CN206413166U - A kind of earphone output mute circuit - Google Patents
A kind of earphone output mute circuit Download PDFInfo
- Publication number
- CN206413166U CN206413166U CN201621481465.4U CN201621481465U CN206413166U CN 206413166 U CN206413166 U CN 206413166U CN 201621481465 U CN201621481465 U CN 201621481465U CN 206413166 U CN206413166 U CN 206413166U
- Authority
- CN
- China
- Prior art keywords
- triode
- output
- switching element
- power supply
- earphone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000004065 semiconductor Substances 0.000 claims description 28
- 230000002159 abnormal effect Effects 0.000 abstract description 8
- 230000005611 electricity Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Abstract
The utility model is related to the earphone output circuit field of flat panel TV, discloses a kind of earphone output mute circuit, including earphone output unit and main control chip, and the earphone output mute circuit also includes：Turn-on muting module and Jing Yin module of shutting down；The turn-on muting module includes output switching element and the backlight control unit being connected with the output switching element；The output end of the output switching element is also connected with the input of earphone output unit and the pin of main control chip respectively；The Jing Yin module of shutdown includes shutdown control unit and the shutdown switch element being connected with the shutdown control unit；Input of the shutdown switch element also with the output switching element is connected.The utility model is a kind of earphone output mute circuit, provided with turn-on muting module and Jing Yin module of shutting down, can be effectively shielded from the noise ripple started shooting and produced when shutting down, can't hear the abnormal sound produced by the noise ripple, lift the usage experience of flat panel TV.
Description
Technical field
The utility model is related to the earphone output circuit field of flat panel TV, more particularly to a kind of earphone output mute electricity
Road.
Background technology
What the main control chip of flat panel TV at this stage was typically used is all the form of single-chip, and headset output interface is direct
From the headphone unit circuit output of main control chip, earphone accessory power outlet is connected to by coupled capacitor.
When establishing machine by cable on flat panel TV, each road voltage is added on the unit circuit inside main control chip, then soft
Part system carries out hardware initialization action, the wink initialized herein to the earphone output unit control circuit inside main control chip
Between, the earphone output unit control circuit pin of main control chip can export the noise ripple of a short time.
During shutdown, fall under the voltage instantaneous on the unit circuit of main control chip so that earphone output unit control electricity
Road has little time to do Jing Yin action, and earphone output unit control circuit pin exports the noise of a short time when also can be as start
Ripple, exactly because the noise ripple of this short time so as to cause earphone " " a sound abnormal sound.This noise ripple is in main control chip
Portion can not be eliminated, can only be in outside elimination, or avoid this noise ripple.
At present, general way is to go to eliminate this noise ripple using the special chip of TI companies, but cost is higher；Or
This abnormal sound is not processed, but can so reduce the user experience of flat panel TV.
Utility model content
The purpose of this utility model is to overcome weak point of the prior art there is provided a kind of earphone output mute circuit.
The purpose of this utility model is achieved through the following technical solutions：
A kind of earphone output mute circuit, including earphone output unit and main control chip, the earphone output mute circuit
Also include：Turn-on muting module and Jing Yin module of shutting down；
The turn-on muting module includes output switching element and the backlight control list being connected with the output switching element
Member；The output end of the output switching element is also connected with the input of earphone output unit and the pin of main control chip respectively；
The Jing Yin module of shutdown includes shutdown control unit and switched with the shutdown that the shutdown control unit is connected single
Member；Input of the shutdown switch element also with the output switching element is connected；
When the output switching element receives starting-up signal, start init state, when the output switching element
After the control signal for receiving the backlight control unit, the output switching element conducting is controlled, the main control chip is realized
Normally it is connected with the earphone output unit, exportable sound；
After the shutdown control unit receives off signal, the control conducting shutdown switch element, and then control
The output switching element shut-off, the main control chip can not be connected with the earphone output unit, it is impossible to export sound.
As further preferred scheme, the backlight control unit includes the 4th triode, the 5th resistance, the first power supply
Power supply and backlight signal control end；
The backlight signal control end is connected through the 5th resistance with the base stage of the 4th triode, and the described 4th 3
The colelctor electrode of pole pipe is connected with the input and first power supply of the output switching element respectively, the four or three pole
The grounded emitter of pipe；
3rd resistor is in series between the colelctor electrode and first power supply of 4th triode.
As further preferred scheme, the output switching element includes the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the three or three pole
Pipe, second resistance and the second power supply；
First power supply is also connected through the 3rd resistor with the base stage of the 3rd triode, the base of the 3rd triode
Pole is also as the input of the output switching element；
The colelctor electrode of 3rd triode connects with the G poles of first metal-oxide-semiconductor and the G poles of second metal-oxide-semiconductor respectively
Connect, the colelctor electrode of the 3rd triode is also connected by the second resistance with second power supply, the described 3rd 3
The grounded emitter of pole pipe；
The S poles of first metal-oxide-semiconductor are connected with a pin of the main control chip, D poles and the first of earphone output unit
Input is connected；
The S poles of second metal-oxide-semiconductor are connected with another pin of the main control chip, and the of D poles and earphone output unit
Two inputs are connected.
As further preferred scheme, the shutdown control unit includes the second power supply, the first diode, the 8th
Resistance and the 3rd electric capacity；
Second power supply is connected with the anode of first diode, and the negative electrode of first diode is through described
It is grounded after 8th resistance, the 3rd electric capacity is connected with the 8th resistor coupled in parallel；One end of 3rd electric capacity also with it is described
The input connection of shutdown switch element.
As further preferred scheme, the shutdown switch element includes the 5th triode, the 6th resistance, the 7th resistance
And second diode；
Second power supply is connected through the 6th resistance with the base stage of the 5th triode；Five or three pole
The emitter stage of pipe as it is described shutdown switch element input, colelctor electrode through second diode, the 7th resistance with it is described
The input connection of output switching element.
As further preferred scheme, first power supply is+5V standby powers.
As further preferred scheme, second power supply is+12V normality power supplys.
The utility model compared to prior art advantage and have the beneficial effect that：
1st, the utility model is a kind of earphone output mute circuit, can provided with turn-on muting module and Jing Yin module of shutting down
With the noise ripple for being effectively shielded from starting shooting and producing when shutting down, the abnormal sound produced by the noise ripple is can't hear, flat panel TV is lifted
Usage experience.
2nd, earphone output mute circuit of the present utility model uses simplest circuit, realizes and eliminates flat panel TV in switch
Impact noise during machine, and cost is low, dependable performance the characteristics of.
3rd, circuit of the present utility model is easy and effective, implements very easy, can on a large scale promote the use of, have
Larger commercial value.
Brief description of the drawings
Fig. 1 is the theory diagram of the earphone output mute circuit of the utility model embodiment；
Fig. 2 is the circuit diagram of the earphone output mute circuit of the utility model embodiment；
Fig. 3 is the timing diagram of four road signals in the course of work in embodiment.
Embodiment
For the ease of understanding the utility model, the utility model is more fully retouched below with reference to relevant drawings
State.Better embodiment of the present utility model is given in accompanying drawing.But, the utility model can come in many different forms
Realize, however it is not limited to embodiments described herein.On the contrary, the purpose for providing these embodiments is to make to this practicality newly
It is more thorough comprehensive that the disclosure of type understands.
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element
Or can also have element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " level ", " left side ",
For illustrative purposes only, it is unique embodiment to be not offered as " right side " and similar statement.
Unless otherwise defined, all of technologies and scientific terms used here by the article is led with belonging to technology of the present utility model
The implication that the technical staff in domain is generally understood that is identical.It is herein to be in term used in the description of the present utility model
The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term as used herein " and/or " bag
Include the arbitrary and all combination of one or more related Listed Items.
Referring to Fig. 1, a kind of earphone output mute circuit 10, including earphone output unit 1 and main control chip 2, the ear
Machine output mute circuit 10 also includes：Turn-on muting module 3 and Jing Yin module 4 of shutting down.The turn-on muting module 3 is used to eliminate
In television startup earphone interface produce " " abnormal sound.The Jing Yin module 4 of shutdown is used to eliminate the earphone in television shutdown
Interface produce produce " " abnormal sound.
The turn-on muting module 3 includes output switching element 31 and the backlight control being connected with the output switching element 31
Unit 32 processed；The output end of the output switching element 31 also respectively with the input of earphone output unit 1 and main control chip 2
Pin is connected.
The Jing Yin module 4 of shutdown includes shutdown control unit 41 and opened with the shutdown that the shutdown control unit 41 is connected
Close unit 42；Input of the shutdown switch element 42 also with the output switching element 31 is connected.
When the output switching element 31 receives starting-up signal, start init state, when the output switch list
Member 31 is received after the control signal of the backlight control unit 32, controls the output switching element 31 to turn on, and is realized described
Main control chip 2 is normally connected with the earphone output unit 1, exportable sound.
After the shutdown control unit 41 receives off signal, the control conducting shutdown switch element 42, and then
The output switching element 31 is controlled to turn off, the main control chip 2 can not be connected with the earphone output unit 1, it is impossible to be exported
Sound.
Refer to Fig. 2.The backlight control unit 31 includes the 4th triode Q4, the 5th resistance R5, the first power supply
And backlight signal control end.First power supply is+5V standby powers, in fig. 2 for+5V standby powers are designated as+5V_
Standby.It should also be noted that in fig. 2, backlight signal control end is BL_ON/OFF.
The backlight signal control end is connected through the 5th resistance R5 with the base stage of the 4th triode Q4, and described
Four triode Q4 colelctor electrode is connected with the input and first power supply of the output switching element 31 respectively, described
4th triode Q4 grounded emitter；It is in series between the colelctor electrode and first power supply of the 4th triode Q4
3rd resistor R3.
It should also be noted that the output switching element includes the first metal-oxide-semiconductor Q1, the second metal-oxide-semiconductor Q2, the 3rd triode
Q3, second resistance R2 and the second power supply.Second power supply is+12V normality power supplys, in fig. 2 ,+12V normalities electricity
Source is designated as+12V_Normal.
First power supply is also connected through the 3rd resistor R3 with the 3rd triode Q3 base stage, the 3rd triode
Q3 base stage is also as the input of the output switching element 31.
The colelctor electrode of the 3rd triode Q3 respectively with the G poles of the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2
The connection of G poles, the colelctor electrode of the 3rd triode Q3 are also connected by the second resistance R2 with second power supply, institute
State the 3rd triode Q3 grounded emitter；
The S poles of the first metal-oxide-semiconductor Q1 are connected with a pin of the main control chip 2, D poles and earphone output unit 1
First input end is connected.Specifically, the first input end of the earphone output unit 1 is OUT_L ends.Here main control chip 2
Pin is EARPHONE_OUT_L pins.
The S poles of the second metal-oxide-semiconductor Q2 are connected with another pin of the main control chip 2, D poles and earphone output unit 1
The second input connection.Specifically, the second input of the earphone output unit 1 is OUT_R ends.Here main control chip 2
Pin be EARPHONE_OUT_R pins.
It is noted that the shutdown control unit 41 includes the second power supply, the first diode D1, the 8th resistance R8
And the 3rd electric capacity C3.
Second power supply is connected with the anode of the first diode D1, the negative electrode warp of the first diode D1
It is grounded after the 8th resistance R8, the 3rd electric capacity C3 and the 8th resistance R8 is connected in parallel；The 3rd electric capacity C3's
Input of the one end also with the shutdown switch element 42 is connected.
It is noted that it is described shutdown switch element 42 include the 5th triode Q5, the 6th resistance R6, the 7th resistance R7 and
Second diode D2.
Second power supply is connected through the 6th resistance R6 with the base stage of the 5th triode Q5；Described 5th
Triode Q5 emitter stage is as the input of the shutdown switch element 42, and colelctor electrode is through the second diode D2, the 7th
Resistance R7 is connected with the input of the output switching element 31.
The course of work：
Establish machine on flat panel TV by cable, then+5V_Standby output voltages are waited after 50ms or so ,+12V_Normal is defeated
Go out voltage, now all normally, software systems start initialization to each road voltage of main control chip；The earphone output of main control chip is single
First circuit pin exports the noise ripple of a short time.Backlight signal control end is BL_ON/OFF, is in last output control letter
Number (timing diagram between them is as shown in Figure 3).After+5V_Standby output voltages, the 3rd triode Q3 conductings,
3rd triode Q3 colelctor electrode output low level, i.e. the first metal-oxide-semiconductor Q1 G poles, the second metal-oxide-semiconductor Q2 G poles is also low level,
First metal-oxide-semiconductor Q1, the second metal-oxide-semiconductor Q2 are not turned on, in cut-off state, EARPHONE_OUT_L and EARPHONE_OUT_R signals
In the state disconnected between earphone output unit, so can't hear from earphone interface " " abnormal sound.
After BL_ON/OFF output control signals, the 4th triode Q4 conductings, the 4th triode Q4 colelctor electrode output is low
Level, the 3rd triode Q3 be in cut-off state, the first metal-oxide-semiconductor Q1 G poles, the second metal-oxide-semiconductor Q2 G extremely on directly have one
12V voltages, the first metal-oxide-semiconductor Q1, the second metal-oxide-semiconductor Q2 conducting, EARPHONE_OUT_L and EARPHONE_OUT_R signals and earphone
State in connection between output unit, is that normal output sound is prepared.
When flat panel TV shuts down, BL_ON/OFF signals ,+5V_Standby ,+12V_Normal is initially located in electric discharge shape
State, when 12V_Normal tension discharges are to 10.6V, voltage is also 10.6V in the 5th triode Q5 base stage, due to the 3rd electricity
Hold and electricity is filled with C3, and it is very slow to discharge, and the voltage on the 3rd electric capacity C3 subtracts the first diode D1 forward voltage drops for 12V
It is 11.3V after 0.7V, and when voltage is 10.6V in the 5th triode Q5 base stage, the 5th triode Q5 is begun to turn on, second
Diode D2 is also while forward conduction, electric current makes the 3rd triode Q3 conductings, the first metal-oxide-semiconductor Q1, second by the 7th resistance R7
Metal-oxide-semiconductor Q2 G pin are low level, and in cut-off state, EARPHONE_OUT_L and EARPHONE_OUT_R signals and earphone are defeated
Go out in the state disconnected between unit, so can't hear from earphone interface " " abnormal sound.
Embodiment described above only expresses several embodiments of the present utility model, and it describes more specific and detailed
Carefully, but can not therefore and be interpreted as the limitation to the utility model the scope of the claims.It should be pointed out that for the general of this area
For logical technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these are all
Belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (7)
1. a kind of earphone output mute circuit, including earphone output unit and main control chip, it is characterised in that the earphone output
Mute circuit also includes：Turn-on muting module and Jing Yin module of shutting down；
The turn-on muting module includes output switching element and the backlight control unit being connected with the output switching element；Institute
The output end for stating output switching element is also connected with the input of earphone output unit and the pin of main control chip respectively；
The Jing Yin module of shutdown includes shutdown control unit and the shutdown switch element being connected with the shutdown control unit；Institute
Input of the shutdown switch element also with the output switching element is stated to be connected；
When the output switching element receives starting-up signal, start init state, when the output switching element is received
To after the control signal of the backlight control unit, the output switching element conducting is controlled, the main control chip and institute is realized
State earphone output unit normally to connect, exportable sound；
After the shutdown control unit receives off signal, the control conducting shutdown switch element, and then control described
Output switching element is turned off, and the main control chip can not be connected with the earphone output unit, it is impossible to export sound.
2. earphone output mute circuit according to claim 1, it is characterised in that the backlight control unit includes the 4th
Triode, the 5th resistance, the first power supply and backlight signal control end；
The backlight signal control end is connected through the 5th resistance with the base stage of the 4th triode, the 4th triode
Colelctor electrode be connected respectively with the input and first power supply of the output switching element, the 4th triode
Grounded emitter；
3rd resistor is in series between the colelctor electrode and first power supply of 4th triode.
3. earphone output mute circuit according to claim 2, it is characterised in that the output switching element includes first
Metal-oxide-semiconductor, the second metal-oxide-semiconductor, the 3rd triode, second resistance and the second power supply；
First power supply is also connected through the 3rd resistor with the base stage of the 3rd triode, and the base stage of the 3rd triode is also
It is used as the input of the output switching element；
The colelctor electrode of 3rd triode is connected with the G poles of first metal-oxide-semiconductor and the G poles of second metal-oxide-semiconductor respectively, institute
The colelctor electrode for stating the 3rd triode is also connected by the second resistance with second power supply, the 3rd triode
Grounded emitter；
The S poles of first metal-oxide-semiconductor are connected with a pin of the main control chip, D poles and the first input of earphone output unit
End connection；
The S poles of second metal-oxide-semiconductor are connected with another pin of the main control chip, and the second of D poles and earphone output unit is defeated
Enter end connection.
4. earphone output mute circuit according to claim 1, it is characterised in that the shutdown control unit includes second
Power supply, the first diode, the 8th resistance and the 3rd electric capacity；
Second power supply is connected with the anode of first diode, and the negative electrode of first diode is through the described 8th
It is grounded after resistance, the 3rd electric capacity is connected with the 8th resistor coupled in parallel；One end of 3rd electric capacity also with the shutdown
The input connection of switch element.
5. earphone output mute circuit according to claim 4, it is characterised in that the shutdown switch element includes the 5th
Triode, the 6th resistance, the 7th resistance and the second diode；
Second power supply is connected through the 6th resistance with the base stage of the 5th triode；5th triode
Emitter stage is as the input of the shutdown switch element, and colelctor electrode is through second diode, the 7th resistance and the output
The input connection of switch element.
6. the earphone output mute circuit according to Claims 2 or 3 any one, it is characterised in that first power supply
Power supply is+5V standby powers.
7. the earphone output mute circuit according to claim 3 to 5 any one, it is characterised in that second power supply
Power supply is+12V normality power supplys.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621481465.4U CN206413166U (en) | 2016-12-30 | 2016-12-30 | A kind of earphone output mute circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621481465.4U CN206413166U (en) | 2016-12-30 | 2016-12-30 | A kind of earphone output mute circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206413166U true CN206413166U (en) | 2017-08-15 |
Family
ID=59552955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621481465.4U Expired - Fee Related CN206413166U (en) | 2016-12-30 | 2016-12-30 | A kind of earphone output mute circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206413166U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110381409A (en) * | 2019-08-13 | 2019-10-25 | 京东方科技集团股份有限公司 | A kind of control panel of display, its driving method and display |
| CN110730399A (en) * | 2018-07-17 | 2020-01-24 | 青岛海信电器股份有限公司 | Display device earphone control circuit and display device |
-
2016
- 2016-12-30 CN CN201621481465.4U patent/CN206413166U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110730399A (en) * | 2018-07-17 | 2020-01-24 | 青岛海信电器股份有限公司 | Display device earphone control circuit and display device |
| CN110381409A (en) * | 2019-08-13 | 2019-10-25 | 京东方科技集团股份有限公司 | A kind of control panel of display, its driving method and display |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104868770B (en) | The control circuit of switching device | |
| CN106710531B (en) | Backlight control circuit and electronic device | |
| CN102332898B (en) | Switching circuit with zero standby power consumption | |
| CN203859558U (en) | Electronic equipment and external charging circuit thereof | |
| CN203313144U (en) | Backflow prevention circuit | |
| CN206413166U (en) | A kind of earphone output mute circuit | |
| CN106878872A (en) | A kind of peripheral circuit for eliminating noise signal | |
| CN205490115U (en) | Switch power supply circuit | |
| CN105958985A (en) | Digital power supply providing circuit and liquid crystal driver | |
| CN204290475U (en) | Power supply switch circuit and electronic equipment | |
| CN115793546A (en) | Low-power consumption MCU chip standby control circuit | |
| CN202353536U (en) | Time adjustable switching circuit | |
| CN207965806U (en) | System and electronic equipment are restarted in power supply | |
| CN209472380U (en) | Anti-reverse electromotive force circuit and unmanned plane | |
| CN209358740U (en) | A kind of bluetooth headset reset control circuit | |
| CN202159236U (en) | Standby switch circuit and miniature electronic device | |
| CN201369777Y (en) | On-off noise elimination circuit of LCD (liquid crystal display) TV | |
| CN206412930U (en) | A kind of reduction voltage circuit | |
| CN204009463U (en) | A kind of power on and power off muffling circuit | |
| CN107733413B (en) | Intelligent switch circuit and intelligent terminal of pre-installation battery system | |
| CN202183022U (en) | Forcible reliable circuit and electrical equipment | |
| CN206149391U (en) | Explodent elimination circuit | |
| CN209329961U (en) | A kind of power control circuit and electronic equipment | |
| CN204229341U (en) | Processor state conversion equipment and portable power source | |
| CN204290917U (en) | Hard triggering boot-strap circuit and electronic equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170815 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |