CN103780996B - It is a kind of to eliminate circuit of the Switching Power Supply to the sound equipment AM noises generated - Google Patents
It is a kind of to eliminate circuit of the Switching Power Supply to the sound equipment AM noises generated Download PDFInfo
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- CN103780996B CN103780996B CN201410057720.1A CN201410057720A CN103780996B CN 103780996 B CN103780996 B CN 103780996B CN 201410057720 A CN201410057720 A CN 201410057720A CN 103780996 B CN103780996 B CN 103780996B
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- pwm controller
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Abstract
The invention discloses a kind of elimination Switching Power Supplies to the circuit of the sound equipment AM noises generated, including：Sequentially connected AM/FM frequency identifications module, microprocessor, frequency control module and PWM controller；AM/FM frequency identification modules obtain the working frequency of AM/FM radio modules, and send the working frequency of acquisition to microprocessor；Microprocessor adjusts the frequency of PWM controller according to the working frequency by frequency control module, makes the frequency of the frequency departure AM/FM radio modules of PWM controller, to eliminate the influence for the noise that Switching Power Supply generates AM/FM radio modules.It is suitble to promote the use of.
Description
Technical field
The present invention relates to sound equipment power supply system field, more particularly to a kind of noise eliminated Switching Power Supply and sound equipment AM is generated
Circuit.
Background technology
Due to the appearance of D class power amplifiers, AV class sound equipment power supply systems are transformed to by heavy in the past, inefficiency low-frequency power
High-frequency, efficient Switching Power Supply.However high-frequency Switching Power Supply influences very the AM frequency ranges of AV class sound systems
Greatly, cause the certain Frequency points of AM frequency ranges can not normal radio reception.
In view of this, the prior art could be improved and improve.
Invention content
Place in view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of elimination Switching Power Supplies to sound equipment
The circuit for the noise that AM is generated, it is intended to solve AM frequency range shadow of the high-frequency Switching Power Supply to AV class sound systems in the prior art
Ring it is big, cause the certain Frequency points of AM frequency ranges can not normal radio reception the problem of.
In order to achieve the above object, this invention takes following technical schemes：
A kind of Switching Power Supply of eliminating to the circuits of the sound equipment AM noises generated, including：It is sequentially connected
AM/FM frequency identifications module, microprocessor, frequency control module and PWM controller；
Wherein, the AM/FM frequency identifications module obtains the working frequency of AM/FM radio modules, and by the work of acquisition
Frequency sends microprocessor to；Microprocessor adjusts PWM controllers according to the working frequency by frequency control module
Frequency makes the frequency of the frequency departure AM/FM radio modules of PWM controller, to eliminate power switch noise to AM/FM radio reception
The influence of module.
Circuit of the elimination Switching Power Supply to the sound equipment AM noises generated, wherein the frequency control module includes：
First metal-oxide-semiconductor, the first optocoupler and the first transformer；First metal-oxide-semiconductor is N-channel MOS pipe, and grid connects PWM controller,
Source electrode is grounded, one end of drain electrode the first transformer of connection；First optocoupler is arranged between microprocessor and PWM controller.
Circuit of the elimination Switching Power Supply to the sound equipment AM noises generated, wherein AM/FM frequency identification modules pass through
Communication or frequency sweep mode obtain the working frequency of AM/FM radio modules.
Circuit of the elimination Switching Power Supply to the sound equipment AM noises generated, which is characterized in that the PWM controller packet
It includes：The chip of one model AP3101.
Circuit of the elimination Switching Power Supply to the sound equipment AM noises generated, wherein the microprocessor includes：One is micro-
Processing chip, the model ATtiny13 of the microprocessor.
Circuit of the elimination Switching Power Supply to the sound equipment AM noises generated, wherein the grid of first metal-oxide-semiconductor connects
The 8th pin of the chip of the model AP3101 of PWM controller is connect, the 4th pin of the chip of the model AP3101 is logical
Cross the chip that the first optocoupler connects the model AP3101.
Advantageous effect：
Compared to the prior art, elimination Switching Power Supply provided by the invention passes through the circuit of the sound equipment AM noises generated
AM/FM frequency identification modules obtain the working frequency of AM/FM radio modules, and send the working frequency of acquisition to microprocessor
Device；Microprocessor adjusts the frequency of PWM controllers according to the working frequency by frequency control module, makes PWM controller
Frequency departure AM/FM radio modules frequency, to eliminate influence of the power switch noise to AM/FM radio modules., it is suitble to
It promotes the use of.
Description of the drawings
Fig. 1 is elimination Switching Power Supply of the invention to the structure diagram of the circuit of the sound equipment AM noises generated.
Signals of the Fig. 2 for elimination Switching Power Supply of the invention to the first embodiment of the circuit of the sound equipment AM noises generated
Figure.
Fig. 3 is elimination Switching Power Supply of the invention to the circuit of the first embodiment of the circuit of the sound equipment AM noises generated
Figure.
Specific implementation mode
The present invention provides a kind of elimination Switching Power Supply to the circuits of the sound equipment AM noises generated, for make the purpose of the present invention,
Technical solution and effect are clearer, clear, and the present invention is described in more detail for the embodiment that develops simultaneously referring to the drawings.It should
Understand, described herein specific examples are only used to explain the present invention, is not intended to limit the present invention.
Referring to Fig. 1, Fig. 1 is structural frames of the elimination Switching Power Supply to the circuits of the sound equipment AM noises generated of the present invention
Figure.As shown, the elimination Switching Power Supply includes to the circuit of the sound equipment AM noises generated：Sequentially connected AM/FM frequencies
Identification module 100, microprocessor 200, frequency control module 300 and PWM controller 400.
The AM/FM radio modules of sound equipment are used to receive the sound of sound equipment, since the main frequency paragraphs of AM are in 531KHz-
1602KHz is affected by Switching Power Supply, leads to occur larger abnormal sound when AM wave band radio reception, or even can not receive.AM/
The sound for receiving sound equipment is sent to the elimination Switching Power Supply of the present invention to the sound equipment AM noises generated by FM radio modules 100
In AM/FM frequency identifications module 100 in circuit, AM/FM frequency identifications module 100 obtains the work frequency of AM/FM radio modules
Rate, and send the working frequency of acquisition to microprocessor 200；Microprocessor 200 passes through frequency control according to the working frequency
Molding block 300 adjusts the frequency of PWM controllers 400, makes the frequency of the frequency departure AM/FM radio modules of PWM controller 400
Rate, to eliminate influence of the power switch noise to AM/FM radio modules.
Illustrate electricity of the above-mentioned elimination Switching Power Supply to the sound equipment AM noises generated below by a specific embodiment
How road works.
Please continue to refer to Fig. 2, for the present invention elimination Switching Power Supply to the first of the circuits of the sound equipment AM noises generated
The schematic diagram of embodiment.As shown, the frequency control module includes：First metal-oxide-semiconductor Q1, the first optocoupler U1 and the first transformation
Device T1；The first metal-oxide-semiconductor Q1 is N-channel MOS pipe, and grid connects PWM controller, source electrode ground connection, and drain electrode connection first becomes
One end of depressor T1；The first optocoupler U1 is arranged between microprocessor and PWM controller.
Specifically, after microprocessor receives the working frequency of AM/FM radio modules 100, pass through the first optocoupler U1
The frequency of PWM controllers is adjusted, makes the frequency of the frequency departure AM/FM radio modules of PWM controller, meanwhile, PWM controls
Device is transmitted a signal to by the first metal-oxide-semiconductor Q1 on the first transformer T1, and energy conversion is realized.
Please refer to Fig. 3, Fig. 3 is the elimination Switching Power Supply of the present invention to the first of the circuits of the sound equipment AM noises generated
The circuit diagram of embodiment.As shown, the PWM controller includes：The chip of one model AP3101.In addition, micro- place
Managing device includes：One micro-chip processor, the model ATtiny13 of the microprocessor.As shown, the grid of first metal-oxide-semiconductor
Connect the 8th pin of the chip of the model AP3101 of PWM controller, the 4th pin of the chip of the model AP3101
The chip of the model AP3101 is connected by the first optocoupler.
Specifically, after the third foot of the CON2 receives working frequency, ATtiny13 is sent it to, then
ATtiny13 adjusts the frequency of PWM controllers AP3101 according to the working frequency by the first optocoupler U1（Input signal is logical
Cross the 4th pin of the chip of AP3101）, make the frequency of the frequency departure AM/FM radio modules 100 of PWM controller, to disappear
Influence except power switch noise to AM/FM radio modules.Meanwhile AP3101 is given by the second optocoupler U2 feedback signals
ATtiny13, and third optocoupler U3 is outputed signal to by the 8th pin and realizes voltage stabilizing feedback.
In conclusion circuit of the elimination Switching Power Supply provided by the invention to the sound equipment AM noises generated, including：Connect successively
AM/FM frequency identifications module, microprocessor, frequency control module and the PWM controller connect；It is received by AM/FM radio modules
It to the sound of sound equipment, is then sent in AM/FM frequency identification modules, AM/FM frequency identification modules obtain AM/FM radio reception
The working frequency of module, and send the working frequency of acquisition to microprocessor；Microprocessor passes through according to the working frequency
Frequency control module adjusts the frequency of PWM controllers, makes the frequency of the frequency departure AM/FM radio modules of PWM controller,
To eliminate influence of the power switch noise to AM/FM radio modules.It is suitble to promote the use of.
It, can according to the technique and scheme of the present invention and its hair it is understood that for those of ordinary skills
Bright design is subject to equivalent substitution or change, and all these changes or replacement should all belong to the guarantor of appended claims of the invention
Protect range.
Claims (1)
1. a kind of eliminating circuit of the Switching Power Supply to the sound equipment AM noises generated, which is characterized in that including：Sequentially connected AM/
FM frequency identifications module, microprocessor, frequency control module and PWM controller；
Wherein, the AM/FM frequency identifications module obtains the working frequency of AM/FM radio modules, and by the working frequency of acquisition
Send microprocessor to；Microprocessor adjusts the frequency of PWM controllers according to the working frequency by frequency control module
Rate makes the frequency of the frequency departure AM/FM radio modules of PWM controller, is produced to AM/FM radio modules to eliminate Switching Power Supply
The influence of raw noise；
The frequency control module includes the first metal-oxide-semiconductor, the first optocoupler and the first transformer；First metal-oxide-semiconductor is N-channel
Metal-oxide-semiconductor, grid connect PWM controller, source electrode ground connection, one end of drain electrode the first transformer of connection；First optocoupler
It is arranged between microprocessor and PWM controller；
After microprocessor receives the working frequency of AM/FM radio modules, PWM controllers are adjusted by the first optocoupler
Frequency makes the frequency of the frequency departure AM/FM radio modules of PWM controller, meanwhile, PWM controller is sent by the first metal-oxide-semiconductor
On signal to the first transformer, energy conversion is realized；
The PWM controller includes the chip of a model AP3101；
The microprocessor includes the micro-chip processor of a model ATtiny13；
The 8th pin of the chip AP3101 of the grid connection PWM controller of first metal-oxide-semiconductor, the of the chip AP3101
Four pins are connect by the first optocoupler with the chip ATtiny13；
After the third foot of CON2 receives working frequency, chip ATtiny13 is sent it to, then chip ATtiny13 roots
The frequency for adjusting PWM controller chips AP3101 by the first optocoupler according to the working frequency, makes the frequency of PWM controller
Rate deviates the frequency of AM/FM radio modules, meanwhile, chip AP3101 gives chip ATtiny13 by the second opto-coupled feedback signal,
And third optocoupler is outputed signal to by the 8th pin of chip ATtiny13 and realizes voltage stabilizing feedback；
Wherein, the frequency after being adjusted to chip AP3101 inputs by the 4th pin of chip AP3101；
AM/FM frequency identifications module obtains the working frequency of AM/FM radio modules by communication or frequency sweep mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410057720.1A CN103780996B (en) | 2014-02-20 | 2014-02-20 | It is a kind of to eliminate circuit of the Switching Power Supply to the sound equipment AM noises generated |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410057720.1A CN103780996B (en) | 2014-02-20 | 2014-02-20 | It is a kind of to eliminate circuit of the Switching Power Supply to the sound equipment AM noises generated |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103780996A CN103780996A (en) | 2014-05-07 |
| CN103780996B true CN103780996B (en) | 2018-10-02 |
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| CN201410057720.1A Active CN103780996B (en) | 2014-02-20 | 2014-02-20 | It is a kind of to eliminate circuit of the Switching Power Supply to the sound equipment AM noises generated |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107436666B (en) | 2016-05-26 | 2020-11-06 | 华为终端有限公司 | Control method and control device of power adapter |
| CN108549476B (en) * | 2018-03-15 | 2020-07-10 | 维沃移动通信有限公司 | Method and terminal for switching SMPS working frequency |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101399559A (en) * | 2007-09-28 | 2009-04-01 | 普诚科技股份有限公司 | Sound signal processing device |
| CN201616821U (en) * | 2010-03-05 | 2010-10-27 | 新昌有限公司 | Broadcast AM channel noise interference resistant device |
| CN201656767U (en) * | 2009-09-18 | 2010-11-24 | 惠州市德赛汽车电子有限公司 | Power supply module capable of implementing frequency conversion |
| CN102510274A (en) * | 2011-11-21 | 2012-06-20 | 中兴通讯股份有限公司 | PWM frequency control method for class-D power amplifiers and device adopting same |
| CN103248376A (en) * | 2013-05-02 | 2013-08-14 | 重庆徐港电子有限公司 | Vehicle-mounted FM/AM radio set free from interference of switching power supply and anti-interference method thereof |
| CN203775393U (en) * | 2014-02-20 | 2014-08-13 | 深圳市京泉华科技股份有限公司 | Circuit capable of eliminating noises imposed on audio AM frequency band by switching power supply |
-
2014
- 2014-02-20 CN CN201410057720.1A patent/CN103780996B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101399559A (en) * | 2007-09-28 | 2009-04-01 | 普诚科技股份有限公司 | Sound signal processing device |
| CN201656767U (en) * | 2009-09-18 | 2010-11-24 | 惠州市德赛汽车电子有限公司 | Power supply module capable of implementing frequency conversion |
| CN201616821U (en) * | 2010-03-05 | 2010-10-27 | 新昌有限公司 | Broadcast AM channel noise interference resistant device |
| CN102510274A (en) * | 2011-11-21 | 2012-06-20 | 中兴通讯股份有限公司 | PWM frequency control method for class-D power amplifiers and device adopting same |
| CN103248376A (en) * | 2013-05-02 | 2013-08-14 | 重庆徐港电子有限公司 | Vehicle-mounted FM/AM radio set free from interference of switching power supply and anti-interference method thereof |
| CN203775393U (en) * | 2014-02-20 | 2014-08-13 | 深圳市京泉华科技股份有限公司 | Circuit capable of eliminating noises imposed on audio AM frequency band by switching power supply |
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| CN103780996A (en) | 2014-05-07 |
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