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EP0131700A3 - Switch mode transformer having a ferrite core - Google Patents

Switch mode transformer having a ferrite core Download PDF

Info

Publication number
EP0131700A3
EP0131700A3 EP84104976A EP84104976A EP0131700A3 EP 0131700 A3 EP0131700 A3 EP 0131700A3 EP 84104976 A EP84104976 A EP 84104976A EP 84104976 A EP84104976 A EP 84104976A EP 0131700 A3 EP0131700 A3 EP 0131700A3
Authority
EP
European Patent Office
Prior art keywords
core
legs
portions
ferrite core
switch mode
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 versions
EP0131700B1 (en
EP0131700A2 (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/en
Publication of EP0131700A2 publication Critical patent/EP0131700A2/en
Publication of EP0131700A3 publication Critical patent/EP0131700A3/en
Application granted granted Critical
Publication of EP0131700B1 publication Critical patent/EP0131700B1/en
Expired legal-status Critical Current

Links

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

An SMT-type transformer comrprises a ferrite core formed of two complementary portions mirror-symmetrically joined to one another, and a body including a primary and a secondary winding supported on one of the legs of the core. The two core portions are retained in the assembled condition by a retaining cage (7) preferably formed of a ferromagnetic material and having a top surface (8) engaging one core portion (5), and a plurality of legs (9) extending from the top surface and having end portions (10, 11) adapted to be bent into angagement with the other core portion (6). Integrally foremd with the legs are annular portions (12) surrounding the winding body (1) so as to constitute a short-circuit winding therearound.
EP84104976A 1983-05-09 1984-05-03 Switch mode transformer having a ferrite core Expired EP0131700B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84104976T ATE31840T1 (en) 1983-05-09 1984-05-03 PULSE TRANSFORMER WITH FERRITE CORE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT3402383U 1983-05-09
IT8334023U IT8334023V0 (en) 1983-05-09 1983-05-09 SMT TRANSFORMER WITH FERRITE CORE.

Publications (3)

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

Family

ID=11238756

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84104976A Expired EP0131700B1 (en) 1983-05-09 1984-05-03 Switch mode transformer having a ferrite core

Country Status (5)

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

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 (en) * 1989-12-01 1992-02-21 Orega Electro Mecanique SHIELDING DEVICE FOR A CUT-OUT POWER TRANSFORMER.
US6950291B1 (en) 1999-11-29 2005-09-27 Lucent Technologies Inc. Electromagnetic interference shielding for small magnetic devices
CN111735994B (en) * 2020-08-25 2020-11-13 广东电网有限责任公司东莞供电局 Clamp for transformer detection

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 (en) * 1972-02-25 1973-08-30 Siemens Ag ADJUSTABLE ELECTRIC COIL, IN PARTICULAR FOR HYBRID AND PRINTED CIRCUITS
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 (en) * 1972-02-25 1973-08-30 Siemens Ag ADJUSTABLE ELECTRIC COIL, IN PARTICULAR FOR HYBRID AND PRINTED CIRCUITS
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 * *

Also Published As

Publication number Publication date
EP0131700B1 (en) 1988-01-07
DE3468578D1 (en) 1988-02-11
ES278941U (en) 1984-09-16
EP0131700A2 (en) 1985-01-23
ATE31840T1 (en) 1988-01-15
ES278941Y (en) 1985-04-01
IT8334023V0 (en) 1983-05-09

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