CN206061108U - A kind of power control circuit exported based on audio amplifier - Google Patents
A kind of power control circuit exported based on audio amplifier Download PDFInfo
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- CN206061108U CN206061108U CN201621050229.7U CN201621050229U CN206061108U CN 206061108 U CN206061108 U CN 206061108U CN 201621050229 U CN201621050229 U CN 201621050229U CN 206061108 U CN206061108 U CN 206061108U
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Abstract
This utility model belongs to audio amplifier control circuit technical field, more particularly to a kind of power control circuit exported based on audio amplifier.In this utility model embodiment, the power control circuit exported based on audio amplifier arranges feedback circuit between loudspeaker and the second amplifier, reached with this, final output is constant to keep constant, so that the tonequality of sound box system is protected, distortion is effectively controlled.
Description
Technical field
This utility model belongs to audio amplifier control circuit technical field, more particularly to a kind of Power Control exported based on audio amplifier
Circuit.
Background technology
Audio amplifier refers to a kind of equipment that audio signal can be transformed to sound.Speaker main casing or low just refer in popular is said
Power amplifier is carried in sound receiver body, sound is played back out in itself by audio amplifier after process is amplified to audio signal so as to sound
The change of tune is big.
Current speaker products design, after analog amplifier or digital power amplifier output, is directly accessed loudspeaker.Without again
Do more power designs controls.Therefore, when input signal is excessive, sound box system has that distortion is serious.
Utility model content
The purpose of this utility model embodiment is to provide a kind of power control circuit exported based on audio amplifier, it is intended to solved
Now when input signal is excessive, sound box system has that distortion is serious.
This utility model embodiment is achieved in that a kind of power control circuit exported based on audio amplifier, including successively
The Bluetooth chip of connection, the first amplifier, the second amplifier, power amplifier and loudspeaker, the power control circuit exported based on audio amplifier is also
Including the feedback circuit being connected between the loudspeaker and the second amplifier, the feedback circuit includes being connected to the loudspeaker in turn
And second rectification module between amplifier, the first feedback module and the second feedback module.
In said structure, the rectification module includes diode D4 and diode D5, the diode D4 and diode D5
Anode connect the loudspeaker respectively, the negative electrode of the diode D4 and diode D5 connects first feedback module together.
In said structure, first feedback module includes：
Chip U3, resistance R61, resistance R66, resistance R67, resistance R68, resistance R69, resistance R71, resistance R73, electric capacity
C77, electric capacity C79, electric capacity C81, electric capacity C84 and audion Q3；
The first negative input 1IN- of the chip U3 connects the negative electrode of the diode D5, the electricity by resistance R66
Resistance R61 is connected between the first negative input 1IN- of the chip U3 and ground, first electrode input end of the chip U3
1IN+ meets power supply DC_PA by the resistance R69 and resistance R68 for connecting, and the electric capacity C77, resistance R71 and electric capacity C79 are connected in parallel on
Between the first electrode input end 1IN+ of the chip U3 and ground, the first outfan 1OUT of the chip U3 passes through the resistance
R67 connects the base stage of the audion Q3, and the resistance R73 and electric capacity C81 is connected in parallel on the power end VDD of the chip U3 and three poles
Between the base stage of pipe Q3, the electric capacity C84 is connected between the power end VDD and ground of the chip U3, the audion Q3's
Emitter stage meets the power end VDD of the chip U3, and the colelctor electrode of the audion Q3 connects second feedback module.
In said structure, second feedback module includes that chip U8, the two input IN of the chip U8 connect described three
The colelctor electrode of pole pipe Q3, the two outfan OUT of the chip U8 connect second amplifier.
In this utility model embodiment, the power control circuit exported based on audio amplifier is set between loudspeaker and the second amplifier
Feedback circuit is put, is reached with this, final output is constant to keep constant, from
And the tonequality of sound box system is protected, distortion is effectively controlled.
Description of the drawings
Fig. 1 is the function structure chart of the power control circuit exported based on audio amplifier that this utility model embodiment is provided；
Fig. 2 is the circuit structure diagram of the power control circuit exported based on audio amplifier that this utility model embodiment is provided.
Specific embodiment
In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and enforcement
Example, is further elaborated to this utility model.It should be appreciated that specific embodiment described herein is only to explain
This utility model, is not used to limit this utility model.
Fig. 1 shows the modular structure of the power control circuit exported based on audio amplifier that this utility model embodiment is provided,
For convenience of description, illustrate only the part related to this utility model embodiment.
A kind of power control circuit exported based on audio amplifier, including the Bluetooth chip 1 being sequentially connected, the first amplifier 2, second
Amplifier 3, power amplifier 4 and loudspeaker 5, the power control circuit exported based on audio amplifier also include being connected to the loudspeaker 5 and second
Feedback circuit between amplifier 3, the feedback circuit include the rectification being connected in turn between the loudspeaker 5 and the second amplifier 3
Module 6, the first feedback module 7 and the second feedback module 8.
Fig. 2 shows the circuit structure of the power control circuit exported based on audio amplifier that this utility model embodiment is provided,
For convenience of description, illustrate only the part related to this utility model embodiment.
Used as one embodiment of this utility model, the rectification module 6 includes diode D4 and diode D5, the diode
The anode of D4 and diode D5 connects the loudspeaker 5 respectively, and the negative electrode of the diode D4 and diode D5 connects described first together
Feedback module 7.
Used as one embodiment of this utility model, first feedback module 7 includes：
Chip U3, resistance R61, resistance R66, resistance R67, resistance R68, resistance R69, resistance R71, resistance R73, electric capacity
C77, electric capacity C79, electric capacity C81, electric capacity C84 and audion Q3；
The first negative input 1IN- of the chip U3 connects the negative electrode of the diode D5, the electricity by resistance R66
Resistance R61 is connected between the first negative input 1IN- of the chip U3 and ground, first electrode input end of the chip U3
1IN+ meets power supply DC_PA by the resistance R69 and resistance R68 for connecting, and the electric capacity C77, resistance R71 and electric capacity C79 are connected in parallel on
Between the first electrode input end 1IN+ of the chip U3 and ground, the first outfan 1OUT of the chip U3 passes through the resistance
R67 connects the base stage of the audion Q3, and the resistance R73 and electric capacity C81 is connected in parallel on the power end VDD of the chip U3 and three poles
Between the base stage of pipe Q3, the electric capacity C84 is connected between the power end VDD and ground of the chip U3, the audion Q3's
Emitter stage meets the power end VDD of the chip U3, and the colelctor electrode of the audion Q3 connects second feedback module 8.
Used as one embodiment of this utility model, second feedback module 8 includes chip U8, two inputs of the chip U8
End IN connects the colelctor electrode of the audion Q3, and the two outfan OUT of the chip U8 connect second amplifier 3.
Operation principle：
SPK_P and SPK_N are that the loudspeaker 5 of audio amplifier are exported, and through the D4 of rectification module 6, D5 carries out rectification, then through input
Control resistance R61 and R66 calculate normal value A.The reference voltage of the chip U3 of the first feedback module 7 through resistance R68,
R69, R71 carry out calculating reference value C.
Work as A<During C, audion Q3 cut-off, SATT_BIAS signals be low-voltage, the second feedback module 8 include chip U8 close
Close, the input of power amplifier is exactly the input of sound box system itself.
Work as A>During C (explanation system output power excessive), audion Q3 conductings, SATT_BIAS signals are high voltage, second
Feedback module 8 starts, and export-restriction signal is given to the output of the second amplifier 3, i.e. AMP_R_PIN and AMP_R_NIN, this 2 letters
Number now it is changed into normal signal, is given to power amplifier 4, the power of final output just recovers normal power.
In this utility model embodiment, the power control circuit exported based on audio amplifier is set between loudspeaker and the second amplifier
Feedback circuit is put, is reached with this, final output is constant to keep constant, from
And the tonequality of sound box system is protected, distortion is effectively controlled.
Preferred embodiment of the present utility model is the foregoing is only, it is not to limit this utility model, all at this
Any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in this utility model
Protection domain within.
Claims (4)
1. it is a kind of based on audio amplifier export power control circuit, it is characterised in that including the Bluetooth chip being sequentially connected, first fortune
Put, the second amplifier, power amplifier and loudspeaker, the power control circuit exported based on audio amplifier also includes being connected to the loudspeaker and the
Feedback circuit between two amplifiers, the feedback circuit include the rectification mould being connected in turn between the loudspeaker and the second amplifier
Block, the first feedback module and the second feedback module.
2. the power control circuit for being exported based on audio amplifier as claimed in claim 1, it is characterised in that the rectification module includes
The anode of diode D4 and diode D5, the diode D4 and diode D5 connects the loudspeaker respectively, the diode D4 and
The negative electrode of diode D5 connects first feedback module together.
3. the power control circuit for being exported based on audio amplifier as claimed in claim 2, it is characterised in that first feedback module
Including：
Chip U3, resistance R61, resistance R66, resistance R67, resistance R68, resistance R69, resistance R71, resistance R73, electric capacity C77, electricity
Hold C79, electric capacity C81, electric capacity C84 and audion Q3；
The first negative input 1IN- of the chip U3 meets the negative electrode of the diode D5, the resistance R61 by resistance R66
It is connected between the first negative input 1IN- of the chip U3 and ground, the first electrode input end 1IN+ of the chip U3 leads to
The resistance R69 and resistance R68 for crossing series connection meets power supply DC_PA, and the electric capacity C77, resistance R71 and electric capacity C79 are connected in parallel on the core
Between the first electrode input end 1IN+ of piece U3 and ground, the first outfan 1OUT of the chip U3 is connect by the resistance R67
The base stage of the audion Q3, the resistance R73 and electric capacity C81 are connected in parallel on the power end VDD and audion Q3 of the chip U3
Base stage between, the electric capacity C84 is connected between the power end VDD and ground of the chip U3, the transmitting of the audion Q3
Pole meets the power end VDD of the chip U3, and the colelctor electrode of the audion Q3 connects second feedback module.
4. the power control circuit for being exported based on audio amplifier as claimed in claim 3, it is characterised in that second feedback module
Including chip U8, the two input IN of the chip U8 connect the colelctor electrode of the audion Q3, two outfans of the chip U8
OUT connects second amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621050229.7U CN206061108U (en) | 2016-09-12 | 2016-09-12 | A kind of power control circuit exported based on audio amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621050229.7U CN206061108U (en) | 2016-09-12 | 2016-09-12 | A kind of power control circuit exported based on audio amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206061108U true CN206061108U (en) | 2017-03-29 |
Family
ID=58370238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621050229.7U Active CN206061108U (en) | 2016-09-12 | 2016-09-12 | A kind of power control circuit exported based on audio amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206061108U (en) |
-
2016
- 2016-09-12 CN CN201621050229.7U patent/CN206061108U/en active Active
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