CN203523020U - Audio power amplifier circuit and wireless loudspeaker box - Google Patents
Audio power amplifier circuit and wireless loudspeaker box Download PDFInfo
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- CN203523020U CN203523020U CN201320631112.8U CN201320631112U CN203523020U CN 203523020 U CN203523020 U CN 203523020U CN 201320631112 U CN201320631112 U CN 201320631112U CN 203523020 U CN203523020 U CN 203523020U
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Abstract
The utility model discloses an audio power amplifier circuit and a wireless loudspeaker box. The audio power amplifier circuit connected with a loudspeaker comprises an alternating-current input terminal, a power supply module, a wireless receiving module and a power amplifier module; the power supply module includes an electro magnetic interference (EMI) filter unit and a rectifier filter unit; and the power amplifier module includes a pre-stage processing unit, a half-bridge driving unit and a half-bridge conversion unit. According to the audio power amplifier circuit, on the basis of the EMI filter unit and the rectifier filter unit, the input high-voltage alternating current is converted into a high-voltage direct current; the high-voltage direct current is directly inputted into a voltage detection terminal of the pre-stage processing unit; and the pre-stage processing unit carries out compensation on a PWM signal according to the detected high-voltage direct current. Because there is no need for the power supply module to carry out voltage reduction processing on the high-voltage direct current, the power conversion unit that is arranged in the traditional power supply module and is used for carrying out voltage reduction processing on the high-voltage direct current is reduced, thereby simplifying the structure of the audio power amplifier circuit, lowering the circuit cost and the improving the energy conversion efficiency.
Description
Technical field
The utility model relates to audio frequency apparatus technical field, relates in particular to a kind of audio power amplifier circuit and wireless sound box.
Background technology
The audio power amplifier circuit framework that existing high-power wireless audio amplifier adopts as shown in Figure 1, comprise power module 10, wireless receiving module 20, power amplifier module 30 and loud speaker 40, wherein, power module 10 comprises EMI(Electro Magnetic Interference, electromagnetic interference) filter unit 11, rectification filtering unit 12 and power conversion unit 13.In Fig. 1, High Level AC Voltage AC is after EMI filter unit 11 filtering electromagnetic interference, be input to rectification filtering unit 12 and carry out being converted to high voltage direct current after rectification, filtering, power conversion unit 13 carries out this high voltage direct current exporting low-voltage DC to power amplifier module 30 after step-down again.Audio power amplifier circuit shown in Fig. 1 comprises the power conversion unit 13 in power module 10, and power amplifier module 30 two-stage energy conversion modules, and circuit structure complexity and effciency of energy transfer are low, and circuit cost is also higher.
Utility model content
Main purpose of the present utility model is to propose a kind of audio power amplifier circuit and wireless sound box, is intended to simplify the structure of audio power amplifier circuit, reduces circuit cost, improves effciency of energy transfer.
In order to achieve the above object, the utility model proposes a kind of audio power amplifier circuit, this audio power amplifier circuit is connected with loud speaker, comprise alternating current input, power module, wireless receiving module and power amplifier module, described power module comprises EMI filter unit and rectification filtering unit, described power amplifier module comprises the prime processing unit for the integrated audio signal of described wireless receiving module output is converted to pwm signal and according to the high voltage direct current of described rectification filtering unit output, described pwm signal is compensated, for export the half bridge drive unit of corresponding drive control signal according to the level state of described pwm signal, and for described pwm signal being reduced into according to described drive control signal to the semi-bridge alternation unit of audio carrier signal,
Described alternating current input is connected with the detecting voltage end of described prime processing unit via described EMI filter unit, described rectification filtering unit successively, and be connected with the voltage input end of described semi-bridge alternation unit, the signal input part of described prime processing unit is connected with described wireless receiving module, and signal output part is connected with the control signal input of described half bridge drive unit; The driving signal output part of described half bridge drive unit is connected with the driving control end of described semi-bridge alternation unit, and the audio signal output end of described semi-bridge alternation unit is connected with described loud speaker.
Preferably, described rectification filtering unit comprises full-wave rectification bridge, the first filter capacitor and the second filter capacitor; The positive input terminal of described full-wave rectification bridge is connected with the first output of described EMI filter unit, the negative input end of described full-wave rectification bridge is connected with the second output of described EMI filter unit, the positive output end of described full-wave rectification bridge is connected with the detecting voltage end of described prime processing unit, and be connected the negative output terminal ground connection of described full-wave rectification bridge with the voltage input end of described semi-bridge alternation unit; The positive pole of described the first filter capacitor is connected with the positive output end of described full-wave rectification bridge, and the negative pole of described the first filter capacitor is connected with the positive pole of described the second filter capacitor, and is connected the minus earth of described the second filter capacitor with the first end of described loud speaker.
Preferably, described half bridge drive unit comprises half-bridge driven chip, and the driving control end of described semi-bridge alternation unit comprises that the first driving control end and second drives control end; The control signal input pin of described half-bridge driven chip is connected with the signal output part of described prime processing unit, the upper pipe control logic output pin of described half-bridge driven chip drives control end to be connected with first of described semi-bridge alternation unit, and the lower pipe control logic output pin of described half-bridge driven chip drives control end to be connected with second of described semi-bridge alternation unit.
Preferably, described semi-bridge alternation unit comprises the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, filter inductance and the 3rd filter capacitor; The grid of described the first metal-oxide-semiconductor is connected with the upper pipe control logic output pin of described half-bridge driven chip, the drain electrode of described the first metal-oxide-semiconductor is connected with the positive output end of described full-wave rectification bridge, the source electrode of described the first metal-oxide-semiconductor is connected with one end of described filter inductance, and is connected with the drain electrode of described the second metal-oxide-semiconductor; The grid of described the second metal-oxide-semiconductor is connected with the lower pipe control logic output pin of described half-bridge driven chip, the source ground of described the second metal-oxide-semiconductor; Described the 3rd one end of filter capacitor and the other end of described filter inductance are connected, and are connected the other end ground connection of described the 3rd filter capacitor with the second end of described loud speaker.
The utility model also proposes a kind of wireless sound box, this wireless sound box comprises loud speaker and audio power amplifier circuit, described audio power amplifier circuit is connected with described loud speaker, comprise alternating current input, power module, wireless receiving module and power amplifier module, described power module comprises EMI filter unit and rectification filtering unit, described power amplifier module comprises the prime processing unit for the integrated audio signal of described wireless receiving module output is converted to pwm signal and according to the high voltage direct current of described rectification filtering unit output, described pwm signal is compensated, for export the half bridge drive unit of corresponding drive control signal according to the level state of described pwm signal, and for described pwm signal being reduced into according to described drive control signal to the semi-bridge alternation unit of audio carrier signal,
Described alternating current input is connected with the detecting voltage end of described prime processing unit via described EMI filter unit, described rectification filtering unit successively, and be connected with the voltage input end of described semi-bridge alternation unit, the signal input part of described prime processing unit is connected with described wireless receiving module, and signal output part is connected with the control signal input of described half bridge drive unit; The driving signal output part of described half bridge drive unit is connected with the driving control end of described semi-bridge alternation unit, and the audio signal output end of described semi-bridge alternation unit is connected with described loud speaker.
The audio power amplifier circuit the utility model proposes, from alternating current input input High Level AC Voltage, this High Level AC Voltage is converted to high voltage direct current after the rectifying and wave-filtering of EMI filter unit, rectification filtering unit is processed, and is input to the detecting voltage end of prime processing unit; Wireless receiving module is demodulated into integrated audio signal by the audio carrier signal receiving, and export prime processing unit to, prime processing unit is converted to PWM(Pulse Width Modulation by this integrated audio signal, pulse width modulation) signal, and the high voltage direct current of detecting rectification filtering unit output, according to detected high voltage direct current, pwm signal is compensated, and export the pwm signal after compensation to described half bridge drive unit, to control semi-bridge alternation unit, pwm signal is reduced into audio carrier signal.Audio power amplifier circuit of the present utility model, the high voltage direct current of rectification filtering unit output is directly inputted to the detecting voltage end of prime processing unit, prime processing unit compensates pwm signal according to detected high voltage direct current, power module is without high voltage direct current is carried out to step-down processing, save in conventional power source module for high voltage direct current being carried out to the power conversion unit of step-down processing, thereby can simplify the structure of audio power amplifier circuit, reduce circuit cost, improve effciency of energy transfer.
Accompanying drawing explanation
Fig. 1 is the theory diagram of prior art sound intermediate frequency power amplifier;
Fig. 2 is the theory diagram of the utility model audio power amplifier circuit preferred embodiment;
Fig. 3 is the electrical block diagram of the utility model audio power amplifier circuit preferred embodiment.
The realization of the purpose of this utility model, functional characteristics and advantage, in connection with embodiment, and is described further with reference to accompanying drawing.
Embodiment
Below in conjunction with Figure of description and specific embodiment, further illustrate the technical solution of the utility model.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
The utility model proposes a kind of audio power amplifier circuit.
With reference to Fig. 2, Fig. 2 is the theory diagram of the utility model audio power amplifier circuit preferred embodiment.
In the utility model preferred embodiment, audio power amplifier circuit is preferably applied to wireless sound box, this audio power amplifier circuit is connected with the loud speaker 400 of wireless sound box, this audio power amplifier circuit comprises alternating current input AC_IN, power module 100, wireless receiving module 200 and power amplifier module 300, power module 100 comprises EMI filter unit 110 and rectification filtering unit 120, and power amplifier module 300 comprises prime processing unit 310, half bridge drive unit 320 and semi-bridge alternation unit 330.Prime processing unit 310 is for being converted to pwm signal by the integrated audio signal of wireless receiving module 200 outputs, and according to the high voltage direct current of stream filter unit 120 outputs, pwm signal is compensated, half bridge drive unit 320 is for exporting corresponding drive control signal according to the level state of pwm signal, and semi-bridge alternation unit 330 is for being reduced into audio carrier signal according to drive control signal by described pwm signal.
Wherein, alternating current input AC_IN is connected with the detecting voltage end of prime processing unit 310 via EMI filter unit 110, rectification filtering unit 120 successively, and be connected with the voltage input end of semi-bridge alternation unit 330, the signal input part of prime processing unit 310 is connected with wireless receiving module 200, and the signal output part of prime processing unit 310 is connected with the control signal input of half bridge drive unit 320; The driving signal output part of half bridge drive unit 320 is connected with the driving control end of semi-bridge alternation unit 330, and the audio signal output end of semi-bridge alternation unit 330 is connected with loud speaker 400.
In the present embodiment, High Level AC Voltage is input to EMI filter unit 110 from alternating current input AC_IN, after electromagnetic interference in this High Level AC Voltage of EMI filter unit 110 filterings, export this High Level AC Voltage to rectification filtering unit 120 again, rectification filtering unit 120 carries out this High Level AC Voltage to be converted to high voltage direct current after rectifying and wave-filtering processing, and this high voltage direct current is exported to the detecting voltage end of prime processing unit 310, wireless receiving module 200 receives the audio carrier signal that audiogenic device (as host computer) sends, and after being demodulated into integrated audio signal, the audio carrier signal receiving exports prime processing unit 310 to, prime processing unit 310 is converted to pwm signal by this integrated audio signal again, and the high voltage direct current of prime processing unit 310 detecting rectification filtering unit 120 outputs, according to detected high voltage direct current, pwm signal is compensated, and export the pwm signal after compensation to half bridge drive unit 320, half bridge drive unit 320 is exported corresponding drive control signal to semi-bridge alternation unit 330 according to the level state of pwm signal, semi-bridge alternation unit 330 is reduced into audio carrier signal according to the drive control signal of half bridge drive unit 320 outputs by pwm signal, and play exporting loud speaker 400 to after audio carrier signal amplification.
With respect to prior art, audio power amplifier circuit of the present utility model, the high voltage direct current of rectification filtering unit 120 outputs is directly inputted to the detecting voltage end of prime processing unit 310, prime processing unit 310 compensates pwm signal according to detected high voltage direct current, power module 100 is without high voltage direct current is carried out to step-down processing, save in conventional power source module for high voltage direct current being carried out to the power conversion unit (as the power conversion unit 13 of Fig. 1) of step-down processing, thereby can simplify the structure of audio power amplifier circuit, reduce circuit cost, can improve the effciency of energy transfer of audio power amplifier circuit simultaneously.
Audio power amplifier circuit shown in comparison diagram 1 and Fig. 2, if the energy conversion efficiency of the power conversion unit 13 of power module 10 is 85% in Fig. 1, in Fig. 1, the energy conversion efficiency of power amplifier module 30 is 85%, and the energy conversion efficiency of the audio power amplifier circuit shown in Fig. 1 is 72%(85%*85%=72%); If the energy conversion efficiency of power amplifier module 300 is also 85% in Fig. 2, the energy conversion efficiency of the audio power amplifier circuit shown in Fig. 2 is 85%, the energy conversion efficiency of hence one can see that the utility model audio power amplifier circuit is with respect to existing audio power amplifier circuit, and its energy conversion efficiency has improved 13%.
Refer again to Fig. 3, Fig. 3 is the electrical block diagram of the utility model audio power amplifier circuit preferred embodiment.
As shown in Figure 3, rectification filtering unit 120 comprises full-wave rectification bridge BD1, the first filter capacitor CE1 and the second filter capacitor CE2.
The positive input terminal a of full-wave rectification bridge BD1 is connected with the first output of EMI filter unit 110, the negative input end b of full-wave rectification bridge BD1 is connected with the second output of EMI filter unit 110, the positive output end c of full-wave rectification bridge BD1 is connected with the detecting voltage end of prime processing unit 310, and be connected the negative output terminal d ground connection of full-wave rectification bridge BD1 with the voltage input end of semi-bridge alternation unit 330; The positive pole of the first filter capacitor CE1 is connected with the positive output end c of full-wave rectification bridge BD1, and the negative pole of the first filter capacitor CE1 is connected with the positive pole of the second filter capacitor CE2, and is connected the minus earth of the second filter capacitor CE2 with the first end of loud speaker 400.
The structure of the EMI filter unit 110 of the present embodiment, wireless receiving module 200 and prime processing unit 310 is identical with the structure of EMI filter unit, wireless receiving module and prime processing unit in conventional audio power amplifier, at this, does not illustrate.
In the present embodiment, half bridge drive unit 320 comprises half-bridge driven chip U1, and the driving control end of semi-bridge alternation unit 330 comprises that the first driving control end and second drives control end.
The control signal input pin IN of half-bridge driven chip U1 is connected with the signal output part of prime processing unit 310, the upper pipe control logic output pin HO of half-bridge driven chip U1 drives control end to be connected with first of semi-bridge alternation unit 330, and the lower pipe control logic output pin LO of half-bridge driven chip U1 drives control end to be connected with second of semi-bridge alternation unit 330.
Particularly, semi-bridge alternation unit 330 comprises the first metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, filter inductance L1 and the 3rd filter capacitor C1; The first metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2 are NMOS pipe, and filter inductance L1 and the 3rd filter capacitor C1 form a LC low pass filter.
The grid of the first metal-oxide-semiconductor M1 is connected with the upper pipe control logic output pin HO of half-bridge driven chip U1, the drain electrode of the first metal-oxide-semiconductor M1 is connected with the positive output end c of full-wave rectification bridge BD1, the source electrode of the first metal-oxide-semiconductor M1 is connected with one end of filter inductance L1, and is connected with the drain electrode of the second metal-oxide-semiconductor M2; The grid of the second metal-oxide-semiconductor M2 is connected with the lower pipe control logic output pin LO of half-bridge driven chip U1, the source ground of the second metal-oxide-semiconductor M2; One end of the 3rd filter capacitor C1 is connected with the other end of filter inductance L1, and is connected the other end ground connection of the 3rd filter capacitor C1 with the second end of loud speaker 400.
The operation principle of the utility model audio power amplifier circuit specifically describes as follows:
High Level AC Voltage (as 220V alternating current) is input to EMI filter unit 110 from alternating current input AC_IN, after electromagnetic interference in this High Level AC Voltage of EMI filter unit 110 filterings, export this High Level AC Voltage to rectification filtering unit 120 again, rectification filtering unit 120 carries out this High Level AC Voltage to be converted to high voltage direct current after rectifying and wave-filtering processing, and this high voltage direct current is exported to the detecting voltage end of prime processing unit 310.
After audio power amplifier circuit of the present utility model saves the power conversion unit in conventional power source module, still there is the function of existing audio power amplifier circuit, and energy conversion efficiency is higher.
The utility model also proposes a kind of wireless sound box, this wireless sound box comprises loud speaker 400 and audio power amplifier circuit, this audio power amplifier circuit is connected with loud speaker 400, and the structure of this audio power amplifier circuit, operation principle and the beneficial effect that brings, all with reference to above-described embodiment, repeat no more herein.
The foregoing is only preferred embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model specification and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (5)
1. an audio power amplifier circuit, be connected with loud speaker, comprise alternating current input, power module, wireless receiving module and power amplifier module, it is characterized in that, described power module comprises EMI filter unit and rectification filtering unit, described power amplifier module comprises the prime processing unit for the integrated audio signal of described wireless receiving module output is converted to pwm signal and according to the high voltage direct current of described rectification filtering unit output, described pwm signal is compensated, for export the half bridge drive unit of corresponding drive control signal according to the level state of described pwm signal, and for described pwm signal being reduced into according to described drive control signal to the semi-bridge alternation unit of audio carrier signal,
Described alternating current input is connected with the detecting voltage end of described prime processing unit via described EMI filter unit, described rectification filtering unit successively, and be connected with the voltage input end of described semi-bridge alternation unit, the signal input part of described prime processing unit is connected with described wireless receiving module, and signal output part is connected with the control signal input of described half bridge drive unit; The driving signal output part of described half bridge drive unit is connected with the driving control end of described semi-bridge alternation unit, and the audio signal output end of described semi-bridge alternation unit is connected with described loud speaker.
2. audio power amplifier circuit as claimed in claim 1, is characterized in that, described rectification filtering unit comprises full-wave rectification bridge, the first filter capacitor and the second filter capacitor;
The positive input terminal of described full-wave rectification bridge is connected with the first output of described EMI filter unit, the negative input end of described full-wave rectification bridge is connected with the second output of described EMI filter unit, the positive output end of described full-wave rectification bridge is connected with the detecting voltage end of described prime processing unit, and be connected the negative output terminal ground connection of described full-wave rectification bridge with the voltage input end of described semi-bridge alternation unit;
The positive pole of described the first filter capacitor is connected with the positive output end of described full-wave rectification bridge, and the negative pole of described the first filter capacitor is connected with the positive pole of described the second filter capacitor, and is connected the minus earth of described the second filter capacitor with the first end of described loud speaker.
3. audio power amplifier circuit as claimed in claim 2, is characterized in that, described half bridge drive unit comprises half-bridge driven chip, and the driving control end of described semi-bridge alternation unit comprises that the first driving control end and second drives control end;
The control signal input pin of described half-bridge driven chip is connected with the signal output part of described prime processing unit, the upper pipe control logic output pin of described half-bridge driven chip drives control end to be connected with first of described semi-bridge alternation unit, and the lower pipe control logic output pin of described half-bridge driven chip drives control end to be connected with second of described semi-bridge alternation unit.
4. audio power amplifier circuit as claimed in claim 3, is characterized in that, described semi-bridge alternation unit comprises the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, filter inductance and the 3rd filter capacitor;
The grid of described the first metal-oxide-semiconductor is connected with the upper pipe control logic output pin of described half-bridge driven chip, the drain electrode of described the first metal-oxide-semiconductor is connected with the positive output end of described full-wave rectification bridge, the source electrode of described the first metal-oxide-semiconductor is connected with one end of described filter inductance, and is connected with the drain electrode of described the second metal-oxide-semiconductor; The grid of described the second metal-oxide-semiconductor is connected with the lower pipe control logic output pin of described half-bridge driven chip, the source ground of described the second metal-oxide-semiconductor; Described the 3rd one end of filter capacitor and the other end of described filter inductance are connected, and are connected the other end ground connection of described the 3rd filter capacitor with the second end of described loud speaker.
5. a wireless sound box, comprises loud speaker, it is characterized in that, also comprises the audio power amplifier circuit described in any one in claim 1 to 4, and described audio power amplifier circuit is connected with described loud speaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320631112.8U CN203523020U (en) | 2013-10-12 | 2013-10-12 | Audio power amplifier circuit and wireless loudspeaker box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320631112.8U CN203523020U (en) | 2013-10-12 | 2013-10-12 | Audio power amplifier circuit and wireless loudspeaker box |
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| Publication Number | Publication Date |
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| CN203523020U true CN203523020U (en) | 2014-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320631112.8U Expired - Lifetime CN203523020U (en) | 2013-10-12 | 2013-10-12 | Audio power amplifier circuit and wireless loudspeaker box |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107371095A (en) * | 2017-08-25 | 2017-11-21 | 东莞中拓机械技术开发有限公司 | A kind of pulsewidth modulation 350W 600W+150W power amplifier modules |
| CN110071694A (en) * | 2018-01-22 | 2019-07-30 | 深圳市澳德新能源科技有限公司 | Audio power amplifier circuit |
-
2013
- 2013-10-12 CN CN201320631112.8U patent/CN203523020U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107371095A (en) * | 2017-08-25 | 2017-11-21 | 东莞中拓机械技术开发有限公司 | A kind of pulsewidth modulation 350W 600W+150W power amplifier modules |
| CN107371095B (en) * | 2017-08-25 | 2023-12-22 | 东莞精恒电子有限公司 | Pulse width modulation 350W-600W+150W power amplifier module |
| CN110071694A (en) * | 2018-01-22 | 2019-07-30 | 深圳市澳德新能源科技有限公司 | Audio power amplifier circuit |
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Granted publication date: 20140402 |