CN109167581A - A kind of standby heating system of switched mode power amplifier - Google Patents
A kind of standby heating system of switched mode power amplifier Download PDFInfo
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- CN109167581A CN109167581A CN201811425548.5A CN201811425548A CN109167581A CN 109167581 A CN109167581 A CN 109167581A CN 201811425548 A CN201811425548 A CN 201811425548A CN 109167581 A CN109167581 A CN 109167581A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 12
- 238000001514 detection method Methods 0.000 claims abstract description 47
- 238000001914 filtration Methods 0.000 claims abstract description 20
- 206010037660 Pyrexia Diseases 0.000 claims abstract description 10
- 239000003990 capacitor Substances 0.000 claims description 5
- 230000010355 oscillation Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000005236 sound signal Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/01—Shaping pulses
- H03K5/04—Shaping pulses by increasing duration; by decreasing duration
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of standby heating system of switched mode power amplifier, it is suitable under various scenes, especially low temperature, humidity or the harsh area of natural environment comprising input stage, modulating stage, power stage, output stage and control unit.Input stage includes error amplifier, output electrical connection modulating stage；Modulating stage includes frequency-variable module and comparator, output electrical connection power stage；Power stage is to amplify pwm signal, output electrical connection output stage；Output stage includes feedback section and filtering part；Control unit includes detection module, switching switch and processor, and detection module detection external environment simultaneously sends result to processor, and switching switch is manually selected by user, and switching result is sent to processor, output electrical connection frequency-variable module.The present invention is in external condition harshness, by frequency-variable module, so that power amplifier fever or reduction electric energy loss.This system is low in cost, and circuit is simple, and it is convenient to realize, is particularly suitable for low temperature, humidity or the harsh area of natural environment.
Description
Technical field
The present invention relates to field electronic circuit field, the standby heating system of especially a kind of switched mode power amplifier.
Background technique
Power amplifier being of wide application in production and living, different field, different regions all relate to.In majority of case
Under, since high temperature can cause irreversible damage to the component having in power amplifier, so heat dissipation is always power amplifier from being designed into
The problem of using that will pay attention to.However, under certain special application scenarios, such as low temperature, humidity or natural environment are harsh
Area etc., power amplifier will be due to the long-term probability for influencing to increase failure of environment.
In the prior art, the device that can not work normally in power amplifier in low temperature can be replaced with dedicated cryogenic device or
Using three-proofing coating, this behave is at high cost, and is difficult to achieve the effect that in anticipation, it is possible to be difficult to be adapted to original power amplifier, need
Manufacture is redesigned, manpower and material resources are increased, it is very uneconomical.Outdoor environment uses under battery powered environment, electric energy money
Source is insufficient, when power amplifier in the standby state when, it is necessary to reducing loss can carry out the longer time under limited electric energy
Work.
Therefore, it is necessary to provide the system for making power amplifier normal work and low cost in particular circumstances.
Summary of the invention
In view of the above problems, the present invention provides a kind of standby heating systems of switched mode power amplifier.
The invention discloses a kind of standby heating systems of switched mode power amplifier, are suitable under various scenes, especially
It is low temperature, humidity or the harsh area of natural environment comprising input stage, modulating stage, power stage, output stage and control unit.
Input signal makes a sound after the input stage, the modulating stage, the power stage and the output stage through loudspeaker.Institute
Stating input stage includes error amplifier, and output is electrically connected the modulating stage；The modulating stage includes frequency-variable module and comparator, defeated
It is electrically connected the power stage out；The power stage is electrically connected the output stage to amplify pwm signal, output；The output stage
Including feedback section and filtering part；Described control unit includes that detection module, switching switch and processor, output are electrically connected the change
Frequency module.
The input stage includes an error amplifier, and input signal is the feedback letter of external audio signal and the output stage
Number, output signal is error signal.The power stage input signal is pwm signal, and output signal is to be amplified to power rail
Pwm signal.The output stage includes a filtering part and a feedback section, and filtering part is filtered the output signal of the power stage
Output, by the way of LC filtering, including the first filter inductance and the first filter capacitor；The signal that feedback section takes out filtering part is made
For the input signal of the input stage, including the first feedback resistance, the second feedback resistance, third feedback resistance and the first feedback electricity
Hold.
The modulating stage includes frequency-variable module and comparator, and using pulsewidth modulation, input signal is error signal, output letter
Number be pwm signal.The frequency-variable module include at least two kinds of frequencies oscillating circuit, one of frequency be power amplifier just
Often frequency of oscillation when work, referred to as normal working frequency；Another kind for lower than first inductance of output stage filtering part from humorous
Vibration frequency and the fever frequency for being higher than normal work frequency of oscillation.The frequency-variable module includes up to the oscillation electricity of three kinds of frequencies
Road, respectively normal working frequency, fever frequency, and lower than normal working frequency and the low-power consumption of stand-by power consumption can be reduced frequently
Rate.
Described control unit includes detection module, switching switch and processor.The detection module includes input signal inspection
It surveys, temperature detection and Humidity Detection, testing result issue the processor.The number of options and the frequency conversion of the switching switch
The quantity of module oscillating circuit is corresponding, and switching result issues the processor.The processor is examined by input signal first
Survey judges whether power amplifier is in standby: if there is signal input, the frequency-variable module being set as normal working frequency；If nothing
Signal input, will carry out the following processing.If user by the switching switch manual switch frequency of oscillation, processor according to
Family selection control frequency-variable module；If the switching switch, opening temperature detection and Humidity Detection: the processing is not used in user
Temperature threshold and humidity threshold are preset in device, when detection temperature is higher than humidity threshold lower than temperature threshold or detection humidity
When, the processor controls the frequency-variable module selection fever frequency；When detection temperature is low higher than temperature threshold or detection humidity
When humidity threshold, the processor controls the frequency-variable module and selects normal working frequency.If there are three kinds of frequencies for frequency-variable module
The oscillating circuit of rate, then when detection temperature is higher than temperature threshold or detection humidity is lower than humidity threshold, the processor control
The frequency-variable module selects low-power consumption frequency.
First filter inductance of the output stage filtering part has self-resonant frequency, in practical engineering applications, usually will be electric
The actual operating frequency of sense is selected as 1/10th of self-resonant frequency, and when reaching self-resonant frequency, inductance can acutely generate heat；When
When more than self-resonant frequency, change of properties can occur for inductance, can not work normally.In the present invention, the magnetic of inductance when high frequency is utilized
Stagnant loss is big, to generate heat, heats under low temperature or wet environment for power amplifier.
The present invention is in external condition harshness, by frequency-variable module, may make that component fever is in circuit so as to cause function
Fever is put, can also turn down frequency of oscillation by frequency-variable module when necessary, reduces stand-by power consumption；It can also be opened by user using switching
Close the frequency of oscillation of control power amplifier.Low in cost, circuit is simple, and it is convenient to realize, can be widely used under various scenes, especially low
Temperature, moist or harsh natural environment area.
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 connection signal block diagram of the invention；
Fig. 2 is the circuit diagram of first embodiment of the invention；
Fig. 3 is the control flow chart of control unit in first embodiment of the invention；
Fig. 4 is the circuit diagram of second embodiment of the invention；
Fig. 5 is the control flow chart of control unit in second embodiment of the invention.
It is numbered in figure:
10,10A, 10B: input stage；20,20A, 20B: modulating stage；
30,30A, 30B: power stage；40,40A, 40B: output stage；
50,50A, 50B: control unit；101: error amplifier；
201,201A, 201B: frequency-variable module；202: comparator；
401,401A, 401B: filtering part；402,402A, 402B: feedback section；
501A, 501B: processor；502A, 502B: detection module；
503A, 503B: switching switch；L1, L1 ': the first filter inductance；
C1, C1 ': the first filter capacitor；R1, R1 ': the first feedback resistance；
R2, R2 ': the second feedback resistance；R3, R3 ': third feedback resistance；
C2, C2 ': the first feedback capacity.
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, being connection signal block diagram of the invention, including input stage 10, modulating stage 20, power stage 30, output
Grade 40 and control unit 50.Input stage 10 includes an error amplifier 101, and input signal is external audio signal and output stage 40
Feedback signal.Modulating stage 20 includes frequency-variable module 201 and comparator 202, and input signal is error signal, and output signal is
Pwm signal.30 input signal of power stage is pwm signal, and output signal is the pwm signal for being amplified to power rail.Output stage 40
Including a filtering part 401 and a feedback section 402, filtering part 401 is filtered output to the output signal of power stage 30；Feedback section
402 take out input signal of the signal of filtering part 401 as input stage 10.Input signal passes through input stage 10, modulating stage 20, function
It is made a sound after rate grade 30 and output stage 40 through loudspeaker.Control unit 50 controls the frequency of oscillation selection of frequency-variable module 201.
Referring to Fig. 2, being the circuit diagram of first embodiment of the invention, including input stage 10A, modulating stage 20A, power
Grade 30A, output stage 40A and control unit 50A.Modulating stage 20A includes frequency-variable module 201A, in the present embodiment, frequency-variable module
Two kinds of frequencies can be switched in 201A.Output stage 40A includes an a filtering part 401A and feedback section 402A, and filtering part 401A is to power stage
The output signal of 30A is filtered output, including the first filter inductance L1 and the first filter capacitor C1；Feedback section 402A takes out filter
The signal of A, B two o'clock feed back input signal as input stage 10A in wave portion 401A, including the first feedback resistance R1, the
Two feedback resistance R2, third feedback resistance R3 and the first feedback capacity C2.Input signal by input stage 10A, modulating stage 20A,
It is made a sound after power stage 30A and output stage 40A through loudspeaker.Control unit 50A includes processor 501A, detection module 502A
With switching switch 503A, corresponding frequency of oscillation is selected to control frequency-variable module 201A, detection module 502A includes temperature inspection
Survey, Humidity Detection and input signal detection；Two kinds of frequencies can be switched in switching switch 503A in the present embodiment.
Referring to Fig. 3, for the control flow chart of control unit in first embodiment of the invention.After power amplifier booting, first
Input signal detection is carried out by the detection module 502A in Fig. 2, when having detected signal input, processor 501A controls frequency conversion
Module 201A selects normal working frequency；When detecting the input of no signal, if user uses switching switch selection oscillation frequency
Rate then selects to use corresponding frequency of oscillation by processor 501A control frequency-variable module 201A according to user；If user does not make
It is switched with switching, then start-up temperature and Humidity Detection: when temperature is higher than temperature threshold or humidity is lower than humidity threshold, processor
501A controls frequency-variable module 201A and selects normal working frequency；When temperature is higher than humidity threshold lower than temperature threshold or humidity,
Processor 501A controls frequency-variable module 201A selection fever frequency.Detection module 502A will carry out lasting input signal detection,
Once status input signal changes or switches, switch is artificially stirred, and processor 501A will make a response and adjust immediately
It is whole.
Referring to Fig. 4, being the circuit diagram of second embodiment of the invention, including input stage 10B, modulating stage 20B, function
Rate grade 30B, output stage 40B and control unit 50B.Modulating stage 20B includes frequency-variable module 201B, in the present embodiment, frequency conversion mould
Three kinds of frequencies can be switched in block 201B.Output stage 40B includes an a filtering part 401B and feedback section 402B, and filtering part 401B is to power
The output signal of grade 30B is filtered output, including the first filter inductance L1 ' and the first filter capacitor C1 '；Feedback section 402B takes
Out A ' in filtering part 401B, B ' two o'clock signal carry out feeding back the input signal as input stage 10B, including the first feedback resistance
R1 ', the second feedback resistance R2 ', third feedback resistance R3 ' and the first feedback capacity C2 '.Input signal is by input stage 10B, tune
It is made a sound after grade 20B processed, power stage 30B and output stage 40B through loudspeaker.Control unit 50B includes processor 501B, detection
Module 502B and switching switch 503B selects corresponding frequency of oscillation, detection module 502B packet to control frequency-variable module 201B
Include temperature detection, Humidity Detection and input signal detection；Three kinds of frequencies can be switched in switching switch 503B in the present embodiment.
Referring to Fig. 5, for the control flow chart of control unit in second embodiment of the invention.After power amplifier booting, first
Input signal detection is carried out by the detection module 502B in Fig. 4, when having detected signal input, processor 501B controls frequency conversion
Module 201B selects normal working frequency；When detecting the input of no signal, if user uses switching switch selection oscillation frequency
Rate then selects to use corresponding frequency of oscillation by processor 501B control frequency-variable module 201B according to user；If user does not make
It is switched with switching, then start-up temperature and Humidity Detection: when temperature is higher than temperature threshold or humidity is lower than humidity threshold, processor
501B controls frequency-variable module 201B and selects low-power consumption frequency；When temperature is higher than humidity threshold lower than temperature threshold or humidity, place
Manage device 501B control frequency-variable module 201B selection fever frequency.Detection module 502B will carry out lasting input signal detection, and one
Denier status input signal changes or switches to switch and artificially stirred, and processor 501B will make a response and adjust immediately
It is whole.
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 (6)
1. in a kind of standby heating system of switched mode power amplifier, which is characterized in that including input stage, modulating stage, power
Grade, output stage and control unit；The input stage includes error amplifier, and output is electrically connected the modulating stage；The modulating stage
Including frequency-variable module and comparator, output is electrically connected the power stage；The power stage is electrically connected to amplify pwm signal, output
Connect the output stage；The output stage includes feedback section and filtering part；Described control unit include detection module, switching switch and
Processor, output are electrically connected the frequency-variable module.
2. a kind of standby heating system of switched mode power amplifier as described in claim 1, which is characterized in that the modulation
Grade uses pulsewidth modulation, including frequency-variable module and comparator, the frequency-variable module include the oscillating circuit of at least two frequencies: just
Normal working frequency and fever frequency；Include up to the oscillating circuit of three kinds of frequencies: normal working frequency, fever frequency and low-power consumption
Frequency.
3. a kind of standby heating system of switched mode power amplifier as described in claim 1, which is characterized in that the output
Grade includes feedback section and filtering part, and the feedback section includes the first feedback resistance, the second feedback resistance, third feedback resistance and the
One feedback capacity is connected after the second feedback resistance is in parallel with the first feedback capacity with third feedback resistance, above-mentioned entirety and first
The feedback section is constituted after feedback resistance is in parallel.
4. a kind of standby heating system of switched mode power amplifier as described in claim 1, which is characterized in that the output
Grade includes feedback section and filtering part, using LC filter circuit, including the first filter inductance and the first filter capacitor.
5. a kind of standby heating system of switched mode power amplifier as described in claim 1, which is characterized in that the control
Unit includes that detection module, switching switch and processor, the detection module include input signal detection, temperature detection and humidity
Detection.
6. a kind of standby heating system of switched mode power amplifier as described in claim 1, which is characterized in that the control
Unit includes that detection module, switching switch and processor, the detection module include input signal detection, temperature detection and humidity
Detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811425548.5A CN109167581A (en) | 2018-11-27 | 2018-11-27 | A kind of standby heating system of switched mode power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811425548.5A CN109167581A (en) | 2018-11-27 | 2018-11-27 | A kind of standby heating system of switched mode power amplifier |
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| Publication Number | Publication Date |
|---|---|
| CN109167581A true CN109167581A (en) | 2019-01-08 |
Family
ID=64875142
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811425548.5A Withdrawn CN109167581A (en) | 2018-11-27 | 2018-11-27 | A kind of standby heating system of switched mode power amplifier |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008160776A (en) * | 2006-12-26 | 2008-07-10 | Funai Electric Co Ltd | Class-d amplifier |
| US20100013554A1 (en) * | 2008-07-16 | 2010-01-21 | Samsung Electronics Co., Ltd | Switching power amplifier and method of controlling the same |
| CN102195577A (en) * | 2010-03-18 | 2011-09-21 | 雅马哈株式会社 | Class-D power amplifier |
| US20170164127A1 (en) * | 2015-12-04 | 2017-06-08 | Nxp B.V. | Audio processing system |
| CN209134366U (en) * | 2018-11-27 | 2019-07-19 | 南京拓途电子有限公司 | A kind of standby heating system of switched mode power amplifier |
-
2018
- 2018-11-27 CN CN201811425548.5A patent/CN109167581A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008160776A (en) * | 2006-12-26 | 2008-07-10 | Funai Electric Co Ltd | Class-d amplifier |
| US20100013554A1 (en) * | 2008-07-16 | 2010-01-21 | Samsung Electronics Co., Ltd | Switching power amplifier and method of controlling the same |
| CN102195577A (en) * | 2010-03-18 | 2011-09-21 | 雅马哈株式会社 | Class-D power amplifier |
| US20170164127A1 (en) * | 2015-12-04 | 2017-06-08 | Nxp B.V. | Audio processing system |
| CN209134366U (en) * | 2018-11-27 | 2019-07-19 | 南京拓途电子有限公司 | A kind of standby heating system of switched mode power amplifier |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20190108 |
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| WW01 | Invention patent application withdrawn after publication |