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EP0131700B1 - Transformateur d'impulsions muni d'un noyau en ferrite - Google Patents

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

Info

Publication number
EP0131700B1
EP0131700B1 EP84104976A EP84104976A EP0131700B1 EP 0131700 B1 EP0131700 B1 EP 0131700B1 EP 84104976 A EP84104976 A EP 84104976A EP 84104976 A EP84104976 A EP 84104976A EP 0131700 B1 EP0131700 B1 EP 0131700B1
Authority
EP
European Patent Office
Prior art keywords
core
portions
legs
transformer
top surface
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.)
Expired
Application number
EP84104976A
Other languages
German (de)
English (en)
Other versions
EP0131700A3 (en
EP0131700A2 (fr
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 switch mode transformer having a ferrite core, according to the pre-characterizing part of the patent claim.
  • the primary and secondary windings of a transformer of this type, disclosed in US-A-3 668 586, are 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 are secured to one another by means of a metal frame including integral bendable tabs capable of holding the two core portions together.
  • 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 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 pre-shaped 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 end 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)

Claims (2)

1. Transformateur d'impulsions équipé d'un nouau en ferrite (4) dont une branche porte l'enroulement primaire et l'enroulement secondaire, ce noyau en ferrite (4) comportant au moins deux portions complémentaires (5, 6), reliées l'une à l'autre d'une manière symétrique dans un miroir par une cage de retenue (7) ayant une surface supérieure (8) adaptée pour coopérer avec une première portion (5) due ce noyau (4), plusieurs branches (9) partant des côtés de cette surface supérieure et ayant des parties terminales libres (10, 11) adaptées pour coopérer avec la deuxième portion (6) du noyau (4) de sorte que les deux portions de noyau complémentaires (5, 6) sont bridées à l'intérieur de la cage (7) entre surface supérieure (8) et les parties terminales des branches (9), caractérisé en ce que la cage de retenue (7) est en matière ferromagnétique et comporte, d'un seul tenant, des portions annulaires (12), s'étendant entre les branches (9) et formant une spire de court-circuit autour des enroulements (1) du transformateur.
2. Transformateur d'impulsions selon la revendication 1, caractérisé en ce que des languettes (10, 11) sont formées sur les parties terminales libres des branches (9) et sont adaptées pour être amenées par pliage en prise avec le noyau (4).
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
IT3402383U 1983-05-09
IT8334023U IT8334023V0 (it) 1983-05-09 1983-05-09 Trasformatore smt con nucleo di ferrite.

Publications (3)

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

Families Citing this family (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
FR2655475B1 (fr) * 1989-12-01 1992-02-21 Orega Electro Mecanique Dispositif de blindage pour transformateur d'alimentation a decoupage.
US6950291B1 (en) * 1999-11-29 2005-09-27 Lucent Technologies Inc. Electromagnetic interference shielding for small magnetic devices
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

Family Cites Families (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
GB2035706B (en) * 1978-11-09 1983-05-05 Tdk Electronics Co Ltd Inductance element

Also Published As

Publication number Publication date
EP0131700A3 (en) 1985-05-15
ES278941Y (es) 1985-04-01
EP0131700A2 (fr) 1985-01-23
ES278941U (es) 1984-09-16
DE3468578D1 (en) 1988-02-11
IT8334023V0 (it) 1983-05-09
ATE31840T1 (de) 1988-01-15

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