EP1341193A1 - Transformateur - Google Patents

Transformateur Download PDF

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Publication number
EP1341193A1
EP1341193A1 EP02425094A EP02425094A EP1341193A1 EP 1341193 A1 EP1341193 A1 EP 1341193A1 EP 02425094 A EP02425094 A EP 02425094A EP 02425094 A EP02425094 A EP 02425094A EP 1341193 A1 EP1341193 A1 EP 1341193A1
Authority
EP
European Patent Office
Prior art keywords
bobbin
wall
terminals
transformer according
ferromagnetic core
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Withdrawn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
EP02425094A
Other languages
German (de)
English (en)
Inventor
Antonio Canova
Davide Brocchi
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.)
Magnetek SpA
Original Assignee
Magnetek 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 Magnetek SpA filed Critical Magnetek SpA
Priority to EP02425094A priority Critical patent/EP1341193A1/fr
Publication of EP1341193A1 publication Critical patent/EP1341193A1/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Withdrawn legal-status Critical Current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
    • 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
    • H01F27/29—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
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support

Definitions

  • the present invention relates to a transformer and, in particular, to a transformer of small dimensions designed to be applied on a card carrying an electronic circuit.
  • the transformer In producing these components, it is necessary to contain the dimensions of the transformer as much as possible, since the transformer constitutes one of the components of largest overall dimensions and hence one of the most critical components as regards miniaturization of circuits.
  • the reduction in the overall dimensions of the transformer encounters a limit also in current safety standards, which require a minimum air gap between the primary winding and the secondary winding.
  • the two windings must be separated from one another by an air gap that is equal to or greater than a minimum currently fixed at six millimetres.
  • This requirement imposes large dimensions on the component, in so far as each point of the two windings must come to be at a large distance from the ferromagnetic core. This applies also, and in particular, to the connection terminals between the windings and the circuit in which the transformer is used.
  • the present invention relates more specifically to the production of a transformer in which the windings are made in a traditional way using metal wires wound on a bobbin.
  • these transformers there are provided for each winding respective terminals, which are normally L-shaped, to which the ends of the wires of the respective windings are knotted and then soldered.
  • Each terminal is inserted in a seat made from the same plastic material that forms the bobbin for supporting the windings.
  • transformers of this type are known in which, in order to obtain a sufficient air gap between each terminal and the ferromagnetic core, a laminar plate is associated to the bobbin, the said plate covering the face of the ferromagnetic core that faces the terminals, and furthermore the bobbin has a particularly large dimension as regards its height.
  • the terminals are inserted in seats made in the bobbin, said seats being at a large distance from the ferromagnetic core. This involves a large size of the transformer. More in particular, the transformer proves particularly high on account of the need for distancing the terminals from the ferromagnetic core.
  • a reduction in overall dimensions is rendered problematical by the fact that it is not possible to close the terminals in housing seats, but instead it is necessary for them to protrude from said seats to be, on the one side, accessible for connection to the electronic circuit and, on the other, accessible for creating the connection between each terminal and the respective end of the conductor that forms the winding, this in so far as said connection calls for a manual binding to be carried out first, followed by tin soldering. Both of the operations call for ease of accessibility to the terminal.
  • the purpose of the present invention is to provide a transformer that will enable observance of the conditions imposed by safety standards, with overall dimensions of the transformer that are sufficiently contained and, on the other hand, will maintain ease of accessibility to the terminals for making the necessary electrical connections.
  • a transformer comprising: a bobbin on which at least two windings of the transformer are formed; on said bobbin, two sets of seats for two corresponding sets of terminals to which the ends of the wires forming the windings are electrically connected; and a ferromagnetic core defining a magnetic circuit and developing around the bobbin and through it.
  • a transformer comprising: a bobbin on which at least two windings of the transformer are formed; on said bobbin, two sets of seats for two corresponding sets of terminals to which the ends of the wires forming the windings are electrically connected; and a ferromagnetic core defining a magnetic circuit and developing around the bobbin and through it.
  • two insulating elements applied to the bobbin after formation of the windings and after joining of the components forming the ferromagnetic core.
  • the insulating elements are arranged in positions corresponding to the two sets of terminals carried at the ends of the bobbin in order to separate the terminals electrically from the ferromagnetic core with an air gap that is sufficiently large to meet the safety standards, for instance with an air gap of at least 6 mm.
  • the use of these insulating elements applied around the terminals enables the necessary insulation to be achieved without increasing the overall dimensions of the transformer as will appear clearly from the description of an example of the embodiment.
  • both the winding bobbin and the two insulating elements can be made of moulded plastic.
  • each of these components can be made with a single piece of moulded plastic with minimal costs.
  • each of these is constrained to the respective end of the bobbin by means of a pair of elastic tabs.
  • Said tabs may be made of a single piece with the respective insulating element.
  • each insulating element will have a pair of walls which are mutually orthogonal and which define a contrast sectional strip against an edge of said ferromagnetic core.
  • a first one of said walls extends between the ferromagnetic core and the corresponding seats of the terminals of the bobbin, whilst the second wall develops parallel to a face of the ferromagnetic core orthogonal to the axis of the bobbin and orthogonal to the first wall of the insulating element.
  • the transformer which is designated as a whole by 1, comprises a ferromagnetic core 3, made for example of ferrite and consisting of two portions 3A and 3B, each of which is E-shaped.
  • a bobbin 5 On the central element or pillar - designated by 3C - of the ferromagnetic core 3 there is fitted a bobbin 5 on which the primary and secondary windings are formed.
  • the bobbin 5 is made of moulded synthetic plastic material and has a first winding area 5A and a second winding area 5B.
  • the area 5A is delimited between a terminal flange 5X and an annular projection 5C, whilst the area 5B is delimited between this annular projection 5C and a second flange 5Y.
  • windings by coiling one or more conductive wires.
  • these windings are indicated only partially and limitedly to a wire-shaped conductor F1 and F2 for the windings in the area 5A and in the area 5B, respectively.
  • F1 and F2 for the windings in the area 5A and in the area 5B, respectively.
  • the bobbin is equipped with seats for respective connection terminals of the windings to the external circuit in which the transformer is inserted.
  • two sets of seats are provided, designated by 7A and 7B, for a corresponding number of L-shaped terminals 9A and 9B.
  • Each seat consists of a cylindrical sleeve with a through hole and a side opening, within which the terminals 9A and 9B are inserted.
  • the number of terminals for each set is sufficient for making the connection for all the windings that can be made on the corresponding area 5A or 5B of the winding bobbin 5.
  • each set there is defined a passage 11, through which the respective end of the wire that is to be connected to one of the two terminals adjacent to the passage itself can come out of the winding area to be knotted and then soldered to the stretch of the terminal 9A or 9D, which develops parallel to the axis A-A of the bobbin 5.
  • the stretch of the terminal 9A or 9B orthogonal to the axis A-A of the winding bobbin forms the connection to the circuit in which the transformer is to be inserted.
  • each terminal 9A of the first set from each terminal 9B of the second set with an air gap of at least 6 mm, or in any case of a size that reflects current safety standards
  • two insulating elements indicated as a whole by 15, which are substantially the same as one another, only one of which will be described in detail in what follows.
  • the insulating elements 15 have a basically box-like conformation open on two sides.
  • Each of the aforesaid insulating elements has a first wall 17, which extends between a face of the ferromagnetic core 3 and the portion of the bobbin 5 that forms the respective seats 7A or 7B for the terminals 9A or 9B.
  • the wall 17 extends, in a direction opposite to the ferromagnetic core 3, beyond the second wall 19, and connects to a side 21 that develops orthogonally to the wall 17 and parallel to the second wall 19.
  • the side 21 extends with two small lateral sides that are orthogonal thereto, these being designated by 23.
  • Each of the two small lateral sides 23 terminates with a respective elastic tab 25 provided with a tooth 27 that engages with a projection 29 made on the outside of the end seat 7A or 7B.
  • the wall 17 extends laterally beyond the sides 23 and beyond the elastic tabs 25 so as to prevent there being an air gap that is too small between the terminals and the ferromagnetic core underneath the elastic tabs 25, which must project from the small lateral sides 23.
  • the portions of the terminals 9A and 9B, parallel to the axis A-A of the winding bobbin 5, are in this way surrounded by the wall 17 and by the sides 21, 23 of the respective insulating element 15.
  • the air gap that separates each terminal 9A, 9B from the ferromagnetic core can in this way be sufficiently large to meet current safety standards, without any need for increasing the overall dimensions of the transformer.
  • the process of construction of the transformer involves the steps described in what follows. First of all, the conductors are wound on the bobbin 5, which is separate from the ferromagnetic core 3 and is without the insulating elements 15. The ends of each conductor are knotted to the respective terminals 9A, 9B of the two sets of terminals housed in the seats 7A and 7B of the bobbin 5. The next step is tinning, i.e., soldering of the ends of the conductors onto the respective terminals. Once soldering has been carried out, the two portions 3A and 3B of the ferromagnetic core 3 can be fitted onto the bobbin.
  • the two insulating elements 15 are applied, which are inserted with the walls 17 between the ends of the bobbin 5 that form the seats 7A and 7B and the ferromagnetic core 3.
  • the transformer thus assembled is ready to be installed on a card S (Fig. 3) of an electronic circuit, to which it is connected by means of the ends of the terminals 9A and 9B oriented so that they are orthogonal to the axis A-A of the winding bobbin.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
EP02425094A 2002-02-22 2002-02-22 Transformateur Withdrawn EP1341193A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02425094A EP1341193A1 (fr) 2002-02-22 2002-02-22 Transformateur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02425094A EP1341193A1 (fr) 2002-02-22 2002-02-22 Transformateur

Publications (1)

Publication Number Publication Date
EP1341193A1 true EP1341193A1 (fr) 2003-09-03

Family

ID=27675805

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02425094A Withdrawn EP1341193A1 (fr) 2002-02-22 2002-02-22 Transformateur

Country Status (1)

Country Link
EP (1) EP1341193A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101090035B (zh) * 2006-06-16 2010-05-12 鸿富锦精密工业（深圳）有限公司 耐压磁性元件及使用其的光源驱动装置
JP2019201041A (ja) * 2018-05-14 2019-11-21 Ｎｊコンポーネント株式会社 コイル部品

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1529136A (en) * 1977-08-25 1978-10-18 Pye Ltd Bobbins for electrical coils
US5157368A (en) * 1990-02-09 1992-10-20 Tamura Corporation Thin type transformer
US5815061A (en) * 1996-01-19 1998-09-29 Computer Products, Inc. Low cost and manufacturable transformer meeting safety requirements

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1529136A (en) * 1977-08-25 1978-10-18 Pye Ltd Bobbins for electrical coils
US5157368A (en) * 1990-02-09 1992-10-20 Tamura Corporation Thin type transformer
US5815061A (en) * 1996-01-19 1998-09-29 Computer Products, Inc. Low cost and manufacturable transformer meeting safety requirements

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101090035B (zh) * 2006-06-16 2010-05-12 鸿富锦精密工业（深圳）有限公司 耐压磁性元件及使用其的光源驱动装置
JP2019201041A (ja) * 2018-05-14 2019-11-21 Ｎｊコンポーネント株式会社 コイル部品
JP7141848B2 (ja) 2018-05-14 2022-09-26 Ｎｊコンポーネント株式会社 コイル部品

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