CN207766231U - Low distortion clipping device, switch type audio power amplifier - Google Patents
Low distortion clipping device, switch type audio power amplifier Download PDFInfo
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- CN207766231U CN207766231U CN201721778413.8U CN201721778413U CN207766231U CN 207766231 U CN207766231 U CN 207766231U CN 201721778413 U CN201721778413 U CN 201721778413U CN 207766231 U CN207766231 U CN 207766231U
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Abstract
The utility model is related to a kind of low distortion clipping device, including clipping circuit, buffer circuit and see-saw circuit, clipping circuit includes first switch diode and second switch diode；Buffer circuit connects see-saw circuit, and the cathode of first switch diode connects buffer circuit, and the anode of second switch diode connects see-saw circuit, and the anode of first switch diode connects external audio circuitry with the cathode of second switch diode.A kind of switch type audio power amplifier, including above-mentioned low distortion clipping device and switch type audio power amplifying circuit.Above-mentioned low distortion clipping device, switch type audio power amplifier, since the switching diode of use has extremely low leakage current, therefore reference voltage is distorted very little to the insertion of audio signal, by above-mentioned low distortion clipping circuit, traditional clipping circuit can be efficiently solved and will produce the problem of larger insertion is distorted when carrying out amplitude limiting processing to audio signal.
Description
Technical field
The utility model is related to audio-frequency power amplifier fields, more particularly to a kind of low distortion clipping device, switching regulator
Audio-frequency power amplifier.
Background technology
With the rapid development of various portable electronic devices, the application of audio-frequency power amplifier is also more and more extensive, low
Distortion, high efficiency are always the target that audio-frequency power amplifier is constantly pursued.Existing audio-frequency power amplifier output waveform exists
Top or bottom are susceptible to interference, in order to eliminate these interference, need to carry out amplitude limiting processing to the peak value of output waveform.
Then clipping circuit is parallel to audio by traditional clipping circuit using two isobaric Zener diode differential concatenations
In circuit, when input signal peak value is more than the voltage value of clipping circuit work, output signal is limited in no more than slicing electricity
The voltage value on road, when input audio signal peak value is less than or equal to the voltage limit of clipping circuit, the clipping circuit is to input
Audio signal generate larger insertion distortion.Therefore, traditional clipping circuit meeting when carrying out amplitude limiting processing to audio signal
Generate larger insertion distortion.
Utility model content
Based on this, it is necessary to will produce the problem of larger insertion is distorted for traditional clipping circuit, provide a kind of low mistake
True clipping device, switch type audio power amplifier.
A kind of low distortion clipping device, described device include clipping circuit, buffer circuit and see-saw circuit, described to cut
Wave circuit includes first switch diode and second switch diode；The buffer circuit connects the see-saw circuit, institute
The cathode for stating first switch diode connects the buffer circuit, and the anode of the second switch diode connects the reverse phase and puts
The cathode of big circuit, the anode of the first switch diode and the second switch diode connects external audio electricity jointly
Road.
In one embodiment, the buffer circuit include the first operational amplifier, first operational amplifier it is anti-
Phase input terminal is connect with the output end of first operational amplifier and the common end connection see-saw circuit, and described first
The output end of operational amplifier connects the cathode of the first switch diode, the in-phase input end of first operational amplifier
Access adjustable reference voltage.
In one embodiment, the see-saw circuit includes second operational amplifier, first resistor component and second
Resistor assembly, the first resistor component and the second resistance component are connected and common end connects the second operational amplifier
Inverting input, the first resistor component other end connects the buffer circuit, and the second resistance component other end connects
Connect the output end of the second operational amplifier, the in-phase input end ground connection of the second operational amplifier, second operation
The output end of amplifier connects the anode of the second switch diode.
In one embodiment, the first resistor component includes first resistor, the first resistor connection described second
Resistor assembly and common end connect the inverting input of the second operational amplifier, described in the first resistor other end connection
Buffer circuit.
In one embodiment, the second resistance component includes second resistance, the second resistance and first electricity
Resistance series connection and common end connect the inverting input of the second operational amplifier, the second resistance other end connection described the
The output end of two operational amplifiers.
In one embodiment, the first resistor and the second resistance are the resistance that resistance value is equal.
A kind of switch type audio power amplifier, including described in switch type audio power amplifying circuit and above-mentioned any one
Low distortion clipping device, the low distortion clipping device accesses the switch type audio power amplifying circuit.
Above-mentioned low distortion clipping device, switch type audio power amplifier are more than reference in the input voltage of audio signal
When voltage, first switch diode current flow can carry out slicing processing, in the defeated of audio signal to the input voltage of audio signal
When entering voltage less than reference voltage, the cut-off of first switch diode, the output voltage of audio signal and the input of audio signal are electric
It presses equal in magnitude.Since the switching diode of use has extremely low leakage current, insertion of the reference voltage to audio signal
It is distorted very little.By above-mentioned low distortion clipping circuit, traditional clipping circuit can be efficiently solved and carried out to audio signal
The problem of will produce larger insertion distortion when amplitude limiting processing.
Description of the drawings
Fig. 1 is one embodiment circuit diagram of low distortion clipping device；
Fig. 2 is one embodiment circuit diagram of low distortion clipping device；
Specific implementation mode
The utility model is more fully retouched below with reference to relevant drawings for the ease of understanding the utility model,
It states.The preferred embodiment of the utility model is given in attached drawing.But the utility model can come in many different forms
It realizes, however it is not limited to embodiment described herein.Make to the utility model on the contrary, purpose of providing these embodiments is
The understanding of disclosure is more thorough and comprehensive.
Referring to Fig. 1, a kind of low distortion clipping device, including clipping circuit 100, buffer circuit 200 and reverse phase amplification electricity
Road 300, clipping circuit 100 include first switch diode D1 and second switch diode D2；Buffer circuit 200 connects reverse phase and puts
The cathode of big circuit 300, first switch diode D1 connects buffer circuit 200, and the anode connection of second switch diode D2 is anti-
Phase amplifying circuit 300, the anode of first switch diode D1 and the cathode of second switch diode D2 connect external audio jointly
Circuit.
Specifically, the audio input end of external audio circuitry is close to first switch diode D1, audio input signal is first
First switch diode D1 is flowed through, when the input voltage of external audio signal is more than the output voltage of buffer circuit 200, first
Switching diode D1 conductings, realize and handle the clipping of the input voltage of audio signal, when the input of external audio signal
When voltage is less than the output voltage of buffer circuit 200, the D1 cut-offs of first switch diode, the input voltage and audio of audio signal
The output voltage of signal is equal in magnitude.Since the switching diode of use has extremely low leakage current, buffer circuit 200
Output voltage is distorted very little to the insertion of audio signal.
In one embodiment, referring to Fig. 2, buffer circuit 200 includes the first operational amplifier K1, the first operation amplifier
The inverting input of device K1 is connect with the output end of the first operational amplifier K1 and common end connection see-saw circuit 300, the
The cathode of the output end connection first switch diode D1 of one operational amplifier K1, the in-phase input end of the first operational amplifier K1
Access adjustable reference voltage.
Specifically, the inverting input of the first operational amplifier K1 and output end short circuit form high impedance and input Low ESR
The operating mode of output, output voltage are equal with homophase input voltage.Homophase input voltage is adjustable voltage, then can be according to reality
Border situation adjusts the disconnected voltage of homophase input in different voicefrequency circuits, to realize at the clipping to different voicefrequency circuits
Reason has the convenience operated by force very much.
In one embodiment, please continue to refer to Fig. 2, see-saw circuit 300 includes second operational amplifier K2, first
Resistor assembly 310 and second resistance component 320, first resistor component 310 and second resistance component 320 are connected and common end connects
The inverting input of second operational amplifier K2,310 other end of first resistor component connect buffer circuit 100, second resistance group
320 other end of part connects the output end of second operational amplifier K2, and the in-phase input end of second operational amplifier K2 is grounded, and second
The anode of the output end connection second switch diode D2 of operational amplifier K2.
Specifically, first resistor component 310 and second resistance component 320 can be multiple resistance serial or parallel connections respectively
Mode forms, and herein, resistance building form and number in first resistor component 310 and second resistance component 320 can be with
It differs.
In one embodiment, please continue to refer to Fig. 2, first resistor component 310 includes first resistor R1, first resistor R1
Connect the inverting input of second resistance component 320 and common end connection second operational amplifier K2, the first resistor R1 other ends
Connect buffer circuit 200.Carry out substitutional resistance component 310 using first resistor R1, realizes function identical with resistor assembly 310.
Identical function is realized with minimum device, has saved cost.
In one embodiment, please continue to refer to Fig. 2, second resistance component 320 includes first resistor R2, second resistance R2
The inverting input of second operational amplifier K2, the connection of the second resistance R2 other ends are connected with first resistor R1 series connection and common end
The output end of second operational amplifier K2.Carry out substitutional resistance component 320 using second resistance R2, realizes and 320 phase of resistor assembly
Same function.Identical function is realized with minimum device, has saved cost.
In one embodiment, it is the equal resistance of resistance value please continue to refer to Fig. 2, first resistor R1 and second resistance R2.
The resistance value of first resistor R1 and second resistance R2 are equal, have input impedance height, the low feature of output impedance, input impedance high energy
Reducing the influence to input circuit, output impedance low energy increases carrying load ability, even if subsequent conditioning circuit input impedance is smaller, amplification
Device output is remained to remain unchanged or is basically unchanged.
Above-mentioned low distortion clipping device, when the input voltage of external audio signal is more than reference voltage, first switch two
Pole pipe is connected, and slicing processing can be carried out to the input voltage of external audio signal, small in the input voltage of external audio signal
When reference voltage, the input of the cut-off of first switch diode, the output voltage and external audio signal of external audio signal is electric
It presses equal in magnitude.Since the switching diode of use has extremely low leakage current, reference voltage is to external audio signal
Traditional clipping circuit can be efficiently solved to audio signal by above-mentioned low distortion clipping circuit by being inserted into distortion very little
The problem of carrying out will produce larger insertion distortion when amplitude limiting processing.
A kind of switch type audio power amplifier, referring to Fig. 2, including switch type audio power amplifying circuit 400 and upper
State low distortion clipping device, low distortion clipping device connecting valve formula audio power amplifying circuit 400.
Specifically, switch type audio power amplifying circuit 400 connects the clipping circuit 100 of low distortion clipping device, switch
Formula audio power amplifying circuit 400 is provided with audio input end and audio output, by switch type audio power amplifying circuit 400
Audio input end incoming audio signal and export to clipping circuit 100, receive the audio signal that clipping circuit 100 exports and by
Audio output exports.The buffer module 200 of low distortion clipping device accesses an adjustable reference voltage, when Audio power amplifier electricity
When the voltage for the audio signal that road 400 is sent is more than adjustable reference voltage, the D1 conductings of first switch diode can be to switching regulator
The input voltage of 400 audio signal of audio power amplifying circuit carries out slicing processing, is sent when audio power amplifying circuit 400
When the voltage of audio signal is less than reference voltage, the D1 cut-offs of first switch diode, the audio letter of audio power amplifying circuit 400
Number output voltage and the input voltage of the audio signal of audio power amplifying circuit 400 it is equal in magnitude, due to the switch of use
Diode has extremely low leakage current, therefore reference voltage is distorted very little to the insertion of audio signal, and insertion distortion at this time is small
In 0.01%.
Above-mentioned switch type audio power amplifier is big in the input voltage of switch type audio power amplifying circuit audio signal
When reference voltage, first switch diode current flow can be to the input electricity of switching regulator audio power amplifying circuit audio signal
Pressure carries out slicing processing, when the input voltage of switch type audio power amplifying circuit audio signal is less than reference voltage, first
Switching diode ends, input voltage and the switch type audio power amplification electricity of switch type audio power amplifying circuit audio signal
The output voltage of road audio signal is equal in magnitude.Since the switching diode of use has extremely low leakage current, with reference to electricity
It presses the insertion to the audio signal of switching regulator audio power amplifying circuit to be distorted very little, passes through above-mentioned low distortion clipping circuit, energy
It enough efficiently solves traditional clipping circuit and will produce asking for larger insertion distortion when carrying out amplitude limiting processing to audio signal
Topic.
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But therefore it can not be interpreted as the limitation to utility model patent range.It should be pointed out that for the common skill of this field
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (7)
1. a kind of low distortion clipping device, which is characterized in that described device includes clipping circuit, buffer circuit and reverse phase amplification electricity
Road, the clipping circuit include first switch diode and second switch diode；The buffer circuit connects the reverse phase and puts
The cathode of big circuit, the first switch diode connects the buffer circuit, the anode connection of the second switch diode
The see-saw circuit, the anode of the first switch diode and the cathode of the second switch diode connect external sound
Frequency circuit.
2. low distortion clipping device according to claim 1, which is characterized in that the buffer circuit is put including the first operation
Big device, the inverting input of first operational amplifier is connect with the output end of first operational amplifier and common end connects
The see-saw circuit is connect, the output end of first operational amplifier connects the cathode of the first switch diode, institute
State the in-phase input end access adjustable reference voltage of the first operational amplifier.
3. low distortion clipping device according to claim 1, which is characterized in that the see-saw circuit includes the second fortune
Calculate amplifier, first resistor component and second resistance component, the first resistor component and second resistance component series connection and
Common end connects the inverting input of the second operational amplifier, and the first resistor component other end connects the buffering electricity
Road, the second resistance component other end connect the output end of the second operational amplifier, the second operational amplifier
In-phase input end is grounded, and the output end of the second operational amplifier connects the anode of the second switch diode.
4. low distortion clipping device according to claim 3, which is characterized in that the first resistor component includes the first electricity
Resistance, the first resistor connects the second resistance component and common end connects the anti-phase input of the second operational amplifier
End, the first resistor other end connect the buffer circuit.
5. low distortion clipping device according to claim 4, which is characterized in that the second resistance component includes the second electricity
Resistance, the second resistance is connected with the first resistor and common end connects the inverting input of the second operational amplifier,
The second resistance other end connects the output end of the second operational amplifier.
6. low distortion clipping device according to claim 5, which is characterized in that the first resistor and the second resistance
For the equal resistance of resistance value.
7. a kind of switch type audio power amplifier, which is characterized in that wanted including switch type audio power amplifying circuit and right
The low distortion clipping device described in 1-6 any one, the low distortion clipping device is asked to connect the switch type audio power and put
Big circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721778413.8U CN207766231U (en) | 2017-12-18 | 2017-12-18 | Low distortion clipping device, switch type audio power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721778413.8U CN207766231U (en) | 2017-12-18 | 2017-12-18 | Low distortion clipping device, switch type audio power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207766231U true CN207766231U (en) | 2018-08-24 |
Family
ID=63187724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721778413.8U Active CN207766231U (en) | 2017-12-18 | 2017-12-18 | Low distortion clipping device, switch type audio power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207766231U (en) |
-
2017
- 2017-12-18 CN CN201721778413.8U patent/CN207766231U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder |
Address after: Room 401, Block D, Huahan Innovation Park, 16 Longshan Road, North District, Xili Street, Nanshan District, Shenzhen City, Guangdong Province, 518000 Patentee after: Shenzhen East micro smart Polytron Technologies Inc Address before: 518051 floor 2, block C, office building, Hanchuang new garden, 16 Langshan Road, Nanshan District, Shenzhen, Guangdong, 2 Patentee before: Shenzhen East micro smart Polytron Technologies Inc |
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| CP02 | Change in the address of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: 518000 R & D building 1601, block a, building 7, Wanke Yuncheng phase I, Xili community, Xili street, Nanshan District, Shenzhen City, Guangdong Province (16 / F, block a, building 1, international innovation Valley) Patentee after: SHENZHEN TENDZONE INTELLIGENT TECHNOLOGY Co.,Ltd. Address before: Room 401, Block D, Huahan Innovation Park, 16 Longshan Road, North District, Xili Street, Nanshan District, Shenzhen City, Guangdong Province, 518000 Patentee before: SHENZHEN TENDZONE INTELLIGENT TECHNOLOGY Co.,Ltd. |
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| CP02 | Change in the address of a patent holder |