CN112566001A - Earphone detection circuit and terminal equipment - Google Patents
Earphone detection circuit and terminal equipment Download PDFInfo
- Publication number
- CN112566001A CN112566001A CN202011413168.7A CN202011413168A CN112566001A CN 112566001 A CN112566001 A CN 112566001A CN 202011413168 A CN202011413168 A CN 202011413168A CN 112566001 A CN112566001 A CN 112566001A
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- triode
- earphone
- resistor
- driving circuit
- circuit
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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
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/04—Diagnosis, testing or measuring for television systems or their details for receivers
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- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Signal Processing (AREA)
- Biomedical Technology (AREA)
- Multimedia (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention provides an earphone detection circuit and terminal equipment, wherein the detection circuit is connected between a detection pin of an earphone terminal and an earphone detection pin of a main control chip and comprises a triode primary drive circuit, a triode secondary drive circuit and a TVS (transient voltage suppressor); one end of the triode primary driving circuit is connected with a detection pin of an earphone terminal, and the other end of the triode primary driving circuit is connected with the triode secondary driving circuit in series and then is connected to an earphone detection pin of a main control chip; the TVS tube is connected between one end of the triode primary driving circuit and the ground. The earphone detection circuit and the terminal equipment have an electrostatic protection function, can effectively prevent the earphone detection pin of the television from being broken down by static electricity, and improve the static electricity test passing rate of the television.
Description
Technical Field
The invention relates to the technical field of static testing of earphones, in particular to an earphone detection circuit and terminal equipment.
Background
At present, terminal equipment such as a television and the like are required to be subjected to static electricity testing. When the television is subjected to static test, the earphone detection pin of the main control chip is often damaged due to the lack of a protection circuit, so that the problem that the earphone has no sound output or the main control chip is damaged is caused. When the earphone port CON1 performs the electrostatic air discharge test, the energy of the electrostatic is transmitted from the earphone detection pin (pin 6) of the earphone port CON1 to the earphone detection pin of the main control chip U1, which causes the detection pin of the main control chip U1 to be damaged, thereby causing the abnormality of the television.
Disclosure of Invention
The invention aims to provide an earphone detection circuit and terminal equipment, which can solve the problem that a detection pin of an earphone or a main control chip is damaged when a television is subjected to static test in the prior art.
The purpose of the invention is realized by the following technical scheme:
in a first aspect, the present invention provides an earphone detection circuit, connected between a detection pin of an earphone terminal and an earphone detection pin of a main control chip, comprising a triode primary drive circuit, a triode secondary drive circuit and a TVS tube; one end of the triode primary driving circuit is connected with a detection pin of an earphone terminal, and the other end of the triode primary driving circuit is connected with the triode secondary driving circuit in series and then is connected to an earphone detection pin of a main control chip; the TVS tube is connected between one end of the triode primary driving circuit and the ground.
Furthermore, the triode primary driving circuit and the triode secondary driving circuit are powered by 3.3V voltage.
Furthermore, the triode primary driving circuit comprises a resistor R1, a resistor R2 and a triode Q1; one end of the resistor R1 is connected with one end of the resistor R2 and is used as one end of a triode primary driving circuit; the other end of the resistor R2 is connected to the base of the triode Q1; the power supply voltage is input to the other end of the resistor R1; the emitter of the triode Q1 is grounded, and the collector of the triode Q1 is used as the other end of the triode primary driving circuit and is connected to the triode secondary driving circuit.
Further, the triode two-stage driving circuit comprises a resistor R3, a resistor R4 and a triode Q2; one end of the resistor R3 is connected with one end of the resistor R4 and is connected with a triode primary driving circuit, and the other end of the resistor R4 is connected with the base electrode of the triode Q2; the power supply voltage is input to the other end of the resistor R3; the emitter of the triode Q2 is grounded, and the collector of the triode Q2 is connected to the earphone detection pin of the main control chip.
Furthermore, after the earphone terminal is plugged into the earphone, the triode primary driving circuit is cut off, the triode secondary driving circuit is conducted, the earphone detection pin of the main control chip is at a low level, and a sound signal is output.
Furthermore, after the earphone connected with the earphone terminal is pulled out, the triode primary driving circuit is conducted, the triode secondary driving circuit is cut off, the earphone detection pin of the main control chip is at a high level, and the sound signal is turned off.
Further, when the air static test is performed on the earphone terminal, the static voltage is discharged from the detection pin of the earphone terminal to the ground through the TVS tube D1, transmitted to the base of the transistor Q2 through the resistor R2, and discharged to the supply voltage through the resistor R1.
In a second aspect, the present invention provides a terminal device, which includes the above earphone detection circuit.
The earphone detection circuit and the terminal equipment have an electrostatic protection function, can effectively prevent the earphone detection pin of the television from being broken down by static electricity, and improve the static electricity test passing rate of the television.
Drawings
Fig. 1 is a circuit schematic diagram of the headphone detection circuit of the present invention.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The earphone detection circuit of the present invention is connected between the detection pin 6 of the earphone terminal CON1 and the earphone detection pin of the main control chip U1. The circuit schematic diagram is shown in fig. 1, and the earphone detection circuit comprises a triode primary driving circuit, a triode secondary driving circuit and a TVS (transient voltage suppressor) tube D1, wherein one end of the triode primary driving circuit is connected with a detection pin 6 of an earphone terminal, and the other end of the triode primary driving circuit is connected with the triode secondary driving circuit in series and then is connected to an earphone detection pin of a main control chip U1. The TVS tube D1 is connected between one end of the triode primary driving circuit and the ground. The triode primary driving circuit and the triode secondary driving circuit are powered by 3.3V voltage.
When the air static test is performed on the earphone terminal CON1, the static energy is momentarily discharged to the ground through the TVS tube D1 and to the ground and 3.3V voltage through the triode primary driving circuit by the earphone detection pin 6 of the earphone terminal CON 1. The current is not directly discharged to the diode detection pin of the main control chip U1, so that the main control chip U1 is protected from being broken down by static electricity, and the purpose of protecting the main control chip is achieved.
Further, in a preferred embodiment of the present application, the transistor primary driving circuit includes a resistor R1, a resistor R2, and a transistor Q1. One end of the resistor R1 is connected to one end of the resistor R2 and serves as one end of the first-order driving circuit of the triode, and is connected to the pin 6 of the detection pin of the earphone terminal CON1, and the other end of the resistor R2 is connected to the base of the triode Q1. The 3.3V supply voltage is input to the other end of the resistor R1. The emitter of the transistor Q1 is grounded, and the collector of the transistor Q1 is connected to the second-stage driving circuit as the other end of the first-stage driving circuit.
Further, in a preferred embodiment of the present application, the transistor two-stage driving circuit includes a resistor R3, a resistor R4, and a transistor Q2. One end of the resistor R3 is connected with one end of the resistor R4 and is connected with the other end of the triode primary driving circuit, and the other end of the resistor R4 is connected with the base electrode of the triode Q2. The 3.3V supply voltage is input to the other end of the resistor R3. The emitter of the transistor Q2 is grounded, and the collector of the transistor Q2 is connected to the earphone detection pin of the master control chip U1.
The working principle of the earphone detection circuit is as follows: after the earphone terminal CON1 is plugged into the earphone, the 6 th pin of the detection pin is connected to the 7 th pin of CON1 and connected to ground GND, and the 6 th pin of the detection pin of the earphone terminal CON1 is at low level. The base voltage of transistor Q1 is low and transistor Q1 is off. The collector of transistor Q2 has a high level of 3.3V supplied through resistor R3, which drives the base of transistor Q2 through resistor R4, turning on transistor Q2. Triode Q2 switches on the back, connects ground with the voltage of main control chip U1's earphone detection pin, and main control chip detects the earphone and detects that the earphone detects the pin and be the low level, and earphone output signal realizes the effect of earphone sound output this moment. The output test function of the earphone is realized.
After the earphone terminal CON1 is unplugged, the 3.3V voltage drives the base of the transistor Q1 through the resistor R1 and the resistor R2, the transistor Q1 is turned on, and the voltage of the collector of the transistor Q1 is grounded. At this time, the base of the transistor Q2 is low, and the transistor Q2 is turned off. The earphone detection pin of the main control chip U1 is at a high level, and the earphone signal output is turned off after the main control chip U1 detects that the earphone detection pin voltage is at the high level. And the switching-off output signal test of the earphone is realized.
After the earphone is pulled out, when the air static electricity test is carried out on the earphone terminal CON1, the static electricity energy is instantly discharged to the ground through the TVS tube D1 by the earphone detection 6 pin of the earphone terminal CON1 and the base electrode of the triode Q1 through the resistor R2, 3.3V is discharged through the resistor R1, the diode detection pin of the main control chip U1 is not directly discharged, so that the main control chip U1 is protected from being broken down by static electricity, and the purpose of protecting the main control chip is achieved.
In the present invention, unless otherwise expressly stated or limited, the first feature may be "on" the second feature in direct contact with the second feature, or the first and second features may be in indirect contact via an intermediate. "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The above description is for the purpose of illustrating embodiments of the invention and is not intended to limit the invention, and it will be apparent to those skilled in the art that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the invention shall fall within the protection scope of the invention.
Claims (8)
1. The earphone detection circuit is characterized in that the earphone detection circuit is connected between a detection pin of an earphone terminal and an earphone detection pin of a main control chip and comprises a triode primary drive circuit, a triode secondary drive circuit and a TVS (transient voltage suppressor) tube; one end of the triode primary driving circuit is connected with a detection pin of an earphone terminal, and the other end of the triode primary driving circuit is connected with the triode secondary driving circuit in series and then is connected to an earphone detection pin of a main control chip; the TVS tube is connected between one end of the triode primary driving circuit and the ground.
2. The headset detection circuit of claim 1, wherein the transistor primary driver circuit and the transistor secondary driver circuit are powered by a 3.3V voltage.
3. The headset detecting circuit of claim 2, wherein the transistor primary driving circuit comprises a resistor R1, a resistor R2, and a transistor Q1; one end of the resistor R1 is connected with one end of the resistor R2 and is used as one end of a triode primary driving circuit; the other end of the resistor R2 is connected to the base of the triode Q1; the power supply voltage is input to the other end of the resistor R1; the emitter of the triode Q1 is grounded, and the collector of the triode Q1 is used as the other end of the triode primary driving circuit and is connected to the triode secondary driving circuit.
4. The headset detection circuit of claim 2, wherein the transistor two-stage driving circuit comprises a resistor R3, a resistor R4, and a transistor Q2; one end of the resistor R3 is connected with one end of the resistor R4 and is connected with a triode primary driving circuit, and the other end of the resistor R4 is connected with the base electrode of the triode Q2; the power supply voltage is input to the other end of the resistor R3; the emitter of the triode Q2 is grounded, and the collector of the triode Q2 is connected to the earphone detection pin of the main control chip.
5. The earphone detection circuit according to claim 1, wherein when an earphone is plugged into the earphone terminal, the triode primary driving circuit is turned off, the triode secondary driving circuit is turned on, and the earphone detection pin of the main control chip is at a low level to output a sound signal.
6. The earphone detection circuit according to claim 1, wherein when the earphone connected to the earphone terminal is unplugged, the first-stage driving circuit of the triode is turned on, the second-stage driving circuit of the triode is turned off, the earphone detection pin of the main control chip is at a high level, and the sound signal is turned off.
7. The earphone detection circuit of claim 3, wherein when performing the air static test on the earphone terminal, the static voltage is discharged from the detection pin of the earphone terminal to ground through the TVS tube D1, transmitted to the base of the transistor Q2 through the resistor R2, and discharged to the supply voltage through the resistor R1.
8. A terminal device, characterized in that it comprises an earphone detection circuit according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011413168.7A CN112566001A (en) | 2020-12-04 | 2020-12-04 | Earphone detection circuit and terminal equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011413168.7A CN112566001A (en) | 2020-12-04 | 2020-12-04 | Earphone detection circuit and terminal equipment |
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| Publication Number | Publication Date |
|---|---|
| CN112566001A true CN112566001A (en) | 2021-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011413168.7A Pending CN112566001A (en) | 2020-12-04 | 2020-12-04 | Earphone detection circuit and terminal equipment |
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| CN (1) | CN112566001A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113692099A (en) * | 2021-07-15 | 2021-11-23 | 中国电子科技集团公司第二十九研究所 | General IO protection tool |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201270580Y (en) * | 2008-10-23 | 2009-07-08 | 青岛海信电器股份有限公司 | Earphone mute circuit and television set with the same |
| CN205124127U (en) * | 2015-08-24 | 2016-03-30 | 广州视源电子科技股份有限公司 | Mainboard component structure |
| CN205812480U (en) * | 2016-05-27 | 2016-12-14 | 北京小鸟看看科技有限公司 | A kind of static release circuit |
| US20170150283A1 (en) * | 2015-06-04 | 2017-05-25 | Cirrus Logic International Semiconductor Ltd. | Audio connector and circuitry |
| CN107885480A (en) * | 2017-10-12 | 2018-04-06 | Tcl通力电子（惠州）有限公司 | Interface detects circuit and audio frequency apparatus |
-
2020
- 2020-12-04 CN CN202011413168.7A patent/CN112566001A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201270580Y (en) * | 2008-10-23 | 2009-07-08 | 青岛海信电器股份有限公司 | Earphone mute circuit and television set with the same |
| US20170150283A1 (en) * | 2015-06-04 | 2017-05-25 | Cirrus Logic International Semiconductor Ltd. | Audio connector and circuitry |
| CN205124127U (en) * | 2015-08-24 | 2016-03-30 | 广州视源电子科技股份有限公司 | Mainboard component structure |
| CN205812480U (en) * | 2016-05-27 | 2016-12-14 | 北京小鸟看看科技有限公司 | A kind of static release circuit |
| CN107885480A (en) * | 2017-10-12 | 2018-04-06 | Tcl通力电子（惠州）有限公司 | Interface detects circuit and audio frequency apparatus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113692099A (en) * | 2021-07-15 | 2021-11-23 | 中国电子科技集团公司第二十九研究所 | General IO protection tool |
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| CB02 | Change of applicant information |
Address after: Room 238, room 406, No.1, Yichuang street, Huangpu District, Guangzhou, Guangdong 510000 Applicant after: Guangzhou langguo Electronic Technology Co.,Ltd. Address before: Room 238, room 406, No.1, Yichuang street, Huangpu District, Guangzhou, Guangdong 510000 Applicant before: GUANGZHOU LANGO ELECTRONIC SCIENCE & TECHNOLOGY Co.,Ltd. |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210326 |
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| RJ01 | Rejection of invention patent application after publication |