EP1973124A1 - Transformateur planaire indépendant - Google Patents

Transformateur planaire indépendant Download PDF

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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
Application number
EP07005609A
Other languages
German (de)
English (en)
Other versions
EP1973124B1 (fr
Inventor
Ming-En Hsu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABC Taiwan Electronics Corp
Original Assignee
ABC Taiwan Electronics Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ABC Taiwan Electronics Corp filed Critical ABC Taiwan Electronics Corp
Priority to AT07005609T priority Critical patent/ATE554487T1/de
Priority to EP07005609A priority patent/EP1973124B1/fr
Publication of EP1973124A1 publication Critical patent/EP1973124A1/fr
Application granted granted Critical
Publication of EP1973124B1 publication Critical patent/EP1973124B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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.
EP07005609A 2007-03-19 2007-03-19 Transformateur planaire indépendant Not-in-force EP1973124B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT07005609T ATE554487T1 (de) 2007-03-19 2007-03-19 Unabhängiger planarer transformator
EP07005609A EP1973124B1 (fr) 2007-03-19 2007-03-19 Transformateur planaire indépendant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07005609A EP1973124B1 (fr) 2007-03-19 2007-03-19 Transformateur planaire indépendant

Publications (2)

Publication Number Publication Date
EP1973124A1 true EP1973124A1 (fr) 2008-09-24
EP1973124B1 EP1973124B1 (fr) 2012-04-18

Family

ID=38359747

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07005609A Not-in-force EP1973124B1 (fr) 2007-03-19 2007-03-19 Transformateur planaire indépendant

Country Status (2)

Country Link
EP (1) EP1973124B1 (fr)
AT (1) ATE554487T1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010035132A1 (fr) * 2008-09-26 2010-04-01 Lincoln Global, Inc. Transformateur plan et son procédé de fabrication
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10062496B2 (en) 2015-02-26 2018-08-28 Lear Corporation Planar transformer

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0435461A2 (fr) 1989-12-29 1991-07-03 AT&T Corp. Composant magnétique de faible profil ayant plusieurs enroulements à couches
EP0689214A1 (fr) 1994-06-21 1995-12-27 Sumitomo Special Metals Co., Ltd. Procédé de fabrication de substrat à enroulements imprimés à multicouches, substrats à enroulements imprimés et composants à enroulements imprimés
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0435461A2 (fr) 1989-12-29 1991-07-03 AT&T Corp. Composant magnétique de faible profil ayant plusieurs enroulements à couches
EP0689214A1 (fr) 1994-06-21 1995-12-27 Sumitomo Special Metals Co., Ltd. Procédé de fabrication de substrat à enroulements imprimés à multicouches, substrats à enroulements imprimés et composants à enroulements imprimés
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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010035132A1 (fr) * 2008-09-26 2010-04-01 Lincoln Global, Inc. Transformateur plan et son procédé de fabrication
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 (fr) 2012-04-18
ATE554487T1 (de) 2012-05-15

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