CN207743942U - A kind of energy-saving circuit for power amplifier - Google Patents
A kind of energy-saving circuit for power amplifier Download PDFInfo
- Publication number
- CN207743942U CN207743942U CN201820163598.XU CN201820163598U CN207743942U CN 207743942 U CN207743942 U CN 207743942U CN 201820163598 U CN201820163598 U CN 201820163598U CN 207743942 U CN207743942 U CN 207743942U
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- China
- Prior art keywords
- circuit
- power
- power amplifier
- switching circuit
- control unit
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- Expired - Fee Related
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- 238000001514 detection method Methods 0.000 claims abstract description 18
- 230000005611 electricity Effects 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims description 8
- 230000005236 sound signal Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model is related to sound technique field more particularly to a kind of energy-saving circuits for power amplifier.It includes：The power input AUDIO of power amplifier, power end VCC, for detecting the detection circuit of vision signal, switching circuit and control unit in power amplifier；Power end VCC is connect by switching circuit with power input AUDIO, and the signal end of control unit is electrically connected with detection circuit, and the control terminal of control unit is electrically connected with switching circuit and controls the break-make of switching circuit；And then control the connection of power end VCC and power input AUDIO.The utility model controls whether the power input of power amplifier can connect electricity by the way that switching circuit is arranged, and the working condition of switching circuit is determined by detection circuit, so that power amplifier is powered off when no audio signal inputs, saves electric energy.
Description
Technical field
The utility model is related to sound technique field more particularly to a kind of energy-saving circuits for power amplifier.
Background technology
As the improvement of people's living standards, people are higher and higher to the pursuit of quality of the life, current many electronic products
All carry power amplifier function, such as MP3, MP4, mobile phone；These electronic products are when using power amplifier function, even if believing without sound
Number, power amplifier is also always maintained at work, and since these electronic products are typically all built-in power supply, electricity is very limited, work(
The invalid acting of energy circuit can waste a part of electric energy, shorten usage time.
Invention content
The purpose of this utility model is that in view of the deficiencies of the prior art, providing a kind of electricity-saving for power amplifier
Road, the energy-saving circuit.
A kind of energy-saving circuit for power amplifier, including：The power input AUDIO of power amplifier, power end VCC,
For detecting the detection circuit of vision signal, switching circuit and control unit in power amplifier；
Power end VCC is connect by switching circuit with power input AUDIO, the signal end and detection circuit of control unit
Electrical connection, the control terminal of control unit are electrically connected with switching circuit and control the break-make of switching circuit；And then control power end VCC
With the connection of power input AUDIO.
When there is vision signal input in power amplifier, control unit controls switching circuit conducting, power end VCC and power supply
Input terminal AUDIO conductings, power amplifier normal work；When not having vision signal input in power amplifier, detection circuit is to control
Unit processed sends out detection signal, and control unit controls switching circuit and changes state, and makes power end VCC and power input
Open circuit is formed between AUDIO, power amplifier is stopped.
Further, power end VCC is connected with preceding filter circuit, and preceding filter circuit includes the shunt capacitance C6 and electricity of ground connection
Hold C54, and the resistance R80 with switching circuit in series.
Further, power input AUDIO is connected with post filtering circuit, and post filtering circuit includes and switching circuit in series
Capacitance C121 and resistance R109, the wherein both ends of resistance R109 pass through capacitance C120 and resistance R108 ground connection respectively.
Further, the switching circuit includes triode Q8, and the collector of triode Q8 connects with the output end of resistance R80
It connects, the emitter of triode Q8 is grounded by resistance R103, and the base stage of triode Q8 is single with control by capacitance C24, resistance R81
Member connection.
Further, the detection circuit includes operational amplifier U1, and a reference edge of operational amplifier U1 is connected with
The other end of reference voltage, operational amplifier U1 is connected by two audio input ends of resistance R3, R4 and power amplifier respectively,
The output end of operational amplifier U1 is connect with control unit.
Further, control unit is connected with control switch SW.
The beneficial effects of the utility model：The utility model is defeated come the power supply for controlling power amplifier by the way that switching circuit is arranged
Enter whether end can connect electricity, the working condition of switching circuit is determined by detection circuit, so that power amplifier is believed in no audio
Number input when power off, save electric energy.
Description of the drawings
Fig. 1 is a kind of circuit diagram of the present embodiment.
Fig. 2 is a kind of schematic diagram of the detection circuit of the present embodiment.
Specific implementation mode
The utility model is described in detail below in conjunction with attached drawing.As shown in Figure 1.
Embodiment：A kind of energy-saving circuit for power amplifier, including：Power input AUDIO, the power supply of power amplifier
Hold VCC, for detecting the detection circuit of vision signal, switching circuit and control unit in power amplifier；And then control power supply
Hold the connection of VCC and power input AUDIO.
Power end VCC is connect by switching circuit with power input AUDIO, the signal end and detection circuit of control unit
Electrical connection, the control terminal of control unit are electrically connected with switching circuit and control the break-make of switching circuit；
When there is vision signal input in power amplifier, control unit controls switching circuit conducting, power end VCC and power supply
Input terminal AUDIO conductings, power amplifier normal work；When not having vision signal input in power amplifier, detection circuit is to control
Unit processed sends out detection signal, and control unit controls switching circuit and changes state, and makes power end VCC and power input
Open circuit is formed between AUDIO, power amplifier is stopped.
In the technical program, judge whether power amplifier needs work by detecting the audio signal of power amplifier, when
When having audio signal, switching circuit normal work, power amplifier work；Otherwise, control unit control switching circuit changes state,
Power amplifier is stopped, and saves electric energy.Available circuit may be used in switching circuit, can also be switch element, such as switching tube,
Such as triode or metal-oxide-semiconductor etc..
Further, power end VCC is connected with preceding filter circuit, and preceding filter circuit includes the shunt capacitance C6 and electricity of ground connection
Hold C54, and the resistance R80 with switching circuit in series.
Resistance R80 in preceding filter circuit and formation RC filter circuits between shunt capacitance, carry out filtering early period.
Further, power input AUDIO is connected with post filtering circuit, and post filtering circuit includes and switching circuit in series
Capacitance C121 and resistance R109, the wherein both ends of resistance R109 pass through capacitance C120 and resistance R108 ground connection respectively.
Also RC filter circuits are formed in post filtering circuit, are filtered for the operating voltage to power amplifier, are ensured its stabilization
Work.
Further, the switching circuit includes triode Q8, and the collector of triode Q8 connects with the output end of resistance R80
It connects, the emitter of triode Q8 is grounded by resistance R103, and the base stage of triode Q8 is single with control by capacitance C24, resistance R81
Member connection.
The conducting of power input AUDIO and power end VCC are controlled by triode Q8.
Further, the detection circuit includes operational amplifier U1, and a reference edge of operational amplifier U1 is connected with
The other end of reference voltage, operational amplifier U1 is connected by two audio input ends of resistance R3, R4 and power amplifier respectively,
The output end of operational amplifier U1 is connect with control unit.
In the present embodiment, by providing reference voltage between concatenated resistance R1, resistance R2 connections and power supply and ground, transport
It calculates amplifier U1 and control unit is sent a signal to by comparison, control unit can be MCU, control IC etc.；Control unit root
It is judged that result sends control signal to switching circuit, to control the break-make of switching circuit.
Further, control unit is connected with control switch SW.
Control the startup that switch SW is used for power amplifier.When controlling switch SW closures, regardless of whether detecting that audio is believed
Number, control unit controls switching circuit and changes state, and power end VCC is connected with power input AUDIO.
The above content is only the preferred embodiment of the utility model, for those of ordinary skill in the art, according to this reality
With novel thought, there will be changes in the specific implementation manner and application range, and the content of the present specification should not be construed as
Limitations of the present invention.
Claims (6)
1. a kind of energy-saving circuit for power amplifier, it is characterised in that：Including：Power input AUDIO, the electricity of power amplifier
Source VCC, for detecting the detection circuit of vision signal, switching circuit and control unit in power amplifier；
Power end VCC is connect by switching circuit with power input AUDIO, and signal end and the detection circuit of control unit are electrically connected
It connects, the control terminal of control unit is electrically connected with switching circuit and controls the break-make of switching circuit, and then controls power end VCC and electricity
The connection of source input terminal AUDIO.
2. a kind of energy-saving circuit for power amplifier according to claim 1, it is characterised in that：Power end VCC connections
It includes the shunt capacitance C6 and capacitance C54 of ground connection, and the resistance with switching circuit in series to have preceding filter circuit, preceding filter circuit
R80。
3. a kind of energy-saving circuit for power amplifier according to claim 2, it is characterised in that：Power input
AUDIO is connected with post filtering circuit, and post filtering circuit includes the capacitance C121 and resistance R109 with switching circuit in series, wherein electricity
The both ends of R109 are hindered respectively by capacitance C120 and resistance R108 ground connection.
4. a kind of energy-saving circuit for power amplifier according to claim 3, it is characterised in that：The switching circuit packet
Triode Q8 is included, the collector of triode Q8 is connect with the output end of resistance R80, and the emitter of triode Q8 passes through resistance R103
Ground connection, the base stage of triode Q8 are connect by capacitance C24, resistance R81 with control unit.
5. a kind of energy-saving circuit for power amplifier according to claim 4, it is characterised in that：The detection circuit packet
Operational amplifier U1 is included, a reference edge of operational amplifier U1 is connected with reference voltage, the other end point of operational amplifier U1
It is not connected by two audio input ends of resistance R3, R4 and power amplifier, the output end and control unit of operational amplifier U1
Connection.
6. a kind of energy-saving circuit for power amplifier according to claim 5, it is characterised in that：Control unit is connected with
Control switch SW.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820163598.XU CN207743942U (en) | 2018-01-31 | 2018-01-31 | A kind of energy-saving circuit for power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820163598.XU CN207743942U (en) | 2018-01-31 | 2018-01-31 | A kind of energy-saving circuit for power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207743942U true CN207743942U (en) | 2018-08-17 |
Family
ID=63124146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820163598.XU Expired - Fee Related CN207743942U (en) | 2018-01-31 | 2018-01-31 | A kind of energy-saving circuit for power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207743942U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114296538A (en) * | 2021-12-07 | 2022-04-08 | 广东虹勤通讯技术有限公司 | Electronic equipment power amplifier power supply control circuit and electronic equipment |
-
2018
- 2018-01-31 CN CN201820163598.XU patent/CN207743942U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114296538A (en) * | 2021-12-07 | 2022-04-08 | 广东虹勤通讯技术有限公司 | Electronic equipment power amplifier power supply control circuit and electronic equipment |
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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: 20180817 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |