CN105527473A - High-stability DC large current source - Google Patents
High-stability DC large current source Download PDFInfo
- Publication number
- CN105527473A CN105527473A CN201510894885.9A CN201510894885A CN105527473A CN 105527473 A CN105527473 A CN 105527473A CN 201510894885 A CN201510894885 A CN 201510894885A CN 105527473 A CN105527473 A CN 105527473A
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- Prior art keywords
- voltage
- current source
- winding
- constant current
- reference voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
Abstract
The invention provides a DC large current source which comprises a regulation tube, a sampling circuit, a current sampling resistor, a reference voltage, an amplifier, an auxiliary power supply and a load. The DC large current source is characterized by that the DC large current source also comprises a power control module, the tube voltage drop in the regulation tube is adjusted according to a load condition, the voltage drop is reduced when the load is small, and the regulation tube working voltage is gradually increased when the load resistance is large.
Description
Technical field
Technology described in the invention relates in general to a kind of rechargeable battery technology field.
Background technology
Many fields use DC current source, and have very high requirement to the stability of DC current source, such as satellite zero magnetic pilot system, electricity metering etc.In the test of satellite zero magnetic, the degree of stability of DC current source directly affects the performance of pilot system, and in the electricity metering process using DC current source, the DC current source stability of application directly affects metric results.Therefore the DC current source developing degree of stability high is very necessary.General DC current source is when electric current is larger, and due to many factors such as sampling, heat radiations, more difficult very high degree of stability and the precision of reaching, the present invention utilizes multiple technologies to overcome above shortcoming, achieves a kind of high stability dc large power supply.
Summary of the invention
The object of the invention is the defect that the present invention exists according to prior art, propose a kind of high stability D.C. high-current constant-current supply, improve output area and the stability of constant-current supply, be applicable to the calibration field higher to current stability requirement.
Adopt D.C. high-current constant-current supply of the present invention, its maximum output current reaches 300A, the limits of error ± 1 × 10
-5, degree of stability is better than 5 × 10
-6/ h, substantially increases output area and the stability of constant-current supply, is applicable to the calibration field higher to current stability requirement.
Secondly the solution of the present invention can avoid shunt because of the problem of the excessive heating of electric current, has that stability is high, accuracy is high, the linearity is good, little feature affected by environment, significantly improves output stability.
Another, the present invention program by the tube voltage drop on loading condition dynamic adjustments Correctional tube, thus reaches and reduces Correctional tube power consumption and heat radiation, increases work efficiency and the object of the pressure that dispels the heat.
And the present invention, by technique for temperature compensation, improves the stability of reference voltage source, this D.C. high-current source is made to obtain higher stability.
Also have, tradition the present invention by the power pack in big current source and regulating and controlling part separated, the power pack larger to thermal value carries out air-cooled temperature control, and be placed on regulating and controlling part, avoid rising hot-fluid through regulating and controlling part, because this reducing power pack heating to the voltage reference of regulating and controlling part and Sampling device impact, the stability in big current source can be improved.
Accompanying drawing explanation
Fig. 1 is constant current source ultimate principle block diagram;
Fig. 2 is power regulation module circuit diagram
Fig. 3 is the second embodiment constant current source ultimate principle block diagram;
Fig. 4 is sample circuit circuit diagram;
Fig. 5 is the 3rd embodiment constant current source ultimate principle block diagram;
Fig. 6 is the power supply side of layout scheme.
Embodiment
In order to make the art personnel better understand the present invention, below in conjunction with accompanying drawing and implementation method, the present invention is described in further detail.
See Fig. 1, the structural drawing in high stability D.C. high-current source of the present invention, comprises the main modular such as Correctional tube, sample circuit, current sampling resistor, reference voltage, amplifier and accessory power supply, load, power control.Wherein, convert output current to voltage by sampling resistor, then with amplify after reference voltage compare, the error relatively adjusts output current through Correctional tube, finally regulated by output current and remains unchanged in setting value.Power control module, load dynamic adjustments circuit, can according to the tube voltage drop on loading condition dynamic adjustments Correctional tube, on Correctional tube, power consumption is the product of tube voltage drop and output current, when pull-up resistor is less (load is lighter), regulate Correctional tube operating voltage, its pressure drop is reduced, thus reduces Correctional tube power consumption.Otherwise, when pull-up resistor is larger (heavier loads), progressively increase Correctional tube operating voltage, to meet normal work requirements.For output current 300A, when pull-up resistor is 0.01 Ω, arranging operating voltage is 4V, and now Correctional tube power consumption is about 300A × (4V-300A × 0.01 Ω)=300W; When pull-up resistor is 0.02 Ω, arranging output voltage is 8V, and now Correctional tube power consumption is about 300A × (8V-300A × 0.02 Ω)=600W.As operating voltage is 10V always, above-mentioned two situations Correctional tube power consumption is respectively 2100W and 1200W.Can realize reducing Correctional tube power consumption and heat radiation like this, increase work efficiency and the object of the pressure that dispels the heat.The circuit diagram of power regulation module has been shown in Fig. 2, the real magnitude of voltage for detecting in load of current detection section, control amplifier by the difference of voltage detecting value and reference voltage and export size, thus control linear optocoupler LED current size, thus control linear optocoupler output voltage size, utilize linear optical coupling output voltage control Correctional tube operating voltage V
s.
Be have employed D.C. high-current sample circuit module on the embodiment basis of Fig. 1 see Fig. 3,4 second embodiment of the invention, particular circuit configurations is: by three windings around on annular core, flow into I respectively
nw
n, flow into I
xw
xand detect winding W
d.W
nand W
xbe two ratio windings, technique will be accomplished winding construction is measure-alike, the Distribution of Magnetic Field of iron core should be made as far as possible even.Electric current I
nwith I
xthe direction flowing into winding is contrary, and thus their flow direction of generation is contrary.According to circuital law
if ∑ IW=0, then in iron core, magnetic field intensity is zero, i.e. W
dmiddle influence electricity kinetic potential, illustrates without alternating flux in iron core, then has I
nw
n=I
xw
x, I
n/ I
x=W
x/ W
n, namely detect zero indicator nulling on winding, the ratio of two input currents equals turn ratio exactly.The feature of this kind of sample circuit is that iron core is operated in Zero flux state, during balance in iron core without magnetic flux, thus W
n, W
xin equal influence electricity kinetic potentials, at W
n, W
xon voltage drop only depend on winding copper resistance, so very little, its optimal proportion error uncertainty is less than 1 × 10
-6.During work, I
nplace winding W
ntwo ends are connected with load with Correctional tube respectively, I
xplace winding W
xtwo ends are connected with sampling resistor.
The material coiling that wherein resistor generally adopts temperature coefficient little forms, trace to the source through calibration and determine its value, its temperature stability is better than 10ppm, adopts cast aluminum casings to wrap up completely around, and use coaxial wire as signal transmssion line, avoid the interference that spacing electromagnetic radiation produces it.Structure up-sampling circuit adopts separation design, is placed in by sampling resistor outside cabinet, so both avoids power supply and produces interference when exporting big current to shunt, it also avoid temperature too high in cabinet and makes shunt produce temperature drift.
Fig. 5 shows third embodiment of the invention, and it adds temperature acquisition and voltage control module in circuit.Because reference voltage source is the key factor affecting DC current source stability and accuracy.The performance requirement of high stability DC current source to reference voltage source is higher, and because this DC current source maximum current is comparatively large, power consumption is higher, the heat distributed is difficult to timely discharge, and therefore this index of temperature coefficient is particularly crucial for the design of reference voltage source.Temperature compensation affects less by heat radiation when reference voltage source is changed between constant current source is unloaded and fully loaded, be the one necessity method improving reference voltage accuracy.Voltage reference technique for temperature compensation is applied in D.C. high-current source by the present invention, improves the stability of reference voltage source, makes this D.C. high-current source obtain higher stability.The method compensated is that prior high precision apparatus records a certain setting voltage of reference voltage source real magnitude of voltage at different temperatures, measured value is stored in digitial controller in advance with data mode, when DC current source real work, calls the more accurate reference voltage value of these data acquisitions again.Reference voltage is set 1V magnitude of voltage by such as housing temperature 23 ° time, real voltage is 1.002V, then in DC current source real work, when detecting that housing temperature is 23 °, if want to obtain 1V reference voltage value, then reference voltage is set as 0.998V, now real reference voltage value is 1V.
In addition, for reference voltage except temperature coefficient, rejection ratio, reference voltage accuracy are also the major parameters affecting its performance.
Rejection ratio: along with the development of CMOS integrated circuit technology; transistor size constantly reduces; the integrated level of chip improves constantly; usually whole system is comprised digital circuit and mimic channel is integrated on same chip; in Digital Analog Hybrid Circuits; due to the noise meeting interference simulation signal of digital circuits section, and the existence of high frequency noise, require that reference voltage source can have good power supply rejection ability in wider frequency range.This DC constant current power supply maximum output current can reach 300A, and the electromagnetic interference (EMI) therefore caused is very important, selects the reference voltage source of high cmrr essential.
Reference voltage accuracy: the stability of reference voltage is one of main factor affecting DC constant current power supply stability.As the working standard of whole system, the determination reference of DC constant current power supply output valve size be exactly reference voltage source, if the not high inevitable electric current output stability of reference voltage source stability is affected, therefore need to be better than DC constant current power supply index many for the stability of reference voltage, guarantee its reach the technical indicator of regulation.
Reference voltage source generally has digital and analog two kinds.This Power Management Design adopts program control operation or button operation, therefore select digital DAC as voltage reference.Through comparing and type selecting, have selected a kind of temperature coefficient better, the higher AD541 of figure place as voltage reference, it has the resolving power of 18, substantially can meet native system needs.
See Fig. 6, show power supply arrangement of the present invention.Tradition big current source adopts integral type layout, and namely power pack and regulating and controlling part are within a cabinet.When complete machine power is larger, inner heat is serious, adopts fan even water-cooled of freezing all internal temperature control must cannot to be stablized and evenly.When requiring higher to big current source output stability, the homogeneity of temperature and stability are very important, therefore the present invention by the power pack in big current source and regulating and controlling part separated, the power pack larger to thermal value carries out air-cooled temperature control, and be placed on regulating and controlling part, avoiding rising hot-fluid through regulating and controlling part, because this reducing power pack heating to the voltage reference of regulating and controlling part and Sampling device impact, the stability in big current source can be improved.Feed circuit in the present invention are made up of rearrangeable switch voltage source, and the feature of this voltage source to provide enough large electric current, the Switching Power Supply that namely rated current is larger, control section as in accompanying drawing except Vs shown in other parts.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.In addition, although employ some specific terms in this instructions, these terms are only used to convenient explanation, do not form any restriction to the present invention.
Claims (10)
1. a D.C. high-current constant current source, comprise Correctional tube, sample circuit, current sampling resistor, reference voltage, amplifier and accessory power supply, load, it is characterized in that: also comprise power control module, it makes its pressure drop reduce according to the tube voltage drop on loading condition dynamic adjustments Correctional tube when load is less; When pull-up resistor is larger, progressively increase Correctional tube operating voltage.
2. constant current source according to claim 1, wherein, described power control module comprises current detection section for detecting the magnitude of voltage in load, and control amplifier by the difference of voltage detecting value and reference voltage and export size, thus control linear optocoupler LED current size, and then control linear optocoupler output voltage size, and utilize linear optical coupling output voltage control Correctional tube operating voltage.
3. constant current source according to claim 1, wherein, described sample circuit is High-accuracy direct current big current sample circuit.
4. constant current source according to claim 3, wherein, the circuit structure of described D.C. high-current sample circuit is, by three windings around on annular core, first winding WN, second is two ratio windings around WX group, winding construction is measure-alike, and the direction of current of two windings is contrary, and the flow direction that two windings are produced is contrary; Tertiary winding WD is for detecting winding.Winding WN two ends are connected with load with Correctional tube respectively, and winding WX two ends are connected with sampling resistor, and winding Wd connects zero indicator.
5. constant current source according to claim 4, wherein, W
nand W
xmake the Distribution of Magnetic Field of iron core even when being two ratio winding energisings, like this according to circuital law, as the 3rd winding W
dwhen middle electric current is zero, when namely detecting zero indicator nulling on winding, W is described
dmiddle influence electricity kinetic potential, illustrates without alternating flux in iron core, then in iron core, magnetic field intensity is zero, namely then has I
nw
n=I
xw
x, I
n/ I
x=W
x/ W
n, namely the ratio of two input currents equals turn ratio exactly.
6. the constant current source according to claim 1-3, wherein, also comprises temperature compensation module, and it is made up of temperature detection and voltage control module.
7. constant current source according to claim 6, wherein, the compensation method of temperature compensation is record a certain setting voltage of reference voltage source real magnitude of voltage at different temperatures with high precision apparatus in advance, measured value is stored in digitial controller with data mode, when DC current source real work, according to the actual temperature that temperature compensation module detects, then call the more accurate reference voltage value of these data correspondence acquisitions.
8. the constant current source according to claim 1-3, wherein, feed circuit are made up of rearrangeable switch voltage source, and it can provide enough large electric current.
9. constant current source according to claim 8, wherein, feed circuit part and regulating and controlling part are separated two modules and are placed, and wherein feed circuit module installation is on regulating and controlling circuit part, and right, and the power pack larger to thermal value carries out air-cooled temperature control.
10. constant current source according to claim 10, wherein, reference voltage source adopts the voltage source with high cmrr, high stability, preferably has the AD541 of 18 resolving powers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510894885.9A CN105527473B (en) | 2015-09-24 | 2015-12-07 | A kind of high stability D.C. high-current source |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2015106171183 | 2015-09-24 | ||
| CN201510617118 | 2015-09-24 | ||
| CN201510894885.9A CN105527473B (en) | 2015-09-24 | 2015-12-07 | A kind of high stability D.C. high-current source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105527473A true CN105527473A (en) | 2016-04-27 |
| CN105527473B CN105527473B (en) | 2019-03-12 |
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|---|---|---|---|
| CN201510894885.9A Active CN105527473B (en) | 2015-09-24 | 2015-12-07 | A kind of high stability D.C. high-current source |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106230252A (en) * | 2016-10-10 | 2016-12-14 | 哈尔滨龙计测试技术开发公司 | A kind of high-precision high-power DC source |
| CN110687156A (en) * | 2019-10-29 | 2020-01-14 | 华中科技大学 | Variable field nuclear magnetic resonance system and nuclear magnetic resonance signal measuring method |
| CN111313365A (en) * | 2020-03-30 | 2020-06-19 | 福州京东方光电科技有限公司 | Overvoltage protection circuit, overvoltage protection method and display device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106230252A (en) * | 2016-10-10 | 2016-12-14 | 哈尔滨龙计测试技术开发公司 | A kind of high-precision high-power DC source |
| CN106230252B (en) * | 2016-10-10 | 2018-08-31 | 哈尔滨龙计测试技术开发公司 | A kind of high-precision high-power DC power supply |
| CN110687156A (en) * | 2019-10-29 | 2020-01-14 | 华中科技大学 | Variable field nuclear magnetic resonance system and nuclear magnetic resonance signal measuring method |
| CN111313365A (en) * | 2020-03-30 | 2020-06-19 | 福州京东方光电科技有限公司 | Overvoltage protection circuit, overvoltage protection method and display device |
| CN111313365B (en) * | 2020-03-30 | 2022-07-12 | 福州京东方光电科技有限公司 | Overvoltage protection circuit, overvoltage protection method and display device |
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|---|---|
| CN105527473B (en) | 2019-03-12 |
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