CN106910475B - New type liquid crystal television back light driving circuit - Google Patents
New type liquid crystal television back light driving circuit Download PDFInfo
- Publication number
- CN106910475B CN106910475B CN201710293971.3A CN201710293971A CN106910475B CN 106910475 B CN106910475 B CN 106910475B CN 201710293971 A CN201710293971 A CN 201710293971A CN 106910475 B CN106910475 B CN 106910475B
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- Prior art keywords
- back light
- transformer
- pin
- ground wire
- diode
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 17
- 239000003990 capacitor Substances 0.000 claims abstract description 31
- 239000004065 semiconductor Substances 0.000 claims abstract description 30
- 230000005611 electricity Effects 0.000 claims description 2
- 230000000051 modifying Effects 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 241000402062 Dolphin rhabdovirus Species 0.000 description 3
- 229910004682 ON-OFF Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 230000001131 transforming Effects 0.000 description 1
Classifications
-
- 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
Abstract
The present invention relates to LCD TV back light actuation techniques.The present invention solves the problems, such as that the overshoot current when light modulation of traditional liquid crystal TV LED back light may be damaged back light and light modulation metal-oxide-semiconductor, propose a kind of new type liquid crystal television back light driving circuit, its technical solution can be summarized as: including direct current supply module, ground wire, transformer, LED light group and back light drive control circuit module, it is characterized in that, further including the first metal-oxide-semiconductor, the second capacitor and the second diode.The invention has the advantages that the Same Name of Ends by transformer is reversed, the output of back light voltage negative sense is realized, reduce overshoot current to protect back light and light modulation metal-oxide-semiconductor, be suitable for LCD TV.
Description
Technical field
The present invention relates to liquid crystal tv technologies, in particular to LCD TV back light actuation techniques.
Background technique
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 in size.It is opened up in LED back light driving circuit
It flutters in structure, more is D/C voltage to be generated with AC-DC, then pass through the BOOST boosting driving back light of DC-DC, this circuit
Topology applies comparative maturity.
In BOOST driving LED back light circuit system, 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, controls the on-off of back light electric current, back light electricity
Stream is the switch change between maximum value and 0 during light modulation, circuit diagram referring to Fig. 1, specifically: the sun of first diode D1
Pole connects the third pin of transformer, and cathode connects the anode of first capacitor C1, the anode connection direct current input of first capacitor C1
Voltage, cathode connect ground wire, and the 4th pin of transformer connects ground wire, and the anode of third diode D3 connects the 5th of transformer the
Pin, cathode connect the anode of third capacitor C3, and the cathode of third capacitor C3 connects ground wire, one end connection of the first inductance L1 the
The cathode of three diode D3, the other end connect the anode of the 4th diode D4, and the cathode of the 4th diode D4 is separately connected the 4th
The anode of capacitor C4 and the anode of LED light group, the cathode of the 4th capacitor C4 connect ground wire, and the cathode of LED light group connects the first MOS
The drain electrode of pipe Q1, the source electrode of the first metal-oxide-semiconductor Q1 connect ground wire, and the grid of the first metal-oxide-semiconductor Q1 connects back light drive control circuit mould
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 light drive control circuit module of the second metal-oxide-semiconductor Q2.Which light modulation
When electric current is opened, since the scheme of back light design is different, there is part that can generate bigger overshoot current, this mistake in back light
Electric current is rushed to be possible to damage back light and dim metal-oxide-semiconductor, i.e. the first metal-oxide-semiconductor Q1.
Summary of the invention
The purpose of the present invention is to propose to a kind of new type liquid crystal television back light driving circuits, solve traditional liquid crystal TV LED back
Overshoot current when lamp dims may be damaged the problem of back light and light modulation metal-oxide-semiconductor.
The present invention solves its technical problem, the technical solution adopted is that, new type liquid crystal television back light driving circuit, including it is straight
Flow power supply module, ground wire, transformer, LED light group and back light drive control circuit module, which is characterized in that further include the first MOS
Pipe, the second capacitor and the second diode, the direct current supply module connect transformer, and the cathode of the second diode connects transformer
The 6th pin, anode connects the cathode of the second capacitor, the anode connection ground wire of the second capacitor, the cathode connection the of LED light group
The anode of two diodes, anode connection ground wire, the 5th pin of the drain electrode connection transformer of the first metal-oxide-semiconductor, source electrode connect ground wire,
Grid connects back light drive control circuit module.
Further, the first pin of the transformer, the 4th pin and the 6th pin are Same Name of Ends.
Further, the back light drive control drive circuit module is used for constant-current driving LED lamp group.
Further, the direct current supply module specifically includes first diode, first capacitor and DC input voitage,
The third pin of the anode connection transformer of the first diode, cathode connect the anode of first capacitor, and first capacitor is just
Pole connects DC input voitage, and cathode connects ground wire, and the 4th pin of transformer connects ground wire.
The invention has the advantages that by above-mentioned new type liquid crystal television back light driving circuit, the Same Name of Ends of transformer is anti-
To, realize back light voltage negative sense output, reduce LCD TV back light light modulation overshoot current to protect back light and
Dim metal-oxide-semiconductor.
Detailed description of the invention
Fig. 1 is traditional liquid crystal TV back light drive control circuit schematic diagram.
Fig. 2 is the circuit diagram of the embodiment of the present invention.
Wherein, D1 is first diode, and D2 is the second diode, and D3 is third diode, and D4 is the 4th diode, and C1 is
First capacitor, C2 are the second capacitor, and C3 is third capacitor, and C4 is the 4th capacitor, and Q1 is the first metal-oxide-semiconductor, i.e. light modulation metal-oxide-semiconductor, Q2
For the second metal-oxide-semiconductor, L1 is the first inductance, and VCC is DC input voitage, and DRV is that the output of back light drive control circuit module is drawn
Foot, BOOST are the boosting rectifier control pin of back light drive control circuit module, and 1 is the first pin of transformer, and 2 be transformer
Second pin, 3 be the third pin of transformer, and 4 be the 4th pin of transformer, and 5 be the 5th pin of transformer, and 6 be transformation
6th pin of device.
Specific embodiment
With reference to the accompanying drawings and embodiments, the technical schemes of the invention are described in detail.
New type liquid crystal television back light driving circuit of the present invention is by direct current supply module, ground wire, transformer, LED light group, back light
Drive control circuit module, the first metal-oxide-semiconductor Q1, the second capacitor C2 and the second diode D2 composition, wherein direct current supply module connects
Connecing transformer, the 6th pin of the cathode connection transformer of the second diode D2, anode connects the cathode of the second capacitor C2, and second
The anode connection ground wire of capacitor C2, the cathode of LED light group connect the anode of the second diode D2, anode connection ground wire, the first MOS
5th pin of the drain electrode connection transformer of pipe Q1, source electrode connect ground wire, and grid connects back light drive control circuit module.
Embodiment
The present embodiment new type liquid crystal television back light driving circuit include direct current supply module, ground wire, transformer, LED light group,
Back light drive control circuit module, the first metal-oxide-semiconductor Q1, the second capacitor C2 and the second diode D2, circuit diagram is referring to figure
2.Wherein, direct current supply module connects transformer, the 6th pin of the cathode connection transformer of the second diode D2, anode connection
The cathode of second capacitor C2, the anode connection ground wire of the second capacitor C2, the cathode of LED light group connect the sun of the second diode D2
Pole, anode connection ground wire, the 5th pin of the drain electrode connection transformer of the first metal-oxide-semiconductor Q1, source electrode connect ground wire, grid connection back
Lamp drive control circuit module.
In foregoing circuit, the first pin 1, the 4th pin 4 and the 6th pin 6 of transformer are Same Name of Ends；Back light driving control
The grid of output pin DRV the first metal-oxide-semiconductor of connection Q1 of drive circuit module processed；Direct current supply module specifically includes first diode
D1, first capacitor C1 and DC input voitage, wherein the third pin of the anode connection transformer of first diode D1, cathode
Connecting the anode of first capacitor C1, the anode connection DC input voitage of first capacitor C1, cathode connects ground wire, and the of transformer
Four pins connect ground wire.
In practical application, using new type liquid crystal television back light drive control circuit of the present invention, following effect can reach:
A. the first metal-oxide-semiconductor Q1 of the present invention is open-minded under the control of PWM dim signal, since the first metal-oxide-semiconductor Q1 source electrode is grounded, that
The drain electrode of first metal-oxide-semiconductor Q1 is equally grounded and (ignores conduction voltage drop), and LED light group anode at this time is also grounded；
The cathode of b.LED lamp group connects the anode of the second diode D2, since two secondary windings Same Name of Ends of transformer are anti-
To, therefore the second diode D2 exports negative voltage, i.e. LED light group cathode voltage is lower than ground voltage, the hair of LED light group conducting at this time
Light has back light electric current to flow through in the first metal-oxide-semiconductor Q1；
C. the first metal-oxide-semiconductor Q1 is that no-voltage is open-minded, simultaneously because transformer limits the mutation of back light electric current, therefore
Overshoot current will not be generated in LED light group and the first metal-oxide-semiconductor Q1.
Claims (3)
1. new type liquid crystal television back light driving circuit, including direct current supply module, ground wire, transformer, LED light group and back light driving
Control circuit module, which is characterized in that further include the first metal-oxide-semiconductor, the second capacitor and the second diode, the direct current supply module
Transformer, the 6th pin of the cathode connection transformer of the second diode are connected, anode connects the cathode of the second capacitor, the second electricity
The anode connection ground wire of appearance, the cathode of LED light group connect the anode of the second diode, anode connection ground wire, the leakage of the first metal-oxide-semiconductor
Pole connects the 5th pin of transformer, and source electrode connects ground wire, and grid connects back light drive control circuit module；
The direct current supply module specifically includes first diode, first capacitor and DC input voitage, the first diode
Anode connection transformer third pin, cathode connect first capacitor anode, first capacitor anode connection direct current input
Voltage, cathode connect ground wire, and the 4th pin of transformer connects ground wire.
2. new type liquid crystal television back light driving circuit according to claim 1, which is characterized 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 back light driving circuit according to claim 1, which is characterized in that the back light drive control
Drive circuit module is used for constant-current driving LED lamp group.
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 CN106910475A (en) | 2017-06-30 |
| CN106910475B true CN106910475B (en) | 2019-06-14 |
Family
ID=59210788
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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| Country | Link |
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| CN (1) | CN106910475B (en) |
Families Citing this family (2)
| 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 |
| 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10285947A (en) * | 1997-04-10 | 1998-10-23 | Murata Mfg Co Ltd | Piezoelectric-transformer driving device |
-
2017
- 2017-04-28 CN CN201710293971.3A patent/CN106910475B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| Publication number | Publication date |
|---|---|
| CN106910475A (en) | 2017-06-30 |
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