CN103581802A - Earphone power self-adaption circuit and mobile terminal - Google Patents
Earphone power self-adaption circuit and mobile terminal Download PDFInfo
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- CN103581802A CN103581802A CN201310573799.9A CN201310573799A CN103581802A CN 103581802 A CN103581802 A CN 103581802A CN 201310573799 A CN201310573799 A CN 201310573799A CN 103581802 A CN103581802 A CN 103581802A
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- baseband processing
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Abstract
The invention discloses an earphone power self-adaption circuit and a mobile terminal. The mobile terminal comprises the earphone power self-adaption circuit. The earphone power self-adaption circuit comprises a voltage-stabilized source, a constant value resistor and a baseband processing chip. The voltage-stabilized source is connected with one end of the constant value resistor, and the other end of the constant value resistor is connected with the sound track output end of the baseband processing chip. The analog-digital conversion end of the baseband processing chip is connected with the common end of the constant value resistor and the sound track output end of the baseband processing chip, and collects division voltage formed by first voltage between the constant value resistor and an earphone load, then the baseband processing chip can calculate loads of an earphone, the maximum output voltage of the sound track output end of the baseband processing chip can be set according to the loads of the earphone, then output power of the sound track output end of the baseband processing chip is made to be smaller than the allowed maximum output power, and when the mobile terminal uses any earphone, the optimal working state of the earphone can be guaranteed.
Description
Technical field
The present invention relates to Mobile terminal accessory field, particularly relate to a kind of earphone power adaptive method and mobile terminal.
Background technology
The use that is accompanied by mobile terminal is universal, and the accessory facility supporting with it also becomes an indispensable part in people's life, such as earphone.Although earphone species is very various in the market, but which kind of mobile terminal no matter, its earphone output is all to design for a kind of impedance, and based on this impedance, design rated power and the maximum power that specific voltage range meets earphone normal operation, as shown in Figure 1, in use, mobile terminal and earphone are all one to one.
But when inserting the earphone of mobile terminal and the impedance of its setting when inconsistent, the earphone impedance of setting such as mobile terminal is 32 ohm, rated power is 10mW, maximum power is 50mW, the rated voltage amplitude requiring while working is ± 0.8V, maximum voltage amplitude is ± 1.79V, when inserting the impedance of the earphone of mobile terminal, it is 16 ohm, when rated power is 10mW, mobile terminal or according to set ± the rated voltage output of 0.8V, the actual power of earphone work is 20mW so, now, earphone will continue super rated power work, this is healthy by grievous injury earphone itself and user's.
Summary of the invention
The technical problem that the present invention mainly solves is to provide a kind of earphone power adaptive circuit and mobile terminal, can automatically identify the impedance of insertion earphone wherein, and automatic power adjustment output, reach while allowing mobile terminal use any earphone, can guarantee the optimum Working of earphone.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of earphone power adaptive circuit is provided, it is characterized in that, comprise stabilized voltage power supply, fixed value resistance and baseband processing chip, described stabilized voltage power supply connects one end of described fixed value resistance, the other end of described fixed value resistance connects the sound channel output of described baseband processing chip, and the analog-to-digital conversion end of described baseband processing chip connects the common port of the sound channel output of described fixed value resistance and described baseband processing chip
Described stabilized voltage power supply is for exporting the first voltage at test phase;
The analog-to-digital conversion end of described baseband processing chip is used at test phase collecting test voltage, wherein, after described test voltage is earphone access, the branch pressure voltage that described the first voltage forms between described fixed value resistance and earphone load;
Described baseband processing chip is for calculating the load of described earphone according to described test voltage, and the maximum output voltage of the sound channel output of described baseband processing chip is set according to the load of described earphone, thereby make the power output of the sound channel output of described baseband processing chip be less than the maximum power that allows output.
Wherein, described the first voltage is 2.8V, and described fixed value resistance is 510 ohm.
Wherein, described peak power output is 500mW.
Wherein, described baseband processing chip for according to described test voltage, calculate described earphone load according to for formula V
x=V
dD* R
x/ (R+R
x), wherein, Vx is the described test voltage that described ADC collects, V
dDfor described the first voltage, R is described fixed value resistance, the load that Rx is described earphone.
For solving the problems of the technologies described above, another technical solution used in the present invention is: a kind of mobile terminal is provided, it is characterized in that, comprising: earphone power adaptive circuit;
Described earphone power adaptive circuit comprises source of stable pressure, fixed value resistance and baseband processing chip, described stabilized voltage power supply connects one end of described fixed value resistance, the other end of described fixed value resistance connects the sound channel output of described baseband processing chip, the analog-to-digital conversion end of described baseband processing chip connects the common port of the sound channel output of described fixed value resistance and described baseband processing chip
Described stabilized voltage power supply is for exporting the first voltage at test phase;
The analog-to-digital conversion end of described baseband processing chip is used at test phase collecting test voltage, wherein, after described test voltage is earphone access, the branch pressure voltage that described the first voltage forms between described fixed value resistance and earphone load;
Described baseband processing chip is for calculating the load of described earphone according to described test voltage, and the maximum output voltage of the sound channel output of described baseband processing chip is set according to the load of described earphone, thereby make the power output of the sound channel output of described baseband processing chip be less than the maximum power that allows output.
Wherein, described the first voltage is 2.8V, and described fixed value resistance is 510 ohm.
Wherein, described peak power output is 500mW.
Wherein, described baseband processing chip for according to described test voltage, calculate described earphone load according to for formula V
x=V
dD* R
x/ (R+R
x), wherein, Vx is the described test voltage that described ADC collects, V
dDfor described the first voltage, R is described fixed value resistance, the load that Rx is described earphone.
The invention has the beneficial effects as follows: the situation that is different from prior art, the present invention connects a stabilized voltage power supply and fixed value resistance by the sound channel output at baseband processing chip, voltage of voltage regulation is exported the first voltage, the analog-to-digital conversion end of baseband processing chip gathers the branch pressure voltage that the first voltage forms between fixed value resistance and earphone load, and then baseband processing chip calculates the load of earphone, and the maximum output voltage of the sound channel output of baseband processing chip is set according to the load of earphone, thereby the power output that makes the sound channel output of baseband processing chip is less than the maximum power that allows output.Utilize the present invention can realize the impedance that mobile terminal can be identified insertion earphone wherein automatically, and automatic power adjustment output, while making mobile terminal use any earphone, can guarantee the optimum Working of earphone.
Accompanying drawing explanation
Fig. 1 is the circuit diagram that earphone of the prior art inserts mobile terminal;
Fig. 2 is the circuit diagram of earphone power adaptive circuit of the present invention one execution mode;
The circuit diagram of earphone power adaptive circuit one execution mode when Fig. 3 is earphone insertion of the present invention.
Embodiment
Consult Fig. 2, Fig. 2 is the circuit diagram of earphone power adaptive circuit of the present invention one execution mode, earphone power adaptive circuit in present embodiment comprises: stabilized voltage power supply (VDD), fixed value resistance (R) and baseband processing chip IC, stabilized voltage power supply (VDD) connects one end of fixed value resistance (R), the other end of fixed value resistance (R) connects the sound channel output of described baseband processing chip IC, wherein, sound channel output comprises L channel output L and R channel output R, the analog-to-digital conversion end ADC of baseband processing chip IC connects the common port of the sound channel output of fixed value resistance (R) and described baseband processing chip IC.
Stabilized voltage power supply (VDD) is provided by baseband processing chip IC, for export the first voltage at test phase, as shown in the table:
| ? | 8 Europe | 16 Europe | 32 Europe | 64 Europe |
| Voltage (V) | ±0.9 | ±1.26 | ±1.79 | ±2.53 |
| Power (W) | 0.05 | 0.05 | 0.05 | 0.05 |
Corresponding voltage and the power of earphone impedance is in the market generally above 4 kinds, corresponding peak power output is all 0.5W, corresponding maximum output voltage is 2.53V, so stabilized voltage power supply (VDD) need to be greater than 2.53V at the first voltage of test phase output, but in order to guarantee to reduce the impact on earphone normal operation after test phase completes, the first voltage can not be excessive, preferred, the present invention adopts 2.8V, and the fixed value resistance corresponding with 2.8V is 510 ohm.Optionally, when selecting other models IC chip, the first voltage can also be other numerical value, as 2.7V or 2.9V, it is pointed out that when changing the first voltage, needs the corresponding resistance value of the fixed value resistance of series connection with it of revising.
The analog-to-digital conversion end ADC of baseband processing chip is used at test phase collecting test voltage, wherein, after described test voltage is earphone access, the branch pressure voltage that the first voltage forms between fixed value resistance (R) and earphone load, according to this test voltage, baseband processing chip IC calculates the voltage at resistance (R) two ends, i.e. V
r=V
dD-Vx, wherein, V
rfor the voltage at fixed value resistance two ends, V
dDfor the first voltage that steady point source VDD provides, Vx is that analog-to-digital conversion end ADC is at test phase collecting test voltage.
Baseband processing chip IC is for calculating the load of described earphone according to test voltage, and the maximum output voltage of the sound channel output of baseband processing chip is set according to the load of earphone, thereby make the power output of the sound channel output of baseband processing chip be less than the maximum power that allows output.
Wherein, baseband processing chip for according to described test voltage, calculate described earphone load according to for formula V
x=V
dD* R
x/ (R+R
x), i.e. R
x=V
x* R/ (V
dD-V
x) wherein, Vx is the described test voltage that described ADC collects, V
dDfor described the first voltage, R is described fixed value resistance, the load that Rx is described earphone.
When baseband processing chip IC calculates the voltage V at fixed value resistance (R) two ends
rafter, can calculate the size of current I in circuit, I=V
r/ R, i.e. I=(V
dD-Vx)/R, wherein, V
rfor the voltage at fixed value resistance two ends, V
ddfor the first voltage that steady point source VDD provides, Vx be analog-to-digital conversion end ADC at test phase collecting test voltage, R is resistance value 510 Europe of fixed value resistance (R).
Baseband processing chip IC calculates after the electric current of load that electric current I in circuit namely flows into earphone, calculates the load R of earphone
x, R
x=Vx/I, i.e. R
x=Vx*R/ (V
dD-Vx).
Calculate the load R of earphone
xafter, needed maximum output voltage in the time of can further earphone normal operation being set according to the load of earphone, be the maximum output voltage of the sound channel output of baseband processing chip IC, thereby make the power output of the sound channel output of described baseband processing chip be less than the maximum power 500mW that allows output.
Particularly, as shown in Figure 3, the circuit diagram of earphone power adaptive circuit one execution mode when Fig. 3 is earphone insertion of the present invention.When having earphone to insert mobile terminal, the load that baseband processing chip IC is earphone provides the first voltage of 2.8V, the analog-to-digital conversion end ADC collecting test voltage of baseband processing chip now, wherein, after described test voltage is earphone access, the branch pressure voltage that described the first voltage forms between described fixed value resistance and earphone load, after analog-to-digital conversion end ADC collecting test voltage, baseband processing chip IC can calculate the resistance at fixed value resistance R two ends, and then calculate the current signal in circuit, obtain further the load of earphone, and the maximum output voltage of the sound channel output of described baseband processing chip is set according to the load of described earphone, thereby the power output that makes the sound channel output of described baseband processing chip is less than the maximum power that allows output.
Be different from prior art, the present invention connects a stabilized voltage power supply and fixed value resistance by the sound channel output at baseband processing chip, voltage of voltage regulation is exported the first voltage, the analog-to-digital conversion end of baseband processing chip gathers the branch pressure voltage that the first voltage forms between fixed value resistance and earphone load, and then baseband processing chip calculates the load of earphone, and the maximum output voltage of the sound channel output of baseband processing chip is set according to the load of earphone, thereby make the power output of the sound channel output of baseband processing chip be less than the maximum power that allows output.Utilize the present invention can realize the impedance that mobile terminal can be identified insertion earphone wherein automatically, and automatic power adjustment output, while making mobile terminal use any earphone, can guarantee the optimum Working of earphone.
The present invention also provides a kind of mobile terminal, and wherein, described mobile terminal comprises earphone power adaptive circuit, and physical circuit figure and the course of work as mentioned above, repeat no more herein.
The foregoing is only embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (8)
1. an earphone power adaptive circuit, it is characterized in that, comprise stabilized voltage power supply, fixed value resistance and baseband processing chip, described stabilized voltage power supply connects one end of described fixed value resistance, the other end of described fixed value resistance connects the sound channel output of described baseband processing chip, the analog-to-digital conversion end of described baseband processing chip connects the common port of the sound channel output of described fixed value resistance and described baseband processing chip
Described stabilized voltage power supply is for exporting the first voltage at test phase;
The analog-to-digital conversion end of described baseband processing chip is used at test phase collecting test voltage, wherein, after described test voltage is earphone access, the branch pressure voltage that described the first voltage forms between described fixed value resistance and earphone load;
Described baseband processing chip is for calculating the load of described earphone according to described test voltage, and the maximum output voltage of the sound channel output of described baseband processing chip is set according to the load of described earphone, thereby make the power output of the sound channel output of described baseband processing chip be less than the maximum power that allows output.
2. circuit according to claim 1, is characterized in that, described the first voltage is 2.8V, and described fixed value resistance is 510 ohm.
3. circuit according to claim 1, is characterized in that, described peak power output is 500mW.
4. circuit according to claim 1, is characterized in that, described baseband processing chip for according to described test voltage, calculate described earphone load according to for formula V
x=V
dD* R
x/ (R+R
x), wherein, Vx is the described test voltage that described ADC collects, V
dDfor described the first voltage, R is described fixed value resistance, the load that Rx is described earphone.
5. a mobile terminal, is characterized in that, comprising: earphone power adaptive circuit;
Described earphone power adaptive circuit comprises stabilized voltage power supply, fixed value resistance and baseband processing chip, described stabilized voltage power supply connects one end of described fixed value resistance, the other end of described fixed value resistance connects the sound channel output of described baseband processing chip, the analog-to-digital conversion end of described baseband processing chip connects the common port of the sound channel output of described fixed value resistance and described baseband processing chip
Described stabilized voltage power supply is for exporting the first voltage at test phase;
The analog-to-digital conversion end of described baseband processing chip is used at test phase collecting test voltage, wherein, after described test voltage is earphone access, the branch pressure voltage that described the first voltage forms between described fixed value resistance and earphone load;
Described baseband processing chip is for calculating the load of described earphone according to described test voltage, and the maximum output voltage of the sound channel output of described baseband processing chip is set according to the load of described earphone, thereby make the power output of the sound channel output of described baseband processing chip be less than the maximum power that allows output.
6. mobile terminal according to claim 5, is characterized in that, described the first voltage is 2.8V, and described fixed value resistance is 510 ohm.
7. mobile terminal according to claim 5, is characterized in that, described peak power output is 500mW.
8. mobile terminal according to claim 5, is characterized in that, it is characterized in that, described baseband processing chip for according to described test voltage, calculate described earphone load according to for formula V
x=V
dD* R
x/ (R+R
x), wherein, Vx is the described test voltage that described ADC collects, V
dDfor described the first voltage, R is described fixed value resistance, the load that Rx is described earphone.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310573799.9A CN103581802A (en) | 2013-11-15 | 2013-11-15 | Earphone power self-adaption circuit and mobile terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310573799.9A CN103581802A (en) | 2013-11-15 | 2013-11-15 | Earphone power self-adaption circuit and mobile terminal |
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| CN103581802A true CN103581802A (en) | 2014-02-12 |
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| CN201310573799.9A Pending CN103581802A (en) | 2013-11-15 | 2013-11-15 | Earphone power self-adaption circuit and mobile terminal |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105700613A (en) * | 2016-02-14 | 2016-06-22 | 惠州Tcl移动通信有限公司 | Output power adjusting device and method of mobile terminal |
| CN105979465A (en) * | 2016-06-29 | 2016-09-28 | 北京小米移动软件有限公司 | Method and device for determining maximum output power value of earphone equipment |
| CN106899908A (en) * | 2017-02-27 | 2017-06-27 | 努比亚技术有限公司 | Earphone, apparatus for processing audio, method and system |
| CN107370860A (en) * | 2017-07-21 | 2017-11-21 | 上海创功通讯技术有限公司 | Mobile terminal and its headset detection system and method |
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| CN1960175A (en) * | 2005-11-03 | 2007-05-09 | 三星电子株式会社 | Method and apparatus to control output power of a power amplifier and audio player having the same |
| CN101179871A (en) * | 2006-11-10 | 2008-05-14 | 鸿富锦精密工业（深圳）有限公司 | Earphone and audio play device |
| US7450726B2 (en) * | 2004-03-11 | 2008-11-11 | Texas Instruments Incorporated | Headset detector in a device generating audio signals |
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2013
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7450726B2 (en) * | 2004-03-11 | 2008-11-11 | Texas Instruments Incorporated | Headset detector in a device generating audio signals |
| CN1960175A (en) * | 2005-11-03 | 2007-05-09 | 三星电子株式会社 | Method and apparatus to control output power of a power amplifier and audio player having the same |
| CN101179871A (en) * | 2006-11-10 | 2008-05-14 | 鸿富锦精密工业（深圳）有限公司 | Earphone and audio play device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105700613A (en) * | 2016-02-14 | 2016-06-22 | 惠州Tcl移动通信有限公司 | Output power adjusting device and method of mobile terminal |
| CN105979465A (en) * | 2016-06-29 | 2016-09-28 | 北京小米移动软件有限公司 | Method and device for determining maximum output power value of earphone equipment |
| CN106899908A (en) * | 2017-02-27 | 2017-06-27 | 努比亚技术有限公司 | Earphone, apparatus for processing audio, method and system |
| CN106899908B (en) * | 2017-02-27 | 2019-06-25 | 努比亚技术有限公司 | Apparatus for processing audio, method and system |
| CN107370860A (en) * | 2017-07-21 | 2017-11-21 | 上海创功通讯技术有限公司 | Mobile terminal and its headset detection system and method |
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Application publication date: 20140212 |