CN216526008U - High stability hall current sensor - Google Patents

Abstract

The application relates to a high-stability Hall current sensor, which relates to the field of measuring instruments and comprises a mounting box provided with a PCB (printed Circuit Board) and a Hall element and an annular magnetic core with a notch; the mounting box is arranged at the notch of the annular magnetic core and provided with two opposite horizontal planes, at least two clamping pieces used for fixing a cable to be tested are arranged on one horizontal plane, and the at least two clamping pieces are connected with the mounting box in a sliding mode. The clamping piece can fix a cable to be measured, at least two clamping pieces can slide on the mounting box, when the cable to be measured is clamped into all the clamping pieces, a worker moves each clamping piece, so that the part of the cable, which penetrates through the annular magnetic core, can keep the horizontal posture perpendicular to a measuring hole of the Hall current sensor and keep the part of the cable on the shaft of the annular magnetic core, and further the measuring precision of the Hall current sensor is improved.

Description

High stability hall current sensor

Technical Field

The application relates to the field of measuring instruments, in particular to a high-stability Hall current sensor.

Background

The Hall current sensor is a magnetoelectric conversion device and comprises a magnetic core, a Hall element, an amplifying circuit and a secondary side compensation winding. The amplifying circuit is integrated on the PCB, and the Hall element is welded on the PCB.

In the related art, when the hall current sensor is used to measure the current in the current-carrying conductors such as the cable to be measured, the current-carrying conductors such as the cable need to vertically pass through the measuring hole of the hall current sensor, and need to be placed on the axis of the measuring hole, and preferably, the cable to be measured is in clearance fit with the measuring hole.

However, in practice, it is difficult to configure a hall current sensor with measuring holes of various specifications at low cost so as to measure cables of various thicknesses. Therefore, it is common to try to make the cable pass vertically through the measurement hole during measurement. Of course, most cables have several bends when measuring current, so that the measurement result has low accuracy.

SUMMERY OF THE UTILITY MODEL

In order to improve hall current sensor's measurement accuracy, this application provides a high stability hall current sensor.

The application provides a high stability hall current sensor adopts following technical scheme:

a high-stability Hall current sensor comprises a mounting box provided with a PCB and a Hall element and an annular magnetic core with a notch;

the mounting box is placed in the gap of the annular magnetic core, the mounting box is provided with two opposite horizontal planes, at least two clamping pieces used for fixing a cable to be tested are arranged on one horizontal plane, and the at least two clamping pieces are in sliding connection with the mounting box.

Through adopting above-mentioned technical scheme, the cable that awaits measuring can be fixed to the fastener, and two at least fasteners can slide on the mounting box, go into all fasteners when the cable card that awaits measuring, and every fastener is removed to the staff for the part that passes annular magnetic core on the cable can keep horizontal gesture perpendicular to hall current sensor's measuring aperture, and keep on the axle of annular magnetic core, and then improve hall current sensor's measurement accuracy.

Optionally, a slide rail is arranged on a horizontal plane on the mounting box, the clamping piece comprises a sliding part, and the sliding part is matched with the slide rail and is in sliding connection with the slide rail.

Through adopting above-mentioned technical scheme for the staff can be through removing the portion of sliding and then remove the fastener.

Optionally, one surface of the sliding part, which is far away from the sliding rail, is fixedly provided with a limiting part, the limiting part is annular, and a notch is formed in the limiting part along the radial direction of the limiting part.

Through adopting above-mentioned technical scheme, the staff can be with the cable by the spacing portion of breach card income to fixed cable.

Optionally, the limiting part has elasticity.

Through adopting above-mentioned technical scheme, spacing portion has elasticity can be applicable to the cable of fixed more sizes.

Optionally, the two ends of the sliding rail are respectively and fixedly provided with a limiting part.

Through adopting above-mentioned technical scheme, the range of motion of fastener can be injectd to the locating part, avoids the staff to remove the fastener outside the slide rail when removing the fastener.

Optionally, the clip is provided with two.

Optionally, the notches of the two limiting parts are arranged in opposite orientations.

Through adopting above-mentioned technical scheme, when the staff blocked the cable into two spacing portions, two spacing portions can be spacing to the both sides of cable simultaneously, had better fixed effect.

Optionally, the mounting box includes box body and lid, the lid can be dismantled with the box body and be connected and sliding connection.

By adopting the technical scheme, the maintenance, debugging and the like are convenient.

Optionally, the lid and the box body are kept away from one side that the slide rail was kept away from each other to lid and box body extends respectively to have a limiting plate, the fixed baffle that is provided with in side that the mounting box was kept away from to the limiting plate, the baffle perpendicular to the limiting plate, and be located one side at mounting box place.

Through adopting above-mentioned technical scheme, the position of placing of annular magnetic core can be injectd to limiting plate and baffle, can fix annular magnetic core when measuring.

Optionally, a protruding datum line is marked on one side, close to the mounting box, of the limiting plate.

Through adopting above-mentioned technical scheme, the staff of being convenient for places annular magnetic core more accurately.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the clamping pieces can fix a cable to be measured, at least two clamping pieces can slide on the mounting box, when the cable to be measured is clamped into all the clamping pieces, a worker moves each clamping piece, so that the part of the cable, which penetrates through the annular magnetic core, can keep a horizontal posture perpendicular to a measuring hole of the Hall current sensor and on a shaft of the annular magnetic core, and further the measuring accuracy of the Hall current sensor is improved;

2. the notches of the limiting parts of the two clamping pieces are arranged in opposite orientations, so that when a worker clamps the cable into the two limiting parts, the two limiting parts can limit the two sides of the cable at the same time, and a better fixing effect is achieved;

3. the reference line marked on the limiting plate is more convenient for workers to accurately place the annular magnetic core.

Drawings

Fig. 1 is a schematic structural diagram of a high-stability hall current sensor according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a mounting box according to an embodiment of the present application.

Fig. 3 is a partially enlarged view of a portion a in fig. 2.

Fig. 4 is a front view of a high stability hall current sensor according to an embodiment of the present application.

Description of reference numerals: 1. a PCB board; 2. a Hall element; 21. a receiving surface; 3. mounting a box; 31. a box body; 32. a box cover; 4. a fastener; 41. a sliding part; 42. a limiting part; 5. an annular magnetic core; 6. an interface; 7. a limiting plate; 71. a reference line; 8. a baffle plate; 9. a slide rail; 91. a T-shaped groove; 92. and a limiting member.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses high stability hall current sensor. Referring to fig. 1 and 2, the high-stability hall current sensor includes a mounting case 3 mounted with a PCB board 1 and a hall element 2, a card member 4 provided on the mounting case 3, and an annular magnetic core 5 having a notch. Wherein, when measuring the electric current of the cable that awaits measuring, the staff can block the cable card that awaits measuring in fastener 4 to the fixed cable that awaits measuring makes the cable that awaits measuring can keep horizontal gesture and pass hall current sensor along the axis of hall current sensor measuring hole, and then makes hall current sensor measuring result comparatively accurate.

Referring to fig. 2, the mounting case 3 is preferably a rectangular parallelepiped shape in the present application, but may be other shapes having two opposing horizontal surfaces, and may be designed adaptively according to actual needs. The mounting box 3 includes a box body 31 and a box cover 32. The box 31 is used for mounting the PCB 1 welded with the hall element 2. In order to facilitate placement of mounting box 3 in the gap of annular magnetic core 5, the depth of box 31 should not be set too large, preferably 1-2 cm. Two opposite horizontal surfaces of box 31 are two surfaces parallel to the depth direction of box 31, and are respectively used as the bottom surface and the top surface of mounting box 3.

Referring to fig. 1 and 2, it can be appreciated that the hall element 2 is generally thin. For convenience of description, two surfaces in which the area is largest are referred to as the receiving surfaces 21. Generally, it is mainly to apply a magnetic field on the receiving surface 21 so that the hall element 2 outputs a lateral potential difference to further measure the magnitude of the current on the energized cable, so when measuring the current using the hall element 2, it is necessary to place the hall element 2 at the notch of the toroidal core 5 so that the receiving surface 21 faces the cross section of the toroidal core 5. Therefore, the receiving surface 21 needs to be perpendicular to the depth direction of the case body 31 when the hall element 2 is mounted in the mounting case 3, so that the toroidal core 5 can apply a magnetic field to the receiving surface 21 when the mounting case 3 is horizontally placed with one of the horizontal surfaces as a bottom surface.

In the present application, the PCB board 1 for soldering the hall element 2 is preferably L-shaped to fit the hall element 2 to form a rectangle to be installed in the case 31. It should be noted that an input power contact and a signal output contact are also led out from the PCB board 1. An interface 6 is connected to each contact. Correspondingly, a through hole for arranging the interface 6 is also formed on the corresponding position on the box body 31.

Referring to fig. 2, it is considered that the hall element 2 and the PCB board 1 may malfunction during use, for example: the hall element 2 is damaged, and the PCB board 1 is soldered poorly to cause short circuit. For this reason, the box cover 32 is detachably connected to the box body 31, so that a worker can replace or maintain the hall element 2 or the PCB 1 in time when the hall element fails. Further, box cover 32 is perpendicular to the depth direction of box 31, and is connected with box 31 in a sliding manner. Specifically, the box body 31 is provided with a sliding groove, so that the box cover 32 can horizontally move in a direction perpendicular to the bottom surface and the top surface. In the present application, the lid 32 is preferably opened by sliding it from the side defined by the box 31. Since the sliding groove formed on the box 31 belongs to the conventional technical means in the related art, the detailed description thereof is omitted.

For convenience of description, a horizontal plane on which the side of the box cover 32 of the box body 31 can slide out in the embodiment of the present application is defined as a bottom plane, that is, another horizontal plane is defined as a top plane.

Referring to fig. 1 and 2, the box cover 32 and the box body 31 are away from each other on the bottom surfaces of the box cover 32 and the box body 31, and the limiting plates 7 respectively extend in the directions away from each other in sequence, the side edge of the limiting plate 7 away from the installation box 3 is further fixedly provided with a baffle plate 8, and the baffle plate 8 is perpendicular to the limiting plate 7 and is located on one side of the installation box 3 for placing the annular magnetic core 5. Of course, not only the side edge of the limiting plate 7 far away from the mounting box 3, but also the other two side edges of the limiting plate 7 can be fixedly provided with the baffle plates 8. In the embodiment of the present application, only the side edge of the limiting plate 7 away from the mounting box 3 is provided with the baffle 8 for example.

It should be noted that, according to the principle that the receiving surface 21 receives different numbers of magnetic induction lines according to the distance between the hall element 2 and the magnetic field, the mounting box 3 is placed at different positions at the notch of the annular magnetic core 5, which has different influences on the measurement result. That is, the closer the mounting case 3 is to the cross section of the toroidal core 5, the greater the number of magnetic induction lines received by the hall element 2. Of course, the optimal placement position of the mounting case 3 is the center position between the two cross sections of the annular magnetic core 5, so that the distances from the hall element 2 to the two cross sections are equal.

It can be understood that even if the baffle 8 can limit the placement position of the toroidal core 5, the worker cannot place the toroidal core 5 on the position limiting plate 7 with sufficient accuracy when placing the toroidal core 5, so that the distances from the two sections to the mounting box 3 are equal. For this purpose, the limit plate 7 is marked with a projecting reference line 71 on the side close to the mounting box 3. When the worker places the notch of the annular magnetic core 5 to be aligned with the reference line 71, the distances from the two sections of the annular magnetic core 5 to the mounting box 3 are exactly equal, so that the accurate current value can be conveniently measured.

It should be noted that the above-mentioned annular magnetic core 5 may be a cylindrical shape with a bottom surface being a concentric circle, or may be a cylindrical shape with a bottom surface being a coaxially arranged rounded rectangle, and the shape of the annular magnetic core 5 may be adaptively designed according to actual needs.

In order to facilitate the receiving surface 21 to receive the magnetic induction lines, in the present application, the hall element 2 is installed in the case 31 at a corner near the bottom surface, and accordingly, the toroidal core 5 is also required to be placed at a position corresponding to the hall element 2.

Referring to fig. 1, the clamping member 4 is disposed on the top surface of the mounting box 3 and used for fixing a cable to be tested. Specifically, the clamping piece 4 is connected with the mounting box 3 in a sliding manner.

Referring to fig. 1 to 3, a slide rail 9 is fixedly provided along the top surface of the mounting box 3. When the bottom surface of the mounting box 3 is placed downwards in a horizontal posture and the annular magnetic core 5 is placed on the limiting plate 7, the slide rail 9 and the axis of the annular magnetic core 5 are in the same direction. Preferably, the slide rail 9 is fixed to the top of the mounting box 3 by a fixed connection such as a bolt connection. In the present application, the slide rail 9 has a T-shaped groove 91, and the T-shaped groove 91 extends along the length direction of the slide rail 9, and the length thereof is the same as the length of the slide rail 9. Of course, the slide rail 9 may have another shape that allows the card member 4 to slide.

Referring to fig. 3, the card member 4 includes a slide portion 41 and a stopper portion 42. The sliding part 41 is matched with the slide rail 9 in shape, and is preferably I-shaped in the application. The limiting portion 42 is fixedly disposed on a surface of the sliding portion 41 away from the slide rail 9. Specifically, the limiting portion 42 is annular and has a notch along its radial direction. The notch is preferably located on a horizontal plane where the axis of the limiting portion 42 is located, and of course, may be located on other positions of the limiting portion 42, so that the worker can clip the cable to be tested into the limiting portion 42. Considering that the cable to be tested may have various sizes, the position limiting portion 42 has certain elasticity, so that the worker can clamp the cables to be tested with different sizes into the position limiting portion 42.

Further, in order to obtain better fixing effect, the clip 4 on the slide rail 9 may be provided with a plurality, here a plurality means at least three. Specifically, the worker sequentially clips the cable to be tested into the limiting parts 42 of all the clamping pieces 4, and then moves each clamping piece 4 to straighten the part of the cable to be tested, which penetrates through the annular magnetic core 5.

Referring to fig. 2 and 3, certainly, there may be two clamping pieces 4 on the slide rail 9, and the notches of the limiting parts 42 of the two clamping pieces 4 are arranged on the slide rail 9 in a posture with opposite directions, so that the circumferential direction of the cable to be measured can be fixed, and a better fixing effect is achieved.

Considering that the card member 4 may exceed the length range of the slide rail 9 during the moving process, two ends of the slide rail 9 are respectively and fixedly provided with a limiting member 92.

With reference to fig. 4, it is worth to mention that the accuracy of the measurement results is also affected by the position of the cable to be measured passing through the toroidal core 5, i.e. the more accurate the measurement results are closer to the axis of the toroidal core 5. Therefore, when the high-stability hall current sensor of the present application is manufactured, it is necessary to align the axis of the stopper portion 42 with the axis of the annular magnetic core 5 as much as possible, depending on the size of the mounting box 3, the thickness of the slide rail 9, the thickness of the sliding portion 41 and the radius of the stopper portion 42, the inner diameter and the outer diameter of the annular magnetic core 5, and the like.

Referring to fig. 2, the box body 31, the box cover 32, the limiting plate 7, the baffle 8, the slide rail 9, the limiting member 92 and the clip 4 can be made of plastic materials. It should be noted that the clip member 4 should be made of plastic material with certain elasticity.

The implementation principle of the high-stability Hall current sensor in the embodiment of the application is as follows: through set up slide rail 9 on mounting box 3 and set up fastener 4 on slide rail 9 for the staff can block the cable card that awaits measuring into fastener 4, and adjust the position of fixing the cable that awaits measuring through removing fastener 4, with the part that will await measuring the cable and pass annular magnetic core 5 flare-out and be fixed in the position of annular magnetic core 5 axis, and then make hall current sensor measuring result comparatively accurate.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. A high stability hall current sensor which characterized in that: the magnetic core comprises an installation box (3) provided with a PCB (1) and a Hall element (2) and an annular magnetic core (5) with a gap;

the mounting box (3) is placed at the notch of the annular magnetic core (5), the mounting box (3) is provided with two opposite horizontal planes, at least two clamping pieces (4) used for fixing a cable to be tested are arranged on one horizontal plane, and the at least two clamping pieces (4) are in sliding connection with the mounting box (3).

2. The hall current sensor of claim 1 wherein: a sliding rail (9) is arranged on the upper horizontal plane of the mounting box (3), the clamping piece (4) comprises a sliding part (41), and the sliding part (41) is matched with the sliding rail (9) and is in sliding connection with the sliding rail (9).

3. The hall current sensor of claim 2 wherein: one surface of the sliding part (41) far away from the sliding rail (9) is fixedly provided with a limiting part (42), the limiting part (42) is annular, and a notch is formed in the limiting part (42) along the radial direction of the limiting part.

4. The hall current sensor of claim 3 wherein: the stopper (42) has elasticity.

5. The hall current sensor of claim 4 wherein: and limiting parts (92) are fixedly arranged at two ends of the sliding rail (9) respectively.

6. The hall current sensor of claim 5 wherein: the number of the clamping pieces (4) is two.

7. The hall current sensor of claim 6 wherein: the notches of the two limiting parts (42) are arranged in opposite orientations.

8. The high stability hall current sensor according to claim 7 wherein: the mounting box (3) comprises a box body (31) and a box cover (32), wherein the box cover (32) is detachably connected with the box body (31) in a sliding mode.

9. The hall current sensor of claim 8 wherein: lid (32) and box body (31) are kept away from one side that a side that keeps away from each other of slide rail (9) lid (32) and box body (31) extends respectively has limiting plate (7), the fixed baffle (8) that is provided with of side that mounting box (3) were kept away from in limiting plate (7), baffle (8) perpendicular to limiting plate (7), and be located one side at mounting box (3) place.

10. The hall current sensor of claim 9 wherein: and a raised reference line (71) is marked on one side of the limiting plate (7) close to the mounting box (3).

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