CN201369777Y - On-off noise elimination circuit of LCD (liquid crystal display) TV - Google Patents
On-off noise elimination circuit of LCD (liquid crystal display) TV Download PDFInfo
- Publication number
- CN201369777Y CN201369777Y CNU2009201364616U CN200920136461U CN201369777Y CN 201369777 Y CN201369777 Y CN 201369777Y CN U2009201364616 U CNU2009201364616 U CN U2009201364616U CN 200920136461 U CN200920136461 U CN 200920136461U CN 201369777 Y CN201369777 Y CN 201369777Y
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Abstract
The utility model relates to an LCD (liquid crystal display) TV, in particular to a noise elimination circuit in the LCD TV when in turning on and off. By utilizing the characteristic of time difference of power-on/off by system power supply and rear-stage power amplifier power supply, a high electrical level is instantly generated before a rear-stage power amplifier stops working, so as to control the rear-stage power amplifier, an earphone as well as AV-OUT (video output) and achieve the silencing effect, thereby eliminating noise of pop when in turning on and off a loudspeaker, the earphone and the AV-OUT.
Description
[technical field]
The utility model relates to LCD TV, the de-noising circuit when especially relating to switching on and shutting down in the LCD TV.
[background technology]
Tradition LCD TV loudspeaker, earphone, AV-OUT (video output) when the alternating-current switch machine can produce " puff, puff " noise.This is because LCD TV system when just powering on has little time work, the out-of-work cause of system during shutdown.Circuit of the prior art can't be eliminated loudspeaker, earphone, AV-OUT and produce " puff, puff " noise.
[summary of the invention]
Technical problem to be solved in the utility model is to provide a kind of switching on and shutting down de-noising circuit of LCD TV, " puff, puff " noise that loudspeaker, earphone, AV-OUT produce in the time of can eliminating switching on and shutting down.
The utility model solves the problems of the technologies described above by the following technical solutions:
The switching on and shutting down de-noising circuit of LCD TV, the C utmost point of triode Q8, Q4 are connected respectively on the left and right sound channels outlet line of earphone; The C utmost point of triode Q9, Q10 is connected respectively on the AV_OUT_R/L (audio/video outlet line); The B of triode Q8, Q4, Q9, Q10 extremely all is connected to the E utmost point of triode Q7; The B utmost point of triode Q7 connects the negative electrode of diode D5, and the anode of diode D5 is connected to the common port of resistance R 20 and R13, the other end ground connection of resistance R 20, and the other end of resistance R 13 is connected to the C utmost point of triode Q3; The C utmost point of triode Q7 is connected with the E utmost point of triode Q3; The B utmost point of triode Q7 connects the negative electrode of diode D8, and the anode of diode D8 connects the E utmost point of triode Q6; The C level of triode Q6 is connected to the C level of triode Q7; The E utmost point of triode Q3 connects the negative electrode of diode D2, and the anode of diode D2 connects 12V; The B utmost point of triode Q3 connects positive pole and the anode of diode D1 and an end of resistance R 3 of capacitor C 1, and the negative electrode of the other end of resistance R 3 and diode D1 all is connected to the 12V power supply;
The B utmost point of triode Q6 connects the negative electrode of diode D6, and the anode of diode D6 is connected to the common port of resistance R 23, R27, the other end ground connection of resistance R 27, and the other end of resistance R 23 is connected to the negative electrode of controllable silicon U1; The AMP_MUTE of back level power amplifier (back level power amplifier _ quiet) is connected to the C utmost point of triode Q2, and the B utmost point of triode Q2 is connected to resistance R 8, and the other end of resistance R 8 connects the C utmost point of triode Q1; The B utmost point of triode Q1 connects the negative electrode of diode D7, and the anode of diode D7 connects the C utmost point of triode Q5, the E utmost point ground connection of triode Q5, and the C utmost point of triode Q5 connects resistance R 22, and the other end of resistance R 22 connects the 5V power supply; The B utmost point of triode Q5 connects resistance R 26, and the other end of resistance R 26 connects MCU_MUTE_ (microprocessor is quiet) control; Back level power amplifier power supply connects resistance R 6, and the other end of resistance R 6 connects the negative electrode of controllable silicon U1, and the control utmost point of controllable silicon U1 connects resistance R 10, and the other end of resistance R 10 connects the 12V power supply.
Wherein triode Q3 is the positive-negative-positive triode; Triode Q1, Q2, Q4, Q5, Q6, Q7, Q8, Q9, Q10 are NPN type triodes.
The utility model utilizes system's power supply to power with back level power amplifier and powers on, the characteristics of power down time difference, and moment does not produce a high level and removes to control back level power amplifier, earphone, AV-OUT before back level power amplifier also quits work, and makes it quiet.
[description of drawings]
The utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the utility model circuit diagram.
Fig. 2 is (output _ quiet) control loop of earphone OUT_MUTE in the utility model and AVOUTMUTE (audio/video output is quiet) control loop.
[embodiment]
Please consult Fig. 1, shown in Figure 2 simultaneously, the C utmost point of triode Q8, Q4 is connected respectively on the left and right sound channels outlet line of earphone; The C utmost point of triode Q9, Q10 is connected respectively on the AV_OUT_R/L (audio/video outlet line); The B of triode Q8, Q4, Q9, Q10 extremely all is connected to the E utmost point of triode Q7; The B utmost point of triode Q7 connects the negative electrode of diode D52, and the anode of diode D52 is connected to the common port of resistance R 20 and R13, the other end ground connection of resistance R 20, and the other end of resistance R 13 is connected to the C utmost point of triode Q3; The C utmost point of triode Q7 is connected with the E utmost point of triode Q3; The B utmost point of triode Q7 connects the negative electrode of diode D51, and the anode of diode D51 connects the E utmost point of triode Q6; The C level of triode Q6 is connected to the C level of triode Q7; The E utmost point of triode Q3 connects the negative electrode of diode D2, and the anode of diode D2 connects 12V; The B utmost point of triode Q3 connects positive pole and the anode of diode D1 and an end of resistance R 3 of capacitor C 1, and the negative electrode of the other end of resistance R 3 and diode D1 all is connected to the 12V power supply.
The B utmost point of triode Q6 connects the negative electrode of diode D6, and the anode of diode D6 is connected to the common port of resistance R 23, R27, the other end ground connection of resistance R 27, and the other end of resistance R 23 is connected to the negative electrode of controllable silicon U1.
The AMP_MUTE of back level power amplifier (back level power amplifier _ quiet) is connected to the C utmost point of triode Q2, and the B utmost point of triode Q2 is connected to resistance R 8, and the other end of resistance R 8 connects the C utmost point of triode Q1; The B utmost point of triode Q1 connects the negative electrode of diode D7, and the anode of diode D7 connects the C utmost point of triode Q5, the E utmost point ground connection of triode Q5, and the C utmost point of triode Q5 connects resistance R 22, and the other end of resistance R 22 connects the 5V power supply; The B utmost point of triode Q5 connects resistance R 26, and the other end of resistance R 26 connects MCU_MUTE_ (microprocessor is quiet) control; Back level power amplifier power supply connects resistance R 6, and the other end of resistance R 6 connects the negative electrode of controllable silicon U1, and the control utmost point of controllable silicon U1 connects resistance R 10, and the other end of resistance R 10 connects the 12V power supply.
Wherein triode Q3 is the positive-negative-positive triode; Triode Q1, Q2, Q4, Q5, Q6, Q7, Q8, Q9, Q10 are NPN type triodes.
The utility model course of work is described below:
One, the quiet control loop of back level power amplifier
1) alternating current start, 12V and power amplifier power supply are risen simultaneously, and 12V is through the dividing potential drop of resistance R 10 with R9, when controllable silicon U1 controls voltage REF greater than 2.5V, controllable silicon U1 conducting, A point voltage are 0V, and the B pole tension of triode Q1 is low, triode Q1 ends, power amplifier power supply process resistance R 1 and R8 dividing potential drop are added to the B utmost point of triode Q2, and triode Q2B is very high, the Q2 conducting, AMP_MUTE (back level power amplifier is quiet) low-voltage, back level power amplifier output.MCU_MUTE_ behind system's normal boot-strap (microprocessor is quiet) control is made as high potential, be added to the triode Q5B utmost point through resistance R 26, triode Q5B is very high, triode Q5 conducting, 5V is added to the three extremely secret Q5C utmost points through resistance R 22, level power amplifier output after same AMP_MUTE (the back level power amplifier _ quiet) low-voltage.
2) alternating current shutdown, because 12V is faster than power amplifier power supply power down, when controllable silicon U1 control voltage REF less than 2.5V, U1 ends, the A point voltage be a height, the B pole tension of triode Q1 is high, the Q1 conducting, triode Q2B is very low, and Q2 ends, AMP_MUTE (back level power amplifier _ quiet) high voltage, back level power amplifier no-output.
Two, video output is exported quiet control with earphone
1) when alternating current powers on, system also there is not work, 12V postpones to open than 12_SB, and triode Q3E is greatly in the B utmost point, the Q3 conducting, 12V obtains 4.3V voltage through resistance R 13, R20 dividing potential drop again through the E-C utmost point of diode D2, triode Q3, and be added to the B utmost point of triode Q7 through diode D5, the Q7 conducting, the C point voltage is high, triode Q4, Q8, Q9, Q10 conducting simultaneously, AV OUT R/L (audio/video output) and earphone OUT R/L (output) are dragged down no-output.
2) after system's operate as normal, 12V opens, through 1 charging of 3 pairs of capacitor C of resistance R, the charging of 1 short time of capacitor C reaches capacity, and triode Q3B is very high, and Q3 ends, triode Q7 also ends, the C point voltage is low, and triode Q4, Q8, Q9, Q10 end simultaneously, and AVOUTR/L (audio/video output) and earphone OUT R/L (output) have output.
3) alternating current shutdown, because 12V is faster than power amplifier power supply power down, when U1 controls voltage REF less than 2.5V, controllable silicon U1 ends, the A point voltage is high, the A point voltage obtains a 8.2V high level through resistance R 23 and R27 dividing potential drop and is added to the triode Q6B utmost point through diode D6, triode Q8 conducting, 12V is through diode D2, the C-E utmost point of triode Q6 is added to the B utmost point of triode Q7 again through diode D8, triode Q7 conducting, the C point voltage is high, triode Q4, Q8, Q9, Q10 conducting simultaneously, AV OUTR/L (audio/video output) and earphone OUT R/L (output) are dragged down no-output.
The utility model utilizes system power supply and rear level power amplifier to power and powers on, the characteristics of power down time difference, Rear level power amplifier also do not quit work front moment produce a high level go to control rear level power amplifier, earphone, AV-OUT makes it quiet.
Claims (2)
1, the switching on and shutting down de-noising circuit of LCD TV is characterized in that:
The C utmost point of triode Q8, Q4 is connected respectively on the left and right sound channels outlet line of earphone; The C utmost point of triode Q9, Q10 is connected respectively on the audio/video outlet line; The B of triode Q8, Q4, Q9, Q10 extremely all is connected to the E utmost point of triode Q7; The B utmost point of triode Q7 connects the negative electrode of diode D5, and the anode of diode D5 is connected to the common port of resistance R 20 and R13, the other end ground connection of resistance R 20, and the other end of resistance R 13 is connected to the C utmost point of triode Q3; The C utmost point of triode Q7 is connected with the E utmost point of triode Q3; The B utmost point of triode Q7 connects the negative electrode of diode D8, and the anode of diode D8 connects the E utmost point of triode Q6; The C level of triode Q6 is connected to the C level of triode Q7; The E utmost point of triode Q3 connects the negative electrode of diode D2, and the anode of diode D2 connects the 12V power supply; The B utmost point of triode Q3 connects positive pole and the anode of diode D1 and an end of resistance R 3 of capacitor C 1, and the negative electrode of the other end of resistance R 3 and diode D1 all is connected to the 12V power supply;
The B utmost point of triode Q6 connects the negative electrode of diode D6, and the anode of diode D6 is connected to the common port of resistance R 23, R27, the other end ground connection of resistance R 27, and the other end of resistance R 23 is connected to the negative electrode of controllable silicon U1; The quiet C utmost point that is operatively connected to triode Q2 of back level power amplifier, the B utmost point of triode Q2 is connected to resistance R 8, and the other end of resistance R 8 connects the C utmost point of triode Q1; The B utmost point of triode Q1 connects the negative electrode of diode D7, and the anode of diode D7 connects the C utmost point of triode Q5, the E utmost point ground connection of triode Q5, and the C utmost point of triode Q5 connects resistance R 22, and the other end of resistance R 22 connects the 5V power supply; The B utmost point of triode Q5 connects resistance R 26, and the other end of resistance R 26 connects the quiet control of microprocessor; Back level power amplifier power supply connects resistance R 6, and the other end of resistance R 6 connects the negative electrode of controllable silicon U1, and the control utmost point of controllable silicon U1 connects resistance R 10, and the other end of resistance R 10 connects the 12V power supply.
2, the switching on and shutting down de-noising circuit of LCD TV as claimed in claim 1 is characterized in that: described triode Q3 is the positive-negative-positive triode; Described triode Q1, Q2, Q4, Q5, Q6, Q7, Q8, Q9, Q10 are NPN type triodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009201364616U CN201369777Y (en) | 2009-01-20 | 2009-01-20 | On-off noise elimination circuit of LCD (liquid crystal display) TV |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009201364616U CN201369777Y (en) | 2009-01-20 | 2009-01-20 | On-off noise elimination circuit of LCD (liquid crystal display) TV |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201369777Y true CN201369777Y (en) | 2009-12-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2009201364616U Expired - Fee Related CN201369777Y (en) | 2009-01-20 | 2009-01-20 | On-off noise elimination circuit of LCD (liquid crystal display) TV |
Country Status (1)
| Country | Link |
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| CN (1) | CN201369777Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219016A (en) * | 2013-04-16 | 2013-07-24 | 广东欧珀移动通信有限公司 | Compact disk player circuit |
| CN103458342A (en) * | 2013-09-18 | 2013-12-18 | 上海贝岭股份有限公司 | Circuit eliminating shutdown POP sound of audio power amplifier |
| CN109429140A (en) * | 2017-08-28 | 2019-03-05 | 深圳市三诺数字科技有限公司 | A kind of sound equipment power-off noise suicide circuit |
| 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 |
-
2009
- 2009-01-20 CN CNU2009201364616U patent/CN201369777Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219016A (en) * | 2013-04-16 | 2013-07-24 | 广东欧珀移动通信有限公司 | Compact disk player circuit |
| CN103219016B (en) * | 2013-04-16 | 2015-08-19 | 广东欧珀移动通信有限公司 | A kind of Compact disk player circuit |
| CN103458342A (en) * | 2013-09-18 | 2013-12-18 | 上海贝岭股份有限公司 | Circuit eliminating shutdown POP sound of audio power amplifier |
| CN103458342B (en) * | 2013-09-18 | 2016-08-17 | 上海贝岭股份有限公司 | A kind of circuit eliminating shutdown POP sound of audio power amplifier |
| CN109429140A (en) * | 2017-08-28 | 2019-03-05 | 深圳市三诺数字科技有限公司 | A kind of sound equipment power-off noise suicide circuit |
| CN109429140B (en) * | 2017-08-28 | 2023-06-13 | 深圳市三诺数字科技有限公司 | Sound equipment outage noise elimination circuit |
| 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 |
| CN110381409B (en) * | 2019-08-13 | 2021-11-26 | 高创(苏州)电子有限公司 | Control panel of display, driving method thereof and display |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091223 Termination date: 20140120 |