EP0131700A2 - Transformateur d'impulsions muni d'un noyau en ferrite - Google Patents

Transformateur d'impulsions muni d'un noyau en ferrite Download PDF

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Publication number
EP0131700A2
EP0131700A2 EP84104976A EP84104976A EP0131700A2 EP 0131700 A2 EP0131700 A2 EP 0131700A2 EP 84104976 A EP84104976 A EP 84104976A EP 84104976 A EP84104976 A EP 84104976A EP 0131700 A2 EP0131700 A2 EP 0131700A2
Authority
EP
European Patent Office
Prior art keywords
core
portions
legs
transformer
ferrite 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.)
Granted
Application number
EP84104976A
Other languages
German (de)
English (en)
Other versions
EP0131700B1 (fr
EP0131700A3 (en
Inventor
Giovanni Maddalon
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.)
Procond Elettronica SpA
Original Assignee
Zanussi Elettromeccanica 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 Zanussi Elettromeccanica SpA filed Critical Zanussi Elettromeccanica SpA
Priority to AT84104976T priority Critical patent/ATE31840T1/de
Publication of EP0131700A2 publication Critical patent/EP0131700A2/fr
Publication of EP0131700A3 publication Critical patent/EP0131700A3/en
Application granted granted Critical
Publication of EP0131700B1 publication Critical patent/EP0131700B1/fr
Expired 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/366—Electric or magnetic shields or screens made of ferromagnetic material
    • 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
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens

Definitions

  • the present invention relates to a transformer of the sc-called SMT (Switch Mcce TransforFer) type having a ferrite core.
  • the primary and secondary windings of a transformer of this type are usually wound in a concentric arrangement around one leg of a so-called "open" ferrite core substantially consisting of two E- or C-shaped portions joined to one another in a mirror-symmetrical arrangement.
  • the two core portions have usually been adhesively joined, as by the use of a suitable adhesive and/or adhesive tape, or secured to one another by means of screws and suitable clamping memebrs.
  • the assembly of the ferrite core and of the short-circuit winding obviously has to be carried out in two separate phases, whereby the assembly of the transformer as a whole is rendered undesirably complex.
  • an SMT-type transformer having a ferrite core one leg of which carries a primary and a secondary winding, the ferrite core comprising at least two complementary portions mirror-symmetrically joined to one another.
  • the transformer is mainly characterized in that it further comprises a retaining cage formed with a top surface adapted to cooperate with one portion of the core, a plurality of legs extending from the sides of the top surface and having free end portions adapted to be bent into engagement with the other portion of the core, so that the two complementary core portions are clamped within the cage between the top surface thereof and the end portions of the legs.
  • An SMT-type transformer shown in the figure comprises a body 1 formed of a primary and a secondary winding, the terminals 2 of which are clamped in a per se known manner in a support body 3.
  • Body 1 is wound on a central leg (not shown) of a ferrite core 4 formed of at least two complementary portions 5 and 6 mirror-symmetrically joined to one another.
  • the two portions 5 and 6 are substantially E-shaped, although they may also be of other configurations as required.
  • the two portions 5 and 6 are joined to one another in abutting relationship as generally known, so that body 1 of the transformer and support body 3 are imprisoned on the central leg of the core.
  • the two portions of the core are secured in position by means of a retaining cage 7 which may be formed of a preshaped components as for instance by punching.
  • Cage 7 is preferably of a ferromagnetic material and includes a top surface 8 adapted to cooperate with the upper en(! of core portion 5.
  • legs 9 are formed with suitable tabs 10 (shown before bending) and 11 (shown after having been bent).
  • cage 7 is integrally formed with annular portions 12 extending between legs 9 so as to surround the windings 1 of the transformer.
  • the short-circuit winding is also effective to limit the dispersion of the magnetic field of the transformer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Soft Magnetic Materials (AREA)
EP84104976A 1983-05-09 1984-05-03 Transformateur d'impulsions muni d'un noyau en ferrite Expired EP0131700B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84104976T ATE31840T1 (de) 1983-05-09 1984-05-03 Impulstransformator mit ferritkern.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8334023U IT8334023V0 (it) 1983-05-09 1983-05-09 Trasformatore smt con nucleo di ferrite.
IT3402383U 1983-05-09

Publications (3)

Publication Number Publication Date
EP0131700A2 true EP0131700A2 (fr) 1985-01-23
EP0131700A3 EP0131700A3 (en) 1985-05-15
EP0131700B1 EP0131700B1 (fr) 1988-01-07

Family

ID=11238756

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84104976A Expired EP0131700B1 (fr) 1983-05-09 1984-05-03 Transformateur d'impulsions muni d'un noyau en ferrite

Country Status (5)

Country Link
EP (1) EP0131700B1 (fr)
AT (1) ATE31840T1 (fr)
DE (1) DE3468578D1 (fr)
ES (1) ES278941Y (fr)
IT (1) IT8334023V0 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4937546A (en) * 1989-03-28 1990-06-26 Salom Electric Co., Ltd. Ring-core transformer
EP0609155A2 (fr) * 1989-12-01 1994-08-03 Thomson Television Components France Dispositif de blindage pour transformateur d'alimentation à découpage
EP1103994A1 (fr) * 1999-11-29 2001-05-30 Lucent Technologies Inc. Blindage contre les interférences électromagnétiques pour petits dispositifs magnétiques
CN111735994A (zh) * 2020-08-25 2020-10-02 广东电网有限责任公司东莞供电局 一种变压器检测用夹具

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3617854A (en) * 1970-04-20 1971-11-02 Raytheon Co Pulse transformer
US3668586A (en) * 1971-03-08 1972-06-06 Electronic Associates Transformer-inductor frame and kit
DE2209071A1 (de) * 1972-02-25 1973-08-30 Siemens Ag Abgleichbare elektrische spule, insbesondere fuer hybrid- und gedruckte schaltungen
GB2035706A (en) * 1978-11-09 1980-06-18 Tdk Electronics Co Ltd Inductance element

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3617854A (en) * 1970-04-20 1971-11-02 Raytheon Co Pulse transformer
US3668586A (en) * 1971-03-08 1972-06-06 Electronic Associates Transformer-inductor frame and kit
DE2209071A1 (de) * 1972-02-25 1973-08-30 Siemens Ag Abgleichbare elektrische spule, insbesondere fuer hybrid- und gedruckte schaltungen
GB2035706A (en) * 1978-11-09 1980-06-18 Tdk Electronics Co Ltd Inductance element

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM Technical Disclosure Bulletin, Vol. 23, No. 1, June 1980, New York, (US). C.C. CHACON et al.: "High Voltage Shield". * page 1, line 3 - page 2, line 4; figures * *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4937546A (en) * 1989-03-28 1990-06-26 Salom Electric Co., Ltd. Ring-core transformer
EP0609155A2 (fr) * 1989-12-01 1994-08-03 Thomson Television Components France Dispositif de blindage pour transformateur d'alimentation à découpage
EP0609155A3 (fr) * 1989-12-01 1994-12-14 Orega Electro Mecanique Dispositif de blindage pour transformateur d'alimentation à découpage.
EP1103994A1 (fr) * 1999-11-29 2001-05-30 Lucent Technologies Inc. Blindage contre les interférences électromagnétiques pour petits dispositifs magnétiques
US6950291B1 (en) 1999-11-29 2005-09-27 Lucent Technologies Inc. Electromagnetic interference shielding for small magnetic devices
CN111735994A (zh) * 2020-08-25 2020-10-02 广东电网有限责任公司东莞供电局 一种变压器检测用夹具
CN111735994B (zh) * 2020-08-25 2020-11-13 广东电网有限责任公司东莞供电局 一种变压器检测用夹具

Also Published As

Publication number Publication date
EP0131700B1 (fr) 1988-01-07
ATE31840T1 (de) 1988-01-15
ES278941Y (es) 1985-04-01
ES278941U (es) 1984-09-16
DE3468578D1 (en) 1988-02-11
IT8334023V0 (it) 1983-05-09
EP0131700A3 (en) 1985-05-15

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