CN208621683U - A kind of high accuracy number current sensor - Google Patents
A kind of high accuracy number current sensor Download PDFInfo
- Publication number
- CN208621683U CN208621683U CN201820973805.8U CN201820973805U CN208621683U CN 208621683 U CN208621683 U CN 208621683U CN 201820973805 U CN201820973805 U CN 201820973805U CN 208621683 U CN208621683 U CN 208621683U
- Authority
- CN
- China
- Prior art keywords
- circuit
- digiboard
- output end
- input terminal
- analog
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The utility model discloses a kind of high accuracy number current sensors, including construction package and electronic building brick, the construction package includes transformer casing and digiboard shell, the electronic building brick includes mutual inductor and digiboard, the digiboard includes gain adjustment circuit, analog to digital conversion circuit, signal isolation circuit, processor and telecommunication circuit, the output end of the mutual inductor is connected with the input terminal of gain adjustment circuit, the output end of the gain adjustment circuit is connected with the input terminal of filter circuit, the output end of the filter circuit is connected with the input terminal of analog to digital conversion circuit, the output end of analog-digital conversion circuit as described is connected with the input terminal of signal isolation, the output end of the signal isolation circuit is connected with the input terminal of processor, the output end of the processor is connected with the input terminal of telecommunication circuit.The utility model has the characteristics that be easily achieved, measuring accuracy is high, practicability is good, and realizes the digitized processing of electric current output analog signal.
Description
Technical field
The utility model relates to technical field of current detection more particularly to a kind of high accuracy number current sensors.
Background technique
Under the application of the market of new energy, the Rapid development stage that electric car industry is risen and direct current system maturation, make
Obtain the high precision electric current transducer huge market demand.However in precision current sensor field, city, overseas enterprise is had been limited to
Monopolization, and it is at high price, have a single function, most of is analog signal output.
Based on current domestic Industry, it would be highly desirable to develop domestic high accuracy number current sensor, therefore most probably
High accuracy number current sensor is captured by digitlization, high-precision, wide-range, clear superiority low in cost and reliable performance
Domestic market share changes Industry, high accuracy number current sensor is allowed to be popularized.
Therefore, we have proposed a kind of high accuracy number current sensors for solving the above problems.
Utility model content
Purpose of the utility model is to solve it is existing in the prior art it is at high price, have a single function, be largely
Analog signal output, and the disadvantage that measuring accuracy is low, and a kind of high accuracy number current sensor proposed.
To achieve the goals above, the utility model adopts the technical scheme that
A kind of high accuracy number current sensor, including construction package and electronic building brick, the construction package include mutual inductance
Device shell and digiboard shell, the electronic building brick include mutual inductor and digiboard, the digiboard include gain adjustment circuit,
Analog to digital conversion circuit, signal isolation circuit, processor and telecommunication circuit, the output end and gain adjustment circuit of the mutual inductor
Input terminal be connected, the output end of the gain adjustment circuit is connected with the input terminal of filter circuit, the filter circuit it is defeated
Outlet is connected with the input terminal of analog to digital conversion circuit, the output end and the input terminal phase of signal isolation of analog-digital conversion circuit as described
Even, the output end of the signal isolation circuit is connected with the input terminal of processor, the output end and telecommunication circuit of the processor
Input terminal be connected.
Preferably, the mutual inductor is mounted on inside transformer casing, and the digiboard is mounted on digiboard housings,
On digiboard shell, the mutual inductor is connected the transformer casing with digiboard, the transformer casing and digiboard
Shell is connected.
Preferably, the mutual inductor is fluxgate current transformer.
Preferably, the filter circuit is second-order low-pass filter.
Preferably, analog-digital conversion circuit as described is 16 SAR type analog-to-digital converter.
Preferably, the processor is the microcontroller of 32 Cortex M3 kernels.
The beneficial effects of the utility model are: digital sensor uses integrated A/D conversion circuit, digitized signal
Transmission and digital filtering technique, sensor signal transmission range farther out, strong antijamming capability, analog signal in digital sensor
Transmission range is extremely short, while sensor outer housing itself is again a good shielding case, largely improves sensor
Stability.On the other hand, intelligentized basis is digitlization, and the digitized signal of output is easy to connect with intellectualizing system
It connects, with the intelligence systems fast integration such as industry internet, Internet of Things.The utility model have be easily achieved, measuring accuracy is high, real
With the good feature of property, and realize the digitized processing of electric current output analog signal.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of high accuracy number current sensor of the utility model；
Fig. 2 is a kind of system block diagram of high accuracy number current sensor of the utility model.
Fig. 3 is a kind of circuit diagram of high accuracy number current sensor of the utility model.
In figure: 10 construction packages, 11 electronic building bricks, 12 transformer casings, 13 digiboard shells, 14 mutual inductors, 15 numbers
Plate, 21 gain adjustment circuits, 22 filter circuits, 23 analog to digital conversion circuits, 24 signal isolation circuits, 25 processors, 26 communication electricity
Road.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.
Refering to fig. 1, the utility model proposes a kind of high accuracy number current sensor, including construction package 10 and electronics
Component 11, wherein construction package 10 includes transformer casing 12 and digiboard shell 13, and electronic building brick 11 includes 14 He of mutual inductor
Digiboard 15.
Referring to Fig.2, digiboard 15 includes gain adjustment circuit 21, filter circuit 22, analog to digital conversion circuit 23, signal isolation
Circuit 24, processor 25 and telecommunication circuit 26.The output end of gain adjustment circuit 21 is connected with the input terminal of filter circuit 22, filter
The output end of wave circuit 22 is connected with the input terminal of analog to digital conversion circuit 23, the output end and signal isolation of analog to digital conversion circuit 23
The input terminal of circuit 24 is connected, and the output end of signal isolation circuit 24 is connected with the input terminal of processor 25, processor 25 it is defeated
Outlet is connected with the input terminal of telecommunication circuit 26, and the output end of telecommunication circuit 26 is connected with external module.
Gain circuitry 21, resistance R5, resistance R6, capacitor are formed refering to Fig. 3, resistance R1, resistance R2, resistance R3 and chip U1
C1, capacitor C2 and chip U3 form filter circuit 22, and resistance R7 and chip U2 form analog to digital conversion circuit 23.
Wherein, one end of resistance R2 is connect with one end of resistance R1, and the other end of resistance R2 is connect with one end of resistance R3,
The other end of resistance R1 and resistance R3 are connect with chip U1, chip U1, resistance R5, resistance R6, chip U3, resistance R7 and chip
U2 is sequentially connected in series, and resistance R5 and capacitor C1 are in parallel, and one end of capacitor C2 is connected between resistance R5 and chip U3, capacitor C2's
Other end ground connection.
In the present embodiment, mutual inductor 14 is fluxgate current transformer, and gain adjustment circuit 21 is gain amplifier, filter
Wave circuit 22 is second-order low-pass filter, and analog to digital conversion circuit 23 is 16 SAR type analog-to-digital converter.
The utility model proposes a kind of high accuracy number current sensor, including following calculating step:
S1, it is directed to tested electric current Id, 14 output current signal I of mutual inductoriFor Id×Wd, wherein WdFor 14 primary side of mutual inductor
With the secondary side turn ratio.Current signal IiVoltage signal U is converted by resistance R2i, then UiFor Id×Wd×R2, wherein resistance R2 is essence
Close Low Drift Temperature resistance, resistance value vary with temperature small, reachable 10ppm, to obtain higher output signal-to-noise ratio.
S2, voltage signal UiBy gain adjustment circuit 21, according to voltage signal UiThe suitable gain of amplitude variation selection is put
Big multiple G1, then 21 output voltage of gain adjustment circuit is U1, it can thus be concluded that: U1=Id×Wd×R2×G1；
S3, in order to further eliminate signal high-frequency noises, using low-pass filtering technique filter out or inhibitory character frequency range outside
Various noises and signal so that the signal-to-noise ratio in characteristic spectra improves.In output voltage U1With the input terminal of filter circuit 22
It is connected, filter circuit 22 is the second-order low-pass filter of Sallen-Key topological unit gain, resistance R5 and resistance R6 value phase
Together, capacitor C1 capacitance is 2 times of capacitor C2, then cutoff frequency f are as follows:
S4,22 output voltage U of filter circuit2It is connected with the input terminal of analog to digital conversion circuit 23, analog voltage signal U2By
The accessible digital signal of output processor 24 after A/D conversion chip carries out constant duration and samples to obtain i1,i2,
i3......in-1,in。
S5, processor 24 obtain carrying out FIR filtering processing after discrete digital sampled signal, and FIR is to have limit for length's unit
Impact response filter.According to signal U2Spectral characteristic design N rank FIR wave digital lowpass filter obtains coefficient h0,h1,
h2......hN-2,hN-1, for the filter of N tap, coefficient is h (k), then exporting are as follows:
Y (n)=h (0) x (n)+h (1) x (n-1)+h (2) x (n-2)+...+h (N-1) x (n-N-1)
Wherein x1,x2,x3......xn-1,xnThe as obtained i of discrete sampling1,i2,i3......in-1,in.By number
Filtering data y is obtained after filtering processing1,y2,y3......yn-1,yn, AC signal is calculated by the zero crossing of front and back 2
Frequency fac, and then obtain the signal periodAlternating current virtual value I is obtained according to discrete sampling datarmsAre as follows:
DC current mean value IavgAre as follows:
Wherein N is sampling number in signal period, and i (k) is the instantaneous value of kth time sampling.
The preferable specific embodiment of the above, only the utility model, but the protection scope of the utility model is not
It is confined to this, anyone skilled in the art is within the technical scope disclosed by the utility model, practical according to this
Novel technical solution and its utility model design are subject to equivalent substitution or change, should all cover the protection model in the utility model
Within enclosing.
Claims (6)
1. a kind of high accuracy number current sensor, including construction package (10) and electronic building brick (11), which is characterized in that described
Construction package (10) includes transformer casing (12) and digiboard shell (13), and the electronic building brick (11) includes mutual inductor (14)
With digiboard (15), the digiboard (15) includes gain adjustment circuit (21), analog to digital conversion circuit (23), signal isolation circuit
(24), processor (25) and telecommunication circuit (26), the output end of the mutual inductor (14) are defeated with gain adjustment circuit (21)
Enter end to be connected, the output end of the gain adjustment circuit (21) is connected with the input terminal of filter circuit (22), the filter circuit
(22) output end is connected with the input terminal of analog to digital conversion circuit (23), the output end and signal of analog-digital conversion circuit as described (23)
The input terminal of isolation is connected, and the output end of the signal isolation circuit (24) is connected with the input terminal of processor (25), the place
The output end of reason device (25) is connected with the input terminal of telecommunication circuit (26).
2. a kind of high accuracy number current sensor according to claim 1, which is characterized in that mutual inductor (14) peace
Inside transformer casing (12), the digiboard (15) is mounted on inside digiboard shell (13), the transformer casing
(12) digiboard shell (13) above, the mutual inductor (14) is connected with digiboard (15), the transformer casing (12) and
Digiboard shell (13) is connected.
3. a kind of high accuracy number current sensor according to claim 2, which is characterized in that the mutual inductor (14) is
Fluxgate current transformer.
4. a kind of high accuracy number current sensor according to claim 1, which is characterized in that the filter circuit (22)
For second-order low-pass filter.
5. a kind of high accuracy number current sensor according to claim 1, which is characterized in that analog-digital conversion circuit as described
It (23) is 16 SAR type analog-to-digital converter.
6. a kind of high accuracy number current sensor according to claim 1, which is characterized in that the processor (25) is
The microcontroller of 32 Cortex M3 kernels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820973805.8U CN208621683U (en) | 2018-06-22 | 2018-06-22 | A kind of high accuracy number current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820973805.8U CN208621683U (en) | 2018-06-22 | 2018-06-22 | A kind of high accuracy number current sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208621683U true CN208621683U (en) | 2019-03-19 |
Family
ID=65703205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820973805.8U Active CN208621683U (en) | 2018-06-22 | 2018-06-22 | A kind of high accuracy number current sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208621683U (en) |
-
2018
- 2018-06-22 CN CN201820973805.8U patent/CN208621683U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103257271A (en) | Device and method for detecting micro grid harmonic wave and inter-harmonics based on STM32F107VCT6 | |
| CN106982035A (en) | A kind of amplifier circuit in low noise | |
| KR20170110103A (en) | Electronic integrator for Rogowski coil sensor | |
| CN105676263B (en) | A kind of pulse signal peak-value detection method based on phase compensation | |
| CN108535539A (en) | A kind of electric energy meter and its AFE(analog front end) meeting IR46 standards | |
| CN103281042B (en) | Remote transmission IEPE type charge amplifier | |
| CN208621683U (en) | A kind of high accuracy number current sensor | |
| CN201946423U (en) | Integrator circuit for electronic current transformer based on Rogowski coil | |
| CN209182489U (en) | A kind of direct current energy meter current channel conditioning circuit | |
| Vainio et al. | A class of predictive analog filters for sensor signal processing and control instrumentation | |
| CN209559967U (en) | A kind of current signal detecting device | |
| CN104504272B (en) | The digital integrator implementation method being fitted based on perfect reconstruction filter impulse responses | |
| CN110175360A (en) | The method and distance protecting method of artificial capacitor formula voltage transformer transient state output characteristics | |
| CN214669650U (en) | Cold atom gravimeter ground low-frequency vibration signal processing circuit | |
| CN117074771A (en) | Radio frequency electric quantity measuring device and measuring method | |
| Kušljević | A simultaneous estimation of frequency, magnitude, and active and reactive power by using decoupled modules | |
| CN208432658U (en) | A kind of electric energy meter and its AFE(analog front end) meeting IR46 standard | |
| CN114720773A (en) | Resistance measuring device and terminal equipment | |
| CN205786850U (en) | A kind of mains by harmonics signals collecting pretreatment circuit | |
| CN103823124A (en) | Power line conduction interference signal detection circuit suitable for field electromagnetic compatibility detection | |
| CN107422182A (en) | Direct current energy meter | |
| CN218584881U (en) | Three-phase four-wire electric energy metering circuit and electric energy meter | |
| CN111487476B (en) | Quasi-peak detection method and quasi-peak detector | |
| CN218567469U (en) | Three-phase four-wire electric energy metering circuit and electric energy meter | |
| CN202126267U (en) | Electronic measurement device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |