CN106787849B - A kind of power circuit and liquid crystal display - Google Patents
A kind of power circuit and liquid crystal display Download PDFInfo
- Publication number
- CN106787849B CN106787849B CN201611177844.9A CN201611177844A CN106787849B CN 106787849 B CN106787849 B CN 106787849B CN 201611177844 A CN201611177844 A CN 201611177844A CN 106787849 B CN106787849 B CN 106787849B
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- resistance
- electric switch
- voltage
- power circuit
- mainboard
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 37
- 238000006243 chemical reaction Methods 0.000 claims abstract description 58
- 239000003990 capacitor Substances 0.000 claims abstract description 45
- 230000005611 electricity Effects 0.000 claims description 13
- 230000009466 transformation Effects 0.000 claims description 4
- 230000003760 hair shine Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000994 depressogenic effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
A kind of power circuit includes voltage conversion unit, resistance, transformer, capacitor, conversion module, mainboard, first and second electric switch and optocoupler unit, voltage conversion unit is for converting alternating current to the first direct current, transformer is used to the first direct current becoming the second direct current, first capacitor is connected to transformer, transformer is additionally coupled to mainboard and conversion module, first and second resistance is connected serially between voltage conversion unit and ground, to generate partial pressure, the control terminal of first electric switch receives partial pressure, the first end of first electric switch is connected to the primary of optocoupler unit, the secondary of optocoupler unit is connected to the control terminal of the second electric switch, the first end of second electric switch is connected to mainboard, the first end of second electric switch also passes through resistance and is connected to transformer, the second end of second electric switch is grounded, mainboard is connected to conversion module to drive conversion Module opens and closes backlight.The present invention improves the display performance of liquid crystal display.
Description
Technical field
The present invention relates to field of liquid crystal display more particularly to a kind of power circuits and liquid crystal display.
Background technique
With the continuous promotion and popularization of liquid crystal display, very high want is proposed to the display performance of liquid crystal display
It asks.Currently, in the power circuit of liquid crystal display such as LCD TV, alternating current convert output after direct current to the backlight of TV and
Main board power supply.After mainboard receives starting-up signal, mainboard transmits a signal to conversion module with by backlight lightening.But due to existing
There is the presence of bulky capacitor in some power circuits, which is stored with a large amount of electric energy, is pulling out power outlet (i.e. input AC
Electricity stops power supply) when, the electric energy of bulky capacitor storage may be output to mainboard and conversion module, and (i.e. the voltage of mainboard and conversion module is not
Can disappear immediately), it will lead to the picture of liquid crystal display after pulling out electricity and flash, to affect the display of liquid crystal display
Performance.
Summary of the invention
The present invention provides a kind of power circuit, to provide the display performance of liquid crystal display.
The present invention also provides a kind of liquid crystal displays.
The present invention provides a kind of power circuit, is used in liquid crystal display, to open and close the backlight of liquid crystal display, the electricity
Source circuit includes voltage conversion unit, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, transformer,
One capacitor, conversion module, mainboard, the first electric switch, the second electric switch and optocoupler unit, the voltage conversion unit is for receiving
Alternating voltage, and the alternating voltage is converted into the first DC voltage, the input terminal of the transformer is connected to the voltage
Converting unit, for by the first DC voltage transformation to the second DC voltage, the first capacitor to be connected to the transformer
Between output end and ground, the output end of the transformer is additionally coupled to the voltage end of the mainboard and conversion module, to export
For two DC voltages to the mainboard and conversion module, first and second described resistance is connected serially to the voltage conversion unit and ground
Between, to divide to first DC voltage, the control terminal of first electric switch is connected to first and second described electricity
Node between resistance, the first end of first electric switch are connected to the cathode of the diode of the optocoupler unit, and described first
The second end of electric switch is grounded, and the anode of the diode of the optocoupler unit receives a voltage, the switch of the optocoupler unit
First end is grounded by 3rd resistor, and is connected to the control terminal of second electric switch, and the of the switch of the optocoupler unit
Two ends are connected to the output end of the transformer by the 4th resistance, and the first end of second electric switch is connected to the mainboard
Identification end, to export enabling signal, the first end of second electric switch also passes through the 5th resistance and is connected to the transformer
Output end, second electric switch second end ground connection, the driving end of the mainboard is connected to the conversion module, with basis
The enabling signal drives the conversion module to open and close the backlight.
Wherein, the power circuit further includes the second capacitor, and second capacitor is connected in parallel with the first capacitor.
Wherein, the power circuit further includes the 6th resistance and third capacitor, the 6th resistance and the third capacitor
It is connected in parallel between the first end and second end of second electric switch.
Wherein, the power circuit further includes zener diode and the 7th resistance, the cathode connection of the zener diode
To the node of first and second resistance, the anode of the zener diode is connected to described the by the 7th resistance
The control terminal of one electric switch.
Wherein, the power circuit further includes the 4th capacitor, and the 4th capacitor is connected in parallel on the both ends of the second resistance.
Wherein, the power circuit further includes the 8th resistance and the 5th capacitor, and the 5th capacitor is connected in parallel on described second
The both ends of resistance, the 8th resistance and the 5th capacitor are connected in the control terminal and ground of first electric switch in parallel
Between.
Wherein, the power circuit further includes first diode and the second diode, first and second diode
Anode connection, and it is connected to the output end of the transformer, the cathode connection of first and second diode, and it is connected to institute
State mainboard and conversion module.
Wherein, first and second described electric switch is NPN type triode, the control terminal of first and second switch, the
One end and second end are respectively base stage, collector and the emitter of triode.
The present invention provides a kind of liquid crystal display, provides the above-mentioned electricity of voltage including liquid crystal display panel and for the liquid crystal display panel
Source circuit.
Power circuit of the invention is used in liquid crystal display, to open and close the backlight of liquid crystal display, the power circuit
Including voltage conversion unit, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, transformer, the first electricity
Appearance, conversion module, mainboard, the first electric switch, the second electric switch and optocoupler unit, the voltage conversion unit is for receiving exchange
Voltage, and the alternating voltage is converted into the first DC voltage, the input terminal of the transformer is connected to the voltage conversion
Unit, for by the first DC voltage transformation to the second DC voltage, the first capacitor to be connected to the output of the transformer
Between end and ground, the output end of the transformer is additionally coupled to the voltage end of the mainboard and conversion module, straight with output second
Galvanic electricity is depressed into the mainboard and conversion module, first and second described resistance is connected serially between the voltage conversion unit and ground,
To be divided to first DC voltage, the control terminal of first electric switch be connected to first and second described resistance it
Between node, the first end of first electric switch is connected to the cathode of the diode of the optocoupler unit, and described first establishes by cable
The second end of pass is grounded, anode one voltage of reception of the diode of the optocoupler unit, and the first of the switch of the optocoupler unit
End is grounded by 3rd resistor, and is connected to the control terminal of second electric switch, the second end of the switch of the optocoupler unit
The output end of the transformer is connected to by the 4th resistance, the first end of second electric switch is connected to the knowledge of the mainboard
It does not hold, to export enabling signal, the first end of second electric switch also passes through the 5th resistance and is connected to the defeated of the transformer
Outlet, the second end ground connection of second electric switch, the driving end of the mainboard is connected to the conversion module, according to
Enabling signal drives the conversion module to open and close the backlight.The present invention not will lead to connects alternating voltage power down liquid crystal outside
Show the phenomenon that picture of device flashes, to improve the display performance of liquid crystal display.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of circuit diagram for power circuit that first aspect of the present invention embodiment provides.
Fig. 2 is a kind of block diagram for liquid crystal display that second aspect of the present invention embodiment provides.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, first aspect of the present invention embodiment provides a kind of power circuit 100.The power circuit 100 is used for
In liquid crystal display, to open and close the backlight of liquid crystal display.The power circuit 100 includes the 10, first electricity of voltage conversion unit
Hinder R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, transformer T, first capacitor C1, conversion module
20, mainboard 30, the first electric switch Q1, the second electric switch Q2 and optocoupler unit U.The voltage conversion unit 10 is for receiving exchange
Voltage, and the alternating voltage is converted into the first DC voltage, the input terminal of the transformer T is connected to the voltage conversion
Unit 10, for by the first DC voltage transformation to the second DC voltage, the first capacitor C1 to be connected to the transformer T's
Between output end and ground, the output end of the transformer T is additionally coupled to the voltage end of the mainboard 30 and conversion module 20, with defeated
The second DC voltage to the mainboard 30 and conversion module 20, first and second resistance R1 and R2 is connected serially to the voltage out
Between converting unit 10 and ground, to divide to first DC voltage, the control terminal of the first electric switch Q1 is connected
Node to first and second resistance R1 and R2, the first end of the first electric switch Q1 are connected to the optocoupler list
The cathode of the diode of first U, the second end ground connection of the first electric switch Q1, the anode of the diode of the optocoupler unit U connect
A voltage is received, the first end of the switch of the optocoupler unit U is grounded by 3rd resistor R3, and is connected to second electric switch
The second end of the control terminal of Q2, the switch of the optocoupler unit U is connected to the output of the transformer T by the 4th resistance R4
End, the first end of the second electric switch Q2 are connected to the identification end of the mainboard 30, to export enabling signal, second electricity
The first end of switch Q2 also passes through the output end that the 5th resistance R5 is connected to the transformer T, and the of the second electric switch Q2
Two ends ground connection, the driving end of the mainboard 30 are connected to the conversion module 20, to turn according to enabling signal driving is described
Block 20 is changed the mold to open and close the backlight.
It should be noted that under normal circumstances, external alternating voltage normally exports, the voltage conversion unit 10 is by institute
It states alternating voltage and is converted into the first DC voltage, the first capacitor C1 is electrically charged, first and second resistance R1 and R2 pairs
Output is established by cable to the control terminal of the first electric switch Q1 to be connected described first after first DC voltage is divided
Close Q1.The second level body conducting of the optocoupler unit U shines at this time, passes the signal to secondary, the switch of the optocoupler unit U is led
It is logical.Output makes to the second electric switch Q2 after the third and the 4th resistance R3 and R4 divide first DC voltage
Obtain the second electric switch Q2 conducting, the identification end ground connection of the mainboard 30, the first driving of driving end output of the mainboard 30
Signal drives the conversion module 20 to continue to start the backlight.
On the contrary, working as external alternating voltage power down moment, the tension discharge on the first capacitor C1 is without immediately becoming
Zero, the start end of the mainboard 30 is high level.The mainboard 30 exports the second driving signal to the conversion module 20, so that
The conversion module 20 turns off the backlight.Since the backlight is without output, the picture of display is naturally not seen.So
The phenomenon that external alternating voltage power down film flicker would not occur.
Therefore, the power circuit 100 of the present embodiment not will lead to the picture for connecing alternating voltage power down liquid crystal display outside
The phenomenon that flashing, to improve the display performance of liquid crystal display.
Further, the power circuit 100 further includes the second capacitor C2, the second capacitor C2 and the first capacitor
C1 is connected in parallel.
The power circuit 100 further includes the 6th resistance R and third capacitor C3, the 6th resistance and the third capacitor
It is connected in parallel between the first end and second end of second electric switch.
The power circuit 100 further includes zener diode D and the 7th resistance R7, and the cathode of the zener diode D connects
It is connected on the node of first and second resistance R1 and R2, the anode of the zener diode D passes through the 7th resistance R7
It is connected to the control terminal of the first electric switch Q1.
The power circuit 100 further includes the 4th capacitor C4, and the 4th capacitor C4 is connected in parallel on the second resistance R2's
Both ends.
The power circuit 100 further includes the 8th resistance R8 and the 5th capacitor C5, and the 5th capacitor C5 is connected in parallel on described
The both ends of second resistance R2, the 8th resistance R8 and the 5th capacitor C5 are connected in the control of the first electric switch Q1 in parallel
Between end and ground processed.
Further, the power circuit 100 further includes first diode D2 and the second diode D3, described first and
The anode of two diode D2 and D3 connects, and is connected to the output end of the transformer T, first and second diode D2 and
The cathode of D3 connects, and is connected to the mainboard 30 and conversion module 20.
In the present embodiment, first and second electric switch Q1 and Q2 is NPN type triode, and described first and second is opened
Control terminal, first end and the second end for closing Q1 and Q2 are respectively base stage, collector and the emitter of triode.In other embodiments
In, first and second electric switch Q1 and Q2 can also be adjusted according to actual needs.
Referring to Fig. 2, second aspect of the present invention embodiment provides a kind of liquid crystal display 200.The liquid crystal display 200
The power circuit of voltage is provided including liquid crystal display panel 210 and for the liquid crystal display panel 210.The power circuit can be above-mentioned the
The power circuit 100 that one scheme provides.Since the specific structure of the power circuit 100 has been carried out detailed description, therefore
This is repeated no more.
In the present embodiment, under normal circumstances, external alternating voltage normally exports, and the voltage conversion unit 10 is by institute
It states alternating voltage and is converted into the first DC voltage, the first capacitor C1 is electrically charged, first and second resistance R1 and R2 pairs
Output is established by cable to the control terminal of the first electric switch Q1 to be connected described first after first DC voltage is divided
Close Q1.The second level body conducting of the optocoupler unit U shines at this time, passes the signal to secondary, the switch of the optocoupler unit U is led
It is logical.Output makes to the second electric switch Q2 after the third and the 4th resistance R3 and R4 divide first DC voltage
Obtain the second electric switch Q2 conducting, the identification end ground connection of the mainboard 30, the first driving of driving end output of the mainboard 30
Signal drives the conversion module 20 to continue to start the backlight.
On the contrary, working as external alternating voltage power down moment, the tension discharge on the first capacitor C1 is without immediately becoming
Zero, the start end of the mainboard 30 is high level.The mainboard 30 exports the second driving signal to the conversion module 20, so that
The conversion module 20 turns off the backlight.Since the backlight is without output, the picture of display is naturally not seen.So
The phenomenon that external alternating voltage power down film flicker would not occur.
Therefore, the power circuit 100 of the present embodiment not will lead to the picture for connecing alternating voltage power down liquid crystal display 200 outside
The phenomenon that face flashes, to improve the display performance of liquid crystal display 200.
Above disclosed is only a preferred embodiment of the present invention, cannot limit the power of the present invention with this certainly
Sharp range, those skilled in the art can understand all or part of the processes for realizing the above embodiment, and weighs according to the present invention
Benefit requires made equivalent variations, still belongs to the scope covered by the invention.
Claims (9)
1. a kind of power circuit is used in liquid crystal display, to open and close the backlight of liquid crystal display, which is characterized in that the electricity
Source circuit includes voltage conversion unit, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, transformer,
One capacitor, conversion module, mainboard, the first electric switch, the second electric switch and optocoupler unit, the voltage conversion unit is for receiving
Alternating voltage, and the alternating voltage is converted into the first DC voltage, the input terminal of the transformer is connected to the voltage
Converting unit, for by the first DC voltage transformation to the second DC voltage, the first capacitor to be connected to the transformer
Between output end and ground, the output end of the transformer is additionally coupled to the voltage end of the mainboard and conversion module, to export
For two DC voltages to the mainboard and conversion module, first and second described resistance is connected serially to the voltage conversion unit and ground
Between, to divide to first DC voltage, the control terminal of first electric switch is connected to first and second described electricity
Node between resistance, the first end of first electric switch are connected to the cathode of the diode of the optocoupler unit, and described first
The second end of electric switch is grounded, and the anode of the diode of the optocoupler unit receives a voltage, the switch of the optocoupler unit
First end is grounded by 3rd resistor, and is connected to the control terminal of second electric switch, and the of the switch of the optocoupler unit
Two ends are connected to the output end of the transformer by the 4th resistance, and the first end of second electric switch is connected to the mainboard
Identification end, to export enabling signal, the first end of second electric switch also passes through the 5th resistance and is connected to the transformer
Output end, second electric switch second end ground connection, the driving end of the mainboard is connected to the conversion module, with basis
The enabling signal drives the conversion module to open and close the backlight；
When external alternating voltage normally exports, the alternating voltage is converted into the first direct current by the voltage conversion unit
Pressure, the first capacitor are electrically charged, and output is to institute after first and second described resistance divides first DC voltage
The control terminal of the first electric switch, the first electric switch conducting are stated, the diode current flow of the optocoupler unit shines, signal is passed
It is sent to secondary, the switch conduction of the optocoupler unit, the third and the 4th resistance divide second DC voltage
After export to the second electric switch, the second electric switch conducting, the identification end ground connection of the mainboard, the driving end of the mainboard is defeated
The first driving signal drives the conversion module to continue to start the backlight out；
When external alternating voltage power down moment, tension discharge in the first capacitor, the diode of the optocoupler unit, institute
The switch and second electric switch for stating optocoupler unit are turned off, and the identification end of the mainboard is high level；The mainboard output
Second driving signal gives the conversion module, so that the conversion module turns off the backlight.
2. power circuit as described in claim 1, which is characterized in that the power circuit further includes the second capacitor, and described
Two capacitors are connected in parallel with the first capacitor.
3. power circuit as described in claim 1, which is characterized in that the power circuit further includes the 6th resistance and third electricity
Hold, the 6th resistance and the third capacitor are connected in parallel between the first end and second end of second electric switch.
4. power circuit as described in claim 1, which is characterized in that the power circuit further includes zener diode and the 7th
Resistance, the cathode of the zener diode are connected on the node of first and second resistance, the sun of the zener diode
Pole is connected to the control terminal of first electric switch by the 7th resistance.
5. power circuit as claimed in claim 4, which is characterized in that the power circuit further includes the 4th capacitor, and described
Four capacitors are connected in parallel on the both ends of the second resistance.
6. power circuit as claimed in claim 5, which is characterized in that the power circuit further includes the 8th resistance and the 5th electricity
Hold, the series circuit that the 5th capacitor, zener diode, the 7th resistance are collectively formed is connected in parallel on the two of the second resistance
End, the 8th resistance and the 5th capacitor are connected in parallel between the control terminal and ground of first electric switch.
7. power circuit as claimed in claim 6, which is characterized in that the power circuit further includes first diode and second
Diode, the anode connection of first and second diode, and is connected to the output end of the transformer, and described first and the
The cathodes of two diodes connects, and is connected to the mainboard and conversion module, and the output end of the transformer passes through described the
One and second diode be connected to the voltage end of the mainboard and conversion module.
8. power circuit as described in claim 1, which is characterized in that first and second described electric switch is NPN type triode,
Control terminal, first end and the second end of first and second switch are respectively base stage, collector and the emitter of triode.
9. a kind of liquid crystal display, including liquid crystal display panel and for the liquid crystal display panel provide voltage as claim 1-8 is any
Power circuit described in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611177844.9A CN106787849B (en) | 2016-12-19 | 2016-12-19 | A kind of power circuit and liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611177844.9A CN106787849B (en) | 2016-12-19 | 2016-12-19 | A kind of power circuit and liquid crystal display |
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| Publication Number | Publication Date |
|---|---|
| CN106787849A CN106787849A (en) | 2017-05-31 |
| CN106787849B true CN106787849B (en) | 2019-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611177844.9A Active CN106787849B (en) | 2016-12-19 | 2016-12-19 | A kind of power circuit and liquid crystal display |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107482907A (en) * | 2017-08-30 | 2017-12-15 | 广东美的厨房电器制造有限公司 | A kind of Switching Power Supply and its control method |
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|---|---|---|---|---|
| CN201054669Y (en) * | 2007-06-26 | 2008-04-30 | 深圳创维－Rgb电子有限公司 | Power circuit |
| CN101308630A (en) * | 2007-05-18 | 2008-11-19 | 群康科技(深圳)有限公司 | LCD device |
| CN201210722Y (en) * | 2008-02-29 | 2009-03-18 | 四川长虹电器股份有限公司 | System auxiliary reset circuit |
| CN202797863U (en) * | 2012-09-28 | 2013-03-13 | 东莞市奥源电子科技有限公司 | Time sequence protection circuit of electronic product |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100466329B1 (en) * | 2003-03-04 | 2005-01-14 | 현대 이미지퀘스트(주) | Power saving circuit for display |
-
2016
- 2016-12-19 CN CN201611177844.9A patent/CN106787849B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101308630A (en) * | 2007-05-18 | 2008-11-19 | 群康科技(深圳)有限公司 | LCD device |
| CN201054669Y (en) * | 2007-06-26 | 2008-04-30 | 深圳创维－Rgb电子有限公司 | Power circuit |
| CN201210722Y (en) * | 2008-02-29 | 2009-03-18 | 四川长虹电器股份有限公司 | System auxiliary reset circuit |
| CN202797863U (en) * | 2012-09-28 | 2013-03-13 | 东莞市奥源电子科技有限公司 | Time sequence protection circuit of electronic product |
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| CN106787849A (en) | 2017-05-31 |
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Address after: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee after: TCL China Star Optoelectronics Technology Co.,Ltd. Address before: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee before: Shenzhen China Star Optoelectronics Technology Co.,Ltd. |
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