CN217212858U

CN217212858U - Anti-magnetic field current divider and electric power instrument thereof

Info

Publication number: CN217212858U
Application number: CN202220118304.8U
Authority: CN
Inventors: 朱永虎; 沈华飞
Original assignee: Tongxiang Weida Electronics Co ltd
Current assignee: Tongxiang Weida Electronics Co ltd
Priority date: 2022-01-17
Filing date: 2022-01-17
Publication date: 2022-08-16
Anticipated expiration: 2032-01-17

Abstract

The utility model relates to an anti-magnetic field shunt and an electric power instrument thereof, which comprises a sheet shunt and a PCB board, wherein the sheet shunt comprises a current inflow end, a resistor body and a current outflow end; the resistor body is mechanically divided into an upper resistor body and a lower resistor body which have the same area, and the upper resistor body and the lower resistor body are staggered with each other to form a gap for attaching a plug-in PCB (printed circuit board); the sheet-shaped current divider is provided with a voltage end, a first sampling end and a second sampling end, the first sampling end is arranged at the lower side of the joint of the current inlet end and the lower resistor body, and the second sampling end is arranged at the upper side of the joint of the current outlet end and the upper resistor body; be equipped with voltage end circuit, first sample end circuit, second sample end circuit on the PCB board, wherein be equipped with upside conducting foil, downside conducting foil on the PCB board, first sample end, downside conducting foil, upside conducting foil and first sample end circuit electric connection. So set up, improve the magnetic field current divider detection accuracy of resisting.

Description

Anti-magnetic field current divider and electric power instrument thereof

Technical Field

The utility model relates to an anti magnetic field current divider and electric power instrument thereof for among electric power instrument, especially be applicable to anti magnetic field current divider and electric power instrument in electric energy transmission field.

Background

The current diverter has the advantages of high metering accuracy, small temperature influence and low cost, and is widely applied to single-phase intelligent electric energy meters, in particular to manganin diverters; due to the characteristics of the installation position of the shunt and the connection of the sampling lead, the manganin shunt can generate induced current when being interfered by a power frequency magnetic field, and the accuracy of current metering can be seriously influenced.

The traditional manganin shunt carries out current sampling through a piece of manganin alloy, and the wiring is more dispersed, and the twisted pair of novel shunt needs to carry out point gluing fixed position or to make it difficult loose with the fixed shape of pyrocondensation pipe, and this is not only consuming time and power, still is unfavorable for automated production. In 2013, the enterprise standard of the electric energy meter is revised by national grid company, and in the influence quantity test of Q/GDW 1364 plus 2013 'technical Specification of Single-phase Intelligent electric energy meter', an 'electric energy meter voltage circuit is connected with 115% Un, a current loop has no current, a 0.5mT power frequency magnetic field is applied to the most sensitive part of the electric energy meter affected by the magnetic field, and the electric energy meter is not required to generate more than 1 pulse output within 20 times of theoretical starting time'. The proposal of the standard prompts the electric energy meter industry to actively seek a scheme for improving the anti-electromagnetic interference capability of the electric energy meter.

At present, according to the latest requirements of domestic and external electric energy meter industries, higher requirements are provided for the magnetic field interference resistance of the electric energy meter with small working current, and particularly, when the working current is 20mA or below, under the condition of magnetic field interference with the strength of 0.5mT from an uncertain direction, how to improve the accuracy of electric power detection is a problem which needs to be solved urgently in the industry.

Therefore, there is a need for an improved magnetic shunt and its power meter to improve the ability of the shunt to resist power frequency magnetic field interference.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an anti magnetic field current divider and electric power instrument that also can anti power frequency magnetic field interference ability under less operating current.

In order to achieve the technical purpose, the utility model adopts the following technical means: an anti-magnetic field shunt comprises a sheet shunt and a PCB, wherein the PCB is electrically connected with the sheet shunt,

the sheet-shaped current divider comprises a current inflow end, a resistor body and a current outflow end which are electrically connected in sequence;

the resistor body is mechanically divided into two resistor bodies with the same area along the flowing direction of current flowing through the resistor body, an upper resistor body and a lower resistor body along the flowing direction of the current are formed, the upper resistor body and the lower resistor body are staggered with each other, and gaps are formed by the mutual dislocation for attaching the plug-in PCB;

the sheet-shaped current divider is sequentially provided with a voltage end, a first sampling end and a second sampling end along the flowing direction of current, the first sampling end is arranged on the lower side of the joint of the current flowing-in end and the lower resistor body, and the second sampling end is arranged on the upper side of the joint of the current flowing-out end and the upper resistor body;

the PCB is inserted between the upper side resistor body and the lower side resistor body, a voltage end circuit, a first sampling end circuit and a second sampling end circuit which are respectively used for being electrically connected with the voltage end, the first sampling end and the second sampling end are arranged on the PCB, an upper side conductive foil and a lower side conductive foil which are opposite and have the areas corresponding to the areas of the upper side resistor body and the lower side resistor body are arranged on the PCB, and the first sampling end, the upper side conductive foil and the lower side conductive foil are electrically connected with the first sampling end circuit.

As a further improvement of the utility model, the PCB board is two-sided porose board at least, makes between upside conducting foil and the downside conducting foil realize electric connection through the porose.

As a further improvement of the present invention, the thickness of the PCB plate is offset from the gap size.

As a further improvement of the present invention, the PCB board corresponds to the gap department is equipped with a plurality of via holes portions arranged in proper order, the upside conducting foil with pass through between the downside conducting foil electric connection is realized to the via holes portion.

As a further improvement of the present invention, the PCB is provided with a main body portion which is elongated and is inserted into the gap, and a side portion connected to the side of the main body portion; the voltage end circuit is arranged on the side part; first sample end circuit, upside conducting foil, downside conducting foil, second sample end circuit all locate on the main part, be equipped with the first connecting hole that is used for pegging graft first sample end and the second connecting hole that is used for pegging graft second sample end on the main part, first connecting hole electric connection in on the downside conducting foil, second connecting hole electric connection is on the second sample end circuit.

As a further improvement of the utility model, be packaged with the electrical information module on the PCB board, voltage end circuit, first sample end circuit, second sample end circuit be used for with the electrical information module is connected.

As a further improvement of the utility model, the electric information module comprises a filter element, an analog-to-digital conversion chip and a metering chip.

As a further improvement of the utility model, the resistor body is a manganese-copper resistor body.

As a further improvement of the present invention, the current inlet and the current outlet are provided with through holes for electrically connecting the terminal buttons; or the current inflow end and the current outflow end are not provided with holes and are respectively connected with wiring terminals.

In order to achieve the technical purpose, the utility model discloses still can adopt following technical mode:

an electric power meter comprising an electric power meter housing and the diamagnetic field splitter located within the electric power meter housing.

Compared with the prior art, the utility model discloses flow through the resistive element along the electric current flow direction resistive element machinery and cut into the resistive element that two areas are the same, form along the upward side resistive element and the downside resistive element of electric current flow direction, upward side resistive element and downside resistive element misplace each other, misplace each other and form the gap and be used for pasting the grafting PCB board, be equipped with on the PCB board respectively be used for with voltage end, first sample terminal, second sample terminal electric connection's voltage end circuit, first sample terminal circuit, second sample terminal circuit, wherein be equipped with the area on the PCB board and correspond upward side resistive element, the corresponding and opposite upside conducting foil of downside resistive element area, downside conducting foil, first sample terminal, upside conducting foil, downside conducting foil and first sample terminal circuit electric connection. So set up, the interference killing feature is strong, the reliability is high, works as anti magnetic field current divider is even when being applied to minimum operating current, and in the face of stronger magnetic field interference, its ammeter precision difference can be minimum.

Drawings

Fig. 1 is a schematic structural diagram of a sheet shunt of a first embodiment of the anti-magnetic field shunt of the present invention;

fig. 2 is a schematic view of the structure at another angle in fig. 1.

Fig. 3 is a schematic structural diagram of the diamagnetic field splitter according to the first embodiment of the present invention.

Fig. 4 is a schematic structural view of the connection between the diamagnetic field splitter and the terminal button according to the first embodiment of the present invention.

Fig. 5 is a side view of a first embodiment anti-magnetic field splitter sheet diverter of the present invention.

Fig. 6 is a schematic structural diagram of a PCB board of a diamagnetic field splitter according to a first embodiment of the present invention.

Fig. 7 is a diagram of the insulation layer removed from the PCB board of the anti-magnetic field shunt according to the first embodiment of the present invention.

Fig. 8 is a schematic structural diagram of a sheet shunt of a second embodiment of the anti-magnetic field shunt of the present invention.

Fig. 9 is a schematic view of the structure at another angle in fig. 8.

Fig. 10 is a side view of fig. 8.

Fig. 11 is a schematic view of a further angle in fig. 8.

Fig. 12 is a schematic structural diagram of a diamagnetic field splitter according to a second embodiment of the present invention.

Fig. 13 is an exploded view of a third embodiment of the anti-magnetic field splitter according to the present invention.

Fig. 14 is a schematic structural diagram of a third embodiment of the anti-magnetic field splitter according to the present invention.

Fig. 15 is a schematic structural diagram of a fourth embodiment of the anti-magnetic field current divider according to the present invention.

Fig. 16 is a schematic structural view of a fifth embodiment of the diamagnetic field splitter of the present invention.

Fig. 17 is a schematic structural diagram of a PCB board and a telecommunications system module of a fourth or fifth embodiment of the invention.

Fig. 18 is a schematic view of the structure at another angle in fig. 17.

Fig. 19 is a schematic view of the structure of fig. 17 where the insulating layer is removed.

Reference numerals:

diamagnetic field shunt

100, 200, 300, 400, 500

Current flow inlet ends 11 and 11 'of sheet-shaped current divider 1'

Upper resistor 121 of resistor 12

Lower resistor 122 gap 123

Voltage terminal 101 of

current outflow terminal

13, 13

First sampling terminal 102 and second sampling terminal 103

Anti-slip grooves 141 and 141 'of terminals 14 and 14'

PCB 2 main body part 21

First connection hole 211 and second connection hole 212

Side 22 conductive foil 23

Upper conductive foil 231 and lower conductive foil 232

Voltage terminal circuit 201 of via 24

First sample end circuit 202 and second sample end circuit 203

Terminal button 4 of electric information module 3

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be considered a part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the field of shunt application, as the industry is skilled in the suppliers of market demand, the great knowledge of the problems existing in the prior art is provided by the Vida electronics Limited company, and the research and development team further invests huge capital on the basis of the original technology owned by the research and development team, performs long-time and large-scale tests, scheme screening and a large amount of customer investigation, and finally obtains the technical scheme of the utility model.

Fig. 1 to 19 are schematic structural diagrams of the anti-magnetic field

current splitters

100, 200, 300, 400 and 500 according to the present invention. In a first embodiment, a diamagnetic field shunt 100 includes a sheet shunt 1 and a PCB 2, the PCB 2 is electrically connected to the sheet shunt 1, and the sheet shunt 1 includes a current inlet 11, a resistor 12, and a current outlet 13, which are electrically connected in sequence. The current outlet end 13 and both side end surfaces of the resistor body 12 are welded to one side surface of the current inlet end 11 and one side surface of the current outlet end 13, respectively, to form a three-metal band shape. The resistor body 12 is mechanically divided into two resistor bodies 12 having the same area along the direction of current flowing through the resistor body 12, and an upper resistor body 121 and a lower resistor body 122 are formed along the direction of current flowing, the upper resistor body 121 and the lower resistor body 122 are staggered with each other, and a gap 123 is formed by the staggered arrangement for attaching the socket PCB 2, wherein the "attaching and inserting" means that the PCB 2 is closely placed in parallel with the upper resistor body 121 and the lower resistor body 122, respectively. The sheet shunt 1 is provided with a voltage end 101, a first sampling end 102 and a second sampling end 103 in sequence along the flowing direction of current, the first sampling end 102 is arranged at the lower side of the joint of the current inlet end 11 and the lower resistor body 122, the second sampling end 103 is arranged at the upper side of the joint of the current outlet end 13 and the upper resistor body 121, and the "joint" means that the first sampling end 102 can be arranged on the current inlet end 11 close to the welding seam of the current inlet end 11 and the lower resistor body 122, can be arranged on the resistor body 12 close to the welding seam of the current inlet end 11 and the lower resistor body 122, or can be arranged on the welding seam of the current inlet end 11 and the lower resistor body 122; the second sampling terminal 103 may be provided at the current outflow terminal 13 near the welding between the current outflow terminal 13 and the upper resistor 121, may be provided at the resistor 12 near the welding between the current outflow terminal 13 and the upper resistor 121, or may be provided at the welding between the current outflow terminal 13 and the upper resistor 121. The PCB 2 is vertically inserted between the upper resistive element 121 and the lower resistive element 122, the PCB 2 is provided with a voltage end circuit 201, a first sampling end circuit 202, and a second sampling end circuit 203 for electrically connecting with the voltage end 101, the first sampling end 102, and the second sampling end 103, respectively, wherein the PCB 2 is provided with an upper conductive foil 231 and a lower conductive foil 232 having areas corresponding to and opposite to areas of the corresponding upper resistive element 121 and the corresponding lower resistive element 122, and the first sampling end 102, the upper conductive foil 231, and the lower conductive foil 232 are electrically connected with the first sampling end circuit 202. The areas of the upper conductive foil 231 and the lower conductive foil 232 correspond to the areas of the corresponding upper resistor 121 and lower resistor 122; the upper conductive foil 231 is positioned substantially corresponding to the upper resistor 121 and has substantially the same area; the lower conductive foil 232 has substantially the same area and substantially corresponds to the lower resistor 122. Specifically, the upper conductive foil 231 and the lower conductive foil 232 are respectively located on the front and rear two layers of the PCB 2, and are staggered in the vertical position, so that the shapes and areas of the upper conductive foil 231 and the upper resistor 121 are approximately corresponding, and the PCB 2 insulating layer is spaced, thereby preventing the upper conductive foil 231 and the upper resistor 121 from being short-circuited; the lower conductive foil 232 substantially corresponds to the shape and area of the lower resistor 122 with the insulating layer of the PCB 2 interposed therebetween, and short-circuiting between the lower conductive foil 232 and the lower resistor 122 can be prevented. In this way, when the magnetic field is disturbed by a high intensity magnetic field in an indeterminate direction, the currents generated when the magnetic induction lines are cut by the upper and

lower resistors

121 and 122 can be cancelled by the currents generated when the magnetic induction lines are cut by the upper and lower

conductive foils

231 and 232. In the different embodiments of the present invention, the upper and lower positions of the upper conductive foil 231 and the lower conductive foil 232 are not limited, as long as the upper and lower positions are staggered, the present invention is within the protection scope. Therefore, when the diamagnetic field shunt 100 is applied to a very small operating current, the difference in the electric meter accuracy can be very small in the face of strong magnetic field interference. For example, at an operating current of 20mA or less, the error of the electric meter accuracy of the anti-magnetic field shunt 100 can be less than 10% when the magnetic field interference with the intensity of 0.5mT is encountered, so that the electric meter can achieve excellent anti-magnetic field interference under the condition of extremely small operating current.

The PCB 2 is at least a double-sided perforated plate, so that the upper conductive foil 231 and the lower conductive foil 232 are electrically connected through perforation. So set up, be located the electrically connected can be realized to the conducting foil 231 of upside and the conducting foil 232 of downside on the different aspect of PCB board 2. In this embodiment, the upper conductive foil 231 and the lower conductive foil 232 are respectively located on the front and back side surfaces of the PCB board 2, in other embodiments of the present invention, the PCB board 2 may also be configured with multiple inner conductive layers, as long as the electrical connection of the sampling circuit is realized and the electrical isolation between the sampling circuit and the

corresponding resistor

121, 122 is maintained.

The PCB 2 is provided with a plurality of through holes 24 arranged in sequence corresponding to the gap 123, and the upper conductive foil 231 and the lower conductive foil 232 are electrically connected through the through holes 24. In the illustrated embodiment, the via portions 24 may be in a metal cylindrical shape, and in other embodiments, may have other conductive shapes, and thus, the via portions 24 arranged in sequence may be located at the positions of the slits 123 in the front-back and up-down directions, thereby achieving good electrical connection of the sampling circuit, avoiding short circuit with surrounding components, and improving safety in use. The thickness of the PCB 2 corresponds to the size of the gap 123, so that the PCB 2 can be matched with the gap 123 in shape and position, and better structural stability and power transmission stability can be achieved.

The PCB 2 is provided with a main body 21 which is lengthways and is used for being inserted into the gap 123, and a side part 22 which is connected with the side of the main body 21; the voltage end circuit 201 is arranged on the side portion 22; the first sampling end circuit 202, the conductive foil 23 (i.e., the upper conductive foil 231 and the lower conductive foil 232) and the second sampling end circuit 203 are all disposed on the main body 21, a first connection hole 211 for inserting the first sampling end 102 and a second connection hole 212 for inserting the second sampling end 103 are disposed on the main body 21 at an interval in the up-down direction, the first connection hole 211 is electrically connected to the lower conductive foil 232, and the second connection hole 212 is electrically connected to the second sampling end circuit 203. So set up, PCB board 2 is better with the cooperation installation of slice shunt 1.

Please refer to fig. 15 to 19, which are further optimized and improved according to the present invention, the PCB 2 is packaged with the electrical information module 3, and the voltage end circuit 201, the first sampling end circuit 202, and the second sampling end circuit 203 are connected to the electrical information module 3. By the arrangement, after the diamagnetic field current divider 100 detects the sampling information, the sampled information is immediately converted into a digital signal through the electrical information module 3 on the side for further transmission, and the digital signal can not be interfered by a magnetic field, so that the measurement accuracy of the diamagnetic field current divider 100 is further improved.

Specifically, the electrical information module 3 includes a filter element, an analog-to-digital conversion chip, and a metering chip. So configured, the electrical information module 3 can convert the sampling information detected by the diamagnetic field splitter 100 into a digital signal for transmission.

In the present embodiment, the resistor 12 is a manganin resistor. In this way, an excellent sampling accuracy can be achieved, and of course, in other embodiments of the present invention, the resistor 12 may also be another type of resistor.

Referring to the first embodiment shown in fig. 1 to 5, the current inlet 11 and the current outlet 13 have through holes for electrically connecting the terminal buttons 4; referring to the second embodiment shown in fig. 8 to 12 and the third embodiment shown in fig. 13 to 14, the current inlet end 11 'and the current outlet end 13' of the

diamagnetic field splitters

200 and 300 are connected to the terminals 14 and 14 'respectively without through holes, and the differences between the second and third embodiments include different directions of the terminals 14 and 14', and the terminals 14 and 14 'are provided with concave-convex anti-slip grooves 141 and 141' at their ends, which can prevent the wires (not shown) from being separated during the wire connection process. In various embodiments of the present invention, the current inlet 11 and the current outlet 13 may be planar to directly interface with the terminal; as in the second and third embodiments, the current inlet end 11 'and the current outlet end 13' may be respectively provided in a step shape corresponding to the upper resistor 121 and the lower resistor 122, respectively, as shown in fig. 8 and 14, thereby facilitating the manufacture and assembly with the PCB.

The utility model discloses still protect an electric power instrument (not shown), include electric power instrument shell (not shown) and be located in the electric power instrument shell

diamagnetic field shunt

100, 200, 300, 400, 500. The main core components of the power meter are the magnetic field interference resistance of the

magnetic field splitters

100, 200, 300, 400 and 500, and the magnetic field interference resistance under the condition of low working current and high magnetic field interference of the

magnetic field splitters

100, 200, 300, 400 and 500 can enable the power meter to have excellent power data detection accuracy, so that the power meter has market competitive advantages of the core.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

A series of terms of orientation, such as front, rear, left, right, upper, lower, and the like, used for each technical feature of the above-described embodiments are only used for convenience of description and understanding of each technical feature, and do not limit the specific direction in practical use of the technical solution.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A diamagnetic field shunt is characterized in that: comprises a sheet-shaped shunt and a PCB board, the PCB board is electrically connected with the sheet-shaped shunt,

2. The diamagnetic field splitter according to claim 1, wherein: the PCB is at least a double-sided perforated plate, so that the upper conductive foil and the lower conductive foil are electrically connected through perforation.

3. The diamagnetic field splitter according to claim 1, wherein: the thickness of the PCB corresponds to the size of the gap which is staggered with each other.

4. The diamagnetic field splitter according to claim 1, wherein: the PCB is provided with a plurality of through hole parts which are sequentially arranged corresponding to the gaps, and the upper conductive foil is electrically connected with the lower conductive foil through the through hole parts.

5. The diamagnetic field splitter according to claim 1, wherein: the PCB is provided with a longitudinal main body part which is used for being inserted into the gap, and a side part which is connected with the side of the main body part; the voltage end circuit is arranged on the side part; first sample end circuit, upside conducting foil, downside conducting foil, second sample end circuit all locate on the main part, be equipped with the first connecting hole that is used for pegging graft first sample end and the second connecting hole that is used for pegging graft second sample end on the main part, first connecting hole electric connection in on the downside conducting foil, second connecting hole electric connection is on the second sample end circuit.

6. The diamagnetic field splitter according to claim 1, wherein: the PCB is packaged with an electric information module, and the voltage end circuit, the first sampling end circuit and the second sampling end circuit are used for being connected with the electric information module.

7. The diamagnetic field splitter according to claim 6, wherein: the electric information module comprises a filter element, an analog-to-digital conversion chip and a metering chip.

8. The anti-magnetic field shunt according to claim 1, wherein: the resistor body is a manganese-copper resistor body.

9. The diamagnetic field splitter according to claim 1, wherein: the current inflow end and the current outflow end are provided with through holes for electrically connecting the wiring terminal buttons; or the current inflow end and the current outflow end are not provided with holes and are respectively connected with wiring terminals.

10. An electric power meter characterized in that: comprising a power meter housing and a diamagnetic field splitter according to any one of claims 1 to 9 located within the power meter housing.