CN208257776U - A kind of self-adapting load audio power amplifying circuit - Google Patents
A kind of self-adapting load audio power amplifying circuit Download PDFInfo
- Publication number
- CN208257776U CN208257776U CN201821478939.9U CN201821478939U CN208257776U CN 208257776 U CN208257776 U CN 208257776U CN 201821478939 U CN201821478939 U CN 201821478939U CN 208257776 U CN208257776 U CN 208257776U
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- China
- Prior art keywords
- module
- audio
- power amplifier
- divider resistance
- power
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- 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.)
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Abstract
The utility model discloses a kind of self-adapting load audio power amplifying circuits, including power module, sampling module, amplification module, precision rectifying module, MCU module, electronic sound volume module and audio-frequency power amplifier；The sampling module is set between the power module and the anode of the audio-frequency power amplifier, for obtaining the variation of electric current in power module route, the sampling module is connect with the amplification module, amplification module is connect with the precision rectifying module, precision rectifying module is connect with the MCU module, MCU module is connect with the electronic sound volume module, electronic sound volume module is connect with the audio-frequency power amplifier, the electronic sound volume module also has audio input interface, and load is connected on audio-frequency power amplifier.The amplifying circuit makes audio-frequency power amplifier not exceed its maximum power output range, can adapt to the variation of speaker automatically, ensure that the stable work of audio-frequency power amplifier.
Description
Technical field
The utility model relates to amplifying circuit technical field, especially a kind of self-adapting load audio power amplifying circuit.
Background technique
Audio-frequency power amplifier is indispensable equipment during publicity study, amusement, performing art.In the process used
In, the AC impedance of the load (speaker) of audio-frequency power amplifier is variation.Sometimes for emergency, the speaker in 4 Europe may be used
The speaker of the speaker or even 2 Europe that substitute 8 Europe substitutes the speaker in 8 Europe.Such as: it is designed as the power amplifier of 100W/8 Ω, under normal circumstances
Load with 8 Ω, then its output voltage is 28.3V, corresponding electric current should be just 28.3/8=3.54A, power amplifier gain
It is fixed.Assuming that audio-frequency power amplifier input is 1V, then the gain of this power amplifier is exactly 28.3 times；If load becomes
4 Ω, then its output electric current: 28.3/4=7.08A, power also just need 200W, in this case, still regardless of power tube
Power unit may all cannot withstand.
Utility model content
To solve problems of the prior art, the purpose of the utility model is to provide a kind of Audio power amplifier electricity
Road, the amplifying circuit make audio-frequency power amplifier not exceed its maximum power output range, can adapt to speaker automatically
Variation, ensure that the stable work of audio-frequency power amplifier.
A kind of in order to achieve the above purposes, the technical solution adopted by the utility model is: self-adapting load Audio power amplifier
Circuit, including power module, sampling module, amplification module, precision rectifying module, MCU module, electronic sound volume module and power are put
Big device；The sampling module is set between the power module and the anode of the power amplifier, for obtaining power module
The variation of electric current in route, the sampling module are connect with the amplification module, and amplification module is connect with the precision rectifying module,
Precision rectifying module is connect with the MCU module, and MCU module is connect with the electronic sound volume module, electronic sound volume module and institute
Power amplifier connection is stated, which also has audio input interface, load is connected on power amplifier.
As a preferred embodiment, the sampling module is sample resistance, the amplification module is double-width grinding
Single-end output differential amplifier circuit, the sample resistance series connection are set between power module and the anode of power amplifier, sampling
The first divider resistance and the second divider resistance are passed sequentially through between resistance and power module anode and ground connects, sample resistance and function
Third divider resistance and the 4th divider resistance and ground connection, the first divider resistance and second are passed sequentially through between rate amplifier anode
The common end of divider resistance is connect with the negative input end of the double-width grinding Single-end output differential amplifier circuit, third divider resistance
It is connect with the common end of the 4th divider resistance with the positive input terminal of the double-width grinding Single-end output differential amplifier circuit, both-end is defeated
The output end for entering Single-end output differential amplifier circuit is connect with the precision rectifying module.
As another preferred embodiment, the amplification module further includes single ended input Single-end output differential amplification electricity
Road, the single ended input Single-end output differential amplifier circuit be connected to the double-width grinding Single-end output differential amplifier circuit with it is described
Between precision rectifying module.
As another preferred embodiment, the both ends of second divider resistance and the 4th divider resistance are simultaneously
It is associated with filter capacitor.
The beneficial effects of the utility model are: controlling electronic sound volume module by MCU module adjusts input voltage, make audio
Power amplifier ensures that power amplifier, at work most without departing from power supply without departing from its power output range in this way
Heavy load ability ensure that the reliable and stable work of audio-frequency power amplifier, prolong the service life, and reduce after-sales service expense,
Huge economic benefit is brought to enterprise.
Detailed description of the invention
Fig. 1 is the electrical block diagram of the utility model embodiment.
Appended drawing reference: 10, power module, 20, sampling module, 30, amplification module, 31, double-width grinding Single-end output difference
Amplifying circuit, 32, single ended input Single-end output differential amplifier circuit, 40, precision rectifying module, 50, MCU module, 60, electronics sound
Measure module, 70, power amplifier, 71, load.
Specific embodiment
The embodiments of the present invention are described in detail with reference to the accompanying drawing.
Embodiment
As shown in Figure 1, a kind of self-adapting load audio power amplifying circuit, including power module 10, sampling module 20, put
Big module 30, precision rectifying module 40, MCU module 50, electronic sound volume module 60 and power amplifier 70；The sampling module 20
Between the power module 10 and the anode of the power amplifier 70, for obtaining electric current in 10 route of power module
Variation, the sampling module 20 are connect with the amplification module 30, and amplification module 30 is connect with the precision rectifying module 40, accurate
Rectification module 40 is connect with the MCU module 50, and MCU module 50 is connect with the electronic sound volume module 60, electronic sound volume module
60 connect with the power amplifier 70, which also has audio input interface, connect on power amplifier 70
It is connected to load 71.
The sampling module 20 is sample resistance R1, and the amplification module 30 is double-width grinding Single-end output differential amplification electricity
Road 31, the sample resistance R1 series connection are set between power module 10 and the anode of power amplifier 70, sample resistance R1 and electricity
The first divider resistance R2 and the second divider resistance R3 and ground connection, sample resistance R1 and function are passed sequentially through between 10 anode of source module
Third divider resistance R4 and the 4th divider resistance R5 and ground connection, the first divider resistance are passed sequentially through between 70 anode of rate amplifier
The common end of R2 and the second divider resistance R3 are connect with the negative input end of the double-width grinding Single-end output differential amplifier circuit 31,
The common end of third divider resistance R4 and the 4th divider resistance R5 and the double-width grinding Single-end output differential amplifier circuit 31
Positive input terminal connection, the output end of double-width grinding Single-end output differential amplifier circuit 31 are connect with the precision rectifying module 40.
The amplification module 30 further includes single ended input Single-end output differential amplifier circuit 32, the single ended input Single-end output
Differential amplifier circuit 32 be connected to the double-width grinding Single-end output differential amplifier circuit 31 and the precision rectifying module 40 it
Between.
The both ends of the second divider resistance R3 and the 4th divider resistance R5 are parallel with filter capacitor C1, C2.
In the present embodiment, the function of each module is as follows:
Power module 10: the required energy is provided for audio-frequency power amplifier 70；
Sampling module 20:, can be in sampling electricity due to thering is electric current to tide in the route of power module 10 by sample resistance R1
It hinders the both ends R1 and forms voltage difference delta V, Δ V is a very low voltage；
Amplification module 30: since Δ V voltage is very low, so reaching can be sampled by MUC module 50 with regard to needing to amplify
Voltage value；In order to reduce interference, using the two-stage differential amplifying circuit being sequentially connected in series, it can guarantee the signal being amplified in this way
It is the signal of the both ends real sample resistance R1 curent change；Wherein the first divider resistance R2=third divider resistance R4, second
The 4th divider resistance R5 of divider resistance R3=, filter capacitor C1=filter capacitor C2, the first divider resistance R2, the second divider resistance
R3, third divider resistance R4 and the 4th divider resistance R5 be in order to be divided because supply voltage is relatively high, filter capacitor
C1 and filter capacitor C2 is for filtering interference signals.Double-width grinding Single-end output differential amplifier circuit 31 and single ended input are single-ended
The effect of output difference amplifying circuit 32 is exactly to carry out low level signal amplification；
Precision rectifying module 40: the purpose of precision rectifying is exactly that the signal of variation is allowed to be easier to acquire；
MCU module 50: amplified current signal and control electronic sound volume module 60 are acquired；
Electronic sound volume module 60: control is input to the audio signal of power amplifier 70；
Audio-frequency power amplifier 70: carrying out voltage, Current amplifier for small signal, pushes 71 (i.e. speakers) of load to reach
Purpose.
The working principle of the present embodiment is as follows:
Audio-frequency power amplifier 70 is when design, rated power (P0) it has been determined that namely Audio power amplifier
Input sensitivity (the V of device 700) determine, gain (G) determines, the voltage (V of power module 10CC) determine, allow export maximum
Electric current (IMAX) determine, allow export maximum voltage (VMAX) determine.Since input voltage signal changes, or load 71
Change, output power will be with change.The variation of power is divided into following two situation:
(1) nominal load 71, with the increase of input signal, due to the fixed gain of audio-frequency power amplifier 70, audio
Input signal is more than V0Afterwards, the output of audio-frequency power amplifier 70 can overrate.Eventually lead to output square wave.Reality output electricity
Press UOUT=Vi* G works as Vi> V0, then UOUT> VMAX, output power POUT=UOUT 2/ R > P0.Solution: it is always ensured that Vi≤
V0。
(2) applied signal voltage is constant, and load 71 becomes smaller, and will lead to the increase of output electric current, eventually leads to output power
Increase.
Above-mentioned two situations all may cause power module 10 excessively use or power device and excessively use.Finally may be used
Audio-frequency power amplifier 70 can be made to damage.POUT=UOUT 2/ R, R reduce, then POUTIncrease, actual output voltage UOUT=Vi* G, that
By reducing Vi, equally can control output power.
Moreover, 10 power of power module will not generate variation, the output power P of power modulePOWER=UPOWER*IPOWER.Only
Guarantee electric current I≤I of audio-frequency power amplifier 70POWER, then audio-frequency power amplifier 70 can steady operation.Either
Electric current caused by input voltage increases, or load reduces caused electric current and increases, and reduces ViIt can guarantee I≤IPOWER。
The control principle of the present embodiment is: power supply maximum allowed current: IPOWER, it is real when audio-frequency power amplifier works
Then border electric current I adjusts input voltage V by the sampling of curent change in the route to power module 10i, make I≤IPOWER。
Maximum allowable reference voltage V on sampling resistor R1REF=IPOWER* R1, as long as the voltage value V detectedDEC=I*R1 >=VREF, just
Electronic sound volume module 60 can be controlled by MCU module 10 adjust input voltage Vi, until VDEC< VREF.Sound is ensured that in this way
Frequency power amplifier 70, at work without departing from the maximum load capability of power module 10.It ensure that the reliability of whole system.
Specific embodiment of the present utility model above described embodiment only expresses, the description thereof is more specific and detailed,
But it should not be understood as limiting the scope of the patent of the utility model.It should be pointed out that for the common of this field
For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to
In the protection scope of the utility model.
Claims (4)
1. a kind of self-adapting load audio power amplifying circuit, which is characterized in that including power module, sampling module, amplification mould
Block, precision rectifying module, MCU module, electronic sound volume module and audio-frequency power amplifier；The sampling module is set to the power supply
Between module and the anode of the audio-frequency power amplifier, for obtaining the variation of electric current in power module route, the sampling mold
Block is connect with the amplification module, and amplification module is connect with the precision rectifying module, precision rectifying module and the MCU module
Connection, MCU module are connect with the electronic sound volume module, and electronic sound volume module is connect with the audio-frequency power amplifier, the electricity
Consonant amount module also has audio input interface, and load is connected on audio-frequency power amplifier.
2. self-adapting load audio power amplifying circuit according to claim 1, which is characterized in that the sampling module is
Sample resistance, the amplification module are double-width grinding Single-end output differential amplifier circuit, and the sample resistance series connection is set to power supply
Between module and the anode of audio-frequency power amplifier, the first divider resistance is passed sequentially through between sample resistance and power module anode
With the second divider resistance and ground connection, sample resistance and audio-frequency power amplifier anode between pass sequentially through third divider resistance and
4th divider resistance and ground connection, the common end and the double-width grinding Single-end output of the first divider resistance and the second divider resistance
The negative input end of differential amplifier circuit connects, the common end and the double-width grinding list of third divider resistance and the 4th divider resistance
Hold the positive input terminal connection of output difference amplifying circuit, the output end of double-width grinding Single-end output differential amplifier circuit and the essence
Close rectification module connection.
3. self-adapting load audio power amplifying circuit according to claim 2, which is characterized in that the amplification module is also
Including single ended input Single-end output differential amplifier circuit, which is connected to the both-end
It inputs between Single-end output differential amplifier circuit and the precision rectifying module.
4. self-adapting load audio power amplifying circuit according to claim 2 or 3, which is characterized in that described second point
The both ends of piezoresistance and the 4th divider resistance are parallel with filter capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821478939.9U CN208257776U (en) | 2018-09-10 | 2018-09-10 | A kind of self-adapting load audio power amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821478939.9U CN208257776U (en) | 2018-09-10 | 2018-09-10 | A kind of self-adapting load audio power amplifying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208257776U true CN208257776U (en) | 2018-12-18 |
Family
ID=64655178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821478939.9U Withdrawn - After Issue CN208257776U (en) | 2018-09-10 | 2018-09-10 | A kind of self-adapting load audio power amplifying circuit |
Country Status (1)
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|---|---|
| CN (1) | CN208257776U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108880497A (en) * | 2018-09-10 | 2018-11-23 | 四川湖山电器股份有限公司 | A kind of self-adapting load audio power amplifying circuit |
-
2018
- 2018-09-10 CN CN201821478939.9U patent/CN208257776U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108880497A (en) * | 2018-09-10 | 2018-11-23 | 四川湖山电器股份有限公司 | A kind of self-adapting load audio power amplifying circuit |
| CN108880497B (en) * | 2018-09-10 | 2023-08-29 | 四川湖山电器股份有限公司 | Self-adaptive load audio power amplifying circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20181218 Effective date of abandoning: 20230829 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20181218 Effective date of abandoning: 20230829 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |