EP0390643B1 - Transformer of the closed ferrite magnetic circuit type - Google Patents
Transformer of the closed ferrite magnetic circuit type Download PDFInfo
- Publication number
- EP0390643B1 EP0390643B1 EP90400760A EP90400760A EP0390643B1 EP 0390643 B1 EP0390643 B1 EP 0390643B1 EP 90400760 A EP90400760 A EP 90400760A EP 90400760 A EP90400760 A EP 90400760A EP 0390643 B1 EP0390643 B1 EP 0390643B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- transformer
- magnetic circuit
- air gap
- ferrite magnetic
- circuit type
- 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.)
- Expired - Lifetime
Links
- 229910000859 α-Fe Inorganic materials 0.000 title claims description 10
- 229920001021 polysulfide Polymers 0.000 claims description 8
- 239000013521 mastic Substances 0.000 claims description 6
- 235000011837 pasties Nutrition 0.000 claims description 2
- 240000005428 Pistacia lentiscus Species 0.000 claims 4
- 230000001747 exhibiting effect Effects 0.000 claims 1
- 229920002635 polyurethane Polymers 0.000 claims 1
- 239000004814 polyurethane Substances 0.000 claims 1
- 238000004804 winding Methods 0.000 description 8
- 239000000565 sealant Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000003292 glue Substances 0.000 description 4
- 239000004588 polyurethane sealant Substances 0.000 description 4
- 229920001296 polysiloxane Polymers 0.000 description 3
- 150000008117 polysulfides Polymers 0.000 description 3
- 206010041235 Snoring Diseases 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000379 polymerizing effect Effects 0.000 description 2
- 239000004587 polysulfide sealant Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000005077 polysulfide Substances 0.000 description 1
Images
Classifications
-
- 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 transformer with a closed ferrite magnetic circuit comprising an air gap, more particularly a transformer of the above type used in switching power supplies.
- a type of transformer for switching power supply consists of a magnetic circuit consisting of two ferrite half-circuits having in section an "E" shape and of a winding carcass carrying a coil comprising one or more several electrically separated windings.
- the winding carcass is provided with an axial hole into which the central legs of the "E" are inserted.
- the magnetic circuit and the winding carcass are assembled by gluing.
- one of the ferrite half-circuits is bonded to the winding carcass, then the two magnetic half-circuits are assembled together by bonding the facing faces of the outer legs of the circuits.
- An air gap is therefore obtained between the inner legs.
- the air gap easily absorbs the mechanical stresses caused in particular by thermal shock according to the constraints imposed by the standards in force.
- the air gap when the air gap is an air gap, it generates magnetostrictive phenomena which result in audible snoring in the transformer, magnetostriction being a phenomenon of elastic deformation linked to magnetization, that is to say that characteristics of the ferrite vary according to the magnetic induction.
- the present invention therefore aims to remedy the above drawbacks by proposing a new material.
- the subject of the present invention is a transformer of the closed magnetic ferrite circuit type comprising an air gap, characterized in that the air gap is filled with a single-component mastic having a Shore hardness having a constant behavior as a function of the temperature.
- the putty has a Shore hardness of 30 to 25 ° C.
- the single-component sealant is chosen from polysulphide or polyurethane sealants.
- the putty used is a polysulphide putty.
- Single-component sealants such as polysulfide or polyurethane sealants have the advantage of being self-adhesive, of being flexible enough to absorb vibrations and, on the other hand, of polymerizing without shrinking over time.
- a transformer 1 for switching power supply comprises a magnetic circuit consisting of two ferrite half-circuits 2, 3 having in section a shape of "E".
- the lower magnetic half-circuit 3 has an inner leg or central leg 9 shorter than the two outer legs.
- the transformer 1 also includes a winding carcass 4.
- This carcass carries a coil 5 comprising one or more electrically separate windings.
- the magnetic circuit and the coil carcass are assembled by gluing as explained below.
- the bonding of the magnetic circuit with respect to the carcass 4 consists of depositing glue on the outer face of a cheek 12 of the carcass 4. This cheek 12 is that which is on the side of the lower magnetic half-circuit 3 and the 'base 13 for fixing the transformer and electrical connection of these windings.
- the glue dots 12a and 12b therefore make it possible to secure the magnetic circuit 3 and the carcass 4.
- glue dots are deposited in the spaces 10, 11 between the facing faces of the outer legs of the magnetic circuits 2, 3 so to secure the two magnetic circuits.
- the air gap 6 between the inner legs 8, 9 is then constituted by air. This type of air gap absorbs the mechanical stresses due to thermal shock. As a result, there is no longer any risk of cracking of the ferrites. However, this air gap generates magnetostriction noises which result in audible snoring, which is particularly annoying.
- the air gap determined by the legs 8 and 9 is filled with an absorbent material 15 as shown in FIG. 2.
- This material 15 consists of a single-component sealant with a Shore hardness of around 30 ShA at 25 ° C. This Shore hardness also has a constant behavior as a function of temperature.
- the one-component sealant is chosen from polysulfide or polyurethane sealants.
- a polysulphide sealant is used which currently has the advantage of having greater flexibility than polyurethane sealants.
- Polysulfide mastic also has the advantage of being a good heat sink, which allows the calories generated at the air gap to be removed with better efficiency than in the case of an air air gap.
- the putty sold by CIBA-GEIGY under the name of ARA joint PRC was used as polysulphide mastic.
- This putty was deposited in an air gap having a width of 0.8 mm in the form of a pasty drop of 0.4 to 0.7 gram.
- This type of sealant has the advantage of polymerizing without significant shrinkage over time.
- This paste was deposited before assembly of the two magnetic half-circuits 2 by the glue dots 10 and 11, as in the case of FIG. 1.
Landscapes
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Or Transformers For Communication (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
- Magnetic Treatment Devices (AREA)
- Insulating Of Coils (AREA)
- Housings And Mounting Of Transformers (AREA)
- Transformers For Measuring Instruments (AREA)
- Soft Magnetic Materials (AREA)
Description
La présente invention concerne un transformateur à circuit magnétique fermé en ferrite comportant un entrefer, plus particulièrement un transformateur du type ci-dessus utilisé dans les alimentations à découpage.The present invention relates to a transformer with a closed ferrite magnetic circuit comprising an air gap, more particularly a transformer of the above type used in switching power supplies.
En effet, les alimentations à découpage fonctionnant en mode à accumulation ou "flyback" nécessitent un stockage d'énergie dans le circuit magnétique en ferrite d'un transformateur avant transfert de cette énergie vers le circuit électrique branché en aval du transformateur. Ce stockage d'énergie impose l'utilisation d'un circuit magnétique à entrefer. De manière classique, un type de transformateur pour alimentation à découpage est constitué d'un circuit magnétique se composant de deux demi-circuits en ferrite ayant en coupe une forme de "E" et d'une carcasse de bobinage portant une bobine comportant un ou plusieurs enroulements électriquement séparés. La carcasse de bobinage est munie d'un trou axial dans lequel viennent s'insérer les jambes centrales des "E". L'assemblage du circuit magnétique et de la carcasse de bobinage se fait par collage. De préférence, un des demi-circuits en ferrite est collé sur la carcasse de bobinage, puis les deux demi-circuits magnétiques sont assemblés ensemble par collage des faces en regard des jambes extérieures des circuits. On obtient donc entre les jambes intérieures un entrefer à air. Un tel assemblage garantit une bonne tenue mécanique du circuit magnétique et de la bobine. En effet, l'entrefer à air absorbe facilement les contraintes mécaniques provoquées notamment par les chocs thermiques selon les contraintes imposées par les normes en vigueur. Toutefois, lorsque l'entrefer est un entrefer à air, il génère des phénomènes magnétostrictifs qui se traduisent par des ronflements audibles dans le transformateur, la magnétostriction étant un phénomène de déformation élastique liée à l'aimantation, c'est-à-dire que les caractéristiques géométriques du ferrite varient en fonction de l'induction magnétique.Indeed, switching power supplies operating in accumulation or "flyback" mode require energy storage in the ferrite magnetic circuit of a transformer before transfer of this energy to the electrical circuit connected downstream of the transformer. This energy storage requires the use of a magnetic circuit to be gap. Typically, a type of transformer for switching power supply consists of a magnetic circuit consisting of two ferrite half-circuits having in section an "E" shape and of a winding carcass carrying a coil comprising one or more several electrically separated windings. The winding carcass is provided with an axial hole into which the central legs of the "E" are inserted. The magnetic circuit and the winding carcass are assembled by gluing. Preferably, one of the ferrite half-circuits is bonded to the winding carcass, then the two magnetic half-circuits are assembled together by bonding the facing faces of the outer legs of the circuits. An air gap is therefore obtained between the inner legs. Such an assembly guarantees good mechanical strength of the magnetic circuit and of the coil. Indeed, the air gap easily absorbs the mechanical stresses caused in particular by thermal shock according to the constraints imposed by the standards in force. However, when the air gap is an air gap, it generates magnetostrictive phenomena which result in audible snoring in the transformer, magnetostriction being a phenomenon of elastic deformation linked to magnetization, that is to say that characteristics of the ferrite vary according to the magnetic induction.
Pour remédier à ces inconvénients, on a proposé dans la demande de brevet français N°87 15202 déposée le 3 Novembre 1987, au nom de la Demanderesse, de disposer dans l'entrefer des jambes centrales un matériau de la famille des silicones. Si ce matériau a donné des résultats satisfaisants pour des fréquences fixes, il n'en est pas de même lorsque le transformateur doit travailler à des fréquences variables. D'autre part, les silicones qui doivent être utilisés sont des silicones neutres qui présentent le défaut d'être peu adhérents.To remedy these drawbacks, it has been proposed in French patent application No. 87 15202 filed on November 3, 1987, in the name of the Applicant, to have a material from the family of silicones in the air gap of the central legs. If this material has given satisfactory results for fixed frequencies, it is not the same when the transformer must work at variable frequencies. On the other hand, the silicones which must be used are neutral silicones which have the defect of being poorly adherent.
La présente invention a donc pour but de remédier aux inconvénients ci-dessus en proposant un nouveau matériau.The present invention therefore aims to remedy the above drawbacks by proposing a new material.
En conséquence, la présente invention a pour objet un transformateur du type à circuit magnétique fermé en ferrite comportant un entrefer, caractérisé en ce que l'entrefer est rempli par un mastic monocomposant présentant une dureté Shore ayant un comportement constant en fonction de la température. De préférence, le mastic présente une dureté Shore de 30 à 25°C.Consequently, the subject of the present invention is a transformer of the closed magnetic ferrite circuit type comprising an air gap, characterized in that the air gap is filled with a single-component mastic having a Shore hardness having a constant behavior as a function of the temperature. Preferably, the putty has a Shore hardness of 30 to 25 ° C.
Selon un mode de réalisation préférentiel, le mastic monocomposant est choisi parmi les mastics polysulfure ou polyuréthane. De préférence le mastic utilisé est un mastic polysulfure.According to a preferred embodiment, the single-component sealant is chosen from polysulphide or polyurethane sealants. Preferably the putty used is a polysulphide putty.
Les mastics monocomposants tels que les mastics polysulfure ou polyuréthane présentent l'avantage d'être auto-adhérents, d'être suffisamment souples pour amortir les vibrations et d'autre part de polymériser sans retrait dans le temps.Single-component sealants such as polysulfide or polyurethane sealants have the advantage of being self-adhesive, of being flexible enough to absorb vibrations and, on the other hand, of polymerizing without shrinking over time.
D'autres caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description faite ci-après d'un mode de réalisation préférentiel pris comme exemple non limitatif et illustré par le dessin ci-annexé dans lequel :
- la figure 1 est une vue en coupe d'un transformateur à circuit magnétique en double "E" réalisé selon la technique de l'art antérieur, et
- la figure 2 est une vue en coupe d'un transformateur du type de celui de la figure 1 réalisé selon un mode de réalisation de l'invention.
- Figure 1 is a sectional view of a double magnetic circuit transformer "E" produced according to the technique of the art anterior, and
- Figure 2 is a sectional view of a transformer of the type of that of Figure 1 produced according to an embodiment of the invention.
Comme représenté sur la figure 1, un transformateur 1 pour alimentation à découpage comporte un circuit magnétique se composant de deux demi-circuits en ferrite 2, 3 ayant en coupe une forme de "E". Le demi-circuit magnétique inférieur 3 comporte une jambe intérieure ou jambe centrale 9 plus courte que les deux jambes extérieures. Le transformateur 1 comporte aussi une carcasse 4 de bobinage. Cette carcasse porte une bobine 5 comportant un ou plusieurs enroulements électriquement séparés. L'assemblage du circuit magnétique et de la carcasse de la bobine est réalisé par collage comme expliqué ci-après. Le collage du circuit magnétique par rapport à la carcasse 4 consiste à déposer de la colle sur la face extérieure d'une joue 12 de la carcasse 4. Cette joue 12 est celle qui est du côté du demi-circuit magnétique inférieure 3 et de l'embase 13 de fixation du transformateur et de raccordement électrique de ces enroulements. Les points de colle 12a et 12b permettent donc de solidariser le circuit magnétique 3 et la carcasse 4. Ensuite, des points de colle sont déposés dans les espaces 10, 11 entre les faces en regard des jambes extérieures des circuits magnétiques 2, 3 de manière à solidariser les deux circuits magnétiques. Dans ce cas, l'entrefer 6 entre les jambes intérieures 8, 9 est alors constitué par de l'air. Ce type d'entrefer absorbe les contraintes mécaniques dues au choc thermique. De ce fait, il n'y a plus risque de fissurations des ferrites. Cependant, cet entrefer à air génère des bruits de magnétostriction qui se traduisent par des ronflements audibles, ronflements qui sont particulièrement gênants.As shown in Figure 1, a
Conformément à la présente invention et pour diminuer très sensiblement ces bruits de magnétostriction, on remplit l'entrefer déterminé par les jambes 8 et 9 d'un matériau absorbeur 15 comme représenté sur la figure 2. Ce matériau 15 est constitué par un mastic monocomposant présentant une dureté Shore d'environ 30 ShA à 25°C. Cette dureté Shore a de plus un comportement constant en fonction de la température. En fait, le mastic monocomposant est choisi parmi les mastics polysulfure ou polyuréthane. De préférence, on utilise un mastic polysulfure qui présente l'avantage actuellement d'avoir une plus grande souplesse que les mastics polyuréthane. Le mastic polysulfure présente aussi l'avantage d'être un bon dissipateur thermique ce qui permet d'évacuer les calories générées au niveau de l'entrefer avec un meilleur rendement que dans le cas d'un entrefer à air.In accordance with the present invention and in order to very substantially reduce these magnetostriction noises, the air gap determined by the
A titre d'exemple, on a utilisé comme mastic polysulfure le mastic vendu par CIBA-GEIGY sous le nom de ARA joint PRC. Ce mastic a été déposé dans un entrefer présentant une largeur de 0,8 mm sous forme d'une goutte pâteuse de 0,4 à 0,7 gramme. Ce type de mastic présente l'avantage de polymériser sans retrait notable dans le temps. Cette pâte a été déposée avant assemblage des deux demi-circuits magnétiques 2 par les points de colle 10 et 11, comme dans le cas de la figure 1.By way of example, the putty sold by CIBA-GEIGY under the name of ARA joint PRC was used as polysulphide mastic. This putty was deposited in an air gap having a width of 0.8 mm in the form of a pasty drop of 0.4 to 0.7 gram. This type of sealant has the advantage of polymerizing without significant shrinkage over time. This paste was deposited before assembly of the two magnetic half-
Claims (4)
- Transformer of the type with closed magnetic circuit (2, 3) made of ferrite including an air gap (6), characterised in that the air gap (6) is filled with a single-component mastic (15) exhibiting a Shore hardness having a constant behaviour as a function of the temperature.
- Transformer according to Claim 1, characterised in that the Shore hardness is 30 Shore A at 25°C.
- Transformer according to Claims 1 and 2, characterised in that the single-component mastic is chosen from polysulphide or polyurethane mastics.
- Transformer according to any one of Claims 1 to 3, characterised in that the single-component mastic is deposited in the pasty state.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8903985A FR2645336B1 (en) | 1989-03-28 | 1989-03-28 | CLOSED TO FERRITE MAGNETIC CIRCUIT TYPE TRANSFORMER |
FR8903985 | 1989-03-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0390643A1 EP0390643A1 (en) | 1990-10-03 |
EP0390643B1 true EP0390643B1 (en) | 1994-04-20 |
Family
ID=9380095
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90400760A Expired - Lifetime EP0390643B1 (en) | 1989-03-28 | 1990-03-20 | Transformer of the closed ferrite magnetic circuit type |
Country Status (7)
Country | Link |
---|---|
US (1) | US5025241A (en) |
EP (1) | EP0390643B1 (en) |
JP (1) | JP2945061B2 (en) |
DE (1) | DE69008226T2 (en) |
ES (1) | ES2051480T3 (en) |
FR (1) | FR2645336B1 (en) |
HK (1) | HK26095A (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2714206B1 (en) | 1993-12-21 | 1996-03-01 | Thomson Television Components | Improvement to transformers of the closed magnetic ferrite circuit type. |
FR2740259B1 (en) * | 1995-10-24 | 1997-11-07 | Thomson Csf | MIXED MAGNETIC CORE |
US6650217B1 (en) * | 1997-03-07 | 2003-11-18 | Koninklijke Philips Electronics N.V. | Low profile magnetic component with planar winding structure having reduced conductor loss |
EP1049113A3 (en) * | 1999-04-26 | 2001-01-17 | Artesyn Technologies | Improvements in and relating to magnetic devices |
WO2001086795A1 (en) * | 2000-05-11 | 2001-11-15 | Sony Corporation | Switching power supply |
JP3680747B2 (en) * | 2001-03-09 | 2005-08-10 | ソニー株式会社 | Switching power supply circuit |
JP2011077304A (en) * | 2009-09-30 | 2011-04-14 | Fdk Corp | Inductance component for large power |
JP2012119454A (en) * | 2010-11-30 | 2012-06-21 | Sumitomo Electric Ind Ltd | Reactor |
JP5690572B2 (en) * | 2010-12-14 | 2015-03-25 | 株式会社日本自動車部品総合研究所 | Trance |
DE102011116861A1 (en) * | 2011-10-25 | 2013-04-25 | Epcos Ag | Electronic component for guiding a magnetic field |
JP6170390B2 (en) * | 2013-09-13 | 2017-07-26 | 株式会社タムラ製作所 | Power supply module parts |
US20160126829A1 (en) * | 2014-11-05 | 2016-05-05 | Chicony Power Technology Co., Ltd. | Inductor and power factor corrector using the same |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0315527A1 (en) * | 1987-11-03 | 1989-05-10 | OREGA ELECTRONIQUE & MECANIQUE | Transformer with a magnetic ferrite circuit resistant to thermal shocks |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2554262A (en) * | 1945-03-15 | 1951-05-22 | Westinghouse Electric Corp | Laminated metal |
US2937352A (en) * | 1953-04-23 | 1960-05-17 | Gen Electric | Magnetic core structure |
US3028570A (en) * | 1958-05-19 | 1962-04-03 | Western Union Telegraph Co | Ferrite inductance cores |
US3195086A (en) * | 1962-05-16 | 1965-07-13 | Western Union Telegraph Co | Temperature compensated inductor |
DE2927182C2 (en) * | 1979-07-05 | 1982-09-02 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Method for producing a transformer, in particular a line transformer for a television receiver |
JPS5726833U (en) * | 1980-07-21 | 1982-02-12 | ||
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 |
JPS59131125U (en) * | 1983-02-21 | 1984-09-03 | 東洋電機製造株式会社 | stationary inductor |
-
1989
- 1989-03-28 FR FR8903985A patent/FR2645336B1/en not_active Expired - Lifetime
-
1990
- 1990-02-16 US US07/480,763 patent/US5025241A/en not_active Expired - Lifetime
- 1990-03-20 DE DE69008226T patent/DE69008226T2/en not_active Expired - Lifetime
- 1990-03-20 ES ES90400760T patent/ES2051480T3/en not_active Expired - Lifetime
- 1990-03-20 EP EP90400760A patent/EP0390643B1/en not_active Expired - Lifetime
- 1990-03-28 JP JP2080581A patent/JP2945061B2/en not_active Expired - Lifetime
-
1995
- 1995-03-02 HK HK26095A patent/HK26095A/en not_active IP Right Cessation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0315527A1 (en) * | 1987-11-03 | 1989-05-10 | OREGA ELECTRONIQUE & MECANIQUE | Transformer with a magnetic ferrite circuit resistant to thermal shocks |
Also Published As
Publication number | Publication date |
---|---|
FR2645336A1 (en) | 1990-10-05 |
ES2051480T3 (en) | 1994-06-16 |
EP0390643A1 (en) | 1990-10-03 |
JP2945061B2 (en) | 1999-09-06 |
US5025241A (en) | 1991-06-18 |
DE69008226T2 (en) | 1994-08-04 |
DE69008226D1 (en) | 1994-05-26 |
FR2645336B1 (en) | 1991-06-07 |
HK26095A (en) | 1995-03-10 |
JPH02281720A (en) | 1990-11-19 |
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