CN211321491U - Circuit for eliminating power-down noise of audio equipment - Google Patents
Circuit for eliminating power-down noise of audio equipment Download PDFInfo
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- CN211321491U CN211321491U CN201922391043.8U CN201922391043U CN211321491U CN 211321491 U CN211321491 U CN 211321491U CN 201922391043 U CN201922391043 U CN 201922391043U CN 211321491 U CN211321491 U CN 211321491U
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- 238000001514 detection method Methods 0.000 claims description 7
- 230000000087 stabilizing effect Effects 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000003321 amplification Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 210000003454 tympanic membrane Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000000697 sensory organ Anatomy 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Abstract
The utility model relates to the technical field of electronic circuits, in particular to a circuit for eliminating power-down noise of audio equipment, which comprises a power supply, a microprocessor MCU and a power amplifier output end, wherein a time sequence control circuit is arranged between the microprocessor MCU and the power amplifier output end; the timing control circuit comprises a voltage division circuit, a triode Q1 and a triode Q2, one end of the voltage division circuit is connected with a power supply, the other end of the voltage division circuit is connected with a triode Q1, the triode Q1 is connected with a triode Q2, and the triode Q2 is simultaneously connected with a microprocessor MCU and a power amplifier output end; the microprocessor MCU is connected with the output end of the power amplifier; the utility model discloses can solve the audio equipment and fall the problem of electric noise, have circuit structure simple and advantage with low costs.
Description
Technical Field
The utility model relates to an electronic circuit technical field especially relates to a circuit of audio equipment power down noise is eliminated.
Background
With the development of science and technology, people seek high-quality life more and more, and the requirement for audio and video playing in life is higher and higher.
Most audio devices in the industry currently have a loud noise (POP) generated when the power supply is turned off. The POP sound, also called dc impact sound, refers to transient impact caused by various operations of an audio device at the moment of power-on and power-off and after power-on is stable. The impact of the POP sound impacts the eardrum of the person, affects the comfort of the sense organ, and even damages the eardrum when the impact is serious. In addition, the impact of POP sound also impacts the sound membrane of the speaker, which affects the output sound quality and shortens the life of the speaker.
Although the circuit for eliminating POP sound in the prior art can achieve the expected effect, the cost performance is not high, and the circuit is complex, has multiple components and parts, is high in cost and the like.
SUMMERY OF THE UTILITY MODEL
To the technical problem, the utility model provides an eliminate audio equipment and fall circuit of electric noise can solve the audio equipment and fall the problem of produced POP sound, has circuit structure simple and advantage with low costs.
In order to solve the technical problem, the utility model provides a concrete scheme as follows:
a circuit for eliminating power-down noise of audio equipment comprises a power supply, a microprocessor MCU and a power amplifier output end, wherein a time sequence control circuit is arranged between the microprocessor MCU and the power amplifier output end; the time sequence control circuit comprises a voltage division circuit, a triode Q1 and a triode Q2, one end of the voltage division circuit is connected with the power supply, the other end of the voltage division circuit is connected with the triode Q1, the triode Q1 is connected with the triode Q2, and the triode Q2 is simultaneously connected with the microprocessor MCU and the power amplifier output end; and the microprocessor MCU is connected with the power amplifier output end.
Optionally, a resistor R2 is connected between the voltage divider circuit and the transistor Q1; and a voltage stabilizing diode ZD1 is connected between the voltage dividing circuit and the power supply, and the voltage stabilizing diode ZD1 improves the detection speed of PVDD voltage fluctuation tracking, so that the power failure detection response speed of the time sequence control circuit is higher.
Optionally, the voltage divider circuit includes a resistor R1 and a resistor R3; one end of the resistor R1 is connected with the power supply, and the other end of the resistor R1 is simultaneously connected with the triode Q1 and the resistor R3; and the other end of the resistor R3 is grounded.
After the AC power fails, the voltage value of a power supply distributed to the triode Q1 through the voltage dividing circuit is also reduced, when the voltage value is reduced to a set threshold value, the C electrode (collector) and the E electrode (emitter) of the triode Q1 are cut off, the C electrode (collector) and the E electrode (emitter) of the triode Q2 are conducted, the level of an output end MUTE port of the power amplifier is forcibly reduced, meanwhile, the microprocessor MCU is informed to shut down, and POP sound caused by the fact that a preceding stage or the power amplifier output end is incorrect in power failure time sequence due to the fact that the AC power is lost can be solved.
Optionally, the base of the transistor Q1 is connected to the resistor R2, the collector of the transistor Q1 is connected to the transistor Q2, and the emitter of the transistor Q1 is grounded; the collector of the triode Q1 is also connected with a resistor R4.
The transistor Q1 is an NPN-type transistor, and functions as a current amplifier and a switch in the circuit.
Optionally, a collector of the triode Q2 is connected to the microprocessor MCU and the power amplifier output terminal at the same time to transmit a power failure detection signal to the processor MCU, and an emitter of the triode Q2 is grounded; the collector of the triode Q2 is also connected with a resistor R5, and a capacitor C1 is connected between the collector and the emitter of the triode Q2.
The transistor Q2 is an NPN-type transistor, and functions as a current amplifier and a switch in the circuit.
Optionally, microprocessor MCU is connected with the audio processor, the audio processor is connected with the audio input, uses this circuit of audio equipment power failure POP sound of eliminating in the audio circuit, can effectively solve the POP sound in the audio circuit.
Optionally, the power amplifier output end includes a power amplifier chip and a loudspeaker connected with the power amplifier chip, and the loudspeaker plays the audio frequency after power amplification.
Compared with the prior art, the beneficial effects of the utility model reside in that: the utility model discloses can solve the problem that audio equipment falls the electricity POP sound, have circuit structure simple and advantage with low costs.
Drawings
Fig. 1 is a circuit diagram of an audio device power-down noise elimination circuit provided in an embodiment of the present invention.
Detailed Description
In order to explain the technical solution of the present invention in detail, the following will combine the drawings of the embodiments of the present invention to perform clear and complete description on the technical solution of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.
In some embodiments, as shown in fig. 1, a circuit for eliminating power-down noise of an audio device is provided, which includes a system 10 having a power supply PVDD, a microprocessor MCU and a power amplifier output terminal 11, wherein a timing control circuit 12 is disposed between the microprocessor MCU and the power amplifier output terminal 11; the timing control circuit 12 comprises a voltage division circuit 121, a triode Q1 and a triode Q2, wherein one end of the voltage division circuit 121 is connected with a power supply PVDD, the other end of the voltage division circuit 121 is connected with a triode Q1, the triode Q1 is connected with a triode Q2, and the triode Q2 is simultaneously connected with a microprocessor MCU and a power amplifier output end 11; the microprocessor MCU is connected with the power amplifier output end 11.
Specifically, in practical application, after the AC power fails, the voltage value of the power supply PVDD distributed to the triode Q1 through the voltage divider circuit 121 is also reduced, when the voltage value is reduced to a set threshold value, the C electrode (collector) and the E electrode (emitter) of the triode Q1 are cut off, the C electrode (collector) and the E electrode (emitter) of the triode Q2 are turned on, the level of the Mute port of the power amplifier output end is forcibly pulled down, and meanwhile, the microprocessor MCU is notified to perform shutdown operation, so that NOISE (POP NOISE) caused by incorrect power failure timing of the preceding stage or the power amplifier output end due to the AC power failure can be solved.
In some embodiments, a resistor R2 is connected between the voltage divider 121 and the transistor Q1; a voltage stabilizing diode ZD1 is connected between the voltage dividing circuit 121 and the power supply PVDD, and the voltage stabilizing diode ZD1 improves the detection speed of voltage fluctuation tracking of the PVDD, so that the power failure detection response speed of the time sequence control circuit is higher.
The voltage divider circuit 121 includes a resistor R1 and a resistor R3; one end of the resistor R1 is connected with a power supply PVDD, and the other end of the resistor R1 is simultaneously connected with the triode Q1 and the resistor R3; the other end of the resistor R3 is connected to ground.
The base electrode of the triode Q1 is connected with the resistor R2, the collector electrode of the triode Q1 is connected with the triode Q2, and the emitter electrode of the triode Q1 is grounded; the collector of the transistor Q1 is also connected with a resistor R4.
The base electrode of the triode Q2 is connected with the triode Q1, the collector electrode of the triode Q2 is simultaneously connected with the microprocessor MCU and the power amplifier output end 11, and the emitter electrode of the triode Q2 is grounded; the collector of the triode Q2 is also connected with a resistor R5, and a capacitor C1 is connected between the collector and the emitter of the triode Q2.
In this example, the transistor Q1 and the transistor Q2 are NPN transistors that function as current amplifiers and switches in the circuit.
Referring to fig. 1, when the AC power of the system 10 is powered down, the voltage of the power supply PVDD decreases, and when the voltage of the power supply PVDD decreases to a set threshold, the C electrode (collector) and the E electrode (emitter) of the transistor Q1 are turned off, and at this time, the C electrode (collector) and the E electrode (emitter) of the transistor Q2 are turned on, and the AMP _ Mute is forcibly pulled down, so that the Mute power amplifier can be forcibly activated, and meanwhile, a power down detection signal is transmitted to notify the microprocessor MCU to send a power amplifier Mute control signal to the audio power amplifier to perform a shutdown operation, so that POP sound caused by incorrect power down timing of the preceding stage or the power amplifier output terminal 11 due to the AC power down can be solved.
The power down trigger threshold for AMP _ Mute may also be adjustable, in this example, by adjusting the parameters of zener diode ZD1, resistor R1, and resistor R3.
The power-down trigger threshold of AMP _ Mute may be selected by testing the lowest voltage of the power supply PVDD under the maximum dynamic power operating condition of the system 10, and setting the AMP _ Mute trigger threshold voltage with reference to 80% of the lowest voltage.
In some embodiments, the microprocessor MCU is connected to a sound processor 13, the sound processor 13 is connected to an audio input terminal 14, the audio input terminal 14 can be implemented by AUX interface, WIFI, BT fiber or HDMI, and the circuit for eliminating the power-down POP of the audio device is applied to an audio circuit, so as to effectively solve the POP in the audio circuit.
The power amplifier output end 11 comprises a power amplifier chip and a loudspeaker 111 connected with the power amplifier chip, and the loudspeaker plays the audio frequency after power amplification.
The foregoing is merely illustrative and explanatory of the structure of the present invention, which is described in more detail and with greater particularity, and is not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, many variations and modifications are possible without departing from the inventive concept, and such obvious alternatives fall within the scope of the invention.
Claims (7)
1. A circuit for eliminating power-down noise of audio equipment is characterized by comprising a power supply, a microprocessor MCU and a power amplifier output end, wherein a time sequence control circuit is arranged between the microprocessor MCU and the power amplifier output end;
the time sequence control circuit comprises a voltage division circuit, a triode Q1 and a triode Q2, one end of the voltage division circuit is connected with the power supply, the other end of the voltage division circuit is connected with the triode Q1, the triode Q1 is connected with the triode Q2, and the triode Q2 is simultaneously connected with the MCU and the power amplifier output end; and
and the microprocessor MCU is connected with the output end of the power amplifier.
2. The circuit for eliminating power-down noise of an audio device as claimed in claim 1, wherein a resistor R2 is connected between the voltage divider circuit and the transistor Q1; and
and a voltage stabilizing diode ZD1 is connected between the voltage dividing circuit and the power supply.
3. The circuit for eliminating power-down noise of an audio device as claimed in claim 1, wherein the voltage divider circuit comprises a resistor R1 and a resistor R3;
one end of the resistor R1 is connected with the power supply, and the other end of the resistor R1 is simultaneously connected with the triode Q1 and the resistor R3; and
the other end of the resistor R3 is grounded.
4. The circuit for eliminating power-down noise of an audio device as claimed in claim 2, wherein a base of the transistor Q1 is connected to the resistor R2, a collector of the transistor Q1 is connected to the transistor Q2, and an emitter of the transistor Q1 is grounded;
the collector of the triode Q1 is also connected with a resistor R4.
5. The circuit for eliminating power-down noise of an audio device according to claim 1, wherein a base electrode of the transistor Q2 is connected to the transistor Q1, a collector electrode of the transistor Q2 is connected to both the microprocessor MCU and the power amplifier output terminal to transmit a power-down detection signal to the processor MCU, and an emitter electrode of the transistor Q2 is grounded;
the collector of the triode Q2 is also connected with a resistor R5, and a capacitor C1 is connected between the collector and the emitter of the triode Q2.
6. The circuit for eliminating the power-down noise of the audio equipment according to any one of claims 1 to 5, wherein the microprocessor MCU is connected with an audio processor, and the audio processor is connected with an audio input end and the power amplifier output end.
7. The circuit for eliminating power-down noise of audio equipment according to claim 6, wherein said power amplifier output terminal comprises a power amplifier chip and a speaker connected to the power amplifier chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922391043.8U CN211321491U (en) | 2019-12-27 | 2019-12-27 | Circuit for eliminating power-down noise of audio equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922391043.8U CN211321491U (en) | 2019-12-27 | 2019-12-27 | Circuit for eliminating power-down noise of audio equipment |
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| Publication Number | Publication Date |
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| CN211321491U true CN211321491U (en) | 2020-08-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922391043.8U Expired - Fee Related CN211321491U (en) | 2019-12-27 | 2019-12-27 | Circuit for eliminating power-down noise of audio equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112954546A (en) * | 2021-02-01 | 2021-06-11 | 广州朗国电子科技有限公司 | Control circuit, module and terminal equipment for removing plosive by electrifying and powering off |
-
2019
- 2019-12-27 CN CN201922391043.8U patent/CN211321491U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112954546A (en) * | 2021-02-01 | 2021-06-11 | 广州朗国电子科技有限公司 | Control circuit, module and terminal equipment for removing plosive by electrifying and powering off |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200818 Address after: 523300 Liu Wu Road section of the three horizontal road in the new city of Shijie Town, Dongguan, Guangdong Patentee after: TYMPHANY HK LTD. Address before: No.27 Dayuan Road, Zhangcun village, Dongcheng Street, Dongguan City, Guangdong Province Patentee before: Dongguan Dongcheng Di FeNi electroacoustic technology Co.,Ltd. |
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| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200821 |
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| CF01 | Termination of patent right due to non-payment of annual fee |