CN206585744U - Playback equipment - Google Patents
Playback equipment Download PDFInfo
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- CN206585744U CN206585744U CN201720196084.XU CN201720196084U CN206585744U CN 206585744 U CN206585744 U CN 206585744U CN 201720196084 U CN201720196084 U CN 201720196084U CN 206585744 U CN206585744 U CN 206585744U
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Abstract
The utility model discloses a kind of playback equipment, including signal processing circuit, main control circuit, regulation circuit, booster circuit, power amplification circuit and power input unit；The output end of power input unit and the input of booster circuit are connected, and the output end of booster circuit and the power input of power amplification circuit are connected, and the controlled end of booster circuit is connected with adjusting the adjustment end of circuit；First control end of the controlled end and main control circuit that adjust circuit is connected, and the feedback end of main control circuit and the first output end of signal processing circuit are connected；When the amplitude that signal processing circuit detects the audio signal of input reduces, corresponding feedback signal is exported to main control circuit, main control circuit exports the pwm signal with feedback signal duty ratio corresponding to circuit is adjusted, so that regulation circuit turns down the output voltage of booster circuit.Technical solutions of the utility model can reduce the energy loss of playback equipment.
Description
Technical field
The utility model is related to playback equipment technical field, more particularly to a kind of playback equipment.
Background technology
Existing playback equipment includes power input unit, power amplification circuit and loudspeaker.Wherein, power input unit is used
In the operating voltage that fixed size is provided for power amplification circuit, power amplification circuit is used to the audio signal of input carrying out work(
Rate enhanced processing is simultaneously exported to loudspeaker, so that loudspeaker send sound corresponding with the audio signal inputted.
However, when audio signal amplitude is reduced, the power output of power amplification circuit reduces, power amplification circuit it is defeated
Enter power but to remain unchanged because being fixed input voltage size, electric energy loss is larger.
Utility model content
Main purpose of the present utility model is to provide a kind of playback equipment, it is intended to reduce the electric energy loss of the playback equipment.
To achieve the above object, the utility model proposes a kind of playback equipment, it is characterised in that including signal transacting electricity
Road, main control circuit, regulation circuit, booster circuit, power amplification circuit and power input unit；The power input unit
Output end is connected with the input of the booster circuit, the output end of the booster circuit and the power supply of the power amplification circuit
Input is connected, and the controlled end of the booster circuit is connected with the adjustment end of the regulation circuit；It is described to adjust the controlled of circuit
End is connected with the first control end of the main control circuit, the feedback end of the main control circuit and the signal processing circuit
First output end is connected；When the amplitude that the signal processing circuit detects the audio signal of input reduces, export corresponding
Feedback signal to the main control circuit, the main control circuit exports the pwm signal with the feedback signal duty ratio corresponding
To the regulation circuit, so that the regulation circuit turns down the output voltage of the booster circuit.
Preferably, the booster circuit includes boosting unit, first resistor and second resistance, the first of the first resistor
Hold as the output end of the booster circuit, the second end, the first end of the second resistance and the boosting of the first resistor
The feedback end interconnection of unit, its connecting node is the controlled end of the booster circuit, the second end ground connection of the second resistance.
Preferably, the boosting unit include BOOST boost chips, the 12nd resistance, the tenth electric capacity, second transistor,
First diode and the first inductance, the first end of first inductance are the input of the booster circuit, first inductance
The second end, the anode interconnection of the input of the second transistor and first diode, the second transistor by
Control end is connected with the second end of the 12nd resistance, first end and the BOOST boost chips of the 12nd resistance
Drive end is connected, the output head grounding of the second transistor, the negative electrode of first diode, the first of the tenth electric capacity
The first end interconnection of end and the first resistor, its connecting node is the output end of the booster circuit, the tenth electric capacity
Second end is grounded, and the feedback end of the BOOST boost chips is the feedback end of the boosting unit.
Preferably, the boosting unit also includes the 4th resistance, the 5th resistance, the 6th resistance, the first electric capacity and the second electricity
Hold, the first end of the 4th resistance is connected with the first end of first inductance, its connecting node is the booster circuit
Input, the second end of the 4th resistance, the first end of the 5th resistance, the first end of first electric capacity, described
The power input interconnection of the first end of two electric capacity and the BOOST boost chips, the second end of the 5th resistance, described the
The overvoltage protection end interconnection of the first end of six resistance and the BOOST boost chips, the second end of the 6th resistance, described the
Second end of one electric capacity and the second end of second electric capacity are grounded.
Preferably, the model LM3841 of the BOOST boost chips.
Preferably, the regulation circuit includes the first transistor and 3rd resistor, and the controlled end of the first transistor is
It is described regulation circuit controlled end, the output head grounding of the first transistor, the input of the first transistor with it is described
The second end connection of 3rd resistor, the first end of the 3rd resistor is the adjustment end for adjusting circuit.
Preferably, the regulation circuit also includes the 18th resistance, the 19th resistance and the 14th electric capacity, the described 18th
The first end of resistance, the first end of the 19th resistance, the first end of the 14th electric capacity and the first transistor
Controlled end is interconnected, and the second end of the 19th resistance is the controlled end for adjusting circuit, the second of the 18th resistance
The output end at end, the second end of the 14th electric capacity and the first transistor is grounded.
Preferably, the signal processing circuit also includes the second output end, the second output end of the signal processing circuit
It is connected with the signal input part of the power amplification circuit.
Preferably, the playback equipment also includes on-off circuit, the input of the on-off circuit and the booster circuit
Output end connection, the output end of the on-off circuit is connected with the power input of the power amplification circuit, the switch
The controlled end of circuit is connected with the second control end of the main control circuit.
Preferably, the on-off circuit includes the 14th resistance, the 15th resistance, the 16th resistance, the 17th resistance, the
15 electric capacity, the 16th electric capacity, the 17th electric capacity, the 18th electric capacity, third transistor and PMOS switch chip, the described 14th
The first end of resistance, the first end of the 15th electric capacity, the S1 pin of the switch chip, the S2 pin of the switch chip and institute
The S3 pin interconnection of switch chip is stated, its connecting node is the input of the on-off circuit；Second end of the 14th resistance,
The first end of 15th resistance, the second end of the 15th electric capacity, the G1 pin of the switch chip and the described 16th
The second end interconnection of electric capacity, the second end of the 15th resistance is connected with the input of the third transistor, and the described 3rd
The controlled end of transistor, the first end of the 16th resistance, the first end of the 17th resistance and the 18th electric capacity
First end interconnection, the output end of the third transistor, the second end of the 16th resistance and the 18th electric capacity
Second end is grounded, and the second end of the 17th resistance is the controlled end of the on-off circuit；The of 16th electric capacity
One end, the D1 pin of the switch chip, the D2 pin of the switch chip, the D3 pin of the switch chip, the switch chip
The first end interconnection of D4 pin and the 17th electric capacity, its connecting node is the output end of the on-off circuit, the described 17th
The second end ground connection of electric capacity.
When the audio signal amplitude of input reduces：
The supply voltage of power amplification circuit in existing playback equipment is constant.
Signal processing circuit in this playback equipment exports feedback signal corresponding with current audio signals amplitude to master control
Circuit processed, the pwm signal of main control circuit output duty ratio corresponding turns down the output of booster circuit to circuit, regulation circuit is adjusted
Voltage, and then reduce the supply voltage of power amplification circuit.
Because the power attenuation of power amplification circuit is quiet equal to the supply voltage and power amplification circuit of power amplification circuit
The product of state loss (electric current)；And for same power amplification circuit, its quiescent dissipation (electric current) is substantially stationary.
Therefore, when audio signal amplitude is reduced, the power attenuation of existing playback equipment sound intermediate frequency amplifying circuit is more than this
The power attenuation of playback equipment sound intermediate frequency amplifying circuit.That is, relative to prior art, technical solutions of the utility model are reduced
The electric energy loss of playback equipment.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the accompanying drawing used required in description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to the structure shown in these accompanying drawings.
Fig. 1 is the high-level schematic functional block diagram of the embodiment of the utility model playback equipment one；
Fig. 2 is the electrical block diagram of another embodiment of the utility model playback equipment.
Drawing reference numeral explanation：
| Label | Title | Label | Title | Label | Title |
| 10 | Signal processing circuit | C1 | First electric capacity | R1 | First resistor |
| 20 | Main control circuit | C2 | Second electric capacity | R2 | Second resistance |
| 30 | Adjust circuit | C3 | 3rd electric capacity | R3 | 3rd resistor |
| 40 | Booster circuit | C4 | 4th electric capacity | R4 | 4th resistance |
| 50 | Power amplification circuit | C5 | 5th electric capacity | R5 | 5th resistance |
| 60 | Power input unit | C6 | 6th electric capacity | R6 | 6th resistance |
| 70 | On-off circuit | C7 | 7th electric capacity | R7 | 7th resistance |
| 41 | Boosting unit | C8 | 8th electric capacity | R8 | 8th resistance |
| U1 | Boost chip | C9 | 9th electric capacity | R9 | 9th resistance |
| U2 | Switch chip | C10 | Tenth electric capacity | R10 | Tenth resistance |
| Q1 | The first transistor | C11 | 11st electric capacity | R11 | 11st resistance |
| Q2 | Second transistor | C12 | 12nd electric capacity | R12 | 12nd resistance |
| Q3 | Third transistor | C13 | 13rd electric capacity | R13 | 13rd resistance |
| L1 | First inductance | C14 | 14th electric capacity | R14 | 14th resistance |
| D1 | First diode | C15 | 15th electric capacity | R15 | 15th resistance |
| D2 | Second diode | C16 | 16th electric capacity | R16 | 16th resistance |
| R19 | 19th resistance | C17 | 17th electric capacity | R17 | 17th resistance |
| R20 | 20th resistance | C18 | 18th electric capacity | R18 | 18th resistance |
Realization, functional characteristics and the advantage of the utility model purpose will be done furtherly referring to the drawings in conjunction with the embodiments
It is bright.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present utility model, rather than all
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, belongs to the scope of the utility model protection.
It is to be appreciated that institute is directional in the utility model embodiment indicates (such as up, down, left, right, before and after ...)
Relative position relation, motion conditions for being only used for explaining under a certain particular pose (as shown in drawings) between each part etc., if
The particular pose changes, then directionality indicates also correspondingly therewith to change.
In addition, the description for being related to " first ", " second " etc. in the utility model is only used for describing purpose, without being understood that
To indicate or implying its relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ",
At least one this feature can be expressed or be implicitly included to the feature of " second ".In addition, the technical side between each embodiment
Case can be combined with each other, but must can be implemented as basis with those of ordinary skill in the art, when the combination of technical scheme
It will be understood that the combination of this technical scheme is not present when appearance is conflicting or can not realize, also not in the utility model requirement
Protection domain within.
The utility model proposes a kind of playback equipment.The playback equipment is to refer to the audio signal of input carrying out power
Enhanced processing and the electronic equipment exported, such as, television set, audio amplifier, radio, mobile phone etc..
It is noted that here, audio signal can come from inside playback equipment, also may be from inside playback equipment.
Such as, when playback equipment is mobile phone, audio may be from interior of mobile phone；When playback equipment is audio amplifier, audio signal may be from
Outside audio amplifier.
In addition, playback equipment can include internal battery, internal battery can not also be included.It is understood that including
The playback equipment of internal battery is easy to carry, the playback equipment small volume not including internal battery.
Hereinafter, with reference to Fig. 1 and Fig. 2, technical solutions of the utility model are described in detail.
Referring to Fig. 1, in the first embodiment, above-mentioned playback equipment include signal processing circuit 10, main control circuit 20,
Adjust circuit 30, booster circuit 40, power amplification circuit 50 and power input unit 60.
Wherein, signal processing circuit 10 is used for the amplitude for detecting the audio signal of input, and exports corresponding feedback signal
To main control circuit 20.General, the amplitude of the audio signal of input is bigger, the feedback signal that signal processing circuit 10 is exported
Amplitude is also bigger.Here, the amplitude that may also set up the audio signal of input is bigger, the feedback signal that signal processing circuit 10 is exported
Amplitude it is smaller.
Main control circuit 20 is used to export the pwm signal of duty ratio corresponding extremely according to the amplitude output of the feedback signal of input
Adjust circuit 30.General, the amplitude of the feedback signal of input is bigger, the dutycycle for the pwm signal that main control circuit 20 is exported
It is bigger.Here, the amplitude that may also set up the feedback signal of input is bigger, the dutycycle of the pwm signal of main control circuit output is got over
It is small.
Booster circuit, for the output voltage of power input unit 60 to be carried out into boosting processing, thinks power amplification circuit
50 power supplies, also, output voltage size is adjusted according to the pwm signal of input.General, when the pwm signal of input is high level
When, the output voltage of booster circuit 40 is larger, when the pwm signal of input is low level, the output voltage of booster circuit 40 compared with
It is small.Here, may also set up, when the pwm signal of input is high level, the output voltage of booster circuit 40 is smaller.
It is preferred that the output end of power input unit 60 is connected with the input of booster circuit 40, booster circuit 40 it is defeated
Go out end to be connected with the power input of power amplification circuit 50, the adjustment end of the controlled end and regulation circuit 30 of booster circuit 40 connects
Connect；The controlled end of regulation circuit 30 is connected with the first control end of main control circuit 20, the feedback end and letter of main control circuit 20
The first output end connection of number process circuit 10.
It is assumed that when the pwm signal that main control circuit 20 is exported is high level, the output voltage of booster circuit 40 is V1；
When the pwm signal that main control circuit 20 is exported is low level, the output voltage of booster circuit 40 is V2；The cycle of pwm signal
For T, the quiescent dissipation of power amplification circuit 50 is I.Then, in the course of work of this playback equipment：
0~T time section, the amplitude of the audio signal of input is A1, and signal processing circuit 10 exports corresponding feedback signal,
Its amplitude is B1, and main control circuit 20 exports corresponding pwm signal, and the T1 of high level lasting time, dutycycle is T1/T.
In time period, in playback equipment, the energy that power amplification circuit 50 is consumed is W1, and
W1=V1 × I × T1+V2 × I × (T-T1)=V2 × I × T+ (V1-V2) × I × T1.
T~2T periods, the amplitude of the audio signal of input is A2, and signal processing circuit 10 exports corresponding feedback letter
Number, its amplitude is B2, and main control circuit 20 exports corresponding pwm signal, and high level lasting time is T2, and dutycycle is T2/T.
In time period, in playback equipment, the energy that power amplification circuit 50 is consumed is W2, and
W2=V1 × I × T2+V2 × I × (T-T2)=V2 × I × T+ (V1-V2) × I × T2.
Due to V1>V2, therefore, if, A1>A2；
Then, B1>B2, T1>T2；
Then, (V1-V2) × I × T1>(V1-V2) × I × T2, W1>W2.
It follows that for this playback equipment, when the amplitude of the audio signal of input reduces, power amplification electricity therein
The energy that road 50 is consumed will be reduced, therefore, and technical solutions of the utility model, which can reach, reduces the electric energy that playback equipment is consumed
Purpose.Also, the high level lasting time (T1 or T2) for the pwm signal that main control circuit 20 is exported is shorter, power amplification electricity
The energy that road 50 is consumed is fewer.
Based on above-mentioned first embodiment, referring to Fig. 2, in a second embodiment：
Above-mentioned booster circuit 40 includes boosting unit 41, first resistor R1 and second resistance R2, the first of first resistor R1
Hold as the output end of booster circuit 40, first resistor R1 the second end, second resistance R2 first end and boosting unit 41 it is anti-
End interconnection is presented, its connecting node is the controlled end of booster circuit 40, second resistance R2 the second end ground connection.Regulation circuit 30 includes
The first transistor Q1 and 3rd resistor R3, the first transistor Q1 controlled end are the controlled end of regulation circuit 30, the first transistor
Q1 output head grounding, the first transistor Q1 input is connected with 3rd resistor R3 the second end, and the first of 3rd resistor R2
Hold to adjust the adjustment end of circuit 30.
In the present embodiment, it is assumed that the first transistor Q1 is that N-MOS is managed or NPN type triode, and its conduction loss is zero,
First resistor R1 resistance is R1, and second resistance R2 resistance is R2, and 3rd resistor R3 resistance is R3, is fallen in boosting unit 41
Feedback end voltage be VB, fall the output end of booster circuit 40 voltage be VA.Here, falling the feedback in boosting unit 41
The voltage VB sizes at end are constant.
Then, when the pwm signal of input is high level, the first transistor Q1 conductings have electric current to flow through 3rd resistor R3, and
VA=VB × (R1+R2 | | R3)/(R2 | | R3)；
When the pwm signal of input is low level, the first transistor Q1 cut-offs, no electric current flows through 3rd resistor R3, and
VA=VB × (R1+R2)/R2；
Understand according to the above, for regulation circuit 30, when the pwm signal of input is high level, promotion that its is adjustable
The output voltage of volt circuit 40, when the pwm signal of input is low level, it can turn down the output voltage of booster circuit 40, from
And reach the purpose of reduction electric energy loss.
If being managed or PNP type triode it is understood that the first transistor Q1 is P-MOS, when the pwm signal of input
During for high level, regulation circuit 30 can turn down the output voltage of booster circuit 40, when the pwm signal of input is low level,
Regulation circuit 30 can heighten the output voltage of booster circuit 40.The type selecting to the first transistor Q1 is not limited herein, only with
The first transistor Q1 be N-MOS pipes exemplified by illustrate.
It is preferred that above-mentioned boosting unit 41 includes model LM3481 boost chip U1, the 4th resistance R4, the 5th resistance
R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the 11st resistance R11, the tenth
Two resistance R12, the 13rd resistance R13, the 20th resistance R20, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electricity
Hold C4, the 5th electric capacity C5, the 6th electric capacity C6, the 7th electric capacity C7, the 8th electric capacity C8, the 9th electric capacity C9, the tenth electric capacity C10, the tenth
One electric capacity C11, the 12nd electric capacity C12, the 13rd electric capacity C13, the first inductance L1, the first diode D1, the second diode D2 and
Second transistor Q2；4th resistance R4 first end, the 3rd electric capacity C3 positive pole, the 4th electric capacity C4 first end, the 5th electric capacity
C5 first end and the interconnection of the first inductance L1 first end, its connecting node is the input of booster circuit 40；4th resistance R4
The second end, the 5th resistance R5 first end, the first electric capacity C1 first end, the second electric capacity C2 first end and boost chip U1
The interconnection of VIN pin, the UVLO pin interconnection at the 5th resistance R5 the second end, the 6th resistance R6 first end and boost chip U1, the
Second end at six resistance R6 the second end, the first electric capacity C1 the second end and the second electric capacity C2 is grounded, and the 3rd electric capacity C3's is negative
Second end of pole, the 4th electric capacity C4 the second end and the 5th electric capacity C5 is grounded；First inductance L1 the second end, second transistor
Q2 input, the 13rd resistance R13 first end, the first diode D1 anode and the second diode D2 anode interconnection,
13rd resistance R13 the second end is connected with the 9th electric capacity C9 first end, the 9th electric capacity C9 the second end, the first diode D1
Negative electrode, the second diode D2 negative electrode, the tenth electric capacity C10 first end, the 11st electric capacity C11 first end, the 12nd electricity
Hold the first end interconnection of C12 positive pole and first resistor R1, its connecting node is the output end of booster circuit 40, the tenth electric capacity
C10 the second end, the 11st electric capacity C11 the second end and the 12nd electric capacity C12 negative pole is grounded；Second transistor Q2's is defeated
Go out end, the 8th resistance R8 first end, the 9th resistance R9 first end, the tenth resistance R10 first end and the 11st resistance R11
First end interconnection, the ISEN pin at the 11st resistance R11 the second end, the 13rd electric capacity C13 first end and boost chip U1
Interconnection, the 8th resistance R8 the second end, the 9th resistance R9 the second end, the tenth resistance R10 the second end and the 13rd electric capacity C13
The second end be grounded；Second transistor Q2 controlled end is connected with the 12nd resistance R12 the second end, the 12nd resistance R12
First end be connected with boost chip U1 DR pin, boost chip U1 VCC pin are connected with the 8th electric capacity C8 first end, the 8th
Electric capacity C8 the second end ground connection；Boost chip U1 FGND pin ground connection, the of boost chip U1 FA pin and the 20th resistance R20
One end is connected, the 20th resistance R20 the second end ground connection；Boost chip U1 COMP pin and the 6th electric capacity C6 first end connect
Connect, the 6th electric capacity C6 the second end is connected with the 7th resistance R7 first end, the 7th resistance R7 the second end ground connection, boost chip
U1 FB pin are connected with the 7th electric capacity C7 first end, and its connecting node is the feedback end of boosting unit 41, the 7th electric capacity C7's
Second end is grounded, boost chip U1 AGND pins ground connection.
Here, have it is following some need explanation：
(1) in the present embodiment, as long as boost chip U1 BOOST topological structures, its model is not limited to LM3481, than
Such as, model SY7901, SY7982, NPS9428 boost chip U1.Based on LM3481 chips, only need to set up the first inductance L1,
First diode D1, the 12nd resistance R12, the tenth electric capacity C10 and second transistor Q2 can just realize boost function.
(2) the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 the first electric capacity C1 and the second electric capacity C2 are set up, can be made
Boost chip U1 monitors the supply voltage of input booster circuit 40 in real time, and then realizes over-voltage protecting function.
(3) the 3rd electric capacity C3, the 4th electric capacity C4 and the 5th electric capacity C5 are set up, the first inductance of input L1 power supply electricity can be made
Pressure is more stable.
(4) the 13rd resistance R13, the 9th electric capacity C9, the 11st electric capacity C11 and the 12nd electric capacity C12 are set up, liter can be made
The output voltage of volt circuit 40 is more stable.
(5) the 8th resistance R8 of increase, the 9th resistance R9, the tenth resistance R10, the 11st resistance R11 and the 13rd electric capacity
C13, can facilitate boost chip U1 to detect the output current of booster circuit 40, so as to realize the overcurrent protection work(of booster circuit 40
Energy.
The loop compensation circuit (figure is not marked) that (6) the 7th resistance R7 and the 6th electric capacity C6 are boost chip U1, the 20th
Resistance R20 can be used for the working frequency for adjusting boost chip U1, and control boost chip U1 enable.
It is preferred that above-mentioned regulation circuit 30 also includes the 18th resistance R18, the 19th resistance R19 and the 14th electric capacity
C14, the 18th resistance R18 first end, the 19th resistance R19 first end, the 14th electric capacity C14 first end and the first crystalline substance
Body pipe Q1 controlled end interconnection, the 19th resistance R19 the second end is the controlled end of regulation circuit 30, the 18th resistance R18's
The output end at the second end, the 14th electric capacity C14 the second end and the first transistor Q1 is grounded.
It is noted that above-mentioned signal processing circuit 10 also includes the second output end, the second of signal processing circuit 10
Output end is connected with the signal input part of power amplification circuit 50.In this way, signal processing circuit 10 can be not only used for detection input
The amplitude of audio signal, can be handled audio signal and be exported to power amplification circuit 50 again.
In addition, above-mentioned playback equipment also includes on-off circuit 70, the input of on-off circuit 70 is defeated with booster circuit 40
Go out end connection, the output end of on-off circuit 70 is connected with the power input of power amplification circuit 50, on-off circuit 70 it is controlled
End is connected with the second control end of main control circuit 20.In this way, when playback equipment shuts down, on-off circuit 70 can be cut off rapidly
The supply access of booster circuit 40 and power amplification circuit 50, and then further reduce the energy loss of playback equipment.
It is preferred that on-off circuit 70 includes the 14th resistance R14, the 15th resistance R15, the 16th resistance R16, the 17th
Resistance R17, the 15th electric capacity C15, the 16th electric capacity C16, the 17th electric capacity C17, the 18th electric capacity C18, third transistor Q3
And PMOS switch chip U2, the 14th resistance R14 first end, the 15th electric capacity C15 first end, switch chip U2 S1
The S3 pin interconnection of pin, switch chip U2 S2 pin and switch chip U2, its connecting node is the input of on-off circuit 70；Tenth
Four resistance R14 the second end, the 15th resistance R15 first end, the 15th electric capacity C15 the second end, switch chip U2 G1
Pin and the 16th electric capacity C16 the second end interconnection, the 15th resistance R15 the second end connects with third transistor Q3 input
Connect, third transistor Q3 controlled end, the 16th resistance R16 first end, the 17th resistance R17 first end and the 18th electricity
Hold C18 first end interconnection, third transistor Q3 output end, the 16th resistance R16 the second end and the 18th electric capacity C18
Second end is grounded, and the 17th resistance R17 the second end is the controlled end of on-off circuit 70；16th electric capacity C16 first end,
Switch chip U2 D1 pin, switch chip U2 D2 pin, switch chip U2 D3 pin, switch chip U2 D4 pin and the 17th electricity
Hold C17 first end interconnection, its connecting node is the output end of on-off circuit 70, the 17th electric capacity C17 the second end ground connection.
Preferred embodiment of the present utility model is the foregoing is only, the scope of the claims of the present utility model is not thereby limited,
It is every under inventive concept of the present utility model, the equivalent structure made using the utility model specification and accompanying drawing content is become
Change, or directly/be used in other related technical fields indirectly and be included in scope of patent protection of the present utility model.
Claims (10)
1. a kind of playback equipment, it is characterised in that including signal processing circuit, main control circuit, regulation circuit, booster circuit,
Power amplification circuit and power input unit；
The output end of the power input unit is connected with the input of the booster circuit, the output end of the booster circuit with
The power input connection of the power amplification circuit, the adjustment end of the controlled end of the booster circuit and the regulation circuit connects
Connect；
The controlled end of the regulation circuit is connected with the first control end of the main control circuit, the feedback of the main control circuit
End is connected with the first output end of the signal processing circuit；
When the amplitude that the signal processing circuit detects the audio signal of input reduces, corresponding feedback signal is exported to described
Main control circuit, the main control circuit exports the pwm signal with the feedback signal duty ratio corresponding to the regulation circuit,
So that the regulation circuit turns down the output voltage of the booster circuit.
2. playback equipment as claimed in claim 1, it is characterised in that the booster circuit includes boosting unit, first resistor
And second resistance, the first end of the first resistor is the output end of the booster circuit, the second end of the first resistor, institute
The first end of second resistance and the feedback end interconnection of the boosting unit are stated, its connecting node is controlled for the booster circuit
End, the second end ground connection of the second resistance.
3. playback equipment as claimed in claim 2, it is characterised in that the boosting unit includes BOOST boost chips, the tenth
Two resistance, the tenth electric capacity, second transistor, the first diode and the first inductance, the first end of first inductance is the liter
The input of volt circuit, the second end of first inductance, the input of the second transistor and first diode
Anode is interconnected, and the controlled end of the second transistor is connected with the second end of the 12nd resistance, the 12nd resistance
First end is connected with the drive end of the BOOST boost chips, the output head grounding of the second transistor, the one or two pole
The first end interconnection of the negative electrode of pipe, the first end of the tenth electric capacity and the first resistor, its connecting node is the boosting
The output end of circuit, the second end ground connection of the tenth electric capacity, the feedback end of the BOOST boost chips is the boosting unit
Feedback end.
4. playback equipment as claimed in claim 3, it is characterised in that the boosting unit also includes the 4th resistance, the 5th electricity
Resistance, the 6th resistance, the first electric capacity and the second electric capacity, the first end of the 4th resistance connect with the first end of first inductance
Connect, its connecting node is the input of the booster circuit, the second end of the 4th resistance, the first of the 5th resistance
The power input at end, the first end of first electric capacity, the first end of second electric capacity and the BOOST boost chips is mutual
Even, the overvoltage protection end of the second end of the 5th resistance, the first end of the 6th resistance and the BOOST boost chips is mutual
Even, the second end of the second end of the 6th resistance, the second end of first electric capacity and second electric capacity is grounded.
5. the playback equipment as described in claim 3 or 4, it is characterised in that the model of the BOOST boost chips
LM3841。
6. the playback equipment as described in claim 1-4 any one, it is characterised in that the regulation circuit includes first crystal
Pipe and 3rd resistor, the controlled end of the first transistor for the regulation circuit controlled end, the first transistor it is defeated
Go out end ground connection, the input of the first transistor is connected with the second end of the 3rd resistor, the first of the 3rd resistor
Hold as the adjustment end of the regulation circuit.
7. playback equipment as claimed in claim 6, it is characterised in that the regulation circuit also includes the 18th resistance, the tenth
Nine resistance and the 14th electric capacity, the first end of the 18th resistance, the first end of the 19th resistance, the 14th electricity
The controlled end interconnection of the first end of appearance and the first transistor, the second end of the 19th resistance is the regulation circuit
Controlled end, the output end at the second end of the 18th resistance, the second end of the 14th electric capacity and the first transistor
It is grounded.
8. playback equipment as claimed in claim 1, it is characterised in that the signal processing circuit also includes the second output end,
Second output end of the signal processing circuit is connected with the signal input part of the power amplification circuit.
9. playback equipment as claimed in claim 1, it is characterised in that the playback equipment also includes on-off circuit, described to open
The input on powered-down road is connected with the output end of the booster circuit, the output end of the on-off circuit and power amplification electricity
The power input connection on road, the controlled end of the on-off circuit is connected with the second control end of the main control circuit.
10. playback equipment as claimed in claim 9, it is characterised in that the on-off circuit includes the 14th resistance, the 15th
Resistance, the 16th resistance, the 17th resistance, the 15th electric capacity, the 16th electric capacity, the 17th electric capacity, the 18th electric capacity, the 3rd crystalline substance
Body pipe and PMOS switch chip, the first end of the 14th resistance, the first end of the 15th electric capacity, the switch chip
S1 pin, the S3 pin interconnection of the S2 pin of the switch chip and the switch chip, its connecting node is the on-off circuit
Input；Second end of the 14th resistance, the first end of the 15th resistance, the second end of the 15th electric capacity,
The second end interconnection of the G1 pin of the switch chip and the 16th electric capacity, the second end of the 15th resistance and described the
The input connection of three transistors, the controlled end of the third transistor, the first end of the 16th resistance, the described 17th
The first end of resistance and the interconnection of the first end of the 18th electric capacity, the output end of the third transistor, the 16th electricity
Second end of resistance and the second end of the 18th electric capacity are grounded, and the second end of the 17th resistance is the on-off circuit
Controlled end；The first end of 16th electric capacity, the D1 pin of the switch chip, the D2 pin of the switch chip, described open
The first end interconnection of the D3 pin, the D4 pin of the switch chip and the 17th electric capacity of chip is closed, its connecting node is described
The output end of on-off circuit, the second end ground connection of the 17th electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720196084.XU CN206585744U (en) | 2017-03-01 | 2017-03-01 | Playback equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720196084.XU CN206585744U (en) | 2017-03-01 | 2017-03-01 | Playback equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206585744U true CN206585744U (en) | 2017-10-24 |
Family
ID=60091769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720196084.XU Expired - Fee Related CN206585744U (en) | 2017-03-01 | 2017-03-01 | Playback equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206585744U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112653400A (en) * | 2020-12-10 | 2021-04-13 | Oppo（重庆）智能科技有限公司 | Amplifying circuit, control method thereof, electronic device, and storage medium |
-
2017
- 2017-03-01 CN CN201720196084.XU patent/CN206585744U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112653400A (en) * | 2020-12-10 | 2021-04-13 | Oppo（重庆）智能科技有限公司 | Amplifying circuit, control method thereof, electronic device, and storage medium |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171024 Termination date: 20210301 |