EP0142207A1 - Leakage transformer with small stray field - Google Patents

Leakage transformer with small stray field Download PDF

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Publication number
EP0142207A1
EP0142207A1 EP84201621A EP84201621A EP0142207A1 EP 0142207 A1 EP0142207 A1 EP 0142207A1 EP 84201621 A EP84201621 A EP 84201621A EP 84201621 A EP84201621 A EP 84201621A EP 0142207 A1 EP0142207 A1 EP 0142207A1
Authority
EP
European Patent Office
Prior art keywords
coils
primary
air gap
transformer
stray field
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Withdrawn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
EP84201621A
Other languages
German (de)
French (fr)
Inventor
Gerben Simon Hoeksma
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.)
Nederlandsche Apparatenfabriek NEDAP NV
Original Assignee
Nederlandsche Apparatenfabriek NEDAP NV
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 Nederlandsche Apparatenfabriek NEDAP NV filed Critical Nederlandsche Apparatenfabriek NEDAP NV
Publication of EP0142207A1 publication Critical patent/EP0142207A1/en
Withdrawn legal-status Critical Current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
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/08—High-leakage transformers or inductances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/043—Fixed inductances of the signal type  with magnetic core with two, usually identical or nearly identical parts enclosing completely the coil (pot cores)

Definitions

  • the invention relates to a leakage transformer with small stray field.
  • a leakage transformer is used, for example, in the D.C.-to-A.C. voltage converter disclosed in applicants' published European patent application 83 201 258.7 and in the Series Resonant Power Supply disclosed in, inter alia, "Proceedings of the Second International Power Conversion Conference 1980", pp. 2.8.1 to 2.8.18.
  • a sufficiently high leakage i.e. a coupling factor of from 60 to 90 percent between primary and secondary coils, can be obtained by winding the primary and the secondary winding on individual spools and mounting these spools each on the centre leg of an E-core half, which halves are separated by an air gap.
  • a drawback inherent in such a structure is the generation of a relatively large stray field liable to cause spurious signals in other circuitry or sensors.
  • a closed pot core transformer 1 includes a cover disc 2 having two through holes, a primary coil 3, a secondary coil 4 and a magnetic shunt 5 interposed between coils 3 and 4.
  • the air gap 6 is provided in the centre leg.
  • the stray field is now confined in the core, while the coupling factor can be adjusted by varying the ratio between air gap 6 in the centre leg and air gap 7 between shunt and centre leg and/or outer wall.
  • they can be placed in a housing 8 and fixed by means of a suitable cast mass 9.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Regulation Of General Use Transformers (AREA)

Abstract

A leakage transformer in which primary coils and secondary coils are mounted on a centre leg of a pot core transformer, which pot core transformer is fully closed apart from one or a few through holes permitting the lead wires for the coils to be fed out. An air gap is provided in the centre leg and a magnetic shut is provided between the primary coil(s) and the secondary coil(s), the air gap and the magnetic shunt together defining the coupling factor between the primary and secondary coils.

Description

  • The invention relates to a leakage transformer with small stray field. A leakage transformer is used, for example, in the D.C.-to-A.C. voltage converter disclosed in applicants' published European patent application 83 201 258.7 and in the Series Resonant Power Supply disclosed in, inter alia, "Proceedings of the Second International Power Conversion Conference 1980", pp. 2.8.1 to 2.8.18. A sufficiently high leakage, i.e. a coupling factor of from 60 to 90 percent between primary and secondary coils, can be obtained by winding the primary and the secondary winding on individual spools and mounting these spools each on the centre leg of an E-core half, which halves are separated by an air gap. A drawback inherent in such a structure is the generation of a relatively large stray field liable to cause spurious signals in other circuitry or sensors.
  • It is an object of the invention to provide such a transformer structure that a leakage transformer with small stray field is achieved.
  • An embodiment of the invention is schematically shown in cross-sectional view in the accompanying drawing.
  • In the drawing, a closed pot core transformer 1 includes a cover disc 2 having two through holes, a primary coil 3, a secondary coil 4 and a magnetic shunt 5 interposed between coils 3 and 4. The air gap 6 is provided in the centre leg. The stray field is now confined in the core, while the coupling factor can be adjusted by varying the ratio between air gap 6 in the centre leg and air gap 7 between shunt and centre leg and/or outer wall. To keep the transformer components together, they can be placed in a housing 8 and fixed by means of a suitable cast mass 9.

Claims (1)

  1. A leakage transformer which is characterized in that primary coils and secondary coils are mounted on a centre leg of a pot core transformer, said pot core transformer being fully closed apart from one or a few through holes permitting the lead wires for the coils to be fed out, an air gap being provided in the centre leg and a magnetic shunt being provided between the primary coil(s) and the secondary coil(s), said air gap and said magnetic shunt together defining the coupling factor between the primary and secondary coils.
EP84201621A 1983-11-10 1984-11-08 Leakage transformer with small stray field Withdrawn EP0142207A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8303994 1983-11-10
NL8303994A NL8303994A (en) 1983-11-10 1983-11-10 SPRAY FIELD LEAK TRANSFORMER.

Publications (1)

Publication Number Publication Date
EP0142207A1 true EP0142207A1 (en) 1985-05-22

Family

ID=19842744

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84201621A Withdrawn EP0142207A1 (en) 1983-11-10 1984-11-08 Leakage transformer with small stray field

Country Status (3)

Country Link
EP (1) EP0142207A1 (en)
JP (1) JPS60216521A (en)
NL (1) NL8303994A (en)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10349401B3 (en) * 2003-10-21 2004-07-29 Grenzebach Bsh Gmbh Veneer drying plant with stacked drying zones in successive horizontal planes and separate control of temperature and/or humidity for each drying zone
WO2009114872A1 (en) * 2008-03-14 2009-09-17 Volterra Semiconductor Corporation Magnetic components with m-phase coupling, and related inductor structures
US7746209B1 (en) 2002-12-13 2010-06-29 Volterra Semiconductor Corporation Method for making magnetic components with N-phase coupling, and related inductor structures
US7893806B1 (en) 2002-12-13 2011-02-22 Volterra Semiconductor Corporation Method for making magnetic components with N-phase coupling, and related inductor structures
US7965165B2 (en) 2002-12-13 2011-06-21 Volterra Semiconductor Corporation Method for making magnetic components with M-phase coupling, and related inductor structures
US7994888B2 (en) 2009-12-21 2011-08-09 Volterra Semiconductor Corporation Multi-turn inductors
US8102233B2 (en) 2009-08-10 2012-01-24 Volterra Semiconductor Corporation Coupled inductor with improved leakage inductance control
US8174348B2 (en) 2009-12-21 2012-05-08 Volterra Semiconductor Corporation Two-phase coupled inductors which promote improved printed circuit board layout
US8237530B2 (en) 2009-08-10 2012-08-07 Volterra Semiconductor Corporation Coupled inductor with improved leakage inductance control
US8299885B2 (en) 2002-12-13 2012-10-30 Volterra Semiconductor Corporation Method for making magnetic components with M-phase coupling, and related inductor structures
US8330567B2 (en) 2010-01-14 2012-12-11 Volterra Semiconductor Corporation Asymmetrical coupled inductors and associated methods
WO2013061220A1 (en) 2011-10-25 2013-05-02 Brusa Elektronik Ag Inductive component and use
FR2982068A1 (en) * 2011-11-02 2013-05-03 Valeo Sys Controle Moteur Sas Electromagnetic device for use in electromagnetic actuator utilized for controlling e.g. injector, in car, has principal magnetic circuit, and secondary magnetic circuit allowing increase of leak inductance of coils
US8674802B2 (en) 2009-12-21 2014-03-18 Volterra Semiconductor Corporation Multi-turn inductors
US9019063B2 (en) 2009-08-10 2015-04-28 Volterra Semiconductor Corporation Coupled inductor with improved leakage inductance control
DE202020101764U1 (en) 2019-04-08 2020-06-28 Premo, S.A. Transformer used as a series inductor for ZVS or LLC resonance converters

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1439441A1 (en) * 1963-09-18 1968-12-05 Sits Soc It Telecom Siemens Low-loss coil winding for an inductance
US3480896A (en) * 1967-11-01 1969-11-25 Components Corp Adjustable inductor
EP0003396A1 (en) * 1978-02-01 1979-08-08 Imperial Chemical Industries Plc Control circuit for energizing an electrically ignited load

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1439441A1 (en) * 1963-09-18 1968-12-05 Sits Soc It Telecom Siemens Low-loss coil winding for an inductance
US3480896A (en) * 1967-11-01 1969-11-25 Components Corp Adjustable inductor
EP0003396A1 (en) * 1978-02-01 1979-08-08 Imperial Chemical Industries Plc Control circuit for energizing an electrically ignited load

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8299885B2 (en) 2002-12-13 2012-10-30 Volterra Semiconductor Corporation Method for making magnetic components with M-phase coupling, and related inductor structures
US8779885B2 (en) 2002-12-13 2014-07-15 Volterra Semiconductor Corporation Method for making magnetic components with M-phase coupling, and related inductor structures
US8836461B2 (en) 2002-12-13 2014-09-16 Volterra Semiconductor Corporation Method for making magnetic components with M-phase coupling, and related inductor structures
US7772955B1 (en) 2002-12-13 2010-08-10 Volterra Semiconductor Corporation Method for making magnetic components with N-phase coupling, and related inductor structures
US7864016B1 (en) 2002-12-13 2011-01-04 Volterra Semiconductor Corporation Method for making magnetic components with N-phase coupling, and related inductor structures
US7893806B1 (en) 2002-12-13 2011-02-22 Volterra Semiconductor Corporation Method for making magnetic components with N-phase coupling, and related inductor structures
US7965165B2 (en) 2002-12-13 2011-06-21 Volterra Semiconductor Corporation Method for making magnetic components with M-phase coupling, and related inductor structures
US9019064B2 (en) 2002-12-13 2015-04-28 Volterra Semiconductor Corporation Method for making magnetic components with M-phase coupling, and related inductor structures
US7746209B1 (en) 2002-12-13 2010-06-29 Volterra Semiconductor Corporation Method for making magnetic components with N-phase coupling, and related inductor structures
US9147515B2 (en) 2002-12-13 2015-09-29 Volterra Semiconductor LLC Method for making magnetic components with M-phase coupling, and related inductor structures
US8786395B2 (en) 2002-12-13 2014-07-22 Volterra Semiconductor Corporation Method for making magnetic components with M-phase coupling, and related inductor structures
DE10349401B3 (en) * 2003-10-21 2004-07-29 Grenzebach Bsh Gmbh Veneer drying plant with stacked drying zones in successive horizontal planes and separate control of temperature and/or humidity for each drying zone
US8294544B2 (en) 2008-03-14 2012-10-23 Volterra Semiconductor Corporation Method for making magnetic components with M-phase coupling, and related inductor structures
WO2009114872A1 (en) * 2008-03-14 2009-09-17 Volterra Semiconductor Corporation Magnetic components with m-phase coupling, and related inductor structures
US8836463B2 (en) 2008-03-14 2014-09-16 Volterra Semiconductor Corporation Voltage converter inductor having a nonlinear inductance value
US9627125B2 (en) 2008-03-14 2017-04-18 Volterra Semiconductor LLC Voltage converter inductor having a nonlinear inductance value
US8237530B2 (en) 2009-08-10 2012-08-07 Volterra Semiconductor Corporation Coupled inductor with improved leakage inductance control
US9019063B2 (en) 2009-08-10 2015-04-28 Volterra Semiconductor Corporation Coupled inductor with improved leakage inductance control
US8102233B2 (en) 2009-08-10 2012-01-24 Volterra Semiconductor Corporation Coupled inductor with improved leakage inductance control
US7994888B2 (en) 2009-12-21 2011-08-09 Volterra Semiconductor Corporation Multi-turn inductors
US8674802B2 (en) 2009-12-21 2014-03-18 Volterra Semiconductor Corporation Multi-turn inductors
US8890644B2 (en) 2009-12-21 2014-11-18 Volterra Semiconductor LLC Two-phase coupled inductors which promote improved printed circuit board layout
US8362867B2 (en) 2009-12-21 2013-01-29 Volterra Semicanductor Corporation Multi-turn inductors
US9281115B2 (en) 2009-12-21 2016-03-08 Volterra Semiconductor LLC Multi-turn inductors
US8174348B2 (en) 2009-12-21 2012-05-08 Volterra Semiconductor Corporation Two-phase coupled inductors which promote improved printed circuit board layout
US8330567B2 (en) 2010-01-14 2012-12-11 Volterra Semiconductor Corporation Asymmetrical coupled inductors and associated methods
WO2013061220A1 (en) 2011-10-25 2013-05-02 Brusa Elektronik Ag Inductive component and use
FR2982068A1 (en) * 2011-11-02 2013-05-03 Valeo Sys Controle Moteur Sas Electromagnetic device for use in electromagnetic actuator utilized for controlling e.g. injector, in car, has principal magnetic circuit, and secondary magnetic circuit allowing increase of leak inductance of coils
DE202020101764U1 (en) 2019-04-08 2020-06-28 Premo, S.A. Transformer used as a series inductor for ZVS or LLC resonance converters

Also Published As

Publication number Publication date
NL8303994A (en) 1985-06-03
JPS60216521A (en) 1985-10-30

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

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Effective date: 19851120

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18W Application withdrawn

Withdrawal date: 19860410

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Inventor name: HOEKSMA, GERBEN SIMON