CN1832066A - Current balance transformer and electric-discharge lamp alight apparatus using thereof - Google Patents
Current balance transformer and electric-discharge lamp alight apparatus using thereof Download PDFInfo
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- CN1832066A CN1832066A CN 200610056894 CN200610056894A CN1832066A CN 1832066 A CN1832066 A CN 1832066A CN 200610056894 CN200610056894 CN 200610056894 CN 200610056894 A CN200610056894 A CN 200610056894A CN 1832066 A CN1832066 A CN 1832066A
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Abstract
Available LCD with several lamps has several current balancing transformers resulting great installation area and high cost. For solving the problem, the present invention provides one kind of current balancing transformer, which includes one magnetic core with two magnets to form one closed magnetic circuit and four coils in the same turns wound around the magnetic core. Of the four coils, the first one and the second one in the opposite polarity are coupled magnetically, the third one and the fourth one in the opposite polarity are coupled magnetically, and there is zero magnetic coupling between the combination of the first one and the second one and the combination of the third one and the fourth one. Furthermore, one said current balancing transformer and one two-output leakage magnetic flux type invert transformer are combined to constitute one discharge lamp lightening device.
Description
Technical field
The present invention relates to structure according to the current balance transformer of the back of the body illuminator lamp device that is suitable for large-scale LCD, and the lighting apparatus for discharge lamp that the mode of the magnetic leakage flux type contravariant transformer of this current balance transformer and two output types combination is constituted.
Background technology
Follow the increase of the overall dimensions of LCD, the back of the body illuminator of this display adopts a plurality of discharge lamps.When lighting, each lamp is applied the output of the primary side of contravariant transformer, still general by a plurality of lamps and 1 contravariant transformer are made up, seek the minimizing of the usage quantity of contravariant transformer.
Figure 15 represents the structure example of this lighting circuit in the past, the primary coil of label 1 expression contravariant transformer T, label 2 expression secondary coils.2 lamps 31,32 are connected with an end of the coil 21,22 of current balance transformer 20 respectively.The other end of coil 21,22 connects jointly, and its contact is connected with the secondary coil 2 of contravariant transformer T by ballast capacitor 3.Current balance transformer 20 is opposite according to the winding direction of 2 coils 21,22, the mode magnetic coupling that the magnetic flux that is produced is offset.Consequently, the tube current that flows through corresponding lamp 31,32 is controlled by current balance transformer 20 according to the mode of equilibrium.
Patent documentation 1:JP spy opens the 2004-335443 document
Patent documentation 2:JP spy opens the 2001-126937 document
Summary of the invention
Like this, can light 2 lamps 31,32 really by 1 contravariant transformer T by current balance transformer 20 is set.And, have the advantage of the difference that can reduce the brightness between the lamp 31,32.But in the past, per 2 lamps necessarily require 1 current balance transformer 20.Thus, in adopting the LCD of using a plurality of lamps, owing to be a plurality of current balance transformers 20, so necessarily require the erection space of broad.In addition, also has the problem that cost uprises.
The invention is characterized in that this current balance transformer 40 comprises the magnetic core 50 that is formed by the magnetic with 2 closed magnetic circuits; Be wound in the 1st, the 2nd, the 3rd, the 4th coil 41,42,43,44 of the equal turn numbers on this magnetic core 50,1st, the 2nd coil 41,42 according to opposite polarity magnetic couplings, 3rd, the 4th coil 43,44 according to opposite polarity magnetic couplings, and the magnetic coupling between the 1st, the 2nd coil 41,42 and the 3rd, the 4th coil 43,44 is essentially zero.
In addition, the present invention relates to a kind of lighting apparatus for discharge lamp, it is characterized in that this lighting apparatus for discharge lamp comprises magnetic leakage flux type contravariant transformer T, this contravariant transformer T has according to the same degree of coupling and primary coil 1 and carries out magnetic-coupled the 1st, the 2nd secondary coil 2a, 2b; Above-mentioned current balance transformer 40 is at the contact P of an end of the 1st, the 2nd coil 41,42 of current balance transformer 40
1The 1st secondary coil 2a that connects contravariant transformer T is at the contact P of an end of the 3rd, the 4th coil 43,44
2The 2nd secondary coil 2b that connects contravariant transformer T, and connect different lamp 30 respectively at the other end of the 1st～the 4th coil 41,42,43,44.
In addition, the present invention relates to a kind of lighting apparatus for discharge lamp, it is characterized in that this lighting apparatus for discharge lamp comprises that the 1st, the 2nd efferent 7,8, the 1, the 2nd efferents 7,8 constitute by having the magnetic leakage flux type contravariant transformer T and the current balance transformer 40 that carry out magnetic-coupled the 1st, the 2nd secondary coil 2a, 2b according to the same degree of coupling and primary coil; The drive circuit 9 that is connected with the contravariant transformer T of the 1st, the 2nd efferent 7,8; 4 lamps 30 that have electrode at two ends, in the 1st, the 2nd efferent 7,8, the contact P of an end of the 1st secondary coil 2a of contravariant transformer T and the 1st, the 2nd coil 41,42 of current balance transformer 40
1Connect the contact P of the 2nd secondary coil 2b of contravariant transformer T and an end of the 3rd, the 4th coil 43,44
2Connect, in 4 lamps 30, electrode is connected with the other end of the 1st, the 2nd, the 3rd, the 4th coil 41,42,43,44 of the current balance transformer 40 of the 1st efferent 7 respectively, another electrode is connected with the other end of the 1st, the 2nd, the 3rd, the 4th coil 41,42,43,44 of the current balance transformer 40 of the 2nd efferent 8 respectively, and the voltage that phase place is opposite puts on the electrode at two ends.
According to the present invention, per 4 lamps adopt 1 current balance transformer to get final product, and can reduce the particularly cost of the LCD of many lamps type back of the body illuminator, and can save the space that is installed on the printed circuit substrate.In addition, respectively at the both sides of 4 lamps the occasion of current balance transformer, the required electric power of efferent, voltage decreases are set.Thus, the overall dimensions of contravariant transformer can be reduced, and fail safe can be improved.
Description of drawings
Fig. 1 is the vertical view of the 1st embodiment of expression current balance transformer of the present invention;
Fig. 2 is the front view of this transformer;
Fig. 3 is the cutaway view along the A-B line among Fig. 2;
Fig. 4 is the equivalent circuit diagram of this transformer;
Fig. 5 is the vertical view cutaway drawing of the relation of expression coil of this transformer and magnetic core;
Fig. 6 is the vertical view cutaway drawing of the 1st distortion example of the relation of expression coil and magnetic core;
Fig. 7 is the vertical view cutaway drawing of the 2nd distortion example of the relation of expression coil and magnetic core;
Fig. 8 is the vertical view cutaway drawing of the 3rd distortion example of the relation of expression coil and magnetic core;
Fig. 9 is the vertical view cutaway drawing of the 2nd embodiment of expression current balance transformer of the present invention;
Figure 10 is the vertical view of the bobbin of this transformer;
Figure 11 is the vertical view of the distortion example of expression bobbin;
Figure 12 is the circuit diagram of the 1st embodiment of expression lighting apparatus for discharge lamp;
Figure 13 is the circuit diagram of the 2nd embodiment of expression lighting apparatus for discharge lamp;
Figure 14 is the circuit diagram of the 3rd embodiment of expression lighting apparatus for discharge lamp;
Figure 15 is the circuit diagram of the existing example of expression lighting circuit.
Embodiment
Embodiment
Fig. 1～Fig. 3 represents the 1st embodiment of current balance transformer 40 of the present invention.As knowing according to Fig. 3, this current balance transformer 40 comprises the magnetic core 50 with 2 closed magnetic circuits.This magnetic core 50 is made of cross section 50a of E shape portion and line part 54, and this cross section E shape 50a of portion has 2 outer legs 51,52 and middle leg 53, and this line part 54 docks with outer leg 51,52 and middle leg 53.In addition, form the 1st closed magnetic circuit that passes through 1 outer leg 51 and middle leg 53, the 2nd closed magnetic circuit that passes through another outer leg 52 and middle leg 53.
For bobbin 70, have flange 71,72 equally at its two ends, locate to have flange 73 therebetween.Be wound with coil 43 between flange 71 at one end and the middle flange 73, between the flange 72 of the other end and middle flange 73, be wound with coil 44.Coil 43 and coil 44 are also separated the winding of turning up the soil by little flange 74 respectively.
The number of turn of each coil 41,42,43,44 is identical.Shown in the image pattern 4 like that, coil 41 and coil 42 twine in opposite direction, according to higher coupling coefficient, the magnetic couplings with opposite polarity.Equally, also according to twining in opposite direction, according to higher coupling coefficient, the mode of magnetic couplings constitutes with opposite polarity for coil 43 and coil 44.The butted part of the middle leg 53 that the magnetic shunt between leg outside 2 51,52 is used is not provided with the gap, does not produce magnetic coupling between coil 41,42 and coil 43,44.
4 coils 41,42,43,44 of this moment and the position between the magnetic core 50 concern that image pattern 5 is such.In addition, the diagram of bobbin 60,70 is omitted.Magnetic core 50 has the cross section 50a of E shape portion in fact and line part 54 gets final product, and this cross section E shape 50a of portion has 2 outer legs 51,52 and middle leg 53, and this line part 54 docks with this outer leg 51,52 and middle leg 53.Therefore, but such as also shown in the image pattern 6 like that, by 2 E shape magnetic cores butt joints are constituted magnetic cores 50.Equally in Fig. 6, adopt same label with the magnetic core 50 corresponding parts of Fig. 5.
But also image pattern 7, shown in Figure 8 changes to the installation site of 4 coils 41,42,43,44 line part 54 sides of magnetic core 50.Magnetic core 50 among Fig. 7 is the sub-assembly of E shape magnetic core and I shape magnetic core, and the magnetic core 50 of Fig. 8 is that 2 U-shaped magnetic core 5b dock the assembly that forms with I shape magnetic core 50c.The structure of these magnetic cores 50 magnetic core 50 with Fig. 5 in fact is identical.That is, have the part suitable with the cross section E shape portion that comprises 2 outer legs 51,52 and middle leg 53, the line part that docks with outer leg 51,52 and middle leg 53 54.Equally in Fig. 7 and Fig. 8, for the magnetic core 50 corresponding parts of Fig. 5, adopt same label.
Fig. 9 is the cutaway view of the 2nd embodiment of expression current balance transformer 40 of the present invention.Close the position of the structure of magnetic core 50 and 4 coils 41,42,43,44 and magnetic core 50 is the relation of Fig. 8.In bobbin 80, shown in the image pattern 10 like that, in relative side outstanding terminal 85 is installed, longitudinally have the through hole (not shown) at the center of passing.Bobbin 80 is an enantiomorphic form, has flange 81,86 in the outside, has flange 82,87 at pars intermedia, is provided with flange 83 between flange 81 and flange 82, is provided with flange 88 between flange 86 and flange 87.
Winding around 41 in the winding slot between flange 81 and flange 83, winding around 42 in the winding slot between flange 82 and flange 83.Coil 41 and coil 42 twine separatedly by little flange 84 respectively.Equally, winding around 43 in the winding slot between flange 86 and flange 88, winding around 44 in the winding slot between flange 87 and flange 88.Coil 43 and coil 44 also twine by little flange 88 respectively separatedly.In addition, from the left and right sides of bobbin 80, in the line part 54 insertion through holes with 2 magnetic core 50b, it is docked with the I shape magnetic core 50c of the pars intermedia that is arranged at bobbin 80.In addition, but bobbin 80 also shown in the image pattern 11 like that, separate at mid portion, be divided into 2 bobbin 80a, 80b.
The number of turn of each coil 41,42,43,44 is identical.Coil 41 and coil 42 twine in opposite direction, according to higher coupling coefficient, and the magnetic couplings with opposite polarity.Equally, coil 43 and coil 44 also twine in opposite direction, according to higher coupling coefficient with opposite polarity magnetic couplings.Butted part at 2 U-shaped magnetic core 50b and I shape magnetic core 50c is not provided with the gap, can not produce magnetic coupling between coil 41,42 and coil 43,44.In the current balance transformer 40 of present embodiment, 4 lead-out terminals are outstanding from the same side, so have the advantage that is connected with lamp 30 easily.
Figure 12 represents to adopt such current balance transformer 40 and the practical circuit of the lighting apparatus for discharge lamp that constitutes.Label 4 expression drive circuits, symbol T represents the contravariant transformer of magnetic leakage flux type, it has according to the same degree of coupling and primary coil 1 and carries out magnetic-coupled 2 secondary coil 2a, 2b.At an end of each coil 41～44 of current balance transformer 40, connect the lamp 30 of cold-cathode tube etc. respectively.The other end ground connection of each lamp 30.Coil 41 is connected with the other end of coil 42, its contact P
1With another distolateral connection of the secondary coil 2a of an end ground connection.Equally, coil 43 is connected with the other end of coil 44, its contact P
22b is connected with secondary coil.
Q in the drive circuit 4
1, Q
2The switching transistor that the expression push-pull type connects, symbol R represents bias resistance, symbol C represents the resonating capacitor in parallel with primary coil 1, label 6 expression feedback coils.The centre tap of primary coil 1 is connected with input terminal 5 by choke L.In addition,, the high frequency voltage of sine wave is outputed to secondary coil 2a, 2b side, light 4 discharge lamps 30 input terminal 5 impressed DC voltages.At this moment, because the magnetic flux that is produced according to coil 41 and coil 42 offsets, the mode that the magnetic flux that coil 43 and coil 44 are produced offsets realizes magnetic coupling, so by current balance transformer 40, control according to the mode that the tube current of each lamp 30 is equal.
Figure 13 represents the 2nd embodiment of lighting apparatus for discharge lamp.The efferent 7,8 that is formed by contravariant transformer T and current balance transformer 40 is arranged at the both sides of 4 lamps 30 respectively.In addition, form following scheme, wherein, apply the mode of the voltage of opposite phase, carry out Synchronization Control by drive circuit 9 according to electrode to the two ends of lamp 30.Drive circuit 9 is fit to adopt other the drive circuit of excitation formula of making IC.Efferent 7,8 constitutes according to the mode identical with the sub-assembly of the contravariant transformer T of Figure 12 and current balance transformer 40.That is, at the contact P of an end of the coil 41,42 of current balance transformer 40
1The secondary coil 2a that connects contravariant transformer T is at the contact P of an end of coil 43,44
2Connect secondary coil 2b.
In 4 lamps, a corresponding electrode is connected with the other end of coil 41,42,43,44 in the current balance transformer 40 of efferent 7 respectively, and another electrode is connected with the other end of coil 41,42,43,44 in the current balance transformer 40 of efferent 8 respectively.In addition, drive circuit 9 connects the contravariant transformer T of efferent 7,8.In the occasion of present embodiment, owing to can reduce efferent 7,8 necessary electric power and voltages, thus not only can reduce the overall dimensions of contravariant transformer T, and help dielectric voltage withstand, fail safe.In addition, also can be at contact P
1And between the ground, contact P
2And between the ground, insert capacitor respectively with the leakage inductance resonance of contravariant transformer T.
In the embodiment of Figure 13,2 outputs of contravariant transformer T put on the current balance transformer 40 according to same phase, still, but also shown in the image pattern 14 like that, make these 2 to be output as opposite phases.That is the contact P of an end of the coil in the current balance transformer 40 of efferent 7,8 41,42,
1, with the contact P of an end of coil 43,44
2On apply the opposite voltage of phase place.In the structure of Figure 14,2 lamp 30a, 30b of top and 2 lamp 30c, 30d of below drive according to opposite phases, the difference when suppressing to light effectively.
Claims (7)
1. a current balance transformer is characterized in that this current balance transformer comprises the magnetic core that is formed by the magnetic with 2 closed magnetic circuits; Be wound in the 1st, the 2nd, the 3rd, the 4th coil of the equal turn numbers on this magnetic core, 1st, the 2nd coil according to opposite polarity magnetic couplings, 3rd, the 4th coil according to opposite polarity magnetic couplings, and the magnetic coupling between the 1st, the 2nd coil and the 3rd, the 4th coil is essentially zero.
2. current balance transformer according to claim 1 is characterized in that magnetic core comprises the cross section E shape portion with middle leg and 2 outer legs in fact; The line part that docks with above-mentioned middle leg and outer leg.
3. current balance transformer according to claim 2, it is characterized in that it comprises the 1st, the 2nd bobbin with flange, the 1st bobbin that is wound with the 1st, the 2nd coil is installed on the outer leg, the 2nd bobbin that is wound with the 3rd, the 4th coil is installed on another outer leg, and by the flange of bobbin, the mode than the length direction adjacency of the outer leg in edge is provided with according to respectively for the 1st coil and the 2nd coil, the 3rd coil and the 4th coil.
4. current balance transformer according to claim 2, it is characterized in that it comprises bobbin, this bobbin has a plurality of winding slots of separating by flange, 1st, the 2nd, the 3rd, the 4th coil is wound in respectively in the different winding slot of this bobbin, and this bobbin is installed on the line part of magnetic core, the 1st, the 2nd, the 3rd, the 4th coil along line part than the length direction setting.
5. a lighting apparatus for discharge lamp is characterized in that this lighting apparatus for discharge lamp comprises magnetic leakage flux type contravariant transformer, and this contravariant transformer has according to the same degree of coupling and primary coil and carries out magnetic-coupled the 1st, the 2nd secondary coil; The described current balance transformer of claim 1, the 1st secondary coil that connects contravariant transformer at the contact of an end of the 1st, the 2nd coil of current balance transformer, connect the 2nd secondary coil of contravariant transformer at the contact of an end of the 3rd, the 4th coil, and connect different lamps respectively at the other end of the 1st～the 4th coil.
6. lighting apparatus for discharge lamp is characterized in that this lighting apparatus for discharge lamp comprises:
1st, the 2nd efferent, the 1st, the 2nd efferent constitutes by having the magnetic leakage flux type contravariant transformer and the described current balance transformer of claim 1 that carry out magnetic-coupled the 1st, the 2nd secondary coil according to the same degree of coupling and primary coil;
The drive circuit that is connected with the contravariant transformer of the 1st, the 2nd efferent;
4 lamps that have electrode at two ends;
In the 1st, the 2nd efferent, the 1st secondary coil of contravariant transformer is connected with the contact of an end of the 1st, the 2nd coil of current balance transformer, and the contact of the 2nd secondary coil and the 3rd of contravariant transformer, an end of the 4th coil is connected;
In 4 lamps, electrode is connected with the other end of the 1st, the 2nd, the 3rd, the 4th coil of the current balance transformer of the 1st efferent respectively, another electrode is connected with the other end of the 1st, the 2nd, the 3rd, the 4th coil of the current balance transformer of the 2nd efferent respectively, and the voltage that phase place is opposite puts on the electrode at two ends.
7. lighting apparatus for discharge lamp according to claim 6 is characterized in that applying the opposite voltage of phase place on the contact of an end of contact, the 3rd, the 4th coil at an end of the 1st, the 2nd coil of the current balance transformer of the 1st, the 2nd efferent.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005068594 | 2005-03-11 | ||
| JP2005068594 | 2005-03-11 | ||
| JP2005286665 | 2005-09-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1832066A true CN1832066A (en) | 2006-09-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610056894 Pending CN1832066A (en) | 2005-03-11 | 2006-03-09 | Current balance transformer and electric-discharge lamp alight apparatus using thereof |
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| CN (1) | CN1832066A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101399114B (en) * | 2007-09-28 | 2011-07-27 | 王奉瑾 | Multiple magnetic circuit transformer |
| CN101996741B (en) * | 2009-08-20 | 2012-07-25 | 上海康顺磁性元件厂有限公司 | Transformer CI magnetic core for multi-specification liquid crystal display |
| CN101996742B (en) * | 2009-08-20 | 2012-08-22 | 上海康顺磁性元件厂有限公司 | Surface-mounted transformer magnetic core for liquid crystal display |
| CN105742038A (en) * | 2014-12-26 | 2016-07-06 | Sht有限公司 | Common mode choke coil |
-
2006
- 2006-03-09 CN CN 200610056894 patent/CN1832066A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101399114B (en) * | 2007-09-28 | 2011-07-27 | 王奉瑾 | Multiple magnetic circuit transformer |
| CN101996741B (en) * | 2009-08-20 | 2012-07-25 | 上海康顺磁性元件厂有限公司 | Transformer CI magnetic core for multi-specification liquid crystal display |
| CN101996742B (en) * | 2009-08-20 | 2012-08-22 | 上海康顺磁性元件厂有限公司 | Surface-mounted transformer magnetic core for liquid crystal display |
| CN105742038A (en) * | 2014-12-26 | 2016-07-06 | Sht有限公司 | Common mode choke coil |
| CN105742038B (en) * | 2014-12-26 | 2019-01-22 | Sht有限公司 | Common mode choke coil |
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Legal Events
| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| CI02 | Correction of invention patent application |
Correction item: Priority Correct: 2005.09.30 JP 2005-286665 False: Lack of priority second Number: 37 Page: The title page Volume: 22 |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: PRIORITY; FROM: MISSING THE SECOND ARTICLE OF PRIORITY TO: 2005.9.30 JP 2005-286665 |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |