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
IT8334023U IT8334023V0 (en) 1983-05-09 1983-05-09 SMT TRANSFORMER WITH FERRITE CORE.
IT3402383U 1983-05-09

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

Similar Documents

Publication Publication Date Title
GB2031230B (en) Coil bobbin assemblies
DE3468578D1 (en) Switch mode transformer having a ferrite core
GB1250827A (en)
DE3164409D1 (en) Line transformer for a television receiver
DE3366418D1 (en) ELECTRICAL TRANSFORMER
ES283173Y (en) ELECTRIC COIL.
JPS52152145A (en) Latching circulator
GB2042268B (en) Circuit interrupter with magnetic arc stretcher
ES8101304A1 (en) C-Core transformer
JPS5731121A (en) Molded transformer
GB2083290A (en) Low-loss reactor
JPS558063A (en) Manufacture of discharge lamp stabilizer iron core
DE3364809D1 (en) Clamp
JPS5626419A (en) Iron core for small transformer
JPS5721804A (en) High voltage transformer
JPS55105309A (en) High tension transformer
JPS5235473A (en) Electric cleaner
PL243249A1 (en) Low power transformer or choke with the coil placed on intersected tape-wound core
GB1426419A (en) Chokes reactors or transformers
JPS53116432A (en) Resin molded current transformer
JPS51136130A (en) Fly back transformer
JPS5324528A (en) Prevention device of electric shock
JPS5645006A (en) High-voltage transformer
JPS57120315A (en) Transformer with separable magnetic circuit
JPS5647013A (en) Holding device of bar-shaped light source

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

17P Request for examination filed

Effective date: 19850531

17Q First examination report despatched

Effective date: 19860704

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19880107

Ref country code: LI

Effective date: 19880107

Ref country code: CH

Effective date: 19880107

Ref country code: BE

Effective date: 19880107

Ref country code: AT

Effective date: 19880107

REF Corresponds to:

Ref document number: 31840

Country of ref document: AT

Date of ref document: 19880115

Kind code of ref document: T

ITF It: translation for a ep patent filed

Owner name: PROPRIA PROTEZIONE PROPR. IND.

REF Corresponds to:

Ref document number: 3468578

Country of ref document: DE

Date of ref document: 19880211

ET Fr: translation filed
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
ITPR It: changes in ownership of a european patent

Owner name: CESSIONE;PROCOND ELETTRONICA S.P.A.

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: 732

REG Reference to a national code

Ref country code: FR

Ref legal event code: TP

ITTA It: last paid annual fee
EPTA Lu: last paid annual fee
EAL Se: european patent in force in sweden

Ref document number: 84104976.0

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19960411

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19960418

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19960419

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19960424

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: LU

Payment date: 19960501

Year of fee payment: 13

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19970503

Ref country code: GB

Effective date: 19970503

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19970504

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19970503

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980130

EUG Se: european patent has lapsed

Ref document number: 84104976.0

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980203

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST