CN107976568A - A kind of current measuring method and its system - Google Patents
A kind of current measuring method and its system Download PDFInfo
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- CN107976568A CN107976568A CN201610924341.7A CN201610924341A CN107976568A CN 107976568 A CN107976568 A CN 107976568A CN 201610924341 A CN201610924341 A CN 201610924341A CN 107976568 A CN107976568 A CN 107976568A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
A kind of current measuring method and its system, this method is by an adjustable constant current source in parallel and a voltage measurement module in a circuit to be measured, the impedance of the voltage measurement module is much larger than the impedance of the circuit to be measured, then utilize adjustable constant current source gradation test electric current different to the line feed current value to be measured, each test electric current is obtained into the voltage signal of the circuit to be measured by the voltage measurement module, calculate the current change quantity between a voltage variety and those test electric currents, the impedance of the circuit to be measured is calculated according to the voltage variety and the current change quantity, hereafter change and supply electric power with the power supply source in the affiliated circuit of circuit to be measured, voltage signal by measurement part is obtained by the voltage measurement module, electric current is calculated according to the impedance of the voltage signal and the circuit to be measured.
Description
Technical field
The present invention relates to a kind of current measuring method and its system, espespecially one kind be able to parallel way to a circuit to be measured into
The method and system of row current measurement.
Background technology
The prior art when part circuit progress current measurement to a circuit is intended to, open by the portion of lines that need to be first intended to measurement
Avometer, is serially connected with the part of the open circuit by road, after treating current measurement, then reduces the part of open circuit.So
Embodiment, though can reach the purpose of measurement electric current, previous operations caused by this embodiment and reduction operation are excessively numerous
It is trivial, and be unfavorable for quickly measuring.However, avometer is serially connected with circuit, avometer in itself possessed impedance by shadow
The overall impedance characteristic of the circuit is rung, and makes measurement result distortion.
Furthermore in addition to the above embodiment, also there is the embodiment measured with hook table, but hook table is only applicable to survey
Amount stream has on high-current circuit, and can not be effective for the measurement of low current circuit, and since hook table needs hooking in electricity to be detected
Lu Shang, makes it be not used to the circuit laid on circuit board.
The content of the invention
The main object of the present invention, the problem that being to solve existing current measurement.
In order to achieve the above object, the present invention provides a kind of current measuring method, have comprising step：
Step 1：One test electric current input point, a first voltage are defined according to the current direction of a circuit to be measured successively
Test point, a second voltage test point and a test electric current output point；
Step 2：An adjustable constant current source and a voltage measurement module in parallel are in the circuit to be measured, the voltage measurement module
Impedance be much larger than the impedance of the circuit to be measured, this is adjustable constant current source the is electrically connected test electric current input point and test electricity
Stream output point is simultaneously formed into a loop, which is then electrically connected the first voltage test point and the second voltage test point
And it is formed into a loop；
Step 3：Using adjustable constant current source gradation test electric current different to the line feed current value to be measured, lead to
When crossing the voltage measurement module and measuring each test electric current and enter the circuit to be measured, the first voltage test point and second voltage
Voltage signal between test point；
Step 4：The first voltage test point and the second voltage test point are calculated when the different wherein one test electric currents
A voltage variety, and the current change quantity between those test electric currents becomes according to the voltage variety and the electric current
Change the impedance that gauge calculates the circuit to be measured；
Step 5：The forbidden energy adjustable constant current source, is changed and is supplied with the power supply source in the affiliated circuit of circuit to be measured
Electric power；And
Step 6：The electricity between the first voltage test point and second voltage test point is obtained using the voltage measurement module
Signal is pressed, the electric current of the circuit to be measured is calculated according to the impedometer of the voltage signal and the circuit to be measured.
In an embodiment, which further includes a sub-step：The line broken circuit to be measured is made to be detected in the first voltage
Between point and the second voltage test point, the voltage letter between the first voltage test point and second voltage detection is obtained
Number, there is provided the voltage signal gives a phase current rectifying and wave filtering circuit, to obtain the impedance operator included in the voltage signal.
In an embodiment, which further includes a sub-step：Selected according to the supply of electric power source category with a low pass
Filter unit or a high pass filter unit handle the voltage signal, if the power supply source for DC power supply with the low pass
Filter unit handles the voltage signal, if the power supply source handles voltage letter for AC power with the high pass filter unit
Number.
In addition to the above-mentioned electric current detecting method, the present invention one current measurement system is also provided, it includes two current probes,
Two voltages perceive probe, an adjustable constant current source, a voltage measurement module and an arithmetic element.Two current probe simultaneously couples
Touch a circuit to be measured and one test electric current input point and a test electric current output point defined by contact position in the circuit to be measured,
Two voltage perceives the probe parallel contact circuit to be measured and defines first voltage inspection by contact position in the circuit to be measured
Measuring point and a second voltage test point, the first voltage test point are located at the test electric current input point with the second voltage test point
And between the test electric current output point.This is adjustable, and constant current source connects the test electric current input point and the test electric current output point,
There is provided multiple current values different test in the circuit to be measured by several times through the test electric current input point and the test electric current output point
Electric current.The voltage measurement module connects the first voltage test point and the second voltage test point, obtains first voltage detection
Each voltage signal between point and the second voltage test point in the different test electric currents.It is adjustable that the arithmetic element connects this
Constant current source and the voltage measurement module, obtain each test electric current and each voltage and calculate a current change quantity and
One voltage variety, calculates the impedance of the circuit to be measured according to the current change quantity and the voltage variety, this is adjustable for forbidden energy
Constant current source make the voltage measurement unit obtain the circuit to be measured by its affiliated circuit a power supply source provide electric power when
The voltage signal, the electric current of the circuit to be measured is calculated by the impedometer of the voltage signal and the circuit to be measured.
In an embodiment, which further includes one should positioned at wherein the one of the corresponding test electric current input point
The first high voltage protection module between current probe and the adjustable constant current source, and one positioned at the corresponding first voltage test point
Wherein one voltage perceive the second high voltage protection module between probe and the voltage measurement module.
In an embodiment, which includes the high resistant antidamping that a pair of voltage signal carries out energy attenuation
Unit.
In an embodiment, which includes a filter module for connecting the high impedance attenuation units, the filter
Ripple module is controlled and root comprising a low-pass filter unit, a high pass filter unit, an all-pass unit and one by the arithmetic element
Selected according to the supply of electric power source category with one of the low-pass filter unit, the high pass filter unit and all-pass unit place
Manage the switching switch of the voltage signal.
In an embodiment, which includes one and connects between the high impedance attenuation units and the filter module
Signal buffer unit.
In an embodiment, which includes the connection filter module and must parse the voltage signal and be wrapped
Phase current rectifying and wave filtering circuit containing impedance operator.
In an embodiment, which is arranged at the filter module and the phase current rectifying and wave filtering circuit comprising one
Between signal amplification circuit.
In an embodiment, which includes a digital simulation for being arranged on the phase current rectifying and wave filtering circuit prime
Conversion circuit, and one be arranged on the phase current rectifying and wave filtering circuit rear class analog-to-digital conversion circuit.
Through the above technical solutions, had the characteristics that compared to the prior art：The present invention measures this with parallel way and treats
The electric current on survey line road, the error of current measurement result can more be reduced by measuring electric current in a series arrangement compared to the prior art.Into one
For step, the impedance for the voltage measurement module that present invention order is parallel to the circuit to be measured is much larger than the circuit to be measured, makes the electricity
Press measurement module and the circuit to be measured etc. school impedance very little, and make the test electric current that the adjustable constant current source provided almost
Only flow in the circuit under test, and the current measurement system of the invention is accurately measured the impedance of the circuit to be measured, such as
This supplies electric power with the power supply source in the circuit belonging to the circuit under test again, obtains the circuit under test in actual work
Voltage signal, finally calculates electric current using the impedance of the circuit under test and the voltage signal.
Brief description of the drawings
Fig. 1, the flow diagram of one embodiment of the invention.
Fig. 2, the implementation schematic diagram (one) of one embodiment of the invention.
Fig. 3, the implementation schematic diagram (two) of one embodiment of the invention.
Fig. 4, the unit composition schematic diagram of one embodiment of the invention.
Fig. 5, the flow diagram of another embodiment of the present invention.
Embodiment
The detailed description of the invention and technology contents, now just coordinate schema to be described as follows：
Please refer to Fig.1 and Fig. 2, the present invention provide a kind of current measuring method, have comprising step：Step 1 100, according to one
The current direction of circuit 20 to be measured sequentially defines a test electric current input point 201, a first voltage test point 202, one second
Voltage detecting point 203 and one tests electric current output point 204；Step 2 101, one adjustable 31 and one voltage of constant current source of parallel connection are surveyed
Module 32 is measured in the circuit 20 to be measured, the impedance of the voltage measurement module 32 is much larger than the impedance of the circuit 20 to be measured, this is adjustable
Constant current source 31 is electrically connected the test electric current input point 201 and the test electric current output point 204 and is formed into a loop, which surveys
Amount module 32 is then electrically connected the first voltage test point 202 and the second voltage test point 203 and is formed into a loop；Step 3
102, supply current value different test electric current i in the circuit 20 to be measured using adjustable 31 gradation of constant current sourceB, pass through the electricity
Pressure measurement module 32 measures each test electric current iBDuring into the circuit 20 to be measured, the first voltage test point 202 and second
Voltage signal V between voltage detecting point 203RW；Step 4 103, calculates the first voltage test point 202 and is detected with second voltage
Point 203 is in wherein one test electric current i of differenceBWhen a voltage variety Δ VRW, and those test electric currents iBBetween one
Current change quantity Δ iB, according to voltage variety Δ VRWAnd current change quantity Δ iBCalculate the impedance of the circuit 20 to be measured
RW；Step 5 104, the forbidden energy adjustable constant current source 31, changes with the power supply source 21 in circuit 2 belonging to the circuit 20 to be measured
Supply electric power；And step 6 105：The first voltage test point 202 and second voltage are obtained using the voltage measurement module 32
Voltage signal V between test point 203RW, according to voltage signal VRWAnd the impedance R of the circuit 20 to be measuredWThis is calculated to treat
The electric current I on survey line road 20RW。
On the other hand, and Fig. 3 and Fig. 4 is referred to, the method for the present invention current measurement system 30 of also arranging in pairs or groups is implemented, the electric current
Measuring system 30 includes two current probes 301, two voltages perceive probe 302, this is adjustable constant current source 31, the voltage measurement module
32 with an arithmetic element 33.Two current probes, the 301 parallel contact circuit under test 20 is simultaneously contacted position in the circuit under test 20
Put and define the test electric current input point 201 and the test electric current output point 204, which perceives 302 parallel contact of probe
The circuit under test 20 simultaneously defines the first voltage test point 202 and second voltage inspection in the circuit under test 20 by contact position
Measuring point 203, the first voltage test point 202 are located at the test electric current input point 201 and the survey with the second voltage test point 203
Between examination electric current output point 204.Further, it is alleged now which perceives probe 302 with two voltage
Four-wire type probe, wherein one current probe 301 of the corresponding test electric current input point 201 is and corresponding first test point
Wherein the one of 202 voltage perceives probe 302 and is integrated on same club shaped structure, is then integrated in another club shaped structure both remaining
On.Furthermore one of two current probe 301 is anode in implementation process, another is then negative terminal.Two voltage perceives
Probe 302 is also same.
Also, the adjustable current source 31 connects two current probe 301, through the test electric current input point 201 and test electricity
Stream 204 gradation of output point provides the circuit under test 20 multiple current values different test electric current iB.The voltage measurement module
32 connect two voltage and perceive probe 302, obtain between the first voltage test point 202 and the second voltage test point 203
Each voltage signal V in the different test electric currentsRW.The arithmetic element 33 connects the adjustable current source 31 and the voltage is surveyed
Module 32 is measured, obtains each test electric current iBAnd each voltage signal VRWAnd calculate a current change quantity Δ iBAnd one electricity
Press variation delta VRW, according to current change quantity Δ iBAnd voltage variety Δ VRWCalculate the impedance of the circuit 20 to be measured
RW, when the forbidden energy adjustable current source 31 provides electric power to obtain the circuit 20 to be measured by a power supply source 21 in its affiliated circuit
Voltage signal VRW, by voltage signal VRWWith the impedance R of the circuit 20 to be measuredWCalculate the electric current of the circuit 20 to be measured
iRW.Also, the arithmetic element 33 can be implemented with a microcontrol processor, which can have been built by modes such as loadings
One calculation mechanism, to carry out related calculation.
Hold, the present invention is initial in implementing, and in step 1 100, specifies current segment to be measured in the circuit to be treated for this
Survey line road 20, the alleged circuit 20 to be measured can be a simple circuit for being laid with original paper.Then make two current probe 301 and be somebody's turn to do
Two voltages perceive probe 302 and contact the circuit 20 to be measured successively with parallel way, and the current direction based on the circuit to be measured according to
It is secondary to define the test electric current input point 201, the first voltage test point 202, the second voltage test point 203 and the test
Electric current output point 204.Hereafter 2 101 are entered step, order connects two current probe 301 respectively and two voltage perceives probe
The 302 adjustable constant current source 31 is parallel to the circuit 20 to be measured with the voltage measurement module 32.Furthermore present invention order is parallel to
The impedance of the voltage measurement module 32 of the circuit 20 to be measured is much larger than the circuit 20 to be measured, makes the voltage measurement module 32 with being somebody's turn to do
Circuit 20 to be measured etc. school impedance very little, that is, when there is electric current to flow through, electric current flows to almost all on the circuit 20 to be measured.
On the other hand, the adjustable constant current source 31 can with the test electric current input point 201, the test electric current output point 204 and should
Circuit 20 to be measured is formed into a loop (as Fig. 2 marks 22), the voltage measurement module 32 then can with the first voltage test point 202, should
Second voltage test point 203 and the circuit 20 to be measured form another circuit (as Fig. 2 marks 23), and enter the step 3 102.
In 102 implementation process of step 3, originally which controls the adjustable constant current source 31 to the circuit to be measured
The test electric current i that 20 outputs are 0.1 ampereB, and measure the first voltage test point 202 and the second voltage test point 203
Between voltage signal VRW, after the completion of, the arithmetic element 33 i.e. again the secondary control adjustable constant current source 31 to the circuit to be measured
The test electric current i that 20 outputs are 0.6 ampereB, and measure the first voltage test point 202 and the second voltage test point 203
Between voltage signal VRW, after completing to subscribe the number tested, into the step 4 103.Held in the step 4 103
During row, to acquired each voltage signal VRWAnd each test electric current iBCalculated, obtain the first voltage
Test point 202 is from the second voltage test point 203 in different test electric current iBVoltage variety Δ VRW, and those surveys
Try electric current iBBetween current change quantity Δ iB.Hereafter, according to voltage variety Δ VRWAnd current change quantity Δ iBCalculate
Go out the impedance R of the circuit 20 to be measuredW, and this calculating can be based on acquired by nurse law difficult to understand, repeating no more in this.Also, the present invention in
This lifts test electric current iBCurrent value be only for example, not limiting.
Then, forbidden energy adjustable constant current source 31, makes it stop exporting test electric current iB, change with the institute of circuit 20 to be measured
The power supply source 21 belonged in the circuit 2 supplies electric power to the circuit 20 to be measured, into the step 6 105.Utilize the voltage
Measurement module 32 obtains the voltage signal V between the first voltage test point 202 and the second voltage test point 203RW, according to
Instantly the voltage signal V obtainedRWAnd the impedance R of the circuit 20 to be measuredWCalculate the electric current i of the circuit 20 to be measuredRW。
In order to avoid the high-tension electricity of the power supply unit 21 output of the circuit 2 belonging to the circuit 20 to be measured pours into the electricity
Flow measuring system 30, and the problem of cause the current measurement system 30 to be damaged.In an embodiment, the current measurement system
Further include one positioned at the corresponding test electric current input point 201 wherein one current probe 301 and the adjustable constant current source 31 it
Between the first high voltage protection module 34, and one perceive and visit positioned at wherein one voltage of the corresponding first voltage test point 203
The second high voltage protection module 35 between pin 302 and the voltage measurement module 203.
Furthermore in order to make the voltage signal V measuredRWIt is able to be used by the arithmetic element 33, in an embodiment,
The voltage measurement module 32 includes a pair of voltage signal VRWCarry out the high impedance attenuation units 321 of energy attenuation.Further,
The voltage measurement module 32 further includes the filter module of the connection high impedance attenuation units 321, and it is low which includes one
Pass filtering unit 322, a high pass filter unit 323, an all-pass unit 324 and one are controlled by the arithmetic element 33 and according to this
21 species of power supply source select with the low-pass filter unit 322, the high pass filter unit 323 and the all-pass unit 324 its
One of handle voltage signal VRWSwitching switch 325.On the other hand, the method for the present invention step 6 105 further includes a son
Step 106：Selected according to 21 species of power supply source with the low-pass filter unit 322 or the high pass filter unit 323 to this
Voltage signal VRWHandled, if the power supply source 21 handles voltage letter for DC power supply with the low-pass filter unit 322
Number VRWIf the power supply source 21 handles voltage signal V for AC power with the high pass filter unit 323RW。
And referring to Fig. 5, in an embodiment, which includes one and connects the high impedance attenuation units
Signal buffer unit 326 between 321 and the filter module, and one connection the filter module and voltage signal V must be parsedRW
The phase current rectifying and wave filtering circuit 327 of included impedance operator.On the other hand, the method for the present invention step 6 105 is then comprising another
Sub-step 107：The open circuit of circuit 20 to be measured is made to be obtained between the first voltage test point 202 and second voltage detection 203
Voltage signal V between the first voltage test point 202 and second voltage detection 203RW, there is provided voltage signal VRWGive
One phase current rectifying and wave filtering circuit, to obtain voltage signal VRWIn the impedance operator that includes.Furthermore the alleged impedance operator is
Resistance characteristic, inductance characteristic and the capacitance characteristic of field notice.
In an embodiment, which is arranged at the filter module and phase rectifying and wave-filtering electricity comprising one
Signal amplification circuit 328 between road 327.On the other hand, which can more include one and be arranged on phase rectification filter
The D/A conversion circuit 329 of 327 prime of wave circuit, and one be arranged on 327 rear class of phase current rectifying and wave filtering circuit simulation
Digital conversion circuit 320.Furthermore the current measurement system 30 can more include a display interface 36, and measurement result is shown in
On.
Claims (11)
1. a kind of current measuring method, it is characterised in that have comprising step：
Step 1：One test electric current input point, first voltage detection are defined according to the current direction of a circuit to be measured successively
Point, a second voltage test point and a test electric current output point；
Step 2：An adjustable constant current source and a voltage measurement module in parallel are in the circuit to be measured, the resistance of the voltage measurement module
The anti-impedance much larger than the circuit to be measured, this is adjustable, and constant current source is electrically connected the test electric current input point and the test electric current is defeated
Go out a little and be formed into a loop, which is electrically connected the first voltage test point and the second voltage test point and is formed
Circuit；
Step 3：Using adjustable constant current source gradation test electric current different to the line feed current value to be measured, by this
When each test electric current of voltage measurement module measurement enters the circuit to be measured, which detects with second voltage
Voltage signal between point；
Step 4：The voltage of the first voltage test point and second voltage test point when the different test electric currents is calculated to become
A current change quantity between change amount, and those test electric currents, calculates according to the voltage variety and the current change quantity
The impedance of the circuit to be measured；
Step 5：The forbidden energy adjustable constant current source, changes and supplies electric power with the power supply source in the affiliated circuit of circuit to be measured；
And
Step 6：The voltage obtained using the voltage measurement module between the first voltage test point and second voltage test point is believed
Number, the electric current of the circuit to be measured is calculated according to the impedometer of the voltage signal and the circuit to be measured.
2. current measuring method as claimed in claim 1, it is characterised in that the step 6 further includes a sub-step：Make this treat
Line broken circuit is surveyed between the first voltage test point and the second voltage test point, obtain the first voltage test point and this
Voltage signal between two voltage detectings, there is provided the voltage signal gives a phase current rectifying and wave filtering circuit, to obtain voltage letter
The impedance operator included in number.
3. current measuring method as claimed in claim 1 or 2, it is characterised in that the step 6 further includes a sub-step：According to
Supply of electric power source category selection is handled the voltage signal with a low-pass filter unit or a high pass filter unit, if should
Power supply source handles the voltage signal for DC power supply with the low-pass filter unit, if the power supply source for AC power with
The high pass filter unit handles the voltage signal.
4. a kind of current measurement system, it is characterised in that include：
Two current probes, one circuit to be measured of parallel contact simultaneously define test electric current input in the circuit to be measured by contact position
Point and a test electric current output point；
Two voltages perceive probe, and the parallel contact circuit to be measured simultaneously defines a first voltage in the circuit to be measured by contact position
Test point and a second voltage test point, the first voltage test point are located at test electric current input with the second voltage test point
Between point and the test electric current output point；
One adjustable constant current source, connects the test electric current input point and the test electric current output point, through the test electric current input point
And the test electric current output point provides multiple current values different test electric current in the circuit to be measured by several times；
One voltage measurement module, connects the first voltage test point and the second voltage test point, obtains first voltage detection
Each voltage signal between point and the second voltage test point in the different test electric currents；
One arithmetic element, connects the adjustable constant current source and the voltage measurement module, obtain each test electric current and it is each should
Voltage signal and calculate a current change quantity and a voltage variety, calculated according to the current change quantity and the voltage variety
Go out the impedance of the circuit to be measured, the forbidden energy adjustable constant current source simultaneously makes the voltage measurement module obtain the circuit to be measured as belonging to it
The voltage signal in circuit during power supply source offer electric power, is calculated by the impedometer of the voltage signal and the circuit to be measured
The electric current of the circuit to be measured.
5. current measurement system as claimed in claim 4, it is characterised in that the current measurement system further includes one positioned at correspondence
The first high voltage protection module between wherein the one of the test electric current input point current probe and the adjustable constant current source, and
One perceived positioned at wherein one voltage of the corresponding first voltage test point between probe and the voltage measurement module it is second high
Press protection module.
6. current measurement system as claimed in claim 5, it is characterised in that the voltage measurement module, which includes a pair of voltage, to be believed
Number carry out energy attenuation high impedance attenuation units.
7. current measurement system as claimed in claim 6, it is characterised in that the voltage measurement module includes one and connects the high resistant
The filter module of antidamping unit, the filter module include a low-pass filter unit, a high pass filter unit, an all-pass unit with
And one by the arithmetic element control and according to the supply of electric power source category select with the low-pass filter unit, the high pass filter unit
And one of the all-pass unit handles the switching switch of the voltage signal.
8. current measurement system as claimed in claim 7, it is characterised in that the voltage measurement module includes one and connects the high resistant
Signal buffer unit between antidamping unit and the filter module.
9. current measurement system as claimed in claim 7, it is characterised in that the voltage measurement module includes one and connects the filtering
Module and the phase current rectifying and wave filtering circuit that the voltage signal includes impedance operator must be parsed.
10. current measurement system as claimed in claim 9, it is characterised in that the voltage measurement module is arranged at this comprising one
Signal amplification circuit between filter module and the phase current rectifying and wave filtering circuit.
11. current measurement system as claimed in claim 9, it is characterised in that the voltage measurement module is arranged on the phase comprising one
Position current rectifying and wave filtering circuit prime D/A conversion circuit, and one be arranged on the phase current rectifying and wave filtering circuit rear class simulation number
Word conversion circuit.
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| CN201610924341.7A CN107976568A (en) | 2016-10-24 | 2016-10-24 | A kind of current measuring method and its system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110488084A (en) * | 2019-09-26 | 2019-11-22 | 京信通信系统（中国）有限公司 | Pcb board branch current detection device and system |
| CN111123073A (en) * | 2019-12-27 | 2020-05-08 | 天津芯海创科技有限公司 | Quick self-checking device of hardware board card |
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| CN203705554U (en) * | 2014-02-10 | 2014-07-09 | 北京京东方显示技术有限公司 | Resistance measuring device |
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| CN110488084A (en) * | 2019-09-26 | 2019-11-22 | 京信通信系统（中国）有限公司 | Pcb board branch current detection device and system |
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