CN206865419U - A kind of protection circuit of audio-frequency power amplifier - Google Patents
A kind of protection circuit of audio-frequency power amplifier Download PDFInfo
- Publication number
- CN206865419U CN206865419U CN201720407311.9U CN201720407311U CN206865419U CN 206865419 U CN206865419 U CN 206865419U CN 201720407311 U CN201720407311 U CN 201720407311U CN 206865419 U CN206865419 U CN 206865419U
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- China
- Prior art keywords
- resistance
- triode
- audio
- crystal oscillator
- power amplifier
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model discloses a kind of protection circuit of audio-frequency power amplifier, including power supply EC, one end of the power supply EC is connected with one end of switch, the other end of the switch is connected to triode P3 colelctor electrode and resistance R1 one end, the other end of the resistance R1 is connected with triode P3 base stage and resistance R2 one end, the emitter stage of the triode P3 is connected with resistance R one end, the other end of the resistance R is connected with the resistance R2 other end, and the resistance R other end is connected to resistance Rc, resistance Rb and resistance Rm one end, the other end of the resistance Rc is connected to crystal oscillator C2 one end and triode Q1 colelctor electrode, the other end of the crystal oscillator C2 is connected with one end of loudspeaker Y 1.The utility model is simple in construction, and production cost is low, protects the electronic component in audio-frequency power amplifier, avoids electronic component from being damaged, increase the service life of audio-frequency power amplifier, meet the needs of people.
Description
Technical field
It the utility model is related to protection circuit technical field, more particularly to a kind of protection circuit of audio-frequency power amplifier.
Background technology
Power amplifier (English name：Power amplifier), referred to as " power amplifier ", refer in given distortion rate condition
Under, maximum power output can be produced to drive the amplifier of a certain load (such as loudspeaker).Power amplifier is in whole sound equipment
The pivotal role of " tissue, coordination " is served in system, can dominate whole system to a certain extent provide good sound
Matter exports.Audio-frequency power amplifier is to be amplified audio power, but existing existing audio-frequency power amplifier is not pacified typically
Equipped with current limiting unit, when the moment of switch connection, power supply immediate current is larger, often results in the electronics member of audio-frequency power amplifier
Device is damaged, and influences the service life of audio-frequency power amplifier, can not meet the use demand of people.
Utility model content
The purpose of this utility model is to solve shortcoming present in prior art, and a kind of audio power proposed is put
The protection circuit of big device.
To achieve these goals, the utility model employs following technical scheme：
A kind of protection circuit of audio-frequency power amplifier, including power supply EC, one end of the power supply EC are connected with switch
One end, the other end of the switch are connected to triode P3 colelctor electrode and resistance R1 one end, and the resistance R1's is another
One end is connected with triode P3 base stage and resistance R2 one end, and the emitter stage of the triode P3 is connected with resistance R one end,
The other end of the resistance R is connected with the resistance R2 other end, and the resistance R other end is connected to resistance Rc, resistance Rb
With resistance Rm one end, the other end of the resistance Rc is connected to crystal oscillator C2 one end and triode Q1 colelctor electrode, institute
The other end for stating crystal oscillator C2 is connected with one end of loudspeaker Y 1, and the other end of loudspeaker Y 1 is connected with the power supply EC other end, described
Triode Q1 basis set is connected to the resistance Rb other end and crystal oscillator C1 one end, and the other end of the crystal oscillator C1 is connected with
The resistance Rm other end, and the crystal oscillator C1 other end is connected with microphone MK one end, the other end and triode of the microphone MK
Q1 transmitting collection is respectively connected with the power supply EC other end, and the microphone MK other end, triode Q1 transmitting collection and loudspeaker Y 1
The other end is grounded.
Preferably, the power supply EC is lithium battery.
Preferably, the capacitance of the crystal oscillator C1 and crystal oscillator C2 are respectively 1uF and 10uF.
Preferably, the resistance Rc, resistance Rb and resistance Rm resistance are respectively 2K, 30K and 185R.
Preferably, the triode Q1 and triode P3 are silicone tube triode.
Preferably, the crystal oscillator C1 and crystal oscillator C2 are ceramic crystal oscillator.
Compared with prior art, the beneficial effects of the utility model are：
In the utility model, by increasing triode P3, resistance R, resistance R2 and resistance R1, the pressure drop on resistance R is utilized
The electric current passed through with triode P3 knot pressures and close to resistance R2 pressure drop, limitation triode P3, protects audio-frequency power amplifier
Interior electronic component, avoids electronic component from being damaged, and increases the service life of audio-frequency power amplifier, the utility model structure
Simply, production cost is low, protects the electronic component in audio-frequency power amplifier, avoids electronic component from being damaged, and increases audio
The service life of power amplifier, meets the needs of people.
Brief description of the drawings
Fig. 1 be the utility model proposes a kind of audio-frequency power amplifier protection circuit circuit diagram.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.
Reference picture 1, a kind of protection circuit of audio-frequency power amplifier, including power supply EC, the power supply EC one end connection
There is one end of switch, the other end of the switch is connected to triode P3 colelctor electrode and resistance R1 one end, the electricity
The resistance R1 other end is connected with triode P3 base stage and resistance R2 one end, and the emitter stage of the triode P3 is connected with resistance
R one end, the other end of the resistance R is connected with the resistance R2 other end, and the resistance R other end is connected to resistance
Rc, resistance Rb and resistance Rm one end, the other end of the resistance Rc are connected to crystal oscillator C2 one end and triode Q1
Colelctor electrode, the other end of the crystal oscillator C2 is connected with one end of loudspeaker Y 1, and the other end of loudspeaker Y 1 is connected with the another of power supply EC
One end, the basis set of the triode Q1 are connected to the resistance Rb other end and crystal oscillator C1 one end, and the crystal oscillator C1's is another
One end is connected with the resistance Rm other end, and the crystal oscillator C1 other end is connected with microphone MK one end, and the microphone MK's is another
End and triode Q1 transmitting collection are respectively connected with the power supply EC other end, and the microphone MK other end, triode Q1 transmitting collection
It is grounded with the other end of loudspeaker Y 1, the power supply EC is lithium battery, and the capacitance of the crystal oscillator C1 and crystal oscillator C2 are respectively 1uF
And 10uF, the resistance Rc, resistance Rb and resistance Rm resistance are respectively 2K, 30K and 185R, the triode Q1 and triode
P3 is silicone tube triode, and the crystal oscillator C1 and crystal oscillator C2 are ceramic crystal oscillator.
When electric current is less than setting value, resistance R1 provides triode P3 bias current, triode P3 saturation conductions, to electricity
Control action can not be flowed, when electric current is more than or equal to setting value, the pressure drop on resistance R increases, the pressure drop on resistance R and three poles
Pipe P3 knot pressures and the pressure drop close to resistance R2, then start to limit the electric currents that pass through of triode P3, protect Audio power amplifier
Electronic component in device, avoids electronic component from being damaged, and increases the service life of audio-frequency power amplifier, meets making for people
Use demand.
It is described above, the only preferable embodiment of the utility model, but the scope of protection of the utility model is not
This is confined to, any one skilled in the art is in the technical scope that the utility model discloses, according to this practicality
New technical scheme and its utility model design are subject to equivalent substitution or change, should all cover in protection model of the present utility model
Within enclosing.
Claims (6)
1. a kind of protection circuit of audio-frequency power amplifier, including power supply EC, it is characterised in that one end connection of the power supply EC
There is one end of switch, the other end of the switch is connected to triode P3 colelctor electrode and resistance R1 one end, the electricity
The resistance R1 other end is connected with triode P3 base stage and resistance R2 one end, and the emitter stage of the triode P3 is connected with resistance
R one end, the other end of the resistance R is connected with the resistance R2 other end, and the resistance R other end is connected to resistance
Rc, resistance Rb and resistance Rm one end, the other end of the resistance Rc are connected to crystal oscillator C2 one end and triode Q1
Colelctor electrode, the other end of the crystal oscillator C2 is connected with one end of loudspeaker Y 1, and the other end of loudspeaker Y 1 is connected with the another of power supply EC
One end, the basis set of the triode Q1 are connected to the resistance Rb other end and crystal oscillator C1 one end, and the crystal oscillator C1's is another
One end is connected with the resistance Rm other end, and the crystal oscillator C1 other end is connected with microphone MK one end, and the microphone MK's is another
End and triode Q1 transmitting collection are respectively connected with the power supply EC other end, and the microphone MK other end, triode Q1 transmitting collection
It is grounded with the other end of loudspeaker Y 1.
2. the protection circuit of a kind of audio-frequency power amplifier according to claim 1, it is characterised in that the power supply EC is
Lithium battery.
A kind of 3. protection circuit of audio-frequency power amplifier according to claim 1, it is characterised in that the crystal oscillator C1 and
Crystal oscillator C2 capacitance is respectively 1uF and 10uF.
A kind of 4. protection circuit of audio-frequency power amplifier according to claim 1, it is characterised in that the resistance Rc,
Resistance Rb and resistance Rm resistance are respectively 2K, 30K and 185R.
A kind of 5. protection circuit of audio-frequency power amplifier according to claim 1, it is characterised in that the triode Q1
It is silicone tube triode with triode P3.
A kind of 6. protection circuit of audio-frequency power amplifier according to claim 1, it is characterised in that the crystal oscillator C1 and
Crystal oscillator C2 is ceramic crystal oscillator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720407311.9U CN206865419U (en) | 2017-04-18 | 2017-04-18 | A kind of protection circuit of audio-frequency power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720407311.9U CN206865419U (en) | 2017-04-18 | 2017-04-18 | A kind of protection circuit of audio-frequency power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206865419U true CN206865419U (en) | 2018-01-09 |
Family
ID=60817850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720407311.9U Expired - Fee Related CN206865419U (en) | 2017-04-18 | 2017-04-18 | A kind of protection circuit of audio-frequency power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206865419U (en) |
-
2017
- 2017-04-18 CN CN201720407311.9U patent/CN206865419U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180109 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |