CN106383541A - High-stability current source - Google Patents
High-stability current source Download PDFInfo
- Publication number
- CN106383541A CN106383541A CN201610965791.0A CN201610965791A CN106383541A CN 106383541 A CN106383541 A CN 106383541A CN 201610965791 A CN201610965791 A CN 201610965791A CN 106383541 A CN106383541 A CN 106383541A
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- Prior art keywords
- temperature control
- current source
- circuit
- control plate
- voltage
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/567—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for temperature compensation
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
The invention discloses a high-stability current source, which comprises a box body, an inner heat insulation layer, a first temperature control circuit, a first temperature control board, a second temperature control circuit, a second temperature control board and a current source circuit, wherein the box body is made of metal; the first temperature control circuit, the first temperature control board, the second temperature control circuit, the second temperature control board and a shunting resistor are positioned inside the box body; the first temperature control board and the second temperature control board are parallel; the current source circuit is positioned between the first temperature control board and the second temperature control board; the first temperature control circuit and the second temperature control circuit are respectively positioned on the first temperature control board and the second temperature control board. The current source circuit further comprises a voltage reference circuit and a voltage-controlled current source circuit. The high-stability current source has the advantages that the influence of environment temperature on the high-stability current source is reduced; the measuring precision is improved.
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, that is, adopt digital electronic ammeter straight
Connect its output current of measurement to be 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 DC voltage using the indirect method of measurement, then again essence is carried out to DC voltage
Close measurement, the high steady current source precision diverter highest accuracy 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 to calibrate
Precision, and current source also can be affected by the ambient temperature.These measuring methods cannot meet some superhigh precision electric installations
(for example a kind of inertial navigation accelerometer simulator, its technical specification is up to ± 0.0005% in 5 μ A～50mA)
Alignment requirements.Output stability due to current source can be affected by the ambient temperature, how to eliminate or less ambient temperature shadow
Ring, improve the output stability of current source, be a problem needing to solve.
Content of the invention
It is an object of the invention to provide a kind of high steady current source, solution estimated current source temperature influence, output are stable
Property not enough problem.
A kind of high steady current source embodiment disclosed by the invention, including box body, internal layer, the first temperature control circuit, the first temperature control
Plate, the second temperature control circuit, the second temperature control plate, current source circuit；Described box body is metal；Described 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 described tray interior；Described internal layer is located at described box body
Inner surface；Described internal layer is heat-barrier material；Described first temperature control plate and described second temperature control plate are placed in parallel；Described current source
Circuit is located between described first temperature control plate and the second temperature control plate；Described first temperature control circuit is located on described first temperature control plate；
Described second temperature control circuit is located on described second temperature control plate.
Usually, described current source circuit also comprises high side current end, low level current terminal, extends to described box portion outside.
The embodiment optimizing further as the present invention, described current source circuit comprises voltage controlled current source circuit and at least one
Individual voltage reference circuit；Described voltage controlled current source circuit, for becoming precision current to export Precision reference voltage conversion；Described electricity
Pressure reference circuit, for producing described Precision reference voltage.
Preferably, described 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 described voltage reference circuit comprises 2 μLong-time stability and 1.2 μ VP-PSuper
The reference voltage chip of low noise index.Described voltage reference circuit comprises Low Drift Temperature precision resistance, polyester film capacitor and height
Performance operational amplifier chip.
As highly preferred embodiment of the present invention, described first temperature control circuit and described second temperature control circuit are bridge-type temperature control electricity
Road.Described first temperature control circuit is identical with the circuit parameter of described second temperature control circuit；Described first temperature control circuit and described
The temperature control value of two temperature control circuits is identical.
As highly preferred embodiment of the present invention, described first temperature control plate and described second temperature control plate are by the high metal of thermal conductivity
Make, for example copper.
At least one technical scheme above-mentioned that the embodiment of the present application adopts can reach following beneficial effect：Generally single electricity
As Voltage Reference, after multi-channel parallel, the noise of Voltage Reference reduces pressure reference circuit, and output reference voltage is that plurality of voltages is defeated
The meansigma methodss going out, drastically increase the stability of Voltage Reference output voltage it is ensured that the output stability of voltage-controlled current source.
In circuit, its temperature coefficient such as the resistance of employing, electric capacity, amplifier is low, and therefore total temperature influence amount is little.Additionally, passing through multiple spot control
Make temperature stability and the temperature gradient explained that two-sided self-balancing framework solves temperature control space, control temperature at 35 DEG C ± 0.2 DEG C,
High steady temperature influence amount under wide temperature range for the current source is made to be about 0.4-1 × 10-6, reduce a magnitude.
Brief description
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 is used for explaining the application, does not constitute the improper restriction to the application.In the accompanying drawings：
Fig. 1 is a kind of embodiment schematic diagram of the present invention；
Fig. 2 is described current source each end structure schematic diagram；
Fig. 3 is heretofore described current source circuit embodiment schematic diagram.
Specific embodiment
Purpose, technical scheme and advantage for making the application are 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 whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not doing
The every other embodiment being obtained under the premise of going out creative work, broadly falls into the scope of the application protection.
Fig. 1 is a kind of high steady current source embodiment schematic diagram.
Described 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.
Described box body is metal structure, carries out electromagnetic shielding to described current source circuit, 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 described current source circuit 111, temperature control is solved using multiparty control two-sided self-balancing framework
The temperature stability in space and temperature gradient explained.Whole temperature control space up and down respectively one temperature control plate of setting (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 all energy constant temperature is in same value.Using copper coin
Can make described temperature control plate that the heat radiation in temperature control space is more uniformly distributed, 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.
Described 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 high, make the temperature control in whole plane be easier to reach balance, and each bridge-type temperature-adjusting circuit be using 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 at 35 DEG C ± 0.2 DEG C.
Described current source circuit also comprises high side current end 15, high-order voltage end 16, extends to described box portion outside.
As Fig. 2, it is described current source each end structure schematic diagram, described current source circuit also comprises high side current end 15, low
Position current terminal 18, extends to described box portion outside, concrete mode：When each end of high side current, low level electric current extends to box portion outside
Box body and inner thermal insulating layer are penetrated using red copper binding post.Wherein red copper binding post penetrates outside when box body and inner thermal insulating layer employing absolutely
Edge layer is protected, and each binding post 15,18 is dielectrically separated from box body and inner thermal insulating layer.
Fig. 3 is heretofore described current source circuit embodiment schematic diagram.The embodiment optimizing further as the present invention,
Described current source circuit comprises voltage controlled current source circuit 310 and at least one voltage reference circuit 31-39；Described voltage-controlled current source
Circuit, for becoming precision current to export Precision reference voltage conversion；Described voltage reference circuit, for producing described accurate ginseng
Examine voltage.
Preferably, described 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, improve its output stability.
It is further preferred that described voltage reference circuit comprises 2 μLong-time stability and 1.2 μ VP-PUltralow
As core, this core devices has automatic control temperature function to improve the steady in a long-term of chip to the reference voltage chip of noise objective
Property.Ensure acp chip work for more preferable, described voltage reference circuit comprise Low Drift Temperature precision resistance, polyester film capacitor and
High performance operational amplifier chip.
The resistance of described current source circuit employing, electric capacity, amplifier etc., its temperature coefficient is 2-5 × 10-6/ DEG C, generally electricity
Between the temperature control of magnetic Measurement Laboratory requires relative variation ranges to be ± 1 DEG C, that is, described current source circuit is in laboratory environments
Temperature influence amount be about 4-10 × 10-6.
It should be noted that with regard to the quantity of described voltage reference circuit, because total output voltage values are multi-channel parallel
The meansigma methodss of voltage reference circuit, output voltage noise be single channel voltage reference output noise divided by N under radical sign (N be parallel connection
The quantity of voltage reference circuit), in actual design, optimal number is determined according to technical specification and cost control.For example, an electricity
The output noise of pressure reference circuit is 6 μ V/V, and the noise to reference output voltage is not more than 3 μ V/V, then N is minimum takes 4.
As Voltage Reference, make its long-time stability from chip is 2 μ to generally single voltage reference circuitMake an uproar
Sound is 1.2 μ VP-P, the specific embodiment in Fig. 3 comprises 9 voltage reference circuit 31-39.After 9 tunnels parallel connections, the making an uproar of Voltage Reference
Sound is reduced to the 1/3 of single voltage reference circuit noise, i.e. 0.4 μ VP-P.
Disclosed embodiment of this invention, has the advantages that：Output reference voltage is the flat of plurality of voltages benchmark
Average, drastically increases the stability of Voltage Reference output voltage it is ensured that the output stability of voltage-controlled current source.Generally electricity
Between the temperature control of magnetic Measurement Laboratory requires relative variation ranges to be ± 1 DEG C, it will laboratory environment temperature influence amount about
For 4-10 × 10-6.Solve temperature stability and the temperature gradient explained in temperature control space by multiparty control two-sided self-balancing framework,
Control temperature at 35 DEG C ± 0.2 DEG C, make the steady temperature influence amount under wide temperature range for the current source of this height about 0.4-1 ×
10-6, reduce a magnitude.
Also, it should be noted term " inclusion ", "comprising" or its any other variant are intended to nonexcludability
Comprising, so that including a series of process of key elements, method, commodity or equipment not only include those key elements, but also wrapping
Include other key elements being not expressly set out, or also include for this process, method, commodity or intrinsic the wanting of equipment
Element.In the absence of more restrictions, the key element being limited by sentence "including a ..." is it is not excluded that including described wanting
Also there is other identical element in the process of element, method, commodity or equipment.
The foregoing is only embodiments herein, be not limited to the application.For those skilled in the art
For, the application can have various modifications and variations.All any modifications made within spirit herein and principle, equivalent
Replace, improve etc., within the scope of should be included in claims hereof.
Claims (10)
1. a kind of high steady current source is 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；
Described box body is metal；
Described 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 described box
Internal portion；
Described inner thermal insulating layer is heat-barrier material, positioned at the inner surface of described box body；
Described first temperature control plate and described second temperature control plate are placed in parallel；
Described current source circuit is located between described first temperature control plate and the second temperature control plate；
Described first temperature control circuit is located on described first temperature control plate；
Described second temperature control circuit is located on described second temperature control plate.
2. high steady current source as claimed in claim 1 it is characterised in that
Described current source circuit comprises voltage controlled current source circuit and at least one voltage reference circuit；
Described voltage controlled current source circuit, for becoming precision current to export Precision reference voltage conversion；
Described voltage reference circuit, for producing described Precision reference voltage.
3. high steady current source as claimed in claim 2 it is characterised in that
Described voltage reference circuit is multiple；
The output voltage of the plurality of voltage reference circuit is parallel with one another.
4. high steady current source as claimed in claim 2 it is characterised in that
Described voltage reference circuit comprisesLong-time stability and 1.2 μ VP-PUltra-low noise index benchmark
Voltage chips.
5. high steady current source as claimed in claim 2 it is characterised in that
Described voltage reference circuit comprises Low Drift Temperature precision resistance, polyester film capacitor and high performance operational amplifier chip.
6. as described in claim 1-5 any one high steady current source it is characterised in that described first temperature control circuit and described the
Two temperature control circuits are bridge-type temperature control circuit.
7. as described in claim 1-5 any one high steady current source it is characterised in that
Described first temperature control circuit is identical with the circuit parameter of described second temperature control circuit；
Described first temperature control circuit is identical with the temperature control of described second temperature control circuit value.
8. as described in claim 1-5 any one high steady current source it is characterised in that
Described current source circuit comprises high side current end, low level current terminal, extends to described box portion outside.
9. as described in claim 1-5 any one high steady current source it is characterised in that described first temperature control plate and described second
Temperature control plate is made up of the high metal of thermal conductivity.
10. high steady current source as claimed in claim 9 is it is characterised in that described metal is copper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610965791.0A CN106383541A (en) | 2016-10-28 | 2016-10-28 | High-stability current source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610965791.0A CN106383541A (en) | 2016-10-28 | 2016-10-28 | High-stability current source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106383541A true CN106383541A (en) | 2017-02-08 |
Family
ID=57957382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610965791.0A Pending CN106383541A (en) | 2016-10-28 | 2016-10-28 | High-stability current source |
Country Status (1)
| Country | Link |
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| CN (1) | CN106383541A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110739937A (en) * | 2019-10-22 | 2020-01-31 | 华中科技大学 | switch type square wave generator using parallel reference voltage source |
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| CN101295184A (en) * | 2007-04-25 | 2008-10-29 | 泰艺电子股份有限公司 | Integrated circuit with temperature control function, temperature-controlled heating circuit and constant temperature retaining device |
| CN102082314A (en) * | 2009-11-26 | 2011-06-01 | 中国移动通信集团甘肃有限公司 | Device and system for controlling temperature of storage battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110739937A (en) * | 2019-10-22 | 2020-01-31 | 华中科技大学 | switch type square wave generator using parallel reference voltage source |
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Application publication date: 20170208 |
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