CN111413535B

CN111413535B - Current measuring device and current measuring assembly

Info

Publication number: CN111413535B
Application number: CN202010248848.1A
Authority: CN
Inventors: 陈跃俊; 贾超峰
Original assignee: Huafeng Test & Control Technology Tianjin Co ltd; Beijing Huafeng Test & Control Technology Co ltd
Current assignee: Huafeng Test & Control Technology Tianjin Co ltd; Beijing Huafeng Test & Control Technology Co ltd
Priority date: 2020-04-01
Filing date: 2020-04-01
Publication date: 2025-03-18
Anticipated expiration: 2040-04-01
Also published as: CN111413535A

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, thereby improving the safety performance.

Description

Current measuring device and current measuring assembly

Technical Field

The invention relates to the technical field of measurement, in particular to a current measurement device.

Background

In the prior art, current parameters are often measured when testing high power integrated circuits. There are many methods for obtaining current, and it is a relatively effective means to obtain a current value by using the principle of electromagnetic induction by making a wire current loop pass through a current transformer. However, in the prior art, the dynamic response of the test is greatly affected by the way of measuring the current through the current transformer.

Disclosure of Invention

Based on this, it is necessary to provide a current measuring device and a current measuring assembly for solving the problem that the dynamic response of the test is greatly affected by the current transformer measuring the current.

A current measurement device, comprising:

A conductive housing surrounding a first receiving space, the conductive housing including oppositely disposed openings and a bottom;

a conductive post disposed in the first accommodation space, the conductive post extending from the bottom toward the opening, the conductive post being electrically connected to the bottom, and

The current transformer is arranged in the first accommodating space, the current transformer is arranged with the conductive shell in an insulating way, and the conductive column penetrates through the current transformer.

In one embodiment, the open edge is provided with a conductive rim.

In one embodiment, the conductive housing is provided with a current outlet spaced from the conductive rim.

In one embodiment, the current outlet is provided at an edge of the opening.

In one embodiment, the open profile has an arcuate region and a linear region, the linear region being connected end-to-end with the arcuate region, the conductive rim being disposed about the arcuate region, the current outlet being disposed in the linear region.

In one embodiment, the conductive edge is provided with a plurality of fixing holes at intervals.

In one embodiment, the conductive housing has an axis of symmetry, and the axis of the conductive post coincides with the axis of symmetry.

In one embodiment, the current transformer further comprises an insulating cover, the insulating cover is arranged in the first accommodating space, the insulating cover surrounds to form a second accommodating space, and the current transformer is arranged in the second accommodating space.

In one embodiment, the insulating cover comprises a first cover body and a second cover body, the first cover body and the second cover body are respectively provided with an opening, and the openings of the first cover body and the second cover body are buckled relatively to form the second accommodating space.

A current measurement assembly comprising:

the current measuring device is used for measuring the current;

the circuit board, the circuit board is provided with conductive pin, conductive shell has openly, conductive shell lock in when the circuit board, open edge laminating in the circuit board, the conductive post with conductive pin electricity is connected.

In one embodiment, the circuit board is provided with a conductive area, the shape of the conductive area is matched with that of the opening, and when the conductive shell is buckled on the circuit board, the opening is in contact with the circuit board in the conductive area.

According to the current measuring device and the current measuring assembly provided by the embodiment of the application, when the current flowing through certain circuits on the circuit board is required to be measured or the current of certain components on the circuit board is required to be measured, the opening of the conductive shell can be buckled on the surface of the circuit board, and the conductive shell is in electrical contact with the circuit board. I.e. the circuit or component to be measured for the current is connected to the conductive housing via the circuit board. And (3) energizing a circuit or a component needing to measure the current to generate the current, wherein the current flows to the conductive column through the conductive shell and then flows out through the conductive column to form a loop. The current flows from the edge of the opening to the bottom, and the conductive column is electrically connected with the bottom and extends towards the direction of the opening, so that the current flows towards the direction of the opening along the extending direction of the conductive column. The current flows in the conductive housing in a direction opposite to the direction of flow in the conductive posts. Therefore, parasitic parameters such as parasitic inductance and the like can be eliminated, and the influence on the test dynamic response is avoided. Further, as the cross-sectional area of the conductive shell is larger than that of the conductive wire, the contact area of the opening and the circuit board is also larger, so that the resistance of the current is smaller, heat release can be reduced, and the safety performance is improved.

Drawings

FIG. 1 is an exploded view of a current measuring device according to one embodiment of the present application;

FIG. 2 is a cross-sectional view of a current measurement device according to one embodiment of the present application;

FIG. 3 is a bottom view of a conductive housing provided in accordance with one embodiment of the present application;

FIG. 4 is an exploded view of a current measurement assembly according to one embodiment of the present application;

Fig. 5 is a cross-sectional view of a current measurement assembly provided in one embodiment of the application.

Reference numerals illustrate:

Current measuring device 10

Conductive housing 100

First accommodation space 110

Opening 112

Bottom 113

Conductive rim 114

Fixing hole 116

Current outlet 118

Arcuate region 122

Straight line area 124

Conductive post 130

Current transformer 200

Insulating cover 300

The second accommodation space 310

First cover 312

Second housing 314

Opening 316

Circuit board 400

Conductive pin 410

Conductive region 420

Opening 430

Plug connector 440

Current measurement assembly 20

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected through an intervening medium, or in communication between two elements or in an interaction relationship between two elements, unless otherwise explicitly specified. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Referring to fig. 1 and 2, an embodiment of the present application provides a current measurement apparatus 10. The current measurement device 10 includes a conductive housing 100, a conductive post 130, and a current transformer 200. The conductive housing 100 encloses a first receiving space 110. The conductive housing 100 includes an oppositely disposed opening 112 and a bottom 113. The conductive column 130 is disposed in the first accommodating space 110. The conductive post 130 is electrically connected to the bottom 113. The conductive posts 130 extend from the bottom 113 toward the opening 112. I.e. the conductive posts 130 may extend along the axial direction of the conductive housing 100. The current transformer 200 is disposed in the first accommodating space 110. The current transformer 200 is arranged in an insulated manner with the conductive housing 100. The conductive post 130 passes through the current transformer 200.

The conductive housing 100 may be made of a metal material. The metal material can be copper, aluminum, iron and other materials. The conductive housing 100 is provided with opposing openings 112 and bottoms 113. The conductive housing 100 may be a tub-like structure having the opening 112 and the bottom 113. The first receiving space 110 may also have a cylindrical or cubic structure. The shape of the first receiving space 110 may be matched with the current transformer 200. The material of the conductive pillars 130 may be metal.

The conductive posts 130 may also be made of copper, aluminum, iron, etc. The conductive post 130 may be circular or rectangular in cross-section. One end of the conductive post 130 may be connected to the conductive housing 100. In one embodiment, the conductive posts 130 may be connected to the bottom 113 of the conductive housing 100. In one embodiment, the conductive posts 130 may be integrally formed with the conductive housing 100. The conductive posts 130 extend along the axial direction of the conductive housing 100, i.e., the conductive posts 130 may be parallel with respect to the axis of the conductive housing 100. When the conductive housing 100 is in a barrel structure, the axis of the conductive housing 100 is the axis of the barrel structure. The length of the conductive housing 100 extends along the axis.

The current transformer 200 can convert primary side large current into secondary side small current for measurement according to the electromagnetic induction principle. The current transformer 200 may be comprised of a closed core and windings. The current transformer 200 may be a feedthrough. I.e. the middle part of the current transformer 200 may have a through hole. The conductive post 130 may pass through the via. When current flows through the conductive post 130, the current signal can be output through the plug connector 440 of the current transformer 200 by electromagnetic induction. The magnitude of the current through the conductive pillars 130 can be obtained from the current signal.

When it is required to measure the current flowing through some circuits on the circuit board 400 or measure the current flowing through some components on the circuit board 400, the opening 112 of the conductive housing 100 may be fastened to the surface of the circuit board 400, and the conductive housing 100 is electrically contacted with the circuit board 400. I.e. the circuit or component that needs to measure the current is connected to the conductive housing 100 through the circuit board 400. Energizing the circuit or component requiring current measurement creates a current that flows through the conductive housing 100 to the conductive post 130 and then out through the conductive post 130 to form a loop. The current flows from the edge of the opening 112 to the bottom 113, and the conductive pillar 130 is electrically connected to the bottom 113, and the conductive pillar 130 extends toward the opening 112, so that the current flows along the extending direction of the conductive pillar 130 toward the opening 112. The current flows in the conductive housing 100 in the opposite direction to the conductive post 130. Therefore, parasitic parameters such as parasitic inductance and the like can be eliminated, and the influence on the test dynamic response is avoided. Further, since the cross-sectional area of the conductive housing 100 is larger than that of the conductive wires, the contact area between the opening 112 and the circuit board 400 is also larger, so that the resistance of the current is smaller, the heat release can be reduced, and the safety performance can be improved.

Referring to fig. 3, in one embodiment, the edge of the opening 112 is provided with a conductive rim 114. The conductive rim 114 may be a conductive sheet extending from the opening 112 in a direction away from the first receiving space 110. The width of the conductive rim 114 may be the same. The conductive rim 114 may have the same contour as the opening 112. The conductive rim 114 may be integrally formed with the conductive housing 100. When the opening 112 of the conductive housing 100 is fastened to the surface of the circuit board 400, the surface of the conductive edge 114 may be completely adhered to the surface of the circuit board 400, so that the stability of current conduction may be improved. The surface of the conductive edge 114 is attached to the surface of the circuit board 400 to increase the area through which current flows, and thus reduce the resistance in the circuit through which current flows.

In one embodiment, the conductive housing 100 is provided with a current outlet 118. The current outlet 118 is spaced from the conductive rim 114. When current flows to the end of the conductive post 130 adjacent to the opening 112, it may flow through the current outlet 118 via a wire or circuit board 400. It is understood that the current outlet 118 may be located anywhere on the conductive housing 100. The current outlet 118 is insulated from the conductive rim 114, so that short circuits are avoided. The shape of the circuit output port can be round, square or diamond.

In one embodiment, the current outlet 118 is disposed at an edge of the opening 112. I.e. the current outlet 118 may be a notch formed in the side of the opening 112. The circuit board 400 may be wired with copper wires that pass right through the current outlet 118 when the conductive housing 100 is snapped onto the circuit board 400. At this time, an end of the conductive post 130 near the opening 112 may be connected to the copper wire. Thus, the current passing through the conductive housing 100 flows out through the conductive post 130, the copper wire. The current outlet 118 is provided at the edge of the opening 112 for easy manufacture and simple structure.

In one embodiment, the arcuate region 122 and the linear region 124. The linear region 124 is joined end-to-end with the arcuate region 122, thus forming a closed loop, forming the opening 112. The conductive rim 114 is disposed around the arcuate region 122. The current outlet 118 is disposed in the linear region 124. The arcuate region 122 may be a semicircular profile or any profile having an arc. The arcuate region 122 may also be U-shaped. The two ends of the straight line area 124 are respectively connected with two ends of the U-shaped opening 316 to form the opening 112. The current output port 118 is disposed in the linear region 124, so as to facilitate identifying the position of the current output port 118.

In one embodiment, the conductive rim 114 is provided with a plurality of fixing holes 116 at intervals. The shape of the fixing hole 116 is not limited, and may be square or circular. The plurality of fixing holes 116 may be disposed at equal intervals. The conductive housing 100 may be then fixed to the circuit board 400 by passing a screw bolt through the fixing hole 116. It will be appreciated that the circuit board 400 may also be provided with openings 430 corresponding to the securing holes 116 to facilitate the passage of bolts or screws to secure the conductive housing 100. The fixing hole 116 may be a threaded hole, that is, the conductive housing 100 may be fixed to the circuit board 400 by a threaded engagement.

In one embodiment, the conductive housing 100 has an axis of symmetry. The axis of the conductive post 130 coincides with the symmetry axis. The conductive housing 100 is thus an axisymmetric structure. In one embodiment, the conductive housing 100 may be a mirror-symmetrical structure. The conductive posts 130 are disposed on a symmetry plane of the conductive housing 100. It can be appreciated that when the conductive housing 100 has a symmetrical structure, the parasitic inductance of the current flowing through the conductive housing 100 and the current flowing through the conductive post 130 can be offset more effectively.

In one embodiment, the conductive posts 130 are equidistant from the inner wall of the conductive housing 100. The distribution density of the current in the conductive housing is the same, so that the canceling effect of the parasitic inductance generated by the current flowing through the conductive housing 100 and the current flowing through the conductive post 130 can be improved.

In one embodiment, the current measurement device 10 further includes an insulating cover 300. The insulating cover 300 is disposed in the first accommodating space 110. The insulating cover 300 encloses a second receiving space 310. The current transformer 200 is disposed in the second accommodating space 310. The insulating cover 300 may be a polyester-based material. In one embodiment, the insulating cover 300 may be high voltage resistant polytetrafluoroethylene. The shape of the insulating cover 300 may be matched to the shape of the current transformer 200. The insulation cover 300 is disposed between the current transformer 200 and the conductive housing 100. The insulation cover 300 may thus function 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 be closely adhered to each other, so that the volume of the current measuring apparatus 10 may be reduced.

In one embodiment, the insulating cover 300 includes a first cover 312 and a second cover 314. The first housing 312 and the second housing 314 each have an opening 316. The opening 316 of the first cover 312 and the opening 316 of the second cover 314 are fastened together to form the second accommodating space 310.

The first housing 312 and the second housing 314 may be identical in shape. The opening 316 of the first housing 312 and the opening 316 of the second housing 314 may be different sizes. When the opening 316 of the first cover 312 and the opening 316 of the second cover 314 are fastened together, the opening 316 of the first cover 312 and the opening 316 of the second cover 314 may be a clearance fit. In one embodiment, the opening 316 of the first housing 312 and the opening 316 of the second housing 314 may be engaged with each other. The circuit transformer is prevented from falling out of the second accommodation space 310.

Referring to fig. 4 and 5, an 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 conductive pins 410. The conductive housing 100 has an opening 112. When the conductive housing 100 is fastened to the circuit board 400, the edge of the opening 112 is attached to the circuit board 400, and the conductive post 130 is electrically connected to the conductive pin 410.

It is understood that the circuit board 400 may be a PCB board or a busbar. The circuit board 400 may be provided with a circuit or a component that requires a current to be measured. When the housing is fastened to the surface of the circuit board 400, the opening 112 contacts with the circuit board 400. After the circuit board 400 is energized, current flows through the circuit or the component to the conductive housing 100. When current flows to the bottom 113 of the conductive housing 100, it flows through the conductive posts 130 toward the opening 112. The conductive post 130 may be electrically connected to the circuit board 400 through the conductive pin 410, so that current may flow through the circuit board 400 to form a loop. Since the current flows in opposite directions in the current housing and the conductive post 130, the influence of parasitic inductance can be eliminated.

The conductive post 130 may have an internally threaded bore and the conductive pin 410 may have external threads. The conductive pin 410 may be inserted into the internally threaded hole to electrically connect with the conductive post 130.

In one embodiment, the circuit board 400 is provided with conductive areas 420. The shape of the conductive region 420 matches the shape of the opening 112. When the conductive housing 100 is fastened to the circuit board 400, the opening 112 contacts the circuit board 400 at the conductive area 420.

The edges of the opening 112 are provided with conductive edges 114 so that the shape of the conductive areas 420 can match the shape of the conductive edges 114. Further, the area of the conductive region 420 may be greater than the area of the conductive rim 114. I.e. the projection of the conductive rim 114 onto the circuit board 400 falls into the conductive area 420, the effect of conduction can be ensured.

In one embodiment, the conductive region 420 may have a U-shape. The conductive rim 114 is also U-shaped in shape.

In one embodiment, the conductive region 420 may be provided with a plurality of openings 430 at intervals. The openings 430 may be in one-to-one correspondence with the securing holes 116 of the conductive rim 114. The hole 430 and the fixing hole 116 may be coupled and fixed by a bolt or a screw. The openings 430 may also be blind holes. After the fixing hole 116 and the opening 430 are aligned, the fixing hole 116 and the opening 430 may be relatively fixed by a bolt or a screw.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. A current measuring device, comprising:

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) disposed in the first accommodation space (110), the conductive column (130) extending from the bottom (113) toward the opening (112), the conductive column (130) being electrically connected to the bottom (113); and

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 a conductive edge (114) is provided at the edge of the opening (112).

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 is characterized in that the contour of the opening (112) has an arc region (122) and a straight region (124), the straight region (124) is connected end to end with the arc region (122), the conductive edge (114) is arranged around the arc region (122), and the current output port (118) is arranged in the straight region (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 is 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), and 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 measurement component, comprising:

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).