CN109348344B - Electrostatic protection structure, earphone adapter and electronic equipment - Google Patents
Electrostatic protection structure, earphone adapter and electronic equipment Download PDFInfo
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- CN109348344B CN109348344B CN201811413492.1A CN201811413492A CN109348344B CN 109348344 B CN109348344 B CN 109348344B CN 201811413492 A CN201811413492 A CN 201811413492A CN 109348344 B CN109348344 B CN 109348344B
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- audio
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- earphone
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1091—Details not provided for in groups H04R1/1008 - H04R1/1083
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
Abstract
The invention discloses an electrostatic protection structure, an earphone adapter and an electronic device, wherein the electrostatic protection structure comprises: the audio female seat is configured to be plugged with the earphone; an electrical connector configured to connect with an audio input/output interface of an electronic device; the electrostatic protection trigger circuit is arranged between the audio female seat and the electric connector in series; the audio socket is configured to absorb the electrostatic interference signal and disconnect the electrical connection between the audio socket and the electrical connector when the audio socket has the electrostatic interference signal input. The invention can effectively protect the audio mother seat and the rear-stage circuit module, thereby prolonging the service life of the earphone adapter or the electronic equipment.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to an electrostatic protection structure, an earphone adapter and electronic equipment.
Background
In the electronic device or the earphone adapter, due to the structure and the use limitation of the audio female, the metal part may need to be exposed to contact, thereby easily generating electrostatic interference due to contact, friction, and radiation of the electronic device.
Disclosure of Invention
The invention mainly aims to provide an electrostatic protection structure and electronic equipment, and aims to prevent an earphone seat from being damaged by electrostatic interference and prolong the service life of an earphone adapter structure.
In order to achieve the above object, the present invention provides an electrostatic protection structure for connecting an audio input/output interface of an electronic device and an earphone, the electrostatic protection structure comprising:
the audio female seat is configured to be plugged with the earphone;
an electrical connector configured to connect with an audio input/output interface of the electronic device;
the electrostatic protection trigger circuit is arranged between the audio female seat and the electric connector in series; the audio socket is configured to absorb the electrostatic interference signal and disconnect the electrical connection between the audio socket and the electrical connector when the audio socket has the electrostatic interference signal input.
Optionally, the audio socket comprises an earphone jack, a left sound channel pin and a right sound channel pin, the left sound channel pin and the right sound channel pin are arranged in the earphone jack, the number of the electrostatic protection trigger circuits is equal to that of the left sound channel pin and the right sound channel pin, the number of the electrostatic protection trigger circuits is equal to that of the first electrostatic protection trigger circuit and that of the second electrostatic protection trigger circuit are equal to that of the left sound channel pin and that of the right sound channel pin, and the first electrostatic protection trigger circuit and the second electrostatic protection trigger circuit are connected with the left sound channel pin and the right sound channel pin in a one-to-.
Optionally, the audio socket further includes a microphone access pin disposed in the earphone jack, and the electrostatic protection structure further includes a third electrostatic protection trigger circuit, where the electrostatic protection trigger circuit is serially connected between the microphone access pin and the electrical connection socket.
Optionally, each esd protection trigger circuit includes a first electronic switch and a first esd protection diode, a controlled terminal and a first input/output terminal of the first electronic switch are interconnected with a cathode of the first esd protection diode and the audio socket, and a second input/output terminal of the first electronic switch is connected with the electrical connector; the anode of the first electrostatic protection diode is grounded;
the first electrostatic protection diode is configured to absorb and clamp the electrostatic interference signal and trigger the first electronic switch to disconnect the electrical connection between the audio socket and the electrical connector.
Optionally, each of the esd protection triggering circuits includes a one-way conducting element, and the one-way conducting element is serially connected between the audio socket and the electrical connector.
Optionally, the electrostatic protection structure further includes an audio signal processing circuit, a first input/output end of the audio signal processing circuit is connected to the earphone seat, and a second input/output end of the audio signal processing circuit is connected to the electrical connector.
Optionally, the audio signal processing circuit includes a main controller and a codec, an input/output end of the main controller is a first input/output end of the audio signal processing circuit, the main controller is further connected to the codec, and an input/output end of the codec is a second input/output end of the audio signal processing circuit.
Optionally, the electrical connector is a USB-type C interface; alternatively, the electrical connector is an I2C communication interface.
Optionally, the audio female seat is a 3.5mm audio female seat.
The invention also provides an earphone adapter, which comprises the electrostatic protection structure.
The invention also provides electronic equipment which comprises an audio input/output interface and the electrostatic protection structure, wherein the audio input/output interface is connected with the electrostatic protection structure.
The electronic equipment is electrically connected with the earphone by arranging the audio female seat, the electric connector and the electrostatic protection trigger circuit and connecting the electrostatic protection trigger circuit between the electric connector and the audio female seat in series. When the electronic equipment works, an audio signal output by the electronic equipment is transmitted to the earphone through the electric connector, the electrostatic protection triggering single circuit and the audio mother seat, so that the audio signal is played; or the earphone receives the voice signal sent by the user, converts the voice signal into an audio signal and outputs the audio signal to the electronic equipment through the audio mother seat, the electrostatic protection triggering single circuit and the electric connector, so that the voice signal is recorded. When an electrostatic signal is generated in the audio female seat and forms an electrostatic interference signal, the electrostatic protection triggering single circuit absorbs the electrostatic interference signal and disconnects the electrical connection between the audio female seat and the electrical connector. Therefore, the electrostatic interference signals can be prevented from flowing into the earphone adapter or the electronic equipment along the audio female seat and the rear-stage circuit module, so that electronic elements in the earphone adapter or the electronic equipment are damaged, and the electronic equipment cannot work normally. The invention can effectively protect the audio mother seat and the rear-stage circuit module, thereby prolonging the service life of the earphone adapter or the electronic equipment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of an electrostatic discharge protection structure according to an embodiment of the present invention;
fig. 2 is a circuit structure diagram of an embodiment of the esd protection structure in fig. 1.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | Audio frequency mother seat | 42 | Coding and |
| 20 | |
100 | Earphone set |
| 30 | Electric |
200 | Electronic device |
| 31 | Main controller | R | Right sound channel foot |
| 32 | First electrostatic protection diode | L | Left sound track foot |
| 40 | Audio signal processing circuit | MIC | Microphone connecting pin |
| 41 | Main controller |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The present invention provides an electrostatic protection structure, which is applied to connect an audio input/output interface of an electronic device 200 and an earphone 100, and the electrostatic protection structure can be disposed in the electronic device 200 such as a mobile phone and a tablet computer, or disposed as an independent adaptor to connect the electronic device 200 and the earphone 100, which is not limited herein.
Referring to fig. 1 and 2, in an embodiment of the invention, the esd protection structure includes:
an audio female 10 configured to be plugged with the earphone 100;
an electrical connector 20 configured to connect with an audio input/output interface of the electronic apparatus 200;
the electrostatic protection trigger circuit 30 is arranged in series between the audio female socket 10 and the electrical connector 20; is configured to absorb the electrostatic interference signal and disconnect the electrical connection between the audio socket 10 and the electrical connector 20 when the audio socket 10 has the electrostatic interference signal input.
With the increasing popularization of the USB-Type C interface, many electronic devices 200 on the market, such as digital televisions, mobile phones, tablet computers, and the like, begin to cancel the conventional earphone socket (i.e., audio socket), and the wired connection of the earphone 100 is realized by plugging the Type C earphone 100 through the USB-Type C interface. Or the electronic device 200 provided with the USB-type C interface and the conventional earphone 100 are connected through the earphone adapter, so that the user can simultaneously adapt the electronic device 200 using the USB-type C interface and the conventional electronic device 200 provided with the earphone socket through one earphone adapter and one pair of earphones 100 without purchasing two pairs of earphones 100. In this embodiment, the audio socket 10 is used for the earphone 100 to be inserted into to connect with the earphone 100; the electrical connector 20 may be configured according to the configuration of the electrostatic protection structure, for example, when serving as an adaptor, the electrical connector 20 may be a USB-type C interface, so as to connect the electronic apparatus 200 using the USB-type C interface. Or as a Mini USB interface so as to connect the electronic apparatus 200 using the Mini USB interface. When the electrostatic protection structure is disposed in the electronic device 200, at this time, a conventional earphone socket disposed in the electronic device 200 is connected to the earphone 100, and the electrical connector 20 may be a communication interface, or an audio interface, such as an I2C communication interface, to implement communication connection between an audio module in the electronic device 200 and the earphone socket.
However, in the electronic device 200 or the earphone adapter, due to the structure and use limitation of the audio female housing 10, the metal portion may need to be exposed to contact, thereby easily generating electrostatic interference due to contact, friction, and radiation of the electronic device 200. The static electricity is accumulated for a long time, has a high voltage, a low power, a small current and a short action time, that is, once the static electricity is generated on the audio socket 10, the audio socket 10 may be burned in a short time, and even the static electricity flows into the earphone adapter or the electronic device 200 along the audio socket 10 and the rear-stage circuit module, so as to damage the electronic element in the earphone adapter or the electronic device 200, and the electronic device 200 may not work normally.
In order to solve the above problems, the present invention provides the audio mother socket 10, the electrical connector 20, and the esd protection triggering circuit 30 is serially connected between the electrical connector 20 and the audio mother socket 10, so as to electrically connect the electronic device 200 and the earphone 100. When the electronic device 200 works, the audio signal output by the electronic device 200 is transmitted to the earphone 100 through the electrical connector 20, the electrostatic protection triggering single circuit and the audio socket 10, so as to realize the playing of the audio signal; or the earphone 100 receives the voice signal sent by the user, converts the voice signal into an audio signal, and outputs the audio signal to the electronic device 200 through the audio female socket 10, the electrostatic protection triggering single circuit and the electrical connector 20, thereby implementing the recording of the voice signal. When an electrostatic signal is generated in the audio socket 10 and forms an electrostatic interference signal, the electrostatic protection triggering unit absorbs the electrostatic interference signal and disconnects the electrical connection between the audio socket 10 and the electrical connector 20. Therefore, it is possible to prevent the electrostatic interference signal from flowing into the earphone adapter or the electronic device 200 along the audio socket 10 and the rear-stage circuit module, and damaging the earphone adapter or the electronic components in the electronic device 200, which may cause the electronic device 200 to fail to operate normally. The present invention can effectively protect the audio jack 10 and the rear stage circuit module, thereby improving the service life of the earphone adapter or the electronic device 200.
Referring to fig. 1 and 2, in an embodiment, the audio mother 10 includes an earphone jack (not shown), and a left channel pin L and a right channel pin R disposed in the earphone jack, the number of the esd trigger circuits 30 corresponds to the left channel pin L and the right channel pin R, and is respectively a first esd trigger circuit 30 and a second esd trigger circuit 30, and the first esd trigger circuit 30 and the second esd trigger circuit 30 are connected to the left channel pin L and the right channel pin R in a one-to-one correspondence manner.
The audio female socket 10 further comprises a microphone access pin MIC arranged in the earphone jack, the electrostatic protection structure further comprises a third electrostatic protection trigger circuit 30, and the electrostatic protection trigger circuit 30 is serially connected with the microphone access pin MIC and is electrically connected between the sockets.
It is understood that the earphone 100 is a general component, and can be divided into a four-segment earphone 100 and a three-segment TRS earphone 100 according to the international standard citia standard, according to whether there is a microphone or not, where the four-segment earphone 100 (corresponding to the audio mother 10 from inside to outside) according to the international standard citia standard is a left channel, a right channel, a ground, and a microphone from top to bottom. The three-section TRS earphone 100 has a left sound channel, a right sound channel, and a ground in sequence from top to bottom (from inside to outside corresponding to the audio mother base 10). Of course, in some embodiments, the headset 100 may be configured as a ground, audio channel, right audio channel, or microphone from top to bottom.
Correspondingly, in the audio female jack 10, the audio female jack 10 is provided with an earphone jack (not shown), a ground pin GND, a left channel pin L, a right channel pin R, and a microphone access pin MIC which are provided in the earphone jack (the audio female jack 10 of the adapting three-section earphone 100 may not be provided with the pins). The microphone access pins MIC of the left channel pin L and the right channel pin R have elasticity, and when the earphone 100 is inserted into the earphone jack, the left channel pin L is pushed by the earphone 100; when the earphone 100 is pulled out from the earphone jack, the microphone connecting pins MIC of the left channel pin L and the right channel pin R have elastic recovery.
In some embodiments, a headphone socket detection pin (not shown) may be reserved on the audio socket 10 to detect plugging and unplugging of the headphone 100, for example, the headphone socket detection pin may be configured to be adjacent to the ground pin GND of the audio socket 10, and when the headphone 100 is plugged in, the metal shell of the headphone 100 may short-circuit the headphone socket detection pin with the ground pin GND. The output end of the earphone socket detection pin is electrically connected with the detection pin of the main controller 41 of the electronic device 200, and when the earphone 100 is detected to be inserted, the level of the detection pin of the main controller 41 is pulled low, so as to control the output of the audio signal interrupted by the speaker of the electronic device 200 and control the audio female socket 10 to output the audio signal. When it is detected that the earphone 100 is not inserted into or pulled out of the audio mother socket 10, the level of the detection pin of the main controller 41 is pulled high, thereby controlling the speaker to output an audio signal, and thus realizing the audio amplification.
In this embodiment, an esd trigger circuit 30 is disposed corresponding to each of the left channel pin L, the right channel pin R and the microphone access pin MIC, and the corresponding esd trigger circuit 30 can absorb an esd signal when the esd signal is generated on the left channel pin L, the right channel pin R and the microphone access pin MIC, and disconnect the electrical connection between the left channel pin L, the right channel pin R and the microphone access pin MIC in the audio socket 10 and the electrical connector 20. So that it is possible to prevent electrostatic interference signals from flowing into the earphone adapter or the electronic device 200 along the left channel pin L, the right channel pin R, or the microphone access pin MIC and the rear stage circuit module.
Referring to fig. 1 and 2, in an embodiment, each esd protection triggering circuit 30 includes a first electronic switch 31 and a first esd protection diode 32, a controlled terminal and a first input/output terminal of the first electronic switch 31 are interconnected with a cathode of the first esd protection diode 32 and the audio jack 10, and a second input/output terminal of the first electronic switch 31 is connected with the electrical connector 20; the anode of the first esd protection diode 32 is grounded;
the first esd protection diode 32 is configured to absorb and clamp the esd interference signal, and trigger the first electronic switch 31 to disconnect the electrical connection between the audio socket 10 and the electrical connector 20.
In this embodiment, the first ESD protection diodes 32 may be implemented by electrostatic diodes ESD or transient suppression diodes, and the number of the first ESD protection diodes may be set to three, and the three first ESD protection diodes are respectively connected to the left channel pin L, the right channel pin R, or the microphone access pin MIC. The number of the first electronic switches 31 may be set to
The first esd protection diode 32 is configured to absorb an electrostatic interference signal when the electrostatic interference signal is generated on the left channel pin L, the right channel pin R, or the microphone connection pin MIC, and clamp the electrostatic interference signal, for example, the voltage of the controlled terminal of the first electronic switch 31 may be clamped at 3.3V or 5V, so as to prevent the electrostatic interference signal output to the first electronic switch 31 from being damaged due to an excessive voltage. The first electronic switch 31 may be a transistor, a MOS transistor, or an analog switch, and in this embodiment, the first electronic switch 31 is in an open state when the audio jack is in normal operation, and when an electrostatic interference signal is generated on the left channel pin L, the right channel pin R, or the microphone connection pin MIC, the left channel pin L, the right channel pin R, and the microphone connection pin MIC in the audio mother socket 10 are electrically connected to the electrical connector 20 based on the triggering of the electrostatic interference signal.
In the above embodiment, the first electronic switch 31 may be set to be turned on at a low level and turned off at a high level, that is, when the electronic device 200 is operated to output an audio signal or a microphone of the earphone 100 inputs a voice signal, a level of the controlled terminal of the first electronic switch 31 is at a low level to turn on the first electronic switch 31, and when an electromagnetic interference signal at a high level is output to the controlled terminal of the first electronic switch 31, the first electronic switch 31 is turned off to disconnect the electrical connection between the left channel pin L, the right channel pin R, and the microphone connecting pin MIC in the audio mother socket 10 and the electrical connector 20.
Referring to fig. 1 and 2, in an embodiment, each esd protection triggering circuit 30 includes a unidirectional conductive element (not shown) disposed in series between the audio socket 10 and the electrical connector 20.
In this embodiment, the unidirectional conducting element may be implemented by a diode, an optocoupler, or other unidirectional conducting elements, and certainly in other embodiments, the electrostatic protection trigger circuit 30 may further include a first electrostatic protection diode 32 and an analog switch, and a person skilled in the art may arrange and connect the circuit elements according to the circuit setting when the electrostatic protection trigger circuit 30 is specifically set in practical application.
Referring to fig. 1 and fig. 2, in an embodiment, the esd protection structure further includes an audio signal processing circuit 40, a first input/output terminal of the audio signal processing circuit 40 is connected to a second input/output terminal of the esd protection trigger circuit 30, and a second input/output terminal of the audio signal processing circuit 40 is connected to the electrical connector 20.
In this embodiment, the audio signal processing circuit 40 may process the digital audio signal received by the electrical connector 20 to convert the digital audio signal into an analog audio signal, decode the analog audio signal, and output the decoded signal to the earphone jack through the electrostatic protection triggering circuit 30, thereby implementing transmission of the audio signal. Or, when the microphone in the earphone 100 receives the voice signal and outputs the voice signal to the earphone jack, the voice signal is output to the audio signal processing circuit 40 through the electrostatic protection triggering circuit 30, and the audio signal processing circuit 40 may perform signal coding and data processing on the analog voice signal and output the analog voice signal to the electrical connector 20, thereby implementing transmission of the voice signal.
Referring to fig. 1 and 2, in an embodiment, the audio signal processing circuit 40 includes a main controller 41 and a codec 42, an input/output end of the main controller 41 is a first input/output end of the audio signal processing circuit 40, the main controller 41 is further connected to the codec 42, and an input/output end of the codec 42 is a second input/output end of the audio signal processing circuit 40.
In this embodiment, the main controller 41 may be implemented by a microprocessor such as a single chip or a DSP, and the Codec 42 may be implemented by an integrated circuit Codec that combines analog-to-digital conversion (analog-to-digital conversion) and digital-to-analog conversion (digital-to-analog conversion) functions. The digital audio data is processed by the main controller 41 to be converted into an audio signal, and then the audio signal is decoded by the codec 42 and outputted to the earphone jack through the esd protection triggering circuit 30. The voice signal inputted by the earphone 100 is outputted to the transcoder through the esd protection triggering circuit 30, and the analog voice signal can be processed to be converted into a digital voice signal, and after the signal processing is performed by the main controller 41, the digital voice signal is converted into voice data to be outputted to the electronic device 200 through the electrical connector 20.
The invention also provides an earphone adapter, which comprises the electrostatic protection structure. The detailed structure of the electrostatic protection structure can refer to the above embodiments, and is not described herein again; it can be understood that, because the earphone adapter of the present invention employs the above-mentioned electrostatic protection structure, the embodiment of the earphone adapter of the present invention includes all technical solutions of all embodiments of the above-mentioned electrostatic protection structure, and the achieved technical effects are also completely the same, and are not described herein again.
In this embodiment, the earphone adapter can include the female seat of cable main part, USB-type C interface and audio frequency, and the one end of cable main part sets up connects USB-type C interface, the female seat of audio frequency is connected to the other end of cable main part, and USB-type C interface is used for connecting electronic equipment such as cell-phone, panel computer, MP3, MP 4. Through the earphone connector, the electric connection between the electronic equipment provided with the USB-type C interface and the traditional earphone can be realized.
The invention also provides electronic equipment which comprises an audio input/output interface and the electrostatic protection structure, wherein the audio input/output interface is connected with the electrostatic protection structure.
The detailed structure of the electrostatic protection structure can refer to the above embodiments, and is not described herein again; it can be understood that, because the above-mentioned electrostatic protection structure is used in the electronic device of the present invention, the embodiment of the electronic device of the present invention includes all technical solutions of all embodiments of the above-mentioned electrostatic protection structure, and the achieved technical effects are also completely the same, and are not described herein again.
In this embodiment, the electronic device may be a mobile phone, a computer, a tablet computer, or the like, and the electronic device is further provided with an audio module, and the audio module is connected to the electrostatic protection structure through an audio input/output interface to output an audio signal to the earphone through the electrostatic protection structure.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. An electrostatic protection structure, applied to connect an audio input/output interface of an electronic device and an earphone, comprising:
the audio female seat is configured to be plugged with the earphone, and comprises an earphone jack, a left sound channel pin and a right sound channel pin, wherein the left sound channel pin and the right sound channel pin are arranged in the earphone jack;
an electrical connector configured to connect with an audio input/output interface of the electronic device;
the electrostatic protection trigger circuit is arranged between the audio female seat and the electric connector in series; the number of the electrostatic protection trigger circuits corresponds to the number of the left sound channel pins and the number of the right sound channel pins, and the electrostatic protection trigger circuits are respectively a first electrostatic protection trigger circuit and a second electrostatic protection trigger circuit, and the first electrostatic protection trigger circuit and the second electrostatic protection trigger circuit are connected with the left sound channel pins and the right sound channel pins in a one-to-one correspondence manner;
each electrostatic protection trigger circuit comprises a first electronic switch and a first electrostatic protection diode, a controlled end and a first input/output end of the first electronic switch are interconnected with a cathode of the first electrostatic protection diode and the audio female seat, and a second input/output end of the first electronic switch is connected with the electric connector; the anode of the first electrostatic protection diode is grounded;
the first electrostatic protection diode is configured to absorb and clamp the electrostatic interference signal when the audio mother seat has the electrostatic interference signal input, and trigger the first electronic switch to disconnect the electrical connection between the audio mother seat and the electrical connector.
2. The electrostatic protection structure of claim 1, wherein the audio jack further comprises a microphone pin disposed within the headphone jack, the electrostatic protection structure further comprising a third electrostatic protection triggering circuit disposed in series between the microphone pin and the electrical connector.
3. The ESD structure of claim 1, wherein each ESD trigger circuit comprises a one-way conducting element, and the one-way conducting element is serially connected between the audio jack and the electrical connector.
4. The esd-protection structure of claim 1, further comprising an audio signal processing circuit, wherein a first input/output terminal of the audio signal processing circuit is connected to the earphone jack, and a second input/output terminal of the audio signal processing circuit is connected to the electrical connector.
5. The ESD structure of claim 4, wherein the audio signal processing circuit comprises a main controller and a codec, the input/output terminal of the main controller is a first input/output terminal of the audio signal processing circuit, the main controller is further connected to the codec, and the input/output terminal of the codec is a second input/output terminal of the audio signal processing circuit.
6. The electrostatic protection structure according to any one of claims 1 to 5, wherein the electrical connector is a USB-type C interface; or, the electric connector is an I2C communication interface;
the audio female seat is a 3.5mm audio female seat.
7. An adaptor for earphones, comprising an electrostatic protection arrangement as claimed in any one of claims 1 to 6.
8. An electronic device, comprising an audio input/output interface and the electrostatic protection structure according to any one of claims 1 to 6, wherein the audio input/output interface is connected to the electrostatic protection structure.
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| CN201811413492.1A CN109348344B (en) | 2018-11-23 | 2018-11-23 | Electrostatic protection structure, earphone adapter and electronic equipment |
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| CN201811413492.1A CN109348344B (en) | 2018-11-23 | 2018-11-23 | Electrostatic protection structure, earphone adapter and electronic equipment |
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| CN109348344B true CN109348344B (en) | 2020-05-22 |
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| CN110198503B (en) * | 2019-04-25 | 2021-08-13 | 华为技术有限公司 | Wireless earphone |
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| CN109348344A (en) | 2019-02-15 |
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