EP0315527B1 - Transformator mit temperaturstossbeständigem Magnetkreis aus Ferrit - Google Patents

Transformator mit temperaturstossbeständigem Magnetkreis aus Ferrit Download PDF

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Publication number
EP0315527B1
EP0315527B1 EP19880402752 EP88402752A EP0315527B1 EP 0315527 B1 EP0315527 B1 EP 0315527B1 EP 19880402752 EP19880402752 EP 19880402752 EP 88402752 A EP88402752 A EP 88402752A EP 0315527 B1 EP0315527 B1 EP 0315527B1
Authority
EP
European Patent Office
Prior art keywords
transformer
magnetic circuit
air gap
thermal shocks
coil
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
Application number
EP19880402752
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English (en)
French (fr)
Other versions
EP0315527A1 (de
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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Filing date
Publication date
Application filed by Orega Electronique et Mecanique filed Critical Orega Electronique et Mecanique
Publication of EP0315527A1 publication Critical patent/EP0315527A1/de
Application granted granted Critical
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Anticipated expiration legal-status Critical
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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
    • 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
    • H01F27/008—Details of transformers or inductances, in general with temperature compensation
    • 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
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/266—Fastening or mounting the core on casing or support
    • 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
    • H01F38/42—Flyback transformers
    • H01F2038/426—Flyback transformers with gap in transformer core

Definitions

  • the present invention relates to a ferrite magnetic circuit transformer resistant to thermal shock.
  • Switching power supplies operating in "flyback" accumulation mode require energy storage in the magnetic double “E” ferrite circuit of the 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.
  • the magnetic circuit and the coil are assembled by bonding the outer legs of the magnetic circuit and the air gap.
  • Such a process for producing transformers makes it possible to guarantee good mechanical strength of the magnetic circuit and of the coil but does not meet the requirements for resistance to thermal stresses imposed by the standards in force (for example ten thermal shock cycles with a stay at - 25 ° C for 30mn, sudden passage, in a few seconds at + 85 ° C, and stay of 30mn at this last temperature, etc ).
  • the different thermal expansion coefficients of the magnetic circuit and the point of glue at the air gap then generate faults in the ferrite of the magnetic circuit.
  • an air gap could be provided, by bonding the coil to the coil to the magnetic circuit.
  • the air gap would absorb the mechanical stresses caused by thermal tests, but would generate magnetostrictive phenomena resulting in audible snoring in transformers, magnetostriction being a phenomenon of elastic deformation linked to magnetization.
  • Document DE-U-8 609 584 discloses a transformer for which it is sought to reduce the magnetostriction noises and the risks of cracking of the magnetic circuit, the proposed solution being to stick with an epoxy adhesive the outer legs and the air gap, but it is specified there that the coefficient of thermal expansion of this adhesive is "roughly" equal to that of the ferrite of the magnetic circuit, which means that this solution is not suitable for large thermal variations.
  • Document FR-A-1 380 363 discloses a transformer with a magnetic circuit in a cylindrical pot, the air gap of which is air, and which therefore has the drawbacks mentioned above.
  • Document GB-A-2 039 156 discloses a transformer in which a deformable material is introduced into at least one air gap, but its magnetic circuit is "U" shaped.
  • the subject of the present invention is a transformer of the ferrite magnetic circuit type with a section in the form of a double "E", the magnetic circuit of which can resist thermal stresses of the aforementioned type, and which is not the site of magnetostriction noise.
  • the transformer according to the invention comprises, in addition to bonding the outer legs of the magnetic circuit, a bonding between the coil carcass and the magnetic circuit at the level of the coil base and comprises, in the air gap of the central legs, a material of the silicone family. This material can be deposited in a pasty state or in the form of a pellet having a thickness greater than a few tenths of a millimeter than the nominal thickness of the air gap.
  • the transformer 1 in FIG. 1 comprises a magnetic circuit consisting of two ferrite half-circuits 2, 3 having, in section, a shape of "E".
  • the winding carcass 4 of the transformer 1 carries a coil 5 comprising one or more electrically separate windings.
  • the magnetic circuit and the coil carcass are assembled by gluing. This bonding consists in injecting glue into the air gap 6, in the space 7 between the walls of the axial hole of the carcass 4 and the inner legs 8, 9 of the magnetic half-circuits 2, 3 and in the spaces 10, 11 between the opposite faces of the outer legs of circuits 2, 3.
  • Such an assembly makes it possible to guarantee good mechanical strength of the magnetic circuit and of the coil, but only if the thermal variations to which the transformer 1 is subjected are not too large and rapid. Indeed, if the transformer were subjected to "thermal shocks" of the type mentioned in the preamble, they cause faults in the ferrites due to coefficients of thermal expansion that are substantially different from the ferrite and the glue.
  • the present invention proposes, according to the embodiment of FIG. 2, to carry out the assembly of the magnetic circuit 2, 3 and the carcass 4 of the transformer 1A differently. Bonding of the magnetic circuit with respect to the carcass 4 is carried out only at the points 10 and 11 above and on the outer face of a cheek 12 of the carcass 4 (glue points 12A, 12B).
  • This cheek 12 is that which is on the side of the lower magnetic half-circuit 3 and of the base 13 for fixing the transformer and for the electrical connection of its windings.
  • the glue is the one usually used.
  • the air gap 14 between the legs 8, 9 is then empty, that is to say that it is an air air gap. It absorbs the mechanical stresses due to thermal shocks, which means that there is no longer any risk of cracking of the ferrites.
  • the air gap generates magnetostriction noises which result in audible snoring.
  • the embodiment of FIG. 3 makes it possible to very significantly reduce these magnetostriction noises.
  • the transformer 1B in FIG. 3 is produced in the same way as the transformer 1A in FIG. 2, but its air gap determined by the legs 8, 9 is filled with an absorbent material 15 of the family of silicones.
  • the material 15 is deposited in the pasty state on the leg 9 of the lower magnetic half-circuit 3, in a thickness slightly greater than the nominal thickness that the air gap should have.
  • the transformer is assembled as in the case of FIG. 2, that is to say in particular with the dots of glue 10, 11, 12A, 12B.
  • the material 15 is an already hardened tablet which is deposited between the legs 8, 9.
  • the thickness of this tablet must be approximately a few tenths of a millimeter greater than the nominal thickness of the air gap.
  • the surface of its faces in contact with the legs 8, 9 must be greater than about a quarter of the surface of the faces opposite the legs and at most equal to the surface of these faces.
  • this silicone material also has the advantage of making it possible to reduce the operating temperature of the ends of the legs 8, 9 thanks to the good thermal conductivity of the silicone.
  • the magnetic circuit can therefore admit a higher maximum operating temperature.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Coils Or Transformers For Communication (AREA)

Claims (5)

  1. Transformator mit einem wärmeschockfesten Ferritmagnetkreis, der einen Magnetkreis des Typs mit doppel-E-förmigem Querschnitt hat, dadurch gekennzeichnet, daß er eine Klebung (10, 11) der Außenschenkel des Magnetkreises und eine Klebung (12A, 12B) zwischen dem Spulenkörper (4) und dem Magnetkreis (3) auf der Höhe des Sockels (13) der Spule aufweist, und dadurch, daß im Luftspalt der Mittelschenkel (8, 9) ein Material aus der Familie der Silicone angebracht ist.
  2. Transformator nach Anspruch 1, dadurch gekennzeichnet, daß die Dicke des Materials um einige Zehntelmillimeter größer als die Nenndicke des Luftspalts ist.
  3. Transformator nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß das Material im Zustand einer Paste aufgebracht wird.
  4. Transformator nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß das Material in Form einer Pille aufgebracht wird.
  5. Transformator nach Anspruch 4, dadurch gekennzeichnet, daß die Oberfläche der in Berührung mit den Mittelschenkeln (8, 9) stehenden Pillenflächen größer als etwa ein Viertel der Oberfläche der einander zugewandten Flächen dieser Schenkel und höchstens gleich der Oberfläche dieser Flächen ist.
EP19880402752 1987-11-03 1988-11-03 Transformator mit temperaturstossbeständigem Magnetkreis aus Ferrit Expired - Lifetime EP0315527B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8715202 1987-11-03
FR8715202A FR2622732B1 (fr) 1987-11-03 1987-11-03 Transformateur a circuit magnetique en ferrite resistant aux chocs thermiques

Publications (2)

Publication Number Publication Date
EP0315527A1 EP0315527A1 (de) 1989-05-10
EP0315527B1 true EP0315527B1 (de) 1993-05-19

Family

ID=9356419

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880402752 Expired - Lifetime EP0315527B1 (de) 1987-11-03 1988-11-03 Transformator mit temperaturstossbeständigem Magnetkreis aus Ferrit

Country Status (5)

Country Link
EP (1) EP0315527B1 (de)
DE (1) DE3881158T2 (de)
ES (1) ES2041326T3 (de)
FR (1) FR2622732B1 (de)
SG (1) SG9595G (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2645336B1 (fr) * 1989-03-28 1991-06-07 Orega Electro Mecanique Transformateur du type a circuit magnetique ferme en ferrite
NL9001350A (nl) * 1990-06-14 1992-01-02 Philips Nv Transformator met luchtspleet en isolatiefolie-pakket.
DE19627585A1 (de) * 1996-07-09 1998-01-15 Thomson Brandt Gmbh Hochspannungstransformator für einen Fernsehempfänger
ES2179407T3 (es) * 1997-09-29 2003-01-16 Epcos Ag Componente inductivo y procedimiento para su fabricacion.
DE102011116861A1 (de) 2011-10-25 2013-04-25 Epcos Ag Elektronisches Bauelement zur Führung eines Magnetfeldes

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1380363A (fr) * 1964-01-28 1964-11-27 Siemens Ag Bobine électrique avec un noyau de ferrite en coquille
DE2404603A1 (de) * 1974-01-31 1975-08-07 Crl Electronic Bauelemente Auf einen vorgegebenen induktivitaetswert einstellbare induktivitaet
JPS5574111A (en) * 1978-11-29 1980-06-04 Hitachi Ltd Transformer
DE8609584U1 (de) * 1986-04-09 1987-08-06 Philips Patentverwaltung GmbH, 22335 Hamburg Transformator oder Drossel für durch Takten mit einer Taktfrequenz intermittierenden Betrieb

Also Published As

Publication number Publication date
DE3881158T2 (de) 1993-11-18
EP0315527A1 (de) 1989-05-10
ES2041326T3 (es) 1993-11-16
DE3881158D1 (de) 1993-06-24
FR2622732A1 (fr) 1989-05-05
FR2622732B1 (fr) 1990-08-03
SG9595G (en) 1995-06-16

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