CN105527473B - A kind of high stability D.C. high-current source - Google Patents
A kind of high stability D.C. high-current source Download PDFInfo
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- CN105527473B CN105527473B CN201510894885.9A CN201510894885A CN105527473B CN 105527473 B CN105527473 B CN 105527473B CN 201510894885 A CN201510894885 A CN 201510894885A CN 105527473 B CN105527473 B CN 105527473B
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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
A kind of D.C. high-current constant-current source, including adjustment pipe, sample circuit, current sampling resistor, reference voltage, amplifier and accessory power supply, load, it is characterized by also including power control modules, it adjusts the tube voltage drop on pipe according to loading condition dynamic regulation, reduces its pressure drop when loading smaller；When load resistance is larger, adjustment pipe operating voltage is incrementally increased.
Description
Technical field
The present invention relates to electricity field of measuring techniques, more particularly to a kind of high stability D.C. high-current constant-current supply.
Background technique
Many fields use DC current source, and have very high requirement, such as satellite to the stability of DC current source
Zero magnetic pilot system, electricity metering etc..The stability of DC current source directly affects pilot system in the test of zero magnetic of satellite
Performance, in the electricity metering process using DC current source, the DC current source stability of application directly affects metric results.
Therefore it is very necessary to develop the high DC current source of stability.General DC current source is when electric current is larger, due to sampling, dissipating
The factors such as heat influence, it is more difficult to reach very high stability and precision, the present invention overcomes disadvantage mentioned above using multiple technologies,
Realize a kind of big power supply of high stability dc.
Summary of the invention
The purpose of the present invention is the present invention according to defect of the existing technology, proposes a kind of high stability D.C. high-current
Constant-current supply improves the output area and stability of constant-current supply, suitable for the calibration field more demanding to current stability.
A kind of D.C. high-current constant-current source, including adjustment pipe, sample circuit, current sampling resistor, reference voltage, amplifier
With accessory power supply, load, it is characterised in that: further include power control module, adjusted on pipe according to loading condition dynamic regulation
Tube voltage drop, load it is smaller when make its pressure drop reduce；When load resistance is larger, adjustment pipe operating voltage is incrementally increased,
In, the power control module includes that current detection section is used to detect the voltage value in load, and by voltage detecting value and
The difference of reference voltage controls amplifier output size, to control linear optical coupling LED current size, and then control line
Property optocoupler output voltage size, and using linear optical coupling output voltage control adjust pipe operating voltage；Wherein, the sample circuit
Circuit structure for High-accuracy direct current high current sample circuit, the D.C. high-current sample circuit is to be wound on three windings
On annular core, the first winding WN, second are two ratio windings around WX group, and winding construction size is identical, the electricity of two windings
Flow it is contrary so that two windings generate flow direction it is opposite；Tertiary winding WD is detection winding.The both ends winding WN difference
It is connected with adjustment pipe and load, the both ends winding WX are connected with sampling resistor, winding Wd connection zero indicator；
Wherein, WNAnd WXMake the Distribution of Magnetic Field of iron core uniform when being powered for two ratio windings, it is fixed according to total current in this way
Rule, as third winding WDWhen middle electric current is zero, i.e., illustrate W when zero indicator nulling in detection windingDMiddle influence electricity kinetic potential,
Illustrate that then magnetic field strength is zero in iron core without alternating flux in iron core, i.e., then has IN WN=IXWX, IN/IX=WX/WN, i.e., two
The ratio of input current is accurately equal to turn ratio.
Further, wherein further include temperature compensation module, be made of temperature detection and voltage control module.
Further, wherein the compensation method of temperature-compensating is a certain to measure reference voltage source with high precision apparatus in advance
The true voltage value of voltage at different temperatures is set, measured value is stored in digitial controller with data mode, to straight
Flow current source in actual work, the actual temperature detected according to temperature compensation module recalls the corresponding acquisition of these data more
For accurate reference voltage value.
Further, wherein power supply circuit is made of rearrangeable switch voltage source, is capable of providing sufficiently large electric current.
Further, wherein power supply circuit part and control and regulation part separate two modules and place, wherein power supply circuit
Module is arranged on controlling to adjust circuit part, and right, carries out air-cooled temperature control to the biggish power pack of calorific value.
Further, wherein reference voltage source uses the voltage source with high cmrr, high stability, preferably
AD541 with 18 resolving powers.
Using D.C. high-current constant-current supply of the invention, maximum output current reaches 300A, the limits of error ± 1
×10-5, stability is better than 5 × 10-6/ h substantially increases the output area and stability of constant-current supply, is suitable for steady to electric current
The higher calibration field of qualitative requirement.
Secondly the solution of the present invention can be avoided the problem of current divider excessive because of electric current fever, have stability high, accurate
Degree is high, the linearity is good, small feature affected by environment, and output stability greatly improved.
Another, the present invention program adjusts the tube voltage drop on pipe by loading condition dynamic regulation, adjusts to reach reduction
Homogeneous tube power consumption and heat dissipation, the purpose for improving working efficiency and the pressure that radiates.
Moreover, the present invention improves the stability of reference voltage source, makes the D.C. high-current source by technique for temperature compensation
Obtain higher stability.
In addition, the tradition present invention is by the power pack in high current source and to control to adjust part separated, to calorific value compared with
Big power pack carries out air-cooled temperature control, and places it in and control to adjust on part, avoids rising hot-fluid by controlling to adjust
Part, therefore voltage reference and Sampling device influence of the power pack fever on part is controlled to adjust is reduced, it can be improved big
The stability of current source.
Detailed description of the invention
Fig. 1 is constant-current source basic principle block diagram；
Fig. 2 is power regulation module circuit diagram
Fig. 3 is second embodiment constant-current source basic principle block diagram；
Fig. 4 is sample circuit circuit diagram；
Fig. 5 is third embodiment constant-current source basic principle block diagram；
Fig. 6 is power supply arrangement side scheme.
Specific embodiment
In order to make those skilled in the art better understand the present invention, the present invention is made with implementation method with reference to the accompanying drawing
It is described in further detail.
Referring to Fig. 1, the structure chart in high stability D.C. high-current of the present invention source, including adjustment pipe, sample circuit, electric current are adopted
The main modulars such as sample resistance, reference voltage, amplifier and accessory power supply, load, power control.It wherein, will by sampling resistor
Output electric current is converted into voltage, is then compared with amplified reference voltage, and the error after comparing is adjusted pipe to defeated
Electric current is adjusted out, finally in setting value and remains unchanged output current regulation.Power control module loads dynamic regulation
Circuit can adjust the tube voltage drop on pipe according to loading condition dynamic regulation, and it is tube voltage drop and output electric current that upper power consumption is managed in adjustment
Product, when load resistance is small (i.e. light load), adjust adjustment pipe operating voltage, make its pressure drop reduce, to reduce
Adjustment pipe power consumption.Conversely, adjustment pipe operating voltage is incrementally increased when load resistance is larger (heavier loads), to meet
Normal work demand.For exporting electric current 300A, when load resistance is 0.01 Ω, setting operating voltage is 4V, is adjusted at this time
Homogeneous tube power consumption is about 300A × (Ω of 4V-300A × 0.01)=300W；When load resistance is 0.02 Ω, setting output voltage is
8V, adjusting pipe power consumption at this time is about 300A × (Ω of 8V-300A × 0.02)=600W.If operating voltage always is 10V, above-mentioned two
Kind situation adjustment pipe power consumption is respectively 2100W and 1200W.It can be realized reduction adjustment pipe power consumption and heat dissipation in this way, improve work
The purpose of efficiency and heat dissipation pressure.The circuit diagram of power regulation module is shown in Fig. 2, current detection section actually detects load
On voltage value, amplifier output size is controlled by voltage detecting value and the difference of reference voltage, to control linear optical coupling hair
Optical diode size of current is adjusted using linear optical coupling output voltage control and is managed to control linear optical coupling output voltage size
Operating voltage Vs。
It is to be adopted on the basis of the embodiment of Fig. 1 using D.C. high-current referring to Fig. 3,4 second embodiment of the invention
Sample circuit module, particular circuit configurations are as follows: three windings are wound on annular core, separately flow into INWN, flow into IXWXAnd
Detection winding WD。WNAnd WXFor two ratio windings, to accomplish that winding construction size is identical in technique, Ying Jinliang makes iron core
Distribution of Magnetic Field is uniform.Electric current INWith IXThe contrary of winding is flowed into, thus the flow direction that they generate is opposite.According to full electricity
Flow lawIf ∑ IW=0, magnetic field strength is zero in iron core, i.e. WDMiddle influence electricity kinetic potential, illustrates iron core
Middle no alternating flux, then have INWN=IXWX, IN/IX=WX/WN, i.e., zero indicator nulling in detection winding, the ratio of two input currents
Accurately it is equal to turn ratio.The characteristics of such sample circuit be iron core work in Zero flux state, balance in iron core without magnetic flux,
Thus WN、WXIn equal influence electricity kinetic potentials, in WN、WXOn voltage drop be only dependent upon the copper resistance of winding, it is best so very little
Proportional error uncertainty is less than 1 × 10-6.When work, INPlace winding WNBoth ends are connected with adjustment pipe and load respectively, IXInstitute
In winding WXBoth ends are connected with sampling resistor.
The material coiling that wherein resistor generally uses temperature coefficient small forms, and calibrated trace to the source determines its magnitude, temperature
It spends stability and is better than 10ppm, it is fully wrapped around using cast aluminum casings around, and use coaxial wire as signal transmssion line, it keeps away
Exempt from the interference that spacing electromagnetic radiation generates it.Structure up-samples circuit and uses separation design, and sampling resistor is placed in cabinet
Except, power supply had both been avoided in this way, interference is generated to current divider when exporting high current, also avoid temperature excessively high in cabinet
Current divider is set to generate temperature drift.
Fig. 5 shows third embodiment of the invention, increases temperature acquisition and voltage control module in circuit.Cause
It is an important factor for influencing DC current source stability and accuracy for benchmark voltage source.High stability DC current source is to benchmark
The performance requirement of voltage source is higher, and since this DC current source maximum current is larger, power consumption is higher, the heat distributed is difficult in time
Discharge, therefore this index of temperature coefficient is particularly critical for the design of reference voltage source.Temperature-compensating makes reference voltage source exist
It is influenced by heat dissipation smaller when changing between constant-current source is unloaded and fully loaded, is a kind of necessary method for 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
The D.C. high-current source obtains higher stability.The method of compensation is a certain to measure reference voltage source with high precision apparatus in advance
The true voltage value of voltage at different temperatures is set, measured value is previously stored in digitial controller with data mode,
It recalls these data in actual work to DC current source and obtains more accurate reference voltage value.Such as housing temperature exists
Reference voltage is set into 1V voltage value at 23 °, true voltage is 1.002V, then in DC current source real work, detection
To housing temperature be 23 ° when, if it is desired to obtain 1V reference voltage value, then reference voltage is set as 0.998V, at this time really
Reference voltage value is 1V.
In addition, inhibiting ratio, reference voltage accuracy is also the master for influencing its performance for reference voltage in addition to temperature coefficient
Want parameter.
Inhibit ratio: with the continuous development of CMOS integrated circuit technology, transistor size constantly reduces, the integrated level of chip
It is continuously improved, includes usually that digital circuit and analog circuit are integrated on same chip by whole system, in numerical model analysis electricity
Lu Zhong, due to the noise meeting interference simulation signal of digital circuits section and the presence of high-frequency noise, it is desirable that reference voltage source energy
It is enough that there is good power supply rejection ability in wider frequency range.This DC constant current power supply maximum output current up to 300A,
Therefore electromagnetic interference caused by is very important, selects the reference voltage source of high cmrr essential.
Reference voltage accuracy: the stability of reference voltage be influence DC constant current power supply stability main factor it
One.As the working standard of whole system, the determining reference of DC constant current power supply output valve size is exactly reference voltage source, if
The not high inevitable electric current output stability of reference voltage source stability is affected, therefore the stability of reference voltage need to be better than direct current
Constant-current source index is many, just can guarantee that it reaches defined technical indicator.
Reference voltage source generally has digital and two kinds analog.It is grasped in the design of this power supply using program control operation or key
Make, therefore selects digital DAC as voltage reference.Compared and type selecting, have selected a kind of temperature coefficient preferably, digit it is higher
AD541 as voltage reference, it has 18 resolving powers, can meet this system needs substantially.
Referring to Fig. 6, power supply arrangement of the present invention is shown.Traditional high current source is laid out using integral type, i.e. power supply
Divide and control and regulation are partially within a cabinet.When complete machine power is larger, inner heat is serious, very using fan refrigeration
Internal temperature control can not must all be stablized to water cooling and uniformly.When more demanding to high current source output stability, temperature
Uniformity and stability it is particularly significant, therefore the present invention by the power pack in high current source and control to adjust part separately put
It sets, air-cooled temperature control is carried out to the biggish power pack of calorific value, and place it in and control to adjust on part, avoid rising hot-fluid
By controlling to adjust part, therefore power pack fever is reduced to the voltage reference and Sampling device shadow for controlling to adjust part
It rings, can be improved the stability in high current source.Power supply circuit in the present invention is made of rearrangeable switch voltage source, the voltage source
Feature is to be capable of providing sufficiently large electric current, i.e. the biggish Switching Power Supply of rated current, in control section such as attached drawing in addition to Vs its
Shown in his part.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.In addition, although using some specific terms in this specification, these terms are only
For convenience of explanation, it does not limit the present invention in any way.
Claims (2)
1. a kind of D.C. high-current constant-current source, including adjustment pipe, sample circuit, current sampling resistor, reference voltage, amplifier,
Accessory power supply and load, it is characterised in that: further include power control module, adjusted on pipe according to loading condition dynamic regulation
Tube voltage drop reduces its pressure drop when loading smaller；When load resistance is larger, adjustment pipe operating voltage is incrementally increased, wherein
The power control module includes that current detection section is used to detect the voltage value in load, and passes through voltage detecting value and benchmark
The poor value control amplifier output size of voltage to control linear optical coupling LED current size, and then controls linear
Optocoupler output voltage size, and pipe operating voltage is adjusted using linear optical coupling output voltage control；Wherein, the sample circuit is
The circuit structure of High-accuracy direct current high current sample circuit, the High-accuracy direct current high current sample circuit is, by three windings
It is wound on annular core, the first winding WN, the second winding WXFor two ratio windings, winding construction size is identical, two windings
Current direction is on the contrary, the flow direction for generating two windings is opposite；Tertiary winding WDFor detection winding；Winding WNBoth ends point
It is not connected with adjustment pipe and load, winding WXBoth ends are connected with current sampling resistor, winding WDConnect zero indicator；
Wherein, WNAnd WXFor two ratio windings, when energization, makes the Distribution of Magnetic Field of iron core uniform, in this way according to circuital law,
As third winding WDWhen middle electric current is zero, i.e., illustrate W when zero indicator nulling in detection windingDMiddle influence electricity kinetic potential, explanation
Without alternating flux in iron core, then magnetic field strength is zero in iron core, i.e., then has IN WN=IXWX, IN/IX=WX/WN, i.e., two inputs
The ratio of electric current is accurately equal to turn ratio.
2. constant-current source according to claim 1, wherein further include temperature compensation module, by temperature detection and voltage control
Molding block composition.
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| CN201510894885.9A CN105527473B (en) | 2015-09-24 | 2015-12-07 | A kind of high stability D.C. high-current source |
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| 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 |
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| CN105527473A CN105527473A (en) | 2016-04-27 |
| CN105527473B true CN105527473B (en) | 2019-03-12 |
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| 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 |
| 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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| JP2674355B2 (en) * | 1991-05-15 | 1997-11-12 | 三菱電機株式会社 | Power element overcurrent protection device |
| KR100418623B1 (en) * | 1998-12-18 | 2004-06-18 | 페어차일드코리아반도체 주식회사 | Switching mode power supply with constant power control circuit |
| CN1412635A (en) * | 2001-10-14 | 2003-04-23 | 王建中 | High-effective automatic compensation voltage-stabilizing power supply |
| CN102244464B (en) * | 2011-07-08 | 2013-09-25 | 西安天照伟成电气有限公司 | Power circuit |
| CN102541139B (en) * | 2012-01-19 | 2013-12-18 | 浙江中控技术股份有限公司 | System and method for outputting of analog quantity current |
| CN203015212U (en) * | 2012-12-18 | 2013-06-19 | 刘珉恺 | Large-dynamic temperature-compensation type high-precision constant-current source circuit device |
| CN104133513B (en) * | 2013-05-03 | 2016-04-27 | 深圳市海洋王照明工程有限公司 | A kind of mu balanced circuit |
| CN203352450U (en) * | 2013-05-10 | 2013-12-18 | 揭阳市天籁高科电子有限公司 | Switch power supply of power amplifier |
| CN103701341A (en) * | 2013-05-26 | 2014-04-02 | 山东蓝孚高能物理技术有限公司 | Voltage following type depth negative feedback constant current source device |
| CN204168114U (en) * | 2014-10-28 | 2015-02-18 | 张家港市华为电子有限公司 | A kind of high power switching power supply |
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