CN107580278A - A kind of Stereo Switch machine protecting against shock sound and output short circuit protection circuit - Google Patents
A kind of Stereo Switch machine protecting against shock sound and output short circuit protection circuit Download PDFInfo
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- CN107580278A CN107580278A CN201710966409.2A CN201710966409A CN107580278A CN 107580278 A CN107580278 A CN 107580278A CN 201710966409 A CN201710966409 A CN 201710966409A CN 107580278 A CN107580278 A CN 107580278A
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Abstract
The present invention relates to audio amplifier field, more particularly to a kind of Stereo Switch machine protecting against shock sound and output short circuit protection circuit, including mu balanced circuit, delay circuit, electronic switch, mute circuit, short-circuit detecting circuit, shutdown discharge circuit and negative pressure circuit；The mu balanced circuit is made up of diode N1, diode N2, diode N3, resistance R1, resistance R2, resistance R3, electric capacity C1, is the voltage of circuit with stable；The delay circuit is made up of resistance R4, resistance R5, resistance R6, electric capacity C2, electric capacity C3, diode N4, triode T2, is delayed for start.The advantage of the invention is that：This circuit has used electronic circuit to replace the common audio amplifier relay to be used, and the electronic circuit does not only have the function of protecting against shock sound, the also function with short-circuit protection; the volume of circuit board is reduced simultaneously, reduces energy consumption, it is more environmentally-friendly; transfer voice process loss is smaller, and sound-reducing degree is more preferable.
Description
Technical field
The present invention relates to audio amplifier field, more particularly to a kind of Stereo Switch machine protecting against shock sound and output short circuit protection circuit.
Background technology
At present, the existing speaker products of in the market often occur " bang bang " in start or shutdown in use
Impulsive sound, its main cause are that electric signal produces transient change and circuit is formed and impacted in audio amplifier switching on and shutting down, are on the one hand led
Very bad Consumer's Experience has been caused, on the other hand can produce damage to the hardware of audio amplifier.
At present, it is domestic also to there are some technical schemes to be suggested, for solving the above problems, such as utility model patent
201420530974.6 a kind of audio amplifier switching on and shutting down anti-impact circuit, the utility model patent discloses a kind of audio amplifier switching on and shutting down erosion control
Circuit is hit, power input that it includes sequentially electrically connecting, charging resistor, voltage-regulator diode, master control switch triode and to sound
The supply voltage end of case power supply, this circuit also include charging capacitor and discharge diode, one end connection voltage stabilizing of charging capacitor
The negative pole of diode, the other end ground connection of charging capacitor, discharge diode are connected in the both ends of charging resistor in parallel, two poles of discharging
The negative pole of the positive pole connection voltage-regulator diode of pipe, the negative pole of discharge diode are earth terminal, the colelctor electrode of master control switch triode
Also electrically connected by the control triode that shuts down with power-off operation end, the base stage and master control switch triode of shutdown control triode
Colelctor electrode is connected, and the grounded emitter of shutdown control triode, the colelctor electrode of shutdown control triode is connected with power-off operation end.
Although impact of the electric signal to circuit when above-mentioned technical proposal can slow down, reduce switching on and shutting down, noise is reduced, then, should
Circuit structure is complicated, and manufacturing cost is higher.
The content of the invention
Present invention solves the technical problem that it is that can often go out in start or shutdown during audio amplifier use in the prior art
The impulsive sound of existing " bang bang ", its main cause is that electric signal produces transient change and circuit is formed and rushed in audio amplifier switching on and shutting down
Hit, on the one hand result in very bad Consumer's Experience, on the other hand can produce damage to the hardware of audio amplifier.
To solve the above problems, we have proposed a kind of Stereo Switch machine protecting against shock sound and output short circuit protection circuit, sheet
Circuit has used electronic circuit to replace the common audio amplifier relay to be used, and the electronic circuit does not only have the function of protecting against shock sound,
Also have the function of short-circuit protection, due to eliminating relay, reduce the volume of circuit board, reduce energy consumption, more environmentally-friendly, sound
The loss of sound transmitting procedure is smaller, and sound-reducing degree is more preferable.
To realize the demand, the present invention is achieved through the following technical solutions above-mentioned purpose：A kind of Stereo Switch machine is prevented
Impulsive sound and output short circuit protection circuit, including mu balanced circuit, delay circuit, electronic switch, mute circuit, short-circuit detecting electricity
Road, shutdown discharge circuit and negative pressure circuit；
The mu balanced circuit is by diode N1, diode N2, diode N3, resistance R1, resistance R2, resistance R3, electric capacity C1
Composition, it is the voltage of circuit with stable；
The delay circuit is by resistance R4, resistance R5, resistance R6, electric capacity C2, electric capacity C3, diode N4, triode T2 groups
Into for start delay；
The electronic switch is made up of triode T3, resistance R8, resistance R10, resistance R7, diode N6, diode N7, is
Amplifirer work provides required bias；
The mute circuit is by diode N5, diode N8, triode T4, triode T5, resistance R9, resistance R11, resistance
R13, resistance R14 are formed, and it is Jing Yin to provide prime for amplifirer；
The short-circuit detecting circuit is by diode N12, diode N13, triode T19, electric capacity C15, resistance R38, resistance
R39 is formed；
The shutdown discharge circuit is made up of triode T1, diode N14；
The negative pressure electricity routing resistance R15, diode N8, diode N9 composition carry in non-mute state for triode T6
For negative pressure, ensure that triode T6 is completely switched off.
More specifically, a kind of Stereo Switch machine protecting against shock sound and output short circuit protection circuit, two poles of the mu balanced circuit
Pipe N1 is 1N4007 commutation diodes, and diode N2 is 1N4007 commutation diodes and diode N3 is that 1N4148 switchs two poles
Pipe, resistance R1 is 1K Ω, and resistance R2 is 4.7K Ω, and resistance R3 is 22K Ω, and electric capacity C1 is 50V1UF.
More specifically, a kind of Stereo Switch machine protecting against shock sound and output short circuit protection circuit, the resistance of the delay circuit
R4 is 22k Ω, and resistance R5 is 470k Ω, and resistance R6 is 100k Ω, and electric capacity C2 is polar capacitor, and capacity 47UF, electric capacity C3 are
Nonpolar electric capacity, capacity 2.2UF, diode N4 are 5.1 volts of voltage-regulator diodes, and triode T2 is NPN low-power transistors, tool
Body is 5551 types.
More specifically, a kind of Stereo Switch machine protecting against shock sound and output short circuit protection circuit, three poles of the electronic switch
Pipe T3 is PNP type triode, specially 5401 types, and resistance R8 is 100k Ω, and resistance R10 is 100 Ω, and resistance R7 is 33k Ω, two
Pole pipe N6 and diode N7 is 1N4148 types.
More specifically, a kind of Stereo Switch machine protecting against shock sound and output short circuit protection circuit, two poles of the mute circuit
Pipe N5 and diode N8 is 1N4148 types, and triode T4 is NPN low-power transistors, specially 5551 types；Triode T5 is
PNP type triode, specially 5401 types；Resistance R9 is 100k Ω, and resistance R11 is 100k Ω, and resistance R13 is 33k Ω, resistance
R14 is 100k Ω.
More specifically, a kind of Stereo Switch machine protecting against shock sound and output short circuit protection circuit, short-circuit detecting circuit is by two poles
Pipe N12 and diode N13 is 1N4148 types, and triode T19 is NPN type low-power transistor, specially 9014 types；Electric capacity
C15 is 2.2UF polar capacitors, and resistance R38 is 2.2K Ω, and resistance R39 is 15k Ω.
More specifically, a kind of Stereo Switch machine protecting against shock sound and output short circuit protection circuit, shutdown discharge circuit is by three poles
Pipe T1 is positive-negative-positive, specially 9015 types；Diode N14 is 1N4148 types.
More specifically, a kind of Stereo Switch machine protecting against shock sound and output short circuit protection circuit, the resistance R15 of negative pressure circuit are
220k Ω, diode N8 and diode N9 are 1N4148 types, and triode T6 is negative-positive-negative transistor, specially 8050 types.
A kind of Stereo Switch machine protecting against shock sound and output short circuit protection circuit provided by the invention, after start, due to three poles
Pipe T2 is working at once in cut-off state, triode T5, and triode T5 output high level is Jing Yin power amplifier prime, and triode T3 exists
Cut-off state, power amplifier do not have bias voltage not work, and power amplifier will not have sound output, when so effectively prevent start
Impulsive sound, general 4 seconds or so, electric capacity C3 both end voltages rose to 6V or so, and triode T2 enters working condition, triode T3
It is open-minded, voltage is provided for power amplifier, after triode T2 work, triode T5 ends at once, and mute circuit does not work, at this time started shooting
Impulsive sound is without power amplifier enters normal operating conditions.When output end has short-circuit conditions, triode T19 works at once,
Voltage shorted to earth, triode T2 needed for triode T2 work are not worked, triode T5 output mute voltages, triode T3
Cut-off, power amplifier do not work, and thus serve short-circuit protection effect.When shutdown, R2 electric discharges, because electric capacity C1 capacity is seldom,
Triode T1 is turned at once, and triode T2 does not have operating voltage at once, and triode T3 ends at once, and so shutdown would not go out again
Existing sound.
The beneficial effects of the present invention are：This circuit has used electronic circuit to replace the common audio amplifier relay to be used,
The electronic circuit does not only have the function of protecting against shock sound, the also function with short-circuit protection, while reduce the volume of circuit board, drop
Low energy consumption, more environmentally-friendly, transfer voice process loss is smaller, and sound-reducing degree is more preferable.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described.It is clear that drawings in the following description are of the invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other accompanying drawings.
Fig. 1 is the mu balanced circuit partial schematic diagram of the present embodiment；
Fig. 2 is the delay circuit partial schematic diagram of the present embodiment；
Fig. 3 is the electronic switching circuit partial schematic diagram of the present embodiment；
Fig. 4 is the mute circuit partial schematic diagram of the present embodiment；
Fig. 5 is the short-circuit detecting circuit partial schematic diagram of the present embodiment；
Fig. 6 is the shutdown discharge circuit partial schematic diagram of the present embodiment；
Fig. 7 is the negative pressure circuit part schematic diagram of the present embodiment；
Fig. 8 is that the main functional circuit of the present embodiment forms schematic diagram.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described.Obviously, described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Embodiment 1:
A kind of Stereo Switch machine protecting against shock sound and output short circuit protection circuit, including mu balanced circuit, delay circuit, electronic cutting
Pass, mute circuit, short-circuit detecting circuit, shutdown discharge circuit and negative pressure circuit；
The mu balanced circuit is by diode N1, diode N2, diode N3, resistance R1, resistance R2, resistance R3, electric capacity C1
Composition, it is the voltage of circuit with stable；
The delay circuit is by resistance R4, resistance R5, resistance R6, electric capacity C2, electric capacity C3, diode N4, triode T2 groups
Into for start delay；
The electronic switch is made up of triode T3, resistance R8, resistance R10, resistance R7, diode N6, diode N7, is
Amplifirer work provides required bias；
The mute circuit is by diode N5, diode N8, triode T4, triode T5, resistance R9, resistance R11, resistance
R13, resistance R14 are formed, and it is Jing Yin to provide prime for amplifirer；
The short-circuit detecting circuit is by diode N12, diode N13, triode T19, electric capacity C15, resistance R38, resistance
R39 is formed；
The shutdown discharge circuit is made up of triode T1, diode N14；
The negative pressure electricity routing resistance R15, diode N8, diode N9 composition carry in non-mute state for triode T6
For negative pressure, ensure that triode T6 is completely switched off.
The diode N1 of the mu balanced circuit is 1N4007 commutation diodes, and diode N2 is provided with two and is respectively
1N4007 commutation diodes and 1N4148 switching diodes, diode N3 are 1N4007 commutation diodes, and resistance R1 is 1K Ω, electricity
Resistance R2 is 4.7K Ω, and resistance R3 is that K Ω 22K Ω, electric capacity C1 are 50V1UF.
The resistance R4 of the delay circuit is 22k Ω, and resistance R5 is 470k Ω, and resistance R6 is 100k Ω, and electric capacity C2 is pole
Property electric capacity, capacity 47UF, electric capacity C3 are nonpolar electric capacity, capacity 2.2UF, and diode N4 is 5.1 volts of voltage-regulator diodes, three
Pole pipe T2 is NPN low-power transistors, specially 5551 types.
The triode T3 of the electronic switch is PNP type triode, specially 5401 types, and resistance R8 is 100k Ω, resistance
R10 is 100 Ω, and resistance R7 is that 33k Ω, diode N6 and diode N7 are 1N4148 types.
The diode N5 and diode N8 of the mute circuit are 1N4148 types, and triode T4 is the pole of NPN small-powers three
Pipe, specially 5551 types；Triode T5 is PNP type triode, specially 5401 types；Resistance R9 is 100k Ω, and resistance R11 is
100k Ω, resistance R13 are 33k Ω, and resistance R14 is 100k Ω.
Short-circuit detecting circuit is 1N4148 types by diode N12 and diode N13, and triode T19 is NPN type small-power
Triode, specially 9014 types；Electric capacity C15 is polar capacitor, and resistance R38 is 2.2K Ω, and resistance R39 is 15k Ω.
Shutdown discharge circuit is positive-negative-positive, specially 9015 types by triode T1；Diode N14 is 1N4148 types.
The resistance R15 of negative pressure circuit is that 220k Ω, diode N8 and diode N9 are 1N4148 types, and triode T6 is
Negative-positive-negative transistor, specially 8050 types.
A kind of the Stereo Switch machine protecting against shock sound and output short circuit protection circuit that the present embodiment provides, after start, due to three
Pole pipe T2 is working at once in cut-off state, triode T5, and triode T5 output high level is Jing Yin power amplifier prime, triode T3
In cut-off state, power amplifier does not have bias voltage not work, and power amplifier will not have sound output, general 4 seconds or so, electric capacity C3 two
Terminal voltage rises to 6V or so, and triode T2 enters working condition, and triode T3 is open-minded, and voltage, triode T2 are provided for power amplifier
After work, triode T5 ends at once, and mute circuit does not work, and impulsive sound of at this time starting shooting is without power amplifier enters just
Normal working condition.When output end has short-circuit conditions, triode T19 works at once, voltage needed for triode T2 work over the ground
Short circuit, triode T2 are not worked, and triode T5 output mute voltages, triode T3 is also switched off, and power amplifier does not work, and thus plays
Short-circuit protection effect.When shutdown, R2 electric discharges, because electric capacity C1 capacity is seldom, triode T1 is turned at once, triode T2 horses
Upper no operating voltage, triode T3 end at once, and so shutdown would not occur sound again.
The beneficial effect of the present embodiment is：This circuit has used electronic circuit to replace the common audio amplifier relay to be used
Device, the electronic circuit do not only have the function of protecting against shock sound, the also function with short-circuit protection, while reduce the body of circuit board
Product, energy consumption is reduced, more environmentally-friendly, transfer voice process loss is smaller, and sound-reducing degree is more preferable.
Claims (8)
1. a kind of Stereo Switch machine protecting against shock sound and output short circuit protection circuit, it is characterised in that：Including mu balanced circuit, delay electricity
Road, electronic switch, mute circuit, short-circuit detecting circuit, shutdown discharge circuit and negative pressure circuit；
The mu balanced circuit is made up of diode N1, diode N2, diode N3, resistance R1, resistance R2, resistance R3, electric capacity C1,
For the voltage of circuit with stable；
The delay circuit is made up of resistance R4, resistance R5, resistance R6, electric capacity C2, electric capacity C3, diode N4, triode T2, is
Start delay；
The electronic switch is made up of triode T3, resistance R8, resistance R10, resistance R7, diode N6, diode N7, is power amplifier
Device work provides required bias；
The mute circuit by diode N5, diode N8, triode T4, triode T5, resistance R9, resistance R11, resistance R13,
Resistance R14 is formed, and it is Jing Yin to provide prime for amplifirer；
The short-circuit detecting circuit is by diode N12, diode N13, triode T19, electric capacity C15, resistance R38, resistance R39 groups
Into；
The shutdown discharge circuit is made up of triode T1, diode N14；
The negative pressure electricity routing resistance R15, diode N8, diode N9 composition provide negative in non-mute state for triode T6
Pressure, ensure that triode T6 is completely switched off.
2. Stereo Switch machine protecting against shock sound as claimed in claim 1 and output short circuit protection circuit, it is characterised in that：It is described steady
The diode N1 of volt circuit is 1N4007 commutation diodes, and diode N2 is 1N4007 commutation diodes and diode N3 is
1N4148 switching diodes, resistance R1 are 1K Ω, and resistance R2 is 4.7K Ω, and resistance R3 is 22K Ω, and electric capacity C1 is 50V1UF.
3. Stereo Switch machine protecting against shock sound as claimed in claim 1 and output short circuit protection circuit, it is characterised in that：It is described to prolong
When circuit resistance R4 be 22k Ω, resistance R5 is 470k Ω, and resistance R6 is 100k Ω, and electric capacity C2 is polar capacitor, and capacity is
47UF, electric capacity C3 are nonpolar electric capacity, and capacity 2.2UF, diode N4 are 5.1 volts of voltage-regulator diodes, and triode T2 is that NPN is small
Pliotron, specially 5551 types.
4. Stereo Switch machine protecting against shock sound as claimed in claim 1 and output short circuit protection circuit, it is characterised in that：The electricity
The triode T3 of sub switch is PNP type triode, specially 5401 types, and resistance R8 is 100k Ω, and resistance R10 is 100 Ω, resistance
R7 is that 33k Ω, diode N6 and diode N7 are 1N4148 types.
5. Stereo Switch machine protecting against shock sound as claimed in claim 1 and output short circuit protection circuit, it is characterised in that：It is described quiet
The diode N5 and diode N8 of sound circuit are 1N4148 types, and triode T4 is NPN low-power transistors, and specially 5551
Type；Triode T5 is PNP type triode, specially 5401 types；Resistance R9 is 100k Ω, and resistance R11 is 100k Ω, resistance R13
For 33k Ω, resistance R14 is 100k Ω.
6. Stereo Switch machine protecting against shock sound as claimed in claim 1 and output short circuit protection circuit, it is characterised in that：Short circuit inspection
Slowdown monitoring circuit is 1N4148 types by diode N12 and diode N13, and triode T19 is NPN type low-power transistor, is specially
9014 types；Electric capacity C15 is 2.2UF polar capacitors, and resistance R38 is 2.2K Ω, and resistance R39 is 15k Ω.
7. Stereo Switch machine protecting against shock sound as claimed in claim 1 and output short circuit protection circuit, it is characterised in that：Shutdown is put
Circuit is positive-negative-positive, specially 9015 types by triode T1；Diode N14 is 1N4148 types.
8. Stereo Switch machine protecting against shock sound as claimed in claim 1 and output short circuit protection circuit, it is characterised in that：Negative pressure electricity
The resistance R15 on road is that 220k Ω, diode N8 and diode N9 are 1N4148 types, and triode T6 is negative-positive-negative transistor,
Specially 8050 types.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710966409.2A CN107580278B (en) | 2017-10-17 | 2017-10-17 | Protection circuit for preventing impact sound and outputting short circuit during switching on and switching off of sound equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710966409.2A CN107580278B (en) | 2017-10-17 | 2017-10-17 | Protection circuit for preventing impact sound and outputting short circuit during switching on and switching off of sound equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107580278A true CN107580278A (en) | 2018-01-12 |
| CN107580278B CN107580278B (en) | 2020-12-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710966409.2A Active CN107580278B (en) | 2017-10-17 | 2017-10-17 | Protection circuit for preventing impact sound and outputting short circuit during switching on and switching off of sound equipment |
Country Status (1)
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| CN (1) | CN107580278B (en) |
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| CN107580278B (en) | 2020-12-15 |
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