CN206835344U - The high imported circuit for reducing sound damage - Google Patents
The high imported circuit for reducing sound damage Download PDFInfo
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- CN206835344U CN206835344U CN201720469446.8U CN201720469446U CN206835344U CN 206835344 U CN206835344 U CN 206835344U CN 201720469446 U CN201720469446 U CN 201720469446U CN 206835344 U CN206835344 U CN 206835344U
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Abstract
It the utility model is related to the high imported circuit for reducing sound damage, including power amplifier front end units and amplifier power supply unit, power amplifier front end units, after it receives the HIGH signals of power amplifier, HIGH signals are amplified and the partial pressure of voltage, obtain LINE audio signals and power initiation voltage after amplification；Amplifier power supply unit, it receives power initiation voltage and power amplifier start voltage in itself, and it is start that high voltage can drive CD main frames to have one in two voltages.The utility model passes through differential amplification module, high RST is transformed into low signal, former sound is impaired smaller, when realizing the former car CD main frames connection power amplifier for there was only the output of loudspeaker high-power signal, high-power loudspeaker signal is converted into the LINE audio signals of low-power, the audio for exporting power amplifier is impaired smaller, separates the DC voltage that former car CD main frame loudspeaker signals carry by DC detecting module, controls the switching on and shutting down of power amplifier.
Description
Technical field
Sound equipment is the utility model is related to, more specifically refers to the high imported circuit for reducing sound damage.
Background technology
Automobile audio equipment will also use power amplifier as domestic acoustics, and increasing new car uses now
Monoblock type console, although attractive in appearance, change sound equipment just trouble, most of former car CD main frames are exported without RCA primes
(LINE OUT) pre-output interface, only loudspeaker high-power signal export (HIGH OUT) interface, and power amplifier is it is desirable that low work(
The LINE IN inputs of rate, so former car CD main frames connection power amplifier just needs high-power loudspeaker signal to be converted into low-power
LINEIN audio signals, the circuit in this part of vehicle power amplifier, generally we it is named as high input (HIGH INPUT),
The HIGH INPUT of vehicle power amplifier are most of using passive " height turns low " circuit at present.Passive height, which turns low, to be integrated
Circuit, centre is exactly several resistance and electric capacity, so accurately saying, passive height, which turns low, should be attenuator, and its sound is maximum
Feature, bass is just a lack of, sound is sharply thin and delicate, sounds the sensation for having high load with small power, and sound damage is larger.
Therefore, it is necessary to design a kind of high imported circuit for reducing sound damage, realize pre- defeated without the output of RCA primes
Outgoing interface, when realizing the former car CD main frames connection power amplifier for there was only the output of loudspeaker high-power signal, it can be raised one's voice high-power
Device signal is converted into the LINE audio signals of low-power, and the audio for exporting power amplifier is impaired smaller.
Utility model content
The defects of the purpose of this utility model is to overcome prior art, there is provided the high imported circuit for reducing sound damage.
To achieve the above object, the utility model uses following technical scheme：The high imported circuit for reducing sound damage, including
Power amplifier front end units and amplifier power supply unit, the power amplifier front end units, after it receives the HIGH signals of power amplifier, HIGH is believed
Number it is amplified and the partial pressure of voltage, obtains LINE audio signals and power initiation voltage after amplification；Amplifier power supply unit,
It receives the start voltage of power initiation voltage and power amplifier in itself, and it is that high voltage can drive CD main frames to have one in two voltages
Start.
Its further technical scheme is：The power amplifier front end units include high input module and DC detecting module, institute
High input module is stated, after the HIGH signals for receiving power amplifier, HIGH signals are amplified, LINE audios are believed after obtaining amplification
Number；The DC detecting module, after the HIGH signals for receiving power amplifier, partial pressure is carried out to the voltage of HIGH signals, obtains electricity
Source starts voltage.
Its further technical scheme is：The high input module includes interface, coupled capacitor C1, C2 and differential amplification mould
Block, HIGH signals input from interface, and input is defeated after being compared and enlarged to differential amplification module after coupled capacitor C1, C2
Go out a LINE audio signal.
Its further technical scheme is：Load resistance R3 is also parallel between two interfaces of the interface.
Its further technical scheme is：The differential amplification module includes comparator U1, resistance R4, resistance R5, resistance R6
And resistance R7, the coupled capacitor C1 are connected by resistance R4 with comparator U1 in-phase input end, the coupled capacitor C2
It is connected by resistance R5 with comparator U1 inverting input, resistance R7 is connected in parallel on comparator U1 output end and anti-phase input
Between end, resistance R6 be connected between comparator U1 in-phase input end.
Its further technical scheme is：The DC detecting module includes switching diode D4, D5 and current-limiting resistance
R13, switching diode D4, D5 one end are in parallel with load resistance R3, and the other end is connected with current-limiting resistance R13, current-limiting resistance R13
One end be connected with amplifier power supply unit.
Its further technical scheme is：The amplifier power supply unit includes Switching Power Supply control module, the Switching Power Supply
Control module includes the triode Q4 being connected with power supply, and the start voltage of power initiation voltage and power amplifier in itself is separately input into
Triode Q4 base stage, if Q4 base stage has a high voltage, power supply normal work.
Its further technical scheme is：The Switching Power Supply control module also includes triode Q1, the triode Q1's
Base stage is connected with current-limiting resistance R13 one end, is controlled triode Q5 conducting by DC detecting module and is blocked, to drive CD
The start of main frame and the original state of holding.
Its further technical scheme is：The Switching Power Supply control module also includes triode Q7, triode Q7 base stage
It is connected with current-limiting resistance R13 one end, triode Q7 colelctor electrode is connected with triode Q4 base stage.
The beneficial effect of the utility model compared with prior art is：The imported electricity for reducing sound damage of height of the present utility model
Road, the active height formed by using low-power, the resistance of small size, electric capacity, diode, triode and differential amplification module are defeated
" height the turns low " circuit for entering module to realize, former sound is impaired smaller, and high RST is transformed into low signal, former sound by differential amplification module
It is impaired smaller, when realizing the former car CD main frames connection power amplifier for there was only the output of loudspeaker high-power signal, it can be raised high-power
Sound device signal is converted into the LINE audio signals of low-power, and the audio for exporting power amplifier is impaired smaller, by DC detecting module point
Go out the DC voltage that former car CD main frame loudspeaker signals carry, control the switching on and shutting down of power amplifier, reduce and led from former car CD main frames
One wire solves the problems, such as that wire is long and easily by impulse disturbances caused by car to the trouble on amplifirer.
The utility model is further described with specific embodiment below in conjunction with the accompanying drawings.
Brief description of the drawings
Fig. 1 is the block diagram for the high imported circuit for reducing sound damage that the utility model specific embodiment provides；
Fig. 2 is the circuit theory diagrams for the power amplifier front end units that the utility model specific embodiment provides；
Fig. 3 is the circuit theory diagrams for the amplifier power supply unit that the utility model specific embodiment provides.
Embodiment
In order to more fully understand technology contents of the present utility model, with reference to specific embodiment to skill of the present utility model
Art scheme is further described and illustrated, but is not limited to this.
Specific embodiment as shown in Figures 1 to 3, the high imported circuit for reducing sound damage that the present embodiment provides, Ke Yiyun
, can be by height when realizing the former car CD main frames connection power amplifier for there was only the output of loudspeaker high-power signal in the audio amplifier of automobile
The loudspeaker signal of power is converted into the LINE audio signals of low-power, and the audio for exporting power amplifier is impaired smaller.
The high imported circuit for reducing sound damage, including power amplifier front end units and amplifier power supply unit, power amplifier front end units,
After it receives the HIGH signals of power amplifier, HIGH signals are amplified and the partial pressure of voltage, LINE audios are believed after obtaining amplification
Number and power initiation voltage；Amplifier power supply unit, its start voltage of reception power initiation voltage and power amplifier in itself, two
It is start that high voltage can drive CD main frames to have one in voltage.
Power amplifier front end units realize " height turns low " using active amplifying circuit, and former sound is impaired smaller.Amplifier power supply unit
It is as the startup of power amplifier switch machine by a bigger DC voltage in CD main frame loudspeaker high-power signal output interfaces
Voltage uses.
Further, power amplifier front end units include high input module 10 and DC detecting module 20, the high input
Module 10, after the HIGH signals for receiving power amplifier, HIGH signals are amplified, obtain LINE audio signals after amplification；Institute
DC detecting module 20 is stated, after the HIGH signals for receiving power amplifier, partial pressure is carried out to the voltage of HIGH signals, power supply is obtained and opens
Dynamic voltage.
High input module 10 realizes that height turns low, and DC detecting module 20 is to separate the portion voltage in HIGH signals,
As power initiation voltage, the start for automatic control host machine.
High input module 10 includes interface, coupled capacitor C1, C2 and differential amplification module, and HIGH signals are defeated from interface
Enter, inputted after coupled capacitor C1, C2 to differential amplification module, after being compared and enlarged, export a LINE audio signal.
Load resistance R3 is also parallel between two interfaces of interface.
Differential amplification module includes comparator U1, resistance R4, resistance R5, resistance R6 and resistance R7, the coupled capacitor
C1 is connected by resistance R4 with comparator U1 in-phase input end, and the coupled capacitor C2 passes through resistance R5's and comparator U1
Inverting input is connected, and resistance R7 is connected in parallel between comparator U1 output end and inverting input, and resistance R6 is connected to ground
Between comparator U1 in-phase input end.
HIGH signals input from interface pin 1,2, by after coupled capacitor C1, C2 respectively from differential amplification module just
Negative pole is inputted, and a LINE audio signal is exported after being compared and enlarged, and load resistance R3 is the load resistance of HIGH signals, is made
With the electric current for being reduction HIGH signals.Coupled capacitor C1, C2 is blocking circulation exchange.Resistance R4, R5, R6, R7 and comparator U1
Form a differential amplification module.Usual value is R4=R5, when R6=R7.R6, R7 resistance value ratio R4, R5 resistance are big, LINE sounds
Frequency signal is less than HIGH signals；Conversely, LINE audio signals are amplifications.
Pre-output interface is being exported without RCA primes, the former car CD main frames of only loudspeaker high-power signal output connect
When connecing power amplifier, high-power loudspeaker signal can be connected on vehicle power amplifier machine.
The active electrical formed using low-power, the resistance of small size, electric capacity, diode, triode and differential amplification module
Come " height the turn low " circuit realized, former sound is impaired smaller, and by differential amplification module, high RST is transformed into low signal on road, it
Belong to a kind of audio-frequency amplifier for playing diminution, former sound is impaired smaller.
DC detecting module 20 includes switching diode D4, D5 and current-limiting resistance R13, and the one of switching diode D4, D5
End is in parallel with load resistance R3, and the other end is connected with current-limiting resistance R13, and current-limiting resistance R13 one end and amplifier power supply unit connect
Connect.
CD main frame loudspeakers high-power signal exports (HIGH OUT) interface, there is a bigger DC voltage, this electricity
Pressure is probably the 1/2 of CD host supplying powers, that is HIGH signals carry a DCV close to 6V, and 6V DC voltage flows respectively
Cross switching diode D4, D5, then AUTO_DC_ON points obtain a power initiation voltage and go to control after current-limiting resistance R13
Power circuit.
Further, amplifier power supply unit includes Switching Power Supply control module 30, the Switching Power Supply control module 30
Including the triode Q4 being connected with power supply, the start voltage of power initiation voltage and power amplifier in itself is separately input into triode Q4
Base stage, if Q4 base stage has a high voltage, power supply normal work.
Switching Power Supply control module 30 also includes triode Q1, the base stage of the triode Q1 and the one of current-limiting resistance R13
End connection, is controlled triode Q5 conducting by DC detecting module 20 and is blocked, to drive the start of CD main frames and keep original
State.
Switching Power Supply control module 30 also includes triode Q7, and triode Q7 base stage connects with current-limiting resistance R13 one end
Connect, triode Q7 colelctor electrode is connected with triode Q4 base stage.
The base stage of triode Q4 in circuit is if a high voltage (voltage for being more than 0.5V), the circuit of power unit
Will normal work.AMPLIFIER_TURN_ON_TERMINAL interfaces in figure meet former car CD main frames REM and start line, when
Former car CD main frames have a higher voltage output when opening, and this voltage opens amplifirer enough, usual former car CD master
Machine is to be provided with headstock, and amplifirer is arranged on the tailstock, to lead a wire to amplifirer from former car CD main frames REM OUT interfaces
On REM IN interfaces so that repacking is got up can be cumbersome, and this wire is long, is easily done by pulse caused by car
Disturb.And the DC that AUTO_DC_ON interfaces are carried using HIGH INPUT signals, triode Q1 is controlled, makes its saturation conduction, circuit
In triode Q4 base stage obtain a high voltage, the circuit normal work of power unit, reduce and led from former car CD main frames
One wire is to the trouble on amplifirer.It is long and easily by caused by car the problems such as impulse disturbances to solve wire.
The above-mentioned high imported circuit for reducing sound damage, by using low-power, the resistance of small size, electric capacity, diode,
For the active high input module 10 of triode and differential amplification module composition come " height the turn low " circuit realized, former sound is impaired smaller,
High RST is transformed into low signal by differential amplification module, and former sound is impaired smaller, realizes and there was only the output of loudspeaker high-power signal
During former car CD main frames connection power amplifier, high-power loudspeaker signal can be converted into the LINE audio signals of low-power, make work(
Put that the audio of output is impaired smaller, the DC voltage that former car CD main frame loudspeaker signals carry separated by DC detecting module 20,
The switching on and shutting down of power amplifier are controlled, reduces from former car CD main frames and leads a wire to the trouble on amplifirer, solve wire and compare
It is long and easily by caused by car the problem of impulse disturbances.
It is above-mentioned that technology contents of the present utility model are only further illustrated with embodiment, in order to reader is easier to understand,
But embodiment of the present utility model is not represented is only limitted to this, any technology extension or recreation done according to the utility model,
By protection of the present utility model.The scope of protection of the utility model is defined by claims.
Claims (9)
1. the high imported circuit for reducing sound damage, it is characterised in that described including power amplifier front end units and amplifier power supply unit
Power amplifier front end units, after it receives the HIGH signals of power amplifier, HIGH signals are amplified and the partial pressure of voltage, acquisition are amplified
LINE audio signals and power initiation voltage afterwards；Amplifier power supply unit, it receives power initiation voltage and power amplifier in itself
Start shooting voltage, it is start that high voltage can drive CD main frames to have one in two voltages.
2. the imported circuit for reducing sound damage of height according to claim 1, it is characterised in that the power amplifier front end units bag
Include high input module and DC detecting module, the high input module, after the HIGH signals for receiving power amplifier, HIGH is believed
Number it is amplified, obtains LINE audio signals after amplification；The DC detecting module, after the HIGH signals for receiving power amplifier,
Partial pressure is carried out to the voltage of HIGH signals, obtains power initiation voltage.
3. the imported circuit for reducing sound damage of height according to claim 2, it is characterised in that the high input module includes
Interface, coupled capacitor C1, C2 and differential amplification module, HIGH signals are inputted from interface, inputted after coupled capacitor C1, C2
To differential amplification module, after being compared and enlarged, a LINE audio signal is exported.
4. the imported circuit for reducing sound damage of height according to claim 3, it is characterised in that two interfaces of the interface
Between be also parallel with load resistance R3.
5. the imported circuit for reducing sound damage of height according to claim 4, it is characterised in that the differential amplification module bag
Include comparator U1, resistance R4, resistance R5, resistance R6 and resistance R7, the coupled capacitor C1 and pass through resistance R4 and comparator U1
In-phase input end connection, the coupled capacitor C2 is connected by resistance R5 with comparator U1 inverting input, and resistance R7 is simultaneously
Be associated between comparator U1 output end and inverting input, resistance R6 be connected to comparator U1 in-phase input end it
Between.
6. the imported circuit for reducing sound damage of height according to claim 5, it is characterised in that the DC detecting module bag
Switching diode D4, D5 and current-limiting resistance R13 are included, switching diode D4, D5 one end are in parallel with load resistance R3, the other end
It is connected with current-limiting resistance R13, current-limiting resistance R13 one end is connected with amplifier power supply unit.
7. the imported circuit for reducing sound damage of height according to claim 6, it is characterised in that the amplifier power supply unit bag
Switching Power Supply control module is included, the Switching Power Supply control module includes the triode Q4 being connected with power supply, power initiation voltage
And the start voltage of power amplifier in itself is separately input into triode Q4 base stage, if Q4 base stage has a high voltage, power supply is just
Often work.
8. the imported circuit for reducing sound damage of height according to claim 7, it is characterised in that the Switching Power Supply controls mould
Block also includes triode Q1, and the base stage of the triode Q1 is connected with current-limiting resistance R13 one end, controlled by DC detecting module
Triode Q5 conducting and block, to drive the start of CD main frames and keep original state.
9. the imported circuit for reducing sound damage of height according to claim 8, it is characterised in that the Switching Power Supply controls mould
Block also includes triode Q7, and triode Q7 base stage is connected with current-limiting resistance R13 one end, triode Q7 colelctor electrode and three poles
Pipe Q4 base stage connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720469446.8U CN206835344U (en) | 2017-04-28 | 2017-04-28 | The high imported circuit for reducing sound damage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720469446.8U CN206835344U (en) | 2017-04-28 | 2017-04-28 | The high imported circuit for reducing sound damage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206835344U true CN206835344U (en) | 2018-01-02 |
Family
ID=60769097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720469446.8U Active CN206835344U (en) | 2017-04-28 | 2017-04-28 | The high imported circuit for reducing sound damage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206835344U (en) |
-
2017
- 2017-04-28 CN CN201720469446.8U patent/CN206835344U/en active Active
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