to each other by bolts or screws.

[0078] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A current measuring device, characterized in that: include: A conductive housing (100) encloses and forms a first accommodation space (110), wherein the conductive housing (100) comprises an opening (112) and a bottom (113) that are arranged opposite to each other; A conductive column (130) is disposed in the first accommodation space (110), the conductive column (130) extends from the bottom (113) toward the opening (112), and the conductive column (130) is electrically connected to the bottom (113); as well as A current transformer (200) is arranged in the first accommodating space (110); the current transformer (200) is insulated from the conductive shell (100); the conductive column (130) passes through the current transformer (200); the current flows from the edge of the opening (112) to the bottom (113), and flows along the extension direction of the conductive column (130) toward the direction where the opening (112) is located; the flow direction of the current in the conductive shell (100) is opposite to the flow direction of the current in the conductive column (130).

2. The current measuring device according to claim 1, characterized in that The edge of the opening (112) is provided with a conductive edge (114).

3. The current measuring device according to claim 2, characterized in that: The conductive housing (100) is provided with a current output port (118), and the current output port (118) is spaced apart from the conductive edge (114).

4. The current measuring device according to claim 3, characterized in that: The current output port (118) is arranged at the edge of the opening (112).

5. The current measuring device according to claim 4, characterized in that: The profile of the opening (112) comprises an arc-shaped area (122) and a straight area (124), the straight area (124) being connected end to end with the arc-shaped area (122), the conductive edge (114) being arranged around the arc-shaped area (122), and the current output port (118) being arranged in the straight area (124).

6. The current measuring device according to claim 2, characterized in that: The conductive edge (114) is provided with a plurality of fixing holes (116) at intervals.

7. The current measuring device according to any one of claims 1 to 6, characterized in that: The conductive housing (100) has a symmetry axis, and the axis of the conductive column (130) coincides with the symmetry axis.

8. The current measuring device according to claim 7, characterized in that: It also includes an insulating cover (300), wherein the insulating cover (300) is arranged in the first accommodating space (110), the insulating cover (300) surrounds and forms a second accommodating space (310), and the current transformer (200) is arranged in the second accommodating space (310).

9. The current measuring device according to claim 8, characterized in that: The insulating cover (300) comprises a first cover body (312) and a second cover body (314); the first cover body (312) and the second cover body (314) respectively have an opening (316); the opening (316) of the first cover body (312) and the opening (316) of the second cover body (314) are relatively buckled to form the second accommodating space (310).

10. A current measuring component, characterized in that: include: The current measuring device according to any one of claims 1 to 9; A circuit board (400), wherein the circuit board (400) is provided with a conductive pin (410), the conductive housing (100) has an opening (112), when the conductive housing (100) is buckled onto the circuit board (400), the edge of the opening (112) is attached to the circuit board (400), and the conductive column (130) is electrically connected to the conductive pin (410).

11. The current measuring assembly according to claim 10, characterized in that The circuit board (400) is provided with a conductive area (420), the shape of the conductive area (420) matches the shape of the opening (112), and when the conductive housing (100) is buckled onto the circuit board (400), the opening (112) contacts the circuit board (400) at the conductive area (420).

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