CN109218946A - A kind of device with microphone estimation power amplifier output voltage - Google Patents
A kind of device with microphone estimation power amplifier output voltage Download PDFInfo
- Publication number
- CN109218946A CN109218946A CN201811091077.9A CN201811091077A CN109218946A CN 109218946 A CN109218946 A CN 109218946A CN 201811091077 A CN201811091077 A CN 201811091077A CN 109218946 A CN109218946 A CN 109218946A
- Authority
- CN
- China
- Prior art keywords
- power amplifier
- capacitor
- mems microphone
- microphone
- output voltage
- 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.)
- Withdrawn
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 32
- 239000000919 ceramic Substances 0.000 claims abstract description 8
- 230000003321 amplification Effects 0.000 claims abstract description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 6
- 230000008878 coupling Effects 0.000 claims abstract description 4
- 238000010168 coupling process Methods 0.000 claims abstract description 4
- 238000005859 coupling reaction Methods 0.000 claims abstract description 4
- 238000005538 encapsulation Methods 0.000 abstract description 4
- 238000004080 punching Methods 0.000 abstract description 2
- 230000000007 visual effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000003985 ceramic capacitor Substances 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R19/00—Electrostatic transducers
- H04R19/04—Microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/003—Mems transducers or their use
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of device with microphone estimation power amplifier output voltage, the power amplifiers for being PWM or PFM suitable for modulation system comprising power amplifier module, MEMS microphone and signal processing module.Power amplifier module includes power amplification unit, buffer cell and output unit, and buffer cell includes first capacitor, and first capacitor is ceramic condenser.MEMS microphone uses the encapsulation of underlying acoustic aperture, the layout another side opposite with first capacitor on circuit boards, by punching on circuit boards and first capacitor generates accurate acoustical coupling.Signal processing module is electrically connected with the output end of MEMS microphone, detects the voltage of MEMS microphone.The present invention can be evaluated whether to obtain power amplifier output voltage by MEMS microphone, has gained some understanding and controls so as to the working condition to power amplifier.Circuit of the present invention is simple, and component is few, is electrically isolated, visual result, reliable, can be widely used in the design of power amplifier.
Description
Technical field
The present invention relates to field electronic circuit field, especially a kind of device with microphone estimation power amplifier output voltage.
Background technique
Power amplifier being of wide application in production and living, different field, different regions all relate to.Using PWM or PFM
The buffer part that the power amplifier of modulation system is usually made of by one resistance and capacitor after power amplifier module is conciliate without loss
The output voltage of tune can pass through this buffer part, and the voltage at capacitor both ends is the output electricity of unprocessed mistake in the buffer part
Pressure.The output voltage of power amplifier is the intuitive embodiment to the working condition of power amplifier, this numerical value has weight to the protection and control of power amplifier
Big meaning.It may be AC signal however since the output voltage of power amplifier is usually higher, it is difficult to be directly processed device use.For
The output that can be used directly is generated, the prior art can be increased many and designed and manufactured using the methods of rectification, decompression
Cost.
The buffer part capacitor of existing power amplifier generallys use ceramic capacitor, and the piezoelectricity due to caused by the strong dielectricity of ceramics is imitated
It answers, ceramic condenser can generate deformation sounding, the intensity of this sound and the voltage at ceramic condenser both ends after applying alternating current
It is directly proportional.
Therefore, it is necessary to which providing a kind of can obtain the dress of the untreated output voltage of power amplifier according to the sound of ceramic condenser
It sets.
Summary of the invention
In view of the above problems, the present invention provides a kind of devices with microphone estimation power amplifier output voltage.
The invention discloses it is a kind of with microphone estimation power amplifier output voltage device, be suitable for modulation system be PWM or
The power amplifier of PFM.It includes power amplifier module, MEMS microphone and signal processing module.The power amplifier module includes power amplification list
Member, buffer cell and output unit, the buffer cell include first capacitor, and the first capacitor is ceramic condenser.It is described
MEMS microphone uses the encapsulation of underlying acoustic aperture, the layout another side opposite with the first capacitor on circuit boards, by
Punching generates accurate acoustical coupling with the first capacitor on circuit board.The signal processing module and the MEMS microphone
Output end electrical connection, detects the voltage of the MEMS microphone.
The power amplifier module includes a buffer cell, and the buffer cell includes first capacitor, and the first capacitor is pottery
Porcelain capacitor.The first capacitor when the power amplifier module works can output sound, this sound pressure level and be applied to described first
Voltage on capacitor is directly proportional, and proportionality coefficient can be read from the factory data of the first capacitor, can also apply voltage voluntarily
Measurement.
The MEMS microphone use underlying acoustic aperture encapsulation, and the MEMS microphone layout on circuit boards with it is described
The opposite another side of first capacitor is beaten on the circuit board between the sound inlet and the first capacitor of the MEMS microphone
Hole, so that the sound of the first capacitor is accurately captured by the MEMS microphone.
The signal processing module is electrically connected the output end of the MEMS microphone, according to the voltage of the first capacitor with
The proportionality coefficient made a sound can estimate the untreated output voltage of the power amplifier module.
Circuit of the invention is simple, and component is few, and realizes electric isolution, the result of estimation by the MEMS microphone
Intuitively, it reliably, can be widely used in and need in the design using output voltage control power amplifier.
In order to above content of the invention can be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate institute's accompanying drawings,
It is described in detail below.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is schematic block circuit diagram of the invention；
Fig. 2 is circuit-board laying-out schematic diagram of the invention.
It is numbered in figure:
10,110: the power amplifier module；
20,120: the MEMS microphone；
30,130: the signal processing module；
101,111: the power amplification unit；
102,112: the buffer cell；
103,113: the output unit；
1021,1121: the first capacitor.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be arranged and be designed with a variety of different configurations.Therefore, below to the reality of the invention provided in the accompanying drawings
The detailed description for applying example is not intended to limit the range of claimed invention, but is merely representative of selected implementation of the invention
Example.
Referring to Fig. 1, at schematic block circuit diagram of the invention, including power amplifier module 10, MEMS microphone 20 and signal
Manage module 30.Power amplifier module 10 includes power amplification unit 110, buffer cell 120 and output unit 130, and buffer cell 120 wraps
Include first capacitor 121.MEMS microphone 20 and first capacitor 121 have acoustical coupling.Signal processing module 30 and MEMS microphone 20
Electrical connection detects the voltage of MEMS microphone 20.Then intensity is made a sound with it according to the output voltage of first capacitor 121
Proportionality coefficient can estimate the untreated output voltage of power amplifier module 10.
Referring to Fig. 2, being circuit-board laying-out schematic diagram of the invention, including power amplifier module 110,120 and of MEMS microphone
130. power amplifier module 110 of signal processing module includes power amplification unit 111, buffer cell 112 and output unit 113, buffering
Unit 112 includes first capacitor 1121.MEMS microphone 120 selects the encapsulation of underlying acoustic aperture.First capacitor 1121 and MEMS wheat
Gram wind 120 faces the upper and lower surface for being distributed in circuit board, and punches on the circuit board at 120 sound hole of MEMS microphone,
Position is as shown in Figure 2.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (4)
1. it is a kind of with microphone estimation power amplifier output voltage device, which is characterized in that including power amplifier module, MEMS microphone and
Signal processing module；The power amplifier module includes power amplification unit, buffer cell and output unit, and the buffer cell includes
First capacitor；The MEMS microphone layout faces the another side of the first capacitor on circuit boards, and the two has acoustical coupling；
The signal processing module is electrically connected with the output end of the MEMS microphone.
2. a kind of device with microphone estimation power amplifier output voltage as described in claim 1, which is characterized in that described first
Capacitor is ceramic condenser.
3. a kind of device with microphone estimation power amplifier output voltage as described in claim 1, which is characterized in that described first
Capacitor is ceramic condenser.
4. a kind of device with microphone estimation power amplifier output voltage as described in claim 1, which is characterized in that described
It needs to punch on opposite circuit board between MEMS microphone and the first capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811091077.9A CN109218946A (en) | 2018-09-19 | 2018-09-19 | A kind of device with microphone estimation power amplifier output voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811091077.9A CN109218946A (en) | 2018-09-19 | 2018-09-19 | A kind of device with microphone estimation power amplifier output voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109218946A true CN109218946A (en) | 2019-01-15 |
Family
ID=64984376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811091077.9A Withdrawn CN109218946A (en) | 2018-09-19 | 2018-09-19 | A kind of device with microphone estimation power amplifier output voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109218946A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2033130C1 (en) * | 1990-02-14 | 1995-04-20 | Государственный научно-исследовательский медико-инженерный центр немедикаментозного оздоровления, реабилитации, терапии "НОРТ" АН Украины | Device for vibromassage of respiratory organs |
| CN102664002A (en) * | 2012-05-21 | 2012-09-12 | 河南科技大学 | Active noise attenuation system and sound absorption method on basis of minimum quadratic sum of reflecting acoustic pressure |
| TW201608901A (en) * | 2014-08-21 | 2016-03-01 | 國立交通大學 | Piezoelectric speaker driving system and method thereof |
| JP2017112582A (en) * | 2015-12-19 | 2017-06-22 | 株式会社検査技術研究所 | Ultrasonic microphone device and method for converting volt in electric unit into pascal or decibel in acoustic unit regarding output signal of ultrasonic microphone |
| CN208609194U (en) * | 2018-09-19 | 2019-03-15 | 南京拓途电子有限公司 | A kind of device with microphone estimation power amplifier output voltage |
-
2018
- 2018-09-19 CN CN201811091077.9A patent/CN109218946A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2033130C1 (en) * | 1990-02-14 | 1995-04-20 | Государственный научно-исследовательский медико-инженерный центр немедикаментозного оздоровления, реабилитации, терапии "НОРТ" АН Украины | Device for vibromassage of respiratory organs |
| CN102664002A (en) * | 2012-05-21 | 2012-09-12 | 河南科技大学 | Active noise attenuation system and sound absorption method on basis of minimum quadratic sum of reflecting acoustic pressure |
| TW201608901A (en) * | 2014-08-21 | 2016-03-01 | 國立交通大學 | Piezoelectric speaker driving system and method thereof |
| JP2017112582A (en) * | 2015-12-19 | 2017-06-22 | 株式会社検査技術研究所 | Ultrasonic microphone device and method for converting volt in electric unit into pascal or decibel in acoustic unit regarding output signal of ultrasonic microphone |
| CN208609194U (en) * | 2018-09-19 | 2019-03-15 | 南京拓途电子有限公司 | A kind of device with microphone estimation power amplifier output voltage |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20190115 |
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| WW01 | Invention patent application withdrawn after publication |