CN2805041Y - Transformer, and circuit for driving discharge lamp tube therewith - Google Patents
Transformer, and circuit for driving discharge lamp tube therewith Download PDFInfo
- Publication number
- CN2805041Y CN2805041Y CN 200520016323 CN200520016323U CN2805041Y CN 2805041 Y CN2805041 Y CN 2805041Y CN 200520016323 CN200520016323 CN 200520016323 CN 200520016323 U CN200520016323 U CN 200520016323U CN 2805041 Y CN2805041 Y CN 2805041Y
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- magnetic core
- drum stand
- coiling group
- side coiling
- secondary side
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Abstract
The utility model discloses a transformer, which comprises a first bobbin bracket, a second bobbin bracket, a primary side winding, a secondary side winding, a first magnetic core, a second magnetic core and a third magnetic core, wherein the first bobbin bracket has a first through hole. The second bobbin bracket is arranged closely to the first bobbin bracket, and has a second through hole. The primary side winding is wound on the primary bobbin bracket; the secondary side winding is wound at one side of the second bobbin bracket. The first magnetic core is arranged in the first bobbin bracket in an embedded mode; the second magnetic core is arranged in the second bobbin bracket in the embedded mode. The third magnetic core is coupled with the first magnetic core and the second magnetic core; one part of the third magnetic core is positioned between the primary side winding and the secondary side winding.
Description
Technical field
The utility model relates to a kind of transformer, particularly relates to a kind of magnetic core that utilizes and makes it between primary side coiling group and secondary side coiling group, to increase the magnetic flux and the leakage inductance of transformer.
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 to use the light and handy lamp source that reaches dynamical discharge lamp as backlight module, therefore has thin thickness, the steady and audible characteristics of image quality.Backlight module 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 refer to Fig. 1, it illustrates the decomposing schematic representation of traditional transformer.Transformer 100 has drum stand 101, first magnetic core 103, second magnetic core 105, primary side coiling group 107 and secondary side coiling group 109.Behind transformer 100 logical upward electric currents, magnetic flux flow to other end 105b along an end 105a of second magnetic core 105.And flow into by other end 105b magnetic flux and to get back to second magnetic core 105 shown in the arrow direction by an end of first magnetic core 103.
Yet; regular meeting produces stray-capacity effect between the casing of cold-cathode tube and LCD at present; and this stray-capacity effect can cause in the LCD difference of electric current between different cold-cathode tubes; and then the stability that influences electric current when the size of current that flow through each cold-cathode tube not simultaneously; each cold-cathode tube will produce different brightness, and make brightness of backlight module inhomogeneous.And will reduce the useful life of bright excessively cold-cathode tube.And in order to obtain the stability of electric current, manufacturer need dispose many high-voltage capacitances by each cold-cathode tube, to reduce the influence of stray capacitance, reduces the difference of electric current between different cold-cathode tubes.Yet it is quite high using the required cost of a plurality of high-voltage capacitances.
The utility model content
In view of this, the purpose of this utility model is to provide a kind of transformer, utilize to increase the mode of magnetic flux and leakage inductance, reduce or even replace and need dispose high-voltage capacitance in the past in lamp tube drive circuit, with the stability of Control current, and be applied to bigger frequency application scope.
According to the purpose of this utility model, a kind of transformer is provided, comprising: first drum stand, second drum stand, primary side coiling group, secondary side coiling group, first magnetic core, second magnetic core and the 3rd magnetic core.First drum stand has one first through hole, and the second drum stand disposed adjacent is in first drum stand, and second drum stand has second through hole.Primary side coiling group is curled up in first drum stand, and secondary side coiling group is curled up the side in second drum stand.First magnetic core is embedded to be disposed in first drum stand, second magnetic core is embedded in second drum stand, and couple with this first magnetic core, the 3rd magnetic core has a first and second portion, and couple with this first magnetic core and second magnetic core respectively, this first and second portion are between this primary side coiling group and this secondary side coiling group, and at a distance of one first distance.
Another purpose of the present utility model is to provide a kind of transformer, comprise: one first drum stand, one second drum stand, one primary side coiling group, one secondary side coiling group, one first magnetic core, one second magnetic core, one first connecting portion, one second connecting portion, first drum stand has one first through hole, second drum stand, disposed adjacent is in first drum stand, second drum stand has one second through hole, primary side coiling group is curled up in first drum stand, secondary side coiling group is curled up in second drum stand, first magnetic core embeds in first drum stand, have a first and a second portion, second magnetic core embeds second drum stand, have third part and one the 4th part, first connecting portion couples first and third part, second connecting portion couples second portion and the 4th part, the 3rd magnetic core is between primary side coiling group and secondary side coiling group, and the 3rd magnetic core has one first end and second end, first end and second end respectively with first connecting portion and second connecting portion at a distance of one first distance and second distance.
Another purpose of the present utility model is to provide a kind of multiple lamp tube drive circuit, and above-mentioned transformer is coupled a discharge lamp or a plurality of discharge lamp.
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below:
Description of drawings
Fig. 1 is the traditional transformer decomposing schematic representation;
Fig. 2 A is the stereogram of the transformer of the utility model one first embodiment;
Fig. 2 B is two E font magnetic core schematic diagrames;
Fig. 3 is the stereogram of the transformer of the utility model second embodiment;
Fig. 4 is the stereogram of the transformer of the utility model the 3rd embodiment;
Fig. 5 is the stereogram of the transformer of the utility model the 4th embodiment;
Fig. 6 is the schematic diagram of the transformer of the utility model the 5th embodiment;
Fig. 7 is the multiple lamp tube drive circuit figure of the utility model the 6th embodiment.
Embodiment
First embodiment
Please be simultaneously with reference to Fig. 2 A and Fig. 2 B, Fig. 2 A illustrates the stereogram according to the transformer of the utility model first embodiment.Fig. 2 B figure illustrates two E font magnetic core schematic diagrames.Transformer 200 comprises: first drum stand 201, second drum stand 203, primary side coiling group 205, secondary side coiling group 207, first magnetic core 209, second magnetic core 211 and the 3rd magnetic core 213.First drum stand 201 has first through hole, 215, the second drum stands, 203 disposed adjacent in first drum stand 201 and have second through hole 217.Has connecting portion 219 at first magnetic core 209 and 211 of second magnetic cores, first magnetic core 209 comprises 209a of first and second portion 209b, second magnetic core 211 comprises third part 211a and the 4th part 211b, and the 3rd magnetic core 213 comprises the 5th part 213a and the 6th part 213b.And connecting portion 219 comprises the first connecting portion 219a and the second connecting portion 219b.The first connecting portion 219a is in order to connect 209a of first and third part 211a to constitute one first Contraband font magnetic core.The second connecting portion 219b is in order to connect second portion 209b and the 4th part 211b to constitute one second Contraband font magnetic core.Primary side coiling group 205 is curled up in first drum stand 201, and secondary side coiling group comprises first secondary side coiling, the 207 and second secondary side coiling group 207 ', curl up respectively on second drum stand 203, and interval one set distance X.First magnetic core 209 is embedded in first drum stand 201, and second magnetic core 211 is embedded in second drum stand 203, and the 3rd magnetic core 213 is disposed between primary side coiling group 205 and the secondary side coiling group 207.The 3rd magnetic core 213 has the 5th part 213a and the 6th part 213b, couples with first magnetic core 209 and second magnetic core 211 respectively, has first between the 5th part 213a and the 6th part 213b apart from d1 (shown in Fig. 2 B).209a of first and second portion 209b have a second distance d2, and third part 211a and the 4th part 211b have one the 3rd apart from d3.Generally speaking, first apart from d1, second distance d2 and the 3rd apart from d3 about equally, and its value is roughly 0.5mm.In addition, the 209a of first, third part 211a and the 5th part 213a can make in one-body molded mode becomes an E font magnetic core, or sticks together into E font magnetic core with fixing glue respectively.In like manner, second portion 209b, the 4th part 211b and the 6th part 213b can be made into E font magnetic core in one-body molded mode, or stick together into E font magnetic core with fixing glue respectively.
When the coiling of electric current inflow primary side organized 205, secondary side coiling group 207 produced an induced current.Primary side coiling group 205 can produce magnetic flux on the path that electric current is flowed through simultaneously, and the magnetic line of force that magnetic flux constituted is shown in Fig. 2 B.The magnetic line of force extends to second portion 209b by the 209a of first, and extend to third part 211a constituting the first magnetic circuit A1 by the 4th part 211b, and this magnetic flux by 207 of primary side coiling group 205 and secondary side coiling groups the magnetic flux (magnetic flux A1) of generation major part.In Fig. 2 B, except the first magnetic circuit A1 also comprises the second magnetic circuit B1 and the 3rd magnetic circuit C1.The second magnetic circuit B1 is the part magnetic flux (magnetic flux B1) of primary side coiling group 205.And the 3rd magnetic circuit C1 is meant the part magnetic flux (magnetic flux C1) that secondary side coiling group 207 produces.Therefore, total magnetic flux is by A1+B1+C1.Utilize the 3rd magnetic core to be arranged between primary side coiling group 205 and the secondary side coiling group 207 to destroy the mutual inductance between primary side coiling group 205 and the secondary side coiling group 207, to increase total magnetic flux and leakage inductance.The material of first magnetic core 209 and second magnetic core 211 is generally the MnZn material, and the 3rd magnetic core 213 can be MnZn material or nickel zinc material, when using nickel zinc material, has preferable resistance (greater than 1M nurse difficult to understand), can avoid the high voltage flash problem.
Second embodiment
Please refer to the 3rd figure, it illustrates the stereogram according to the transformer 300 of the utility model second embodiment.Be different from first embodiment, in a second embodiment, the 309a of first and the second portion 309b of first magnetic core 319 combine between the higher and lower levels with complimentary fashion, in like manner, the 311a of first and the second portion 311b of second magnetic core combine between the higher and lower levels with complimentary fashion, and the 309a of first of the 3rd magnetic core and second portion 309b combine between the higher and lower levels and have a gap (not shown) with complimentary fashion.The 3rd magnetic core 313a, 313b are positioned between primary side coiling group 305 and secondary side coiling group 307 and 307 ', in order to increase the total magnetic flux and the leakage inductance of transformer.The increase magnetic flux of this embodiment and the principle of leakage inductance are identical with first embodiment, repeat no more in this embodiment.
The 3rd embodiment
Please refer to Fig. 4, it illustrates the stereogram according to the transformer 400 of the utility model the 3rd embodiment.Be different from first embodiment and second embodiment, in the 3rd embodiment, the 3rd magnetic core 413 is planar king's font magnetic core, and that first magnetic core 409 and second magnetic core 411 are respectively an I font magnetic core is in the same plane.The 3rd magnetic core has the one first end 413a and the second end 413b, and has one first apart from a d1 (not shown) and a second distance d2 (not shown) with first magnetic core 409 and second magnetic core 411 respectively.The 3rd magnetic core 413 is positioned between primary side coiling group 405 and secondary side coiling group 407 and 407 ', in order to increase the total magnetic flux and the leakage inductance of transformer 400.The material of first magnetic core 409 and second magnetic core 411 is generally the MnZn material, and the 3rd magnetic core 413 can be MnZn material or nickel zinc material, has preferable resistance (greater than 1M nurse difficult to understand) when using nickel zinc material, can avoid the high voltage flash problem.The increase magnetic flux of this embodiment and the principle of leakage inductance are identical with first embodiment, repeat no more in this embodiment.
The 4th embodiment
Please refer to Fig. 5, it illustrates the stereogram according to the transformer 500 of the utility model the 4th embodiment.Be different from the foregoing description, in the 4th embodiment, first magnetic core 509, second magnetic core 511 form the magnetic core of two Contraband fonts respectively with connecting portion 519a and 519b.As for the 3rd magnetic core 513, for planar magnetic core and its section are the E font.The 3rd magnetic core (planar magnetic core) 513 is set up on the two Contraband font magnetic cores.The 3rd magnetic core 513 has a protuberance 5131, and protuberance 5131 has one first end 5131a and one second end 5131b, and respectively and have one first between the first connecting portion 519a and the second connecting portion 519b apart from d1 (not shown) and second distance d2 (not shown).
The 5th embodiment
Please refer to the 6th figure, it illustrates the schematic diagram according to the transformer 600 of the utility model the 5th embodiment, be different from the 4th and state embodiment, in the 5th embodiment, the 3rd magnetic core 613, it is an I font magnetic core, have one first end 613a and one second end 613b, the 3rd magnetic core 613 is positioned between primary side coiling group 605 and secondary side coiling group 607 and 607 ', and the first end 613a and the second end 613b have one first apart from d1 and second distance d2 respectively and between the first connecting portion 619a and the second connecting portion 619b, generally speaking, first is roughly the same apart from d1 and second distance d2, and its value is about 0.1mm.The material of the 3rd magnetic core can be nickel zinc material.
The 6th embodiment
Please refer to Fig. 7, it illustrates the lamp tube drive circuit 700 of the utility model the 6th embodiment, and lamp tube drive circuit 700 comprises above-mentioned first and the transformer (200,600) of the 5th embodiment, the first fluorescent tube L1, the second fluorescent tube L2, and drive unit 701.Primary side coiling group (205,605) couples a drive unit 701, the first fluorescent tube L1 and couples the first secondary side coiling group (207,607), and the second fluorescent tube L2 couples the second primary side coiling group (207 ', 607 ').Utilize above-mentioned first and the multiple lamp tube drive circuit that transformer constituted 700 of the 5th embodiment have higher leakage inductance, the drive circuit 700 that can cooperate high leakage inductance to require, and can reduce the required high-voltage capacitance of prior art.The fluorescent tube L1 and the second fluorescent tube L2 are discharge lamp, and discharge lamp can be cold-cathode tube (CCFL).Because the first secondary side coiling group (207,607) has identical magnetic flux with the second secondary side coiling group (207 ', 607 '), according to electromagnetic principle, the electric current of the flow through first fluorescent tube L1 and the second fluorescent tube L2 is with autobalance.Though this embodiment is an example with two fluorescent tubes, also can be applicable to single fluorescent tube.
Claims (16)
1. a transformer is characterized in that, comprising: one first drum stand has one first through hole; One second drum stand, disposed adjacent are in this first drum stand, and this second drum stand has one second through hole; One primary side coiling group is curled up in this first drum stand; One first secondary side coiling group is curled up in this second drum stand; One first magnetic core embeds in this first drum stand; One second magnetic core embeds in this second drum stand, and couples with this first magnetic core; And one the 3rd magnetic core, have a first and second portion, and couple with this first magnetic core and second magnetic core respectively; Wherein, this first and second portion are between this primary side coiling group and this secondary side coiling group, and at a distance of one first distance.
2. transformer as claimed in claim 1 is characterized in that, also comprises a junction, and this connecting portion is in order to couple this first magnetic core, second magnetic core and the 3rd magnetic core.
3. transformer as claimed in claim 2 is characterized in that, this first magnetic core comprises a third part and one the 4th part; This second magnetic core comprises one the 5th part and the 6th part; This connecting portion comprises one first connecting portion and one second connecting portion, and wherein this first, third part, the 5th part and this first connecting portion constitute one the one E font magnetic core; This second portion, the 4th part, the 6th part and this second connecting portion constitute one the 2nd E font magnetic core.
4. transformer as claimed in claim 3 is characterized in that, an E font magnetic core and the 2nd E font magnetic core are positioned at same plane.
5. transformer as claimed in claim 3 is characterized in that, an E font magnetic core and the 2nd E font magnetic core are to combine between the higher and lower levels with complimentary fashion.
6. transformer as claimed in claim 1 is characterized in that, also comprises one second secondary side coiling group, curls up in this second drum stand, has a both set a distance between this second secondary side coiling group and this first secondary side coiling group.
7. a transformer is characterized in that, comprising: one first drum stand has one first through hole; One second drum stand, disposed adjacent are in this first drum stand, and this second drum stand has one second through hole; One primary side coiling group is curled up in this first drum stand; One first secondary side coiling group is curled up in this second drum stand; One first magnetic core has a first and second portion, embeds in this first drum stand; One second magnetic core has a third part and the 4th part, embeds in this second drum stand; One first connecting portion couples this first and third part; One second connecting portion couples this second portion and the 4th part; And one the 3rd magnetic core, have one first end and second end, and respectively and have one first distance and second distance between this first connecting portion and second connecting portion; Wherein, the 3rd magnetic core is between this primary side coiling group and this secondary side coiling group.
8. transformer as claimed in claim 7 is characterized in that, the material of the 3rd magnetic core is nickel zinc or MnZn.
9. transformer as claimed in claim 7 is characterized in that, the 3rd magnetic core is king's font magnetic core, and this first magnetic core and second magnetic core are I font magnetic core.
10. transformer as claimed in claim 7 is characterized in that, the 3rd magnetic core is a planar magnetic core, and has a protuberance, and this protuberance is between this primary side coiling group and this secondary side coiling group.
11. transformer as claimed in claim 10 is characterized in that, the section of the 3rd magnetic core is the E font.
12. transformer as claimed in claim 7 is characterized in that, also comprises one second secondary side coiling group, curl up in this second drum stand, and with this first primary side coiling group at a distance of a both set a distance.
13. a lamp tube drive circuit is characterized in that, comprising: a drive unit; One first drum stand has one first through hole; One second drum stand, disposed adjacent are in this first drum stand, and this second drum stand has one second through hole; One primary side coiling group is curled up in this first drum stand, couples this drive unit; One first secondary side coiling group is curled up in this second drum stand; One fluorescent tube couples this first secondary side coiling group; One first magnetic core embeds in this first drum stand; One second magnetic core embeds in this second drum stand, and couples with this first magnetic core; And one the 3rd magnetic core, have a first and second portion, and couple with this first magnetic core and second magnetic core respectively; Wherein, this first and second portion are between this primary side coiling group and this secondary side coiling group, and at a distance of one first distance.
14. lamp tube drive circuit as claimed in claim 13 is characterized in that, also comprises one second secondary side coiling group and one second fluorescent tube, the second secondary side coiling group is curled up in this second drum stand, and couples this second fluorescent tube.
15. a multiple lamp tube drive circuit is characterized in that, comprising: a drive unit; One first drum stand has one first through hole; One second drum stand, disposed adjacent are in this first drum stand, and this second drum stand has one second through hole; One primary side coiling group is curled up in this first drum stand, couples this drive unit; One first secondary side coiling group is curled up in this second drum stand; One first fluorescent tube couples this first secondary side coiling group; One first magnetic core has a first and second portion, embeds in this first drum stand; One second magnetic core has a third part and the 4th part, embeds in this second drum stand; One first connecting portion couples this first and third part; One second connecting portion couples this second portion and the 4th part; And one the 3rd magnetic core, have one first end and second end, and respectively and have one first distance and second distance between this first connecting portion and second connecting portion; Wherein, the 3rd magnetic core is between this primary side coiling group and this secondary side coiling group.
16. lamp tube drive circuit as claimed in claim 15 is characterized in that, also comprises one second secondary side coiling group and one second fluorescent tube, this second secondary side coiling group is curled up in this second drum stand, and couples this second fluorescent tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520016323 CN2805041Y (en) | 2005-04-08 | 2005-04-08 | Transformer, and circuit for driving discharge lamp tube therewith |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520016323 CN2805041Y (en) | 2005-04-08 | 2005-04-08 | Transformer, and circuit for driving discharge lamp tube therewith |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2805041Y true CN2805041Y (en) | 2006-08-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520016323 Expired - Fee Related CN2805041Y (en) | 2005-04-08 | 2005-04-08 | Transformer, and circuit for driving discharge lamp tube therewith |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2805041Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106373734A (en) * | 2016-11-11 | 2017-02-01 | 深圳市莱福德光电有限公司 | High -frequency transformer |
-
2005
- 2005-04-08 CN CN 200520016323 patent/CN2805041Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106373734A (en) * | 2016-11-11 | 2017-02-01 | 深圳市莱福德光电有限公司 | High -frequency transformer |
| CN106373734B (en) * | 2016-11-11 | 2018-05-08 | 深圳莱福德科技股份有限公司 | High frequency transformer |
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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: 20060809 Termination date: 20130408 |