EP3564975A1 - Transformateur haute frequence - Google Patents

Transformateur haute frequence Download PDF

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Publication number
EP3564975A1
EP3564975A1 EP19168863.9A EP19168863A EP3564975A1 EP 3564975 A1 EP3564975 A1 EP 3564975A1 EP 19168863 A EP19168863 A EP 19168863A EP 3564975 A1 EP3564975 A1 EP 3564975A1
Authority
EP
European Patent Office
Prior art keywords
transformer
tubular elements
elements
turns
plastic material
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.)
Withdrawn
Application number
EP19168863.9A
Other languages
German (de)
English (en)
Inventor
Alberto Pallottini
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.)
Rgm SpA
Original Assignee
Rgm SpA
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 Rgm SpA filed Critical Rgm SpA
Publication of EP3564975A1 publication Critical patent/EP3564975A1/fr
Withdrawn legal-status Critical Current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
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/10—Single-phase transformers
    • 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
    • H01F27/2823—Wires
    • 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
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • 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
    • H01F19/00—Fixed transformers or mutual inductances of the signal type
    • H01F19/04—Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range
    • H01F19/08—Transformers having magnetic bias, e.g. for handling pulses
    • H01F2019/085—Transformer for galvanic isolation
    • 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
    • H01F27/2823—Wires
    • H01F2027/2833—Wires using coaxial cable as wire
    • 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

Definitions

  • the present invention relates to electrical transformers, and in particular concerns high-frequency transformers.
  • High frequency transformers have application fields mainly aimed at obtaining high-value currents from an energy source, such as an inverter; one of the main characteristics of high-frequency transformers is that of having small dimensions compared to low-frequency transformers, a feature that favors their use in modular structures.
  • a high-frequency transformer must take into account the needs related to its structure, which must be able to better absorb the generated vibrations, and which must adequately dissipate the heat, as well as being able to minimize the parasitic currents.
  • transformer structures having cores of stacks of iron laminates E-shaped or with toroidal cores with the coils wound on the toroid, do not often meet the expected results in this area, except with an increase in the size of the transformer and therefore with a significant loss of the advantages related to the use of high frequency transformers.
  • a high-voltage and high-frequency transformer with ferrite core which has at least two parallel portions comprising a plurality of conductors connected to each other at their respective ends, and at least one ferrite core of suitable dimensions, arranged on each of the two portions.
  • one of the conductors of each group of conductors is tubular, and the remaining conductors are arranged within the same.
  • the aim of the present invention is therefore to provide a high frequency transformer which is made with a simple, modular structure, and which is provided with a minimum encumbrance, having at the same time a solidity which allows optimal operation, limiting noise and dispersions thereto associated.
  • An object of the present invention is therefore a transformer comprising at least one pair of juxtaposed supporting tubular elements, rigidly connected to each other at a respective end, being at the opposite end connected to appropriate support means, and being arranged on each of said tubular elements a plurality of ferromagnetic annular elements sized to cooperate with said tubular elements and adapted to form the core of said transformer, the windings of said transformer being arranged coaxially with said tubular elements.
  • the supporting tubular elements are extruded in insulating plastic material, which have an outer diameter corresponding to the inner diameter of the cores, and show on the outer wall a plurality of axial grooves angularly equidistant from each other, suitable for housing the turns of the primary, a central duct being provided for each tubular element designed to house the turns of at least one secondary winding.
  • the ends of said tubular elements are coupled to insulating plates, preferably of the same material as said tubular elements.
  • the transformer according to the present invention can be inserted into a metal box-like body, preferably made of steel or the like, substantially parallelepipedal-shaped, and of appropriate size to contain the transformer, in which is poured a thermo-conductive resin so as to completely cover the transformer; preferably the resin is an epoxy resin.
  • Figure 1 shows an embodiment of the transformer according to the present invention
  • the supporting tubular elements 7, better visible in Figure 2 support the ferromagnetic rings 3, which constitute the core of the transformer, and allow the arrangement of both the primary winding 5 and the secondary winding 6.
  • the windings are provided with the respective insulating sheaths 105 and 106, and the terminals of connections 115 and 116.
  • the plates 2 and 202 are arranged.
  • the two tubular elements 7 are connected to each other by means of the two bridges 207, as it appears better visible in Figure 2 .
  • each tubular element 7 provides housing in its outer surface to the primary winding 5 and in its inner conduit to the secondary 6.
  • the two bridges 207 connect the two tubular elements 7 together.
  • Figure 3 shows a section of a variant embodiment of the transformer according to the embodiment illustrated in Figures 1 and 2 ; to the equal parts correspond equal numerals.
  • the figure shows the transformer inserted in a box-like container body 8, filled with a resin 108; moreover, the fact that the two columns of the annular elements 3 that make up the core of the transformer are connected to each other by means of a bead 103 of resin deposited in the construction of the transformer itself is also highlighted.
  • the figure shows also the structure of the tubular elements 7, which have a plurality, in this case six, longitudinal grooves 107 angularly equidistant to each other, in which the turns of the primary winding 5 are arranged, while the turns of the secondary winding are located in the conduit 307, formed coaxially with the tubular carrier element 7.
  • Both the cable 115 of the primary winding 5 and the cable 116 of the secondary winding 6 are multi-stranded.
  • transformers are known in which the core is formed by a plurality of annular ferromagnetic elements juxtaposed in at least two columns, inside which the turns of the windings are conducted.
  • This structure given the reduced overall section required for high-frequency transformers, guarantees its compact dimensions compared to the more usual type structures, and minimizes the parasitic currents, given the substantially coaxial positioning of the primary and secondary turns.
  • the supporting tubular elements 7 are extruded in plastic material, provided with the appropriate mechanical properties and a reasonably high glass transition temperature, higher than 100°C, which are formed with a central duct and a plurality of longitudinal grooves angularly equidistant from each other.
  • plastic material provided with the appropriate mechanical properties and a reasonably high glass transition temperature, higher than 100°C, which are formed with a central duct and a plurality of longitudinal grooves angularly equidistant from each other.
  • polycarbonate which has a glass transition temperature in the order of 147°C, was taken into consideration as a preferred material and can therefore be used up to temperatures in the order of 130°C.
  • This thermoplastic resin has excellent mechanical properties and is well suited for extrusion.
  • the grooves allow the windings of the transformer primary to be positioned and distributed properly, while the secondary can be placed inside the central duct.
  • the tubular elements also act in this way as isolation between primary and secondary; the ends of the two tubular elements are connected to each other with two bridges of plastic material, preferably of the same material in which the tubular elements are made.
  • the transformer is inserted into a container body made of metallic material, preferably steel or the like, then filled with a thermoconductive resin, generally bicomponent epoxy resins.
  • a thermoconductive resin generally bicomponent epoxy resins.
  • the ferromagnetic annular elements which make up the core of the transformer according to the invention will preferably be made of high permeability ferrite, permalloy, or ferrocarbonyl.
  • the connecting cord between the two columns of annular elements is preferably in epoxy glue such as Araldite®.
  • the windings will preferably be made of Litz wire, i.e. a multi-strand wire in which the different strands are insulated from each other; this wire is designed to reduce losses caused by the skin effect and by the proximity effect in conductors used at frequencies up to about 1 MHz.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Coils Of Transformers For General Uses (AREA)
EP19168863.9A 2017-10-20 2018-10-10 Transformateur haute frequence Withdrawn EP3564975A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102017000119003A IT201700119003A1 (it) 2017-10-20 2017-10-20 Trasformatore ad alta frequenza
EP18199516.8A EP3474300B1 (fr) 2017-10-20 2018-10-10 Transformateur à haute fréquence

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP18199516.8A Division-Into EP3474300B1 (fr) 2017-10-20 2018-10-10 Transformateur à haute fréquence
EP18199516.8A Division EP3474300B1 (fr) 2017-10-20 2018-10-10 Transformateur à haute fréquence

Publications (1)

Publication Number Publication Date
EP3564975A1 true EP3564975A1 (fr) 2019-11-06

Family

ID=61581405

Family Applications (2)

Application Number Title Priority Date Filing Date
EP18199516.8A Active EP3474300B1 (fr) 2017-10-20 2018-10-10 Transformateur à haute fréquence
EP19168863.9A Withdrawn EP3564975A1 (fr) 2017-10-20 2018-10-10 Transformateur haute frequence

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP18199516.8A Active EP3474300B1 (fr) 2017-10-20 2018-10-10 Transformateur à haute fréquence

Country Status (2)

Country Link
EP (2) EP3474300B1 (fr)
IT (1) IT201700119003A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112164583A (zh) * 2020-10-14 2021-01-01 广州爱磁电子有限公司 一种高频变压器绕组及其加工方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7443711B2 (ja) * 2019-09-24 2024-03-06 株式会社Ｊｖｃケンウッド 高周波トランス
IT202100015065A1 (it) 2021-06-09 2022-12-09 Rgm S P A Trasformatore ad alta frequenza con dissipazione termica migliorata

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1385867A (en) 1972-03-20 1975-03-05 Marconi Co Ltd Ferrite-cored transformers
EP1496527A1 (fr) 2003-07-11 2005-01-12 Lincoln Global, Inc. Module de transformateur pour machine à souder
EP1675139A2 (fr) 2004-12-23 2006-06-28 Lincoln Global, Inc. Source d'alimentation pour dispositif à plasma

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6087916A (en) * 1996-07-30 2000-07-11 Soft Switching Technologies, Inc. Cooling of coaxial winding transformers in high power applications

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1385867A (en) 1972-03-20 1975-03-05 Marconi Co Ltd Ferrite-cored transformers
EP1496527A1 (fr) 2003-07-11 2005-01-12 Lincoln Global, Inc. Module de transformateur pour machine à souder
EP1675139A2 (fr) 2004-12-23 2006-06-28 Lincoln Global, Inc. Source d'alimentation pour dispositif à plasma

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
RAULS MARK S ET AL: "Multiturn High-Frequency Coaxial Winding Power Transformers", IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, IEEE SERVICE CENTER, PISCATAWAY, NJ, US, vol. 31, no. 1, 1 January 1995 (1995-01-01), pages 112 - 118, XP011645419, ISSN: 0093-9994, [retrieved on 20170410], DOI: 10.1109/28.363042 *
SEUNGHUN SAMUEL BAEK ET AL: "Accurate equivalent circuit modeling of a medium-voltage and high-frequency coaxial winding DC-link transformer for solid state transformer applications", ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE), 2012 IEEE, IEEE, 15 September 2012 (2012-09-15), pages 1439 - 1446, XP032467457, ISBN: 978-1-4673-0802-1, DOI: 10.1109/ECCE.2012.6342645 *
TANG WEI-JIA, JIANG DAO-ZHUO, YIN RUI, LIANG YI-QIAO,WANG YU-FEN: "Design of coaxial transformer for modular isolated DC/DC converters", JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), vol. 51, no. 8, 1 August 2017 (2017-08-01) - 1 August 2017 (2017-08-01), pages 1646 - 1652, XP002794310 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112164583A (zh) * 2020-10-14 2021-01-01 广州爱磁电子有限公司 一种高频变压器绕组及其加工方法

Also Published As

Publication number Publication date
EP3474300B1 (fr) 2020-12-02
EP3474300A2 (fr) 2019-04-24
IT201700119003A1 (it) 2019-04-20
EP3474300A3 (fr) 2019-07-10

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