CN2696093Y - Transformer and fluorescent tube driving device using the transformer - Google Patents
Transformer and fluorescent tube driving device using the transformer Download PDFInfo
- Publication number
- CN2696093Y CN2696093Y CN 200420036364 CN200420036364U CN2696093Y CN 2696093 Y CN2696093 Y CN 2696093Y CN 200420036364 CN200420036364 CN 200420036364 CN 200420036364 U CN200420036364 U CN 200420036364U CN 2696093 Y CN2696093 Y CN 2696093Y
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- magnetic core
- coil
- transformer
- bobbin
- voltage signal
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Abstract
The utility model relates to a transformer, comprising a bobbin, a first magnetic core, a first coil, a second coil, and a second magnetic core. The first magnetic core is arranged in the bobbin, and the first coil and the second coil are respectively convoluted with the periphery of the bobbin. The second magnetic core is covered and arranged on the outside of the bobbin. Wherein, a main magnetic flux is formed between the first magnetic core and the second magnetic core. The utility model relates to a fluorescent tube driving device, comprising the transformer and a fluorescent tube. A first coil is coupled with a first voltage signal, and the second coil inducts and generates a second voltage signal; the fluorescent tube is driven by the second voltage signal.
Description
Technical field
The utility model relates to a kind of transformer, particularly relates to a kind of transformer that is used for the drive system of fluorescent tube.
Background technology
Along with the arriving of multimedia era, (Liquid Crystal Display, application LCD) will enlarge as the monitor of computer, LCD screen TV etc. LCD gradually.Generally speaking, LCD is used and is lightly reached dynamical lamp tube driver as backlight, therefore has thin thickness, the steady and audible characteristics of image quality.Lamp tube driver in the LCD mainly is by as cold-cathode tube (Cold Cathode Fluorescent Lamp, discharge lamp CCFL), and form in order to the transformer that drives cold-cathode tube.
Please be simultaneously with reference to Figure 1A and Figure 1B.Figure 1A illustrates is the exploded view of traditional transformer, and Figure 1B illustrates is the constitutional diagram of traditional transformer.Traditional transformer 100 is applicable to the cold-cathode tube that drives in the LCD.Transformer 100 mainly includes bobbin 102, an E font magnetic core 104, and the 2nd E font magnetic core 106.
First siding ring and second siding ring (not showing among the figure) curl up respectively around bobbin 102.The two ends of bobbin 102 dispose a plurality of metal pins 108.Metal pin 108 is in order to connecting first siding ring and second siding ring, and is soldered to circuit board.
The one E font magnetic core 104 and the 2nd E font magnetic core 106 are with the arrow direction as shown in Figure 1A mutually and close, and become shown in Figure 1B the transformer 100 through combination.And an E font magnetic core 104 and the 2nd E font magnetic core 106 mutual and that close are to form a magnetic flux in the pipe of bobbin 102 with outside the pipe.
Please refer to Fig. 2, what it illustrated is the vertical view of traditional transformer 100.In order to make accompanying drawing clear, the bobbin 102 of transformer 100 does not give and illustrating in Fig. 2.By can finding out in the accompanying drawing, an E font magnetic core 104 and the 2nd E font magnetic core 106 are mutually and close.First siding ring 210 and second siding ring 212 curl up around bobbin respectively.That is, first siding ring 210 and second siding ring 212 are respectively around the intermediate magnetic core segment of an E font magnetic core 104 and the 2nd E font magnetic core 106.
At the voltage signal of first siding ring 210 input one alternation, promptly can and the E font magnetic core 104 and the 2nd E font magnetic core 106 that close in, produce magnetic flux as shown in phantom in FIG..And, under the effect of this magnetic flux, at the voltage signal of second siding ring 212 another alternations of output.This is at another alternating voltage signal that secondary side produced, promptly in order to drive cold-cathode tube lighting.
Generally speaking, the top of the lamp tube driver of LCD is that cover is connected to a metal case.The metal case is avoided panel of LCD is caused interference in order to the EMI that the screened lamp tube drive device is produced.But because the slimming of LCD, the distance between metal case and the transformer 100 is promptly quite little.
In traditional transformer 100, the magnetic flux (shown in the dotted line of Fig. 2) that the alternating voltage signal of being imported by first siding ring 210 is produced, originally only be present in an E font magnetic core 104 and the 2nd E font magnetic core 106, and because the distance of metal case and transformer 100 is too little, therefore the magnetic flux of a part can other divide to the metal case, make transformer 100 produce the magnetic leakage phenomenon, cause the loss of magnetic flux.And the flux loss of transformer 100, to make the load effect of transformer 100 become big, tube current be difficult for balance, the voltage signal instability that second siding ring 212 is exported, make the cold-cathode tube that driven by transformer 100 produce luminous unsettled phenomenon, and then influence the quality of LCD.
The utility model content
In view of this, the purpose of this utility model is to provide the transformer in a kind of lamp tube driver that is applicable to LCD, make transformer when driving cold-cathode tube, the phenomenon that does not have magnetic leakage produces, allow in order to illuminate the cold-cathode tube of panel of LCD, energy stabilized illumination, and then the overall quality of raising LCD.
According to above-mentioned purpose, the utility model proposes a kind of transformer, comprise a bobbin, one first magnetic core, first and second coil and one second magnetic core.First magnetic core is arranged in the bobbin, and first and second coil then curls up around bobbin respectively.Second magnetic core covers in the bobbin outside.Wherein, form a main magnetic flux between first magnetic core and second magnetic core.
In the above-mentioned transformer of the present utility model, first magnetic core can be a rod core, and second magnetic core then can be a planar magnetic core.And, the shape approximation C font of planar magnetic core.The two ends of planar magnetic core have a depressed part respectively, and planar magnetic core is by depressed part and rod core fit.
Moreover in the above-mentioned transformer of the present utility model, first coil is a first siding ring, and second coil then is a second siding ring.Transformer can comprise that also one curls up the tertiary coil around the bobbin, and second and third coil lays respectively at the both sides of first coil, and second and third coil has roughly the same pitch of the laps number.Above-mentioned first coil is a first siding ring, and second and third coil is a second siding ring.
The utility model also comprises a kind of lamp tube driver, comprising: a transformer, and it comprises: a bobbin; One first magnetic core is arranged in this bobbin; One first and second coil curls up respectively around this bobbin, and this first coil is in order to receiving one first voltage signal, and this second coil is responded to via this first coil and this first voltage signal and produced one second voltage signal; And one second magnetic core, cover in this bobbin outside, form a main magnetic flux between this first magnetic core and this second magnetic core; And a fluorescent tube that drives by this second voltage signal, couple with this second coil.
The utility model also comprises a kind of lamp tube driver, comprising: a transformer, and it comprises: a bobbin; One first magnetic core is arranged in this bobbin; One first coil curls up around this bobbin; One second and third coil curls up around this bobbin and lays respectively at the both sides of this first coil, and this second and third coil has roughly the same pitch of the laps number; And one second magnetic core, cover in this bobbin outside, form a main magnetic flux between this first magnetic core and this second magnetic core; And first and second fluorescent tube, couple with this second and third coil respectively, this first coil is in order to receive one first voltage signal, this second and third coil via this first coil and this first voltage signal and respectively induction produces second and third voltage signal, and this first and second fluorescent tube is driven by this second and third voltage signal respectively.
Description of drawings
Figure 1A is the exploded view of traditional transformer;
Figure 1B is the constitutional diagram of traditional transformer;
Fig. 2 is the vertical view of traditional transformer 100;
Fig. 3 A is the exploded view of transformer of the present utility model;
Fig. 3 B is the constitutional diagram of transformer of the present utility model;
Fig. 4 is the front view of transformer 300 of the present utility model;
Fig. 5 is the schematic diagram of lamp tube driver of the present utility model;
Fig. 6 is the schematic diagram of the another kind of transformer of the utility model;
Fig. 7 is the schematic diagram of the another kind of lamp tube driver of the utility model.
Embodiment
The utility model is described in detail with a preferred embodiment.Yet this embodiment can't do limit to the claimed scope of the utility model.Embodiment in this article only is a kind of transformer under the utility model spirit of the present utility model.Below, earlier technical characterstic of the present utility model is described in detail.
Please be simultaneously with reference to Fig. 3 A and Fig. 3 B.What Fig. 3 A illustrated is the exploded view of transformer of the present utility model, and what Fig. 3 B illustrated is the constitutional diagram of transformer of the present utility model.Transformer 300 of the present utility model is applicable to the cold-cathode tube that drives in the LCD.Transformer 300 includes bobbin 302, first magnetic core 304, second magnetic core 306, and first and second coil (not showing among the figure).
Illustrate as Fig. 3 A, first magnetic core 304 can be a rod core, and second magnetic core 306 then can be a planar magnetic core.And, being second magnetic core 306 of planar magnetic core, its shape is approximate C font.The two ends of second magnetic core 306 have depressed part 314a, 314b respectively.The two ends of bobbin 302 dispose a plurality of metal pins 308.Metal pin 308 is in order to connecting first coil and second coil, and is soldered to circuit board.
First and second coil curls up respectively around bobbin 302.First magnetic core 304 is arranged in the bobbin 302; First magnetic core 304 can be along the arrow direction as shown in Fig. 3 A, and plant is gone into bobbin 302 and is disposed in the bobbin 302.306 of second magnetic cores cover in bobbin 302 outsides, and the second planar magnetic core 306 is by depressed part 314a, 314b and bar-shaped first magnetic core, 304 fits.Transformer 300 through combination is illustrated in Fig. 3 B.
Please refer to Fig. 4, what it illustrated is the front view of transformer 300 of the present utility model.Graphic clear for making, the bobbin 302 of transformer 300 does not give and illustrating in Fig. 4.Find out that by knowing in graphic the second planar magnetic core 306 is the outsides that cover in the first bar-shaped magnetic core 304.Can be first coil 410 of first siding ring, second coil 412 with being second siding ring curls up around bobbin respectively.That is, first coil 410 and second coil 412 are respectively around first magnetic core 304.
At first voltage signal of importing an alternation as first coil 410 of first siding ring, promptly can between first magnetic core 304 and second magnetic core 306, form main as shown in phantom in FIG. magnetic flux.And, under the effect of this magnetic flux, at second voltage signal of exporting an alternation as second coil 412 of second siding ring.That is, second coil 412 is via first coil 410 and first voltage signal, and induction produces second voltage signal.This can be in order to drive lamp luminescence at second voltage signal that secondary side produced.
Please refer to Fig. 5, what it illustrated is the schematic diagram of lamp tube driver of the present utility model.Lamp tube driver 500 of the present utility model comprises above-mentioned transformer of the present utility model 300 and fluorescent tube 516.Graphic clear in order to make, the transformer 300 among Fig. 5 only shows second coil 412 as secondary side.The fluorescent tube 516 and second coil 412 couple, and fluorescent tube 516 is driven by second voltage signal.Above-mentioned in lamp tube driver 500, fluorescent tube 516 can be a discharge lamp, and discharge lamp then can be a cold-cathode tube.
Please refer to Fig. 6, what it illustrated is the schematic diagram of the another kind of transformer of the utility model.Transformer 600 and above-mentioned transformer 300, only different on winding, all the other structures all are identical.In transformer 600, second siding ring comprises the second coil 612a and tertiary coil 612b simultaneously.The second coil 612a and tertiary coil 612b curl up around bobbin respectively.And the second coil 612a and tertiary coil 612b lay respectively at the both sides as first coil 610 of first siding ring.The second coil 612a and tertiary coil 612b have roughly the same pitch of the laps number.
Similar with transformer 300, in transformer 600,, promptly can between first magnetic core 604 and second magnetic core 606, form main as shown in phantom in FIG. magnetic flux at first voltage signal of importing an alternation as first coil 610 of first siding ring.And, under the effect of this magnetic flux,, export second voltage signal and the tertiary voltage signal of an alternation respectively at the second coil 612a, tertiary coil 612b as second siding ring.That is, second and third coil 612a, 612b are via first coil 610 and first voltage signal, and induction produces second and third voltage signal.This can be in order to drive lamp luminescence at second and third voltage signal that secondary side produced.
According to the user demand of LCD, transformer is the lamp luminescence that has higher brightness in order to driving sometimes.At this moment, fluorescent tube just needs to have higher voltage and is driven.At this moment, second coil and the tertiary coil of the second siding ring of transformer in the reverse each other mode of curling up, can be curled up around bobbin respectively.At first voltage signal of importing an alternation as first coil of first siding ring, promptly can be at second coil, tertiary coil as second siding ring, export second voltage signal and the tertiary voltage signal of a reverse alternation respectively, make second and third voltage signal stack of output, promptly can be used to drive the fluorescent tube of higher brightness.
In the mode of above-mentioned direction each other, curl up two second siding rings, and import first voltage signal at first coil as first siding ring.Learn through test, in traditional transformer 100, between an E font magnetic core 104 and the 2nd E font magnetic core 106, can form a sizable voltage difference.Therefore, the joint at an E font magnetic core 104 and the 2nd E font magnetic core 106 just must insulate with the good insulation performance material, makes the joint of an E font magnetic core 104 and the 2nd E font magnetic core 106, and the phenomenon that does not have contact discharge produces.
Yet compare with traditional transformer 100, under identical experimental condition, between first magnetic core 604 and second magnetic core 606, it is quite little that its voltage difference will seem.Therefore, between first magnetic core 604 and second magnetic core 606, produce not having the problem that must insulate.Therefore, in the manufacturing of transformer, transformer of the present utility model can be save the manufacture craft of making insulation between magnetic core, not only can reduce the cost of insulating material, also can effectively reduce the time of making transformer.
Please refer to Fig. 7, what it illustrated is the schematic diagram of the another kind of lamp tube driver of the utility model.Similar with lamp tube driver 500, lamp tube driver 700 comprises transformer 600 and fluorescent tube 716a, 716b.Similarly, graphic clear in order to make, the transformer 600 among Fig. 7 is second and third coil 612a, the 612b that only show as secondary side. Fluorescent tube 716a, 716b couple with second and third coil 612a, 612b respectively, and fluorescent tube 716a, 716b are driven by second and third voltage signal respectively.Above-mentioned in lamp tube driver 700, fluorescent tube 716a, 716b can be discharge lamps, and discharge lamp then can be a cold-cathode tube.
Simultaneously, because two second siding ring 612a, 612b use same magnetic core (first magnetic core 604), and the pitch of the laps number is identical, and cold-cathode tube is coupled to the polarity same side of second siding ring.According to Faraday's electromagnetic induction law and Lenz's law, the magnetic flux of second siding ring and flow direction are all identical, so the electric current of each cold-cathode tube of flowing through will autobalance, and do not need additionally to use balancing circuitry.
In above-mentioned the utility model embodiment, transformer 300 is only different on winding with transformer 600, in order that drive single or multiple cold-cathode tube lightings.Please refer to Fig. 4 and Fig. 6, the magnetic core of transformer 300 (or transformer 600) is by the first bar-shaped magnetic core 304 (604), and covers in the second planar magnetic core 306 (606) in first magnetic core, 304 outsides and constitute.The magnetic flux that dotted line is represented between first magnetic core 304 (604) and second magnetic core 306 (606), forms a main magnetic flux.
The setting of the second planar magnetic core 306 (606) can be set out magnetic flux by first magnetic core 304 (604), constitutes main magnetic flux along second magnetic core 306 (606).Therefore, even if there is the metal cap clamshell to be connected on the top of the lamp tube driver of LCD, main magnetic flux will be detained and be limited in second magnetic core 306 (606), and does not understand other the branch to the metal case, make transformer 300 (600) produce magnetic leakage phenomenon (fluxleakage), cause the loss of magnetic flux.So, transformer 300 of the present utility model has less load effect, and transformer 600 is except having less load effect, the function that the easy balance of tube current is arranged in addition, can make the voltage signal quite stable that second siding ring is exported, make the cold-cathode tube lighting that driven by transformer 300 (600) stable, and then can improve the quality of LCD.
Moreover, compare with traditional transformer, because transformer of the present utility model is between first magnetic core and second magnetic core, need to insulate between an E font magnetic core and the 2nd E font magnetic core unlike traditional transformer, therefore, on making, transformer of the present utility model can be saved the cost of insulating material, and the required time of transformer is made in reduction.
Claims (22)
1. a transformer is characterized in that, comprising: a bobbin (bobbin); One first magnetic core is arranged in this bobbin; One first and second coil curls up respectively around this bobbin; And one second magnetic core, cover in this bobbin outside, wherein, formation one main magnetic flux between this first magnetic core and this second magnetic core.
2. transformer as claimed in claim 1 is characterized in that, this first magnetic core is a rod core.
3. transformer as claimed in claim 1 is characterized in that, this second magnetic core is a planar magnetic core, and this planar magnetic core is to cover in this bobbin outside in the mode towards this first magnetic core.
4. transformer as claimed in claim 1 is characterized in that, the nearly C font of the shape of this second magnetic core.
5. transformer as claimed in claim 1 is characterized in that the two ends of this second magnetic core have a depressed part respectively, and this second magnetic core is by this depressed part and this first magnetic core fit.
6. transformer as claimed in claim 1 is characterized in that, this first coil is a first siding ring, and this second coil is a second siding ring.
7. transformer as claimed in claim 1, it is characterized in that, this transformer comprises that also one curls up the tertiary coil around this bobbin, and this second and third coil lays respectively at the both sides of this first coil, and this second and third coil has roughly the same pitch of the laps number.
8. transformer as claimed in claim 7 is characterized in that, this first coil is a first siding ring, and this second and third coil is a second siding ring.
9. a lamp tube driver is characterized in that, comprising: a transformer, and it comprises: a bobbin; One first magnetic core is arranged in this bobbin; One first and second coil curls up respectively around this bobbin, and this first coil is in order to receiving one first voltage signal, and this second coil is responded to via this first coil and this first voltage signal and produced one second voltage signal; And one second magnetic core, cover in this bobbin outside, form a main magnetic flux between this first magnetic core and this second magnetic core; And a fluorescent tube that drives by this second voltage signal, couple with this second coil.
10. lamp tube driver as claimed in claim 9 is characterized in that, this first magnetic core is a rod core.
11. lamp tube driver as claimed in claim 9 is characterized in that, this second magnetic core is a planar magnetic core, and this planar magnetic core is to cover in this bobbin top in the mode towards this first magnetic core.
12. lamp tube driver as claimed in claim 9 is characterized in that, the nearly C font of the shape of this second magnetic core.
13. lamp tube driver as claimed in claim 9 is characterized in that, the two ends of this second magnetic core have a depressed part respectively, and this second magnetic core is by this depressed part and this first magnetic core fit.
14. lamp tube driver as claimed in claim 9 is characterized in that, this fluorescent tube is a discharge lamp.
15. lamp tube driver as claimed in claim 14, wherein, this discharge lamp is a cold-cathode tube.
16. a lamp tube driver is characterized in that, comprising: a transformer, it comprises: a bobbin; One first magnetic core is arranged in this bobbin; One first coil curls up around this bobbin; One second and third coil curls up around this bobbin and lays respectively at the both sides of this first coil, and this second and third coil has roughly the same pitch of the laps number; And one second magnetic core, cover in this bobbin outside, form a main magnetic flux between this first magnetic core and this second magnetic core; And first and second fluorescent tube, couple with this second and third coil respectively, this first coil is in order to receive one first voltage signal, this second and third coil via this first coil and this first voltage signal and respectively induction produces second and third voltage signal, and this first and second fluorescent tube is driven by this second and third voltage signal respectively.
17. lamp tube driver as claimed in claim 16 is characterized in that, this first magnetic core is a rod core.
18. lamp tube driver as claimed in claim 16 is characterized in that, this second magnetic core is a planar magnetic core, and this planar magnetic core is to cover in this bobbin outside in the mode towards this first magnetic core.
19. lamp tube driver as claimed in claim 16 is characterized in that, the shape approximation C font of this second magnetic core.
20. lamp tube driver as claimed in claim 16 is characterized in that, the two ends of this second magnetic core have a depressed part respectively, and this second magnetic core is by this depressed part and this first magnetic core fit.
21. lamp tube driver as claimed in claim 16 is characterized in that, this fluorescent tube is a discharge lamp.
22. lamp tube driver as claimed in claim 21 is characterized in that, this discharge lamp is a cold-cathode tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420036364 CN2696093Y (en) | 2004-04-12 | 2004-04-12 | Transformer and fluorescent tube driving device using the transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420036364 CN2696093Y (en) | 2004-04-12 | 2004-04-12 | Transformer and fluorescent tube driving device using the transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2696093Y true CN2696093Y (en) | 2005-04-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420036364 Expired - Fee Related CN2696093Y (en) | 2004-04-12 | 2004-04-12 | Transformer and fluorescent tube driving device using the transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2696093Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1913738B (en) * | 2005-08-10 | 2010-12-15 | 三星电子株式会社 | Balance coil and inverter for driving backlight |
| CN102214512A (en) * | 2010-04-12 | 2011-10-12 | 陈进祥 | Voltage transformation device |
-
2004
- 2004-04-12 CN CN 200420036364 patent/CN2696093Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1913738B (en) * | 2005-08-10 | 2010-12-15 | 三星电子株式会社 | Balance coil and inverter for driving backlight |
| CN102214512A (en) * | 2010-04-12 | 2011-10-12 | 陈进祥 | Voltage transformation device |
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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: 20050427 Termination date: 20130412 |