CN107768119A - A kind of EHV power transformer active noise reduction system - Google Patents
A kind of EHV power transformer active noise reduction system Download PDFInfo
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- CN107768119A CN107768119A CN201711060948.6A CN201711060948A CN107768119A CN 107768119 A CN107768119 A CN 107768119A CN 201711060948 A CN201711060948 A CN 201711060948A CN 107768119 A CN107768119 A CN 107768119A
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- signal
- noise reduction
- preamplifier
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/33—Arrangements for noise damping
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/109—Compressors, e.g. fans
Abstract
A kind of EHV power transformer active noise reduction system, the vibrating sensor patch of its vibration signals collecting module is on the transformer, the vibration signal for gathering transformer shell inputs audio chip as reference signal, the signal of vibrating sensor output by the preamplifier of adjustable gain；Sound pressure sensor is placed on target noise reduction region, and the signal of sound pressure sensor output inputs audio chip by preamplifier, the wave filter of adjustable gain；Audio chip acquisition noise signal transfers data to DSP Processor after carrying out A/D conversions.DSP Processor receives the data of audio chip, and data are transmitted into audio chip, data input power amplifier after D/A is changed after adaptive filter algorithm is handled, and driving loudspeaker produce noise reduction sound, cancelled out each other with transformer noise, realize active noise reduction.
Description
Technical field
The present invention relates to a kind of transformer noise processing system, more particularly to a kind of EHV power transformer active noise reduction
System.
Background technology
With the expansion of power network scale, increasing large-scale power transformer is arranged near house and public place,
Its caused noise drastically influence the work and life of staff and surrounding resident in station.Transformer body noise mainly comes
Core vibration when coming from iron core excitation caused by silicon steel sheet magnetostriction, with 2 times of supply frequency for fundamental frequency.Due to material unshakable in one's determination
Reason, the noise spectrums such as the difference of housing magnetic circuit length non-linear and along iron core of material also include the integer frequency of fundamental frequency.
Therefore, for the power supply that frequency is 50Hz, transformer noise is the low frequency that frequency is concentrated mainly on 100Hz and its integer frequency
Noise.Low-frequency noise can be detrimental to health, or even influence the development of pregnant woman foetus.
The problem of transformer noise control turns into people's growing interest.Transformer noise reduction is divided into passive noise control and active noise reduction
Two ways.Passive noise control generally use barrier isolation noise has significant noise reduction to high-frequency noise, to low-frequency noise
Noise reduction is undesirable.Main cause is longer for the wavelength of low-frequency noise, and wavelength about 3.4m, passive as corresponding to 100Hz noises
The noise reduction that noise reduction will produce needs very big size, and which increase the cost of passive noise control and technical difficulty.Have at present
Source noise reduction system mainly includes controller, sound pressure sensor and secondary sound source, generally using two kinds of feedforward control and feedback control
Control method.Feedback control produces control signal by being filtered to error signal, it is not necessary to extra reference-input signal, exists
Stability problem.The difference of feedforward control and feedback is that feedforward control system obtains reference signal first, reference
Signal is related to primary sound source, strengthens the stability of active noise reduction system with this.So the accuracy of reference signal is feedforward control
The key issue of mode processed, it is the important prerequisite for ensureing good noise reduction.
There is the patent of some transformer active noise reductions both at home and abroad, but in terms of noise reduction and the stability of a system still
So there are problems that：
(1) active noise reduction system of feed forward control method is used at present, and reference signal is obtained by sound pressure sensor, caused
Noise in reference signal inevitably containing fan for cooling transformer noise, ambient noise and secondary sound source feedback.Pass through
Low pass filter can filter out the high fdrequency component in cooling fan noise and ambient noise, be made an uproar it can be difficult to filtering out cooling fan
The feedback noise of low frequency component and secondary sound source in sound, ambient noise；
(2) at present the reference signal that collects of sound pressure sensor of active noise reduction system, it is necessary to first pass around filtering process,
Input control circuit again, and the delayed-action of wave filter is unfavorable for carrying out real-time noise-reducing；
(3) the faint noise signal that sensor collects needs to input at next stage circuit after being amplified
Reason.Traditional active noise reduction system uses the amplifier of fixed gain, and its multiplication factor is fixed.When noise intensity is smaller
When, the noise signal amplitude of fixed gain amplifier output is relatively low；When noise intensity is larger, fixed gain amplifier output
Noise signal amplitude is higher, may exceed the range of A/D sample circuits, make the stability of active noise reduction system relatively low.
The content of the invention
In order to overcome the above-mentioned deficiency of prior art, the present invention proposes a kind of EHV power transformer active noise reduction system
System.Transformer shell vibration signal is gathered by vibrating sensor and is used as reference signal, excludes cooling fan noise, ambient noise
With the interference of secondary sound source feedback noise, purer reference signal is obtained, saves filter circuit.Pass through the preposition of adjustable gain
The signal amplitude of amplifying circuit control collection is all the time within the limits prescribed.The present invention can save active noise reduction system cost,
Improve conversion speed, improve the stability of system.
To achieve these goals, the present invention adopts the following technical scheme that：
The EHV power transformer active noise reduction system includes vibration signals collecting module, sound pressure signal collection mould
Module occurs for block, signal processing module and secondary sound source.Vibration signals collecting module and acoustic pressure signal acquisition module respectively with letter
Number processing module is connected, and signal processing module occurs module with secondary sound source and is connected.Vibration signals collecting module gathers transformer
Vibration simulation signal, sound pressure signal acquisition module collection acoustic pressure analog signal, by audio signal wire by the vibration simulation of collection
Signal harmony pressure analog signal delivers to signal processing module and is AD converted processing, and the signal after processing passes through after carrying out DA conversions
Audio signal wire delivers to secondary sound source and module occurs, and secondary sound source occurs module and is made up of power amplifier and loudspeaker, the letter after DA processing
Number loudspeaker are driven to send the opposite sound wave of amplitude same phase by power amplifier, the noise sent with primary sound source carries out cancellation, reaches
To noise reduction.
The vibration signals collecting module includes vibrating sensor and the first preamplifier.Vibrating sensor is pasted onto change
On depressor housing, the vibration data of transformer shell is gathered as reference signal.The input of first preamplifier and vibration
Sensor connects, and the signal of amplification vibrating sensor collection, the vibration simulation signal most gathered at last is by the first preamplifier
Output end be sent to signal processing module.
The sound pressure signal acquisition module includes sound pressure sensor, the second preamplifier and wave filter.Sound pressure sensor
Target noise reduction region is placed on, gathers the noise signal after noise reduction as error signal；The input of second preamplifier with
Sound pressure sensor connects, the noise signal of amplification sound pressure sensor collection；The input of wave filter and the second preamplifier
Output end connects, and filters out the high fdrequency component in the noise signal of sound pressure sensor collection, the acoustic pressure simulation letter most collected at last
Number signal processing module is delivered to by the output end of wave filter.
The signal processing module includes audio chip and DSP Processor.The input of audio chip and wave filter it is defeated
Go out end connection, A/D samplings are carried out to filtered sound pressure sensor signal；The output end of DSP Processor and audio chip connects；
The DSP Processor is handled reference signal and error signal, and the de-noising signal after processing is inputted into the audio chip
D/A conversions are carried out, most signal is delivered to secondary sound source generation module at last.
Module, which occurs, for the secondary sound source includes power amplifier and loudspeaker.The output end and power amplifier of audio chip
Input be directly connected to, de-noising signal is amplified；The output end of power amplifier is connected with loudspeaker, finally drives loudspeaker
Produce noise reduction sound.
The vibrating sensor is the sensor array of multiple acceleration transducer compositions, wherein each acceleration transducer
It is fixed on one block of magnet.Vibrating sensor is equidistantly pasted onto on transformer shell, directly gathers the vibration of transformer shell
Signal is as reference signal.
The sound pressure sensor be multiple condenser type MIC sensor groups into sensor array, sound pressure sensor is located at mesh
Noise reduction region is marked, acquisition noise signal is as error signal.
Described preamplifier uses MAX9814 chips.
The wave filter uses NE5532 operational amplifiers, after 3rd resistor and the 4th resistant series and the 3rd capacitance connection
Low-pass first order filter is formed, signal is returned by the 4th capacitive feedback after the amplification of NE5532 operational amplifiers, and now the
Four resistance and the 3rd electric capacity form a low-pass first order filter again, and signal again passes by defeated after NE5532 operational amplifiers amplify
Go out.
The DSP Processor is 6000 series DSP chips of TI companies.
The loudspeaker are the array of multiple loudspeaker composition.
The DSP Processor is handled reference signal and error signal using adaptive filter algorithm, after processing
De-noising signal input audio chip carry out D/A conversions.The output end of the audio chip and the input of power amplifier connect
Connect, de-noising signal is amplified, the output end of power amplifier is connected with loudspeaker, and driving loudspeaker produce noise reduction sound.
Described vibrating sensor, sound pressure sensor, preamplifier, wave filter, audio chip, DSP Processor, power amplifier
Signal wire between mediant trumpet uses coaxial tone frequency channel wire, and joint is RCA.
The present invention gathers transformer shell vibration signal by vibrating sensor, as reference signal, excludes transformer and dissipates
The interference of Hot-air fan noise and ambient noise to measurement, while filter circuit is saved, improve conversion speed.Can using gain
Preamplifier is adjusted to automatically adjust the gain of the reference signal of vibrating sensor collection and the error signal of sound pressure sensor collection,
Signal is amplified in defined scope, improve the stability of noise reduction system
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the preamplifier circuit figure of the present invention；
Fig. 3 is the filter circuit figure of the present invention；
Fig. 4 is the vibrating sensor structure chart of the present invention；
Fig. 5 is more than output result figure during limit value for the pre-amplification circuit signal amplitude of fixed gain；
Fig. 6 is the pre-amplification circuit output result figure of adjustable gain of the present invention；
Fig. 7 is the extra-high voltage transformer hull vibration result of spectrum analysis figure of vibrating sensor collection；
Fig. 8 is the extra-high voltage transformer noise spectrum analysis result figure of sound pressure sensor collection.
Embodiment
The present invention is further illustrated with reference to the accompanying drawings and detailed description.
As shown in figure 1, the EHV power transformer active noise reduction system includes vibration signals collecting module 1, acoustic pressure
Module 4 occurs for signal acquisition module 2, signal processing module 3, secondary sound source.Vibration signals collecting module 1 and acoustic pressure signal acquisition
Module 2 is connected with signal processing module 3 respectively；Signal processing module 3 occurs module 4 with secondary sound source and is connected；Vibration signal is adopted
Collect module 1 and gather transformer vibration simulation signal, sound pressure signal acquisition module 2 gathers acoustic pressure analog signal, passes through audio signal
The vibration simulation signal harmony pressure analog signal of collection is delivered to signal processing module 3 and is AD converted processing by line, after processing
Signal, which carries out delivering to secondary sound source by audio signal wire after DA conversions again, occurs module 4.
Vibration signals collecting module includes including the preamplifier 6 of vibrating sensor 5 and first；The vibrating sensor 5
It is pasted onto on transformer shell, gathers the vibration data of transformer shell as reference signal；The input of first preamplifier 6
End be connected with the vibrating sensor 5, amplification vibrating sensor 5 collection signal, the vibration simulation signal most gathered at last by
The output end of first preamplifier 6 is sent to signal processing module 3.
Sound pressure signal acquisition module includes sound pressure sensor 7, the second preamplifier 8, wave filter 9.Sound pressure sensor 7 is put
Put in target noise reduction region, gather the noise signal after noise reduction as error signal；The input and sound of second preamplifier 8
Pressure sensor 7 connects, the noise signal that amplification sound pressure sensor 7 gathers；The input of the wave filter 9 and described second preposition
The output end connection of amplifier 7, filters out the high fdrequency component in the noise signal of the collection of sound pressure sensor 7, most collects at last
Acoustic pressure analog signal delivers to signal processing module 3 by the output end of wave filter 9.
Signal processing module 3 includes audio chip 10, DSP Processor 11, the input of audio chip 10 and the wave filter 9
Output end connection, to filtered sound pressure sensor signal carry out A/D samplings；DSP Processor 11 is defeated with audio chip 10
Go out end connection；The DSP Processor 11 is handled reference signal and error signal, and the de-noising signal after processing is inputted into institute
State audio chip 10 and carry out D/A conversions, most signal is delivered to secondary sound source generation module 4 at last.
Module 4, which occurs, for secondary sound source includes power amplifier 12 and loudspeaker 13, the output end of the audio chip 10 and institute
The input for stating power amplifier 12 is directly connected to, and de-noising signal is amplified；The output end of the power amplifier 12 with
The loudspeaker 13 connect, final to drive loudspeaker 13 to produce noise reduction sound.
The vibrating sensor 5 is the sensor array of multiple acceleration transducer compositions, wherein each acceleration sensing
Device is all fixed on one block of magnet, as shown in Figure 4.
The first described preamplifier 6 is gain adjustable amplifier, and it can be according to the amplitude reality of input noise signal
When adjust the gain of amplifier, its circuit theory diagrams is as shown in Fig. 2 the core of the first preamplifier 6 is a piece of MAX9814 increases
Beneficial adjustable operational amplifier, signal input the output of the 6th pin from the 8th pin, and the voltage can change for changing MICBIAS ends is whole
The multiplication factor of individual circuit.When the noise signal amplitude of input is less than setting value, DSP Processor control relay makes amplification electric
The MICBIAS ports access high level on road, at this moment amplifying circuit is plus and blowup pattern, when the noise signal amplitude of input is big
When setting value, DSP Processor control relay makes the MICBIAS ports of amplifying circuit access low level, at this moment amplifying circuit
For low gain amplification mode, the signal amplitude that sample circuit gathers can be made all the time defined by the amplifier of adjustable gain
In the range of.
First preamplifier 6 is identical with the structure of the second preamplifier 8.As shown in Fig. 2 the first preamplifier 6
In the MAX9814 chips of the second preamplifier 8, it is grounded after the 1st pin serial connection 470nF the first electric capacity C17, the 2nd pin,
5th pin, the 10th pin meet VCC, are grounded after the 3rd pin serial connection 2.2uF the second electric capacity C2, and the 4th pin and the 11st pin are
The high-pass filter series connection of empty pin, the 6th pin and the 5th electric capacity C5, the 6th resistance R6 composition, the 7th pin and the 9th pin connect
Ground, connected with preamplifier input after the 8th pin serial connection 0.1uF the 7th electric capacity C7, the 12nd pin serial connection 0.47uF's
It is grounded, is connected after the 13rd pin serial connection 1M Ω the 5th resistance R5 with preamplifier input, the 14th draws after 6th electric capacity C6
Pin is connected on the midpoint of the bleeder circuit of first resistor R1 and second resistance R2 compositions.When the noise signal amplitude of input is less than
During setting value, DSP Processor control MICBIAS port access high level, amplifying circuit is set to work in plus and blowup pattern；When
When the noise signal amplitude of input is more than setting value, DSP Processor control MICBIAS port access low levels, make amplifying circuit
Work in low gain amplification mode.
Described sound pressure sensor 7 be multiple condenser type MIC sensor groups into sensor array.
Described filter circuit operational amplifier NE5532 and two low-pass first order filters as shown in figure 3, be made up of.
Connected after 3rd resistor R3 and the 4th resistance R4 series connection with the 3rd electric capacity C3, form low-pass first order filter, signal passes through computing
Fed back after amplifier NE5532 amplifications by the 4th electric capacity C4 of parallel connection, now the 4th resistance R4 and the 3rd electric capacity C3 and structure
Into a low-pass first order filter, signal exports after again passing by operational amplifier NE5532 amplifications.When noise signal passes through filter
The high fdrequency component in noise signal can be filtered out during ripple device.
The major function of described audio chip 10 is to realize A/D conversions and D/A conversions, and the noise signal of simulation is changed
DSP is sent into data signal, data signal after DSP is handled is received and is converted into analog signal input power amplifier.
The described main function of power amplifier 7 is to be amplified faint de-noising signal, then drives loudspeaker 13 to send out
Sound, the output end of the input connection audio chip 10 of power amplifier 12, the output end connection loudspeaker 13 of power amplifier 12
Input.
Described loudspeaker 13 are the execution units of whole system, and it plays the de-noising signal after power amplifier amplifies
Out cancelled out each other with transformer noise.
Described DSP Processor 11 is the control unit of whole system, and it controls the sampling of audio chip 10, to receiving
Signal carry out adaptive-filtering processing, and control audio chip 10 play de-noising signal, realize active noise reduction.
Described vibrating sensor 5, sound pressure sensor 7, the first preamplifier 6, the second preamplifier 8, wave filter
9th, the signal wire between audio chip 10, DSP Processor 11, power amplifier 12 and loudspeaker 13 uses coaxial tone frequency channel wire, connects
Head is RCA joints, and signal can be made smoothly to be transmitted in the highfield of ultra-high voltage transformer station, improve the anti-interference energy of system
Power.
Output signal is such as when signal amplitude is more than signal limit value, after two preamplifiers 6,8 by fixed gain
Shown in Fig. 5.It is controlled using the preamplifier 6,8 of adjustable gain, the signal collected is after preamplifier 6,8
Output result is as shown in Figure 6；As can be seen that when signal amplitude is more than signal limit value, gone out using the amplifier signal of fixed gain
Existing distortion, and the preamplifier 6,8 of adjustable gain of the present invention is used, signal is undistorted.
Vibration signal normalized spatial spectrum analysis result such as Fig. 7 at the extra-high voltage transformer housing point of vibrating sensor collection
It is shown.Signal shown in Fig. 7 is directly collection, amplified, the vibration signal of non-filtered processing.Signal is concentrated mainly on 100Hz
And its frequency multiplication, transformer body signal is less than 600Hz, based on 200Hz.The extra-high voltage transformer noise of sound pressure sensor collection
Shown in result of spectrum analysis Fig. 8.Noise signal of the signal to gather, after amplification and filtering process shown in Fig. 8, wave filter filter out
It is more than 1kHz radio-frequency component, but broadband noise caused by 1kHz scopes internal fan and environment is still present, as a result reflect
Be transformer body noise, fan noise and ambient noise comprehensive function.
Claims (8)
- A kind of 1. EHV power transformer active noise reduction system, it is characterised in that：Described EHV power transformer is active Noise reduction system includes vibration signals collecting module (1), sound pressure signal acquisition module (2), signal processing module (3) and secondary sound source Generation module (4)；Vibration signals collecting module (1) and acoustic pressure signal acquisition module (2) respectively with signal processing module (3) phase Even；Signal processing module (3) occurs module (4) with secondary sound source and is connected；Vibration signals collecting module (1) collection transformer vibration Analog signal, sound pressure signal acquisition module (2) collection acoustic pressure analog signal, vibration simulation signal harmony pressure analog signal pass through sound Frequency signal wire delivers to signal processing module (3) and is AD converted processing, and the signal after processing is believed after carrying out DA conversions by audio Number line delivers to secondary sound source and module (4) occurs.
- 2. EHV power transformer active noise reduction system as claimed in claim 1, it is characterised in that：The vibration signal is adopted Collection module (1) includes vibrating sensor (5) and the first preamplifier (6)；The vibrating sensor (5) is pasted onto transformer shell On body, the vibration data of transformer shell is gathered as reference signal；The input of first preamplifier (6) and the vibration Sensor (5) connects, and the signal of amplification vibrating sensor (5) collection, the vibration simulation signal of collection is sent into signal transacting Module (3).
- 3. EHV power transformer active noise reduction system as claimed in claim 1, it is characterised in that：Described sound pressure signal Acquisition module includes sound pressure sensor (7), the second preamplifier (8) and wave filter (9)；Sound pressure sensor (7) is placed on mesh Noise reduction region is marked, gathers the noise signal after noise reduction as error signal；The input of second preamplifier (8) passes with acoustic pressure Sensor (7) connects, the noise signal of amplification sound pressure sensor (7) collection；Before the input and described second of the wave filter (9) The output end connection of amplifier (8) is put, the high fdrequency component in the noise signal of sound pressure sensor (7) collection is filtered out, most adopts at last The acoustic pressure analog signal collected delivers to signal processing module (3) by the output end of wave filter (9).
- 4. EHV power transformer active noise reduction system as claimed in claim 1, it is characterised in that：Described signal transacting Module (3) includes audio chip (10) and DSP Processor (11)；The input of audio chip (10) and the wave filter (9) and the The output end connection of one preamplifier (6), A/D is carried out to filtered sound pressure sensor signal and vibration sensor signal and adopted Sample；DSP Processor (11) is connected with the output end of audio chip (10)；The DSP Processor (11) is to reference signal and error Signal is handled, and the de-noising signal after processing is inputted into the audio chip (10) carries out D/A conversions, and most signal conveys at last Module (4) occurs to secondary sound source.
- 5. EHV power transformer active noise reduction system as claimed in claim 1, it is characterised in that：Described secondary sound source Generation module (4) includes power amplifier (12) and loudspeaker (13)；The output end of the audio chip (10) is put with the power The input of big device (12) is directly connected to, and de-noising signal is amplified；The output end of the power amplifier (12) with it is described Loudspeaker (13) connect, and finally drive loudspeaker (13) to produce noise reduction sound.
- 6. the EHV power transformer active noise reduction system as described in claim any one of 1-5, it is characterised in that：Described EHV power transformer active noise reduction system is using the transformer shell vibration signal that vibrating sensor (5) gathers as with reference to letter Number, it is used as error signal by the use of the signal after the noise reduction of sound pressure sensor (7) collection target noise reduction region；Reference signal passes through gain Adjustable first preamplifier (6) input DSP Processor (11), error signal pass through the second preamplifier of adjustable gain (8) and wave filter (9) inputs DSP Processor (11)；DSP Processor (11) is using adaptive filter algorithm to the reference after amplification Signal and error signal are handled, and after de-noising signal input power amplifier (12) amplification after processing, drive loudspeaker (13) noise reduction sound is produced, is cancelled out each other with transformer noise, realizes active noise reduction.
- 7. EHV power transformer active noise reduction system as claimed in claim 2 or claim 3, it is characterised in that：Described first In preamplifier (6) and the second preamplifier (8), the 1st pin serial connection 470nF of its MAX9814 chip the first electric capacity It is grounded after C17, the 2nd pin, the 5th pin and the 10th pin meet VCC, are grounded after the 3rd the second electric capacity of pin serial connection C2, the 4th pin It is empty pin with the 11st pin, the high-pass filter that the 6th pin and the 5th electric capacity C5, the 6th resistance R6 are formed is connected, the 7th pin It is grounded with the 9th pin, is connected with the input of preamplifier after the electric capacity C7 of the 8th pin serial connection the 7th, the 12nd pin serial connection the It is grounded after six electric capacity C6, is connected after the resistance R5 of the 13rd pin serial connection the 5th with the input of preamplifier, the connection of the 14th pin On the midpoint for the bleeder circuit that first resistor R1 and second resistance R2 is formed；When the noise signal amplitude of input is less than setting value When, DSP Processor control MICBIAS port access high level, preamplifier is worked in plus and blowup pattern；Work as input Noise signal amplitude when being more than setting value, DSP Processor control MICBIAS port access low levels, amplifying circuit is worked In low gain amplification mode.
- 8. EHV power transformer active noise reduction system as claimed in claim 3, it is characterised in that：Described wave filter by Operational amplifier NE5532 and two low-pass first order filter compositions；After 3rd resistor R3 and the 4th resistance R4 series connection and the 3rd is electric Holding C3 connections, form low-pass first order filter, signal is fed back after NE5532 amplifies by the 4th electric capacity C4 of parallel connection, Now the 4th resistance R4 and the 3rd electric capacity C3 forms a low-pass first order filter again, and signal again passes by operational amplifier Exported after NE5532 amplifications；Filtered when the low-pass first order filter that noise signal is made up of the 4th resistance R4 and the 3rd electric capacity C3 Except the high fdrequency component in noise signal.
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| CN110246482A (en) * | 2019-06-12 | 2019-09-17 | 深圳供电局有限公司 | Denoising device and its control method |
| CN110277084A (en) * | 2019-07-10 | 2019-09-24 | 上海博纳杰陈电气有限公司 | A kind of transformer silencer using active noise reduction |
| WO2020024334A1 (en) * | 2018-08-01 | 2020-02-06 | 中科振声（苏州）电子科技有限公司 | Smart vibration noise responding system and smart vibration noise responding method |
| CN111063528A (en) * | 2019-11-25 | 2020-04-24 | 深圳供电局有限公司 | Active noise reduction equipment of transformer and transformer noise on-line monitoring system |
| CN112652289A (en) * | 2020-12-11 | 2021-04-13 | 西安艾科特声学科技有限公司 | Fire fighting truck cab local space active noise control system and method |
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