CN108508387A - A kind of high-precision current load calibration method and calibration system - Google Patents
A kind of high-precision current load calibration method and calibration system Download PDFInfo
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- CN108508387A CN108508387A CN201810286644.XA CN201810286644A CN108508387A CN 108508387 A CN108508387 A CN 108508387A CN 201810286644 A CN201810286644 A CN 201810286644A CN 108508387 A CN108508387 A CN 108508387A
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- current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
Abstract
The invention discloses a kind of high-precision current loading calibration methods, and this approach includes the following steps：（1）Multiple branch line load circuits are together in parallel successively the first parallel circuit of composition, and a Switching Power Supply in parallel forms the second parallel circuit again in the first parallel circuit；（2）By the electronic load of Switching Power Supply one power variable of series connection of the second parallel circuit, which is connected to the Computer signal of control bearing power variation；（3）Precision current sensor is provided at the initiating terminal of first parallel circuit, which can be transferred to step by the current value of the first parallel circuit（2）In computer, step（2）In the current value that is measured according to current sensor of computer, carry out calculating comparison, then control changes the power of load, and load is made to reach the electric current of needs.The current loading calibration method and calibration system of the present invention makes the very high system of precision, therefore entreprise cost can be greatly reduced using the very low device of cost.
Description
Technical field
The present invention relates to a kind of high-precision current load calibration method and calibration systems, belong to electroporation field.
Background technology
In the testing requirement of some equipment, to give circuit-under-test DUT to apply load, in the course of work of equipment in order to
The precision current value of equipment is flowed through in guarantee, generally requires first to calibrate circuital current, to ensure the consistency of test, including
Before measurement circuit electric current, the current precision of line load is first calibrated before applying electric current to the load in circuit.Traditional school
Quasi- method is directly to connect the larger accurate AC electronic load device of a power in circuit, as shown in Figure 1, including
Communication power supply 1 is tested object DUT2 and exchanges AC electronic load devices 3, the power of this AC electronic load device 3
It is adjustable.But the price of this high power load device is very expensive, one is wanted tens of thousands of members to hundreds of thousands etc., and cost is very high.
Invention content
The invention mainly solves the technical problem of providing a kind of high-precision current load calibration method and calibration systems, lead to
It crosses the current loading calibration method and the very low device and load device of price may be used in calibration system, it equally can be to circuit
Electric current carries out whole real time calibration, and to ensure the precision of test, material cost can thus be greatly reduced.
In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of high-precision current load calibration is provided
Method comprising following steps：
（1）Multiple branch line load circuits are together in parallel successively the first parallel circuit of composition, include in each branch line circuit
One resistance and a branch wiretap, a Switching Power Supply in parallel forms the second parallel circuit again in the first parallel circuit；
（2）By the DC Electronic Loads of Switching Power Supply one power variable of series connection of the second parallel circuit, the load is negative with control
Carry the Computer signal connection of changed power；
（3）It is provided with high precision electric current transducer at the initiating terminal of first parallel circuit, which can obtain first
And second parallel circuit whole current values, the current value of the first parallel circuit is transferred to step（2）In computer, step
Suddenly（2）In the current value that is measured according to current sensor of computer, carry out calculating comparison, then control changes electronic load
Power makes overall load reach the current value of needs, that is, completes the correcting current system of load.
The present invention also provides a kind of calibration system for above-mentioned current loading calibration method, including multiple branch line circuits,
The multiple branch line circuit is together in parallel successively forms the first parallel circuit, includes that there are one electricity in each branch line circuit
Resistance and a branch wiretap, in parallel in first parallel circuit there are one Switching Power Supply, first parallel circuit and switches
Power supply forms the second parallel circuit, and the Switching Power Supply and the electronic load of a power variable are connected in series with, the load and one
The Computer signal communication of bearing power variation is controlled, current sensor is provided at the initiating terminal of first parallel circuit,
The initiating terminal of first parallel circuit is connected to a tested object DUT, and the current sensor is connected to the computer.
Preferably, the digital quantity for metering current value is provided in the circuit between the current sensor and computer
Ammeter, the number electrometer are connected to the current sensor and computer simultaneously.
Preferably, the Switching Power Supply is that alternating current can be converted to the supply unit of direct current, the electronic load
For DC Electronic Loads.
The beneficial effects of the invention are as follows：It is very low that price may be used in the current loading calibration method and calibration system of the present invention
Do not need precision very high device and load device, circuital current can equally be calibrated, material cost is greatly reduced,
And the calibration accuracy of electric current is high, and applicable current range is big.
Description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing, wherein：
Fig. 1 is current loading calibration system schematic diagram in the prior art；
Fig. 2 is the current loading calibration system schematic diagram of the present invention.
The label of each component is as follows in attached drawing：1, power supply, 2, tested object DUT, 3, AC electronic load devices, 4,
Digital electrometer, 5, computer, 6, current sensor, 7, branch line circuit, 8, branch wiretap, 9, first switch, 10, switch electricity
Source, 11, electronic load, 12, resistance, the 100, first parallel circuit, the 200, second parallel circuit.
Specific implementation mode
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
All other embodiment that technical staff is obtained without making creative work belongs to the model that the present invention protects
It encloses.
Referring to Fig. 2, the embodiment of the present invention includes：A kind of high-precision current load calibration method comprising following steps：
（1）Multiple branch line circuits 7 are together in parallel successively the first parallel circuit 100 of composition, include in multiple branch line circuits 7
One power-type resistance 12 and branch wiretap 8, branch wiretap 8 is formula control switch, in parallel again in the first parallel circuit 100
One Switching Power Supply 10 forms the second parallel circuit 200；
（2）By the DC Electronic Loads 11 of the one power continuous variable of series connection of Switching Power Supply 10 of the second parallel circuit 200, the electricity
5 signal communication of computer of son load 11 and control bearing power variation；
（3）It is provided with precision current sensor 6 at the initiating terminal of first parallel circuit 100, which can obtain
The current value of one parallel circuit 100 is transferred to step by the current value of the first parallel circuit 100 through digital electrometer 4（2）
In computer 5, step（2）In the current value that is measured according to the digital electrometer of current sensor 6/ 4 of computer, with setting
Current value carries out calculating comparison, and then control changes the power of electronic load 11, so that electronic load 11 is reached the electric current of needs, i.e.,
Complete the correcting current of electronic load 11.
Referring to Fig. 2, the embodiment of the invention also includes：A kind of current loading calibration system, including multiple branch line circuits 7,
The multiple branch line circuit 7 is together in parallel successively forms the first parallel circuit 100, includes in each branch line circuit 7
One resistance 12.It is in parallel there are one Switching Power Supply 10 in first parallel circuit 100, first parallel circuit 100 with open
Powered-down source 10 forms the second parallel circuit 200, and the Switching Power Supply 10 and the load 11 of a power variable are connected in series with, this is negative
It carries 11 and one and controls 5 signal communication of computer of 11 changed power of electronic load.At the initiating terminal of first parallel circuit 100
It is provided with current sensor 6, the initiating terminal of first parallel circuit 100 and a power supply 1 and tested object DUT2 connects
It is logical, the current sensor 6 and 5 signal communication of the computer.
Preferably, the precision for metering current value is provided in the circuit between the current sensor 6 and computer 5
Digital electrometer 4.Digital electrometer 4 can read the current value in the first parallel circuit 100, and can be transferred to current value
Computer 5.
Preferably, the Switching Power Supply 10 is that alternating current can be converted to the supply unit of direct current, the Electronic Negative
It is DC load to carry 11.The power and electric current Adjustment precision of DC load are high.
When work, current value as needed has determined that several branch line circuits 7 are connected, insufficient electric current can with by electronics
The electric current supplement of load 11.Such as each the conducting electric current of branch line circuit 7 is 1 ampere, the rated power of electronic load 11 is
300 watts, then the rated current of electronic load 11 is 0 to 300/220=1.36 amperes under 220V voltages.What if circuit needed
Electric current is 6.5 amperes, then can close the conducting of 9,6 branch line circuits 7 of branch wiretap 8 and first switch of 6 branch line circuits 7
Total electric current is about 6 amperes, and electronic load sets 0.5 ampere.Current sensor 6 and digital electrometer 4 measure about 6.5 peaces
The current value of left and right is trained, and the current value is transferred to computer 5.Computer 5 calculates the electric current actually measured and 6.5 amperes
The difference of setting, this difference are exactly the summation of entire load system error.After computer 5 calculates, control changes electronic load
11 power output makes the electric current of total circuit reach 6.5 amperes of setting.
It accurate calibration circuital current, electric current can be passed in real time by this high-precision current load calibration method and calibration system
The current value for the circuit that sensor 6 and digital electrometer 4 can measure in real time, then passes through the power output of change electronic load 11
Carry out correcting current.
The conducting electric current of electronic load 11 can change between 0-1.36 amperes, and the range of electric current adjustment is greatly to each electricity
The difference of 1 ampere of electric current is hindered, therefore any current value of 0-N*1A+1.36A can be set, wherein N is the number of resistance, example
If any 20 resistance branch, so that it may which the load current to adjust any 0-21.36A exports.
Since resistance 12 and Switching Power Supply 10 and the price of electronic load 11 are all very low, electronic load 11 is as fine tuning electricity
The effect of stream, power need not be very big, and relative price is cheap, and existing equipment may be used in computer 5.So entire electric current
The hardware cost of calibration system can decline to a great extent, and probably be only equivalent to 1/10th using high power load, it is possible to
The competitiveness for greatly improving device current test enterprise, reduces the calibration cost of electric current.And use DC load, it is ensured that
The control accuracy of electric current keeps the testing current of circuit and calibration accurate.Compared to traditional current loading calibration method and calibration
System, current loading real-time calibration method of the invention and calibration system have very big cost advantage and accuracy benefits.
Example the above is only the implementation of the present invention is not intended to limit the scope of the invention, every to utilize this hair
Equivalent structure or equivalent flow shift made by bright description is applied directly or indirectly in other relevant technology necks
Domain is included within the scope of the present invention.
Claims (4)
1. a kind of high-precision current load calibration method, which is characterized in that include the following steps：
（1）Multiple branch line load circuits are together in parallel successively the first parallel circuit of composition, include in each branch line circuit
One resistance and a branch wiretap, a Switching Power Supply in parallel forms the second parallel circuit again in the first parallel circuit；
（2）By the DC Electronic Loads of Switching Power Supply one power variable of series connection of the second parallel circuit, the load is negative with control
Carry the Computer signal connection of changed power；
（3）It is provided with high precision electric current transducer at the initiating terminal of first parallel circuit, which can obtain first
And second parallel circuit whole current values, the current value of the first parallel circuit is transferred to step（2）In computer, step
Suddenly（2）In the current value that is measured according to current sensor of computer, carry out calculating comparison, then control changes electronic load
Power makes overall load reach the current value of needs, that is, completes the correcting current system of load.
2. a kind of correcting current system in current loading calibration method as described in claim 1, which is characterized in that packet
Multiple branch line circuits are included, the multiple branch line circuit is together in parallel successively forms the first parallel circuit, each branch line circuit
In include there are one resistance and a branch wiretap, it is in parallel there are one Switching Power Supply in first parallel circuit, described the
One parallel circuit forms the second parallel circuit with Switching Power Supply, and the Switching Power Supply is connected with the electronic load of a power variable
The Computer signal of connection, the load and a control bearing power variation communicates, and is set at the initiating terminal of first parallel circuit
Be equipped with current sensor, the initiating terminal of first parallel circuit is connected to a tested object DUT, the current sensor with
The computer connection.
3. correcting current system according to claim 2, which is characterized in that between the current sensor and computer
Be provided with the digital electrometer for metering current value in circuit, the number electrometer simultaneously with the current sensor and meter
Calculation machine is connected to.
4. correcting current system according to claim 2 or 3, which is characterized in that the Switching Power Supply is to turn alternating current
It is changed to the supply unit of direct current, the electronic load is DC Electronic Loads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810286644.XA CN108508387A (en) | 2018-04-03 | 2018-04-03 | A kind of high-precision current load calibration method and calibration system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810286644.XA CN108508387A (en) | 2018-04-03 | 2018-04-03 | A kind of high-precision current load calibration method and calibration system |
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| CN108508387A true CN108508387A (en) | 2018-09-07 |
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| CN201810286644.XA Pending CN108508387A (en) | 2018-04-03 | 2018-04-03 | A kind of high-precision current load calibration method and calibration system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109975737A (en) * | 2019-03-05 | 2019-07-05 | 国网浙江省电力有限公司电力科学研究院 | Direct current calibrating installation based on the high steady power source of measuring resistance method adjustment |
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| CN2687674Y (en) * | 2004-03-11 | 2005-03-23 | 华为技术有限公司 | High power adjustable electronic load |
| CN201797325U (en) * | 2010-09-21 | 2011-04-13 | 中国电子科技集团公司第十四研究所 | Multi-input parallel feedback energy-saving electronic load |
| CN201853157U (en) * | 2010-11-18 | 2011-06-01 | 杭州高特数码技术有限公司 | Program-controlled DC (direct current) load discharging circuit |
| CN102411103A (en) * | 2011-08-03 | 2012-04-11 | 于利红 | Calibration method for dynamic load mode parameter of direct-current electronic load |
| CN103364752A (en) * | 2013-07-19 | 2013-10-23 | 中国电子科技集团公司第十三研究所 | Field calibration method of on-wafer load traction measurement system |
| CN105119594A (en) * | 2015-07-30 | 2015-12-02 | 中国电子科技集团公司第五十八研究所 | High-speed serial port load automatic calibration circuit |
| CN106501745A (en) * | 2016-12-30 | 2017-03-15 | 深圳市盛弘电气股份有限公司 | A kind of self-checking device and calibration steps |
| CN206757445U (en) * | 2017-06-06 | 2017-12-15 | 江苏瑞峰自动化系统有限公司 | A kind of compensation programmable low-voltage, high-current DC constant current power supply of electronic load |
| CN107528298A (en) * | 2017-09-11 | 2017-12-29 | 深圳传音制造有限公司 | The protection circuit and electronic load of electronic load |
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2018
- 2018-04-03 CN CN201810286644.XA patent/CN108508387A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2687674Y (en) * | 2004-03-11 | 2005-03-23 | 华为技术有限公司 | High power adjustable electronic load |
| CN201797325U (en) * | 2010-09-21 | 2011-04-13 | 中国电子科技集团公司第十四研究所 | Multi-input parallel feedback energy-saving electronic load |
| CN201853157U (en) * | 2010-11-18 | 2011-06-01 | 杭州高特数码技术有限公司 | Program-controlled DC (direct current) load discharging circuit |
| CN102411103A (en) * | 2011-08-03 | 2012-04-11 | 于利红 | Calibration method for dynamic load mode parameter of direct-current electronic load |
| CN103364752A (en) * | 2013-07-19 | 2013-10-23 | 中国电子科技集团公司第十三研究所 | Field calibration method of on-wafer load traction measurement system |
| CN105119594A (en) * | 2015-07-30 | 2015-12-02 | 中国电子科技集团公司第五十八研究所 | High-speed serial port load automatic calibration circuit |
| CN106501745A (en) * | 2016-12-30 | 2017-03-15 | 深圳市盛弘电气股份有限公司 | A kind of self-checking device and calibration steps |
| CN206757445U (en) * | 2017-06-06 | 2017-12-15 | 江苏瑞峰自动化系统有限公司 | A kind of compensation programmable low-voltage, high-current DC constant current power supply of electronic load |
| CN107528298A (en) * | 2017-09-11 | 2017-12-29 | 深圳传音制造有限公司 | The protection circuit and electronic load of electronic load |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109975737A (en) * | 2019-03-05 | 2019-07-05 | 国网浙江省电力有限公司电力科学研究院 | Direct current calibrating installation based on the high steady power source of measuring resistance method adjustment |
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Application publication date: 20180907 |