CN206096993U - High steady electric current source - Google Patents
High steady electric current source Download PDFInfo
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- CN206096993U CN206096993U CN201621189761.7U CN201621189761U CN206096993U CN 206096993 U CN206096993 U CN 206096993U CN 201621189761 U CN201621189761 U CN 201621189761U CN 206096993 U CN206096993 U CN 206096993U
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- temperature control
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Abstract
The application discloses high steady electric current source 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, current source 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, current source 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. Current source circuit further contains voltage reference circuit and voltage -controlled current source circuit. The utility model discloses reduce the influence of ambient temperature to high steady electric current source, improved measurement accuracy.
Description
Technical field
The application is related to collimation technique field, a kind of new high steady current source.
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%, it is that output DC current is converted into into DC voltage using the indirect method of measurement, then again essence is carried out to DC voltage
Close measurement, the steady current source precision diverter highest accuracy of the height for using at present also only has ± 0.001%.Using direct measurement two
When the method for individual current source difference is calibrated to output current, the output stability for the current source of calibration can affect calibration
Precision, and current source also can be affected by the ambient temperature.These measuring methods cannot meet some superhigh precision electric installations
(such as a kind of inertial navigation accelerometer simulator, its technical specification in 5 μ A～50mA up to ± 0.0005%)
Alignment requirements.Because the output stability of current source can be affected by the ambient temperature, how to eliminate or less ambient temperature shadow
The output stability of current source is rung, improved, is a problem for needing to solve.
Utility model content
The purpose of this utility model is to provide a kind of high steady current source, solves estimated current source temperature influence, output
The not enough problem of stability.
A kind of high steady current source 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, current source circuit；The box body is metal；First temperature control circuit,
One temperature control plate, the second temperature control circuit, the second temperature control plate, current source circuit are located at the tray interior；The internal layer is located at described
The inner surface of box body；The internal layer is heat-barrier material；First temperature control plate and second temperature control plate are placed in parallel；The electricity
Current source circuit is located between first temperature control plate and the second temperature control plate；First temperature control circuit is located at first temperature control plate
On；Second temperature control circuit is located on second temperature control plate.
Usually, the current source circuit also includes high side current end, low level current terminal, extends to the box portion outside.
Used as the embodiment that this utility model further optimizes, the current source circuit is comprising voltage controlled current source circuit and extremely
A few voltage reference circuit；The voltage controlled current source circuit, for Precision reference voltage conversion to be exported into precision current；Institute
Voltage reference circuit is stated, for producing the Precision reference voltage.
Preferably, the voltage reference circuit is multiple；The output voltage of the plurality of voltage reference circuit is parallel with one another.
It is further preferred that the voltage reference circuit is includedLong-time stability and 1.2 μ VP-PIt is super
The reference voltage chip of low noise index.The voltage reference circuit includes Low Drift Temperature precision resistance, polyester film capacitor and height
Performance operational amplifier chip.
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：Usual single electricity
Used as Voltage Reference, after multi-channel parallel, the noise of Voltage Reference is reduced pressure reference circuit, and output reference voltage is that plurality of voltages is defeated
The meansigma methodss for going out, drastically increase the stability of Voltage Reference output voltage, it is ensured that the output stability of voltage-controlled current source.
Its temperature coefficient such as resistance, electric capacity, amplifier for adopting in circuit is low, therefore total temperature influence amount is little.Additionally, passing through multiple spot control
Temperature stability and temperature gradient explained that two-sided self-balancing framework solves temperature control space are made, temperature is controlled at 35 DEG C ± 0.2 DEG C,
High steady temperature influence amount of the current source under wide temperature use range is set to be about 0.4-1 × 10-6, reduce a magnitude.
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 each end structure schematic diagram of the current source；
Fig. 3 is current source circuit embodiment schematic diagram described in this utility model.
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 high steady current source embodiment schematic diagram.
The high steady current source 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, current source circuit 111；High side current end 15, low level current terminal 18.
The box body is metal structure, and the current source 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 current source circuit 111, temperature control is solved using the two-sided self-balancing framework of multiparty control
The temperature stability and temperature gradient explained in space.Whole temperature control space respectively arrange up and down a temperature control plate (the first temperature control plate,
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.Using copper coin
The temperature control plate can be made to be more uniformly distributed the heat radiation in temperature control space, be conducive to temperature balance control, it is to avoid in large space
Temperature is uneven；Can effective smooth heat sink when temperature lowering curve, reduce temperature fluctuation value, make constant-temperature precision higher.
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.In actual measurement
In, control temperature is at 35 DEG C ± 0.2 DEG C.
The current source circuit also comprising high side current end 15, high-order voltage end 16, extends to the box portion outside.
It is each end structure schematic diagram of the current source such as Fig. 2, the current source circuit is also comprising high side current end 15, low
Position current terminal 18, extends to the box portion outside, concrete mode：High side current, low level electric current are respectively held when extending to box portion outside
Box body and inner thermal insulating layer are penetrated using red copper binding post.Outside is using exhausted when wherein red copper binding post penetrates box body and inner thermal insulating layer
Edge layer is protected, and each binding post 15,18 is dielectrically separated from box body and inner thermal insulating layer.
Fig. 3 is current source circuit embodiment schematic diagram described in this utility model.Further optimize as this utility model
Embodiment, the current source circuit include the voltage reference circuit 31-39 of voltage controlled current source circuit 310 and at least one；It is described
Voltage controlled current source circuit, for Precision reference voltage conversion to be exported into precision current；The voltage reference circuit, for producing
The Precision reference voltage.
Preferably, the voltage reference circuit is multiple；The output voltage of the plurality of voltage reference circuit is parallel with one another,
It is used as the Voltage Reference of voltage controlled current source circuit 310 to reduce the output noise of Voltage Reference, improves its output stability.
It is further preferred that the voltage reference circuit is includedLong-time stability and 1.2 μ VP-PIt is super
Used as core, the core devices have automatic control temperature function to improve the steady in a long-term of chip the reference voltage chip of low noise index
Property.Preferably to ensure acp chip work, the voltage reference circuit comprising Low Drift Temperature precision resistance, polyester film capacitor and
High performance operational amplifier chip.
Resistance, electric capacity, amplifier that the current source circuit is adopted etc., its temperature coefficient is 2-5 × 10-6/ DEG C, usual electromagnetism
The temperature control of Measurement Laboratory requires that relative variation ranges are between ± 1 DEG C, i.e., described current source circuit is in laboratory environments
Temperature influence amount is about 4-10 × 10-6。
It should be noted that with regard to the quantity of the voltage reference circuit, because total output voltage values are multi-channel parallel
The meansigma methodss of voltage reference circuit, output voltage noise for single channel voltage reference output noise divided by N under radical sign (N for parallel connection
The quantity of voltage reference circuit), optimal number is determined according to technical specification and cost control in actual design.For example, an electricity
The output noise of pressure reference circuit is 6 μ V/V, and to the noise of reference output voltage 3 μ V/V are not more than, then N at least takes 4.
Used as Voltage Reference, selected its long-time stability of chip are 2 μ to generally single voltage reference circuit
Noise is 1.2 μ VP-P, the specific embodiment in Fig. 3 include 9 voltage reference circuit 31-39.After the parallel connection of 9 tunnels, Voltage Reference
Noise is reduced to the 1/3 of single voltage reference circuit noise, i.e. 0.4 μ VP-P。
Embodiment disclosed in the utility model, has the advantages that：Output reference voltage is plurality of voltages benchmark
Meansigma methodss, drastically increase the stability of Voltage Reference output voltage, it is ensured that the output stability of voltage-controlled current source.It is logical
Often the temperature control of electromagnetic measurement laboratory requires that relative variation ranges are between ± 1 DEG C, it will affect in the temperature of laboratory environment
Amount is about 4-10 × 10-6.The temperature stability and thermograde in temperature control space are solved by the two-sided self-balancing framework of multiparty control
Problem, control temperature is about steady temperature influence amount of the current source under wide temperature use range of the height at 35 DEG C ± 0.2 DEG C
0.4-1×10-6, reduce a magnitude.
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 high steady current source, 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, current source circuit；
The box body is metal；
First temperature control circuit, the first temperature control plate, the second temperature control circuit, the second temperature control plate, current source circuit are located at the box
Internal portion；
The inner thermal insulating layer is heat-barrier material, positioned at the inner surface of the box body；
First temperature control plate and second temperature control plate are placed in parallel；
The current source 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 high steady current source, it is characterised in that
The current source circuit includes voltage controlled current source circuit and at least one voltage reference circuit；
The voltage controlled current source circuit, for Precision reference voltage conversion to be exported into precision current；
The voltage reference circuit, for producing the Precision reference voltage.
3. as claimed in claim 2 high steady current source, it is characterised in that
The voltage reference circuit is multiple；
The output voltage of the plurality of voltage reference circuit is parallel with one another.
4. as claimed in claim 2 high steady current source, it is characterised in that
The voltage reference circuit is includedLong-time stability and 1.2 μ VP-PUltra-low noise index benchmark
Voltage chips.
5. as claimed in claim 2 high steady current source, it is characterised in that
The voltage reference circuit includes Low Drift Temperature precision resistance, polyester film capacitor and high performance operational amplifier chip.
6. the high steady current source 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 high steady current source 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 high steady current source as described in claim 1-5 any one, it is characterised in that
The current source circuit includes high side current end, low level current terminal, extends to the box portion outside.
9. the high steady current source 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 high steady current source, it is characterised in that the metal is copper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621189761.7U CN206096993U (en) | 2016-10-28 | 2016-10-28 | High steady electric current source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621189761.7U CN206096993U (en) | 2016-10-28 | 2016-10-28 | High steady electric current source |
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| Publication Number | Publication Date |
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| CN206096993U true CN206096993U (en) | 2017-04-12 |
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| CN201621189761.7U Active CN206096993U (en) | 2016-10-28 | 2016-10-28 | High steady electric current source |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106383541A (en) * | 2016-10-28 | 2017-02-08 | 北京无线电计量测试研究所 | High-stability current source |
-
2016
- 2016-10-28 CN CN201621189761.7U patent/CN206096993U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106383541A (en) * | 2016-10-28 | 2017-02-08 | 北京无线电计量测试研究所 | High-stability current source |
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