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EP0225830A1 - Method for producing a magnetic circuit with a low magnetic-leakage field, in particular for a high-voltage transformer supplying a cathode ray tube - Google Patents

Method for producing a magnetic circuit with a low magnetic-leakage field, in particular for a high-voltage transformer supplying a cathode ray tube Download PDF

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Publication number
EP0225830A1
EP0225830A1 EP86402674A EP86402674A EP0225830A1 EP 0225830 A1 EP0225830 A1 EP 0225830A1 EP 86402674 A EP86402674 A EP 86402674A EP 86402674 A EP86402674 A EP 86402674A EP 0225830 A1 EP0225830 A1 EP 0225830A1
Authority
EP
European Patent Office
Prior art keywords
magnetic circuit
magnetic
air gap
circuits
voltage transformer
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
EP86402674A
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German (de)
French (fr)
Other versions
EP0225830B1 (en
Inventor
Joel Vincent
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.)
Orega Electronique et Mecanique
Original Assignee
Orega Electronique et Mecanique
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Publication of EP0225830A1 publication Critical patent/EP0225830A1/en
Application granted granted Critical
Publication of EP0225830B1 publication Critical patent/EP0225830B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F3/14—Constrictions; Gaps, e.g. air-gaps

Definitions

  • the present invention relates to a magnetic circuit with a weak radiated magnetic field, in particular for a high voltage transformer supplying a cathode ray tube.
  • High-voltage transformers such as those used to supply cathode ray tubes generally have an air gap of well-defined value in their ferrite magnetic circuit. This air gap radiates a magnetic field producing harmful effects on the cathode ray tube, and even on other circuits which can pick them up by antenna effect.
  • the present invention relates to a magnetic circuit for a high voltage transformer whose radiation produced by the air gap is reduced to a minimum value and whose effects on the surrounding components or circuits are negligible, this magnetic circuit being easy and inexpensive to produce. , in particular for mass production, the value of the inductance, and in particular of the primary inductance of the transformer, is easy to adjust with low tolerances.
  • the magnetic circuit according to the invention comprises an air gap housed inside a coil, the thickness of this air gap being determined during the manufacture of the magnetic circuit by rectification the ends of the legs of the two half-circuits, which are then glued together, on the side of the air gap with the interposition of a shim of thickness practically equal to the thickness of the air gap desired, made of non-magnetic material, and on the opposite side directly on top of each other.
  • the magnetic circuit described below is intended for a high voltage transformer supplying a cathode ray tube, but it is understood that the invention is not limited to such an application, and can be used as well when it is desired to reduce magnetic radiation from a transformer or an inductance, only when you want to adjust the inductance value of a winding placed on a magnetic circuit to a precise value.
  • the magnetic circuit 1 shown in the drawing comprises two half-circuits 2, 3, made of ferrite, in the shape of a "U".
  • the ends of the legs of the half-circuits 2 and 3 are referenced 4, 5 and 6, 7 respectively.
  • the ends 4 and 6 of the legs of the half-circuits 2, 3 must come into close contact with one another so as to leave only a very reduced air gap, the residual air gap having a thickness of less than 0.1 mm after assembly by gluing.
  • the necessary air gap is created, by shortening, preferably by the same value, that is to say by the value of half the thickness of the air gap, the lengths of the legs having ends 5 and 7 (it is assumed that at the start the two legs of each "U" have the same length).
  • the front faces of the ends 4 to 7 are rectified so that, on the one hand, the ends 4 and 6 allow a regular minimum residual air gap to persist, and so that the air gap of desired value is obtained between the ends 5 and 7.
  • a wedge 8 of non-magnetic material is bonded between the ends 5 and 7, the thickness of which is practically equal to that of the desired air gap, taking into account the adhesive joint, this wedge only playing mechanical role.
  • the shim 8 is made of magnetic material, with magnetic characteristics different from those of the half-circuits 2 and 3 and / or of section different from that of the legs of these circuits, in order to obtain other possibilities for adjusting the inductance values of the windings arranged on this magnetic circuit.
  • a winding 9 with one or more windings (transform mateur or inductance) surrounds the ends 5 and 7 and the wedge 8.
  • the assembly of parts 2 and 3 and of the shim 8 is done using glue of the cold-bonding type with quick setting, making it possible to obtain joints with a thickness of less than 0.1 mm. It is also possible to fix the winding carcass on the ends 5 and 7 with the same adhesive.

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  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Soft Magnetic Materials (AREA)
  • Regulation Of General Use Transformers (AREA)

Abstract

In order to reduce the magnetic field radiated by a high voltage transformer, the air gap is arranged inside the winding (9), a distance piece (8) providing for the mechanical rigidity of the magnetic circuit (2, 3) which is assembled by cold sticking. Application to television sets.

Description

La présente invention a pour objet un circuit magnétique à faible champ magnétique rayonné, en particulier pour un transfor­mateur haute tension alimentant un tube cathodique.The present invention relates to a magnetic circuit with a weak radiated magnetic field, in particular for a high voltage transformer supplying a cathode ray tube.

Les transformateurs haute tension tels que ceux utilisés pour alimenter des tubes cathodiques comportent généralement un entre­fer de valeur bien déterminée dans leur circuit magnétique en ferrite. Cet entrefer rayonne un champ magnétique produisant des effets néfastes sur le tube cathodique, et même sur d'autres circuits pouvant les capter par effet d'antenne.High-voltage transformers such as those used to supply cathode ray tubes generally have an air gap of well-defined value in their ferrite magnetic circuit. This air gap radiates a magnetic field producing harmful effects on the cathode ray tube, and even on other circuits which can pick them up by antenna effect.

La présente invention a pour objet un circuit magnétique pour transformateur haute tension dont les rayonnements produits par l'entrefer soient réduits à une valeur minimale et dont les effets sur les composants ou circuits environnants soient négligeables, ce circuit magnétique étant facile et peu onéreux à réaliser, en particulier pour une production en grande série, la valeur de l'inductance, et en particulier de l'inductance primaire du transfor­mateur étant facile à ajuster avec de faibles tolérances.The present invention relates to a magnetic circuit for a high voltage transformer whose radiation produced by the air gap is reduced to a minimum value and whose effects on the surrounding components or circuits are negligible, this magnetic circuit being easy and inexpensive to produce. , in particular for mass production, the value of the inductance, and in particular of the primary inductance of the transformer, is easy to adjust with low tolerances.

Le circuit magnétique conforme à l'invention, du type à deux demi-circuits en "U", comporte un entrefer logé à l'intérieur d'un bobinage, l'épaisseur de cet entrefer étant déterminée à la fabri­cation du circuit magnétique par rectification des extrémités des jambes des deux demi-circuits, qui sont ensuite collées ensemble, du côté de l'entrefer avec interposition d'une cale d'épaisseur prati­quement égale à l'épaisseur d'entrefer désirée, en matériau amagné­tique, et du côté opposé directement l'une sur l'autre.The magnetic circuit according to the invention, of the type with two "U" half-circuits, comprises an air gap housed inside a coil, the thickness of this air gap being determined during the manufacture of the magnetic circuit by rectification the ends of the legs of the two half-circuits, which are then glued together, on the side of the air gap with the interposition of a shim of thickness practically equal to the thickness of the air gap desired, made of non-magnetic material, and on the opposite side directly on top of each other.

La présente invention sera mieux comprise à la lecture de la description détaillée d'un mode de réalisation pris comme exemple non limitatif et illustré par le dessin annexé, dont la figure unique est une vue en coupe simplifiée d'un circuit magnétique conforme à l'invention.The present invention will be better understood on reading the detailed description of an embodiment taken as a nonlimiting example and illustrated by the appended drawing, the single figure of which is a simplified sectional view of a magnetic circuit according to invention.

Le circuit magnétique décrit ci-dessous est destiné à un transformateur haute tension alimentant un tube cathodique, mais il est bien entendu que l'invention n'est pas limitée à une telle application, et peut être utilisée aussi bien lorsque l'on désire réduire les rayonnements magnétiques d'un transformateur ou d'une inductance, que lorsque l'on désire régler à une valeur précise la valeur d'inductance d'un enroulement disposé sur un circuit magné­tique.The magnetic circuit described below is intended for a high voltage transformer supplying a cathode ray tube, but it is understood that the invention is not limited to such an application, and can be used as well when it is desired to reduce magnetic radiation from a transformer or an inductance, only when you want to adjust the inductance value of a winding placed on a magnetic circuit to a precise value.

Le circuit magnétique 1 représenté sur le dessin comporte deux demi-circuits 2, 3, en ferrite, en forme de "U". Les extrémités des jambes des demi-circuits 2 et 3 sont référencées 4, 5 et 6, 7 respectivement. Les extrémités 4 et 6 des jambes des demi-circuits 2, 3 doivent venir en contact étroit l'une contre l'autre pour ne laisser subsister qu'un entrefer très réduit, l'entrefer résiduel ayant une épaisseur inférieure à 0,1 mm après assemblage par collage.The magnetic circuit 1 shown in the drawing comprises two half-circuits 2, 3, made of ferrite, in the shape of a "U". The ends of the legs of the half-circuits 2 and 3 are referenced 4, 5 and 6, 7 respectively. The ends 4 and 6 of the legs of the half-circuits 2, 3 must come into close contact with one another so as to leave only a very reduced air gap, the residual air gap having a thickness of less than 0.1 mm after assembly by gluing.

Entre les extrémités 5, 7, on crée l'entrefer nécessaire, en raccourcissant, de préférence de la même valeur, c'est-à-dire de la valeur de la moitié de l'épaisseur de l'entrefer, les longueurs des jambes ayant pour extrémités 5 et 7 (on suppose qu'au départ les deux jambes de chaque "U" ont la même longueur). Les faces frontales des extrémités 4 à 7 sont rectifiées pour que, d'une part les extrémités 4 et 6 laissent susbsister un entrefer résiduel minimal régulier, et pour que l'on obtienne entre les extrémités 5 et 7 l'entrefer de valeur désirée.Between the ends 5, 7, the necessary air gap is created, by shortening, preferably by the same value, that is to say by the value of half the thickness of the air gap, the lengths of the legs having ends 5 and 7 (it is assumed that at the start the two legs of each "U" have the same length). The front faces of the ends 4 to 7 are rectified so that, on the one hand, the ends 4 and 6 allow a regular minimum residual air gap to persist, and so that the air gap of desired value is obtained between the ends 5 and 7.

Pour obtenir un assemblage solide, on colle entre les extré­mités 5 et 7 une cale 8 en matériau amagnétique, dont l'épaisseur est pratiquement égale à celle de l'entrefer désiré, compte tenu du joint de colle, cette cale ne jouant qu'un rôle mécanique.To obtain a solid assembly, a wedge 8 of non-magnetic material is bonded between the ends 5 and 7, the thickness of which is practically equal to that of the desired air gap, taking into account the adhesive joint, this wedge only playing mechanical role.

Selon une variante de l'invention, la cale 8 est en matériau magnétique, de caractéristiques magnétiques différentes de celles des demi-circuits 2 et 3 et/ou de section différente de celle des jambes de ces circuits, afin d'obtenir d'autres possibilités de réglage des valeurs d'inductance des enroulements disposés sur ce circuit magnétique. Un bobinage 9 à un ou plusieurs enroulements (transfor­ mateur ou inductance) entoure les extrémités 5 et 7 et la cale 8.According to a variant of the invention, the shim 8 is made of magnetic material, with magnetic characteristics different from those of the half-circuits 2 and 3 and / or of section different from that of the legs of these circuits, in order to obtain other possibilities for adjusting the inductance values of the windings arranged on this magnetic circuit. A winding 9 with one or more windings (transform mateur or inductance) surrounds the ends 5 and 7 and the wedge 8.

De préférence, l'assemblage des parties 2 et 3 et de la cale 8 est fait à l'aide de colle du type à collage à froid avec prise rapide, permettant d'obtenir des joints d'épaisseur inférieure à 0,1 mm. On peut également fixer avec la même colle la carcasse du bobinage sur les extrémités 5 et 7.Preferably, the assembly of parts 2 and 3 and of the shim 8 is done using glue of the cold-bonding type with quick setting, making it possible to obtain joints with a thickness of less than 0.1 mm. It is also possible to fix the winding carcass on the ends 5 and 7 with the same adhesive.

Dans le cas de la réalisation d'un transformateur haute tension alimentant un tube cathodique, on a constaté que la valeur d'induc­tance du bobinage primaire d'un tel transformateur était critique, la tolérance devant être inférieure ou égale à 8%, ce que l'on ne pouvait obtenir que difficilement avec les procédés de l'art anté­rieur, consistant à ajuster l'épaisseur de l'entrefer individuellement pour chaque transformateur.In the case of producing a high voltage transformer supplying a cathode ray tube, it has been found that the inductance value of the primary winding of such a transformer is critical, the tolerance having to be less than or equal to 8%, which it was difficult to obtain with the methods of the prior art, consisting in adjusting the thickness of the air gap individually for each transformer.

Par contre, selon la présente invention, il suffit, pour une même série de transformateurs ou d'inductances, d'usiner les jambes des demi-circuits 2 et 3 toujours aux mêmes longueurs, ces demi-­circuits étant assemblés automatiquement avec la cale 8 et le bobinage 9, pour ne plus avoir à ajuster après assemblage l'épaisseur d'entrefer, en respectant facilement les tolérances fixées pour la valeur d'inductance.On the other hand, according to the present invention, it suffices, for the same series of transformers or inductors, to machine the legs of the half-circuits 2 and 3 always at the same lengths, these half-circuits being assembled automatically with the shim 8 and the winding 9, so as not to have to adjust after assembly the gap thickness, easily respecting the tolerances set for the inductance value.

Par ailleurs, on a constaté une forte diminution du champ rayonné par le circuit de l'invention. On peut par exemple mesurer ce champ en un point 10 situé à une distance d (par exemple 1 cm) du circuit, sur le plan de joint des extrémités 4 et 6. Cette diminution peut être dans un rapport d'environ 3.Furthermore, there has been a sharp decrease in the field radiated by the circuit of the invention. One can for example measure this field at a point 10 located at a distance d (for example 1 cm) from the circuit, on the joint plane of the ends 4 and 6. This reduction can be in a ratio of approximately 3.

Claims (6)

1. Circuit magnétique à faible champ magnétique rayonné, en particulier pour un transformateur haute tension alimentant un tube cathodique, du type à deux demi-circuits en "U" (2, 3), caractérisé par le fait qu'il comporte un entrefer (5, 7) logé à l'intérieur d'un bobinage (9), l'épaisseur de cet entrefer étant déterminée à la fabrication du circuit magnétique par rectification des extrémités (4 à 7) des jambes des deux demi-circuits.1. Magnetic circuit with a weak radiated magnetic field, in particular for a high voltage transformer supplying a cathode ray tube, of the type with two "U" half-circuits (2, 3), characterized in that it comprises an air gap ( 5, 7) housed inside a coil (9), the thickness of this air gap being determined during the manufacture of the magnetic circuit by rectification of the ends (4 to 7) of the legs of the two half-circuits. 2. Circuit magnétique selon la revendication 1, caractérisé par le fait que les extrémités des jambes des deux demi-circuits magnétiques sont, à l'assemblage, collées ensemble, du côté de l'entrefer avec interposition d'une cale (8) d'épaisseur pratiquement égale à l'épaisseur d'entrefer désirée, et du côté opposé (4, 6) directement l'une sur l'autre.2. Magnetic circuit according to claim 1, characterized in that the ends of the legs of the two magnetic half-circuits are, when assembled, glued together, on the side of the air gap with the interposition of a shim (8) d 'thickness practically equal to the desired gap thickness, and on the opposite side (4, 6) directly one over the other. 3. Circuit magnétique selon la revendication 2, caractérisé par le fait que la cale est en matériau amagnétique.3. Magnetic circuit according to claim 2, characterized in that the shim is made of non-magnetic material. 4. Circuit magnétique selon la revendication 2, caractérisé par le fait que la cale est un matériau magnétique, de caractéristiques magnétiques différentes de celles du matériau du circuit magné­tique.4. Magnetic circuit according to claim 2, characterized in that the shim is a magnetic material, with magnetic characteristics different from those of the material of the magnetic circuit. 5. Circuit magnétique selon l'une des revendications 2 à 4, caractérisé par le fait que la section de la cale est différente de celle des jambes du circuit magnétique.5. Magnetic circuit according to one of claims 2 to 4, characterized in that the section of the shim is different from that of the legs of the magnetic circuit. 6. Circuit magnétique selon l'une des revendications 2 à 5, caractérisé par le fait que l'on utilise pour l'assemblage une colle du type à collage à froid à prise rapide.6. Magnetic circuit according to one of claims 2 to 5, characterized in that one uses for the assembly an adhesive of the cold setting type with quick setting.
EP86402674A 1985-12-04 1986-12-02 Method for producing a magnetic circuit with a low magnetic-leakage field, in particular for a high-voltage transformer supplying a cathode ray tube Expired - Lifetime EP0225830B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8517948A FR2591024B1 (en) 1985-12-04 1985-12-04 LOW MAGNETIC RADIUS MAGNETIC CIRCUIT, PARTICULARLY FOR A HIGH VOLTAGE TRANSFORMER SUPPLYING A CATHODE RAY TUBE
FR8517948 1985-12-04

Publications (2)

Publication Number Publication Date
EP0225830A1 true EP0225830A1 (en) 1987-06-16
EP0225830B1 EP0225830B1 (en) 1993-03-31

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ID=9325439

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86402674A Expired - Lifetime EP0225830B1 (en) 1985-12-04 1986-12-02 Method for producing a magnetic circuit with a low magnetic-leakage field, in particular for a high-voltage transformer supplying a cathode ray tube

Country Status (6)

Country Link
EP (1) EP0225830B1 (en)
JP (1) JPS63502149A (en)
DE (1) DE3688181T2 (en)
ES (1) ES2039358T3 (en)
FR (1) FR2591024B1 (en)
WO (1) WO1987003736A1 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0471864A1 (en) * 1990-08-17 1992-02-26 TDK Corporation Coil device
DE19528185A1 (en) * 1995-08-01 1997-02-06 Thomson Brandt Gmbh transformer
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
US7898379B1 (en) 2002-12-13 2011-03-01 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
US8102233B2 (en) 2009-08-10 2012-01-24 Volterra Semiconductor Corporation Coupled inductor with improved leakage inductance control
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

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009064990A (en) * 2007-09-07 2009-03-26 Sht Corp Ltd Coil unit
US9019063B2 (en) 2009-08-10 2015-04-28 Volterra Semiconductor Corporation Coupled inductor with improved leakage inductance control
CN105719825A (en) * 2016-01-22 2016-06-29 深圳顺络电子股份有限公司 Inductor and fabrication method thereof

Citations (4)

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DE2927182A1 (en) * 1979-07-05 1981-01-08 Licentia Gmbh Line transformer core butt joints - bonded by two plastics adhesives of specified different properties
DE3040368A1 (en) * 1980-10-25 1982-05-27 Vogt Gmbh & Co Kg, 8391 Erlau Ferromagnetic core with filled air gap - uses lower permeability compacted iron powder in gaps of ferromagnetic cores
FR2500679A3 (en) * 1981-02-20 1982-08-27 Orega Cifte Transformer mfg. method for line scan circuit of TV receiver - has gap of magnetic core adjusted by use of predetermined amount of hardening glue and coil impedance measurement
DE3402278A1 (en) * 1984-01-24 1985-08-01 Vogt Gmbh & Co Kg, 8391 Erlau Trimmable E-core for inductors

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JPS5952812A (en) * 1982-09-20 1984-03-27 Matsushita Electric Ind Co Ltd Fly-back transformer
JPS59168608A (en) * 1983-03-14 1984-09-22 Murata Mfg Co Ltd Manufacture of fly-back transformer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2927182A1 (en) * 1979-07-05 1981-01-08 Licentia Gmbh Line transformer core butt joints - bonded by two plastics adhesives of specified different properties
DE3040368A1 (en) * 1980-10-25 1982-05-27 Vogt Gmbh & Co Kg, 8391 Erlau Ferromagnetic core with filled air gap - uses lower permeability compacted iron powder in gaps of ferromagnetic cores
FR2500679A3 (en) * 1981-02-20 1982-08-27 Orega Cifte Transformer mfg. method for line scan circuit of TV receiver - has gap of magnetic core adjusted by use of predetermined amount of hardening glue and coil impedance measurement
DE3402278A1 (en) * 1984-01-24 1985-08-01 Vogt Gmbh & Co Kg, 8391 Erlau Trimmable E-core for inductors

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0471864A1 (en) * 1990-08-17 1992-02-26 TDK Corporation Coil device
DE19528185A1 (en) * 1995-08-01 1997-02-06 Thomson Brandt Gmbh transformer
US7893806B1 (en) 2002-12-13 2011-02-22 Volterra Semiconductor Corporation Method for making magnetic components with N-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
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
US7898379B1 (en) 2002-12-13 2011-03-01 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
US8299885B2 (en) 2002-12-13 2012-10-30 Volterra Semiconductor Corporation Method for making magnetic components with M-phase coupling, and related inductor structures
US8350658B1 (en) 2002-12-13 2013-01-08 Volterra Semiconductor Corporation Method for making magnetic components with N-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
US8294544B2 (en) 2008-03-14 2012-10-23 Volterra Semiconductor Corporation Method for making magnetic components with M-phase coupling, and related inductor structures
US8102233B2 (en) 2009-08-10 2012-01-24 Volterra Semiconductor Corporation Coupled inductor with improved leakage inductance control
US8237530B2 (en) 2009-08-10 2012-08-07 Volterra Semiconductor Corporation Coupled inductor with improved leakage inductance control

Also Published As

Publication number Publication date
WO1987003736A1 (en) 1987-06-18
DE3688181D1 (en) 1993-05-06
FR2591024B1 (en) 1988-01-08
DE3688181T2 (en) 1993-07-08
ES2039358T3 (en) 1993-10-01
EP0225830B1 (en) 1993-03-31
JPS63502149A (en) 1988-08-18
FR2591024A1 (en) 1987-06-05

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