CN109374961B - A kind of current signal detecting device - Google Patents
A kind of current signal detecting device Download PDFInfo
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- CN109374961B CN109374961B CN201811287245.1A CN201811287245A CN109374961B CN 109374961 B CN109374961 B CN 109374961B CN 201811287245 A CN201811287245 A CN 201811287245A CN 109374961 B CN109374961 B CN 109374961B
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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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Abstract
The invention discloses a kind of current signal detecting devices, and including the D.C mutual-inductor for obtaining circuit under test electric current, D.C mutual-inductor connects current compensation circuit, and current compensation circuit can survey electric current for compensating to the low frequency signal of acquisition to obtain stabilization；The signal output end connection of current compensation circuit plus the operational amplifier circuit of offset signal, the operational amplifier circuit of offset signal is added to be used to the stabilization can survey electric current and be biased and amplify, the signal output end of the operational amplifier circuit of offset signal is added to be connected with single-chip microcontroller, the signal output end of single-chip microcontroller is connected with display screen；The present invention can carry out current detecting under the conditions of not destroying original existing, and will not reduce detection accuracy.
Description
[technical field]
The invention belongs to technical field of current detection more particularly to a kind of current signal detecting devices.
[background technique]
Current signal detector is a kind of detection device, it can experience the information of tested electric current, according to certain rule
It is for conversion into the information output of the electric signal or other required forms that meet certain standard needs, to meet transmission, the place of information
Reason, storage, display, record and control etc. require.
Not only application range is smaller for existing current signal detector, and the requirement to operation and maintenance personnel is compared
Height is unfavorable for daily maintenance and maintenance.It can be seen that above-mentioned existing current signal detector.In structure and use, it is clear that
There are still there is inconvenient and defect, moreover, existing current tester is when measuring electric current, it is necessary to carry out tester with detection line
Connection will necessarily destroy original route, and then influence the safety and service life of original route.
[summary of the invention]
The object of the present invention is to provide a kind of current signal detecting device, can under the conditions of not destroying original existing into
Row current detecting, and detection accuracy will not be reduced.
The invention adopts the following technical scheme: a kind of current signal detecting device, including for obtaining circuit under test electric current
D.C mutual-inductor, D.C mutual-inductor connects current compensation circuit, and current compensation circuit is used to carry out the low frequency signal of acquisition
Compensation, can survey electric current to obtain stabilization；
The signal output end connection of current compensation circuit plus the operational amplifier circuit of offset signal, add the operational amplifier circuit of offset signal
It can survey electric current for that will stablize and be biased and amplify, the signal output end of the operational amplifier circuit of offset signal is added to be connected with monolithic
The signal output end of machine, single-chip microcontroller is connected with display screen；
Current compensation circuit includes operational amplifier U1；
The 5th pin of operational amplifier U1 is separately connected one end of diode D1, D2, resistance R9 and D.C mutual-inductor, and
The 5th pin of U1, diode D1, D2, resistance R9 and D.C mutual-inductor the end be grounded；
The 6th pin of operational amplifier U1 is respectively connected to the other end of diode D1, D2, and is also connected with resistance R1's
One end, the other end of resistance R1 are respectively connected to the other end of resistance R9 and D.C mutual-inductor；
The 6th pin of operational amplifier U1 is also connected to one end of capacitor C2, and the other end of the capacitor C2 is separately connected
To one end of resistance R3 and capacitor C3；The other end of the resistance R3 and capacitor C3 is connected to the 7th of operational amplifier U1 and draws
Foot；
The 8th pin of operational amplifier U1 meets high level VCC；
The 4th pin of operational amplifier U1 meets low level-VCC；
The parallel interface and P5 interface of the third pin connection resistance R3 and capacitor C3 of operational amplifier U1.
Further, operational amplifier U1 uses TL072 chip；
Diode D1, D2 model 1N4148；
The resistance value of resistance R1, R3, R9 are respectively 340 Ω, 1000 Ω, 100 Ω；
D.C mutual-inductor is inductance L1, and inductance L1 is formed by enameled wire magnet ring coiling, and the magnet ring is manganese-zinc magnetic ring, described
Magnet ring outer diameter is 22mm, internal diameter 14mm, a height of 8mm, and the enamel-cover linear diameter is 0.21mm, and coiling the number of turns is 300 circles；
Capacitor C2 and C3 are respectively 4.7uF, 56pF.
Further, the operational amplifier circuit for adding offset signal includes amplifier LM339A；
Series resistance R6 between the second pin of amplifier LM339A and the 4th pin；
The second pin of amplifier LM339A is also connected with the first end angle and second end angle of interface P4, interface P4 be used for
Single-chip microcontroller connection；
The 4th pin also series resistance R5 and capacitor C1 of amplifier LM339A is followed by the first end angle of interface P3, is connect
Mouth P3 with current compensation circuit for connecting；
The 5th pin of amplifier LM339A is separately connected one end of resistance R4 and resistance R2, another termination of resistance R4
Ground, the other end of resistance R2 are separately connected one end of resistance R10 and slide rheostat R11, another termination high level of resistance R10
The other end of VCC, slide rheostat R11 are grounded.
Further, amplifier LM339A is first amplifier unit of LM339 chip；
The resistance value of resistance R2, R4, R5, R6, R10 and R11 are respectively 4k Ω, 10k Ω, 4k Ω, 10k Ω, 300 Ω, 10k
Ω；
Capacitor C1 is 200uF.
Further, the model STM32F429 of single-chip microcontroller.
It further, further include standard signal generation unit, standard signal generation unit is used to provide standard current signal,
To realize the precision checking to current signal detecting device.
Further, standard signal generation unit includes the signal generator and power amplifier interconnected, signal hair
The model RIGOL DG4062 of raw device, power amplifier select ADA4870 chip.
The beneficial effects of the present invention are: the induction coil by current compensation operational amplifier circuit obtains Small Current Signal to be measured,
By adding the operational amplifier circuit of offset signal to carry out power amplification, then collection voltages, it ensure that signal acquisition precision, pass through A/D mould
Block sampling obtains semaphore, and then the processing using chip microcontroller to acquisition signal, and on a display screen by processing result value
Aobvious, display waveform simultaneously draws spectrogram.
[Detailed description of the invention]
Fig. 1 is that the principle of the present invention connects block diagram；
Fig. 2 is power amplification circuit schematic diagram of the invention；
Fig. 3 is current compensation operational amplifier circuit schematic diagram of the invention；
Fig. 4 is of the invention plus offset signal operational amplifier circuit schematic diagram.
In figure: 1, signal generator；2, power amplification circuit；3, current compensation operational amplifier circuit；4, add the fortune of offset signal
Electric discharge road；5, single-chip microcontroller；6, display screen.
[specific embodiment]
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
The invention discloses a kind of current signal detecting devices, as shown in Figure 1, including for obtaining circuit under test electric current
D.C mutual-inductor, the D.C mutual-inductor are that coil is made with magnet ring and enameled wire coiling, obtain induced current, and D.C mutual-inductor connects
Current compensation circuit 3 is connect, current compensation circuit 3 can survey electric current for compensating to the low frequency signal of acquisition to obtain stabilization.
The signal output end connection of current compensation circuit 3 plus the operational amplifier circuit 4 of offset signal add the amplifier electricity of offset signal
Road 4 can survey electric current and be biased and amplify for that will stablize, and the signal output end of the operational amplifier circuit 4 of offset signal is added to be connected with list
Piece machine 5, the signal output end of single-chip microcontroller 5 are connected with display screen 6.
As shown in figure 3, current compensation circuit 3 includes operational amplifier U1, operational amplifier U1 uses TL072 chip.It should
Circuit select it is internal there are two the TL072 chip of operational amplifier, by sensor current signal by resistance R9 from the 5th pin and
The input of 6th pin accesses D1 and D2 as protection, R3, C2, C3 constitute feedback network, right to prevent input terminal accidental short circuit
Low frequency signal compensates, and improves low frequency characteristic.
The present invention obtains induced voltage by D.C mutual-inductor, and induced voltage is formed stream compensation operational amplifier circuit to TL072
3, thus obtain one it is metastable survey electric current, TL072 chip have low-power consumption, wide common mode and differential mode voltage range,
Internal frequency compensation, low input bias current and offset current characteristic.
The 5th pin of operational amplifier U1 is separately connected one end of diode D1, D2, resistance R9 and D.C mutual-inductor, and
The 5th pin of U1, diode D1, D2, resistance R9 and D.C mutual-inductor the end be grounded；
The 6th pin of operational amplifier U1 is respectively connected to the other end of diode D1, D2, and is also connected with resistance R1's
One end, the other end of resistance R1 are respectively connected to the other end of resistance R9 and D.C mutual-inductor.D.C mutual-inductor be inductance L1 by
Enameled wire magnet ring coiling forms, and magnet ring is manganese-zinc magnetic ring, and magnet ring outer diameter is 22mm, internal diameter 14mm, a height of 8mm, and enameled wire is straight
Diameter is 0.21mm, and coiling the number of turns is 300 circles.
Diode D1, D2 model 1N4148, resistance R9 are 100 Ω, and resistance R1 is 340 Ω.
The 6th pin of operational amplifier U1 is also connected to one end of capacitor C2, and the other end of the capacitor C2 is separately connected
To one end of resistance R3 and capacitor C3, the other end of the resistance R3 and capacitor C3 are connected to the 7th of operational amplifier U1 and draw
Foot；C3 is 56pF, and C2 4.7uF, R3 are 1000 Ω.
The 8th pin of operational amplifier U1 meets high level VCC；
The 4th pin of operational amplifier U1 meets low level-VCC；
The parallel interface and interface P5 of the third pin connection resistance R3 and capacitor C3 of operational amplifier U1.
As shown in figure 4, plus offset signal operational amplifier circuit 4 include amplifier LM339A；Amplifier LM339A is LM339 core
First amplifier unit of piece.
The second pin of amplifier LM339A and the 4th pin serial connection resistance R6, R6 are 10k Ω.
The second pin of amplifier LM339A is also connected with the first end angle and second end angle of interface P4 (i.e. winding displacement P4), interface
P4 with single-chip microcontroller 5 for connecting, the model STM32F429 of single-chip microcontroller 5.
The 4th pin also series resistance R5 and capacitor C1 of amplifier LM339A is followed by the first end angle of interface P3, is connect
For mouth P3 for connecting with current compensation circuit 3, R5 is 4k Ω, and capacitor C1 is 200uF.
The 5th pin of amplifier LM339A is separately connected one end of resistance R4 and resistance R2, another termination of resistance R4
Ground, the other end of resistance R2 are separately connected one end of resistance R10 and slide rheostat R11, another termination high level of resistance R10
The other end of VCC, slide rheostat R11 are grounded.R4 is 10k Ω, and R2 is 4k Ω, and the resistance value of resistance R10 and R11 are respectively 300
Ω、10kΩ。
In this plus the operational amplifier circuit 4 of offset signal, for the ease of detection, it is added to amplifying circuit, electricity in the present embodiment
Pressure amplification factor beThe multiple of method can be specifically designed according to applicable cases, separately
Outside, since rear class STM32F429 single-chip microcontroller can only detect 0~3.3V voltage, to add biasing circuit, amount of bias convenient for detection
It is adjustable.
The invention also includes standard signal generation unit, standard signal generation unit is used to provide standard current signal, with
Realize the precision checking to current signal detecting device.By standard signal generation unit, standard signal is generated, then passes through signal
Detection device measures, and can verify the precision of signal supervisory instrument of the invention.
Standard signal generation unit includes the signal generator 1 and power amplifier 2 interconnected, signal generator 1
Model RIGOL DG4062, power amplifier select ADA4870 chip.
As shown in Fig. 2, the gentle peripheral circuit of chip ADA4870 is specifically arranged as follows in power amplifier 2:
The the first pin connecting resistance R13 and high level VCC of chip ADA4870, wherein resistance R3 is 3.9k Ω；
The parallel interface of connecting resistance R13 and zener diode D3 after the third pin serial connection resistance R12 of chip ADA4870,
Wherein resistance R12 is 4k Ω, and zener diode D3 model is selected as 18TQ045；
The 4th pin serial connection resistance R14 of chip ADA4870 is followed by zener diode D3 and low level-VCC, resistance R14
For 2k Ω；
The 6th pin serial connection capacitor C8 of chip ADA4870 is followed by P1 interface, which is used to connect with signal generator 1
It connects；
It is grounded after series resistance R8, R7 of the 8th pin of chip ADA4870, resistance R8 is 5.1k Ω, and resistance R7 is
130Ω；
The 11st pin of chip ADA4870 and the 12nd pin are grounded after distinguishing shunt capacitance C5 and C6, wherein capacitor
C5 is 220uF, and capacitor C6 is 100nF；
The 14th pin, the 15th pin, the 16th pin and the 17th pin of chip ADA4870 is all connected to P2 and connects
Mouthful；
It is grounded after the 18th pin serial connection C4 of chip ADA4870, then the C7 that connects is separately connected high level and the 20th again
Pin, wherein capacitor C4 is 100nF, and capacitor C7 is 220uF.
Using ADA4870 chip, power amplification circuit 2 is constituted, ADA4870 is the high speed electric current of a unity gain stable
Feedback-type amplifier is encapsulated using Power SOIC, provides the exposed radiating block of high-termal conductivity, it can be achieved that effectively heat dissipation, performance are steady
It is fixed, it is very suitable to driving high-voltage power field effect transistor.1A output electric current is capable of providing using 40V power supply and 2500V/ μ s is pressed
Slew Rate, integrated level is high, and periphery circuit design is simple, is easy to debug.In addition, it also has Thermal protection and turn-off function, safely may be used
It leans on.
In the power amplifier 2, circuit is using input in the same direction, feedback resistance Rf=R7+R8=130+5100=5230
Ω can change the multiple of amplification voltage, the i.e. multiple of power amplification by adjusting resistance value.
Embodiment
It as shown in table 1, is the test data and analysis of the present embodiment, i.e. current detecting analyzing circuit test data.
Table 1
In upper table, the theoretical standard frequency and electric current that frequency and electric current are respectively measured signal are inputted, display frequency and aobvious
Show that electric current is respectively the practical frequency and measured current of current signal detecting device of the present invention, precision is measured data and theoretical mark
Error between quasi- data.With enameled wire coiling production current sensor to obtain current signal in the embodiment, design
Current signal tests and analyzes circuit, measures and show the peak-to-peak value and frequency of current signal.It is according to upper table it will be evident that tested
Sinusoidal current peak-to-peak value range is 10mA~1A, and current measurement precision is better than 5%, and frequency measurement accuracy is better than 1%.
In addition, about for the power amplification circuit test data in the present embodiment it is as shown in table 2.
Table 2
Test request: making to input sinusoidal signal frequency range 50Hz~1KHz, measures and records to obtain 10 Ω load function
The voltage value at rate resistance both ends calculates and records its current peak value.After generating signal progress power amplification to derived digital signal,
In output end 10 Ω ohmic loads in parallel, input sinusoidal signal frequency is adjusted, range is 50Hz~1KHz, should with oscillograph test
Resistance both end voltage is effective, records and calculates current effective value, and the power amplifier in the present embodiment can be effective as seen from table
Binding signal generator generate frequency range be 50Hz~1kHz signal source.
Prime carries out power amplification using ADA4870 chip in the present invention, and rear class passes through the sense of current compensation operational amplifier circuit
It answers coil to obtain Small Current Signal to be measured, power amplification, CS5463 module collection voltages, A/D is set and carried out by LM339 biasing
Sampling obtains semaphore, and then the processing using STM32F429 chip microcontroller to acquisition signal, and processing result value is being shown
Display waveform and spectrogram is drawn on device.The present invention has improvement, and significantly low frequency characteristic, application range are wider.
Through the foregoing embodiment it is found that when inputting sinusoidal signal frequency range is 50Hz~1kHz, 10 Ω load is flowed through
The current peak value of resistance is not less than 1A, and current signal is without obvious distortion.Current measurement sinusoidal current peak-to-peak value range is 10mA
~1A, current measurement precision are better than 5%, and frequency measurement accuracy is better than 1%.Signal generator exports random waveform, such as square wave
When with triangular wave, fundamental frequency range is 50Hz~200Hz, measures current signal fundamental frequency, and frequency measurement accuracy is better than
1%；Basic and each harmonic component amplitude (amplitude) is measured, current harmonics measurement frequency is more than 1kHz, and measurement accuracy is excellent
In 5%.
Claims (7)
1. a kind of current signal detecting device, which is characterized in that including the D.C mutual-inductor for obtaining circuit under test electric current, institute
D.C mutual-inductor connection current compensation circuit (3) is stated, the current compensation circuit (3) is for mending the low frequency signal of acquisition
It repays, electric current can be surveyed to obtain stabilization；
The signal output end connection of the current compensation circuit (3) plus the operational amplifier circuit (4) of offset signal, described plus offset signal
Operational amplifier circuit (4) be used to the stabilization can survey electric current and be biased and amplify, described plus offset signal operational amplifier circuit (4)
Signal output end be connected with single-chip microcontroller (5), the signal output end of the single-chip microcontroller (5) is connected with display screen (6)；
The current compensation circuit (3) includes operational amplifier U1；
The 5th pin of the operational amplifier U1 is separately connected one end of diode D1, D2, resistance R9 and D.C mutual-inductor, and
The 5th pin of U1, diode D1, D2, resistance R9 and D.C mutual-inductor the end be grounded；
The 6th pin of the operational amplifier U1 is respectively connected to the other end of diode D1, D2, and is also connected with resistance R1's
The other end of one end, the resistance R1 is respectively connected to the other end of resistance R9 and D.C mutual-inductor；
The 6th pin of the operational amplifier U1 is also connected to one end of capacitor C2, and the other end of the capacitor C2 is separately connected
To one end of resistance R3 and capacitor C3；The other end of the resistance R3 and capacitor C3 is connected to the 7th of operational amplifier U1 and draws
Foot；
The 8th pin of the operational amplifier U1 meets high level VCC；
The 4th pin of the operational amplifier U1 meets low level-VCC；
The parallel interface and interface P5 of the third pin connection resistance R3 and capacitor C3 of the operational amplifier U1.
2. a kind of current signal detecting device as described in claim 1, which is characterized in that the operational amplifier U1 is used
TL072 chip；
Diode D1, D2 model 1N4148；The resistance value of described resistance R1, R3, R9 are respectively 340 Ω, 1000 Ω, 100
Ω；
The D.C mutual-inductor is inductance L1, and the inductance L1 is formed by enameled wire magnet ring coiling, and the magnet ring is manganese-zinc magnetic ring,
The magnet ring outer diameter is 22mm, internal diameter 14mm, a height of 8mm, and the enamel-cover linear diameter is 0.21mm, and coiling the number of turns is 300 circles；
The capacitor C2 and C3 is respectively 4.7uF, 56pF.
3. a kind of current signal detecting device as claimed in claim 1 or 2, which is characterized in that described plus offset signal fortune
Electric discharge road (4) includes amplifier LM339A；
Series resistance R6 between the second pin and the 4th pin of the amplifier LM339A；
The second pin of the amplifier LM339A is also connected with the first end angle and second end angle of interface P4, and the interface P4 is used
It is connect in the single-chip microcontroller (5)；
The 4th pin also series resistance R5 and capacitor C1 of the amplifier LM339A is followed by the first end angle of interface P3, institute
Interface P3 is stated for connecting with the current compensation circuit (3)；
The 5th pin of the amplifier LM339A is separately connected one end of resistance R4 and resistance R2, the other end of the resistance R4
Ground connection, the other end of the resistance R2 are separately connected one end of resistance R10 and slide rheostat R11, the resistance R10 other end
Connect high level VCC, the other end ground connection of the slide rheostat R11.
4. a kind of current signal detecting device as claimed in claim 3, which is characterized in that the amplifier LM339A is
First amplifier unit of LM339 chip；
The resistance value of described resistance R2, R4, R5, R6, R10 and R11 are respectively 4k Ω, 10k Ω, 4k Ω, 10k Ω, 300 Ω, 10k
Ω；
The capacitor C1 is 200uF.
5. a kind of current signal detecting device as claimed in claim 4, which is characterized in that the model of the single-chip microcontroller (5)
STM32F429。
6. a kind of current signal detecting device as described in claim 1 or 4 or 5, which is characterized in that further include standard signal hair
Raw unit, the standard signal generation unit is for providing standard current signal, to realize to the current signal detecting device
Precision checking.
7. a kind of current signal detecting device as claimed in claim 6, which is characterized in that the standard signal generation unit packet
Include the signal generator (1) and power amplifier (2) of interconnection, the model RIGOL of the signal generator (1)
DG4062, the power amplifier select ADA4870 chip.
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| CN201811287245.1A CN109374961B (en) | 2018-10-31 | 2018-10-31 | A kind of current signal detecting device |
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| CN109884382A (en) * | 2019-03-22 | 2019-06-14 | 南京邮电大学 | A kind of current signal detecting device based on FPGA |
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