EP0855723A3 - Transformer with controlled interwinding coupling and controlled leakage inductances and circuit using such transformer - Google Patents

Transformer with controlled interwinding coupling and controlled leakage inductances and circuit using such transformer Download PDF

Info

Publication number
EP0855723A3
EP0855723A3 EP98102797A EP98102797A EP0855723A3 EP 0855723 A3 EP0855723 A3 EP 0855723A3 EP 98102797 A EP98102797 A EP 98102797A EP 98102797 A EP98102797 A EP 98102797A EP 0855723 A3 EP0855723 A3 EP 0855723A3
Authority
EP
European Patent Office
Prior art keywords
transformer
controlled
windings
leakage inductance
medium
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Withdrawn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
EP98102797A
Other languages
German (de)
French (fr)
Other versions
EP0855723A2 (en
Inventor
Patrizio Vinciarelli
Jay M. Prager
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.)
VLT Corp
Original Assignee
VLT Corp
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 VLT Corp filed Critical VLT Corp
Priority to EP98202478A priority Critical patent/EP0881647B1/en
Priority claimed from EP92308315A external-priority patent/EP0532360B1/en
Publication of EP0855723A2 publication Critical patent/EP0855723A2/en
Publication of EP0855723A3 publication Critical patent/EP0855723A3/en
Withdrawn legal-status Critical Current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
    • H01F27/346—Preventing or reducing leakage fields
    • 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
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
    • 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

Abstract

A transformer in which a magnetic medium provides flux paths within the medium, two or more windings enclose the flux paths at separated locations along the paths, and an electrically conductive medium, arranged in the vicinity of the magnetic medium and the windings, defines a boundary within which flux emanation from the magnetic medium and the windings is confined and suppressed. In a transformer constructed in accordance with the present invention, both controlled values of leakage inductance and the benefits of separated windings can be achieved. The conductive medium can be configured to reduce the leakage inductance of a controlled-leakage inductance transformer (e.g. for use in a zero-current switching power converter), having separately located windings, by at least 25%, and can be configured to reduce the leakage inductance of a low-leakage inductance transformer (e.g. for use in a PWM power converter), having separately located windings, by at least 75%.
EP98102797A 1991-09-13 1992-09-14 Transformer with controlled interwinding coupling and controlled leakage inductances and circuit using such transformer Withdrawn EP0855723A3 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP98202478A EP0881647B1 (en) 1991-09-13 1992-09-14 Transformers and methods of controlling leakage inductance in transformers

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US75951191A 1991-09-13 1991-09-13
US759511 1991-09-13
EP92308315A EP0532360B1 (en) 1991-09-13 1992-09-14 Transformer

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP92308315A Division EP0532360B1 (en) 1991-09-13 1992-09-14 Transformer

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP98202478A Division EP0881647B1 (en) 1991-09-13 1992-09-14 Transformers and methods of controlling leakage inductance in transformers

Publications (2)

Publication Number Publication Date
EP0855723A2 EP0855723A2 (en) 1998-07-29
EP0855723A3 true EP0855723A3 (en) 1998-11-11

Family

ID=26132179

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98102797A Withdrawn EP0855723A3 (en) 1991-09-13 1992-09-14 Transformer with controlled interwinding coupling and controlled leakage inductances and circuit using such transformer

Country Status (1)

Country Link
EP (1) EP0855723A3 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE516309C (en) * 1929-09-15 1931-01-22 Koch & Sterzel Akt Ges Method for connecting the joints of at least two parts which, when assembled without the use of wedge, screw or rivet, result in a self-contained ring body
FR2558639A1 (en) * 1984-01-20 1985-07-26 Thomson Csf Mat Tel Method and machine for automatic assembling of pot core ferrite circuit transformers.
US4891620A (en) * 1988-07-22 1990-01-02 Cheng Bruce C H Insulating tubeless transformer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE516309C (en) * 1929-09-15 1931-01-22 Koch & Sterzel Akt Ges Method for connecting the joints of at least two parts which, when assembled without the use of wedge, screw or rivet, result in a self-contained ring body
FR2558639A1 (en) * 1984-01-20 1985-07-26 Thomson Csf Mat Tel Method and machine for automatic assembling of pot core ferrite circuit transformers.
US4891620A (en) * 1988-07-22 1990-01-02 Cheng Bruce C H Insulating tubeless transformer

Also Published As

Publication number Publication date
EP0855723A2 (en) 1998-07-29

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