WO2006059630A1 - インバータトランス - Google Patents
インバータトランス Download PDFInfo
- Publication number
- WO2006059630A1 WO2006059630A1 PCT/JP2005/021966 JP2005021966W WO2006059630A1 WO 2006059630 A1 WO2006059630 A1 WO 2006059630A1 JP 2005021966 W JP2005021966 W JP 2005021966W WO 2006059630 A1 WO2006059630 A1 WO 2006059630A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- shaped core
- winding
- rod
- core
- bobbin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
- H01F27/326—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures specifically adapted for discharge lamp ballasts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/08—High-leakage transformers or inductances
- H01F38/10—Ballasts, e.g. for discharge lamps
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters
- H05B41/282—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices
- H05B41/2821—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices by means of a single-switch converter or a parallel push-pull converter in the final stage
- H05B41/2822—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices by means of a single-switch converter or a parallel push-pull converter in the final stage using specially adapted components in the load circuit, e.g. feed-back transformers, piezoelectric transformers; using specially adapted load circuit configurations
Definitions
- the present invention relates to a two-output type inverter transformer having a primary winding portion located in the center and secondary winding portions located on both sides thereof. More specifically, the present invention relates to a bar-shaped core constituting a magnetic path.
- the present invention relates to an inverter transformer in which the variation in the inductance of the secondary winding is reduced by devising the dimensions and positional relationship between the core and the rectangular frame core. This inverter transformer is useful, for example, for a backlight of a liquid crystal display device.
- a plurality of cold-cathode tubes are used for knock lights such as liquid crystal televisions and liquid crystal display devices.
- 16 cold-cathode tubes are placed on the back of the LCD panel at an appropriate interval to maintain the brightness of the entire screen. It is necessary to keep the lamp current of each cold-cathode tube constant in order to suppress unevenness in brightness of each cold-cathode tube and achieve uniform illumination when multiple cold-cathode tubes are lit. is there.
- one cold-cathode tube is driven independently by a single transformer, it is easy to suppress variations in luminance, but the drive circuit becomes complicated and inefficient. Therefore, a configuration has been proposed in which two cold-cathode tubes are driven by one transformer to reduce the number of parts of the entire inverter circuit, thereby reducing the size and cost.
- a backlight transformer having two outputs on the secondary side of a high-voltage transformer is described in, for example, Japanese Utility Model Laid-Open No. 7-22528.
- the inverter transformer and the drive circuit are united, and unitized cold cathode tube lighting circuits are repeatedly developed according to the size of the liquid crystal panel (in other words, the number of cold cathode tube arrays).
- Liquid crystal panels are manufactured by installing them on the back and side surfaces and performing necessary wiring with each cold cathode tube.
- Liquid crystal televisions and liquid crystal display devices have been developed to have high brightness screens, and as a result, luminance variations among multiple cold-cathode tubes have become a major problem.
- the power of inductance deviation in the two secondary power lines (output power lines) causes variations in lamp current. It is necessary to suppress the variation in ductance.
- the bobbin, the core, the gap sheet, etc. are made symmetrical on both sides with respect to the center to reduce the inductance deviation between the two secondary windings. ing.
- the gap between the two C-shaped cores and the I-shaped cores must be fixed to meet the gap due to assembly problems and dimensional tolerances between the C-shaped core and the I-shaped core. A difference occurs, and the inductance deviation between the two secondary wires cannot be reduced sufficiently.
- the problem to be solved by the present invention is that in a two-output type inverter transformer, variations in secondary winding inductance and leakage inductance are reduced, and unevenness in luminance is generated by making the lamp current uniform. Is to prevent. Moreover, in many inverter transformers, the variation in inductance of each secondary winding that may occur during mass production is suppressed as much as possible.
- An inverter transformer includes a winding shaft, end blocks respectively provided at both ends of the winding shaft, and two spaces provided at an intermediate portion of the winding shaft.
- An intermediate block a primary winding formed between the two intermediate blocks in the center, and an intermediate block formed between the intermediate block and the end block on both sides of the primary winding.
- a bobbin provided with a secondary winding portion having the same winding structure, and inserted into the winding shaft.
- a two-output type inverter transformer each having a gap sheet of the same thickness interposed between the rectangular cores and having a length along the winding axis of the rectangular frame cores Is L1, L2 is the length of the rod-shaped core, and t is the thickness of the gap sheet, Ll, L2, and t are set so as to satisfy the formula L2—Ll> 2t
- the rod-shaped core has a rectangular frame shape. They are combined so as to protrude evenly from both end faces of the core.
- the bobbin is provided with an insulating flange portion on the inner side facing the secondary winding portion of the end block, the intermediate block itself has a flange function, and the secondary winding portions are respectively provided.
- a plurality of sub-flanges are arranged, and the terminal to which the wire terminal is connected is fixed to two or more blocks, and is integrally formed with an electrically insulating grease. Let's make it.
- the insulating tape is wound around the primary winding portion with the winding, and the bobbin and the quadrangular frame core are thereby temporarily fixed in a positioned state.
- the rod-shaped core and the square frame-shaped core can be combined easily and accurately.
- the top surface is smoothed by the insulating tape, it can be used as a suction surface during product mounting.
- Any one or more blocks (end block and Z or intermediate block) of the bobbin have a secondary winding bow I groove, or a protrusion to secure a path through which the primary winding passes. It is good to form. In this way, the position of the winding is determined and winding disturbance can be prevented, so that the variation in inductance of the secondary winding can be further reduced.
- the length of the rod-shaped core is more than twice the thickness of the gap sheet, and the length of the rod-shaped core is longer than the length along the winding axis of the rectangular frame-shaped core.
- FIG. 1A is a plan view of an inverter transformer used for simulation.
- FIG. 1B is another plan view of the inverter transformer used in the simulation.
- FIG. 1C is a cross-sectional view of the inverter transformer used in the simulation of FIG. 1A.
- FIG. 1D is a cross-sectional view of the inverter transformer used in the simulation of FIG. 1B.
- FIG. 2 is an explanatory diagram of a rod-shaped core and a rectangular frame-shaped core.
- FIG. 3 is a graph showing simulation results.
- FIG. 4A is a plan view showing an embodiment of an inverter transformer according to the present invention.
- FIG. 4B is a side view showing one embodiment of the inverter transformer according to the present invention.
- FIG. 4C is a front view showing one embodiment of the inverter transformer according to the present invention.
- FIG. 5A is a front view of a bobbin used in the inverter transformer according to the present invention.
- FIG. 5B is a side view of the bobbin used in the inverter transformer according to the present invention.
- FIG. 5C is a front view of a bobbin used in the inverter transformer according to the present invention.
- FIG. 5D is a bottom view of the bobbin used in the inverter transformer according to the present invention. Explanation of symbols
- two end blocks are provided at both ends of the winding shaft and two intermediate blocks are provided at an intermediate portion, respectively.
- a bobbin in which a secondary winding portion having the same winding structure is formed between the intermediate portion and the end block on both sides thereof, a rod-shaped core inserted into the winding shaft, and the rod-shaped core And a rectangular frame core disposed so as to surround the outer periphery of the primary winding portion and the secondary winding portion, and the rod core and the square frame core at both ends of the bobbin. It is the structure which opposes through the gap sheet of the same thickness.
- the present inventors have found that the length L2 of the rod-shaped core protrudes more than a certain dimension from the length L1 of the rectangular frame-shaped core.
- the rate of change in inductance with respect to the amount of protrusion ie, the slope
- variations in inductance can be greatly reduced with respect to variations in core dimensions and relative misalignment.
- Figure 1 shows the configuration of the inverter transformer used in the simulation.
- 1A and 1B are plan views
- FIG. 1C is a cross section
- FIG. 1D is a side view.
- Fig. 2 shows the core shape.
- a primary winding 12 is installed at the center of the bobbin 10 winding axis, and secondary windings 14 having the same winding structure are installed on both sides thereof.
- the rod-shaped core 16 is inserted into the winding shaft, and the rectangular frame-shaped core 18 is disposed so as to surround the outer periphery of the primary winding 12 and the two secondary windings 14.
- the rod-shaped core 16 and the rectangular frame-shaped core 18 are combined so as to face each other via a gap sheet 20 (see FIG. 2) having the same thickness at both ends, thereby forming a two-output type inverter transformer.
- the length of the rectangular frame core along the winding axis is L1 (constant)
- the length of the rod-shaped core is L2 (variable)
- the thickness of the gap sheet is t (constant).
- Inductance of quantity and secondary winding Sought the relationship of In other words, the length L2 of the rod-shaped core was changed from the state in which the rod-shaped core was retracted from the square frame-shaped core (Fig. 1A) to the state in which the rod-shaped core also protruded the square frame-shaped core force (Fig. 1B). .
- Rod core Width 5.70mm, Height 3.20mm, Length L2 is variable
- Gap sheet 0.15mm thickness
- the inductance with respect to the protruding amount of the rod-shaped core is basically the case where the force rod-shaped core having a linear relationship is drawn (in other words, protruding in one direction)
- the slope of the straight line is different between the case where the rod-shaped core protrudes (ie, the state of FIG.
- the thickness of the gap sheet is usually about 0.10 to 0.20 mm in this type of inverter transformer. The amount of protrusion of the rod-shaped core is determined as a low price.
- FIG. 4 is an explanatory view showing an embodiment of the inverter transformer according to the present invention, in which FIG. 4A shows a plan view, FIG. 4B shows a side view, and FIG. 4C shows a front view.
- FIG. 5 is an explanatory view of the bobbin.
- FIG. 5A shows a plane
- FIG. 5B shows a side
- FIG. 5C shows a front
- FIG. 5D shows a bottom.
- the bobbin 30 is provided with end blocks 34 at both ends of one winding shaft 32 and two intermediate blocks 36 at intervals in the middle portion.
- a primary winding is installed between the two intermediate blocks 36 in the center, and a secondary winding of the same winding structure is installed between the intermediate block 36 and the end block 34 on both sides. It is a configuration.
- An insulating flange portion 38 is provided on the inner side of the end block 34 facing the secondary winding portion, and the intermediate block 36 has a flange function for partitioning the end surfaces of both winding portions, and the secondary winding portion.
- Each is provided with a plurality of insulating sub-flanges 40.
- the secondary shoreline is divided into regions divided by the sub-flange 40 and wound.
- a secondary lead-out groove 42 is formed on the bottom surface of the end block 34 of the bobbin 30, and a projection 44 is formed on the bottom surface of the intermediate block 36 to secure a path for passing the primary lead. These are used to determine the winding position of the bow I at the beginning and end of winding, and to prevent winding disturbance.
- Such a bobbin 30 is integrally formed of an electrically insulating resin. In this bobbin structure, the primary side can be made a para-coil, and in this way, a large current can be handled.
- necessary terminals 46 are provided on both sides of the end block 34 and the intermediate block 36, and the terminals are connected by connecting the terminals 46 to the terminals 46 and soldering them.
- the present embodiment shown in FIGS. 4 and 5 can adopt a force pin type configuration which is an example of a surface mount type.
- the magnetic circuit also has a combination force of the rod-shaped core 50 and the square frame-shaped core 52.
- the core material may be, for example, a ferrite material such as nickel, or a metal magnetic material.
- the rod-shaped core 50 has a rectangular cross section, and has a size that can be inserted into the winding shaft 32 of the bobbin 30. Further, the rectangular frame-shaped core 52 surrounds the outer periphery of the primary winding portion and the secondary winding portion of the bobbin 30, and faces the rod-shaped core 50 via the gap sheet 54 at both ends of the bobbin 30. It is the composition combined with.
- the insulation tape 56 is wound around the primary winding portion where the winding is applied, and the bobbin 30 and the rectangular frame-shaped core 52 are thereby temporarily fixed in a positioned state. This makes it possible to easily and accurately combine the rod-shaped core 50 and the square frame-shaped core 52.
- the rod-shaped core 50 is designed so as to protrude longer than the gap length equally than both end faces of the rectangular frame-shaped core 52.
- the rod-shaped core 50, the square frame-shaped core 52, and the bobbin 30 are fixed with an adhesive or the like after being positioned.
- the insulating tape 56 when the insulating tape 56 is wound around the primary winding portion with the winding, and the bobbin 30 and the rectangular frame-shaped core 52 are temporarily fixed in this state, the insulating tape Since the top surface of the transformer is smoothed by 56, it can be used as a suction surface when mounting the product.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Insulating Of Coils (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11/809,924 US7345567B2 (en) | 2004-12-02 | 2007-06-01 | Inverter transformer |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004-350323 | 2004-12-02 | ||
| JP2004350323A JP4707050B2 (ja) | 2004-12-02 | 2004-12-02 | インバータトランス |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US11/809,924 Continuation US7345567B2 (en) | 2004-12-02 | 2007-06-01 | Inverter transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2006059630A1 true WO2006059630A1 (ja) | 2006-06-08 |
Family
ID=36565064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2005/021966 Ceased WO2006059630A1 (ja) | 2004-12-02 | 2005-11-30 | インバータトランス |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US7345567B2 (ja) |
| JP (1) | JP4707050B2 (ja) |
| WO (1) | WO2006059630A1 (ja) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7538651B2 (en) * | 2007-09-10 | 2009-05-26 | Logah Technology Corp. | Winding structure of a transformer |
| JP5031781B2 (ja) * | 2009-01-30 | 2012-09-26 | 東光株式会社 | インバータトランス |
| CN101901670A (zh) * | 2009-06-01 | 2010-12-01 | 奥斯兰姆有限公司 | 高频互感器以及带有高频互感器的多路输出恒流源 |
| KR101645236B1 (ko) * | 2010-02-23 | 2016-08-04 | 삼성디스플레이 주식회사 | 트랜스포머와 이를 구비하는 액정 표시 장치 |
| CN102610376B (zh) * | 2012-04-12 | 2015-04-08 | 银川欣安瑞电气有限公司 | 臭氧发生器用大功率高频高压油浸式变压器 |
| US10796841B1 (en) * | 2016-05-06 | 2020-10-06 | Universal Lighting Technologies, Inc. | Inductor with flux path for high inductance at low load |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5476967A (en) * | 1977-11-30 | 1979-06-20 | Matsushita Electric Works Ltd | Stabilizer for discharge lamp |
| JPH02146815U (ja) * | 1989-05-11 | 1990-12-13 | ||
| JPH08227815A (ja) * | 1995-02-21 | 1996-09-03 | Fuji Elelctrochem Co Ltd | 複合巻線部品 |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59103316A (ja) * | 1982-12-06 | 1984-06-14 | Kijima Musen Kk | 電気巻線部品 |
| DE3621095A1 (de) * | 1986-06-24 | 1988-01-07 | Thomson Brandt Gmbh | Verfahren zum herstellen eines flachen spulenbandes |
| JPH02146815A (ja) | 1988-11-28 | 1990-06-06 | Mitsubishi Electric Corp | 半導体集積回路の入力回路 |
| US5359313A (en) * | 1991-12-10 | 1994-10-25 | Toko, Inc. | Step-up transformer |
| JPH0722528A (ja) | 1993-07-06 | 1995-01-24 | Toyota Autom Loom Works Ltd | 半導体装置およびその製造方法 |
| JP3844170B2 (ja) * | 1998-05-08 | 2006-11-08 | Tdk株式会社 | 箱形ノイズフィルタ |
| JP3368826B2 (ja) * | 1998-05-14 | 2003-01-20 | エフ・ディ−・ケイ株式会社 | 巻線部品およびその製造方法 |
| JP2000133531A (ja) * | 1998-10-27 | 2000-05-12 | Fuji Elelctrochem Co Ltd | チョークコイル一体型トランス |
| JP3906405B2 (ja) * | 2001-05-25 | 2007-04-18 | ミネベア株式会社 | インバータトランス |
| JP2004111528A (ja) * | 2002-09-17 | 2004-04-08 | Matsushita Electric Ind Co Ltd | マグネトロン駆動用昇圧トランス |
| JP3906413B2 (ja) * | 2003-01-07 | 2007-04-18 | ミネベア株式会社 | インバータトランス |
-
2004
- 2004-12-02 JP JP2004350323A patent/JP4707050B2/ja not_active Expired - Fee Related
-
2005
- 2005-11-30 WO PCT/JP2005/021966 patent/WO2006059630A1/ja not_active Ceased
-
2007
- 2007-06-01 US US11/809,924 patent/US7345567B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5476967A (en) * | 1977-11-30 | 1979-06-20 | Matsushita Electric Works Ltd | Stabilizer for discharge lamp |
| JPH02146815U (ja) * | 1989-05-11 | 1990-12-13 | ||
| JPH08227815A (ja) * | 1995-02-21 | 1996-09-03 | Fuji Elelctrochem Co Ltd | 複合巻線部品 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2006165063A (ja) | 2006-06-22 |
| JP4707050B2 (ja) | 2011-06-22 |
| US20070247267A1 (en) | 2007-10-25 |
| US7345567B2 (en) | 2008-03-18 |
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