CN206743199U - A kind of high power audio-frequency power amplifier - Google Patents
A kind of high power audio-frequency power amplifier Download PDFInfo
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- CN206743199U CN206743199U CN201720206491.4U CN201720206491U CN206743199U CN 206743199 U CN206743199 U CN 206743199U CN 201720206491 U CN201720206491 U CN 201720206491U CN 206743199 U CN206743199 U CN 206743199U
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Abstract
The utility model discloses a kind of high power audio-frequency power amplifier of audio-frequency power amplifier technical field,Including circuit for generating triangular wave,The output end of the circuit for generating triangular wave is electrically connected with the input of comparator,Utilize pre-amplification circuit input audio signal,And amplified,The input of triangular signal and the comparator of audio signal input pulsewidth modulation,Comparator is processed to the various signals of input,Its sensitivity is set to match,The output signal shaping of comparator is transformed into the output drive signal of mutual symmetry by drive circuit,A pair of reverse modulated square waves for being obtained itself by switch power output circuit are transformed into the amplification frequency modulation on pulse of conducting,Signal conversion circuit converts a signal into Single-end output,Amplifier A3 output end is set to obtain triangular wave again,Finally signal is handled and exported using filter circuit,This scheme reduces the distortion of audio-frequency power amplifier,Increase antijamming capability.
Description
Technical field
Audio-frequency power amplifier technical field is the utility model is related to, specially a kind of high power audio-frequency power amplifier.
Background technology
Audio-frequency power amplifier is a kind of conventional power amplifier, and its circuit structure form is numerous, audio gauge power
The performance indications of amplifier mainly have fidelity, reliability, stability, electrical loss, efficiency and cost performance etc..It is anti-using voltage negative
The audio-frequency power amplifier of feedback mode is a kind of relatively conventional audio-frequency power amplifier, but there is also some shortcomings, such as hold
It is also easy to produce transient intermodulation etc..In existing audio-frequency power amplifier, the tonequality of pure class-A audio power amplifier is most
Alright, but the power consumption of pure class-A audio power amplifier is big, cost is high.And the first and second genus audio power amplifiers are between Class A
Between Class B audio-frequency power amplifier, there are some quiescent currents, tonequality is preferable, has intermodulation distortion, and its is most widely used,
Also super class-A audio power amplifier, its circuit structure is complicated, and effect is unsatisfactory, therefore, I proposes a kind of high power tones
Frequency power amplifier.
Utility model content
The purpose of this utility model is to provide a kind of high power audio-frequency power amplifier, to solve in above-mentioned background technology
There is distortion in the existing audio-frequency power amplifier proposed, be disturbed the problem of big.
To achieve the above object, the utility model provides following technical scheme：A kind of high power audio-frequency power amplifier, bag
Circuit for generating triangular wave is included, the output end of the circuit for generating triangular wave is electrically connected with the input of comparator, the comparator
Input be electrically connected with the output end of pre-amplification circuit, the output end of the comparator is electrically connected with the input of drive circuit
End, the output end of the drive circuit are electrically connected with the input of switch power output circuit, the switch power output circuit
Output end be electrically connected with the input of load, the output end of the load is electrically connected with the input of signal conversion circuit, institute
The output end for stating signal conversion circuit is electrically connected with the input of filter circuit.
Preferably, the circuit for generating triangular wave includes amplifier A1, the amplifier A1 anti-phase input port ground connection, described
Amplifier A1 homophase input port is simultaneously connected to resistance R1 and R2, and the other end of the resistance R1 is simultaneously connected to diac
DZ, resistance R3 and R4, the diac DZOther end ground connection, the other end concatenation amplifier A1's of the resistance R3
Output port, the other end of the resistance R4 are simultaneously connected to diode D1 positive pole and diode D2 negative pole, the diode D2
Positive pole and diode D1 negative pole between be provided with variable resistor RW, the variable resistor RWControl terminal and be connected to amplifier A2's
The other end of anti-phase input port, output port and resistance R2, the homophase input port of the amplifier A2 are serially connected with resistance R5, institute
State resistance R5 other end ground connection.
Preferably, the signal conversion circuit includes access A ports, and the access A ports are simultaneously connected to resistance R6 and R8, institute
State the resistance R6 other end and be connected to access B ports and resistance R7, the other end of the resistance R7 be simultaneously connected to the anti-phase of amplifier A3
Input port and resistance R10, the resistance R10 other end concatenation amplifier A3 output C-terminal mouth, the other end of the resistance R8
And resistance R9 and amplifier A3 homophase input port are connected to, the other end ground connection of the resistance R9.
Preferably, the comparator is LM339 types or LM393 type comparators.
Compared with prior art, the beneficial effects of the utility model are：It is LM339 types or LM393 types ratio by comparator
Compared with device, its switch speed is fast, and time delay is small, using the output between the resistance R3 and R4 in circuit for generating triangular wave, is transporting
Put A2 output port input voltage signal, regulation variable resistor RW, utilize diode D1, D2, amplifier A1 and two-way breakdown two
Pole pipe DZ, can obtain one it is linear very well and frequency stabilization triangular wave, using pre-amplification circuit input audio signal,
And amplified, the input of the comparator of triangular signal and audio signal input pulsewidth modulation, comparator is to input
Various signals are processed, and its sensitivity is matched, and the output signal shaping of comparator is transformed into mutually by drive circuit
Symmetrical output drive signal is mended, and a pair of reverse modulated square waves for itself being obtained by switch power output circuit are transformed into
The amplification frequency modulation on pulse of conducting, signal conversion circuit convert a signal into Single-end output, amplifier A3 output end is obtained again
Triangular wave, finally signal is handled and exported using filter circuit, this scheme reduces the distortion of audio-frequency power amplifier,
Increase antijamming capability.
Brief description of the drawings
Fig. 1 is the utility model principle block diagram；
Fig. 2 is the utility model circuit for generating triangular wave figure；
Fig. 3 is the utility model signal conversion circuit figure.
In figure：1 circuit for generating triangular wave, 2 pre-amplification circuits, 3 comparators, 4 drive circuits, 5 switch powers output electricity
Road, 6 loads, 7 signal conversion circuits, 8 filter circuits.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
Fig. 1-3 are referred to, the utility model provides a kind of technical scheme：A kind of high power audio-frequency power amplifier, including
Circuit for generating triangular wave 1, the output end of the circuit for generating triangular wave 1 are electrically connected with the input of comparator 3, the comparator
3 input is electrically connected with the output end of pre-amplification circuit 2, and the output end of the comparator 3 is electrically connected with drive circuit 4
Input, the output end of the drive circuit 4 are electrically connected with the input of switch power output circuit 5, and the switch power is defeated
The output end for going out circuit 5 is electrically connected with the input of load 6, and the output end of the load 6 is electrically connected with signal conversion circuit 7
Input, the output end of the signal conversion circuit 7 are electrically connected with the input of filter circuit 8.
Wherein, the circuit for generating triangular wave 1 includes amplifier A1, the amplifier A1 anti-phase input port ground connection, described
Amplifier A1 homophase input port is simultaneously connected to resistance R1 and R2, and the other end of the resistance R1 is simultaneously connected to diac
DZ, resistance R3 and R4, the diac DZOther end ground connection, the other end concatenation amplifier A1's of the resistance R3
Output port, the other end of the resistance R4 are simultaneously connected to diode D1 positive pole and diode D2 negative pole, the diode D2
Positive pole and diode D1 negative pole between be provided with variable resistor RW, the variable resistor RWControl terminal and be connected to amplifier A2's
The other end of anti-phase input port, output port and resistance R2, the homophase input port of the amplifier A2 are serially connected with resistance R5, institute
Resistance R5 other end ground connection is stated, the signal conversion circuit 7 includes access A ports, and the access A ports are simultaneously connected to resistance R6
And R8, the other end of the resistance R6 and be connected to access B ports and resistance R7, the other end of the resistance R7 be simultaneously connected to amplifier A3
Anti-phase input port and resistance R10, the resistance R10 other end concatenation amplifier A3 output C-terminal mouth, the resistance R8's
The other end and the homophase input port for being connected to resistance R9 and amplifier A3, the other end ground connection of the resistance R9, the comparator 3 are
LM339 types or LM393 type comparators, its switch speed is fast, and time delay is small.
Operation principle：Using the output between the resistance R3 and R4 in circuit for generating triangular wave 1, in amplifier A2 output end
Mouth input voltage signal, regulation variable resistor RW, utilize diode D1, D2, amplifier A1 and diac DZ, can obtain
To linear fine and frequency stabilization a triangular wave, using the input audio signal of pre-amplification circuit 2, and amplified,
The input of triangular signal and the comparator 3 of audio signal input pulsewidth modulation, comparator 3 enter to the various signals of input
Row working process, its sensitivity is set to match, the output signal shaping of comparator 3 is transformed into mutual symmetry by drive circuit 4
Output drive signal, a pair of reverse modulated square waves for being obtained itself by switch power output circuit 5 are transformed into conducting
Amplify frequency modulation on pulse, signal conversion circuit 7 converts a signal into Single-end output, amplifier A3 output end is obtained triangle again
Ripple, finally signal is handled and exported using filter circuit 8.
While there has been shown and described that embodiment of the present utility model, for the ordinary skill in the art,
It is appreciated that these embodiments can be carried out with a variety of changes in the case where not departing from principle of the present utility model and spirit, repaiied
Change, replace and modification, the scope of the utility model are defined by the appended claims and the equivalents thereof.
Claims (2)
1. a kind of high power audio-frequency power amplifier, including circuit for generating triangular wave (1), it is characterised in that：The triangular wave production
The output end of raw circuit (1) is electrically connected with the input of comparator (3), and the input electric connection of the comparator (3) is preposition
The output end of amplifying circuit (2), the output end of the comparator (3) are electrically connected with the input of drive circuit (4), the driving
The output end of circuit (4) is electrically connected with the input of switch power output circuit (5), the switch power output circuit (5)
Output end is electrically connected with the input of load (6), and the output end of the load (6) is electrically connected with the defeated of signal conversion circuit (7)
Enter end, the output end of the signal conversion circuit (7) is electrically connected with the input of filter circuit (8)；The triangular wave produces electricity
The anti-phase input port that road (1) includes amplifier A1, the amplifier A1 is grounded, and the homophase input port of the amplifier A1 is simultaneously connected to electricity
R1 and R2 is hindered, the other end of the resistance R1 is simultaneously connected to diac DZ, resistance R3 and R4, the two-way pole of breakdown two
Pipe DZOther end ground connection, the other end concatenation amplifier A1 of resistance R3 output port, the other end of the resistance R4 is simultaneously
Diode D1 positive pole and diode D2 negative pole are connected to, is provided between the positive pole of the diode D2 and diode D1 negative pole
Variable resistor RW, the variable resistor RWControl terminal and be connected to amplifier A2 anti-phase input port, output port and resistance R2
The other end, the homophase input port of the amplifier A2 are serially connected with resistance R5, the resistance R5 other end ground connection；The signal becomes
Changing circuit (7) includes access A ports, and the access A ports are simultaneously connected to resistance R6 and R8, and the other end of the resistance R6 is simultaneously connected to
Access B ports and resistance R7, the other end of the resistance R7 and anti-phase input port and the resistance R10 for being connected to amplifier A3 are described
Resistance R10 other end concatenation amplifier A3 output C-terminal mouth, the other end of the resistance R8 are simultaneously connected to resistance R9's and amplifier A3
Homophase input port, the other end ground connection of the resistance R9.
A kind of 2. high power audio-frequency power amplifier according to claim 1, it is characterised in that：The comparator (3) is
LM339 types or LM393 type comparators.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720206491.4U CN206743199U (en) | 2017-03-06 | 2017-03-06 | A kind of high power audio-frequency power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720206491.4U CN206743199U (en) | 2017-03-06 | 2017-03-06 | A kind of high power audio-frequency power amplifier |
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| CN206743199U true CN206743199U (en) | 2017-12-12 |
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ID=60557071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201720206491.4U Active CN206743199U (en) | 2017-03-06 | 2017-03-06 | A kind of high power audio-frequency power amplifier |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112630525A (en) * | 2020-11-30 | 2021-04-09 | 国网重庆市电力公司营销服务中心 | Power measurement method and device, PCB circuit structure and storage medium |
| CN113016138A (en) * | 2018-10-14 | 2021-06-22 | 思睿逻辑国际半导体有限公司 | PWM modulator having chopped triangular wave PWM quantizer and quantizer with controllable analog gain and multiple non-ideal gains whose influence characteristics can be calibrated |
-
2017
- 2017-03-06 CN CN201720206491.4U patent/CN206743199U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113016138A (en) * | 2018-10-14 | 2021-06-22 | 思睿逻辑国际半导体有限公司 | PWM modulator having chopped triangular wave PWM quantizer and quantizer with controllable analog gain and multiple non-ideal gains whose influence characteristics can be calibrated |
| US11296685B2 (en) | 2018-10-14 | 2022-04-05 | Cirrus Logic, Inc. | PWM modulator having quantizer calibratable for multi-non-ideal gain-affecting characteristics |
| CN113016138B (en) * | 2018-10-14 | 2022-07-15 | 思睿逻辑国际半导体有限公司 | PWM modulator having chopped triangular wave PWM quantizer and quantizer with controllable analog gain and multiple non-ideal gains whose influence characteristics can be calibrated |
| CN112630525A (en) * | 2020-11-30 | 2021-04-09 | 国网重庆市电力公司营销服务中心 | Power measurement method and device, PCB circuit structure and storage medium |
| CN112630525B (en) * | 2020-11-30 | 2024-01-30 | 国网重庆市电力公司营销服务中心 | Power measurement method and device, PCB circuit structure and storage medium |
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