CN104333331A - 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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- CN104333331A CN104333331A CN201410628986.7A CN201410628986A CN104333331A CN 104333331 A CN104333331 A CN 104333331A CN 201410628986 A CN201410628986 A CN 201410628986A CN 104333331 A CN104333331 A CN 104333331A
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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 a kind of method of supplying power to of audio power amplifier circuit and device and audio-frequence player device.
Background technology
Existing audio power amplifier circuit often adopts the Power supply of fixed voltage, and this is fixing with regard to causing the supply power voltage inputing to audio power amplifier circuit.And for audio power amplifier circuit, when adopting identical supply power voltage, low during height during power amplification efficiency, especially cause the waste on the energy when power amplification efficiency is low, decrease the use duration of power supply, also have impact on the performance of audio power amplifier circuit self.
Summary of the invention
The technical problem that the present invention solves is that the power amplification efficiency in order to overcome prior art sound intermediate frequency power amplifier is not high, cause energy waste, reduce power supply and use the defect of duration, provide a kind of the power amplification efficiency of audio power amplifier circuit can be made to remain at the highest audio power amplifier circuit method of supplying power to and device and audio-frequence player device.
The present invention is solved the problems of the technologies described above by following technical proposals:
An electric supply installation for audio power amplifier circuit, is characterized in, described electric supply installation comprises the adjustable power module of a memory cell, a testing circuit, a control unit and a supply power voltage, and described power module is used for powering for described audio power amplifier circuit; Described memory cell is used for storing at least two group corresponding relations, often organize corresponding relation and comprise the default supply power voltage that power output and the output of described power module are preset in one of described audio power amplifier circuit output respectively, the power amplification efficiency that described default supply power voltage is provided for the described audio power amplifier circuit when exporting described default power output reaches maximum, and described power amplification efficiency equals output power when default power output adopts a supply power voltage to power divided by described power module; Described testing circuit is used for the present output power detecting described audio power amplifier circuit in real time; Described control unit is used for from the corresponding relation of described cell stores, choose with described present output power closest to and be more than or equal to the default power output of described present output power, and the current supply power voltage of described power module is adjusted to the default supply power voltage corresponding with the default power output be selected.
The technical program, by above-mentioned improvement, makes the current supply power voltage of described audio power amplifier circuit according to present output power real-time change, can reach the effect improving power amplification efficiency.
Preferably, described output power equals default power output and adds a loss power, and described loss power is the electric energy loss of the described audio power amplifier circuit when described power module adopts described supply power voltage to power; Described memory cell also for be stored in described power module adopt different power voltage to power time, described audio power amplifier circuit exports different electric energy losses during same default power output; Described memory cell also for calculate respectively described power module adopt different power voltage power time, described audio power amplifier circuit exports different power amplification efficiencies during same default power output, and chooses the maximum supply power voltage of power amplification efficiency as described default supply power voltage.Wherein, described electric energy loss can be obtained by the product description of described audio power amplifier circuit or relevant test circuit.
Preferably, described testing circuit is used for detecting the current output voltage of described audio power amplifier circuit in real time, and calculates present output power, described present output power equal current output voltage square divided by the resistance of the load of described audio power amplifier circuit.Described current output voltage and described load all can be obtained by existing means.
Preferably, described power module comprises a DC-DC converter (a kind of device electric energy of a magnitude of voltage being become the electric energy of another magnitude of voltage in DC circuit).
A kind of audio-frequence player device, is characterized in, comprises the electric supply installation of above-mentioned audio power amplifier circuit and any one combination of above-mentioned each preferred tune condition.Described audio-frequence player device is not limited to MP3 (a kind of music player), broadcast receiver etc. can only the equipment of audio plays, also comprises the miscellaneous equipment with audio playing function, as mobile terminal, TV etc.
A method of supplying power to for audio power amplifier circuit, is characterized in, described method of supplying power to utilizes above-mentioned electric supply installation to realize, and comprises the following steps:
S
1, store at least two group corresponding relations, often organize corresponding relation and comprise the default supply power voltage that one of described audio power amplifier circuit presets power output and the output of described power module respectively, the power amplification efficiency that described default supply power voltage is provided for the described audio power amplifier circuit when exporting described default power output reaches maximum, and described power amplification efficiency equals output power when default power output adopts a supply power voltage to power divided by described power module;
S
2, detect the present output power of described audio power amplifier circuit in real time;
S
3, from S
1in the corresponding relation stored, choose with described present output power closest to and be more than or equal to the default power output of described present output power;
S
4, the current supply power voltage of described power module is adjusted to the default supply power voltage corresponding with the default power output be selected.
Preferably, described output power equals default power output and adds a loss power, and described loss power is the electric energy loss of the described audio power amplifier circuit when described power module adopts described supply power voltage to power;
Step S
1also comprise before:
S
01, be stored in described power module and adopt different power voltage when powering, described audio power amplifier circuit exports different electric energy losses during same default power output;
S
02, calculate described power module respectively and adopt different power voltage when powering, described audio power amplifier circuit exports different power amplification efficiencies during same default power output, and choose power amplification efficiency maximum time supply power voltage as default supply power voltage.
Preferably, S
2comprise:
S
21, detect the current output voltage of described audio power amplifier circuit in real time;
S
22, calculate present output power, described present output power equal current output voltage square divided by the resistance of the load of described audio power amplifier circuit.
Preferably, described power module comprises a DC-DC converter.
On the basis meeting this area general knowledge, above-mentioned each optimum condition, can combination in any, obtains the preferred embodiments of the invention.
Positive progressive effect of the present invention is: the method for supplying power to of audio power amplifier circuit of the present invention and device and audio-frequence player device are by automatically regulating the supply power voltage of described audio power amplifier circuit, the power amplification efficiency of described audio power amplifier circuit is improved greatly, the beneficial effect have energy savings, extending power module service time, further increases the performance of described audio power amplifier circuit self.
Accompanying drawing explanation
Fig. 1 is the structural representation of the audio-frequence player device of embodiments of the invention.
Fig. 2 is audio power amplifier circuit power output-electric energy loss curve when supply power voltage is 2.6V and load is 8 Ω of embodiments of the invention.
Fig. 3 is audio power amplifier circuit power output-electric energy loss curve when supply power voltage is 3V and load is 8 Ω of embodiments of the invention.
Fig. 4 is audio power amplifier circuit power output-electric energy loss curve when supply power voltage is 5V and load is 8 Ω of embodiments of the invention.
Fig. 5 is the flow chart of the method for supplying power to of embodiments of the invention.
Embodiment
Mode below by embodiment further illustrates the present invention, but does not therefore limit the present invention among described scope of embodiments.
Embodiment
A kind of audio-frequence player device, it belongs to a mobile phone, see Fig. 1, comprises an electric supply installation 2 of an audio power amplifier circuit 1 and described audio power amplifier circuit 1.
Described audio power amplifier circuit 1 is for amplifying an input audio frequency and export an output audio, U
out=nU
in, wherein U
outfor the voltage of described output audio, U
infor the voltage of described input audio frequency, n is the multiplication factor of described audio power amplifier circuit 1.
Described electric supply installation 2 comprises memory cell 21, testing circuit 22, control unit 23 and a power module 24.Described audio power amplifier circuit 1 is connected with described power module 24 with described testing circuit 22 respectively, and described testing circuit 22 is also connected with described control unit 23 respectively with described power module 24, and described control unit 23 is also connected with described memory cell 21.
Described power module 24 is for powering for described audio power amplifier circuit 1, and described power module 24 comprises a DC-DC converter, to make the supply power voltage of described power module 24 adjustable.
In the present embodiment, the computing formula of the power amplification efficiency η of described audio power amplifier circuit 1 is as follows:
wherein, P
0for default power output, P
infor output power when described power module 24 exports a supply power voltage;
P
in=P
0+ P
1, wherein, P
1be a loss power, described loss power is the electric energy loss of the described audio power amplifier circuit 1 when described power module 24 adopts a supply power voltage to power;
Namely
Described memory cell 21 comprises a memory, for setting 3 default power outputs, be respectively 0.1W, 0.2W and 0.3W, also export the different electric energy losses of same default power output for being stored in described audio power amplifier circuit 1 when described power module 24 adopts different power voltage to power, and calculating described power module 24 respectively when adopting different power voltage to power, described audio power amplifier circuit 1 exports different power amplification efficiencies during same default power output.By the curve shown in Fig. 2, Fig. 3 and Fig. 4, utilize above-mentioned formula, we can know table 1:
Table 1
Described memory cell 21 also for choose power amplification efficiency maximum time supply power voltage as described default supply power voltage, and described default power output and described default supply power voltage are stored as one group of corresponding relation.From table 1, three groups of corresponding relations that we can obtain in table 2 store for described memory cell 21.
Table 2
| Preset power output (W) | 0.1 | 0.2 | 0.3 |
| Preset supply power voltage (V) | 2.6 | 2.6 | 2.6 |
It should be noted that, although the default supply power voltage in table 2 is 2.6V, do not represent that the default supply power voltage corresponding with all default power outputs is 2.6V.The setting of described default power output can realize according to the scope of the power output of described audio power amplifier circuit 1 in addition, as as described in the scope of power output of audio power amplifier circuit 1 be 0 ~ 2W, to set 5 default power outputs, so equally spacedly can choose default power output and being respectively 0.4W, 0.8W, 1.2W, 1.6W and 2W.
Described testing circuit 22 for detecting the present output power of described audio power amplifier circuit 1 in real time, specifically for detecting current output voltage (the i.e. voltage U of described output audio of described audio power amplifier circuit 1 in real time
out), and calculate corresponding present output power P
out,
wherein, R
lfor the resistance of the load of described audio power amplifier circuit 1.
Described control unit 23 is a microprocessor, for in the corresponding relation from described memory cell 21 storage, choose with described present output power closest to and be more than or equal to the default power output of described present output power, and by described DC-DC converter, the current supply power voltage of described power module 24 is adjusted to the default supply power voltage corresponding with the default power output be selected.As described in testing circuit 22 detect that current output voltage is 1.2V and load is 8 Ω time, present output power is 0.18W, described control unit 23 chooses the corresponding relation that default power output is 0.2W, and the current supply power voltage of described power module 24 is adjusted to 2.6V.
The method of supplying power to of the audio power amplifier circuit 1 of the present embodiment, utilizes described electric supply installation 2 to realize, see Fig. 5, comprises the following steps:
Step 301, setting 3 default power outputs, be respectively 0.1W, 0.2W and 0.3W.
Step 302, be stored in described power module 24 when adopting different power voltage to power, described audio power amplifier circuit 1 exports different electric energy losses during same default power output.
Step 303, calculate described power module 24 when adopting different power voltage to power respectively, described audio power amplifier circuit 1 exports different power amplification efficiencies during same default power output.
By step 301-step 303, obtain table 1.
Step 304, choose the maximum supply power voltage of power amplification efficiency as default supply power voltage, and default power output and default supply power voltage are stored as one group of corresponding relation.
Three groups of corresponding relations of table 2 are obtained by step 304.
Step 305, detect the current output voltage of described audio power amplifier circuit 1 in real time, and calculate corresponding present output power.
Step 306, from the corresponding relation that step 304 stores, choose with described present output power closest to and be more than or equal to the default power output of described present output power.
Step 307, by described DC-DC converter, the current supply power voltage of described power module 24 is adjusted to the default supply power voltage corresponding with the default power output be selected.
Although the foregoing describe the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, protection scope of the present invention is defined by the appended claims.Those skilled in the art, under the prerequisite not deviating from principle of the present invention and essence, can make various changes or modifications to these execution modes, but these change and amendment all falls into protection scope of the present invention.
Claims (9)
1. an electric supply installation for audio power amplifier circuit, is characterized in that, described electric supply installation comprises the adjustable power module of a memory cell, a testing circuit, a control unit and a supply power voltage, and described power module is used for powering for described audio power amplifier circuit;
Described memory cell is used for storing at least two group corresponding relations, often organize corresponding relation and comprise the default supply power voltage that power output and the output of described power module are preset in one of described audio power amplifier circuit output respectively, the power amplification efficiency that described default supply power voltage is provided for the described audio power amplifier circuit when exporting described default power output reaches maximum, and described power amplification efficiency equals output power when default power output adopts a supply power voltage to power divided by described power module;
Described testing circuit is used for the present output power detecting described audio power amplifier circuit in real time;
Described control unit is used for from the corresponding relation of described cell stores, choose with described present output power closest to and be more than or equal to the default power output of described present output power, and the current supply power voltage of described power module is adjusted to the default supply power voltage corresponding with the default power output be selected.
2. electric supply installation as claimed in claim 1, it is characterized in that, described output power equals default power output and adds a loss power, and described loss power is the electric energy loss of the described audio power amplifier circuit when described power module adopts described supply power voltage to power;
Described memory cell also for be stored in described power module adopt different power voltage to power time, described audio power amplifier circuit exports different electric energy losses during same default power output;
Described memory cell also for calculate respectively described power module adopt different power voltage power time, described audio power amplifier circuit exports different power amplification efficiencies during same default power output, and chooses the maximum supply power voltage of power amplification efficiency as described default supply power voltage.
3. electric supply installation as claimed in claim 1 or 2, it is characterized in that, described testing circuit is used for the current output voltage detecting described audio power amplifier circuit in real time, and calculate present output power, described present output power equal current output voltage square divided by the resistance of the load of described audio power amplifier circuit.
4. electric supply installation as claimed in claim 1, it is characterized in that, described power module comprises a DC-DC converter.
5. an audio-frequence player device, is characterized in that, comprises audio power amplifier circuit in claim 1 and as the electric supply installation in claim 1-4 as described in any one.
6. a method of supplying power to for audio power amplifier circuit, is characterized in that, described method of supplying power to utilizes electric supply installation as claimed in claim 1 to realize, and comprises the following steps:
S
1, store at least two group corresponding relations, often organize corresponding relation and comprise the default supply power voltage that one of described audio power amplifier circuit presets power output and the output of described power module respectively, the power amplification efficiency that described default supply power voltage is provided for the described audio power amplifier circuit when exporting described default power output reaches maximum, and described power amplification efficiency equals output power when default power output adopts a supply power voltage to power divided by described power module;
S
2, detect the present output power of described audio power amplifier circuit in real time;
S
3, from S
1in the corresponding relation stored, choose with described present output power closest to and be more than or equal to the default power output of described present output power;
S
4, the current supply power voltage of described power module is adjusted to the default supply power voltage corresponding with the default power output be selected.
7. method of supplying power to as claimed in claim 6, it is characterized in that, described output power equals default power output and adds a loss power, and described loss power is the electric energy loss of the described audio power amplifier circuit when described power module adopts described supply power voltage to power;
Step S
1also comprise before:
S
01, be stored in described power module and adopt different power voltage when powering, described audio power amplifier circuit exports different electric energy losses during same default power output;
S
02, calculate described power module respectively and adopt different power voltage when powering, described audio power amplifier circuit exports different power amplification efficiencies during same default power output, and choose power amplification efficiency maximum time supply power voltage as default supply power voltage.
8. method of supplying power to as claimed in claims 6 or 7, is characterized in that, S
2comprise:
S
21, detect the current output voltage of described audio power amplifier circuit in real time;
S
22, calculate present output power, described present output power equal current output voltage square divided by the resistance of the load of described audio power amplifier circuit.
9. method of supplying power to as claimed in claim 6, it is characterized in that, described power module comprises a DC-DC converter.
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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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 true CN104333331A (en) | 2015-02-04 |
| CN104333331B CN104333331B (en) | 2017-04-19 |
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|---|---|
| CN104333331B (en) | 2017-04-19 |
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