CN103347104B - The mobile device that can externally charge - Google Patents

The mobile device that can externally charge Download PDF

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Publication number
CN103347104B
CN103347104B CN201310231741.6A CN201310231741A CN103347104B CN 103347104 B CN103347104 B CN 103347104B CN 201310231741 A CN201310231741 A CN 201310231741A CN 103347104 B CN103347104 B CN 103347104B
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mobile device
peripheral apparatus
resistance
voltage
baseband chip
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CN201310231741.6A
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CN103347104A (en
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王晓君
张帆
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Weihai Ningxi Software Technology Co ltd
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Huizhou TCL Mobile Communication Co Ltd
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Abstract

The invention discloses a kind of mobile device that can externally charge, this mobile device comprises earphone socket, baseband chip module, power module, detection module and control module, earphone socket comprises microphone end and end-speech, when earphone socket inserts peripheral apparatus, detection module detects the magnitude of voltage of peripheral apparatus and sends to baseband chip module, by magnitude of voltage, baseband chip module judges that whether mobile device carries out audio signal transmission with peripheral apparatus or whether mobile device is that peripheral apparatus charges, control module controls mobile device according to judged result and whether carries out audio signal transmission with peripheral apparatus or whether mobile device is that peripheral apparatus charges.By the way, the present invention can utilize earphone socket simultaneously when the interface of mobile device is occupied be peripheral apparatus charging, effectively improve Consumer's Experience.

Description

The mobile device that can externally charge
Technical field
The present invention relates to mobile communication technology field, particularly relate to a kind of mobile device that can externally charge.
Background technology
Along with the development of science and technology, mobile phone has become indispensable communication tool in people's daily life.Conveniently cellphone subscriber, the peripheral apparatus of mobile phone configuration also gets more and more, such as writing pen or bluetooth earphone etc.But, the peripheral apparatus of many mobile phone configurations can not be powered alone, often need mobile phone by USB (UniversalSerialBUS during use, USB) mouth is that its power supply could normal work, mobile phone can be that peripheral apparatus is powered by USB under normal circumstances, but the USB port of mobile phone is often occupied simultaneously, such as mobile phone transmits from charging or data, this reduces the experience of user.
In sum, be necessary to provide a kind of mobile device that can externally charge to solve the problem.
Summary of the invention
The technical problem that the present invention mainly solves is to provide a kind of mobile device that can externally charge, and can utilize earphone socket simultaneously when the interface of mobile device is occupied and be peripheral apparatus charging, effectively improve Consumer's Experience.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: provide a kind of mobile device that can externally charge, mobile device comprises earphone socket, baseband chip module, power module detection module and control module, earphone socket comprises microphone end and end-speech, control module respectively with power module, baseband chip module is connected with the end-speech of earphone socket, detection module is connected with the microphone end of baseband chip module and earphone socket respectively, when earphone socket inserts peripheral apparatus, detection module detects the magnitude of voltage of peripheral apparatus and sends to baseband chip module, by magnitude of voltage, baseband chip module judges that whether mobile device carries out audio signal transmission with peripheral apparatus or whether mobile device is that peripheral apparatus charges, control module controls mobile device according to judged result and whether carries out audio signal transmission with peripheral apparatus or whether mobile device is that peripheral apparatus charges, detection module comprises the first resistance, second resistance, first electric capacity, second electric capacity and the 3rd electric capacity, one end of first resistance is connected with the constant voltage source of power module, the other end of the first resistance is connected with one end of the second resistance, the other end of the second resistance is connected with the microphone end of baseband chip module and earphone socket, one end of first electric capacity and baseband chip model calling, the other end of the first electric capacity is connected with one end of one end of the second resistance and the 3rd electric capacity, the other end ground connection of the 3rd electric capacity, one end of second electric capacity and baseband chip model calling, the other end of the second electric capacity is connected with the other end of the second resistance, when peripheral apparatus plugged earphone socket, the other end of the second resistance is connected with one end of the 3rd resistance in peripheral apparatus, the other end ground connection of the 3rd resistance, detection module detects the magnitude of voltage of the 3rd resistance and sends to baseband chip module, baseband chip module judges to obtain carrying out audio signal transmission between current mobile device and peripheral apparatus according to magnitude of voltage, or judge that obtaining current mobile device should be peripheral apparatus charging, obtaining judged result in baseband chip module is when carrying out audio signal transmission between current mobile device and peripheral apparatus, control module controls to carry out audio signal transmission between mobile device and peripheral apparatus, baseband chip module obtain judged result be current mobile device should be peripheral apparatus charging time, control module control mobile device be peripheral apparatus charging.
Wherein, baseband chip module includes analog-to-digital conversion port, analog-to-digital conversion port is connected with the other end of the second resistance, baseband chip module is from the magnitude of voltage of the other end of analog-to-digital conversion port processing second resistance, magnitude of voltage be the first voltage or in first voltage range time, judge to carry out audio signal transmission between mobile device and peripheral apparatus, magnitude of voltage be the second voltage or in the second voltage range time, judge mobile device should be peripheral apparatus charging.
Wherein, baseband chip module includes control signal output port further, when judging to carry out audio signal transmission between mobile device and peripheral apparatus, the first control signal controlling to carry out audio signal transmission between mobile device and peripheral apparatus is exported from control signal output port, when judging that mobile device should be peripheral apparatus charging, exporting from control signal output port and controlling the second control signal that mobile device is peripheral apparatus charging.
Wherein, control module includes control end, audio frequency end, power end and output, control end is connected with control signal output port, audio frequency end and baseband chip model calling, power end is connected with power module, output is connected with the end-speech of earphone socket, when control signal output port output first controls signal to control end, control module controls baseband chip module and earphone socket is connected, to control to carry out audio signal transmission between mobile device and peripheral apparatus, when control signal output port output second controls signal to control end, control module controls power module and earphone socket is connected, charge to control mobile device for peripheral apparatus.
Wherein, according to magnitude of voltage, baseband chip module judges whether earphone socket has insertion peripheral apparatus further, wherein, baseband chip module is from the magnitude of voltage of the other end of analog-to-digital conversion port processing second resistance, magnitude of voltage be tertiary voltage or within the scope of tertiary voltage time, judge that earphone socket does not insert peripheral apparatus.
Wherein, the magnitude of voltage that baseband chip module detects is:
V 1 = V DD × R 3 ( R 1 + R 2 + R 3 )
Wherein, V 1be the magnitude of voltage of the 3rd resistance, V dDfor the magnitude of voltage of the constant voltage source of power module, R 3be the resistance value of the 3rd resistance, R 1be the resistance value of the first resistance, R 2it is the resistance value of the second resistance.
Wherein, the resistance value value of the first resistance and the second resistance meets: R 1+ R 2=2200 Ω.
Wherein, when earphone socket inserts peripheral apparatus, the resistance value value of the 3rd resistance of different peripheral apparatus inside is different, and the magnitude of voltage that baseband chip module detects changes according to the resistance change of the 3rd resistance.
The invention has the beneficial effects as follows: the situation being different from prior art, the mobile device that can externally charge of the present invention is by when peripheral apparatus plugged earphone socket, detection module detects the magnitude of voltage of peripheral apparatus and sends to baseband chip module, by magnitude of voltage, baseband chip module judges that whether mobile device carries out audio signal transmission with peripheral apparatus or whether mobile device is that peripheral apparatus charges, control module controls mobile device according to judged result and whether carries out audio signal transmission with peripheral apparatus or whether mobile device is that peripheral apparatus charges, can utilize earphone socket simultaneously when the interface of mobile device is occupied is peripheral apparatus charging, effectively improve Consumer's Experience.
Accompanying drawing explanation
Fig. 1 is the structural representation of mobile device of the present invention by the first embodiment during earphone socket connection peripheral apparatus;
Fig. 2 is the structural representation of mobile device of the present invention by the second embodiment during earphone socket connection peripheral apparatus.
Embodiment
Below in conjunction with drawings and embodiments, the present invention is described in detail.
As shown in Figure 1, Fig. 1 is the structural representation of mobile device of the present invention by the first embodiment during earphone socket connection peripheral apparatus.Mobile device 10 comprises earphone socket 11, detection module 12, baseband chip module 13, control module 14 and power module 15.Wherein, earphone socket 11 comprises microphone end MIC and end-speech IN3.Control module 14 is connected with the end-speech IN3 of power module 14, baseband chip module 13 and earphone socket 11 respectively, and detection module 12 is connected with the microphone end MIC of baseband chip module 13 and earphone socket 11 respectively.When earphone socket 11 inserts peripheral apparatus 16, detection module 12 detects the magnitude of voltage V of peripheral apparatus 16 1and sending to baseband chip module 13, baseband chip module 13 is by magnitude of voltage V 1judge that whether mobile device 10 carries out audio signal transmission with peripheral apparatus 16 or whether mobile device 10 is that peripheral apparatus 16 charges, control module 14 controls mobile device 10 according to judged result and whether carries out audio signal transmission with peripheral apparatus 16 or whether mobile device 10 is that peripheral apparatus 16 charges.
Wherein, when mobile device 10 carries out audio signal transmission with peripheral apparatus 16, peripheral apparatus 16 refers generally to the audio frequency such as earphone or sound equipment and plays or pick up equipment.For pick up equipment for peripheral apparatus 16, now peripheral apparatus 16 by the microphone end MIC input audio signal of earphone socket 11 to mobile device 10; For earphone or stereo set for peripheral apparatus 16, mobile device 10 by the end-speech IN3 output audio signal of earphone socket 11 to peripheral apparatus 16.When mobile device 10 is peripheral apparatus 16 charging, peripheral apparatus 16 refers generally to the electronic equipment configuring rechargeable battery, and now mobile device 10 is that peripheral apparatus 16 charges by the end-speech IN3 of earphone socket 11.Wherein, mobile device 20 can be mobile phone, notebook, panel computer or handheld device etc.
In the present embodiment, mobile device 10 and peripheral apparatus 16 are carried out to the situation of audio signal transmission, preferably peripheral apparatus 16 can by the microphone end MIC input audio signal of earphone socket 11 to mobile device 10, simultaneously mobile device 10 again by the end-speech IN3 output audio signal of earphone socket 11 to peripheral apparatus 16.
As shown in Figure 2, Fig. 2 is the structural representation of mobile device of the present invention by the second embodiment during earphone socket connection peripheral apparatus.Mobile device 20 comprises earphone socket 21, detection module 22, baseband chip module 23, power module 25 and control module 24.Detection module 22 comprises the first resistance R 1, the second resistance R 2, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3.Wherein, earphone socket 21 comprises microphone end MIC and end-speech IN3, and baseband chip module 23 includes analog-to-digital conversion port ADC and control signal output port GPIO, and control module 24 includes control end EN, audio frequency end IN1, power end IN2 and output OUT.
First resistance R 1one end and the constant voltage source V of power module 25 dDconnect, the first resistance R 1the other end and the second resistance R 2one end, the other end of the first electric capacity C1, the 3rd electric capacity C3 one end connect, one end of the first electric capacity C1 connects the other end ground connection of baseband chip module the 23, three electric capacity C3.Second resistance R 2the other end be connected with the microphone end MIC of the other end of the second electric capacity C2, the analog-to-digital conversion port ADC of baseband chip module 23 and earphone socket 21, one end of the second electric capacity C2 is connected with baseband chip module 23.The control end EN of control module 24 is connected with the control signal output port GPIO of baseband chip module 23, and the audio frequency end IN1 of control module 24 is connected with baseband chip module 23, and the power end IN2 of control module 24 is connected with power module 25.The output OUT of control module 24 is connected with the end-speech IN3 of earphone socket 21.
In the present embodiment, electric capacity C1, electric capacity C2 and electric capacity C3 are capacitance, rise every straight function.Wherein, the capacitance of electric capacity C1 and electric capacity C2 is preferably 100uF, and certainly, in other embodiments, the capacitance of electric capacity C1 and electric capacity C2 can also be other values, and concrete needs determines according to side circuit.
Wherein, when peripheral apparatus 26 plugged earphone socket 21, the second resistance R 2the other end and peripheral apparatus 26 in the 3rd resistance R 3one end connect, the 3rd resistance R 3other end ground connection.Detection module 22 detects the 3rd resistance R 3magnitude of voltage V 1and sending to baseband chip module 23, baseband chip module 23 is according to magnitude of voltage V 1judge to obtain between current mobile device 20 and peripheral apparatus 26, carrying out audio signal transmission or judge to obtain current mobile device 20 to should be peripheral apparatus 26 and charge.Obtaining judged result in baseband chip module 23 is when carrying out audio signal transmission between current mobile device 20 and peripheral apparatus 26, and control module 24 controls to carry out audio signal transmission between mobile device 20 and peripheral apparatus 26.Baseband chip module 23 obtain judged result be current mobile device 20 should be peripheral apparatus 26 charge time, control module 24 controls mobile device 20 and charges for peripheral apparatus 26.
In the present embodiment, the magnitude of voltage V that detects of detection module 22 1for: wherein, V 1be the 3rd resistance R 3magnitude of voltage, V dDfor the magnitude of voltage of the constant voltage source of power module 25, R 3be the resistance value of the 3rd resistance, R 1be the resistance value of the first resistance, R 2it is the resistance value of the second resistance.And be the accuracy of detection into a consideration detection module 22, the first resistance R 1with the second resistance R 2resistance value value meet: R 1+ R 2=2200 Ω.Wherein, when earphone socket 21 inserts peripheral apparatus 26, the 3rd resistance R of different peripheral apparatus 26 inside 3resistance value value different, the magnitude of voltage V that detection module 22 detects 1according to the 3rd resistance R 3resistance change and change.
In the present embodiment, when carrying out audio signal transmission between mobile device 20 and peripheral apparatus 26, peripheral apparatus 26 is preferably earphone, and certainly, in other embodiments, peripheral apparatus 26 also can be other peripheral apparatus.
Below the operation principle of the mobile device 20 that can externally charge of the present invention is described.
Please refer to Fig. 2, when peripheral apparatus 26 plugged earphone socket 21, the second resistance R 2the other end and peripheral apparatus 26 in the 3rd resistance R 3one end connect, the 3rd resistance R 3other end ground connection, make constant voltage source V dD, the first resistance R 1, the second resistance R 2with the 3rd resistance R 3form a conducting loop, due to the 3rd resistance R 3other end ground connection, then the 3rd resistance R 3magnitude of voltage V 1also be equivalent to the second resistance R simultaneously 2the magnitude of voltage of the other end, then detection module 22 is by detecting the second resistance R 2the magnitude of voltage of the other end detect the 3rd resistance R 3magnitude of voltage V 1.
When inserting needs at earphone socket 21 and carrying out the peripheral apparatus 26 of audio signal transmission with mobile device 20, baseband chip module 23 gathers the 3rd resistance R from analog-to-digital conversion port ADC 3magnitude of voltage V 1, due to the 3rd resistance R in different peripheral equipment 26 3difference, then the 3rd resistance R 3magnitude of voltage V 1pass through formula: calculate the 3rd resistance R 3magnitude of voltage V 1.At magnitude of voltage V 1be the first voltage or in first voltage range time, baseband chip module 23 exports the first control signal controlling to carry out audio signal transmission between mobile device 20 and peripheral apparatus 26 from control signal output port GPIO, when control signal output port GPIO output first controls signal to control end EN, the audio frequency end IN1 of control module 24 and output OUT connects and connects with earphone socket 21 to control baseband chip module 23, thus controls to carry out audio signal transmission between mobile device 20 and peripheral apparatus 26.
Wherein, when carrying out audio signal transmission between mobile device 20 and peripheral apparatus 26, peripheral apparatus 26 is preferably earphone, user is from the microphone end MIC input audio signal of earphone socket 21, audio signal through the process of the first electric capacity C1 and the second electric capacity C2, then is carried out audio signal through baseband chip module 23 and to be amplified and analog signal converts the process of digital signal to.Wherein, the second electric capacity C2 and the first electric capacity C1 forms pseudo-differential path, effectively can improve the interference of the anti-common-mode noise of path.Constant voltage source V dDfor the amplification of earpiece audio signal provides bias voltage, the first resistance R 1with the second resistance R 2for the amplification of audio signal provides biasing resistor, make amplifying circuit be operated in saturation region, complete its amplification task.Wherein, the 3rd resistance R in earphone 3resistance value be preferably: R 3=1000 Ω.End-speech IN3 and the baseband chip module 23 of earphone socket 21 are connected, baseband chip module 23 receives the audio signal that other equipment sends, and audio signal is carried out digital signal and converted analog signal to and by end-speech IN3 output audio signal by baseband chip module 23.
When needing mobile device 20 to be the peripheral apparatus 26 of its charging in earphone socket 21 insertion, baseband chip module 23 gathers the 3rd resistance R from analog-to-digital conversion port ADC 3magnitude of voltage V 1, due to the 3rd resistance R in different peripheral equipment 26 3difference, then the 3rd resistance R 3magnitude of voltage V 1pass through formula: calculate the 3rd resistance R 3magnitude of voltage V 1.At magnitude of voltage V 1be the second voltage or in the second voltage range time, baseband chip module 23 exports from control signal output port GPIO and controls the second control signal that mobile device 20 is peripheral apparatus 26 charging, when control signal output port GPIO output second controls signal to control end EN, the power end IN2 of control module 24 and output OUT connects and connects with earphone socket 21 to control power module 25, thus control mobile device 20 charges for peripheral apparatus 26.
Wherein, power module 25 is preferably the battery of mobile device 20 inside, and certainly, in other embodiments, power module 25 also can be the power supply circuits module of mobile device 20 inside, and concrete needs determines according to actual design.When needing mobile device 20 to be the peripheral apparatus 26 of its charging in earphone socket 21 insertion, peripheral apparatus 26 can be bluetooth earphone, writing pen or other peripheral apparatus needing mobile device 20 to charge for it.
Further, when inserting peripheral apparatus 26 at earphone socket 21, baseband chip module 23 gathers the 3rd resistance R from analog-to-digital conversion port ADC 3magnitude of voltage V 1, due to the 3rd resistance R in different peripheral equipment 26 3difference, then the 3rd resistance R 3magnitude of voltage V 1pass through formula: calculate the 3rd resistance R 3magnitude of voltage V 1.At magnitude of voltage V 1for tertiary voltage or within the scope of tertiary voltage time, baseband chip module 23 judges that earphone socket 21 does not insert peripheral apparatus 26 or peripheral apparatus 26 is connected instability with the signal of earphone socket 21, then need to reinsert peripheral apparatus 26.
In the present embodiment, the first voltage or first voltage range, the second voltage or the second voltage range and tertiary voltage or tertiary voltage scope are the value that user sets, and concrete needs sets according to actual conditions.
In sum, the mobile device that can externally charge of the present invention is by when peripheral apparatus plugged earphone socket, detection module detects the magnitude of voltage of peripheral apparatus and sends to baseband chip module, by magnitude of voltage, baseband chip module judges that whether mobile device carries out audio signal transmission with peripheral apparatus or whether mobile device is that peripheral apparatus charges, control module controls mobile device according to judged result and whether carries out audio signal transmission with peripheral apparatus or whether mobile device is that peripheral apparatus charges, can utilize earphone socket simultaneously when the interface of mobile device is occupied is peripheral apparatus charging, effectively improve Consumer's Experience.
The foregoing is only embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; 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. the mobile device that can externally charge, it is characterized in that, described mobile device comprises earphone socket, baseband chip module, power module, detection module and control module, described earphone socket comprises microphone end and end-speech, described control module respectively with described power module, described baseband chip module is connected with the end-speech of described earphone socket, described detection module is connected with the microphone end of described baseband chip module and described earphone socket respectively, when described earphone socket inserts peripheral apparatus, described detection module detects the magnitude of voltage of described peripheral apparatus and sends to described baseband chip module, by described magnitude of voltage, described baseband chip module judges that whether described mobile device carries out audio signal transmission with described peripheral apparatus or whether described mobile device is that described peripheral apparatus charges, described control module controls described mobile device according to judged result and whether carries out audio signal transmission with described peripheral apparatus or whether described mobile device is that described peripheral apparatus charges,
Described detection module comprises the first resistance, second resistance, first electric capacity, second electric capacity and the 3rd electric capacity, one end of described first resistance is connected with the constant voltage source of described power module, the other end of described first resistance is connected with one end of described second resistance, the other end of described second resistance is connected with the microphone end of described baseband chip module and described earphone socket, one end of described first electric capacity and described baseband chip model calling, the other end of described first electric capacity is connected with one end of one end of described second resistance and described 3rd electric capacity, the other end ground connection of described 3rd electric capacity, one end of described second electric capacity and described baseband chip model calling, the other end of described second electric capacity is connected with the other end of described second resistance,
When peripheral apparatus inserts described earphone socket, the other end of described second resistance is connected with one end of the 3rd resistance in described peripheral apparatus, the other end ground connection of described 3rd resistance, described detection module detects the magnitude of voltage of described 3rd resistance and sends to described baseband chip module, described baseband chip module judges to obtain carrying out audio signal transmission between current described mobile device and described peripheral apparatus according to described magnitude of voltage, or judge that obtaining current described mobile device should be the charging of described peripheral apparatus, obtaining judged result in described baseband chip module is when carrying out audio signal transmission between current described mobile device and described peripheral apparatus, described control module controls to carry out audio signal transmission between described mobile device and described peripheral apparatus, described baseband chip module obtain described judged result be current described mobile device should be described peripheral apparatus charging time, described control module control described mobile device be described peripheral apparatus charging.
2. mobile device according to claim 1, it is characterized in that, described baseband chip module includes analog-to-digital conversion port, described analog-to-digital conversion port is connected with the other end of described second resistance, described baseband chip module is from the magnitude of voltage of the other end of the second resistance described in described analog-to-digital conversion port processing, described magnitude of voltage be the first voltage or in first voltage range time, judge to carry out audio signal transmission between described mobile device and described peripheral apparatus, described magnitude of voltage be the second voltage or in the second voltage range time, judge that described mobile device should be the charging of described peripheral apparatus.
3. mobile device according to claim 2, it is characterized in that, described baseband chip module includes control signal output port further, when judging to carry out audio signal transmission between described mobile device and described peripheral apparatus, the first control signal controlling to carry out audio signal transmission between described mobile device and described peripheral apparatus is exported from described control signal output port, when judging that described mobile device should be the charging of described peripheral apparatus, export from described control signal output port and control the second control signal that described mobile device is the charging of described peripheral apparatus.
4. mobile device according to claim 3, it is characterized in that, described control module includes control end, audio frequency end, power end and output, described control end is connected with described control signal output port, described audio frequency end and described baseband chip model calling, described power end is connected with described power module, described output is connected with the end-speech of described earphone socket, when described control signal output port output described first controls signal to described control end, described control module controls described baseband chip module and described earphone socket is connected, to control to carry out audio signal transmission between described mobile device and described peripheral apparatus, when described control signal output port output described second controls signal to described control end, described control module controls described power module and described earphone socket is connected, with control described mobile device be described peripheral apparatus charging.
5. mobile device according to claim 2, it is characterized in that, according to described magnitude of voltage, described baseband chip module judges whether described earphone socket has further and inserts described peripheral apparatus, wherein, described baseband chip module is from the magnitude of voltage of the other end of the second resistance described in described analog-to-digital conversion port processing, described magnitude of voltage be tertiary voltage or within the scope of tertiary voltage time, judge that described earphone socket does not insert described peripheral apparatus.
6. mobile device according to claim 1, is characterized in that, the magnitude of voltage that described baseband chip module detects is:
V 1 = V DD × R 3 ( R 1 + R 2 + R 3 )
Wherein, V 1for the magnitude of voltage of described 3rd resistance, V dDfor the magnitude of voltage of the constant voltage source of described power module, R 3for the resistance value of described 3rd resistance, R 1for the resistance value of described first resistance, R 2for the resistance value of described second resistance.
7. mobile device according to claim 6, is characterized in that, the resistance value value of described first resistance and described second resistance meets: R 1+ R 2=2200 Ω.
8. mobile device according to claim 7, it is characterized in that, when described earphone socket inserts described peripheral apparatus, the resistance value value of described 3rd resistance of different described peripheral apparatus inside is different, and the magnitude of voltage that described baseband chip module detects changes according to the resistance change of described 3rd resistance.
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US9736567B2 (en) * 2014-09-29 2017-08-15 Qualcomm Incorporated Electronics interface for device headset jack
CN106816773B (en) * 2015-12-02 2020-06-12 北京奇虎科技有限公司 Control method and device of power socket
CN111130222B (en) * 2018-10-30 2022-04-01 北京小米移动软件有限公司 Wireless charging power supply circuit and method and electronic equipment

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