CN109932603A - A kind of air conditioner electric control plate buzzer sounding detection method and circuit board - Google Patents
A kind of air conditioner electric control plate buzzer sounding detection method and circuit board Download PDFInfo
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- CN109932603A CN109932603A CN201910268564.6A CN201910268564A CN109932603A CN 109932603 A CN109932603 A CN 109932603A CN 201910268564 A CN201910268564 A CN 201910268564A CN 109932603 A CN109932603 A CN 109932603A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
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- 238000005070 sampling Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 14
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- 238000007620 mathematical function Methods 0.000 claims description 7
- 238000004458 analytical method Methods 0.000 claims description 5
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Abstract
The invention discloses a kind of air conditioner electric control plate buzzer sounding detection methods, obtain the audio signal that one section of superposition will be obtained when buzzer sounding by analyzing；Following result a: DC component is obtained by introducing Fourier transformation again, and a fundamental wave is primary, secondary, three times and higher hamonic wave；By microphone samples audio signal, then filtering out higher hamonic wave using second order passive bandpass filters obtains the fundamental wave of passband, amplifier is calculated by hardware amplifier again, waveform after amplifying sampling filter, again the AD conversion unit of Waveform Input microprocessor is converted into digital quantity signal in real time and records maximum component value, it is compared within the unit time using maximum component value and preset numerical value, meet condition MCU control relay to be attracted, being unsatisfactory for condition, then relay is failure to actuate.The invention also discloses a kind of air conditioner electric control plate buzzer sounding detection circuit boards.The present invention, which solves, manually to listen sounding to be easy to produce to fail to judge, and is easy the defect interfered by environmental noise.
Description
Technical field
The present invention relates to air-conditioning equipment detection technique field more particularly to a kind of air conditioner electric control plate buzzer sounding detection sides
Method and circuit board.
Background technique
Air conditioner electric control plate needs to be powered to air conditioner electric control plate to detect its performance and other after production and processing is good
Whether various functions can meet the requirements of the customers.Wherein there is one in the detection process and needs to determine buzzer element on electric-controlled plate
Whether sounding is normal, and detection mode, which uses, at present manually listens whether buzzer pronounces normally with ear.Major defect: hair is manually listened
Acoustic capacitance, which is also easy to produce, fails to judge, and is easy to be interfered by environmental noise, and the buzzer that different people hears pronounces the quantifying of none standard.
Accordingly, be badly in need of at present one kind be not easy to fail to judge, objective air conditioner electric control plate buzzer sounding detection method and circuit board.
Summary of the invention
Technical problem to be solved by the present invention lies in provide one kind be not easy to fail to judge, objective air conditioner electric control plate buzzer hair
Sound detection method and circuit board.
The present invention solves above-mentioned technical problem using following technical scheme:
A kind of air conditioner electric control plate buzzer sounding detection method, this method includes below scheme:
S1, its mathematical function of the audio signal of one section of superposition will be obtained when buzzer sounding firstly, passing through analysis and obtaining
Model is y=sinx+1/2*sin 2x+1/3*sin 3x+1/4*sin 4x+ ..., according to the principle of Fourier space, period letter
Number can expand into constant and one group of the sum of SIN function and cosine function with common cycle；
S2, secondly, again by introduce Fourier transformation obtain following result for any one compounding period oscillating function y
(T) fourier series exploded representation is pressed are as follows: a DC component, a fundamental wave, first harmonic, second harmonic, triple-frequency harmonics, high order
Harmonic wave；
S3, finally, by using microphone samples in collective and filter circuit, then microphone samples audio signal uses
Second order passive bandpass filters filter out higher hamonic wave and obtain the fundamental wave of passband, then calculate amplifier, amplification sampling by hardware amplifier
The AD conversion unit of Waveform Input microprocessor is being converted into digital quantity signal in real time and is recording maximum by filtered waveform
Component value, be compared within the unit time using maximum component value and preset numerical value, the condition MCU of satisfaction passes through pin
It controls relay to be attracted, being unsatisfactory for condition, then relay is failure to actuate, to judge whether buzzer sounding is normal.
As one of preferred embodiment of the invention, the step S1 makes a concrete analysis of process are as follows:
Wherein ω=2 π/T；
N=0,1,2,3 ...；
N=1,2,3,4 ...；
At discontinuous point, following formula is set up:
A0/2 is the DC component of signal f (t)；
It enables
C1 is fundamental voltage amplitude, and cn is the amplitude of nth harmonic；C1 is sometimes referred to as the amplitude of first harmonic；A0/2 is sometimes referred to as 0
The amplitude of subharmonic.
As one of preferred embodiment of the invention, the microphone samples in collective and filter circuit include VCC5V, R16,
R10, R9, C4, C2, R14, MIC sound pick-up, C9, C7, R7, R5, R3, described VCC5V, R16, R10, R9, C4, C2 are sequentially connected in series
Connection, R14 the and MIC sound pick-up, C9, C7 and R7, R5, R3 one end be successively connected in parallel between R16 and R10, R10 and R9 it
Between, between R9 and C4, between C4 and C2, the end of C2, the other end is grounded, wherein the 2 pins ground connection of MIC sound pick-up.
As one of preferred embodiment of the invention, the R10, C9, R9, C7, R7, C4, R5, C2, R3 one second order of composition
Passive Pi type bandpass filter is filtered waveform so that only meeting the frequency of 4K Hz could pass through, and reaches filtering environmental
The interference of noise.
As one of preferred embodiment of the invention, the hardware amplifier calculates amplifier as LM358 integrated transporting discharging chip composition
Scaling circuit.
As one of preferred embodiment of the invention, the microphone samples in collective and filter circuit are disposed close to buzzing
The fixation position of device is come the frequency that issues and amplitude of vibration when capturing buzzer work.
The invention also discloses a kind of air conditioner electric control plate buzzer sounding detection circuit boards, when the circuit board is in detection work
When making, task is executed according to the testing process of air conditioner electric control plate buzzer sounding detection method.
The present invention compared with prior art the advantages of be: detection method of the invention is by placing detection circuit close to bee
Ring device fixation position come the frequency that issues and amplitude of vibration when capturing buzzer work by being used after being converted into analog voltage signal
Microprocessing unit determines whether buzzer work is normal and provides digital quantity signal by relay, solves and manually listens hair automatically
Acoustic capacitance, which is also easy to produce, fails to judge, and is easy the defect interfered by environmental noise.
Detailed description of the invention
Fig. 1 is the flow chart of the air conditioner electric control plate buzzer sounding detection method in embodiment；
Fig. 2 is the combined waveform figure in embodiment；
Fig. 3 is the mathematical function model waveform diagram of the pure sound in embodiment；
Fig. 4 is the combined sound mathematical function model waveform diagram in embodiment；
Fig. 5 is the whole detection circuit theory schematic diagram one in embodiment；
Fig. 6 is the whole detection circuit theory schematic diagram two in embodiment；
Fig. 7 is microphone samples in collective and filter circuit schematic diagram in embodiment；
Fig. 8 is the amplitude-frequency of the passive Pi type bandpass filter of second order in embodiment, phase-frequency characteristic functional image；
Fig. 9 is that have -5 decibels by frequency 4Khz to center using baud instrument actual measurement second-order bandpass filter in embodiment
Hinder figure；
Figure 10 is LM358 integrated transporting discharging chip composition amplification circuit diagram in embodiment；
Figure 11 is circuit board PCB schematic diagram in embodiment.
Specific embodiment
It elaborates below to the embodiment of the present invention, the present embodiment carries out under the premise of the technical scheme of the present invention
Implement, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to following implementation
Example.
Design principle of the invention:
Pass through the composition for analyzing the available audio of frequency spectrum of audio: including the following (amplitude of vibration, frequency, harmonic wave), one
Section audio is combined waveform such as Fig. 2 for having the sinusoidal signal of many different frequency difference amplitudes of vibration to stack up；
The mathematical function model of one pure sound is y=Asin ω x waveform such as Fig. 3；
And the sound that nature human ear is heard all is from multiple waveforms combination so the mathematical function mould of this sound
Type is y=sinx+1/2*sin 2x+1/3*sin 3x+1/4*sin 4x+ ...；As shown in Figure 4；
Buzzer on air conditioner electric control panel products its working principle is that by single-chip microcontroller provide the square wave of fixed 4K frequency come
Drive buzzer sounding.
Embodiment 1
Based on the above design principle: referring to Fig. 1: a kind of air conditioner electric control plate buzzer sounding detection method of the present embodiment,
This method includes below scheme:
S1, its mathematical function of the audio signal of one section of superposition will be obtained when buzzer sounding firstly, passing through analysis and obtaining
Model is y=sinx+1/2*sin 2x+1/3*sin 3x+1/4*sin 4x+ ..., according to the principle of Fourier space, period letter
Number can expand into constant and one group of the sum of SIN function and cosine function with common cycle；Concrete analysis process are as follows:
Wherein ω=2 π/T；
N=0,1,2,3 ...；
N=1,2,3,4 ...；
At discontinuous point, following formula is set up:
A0/2 is the DC component of signal f (t)；
It enables
C1 is fundamental voltage amplitude, and cn is the amplitude of nth harmonic；C1 is sometimes referred to as the amplitude of first harmonic；A0/2 is sometimes referred to as 0
The amplitude of subharmonic.
S2, secondly, again by introduce Fourier transformation obtain following result for any one compounding period oscillating function y
(T) fourier series exploded representation is pressed are as follows: a DC component, a fundamental wave, first harmonic, second harmonic, triple-frequency harmonics, high order
Harmonic wave；
S3, finally, by using microphone samples in collective and filter circuit, then microphone samples audio signal uses
Second order passive bandpass filters filter out higher hamonic wave and obtain the fundamental wave of passband, then calculate amplifier, amplification sampling by hardware amplifier
The AD conversion unit of Waveform Input microprocessor is being converted into digital quantity signal in real time and is recording maximum by filtered waveform
Component value, be compared within the unit time using maximum component value and preset numerical value, the condition MCU of satisfaction passes through pin
It controls relay to be attracted, being unsatisfactory for condition, then relay is failure to actuate, to judge whether buzzer sounding is normal；Circuit diagram
Such as Fig. 5-6.
The detection method of the present embodiment captures buzzer in the fixation position close to buzzer by placing detection circuit
The frequency and amplitude of vibration issued when work determines buzzer work using microprocessing unit after analog voltage signal by being converted into automatically
Whether normal and digital quantity signal is provided by relay make, solves and manually sounding is listened to be easy to produce to fail to judge, it is easy by environment
The defect of noise jamming.
Embodiment 2
The present embodiment is substantially the same manner as Example 1, is in place of main difference, such as Fig. 7: the microphone samples in collective
It include VCC5V, R16, R10, R9, C4, C2, R14, MIC sound pick-up, C9, C7, R7, R5, R3 with filter circuit, the VCC5V,
R16, R10, R9, C4, C2 are sequentially connected in series, and the R14 and MIC sound pick-up, C9, C7 and one end of R7, R5, R3 are successively in parallel
Between R16 and R10, between R10 and R9, between R9 and C4, between C4 and C2, the end of C2, the other end is grounded, wherein
2 pins of MIC sound pick-up are grounded；
The present embodiment generates a fixed current potential in A point when 5V voltage flows through R16 and R14, when external audio converts
When the MIC sound pick-up voltage that is shaken A point when interior group of MIC changes by sound wave generate variation, when audio sounding is continuous
A point voltage also sends continuous transformation therewith when variation, is exactly the SIN function of a complex superposition from the point of view of mathematics.
Due to our buzzers using fixed frequency come sounding, we only need the fundamental wave of 4K, and the frequency of A point is one at this time
The waveform therefore circuit of a complex superposition introduce R10, C9, R9, C7, R7, C4, R5, C2, R3 structure to B point current potential in A point current potential
The waveform to A point is filtered at the passive Pi type bandpass filter of a second order so that only meeting the frequency ability of 4K Hz
Pass through, reaches the interference of filtering environmental noise.
Embodiment 3
The present embodiment is substantially the same manner as Example 1, is in place of main difference, and the hardware amplifier calculates amplifier and is
The scaling circuit that LM358 integrated transporting discharging chip is constituted, the microphone samples in collective and filter circuit are disposed close to
The fixation position of buzzer is come the frequency that issues and amplitude of vibration when capturing buzzer work；The present embodiment passes through amplifying circuit, close
Buzzer reduces the interference of judgement, improves the accuracy of detection.
Embodiment 4
The present embodiment also discloses a kind of air conditioner electric control plate buzzer sounding detection circuit board, when the circuit board is detecting
When work, task is executed according to the testing process of air conditioner electric control plate buzzer sounding detection method.
The present invention is filtered so that only meeting 4K Hz the waveform of A point by the passive Pi type bandpass filter of second order
Frequency could pass through, reach the interference of filtering environmental noise；Its amplitude-frequency, phase-frequency characteristic functional image such as Fig. 8, center pass through frequency
Rate calculation formula are as follows:Reuse the actual measurement second order band logical filter of baud instrument
Wave device has -5 decibels obstruction such as Fig. 9 to center by frequency 4Khz；
Signal amplifies signal by entering operational amplifier after bandpass filter arrival B point, then signal
It is input in the AD conversion module of microprocessor and analog signal is converted into digital quantity signal.Operational amplification circuit such as Figure 10 is used
LM358 integrated transporting discharging chip composition amplifying circuit.MCU_AD=(1+R8/R17) SourceIn, voltage is by B electricity to fortune
Calculation amplifying circuit is amplified into the value that MCU neutralization is set and compares；Then the logic control actuating of relay is done by MCU, electricity
Road plate PCB is as shown in figure 11.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (7)
1. a kind of air conditioner electric control plate buzzer sounding detection method, which is characterized in that this method includes below scheme:
S1, its mathematical function model of the audio signal of one section of superposition will be obtained when buzzer sounding firstly, passing through analysis and obtaining
For y=sinx+1/2*sin2x+1/3*sin3x+1/4*sin4x+ ..., according to the principle of Fourier space, periodic function all may be used
To expand into constant and one group of the sum of SIN function and cosine function with common cycle；
S2, secondly, again by introduce Fourier transformation obtain following result for any one compounding period oscillating function y (T)
By fourier series exploded representation are as follows: a DC component, a fundamental wave, first harmonic, second harmonic, triple-frequency harmonics, high order are humorous
Wave；
S3, finally, by using microphone samples in collective and filter circuit, then microphone samples audio signal uses second order
Passive bandpass filters filter out higher hamonic wave and obtain the fundamental wave of passband, then calculate amplifier by hardware amplifier, amplify sampling filter
The AD conversion unit of Waveform Input microprocessor is being converted into digital quantity signal in real time and is recording maximum point by waveform afterwards
Magnitude is compared within the unit time using maximum component value and preset numerical value, is met condition MCU and is controlled by pin
Relay is attracted, and being unsatisfactory for condition, then relay is failure to actuate, to judge whether buzzer sounding is normal.
2. air conditioner electric control plate buzzer sounding detection method according to claim 1, which is characterized in that the step S1 tool
Body analytic process are as follows:
Wherein ω=2 π/T；
N=0,1,2,3 ...；
N=1,2,3,4 ...；
At discontinuous point, following formula is set up:
A0/2 is the DC component of signal f (t)；
It enables
C1 is fundamental voltage amplitude, and cn is the amplitude of nth harmonic；C1 is sometimes referred to as the amplitude of first harmonic；A0/2 be sometimes referred to as 0 time it is humorous
The amplitude of wave.
3. air conditioner electric control plate buzzer sounding detection method according to claim 1, which is characterized in that the wheat in collective
Gram elegance sample and filter circuit include VCC5V, R16, R10, R9, C4, C2, R14, MIC sound pick-up, C9, C7, R7, R5, R3, institute
It states VCC5V, R16, R10, R9, C4, C2 to be sequentially connected in series, one end of the R14 and MIC sound pick-up, C9, C7 and R7, R5, R3
Successively be connected in parallel between R16 and R10, between R10 and R9, between R9 and C4, between C4 and C2, the end of C2, the other end connects
Ground, wherein 2 pins of MIC sound pick-up are grounded.
4. air conditioner electric control plate buzzer sounding detection method according to claim 3, which is characterized in that R10, the C9,
R9, C7, R7, C4, R5, C2, R3 constitute the passive Pi type bandpass filter of a second order and are filtered to waveform so that only meeting
The frequency of 4K Hz could pass through, and reach the interference of filtering environmental noise.
5. air conditioner electric control plate buzzer sounding detection method according to claim 1, which is characterized in that the hardware amplifier
Calculating amplifier is the scaling circuit that LM358 integrated transporting discharging chip is constituted.
6. air conditioner electric control plate buzzer sounding detection method according to claim 1, which is characterized in that the wheat in collective
Gram elegance sample and filter circuit are disposed close to the fixation position of buzzer to capture the frequency and shake that issue when buzzer work
Width.
7. a kind of air conditioner electric control plate buzzer sounding detection circuit board, which is characterized in that when the circuit board is when detecting work,
Task is executed according to the testing process of air conditioner electric control plate buzzer sounding detection method.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110636430A (en) * | 2019-08-10 | 2019-12-31 | 中山华帝电子科技有限公司 | Anti-interference buzzer test system |
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| KR950002245A (en) * | 1993-06-07 | 1995-01-04 | 배순훈 | Buzzer Inspection System by Frequency Spectrum Analysis |
| KR19990011657A (en) * | 1997-07-25 | 1999-02-18 | 윤종용 | Control device of fan motor for blowing fan of air conditioner and its control method |
| CN1959352A (en) * | 2005-11-02 | 2007-05-09 | 鸿富锦精密工业（深圳）有限公司 | System and method for testing buzzer |
| CN204101170U (en) * | 2014-07-21 | 2015-01-14 | 芜湖美智空调设备有限公司 | Hummer testing circuit |
| CN106802196A (en) * | 2017-01-16 | 2017-06-06 | 中国计量大学 | For the electronic thermometer buzzer sound sound detection device and method of automatic Verification |
| CN106885954A (en) * | 2015-12-16 | 2017-06-23 | 珠海格力电器股份有限公司 | The detection means of buzzer |
| CN108931293A (en) * | 2018-10-08 | 2018-12-04 | 伟创力电子技术(苏州)有限公司 | A kind of method and sensor of on-line testing buzzer |
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2019
- 2019-04-04 CN CN201910268564.6A patent/CN109932603A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR950002245A (en) * | 1993-06-07 | 1995-01-04 | 배순훈 | Buzzer Inspection System by Frequency Spectrum Analysis |
| KR19990011657A (en) * | 1997-07-25 | 1999-02-18 | 윤종용 | Control device of fan motor for blowing fan of air conditioner and its control method |
| CN1959352A (en) * | 2005-11-02 | 2007-05-09 | 鸿富锦精密工业（深圳）有限公司 | System and method for testing buzzer |
| CN204101170U (en) * | 2014-07-21 | 2015-01-14 | 芜湖美智空调设备有限公司 | Hummer testing circuit |
| CN106885954A (en) * | 2015-12-16 | 2017-06-23 | 珠海格力电器股份有限公司 | The detection means of buzzer |
| CN106802196A (en) * | 2017-01-16 | 2017-06-06 | 中国计量大学 | For the electronic thermometer buzzer sound sound detection device and method of automatic Verification |
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| CN110636430A (en) * | 2019-08-10 | 2019-12-31 | 中山华帝电子科技有限公司 | Anti-interference buzzer test system |
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