CN106454630B - Power control circuit based on audio amplifier output - Google Patents
Power control circuit based on audio amplifier output Download PDFInfo
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- CN106454630B CN106454630B CN201610821421.XA CN201610821421A CN106454630B CN 106454630 B CN106454630 B CN 106454630B CN 201610821421 A CN201610821421 A CN 201610821421A CN 106454630 B CN106454630 B CN 106454630B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
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- Acoustics & Sound (AREA)
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Abstract
The invention belongs to the technical field of sound box control circuits, and particularly relates to a power control circuit based on sound box output. In the embodiment of the invention, the feedback loop is arranged between the loudspeaker and the second operational amplifier based on the power control circuit output by the sound box, so that the final output power is kept constant no matter high-frequency or low-frequency signals are output, the sound quality of the sound box system is ensured, and the distortion is effectively controlled.
Description
Technical Field
The invention belongs to the technical field of sound box control circuits, and particularly relates to a power control circuit based on sound box output.
Background
A speaker refers to a device that can convert an audio signal into sound. The popular way is that a power amplifier is arranged in a main box body or a bass box body of the sound box, and the sound is emitted back by the sound box after the audio signal is amplified, so that the sound is increased.
The existing sound box product design is directly connected to a loudspeaker after being output by an analog power amplifier or a digital power amplifier. No further power design control is done. Therefore, when the input signal is too large, the speaker system has a problem in that distortion is serious.
Disclosure of Invention
The embodiment of the invention aims to provide a power control circuit based on sound box output, and aims to solve the problem that a sound box system has serious distortion when an input signal is overlarge.
The embodiment of the invention is realized in such a way that the power control circuit based on the output of the sound box comprises a Bluetooth chip, a first operational amplifier, a second operational amplifier, a power amplifier and a loudspeaker which are sequentially connected, the power control circuit based on the output of the sound box further comprises a feedback loop connected between the loudspeaker and the second operational amplifier, and the feedback loop comprises a rectifying module, a first feedback module and a second feedback module which are sequentially connected between the loudspeaker and the second operational amplifier.
In the above structure, the rectifying module includes a diode D4 and a diode D5, anodes of the diode D4 and the diode D5 are respectively connected to the horn, and cathodes of the diode D4 and the diode D5 are connected to the first feedback module.
In the foregoing structure, the first feedback module includes:
the circuit comprises a chip U3, a resistor R61, a resistor R66, a resistor R67, a resistor R68, a resistor R69, a resistor R71, a resistor R73, a capacitor C77, a capacitor C79, a capacitor C81, a capacitor C84 and a triode Q3;
the first negative input terminal 1 IN-of the chip U3 is connected to the cathode of the diode D5 through a resistor R66, the resistor R61 is connected between the first negative input terminal 1 IN-of the chip U3 and ground, the first positive input terminal 1IN + of the chip U3 is connected to the power supply DC _ PA through a resistor R69 and a resistor R68 connected IN series, the capacitor C77, the resistor R71 and the capacitor C79 are connected IN parallel between the first positive input terminal 1IN + of the chip U3 and the ground, the first output terminal 1OUT of the chip U3 is connected to the base of the transistor Q3 through the resistor R67, the resistor R73 and the capacitor C81 are connected in parallel between a power supply terminal VDD of the chip U3 and a base electrode of the triode Q3, the capacitor C84 is connected between the power supply terminal VDD of the chip U3 and ground, the emitter of the transistor Q3 is connected to the power supply terminal VDD of the chip U3, and the collector of the transistor Q3 is connected to the second feedback module.
IN the above structure, the second feedback module includes a chip U8, two input terminals IN of the chip U8 are connected to the collector of the transistor Q3, and two output terminals OUT of the chip U8 are connected to the second operational amplifier.
In the embodiment of the invention, the feedback loop is arranged between the loudspeaker and the second operational amplifier based on the power control circuit output by the sound box, so that the final output power is kept constant no matter high-frequency or low-frequency signals are output, the sound quality of the sound box system is ensured, and the distortion is effectively controlled.
Drawings
Fig. 1 is a block diagram of a power control circuit based on speaker output according to an embodiment of the present invention;
fig. 2 is a circuit structure diagram of a power control circuit based on speaker output according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 shows a module structure of a power control circuit based on speaker output according to an embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown.
The utility model provides a power control circuit based on audio amplifier output, includes that bluetooth chip 1, first fortune that connect gradually put 2, second fortune and put 3, power amplifier 4 and loudspeaker 5, power control circuit based on audio amplifier output is still including connecting feedback loop between 3 is put to loudspeaker 5 and second fortune, feedback loop is including connecting gradually rectifier module 6, first feedback module 7 and second feedback module 8 between 3 are put to loudspeaker 5 and second fortune.
Fig. 2 shows a circuit structure of a power control circuit based on speaker output according to an embodiment of the present invention, and only the relevant portions of the power control circuit according to the embodiment of the present invention are shown for convenience of description.
As an embodiment of the present invention, the rectifying module 6 includes a diode D4 and a diode D5, anodes of the diode D4 and the diode D5 are respectively connected to the horn 5, and cathodes of the diode D4 and the diode D5 are connected to the first feedback module 7.
As an embodiment of the present invention, the first feedback module 7 includes:
the circuit comprises a chip U3, a resistor R61, a resistor R66, a resistor R67, a resistor R68, a resistor R69, a resistor R71, a resistor R73, a capacitor C77, a capacitor C79, a capacitor C81, a capacitor C84 and a triode Q3;
the first negative input terminal 1 IN-of the chip U3 is connected to the cathode of the diode D5 through a resistor R66, the resistor R61 is connected between the first negative input terminal 1 IN-of the chip U3 and ground, the first positive input terminal 1IN + of the chip U3 is connected to the power supply DC _ PA through a resistor R69 and a resistor R68 connected IN series, the capacitor C77, the resistor R71 and the capacitor C79 are connected IN parallel between the first positive input terminal 1IN + of the chip U3 and the ground, the first output terminal 1OUT of the chip U3 is connected to the base of the transistor Q3 through the resistor R67, the resistor R73 and the capacitor C81 are connected in parallel between a power supply terminal VDD of the chip U3 and a base electrode of the triode Q3, the capacitor C84 is connected between the power supply terminal VDD of the chip U3 and ground, the emitter of the transistor Q3 is connected to the power supply terminal VDD of the chip U3, and the collector of the transistor Q3 is connected to the second feedback module 8.
As an embodiment of the present invention, the second feedback module 8 includes a chip U8, two input terminals IN of the chip U8 are connected to the collector of the transistor Q3, and two output terminals OUT of the chip U8 are connected to the second operational amplifier 3.
The working principle is as follows:
SPK _ P and SPK _ N are output by a loudspeaker 5 of the sound box, are rectified through D4 and D5 of the rectifying module 6, and are calculated through input control resistors R61 and R66 to obtain a normal value A. The reference voltage of the chip U3 of the first feedback module 7 is calculated through the resistors R68, R69, and R71 to obtain the reference value C.
When A < C, the triode Q3 is cut off, the SATT _ BIAS signal is low voltage, the second feedback module 8 comprises a chip U8 which is closed, and the input of the power amplifier is the input of the sound box system.
When A > C (indicating that the system output power is too high), the triode Q3 is conducted, the SATT _ BIAS signal is high voltage, the second feedback module 8 is started, the limiting signal is output to the output of the second operational amplifier 3, namely AMP _ R _ PIN and AMP _ R _ NIN, the 2 signals are changed into normal signals at the moment and are output to the power amplifier 4, and finally the output power is recovered to the normal power.
In the embodiment of the invention, the feedback loop is arranged between the loudspeaker and the second operational amplifier based on the power control circuit output by the sound box, so that the final output power is kept constant no matter high-frequency or low-frequency signals are output, the sound quality of the sound box system is ensured, and the distortion is effectively controlled.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (2)
1. A power control circuit based on sound box output comprises a Bluetooth chip, a first operational amplifier, a second operational amplifier, a power amplifier and a loudspeaker which are sequentially connected, and is characterized in that the power control circuit based on sound box output also comprises a feedback loop connected between the loudspeaker and the second operational amplifier, wherein the feedback loop comprises a rectifying module, a first feedback module and a second feedback module which are sequentially connected between the loudspeaker and the second operational amplifier;
the rectifying module comprises a diode D4 and a diode D5, anodes of the diode D4 and the diode D5 are respectively connected with the horn, and cathodes of the diode D4 and the diode D5 are connected with the first feedback module;
the first feedback module comprises: the circuit comprises a chip U3, a resistor R61, a resistor R66, a resistor R67, a resistor R68, a resistor R69, a resistor R71, a resistor R73, a capacitor C77, a capacitor C79, a capacitor C81, a capacitor C84 and a triode Q3; a first negative input terminal 1 IN-of the chip U3 is connected to the cathode of the diode D5 and the cathode of the diode D4 through a resistor R66, the resistor R61 is connected between the first negative input terminal 1 IN-of the chip U3 and the ground, a first positive input terminal 1IN + of the chip U3 is connected to the power supply DC _ PA through a resistor R69 and a resistor R68 which are connected IN series, the capacitor C77, a resistor R71 and a capacitor C79 are connected IN parallel between the first positive input terminal 1IN + of the chip U3 and the ground, a first output terminal 1OUT of the chip U3 is connected to the base of the transistor Q3 through the resistor R67, the resistor R73 and the capacitor C81 are connected IN parallel between the power supply terminal of the chip U3 and the base of the transistor VDD Q3, the capacitor C84 is connected between the power supply terminal of the chip U3 and the ground, the emitter of the transistor Q3 is connected to the power supply terminal VDD of the chip U3, the collector of the triode Q3 is connected with the second feedback module.
2. The speaker output-based power control circuit as claimed IN claim 1, wherein the second feedback module comprises a chip U8, two input terminals IN of the chip U8 are connected to the collector of the transistor Q3, and two output terminals OUT of the chip U8 are connected to the second operational amplifier;
when the transistor Q3 is cut off, the collector of the transistor Q3 outputs low voltage, and the chip U8 is turned off;
when the transistor Q3 is turned on, the collector of the transistor Q3 outputs a high voltage, the chip U8 is turned on, and the chip U8 outputs a limiting signal to the second operational amplifier.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610821421.XA CN106454630B (en) | 2016-09-12 | 2016-09-12 | Power control circuit based on audio amplifier output |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610821421.XA CN106454630B (en) | 2016-09-12 | 2016-09-12 | Power control circuit based on audio amplifier output |
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| CN106454630A CN106454630A (en) | 2017-02-22 |
| CN106454630B true CN106454630B (en) | 2021-01-19 |
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| CN201610821421.XA Active CN106454630B (en) | 2016-09-12 | 2016-09-12 | Power control circuit based on audio amplifier output |
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| CN107155156A (en) * | 2017-07-04 | 2017-09-12 | 哈尔滨固泰电子有限责任公司 | Diode makees the electric horn and control method of inductance coil induced electromotive force absorption |
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| CN103475977A (en) * | 2013-09-10 | 2013-12-25 | 昆山新金福精密电子有限公司 | Audio signal circuit |
| CN204031079U (en) * | 2014-08-07 | 2014-12-17 | 深圳供电局有限公司 | A kind of signal amplifies and power amplification circuit |
| CN204559865U (en) * | 2015-05-15 | 2015-08-12 | 杭州纳雄科技有限公司 | A kind of head circuit |
| CN105101006A (en) * | 2014-05-13 | 2015-11-25 | 深圳Tcl新技术有限公司 | Wireless microphone and wireless karaoke control system |
| CN204906683U (en) * | 2015-07-29 | 2015-12-23 | 合肥赛为智能有限公司 | Microphone suppression circuit that utters long and high -pitched sounds in intercom system |
| CN105489211A (en) * | 2014-10-06 | 2016-04-13 | 斯沃奇集团研究和开发有限公司 | Electronic device for generating a warning sound or music |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8224009B2 (en) * | 2007-03-02 | 2012-07-17 | Bose Corporation | Audio system with synthesized positive impedance |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475977A (en) * | 2013-09-10 | 2013-12-25 | 昆山新金福精密电子有限公司 | Audio signal circuit |
| CN105101006A (en) * | 2014-05-13 | 2015-11-25 | 深圳Tcl新技术有限公司 | Wireless microphone and wireless karaoke control system |
| CN204031079U (en) * | 2014-08-07 | 2014-12-17 | 深圳供电局有限公司 | A kind of signal amplifies and power amplification circuit |
| CN105489211A (en) * | 2014-10-06 | 2016-04-13 | 斯沃奇集团研究和开发有限公司 | Electronic device for generating a warning sound or music |
| CN204559865U (en) * | 2015-05-15 | 2015-08-12 | 杭州纳雄科技有限公司 | A kind of head circuit |
| CN204906683U (en) * | 2015-07-29 | 2015-12-23 | 合肥赛为智能有限公司 | Microphone suppression circuit that utters long and high -pitched sounds in intercom system |
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| CN106454630A (en) | 2017-02-22 |
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