CN206096221U - Accurate shunt - Google Patents
Accurate shunt Download PDFInfo
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- CN206096221U CN206096221U CN201621081552.0U CN201621081552U CN206096221U CN 206096221 U CN206096221 U CN 206096221U CN 201621081552 U CN201621081552 U CN 201621081552U CN 206096221 U CN206096221 U CN 206096221U
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- temperature control
- resistance
- circuit
- temperature
- diverter
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- 239000002184 metal Substances 0.000 claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 claims abstract description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 11
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 abstract 1
- 238000004321 preservation Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- 239000011888 foil Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000013097 stability assessment Methods 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
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- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The application discloses accurate shunt is including box body, interior heat preservation, first control by temperature change circuit, a temperature controlled plate, second control by temperature change circuit, the 2nd temperature controlled plate, shunting resistance circuit, the box body is the metal, first control by temperature change circuit, a temperature controlled plate, second control by temperature change circuit, the 2nd temperature controlled plate, shunting resistance lie in inside the box body, a temperature controlled plate, the 2nd temperature controlled plate parallel, the shunting resistance circuit lies in between a temperature controlled plate and the 2nd temperature controlled plate, first control by temperature change circuit, second control by temperature change circuit lie in a temperature controlled plate, the 2nd temperature controlled plate respectively. The shunting resistance circuit contains at least one series resistance circuit, further contains first resistance and second resistance, the temperature coefficient of first resistance and second resistance is opposite, the temperature coefficient absolute value differs is less than 2ppm DEG C, stability variation opposite direction, stable index and is less than the 1ppm moon. The utility model discloses reduce the influence of ambient temperature to accurate shunt, improved measurement accuracy.
Description
Technical field
The application is related to collimation technique field, a kind of new accurate diverter.
Background technology
The output current of electric installation is calibrated, the most common method direct method of measurement is that is, straight using digital electronic ammeter
Connect measurement its output current calibrated.At present the accuracy of measurement of high accuracy number ammeter DC current ± 0.01%～
± 0.005%, even if using the indirect method of measurement, DC voltage is converted into by DC current is exported with diverter, then again to straight
Stream voltage carries out accurate measurement, and the accurate diverter highest accuracy for using at present also only has ± 0.001%.These measuring methods
Cannot meet some superhigh precision electric installations (such as a kind of inertial navigation accelerometer simulator, its technical specification 5 μ A～
Up to ± alignment requirements 0.0005%) in 50mA.Because the certainty of measurement of high-accuracy diverter can be subject to ambient temperature
Impact, how to eliminate or sword celestial being ambient temperature effect, improve diverter certainty of measurement, be one need solve problem.
Utility model content
The purpose of this utility model is to provide a kind of accurate diverter, the current precision diverter temperature influence of solution,
The not enough problem of certainty of measurement.
A kind of accurate diverter embodiment disclosed in this utility model, including box body, internal layer, the first temperature control circuit, first
Temperature control plate, the second temperature control circuit, the second temperature control plate, shunt resistance circuit；The box body is metal；First temperature control circuit,
First temperature control plate, the second temperature control circuit, the second temperature control plate, shunt resistance circuit are located at the tray interior；The internal layer is located at
The inner surface of the box body；The internal layer is heat-barrier material；First temperature control plate and second temperature control plate are placed in parallel；Institute
State shunt resistance circuit to be located between first temperature control plate and the second temperature control plate；First temperature control circuit is located at described first
On temperature control plate；Second temperature control circuit is located on second temperature control plate.
Usually, the shunt resistance circuit is also comprising high side current end, low level current terminal, high-order voltage end, low level electricity
Pressure side, extends to the box portion outside；The high side current end and the low level current terminal are used to access electric current to be measured；The height
Position voltage end and the low level voltage end are used for output signal voltage.
Used as the embodiment that this utility model further optimizes, the shunt resistance circuit includes at least one series resistance
Circuit；The series resistance circuit includes first resistor and second resistance；The temperature of the first resistor and the second resistance
Coefficient is contrary；The absolute value temperature coefficient difference of the first resistor and the second resistance is less than 2ppm/ DEG C.
Become as the stability of the embodiment that this utility model further optimizes, the first resistor and the second resistance
Change in opposite direction；The stability indicator of the first resistor and the second resistance is less than the 1ppm/ months.
Used as the embodiment that this utility model further optimizes, the shunt resistance circuit is series electrical described in two or more
Resistance circuit is composed in parallel." two or more " described in this utility model application documents, the situation comprising two or more.
Used as most preferred embodiment of the present utility model, the first resistor and the second resistance are metal foil resistor.
Used as most preferred embodiment of the present utility model, first temperature control circuit and second temperature control circuit are bridge-type temperature
Control circuit.First temperature control circuit is identical with the circuit parameter of second temperature control circuit；First temperature control circuit and institute
The temperature control value for stating the second temperature control circuit is identical.
Used as most preferred embodiment of the present utility model, first temperature control plate and second temperature control plate are high by thermal conductivity
Metal is made, for example copper.
Above-mentioned at least one technical scheme that the embodiment of the present application is adopted can reach following beneficial effect：This utility model
Bulk temperature coefficient is reduced using the pairing of Positive and Negative Coefficient Temperature resistance；Temperature control space is solved additionally by two-sided self-balancing framework
Temperature stability and temperature gradient explained, temperature stability is high.So as to reduce impact of the ambient temperature to accurate diverter, carry
High certainty of measurement.
Description of the drawings
Accompanying drawing described herein is used for providing further understanding of the present application, constitutes the part of the application, this Shen
Schematic description and description please does not constitute the improper restriction to the application for explaining the application.In the accompanying drawings：
Fig. 1 is a kind of embodiment schematic diagram of the present utility model；
Fig. 2 is shunt resistance circuit embodiments schematic diagram described in this utility model；
Fig. 3 is each end structure schematic diagram of the shunt resistance.
Specific embodiment
To make purpose, technical scheme and the advantage of the application clearer, below in conjunction with the application specific embodiment and
Corresponding accompanying drawing is clearly and completely described to technical scheme.Obviously, described embodiment is only the application one
Section Example, rather than the embodiment of whole.Based on the embodiment in the application, those of ordinary skill in the art are not doing
Go out the every other embodiment obtained under the premise of creative work, belong to the scope of the application protection.
Fig. 1 is a kind of accurate diverter embodiment schematic diagram.
The accurate diverter includes：Box body 11, internal layer 12, the first temperature-adjusting circuit 13, the second temperature control circuit 110, first
Temperature control plate 14, the second temperature control plate 19, shunt resistance circuit 111；High side current end 15, high-order voltage end 16, low level voltage end 17,
Low level current terminal 18.
The box body is metal structure, and the shunt resistance circuit is electromagnetically shielded, and can reduce the interference in the external world.
On outside metal structure box serve as a contrast one layer of heat-barrier material, i.e. internal layer 12, can effectively smooth heat sink when cooling song
Line, reduces temperature fluctuation value, makes constant-temperature precision higher.
In order to improve the stability of the shunt resistance circuit 111, control is solved using the two-sided self-balancing framework of multiparty control
The temperature stability and temperature gradient explained in warm space.Respectively one temperature control plate (first temperature control of setting up and down in whole temperature control space
Plate, the second temperature control plate), using the high copper coin of thermal conductivity, two temperature control plates are completely the same, and energy constant temperature is in same value.Use
Copper coin can make the temperature control plate be more uniformly distributed the heat radiation in temperature control space, be conducive to temperature balance control, it is to avoid large space
Interior temperature is uneven.
First temperature control circuit and the second temperature control circuit adopt bridge-type temperature-adjusting circuit, on temperature control plate.Due to copper coin
Thermal conductivity it is high, make the temperature control in whole plane be easier to reach balance, and each bridge-type temperature-adjusting circuit use it is identical
Circuit parameter, the temperature control value of each circuit is identical.The final constant temperature of two temperature control plates is in same setting value.
The shunt resistance circuit is also comprising high side current end 15, high-order voltage end 16, low level voltage end 17, low level electric current
End 18, extends to the box portion outside；The high side current end and the low level current terminal are used to access electric current to be measured；The height
Position voltage end and the low level voltage end are used for output signal voltage.
The element of the shunt resistance circuit adopts metal foil resistor, its temperature coefficient to be about 5ppm/ DEG C, usual electromagnetism
The temperature control of Measurement Laboratory requires to be 20 DEG C ± 1 DEG C, i.e., temperature shadow of the described shunt resistance circuit at 20 DEG C of laboratory environment
The amount of sound is about 5ppm.
Fig. 2 is shunt resistance circuit embodiments schematic diagram described in this utility model.The shunt resistance circuit is by multiple
Resistance is through series connection and composition in parallel.Respectively from positive temperature coefficient and the batch resistance of negative temperature coefficient two.First with resistance electricity
Bridge carries out stability assessment, screening to resistance, and the temperature coefficient of the resistance is tested, and is offset using Positive and Negative Coefficient Temperature
Mode carry out resistance pairing.Set by counting resistance, parallel-connection structure using the metal foil resistor of high stable, low-temperature coefficient
Meter uses power to increase it, reduces it and uses caloric value.
As an example of the internal structure of the shunt resistance circuit 111, by first resistor R1, second resistance R2,
3rd resistor R3, the 4th resistance R4 are constituted.
Resistance R1～R4 meets claimed below：The stability indicator of R1～R4 is respectively less than the 1ppm/ months.
Resistance R1 and R2 constitute the first series resistance circuit, the stability change of R1 and R2 (the i.e. resistance of R1 in opposite direction
If becoming larger, the resistance of R2 should be tapered into, and vice versa), and the absolute value of change slope answers equal or as far as possible close；
R1 (i.e. R1 is positive temperature coefficient, then R2 is negative temperature coefficient, and vice versa) contrary with the temperature coefficient of R2, and the temperature of R1 and R2
The absolute value of degree coefficient is answered equal or as far as possible close (temperature coefficient after positive and negative counteracting is better than 2ppm/ DEG C).
Resistance R3 and R4 constitute the second series resistance circuit, the stability change of R3 and R4 (the i.e. resistance of R3 in opposite direction
If becoming larger, the resistance of R4 should be tapered into, and vice versa), and the absolute value of change slope answers equal or as far as possible close；
R3 (i.e. R3 is positive temperature coefficient, then R4 is negative temperature coefficient, and vice versa) contrary with the temperature coefficient of R4, and the temperature of R3 and R4
The absolute value of degree coefficient is answered equal or as far as possible close (temperature coefficient after positive and negative counteracting is better than 2ppm/ DEG C).
The first series resistance circuit and the second series resistance circuit are parallel with one another, constitute the shunt resistance electricity
Road.
It is each end structure schematic diagram of the shunt resistance such as Fig. 3, the shunt resistance circuit also includes high side current end
15th, low level current terminal 18, high-order voltage end 16, low level voltage end 17, extend to the box portion outside, concrete mode：High-order electricity
Stream, low level electric current, high-order voltage, low level voltage penetrate box body and Nei Bao when respectively end extends to box portion outside using red copper binding post
Warm layer.Outside adopts dielectric protection layer, each binding post 15-18 and box when wherein red copper binding post penetrates box body and inner thermal insulating layer
Body and inner thermal insulating layer are dielectrically separated from.
Embodiment disclosed in the utility model, has the advantages that：The design is tested through temperature coefficient, is adopted
The pairing of Positive and Negative Coefficient Temperature resistance can make its temperature coefficient be reduced to less than 2ppm/ DEG C, and in addition we are double by multiparty control
Self-balancing framework in face solves the temperature stability and temperature gradient explained in temperature control space, control temperature at 35 DEG C ± 0.2 DEG C (i.e.：
When control temperature is set in 35 DEG C, temperature-controlled precision can reach ± 0.2 DEG C).Experiment shows, the diverter is in 30 DEG C of ambient temperature
Temperature influence amount under following wide use range is about 0.4ppm, and than traditional diverter technology a magnitude is reduced.
Also, it should be noted that term " including ", "comprising" or its any other variant are intended to nonexcludability
Comprising so that a series of process, method, commodity or equipment including key elements not only includes those key elements, but also wrapping
Other key elements being not expressly set out are included, or also includes intrinsic for this process, method, commodity or equipment wanting
Element.In the absence of more restrictions, the key element for being limited by sentence "including a ...", it is not excluded that wanting including described
Also there is other identical element in process, method, commodity or the equipment of element.
Embodiments herein is the foregoing is only, the application is not limited to.For those skilled in the art
For, the application can have various modifications and variations.All any modification, equivalents made within spirit herein and principle
Replace, improve etc., within the scope of should be included in claims hereof.
Claims (10)
1. a kind of accurate diverter, it is characterised in that include
Box body, inner thermal insulating layer, the first temperature control circuit, the first temperature control plate, the second temperature control circuit, the second temperature control plate, shunt resistance electricity
Road；
The box body is metal；
First temperature control circuit, the first temperature control plate, the second temperature control circuit, the second temperature control plate, shunt resistance circuit are located at described
Tray interior；
The inner thermal insulating layer is located at the inner surface of the box body；
The inner thermal insulating layer is heat-barrier material；
First temperature control plate and second temperature control plate are placed in parallel；
The shunt resistance circuit is located between first temperature control plate and the second temperature control plate；
First temperature control circuit is located on first temperature control plate；
Second temperature control circuit is located on second temperature control plate.
2. as claimed in claim 1 precision diverter, it is characterised in that
The shunt resistance circuit includes at least one series resistance circuit；
The series resistance circuit includes first resistor and second resistance；
The temperature coefficient of the first resistor and the second resistance is contrary；
The absolute value temperature coefficient difference of the first resistor and the second resistance is less than 2ppm/ DEG C.
3. as claimed in claim 2 precision diverter, it is characterised in that
The stability change of the first resistor and the second resistance is in opposite direction；
The stability indicator of the first resistor and the second resistance is less than the 1ppm/ months.
4. as claimed in claim 2 precision diverter, it is characterised in that the shunt resistance circuit is to connect described in two or more
Resistance circuit is composed in parallel.
5. as claimed in claim 2 precision diverter, it is characterised in that the first resistor and the second resistance are metal forming
Resistance.
6. the accurate diverter as described in claim 1-5 any one, it is characterised in that first temperature control circuit and described the
Two temperature control circuits are bridge-type temperature control circuit.
7. the accurate diverter as described in claim 1-5 any one, it is characterised in that
First temperature control circuit is identical with the circuit parameter of second temperature control circuit；
First temperature control circuit is identical with the temperature control of second temperature control circuit value.
8. the accurate diverter as described in claim 1-5 any one, it is characterised in that
The shunt resistance circuit includes high side current end, low level current terminal, high-order voltage end, low level voltage end, extends to institute
State box portion outside；
The high side current end and the low level current terminal are used to access electric current to be measured；
The high-order voltage end and the low level voltage end are used for output signal voltage.
9. the accurate diverter as described in claim 1-5 any one, it is characterised in that first temperature control plate and described second
Temperature control plate is made up of the high metal of thermal conductivity.
10. as claimed in claim 9 precision diverter, it is characterised in that the metal is copper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621081552.0U CN206096221U (en) | 2016-09-26 | 2016-09-26 | Accurate shunt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621081552.0U CN206096221U (en) | 2016-09-26 | 2016-09-26 | Accurate shunt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206096221U true CN206096221U (en) | 2017-04-12 |
Family
ID=58480877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621081552.0U Active CN206096221U (en) | 2016-09-26 | 2016-09-26 | Accurate shunt |
Country Status (1)
| Country | Link |
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| CN (1) | CN206096221U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107505483A (en) * | 2017-10-13 | 2017-12-22 | 沃尔特电子（苏州）有限公司 | A kind of high current, voltage monitor and method |
| CN111044767A (en) * | 2019-12-05 | 2020-04-21 | 北京东方计量测试研究所 | Pulse current divider |
-
2016
- 2016-09-26 CN CN201621081552.0U patent/CN206096221U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107505483A (en) * | 2017-10-13 | 2017-12-22 | 沃尔特电子（苏州）有限公司 | A kind of high current, voltage monitor and method |
| CN111044767A (en) * | 2019-12-05 | 2020-04-21 | 北京东方计量测试研究所 | Pulse current divider |
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