CN209314021U

CN209314021U - The decision circuitry of earphone MIC positive and negative terminal and the electronic equipment that earphone can be accessed

Info

Publication number: CN209314021U
Application number: CN201920426749.0U
Authority: CN
Inventors: 陶红霞
Original assignee: Shanghai Yuehuo Microelectronics Co Ltd
Current assignee: Shanghai Yuehuo Microelectronics Co Ltd; Shanghai Yaohuo Microelectronics Co Ltd
Priority date: 2019-03-29
Filing date: 2019-03-29
Publication date: 2019-08-27
Anticipated expiration: 2029-03-29

Abstract

The utility model provides a kind of decision circuitry of earphone MIC positive and negative terminal and can access the electronic equipment of earphone, comprising: constant pressure source module, current detection module and control module；The constant pressure source module is used for any one the current target side being connected in the both ends of MIC by the control module, to export constant pressure to the target side；The current detection module connects the constant pressure source module, to detect the target current data when constant pressure source module exports the constant pressure；The current detection module connects the control module, to send to the control module for the target current data as one of the judgment basis of the MIC positive and negative terminal.The utility model is in such a way that input constant pressure detects electric current; current data for judging MIC positive and negative terminal can be provided to control module; compared to the mode of the existing constant current of injection in the related technology detection voltage; the utility model can avoid voltage and exceed amplitude, and then can be conducive to avoid the generation of device operation irregularity or erroneous detection.

Description

The decision circuitry of earphone MIC positive and negative terminal and the electronic equipment that earphone can be accessed

Technical field

The utility model relates to earphone field more particularly to a kind of decision circuitry of earphone MIC positive and negative terminal and ear can be accessed The electronic equipment of machine.

Background technique

Type-C earphone, it can be understood as the external interface of the earphone is standardized based on USB Type-C, wherein USB Type-C, referred to as USB-C are a kind of hardware interface specifications of universal serial bus (USB).The external interface of Type-C earphone It can support blindmate, i.e., positive and negative grafting.However, using in the electronic equipment of the earphone, only judge to be currently inserted into The positive electrode and negative electrode of MIC in earphone judge that the MIC is just to connect or be reversely connected, could correctly transmit signal.

It is existing in the related technology, in order to judge that MIC is just to connect or be reversely connected, can earphone be inserted into when successively implement with Lower two steps, the first step, the second end for controlling MIC are connected to ground through analog switch, such as can pass through the SBU2 foot for connecting the second end Then analog switch ground connection injects an exciting current in the first end of MIC, such as can be in the SBU1 foot for connecting the first end Exciting current is injected, the voltage V1 of SBU1 foot at this time is then detected in the way of ADC；Second step, the first end warp for controlling MIC Analog switch is connected to ground, such as can be grounded the SBU1 foot for connecting the first end through analog switch, then infuses in the second end of MIC Enter same exciting current, such as exciting current can be entered in the SBU2 footnote of connection second end, is then examined in the way of ADC Survey the voltage V2 of SBU2 foot at this time.At this point, can determine whether the of the MIC that SBU1 foot is connected if obtaining V2 > V1 > preset value One end is cathode, and the second end for the MIC that SBU2 foot is connected is anode；If finally obtained: V1 > V2 > preset value can determine whether The first end of the corresponding MIC of SBU1 foot is anode, and the second end of the corresponding MIC of SBU2 foot is cathode.Preset value therein can be with For empirical value.

It is existing in the related technology, exciting current is loaded by the SBU1 foot and SBU2 foot of Type C interface, SBU1 Impedance between foot and SBU2 foot may be exceeded, so that measuring voltage is more than normal accessible voltage amplitude, leads to device work Make exception or erroneous detection.As it can be seen that by the way of injection constant current detection voltage device work may be led to because voltage exceeds amplitude Make exception or erroneous detection.

Utility model content

The utility model provides a kind of decision circuitry of earphone MIC positive and negative terminal and can access the electronic equipment of earphone, with solution Certainly by the way of injection constant current detection voltage, asking for device operation irregularity or erroneous detection may be led to because voltage exceeds amplitude Topic.

It is according to the present utility model in a first aspect, providing a kind of decision circuitry of earphone MIC positive and negative terminal, comprising: constant pressure Source module, current detection module and control module；

The constant pressure source module is used for any one the current mesh being connected in the both ends of MIC by the control module End is marked, to export constant pressure to the target side；

The current detection module connects the constant pressure source module, when exporting the constant pressure to detect the constant pressure source module Target current data；

The current detection module connects the control module, is used for using sending to the control module as the MIC The target current data of one of the judgment basis of positive and negative terminal.

Optionally, the constant pressure source module includes switching device and operational amplifier block；

The first end of the switching device connects the current detection module, and the second end of the switching device is for accessing The target side；The control terminal of the switching device connects the output end of the operational amplifier block；

The first input end of the operational amplifier block, which accesses, reference voltage, and the second of the operational amplifier block Input terminal accesses the constant pressure；The operational amplifier block is used for the voltage difference according to two input terminals, opens described in control Device is closed, so that the constant pressure matches with the reference voltage.

Optionally, the switching device is field-effect tube NMOS, and the first end of the NMOS drains for it, the NMOS's Second end is its source electrode, and the control terminal of the NMOS is its gate pole.

Optionally, the current detection module connects the first end of the switching device.

Optionally, the control module is also used to connect another current non-targeted end in the both ends of the MIC, with Control the non-targeted end ground connection.

Optionally, the control module is used for while connecting the both ends of the MIC, in the first state by the MIC Both ends in any one first end as the target side under the first state, and: in the second condition by the MIC's Another second end is as the target side under second state in both ends；

The target current data include examining under the first state for the judgment basis as the MIC positive and negative terminal The second current data detected under the first current data and second state that measure.

Optionally, the control module is also connected with the end MIC and the ground terminal of audio frequency processing circuit, for the MIC's After positive and negative terminal is determined, the anode for controlling the MIC is connected to the end MIC, and the negative terminal of the MIC is connected to the ground connection End.

Second aspect according to the present utility model provides a kind of electronic equipment that can access earphone, including first aspect And its decision circuitry of earphone MIC positive and negative terminal that optinal plan is related to.

Optionally, the electronic equipment further includes interface module；The interface module connects the control module；Institute Interface module is stated for connecting the first end and second end of the MIC.

Optionally, the interface module includes between the first end and the control module for being connected to the MIC Second interface component between first interface component, and second end and the control module for being connected to the MIC.

Optionally, the electronic equipment is following one of any: mobile phone, computer, tablet computer and verbal system.

The decision circuitry of earphone MIC positive and negative terminal provided by the utility model and the electronic equipment that can access earphone, pass through electricity The design of line structure, any end realized in MIC inputs constant pressure, and detects current data when inputting constant pressure, in turn, this Utility model can provide the electric current for judging MIC positive and negative terminal in such a way that input constant pressure detects electric current to control module Data, compared to the mode of the existing constant current of injection in the related technology detection voltage, the utility model can avoid voltage and exceed amplitude, And then it can be conducive to avoid the generation of device operation irregularity or erroneous detection.

Using the utility model relates to circuit judges MIC positive and negative terminal when, can be first in the utility model optinal plan First end using control module in MIC inputs constant pressure, and the second end of MIC is grounded through analog switch, detects constant pressure source mould at this time First current data I of block₁, recycle second end of the control module in MIC to input constant pressure, the first end of MIC is through analog switch Ground connection detects the second current data I of constant pressure source module at this time₂；If I₁Less than I₂, then it can deduce that the first end of MIC is anode, Second end is negative terminal；If I₂Less than I₁, then can deduce that the first end of MIC is negative terminal, second end is anode.

Detailed description of the invention

In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property It puts, is also possible to obtain other drawings based on these drawings.

Fig. 1 is a kind of circuit diagram one of the decision circuitry of earphone MIC positive and negative terminal in the utility model embodiment；

Fig. 2 is a kind of circuit diagram two of the decision circuitry of earphone MIC positive and negative terminal in the utility model embodiment；

Fig. 3 is a kind of schematic illustration one of the decision circuitry of earphone MIC positive and negative terminal in the utility model embodiment；

Fig. 4 is a kind of schematic illustration two of the decision circuitry of earphone MIC positive and negative terminal in the utility model embodiment；

Fig. 5 is a kind of circuit diagram three of the decision circuitry of earphone MIC positive and negative terminal in base the utility model embodiment；

Fig. 6 is a kind of circuit diagram one of control module in the utility model embodiment；

Fig. 7 is a kind of circuit diagram two of control module in the utility model embodiment；

Fig. 8 is the circuit diagram of a kind of electronic equipment in the utility model embodiment.

Description of symbols:

1-MIC；

The decision circuitry of 2- earphone MIC positive and negative terminal；

21- constant pressure source module；

211- operational amplifier block；

212- switching device；

22- current detection module；

23- control module；

231- controls chip；

The first control switch of 232-；

The second control switch of 233-；

234- third control switch；

The 4th control switch of 235-；

24- power supply；

25- interface module；

251- first interface component；

252- second interface component；

3- audio frequency processing circuit；

4- electronic equipment.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work Every other embodiment obtained, fall within the protection scope of the utility model.

The specification and claims of the utility model and term " first " in above-mentioned attached drawing,

The (if present)s such as " second ", " third " " the 4th " are to be used to distinguish similar objects, without for describing spy Fixed sequence or precedence.It should be understood that the data used in this way are interchangeable under appropriate circumstances, so as to described herein The embodiments of the present invention can be performed in other sequences than those illustrated or described herein.In addition, term " packet Include " and " having " and their any deformation, it is intended that cover it is non-exclusive include, for example, containing series of steps Or the process, method, system, product or equipment of unit those of are not necessarily limited to be clearly listed step or unit, but can wrap Include other step or units being not clearly listed or intrinsic for these process, methods, product or equipment.

The technical solution of the utility model is described in detail with specifically embodiment below.These are specific below Embodiment can be combined with each other, and the same or similar concept or process may be repeated no more in some embodiments.

Fig. 1 is a kind of circuit diagram one of the decision circuitry of earphone MIC positive and negative terminal in the utility model embodiment.Fig. 2 It is a kind of circuit diagram one of the decision circuitry of earphone MIC positive and negative terminal in the utility model embodiment.

The decision circuitry of earphone MIC positive and negative terminal involved in the utility model embodiment can be applied in Type-C earphone, The positive and negative terminal of its MIC is judged.Wherein, earphone may include MIC1.

MIC1 therein, it can be understood as the combination of device or device that external voice signal is acquired and is transmitted, It has anode and negative terminal, the anode and negative terminal of MIC21 to inside and outside, it will be appreciated that are as follows: audio frequency processing circuit is connected in its anode Anode, and the negative terminal of its negative terminal and audio frequency processing circuit altogether after, the transmission of external voice signal may be implemented so that Audio frequency processing circuit can carry out relevant treatment to voice signal.Wherein, the anode of audio frequency processing circuit also is understood as MIC End, negative terminal also are understood as ground terminal.

In addition, the judgement to MIC1 positive and negative terminal, the judgement that also is understood as just meeting MIC1 or be reversely connected；Wherein, judge It is positive and connects, can for example be interpreted as the anode that MIC1 is judged and be currently connected to the end MIC of audio frequency processing circuit, MIC1 is known Not Chu negative terminal be currently connected to the ground terminal of audio frequency processing circuit, conversely, being judged as reversal connection, can for example be interpreted as MIC1 institute The anode judged is currently connected to the ground terminal of audio frequency processing circuit, and the negative terminal that MIC is identified is currently connected to sound The end MIC of frequency processing circuit.

Please refer to Fig. 1 and Fig. 2, the decision circuitry 2 of earphone MIC positive and negative terminal, comprising: constant pressure source module 21, current detecting mould Block 22 and control module 23.

Any one of the constant pressure source module 21 for being connected in the both ends of MIC by the control module 23 is current Target side, with to the target side export constant pressure.

Wherein, constant pressure source module 21, can be by controlling mould after the decision circuitry 2 of earphone access earphone MIC positive and negative terminal Block 23 is connect with target side, so, it will be understood that are as follows: control module 23, will be described for connecting with the target side of MIC1 Constant pressure source module 21 supply constant voltage output to MIC1 target side.

In one of embodiment, referring to FIG. 2, the constant pressure source module 21 includes that switching device 212 is put with operation Big component 211.

The first end of the switching device 212 connects the current detection module 22, the second end of the switching device 212 For accessing the target side；The control terminal of the switching device 212 connects the output end of the operation amplifier component 211.

The first end of the switching device 212, which also can access, power supply 24, which can be electronic equipment existing Meaning can provide the combination of the device or device of electric energy, or the included power supply of current detection module 22, or separately What is be arranged is capable of providing the combination of the device or device of electric energy, can also be power supply provided in control module 23, for example, In non-Fig. 2 illustrated embodiment, the first end of switching device 212 can link control module 23, mentioned with receiving in control module 23 The power supply power supply of confession.

Switching device 212 can be any device with first end, second end and control terminal, such as can be Metal-oxide-semiconductor, in one of embodiment, switching device 212 can be field-effect tube NMOS, NMOS therein, specifically: N- Metal-Oxide-Semiconductor。

If switching device 212 is NMOS: the first end of switching device 212 described above, the as leakage of NMOS Pole, the second end of switching device 212 described above, the as source electrode of NMOS, the control of switching device 212 described above End processed, the as gate pole of NMOS.

The first input end access of the operation amplifier component 211 has reference voltage Vref, the operational amplifier block 211 the second input terminal accesses the constant pressure；The operational amplifier block 211 is used for the voltage difference according to two input terminals Value, controls the switching device 212, so that the constant pressure matches with the reference voltage.

Specifically it can be regarded as: after earphone accesses operational amplifier block, the second input terminal of operational amplifier block 211 It can be connected to target side, and then can access the constant pressure for being input to target side, operational amplifier block 211 is according to constant pressure and with reference to electricity Press V_refDifference, switching device 212 can be controlled.

In one of embodiment, operational amplifier block 211 can be lower than reference voltage V in constant pressure_refWhen, according to two The difference of person, the conducting degree of control switch device 212, for example, conducting degree is also lower by control therewith when difference is lower； It is higher than reference voltage V in constant pressure_refWhen, according to the difference of the two, the shutdown degree of control switch device 212, such as difference are got higher When, shutdown degree is also got higher by control therewith, in turn so that constant pressure be able to maintain in dynamic change it is constant, this it is constant can be with For such as reference voltage V_refSuch a specific value, or with reference voltage V_refAn associated value range.

In specific implementation process, the V_ref1.5V can be taken.

In the utility model embodiment, the current detection module 22 connects the constant pressure source module 21, described in detection Constant pressure source module 21 exports the target current data when constant pressure.

Target current data, it can be understood as constant pressure source module 21 exports the current data of electric current when exporting constant pressure, or Another current data associated with the current data.In one of embodiment, current detection module 22 be can connect To the first end of switching device 212, and then the electric current of 212 first end of switching device is collected as target current data.

Current detection module 22 can be the set of device or device that target current data are acquired by ADC mode, The data mode of its target current data for being sent to control module 23 is also possible to the data of digital signal.

The current detection module 22 connects the control module 23, is used for using sending to the control module 23 as institute State the target current data of one of judgment basis of MIC1 positive and negative terminal.

As it can be seen that design of the above scheme by circuit structure, any end realized in MIC inputs constant pressure, and detects Current data when inputting constant pressure can provide the current data for judging MIC positive and negative terminal in turn to control module, compared to The mode of the existing constant current of injection in the related technology detection voltage, the utility model can avoid voltage and exceed amplitude, and then can be advantageous In the generation for avoiding device operation irregularity or erroneous detection.

In one of embodiment, the control module 23 be also used to connect in the both ends of the MIC1 another work as Preceding non-targeted end, to control the non-targeted end ground connection.

The both ends of MIC1 are characterized as arbitrary first end and second end, then: if the first end is target side, and then defeated Enter constant pressure, then the second end is grounded；If the second end is target side, and then is entered constant pressure, then the first end is grounded.

The control module 23 is used for while connecting the both ends of the MIC1, in the first state by the two of the MIC Any one first end is as the target side under the first state in end, and: in the second condition by the both ends of the MIC In another second end as the target side under second state.

Wherein:

Using the first end of MIC1 as target side, it can be understood as constant pressure is inputted in the first end, by the second end of MIC1 Ground connection, corresponding, referred to above first state, it can be understood as the first end of MIC1 inputs constant pressure, when second end is grounded State；

Using the second end of MIC1 as target side, it can be understood as constant pressure is inputted in the second end, by the first end of MIC1 Ground connection, the second corresponding, referred to above state, it can be understood as the second end of MIC1 inputs constant pressure, when first end is grounded State.

Fig. 3 is a kind of schematic illustration one of the decision circuitry of earphone MIC positive and negative terminal in the utility model embodiment；Fig. 4 It is a kind of schematic illustration two of the decision circuitry of earphone MIC positive and negative terminal in the utility model embodiment.

In Fig. 3 and Fig. 4 illustrated embodiment, operational amplifier 211 is characterized using OP, and open using K1 characterization simulation It closes.

In specific implementation process, when judging MIC positive and negative terminal using decision circuitry involved in the above optinal plan, it please join Fig. 3 is examined, constant pressure can be inputted in the first end of MIC1 first with control module 23, the second end for controlling MIC1 connects through analog switch K1 Ground detects the first current data I of constant pressure source module at this time₁, referring to FIG. 4, recycling control module 23 is the of MIC1 Two ends input constant pressure, and the first end of MIC1 is grounded through analog switch K1, detect the second current data of constant pressure source module 21 at this time I₂；If I₁Less than I₂, then can deduce that the first end of MIC1 is anode, second end is negative terminal；If I₂Less than I₁, then can deduce MIC1's First end is negative terminal, and second end is anode.

The control module 23 is also connected with the end MIC and the ground terminal of audio frequency processing circuit 3, in the positive and negative of the MIC1 After end is determined, the anode for controlling the MIC1 is connected to the end MIC, and the negative terminal of the MIC is connected to the ground terminal.

Fig. 6 is a kind of circuit diagram one of control module in the utility model embodiment.

Referring to FIG. 6, control module 23 may include control chip 231, control chip 231 connects respectively using four ports It is connected to the anode of MIC1, the negative terminal of MIC1, the end MIC of audio frequency processing circuit 3 and the ground terminal of audio frequency processing circuit 3.In turn, lead to It crosses in control chip 231 and itself the anode of MIC1 and the MIC of audio frequency processing circuit 3 is realized to the definition of each port and conducting situation The connection of the ground terminal of the negative terminal and audio frequency processing circuit 3 of the connection and MIC1 at end.

Fig. 7 is a kind of circuit diagram two of control module in the utility model embodiment.

Referring to FIG. 7, control module 23 may include control chip 231, it may also include controlled coremaking piece 231 controls first Control switch 232, the second control switch 233, third control switch 234 and the 4th control switch 235, pass through four control switches Control, it can be achieved that the anode of MIC1 and the connection at the end MIC of audio frequency processing circuit 3 and the negative terminal of MIC1 and audio processing The connection of the ground terminal of circuit 3.

Due to the existing corresponding end for also needing to realize that the anode of MIC1, negative terminal correspond to audio frequency processing circuit 3 in the related technology Connection, so, the implementation of any existing way can meet the above demand, and not depart from retouching for the utility model embodiment It states.

Referring to FIG. 8, the electronic equipment 4 of earphone can be accessed, the earphone MIC positive and negative terminal that is related to including the above optinal plan Decision circuitry 2.

In one of embodiment, the electronic equipment 4 further includes interface module 25.

The interface module 25 connects the control module 25, and the interface module 25 is for connecting the first of the MIC1 End and second end.

In specific implementation process, the interface module 25 may include for be connected to the first end of the MIC1 with it is described First interface component 251 between control module 23, and second end and the control module for being connected to the MIC1 Second interface component 252 between 23.

In one of embodiment, the electronic equipment 4 is following one of any: mobile phone, computer, tablet computer, And verbal system.

In conclusion the decision circuitry of earphone MIC positive and negative terminal provided by the utility model is set with the electronics that can access earphone Standby, by the design of circuit structure, any end realized in MIC inputs constant pressure, and detects electric current number when inputting constant pressure According in turn, the utility model can be provided to control module for judging that MIC is positive and negative in such a way that input constant pressure detects electric current The current data at end, compared to the mode of the existing constant current of injection in the related technology detection voltage, the utility model can avoid voltage Beyond amplitude, and then it can be conducive to avoid the generation of device operation irregularity or erroneous detection.

Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of Technical characteristic is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and this is practical new The range of each embodiment technical solution of type.

Claims

1. a kind of decision circuitry of earphone MIC positive and negative terminal characterized by comprising constant pressure source module, current detection module and control Molding block；

The constant pressure source module is used for any one the current target being connected in the both ends of MIC by the control module End, to export constant pressure to the target side；

The current detection module connects the constant pressure source module, to detect the mesh when constant pressure source module exports the constant pressure Mark current data；

The current detection module connects the control module, to send to the control module for positive and negative as the MIC The target current data of one of the judgment basis at end.

2. the decision circuitry of earphone MIC positive and negative terminal according to claim 1, which is characterized in that the constant pressure source module packet Include switching device and operational amplifier block；

The first end of the switching device connects the current detection module, and the second end of the switching device is described for accessing Target side；The control terminal of the switching device connects the output end of the operational amplifier block；

The first input end access of the operational amplifier block has reference voltage, the second input of the operational amplifier block It terminates into the constant pressure；The operational amplifier block is used for the voltage difference according to two input terminals, controls the derailing switch Part, so that the constant pressure matches with the reference voltage.

3. the decision circuitry of earphone MIC positive and negative terminal according to claim 2, which is characterized in that the switching device is field Effect pipe NMOS, the first end of the NMOS drain for it, and the second end of the NMOS is its source electrode, the control terminal of the NMOS For its gate pole.

4. the decision circuitry of earphone MIC positive and negative terminal according to claim 1, which is characterized in that the control module is also used Another current non-targeted end in the both ends for connecting the MIC, to control the non-targeted end ground connection.

5. the decision circuitry of earphone MIC positive and negative terminal according to any one of claims 1 to 4, which is characterized in that the control Module is used for while connecting the both ends of the MIC, in the first state to make any one first end in the both ends of the MIC For the target side under the first state, and: in the second condition using another second end in the both ends of the MIC as institute State the target side under the second state；

The target current data include detecting under the first state for the judgment basis as the MIC positive and negative terminal The first current data and second state under the second current data for detecting.

6. the decision circuitry of earphone MIC positive and negative terminal according to any one of claims 1 to 4, which is characterized in that the control Module is also connected with the end MIC and the ground terminal of audio frequency processing circuit, for after the positive and negative terminal of the MIC is determined, described in control The anode of MIC is connected to the end MIC, and the negative terminal of the MIC is connected to the ground terminal.

7. a kind of electronic equipment that can access earphone, which is characterized in that including earphone MIC as claimed in any one of claims 1 to 6 The decision circuitry of positive and negative terminal.

8. electronic equipment according to claim 7, which is characterized in that further include interface module；The interface module connection The control module；The interface module is used to connect the first end and second end in the both ends of the MIC.

9. the electronic equipment according to claim 8 that earphone can be accessed, which is characterized in that the interface module includes being used for The first interface component being connected between the first end of the MIC and the control module, and for being connected to the MIC's Second interface component between second end and the control module.

10. the electronic equipment according to any one of claims 7 to 9 that earphone can be accessed, which is characterized in that the electronics is set Standby is following one of any: mobile phone, computer, tablet computer and verbal system.