CN102420572A - Equipment with audio power amplifier - Google Patents
Equipment with audio power amplifier Download PDFInfo
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- CN102420572A CN102420572A CN2011103756604A CN201110375660A CN102420572A CN 102420572 A CN102420572 A CN 102420572A CN 2011103756604 A CN2011103756604 A CN 2011103756604A CN 201110375660 A CN201110375660 A CN 201110375660A CN 102420572 A CN102420572 A CN 102420572A
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Abstract
The invention relates to equipment with an audio power amplifier. The equipment comprises a power supply circuit, an audio processing circuit, a power amplifier which is connected with the output end of the audio processing circuit, a control circuit, and an audio output protection circuit which is connected to the output end of the power amplifier, wherein the power supply circuit supplies power to the respective modules of the equipment with the audio power amplifier; the control circuit is used for controlling functions of the power supply circuit, the audio processing circuit and the power amplifier; the audio output protection circuit comprises a direct-current detection module for detecting a direct-current component in an output signal of a power amplification circuit; when the direct-current component is greater than a preset value, the direct-current detection module outputs a protection signal to the control circuit; and the control circuit controls the power supply module to cut off the power amplifier according to the protection signal. The audio output protection circuit of the equipment with the audio power amplifier monitors the output signal of the power amplifier in real time; when the direct-current component is overlarge, the power amplifier is cut off; therefore, further damage to the power amplifier is avoided.
Description
Technical field
The present invention relates to equipment, especially a kind of equipment with band audio frequency power amplifier of audio frequency output protection circuit with audio frequency power amplifier.
Background technology
The equipment of existing band audio frequency power amplifier; For example the output of the audio frequency in home theater direct current offset protective circuit adopts active low-pass filter to realize the detection to direct current offset more; Simultaneously in the audio frequency output loop, seal in relay, reach the purpose of breaking off output loop protection loudspeaker thereby when system detects direct current output, break off relay.Because mostly the generation of direct current offset is to have protected loudspeaker because the damage of power amplifier causes though break off the mode of relay essentially, can't fundamentally protect power amplification system to avoid further infringement.
Summary of the invention
The object of the present invention is to provide a kind of equipment of when the power amplifier output DC component is excessive, closing the band audio frequency power amplifier of power amplifier.
A kind of equipment with audio frequency power amplifier, it comprises power circuit, audio frequency processing circuit, the power amplifier, the control circuit that are connected with the output of audio frequency processing circuit and the audio frequency output protection circuit that is connected the power amplifier output.Power circuit is each module for power supply of the equipment of band audio frequency power amplifier.Control circuit is used for power circuit, audio frequency processing circuit and power amplifier are carried out function control.Said audio frequency output protection circuit comprises the direct current detection module of the DC component of the output signal that is used for the detection power amplifying circuit; The direct current detection module is to said control circuit output protection signal during greater than preset value when said DC component, and said control circuit is according to said guard signal control power module switch-off power amplifier.
In a preferred embodiment, said dc detection circuit comprises passive low-pass first order filter and switching tube unit; Said passive low-pass first order filter is used for the AC signal of the said output signal of filtering, and wherein DC component is outputed to the pipe unit that opens the light; Said switching tube unit said DC component during greater than preset value conducting with to control circuit output protection signal.
In a preferred embodiment, said switching tube unit can comprise first switching tube, and said passive low-pass first order filter comprises first resistance, second resistance, the 3rd resistance and first electric capacity; One end of said first resistance links to each other with the output of power amplifier, and the other end links to each other with an end of first electric capacity and an end of second resistance; The other end ground connection of first electric capacity; The other end of second resistance links to each other with first control end of switching tube; First end of first switching tube connects a direct current voltage source through the 3rd resistance, and the output as dc detection circuit links to each other the second end ground connection of first switching tube with control circuit simultaneously.
In a preferred embodiment; Said switching tube unit also can comprise the second switch pipe; Said dc detection circuit comprises passive low-pass first order filter and second switch pipe, and said passive low-pass first order filter comprises the 4th resistance, the 5 resistance, the 6th resistance, the 7th resistance and second electric capacity; One end of said the 4th resistance links to each other with the output of power amplifier, and the other end links to each other with an end of second electric capacity and an end of the 5th resistance; The other end ground connection of second electric capacity; The other end of the 5th resistance links to each other with second end of second switch pipe, and through the 7th grounding through resistance; The control end ground connection of second switch pipe, its first end connects a direct current voltage source through the 6th resistance, and the output as dc detection circuit links to each other with control circuit simultaneously.
In a preferred embodiment, said control circuit also passes through the alarm module output alarm signal when receiving said guard signal.Said alarm module comprises at least a in following: indicator light, display and buzzer.
The audio frequency output protection circuit of the equipment of band audio frequency power amplifier of the present invention is monitored the output signal of power amplifier in real time, when DC component is excessive, closes power amplifier, avoids power amplifier further to suffer damage.
Description of drawings
Fig. 1 is the circuit structure block diagram of equipment of the band audio frequency power amplifier of an embodiment.
Fig. 2 is the circuit theory diagrams of the dc detection circuit of an embodiment.
Fig. 3 is the circuit theory diagrams of the dc detection circuit of another embodiment.
Embodiment
To combine specific embodiment and accompanying drawing that the equipment of band audio frequency power amplifier of the present invention is described in further detail below.
As shown in Figure 1, in the preferred embodiment, the equipment of band audio frequency power amplifier mainly comprises memory, audio frequency processing circuit, power amplifier, power module, control circuit and audio frequency output protection circuit.
Memory is mainly used in the control program of storage control circuit.Audio frequency processing circuit is used for audio signal is handled, with the audio signal of output desired effects.The function of audio frequency processing circuit includes but not limited to decoding, carries out functions such as audio frequency special effect processing and noise reduction process.Power amplifier is used for above-mentioned audio signal is carried out exporting to built-in or external loudspeaker after the power amplification.Control circuit is mainly used in each module in the equipment of band audio frequency power amplifier is carried out function control, and among other embodiment, control module and audio frequency processing circuit can integrate.Power circuit is used to each interior module for power supply of equipment of band audio frequency power amplifier.
The audio frequency output protection circuit is used for the output signal of real-time detection power amplifying circuit, has judged whether unusual and instant notice control circuit.In the present embodiment, the audio frequency output protection circuit comprises the direct current detection module of the DC component of an output signal that is used for the detection power amplifying circuit.When this DC component during greater than preset value the direct current detection module export a guard signal to control circuit, as response, control circuit control power module switch-off power amplifier reaches the purpose of protection power amplifier.Concrete; Dc detection circuit comprises passive low-pass first order filter and switching tube unit; Wherein passive low-pass first order filter is used for the AC signal of the said output signal of filtering; DC component is wherein outputed to the pipe unit that opens the light, the switching tube unit detected DC component during greater than preset value conducting with to control circuit output protection signal.
In the present embodiment, as shown in Figure 2, the switching tube unit comprises the first switching tube Q1.Passive low-pass first order filter comprises first resistance R 1, second resistance R 2, the 3rd resistance R 3 and first capacitor C 1.One end of first resistance R 1 links to each other with the output of power amplifier, and the other end links to each other with an end of first capacitor C 1 and an end of second resistance R 2.The other end ground connection of first capacitor C 1.The other end of second resistance R 2 links to each other with the control end of the first switching tube Q1.First end of the first switching tube Q1 meets a direct current voltage source V CC through the 3rd resistance R 3, and the output as dc detection circuit links to each other the second end ground connection of the first switching tube Q1 with control circuit simultaneously.In the present embodiment, the first switching tube Q1 adopts triode.First end of switching tube Q1 is the collector electrode of triode, and control end is the base stage of triode, and second end is the emitter of triode.Understandable, switching tubes such as available IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) or MOS (Metal-Oxid-Semiconductor, Metal-oxide-semicondutor) transistor replace triode.
The output signal of power amplifier obtains a direct current signal through behind the passive low-pass first order filter, and this direct current signal is input to the control end of the first switching tube Q1 after through second resistance R 2.When the first switching tube Q1 conducting during greater than 0.7V of the voltage of first end of the first switching tube Q1, to the low level of control circuit output as guard signal.Based on transistor characteristic, the minimum dc response voltage of this circuit is 0.7V.After control circuit detected low level, the control power circuit changed the purpose that the level that outputs to power amplifier is reached the switch-off power APS amplifier power supply.Simultaneously control circuit can pass through alarm module, for example indicator light, display or buzzer output alarm signal, and the prompting user turn-offs the power supply of whole system, and system is checked or send and repair.
Present embodiment also provides one and above-mentioned dc detection circuit structure and the similar dc detection circuit of operation principle, and as shown in Figure 3, the switching tube unit comprises second switch pipe Q2.Passive low-pass first order filter comprises the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7 and second capacitor C 2.One end of the 4th resistance R 4 links to each other with the output of power amplifier, and the other end links to each other with an end of second capacitor C 2 and an end of the 5th resistance R 5.The other end ground connection of second capacitor C 2.The other end of the 5th resistance R 5 links to each other with second end of second switch pipe Q2, and through the 7th resistance R 7 ground connection.The control end ground connection of second switch pipe Q2, its first end meets a direct current voltage source V CC through the 6th resistance R 6, and the output as dc detection circuit links to each other with control circuit simultaneously.This circuit is applicable to the power amplifier of negative pressure power supply.When the second switch pipe Q2 conducting during less than-0.7V of second terminal voltage of second switch pipe Q2.
For the audio frequency power amplifier system of multichannel output, the dc detection circuit that only needs to increase respective numbers gets final product.Dc detection circuit is connected to the power amplifier output of each sound channel correspondingly, and the output signal of each dc detection circuit all is connected to control circuit.When the DC component of any sound channel during greater than preset value control circuit all can close corresponding power amplifier.
Audio frequency output protection circuit of the present invention the DC component of power amplifier output during greater than preset value through the mode of turn-offing amplifier power supply protected that power amplification system avoids further infringement maybe.And this kind protected mode has further reduced product cost, and has had quicker response owing to do not re-use relay.
Though the description of this invention combines above specific embodiment to carry out,, those skilled in the art that can carry out many replacements, modification and variation according to above-mentioned content, be conspicuous.Therefore, all are such substitute, improve and change all is included in the spirit and scope of attached claim.
Claims (6)
1. equipment with audio frequency power amplifier; Comprise power circuit, audio frequency processing circuit, the power amplifier, the control circuit that are connected with the output of audio frequency processing circuit and the audio frequency output protection circuit that is connected the power amplifier output; Power circuit is each module for power supply of the equipment of band audio frequency power amplifier; Control circuit is used for power circuit, audio frequency processing circuit and power amplifier are carried out function control; It is characterized in that; Said audio frequency output protection circuit comprises the direct current detection module of the DC component of the output signal that is used for the detection power amplifying circuit, and the direct current detection module is to said control circuit output protection signal during greater than preset value when said DC component, and said control circuit is according to said guard signal control power module switch-off power amplifier.
2. the equipment of band audio frequency power amplifier according to claim 1 is characterized in that, said dc detection circuit comprises passive low-pass first order filter and switching tube unit; Said passive low-pass first order filter is used for the AC signal of the said output signal of filtering, and wherein DC component is outputed to the pipe unit that opens the light; Said switching tube unit said DC component during greater than preset value conducting with to control circuit output protection signal.
3. the equipment of band audio frequency power amplifier according to claim 2 is characterized in that, said switching tube unit comprises first switching tube, and said passive low-pass first order filter comprises first resistance, second resistance, the 3rd resistance and first electric capacity; One end of said first resistance links to each other with the output of power amplifier, and the other end links to each other with an end of first electric capacity and an end of second resistance; The other end ground connection of first electric capacity; The other end of second resistance links to each other with first control end of switching tube; First end of first switching tube connects a direct current voltage source through the 3rd resistance, and the output as dc detection circuit links to each other the second end ground connection of first switching tube with control circuit simultaneously.
4. the equipment of band audio frequency power amplifier according to claim 2 is characterized in that, said switching tube unit comprises the second switch pipe, and said passive low-pass first order filter comprises the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance and second electric capacity; One end of said the 4th resistance links to each other with the output of power amplifier, and the other end links to each other with an end of second electric capacity and an end of the 5th resistance; The other end ground connection of second electric capacity; The other end of the 5th resistance links to each other with second end of second switch pipe, and through the 7th grounding through resistance; The control end ground connection of second switch pipe, its first end connects a direct current voltage source through the 6th resistance, and the output as dc detection circuit links to each other with control circuit simultaneously.
5. according to the equipment of each described band audio frequency power amplifier in the claim 1 to 4, it is characterized in that, said control circuit when receiving said guard signal also through the alarm module output alarm signal.
6. the equipment of band audio frequency power amplifier according to claim 5 is characterized in that, said alarm module comprises at least a in following: indicator light, display and buzzer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103756604A CN102420572A (en) | 2011-11-23 | 2011-11-23 | Equipment with audio power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103756604A CN102420572A (en) | 2011-11-23 | 2011-11-23 | Equipment with audio power amplifier |
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| CN102420572A true CN102420572A (en) | 2012-04-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011103756604A Pending CN102420572A (en) | 2011-11-23 | 2011-11-23 | Equipment with audio power amplifier |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694506A (en) * | 2012-06-06 | 2012-09-26 | 国光电器股份有限公司 | Audio-frequency amplifier system powered based on power supply of computer USB (Universal Serial Bus) power source and integration of USB audio card |
| CN102752689A (en) * | 2012-06-28 | 2012-10-24 | 惠州市德赛视听科技有限公司 | Audio power amplifier output gain control device and control method thereof |
| CN106658295A (en) * | 2017-01-20 | 2017-05-10 | 深圳市中移联半导体科技有限公司 | Loudspeaker direct voltage detection circuit |
| CN110213693A (en) * | 2019-07-08 | 2019-09-06 | 辽宁科技大学 | A kind of intelligent video speaker |
| CN113079438A (en) * | 2020-01-06 | 2021-07-06 | 北京小米移动软件有限公司 | Loudspeaker protection method, loudspeaker protection device and storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090219089A1 (en) * | 2005-07-26 | 2009-09-03 | Mauro Afonso Perez | Amplifier arrangement and method |
| CN201374809Y (en) * | 2009-01-05 | 2009-12-30 | 深圳市同洲电子股份有限公司 | Loudspeaker protective device and mobile communication terminal |
| CN201383865Y (en) * | 2009-02-14 | 2010-01-13 | 中山市捷丰达电子电器有限公司 | High-power switching power supply MOSFET audio power amplifier |
| CN201490975U (en) * | 2009-05-14 | 2010-05-26 | 广州飞达音响专业器材有限公司 | Digital power amplifier |
| CN202026279U (en) * | 2011-04-20 | 2011-11-02 | 山东浪潮金融信息系统有限公司 | Inquiry machine with wide voltage isolation audio power amplifier |
-
2011
- 2011-11-23 CN CN2011103756604A patent/CN102420572A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090219089A1 (en) * | 2005-07-26 | 2009-09-03 | Mauro Afonso Perez | Amplifier arrangement and method |
| CN201374809Y (en) * | 2009-01-05 | 2009-12-30 | 深圳市同洲电子股份有限公司 | Loudspeaker protective device and mobile communication terminal |
| CN201383865Y (en) * | 2009-02-14 | 2010-01-13 | 中山市捷丰达电子电器有限公司 | High-power switching power supply MOSFET audio power amplifier |
| CN201490975U (en) * | 2009-05-14 | 2010-05-26 | 广州飞达音响专业器材有限公司 | Digital power amplifier |
| CN202026279U (en) * | 2011-04-20 | 2011-11-02 | 山东浪潮金融信息系统有限公司 | Inquiry machine with wide voltage isolation audio power amplifier |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694506A (en) * | 2012-06-06 | 2012-09-26 | 国光电器股份有限公司 | Audio-frequency amplifier system powered based on power supply of computer USB (Universal Serial Bus) power source and integration of USB audio card |
| CN102752689A (en) * | 2012-06-28 | 2012-10-24 | 惠州市德赛视听科技有限公司 | Audio power amplifier output gain control device and control method thereof |
| CN106658295A (en) * | 2017-01-20 | 2017-05-10 | 深圳市中移联半导体科技有限公司 | Loudspeaker direct voltage detection circuit |
| CN110213693A (en) * | 2019-07-08 | 2019-09-06 | 辽宁科技大学 | A kind of intelligent video speaker |
| CN110213693B (en) * | 2019-07-08 | 2024-04-09 | 辽宁科技大学 | Intelligent video sound box |
| CN113079438A (en) * | 2020-01-06 | 2021-07-06 | 北京小米移动软件有限公司 | Loudspeaker protection method, loudspeaker protection device and storage medium |
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Application publication date: 20120418 |