CN206323526U - Earphone interface circuit and terminal device - Google Patents
Earphone interface circuit and terminal device Download PDFInfo
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- CN206323526U CN206323526U CN201621334653.4U CN201621334653U CN206323526U CN 206323526 U CN206323526 U CN 206323526U CN 201621334653 U CN201621334653 U CN 201621334653U CN 206323526 U CN206323526 U CN 206323526U
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Abstract
The application proposes a kind of earphone interface circuit and terminal device, wherein, earphone interface circuit, including：Earphone audio amplifier and switch module；Wherein, one end of switch module is connected with the earphone audio amplifier, and the other end of switch module is connected with earphone socket；When voltage in the earphone socket is less than or equal to preset value, the switch module is in the conduction state, and when the voltage in the earphone socket is higher than preset value, the switch module is off.Thus, the surge voltage that effectively prevent external equipment generation damages earphone audio amplifier, improves the safety and reliability of earphone audio amplifier, improves Consumer's Experience.
Description
Technical field
The application is related to electronic technology field, more particularly to a kind of earphone interface circuit and terminal device.
Background technology
Generally, earphone interface is both provided with terminal device, for by peripheral earphone line or other data wires, by eventually
Sound signal in end equipment plays to user by earphone or external speaker.
At present, the main form as shown in Figure 1 of path that terminal device plays sound signal using earphone interface：Audio frequency is believed
Number earphone audio amplifier is first passed around, then by being exported after filter circuit to earphone socket, and then be input to again and earphone
In the head circuit or audio amplifier circuit of socket connection.
But find in actual use, when terminal device is connected to active audio amplifier by connecting line, due to active sound
The power amplifier of case is easy to produce high voltage surge in the course of the work, if the analog audio input that high voltage pours in power amplifier connects
Mouthful, the earphone audio amplifier that surge voltage is input to terminal device by earphone socket is now just had, so as to cause earphone
The damage of audio amplifier.
The content of the invention
The application is intended at least solve one of technical problem in correlation technique to a certain extent.
Therefore, first purpose of the application is to propose a kind of earphone interface circuit, it is therefore prevented that what external equipment was produced
Surge voltage damages earphone audio amplifier, improves the safety and reliability of earphone audio amplifier, improves user's body
Test.
Second purpose of the application is to propose a kind of terminal device.
For up to above-mentioned purpose, the application first aspect embodiment proposes a kind of earphone interface circuit, including：Earphone audio frequency
Amplifier and switch module；
Wherein, one end of the switch module is connected with the earphone audio amplifier, the other end of the switch module
It is connected with earphone socket；
When voltage in the earphone socket is less than or equal to preset value, the switch module is in the conduction state,
When voltage in the earphone socket is higher than preset value, the switch module is off.
In a kind of possible way of realization of the present embodiment, the earphone audio amplifier includes：L channel passage and the right side
Sound channel passage；
The switch module include respectively with the channel attached first switch of the L channel and with the R channel passage
The second switch of connection.
In the alternatively possible way of realization of the present embodiment, the switch module is N-type MOS field
Effect pipe；
The drain electrode of the N-type metal oxide semiconductor field effect tube is connected with the earphone socket, the N-type metal oxygen
The source electrode of compound semiconductor field is connected with the earphone audio amplifier；
The grid of the N-type metal oxide semiconductor field effect tube is connected with power supply, the magnitude of voltage of the power supply output
It is threshold voltage less than the preset value and the N-type metal oxide semiconductor field effect tube and.
In the alternatively possible way of realization of the present embodiment, the switch module is NPN triode；
The colelctor electrode of the NPN triode is connected with the earphone socket, the emitter stage of the NPN triode and the ear
Machine audio amplifier is connected；
The base stage of the NPN triode is connected with power supply, and the magnitude of voltage of the power supply output is less than or equal to described preset
Value and the NPN triode cut-in voltage and.
In the alternatively possible way of realization of the present embodiment, also include：It is serially connected in the switch module and the power supply
Between first resistor.
In the present embodiment in another possible way of realization, also include：It is connected to one end and ground of the first resistor
Between the first electric capacity and voltage-regulator diode.
In the present embodiment in another possible way of realization, also include：It is connected on the switch module and the earphone
Second resistance between audio amplifier.
In the present embodiment in another possible way of realization, also include：One end and the switch module and the earphone
Socket is connected, the transient diode that the other end is connected to ground.
In the present embodiment in another possible way of realization, also include：It is serially connected in the switch module and the earphone
Inductive component between socket；
It is serially connected in the capacitance component between one end of the Inductive component and the ground.
The earphone interface circuit that the embodiment of the present application is provided, by being accessed between earphone audio amplifier and earphone socket
Switch module, when the voltage at earphone socket is less than or equal to preset value, switch module is in the conduction state, in the earphone
When voltage in socket is higher than preset value, switch module is off, so as to effectively prevent the wave of external equipment generation
Gush voltage and damage earphone audio amplifier, improve the safety and reliability of earphone audio amplifier, improve Consumer's Experience.
For up to above-mentioned purpose, the application second aspect embodiment proposes a kind of terminal device, including：Housing, processor,
Memory, circuit board and power circuit, wherein, the circuit board is placed in the interior volume that the housing is surrounded, and the electricity
It is provided with the plate of road such as above-mentioned earphone interface circuit, the processor and the memory are arranged on the circuit board；It is described
Power circuit, for being powered for each circuit or device of the terminal device；The memory is used to store executable program
Code；The processor is run and the executable program by reading the executable program code stored in the memory
The corresponding program of code.
The terminal device of the embodiment of the present application, by accessing switches set between earphone audio amplifier and earphone socket
Part, when the voltage at earphone socket is less than or equal to preset value, switch module is in the conduction state, in the earphone socket
Voltage be higher than preset value when, switch module is off, thus effectively prevent external equipment generation surge voltage
Earphone audio amplifier is damaged, reliability of the safety and reliability there is provided terminal device of earphone audio amplifier is improved
Property, improve Consumer's Experience.
Brief description of the drawings
Of the invention above-mentioned and/or additional aspect and advantage will become from the following description of the accompanying drawings of embodiments
Substantially and be readily appreciated that, wherein：
Fig. 1 is the path schematic diagram that terminal device plays sound signal by earphone interface in the prior art；
Fig. 2 is the structural representation of the earphone interface circuit of the application one embodiment；
Fig. 3 is the structural representation of earphone interface circuit when switch module is N-type MOSFET；
Fig. 4 is the structural representation of earphone interface circuit when switch module is NPN type triode；
Fig. 5 is the complete structure schematic diagram of earphone interface circuit when switch module is N-type MOSFET；
The structural representation for the terminal device that Fig. 6 provides for the embodiment of the present application.
Description of reference numerals
Earphone audio amplifier -1；Earphone socket -2；Switch module -3；
First switch -34；Second switch -35； MOSFET-31；
Power supply -4；Diode -32；Triode -33；
First resistor -5；First electric capacity -6；Voltage-regulator diode -7；
Second resistance -8；Transient diode -9；Inductive component -10；
Capacitance component -11；First switch -34；MOSFET pipes -31a；
MOSFET pipes -31b；Second resistance -81；Second resistance -81；
Housing -61；Processor -62；Memory -63；
Circuit board -64；Power circuit -65；Earphone interface circuit -641.
Embodiment
Embodiments herein is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the application, and it is not intended that limitation to the application.
Below with reference to the accompanying drawings the earphone interface circuit and terminal device of the embodiment of the present application described.
Fig. 2 is the structural representation of the earphone interface circuit of the application one embodiment.
As shown in Fig. 2 the earphone interface circuit includes：
Earphone audio amplifier 1 and switch module 3；
Wherein, one end of the switch module 3 is connected with the earphone audio amplifier 1, the switch module 3 it is another
End is connected with earphone socket 2；
When voltage in the earphone socket 2 is less than or equal to preset value, the switch module 3 is in the conduction state,
When voltage in the earphone socket 2 is higher than preset value, the switch module 3 is off.
Specifically, in the embodiment of the present application, by between earphone audio amplifier 1 and earphone socket 2, concatenating switches set
Part 3, to protect earphone audio amplifier 1 not damaged by extraneous surge voltage.
Wherein, preset value refers to the maximum voltage value that earphone audio amplifier 1 can be born, when earphone audio amplifier 1 is dashed forward
It when so adding the voltage more than preset value, will damage earphone audio amplifier 1, or reduce the reliability of its work and make
Use the life-span.
When the surge voltage that the active audio amplifier being connected with earphone socket 2 does not produce no surge voltage or generation is less than ear
During the safe voltage of machine audio amplifier 1, the normally of switch module 3, sound signal is through earphone audio amplifier 1, switches set
Part 3 and earphone socket 2 are exported and played out to active audio amplifier；The surge electricity produced when the active audio amplifier being connected with earphone socket 2
When pressure is higher than the safe voltage of earphone audio amplifier 1, switch module 3 disconnects, so as to effectively protect earphone audio amplifier 1
Safety and reliability.
, can be by controlling circuit come the on or off of controlling switch component, such as by earphone when implementing
Voltage sensor or other devices are set to monitor the magnitude of voltage at earphone socket 2, when monitoring earphone socket 2 at socket 2
In magnitude of voltage be less than or equal to preset value when, you can controlling switch component 3 is closed, and sound signal is passed through the He of switch module 3
Earphone socket 2 is exported plays out processing to external speaker；When monitoring that the magnitude of voltage in earphone socket 2 is more than preset value,
I.e. controllable switch component 3 disconnects, so that the surge voltage for avoiding external speaker generation is instead filled to earphone audio amplifier 1
In.
Or, the switch module 3 of particular job parameter and type according to the working characteristics of circuit, can also be chosen, with reality
Operation is opened or turned off to existing switch module 3 automatically with the voltage in two grades of sockets 2.
For example, if switch module 3 is the (Metal-Oxide- of N-type metal oxide semiconductor field effect tube 31
Semiconductor Field-Effect Transistor, abbreviation MOSFET), then switch module 3 and earphone audio-frequency amplification
The annexation of device 1 and earphone socket 2 is as shown in figure 3, the earphone interface circuit that Fig. 3 is switch module when being N-type MOSFET31
Structural representation.
As shown in figure 3, N-type MOSFET31 drain D is connected with the earphone socket 2, the source electrode of the N-type MOSFET31
S is connected with the earphone audio amplifier 1；
The grid G of the N-type MOSFET31 is connected with power supply 4, and the magnitude of voltage VCC that the power supply 4 is exported is less than described pre-
If value and the N-type MOSEFT31 threshold voltage and.
Generally, the magnitude of voltage that earphone audio amplifier 1 is exported is less than or equal to its voltage value, and its wave that can bear
Magnitude of voltage is gushed more than under its voltage value, i.e. normal operating conditions, and the voltage that earphone audio amplifier 1 is exported can less than it
The surge voltage value born.And N-type MOSFET31 turn-on conditions are the voltage difference V for loading grid and source electrodeGSMore than its thresholding electricity
Press Vgs(th)。
Specifically, when circuit form connection as shown in Figure 3, under normal operating conditions, N-type MOSFET31 source electrode electricity
It is the voltage that earphone audio amplifier 1 is exported to press Vs, now, and the output voltage VCC of power supply 4 is exported with earphone audio amplifier 1
Voltage VSDifference be more than Vgs(th), N-type MOSFET31 conductings, i.e. VCC-VS≧Vgs(th), when external voltage is more than preset value,
The transient voltage for being added in N-type MOSFET31 source electrode is Vmax, now VCC-Vmax<Vgs(th), so that N-type MOSFET disconnects, by
Can be in the range of nanosecond (ns) level, so as to the extraneous surge voltage pair of cut-out in time in N-type MOSFET31 turn-off speed
The impact of earphone audio amplifier.
By above-mentioned analysis, the magnitude of voltage that power supply 4 is exported need to meet following relation：
VS+Vgs(th)≦VCC<Vgs(th)+Vmax
The magnitude of voltage that i.e. power supply 4 is exported, the magnitude of voltage and the sum of threshold voltage exported more than earphone audio amplifier 1, and
The surge voltage value that can be born less than earphone audio amplifier 1 and threshold voltage and, can basis so that when designing circuit
Need to select suitable power supply and N-type MOSFET31.
Further it will be understood that due to being also formed with antiparallel two between the drain and source in N-type MOSFET31
Pole pipe 32, as shown in figure 3, MOSFET31 is accessed in circuit by form shown in Fig. 3, it is ensured that when high voltage is from earphone base
2 when coming in, N-type MOSFET31, and diode 32 reversely ends, it is ensured that high voltage will not be leaked to earphone audio amplifier for a long time
On 1.
Or, if switch module 3 is NPN triode 33, switch module 3 and earphone audio amplifier 1 and earphone socket 2
Annexation as shown in figure 4, Fig. 4 be switch module be NPN type triode 33 when earphone interface circuit structural representation.
As shown in figure 4, the colelctor electrode c of the NPN triode 33 is connected with the earphone socket 2, the NPN triode 33
Emitter e be connected with the earphone audio amplifier 1；
The base stage b of the NPN triode 33 is connected with power supply 4, and the magnitude of voltage that the power supply 4 is exported is less than or equal to described
Preset value and the NPN triode 33 cut-in voltage and.
Specifically, generally, the magnitude of voltage that earphone audio amplifier 1 is exported is less than or equal to its voltage value, and it can
The surge voltage value born is more than under its voltage value, i.e. normal operating conditions, the voltage that earphone audio amplifier 1 is exported,
The surge voltage value that can be born less than it.And the turn-on condition of NPN type triode 33 is the voltage difference for loading base stage b and emitter e
VbeMore than its cut-in voltage Von。
Specifically, when circuit form connection as shown in Figure 4, under normal operating conditions, the transmitting of NPN type triode 33
Pole tension Ve is the voltage that earphone audio amplifier 1 is exported, and now, the output voltage VCC of power supply 4 and earphone audio amplifier 1 are defeated
The voltage Ve gone out difference is more than Von, and NPN type triode 33 is turned on, i.e. VCC-Ve≤Von, when external voltage is more than preset value
When, the transient voltage for being added in the colelctor electrode c of NNPN types triode 33 is in Vmax, the emitter e of corresponding NPN type triode 33
Transient voltage be Vmax, now VCC-Vmax<Von, so that NPN type triode 33 disconnects, due to the pass of NPN type triode 33
Disconnected speed can also be in the range of nanosecond (ns) level, so as to the extraneous surge voltage of cut-out in time to earphone audio amplifier
Impact.
By above-mentioned analysis, the magnitude of voltage that power supply 4 is exported need to meet following relation：
Ve+Von≦VCC<Von+Vmax
The magnitude of voltage that i.e. power supply 4 is exported, the magnitude of voltage and the sum of cut-in voltage value exported more than earphone audio amplifier 1,
And the surge voltage value that can be born less than earphone audio amplifier 1 and cut-in voltage value and, can be with so that in design circuit
Suitable power supply and NPN type triode are selected as needed.
Further, in order to prevent the electric current that power supply 4 is added on switch module 3 too big, and switch module 3 is damaged, such as Fig. 3
Or the form shown in Fig. 4, the interface circuit, also include：
It is serially connected in the first resistor 5 between the switch module 3 and the power supply 4.
Specifically, the size of first resistor 5, can be according to the driving current size and the electricity of power supply 4 needed for switch module 3
The big lower determination of pressure.
In addition, as shown in figure 3 or 4, the first electric capacity 6 and the pole of voltage stabilizing two can also be concatenated between first resistor 5 and ground GND
Pipe 7, come the voltage swing of the control end that controls to be added in switch module 3, and ensures the stabilization of the voltage.
In a kind of possible way of realization of the present embodiment, in order to ensure that switch module 3, in conducting, flows through switch module
3 electric current is unlikely to excessive, as shown in figure 3 or 4, can also concatenate second between switch module 3 and earphone audio amplifier 1
Resistance 8.
Further, transient diode 9, such as Fig. 3 or 4 can also be accessed in the junction of switch module 3 and earphone socket 2
Shown, the other end of transient diode 9 is connected with ground GND, so that when having surge voltage at earphone socket 2, transient diode 9
The high impedance of its two interpolar can be changed into Low ESR, up to thousands of watts of wave is absorbed with the speed of 10 minus 12 power second-time
Power is gushed, makes the voltage clamps of two interpolars in a predetermined value, effectively other devices in earphone interface circuit, from various
The damage of surge pulse.
It is understood that in the earphone interface circuit, as shown in Figures 3 and 4, Inductive component 10 and electric capacity can also be included
Component 11, to be filtered to the sound signal that earphone audio amplifier is exported, improves the electromagnetic interference performance of circuit, is posed to sound
The quality of frequency signal.
Wherein, Inductive component 10 is serially connected between the switch module 3 and described earphone socket 2；Capacitance component 11
One end is connected with one end of the Inductive component 10, and the other end is connected with described ground GND.
It should be noted that the earphone audio amplifier 1 of terminal device includes L channel passage and R channel passage, therefore
, can be in L channel in order to avoid surge voltage is instead filled to earphone audio amplifier 1 by L channel passage or R channel passage
Concatenate switch module 3 respectively in passage and R channel passage, i.e., as shown in Fig. 2 switch module 3 include respectively with the L channel
Channel attached first switch 34 and with the channel attached second switch of the R channel 35.
Below so that switch module 3 is N-type MOSFET as an example, knot and Fig. 5 are carried out more detailed to the earphone interface that the application is provided
Thin explanation.As shown in figure 5, earphone audio amplifier 1 includes 4 output ends HPMIC, HPRP (R channel passage), a HPLP (left sides
Sound channel passage) and HPDET, wherein sound signal without HPMIC and HPDET passages, therefore only need in L channel passage and
N-type MOSFET pipes 31a and 31b are accessed in R channel passage.It can be sealed between 31a and earphone audio amplifier 1 accordingly
Second resistance 81, can seal in second resistance 82 between 31b and earphone audio amplifier 1.Pass through the earphone interface shown in Fig. 5
Circuit, you can prevent that the surge voltage in earphone socket 3 from pouring in earphone audio amplifier by L channel passage, ear can be prevented again
Surge voltage in machine transplanting of rice seat 3 by sound channel passage by pouring in earphone audio amplifier.
The earphone interface circuit that the embodiment of the present application is provided, by being accessed between earphone audio amplifier and earphone socket
Switch module, when the voltage at earphone socket is less than or equal to preset value, switch module is in the conduction state, in the earphone
When voltage in socket is higher than preset value, switch module is off, so as to effectively prevent the wave of external equipment generation
Gush voltage and damage earphone audio amplifier, improve the safety and reliability of earphone audio amplifier, improve Consumer's Experience.
In order to realize above-described embodiment, the application also proposes a kind of terminal device.
The structural representation for the terminal device that Fig. 6 provides for the embodiment of the present application.
As shown in fig. 6, the terminal device that the present embodiment is provided, including：Housing 61, processor 62, memory 63, circuit board
64 and power circuit 65, wherein, the circuit board 64 is placed in the interior volume that the housing 61 is surrounded, and the circuit board 64
On be provided with earphone interface circuit 641 as shown in above-mentioned embodiment, the processor 62 and the memory 63 are arranged on institute
State on circuit board 64；The power circuit 65, for being powered for each circuit or device of the terminal device；The memory
63 are used to store executable program code；The processor 62 is by reading the executable program generation stored in the memory 63
Code runs program corresponding with the executable program code.
It should be noted that the foregoing explanation to earphone interface circuit embodiment is also applied for the terminal of the embodiment
Equipment, its realization principle is similar, and here is omitted.
The terminal device of the embodiment of the present application, by accessing switches set between earphone audio amplifier and earphone socket
Part, when the voltage at earphone socket is less than or equal to preset value, switch module is in the conduction state, in the earphone socket
Voltage be higher than preset value when, switch module is off, thus effectively prevent external equipment generation surge voltage
Earphone audio amplifier is damaged, reliability of the safety and reliability there is provided terminal device of earphone audio amplifier is improved
Property, improve Consumer's Experience.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the application or example.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office
Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area
Art personnel can be tied the not be the same as Example or the feature of example and non-be the same as Example or example described in this specification
Close and combine.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include at least one this feature.In the description of the present application, " multiple " are meant that at least two, such as two, three
It is individual etc., unless otherwise specifically defined.
Any process described otherwise above or method description are construed as in flow chart or herein, represent to include
Module, fragment or the portion of the code of one or more executable instructions for the step of realizing specific logical function or process
Point, and the scope of the preferred embodiment of the application includes other realization, wherein can not be by shown or discussion suitable
Sequence, including according to involved function by it is basic simultaneously in the way of or in the opposite order, carry out perform function, this should be by the application
Embodiment person of ordinary skill in the field understood.
Represent in flow charts or logic and/or step described otherwise above herein, for example, being considered use
In the order list for the executable instruction for realizing logic function, it may be embodied in any computer-readable medium, for
Instruction execution system, device or equipment (such as computer based system including the system of processor or other can be held from instruction
The system of row system, device or equipment instruction fetch and execute instruction) use, or combine these instruction execution systems, device or set
It is standby and use.For the purpose of this specification, " computer-readable medium " can any can be included, store, communicate, propagate or pass
Defeated program is for instruction execution system, device or equipment or the dress for combining these instruction execution systems, device or equipment and using
Put.The more specifically example (non-exhaustive list) of computer-readable medium includes following：Electricity with one or more wirings
Connecting portion (electronic installation), portable computer diskette box (magnetic device), random access memory (RAM), read-only storage
(ROM), erasable edit read-only storage (EPROM or flash memory), fiber device, and portable optic disk is read-only deposits
Reservoir (CDROM).In addition, can even is that can be in the paper of printing described program thereon or other are suitable for computer-readable medium
Medium, because can then enter edlin, interpretation or if necessary with it for example by carrying out optical scanner to paper or other media
His suitable method is handled electronically to obtain described program, is then stored in computer storage.
It should be appreciated that each several part of the application can be realized with hardware, software, firmware or combinations thereof.Above-mentioned
In embodiment, the software that multiple steps or method can in memory and by suitable instruction execution system be performed with storage
Or firmware is realized.If, and in another embodiment, can be with well known in the art for example, realized with hardware
Any one of row technology or their combination are realized：With the logic gates for realizing logic function to data-signal
Discrete logic, the application specific integrated circuit with suitable combinational logic gate circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
Those skilled in the art are appreciated that to realize all or part of step that above-described embodiment method is carried
Rapid to can be by program to instruct the hardware of correlation to complete, described program can be stored in a kind of computer-readable storage medium
In matter, the program upon execution, including one or a combination set of the step of embodiment of the method.
In addition, each functional unit in the application each embodiment can be integrated in a proxy module, can also
That unit is individually physically present, can also two or more units be integrated in a module.Above-mentioned integrated mould
Block can both be realized in the form of hardware, it would however also be possible to employ the form of software function module is realized.The integrated module is such as
Fruit is realized using in the form of software function module and as independent production marketing or in use, can also be stored in a computer
In read/write memory medium.
Storage medium mentioned above can be read-only storage, disk or CD etc..Although having been shown and retouching above
Embodiments herein is stated, it is to be understood that above-described embodiment is exemplary, it is impossible to be interpreted as the limit to the application
System, one of ordinary skill in the art can be changed to above-described embodiment, change, replace and become within the scope of application
Type.
Claims (10)
1. a kind of earphone interface circuit, it is characterised in that including：Earphone audio amplifier and switch module；Wherein, the switch
One end of component is connected with the earphone audio amplifier, and the other end of the switch module is connected with earphone socket；
When voltage in the earphone socket is less than or equal to preset value, the switch module is in the conduction state, described
When voltage in earphone socket is higher than preset value, the switch module is off.
2. interface circuit as claimed in claim 1, it is characterised in that the earphone audio amplifier includes：L channel passage
With R channel passage；
The switch module includes being connected with the channel attached first switch of the L channel and with the R channel passage respectively
Second switch.
3. interface circuit as claimed in claim 1, it is characterised in that the switch module is N-type metal-oxide semiconductor (MOS)
FET；
The drain electrode of the N-type metal oxide semiconductor field effect tube is connected with the earphone socket, the N-type metal oxide
The source electrode of semiconductor field is connected with the earphone audio amplifier；
The grid of the N-type metal oxide semiconductor field effect tube is connected with power supply, and the magnitude of voltage of the power supply output is less than
The preset value and the N-type metal oxide semiconductor field effect tube threshold voltage and.
4. interface circuit as claimed in claim 1, it is characterised in that the switch module is NPN triode；
The colelctor electrode of the NPN triode is connected with the earphone socket, the emitter stage of the NPN triode and the earphone sound
Audio amplifier is connected；
The base stage of the NPN triode is connected with power supply, the magnitude of voltage of power supply output be less than or equal to the preset value with
The sum of the cut-in voltage of the NPN triode.
5. the interface circuit as described in claim 3 or 4 is any, it is characterised in that also include：Be serially connected in the switch module and
First resistor between the power supply.
6. interface circuit as claimed in claim 5, it is characterised in that also include：Be connected to the first resistor one end and
The first electric capacity and voltage-regulator diode between ground.
7. interface circuit as claimed in claim 1, it is characterised in that also include：It is connected on the switch module and the ear
Second resistance between machine audio amplifier.
8. interface circuit as claimed in claim 7, it is characterised in that also include：One end and the switch module and the ear
Machine transplanting of rice seat connection, the transient diode that the other end is connected to ground.
9. interface circuit as claimed in claim 8, it is characterised in that also include：It is serially connected in the switch module and the ear
Inductive component between machine transplanting of rice seat；
It is serially connected in the capacitance component between one end of the Inductive component and the ground.
10. a kind of terminal device, it is characterised in that including：Housing, processor, memory, circuit board and power circuit, wherein,
The circuit board, which is placed in the interior volume that the housing is surrounded, and the circuit board, sets any just like claim 1-9
Described earphone interface circuit, the processor and the memory are arranged on the circuit board；The power circuit, is used for
Powered for each circuit or device of the terminal device；The memory is used to store executable program code；The processing
Device runs journey corresponding with the executable program code by reading the executable program code stored in the memory
Sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621334653.4U CN206323526U (en) | 2016-12-06 | 2016-12-06 | Earphone interface circuit and terminal device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621334653.4U CN206323526U (en) | 2016-12-06 | 2016-12-06 | Earphone interface circuit and terminal device |
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| CN206323526U true CN206323526U (en) | 2017-07-11 |
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| CN201621334653.4U Active CN206323526U (en) | 2016-12-06 | 2016-12-06 | Earphone interface circuit and terminal device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107404680A (en) * | 2017-08-07 | 2017-11-28 | 东莞市云仕电子有限公司 | A kind of circuit structure, adapter and earphone for reducing earpiece sound pressures |
| CN111525499A (en) * | 2019-02-01 | 2020-08-11 | 北京小米移动软件有限公司 | Electronic device |
| WO2021102634A1 (en) * | 2019-11-25 | 2021-06-03 | Tridonic Gmbh & Co Kg | Source circuit and power supply and electric system |
-
2016
- 2016-12-06 CN CN201621334653.4U patent/CN206323526U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107404680A (en) * | 2017-08-07 | 2017-11-28 | 东莞市云仕电子有限公司 | A kind of circuit structure, adapter and earphone for reducing earpiece sound pressures |
| CN111525499A (en) * | 2019-02-01 | 2020-08-11 | 北京小米移动软件有限公司 | Electronic device |
| WO2021102634A1 (en) * | 2019-11-25 | 2021-06-03 | Tridonic Gmbh & Co Kg | Source circuit and power supply and electric system |
| CN114731040A (en) * | 2019-11-25 | 2022-07-08 | 赤多尼科两合股份有限公司 | Source circuit, power supply, and electrical system |
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Address after: Changan town in Guangdong province Dongguan 523860 usha Beach Road No. 18 Patentee after: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., Ltd. Address before: Changan town in Guangdong province Dongguan 523860 usha Beach Road No. 18 Patentee before: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., Ltd. |