EP1973124A1 - Unabhängiger planarer Transformator - Google Patents
Unabhängiger planarer Transformator Download PDFInfo
- Publication number
- EP1973124A1 EP1973124A1 EP07005609A EP07005609A EP1973124A1 EP 1973124 A1 EP1973124 A1 EP 1973124A1 EP 07005609 A EP07005609 A EP 07005609A EP 07005609 A EP07005609 A EP 07005609A EP 1973124 A1 EP1973124 A1 EP 1973124A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- circuit board
- magnetic device
- printed circuit
- winding
- primary
- 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.)
- Granted
Links
- 238000004804 winding Methods 0.000 claims abstract description 109
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052802 copper Inorganic materials 0.000 claims abstract description 16
- 239000010949 copper Substances 0.000 claims abstract description 16
- 229910000679 solder Inorganic materials 0.000 claims abstract description 7
- 229910001035 Soft ferrite Inorganic materials 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 description 14
- 238000010586 diagram Methods 0.000 description 11
- 239000004020 conductor Substances 0.000 description 8
- 230000002500 effect on skin Effects 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004377 microelectronic Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000012536 packaging technology Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005549 size reduction Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/0006—Printed inductances
- H01F17/0013—Printed inductances with stacked layers
-
- 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
- H01F27/2804—Printed windings
-
- 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
- H01F27/29—Terminals; Tapping arrangements for signal inductances
-
- 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
- H01F27/2804—Printed windings
- H01F2027/2809—Printed windings on stacked layers
-
- 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
- H01F27/2804—Printed windings
- H01F2027/2819—Planar transformers with printed windings, e.g. surrounded by two cores and to be mounted on printed circuit
-
- 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
- H01F27/02—Casings
- H01F27/027—Casings specially adapted for combination of signal type inductors or transformers with electronic circuits, e.g. mounting on printed circuit boards
-
- 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
- H01F27/2847—Sheets; Strips
- H01F27/2852—Construction of conductive connections, of leads
Definitions
- the present invention relates to a high-efficiency independent planar transformer that comprises at least one printed circuit board having a multi-layer structure having at least two layers to form equal or unequal numbers of inductor winding turns, at least two planar copper plates or two printed circuit boards to constitute two respective secondary windings, a pair of up-and-down symmetrical soft ferrite magnetic cores, and several electrically connecting terminals.
- the magnetic device is widely applied to a power supply, and more particularly to a DC/DC converter (shown in FIG. 1 ).
- microelectronic circuits are using lower and lower voltage. 5 V and 12 V are no longer dominant power supplies used in microelectronic circuits. 3.3V, 2.5V, 2V, 1.8V, 1.5V, and even 1.2V are becoming standard voltage in many electronic devices. Actually, some next-generation high-speed microprocessors and digital signal processors need 1.0 V as their supply voltage.
- the winding coils of the planar transformer is constructed of double-layer or multilayer printed circuit board or pre-molded planar copper plate.
- the planar transformer can be realized upon the successful development of the planar magnetic cores.
- the planar transformer has significantly increased power density and significantly decreased volume. Accordingly, the volume and thickness of the planar transformer are reduced respectively to only 20 percent and 40 percent of that of the conventional transformer.
- the conventional transformer is formed by winding the circular copper wires on the ferrite magnetic core to form winding coil. Therefore, the copper wires can not be fully utilized because of the generation of skin effect, which is especially apparent in high-frequency condition.
- the winding is a flat conductor formed by plating copper on the printed circuit board or using the copper plate directly.
- the electric current is focused on the outer surface layer due to the skin effect, the electric current still flow through the entire flat conducting wire for the planar transformer.
- the planar transformer In comparison with the cylindrical conducting wire, the planar transformer has higher transformation efficiency and power density.
- the winding of the planar transformer is not formed on the main circuit board, and it is independent of the main circuit board. Therefore, it is more flexible and changeable than the embedded planar transformer in the practical application. In addition, the present invention can reduce the cost of material effectively.
- the primary winding has a geometric configuration so the DC loss can be minimized.
- the primary winding and the secondary windings are stacked in an interlaced manner so the AC loss can be also minimized. Therefore, the transformation efficiency of the transformer can be increased, thereby achieving the effect of saving power.
- FIG. 1 is a schematic diagram of prior art DC/DC converter.
- FIG. 2 is an elevational decomposed diagram showing the magnetic device of the present invention.
- FIG. 3 is a front plan view showing the magnetic device of the present invention.
- FIG. 4 is an elevational decomposed diagram showing the magnetic device of another preferred embodiment of the present invention.
- FIG. 5 is a front plan view showing the magnetic device of another preferred embodiment of the present invention.
- FIG. 6 is a schematic diagram showing the printed circuit board that has four inductor winding turns constituted by four internal layers in accordance with the present invention.
- FIG. 7 is a schematic plan diagram showing the output connection structure and the upwardly disposed component side of the printed circuit board in accordance with the present invention.
- FIG. 8 is a schematic plan diagram showing the output connection structure and the upwardly disposed solder side of the printed circuit board in accordance with the present invention.
- FIG. 9 is a schematic diagram showing the primary winding coupled to the output connection structure in accordance with the present invention.
- FIG. 10 is another schematic diagram showing the primary winding coupled to the output connection structure in accordance with the present invention.
- FIG. 11 is a schematic diagram showing the secondary winding coupled to the output connection structure in accordance with the present invention.
- FIG. 12 is another schematic diagram showing the secondary winding coupled to the output connection structure in accordance with the present invention.
- FIGS. 2 through 5 there is shown an independent planar transformer, which comprises the devices described below.
- a pair of up-and-down symmetrical ER-type or RM-type soft ferrite magnetic cores (201, 202 or 301, 302).
- At least one printed circuit board (203, 204 or 303) capable of forming different numbers of inductor winding turns to constitute a primary winding of the planar transformer.
- the primary winding comprises at least one printed circuit board (203, 204 or 303), and every printed circuit board (203, 204 or 303) has a multi-layer structure having at least two layers to form the inductor winding with at least four turns.
- Two secondary windings comprise at least two planar copper plates (205, 206) or two printed circuit boards (304, 305). Every planar copper plate (205, 206) constitutes one inductor winding turn.
- the printed circuit boards (304, 305) each have a multi-layer structure having at least two layers to form the inductor winding with at least one turn.
- these two printed circuit boards (304, 305) that constitute the secondary windings have the same number of inductor winding turns.
- the primary winding and the secondary windings of the planar transformer are electrically connected to a main circuit board via terminals (207, 208 or 306, 307).
- the magnetic device and the main circuit board are electrically connected via output terminals, and these two windings can be connected to each other in series or in parallel by the output terminals or the short-circuit connection with the main circuit board.
- the magnetic device and the main circuit board are electrically connected via the output terminals.
- the primary winding and the secondary winding, the primary winding and the primary winding, the secondary winding and the secondary winding of the transformer are respectively electrically isolated from each other by one or more insulating layers.
- these two planar copper plates (205, 206) or the printed circuit boards (304, 305) that constitute the secondary windings are stacked together with the printed circuit board (203, 204 or 303) that constitutes the primary winding in a sandwich configuration.
- every printed circuit board (203, 204, 303, 304 and 305) comprises a multilayer structure having at least two layers, wherein every layer can constitute one or more inductor winding turns.
- the independent planar transformer is a part of a DC/DC converter.
- the primary inductor winding is constituted by the printed circuit board (203, 204 or 303).
- the printed circuit board (203, 204 or 303).
- FIG. 6 there is shown a schematic diagram depicting the printed circuit board that has four inductor winding turns constituted by four internal layers. Because the unique output structure for the inductor winding is employed, the winding connection structure as shown in FIG. 7 is formed when the component side of the printed circuit board is upwardly disposed. Besides, the winding connection structure as shown in FIG. 8 is formed when the solder side of the printed circuit board is upwardly disposed.
- the primary winding which is constituted by at least one printed circuit board (203, 204 or 303)
- the component side (shown in FIG. 7 ) or the solder side (shown in FIG. 8 ) of the same printed circuit board (203, 204 or 303) is upwardly disposed
- different output connection structures of the inductor winding can be formed, as shown in FIG. 9 and FIG. 10 .
- two printed circuit boards (203, 204 or 303) that have the same number of inductor winding turns are stacked in sequence to constitute the primary windings by upwardly disposing their respective component sides, these two primary windings can be connected to each other in parallel via the terminals on the magnetic device directly.
- the magnetic device and the main circuit board can be electrically connected via the terminals (207, 208 or 306, 307).
- these two windings can be connected to each other in series or in parallel by short-circuit connection with the main circuit board, as shown in FIGS. 11 and 12 .
- the unique output structure for the inductor winding is employed, in the primary winding, two different kinds of output connection structures of the inductor winding can be formed by upward disposing different sides (the component side and the solder side as shown in FIG. 7 and FIG. 8 ) of the same printed circuit board (203, 204 or 303).
- the inductor winding output in series connection and the inductor winding output in parallel connection can be accomplished by means of the output terminals or the short-circuit connection with the main circuit board.
- the advantage of it consists in the ability to provide much more winding combinations to satisfy requirements of series products that require different input and output voltages so at least a half of the cost for producing the printed circuit board can be reduced, thereby reducing the production cost significantly.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Coils Or Transformers For Communication (AREA)
- Dc-Dc Converters (AREA)
- Coils Of Transformers For General Uses (AREA)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07005609A EP1973124B1 (de) | 2007-03-19 | 2007-03-19 | Unabhängiger planarer Transformator |
AT07005609T ATE554487T1 (de) | 2007-03-19 | 2007-03-19 | Unabhängiger planarer transformator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07005609A EP1973124B1 (de) | 2007-03-19 | 2007-03-19 | Unabhängiger planarer Transformator |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1973124A1 true EP1973124A1 (de) | 2008-09-24 |
EP1973124B1 EP1973124B1 (de) | 2012-04-18 |
Family
ID=38359747
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07005609A Not-in-force EP1973124B1 (de) | 2007-03-19 | 2007-03-19 | Unabhängiger planarer Transformator |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1973124B1 (de) |
AT (1) | ATE554487T1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010035132A1 (en) * | 2008-09-26 | 2010-04-01 | Lincoln Global, Inc. | Planar transformer and method of manufacturing |
US9620278B2 (en) | 2014-02-19 | 2017-04-11 | General Electric Company | System and method for reducing partial discharge in high voltage planar transformers |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10062496B2 (en) | 2015-02-26 | 2018-08-28 | Lear Corporation | Planar transformer |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0435461A2 (de) | 1989-12-29 | 1991-07-03 | AT&T Corp. | Niedrigprofil-Magnetkomponente mit mehreren Schichtwindungen |
EP0689214A1 (de) | 1994-06-21 | 1995-12-27 | Sumitomo Special Metals Co., Ltd. | Herstellungsverfahren für Substrat mit mehrschichtigen gedruckten Spulen, Substrate mit gedruckten Spulen und Komponenten mit gedruckten Spulen |
GB2337863A (en) | 1998-05-09 | 1999-12-01 | Frederick E Bott | Method and means of forming a desired coil configuration |
US20050212640A1 (en) | 2004-03-24 | 2005-09-29 | Chiang Man-Ho | Multi-layer printed circuit board transformer winding |
-
2007
- 2007-03-19 AT AT07005609T patent/ATE554487T1/de active
- 2007-03-19 EP EP07005609A patent/EP1973124B1/de not_active Not-in-force
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0435461A2 (de) | 1989-12-29 | 1991-07-03 | AT&T Corp. | Niedrigprofil-Magnetkomponente mit mehreren Schichtwindungen |
EP0689214A1 (de) | 1994-06-21 | 1995-12-27 | Sumitomo Special Metals Co., Ltd. | Herstellungsverfahren für Substrat mit mehrschichtigen gedruckten Spulen, Substrate mit gedruckten Spulen und Komponenten mit gedruckten Spulen |
GB2337863A (en) | 1998-05-09 | 1999-12-01 | Frederick E Bott | Method and means of forming a desired coil configuration |
US20050212640A1 (en) | 2004-03-24 | 2005-09-29 | Chiang Man-Ho | Multi-layer printed circuit board transformer winding |
Non-Patent Citations (1)
Title |
---|
GARCIA O ET AL: "A standard design method for high frequency PCB transformers", TELECOMMUNICATIONS ENERGY CONFERENCE, 1995. INTELEC '95., 17TH INTERNATIONAL THE HAGUE, NETHERLANDS 29 OCT.-1 NOV. 1995, NEW YORK, NY, USA,IEEE, US, 29 October 1995 (1995-10-29), pages 335 - 339, XP010161254, ISBN: 0-7803-2750-0 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010035132A1 (en) * | 2008-09-26 | 2010-04-01 | Lincoln Global, Inc. | Planar transformer and method of manufacturing |
US8054154B2 (en) | 2008-09-26 | 2011-11-08 | Linclon Global, Inc. | Planar transformer and method of manufacturing |
US9620278B2 (en) | 2014-02-19 | 2017-04-11 | General Electric Company | System and method for reducing partial discharge in high voltage planar transformers |
US10236113B2 (en) | 2014-02-19 | 2019-03-19 | General Electric Company | System and method for reducing partial discharge in high voltage planar transformers |
Also Published As
Publication number | Publication date |
---|---|
EP1973124B1 (de) | 2012-04-18 |
ATE554487T1 (de) | 2012-05-15 |
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