CN112986651A - Signal processing method, signal processing device, electronic equipment and computer storage medium - Google Patents
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Abstract
The application provides a signal processing method, a signal processing device, electronic equipment and a computer storage medium. The signal processing method comprises the following steps: acquiring an excitation square wave signal; generating an induction signal by induction based on the excitation square wave signal; amplifying the second harmonic component of the induction signal, and inhibiting other harmonic components of the induction signal to obtain a differential mode signal; wherein, the other harmonic components are harmonic components of non-second harmonic components; and filtering other harmonic components in the differential mode signal to obtain an alternating current signal. According to the embodiment of the application, the influence of the environmental variable on the signal can be eliminated.
Description
Technical Field
The present application belongs to the field of signal processing technologies, and in particular, to a signal processing method and apparatus, an electronic device, and a computer storage medium.
Background
The direct current heavy current measurement technology is widely applied to industrial production and scientific research: industries such as direct-current high-voltage transmission, metal electrolysis, high-speed rail locomotives, electric vehicles and the like need to accurately measure direct-current large current so as to measure line loss and current efficiency or perform safety monitoring and electric energy metering. The direct current large current is accurately and effectively measured, and needs to be reliably traced to the national measurement standard. The magnitude and accuracy of direct current measurements in industrial production and scientific research vary widely, with currents from hundreds of amperes to hundreds of thousands of amperes, and accuracies from one percent to one part per million; at present, a magnetic modulation principle sensor is mainly adopted to realize high-precision measurement, but due to the influence of high-current strong magnetic field interference and various parameters under an actual working state, the accuracy of a current sensor for field measurement based on a magnetic modulation technology can reach one millionth in a laboratory, but field test is difficult to break through one millionth. The development of industrial technology is severely limited, and the traceability of field metering standards in the industries such as national defense, military industry, electric power and the like is influenced. There are two major technical difficulties: firstly, the strong magnetic field generated by the heavy current bus has serious interference influence; and the second is lack of a solution under actual large current and actual interference magnetic field.
Therefore, how to eliminate the influence of the environmental variables on the signal is a technical problem that needs to be solved urgently by those skilled in the art.
Disclosure of Invention
Embodiments of the present application provide a signal processing method, a signal processing apparatus, an electronic device, and a computer storage medium, which are capable of eliminating an influence of an environmental variable on a signal.
In a first aspect, an embodiment of the present application provides a signal processing method, including:
acquiring an excitation square wave signal;
generating an induction signal by induction based on the excitation square wave signal;
amplifying the second harmonic component of the induction signal, and inhibiting other harmonic components of the induction signal to obtain a differential mode signal; wherein, the other harmonic components are harmonic components of non-second harmonic components;
and filtering other harmonic components in the differential mode signal to obtain an alternating current signal.
Optionally, the method further includes:
and carrying out phase-sensitive rectification on the alternating current signal to obtain a direct current signal.
Optionally, the phase-sensitive rectification is performed on the ac signal to obtain a dc signal, including:
the ac electrical signal is full-wave rectified under the condition that the same-frequency and same-phase signals are used as the reference, and a dc electrical signal is obtained.
Optionally, the method further includes:
and smoothing and filtering the direct current signal to obtain a stable direct current signal.
In a second aspect, an embodiment of the present application provides a signal processing apparatus, including:
the acquisition module is used for acquiring an excitation square wave signal;
the generating module is used for generating an induction signal in an induction mode based on the excitation square wave signal;
the amplification and suppression module is used for amplifying the second harmonic component of the induction signal and suppressing other harmonic components of the induction signal to obtain a differential mode signal; wherein, the other harmonic components are harmonic components of non-second harmonic components;
and the filtering module is used for filtering other harmonic components in the differential mode signal to obtain the alternating current signal.
Optionally, the apparatus further comprises:
and the phase-sensitive rectifying module is used for carrying out phase-sensitive rectification on the alternating current signal to obtain a direct current signal.
Optionally, the phase-sensitive rectifying module is configured to perform full-wave rectification on the ac electrical signal under a condition that a signal with the same frequency and the same phase is used as a reference to obtain a dc electrical signal.
Optionally, the apparatus further comprises:
and the smoothing filtering module is used for smoothing and filtering the direct current signal to obtain a stable direct current signal.
In a third aspect, an embodiment of the present application provides an electronic device, where the electronic device includes: a processor and a memory storing computer program instructions;
the processor, when executing the computer program instructions, implements a signal processing method as shown in the first aspect.
In a fourth aspect, the present application provides a computer storage medium, on which computer program instructions are stored, and when executed by a processor, the computer program instructions implement the signal processing method according to the first aspect.
The signal processing method, the signal processing device, the electronic equipment and the computer storage medium can eliminate the influence of the environmental variables on the signals. The signal processing method comprises the steps of obtaining an excitation square wave signal; generating an induction signal by induction based on the excitation square wave signal; amplifying the second harmonic component of the induction signal, and inhibiting other harmonic components of the induction signal to obtain a differential mode signal; wherein, the other harmonic components are harmonic components of non-second harmonic components; and filtering other harmonic components in the differential mode signal to obtain an alternating current signal. Therefore, the method amplifies the second harmonic component of the induction signal, inhibits and filters other harmonic components of the induction signal, and can eliminate the influence of the signal on the environmental variable.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a signal processing method according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a second harmonic detection circuit according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a phase-sensitive rectifying circuit according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a smoothing filter circuit according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a signal processing apparatus according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
Features and exemplary embodiments of various aspects of the present application will be described in detail below, and in order to make objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are intended to be illustrative only and are not intended to be limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
As is known in the background section, the signal is affected by environmental variables in the prior art. In order to solve the problems in the prior art, embodiments of the present application provide a signal processing method and apparatus, an electronic device, and a computer storage medium. First, a signal processing method provided in an embodiment of the present application is described below.
Fig. 1 shows a schematic flow chart of a signal processing method according to an embodiment of the present application. As shown in fig. 1, the main body of the signal processing method may be a field metering current sensor based on a magnetic modulation technology, and the method includes:
and S101, acquiring an excitation square wave signal.
And S102, generating an induction signal in an induction mode based on the excitation square wave signal.
S103, amplifying the second harmonic component of the induction signal, and suppressing other harmonic components of the induction signal to obtain a differential mode signal; wherein the other harmonic components are harmonic components other than the second harmonic component.
And S104, filtering other harmonic components in the differential mode signal to obtain an alternating current signal.
The method amplifies the second harmonic component of the induction signal, inhibits and filters other harmonic components of the induction signal, and can eliminate the influence of the signal on environmental variables.
In one embodiment, steps S103 and S104 are performed by a second harmonic detection circuit. The second harmonic detection circuit has a structure as shown in fig. 2, and the signal from the fluxgate induction coil is a pulse alternating up and down, and contains a second harmonic component and other harmonic components unrelated to the axial component of the magnetic field probe to be detected. The second harmonic component is a useful signal, and the other components are noise signals. The function of the resonant circuit is to improve the signal-to-noise ratio of the input end of the differential amplification circuit as much as possible, so that the differential amplification circuit can keep the accuracy of signal amplification. The output impedance of the fluxgate probe is mainly inductance, the induction coil has a resistance R2, and a capacitor C2 is added to enable the induction coil loop to form an RLC resonance loop. The resonance capacitor C2 is adjusted to have the resonance frequency of the whole circuit just above 2f 1-31.25 KHz, so that the frequency component of the signal 2f1 is amplified and other harmonic components of the signal are suppressed. The resonance is only related to L1, C2 and the resonance frequency f, and the resonance conditions are as follows:
wherein, f is the second harmonic frequency 2f1 ═ 31.25KHz, L1 is 1.4162mH, the resistance value R2 ═ 22.57 Ω, the ideal capacitance value C2 ═ 18.3nF is calculated, and the capacitance used in the actual circuit debugging process is 19.3 nF. The quality factor Q of the resonant circuit determines the frequency selectivity of the resonant circuit. The larger the Q value, the better the selectivity of the resonant circuit.
After the signal passes through the RLC resonance link, the induced electromotive forces at the two ends of the induction coil are extracted through the differential amplification circuit, so that the common mode rejection ratio can be effectively inhibited. Its output VO 2 (V1-V2); the fluxgate signal, the second harmonic signal and the noise after the differential amplification link are amplified. The center frequency is 2f1 and the noise can be filtered out in the band-pass filtering link, so that a useful second harmonic signal is obtained. In the embodiment, a six-order active band-pass filter circuit is adopted, the center frequency is 31.25KHz, and the band-pass filter circuit extracts and amplifies second harmonic signals, so that signal noise is effectively removed.
In one embodiment, the method further comprises: and carrying out phase-sensitive rectification on the alternating current signal to obtain a direct current signal. In one embodiment, phase-sensitive rectifying an ac signal to obtain a dc signal comprises: the ac electrical signal is full-wave rectified under the condition that the same-frequency and same-phase signals are used as the reference, and a dc electrical signal is obtained. The phase-sensitive rectification of the alternating current signal can be performed by a phase-sensitive rectification circuit, which has a schematic structural diagram as shown in fig. 3, and the phase-sensitive rectification is to perform full-wave rectification on a periodic alternating signal under the condition that a signal with the same frequency and the same phase is taken as a reference, and determine the amplitude of the signal through smoothing filtering. The other function of the phase-sensitive detection circuit is to completely eliminate the influence of odd harmonics. In this embodiment, the band-pass filtered fluxgate signal requires phase sensitive detection. Although in the oscillating excitation circuit, the f1 frequency square wave is generated in phase with the 2f1 frequency square wave. But the phase of the band-pass filtered fluxgate signal is not synchronized with the phase of the reference square wave signal of the frequency 2f 1. If the two signals are directly multiplied, the phase-sensitive detection efficiency is very low, and the frequency-multiplied reference signal needs to be phase-shifted to be synchronous with the fluxgate signal after the band-pass filtering. The embodiment designs a phase-sensitive detector circuit with adjustable input signal phase as shown in fig. 3. The double retriggerable monostable trigger in the circuit adopts a CD4098 chip. The analog switch uses a CD4053 chip with a 2-channel analog switch. The monostable trigger is externally connected with an RC (resistor-capacitor) network and can be used for adjusting pulse delay and pulse width. An external resistance-capacitance network of a monostable trigger of the CD4098 is used for adjusting the pulse width of a reference signal (namely, the resistance value of R14 in the figure 3 is adjusted), and the adjusted pulse width is equal to the angle needing phase shifting; then, the falling edge of the pulse is used to trigger another monostable flip-flop of the CD4098, and an RC resistance-capacitance network externally connected with the monostable flip-flop is adjusted (i.e., the magnitude of R15 in fig. 3 is adjusted), so that the frequency and the phase of the output pulse of the RC resistance-capacitance network are consistent with the frequency and the phase of the phase-sensitive detection input signal, and then the square wave signal output by the pin 10 in the CD4098 is consistent with the frequency and the phase of the phase-sensitive detection input signal. The phase-sensitive detection input signal is simultaneously input into two channels of the CD4053, and the square wave signal output by the CD4098 is used for controlling two switches of the CD4053 channel analog switch. When the square wave signal is at a high level, one of the analog switches is closed; when the square wave signal is low level, the other analog switch is closed, so that the phase-sensitive detection input signal achieves the double half-wave rectification effect at the output ends of the two channels (namely pins 14 and 15 of CD 4053).
In one embodiment, the method further comprises: and smoothing and filtering the direct current signal to obtain a stable direct current signal. In one embodiment, smoothing the dc signal may be performed by a smoothing circuit, which is configured as shown in fig. 4, and the double half-wave rectified signal cannot be directly detected, and needs to be converted into a dc signal. The circuit is an operational amplifier externally connected with an RC (resistor-capacitor) network and has the function of differential smooth filtering. The two signals are respectively connected to the non-inverting terminal and the inverting terminal of the operational amplifier to output direct current analog signals. The magnetic field intensity of the axial component of the fluxgate probe is changed, and the output direct current signal is found to change along with the change of the magnetic field intensity.
Fig. 5 shows a schematic structural diagram of a signal processing apparatus provided in an embodiment of the present application. As shown in fig. 5, the signal processing apparatus includes:
an obtaining module 501, configured to obtain an excitation square wave signal;
a generating module 502, configured to generate an induction signal by induction based on the excitation square wave signal;
the amplification suppression module 503 is configured to amplify a second harmonic component of the sensing signal, and suppress other harmonic components of the sensing signal to obtain a differential mode signal; wherein, the other harmonic components are harmonic components of non-second harmonic components;
and the filtering module 504 is configured to filter other harmonic components in the differential-mode signal to obtain an alternating-current signal.
In one embodiment, the apparatus further comprises: and the phase-sensitive rectifying module is used for carrying out phase-sensitive rectification on the alternating current signal to obtain a direct current signal.
In one embodiment, the phase-sensitive rectifying module is configured to perform full-wave rectification on the ac electrical signal to obtain a dc electrical signal under a condition that a signal having the same frequency and the same phase is used as a reference.
In one embodiment, the apparatus further comprises:
and the smoothing filtering module is used for smoothing and filtering the direct current signal to obtain a stable direct current signal.
Each module/unit in the apparatus shown in fig. 5 has a function of implementing each step in fig. 1, and can achieve the corresponding technical effect, and for brevity, the description is not repeated here.
Fig. 6 shows a schematic structural diagram of an electronic device provided in an embodiment of the present application.
The electronic device may comprise a processor 601 and a memory 602 in which computer program instructions are stored.
Specifically, the processor 601 may include a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or may be configured to implement one or more Integrated circuits of the embodiments of the present Application.
In one example, the Memory 602 may be a Read Only Memory (ROM). In one example, the ROM may be mask programmed ROM, programmable ROM (prom), erasable prom (eprom), electrically erasable prom (eeprom), electrically rewritable ROM (earom), or flash memory, or a combination of two or more of these.
The processor 601 realizes any one of the signal processing methods in the above embodiments by reading and executing computer program instructions stored in the memory 602.
In one example, the electronic device may also include a communication interface 603 and a bus 610. As shown in fig. 6, the processor 601, the memory 602, and the communication interface 603 are connected via a bus 610 to complete communication therebetween.
The communication interface 603 is mainly used for implementing communication between modules, apparatuses, units and/or devices in the embodiments of the present application.
The bus 610 includes hardware, software, or both to couple the components of the electronic device to one another. By way of example, and not limitation, a bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hypertransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an infiniband interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a video electronics standards association local (VLB) bus, or other suitable bus or a combination of two or more of these. Bus 610 may include one or more buses, where appropriate. Although specific buses are described and shown in the embodiments of the application, any suitable buses or interconnects are contemplated by the application.
In addition, the embodiment of the application can be realized by providing a computer storage medium. The computer storage medium having computer program instructions stored thereon; the computer program instructions, when executed by a processor, implement any of the signal processing methods of the above embodiments.
It is to be understood that the present application is not limited to the particular arrangements and instrumentality described above and shown in the attached drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present application are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications, and additions or change the order between the steps after comprehending the spirit of the present application.
The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of the present application are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.
Aspects of the present application are described above with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions/acts specified in the flowchart and/or block diagram block or blocks. Such a processor may be, but is not limited to, a general purpose processor, a special purpose processor, an application specific processor, or a field programmable logic circuit. It will also be understood that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware for performing the specified functions or acts, or combinations of special purpose hardware and computer instructions.
As described above, only the specific embodiments of the present application are provided, and it can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the module and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present application, and these modifications or substitutions should be covered within the scope of the present application.
Claims (10)
1. A signal processing method, comprising:
acquiring an excitation square wave signal;
generating an induction signal by induction based on the excitation square wave signal;
amplifying the second harmonic component of the induction signal, and inhibiting other harmonic components of the induction signal to obtain a differential mode signal; wherein the other harmonic components are harmonic components other than the second harmonic component;
and filtering the other harmonic components in the differential mode signal to obtain an alternating current signal.
2. The signal processing method of claim 1, further comprising:
and carrying out phase-sensitive rectification on the alternating current signal to obtain a direct current signal.
3. The signal processing method of claim 2, wherein the phase-sensitive rectifying the ac electrical signal to obtain a dc electrical signal comprises:
and under the condition that the signals with the same frequency and the same phase are taken as reference, full-wave rectification is carried out on the alternating current signal to obtain the direct current signal.
4. The signal processing method of claim 2, further comprising:
and carrying out smooth filtering on the direct current signal to obtain a stable direct current signal.
5. A signal processing apparatus, characterized by comprising:
the acquisition module is used for acquiring an excitation square wave signal;
the generating module is used for generating an induction signal in an induction mode based on the excitation square wave signal;
the amplification and suppression module is used for amplifying the second harmonic component of the induction signal and suppressing other harmonic components of the induction signal to obtain a differential mode signal; wherein the other harmonic components are harmonic components other than the second harmonic component;
and the filtering module is used for filtering the other harmonic components in the differential mode signal to obtain an alternating current signal.
6. The signal processing apparatus of claim 5, wherein the apparatus further comprises:
and the phase-sensitive rectifying module is used for carrying out phase-sensitive rectification on the alternating current signal to obtain a direct current signal.
7. The signal processing apparatus of claim 6, wherein the phase-sensitive rectifying module is configured to perform full-wave rectification on the ac electrical signal to obtain the dc electrical signal based on a signal having the same frequency and the same phase.
8. The signal processing apparatus of claim 6, wherein the apparatus further comprises:
and the smoothing filtering module is used for smoothing and filtering the direct current signal to obtain a stable direct current signal.
9. An electronic device, characterized in that the electronic device comprises: a processor and a memory storing computer program instructions;
the processor, when executing the computer program instructions, implements a signal processing method as claimed in any one of claims 1-4.
10. A computer storage medium having computer program instructions stored thereon which, when executed by a processor, implement the signal processing method of any one of claims 1 to 4.
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| CN113962122A (en) * | 2021-09-30 | 2022-01-21 | 北京智芯仿真科技有限公司 | Method and system for determining full-wave electromagnetic simulation low-frequency reference frequency point of integrated circuit |
| CN114607363A (en) * | 2022-03-22 | 2022-06-10 | 电子科技大学 | Common mode rejection method for electromagnetic induction logging |
| CN116223909A (en) * | 2022-11-18 | 2023-06-06 | 南方电网数字电网研究院有限公司 | Reconstruction method, reconstruction device, reconstruction server and storage medium for superimposed signals |
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Application publication date: 20210618 |