CN104333331B - Power-supplying method and device of audio power-amplifying circuit and audio playing equipment - Google Patents
Power-supplying method and device of audio power-amplifying circuit and audio playing equipment Download PDFInfo
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- CN104333331B CN104333331B CN201410628986.7A CN201410628986A CN104333331B CN 104333331 B CN104333331 B CN 104333331B CN 201410628986 A CN201410628986 A CN 201410628986A CN 104333331 B CN104333331 B CN 104333331B
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Abstract
The invention discloses a power-supplying method and a power-supplying device of an audio power-amplifying circuit and audio playing equipment, wherein the power-supplying device comprises a storage unit, a detecting circuit, a control unit and a power-supply module with adjustable power-supply voltage; the power-supply module is used for supplying power for the audio power-amplifying circuit; the storage unit is used for storing at least two groups of corresponding relations which respectively comprise preset output power which is output by the audio power-amplifying circuit and preset power-supplying voltage which is output by the power-supply module; the detecting circuit is used for detecting current output power in real time; the control unit is used for selecting the preset output power which is most approximate to and is greater than or equal to the current output power from the corresponding relations stored in the storage unit and regulating the current power-supplying voltage of the power-supply module into the preset power-supplying voltage corresponding to the selected preset output power. According to the power-supplying device, the deficiencies of lower power-amplifying efficiency and energy-source waste of an existing audio power-amplifying circuit are overcome, and the power-supplying device has the beneficial effect of enabling the power-amplifying efficiency of the audio power-amplifying circuit to be always kept the highest.
Description
Technical field
The present invention relates to the method for supplying power to and device and audio-frequence player device of a kind of audio power amplifier circuit.
Background technology
Existing audio power amplifier circuit is often powered using the power supply of fixed voltage, and this results in input to audio frequency power amplifier electricity
The supply voltage on road is fixed.And for audio power amplifier circuit, it is high during power amplification efficiency during using identical supply voltage
When it is low, the waste on the energy is especially caused when power amplification efficiency is low, reduce the use duration of power supply, also have impact on audio frequency
The performance of power amplifier itself.
The content of the invention
Present invention solves the technical problem that being to overcome the power amplification efficiency of prior art sound intermediate frequency power amplifier not high, making
Into energy waste, defect of the power supply using duration is reduced, there is provided a kind of that the power amplification efficiency of audio power amplifier circuit can be made to protect all the time
Hold the method for supplying power to and device and audio-frequence player device in highest audio power amplifier circuit.
The present invention is to solve above-mentioned technical problem by following technical proposals：
A kind of electric supply installation of audio power amplifier circuit, is characterized in, the electric supply installation includes a memory element, a detection
Circuit, a control unit and the adjustable power module of a supply voltage, the power module is used to be the audio power amplifier circuit
Power supply；The memory element is used to store at least two groups corresponding relations, and every group of corresponding relation includes respectively audio frequency power amplifier electricity
One default output of road output and a default supply voltage of power module output, the default supply voltage is used for
So that the power amplification efficiency of the audio power amplifier circuit reaches maximum, described power amplification efficiency etc. when the default output is exported
Output power when default output is powered divided by the power module using a supply voltage；The detection circuit
For detecting the present output power of the audio power amplifier circuit in real time；Described control unit is used to be deposited from the memory element
In the corresponding relation of storage, choose closest with the present output power and default more than or equal to the present output power
Output, and the current supply voltage of the power module is adjusted to corresponding with the default output being selected default
Supply voltage.
The technical program is by above-mentioned improvement so that the current supply voltage of the audio power amplifier circuit can be according to current
Output real-time change, has reached the effect for improving power amplification efficiency.
Preferably, the output power is equal to default output adds a loss power, the loss power is in institute
State the electric energy loss of audio power amplifier circuit when power module is powered using the supply voltage；The memory element is also
When being powered using different power voltage for being stored in the power module, the audio power amplifier circuit output is same default
Different electric energy losses during output；The memory element is additionally operable to calculate respectively the power module using different power supply electricity
When pressure is powered, the audio power amplifier circuit exports different power amplification efficiencies during same default output, and chooses power amplifier
The maximum supply voltage of efficiency is used as the default supply voltage.Wherein, the electric energy loss can pass through the audio frequency power amplifier
The product description of circuit or the test circuit of correlation are obtained.
Preferably, the detection circuit is used to detect the current output voltage of the audio power amplifier circuit in real time, and count
Present output power is calculated, the present output power is equal to square the bearing divided by the audio power amplifier circuit of current output voltage
The resistance of load.The current output voltage and the load can be obtained by existing means.
Preferably, the power module include a DC-DC converter (it is a kind of in DC circuit by the electricity of a magnitude of voltage
The device of the electric energy of another magnitude of voltage can be changed into).
A kind of audio-frequence player device, is characterized in, including above-mentioned audio power amplifier circuit and above-mentioned each preferred tune condition are appointed
Anticipate a kind of electric supply installation of combination.The audio-frequence player device is not limited to MP3 (a kind of music player), radio etc. only
The equipment that audio frequency can be played, also includes the miscellaneous equipment with audio playing function, such as mobile terminal, TV.
A kind of method of supplying power to of audio power amplifier circuit, is characterized in, the method for supplying power to utilizes above-mentioned electric supply installation reality
It is existing, comprise the following steps：
S1, at least two groups corresponding relations of storage, every group of corresponding relation preset respectively including the one of the audio power amplifier circuit
Output and a default supply voltage of power module output, the default supply voltage is used to cause exporting described
The power amplification efficiency of the audio power amplifier circuit reaches maximum during default output, and the power amplification efficiency is equal to default output
Output power when being powered using a supply voltage divided by the power module；
S2, in real time detect the present output power of the audio power amplifier circuit；
S3, from S1In the corresponding relation of storage, choose closest with the present output power and work as more than or equal to described
The default output of front output；
S4, the current supply voltage of the power module is adjusted to it is corresponding with the default output being selected default
Supply voltage.
Preferably, the output power is equal to default output adds a loss power, the loss power is in institute
State the electric energy loss of audio power amplifier circuit when power module is powered using the supply voltage；
Step S1Also include before：
S01, when being stored in the power module and being powered using different power voltage, the audio power amplifier circuit output
Different electric energy losses during same default output；
S02, when calculating the power module and be powered using different power voltage respectively, the audio power amplifier circuit is defeated
Go out different power amplification efficiencies during same default output, and choose power amplification efficiency it is maximum when supply voltage as default power supply
Voltage.
Preferably, S2Including：
S21, in real time detect the current output voltage of the audio power amplifier circuit；
S22, calculate present output power, the present output power be equal to current output voltage square divided by the sound
The resistance of the load of frequency power amplifier.
Preferably, the power module includes a DC-DC converter.
On the basis of common sense in the field is met, above-mentioned each optimum condition, can combination in any, obtain final product each preferable reality of the present invention
Example.
The present invention positive effect be：The method of supplying power to and device of the audio power amplifier circuit of the present invention and audio frequency are broadcast
Equipment is put by automatically adjusting the supply voltage of the audio power amplifier circuit so that the power amplification efficiency of the audio power amplifier circuit is big
Big to improve, the beneficial effect with energy saving, prolongation power module use time further increases the audio frequency power amplifier electricity
The performance on road itself.
Description of the drawings
Fig. 1 is the structural representation of the audio-frequence player device of embodiments of the invention.
Fig. 2 for embodiments of the invention audio power amplifier circuit supply voltage be 2.6V and load for 8 Ω when output work
Rate-electric energy loss curve.
Fig. 3 for embodiments of the invention audio power amplifier circuit supply voltage be 3V and load for 8 Ω when output work
Rate-electric energy loss curve.
Fig. 4 for embodiments of the invention audio power amplifier circuit supply voltage be 5V and load for 8 Ω when output work
Rate-electric energy loss curve.
Fig. 5 is the flow chart of the method for supplying power to of embodiments of the invention.
Specific embodiment
The present invention is further illustrated below by the mode of embodiment, but does not therefore limit the present invention to described reality
Among applying a scope.
Embodiment
A kind of audio-frequence player device, it belongs to a mobile phone, referring to Fig. 1, including an audio power amplifier circuit 1 and the audio frequency work(
One electric supply installation 2 on electric discharge road 1.
The audio power amplifier circuit 1 is used to amplify and export audio frequency, U by an input audio frequencyout=nUin, wherein
UoutFor the voltage of the output audio frequency, UinFor the voltage of the input audio frequency, n is the times magnification of the audio power amplifier circuit 1
Number.
The electric supply installation 2 includes the detection circuit 22 of a memory element 21, a control unit 23 and a power module
24.The audio power amplifier circuit 1 is connected respectively with the detection circuit 22 and the power module 24, the detection He of circuit 22
The power module 24 is also connected with described control unit 23 respectively, described control unit 23 also with the phase of the memory element 21
Even.
The power module 24 is used to be powered for the audio power amplifier circuit 1, and the power module 24 includes a DC-
DC changers, so that the supply voltage of the power module 24 is adjustable.
In the present embodiment, the computing formula of the power amplification efficiency η of the audio power amplifier circuit 1 is as follows：
Wherein, P0To preset output, PinA supply voltage is exported for the power module 24
When output power；
Pin=P0+P1, wherein, P1For a loss power, the loss power is to adopt a power supply in the power module 24
The electric energy loss of the audio power amplifier circuit 1 when voltage is powered；
I.e.
The memory element 21 include a memorizer, for set 3 default outputs, respectively 0.1W, 0.2W and
0.3W, is additionally operable to be stored in the audio power amplifier circuit 1 when the power module 24 is powered using different power voltage defeated
Go out the different electric energy losses of same default output, and calculate the power module 24 respectively is carried out using different power voltage
During power supply, the audio power amplifier circuit 1 exports different power amplification efficiencies during same default output.By Fig. 2, Fig. 3 and Fig. 4
Shown curve, using above-mentioned formula, we can know table 1：
Table 1
The memory element 21 be additionally operable to choose power amplification efficiency it is maximum when supply voltage as the default supply voltage,
And the default output and the default supply voltage are stored as into one group of corresponding relation.From table 1, we can obtain table
Three groups of corresponding relations in 2 are stored for the memory element 21.
Table 2
| Default output (W) | 0.1 | 0.2 | 0.3 |
| Default supply voltage (V) | 2.6 | 2.6 | 2.6 |
It should be noted that, although the default supply voltage in table 2 is 2.6V, but do not indicate that and all default output works
The corresponding default supply voltage of rate is 2.6V.The setting of the default output in addition can be according to audio frequency power amplifier electricity
Realizing, such as the scope of the output of the audio power amplifier circuit 1 is 0～2W to the scope of the output on road 1, to setting
5 default outputs, then can with it is equally spaced choose default output be respectively 0.4W, 0.8W, 1.2W, 1.6W and
2W。
It is described to detect that circuit 22 is used to detect the present output power of the audio power amplifier circuit 1 in real time, specifically for
Current output voltage (the voltage U of i.e. described output audio frequency of the audio power amplifier circuit 1 is detected in real timeout), and calculate corresponding
Present output power Pout,
Wherein, RLFor the resistance of the load of the audio power amplifier circuit 1.
Described control unit 23 is a microprocessor, in the corresponding relation that store from the memory element 21, selection
With the present output power closest to and more than or equal to the default output of the present output power, and by described
DC-DC converter is adjusted to the current supply voltage of the power module 24 corresponding pre- with the default output being selected
If supply voltage.As it is described detection circuit 22 detect current output voltage for 1.2V and load for 8 Ω when, present output power
For 0.18W, described control unit 23 chooses corresponding relation of the default output for 0.2W, and working as the power module 24
Front supply voltage is adjusted to 2.6V.
The method of supplying power to of the audio power amplifier circuit 1 of the present embodiment, is realized using the electric supply installation 2, referring to Fig. 5, including
Following steps：
Step 301, respectively 3 default outputs of setting, 0.1W, 0.2W and 0.3W.
Step 302, when being stored in the power module 24 and being powered using different power voltage, the audio frequency power amplifier electricity
Road 1 exports different electric energy losses during same default output.
Step 303, when calculating the power module 24 respectively and being powered using different power voltage, the audio frequency power amplifier
Circuit 1 exports different power amplification efficiencies during same default output.
By step 301- step 303, table 1 is obtained.
Step 304, choose the maximum supply voltage of power amplification efficiency as default supply voltage, and by default output and
Default supply voltage is stored as one group of corresponding relation.
Three groups of corresponding relations of table 2 are obtained by step 304.
Step 305, the current output voltage for detecting the audio power amplifier circuit 1 in real time, and calculate corresponding current defeated
Go out power.
In step 306, the corresponding relation stored from step 304, choose closest with the present output power and be more than
Or equal to the default output of the present output power.
Step 307, by the DC-DC converter by the current supply voltage of the power module 24 be adjusted to it is selected
The corresponding default supply voltage of default output for taking.
Although the foregoing describing the specific embodiment of the present invention, it will be appreciated by those of skill in the art that these
It is merely illustrative of, protection scope of the present invention is defined by the appended claims.Those skilled in the art is not carrying on the back
On the premise of the principle and essence of the present invention, various changes or modifications can be made to these embodiments, but these are changed
Protection scope of the present invention is each fallen within modification.
Claims (9)
1. a kind of electric supply installation of audio power amplifier circuit, it is characterised in that the electric supply installation includes a memory element, a detection
Circuit, a control unit and the adjustable power module of a supply voltage, the power module is used to be the audio power amplifier circuit
Power supply；
The memory element is used to store at least two groups corresponding relations, and every group of corresponding relation includes respectively the audio power amplifier circuit
The default output of the one of output and a default supply voltage of power module output, the default supply voltage is used to make
The power amplification efficiency for obtaining the audio power amplifier circuit when the default output is exported reaches maximum, and the power amplification efficiency is equal to
Output power when default output is powered divided by the power module using a supply voltage；
The detection circuit is used to detect the present output power of the audio power amplifier circuit in real time；
Described control unit is used for from the corresponding relation of memory element storage, and selection most connects with the present output power
Closely and more than or equal to the default output of the present output power, and by the current supply voltage of the power module adjust
Section is default supply voltage corresponding with the default output being selected.
2. electric supply installation as claimed in claim 1, it is characterised in that the output power is equal to default output and adds
Loss power, the loss power is the audio power amplifier circuit when the power module is powered using a supply voltage
Electric energy loss；
The memory element is additionally operable to be stored in the power module when being powered using different power voltage, the audio frequency work(
Put different electric energy losses during the same default output of circuit output；
The memory element is additionally operable to calculate the power module respectively when being powered using different power voltage, the audio frequency
Power amplifier exports different power amplification efficiencies during same default output, and chooses the maximum supply voltage conduct of power amplification efficiency
The default supply voltage.
3. electric supply installation as claimed in claim 1 or 2, it is characterised in that the detection circuit is used to detect described in real time
The current output voltage of audio power amplifier circuit, and present output power is calculated, the present output power is equal to current output electricity
Pressure square divided by the audio power amplifier circuit load resistance.
4. electric supply installation as claimed in claim 1, it is characterised in that the power module includes a DC-DC converter.
5. a kind of audio-frequence player device, it is characterised in that including audio power amplifier circuit and such as any one institute in claim 1-4
The electric supply installation stated.
6. a kind of method of supplying power to of audio power amplifier circuit, it is characterised in that the method for supplying power to is using as claimed in claim 1
Electric supply installation is realized, comprised the following steps：
S1, at least two groups corresponding relations of storage, every group of corresponding relation is respectively including a default output work of the audio power amplifier circuit
Rate and a default supply voltage of power module output, the default supply voltage is used to cause exporting described default defeated
The power amplification efficiency of the audio power amplifier circuit reaches maximum when going out power, and the power amplification efficiency is equal to default output divided by institute
State output power when power module is powered using a supply voltage；
S2, in real time detect the present output power of the audio power amplifier circuit；
S3, from S1In the corresponding relation of storage, choose closest with the present output power and current defeated more than or equal to described
Go out the default output of power；
S4, the current supply voltage of the power module is adjusted to into default power supply corresponding with the default output being selected
Voltage.
7. method of supplying power to as claimed in claim 6, it is characterised in that the output power is equal to default output and adds
Loss power, the loss power is the audio power amplifier circuit when the power module is powered using a supply voltage
Electric energy loss；
Step S1Also include before：
S01, when being stored in the power module and being powered using different power voltage, the audio power amplifier circuit output is same
Different electric energy losses during default output；
S02, when calculating the power module and be powered using different power voltage respectively, the audio power amplifier circuit output is same
Different power amplification efficiencies during one default output, and supply voltage when choosing power amplification efficiency maximum is used as default electricity of powering
Pressure.
8. method of supplying power to as claimed in claims 6 or 7, it is characterised in that S2Including：
S21, in real time detect the current output voltage of the audio power amplifier circuit；
S22, calculate present output power, the present output power be equal to current output voltage square divided by the audio frequency work(
The resistance of the load on electric discharge road.
9. method of supplying power to as claimed in claim 6, it is characterised in that the power module includes a DC-DC converter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410628986.7A CN104333331B (en) | 2014-11-10 | 2014-11-10 | Power-supplying method and device of audio power-amplifying circuit and audio playing equipment |
Applications Claiming Priority (1)
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|---|---|---|---|
| CN201410628986.7A CN104333331B (en) | 2014-11-10 | 2014-11-10 | Power-supplying method and device of audio power-amplifying circuit and audio playing equipment |
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| CN104333331A CN104333331A (en) | 2015-02-04 |
| CN104333331B true CN104333331B (en) | 2017-04-19 |
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| CN201410628986.7A Active CN104333331B (en) | 2014-11-10 | 2014-11-10 | Power-supplying method and device of audio power-amplifying circuit and audio playing equipment |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104967945B (en) * | 2015-06-03 | 2019-06-18 | Oppo广东移动通信有限公司 | A kind of control method of earphone power amplifier and earphone power amplifier |
| US10498306B1 (en) | 2018-07-02 | 2019-12-03 | Roku, Inc. | Intelligent power reduction in audio amplifiers |
| CN112995853B (en) * | 2021-02-25 | 2023-01-20 | 歌尔科技有限公司 | Sound box and control method and power supply control circuit thereof |
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Address after: Building 1, No. 399 Keyuan Road, Zhangjiang hi tech park, Pudong New Area, Shanghai, 201203 Patentee after: Huaqin Technology Co.,Ltd. Address before: 201203 Building 1, 399 Zhangyuan Road, Zhangjiang, Pudong New Area, Shanghai Patentee before: HUAQIN TELECOM TECHNOLOGY Co.,Ltd. |