CN112866875B - Startup and shutdown anti-impact circuit for digital audio processor - Google Patents
Startup and shutdown anti-impact circuit for digital audio processor Download PDFInfo
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- CN112866875B CN112866875B CN202110047452.5A CN202110047452A CN112866875B CN 112866875 B CN112866875 B CN 112866875B CN 202110047452 A CN202110047452 A CN 202110047452A CN 112866875 B CN112866875 B CN 112866875B
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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
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
- H01H47/32—Energising current supplied by semiconductor device
Abstract
The invention discloses a startup and shutdown anti-impact circuit for a digital audio processor, which comprises a voltage sampling circuit and a startup and shutdown mute circuit, wherein the voltage sampling circuit is used for providing a sampling voltage for shutdown or startup, and the startup and shutdown mute circuit is used for carrying out corresponding processing according to the sampling voltage. When the MCU is started, the I/O delay time of the MCU can be accurately set, so that the relay is disconnected and has no output; when the device is turned off, 220V is turned off quickly, and the sampling voltage disappears quickly, so that the relay is turned off and has no output, and the startup and shutdown effect is achieved.
Description
Technical Field
The invention relates to the field of audio, in particular to a power-on and power-off anti-impact circuit for a digital audio processor.
Background
When a user starts up and shuts down the audio processor, noise is generated inside the power supply during the transient state transition period of the power supply to the steady state, and the noise is output through the amplifying circuit, so that the loudspeaker emits an inaudible explosion sound, the loudspeaker is damaged, and even a hearing system of human ears is damaged.
In the prior art, most of the on-off mute circuits applied to the audio processor at present do not use a switching power supply, the circuit is powered by the switching power supply, the national energy-saving and environment-friendly policy is met, and the circuit is simple and easy to realize.
Disclosure of Invention
The invention aims to solve the technical problem that an audio circuit is easy to generate explosive sound when an audio processor is turned on or turned off, and aims to provide a startup and shutdown anti-impact circuit for a digital audio processor, which solves the problem of explosive sound when the audio processor is started and shut down.
The invention is realized by the following technical scheme:
a power-on and power-off anti-impact circuit for a digital audio processor comprises a voltage sampling circuit and a power-on and power-off mute circuit which are connected with each other, wherein the voltage sampling circuit is used for providing sampling voltage for power-off or power-on, and the power-on and power-off mute circuit is used for carrying out corresponding processing according to the sampling voltage; the on-off mute circuit comprises a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a triode Q1, a triode Q2, a diode D3, an optical couple U2 and a switch element, wherein the optical couple U2 comprises four pins; the emitter of the triode Q1 is grounded, the base of the triode Q1 is connected with one end of the resistor R8, the other end of the resistor R8 is connected with an I/O interface of an MCU (microprogrammed control Unit) which is used for providing a mute signal, the collector of the triode Q1 is connected with one end of the resistor R7 and a second pin of the optical couple U2, and the other end of the resistor R7 is connected with a 3.3V power supply; a first pin of the optical couple U2 is connected with one end of a resistor R9, the other end of the resistor R9 is connected with the voltage sampling circuit, a fourth pin of the optical couple U2 is connected with one end of a resistor R11, the other end of the resistor R11 is connected with a VCC power supply, and a third pin of the optical couple U2 is connected with one end of a resistor R10; the base electrode of the triode Q2 is connected with the other end of the resistor R10, the emitter electrode of the triode Q2 is grounded, the collector electrode of the triode Q2 is connected with the anode of the diode D3, one end of the resistor R12 and one end of the switching element, and the other end of the switching element is connected with a VCC power supply; the cathode of the diode D3 and the other end of the resistor R12 are both connected to a VCC power supply.
In the prior art, a switching power supply is mostly not used in a switching mute circuit of an audio processor, the circuit is powered by the switching power supply and is respectively provided with a voltage sampling circuit and a switching mute circuit, the voltage sampling circuit is used for providing sampling voltage for starting and closing, the switching mute circuit carries out corresponding processing according to the sampled voltage, and during starting, the I/O delay time of an MCU (micro control unit) can be accurately set, so that a relay is not attracted, and no signal is output; when the device is turned off, 220V is turned off quickly, and the sampling voltage disappears quickly, so that the relay turn-off signal is not output, and the turn-on and turn-off effect is achieved. The invention accords with the national policy of energy conservation and environmental protection, and the circuit is simple and easy to realize.
For military sound equipment, the on-off blasting sound can not meet the characteristics of high standard, high requirement and high quality of the military industry except for generating sound for the equipment. The audio processor is provided with the voltage sampling circuit and the on-off mute circuit, so that the on-off effect of the sound equipment can be achieved without explosion sound, and the quality standard of the military industry is met.
Further, the voltage sampling circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a diode D1, a diode D2, a capacitor C1, a polarity capacitor E1, a zener diode ZD3 and an optical couple U1, wherein the optical couple U1 comprises four pins; one end of a capacitor C1 and one end of a resistor R1 are connected with a live wire of a mains supply, the other end of a resistor R1 is connected with one end of a resistor R2, the other end of the capacitor C1 is connected with the other end of a resistor R2, the anode of a diode D1 and the cathode of a diode D2, and the cathode of the diode D1 is connected with the anode of a polarity capacitor E1, one end of the resistor R3 and one end of a resistor R4; the other end of the resistor R3 is connected with the 1 st pin of the optical couple U1, and the other end of the resistor R4, the cathode of the polar capacitor E1, the 2 nd pin of the optical couple U1 and the anode of the diode D2 are connected with a mains supply zero line; the 3 rd pin of the optical couple U1 is connected with one end of a resistor R6, the other end of the resistor R6 is connected with the negative electrode of a voltage stabilizing diode ZD3 and the on-off mute circuit, the 4 th pin of the optical couple U1 is connected with one end of a resistor R5, the other end of the resistor R5 is connected with a VCC power supply, and the positive electrode of the voltage stabilizing diode ZD3 is grounded.
Furthermore, one end of the capacitor C1 and one end of the resistor R1 are connected to the live line of the utility power through the connection terminal JP 8.
Further, the switching element is a double-pole double-throw switch.
Further, the switching element is a relay RL1,
further, the relay RL1 includes two sets of normally closed contacts, which are respectively connected to the positive terminal and the negative terminal of the two audio outputs.
Compared with the prior art, the invention has the following advantages and beneficial effects:
when the MCU is started, the I/O delay time of the MCU can be accurately set, so that the relay is closed and disconnected without output; when the device is turned off, 220V is turned off quickly, and the sampling voltage disappears quickly, so that the relay is turned off and has no output, and the startup and shutdown effect is achieved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a diagram of a voltage sampling circuit;
fig. 2 is a diagram of an on/off mute circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Examples
The embodiment is a power-on and power-off anti-shock circuit for a digital audio processor, which comprises a voltage sampling circuit and a power-on and power-off mute circuit, wherein the voltage sampling circuit is used for providing a sampling voltage for power-off or power-on, and the voltage sampling circuit is shown in fig. 1. The power on/off mute circuit is used for performing corresponding processing according to the sampling voltage, and is shown in fig. 2.
The specific scheme is as follows:
input end VD 1: the sampling voltage is used for providing a shutdown or startup sampling voltage;
MCU: an input/output pin is arranged and provides a mute signal; the MCU is used for providing an original starting level signal for the startup and shutdown of the audio processor.
Optical coupler U2: the positive end of the light emitting diode is connected with the current limiting resistor R9 in series, and the negative end of the light emitting diode is connected with the I/O port of the MCU; the collector is connected with VCC in a pulling mode, and the emitter is connected with a resistor R10 to the base of the triode Q2 in a connecting mode;
NPN transistor Q2: the emitter is grounded, and the collector is connected with one electric shock end of the relay and is pulled up to VCC;
a relay: the relay is opened or closed, and no signal is output.
The principle of how the fast sample voltage is generated is illustrated in connection with fig. 1:
the live wire connects current-limiting resistor R1, R2, 1 foot to opto-coupler U1 through D1 rectification, 2 feet of opto-coupler connect the zero line, establish ties electric capacity C1 between live wire and the zero line, the collecting electrode R5 of opto-coupler U1 pulls up the VCC, the collecting electrode concatenates current-limiting resistor R6, another termination zener diode ZD 3's negative terminal of R6, ZD3 positive terminal ground connection, VCC is through ZD3 steady voltage output quick detection voltage VD 1. When the LED is started, the voltage difference of the optocoupler light-emitting diode exceeds the conduction voltage, the collector and the emitter of the optocoupler are conducted, and VD1 is output.
The principle of the mute on/off circuit will be explained with reference to fig. 2:
VD1 is connected in series with a current limiting resistor R9 to the positive end of a light emitting diode of an optocoupler U2, a signal output by I/O of the MCU is connected in series with a resistor R8 to the base electrode of a triode Q1, the emitter electrode of the triode Q1 is grounded, the collector electrode of Q1 is connected with the positive end of the light emitting diode of the optocoupler U2, and the triode Q1 is also connected with a resistor and pulled up to 3.3V; the collector of the optocoupler U2 is connected with R11, and the other end of R11 is pulled up to VCC; an emitter of the optocoupler U2 is connected with a resistor R10 in series to a base electrode of a triode Q2; the emitter of the triode Q2 is grounded, the collector of the Q2 is connected with the positive end of the diode D3, the negative end of the diode D3 is connected with VCC, the diode D3 is also connected with a resistor R12 in parallel, the emitter of the triode Q2 is also connected with one end of a relay RL1 coil, the other end of the relay RL1 coil is connected with VCC, and the positive ends and the negative ends of the two groups of coil signal output 1 and signal output 2 of the relay RL1 are connected.
When the power-on, the power is transition from the transient state to the steady state, MCU's I/O mouth output low level and time delay to the power stable, triode Q1 ends, opto-coupler U2 negative terminal is the high level, opto-coupler U2's emitting diode ends, opto-coupler U2's triode side ends, the collector output is the VCC, relay RL1 does not actuation, RL1 is the normally closed relay, because output 1 is the same for the range size respectively with output 2's positive terminal and negative terminal, the opposite phase place makes output 1 and output 2 offset completely, can not produce "POP" sound.
When the power supply is in a steady state, the I/O port of the MCU outputs a high level, the triode Q1 is connected, the negative end of the optocoupler U2 is a low level, the light emitting diode of the optocoupler U2 is connected, the triode side of the optocoupler U2 is connected, the output of the collector is low, the voltage drop at two ends of the RL coil of the relay is VCC, the RL1 of the relay is attracted, two ends of the RL1 contact of the relay are disconnected, and the machine normally outputs the output of the RL1 contact. The relay RL1 includes two sets of normally closed contacts that are connected to the positive and negative terminals of the two audio outputs, respectively.
When the shutdown, quick voltage disappears soon, and the positive end of opto-coupler U2 is the low level, and opto-coupler U2's emitting diode ends, and opto-coupler U2's triode side ends, and the collector output is the VCC, and relay RL1 coil release, contact both ends signal output offsets each other, also can not produce "POP" sound.
The embodiment is applied to the audio processor, and when the audio processor is turned on, the I/O delay time of the MCU can be accurately set, so that the relay is not attracted, and output signals are mutually offset; when the audio processor is closed, the 220V fast switch-off is carried out, the sampling voltage disappears fast, so that the output signals are mutually offset, and the effect of starting and shutting down is achieved.
The invention obtains the fast sampling voltage from the switch power supply, and the fast sampling voltage disappears when the power supply is shut down, thereby eliminating 'POP' sound, and the circuit has simple design and lower cost.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. A power-on and power-off anti-impact circuit for a digital audio processor is characterized by comprising a voltage sampling circuit and a power-on and power-off mute circuit which are mutually connected;
the on-off mute circuit comprises a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a triode Q1, a triode Q2, a diode D3, an optical couple U2 and a switch element, wherein the optical couple U2 comprises four pins;
the emitter of the triode Q1 is grounded, the base of the triode Q1 is connected with one end of the resistor R8, the other end of the resistor R8 is connected with an I/O interface of an MCU (microprogrammed control Unit) which is used for providing a mute signal, the collector of the triode Q1 is connected with one end of the resistor R7 and a second pin of the optical couple U2, and the other end of the resistor R7 is connected with a 3.3V power supply;
a first pin of the optical couple U2 is connected with one end of a resistor R9, the other end of the resistor R9 is connected with the voltage sampling circuit, a fourth pin of the optical couple U2 is connected with one end of a resistor R11, the other end of the resistor R11 is connected with a VCC power supply, and a third pin of the optical couple U2 is connected with one end of a resistor R10;
the base electrode of the triode Q2 is connected with the other end of the resistor R10, the emitter electrode of the triode Q2 is grounded, the collector electrode of the triode Q2 is connected with the anode of the diode D3, one end of the resistor R12 and one end of the switching element, and the other end of the switching element is connected with a VCC power supply;
the cathode of the diode D3 and the other end of the resistor R12 are both connected with a VCC power supply;
the switch element is a double-pole double-throw switch;
and the switch element comprises two groups of normally closed contacts which are respectively connected with the positive end and the negative end of the two audio outputs.
2. The power-on/off impact prevention circuit for the digital audio processor of claim 1, wherein the voltage sampling circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a diode D1, a diode D2, a capacitor C1, a polarity capacitor E1, a zener diode ZD3 and a photo couple U1, and the photo couple U1 comprises four pins;
one end of a capacitor C1 and one end of a resistor R1 are connected with a live wire of a mains supply, the other end of a resistor R1 is connected with one end of a resistor R2, the other end of the capacitor C1 is connected with the other end of a resistor R2, the anode of a diode D1 and the cathode of a diode D2, and the cathode of the diode D1 is connected with the anode of a polarity capacitor E1, one end of the resistor R3 and one end of a resistor R4;
the other end of the resistor R3 is connected with the 1 st pin of the optical couple U1, and the other end of the resistor R4, the cathode of the polar capacitor E1, the 2 nd pin of the optical couple U1 and the anode of the diode D2 are connected with a mains supply zero line;
the 3 rd pin of the optical couple U1 is connected with one end of a resistor R6, the other end of the resistor R6 is connected with the negative electrode of a voltage stabilizing diode ZD3 and the on-off mute circuit, the 4 th pin of the optical couple U1 is connected with one end of a resistor R5, the other end of the resistor R5 is connected with a VCC power supply, and the positive electrode of the voltage stabilizing diode ZD3 is grounded.
3. The power-on/off impact protection circuit for digital audio processor as claimed in claim 2, wherein one end of the capacitor C1 and one end of the resistor R1 are connected to the live line of the mains through the connection terminal JP 8.
4. The power-on/off impact protection circuit for a digital audio processor according to claim 1, wherein said switching element is a relay RL 1.
5. An on-off anti-shock system for a digital audio processor, the system comprising the on-off anti-shock circuit for a digital audio processor of any of claims 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110047452.5A CN112866875B (en) | 2021-01-14 | 2021-01-14 | Startup and shutdown anti-impact circuit for digital audio processor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110047452.5A CN112866875B (en) | 2021-01-14 | 2021-01-14 | Startup and shutdown anti-impact circuit for digital audio processor |
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| Publication Number | Publication Date |
|---|---|
| CN112866875A CN112866875A (en) | 2021-05-28 |
| CN112866875B true CN112866875B (en) | 2022-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110047452.5A Active CN112866875B (en) | 2021-01-14 | 2021-01-14 | Startup and shutdown anti-impact circuit for digital audio processor |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI444054B (en) * | 2009-06-03 | 2014-07-01 | Mstar Semiconductor Inc | De-pop controller and method |
| CN101945316B (en) * | 2010-08-11 | 2013-09-25 | 福建星网视易信息系统有限公司 | Startup and shutdown automatic mute circuit of embedded type audio-video equipment |
| CN202121292U (en) * | 2011-06-28 | 2012-01-18 | 青岛海信电器股份有限公司 | Power failure protective circuit and power supply circuit |
| CN203984360U (en) * | 2014-07-31 | 2014-12-03 | 深圳市雅迪威电子有限公司 | Transistor vehicle power amplifier circuit without impact sound generated in switching process |
| CN204732869U (en) * | 2015-07-22 | 2015-10-28 | 航天长峰朝阳电源有限公司 | A kind of high reliability overvoltage surge protective circuit |
| CN105929744A (en) * | 2016-06-08 | 2016-09-07 | 珠海格力电器股份有限公司 | Power on/off circuit and household electrical appliance |
| CN205945985U (en) * | 2016-07-02 | 2017-02-08 | 广东固锝电子科技有限公司 | Startup and shutdown muting circuit |
| CN206272830U (en) * | 2016-11-18 | 2017-06-20 | 广州视源电子科技股份有限公司 | Power down POP sound control circuits |
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