CN203872267U - LED TV power supply backlight driving circuit - Google Patents
LED TV power supply backlight driving circuit Download PDFInfo
- Publication number
- CN203872267U CN203872267U CN201420254099.3U CN201420254099U CN203872267U CN 203872267 U CN203872267 U CN 203872267U CN 201420254099 U CN201420254099 U CN 201420254099U CN 203872267 U CN203872267 U CN 203872267U
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- power supply
- led
- drive circuit
- driving circuit
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Abstract
The utility model discloses an LED TV power supply backlight driving circuit comprising a flyback DC-DC power supply and an LED driving circuit. An output control signal of the LED driving circuit can be coupled with a switch tube control electrode of the flyback DC-DC power supply by a transformer. The LED TV power supply backlight driving circuit is advantageous in that the flyback power supply and the LED driving circuit can be integrated together by the transformer, and the conventional power supply module and the conventional driving module can be integrated together, and therefore the circuit can be simplified, and the costs can be saved; and at the same time, the diode bridge rectifier part of the flyback power supply is provided with a filter capacitor, and the interference of the output higher harmonic can be reduced, and the EMI interference can be further prevented.
Description
Technical field
The present invention relates to a kind of LED TV power supply backlight drive circuit, belong to LED TV domain.
Background technology
Modern panel TV mostly adopts liquid crystal display (LCD), and itself does not have luminous characteristic, during use, must can reach display effect by backlight.Light-emitting diode (LED) is because it is containing heavy metal Hg, and the advantages such as color rendition is good, fast response time, the energy-saving safety life-span is long, volume is little have become the mainstream technology of backlight.
As shown in Figure 1, the LED lamp bar of liquid crystal display is positioned at the lateral section of backboard 1, and it is round inner circuit.In the centre of backboard 1, be respectively equipped with mainboard module, power module and driver module.Mainboard module is the processing section of signal, and power module provides electric power supply for whole television set, and driver module provides constant electric current supply and various protection circuit functions are provided for LED lamp bar.The electrical connection of this mode is connected with wire rod by terminal, often occurs the mistake of connection in the process of assembling, in the process of plug, damages gang socket, because line is loaded down with trivial details, can bring the problems such as EMC.
Summary of the invention
Goal of the invention: the present invention proposes a kind of LED TV power supply backlight drive circuit, solves the problem that often occurs connection error and damage while assembling between mainboard module, power module and driver module.
Technical scheme: the technical solution used in the present invention is a kind of LED TV power supply backlight drive circuit, comprise inverse-excitation type DC-DC power supply and LED drive circuit, the output control signal of described LED drive circuit is by the transformer coupled switch controlled utmost point to inverse-excitation type DC-DC power supply.
Preferably, described switching tube is NMOS pipe, and it controls very grid.Described transformer has the primary side coil being connected with LED drive circuit output, and controls with inverse-excitation type DC-DC power supply switch tube the secondary coil that the utmost point is connected.
Preferably, the output of the diode rectifier bridge of described inverse-excitation type DC-DC power supply is provided with the filter capacitor of series connection.Described inverse-excitation type DC-DC power supply is also provided with readiness control circuit interface.
Beneficial effect: the present invention, by transformer, has integrated flyback power supply and LED drive circuit, and existing power module and driver module are combined, and has simplified circuit and has saved cost.Diode rectification bridge portion at flyback power supply is provided with filter capacitor simultaneously, has reduced the interference of the high order harmonic component of output, further prevents that EMI from disturbing.
Accompanying drawing explanation
Fig. 1 is existing LED TV backlight circuit modular structure figure;
Fig. 2 is circuit topological structure schematic diagram of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand these embodiment is only not used in and limits the scope of the invention for the present invention is described, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the modification of various equivalents of the present invention.
The present invention combines power module of the prior art and driver module.As shown in Figure 2, the power driving circuit after integration, introduces diode rectifier bridge by civil power by filter capacitor and common mode choke, then passes through LC filtering, is connected to the positive pole of diode D.The positive pole of diode D is also connected with a NMOS pipe M1 of source ground, and power factor correction chip FAN7530 connects the grid of a NMOS pipe M1, realizes the correction of power factor.The negative pole of diode D arranges the filter capacitor of another ground connection, and civil power is carried out to filtering.Civil power is transformed into direct current after said process.
And then at diode D negative pole, LLC half-bridge resonance circuit is set and realizes DC-DC conversion.Particularly, the 2nd NMOS pipe M2 and the 3rd NMOS pipe M3 connecting is set between diode D negative pole and ground.The 2nd NMOS pipe M2 drain electrode connects diode D negative pole, and its source electrode connects the drain electrode of the 3rd NMOS pipe M3, the 3rd NMOS pipe M3 source ground.The grid of the 2nd NMOS pipe M2 and the 3rd NMOS pipe M3 is all connected to tapped the second transformer T2, and its centre tap connects the public point of the 2nd NMOS pipe M2 and the 3rd NMOS pipe M3.The second transformer T2 is coupled to the control signal of LED control chip MP4653 output the grid of the 2nd NMOS pipe M2 and the 3rd NMOS pipe M3.One end ground connection of the primary coil of the first transformer T1, the other end is connected to the source electrode of the 2nd NMOS pipe M2 by resonant capacitance C1.The first transformer T1 is combined transformer, and it includes magnetizing inductance, and magnetizing inductance, transformer leakage inductance and resonant capacitance C1 form the LLC structure with two resonance frequencys.The drain electrode of the 2nd NMOS pipe M2 is provided with readiness control circuit interface PFC, for connecting optional readiness control circuit, as shown in Fig. 3 dotted line frame.Readiness control circuit is comprised of MIP2M2 chip and peripheral circuit thereof.
The secondary of the first transformer T1 comprises that two possess tapped same secondary coil.Wherein the two ends of a road secondary coil are connected to the input of diode rectifier bridge, and described diode rectifier bridge comprises the 5th diode D105 to the eight diode D108.The 63 capacitor C r63 is between an input of this secondary coil and diode rectifier bridge, itself and this secondary coil plays the effect of series resonance jointly, signal to secondary coil output carries out shaping, the capacitance of the 63 capacitor C r63 be can adjust particularly, gain and waveform adjusted.Described the 6th diode D106 negative pole connects two-way L-BAR, and the 5th diode D105 negative pole connects other two-way L-BAR.Between the 5th diode D105 negative pole and the 6th diode D106 negative pole, connect the 65 capacitor C r65 and the 64 capacitor C r64, the positive pole of the public point of these two electric capacity and the 8th diode D108 is connected to overcurrent protection port OCP jointly.The 65 capacitor C r65 and the 64 capacitor C r64 carry out filtering to outputing to the signal of L-BAR.Through the filtering of above-mentioned electric capacity, reduced the interference of the high order harmonic component of output, further prevent that EMI from disturbing.Overcurrent protection port OCP is connected to the corresponding output end on mainboard module, and the port of overcurrent protection simultaneously OCP is by the 5th resistance R 105 ground connection of metering function.
Another secondary coil is connected to the diode half-bridge input being comprised of the first diode D101 and the second diode D102, then passes through the filtering of the 59 capacitor C 59 of ground connection, forms output voltage V o to other module for power supply.
Claims (5)
1. a LED TV power supply backlight drive circuit, comprises inverse-excitation type DC-DC power supply and LED drive circuit, it is characterized in that, the output control signal of described LED drive circuit is by the transformer coupled switch controlled utmost point to inverse-excitation type DC-DC power supply.
2. LED TV power supply backlight drive circuit according to claim 1, is characterized in that, described switching tube is NMOS pipe, and it controls very grid.
3. LED TV power supply backlight drive circuit according to claim 1, is characterized in that, described transformer has the primary side coil being connected with LED drive circuit output, and controls with inverse-excitation type DC-DC power supply switch tube the secondary coil that the utmost point is connected.
4. LED TV power supply backlight drive circuit according to claim 1, is characterized in that, the output of the diode rectifier bridge of described inverse-excitation type DC-DC power supply is provided with the filter capacitor of series connection.
5. LED TV power supply backlight drive circuit according to claim 1, is characterized in that, described inverse-excitation type DC-DC power supply is also provided with readiness control circuit interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420254099.3U CN203872267U (en) | 2014-05-16 | 2014-05-16 | LED TV power supply backlight driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420254099.3U CN203872267U (en) | 2014-05-16 | 2014-05-16 | LED TV power supply backlight driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203872267U true CN203872267U (en) | 2014-10-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420254099.3U Expired - Fee Related CN203872267U (en) | 2014-05-16 | 2014-05-16 | LED TV power supply backlight driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203872267U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106954315A (en) * | 2017-05-08 | 2017-07-14 | 深圳创维－Rgb电子有限公司 | The driving power supply and television set of a kind of connection in series-parallel LED light bar network |
| CN110277769A (en) * | 2019-07-17 | 2019-09-24 | 上海希形科技有限公司 | LLC power input excess voltage protection and over-voltage protection method |
| CN111063296A (en) * | 2020-01-11 | 2020-04-24 | 安徽成业电子科技有限公司 | LED display screen power switch control system |
-
2014
- 2014-05-16 CN CN201420254099.3U patent/CN203872267U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106954315A (en) * | 2017-05-08 | 2017-07-14 | 深圳创维－Rgb电子有限公司 | The driving power supply and television set of a kind of connection in series-parallel LED light bar network |
| CN110277769A (en) * | 2019-07-17 | 2019-09-24 | 上海希形科技有限公司 | LLC power input excess voltage protection and over-voltage protection method |
| CN111063296A (en) * | 2020-01-11 | 2020-04-24 | 安徽成业电子科技有限公司 | LED display screen power switch control system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 214241 Jiangsu province Wuxi City District Xu Yixing City Industrial Road No. 5 Patentee after: Jiangsu Litong electronic Limited by Share Ltd Address before: 214241 Jiangsu province Wuxi City District Xu Yixing City Industrial Road No. 5 Patentee before: Jiangsu Lettall Electronic Co., Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141008 Termination date: 20210516 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |