CN203984360U - Transistor vehicle power amplifier circuit without impact sound generated in switching process - Google Patents
Transistor vehicle power amplifier circuit without impact sound generated in switching process Download PDFInfo
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- CN203984360U CN203984360U CN201420430817.8U CN201420430817U CN203984360U CN 203984360 U CN203984360 U CN 203984360U CN 201420430817 U CN201420430817 U CN 201420430817U CN 203984360 U CN203984360 U CN 203984360U
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Abstract
A kind of transistor vehicle power amplifier circuit without impact sound generated in switching process, it comprises: a constant-current source module, an and optocoupler control module, wherein said constant-current source module is provided with a symmetrical difference channel, by optocoupler control circuit, control optocoupler, after constant-current source module receives the signal of optocoupler, unlatching work.The utility model technology has realized " vehicle power amplifier switching on and shutting down are without cloop " function, and circuit is reliable and stable, and existing needed component size is little, facilitates PCB design feature, and material requested has no special requirements, and purchases feature easily.
Description
Technical field
The utility model relates to vehicle power amplifier control circuit field, relates in particular to a kind ofly to apply transistor to make vehicle power amplifier switching on and shutting down are the circuit without impulsive sound.
Background technology
In the power amplifier that uses discrete component to make, generally all exist switching on and shutting down to have impulsive sound (for example " bang " sound) problem, the impact signal of impulsive sound in circuit produces, and not only impact is used, and loudspeaker are also had to infringement.The way of taking for solution vehicle power amplifier switching on and shutting down " without impulsive sound " has conventionally:
The one,, the output of power amplifier adds Control; The 2nd,, between the power amplifying part of power amplifier and prime are amplified with triode as squelch tube, eliminate the impulsive sound that prime causes.
Wherein the operation principle of the first solution is: between the output of power of vehicle amplifier and loudspeaker, add relay: when power amplifier is started shooting, first allow relay postpone, after the impact producing in circuit, attracting electric relay, is linking up the output of power amplifier and loudspeaker, realizes start without impulsive sound.Moment when shutdown first disconnects relay, cuts off the connection of power amplifier output and loudspeaker, realizes shutdown without impulsive sound.The second settling mode is: the mode of controlling with squelch tube between power amplifying part and prime amplifier section: in the moment of power amplifier start, the impact signal ground connection that squelch tube produces prime, allows squelch tube quit work, in order to avoid affect signal again after delay.Can reduce start impulsive sound; During shutdown, first allow squelch tube work, the signal of prime output over the ground, realize and put minimizing impulsive sound into.
Adopt the first: the mode that adds Control can realize switching on and shutting down without impulsive sound, because the characteristic of relay also has its shortcoming in application: first, at multichannel, in powerful power amplifier, needed relay volume is large, the occasion that cube is little to be not suitable for using.Secondly, relay contact is Mechanical Contact, therefore has restriction in useful life.
The mode volume that employing the second adds squelch tube control is little, can reduce switching on and shutting down cloop, but also have shortcoming: first, current special-purpose squelch tube conducting resistance can be accomplished very little, if impulsive sound derives from prime, squelch tube may well suppress impact signal.But the impact sound generated in switching process of a lot of power amplifiers is not only amplified and is produced by prime, simultaneously also relevant with power-amplifier stage.Power amplifier part is because how many potential change also can produce impulsive sound, so this design can not solve the impulsive sound that power-amplifier stage produces, can only reduce the impulsive sound of complete machine.Secondly, squelch tube control circuit is connected with the elementary of step-up transformer in vehicle power amplifier conventionally.And squelch tube will be controlled, be signal circuit, therefore than being easier to, crosstalk.
Utility model content
The technical problems to be solved in the utility model is to overcome the deficiency that above-mentioned prior art exists; and a kind of transistor vehicle power amplifier circuit without impact sound generated in switching process is proposed; this transistor vehicle power amplifier circuit without impact sound generated in switching process can effectively prevent from producing impact noise when opening or closing power amplifier, protection power amplifier.
For solving the problems of the technologies described above, the utility model adopts following technical scheme:
Without a transistor vehicle power amplifier circuit for impact sound generated in switching process, it comprises: a constant-current source module, and an optocoupler control module, and wherein said constant-current source module comprises: resistance R 1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15; Diode D1, D2, D3, D4; Triode Q1, Q2, Q3, Q4, Q5, Q6, Q7, U1; Capacitor C 1, C2, C3; Optocoupler U2;
Wherein, described resistance R 1 is connected in a positive source, and the other end is connected in the base stage of described triode Q1, and the two ends of described resistance R 1 are also in parallel one by diode D1, the series circuit that D2 forms; The emitter of described triode Q1 is connected in the positive pole that a resistance R 2 is connected in diode D1 afterwards; Described triode Q1 node between diode D2 is connected in a resistance R 4, and the other end of described resistance R 4 is connected in the collector electrode of a controlled triode U1, and the emitter of described triode U1 is connected in the negative pole that a resistance R 5 is connected in an external power source afterwards; The two ends of described resistance R 5 are parallel with one by diode D3, the series circuit that D4 forms, node between described triode U1 and resistance R 5 is connected in the base stage that is connected in triode Q2 after a resistance R 6, and the emitter of described triode Q2 is connected after a resistance R 7 and is connected in power cathode; Power supply V+ is connected in a resistance R 10, the other end of described resistance R 10 is connected in the collector electrode of a triode Q3, the base stage of triode Q3 is connected in the base stage of another triode Q4, the emitter of described triode Q3 is series at the base stage that is connected in another triode Q5 after a series circuit being comprised of resistance R 11 and resistance R 12, described triode Q5 collector electrode be connected in V+; The collector electrode of described triode Q4 is connected after a resistance R 15 and is connected in V+, and the emitter of described triode Q5 is connected in the emitter that is connected in triode Q6 after the series circuit being comprised of resistance R 13 and resistance R 14, and the collector electrode of triode Q6 is connected in V+ and holds; The collector electrode of described triode Q1 is connected in the node between resistance R 13 and R14 by wire, and the collector electrode of described triode Q2 is connected in the node between resistance R 12 and R11 by wire; The output of described constant-current source module is the node between resistance R 10 and triode Q3 collector electrode, and the node between resistance R 15 and triode Q4 collector electrode.
Wherein, described optocoupler control circuit comprises: R16, R17, R19, optocoupler U2, diode D5, D6, capacitor C 3, and a switch W1;
Wherein, one end of described switch W1 is connected in power supply, the other end is connected in constant-current source module, between described switch W1 and constant-current source module, also by wire, be connected in described optocoupler U2 simultaneously, the other end of described optocoupler U2 is connected in resistance R 16, and the other end of described resistance R 16 is connected in the collector electrode of triode Q7; The emitter of triode Q7 is connected in diode D5 ground connection afterwards, the base stage of described triode Q7 is connected after a resistance R 17 and is connected in optocoupler U1, described resistance R 17 two ends are also parallel with a diode D6, between node between the base stage of described triode Q7 and diode D6 and ground, be also in series with a capacitor C 3, the negative pole end of the described diode D6 ground connection after described resistance R 19 of connecting.
Wherein, described capacitor C 1 and C3 are polar capacitor.
Wherein, described triode U1 is a triode of being located at vehicle console.
Preferably, be also in series with a resistance R 9 between described triode Q3 and Q4 base stage between node and ground, described resistance R 9 two ends are also parallel with a capacitor C 2.
Compared with prior art, a kind of transistor vehicle power amplifier circuit without impact sound generated in switching process of the utility model, the utility model technology has realized " vehicle power amplifier switching on and shutting down are without cloop " function, circuit is reliable and stable, existing needed component size is little, facilitate PCB design feature, and material requested has no special requirements, purchase feature easily.
Accompanying drawing explanation
Fig. 1 is that the utility model is without the circuit diagram of the transistor vehicle power amplifier circuit of impact sound generated in switching process;
Fig. 2 is that the utility model is without the optocoupler control section circuit diagram of the transistor vehicle power amplifier circuit of impact sound generated in switching process.
Embodiment
The exemplary embodiment that embodies the utility model feature & benefits will describe in detail in the following description.Be understood that the utility model can have various variations on different execution modes, it neither departs from scope of the present utility model, and explanation wherein and to be shown in be when the use that explain in essence, but not in order to limit the utility model.
Consult accompanying drawing 1, in the present embodiment, a kind of transistor vehicle power amplifier circuit without impact sound generated in switching process, it comprises: a constant-current source module, and an optocoupler control module, wherein said constant-current source module comprises: resistance R 1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15; Diode D1, D2, D3, D4; Triode Q1, Q2, Q3, Q4, Q5, Q6, Q7, U1; Capacitor C 1, C2, C3; Optocoupler U2;
Wherein, described resistance R 1 is connected in a positive source, and the other end is connected in the base stage of described triode Q1, and the two ends of described resistance R 1 are also in parallel one by diode D1, the series circuit that D2 forms; The emitter of described triode Q1 is connected in the positive pole that a resistance R 2 is connected in diode D1 afterwards; Described triode Q1 node between diode D2 is connected in a resistance R 4, and the other end of described resistance R 4 is connected in the collector electrode of a controlled triode U1, and the emitter of described triode U1 is connected in the negative pole that a resistance R 5 is connected in an external power source afterwards; The two ends of described resistance R 5 are parallel with one by diode D3, the series circuit that D4 forms, node between described triode U1 and resistance R 5 is connected in the base stage that is connected in triode Q2 after a resistance R 6, and the emitter of described triode Q2 is connected after a resistance R 7 and is connected in power cathode; Power supply V+ is connected in a resistance R 10, the other end of described resistance R 10 is connected in the collector electrode of a triode Q3, the base stage of triode Q3 is connected in the base stage of another triode Q4, the emitter of described triode Q3 is series at the base stage that is connected in another triode Q5 after a series circuit being comprised of resistance R 11 and resistance R 12, described triode Q5 collector electrode be connected in V+; The collector electrode of described triode Q4 is connected after a resistance R 15 and is connected in V+, and the emitter of described triode Q5 is connected in the emitter that is connected in triode Q6 after the series circuit being comprised of resistance R 13 and resistance R 14, and the collector electrode of triode Q6 is connected in V+ and holds; The collector electrode of described triode Q1 is connected in the node between resistance R 13 and R14 by wire, and the collector electrode of described triode Q2 is connected in the node between resistance R 12 and R11 by wire; The output of described constant-current source module is the node between resistance R 10 and triode Q3 collector electrode, and the node between resistance R 15 and triode Q4 collector electrode.
Wherein, described optocoupler control circuit comprises: R16, R17, R19, optocoupler U2, diode D5, D6, capacitor C 3, and a switch W1;
Wherein, one end of described switch W1 is connected in power supply, the other end is connected in constant-current source module, between described switch W1 and constant-current source module, also by wire, be connected in described optocoupler U2 simultaneously, the other end of described optocoupler U2 is connected in resistance R 16, and the other end of described resistance R 16 is connected in the collector electrode of triode Q7; The emitter of triode Q7 is connected in diode D5 ground connection afterwards, the base stage of described triode Q7 is connected after a resistance R 17 and is connected in optocoupler U1, described resistance R 17 two ends are also parallel with a diode D6, between node between the base stage of described triode Q7 and diode D6 and ground, be also in series with a capacitor C 3, the negative pole end of the described diode D6 ground connection after described resistance R 19 of connecting.
Wherein, described capacitor C 1 and C3 are polar capacitor.
Wherein, described triode U1 is a triode of being located at vehicle console.
Preferably, be also in series with a resistance R 9 between described triode Q3 and Q4 base stage between node and ground, described resistance R 9 two ends are also parallel with a capacitor C 2.
Constant-current source module is by R1, R2, and R3, R4, R5, R6, R7, Q1, Q2, D1, D2, D3, D4, the inner triode U1 of PC forms, and by the photo-electric control that is subject to optocoupler.PC receives photosignal and works, otherwise closes.Because what adopt in difference channel is symmetrical structure, when difference channel work with while closing, can't produce impulsive sound.When difference channel is not worked, even if vehicle power amplifier prime has impact signal also can not formed greatly cloop.Optocoupler control section is comprised of elements such as Q7.After vehicle power amplifier is opened, the moment of opening at power amplifier, in circuit, produce and impact; R17, D6, C3 forms delay circuit.When C3 electric capacity is full of electricity, make Q7 conducting, the triode U1 conducting in optocoupler is lighted and made to the light-emitting diode in optocoupler U2, opens difference channel work.Because start has time delay, while produce impacting in circuit, difference channel is not worked, and now power amplifier is in mute state, waits to impact later just difference channel and just work, and realizes start without cloop.
When vehicle power amplifier is closed, 12V loss of voltage.The voltage of C3 capacitance stores is through D6, and R19 discharges rapidly.Q7 ends and light-emitting diode in optocoupler U2 is extinguished, triode U1 cut-off in optocoupler.Difference channel quits work.Because the electric discharge of the voltage in C3 rapidly.Before the moment of shutdown produces impact, difference channel quits work, realizes shutdown without cloop.Because the application's circuit employing optocoupler is realized isolated controlling, between two circuits, can not crosstalk.
It should be noted that; these are only better possible embodiments of the present utility model; and unrestricted protection range of the present utility model, the equivalent structure that all utilization the utility model specifications and accompanying drawing content have been done changes, and is all included in protection range of the present utility model.
Claims (5)
1. without a transistor vehicle power amplifier circuit for impact sound generated in switching process, it is characterized in that, comprising: a constant-current source module, and an optocoupler control module, wherein said constant-current source module comprises: resistance R 1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15; Diode D1, D2, D3, D4; Triode Q1, Q2, Q3, Q4, Q5, Q6, Q7, U1; Capacitor C 1, C2, C3; Optocoupler U2;
Wherein, described resistance R 1 is connected in a positive source, and the other end is connected in the base stage of described triode Q1, and the two ends of described resistance R 1 are also in parallel one by diode D1, the series circuit that D2 forms; The emitter of described triode Q1 is connected in the positive pole that a resistance R 2 is connected in diode D1 afterwards; Between described triode Q1 and diode D2, node is connected in a resistance R 4, and the other end of described resistance R 4 is connected in the collector electrode of a controlled triode U1, and the emitter of described triode U1 is connected in the negative pole that a resistance R 5 is connected in an external power source afterwards; The two ends of described resistance R 5 are parallel with one by diode D3, the series circuit that D4 forms, node between described triode U1 and resistance R 5 is connected in the base stage that is connected in triode Q2 after a resistance R 6, and the emitter of described triode Q2 is connected after a resistance R 7 and is connected in power cathode; Power supply V+ is connected in a resistance R 10, the other end of described resistance R 10 is connected in the collector electrode of a triode Q3, the base stage of triode Q3 is connected in the base stage of another triode Q4, the emitter of described triode Q3 is series at the base stage that is connected in another triode Q5 after a series circuit being comprised of resistance R 11 and resistance R 12, described triode Q5 collector electrode be connected in V+; The collector electrode of described triode Q4 is connected after a resistance R 15 and is connected in V+, and the emitter of described triode Q5 is connected in the emitter that is connected in triode Q6 after the series circuit being comprised of resistance R 13 and resistance R 14, and the collector electrode of triode Q6 is connected in V+ and holds; The collector electrode of described triode Q1 is connected in the node between resistance R 13 and R14 by wire, and the collector electrode of described triode Q2 is connected in the node between resistance R 12 and R11 by wire; The output of described constant-current source module is the node between resistance R 10 and triode Q3 collector electrode, and the node between resistance R 15 and triode Q4 collector electrode.
2. the transistor vehicle power amplifier circuit without impact sound generated in switching process as claimed in claim 1, is characterized in that, described optocoupler control circuit comprises: resistance R 16, R17, R19, optocoupler U2, diode D5, D6, capacitor C 3, and a switch W1;
Wherein, one end of described switch W1 is connected in power supply, the other end is connected in constant-current source module, between described switch W1 and constant-current source module, also by wire, be connected in described optocoupler U2 simultaneously, the other end of described optocoupler U2 is connected in resistance R 16, and the other end of described resistance R 16 is connected in the collector electrode of triode Q7; The emitter of triode Q7 is connected in diode D5 ground connection afterwards, the base stage of described triode Q7 is connected after a resistance R 17 and is connected in optocoupler U1, described resistance R 17 two ends are also parallel with a diode D6, between node between the base stage of described triode Q7 and diode D6 and ground, be also in series with a capacitor C 3, the negative pole end of the described diode D6 ground connection after described resistance R 19 of connecting.
3. the transistor vehicle power amplifier circuit without impact sound generated in switching process as claimed in claim 2, is characterized in that, described capacitor C 1 and C3 are polar capacitor.
4. the transistor vehicle power amplifier circuit without impact sound generated in switching process as claimed in claim 2, is characterized in that, described triode U1 is a triode of being located at vehicle console.
5. the transistor vehicle power amplifier circuit without impact sound generated in switching process as claimed in claim 1, is characterized in that, is also in series with a resistance R 9 between described triode Q3 and Q4 base stage between node and ground, and described resistance R 9 two ends are also parallel with a capacitor C 2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420430817.8U CN203984360U (en) | 2014-07-31 | 2014-07-31 | Transistor vehicle power amplifier circuit without impact sound generated in switching process |
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| CN201420430817.8U CN203984360U (en) | 2014-07-31 | 2014-07-31 | Transistor vehicle power amplifier circuit without impact sound generated in switching process |
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| CN203984360U true CN203984360U (en) | 2014-12-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112866875A (en) * | 2021-01-14 | 2021-05-28 | 四川湖山电器股份有限公司 | Startup and shutdown anti-impact circuit for digital audio processor |
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2014
- 2014-07-31 CN CN201420430817.8U patent/CN203984360U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112866875A (en) * | 2021-01-14 | 2021-05-28 | 四川湖山电器股份有限公司 | Startup and shutdown anti-impact circuit for digital audio processor |
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