EP1536436A1 - Method of producing planar transformers and planar transformer thus produced - Google Patents

Method of producing planar transformers and planar transformer thus produced Download PDF

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Publication number
EP1536436A1
EP1536436A1 EP03761602A EP03761602A EP1536436A1 EP 1536436 A1 EP1536436 A1 EP 1536436A1 EP 03761602 A EP03761602 A EP 03761602A EP 03761602 A EP03761602 A EP 03761602A EP 1536436 A1 EP1536436 A1 EP 1536436A1
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EP
European Patent Office
Prior art keywords
windings
resin
block
planar
insulating
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
EP03761602A
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German (de)
French (fr)
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EP1536436B1 (en
Inventor
Javier Gazo Pastor
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.)
Premo SA
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Premo SA
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Filing date
Publication date
Application filed by Premo SA filed Critical Premo SA
Publication of EP1536436A1 publication Critical patent/EP1536436A1/en
Application granted granted Critical
Publication of EP1536436B1 publication Critical patent/EP1536436B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/005—Impregnating or encapsulating
    • 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
    • H01F27/022—Encapsulation
    • 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
    • H01F27/2847—Sheets; Strips
    • 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
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • 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
    • H01F27/325—Coil bobbins
    • 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
    • H01F27/327—Encapsulating or impregnating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/04—Arrangements of electric connections to coils, e.g. leads
    • H01F2005/043—Arrangements of electric connections to coils, e.g. leads having multiple pin terminals, e.g. arranged in two parallel lines at both sides of the coil
    • 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
    • H01F2027/297—Terminals; Tapping arrangements for signal inductances with pin-like terminal to be inserted in hole of printed path

Definitions

  • This invention relates to a process for the manufacture of planar transformers and a planar transformer manufactured by means of said process.
  • the object of this invention is to provide planar transformers of very small size and with a large capacity for insulation between layers, in particular between windings, offering the further possibility that they may be manufactured economically.
  • this invention discloses the manufacture of planar transformers comprising solely of windings and insulating layers of variable thickness according to the insulation between integrated circuits and/or windings manufactured by the punching of copper sheets or wound copper, ensuring that there is dielectric strength in the vertical direction.
  • Document US 5,317,300 describes a wholly conventional non-planar transformer with a coil, windings and terminals and a core formed by retention plates. Therefore it relates in fact to a transformer which belongs to a wholly separate stage in the development of transformers. It is cited because unlike the documents mentioned above it describes the total or partial encapsulation of the transformer with a thermoplastic material by injection.
  • manufacture of the planar transformer is effected through a series of successive operations which in total comprise:
  • the insulating layers In order to achieve good penetration by the resin, for example polyurethane, between the windings, it is necessary for the insulating layers to be of sufficient size to permit such penetration, in order to leave a larger region for penetration by the insulating resin.
  • the resin for example polyurethane
  • the box for moulding the assembly of windings, insulating plates and printed circuits may be incorporated in the transformer for the purpose of acting as an envelope for the assembly, although the transformer may be manufactured in the manner indicated within a metal or shell mould, in which case there is no outer box moulding the polyurethane resin.
  • Figure 1 illustrates the set of parts forming a planar transformer manufactured according to this invention, in which the relative position of a resin moulding box and the ferrite cores can be seen.
  • Figure 2 shows a cross-section of the planar transformer on a larger scale in which the moulding box is arranged in the form of a protective envelope.
  • Figure 3 illustrates a second cross-section of the planar transformer along a plane parallel to that in Figure 2.
  • Figure 4 shows a plan view
  • a planar transformer according to this invention comprises a set of interleaved windings and insulating layers stacked into an assembly joined together by a set of connecting pins as seen in Figure 1, in which may be seen the laminar printed circuit winding members -1- and -2- and intermediate windings -3- and -4-, punched from copper sheet or wound from the same material, the separators of insulating material -5-, -6-, -7-, -8- and -9- being located on each side of the said members and having surface dimensions which are smaller than those of printed circuit windings -1- and -2-.
  • the arrangement is that which may be seen in Figures 2 and 3, in which the arrangement of the windings, printed circuit boards and separators can be seen, fixed in position through a variable number of through pins, with the pins represented by the numbers -10-, -10'-, -10"- ..., as may be seen in Figure 1, it being understood that their number and arrangement will depend on the circuits enclosed.
  • These pins are inserted in the corresponding orifices in the printed circuit boards and winding boards as indicated for example by numbers -11-, - 11'-, -11"- ... in printed circuit board -1- and numbers -12- and -12'- in winding -3-.
  • pins are attached to the said panels and windings in ways which are known in the art, for example by cold welding, cementing masses or other means.
  • the assembly is embedded in a mass of insulating resin, for example polyurethane, which can be achieved by casting in an external or "shell” mould or using a box of appropriate structure -13-, which has an external shape matching that of the printed circuit boards, with lateral steps such as -14- and -15- to match lateral notches -16- and -17- of the said printed circuit boards and an extended central core -18- designed to coincide with the central openings of the said stacked members, that is, printed circuit boards, windings and insulating separators.
  • insulating resin for example polyurethane
  • ferrite cores -19- and -20- are attached, being joined by laminar insulating members fitted externally thereto or by any other means known in the art.
  • Figure 4 illustrates a plan view of an embodiment of a planar transformer manufactured in accordance with this invention, in which will be seen enclosing box -13- incorporated in the mass of polyurethane resin, forming end blocks -21- and -34- which are interconnected by portions -22- and -23- of which only the beginning can be seen in Figure 4, edging the central opening -25-.
  • the ends of the connecting pins extend beyond the block of polyurethane resin, being represented by the numbers -26-, -27-, -28- and -29- in the case of block -20- and pins -30-, -31-, -32- and -33- in the case of block -21-, although it should be understood that the number and arrangement of the said pins may vary with the specific design of the planar transformer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Insulating Of Coils (AREA)

Abstract

A process for the manufacture of planar transformers and planar transformer manufactured in accordance therewith.
The planar transformer comprises a sequence of windings in a stack comprising a variable number of printed circuit winding boards and copper windings, punched from sheet or windings, with interleaved insulating laminar members in contact with all the surfaces of the coils and of variable thickness to adjust the gaps between the windings, the windings being connected together by means of connecting pins fixed thereto and comprising a single block so that all the stacked laminar members may be embedded in a single mass of insulating resin which covers the assembly of stacked members externally and which is introduced into the horizontal gaps between the windings.

Description

  • This invention relates to a process for the manufacture of planar transformers and a planar transformer manufactured by means of said process.
  • The object of this invention is to provide planar transformers of very small size and with a large capacity for insulation between layers, in particular between windings, offering the further possibility that they may be manufactured economically.
  • In order to achieve its object this invention discloses the manufacture of planar transformers comprising solely of windings and insulating layers of variable thickness according to the insulation between integrated circuits and/or windings manufactured by the punching of copper sheets or wound copper, ensuring that there is dielectric strength in the vertical direction.
  • Document US 5,010,314 discloses a planar condenser of the type comprising separate insulating planar printed circuit layers and copper windings. This transformer, of the same type as the transformer to which this invention relates, does not resolve the problem of obtaining adequate insulation in the horizontal direction, while occupying the least space possible, in a wholly satisfactory way.
  • Document US 5,929,743 discloses a flat coil member formed from a plurality of printed circuits stacked one above the other in which pillars interconnect the conducting strips of the printed circuit along at least one of the edges and also have connections to the exterior. This document does not relate to the type of transformer to which this invention relates.
  • Document US 6,000,128 describes a process for the manufacture of a stack of flat printed circuits prepared for connection by pillars on two sides of the stack and with two cores which are located at the base and top of the stack of circuits. Again this document does not relate to the type of transformer to which this invention relates.
  • Document US 5,317,300 describes a wholly conventional non-planar transformer with a coil, windings and terminals and a core formed by retention plates. Therefore it relates in fact to a transformer which belongs to a wholly separate stage in the development of transformers. It is cited because unlike the documents mentioned above it describes the total or partial encapsulation of the transformer with a thermoplastic material by injection.
  • The process of manufacture in accordance with this invention satisfactorily provides insulation in the horizontal direction in which the distance called "creepage" is conventionally defined as the minimum distance between the windings or winding and the core over the insulating surface area through air, occupying the least space possible.
  • In accordance with the process in accordance with this invention manufacture of the planar transformer is effected through a series of successive operations which in total comprise:
  • a) successive stacking of the laminar members constituting the windings with interleaved insulating layers on both sides and including the laminar members of multilayer printed circuits or printed circuits with double printed circuits or circuits printed on only one side,
  • b) fitting of the connecting plugs or pins inserted into aligned openings in the laminar members forming the windings and the winding printed circuit boards (PCB), proceeding to attach the pins both to the terminals of the copper windings and those of the printed circuits, simultaneously making an electrical connection between the said pins and the spatial mounting of the printed circuits, imparting high rigidity to the assembly,
  • c) casting a mass of resin, for example using a reusable or shell mould, forming a block, or fitting the assembly comprising the different stacked windings together with the insulating members within a box substantially matching the external shape of the said stacked and previously unified assembly, then proceeding to pour the insulating resin, for example polyurethane, at a very slow rate so as to allow it to enter between the windings until the desired depth within the box is reached, which might be the depth at which it is flush, after which and after the resin has hardened there is obtained a wholly compact assembly which is well insulated as a result of the resin's penetration between the layers of windings, providing great dielectric strength as well as small external dimensions.
  • In order to achieve good penetration by the resin, for example polyurethane, between the windings, it is necessary for the insulating layers to be of sufficient size to permit such penetration, in order to leave a larger region for penetration by the insulating resin.
  • Finally the externally attached ferrites are incorporated with the assembly formed by the windings, separators, printed circuits and connecting rods, all embedded in a mass of insulating polyurethane resin.
  • The box for moulding the assembly of windings, insulating plates and printed circuits may be incorporated in the transformer for the purpose of acting as an envelope for the assembly, although the transformer may be manufactured in the manner indicated within a metal or shell mould, in which case there is no outer box moulding the polyurethane resin.
  • For better understanding some drawings illustrating this invention are appended by way of an explanatory but not restrictive example.
  • Figure 1 illustrates the set of parts forming a planar transformer manufactured according to this invention, in which the relative position of a resin moulding box and the ferrite cores can be seen.
  • Figure 2 shows a cross-section of the planar transformer on a larger scale in which the moulding box is arranged in the form of a protective envelope.
  • Figure 3 illustrates a second cross-section of the planar transformer along a plane parallel to that in Figure 2.
  • Figure 4 shows a plan view.
  • As illustrated in these figures, a planar transformer according to this invention comprises a set of interleaved windings and insulating layers stacked into an assembly joined together by a set of connecting pins as seen in Figure 1, in which may be seen the laminar printed circuit winding members -1- and -2- and intermediate windings -3- and -4-, punched from copper sheet or wound from the same material, the separators of insulating material -5-, -6-, -7-, -8- and -9- being located on each side of the said members and having surface dimensions which are smaller than those of printed circuit windings -1- and -2-. The arrangement is that which may be seen in Figures 2 and 3, in which the arrangement of the windings, printed circuit boards and separators can be seen, fixed in position through a variable number of through pins, with the pins represented by the numbers -10-, -10'-, -10"- ..., as may be seen in Figure 1, it being understood that their number and arrangement will depend on the circuits enclosed. These pins are inserted in the corresponding orifices in the printed circuit boards and winding boards as indicated for example by numbers -11-, - 11'-, -11"- ... in printed circuit board -1- and numbers -12- and -12'- in winding -3-.
  • These pins are attached to the said panels and windings in ways which are known in the art, for example by cold welding, cementing masses or other means.
  • Once the set of windings with their insulating separators and fixing pins has been assembled, the assembly is embedded in a mass of insulating resin, for example polyurethane, which can be achieved by casting in an external or "shell" mould or using a box of appropriate structure -13-, which has an external shape matching that of the printed circuit boards, with lateral steps such as -14- and -15- to match lateral notches -16- and -17- of the said printed circuit boards and an extended central core -18- designed to coincide with the central openings of the said stacked members, that is, printed circuit boards, windings and insulating separators.
  • In order to achieve a satisfactory result it is essential that the thickness of the separators which form the passages for the resin must be adequate.
  • Once the insulating resin, preferably polyurethane resin, has been cured, ferrite cores -19- and -20- are attached, being joined by laminar insulating members fitted externally thereto or by any other means known in the art.
  • Figure 4 illustrates a plan view of an embodiment of a planar transformer manufactured in accordance with this invention, in which will be seen enclosing box -13- incorporated in the mass of polyurethane resin, forming end blocks -21- and -34- which are interconnected by portions -22- and -23- of which only the beginning can be seen in Figure 4, edging the central opening -25-. The ends of the connecting pins extend beyond the block of polyurethane resin, being represented by the numbers -26-, -27-, -28- and -29- in the case of block -20- and pins -30-, -31-, -32- and -33- in the case of block -21-, although it should be understood that the number and arrangement of the said pins may vary with the specific design of the planar transformer.

Claims (4)

  1. A planar transformer, of the type comprising a succession of windings in a stack comprising a variable number of printed circuit winding boards and copper windings, punched from sheet or wound, with interleaved insulating laminar members in contact with all the surfaces of the windings and of variable thickness to adjust the gaps between the windings, characterised in that the said windings are connected together by connecting pins incorporated therewith, and in that the transformer comprises a single block as a result of all the stacked laminar elements being embedded in a single mass of insulating resin which covers the assembly of stacked members externally and which enters the horizontal gaps between the windings, leaving the external ferrite cores connected to the preassembled block and embedded in the mass of polyurethane, bound by external insulating material which extends over the entire external surface.
  2. A planar transformer according to Claim 1, characterised in that the resin block containing the windings, separators and pins of the transformer is incorporated within an open insulating box which fits the base, the lateral profile of the said block and its central opening.
  3. A process for the manufacture of planar transformers according to Claims 1 and 2, proceeding through a first stage of vertically stacking the printed circuit coil boards and the laminar windings with interleaved laminar separators in both the upper or lower parts of the stack, characterised in that these are fastened by inserting connecting pins fitted in the aligned orifices of the windings, securing the pins with said windings and finally proceeding to pour a mass of polyurethane resin into a mould which surrounds the previously assembled block comprising the windings, separators and connecting pins, pouring the resin at a suitable rate to permit the insulating resin to penetrate the gaps between the windings.
  4. A process according to Claim 3, characterised in that the mass of polyurethane resin is poured within a surrounding box which has a sealed bottom and is open at the top which externally matches the shape of the preassembled block of windings and separators, filling with resin until flush with the upper surface in order to form a block.
EP03761602.6A 2002-06-26 2003-06-23 Method of producing planar transformers and planar transformer thus produced Expired - Lifetime EP1536436B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ES200201465 2002-06-26
ES200201465A ES2197830B1 (en) 2002-06-26 2002-06-26 PROCEDURE FOR THE MANUFACTURE OF PLANAR TRANSFORMERS AND PLANAR TRANSFORMER MANUFACTURED IN ACCORDANCE WITH IT.
PCT/ES2003/000309 WO2004003947A1 (en) 2002-06-26 2003-06-23 Method of producing planar transformers and planar transformer thus produced

Publications (2)

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EP1536436A1 true EP1536436A1 (en) 2005-06-01
EP1536436B1 EP1536436B1 (en) 2017-01-25

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EP03761602.6A Expired - Lifetime EP1536436B1 (en) 2002-06-26 2003-06-23 Method of producing planar transformers and planar transformer thus produced

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EP (1) EP1536436B1 (en)
AU (1) AU2003242793A1 (en)
ES (1) ES2197830B1 (en)
WO (1) WO2004003947A1 (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2230676A2 (en) 2009-03-19 2010-09-22 TDK Corporation Coil component, transformer, switching power supply unit, and method for manufacturing coil component
EP2500918A1 (en) * 2011-03-16 2012-09-19 Delphi Technologies, Inc. Planar Magnetic Structure
DE102011075707A1 (en) * 2011-05-12 2012-11-15 SUMIDA Components & Modules GmbH Transformer with laminated winding
CN102791076A (en) * 2012-08-27 2012-11-21 河南兵峰电子科技有限公司 PCB (Printed Circuit Board) planar transformer
WO2014062357A1 (en) * 2012-10-17 2014-04-24 Covidien Lp Planar transformers having reduced termination losses
EP2583288A4 (en) * 2010-06-21 2015-07-29 Lg Innotek Co Ltd Planar transformer
US9196414B2 (en) 2012-10-17 2015-11-24 Covidien Lp Planar transformers having reduced termination losses
US9620278B2 (en) 2014-02-19 2017-04-11 General Electric Company System and method for reducing partial discharge in high voltage planar transformers
EP3370240A4 (en) * 2015-10-28 2019-06-26 Terra Bee Co., Ltd. Transformer
CN110444373A (en) * 2018-05-02 2019-11-12 联宝电子股份有限公司 Magnetic induction component and its manufacturing method
US11152146B2 (en) * 2017-11-30 2021-10-19 Premo, S.A. Annular magnetic power unit
WO2023232437A1 (en) * 2022-05-30 2023-12-07 Valeo Eautomotive France Sas Planar electrical transformer and assembly
EP4362051A1 (en) * 2022-10-25 2024-05-01 Delta Electronics, Inc. Printed circuit board, power transformer, and manufacturing method thereof

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ES2393695B1 (en) * 2012-11-12 2013-08-08 Premo, S.L. Transformer with integrated inductor
KR102647780B1 (en) * 2022-06-13 2024-03-14 케이에이치필룩스 주식회사 Transformer
KR102657251B1 (en) * 2024-03-07 2024-04-15 주식회사 씨트로닉스 Transformer having plate coil

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US6211767B1 (en) * 1999-05-21 2001-04-03 Rompower Inc. High power planar transformer
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US5317300A (en) * 1990-03-13 1994-05-31 Boesel Robert P Encapsulated high efficiency transformer and power supply
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GUNEWARDENA T.R.: "Manufacturing design considerations for planar magnetics", ELECTRICAL INSULATION CONFERENCE, 1997, AND ELECTRICAL MANUFACTURING & COIL WINDING CONFERENCE. PROCEEDINGS ROSEMONT, IL, USA 22-25 SEPT. 1997, NEW YORK, NY, USA,IEEE, US, 22 September 1997 (1997-09-22), pages 309-311, XP010265713, ISBN: 978-0-7803-3959-0 *
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Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2230676A3 (en) * 2009-03-19 2011-08-03 TDK Corporation Coil component, transformer, switching power supply unit, and method for manufacturing coil component
US8217749B2 (en) 2009-03-19 2012-07-10 Tdk Corporation Coil component, transformer, switching power supply unit, and method for manufacturing coil component
EP2230676A2 (en) 2009-03-19 2010-09-22 TDK Corporation Coil component, transformer, switching power supply unit, and method for manufacturing coil component
EP2583288A4 (en) * 2010-06-21 2015-07-29 Lg Innotek Co Ltd Planar transformer
US9401243B2 (en) 2010-06-21 2016-07-26 Lg Innotek Co., Ltd. Planar transformer
EP2500918A1 (en) * 2011-03-16 2012-09-19 Delphi Technologies, Inc. Planar Magnetic Structure
US8441331B2 (en) 2011-03-16 2013-05-14 Delphi Technologies, Inc. Planar magnetic structure
US8516684B2 (en) 2011-03-16 2013-08-27 Delphi Technologies, Inc. Planar magnetic structure
DE102011075707A1 (en) * 2011-05-12 2012-11-15 SUMIDA Components & Modules GmbH Transformer with laminated winding
CN102791076A (en) * 2012-08-27 2012-11-21 河南兵峰电子科技有限公司 PCB (Printed Circuit Board) planar transformer
CN102791076B (en) * 2012-08-27 2014-09-03 河南兵峰电子科技有限公司 PCB (Printed Circuit Board) planar transformer
US10390876B2 (en) 2012-10-17 2019-08-27 Covidien Lp Planar transformers having reduced termination losses
US9196414B2 (en) 2012-10-17 2015-11-24 Covidien Lp Planar transformers having reduced termination losses
WO2014062357A1 (en) * 2012-10-17 2014-04-24 Covidien Lp Planar transformers having reduced termination losses
US9449746B2 (en) 2012-10-17 2016-09-20 Covidien Lp Methods of manufacturing planar transformers
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
EP3370240A4 (en) * 2015-10-28 2019-06-26 Terra Bee Co., Ltd. Transformer
US11152146B2 (en) * 2017-11-30 2021-10-19 Premo, S.A. Annular magnetic power unit
CN110444373A (en) * 2018-05-02 2019-11-12 联宝电子股份有限公司 Magnetic induction component and its manufacturing method
CN110444373B (en) * 2018-05-02 2021-12-17 联宝电子股份有限公司 Magnetic induction component and manufacturing method thereof
WO2023232437A1 (en) * 2022-05-30 2023-12-07 Valeo Eautomotive France Sas Planar electrical transformer and assembly
EP4362051A1 (en) * 2022-10-25 2024-05-01 Delta Electronics, Inc. Printed circuit board, power transformer, and manufacturing method thereof

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EP1536436B1 (en) 2017-01-25
AU2003242793A1 (en) 2004-01-19
WO2004003947A1 (en) 2004-01-08
ES2197830B1 (en) 2005-01-01
ES2197830A1 (en) 2004-01-01

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