CN106910475A - New type liquid crystal television carries on the back lamp drive circuit - Google Patents
New type liquid crystal television carries on the back lamp drive circuit Download PDFInfo
- Publication number
- CN106910475A CN106910475A CN201710293971.3A CN201710293971A CN106910475A CN 106910475 A CN106910475 A CN 106910475A CN 201710293971 A CN201710293971 A CN 201710293971A CN 106910475 A CN106910475 A CN 106910475A
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- transformer
- lamp drive
- pin
- ground wire
- liquid crystal
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Liquid Crystal Display Device Control (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention relates to LCD TV back of the body lamp actuation techniques.The overshoot current when present invention solves the problems, such as that traditional liquid crystal TV LED back of the body lamps are dimmed may damage back of the body lamp and light modulation metal-oxide-semiconductor, it is proposed that a kind of new type liquid crystal television carries on the back lamp drive circuit, and its technical scheme can be summarized as：Including direct current supply module, ground wire, transformer, LED light group and back of the body lamp drive control circuit module, it is characterised in that also including the first metal-oxide-semiconductor, the second electric capacity and the second diode.The beneficial effects of the invention are as follows the Same Name of Ends by transformer is reverse, realizes the negative sense output of back of the body modulating voltage, reduces overshoot current so as to protect back of the body lamp with light modulation metal-oxide-semiconductor, it is adaptable to LCD TV.
Description
Technical field
The present invention relates to liquid crystal tv technology, more particularly to LCD TV back of the body lamp actuation techniques.
Background technology
Liquid crystal television backlight system has been sent out from traditional cathode fluorescent tube (CCFL), external electrode fluorescence lamp (EEFL)
Exhibition LED till now, LED and traditional fluorescent tube backlight ratio, there is the advantages such as low in energy consumption, small volume.Opened up in LED back of the body lamp drive circuits
Flutter in structure, relatively more is to produce D/C voltage, then the BOOST boosting driving back of the body lamps for passing through DC-DC, this circuit with AC-DC
Topology application comparative maturity.
In BOOST drives LED back of the body lamp circuit systems, general LCD TV can use PWM count word dimming mode, the light modulation
The circuit of mode is mainly characterized by using light modulation metal-oxide-semiconductor, is here the first metal-oxide-semiconductor Q1, the break-make of control back of the body lamp current, back of the body lamp electricity
Stream being the switch change between maximum and 0 during dimming, its circuit diagram referring to Fig. 1, specially：The sun of the first diode D1
Pole connects the 3rd pin of transformer, and negative electrode connects the positive pole of the first electric capacity C1, the positive pole connection direct current input of the first electric capacity C1
Voltage, negative pole connection ground wire, the 4th pin connection ground wire of transformer, the 5th of the anode connection transformer of the 3rd diode D3 the
Pin, negative electrode connects the positive pole of the 3rd electric capacity C3, the negative pole connection ground wire of the 3rd electric capacity C3, one end connection the of the first inductance L1
The negative electrode of three diode D3, the other end connects the anode of the 4th diode D4, and the negative electrode of the 4th diode D4 connects the 4th respectively
The positive pole of electric capacity C4 and the positive pole of LED light group, the negative pole connection ground wire of the 4th electric capacity C4, the negative pole of LED light group connect a MOS
The drain electrode of pipe Q1, the source electrode connection ground wire of the first metal-oxide-semiconductor Q1, the grid connection back of the body lamp drive control circuit mould of the first metal-oxide-semiconductor Q1
The anode of the 4th diode D4 of drain electrode connection of the output pin DRV, the second metal-oxide-semiconductor Q2 of block, the source electrode connection of the second metal-oxide-semiconductor Q2
Ground wire, the boosting rectifier control pin BOOST of the grid connection back of the body lamp drive control circuit module of the second metal-oxide-semiconductor Q2.Which is dimmed
When electric current is opened, because the scheme of back of the body lamp design is different, have part can in lamp is carried on the back the larger overshoot current of producing ratio, this mistake
Electric current is rushed to be possible to damage back of the body lamp and light modulation metal-oxide-semiconductor, i.e. the first metal-oxide-semiconductor Q1.
The content of the invention
The purpose of the present invention is to propose to a kind of new type liquid crystal television back of the body lamp drive circuit, the traditional liquid crystal TV LED back ofs the body are solved
Overshoot current when lamp is dimmed may damage the problem of back of the body lamp and light modulation metal-oxide-semiconductor.
The present invention solves its technical problem, and the technical scheme of use is that new type liquid crystal television carries on the back lamp drive circuit, including straight
Stream power supply module, ground wire, transformer, LED light group and back of the body lamp drive control circuit module, it is characterised in that also including a MOS
Pipe, the second electric capacity and the second diode, the direct current supply module connect transformer, the negative electrode connection transformer of the second diode
The 6th pin, anode connects the negative pole of the second electric capacity, the positive pole connection ground wire of the second electric capacity, the negative pole connection the of LED light group
The anode of two diodes, positive pole connection ground wire, the 5th pin of the drain electrode connection transformer of the first metal-oxide-semiconductor, source electrode connection ground wire,
Grid connection back of the body lamp drive control circuit module.
It is further that the first pin of the transformer, the 4th pin and the 6th pin are Same Name of Ends.
It is further that the back of the body lamp drive control drive circuit module is used for constant-current driving LED lamp group.
It is further that the direct current supply module specifically includes the first diode, the first electric capacity and DC input voitage,
The anode of first diode connects the 3rd pin of transformer, and negative electrode connects the positive pole of the first electric capacity, and the first electric capacity is just
Pole connects DC input voitage, negative pole connection ground wire, the 4th pin connection ground wire of transformer.
The beneficial effects of the invention are as follows, lamp drive circuit is carried on the back by above-mentioned new type liquid crystal television, the Same Name of Ends of transformer is anti-
To, realize the back of the body modulating voltage negative sense output, reduce LCD TV the back of the body lamp light modulation overshoot current so as to protect the back of the body lamp and
Light modulation metal-oxide-semiconductor.
Brief description of the drawings
Fig. 1 is that traditional liquid crystal TV carries on the back lamp drive control circuit diagram.
Fig. 2 is the circuit diagram of the embodiment of the present invention.
Wherein, D1 is the first diode, and D2 is the second diode, and D3 is the 3rd diode, and D4 is the 4th diode, and C1 is
First electric capacity, C2 is the second electric capacity, and C3 is the 3rd electric capacity, and C4 is the 4th electric capacity, and Q1 is the first metal-oxide-semiconductor, that is, dim metal-oxide-semiconductor, Q2
It is the second metal-oxide-semiconductor, L1 is the first inductance, and VCC is DC input voitage, and DRV is that the output for carrying on the back lamp drive control circuit module is drawn
Pin, BOOST is the boosting rectifier control pin for carrying on the back lamp drive control circuit module, and 1 is the first pin of transformer, and 2 is transformer
Second pin, 3 is the 3rd pin of transformer, and 4 is the 4th pin of transformer, and 5 is the 5th pin of transformer, and 6 is transformation
6th pin of device.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment, technical scheme is described in detail.
New type liquid crystal television back of the body lamp drive circuit of the present invention is by direct current supply module, ground wire, transformer, LED light group, back of the body lamp
Drive control circuit module, the first metal-oxide-semiconductor Q1, the second electric capacity C2 and the second diode D2 composition, wherein, direct current supply module connects
Transformer is connect, the negative electrode of the second diode D2 connects the 6th pin of transformer, and anode connects the negative pole of the second electric capacity C2, second
The positive pole connection ground wire of electric capacity C2, the negative pole of LED light group connects the anode of the second diode D2, positive pole connection ground wire, a MOS
5th pin of the drain electrode connection transformer of pipe Q1, source electrode connection ground wire, grid connection back of the body lamp drive control circuit module.
Embodiment
The present embodiment new type liquid crystal television the back of the body lamp drive circuit include direct current supply module, ground wire, transformer, LED light group,
Back of the body lamp drive control circuit module, the first metal-oxide-semiconductor Q1, the second electric capacity C2 and the second diode D2, its circuit diagram is referring to figure
2.Wherein, direct current supply module connection transformer, the negative electrode of the second diode D2 connects the 6th pin of transformer, anode connection
The negative pole of the second electric capacity C2, the positive pole connection ground wire of the second electric capacity C2, the negative pole of LED light group connects the sun of the second diode D2
Pole, positive pole connection ground wire, the 5th pin of the drain electrode connection transformer of the first metal-oxide-semiconductor Q1, source electrode connection ground wire, the grid connection back of the body
Lamp drive control circuit module.
In foregoing circuit, the first pin 1 of transformer, the 4th pin 4 and the 6th pin 6 are Same Name of Ends；Back of the body lamp drives control
The output pin DRV of drive circuit module processed connects the grid of the first metal-oxide-semiconductor Q1；Direct current supply module specifically includes the first diode
D1, the first electric capacity C1 and DC input voitage, wherein, the anode of the first diode D1 connects the 3rd pin of transformer, negative electrode
Connect the positive pole of the first electric capacity C1, the positive pole connection DC input voitage of the first electric capacity C1, negative pole connection ground wire, the of transformer
Four pins connect ground wire.
In practical application, lamp drive control circuit is carried on the back using new type liquid crystal television of the present invention, can reach following effect：
A. the first metal-oxide-semiconductor Q1 of the invention is open-minded under the control of PWM dim signals, due to the first metal-oxide-semiconductor Q1 source grounds, that
The drain electrode of the first metal-oxide-semiconductor Q1 is equally grounded (ignore conduction voltage drop), and LED light group positive pole now is also grounded；
The negative pole of b.LED lamp groups connects the positive pole of the second diode D2, because two secondary windings Same Name of Ends of transformer are anti-
To, therefore the second diode D2 output negative voltage, i.e. LED light group cathode voltage are less than ground voltage, now LED light group conducting hair
Light, has back of the body lamp current to flow through in the first metal-oxide-semiconductor Q1；
C. the first metal-oxide-semiconductor Q1 is open-minded no-voltage, simultaneously because transformer limit the back of the body lamp current mutation, therefore
Overshoot current will not be produced in LED light group and the first metal-oxide-semiconductor Q1.
Claims (4)
1. new type liquid crystal television back of the body lamp drive circuit, including direct current supply module, ground wire, transformer, LED light group and back of the body lamp drive
Control circuit module, it is characterised in that also including the first metal-oxide-semiconductor, the second electric capacity and the second diode, the direct current supply module
Connection transformer, the negative electrode of the second diode connects the 6th pin of transformer, and anode connects the negative pole of the second electric capacity, the second electricity
The positive pole connection ground wire of appearance, the negative pole of LED light group connects the anode of the second diode, positive pole connection ground wire, the leakage of the first metal-oxide-semiconductor
Pole connects the 5th pin of transformer, source electrode connection ground wire, grid connection back of the body lamp drive control circuit module.
2. new type liquid crystal television according to claim 1 carries on the back lamp drive circuit, it is characterised in that the first of the transformer
Pin, the 4th pin and the 6th pin are Same Name of Ends.
3. new type liquid crystal television according to claim 1 carries on the back lamp drive circuit, it is characterised in that the back of the body lamp drive control
Drive circuit module is used for constant-current driving LED lamp group.
4. new type liquid crystal television according to claim 1 carries on the back lamp drive circuit, it is characterised in that the direct current supply module
Specifically include the first diode, the first electric capacity and DC input voitage, the of the anode connection transformer of first diode
Three pins, negative electrode connects the positive pole of the first electric capacity, and the positive pole connection DC input voitage of the first electric capacity, negative pole connection ground wire becomes
The 4th pin connection ground wire of depressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710293971.3A CN106910475B (en) | 2017-04-28 | 2017-04-28 | New type liquid crystal television back light driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710293971.3A CN106910475B (en) | 2017-04-28 | 2017-04-28 | New type liquid crystal television back light driving circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106910475A true CN106910475A (en) | 2017-06-30 |
| CN106910475B CN106910475B (en) | 2019-06-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710293971.3A Active CN106910475B (en) | 2017-04-28 | 2017-04-28 | New type liquid crystal television back light driving circuit |
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| CN (1) | CN106910475B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113257198A (en) * | 2021-05-24 | 2021-08-13 | 四川长虹电器股份有限公司 | Driving circuit applied to backlight of LED television |
| WO2021185150A1 (en) * | 2020-03-18 | 2021-09-23 | 海信视像科技股份有限公司 | Display apparatus and display control method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10285947A (en) * | 1997-04-10 | 1998-10-23 | Murata Mfg Co Ltd | Piezoelectric-transformer driving device |
| CN1449642A (en) * | 2000-10-06 | 2003-10-15 | 皇家菲利浦电子有限公司 | Voltage feed push-pull resonant inverter for lcd backlighting |
| CN201994046U (en) * | 2011-04-18 | 2011-09-28 | 青岛海信电器股份有限公司 | Driving circuit and liquid crystal television |
| CN202008814U (en) * | 2011-04-20 | 2011-10-12 | 青岛海信电器股份有限公司 | Driving circuit and liquid crystal television |
| CN202261593U (en) * | 2011-09-13 | 2012-05-30 | 青岛海信电器股份有限公司 | Switching tube protection circuit, power supply circuit and television |
-
2017
- 2017-04-28 CN CN201710293971.3A patent/CN106910475B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10285947A (en) * | 1997-04-10 | 1998-10-23 | Murata Mfg Co Ltd | Piezoelectric-transformer driving device |
| CN1449642A (en) * | 2000-10-06 | 2003-10-15 | 皇家菲利浦电子有限公司 | Voltage feed push-pull resonant inverter for lcd backlighting |
| CN201994046U (en) * | 2011-04-18 | 2011-09-28 | 青岛海信电器股份有限公司 | Driving circuit and liquid crystal television |
| CN202008814U (en) * | 2011-04-20 | 2011-10-12 | 青岛海信电器股份有限公司 | Driving circuit and liquid crystal television |
| CN202261593U (en) * | 2011-09-13 | 2012-05-30 | 青岛海信电器股份有限公司 | Switching tube protection circuit, power supply circuit and television |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021185150A1 (en) * | 2020-03-18 | 2021-09-23 | 海信视像科技股份有限公司 | Display apparatus and display control method |
| US11783788B2 (en) | 2020-03-18 | 2023-10-10 | Hisense Visual Technology Co., Ltd. | Display apparatus and display control method |
| CN113257198A (en) * | 2021-05-24 | 2021-08-13 | 四川长虹电器股份有限公司 | Driving circuit applied to backlight of LED television |
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| Publication number | Publication date |
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| CN106910475B (en) | 2019-06-14 |
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