CN201781459U - Distortion-prevention class-D audio power amplifier - Google Patents
Distortion-prevention class-D audio power amplifier Download PDFInfo
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- CN201781459U CN201781459U CN2010202497020U CN201020249702U CN201781459U CN 201781459 U CN201781459 U CN 201781459U CN 2010202497020 U CN2010202497020 U CN 2010202497020U CN 201020249702 U CN201020249702 U CN 201020249702U CN 201781459 U CN201781459 U CN 201781459U
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- distorsion
- operational amplifier
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Abstract
The utility model discloses a distortion-prevention class-D audio power amplifier, which includes a preamplifier for adjusting input audio signals, an integrating amplifier for amplifying the audio signals output by the preamplifier, and a comparator for carrying out PWM (pulse width modulation) on the audio signals output by the integrating amplifier, wherein a modulating signal inputting terminal of the integrating amplifier is connected with a PWM carrier signal source. The class-D audio power amplifier further includes a distortion judging circuit for making judgments according to output results of the comparator and obtaining distortion signals of the audio signals, a distortion-prevention switching control circuit controlling the on/off of a distortion-prevention switch according to the distortion signals output by the distortion judging circuit, and an H-bridge circuit outputting pulse drive signals to an external speaker according to the output results of the comparator, wherein two ends of the distortion-prevention switch are connected two input terminal of the integrating amplifier. When distorted sound appears, the distortion judgment circuit and the distortion-prevention switching control circuit are utilized to control the on/off of the distortion-prevention switch, thereby reducing audio signals until the distorted sound does not appear again.
Description
Technical field
The utility model belongs to the audio frequency power amplifier field, relates in particular to a kind of D genus audio power amplifier of anti-distorsion.
Background technology
D class audio frequency power amplifier is a kind of production burst sequence and drives the amplifier of load by pulse train that the pulse duration of pulse train is modulated according to input signal.The power device of D class audio frequency power amplifier always works on off state, and its efficient can reach 100% in theory.This high efficiency not only means energy-conservation, and is representing and lacking heat, for input to heat radiation is removed or reduced to a lot of products from.
The efficient height of D genus audio power amplifier, tonequality is good, can provide up to the efficient more than 90% under the situation than low distortion, is widely used in portable type electronic products such as mobile phone, MP3.
The D genus audio power amplifier in the course of the work; through regular meeting signal amplitude occurs and exceeds the triangular wave amplitude owing to input signal is excessive when; at this moment; the part that signal exceeds; do not sampled, so the output signal of this moment is through producing the serious top distortion of cutting after the loud speaker filtering by triangular wave.Show acoustically, will in the music signal of playing, follow significantly noisy noise, have a strong impact on hearing enjoying.And because this moment, power amplifier was operated under the very big power output, output current is also very big, power amplifier and loud speaker is all had certain harm, even can burn power amplifier or loud speaker.
The technology of traditional anti-distorsion that is used for the D genus audio power amplifier is to regulate gain by the feedback resistance that changes preamplifier, but the method for this adjusting, can produce the sudden change of gain, thereby can produce the sound sudden change in the mutation process, influence the normal play of music.
The utility model content
The technical problem that the utility model solves is that existing anti-distorsion technology can produce the problem of gain sudden change.
For solving the problems of the technologies described above, the utility model provides following technical scheme:
The D genus audio power amplifier of a kind of anti-distorsion that the utility model relates to is characterized in that, comprising: to the preamplifier adjusted of audio signal of input; The audio signal of described preamplifier output is carried out the integral amplifier of processing and amplifying, be electrically connected with described preamplifier; Audio signal to described integral amplifier output is carried out the comparator that pulse-width modulation is handled, and its audio signal input end is electrically connected with the output of described integral amplifier, and the modulation signal input then is connected to a pulse width modulation carrier signal source; To the distorsion decision circuitry that the output result according to described comparator judges, obtain the distorsion signal of audio signal; According to the anti-distorsion ON-OFF control circuit of the controlled anti-distorsion switch on and off of distorsion signal of distorsion decision circuitry output, the two ends of described anti-distorsion switch connect two inputs of integral amplifier respectively; Export the H-bridge circuit of pulse drive signal to external loudspeaker according to the output result control of described comparator.
Preferably, distorsion decision circuitry comprises first trigger, second trigger and NOR gate; The first input end of described first trigger and the first input end of second trigger are connected the output of comparator respectively, second input of first trigger all is connected with clock signal with second input of second trigger, and the output of the output of first trigger and second trigger is connected two inputs of NOR gate respectively.
Preferably, anti-distorsion ON-OFF control circuit comprises inverter, first switching tube, second switch pipe, the 3rd electric capacity, the 5th comparator, the 6th comparator and NAND gate; The input of described inverter connects the output of distorsion decision circuitry and the control end of second switch pipe, the output of inverter connects first output end of switching tube, one end of first switching tube connects reference voltage, the other end of first switching tube connects an end of second switch pipe and an end of the 3rd electric capacity, the other end of the other end of second switch pipe and the 3rd electric capacity is connected with ground, the node of first switching tube and the 3rd electric capacity is connected the inverting input of the 5th comparator and the inverting input of the 6th comparator, the in-phase input end of the 5th comparator is connected with the first pulse width modulation carrier signal source, the in-phase input end of the 6th comparator is connected with the second pulse width modulation carrier signal source, and the output of the output of the 5th comparator and the 6th comparator is connected two inputs of NAND gate respectively; The output of NAND gate is connected with the control end of anti-distorsion switch.
Preferably, after the D genus audio power amplifier of anti-distorsion comprises that also the pulse drive signal that described H-bridge circuit is exported carries out filtering, export the low pass filter of external loudspeaker to.
Preferably, the D genus audio power amplifier of anti-distorsion also comprises the feedback resistance between the input of the output that is connected described H-bridge circuit and described operational amplifier, formation closed-loop structure.
Preferably, preamplifier comprises: to first operational amplifier handled of audio signal of input; Be connected first resistance between the in-phase input end of the reversed-phase output of described first operational amplifier and described first operational amplifier; Be connected second resistance between the inverting input of the in-phase output end of described first operational amplifier and described first operational amplifier.
Preferably, integral amplifier comprises: second operational amplifier that the audio signal of described preamplifier output is handled; Be connected first electric capacity between the in-phase input end of the reversed-phase output of described second operational amplifier and described second operational amplifier; Be connected second electric capacity between the inverting input of the in-phase output end of described second operational amplifier and described second operational amplifier.
Preferably, first operational amplifier or described second operational amplifier are the fully differential operational amplifier.
Preferably, comparator comprises first comparator and second comparator; The in-phase input end of described first comparator is connected with the reversed-phase output of described second operational amplifier; The in-phase input end of described second comparator is connected with the in-phase output end of described second operational amplifier, and the inverting input of the inverting input of described first comparator and described second comparator all is connected with described pulse width modulation carrier signal source.
Compared with prior art the utlity model has following beneficial effect: the D genus audio power amplifier of a kind of anti-distorsion that the utility model embodiment provides, when distorsion occurs, utilize distorsion decision circuitry and anti-distorsion ON-OFF control circuit to control the break-make of anti-distorsion switch, and then audio signal is reduced to make it not distorsion.
Description of drawings
Fig. 1 is the schematic block circuit diagram of the D genus audio power amplifier of a kind of anti-distorsion of the utility model first embodiment;
Fig. 2 is the distorsion decision circuitry structure chart of the D genus audio power amplifier of a kind of anti-distorsion of the utility model embodiment;
Fig. 3 is the anti-distorsion switch control structure figure of the D genus audio power amplifier of a kind of anti-distorsion of the utility model embodiment;
Fig. 4 is the schematic block circuit diagram of the D genus audio power amplifier of a kind of anti-distorsion of the utility model second embodiment;
Fig. 5 is the structure chart of comparator of the D genus audio power amplifier of a kind of anti-distorsion of the utility model embodiment;
Fig. 6 is the input and output oscillogram of comparator of the D genus audio power amplifier of a kind of anti-distorsion of the utility model embodiment;
Fig. 7 is the input and output oscillogram of distorsion decision circuitry of the D genus audio power amplifier of a kind of anti-distorsion of the utility model embodiment;
Fig. 8 is each node oscillogram of anti-distorsion ON-OFF control circuit of the D genus audio power amplifier of a kind of anti-distorsion of the utility model embodiment;
Fig. 9 is the contrast oscillogram before and after the anti-distorsion switch of the D genus audio power amplifier of a kind of anti-distorsion of the utility model embodiment is controlled.
Embodiment
Clearer for technical problem, technical scheme and beneficial effect that the utility model is solved, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Fig. 1 is the schematic block circuit diagram of the D genus audio power amplifier of a kind of anti-distorsion of the utility model first embodiment; A kind of D genus audio power amplifier of anti-distorsion comprises: to the preamplifier 21 adjusted of audio signal of input; The audio signal of described preamplifier output is carried out the integral amplifier 22 of processing and amplifying, be electrically connected with described preamplifier 21; Audio signal to described integral amplifier 22 outputs is carried out the comparator 23 that pulse-width modulation is handled, and its audio signal input end is electrically connected with the output of described integral amplifier 22, and the modulation signal input then is connected to a pulse width modulation carrier signal source 26; To the distorsion decision circuitry 27 that the output result according to described comparator 23 judges, obtain the distorsion signal of audio signal; According to the anti-distorsion ON-OFF control circuit 30 of the controlled anti-distorsion switch S break-make of distorsion signal of distorsion decision circuitry 27 output, the two ends of described anti-distorsion switch S connect two inputs of integral amplifier 22 respectively; Export the H-bridge circuit 24 of pulse drive signal to external loudspeaker according to the output result control of described comparator 23.
As an embodiment of the present utility model, in order to reduce influence of environmental noise, the first operational amplifier U1 or the second operational amplifier U2 are the fully differential operational amplifier, and perhaps both are the fully differential operational amplifier.
Fig. 2 is the distorsion decision circuitry structure chart of the D genus audio power amplifier of a kind of anti-distorsion of the utility model embodiment; Distorsion decision circuitry 27 comprises first trigger 271, second trigger 271 and NOR gate U7; The first input end of described first trigger 271 and the first input end of second trigger 272 are connected the output of comparator 23 respectively, second input of first trigger 271 all is connected with clock signal with second input of second trigger 272, and the output of the output of first trigger 271 and second trigger 272 is connected two inputs of NOR gate U7 respectively.
Fig. 3 is the anti-distorsion switch control structure figure of the D genus audio power amplifier of a kind of anti-distorsion of the utility model embodiment; Anti-distorsion ON-OFF control circuit 30 comprises inverter U8, the first switching tube M1, second switch pipe M2, the 3rd capacitor C 3, the five comparator U5, the 6th comparator U6 and NAND gate U9; The input of inverter U8 connects the output of distorsion decision circuitry 27 and the control end of second switch pipe M2, the output of inverter U8 connects the output of the first switching tube M1, the end of the first switching tube M1 connects reference voltage VREF, the other end of the first switching tube M1 connects the end of second switch pipe M2 and an end of the 3rd capacitor C 3, the other end of second switch pipe M2 is connected with ground with the other end of the 3rd capacitor C 3, the node of the first switching tube M1 and the 3rd capacitor C 3 is connected the inverting input of the 5th comparator U5 and the inverting input of the 6th comparator U6, the in-phase input end of the 5th comparator U5 is connected with the first pulse width modulation carrier signal RAMP, the in-phase input end of the 6th comparator U6 is connected with the second pulse width modulation carrier signal RAMP, and the output of the output of the 5th comparator U5 and the 6th comparator U6 is connected two inputs of NAND gate U9 respectively; The output of NAND gate U9 is connected with the control end of anti-distorsion switch S.In the present embodiment, the first switching tube M1 and second switch pipe M2 are the NMOS pipes.
Fig. 4 is the schematic block circuit diagram of the D genus audio power amplifier of a kind of anti-distorsion of the utility model second embodiment; This figure compared to Figure 1 also comprises: after the pulse drive signal of described H-bridge circuit output is carried out filtering, export the low pass filter 25 of external loudspeaker to; Be connected feedback resistance R7 and R8 between the input of the output of H-bridge circuit and described operational amplifier, form closed-loop structure; In order to suppress the noise that pulse width modulation carrier is introduced, improve the overall performance of amplifier.
Fig. 5 is the structure chart of comparator of the D genus audio power amplifier of a kind of anti-distorsion of the utility model embodiment; Comprise: the 3rd comparator U3 and the 4th comparator U4, the in-phase input end S01 of the 3rd comparator U3 is connected with the reversed-phase output of the second operational amplifier U2; The in-phase input end SO2 of the 4th comparator U4 is connected with the in-phase output end of the second operational amplifier U2; The inverting input of the inverting input of the 3rd comparator U3 and the 4th comparator U4 all is connected with pulse width modulation carrier signal source 26; The output PWM1 of the 3rd comparator U3 and the 4th comparator U4 is connected with the input of H-bridge circuit respectively with PWM2.
Below describe its operation principle in detail: audio signal through after the preliminary amplification of preamplifier 21 through the integral filtering of integral amplifier 22, the signal of output compares through the signal of comparator 23 with 26 outputs of pulse width modulation carrier signal source then, the signal of pulse width modulation carrier signal source 26 outputs is triangular wave RAMP in the present embodiment, form pulse-width modulation (PWM) waveform PWM1 and PWM2, the PWM waveform restores audio signal through driving loud speaker through the H bridge circuit.
In the time of audio frequency power amplifier work, when distorsion not occurring, the signal SO1 of integral amplifier 22 output and the amplitude of SO2 are that the signal of comparator 23 outputs is the frequency PWM waveform identical with the triangular wave frequency less than the amplitude of triangular wave RAMP.When distorsion occurring, the signal SO1 of integral amplifier 22 outputs and the amplitude of SO2 have surpassed the amplitude of triangular wave, and high level or the low level of one period long period can appear in the signal of comparator output, are the input and output oscillogram of comparator as shown in Figure 6; As signal SO1 during greater than the amplitude of triangular wave RAMP, the 3rd comparator U3 exports high level, otherwise, output low level; As signal SO2 during greater than the amplitude of triangular wave RAMP, the 4th comparator U3 exports high level, otherwise, output low level.
In Fig. 3, when distorsion not occurring, the high level off switch pipe M1 of CTRL1 opens switching tube M2 simultaneously.Level VC on the 3rd capacitor C 3 will discharge by M2, makes VC be lower than two triangular wave RAMP1 and RAMP2, through the 5th comparator U5 and the 6th comparator U6, relatively exports high level for two, and through NAND gate U9, output CTRL2 is fixing low level.This moment, anti-distorsion switch S was closed, and anti-distorsion function is not activated.
When unsweet sound phenomenon occurring, the low level of CTRL1 is opened switching tube M1, and reference voltage VREF will charge to the 3rd capacitor C 3.At this moment, the level VC of the 3rd capacitor C 3 upper ends will begin to raise by zero, the positive input terminal of the 5th comparator U5 and the 6th comparator U6 is opposite triangular wave RAMP1 and the RAMP2 of input phase respectively, and wherein triangular wave RAMP1 is identical with triangular wave RAMP, and RAMP2 is opposite with the RAMP phase place.When the level VC of the 3rd capacitor C 3 upper ends is elevated to when can compare with triangular wave, will relatively produce waveform A and B with two triangular waves, produce anti-distorsion switch controlling signal CTRL2 through NAND gate U9 then, when electric capacity upper side level VC is higher than RAMP1 and RAMP2, the anti-distorsion switch controlling signal CTRL2 of output will become high level by original low level, being formed with the square wave of certain duty ratio, is each node oscillogram of anti-distorsion ON-OFF control circuit of the D genus audio power amplifier of a kind of anti-distorsion of the utility model embodiment as Fig. 8.It is high more that the level VC of electric capacity upper end rises, and the shared ratio of the high level of CTRL2 is just big more.
The high level of CTRL2 control signal, the distorsion switch S can be closed, will during this period of time move the audio signal that is input to integral amplifier 22 to common mode electrical level like this and get on, Fig. 9 is the contrast oscillogram before and after the anti-distorsion switch of the D genus audio power amplifier of a kind of anti-distorsion of the utility model embodiment is controlled; The energy of the audio signal of preamplifier 21 outputs just is weakened, the SIN1 signal is through behind the integral amplifier 22, its amplitude will diminish, SO1 as Fig. 9, when the signal amplitude of exporting through integral amplifier 22 back the time less than the amplitude of triangular wave, just can not occur unsweet sound phenomenon again, CTRL2 just can not form high level more yet.Thereby guarantee unsweet sound phenomenon can not occur.The signal of comparator 23 outputs further drives speaker operation through H-bridge circuit 24, and the principle of H-bridge circuit is conventionally known to one of skill in the art, repeats no more herein.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (9)
1. the D genus audio power amplifier of an anti-distorsion is characterized in that, comprising:
The preamplifier adjusted of audio signal to input;
The audio signal of described preamplifier output is carried out the integral amplifier of processing and amplifying, be electrically connected with described preamplifier;
Audio signal to described integral amplifier output is carried out the comparator that pulse-width modulation is handled, and its audio signal input end is electrically connected with the output of described integral amplifier, and the modulation signal input then is connected to a pulse width modulation carrier signal source;
To the distorsion decision circuitry that the output result according to described comparator judges, obtain the distorsion signal of audio signal;
According to the anti-distorsion ON-OFF control circuit of the controlled anti-distorsion switch on and off of distorsion signal of distorsion decision circuitry output, the two ends of described anti-distorsion switch connect two inputs of integral amplifier respectively;
Export the H-bridge circuit of pulse drive signal to external loudspeaker according to the output result control of described comparator.
2. the D genus audio power amplifier of a kind of anti-distorsion according to claim 1 is characterized in that, described distorsion decision circuitry comprises first trigger, second trigger and NOR gate; The first input end of described first trigger and the first input end of second trigger are connected the output of comparator respectively, second input of first trigger all is connected with clock signal with second input of second trigger, and the output of the output of first trigger and second trigger is connected two inputs of NOR gate respectively.
3. the D genus audio power amplifier of a kind of anti-distorsion according to claim 1, it is characterized in that, described anti-distorsion ON-OFF control circuit comprises inverter, first switching tube, second switch pipe, the 3rd electric capacity, the 5th comparator, the 6th comparator and NAND gate; The input of described inverter connects the output of distorsion decision circuitry and the control end of second switch pipe, the output of inverter connects first output end of switching tube, one end of first switching tube connects reference voltage, the other end of first switching tube connects an end of second switch pipe and an end of the 3rd electric capacity, the other end of the other end of second switch pipe and the 3rd electric capacity is connected with ground, the node of first switching tube and the 3rd electric capacity is connected the inverting input of the 5th comparator and the inverting input of the 6th comparator, the in-phase input end of the 5th comparator is connected with the first pulse width modulation carrier signal source, the in-phase input end of the 6th comparator is connected with the second pulse width modulation carrier signal source, and the output of the output of the 5th comparator and the 6th comparator is connected two inputs of NAND gate respectively; The output of NAND gate is connected with the control end of anti-distorsion switch.
4. the D genus audio power amplifier of a kind of anti-distorsion according to claim 1 is characterized in that, also comprises: after the pulse drive signal of described H-bridge circuit output is carried out filtering, export the low pass filter of external loudspeaker to.
5. the D genus audio power amplifier of a kind of anti-distorsion according to claim 1 is characterized in that, also comprises: be connected the feedback resistance between the input of the output of described H-bridge circuit and described operational amplifier, form closed-loop structure.
6. the D genus audio power amplifier of a kind of anti-distorsion according to claim 1 is characterized in that, described preamplifier comprises: to first operational amplifier handled of audio signal of input; Be connected first resistance between the in-phase input end of the reversed-phase output of described first operational amplifier and described first operational amplifier; Be connected second resistance between the inverting input of the in-phase output end of described first operational amplifier and described first operational amplifier.
7. the D genus audio power amplifier of a kind of anti-distorsion according to claim 1 is characterized in that, described integral amplifier comprises:
Second operational amplifier that the audio signal of described preamplifier output is handled;
Be connected first electric capacity between the in-phase input end of the reversed-phase output of described second operational amplifier and described second operational amplifier;
Be connected second electric capacity between the inverting input of the in-phase output end of described second operational amplifier and described second operational amplifier.
8. according to the D genus audio power amplifier of claim 6 or 7 described a kind of anti-distorsions, it is characterized in that described first operational amplifier or described second operational amplifier are the fully differential operational amplifier.
9. the D genus audio power amplifier of a kind of anti-distorsion according to claim 1 is characterized in that, described comparator comprises first comparator and second comparator; The in-phase input end of described first comparator is connected with the reversed-phase output of described second operational amplifier; The in-phase input end of described second comparator is connected with the in-phase output end of described second operational amplifier, and the inverting input of the inverting input of described first comparator and described second comparator all is connected with described pulse width modulation carrier signal source.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010202497020U CN201781459U (en) | 2010-06-30 | 2010-06-30 | Distortion-prevention class-D audio power amplifier |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010202497020U CN201781459U (en) | 2010-06-30 | 2010-06-30 | Distortion-prevention class-D audio power amplifier |
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| CN201781459U true CN201781459U (en) | 2011-03-30 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102931931A (en) * | 2012-11-16 | 2013-02-13 | 上海贝岭股份有限公司 | Anti-sound break circuit for D-class power amplifier chip |
| CN102983825A (en) * | 2012-11-16 | 2013-03-20 | 上海贝岭股份有限公司 | Category D amplifier chip |
| CN104950722A (en) * | 2015-06-16 | 2015-09-30 | 无锡中星微电子有限公司 | Power supply circuit for terminal equipment |
| CN109756817A (en) * | 2017-11-03 | 2019-05-14 | 福州瑞芯微电子股份有限公司 | D audio frequency amplifier and its noise suppressing method |
| CN113541480A (en) * | 2021-09-15 | 2021-10-22 | 武汉市聚芯微电子有限责任公司 | Voltage-stabilizing power regulating circuit, power regulating device and electronic device |
| WO2024041267A1 (en) * | 2022-08-24 | 2024-02-29 | 骏盈半导体(上海)有限公司 | Audio power amplifier circuit, and duty ratio modulation circuit and noise suppression circuit thereof |
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2010
- 2010-06-30 CN CN2010202497020U patent/CN201781459U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102931931A (en) * | 2012-11-16 | 2013-02-13 | 上海贝岭股份有限公司 | Anti-sound break circuit for D-class power amplifier chip |
| CN102983825A (en) * | 2012-11-16 | 2013-03-20 | 上海贝岭股份有限公司 | Category D amplifier chip |
| CN102931931B (en) * | 2012-11-16 | 2015-07-08 | 上海贝岭股份有限公司 | Anti-sound break circuit for D-class power amplifier chip |
| CN102983825B (en) * | 2012-11-16 | 2016-01-13 | 上海贝岭股份有限公司 | A kind of category D amplifier chip |
| CN104950722A (en) * | 2015-06-16 | 2015-09-30 | 无锡中星微电子有限公司 | Power supply circuit for terminal equipment |
| CN109756817A (en) * | 2017-11-03 | 2019-05-14 | 福州瑞芯微电子股份有限公司 | D audio frequency amplifier and its noise suppressing method |
| CN109756817B (en) * | 2017-11-03 | 2020-04-10 | 福州瑞芯微电子股份有限公司 | Class D audio amplifier and noise suppression method thereof |
| CN113541480A (en) * | 2021-09-15 | 2021-10-22 | 武汉市聚芯微电子有限责任公司 | Voltage-stabilizing power regulating circuit, power regulating device and electronic device |
| WO2024041267A1 (en) * | 2022-08-24 | 2024-02-29 | 骏盈半导体(上海)有限公司 | Audio power amplifier circuit, and duty ratio modulation circuit and noise suppression circuit thereof |
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