CN206993394U - Muting control circuit - Google Patents
Muting control circuit Download PDFInfo
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- CN206993394U CN206993394U CN201720839050.8U CN201720839050U CN206993394U CN 206993394 U CN206993394 U CN 206993394U CN 201720839050 U CN201720839050 U CN 201720839050U CN 206993394 U CN206993394 U CN 206993394U
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- current limiting
- switch pipe
- limiting device
- energy storage
- storage device
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Abstract
It the utility model is related to a kind of muting control circuit,Including the first current limiting device,Second current limiting device,First energy storage device,First switch pipe and second switch pipe,The input connection power access end of first switch pipe,The control terminal of first switch pipe connects one end of the first current limiting device,The other end of first current limiting device connects one end of the first energy storage device,The other end ground connection of first energy storage device,One end connection power access end of second current limiting device,The other end of second current limiting device connects the common port of the first current limiting device and the first energy storage device,The control terminal of the output end connection second switch pipe of first switch pipe,The output head grounding of second switch pipe,The input of second switch pipe is used to connect external power amplifier,Pass through switching tube,The combination of current limiting device and energy storage device,Using the time difference of the charging of energy storage device come the conducting of controlling switch pipe,The pulse voltage of booting moment can be eliminated,Reduce noise caused by start,Reach the purpose of Jing Yin control.
Description
Technical field
Mute circuit field is the utility model is related to, more particularly to a kind of muting control circuit.
Background technology
Now, with the growth in the living standard of people, increasing sound equipment is by people's extensive utilization.Power amplifier is as sound
A loud part, the development of high speed is obtained, power amplifier there are many kinds, but its general principle all communicates, the problem of generation
Also it is similar, such as noise caused by switching on and shutting down moment.In routine use, starting shooting or shutting down moment, mute function is bad
The sense of hearing that impact noise caused by power amplifier moment gives people brings poor experience.
Utility model content
Based on this, it is necessary to for caused by traditional power amplifier booting moment the problem of impact noise, there is provided it is a kind of effectively
Eliminate the muting control circuit of start-up noises.
A kind of muting control circuit, including the first current limiting device, the second current limiting device, the first energy storage device, first switch
Pipe and second switch pipe, the input connection power access end of the first switch pipe, the control terminal of the first switch pipe connect
One end of first current limiting device is connect, the other end of first current limiting device connects one end of first energy storage device,
The other end ground connection of first energy storage device, one end of second current limiting device connect the power access end, and described the
The other end of two current limiting devices connects the common port of first current limiting device and first energy storage device, the first switch
The output end of pipe connects the control terminal of the second switch pipe, the output head grounding of the second switch pipe, the second switch
The input of pipe is used to connect external power amplifier.
Above-mentioned muting control circuit is by the combination of switching tube, current limiting device and energy storage device, utilizes energy storage device
The time difference of charging carrys out the conducting of controlling switch pipe, can eliminate the pulse voltage of booting moment, is produced when reaching reduction start
Noise, so as to reach the purpose of Jing Yin control.
Brief description of the drawings
Fig. 1 is muting control circuit structure chart in an embodiment；
Fig. 2 is muting control circuit structure chart in another embodiment；
Fig. 3 is muting control circuit structure chart in another embodiment；
Fig. 4 is muting control circuit structural representation in an embodiment.
Embodiment
In one embodiment, as shown in figure 1, a kind of muting control circuit, including the first current limiting device 120, second limit
Flow device 140, the first energy storage device 130, first switch pipe 110 and second switch pipe 150, the input of first switch pipe 110
Power access end 200 is connected, the control terminal of first switch pipe 110 connects the first end of the first current limiting device 120, the first current limiter
Second end of part 120 connects the first end of the first energy storage device 130, the second end ground connection of the first energy storage device 130, the second current limliting
The first end connection power access end 200 of device 140, the second end of the second current limiting device 140 connects the first current limiting device 120
The common port of the first end of second end and the first energy storage device 130, the output end connection second switch pipe of first switch pipe 110
150 control terminal, the output head grounding of second switch pipe 150, the input of second switch pipe 150 are used to connect external power amplifier
300。
Specifically, in start, for the first energy storage device 130 equivalent to shorted to earth, power access end 200 exports 12V electricity
Pressure, according to the ON operation principle of switching tube, because the current limliting that the first current limiting device 120 and the second current limiting device 140 rise is made
With, the voltage (being less than 12V) of the control terminal of first switch pipe 110 is less than the voltage (12V) of the input of first switch pipe 110,
First switch pipe 110 is turned on, and first energy storage device 130 is charged by the first current limiting device 120, first switch pipe 110
Output end and the voltage of control terminal of second switch pipe 150 be 12V, the voltage of the control terminal of second switch pipe 150 is higher than the
The voltage of the output end of two switching tubes 150, second switch pipe 150 turn on, and the signal of external power amplifier 300 is eliminated start to ground
The pulse voltage of moment, reach noise caused by reduction start, so as to reach the purpose of Jing Yin control, when the first energy storage device
After 130 is fully charged, first switch pipe 110 and second switch pipe 150 are disconnected, and now audio signal is not influenceed, wherein, first
Current limiting device 120, the second current limiting device 140 and the first energy storage device 130 can determine the time of turn-on muting delay, can be according to tool
Body needs to be configured the value of the first current limiting device 120, the second current limiting device 140 and the first energy storage device 130.
In one embodiment, as shown in Fig. 2 muting control circuit also includes the first diode 160, the second diode
180 and second energy storage device 170, the input of first switch pipe 110 power access end 200 is connected by the first diode 160,
And first diode 160 anode connection power access end 200, the negative electrode connection first switch pipe 110 of the first diode 160
Input, the negative electrode of the second diode 180 connect the anode of the first diode 160, the anode connection first of the second diode 180
The common port of the first end of second end of current limiting device 120 and the first energy storage device 130, the first end of the second energy storage device 170
Connect the common port of the negative electrode of the first diode 160 and the input of first switch pipe 110, the second of the second energy storage device 170
End ground connection.
Specifically, on the basis of turn-on muting is realized, when shutdown, the electricity of the first energy storage device 130 passes through the two or two
Pole pipe 180 is discharged, and moment is low level, i.e., the control terminal of first switch pipe 110 is low level, because the second diode
180 be to be connected on power access end 200, and power access end 200 is connected to many loads, therefore discharge time is quickly, also, the one or two
160 reverse-biased cut-off of pole pipe, the second energy storage device 170 cause first switch pipe as the power access end 200 of first switch pipe 110
110 and second switch pipe 150 turn on again so that the signal ground of external power amplifier 300, eliminate the pulse voltage of shutdown moment,
Reach noise caused by reduction shutdown, so as to reach the purpose of Jing Yin control, wherein, the second energy storage device 170 determines shutdown
The time of Jing Yin delay, the value of the second energy storage device 170 can be configured according to specific needs.
In one embodiment, as shown in figure 3, muting control circuit also includes the 3rd current limiting device 190, first switch pipe
110 output end connects the control terminal of second switch pipe 150 by the 3rd current limiting device 190.
Specifically, the 3rd current limiting device 190 is used to prevent that the voltage for inputing to second switch pipe 150 is excessive, opens second
Close pipe 150 to cause damage, improve the safety and stability of muting control circuit.
In one embodiment, muting control circuit also includes the 3rd diode 192, and the anode of the 3rd diode 192 connects
Connect the 3rd current limiting device 190 the second end, the control terminal of the negative electrode connection second switch pipe 150 of the 3rd diode 192.
Specifically, the 3rd diode 192 is voltage-regulator diode, and the 3rd current limiting device 190 is together for preventing from inputing to
The voltage of second switch pipe 150 is excessive, and second switch pipe 150 is caused damage, and improves the security of muting control circuit and steady
It is qualitative.
In one embodiment, muting control circuit also includes the 4th current limiting device 194, and the of the 4th current limiting device 194
The output end of one end connection first switch pipe 110, the second end ground connection of the 4th current limiting device 194.
Specifically, the 4th current limiting device 194 is used to shunt, and can play a part of stable muting control circuit.
In another embodiment, muting control circuit also includes the 4th current limiting device 194, the 4th current limiting device 194
The output end of first end connection first switch pipe 110, the second end connection negative supply of the 4th current limiting device 194.
Specifically, the 4th current limiting device 194 can be grounded when single supply is powered, and negative voltage is connect in dual power supply, can be with
Play a part of stable muting control circuit, when first switch pipe 110 ends, because the 4th current limiting device 194 is only negative
Level, so the level of the control terminal of second switch pipe 150 is also negative level, it is lower than the output end voltage of second switch pipe 150, so as to
It is not turned on, realizes after Jing Yin delay on external power amplifier signal without influence.
In one embodiment, first switch pipe 110 is the first triode, and second switch pipe 150 is the second triode.
Specifically, the first triode is PNP triode, and the second triode is NPN triode.When the base stage of PNP triode
Voltage be less than emitter stage voltage when, PNP triode conducting, when NPN triode base stage voltage be more than emitter stage electricity
During pressure, NPN triode conducting.
In one embodiment, the first current limiting device 120 and the second current limiting device 140 are resistance.
Specifically, the resistance of the first current limiting device 120 is 10K, and the resistance of the second current limiting device 140 is 47K, further
Ground, the 3rd current limiting device 190 and the 4th current limiting device 194 are resistance, and the resistance of the 3rd current limiting device 190 is 1K, and the 4th limits
The resistance for flowing device 194 is 470K.
In one embodiment, the first energy storage device 130 is electrochemical capacitor.
Specifically, the first energy storage device 130 is 47uf/16V electrochemical capacitors, and further, the second energy storage device 170 is
220uf/16V electrochemical capacitors.
In one embodiment, the first diode 160 is IN4007 diodes, and the second diode 180 is the poles of IN4148 bis-
Pipe, the 3rd diode 192 is IN4148 diodes.
In one more detailed embodiment, as shown in figure 4, muting control circuit includes the first diode D33, second
Diode D29, the 3rd diode D30, the first triode Q5, the second triode Q02, first resistor R307, second resistance R306,
3rd resistor R308, the 4th resistance R305, the first electric capacity CE304 and the second electric capacity CE305, the first diode D33 anode connect
Power access end 200 is connect, the first diode D33 negative electrode connects the first triode Q5 emitter stage, the first triode Q5 base
Pole connection first resistor R307 first end, first resistor R307 the first electric capacity CE304 of the second end connection first end, first
Electric capacity CE304 the second end ground connection, the second electric capacity CE305 first end connect the first triode Q5 emitter stage, the second electric capacity
CE305 the second end ground connection, the second diode D29 anode connection first resistor R307 the second end and the first electric capacity CE304
First end common port, the second diode D29 negative electrode connects the first diode D33 anode, the of second resistance R306
One end connects the first diode D33 anode, second resistance R306 the second end connection first resistor R307 the second end and the
The common port of one electric capacity CE304 first end, the first triode Q5 colelctor electrode connection 3rd resistor R308 first end, the 3rd
Resistance R308 the second end connects the 3rd diode D30 anode, and the 3rd diode D30 negative electrode connects the second triode Q02
Base stage, the second triode Q02 grounded emitter, the second triode Q02 colelctor electrode connection external power amplifier 300, specifically,
By port OUT connections external power amplifier 300, the 4th resistance R305 first end connects the first triode Q5 colelctor electrode, and the 4th
Resistance R305 the second end ground connection or connection negative supply.
Specifically, in start, CE304 electrochemical capacitors are equivalent to shorted to earth, Q5 conductings, because resistance R306 is very big,
CE304 mainly charges by D33, R307, because base stage turns on for low level, high level makes Q5 by R308 and D30
Q02 conductings, making OUT signal shorts, so as to realize turn-on muting, after CE304 is fully charged, Q5, Q02 end to ground,
Now audio signal is not influenceed, wherein R306, R307 and CE304 determine the time of turn-on muting delay.
During shutdown CE304 electricity by D29 carry out discharge moment be low level because D29 is connected on power access end 200,
There are many loads, discharge time, the reverse-biased cut-offs of D33, Q5 base stages were low level quickly, and now CE305 causes as Q05 power supply
Q5 and Q02 are turned on again, are grounded audio signal in time, so as to realize that shutdown is Jing Yin, wherein, CE305 determines that shutdown is Jing Yin and prolonged
When time.
R305 can be grounded when single supply is powered, and negative voltage is connect in dual power supply, can be played and be stablized Jing Yin control electricity
The effect on road, when Q5 ends because R305 is only negative level, Q02 base stages always be it is lower than emitter voltage not
Conducting, realize after Jing Yin delay on power amplifier signal without influence.
Above-mentioned muting control circuit, by the combination of triode, diode and resistance capacitance, utilize the charging and discharging of electric capacity
Time difference control the on or off of triode, the pulse voltage of switching on and shutting down moment is eliminated, so as to eliminating switching on and shutting down wink
Between noise, good muffling effect realizes the Jing Yin effect of switching on and shutting down, lifts Consumer's Experience, can not only effectively eliminate switch
Machine impact noise, and reflect that speed is fast, strong antijamming capability, reliability is high, and particularly high-speed switch machine noise has very repeatedly
Good inhibition, and cost is low, reaching reduces noise caused by switching on and shutting down, so as to reach the purpose of Jing Yin control, electricity
Road is simple and practical, and cost of manufacture is relatively low, compatibility preferably, on the power amplifier that can be widely applied to need switching on and shutting down Jing Yin.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses several embodiments of the present utility model, and its description is more specific and detailed,
But therefore it can not be interpreted as the limitation to utility model patent scope.It should be pointed out that the common skill for this area
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (10)
- A kind of 1. muting control circuit, it is characterised in that including the first current limiting device, the second current limiting device, the first energy storage device, First switch pipe and second switch pipe, the input connection power access end of the first switch pipe, the first switch pipe Control terminal connects the first end of first current limiting device, and the second end of first current limiting device connects first accumulator The first end of part, the second end ground connection of first energy storage device, the first end of second current limiting device connect the power supply Incoming end, the second end of second current limiting device connect the second end of first current limiting device and first energy storage device First end common port, the output end of the first switch pipe connects the control terminal of the second switch pipe, and described second opens The output head grounding of pipe is closed, the input of the second switch pipe is used to connect external power amplifier.
- 2. muting control circuit according to claim 1, it is characterised in that also including the first diode, the second diode With the second energy storage device, the input of the first switch pipe connects the power access end by first diode, and The anode of first diode connects the power access end, and the negative electrode of second diode connects first diode Anode, the anode of second diode connect first current limiting device the second end and first energy storage device the The common port of one end, the first end of second energy storage device connect the negative electrode of first diode and the first switch pipe Input common port, second energy storage device the second end ground connection.
- 3. muting control circuit according to claim 1, it is characterised in that also including the 3rd current limiting device, described first The output end of switching tube connects the control terminal of the second switch pipe by the 3rd current limiting device.
- 4. muting control circuit according to claim 3, it is characterised in that also including the 3rd diode, the described 3rd 2 The anode of pole pipe connects the second end of the 3rd current limiting device, and the negative electrode of the 3rd diode connects the second switch pipe Control terminal.
- 5. muting control circuit according to claim 1, it is characterised in that also including the 4th current limiting device, the described 4th The first end of current limiting device connects the output end of the first switch pipe, the second end ground connection of the 4th current limiting device.
- 6. muting control circuit according to claim 1, it is characterised in that also including the 4th current limiting device, the described 4th The first end of current limiting device connects the output end of the first switch pipe, the second end connection negative electricity of the 4th current limiting device Source.
- 7. muting control circuit according to claim 1, it is characterised in that the first switch pipe is the first triode, The second switch pipe is the second triode.
- 8. muting control circuit according to claim 7, it is characterised in that first triode is PNP triode, institute It is NPN triode to state the second triode.
- 9. muting control circuit according to claim 1, it is characterised in that first current limiting device and second limit It is resistance to flow device.
- 10. muting control circuit according to claim 1, it is characterised in that first energy storage device is electrochemical capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720839050.8U CN206993394U (en) | 2017-07-11 | 2017-07-11 | Muting control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720839050.8U CN206993394U (en) | 2017-07-11 | 2017-07-11 | Muting control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN206993394U true CN206993394U (en) | 2018-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720839050.8U Active CN206993394U (en) | 2017-07-11 | 2017-07-11 | Muting control circuit |
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| Country | Link |
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| CN (1) | CN206993394U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109413548A (en) * | 2018-12-04 | 2019-03-01 | 叶年福 | Prime power amplification circuit |
-
2017
- 2017-07-11 CN CN201720839050.8U patent/CN206993394U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109413548A (en) * | 2018-12-04 | 2019-03-01 | 叶年福 | Prime power amplification circuit |
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