CN2891582Y - Multi-tube current control device for LCD backlight source - Google Patents
Multi-tube current control device for LCD backlight source Download PDFInfo
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- CN2891582Y CN2891582Y CN 200620002418 CN200620002418U CN2891582Y CN 2891582 Y CN2891582 Y CN 2891582Y CN 200620002418 CN200620002418 CN 200620002418 CN 200620002418 U CN200620002418 U CN 200620002418U CN 2891582 Y CN2891582 Y CN 2891582Y
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Abstract
A multi-tube current control apparatus of an LCD back light source is composed of an electronic power switch, a transformer, a convertor and an IC PWM control module, wherein the primary side of the transformer is connected with the electronic power switch and a group of two tubes are connected on the two ends of the secondary side of the transformer. The convertor with two groups of coils is connected on the other side of the four tubes, and the IC PWM control module is connected with the electronic power switch. The convertor is capable of effectively balancing the currents in the four tubes, and a control signal is exported to the electronic power switch through the IC PWM control module to control the signal exported by the electronic power switch, which achieves the purpose of controlling and maintaining the brightness of the tube.
Description
Technical field
The utility model is meant a kind of control device of keeping the lighting tube brightness of balance LCD backlight especially about a kind of multi-light tube current control device of LCD backlight.
Background technology
See also Fig. 1, be multi lamp tube control circuit Organization Chart commonly used, by among the figure as can be known, many fluorescent tubes control mode commonly used, connect an electronic power switch 12 in transformer 11 primary sides, and in transformer 11 secondary sides four fluorescent tubes 13 in parallel, the other end of this four fluorescent tube 13 is connected with three current transformers 14 again, and the other end of three current transformers 14 is connected with integrated circuit (IC) back coupling control module 15, IC being feedback control module 15 is connected with electronic power switch 12 again, to form a multi lamp tube control circuit 1; Feedback control module 15 detecting feedback current signals by IC, and after IC feedbacks control module 15 judgment processing, controlling signal can be exported to electronic power switch 12, control the signal that electronic power switch 12 is exported thus, and then reach control and keep the uniform purpose of lighting tube brightness.For the foregoing circuit framework will be that N fluorescent tube adopts N-1 current transformer, therefore in manufacturing cost and use, just produce suitable restriction, moreover under this framework,, therefore on current balance type, more be difficult for reaching owing to use assembly too much.
This shows that above-mentioned multi lamp tube control circuit commonly used still has many disappearances, real non-one kindhearted design, and demand urgently being improved.
Every shortcoming and deficiency that the present utility model people derives in view of above-mentioned multi lamp tube control circuit commonly used, be urgently to think to be improved innovation, and after concentrating on studies through taking great pains to attain one's goal for many years, successfully the multi-light tube current control device of the utility model LCD (LCD) backlight is finished in research and development finally.
The utility model content
But the purpose of this utility model is to provide a kind of active balance multi-light tube current, and can keep the evenly multi-light tube current control device of shinny LCD backlight of fluorescent tube.
A time purpose of the present utility model is to provide a kind of and has the stability that improves product and use, increase the service life, reduce product cost, dwindle the multi-light tube current control device that transformer size and saving are provided with the LCD backlight in space.
For achieving the above object, the technical scheme that the utility model adopted by: formed the multi-light tube current control device by electronic power switch, transformer, current transformer and pulse wave width modulation device (IC PWM) control module; Wherein this transformer primary side connects an electronic power switch, and connect one group two fluorescent tube respectively in the Circuit Fault on Secondary Transformer two ends, the current transformer that will have two groups of coils again is connected in the opposite side of four tubes, and this IC PWM control module is connected with electronic power switch, but the electric current that these current transformer active balance four tubes are flowed through, export controlling signal to electronic power switch by IC PWM control module again, with the signal exported of control electronic power switch, thereby reach control and keep the purpose of lighting tube brightness.
The utlity model has following advantage:
1. the multi-light tube current control device of the utility model LCD backlight, but active balance multi-light tube current can reach and keep evenly shinny purpose of fluorescent tube simultaneously.
2. the multi-light tube current control device of the utility model LCD backlight has the stability that improves product and use, increases the service life, reduces product cost, dwindles the transformer size and saving is provided with advantages such as space.
Description of drawings
See also the detailed description and the accompanying drawing thereof of following relevant the utility model specific embodiment, can further understand technology contents of the present utility model and purpose effect thereof; Relevant accompanying drawing of the present utility model is:
Fig. 1 is multi lamp tube control circuit Organization Chart commonly used.
Fig. 2 A is the circuit framework figure of the multi-light tube current control device embodiment 1 of the utility model LCD backlight.
Fig. 2 B is another circuit framework figure of the multi-light tube current control device embodiment 1 of the utility model LCD backlight.
Fig. 3 is the circuit framework figure of the multi-light tube current control device embodiment 2 of the utility model LCD backlight.
Fig. 4 is the circuit framework figure of the multi-light tube current control device embodiment 3 of the utility model LCD backlight.
Fig. 5 is the circuit framework figure of the multi-light tube current control device embodiment 4 of the utility model LCD backlight.
Major part conventional letter: 1. multi lamp tube control circuit, 11. transformer, 12. electronic power switch, 13. fluorescent tube, 14. current transformer, 15.IC back coupling control module, 2.LCD the multi-light tube current control device of backlight, 21. electronic power switch, 22. transformer, 23. current transformer, 24.IC PWM control module, 251. first fluorescent tube, 252. second fluorescent tube, 253. the 3rd fluorescent tube, 254. the 4th fluorescent tube, 26. impedance, 3.LCD the multi-light tube current control device of backlight, 31. electronic power switch, 32. transformer, 33. current transformer, 34.IC PWM control module, 351. first fluorescent tube, 352. second fluorescent tube, 353. the 3rd fluorescent tube, 354. the 4th fluorescent tube, 36. transformer, 4.LCD the multi-light tube current control device of backlight, 41. electronic power switch, 42. the transformer of two output windings, 421. first output winding, 422. second output winding, 43. current transformer, 44.IC PWM control module, 451. first fluorescent tube, 452. second fluorescent tube, 453. the 3rd fluorescent tube, 454. the 4th fluorescent tube, 5.LCD the multi-light tube current control device of backlight, 51. electronic power switch, 52. transformer, 531. first current transformer, 532. second current transformer, 54.ICPWM control module, 551. first fluorescent tube, 552. second fluorescent tube, 553. the 3rd fluorescent tube, 554. the 4th fluorescent tube, 555. the 5th fluorescent tube, 556. the 6th fluorescent tube.
Embodiment
Embodiment 1
See also Fig. 2 A, the utility model provides the circuit framework figure of the multi-light tube current control device embodiment 1 of LCD backlight, by among the figure as can be known, the multi-light tube current control device 2 of the utility model LCD backlight is made up of electronic power switch 21, transformer 22, current transformer 23 and IC PWM control module 24; These transformer 22 primary sides connect an electronic power switch 21, and connect one group two fluorescent tube 251 respectively in transformer 22 secondary side two ends, 252,253,254, and first fluorescent tube 251, second fluorescent tube 252, the other end of the 3rd fluorescent tube 253 and the 4th fluorescent tube 254 will with have two groups of coil (N1, N2) current transformer 23 connects, two groups of coil ratios of this current transformer 23 are 1, and this first fluorescent tube 251 is connected with coil N2 output, this second fluorescent tube 252 is connected with coil N1 input, the 3rd fluorescent tube 253 is connected with coil N1 output, 254 of the 4th fluorescent tubes are connected with coil N2 input, two groups of coil (N1 simultaneously flow through, N2) current opposite in direction, this IC PWM control module 24 is connected with electronic power switch 21, by current transformer 23 balances four tubes 251,252,253,254 electric currents of being flowed through, IC PWM control module 24 can export controlling signal to electronic power switch 21 simultaneously, controls the signal that electronic power switch 21 is exported thus, thereby reaches the purpose of controlling and keeping lighting tube brightness.
See also Fig. 2 B, the utility model provides another circuit framework figure of the multi-light tube current control device embodiment 1 of LCD backlight, by among the figure as can be known, be transformer 22 and fluorescent tube 251,252,253 with Fig. 2 A difference, between 254, one impedance 26 can be set again,, and then can increase the effect of lamp tube current balance with usefulness as impedance matching.
Embodiment 2
See also Fig. 3, the utility model provides the circuit framework figure of the multi-light tube current control device embodiment 2 of LCD backlight, by among the figure as can be known, the multi-light tube current control device 3 of the utility model LCD backlight, formed by electronic power switch 31, transformer 32,36, current transformer 33 and IC PWM control module 34; These transformer 32 primary sides are connected in electronic power switch 31, and connect one group two fluorescent tube 351 in transformer 32 secondary sides, 352, these transformer 36 primary sides are connected in electronic power switch 31 equally simultaneously, and connect one group two fluorescent tube 353 in transformer 36 secondary sides, 354, and first fluorescent tube 351, second fluorescent tube 352, the other end of the 3rd fluorescent tube 353 and the 4th fluorescent tube 354 will with have two groups of coil (N1, N2) current transformer 33 connects, two groups of coil ratios of this current transformer are 1, and this first fluorescent tube 351 is connected with coil N2 output, this second fluorescent tube 352 is connected with coil N1 input, the 3rd fluorescent tube 353 is connected with coil N1 output, 354 of the 4th fluorescent tubes are connected with coil N2 input, two groups of coil (N1 simultaneously flow through, N2) current opposite in direction, this IC PWM control module 34 is connected with electronic power switch 31, by current transformer 33 balances four tubes 351,352,353,354 electric currents of being flowed through, IC PWM control module 34 can export controlling signal to electronic power switch 31 simultaneously, control the signal that electronic power switch 31 is exported thus, thereby reach the purpose of controlling and keeping lighting tube brightness.
Embodiment 3
See also Fig. 4, the utility model provides the circuit framework figure of the multi-light tube current control device embodiment 3 of LCD backlight, by among the figure as can be known, the multi-light tube current control device 4 of the utility model LCD backlight is made up of electronic power switch 41, the transformer 42 with two output windings, current transformer 43 and IC PWM control module 44; These transformer 42 primary sides connect an electronic power switch 41, and in first output winding, 421 connections, two tubes 453 of transformer 42,454, second output winding 422 of transformer 42 then connects two tubes 451 again, 452, and first fluorescent tube 451, second fluorescent tube 452, the other end of the 3rd fluorescent tube 453 and the 4th fluorescent tube 454 will with have two groups of coil (N1, N2) current transformer 43 connects, two groups of coil ratios of this current transformer are 1, and this fluorescent tube 451 is connected with coil N2 output, this fluorescent tube 452 is connected with coil N1 input, this fluorescent tube 453 is connected with coil N1 output, 454 of this fluorescent tubes are connected with coil N2 input, two groups of coil (N1 simultaneously flow through, N2) current opposite in direction, this IC PWM control module 44 is connected with electronic power switch 41, by current transformer 43 balances four tubes 451,452,453,454 electric currents of being flowed through, IC PWM control module 44 can export controlling signal to electronic power switch 41 simultaneously, controls the signal that electronic power switch 41 is exported thus, thereby reaches the purpose of controlling and keeping lighting tube brightness.
Embodiment 4
See also Fig. 5, the utility model provides the circuit framework figure of the multi-light tube current control device embodiment 4 of LCD backlight, by among the figure as can be known, the multi-light tube current control device 5 of the utility model LCD backlight is made up of electronic power switch 51, transformer 52, first current transformer 531, second current transformer 532 and IC PWM control module 54; These transformer 52 primary sides connect an electronic power switch 51, and connect one group three fluorescent tube 551 respectively in transformer 52 secondary side two ends, 552,553,554,555,556, and first fluorescent tube 551, second fluorescent tube 552, the 3rd fluorescent tube 553, the 4th fluorescent tube 554, the other end of the 5th fluorescent tube 555 and the 6th fluorescent tube 556 will with have two groups of coil (N1, N2) first current transformer 531 and have two groups of coil (N3, N4) second current transformer 532 connects, the turn ratio of two groups of coils of this first current transformer 531 and second current transformer 532 is respectively 1, and this first fluorescent tube 551 is connected with coil N4 output, this second fluorescent tube 552 is to be connected with coil N2 output, the 3rd fluorescent tube 553 is to be connected with coil N1 input, 554 of the 4th fluorescent tubes are connected with coil N1 output, 555 of the 5th fluorescent tubes are connected with coil N3 output, 556 of the 6th fluorescent tubes are connected with coil N4 input, this IC PWM control module 54 is connected with electronic power switch 51, by two current transformers 531,532 balances, six tubes 551,552,553,554 electric currents of being flowed through, IC PWM control module 54 can export controlling signal to electronic power switch 51 simultaneously, controls the signal that electronic power switch 51 is exported thus, thereby reaches the purpose of controlling and keeping lighting tube brightness.Therefore can extend to a transformer easily by the utility model and reach (N/2)-1 a current transformer driving N fluorescent tube.
Above-listed detailed description specifies at the utility model embodiment's, only this embodiment is not in order to limit claim of the present utility model, allly do not break away from the equivalence that the utility model skill spirit does and implement or change, all should be contained in the utility model claim.
Claims (14)
1. the multi-light tube current control device of a LCD backlight is characterized in that comprising:
One electronic power switch is imported a direct current power signal, and is connected with the transformer primary side, can receive the controlling signal that pulse wave width modulation device control module is imported simultaneously;
One transformer, this transformer primary side connects electronic power switch, and can connect one group two fluorescent tube respectively in the Circuit Fault on Secondary Transformer two ends, the other end of first fluorescent tube, second fluorescent tube, the 3rd fluorescent tube and the 4th fluorescent tube can be connected with the current transformer with two groups of coil N1, N2;
One pulse wave width modulation device control module is exported a controlling signal to electronic power switch, controls the signal that electronic power switch is exported thus.
2. by the multi-light tube current control device of the described LCD backlight of claim 1, it is characterized in that: the turn ratio of two groups of coils of this current transformer is 1.
3. press the multi-light tube current control device of the described LCD backlight of claim 1, it is characterized in that: this first fluorescent tube is connected with coil N2 output, this second fluorescent tube is connected with coil N1 input, the 3rd fluorescent tube is connected with coil N1 output, the 4th fluorescent tube then is connected with coil N2 input, the current opposite in direction of flow through simultaneously two groups of coil N1, N2.
4. by the multi-light tube current control device of the described LCD backlight of claim 1, it is characterized in that: between this transformer and the fluorescent tube, an impedance can be set again.
5. the multi-light tube current control device of a LCD backlight is characterized in that comprising:
One electronic power switch is imported a direct current power signal, and is connected with the primary side of first transformer and second transformer, can receive the controlling signal that pulse wave width modulation device control module is imported simultaneously;
One first transformer and second transformer, this first transformer and the second transformer primary side connect electronic power switch, and can connect one group two fluorescent tube respectively in the secondary side of first transformer and second transformer, the other end of first fluorescent tube, second fluorescent tube, the 3rd fluorescent tube and the 4th fluorescent tube can be connected with the current transformer with two groups of coil N1, N2;
One pulse wave width modulation device control module is exported a controlling signal to electronic power switch, controls the signal that electronic power switch is exported thus.
6. by the multi-light tube current control device of the described LCD backlight of claim 5, it is characterized in that: the turn ratio of two groups of coils of this current transformer is 1.
7. press the multi-light tube current control device of the described LCD backlight of claim 5, it is characterized in that: this first fluorescent tube is connected with coil N2 output, this second fluorescent tube is connected with coil N1 input, the 3rd fluorescent tube is connected with coil N1 output, the 4th fluorescent tube then is connected with coil N2 input, the current opposite in direction of flow through simultaneously two groups of coil N1, N2.
8. the multi-light tube current control device of a LCD backlight is characterized in that comprising:
One electronic power switch is imported a direct current power signal, and is connected with a primary side with transformer of two output windings, can receive the controlling signal that pulse wave width modulation device control module is imported simultaneously;
One has the transformer of two output windings, this transformer primary side connects an electronic power switch, and connect the 3rd fluorescent tube and the 4th fluorescent tube in first output winding of transformer, second output winding of this transformer then connects first fluorescent tube and second fluorescent tube again, and the other end of first fluorescent tube, second fluorescent tube, the 3rd fluorescent tube and the 4th fluorescent tube can be connected with the current transformer with two groups of coil N1, N2;
One pulse wave width modulation device control module is exported a controlling signal to electronic power switch, controls the signal that electronic power switch is exported thus.
9. by the multi-light tube current control device of the described LCD backlight of claim 8, it is characterized in that: the turn ratio of two groups of coils of this current transformer is 1.
10. press the multi-light tube current control device of the described LCD backlight of claim 8, it is characterized in that: this first fluorescent tube is connected with coil N2 output, this second fluorescent tube is connected with coil N1 input, the 3rd fluorescent tube is connected with coil N1 output, the 4th fluorescent tube then is connected with coil N2 input, the current opposite in direction of flow through simultaneously two groups of coil N1, N2.
11. the multi-light tube current control device of a LCD backlight is characterized in that comprising:
One electronic power switch is imported a direct current power signal, and is connected with the transformer primary side, can receive the controlling signal that pulse wave width modulation device control module is imported simultaneously;
One transformer, this transformer primary side connects electronic power switch, and can connect one group three fluorescent tube respectively in the Circuit Fault on Secondary Transformer two ends, the other end of first fluorescent tube, second fluorescent tube, the 3rd fluorescent tube, the 4th fluorescent tube, the 5th fluorescent tube and the 6th fluorescent tube can be connected with second current transformer of first current transformer with two groups of coil N1, N2 and two groups of coil N3, N4;
One pulse wave width modulation device control module is exported a controlling signal to electronic power switch, controls the signal that electronic power switch is exported thus.
12. by the multi-light tube current control device of the described LCD backlight of claim 11, it is characterized in that: the turn ratio of two groups of coils of this first current transformer is that two groups of coil ratios of 1, the second current transformer are 1.
13. multi-light tube current control device by the described LCD backlight of claim 11, it is characterized in that: this first fluorescent tube is connected with coil N4 output, this second fluorescent tube is connected with coil N2 output, the 3rd fluorescent tube is connected with coil N1 input, the 4th fluorescent tube then is connected with coil N1 output, the 5th fluorescent tube then is connected with coil N3 output, and the 6th fluorescent tube then is connected with coil N4 input.
14. the multi-light tube current control device by the described LCD backlight of claim 11 is characterized in that: this multi-light tube current control device can expand to a transformer and reaches (N/2)-1 a current transformer driving N fluorescent tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620002418 CN2891582Y (en) | 2006-01-13 | 2006-01-13 | Multi-tube current control device for LCD backlight source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620002418 CN2891582Y (en) | 2006-01-13 | 2006-01-13 | Multi-tube current control device for LCD backlight source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2891582Y true CN2891582Y (en) | 2007-04-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620002418 Expired - Fee Related CN2891582Y (en) | 2006-01-13 | 2006-01-13 | Multi-tube current control device for LCD backlight source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2891582Y (en) |
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2006
- 2006-01-13 CN CN 200620002418 patent/CN2891582Y/en not_active Expired - Fee Related
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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: 20070418 Termination date: 20110113 |