CN220626493U

CN220626493U - High-precision shunt

Info

Publication number: CN220626493U
Application number: CN202322257010.0U
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Shenzhen Xinweier Electronics Co Ltd
Current assignee: Shenzhen Xinweier Electronics Co Ltd
Priority date: 2023-08-22
Filing date: 2023-08-22
Publication date: 2024-03-19
Anticipated expiration: 2033-08-22

Abstract

The utility model provides a high-precision current divider, which comprises an upper cover plate, a current divider, a lower cover plate, an input end and an output end, wherein the two ends of the current divider are respectively provided with the upper cover plate and the lower cover plate, the middle part of the upper cover plate is provided with a through hole, the input end is embedded in the through hole in the middle part of the upper cover plate, the middle part of the lower cover plate is also provided with a through hole, the output end is embedded in the through hole in the middle part of the lower cover plate, the current divider comprises a front current collecting plate, a middle current collecting plate and a rear current collecting plate, the front current collecting plate is arranged on the upper cover plate, one end of the current collecting plate is connected with the front current collecting plate, and the other end of the current collecting plate penetrates through the middle current collecting plate to be connected with the rear current collecting plate, and the beneficial effects of the utility model are that: the current divider has a simple structure, can be used for measuring high-frequency alternating current and pulse current, has equal and opposite current flowing through the inner layer and the outer layer in a double-layer structure, and can offset magnetic fields generated during working, so that the performance of the current divider is improved.

Description

High-precision shunt

Technical Field

The utility model relates to the technical field of current measuring devices, in particular to a high-precision current divider.

Background

The current measurement technology is a basic scientific technology and is widely applied to various fields of national production. The main method for measuring the current comprises the following steps: current dividers, current transformers, rogowski coils, hall current sensors, photoelectric sensors, and the like. The current value is obtained by measuring the voltage on the current divider and calculating the resistance value of the current divider by utilizing ohm law to convert wide-frequency heavy current into small voltage which is easy to accurately measure, the principle is visual, the accuracy is high, the response speed is high, and the current measuring method is the simplest and direct method and is widely applied to the field of current measurement.

The common current divider structure in the prior art comprises a coaxial cylindrical divider and a PCB structure cage-shaped divider, but the coaxial cylindrical divider is limited by the structural shape and the processing technology, so that the resistance value of the coaxial cylindrical divider is difficult to be the same as the preset resistance value; and the PCB structure cage-type current divider has larger resistance due to the thickness of copper distribution, so that the temperature rise in use is large, and the measuring range of the current divider is difficult to break through 100A.

Particularly, when the shunt is used to measure a broadband (or pulse) current, the structural design of the shunt has a great influence on the performance of the shunt, so that it is required to provide an excellent structural design to realize the precise measurement of the broadband (or pulse) current.

Chinese patent CN106526272B discloses a precise current divider, which is characterized in that: the shunt is of a double-layer cage-shaped structure and comprises an outer cage bar and an inner cage bar coaxially arranged with the outer cage bar, cage columns are arranged on the inner cage bar and the outer cage bar to form a cage column pair, two ends of the outer cage bar are connected with a first conductive disc and a second conductive disc, two ends of the inner cage bar are respectively connected with the second conductive disc and a third conductive disc, a through hole is formed in the third conductive disc for the cage column of the outer cage bar to pass through in a non-conductive manner, a central wire is arranged in the center of the inner cage bar, one end of the central wire is connected with the second conductive disc, the other end of the central wire passes through the third conductive disc in a non-conductive manner, and a gap or an insulating part exists between the third conductive disc and the cage column of the outer cage bar; the non-conductive passing between the third conductive disc and the central wire is in a mode of having a gap or having an insulating part; a convex electrode is arranged at the center of one side of the first conductive disc, which is far away from the second conductive disc; the current flow path of the current divider is composed of a convex electrode, a first conductive disc, an outer cage column, a second conductive disc, an inner cage column and a third conductive disc; the voltage at the two ends of the inner cage bar can be obtained by detecting the potential difference between the central wire and the third conductive plate, and then the measured current can be obtained according to the resistance value of the inner cage bar; the rated parameters of the shunt can be changed by changing the material, width, length and thickness of the cage bars; the cage column is of a layered structure and comprises an inner layer and a surface layer coating the outer side of the inner layer, wherein the conductivity of the surface layer material is smaller than that of the inner layer material; the radius of the inner layer material is smaller than the skin depth of the material, so that the shunt can be used for high-frequency alternating current measurement and also can be used for pulse current measurement. The coaxial main body structure ensures good high-frequency characteristics of the shunt. The current flowing through the inner layer and the outer layer in the double-layer cage-shaped structure is equal in size and opposite in direction, magnetic fields generated during operation can be mutually offset, and the performance of the shunt is improved. For the measurement of broadband current, the current path of the current divider is in a thin cylindrical shape, and the parasitic inductance is small, so that the measurement accuracy is improved. The current divider adopts an open structure, and can better dissipate heat. The cost of the current divider is relatively low and the current divider has wider measuring range because of no use of a precise resistor.

Disclosure of Invention

The utility model aims to solve the technical problems and provide the novel high-precision current divider which can be used for measuring high-frequency alternating current and pulse current, wherein the currents flowing through the inner layer and the outer layer in the double-layer structure are equal in magnitude and opposite in direction, magnetic fields generated during operation can be mutually offset, and the performance of the current divider is improved.

The utility model is realized by the following technical scheme:

the utility model provides a high accuracy shunt, includes upper cover plate, diverging device, lower apron, input, output, diverging device both ends are equipped with upper cover plate, lower apron respectively, the upper cover plate middle part is equipped with the through-hole, the input embedding is in the through-hole at upper cover plate middle part, the lower apron middle part also is equipped with the through-hole, the output embedding is in the through-hole at lower cover plate middle part, diverging device includes preceding busbar, flow distribution plate, well busbar, back busbar, preceding busbar is installed on the upper cover plate, flow distribution plate one end with preceding busbar is connected, the busbar other end pass well busbar with the back busbar is connected.

Further, the device also comprises a grounding end, and the grounding end is arranged on the lower cover plate.

Further, studs are arranged on the periphery of the upper cover plate, and studs are also arranged on the periphery of the lower cover plate.

Further, round holes are formed in the periphery of the front bus plate, probe through holes are formed in the middle of the front bus plate, splitter plate mounting holes are formed in the front bus plate, studs on the periphery of the upper cover plate are inserted into the round holes on the periphery of the front bus plate and fixed on the front bus plate, and input ends penetrate through the through holes in the middle of the upper cover plate and the probe through holes in the middle of the front bus plate to be connected with the front bus plate and fixed on the front bus plate.

Further, a plurality of splitter plate mounting holes are formed in the middle bus plate, and a through hole is formed in the middle of the middle bus plate.

Further, the rear bus plate is provided with a plurality of splitter plate mounting holes, the middle part of the rear bus plate is provided with a through hole, and the through hole in the middle part of the rear bus plate and the through hole in the middle part of the middle bus plate are concentric holes.

Further, protruding points are arranged at two ends of the splitter plate, and the protruding points at two ends of the splitter plate are respectively embedded into splitter plate mounting holes on the front splitter plate, splitter plate mounting holes on the middle splitter plate and splitter plate mounting holes on the rear splitter plate and are respectively fixed on the front splitter plate, the middle splitter plate and the rear splitter plate.

Further, the rear end of the splitter plate is provided with a plurality of resistors.

The utility model has the beneficial effects that: the current divider has a simple structure, can be used for measuring high-frequency alternating current and pulse current, has equal and opposite current flowing through the inner layer and the outer layer in a double-layer structure, and can offset magnetic fields generated during working, so that the performance of the current divider is improved.

Drawings

FIG. 1 is a schematic diagram of a high-precision shunt according to the present utility model;

FIG. 2 is a schematic diagram of an explosion structure of the high-precision shunt of the present utility model;

reference numerals: 1. an upper cover plate; 11. a through hole; 12. a stud; 2. a shunt device; 21. a front bus plate; 210. a round hole; 211. a probe through hole; 212. a diverter plate mounting hole; 22. a diverter plate; 220. a bump; 221. a resistor; 23. a middle bus plate; 24. a rear bus plate; 3. a lower cover plate; 4. an input end; 5. an output end; 6. and a grounding end.

Detailed Description

The utility model is further described with reference to the accompanying drawings and detailed description below:

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 application belongs; the terminology used in the description of the applications herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

Embodiment is referring to as shown in fig. 1-2, a high-precision diverter comprises an upper cover plate 1, a diverter 2, a lower cover plate 3, an input end 4 and an output end 5, wherein the upper cover plate 1 and the lower cover plate 3 are respectively arranged at two ends of the diverter 2, a through hole 11 is arranged in the middle of the upper cover plate 1, the input end 4 is embedded in the through hole 11 in the middle of the upper cover plate 1, the through hole 11 is also arranged in the middle of the lower cover plate 3, the output end 5 is embedded in the through hole 11 in the middle of the lower cover plate 3, the diverter 2 comprises a front bus plate 21, a diverter 22, a middle bus plate 23 and a rear bus plate 24, the front bus plate 21 is arranged on the upper cover plate 1, one end of the diverter 22 is connected with the front bus plate 21, and the other end of the diverter 22 penetrates through the middle bus plate 23 and is connected with the rear bus plate 24.

Preferably, the lower cover plate 3 further comprises a grounding end 6, and the grounding end 6 is arranged on the lower cover plate 3.

Preferably, studs 12 are arranged around the upper cover plate 1, and studs 12 are also arranged around the lower cover plate 3.

Preferably, round holes 210 are formed around the front bus plate 21, probe through holes 211 are formed in the middle of the front bus plate 21, splitter plate mounting holes 212 are formed in the front bus plate 21, studs 12 around the upper cover plate 1 are inserted into the round holes 210 around the front bus plate 21 and fixed on the front bus plate 21, and the input end 4 penetrates through the through holes 11 in the middle of the upper cover plate 1 and the probe through holes 211 in the middle of the front bus plate 21 to be connected with the front bus plate 21 and fixed on the front bus plate 21.

Preferably, the middle bus plate 23 is provided with a plurality of splitter plate mounting holes 212, and the middle portion of the middle bus plate 23 is provided with a through hole 11.

Preferably, the rear bus plate 24 is provided with a plurality of splitter plate mounting holes 212, the middle part of the rear bus plate 24 is provided with a through hole 11, and the through hole 11 in the middle part of the rear bus plate 24 and the through hole 11 in the middle part of the middle bus plate 23 are concentric holes.

Preferably, the two ends of the splitter plate 22 are provided with protruding points 220, and the protruding points 220 of the two ends of the splitter plate 22 are respectively embedded in the splitter plate mounting holes 212 on the front bus plate 21, the splitter plate mounting holes 212 on the middle bus plate 23 and the splitter plate mounting holes 212 on the rear bus plate 24, and are respectively fixed on the front bus plate 21, the middle bus plate 23 and the rear bus plate 24.

Preferably, the rear end of the splitter plate 22 is provided with a plurality of resistors 221.

In summary, the high-precision current divider can be used for measuring high-frequency alternating current and pulse current, currents flowing through the inner layer and the outer layer in the double-layer structure are equal in size and opposite in direction, magnetic fields generated during operation can be offset, and the performance of the current divider is improved.

Modifications and variations of the above embodiments will be apparent to those skilled in the art in light of the above teachings. Therefore, the utility model is not limited to the specific embodiments disclosed and described above, but some modifications and changes of the utility model should be also included in the scope of the claims of the utility model. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present utility model in any way.

Claims

1. A high precision shunt, characterized in that: including upper cover plate, diverging device, lower apron, input, output, diverging device both ends are equipped with upper cover plate, lower apron respectively, the upper cover plate middle part is equipped with the through-hole, the input embedding is in the through-hole at upper cover plate middle part, the lower apron middle part also is equipped with the through-hole, the output embedding is in the through-hole at lower apron middle part, diverging device includes preceding busbar, flow distribution plate, well busbar, back busbar, preceding busbar is installed on the upper cover plate, flow distribution plate one end with preceding busbar is connected, the flow distribution plate other end pass well busbar with the back busbar is connected.

2. The high precision shunt according to claim 1, wherein: the lower cover plate is provided with a grounding end.

3. The high precision shunt according to claim 1, wherein: studs are arranged on the periphery of the upper cover plate, and studs are also arranged on the periphery of the lower cover plate.

4. A high precision shunt according to claim 3, characterised in that: the front bus plate is provided with round holes all around, the middle part of the front bus plate is provided with probe through holes, the front bus plate is provided with splitter plate mounting holes, studs around the upper cover plate are inserted into the round holes around the front bus plate and fixed on the front bus plate, and the input end penetrates through the through holes in the middle part of the upper cover plate and the probe through holes in the middle part of the front bus plate to be connected with the front bus plate and fixed on the front bus plate.

5. The high precision shunt according to claim 1, wherein: the middle bus plate is provided with a plurality of splitter plate mounting holes, and the middle part of the middle bus plate is provided with a through hole.

6. The high precision shunt according to claim 5, wherein: be equipped with a plurality of flow distribution plate mounting hole on the back busbar, back busbar middle part is equipped with the through-hole, the through-hole in back busbar middle part with the through-hole in well busbar middle part is concentric hole.

7. The high precision shunt according to claim 1, wherein: the utility model discloses a flow distribution plate, including front busbar, middle busbar, back busbar, flow distribution plate mounting hole, the flow distribution plate is equipped with the bump at flow distribution plate both ends, the bump at flow distribution plate both ends imbeds respectively in the flow distribution plate mounting hole on front busbar, the flow distribution plate mounting hole on well busbar and the flow distribution plate mounting hole on back busbar on, and fix respectively on front busbar, well busbar and the back busbar.

8. The high precision shunt according to claim 7, wherein: the rear end of the flow dividing plate is provided with a plurality of resistors.