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WO1997001177A1 - Transformateur generant une tres basse tension electrique de securite pour un commutateur d'alimentation - Google Patents

Transformateur generant une tres basse tension electrique de securite pour un commutateur d'alimentation Download PDF

Info

Publication number
WO1997001177A1
WO1997001177A1 PCT/EP1996/002698 EP9602698W WO9701177A1 WO 1997001177 A1 WO1997001177 A1 WO 1997001177A1 EP 9602698 W EP9602698 W EP 9602698W WO 9701177 A1 WO9701177 A1 WO 9701177A1
Authority
WO
WIPO (PCT)
Prior art keywords
transformer
primary winding
winding
core
transformer according
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.)
Ceased
Application number
PCT/EP1996/002698
Other languages
German (de)
English (en)
Inventor
Erwin Gaisbauer
Johann Winkler
Günther SCHINKINGER
Peter Witzlinger
Anton Duschl
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.)
Vogt Electronic AG
Original Assignee
Vogt Electronic AG
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
Priority claimed from DE29509926U external-priority patent/DE29509926U1/de
Priority claimed from DE1995140525 external-priority patent/DE19540525A1/de
Application filed by Vogt Electronic AG filed Critical Vogt Electronic AG
Publication of WO1997001177A1 publication Critical patent/WO1997001177A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/10—Single-phase transformers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F19/00—Fixed transformers or mutual inductances of the signal type
    • H01F19/04—Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range
    • 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
    • H01F27/06—Mounting, supporting or suspending transformers, reactors or choke coils not being of the signal type
    • H01F2027/065—Mounting on printed circuit boards

Definitions

  • Switching power supply transformer for generating a SELV voltage
  • the invention relates to a transformer for a switching power supply for generating a SELV voltage (Safety Electric Low Voltage), in particular for operating one or more halogen lamps.
  • SELV voltage Safety Electric Low Voltage
  • the object of the invention is to make the transformer so flat that it is possible to install it together with the appropriately sized switching power supply completely in a plate, in particular chipboard, of the type used in furniture and housing construction at least from a thickness of 19 mm , although it should be capable of transmitting a power of a few 10 watts despite its small height, should have a high degree of efficiency in order to avoid heat development that is particularly critical in this application and, moreover, should be able to be produced automatically in a simple manner while ensuring the prescribed safety distances.
  • Switched-mode power supplies can be produced with the transformer according to the invention, which at least fit into boards with a thickness of 19 mm or more and thereby enable a power transmission of 60 watts and more.
  • the transformer is easily mechanically vol.automatically and with a high level
  • the transformer according to the invention exhibits very advantageous operating behavior.
  • the use of a single secondary winding on the side next to one or at most between two secondary windings on the one hand brings about a certain reduction in the coupling between the primary side and the secondary side and thus a corresponding short-circuit strength, while on the other hand the length of the middle leg specified by the prescribed thickness of insulation material between the individual windings of the core, at least the total insulation thickness to be provided is optimally small, so that even relatively thick wires can be used for the windings within the specified, relatively low maximum overall height of the transformer, which is very beneficial for the undesirable heat development due to the ohmic winding resistance.
  • the achievable coupling between the primary side and the secondary side is completely sufficient for the desired high power transmission capacity, that is to say that the transformer according to the invention achieves a very good compromise in every respect
  • the transformers have a toroid on which the primary winding is wound.
  • the core and primary winding are in a double-shell casing completely encapsulated from plastic.
  • This sheath has a center hole insulated from the core and primary winding, and the secondary winding is wound through the center hole on the outside over the sheath.
  • the coupling between the primary side and the secondary side would be so great in both cases with a disk thickness that was optimized with regard to the prescribed insulation thickness between the windings that there would not be sufficient short-circuit strength, so that thicker insulation washers would have to be used between the windings for this purpose, as a result of which the achievable minimum height of the transformer would be further increased.
  • the subordinate claims relate to advantageous developments of the transformer according to patent claim 1.
  • the design according to patent claim 6 is of particular importance here. This enables the transmission of particularly high electrical power from the power network to low-voltage consumers, as well as dimensions that are optimally small in the lateral direction enable the required safe separation between the primary and secondary sides.
  • the bobbin washers do not need to protrude much around the primary winding and the secondary windings, because even under thermal movements due to the same temperature behavior of the bobbin and the insulating material due to the use of the same material, no creepage and clearance between the surroundings - circumferential side of the primary winding and on both sides next to the Spu ⁇ len beneficiausionn adjacent thereto secondary windings may arise, so that relatively small distances between the primary winding and the secondary windings zulä ⁇ 'are ig.
  • the Primary winding and secondary windings can be realized with the same diameter, whereby an optimal coupling can be achieved.
  • a practical transformer for a power transmission of 105 watts has a height of only about 12 mm and a maximum lateral extension of 35 mm.
  • FIG. 1 is an exploded view of a first exemplary embodiment of the transformer according to the invention in side view
  • FIG. 2 shows the transformer according to FIG. 1 in a side view in a position rotated by 90 ° with respect to FIG. 1, the core being shown in section along the section line II in FIG. 2,
  • FIG. 3 shows the transformer according to FIGS. 1 and 2 in a view from above
  • Fig. 4 shows the entire switching power supply with a transformer according to the invention in a schematic representation, seen from the side.
  • FIG. 5a to 5c a further embodiment of the transformer according to the invention before the encapsulation with an insulating compound, u. 5a partly in cross-section and partly in side view along the section line Va-Va in FIG. 5b, in FIG. 5b with respect to FIG. 5a in a view from below and in FIG. 5c with respect to FIG. 5a in
  • FIG. 6a in cross section along the section line Vla-Via in Fig. 6b, in Fig. 6b with respect to Fig. 6a in
  • the transformer has a coil former 1 which, as can be seen in FIGS. 1 and 2, has two flat winding spaces 1d and le between relatively thin outer walls 1a and 1b and a likewise thin middle wall 1c limited, of which one (ld) has a smaller height than the other (le), the former receiving the secondary winding ld 'and the latter the primary winding le'.
  • a bore lg extends through the central part 1f of the coil former 1.
  • the core 2 of the transformer consists of two identical halves 2a and 2b, which have an E shape, the side legs 2c and the yoke sections 2d have a rectangular cross section and the center leg 2e is circular in cross section.
  • the outer walls la and lb of the coil former 1 are provided on the outside with groove-like recesses lh extending perpendicular to the plane of the drawing in FIG. 2, into which the core halves 2a, 2b with their yoke sections 2d can be inserted.
  • the middle leg sections 2e of the core 2 engage in the central bore 1g of the coil former 1, the side legs 2c colliding on the end faces essentially without a gap, so that the total height x of the transformer is twice the height x / 2 of the side legs 2c corresponds to the core halves 2a, 2b.
  • the outer wall la has the coil body 1 a in Fig. 3 to be seen segment li on from which one end of the single-layer secondary winding ld 'from the inside to the out in Fig. 3 to be seen associated connection contact 3a is The other, outer end of the secondary winding ld 'is connected to the connection contact 3b.
  • the primary winding le ' is connected to the contact pins 4 shown in FIG. 1.
  • the total height x of the core composed of the core halves 2a and 2b is approximately 10 mm. A power of approx. 60 W can be transmitted via this core.
  • the entire switching power supply consists, for example, as shown schematically in FIG. 4
  • a flat carrier arranged adjacent to a broad side of the transformer Tr and preferably designed as a circuit board P for the latter and the switching power supply electronics SE,
  • the switched-mode power supply electronics SE being arranged laterally next to the transformer Tr in the region of its height, ie for
  • Total height of the switching power supply does not contribute. In the case of a baus in a chipboard of 16 mm thickness thus remains for the board P arranged immediately adjacent to a broad side of the transformer Tr including the line connections 3a, 3b, 4 and the sheath U a height of 6 mm. This height is sufficient.
  • the circuit board P is preferably arranged on the transformer side on which the winding connections 3a, 3b and 4 are located.
  • the center disk lc of the coil former 1 projects beyond the primary coil and the secondary coil to such an extent that the prescribed length of the clearance and air gap between the primary coil and the secondary coil, including the connections of the latter, is present.
  • the transformer according to the invention shown in FIGS. 5a to 6c it has a coil former 11, a core 12, a primary winding 13, two secondary windings 14a, 14b and an outer extrusion coating 15.
  • the core 12 has an E-E shape with a central leg 12a with a circular cross-section and side legs 12b with a rectangular cross-section, which extend outside the coil former 11 and the windings 13, 14a, and 14b.
  • the coil former 11 has a tubular middle part 11a, two of which are parallel to one another at a mutual distance
  • Flat winding chamber 11k receiving primary winding 13 and are each on their broad side facing away from primary winding 13 in a winding space 111 which is open to the side and which can be regarded as a flat chamber open to the side, with a
  • Secondary winding 14a and 14b occupied, which is wound from thick wire spirally self-supporting in one layer.
  • Secondary windings 14a and 14b are fixed in the radial direction circumferentially on the outside in their position on the respective disk 11b and 11c by means of projections 11d that extend from the outside protrude broad sides of the discs llb and llc.
  • the secondary windings each surround a collar Ile, which is formed by the central coil body part 11a protruding somewhat beyond the outer broad side of the relevant disk 11b or 11c and fixes the associated secondary winding in the radially inward direction.
  • the disks 11b and 11c have projections 11f and 11g which extend outward from them at diametrically opposite locations for fixing the ends 13a and 13b of the primary winding 3 on the one hand and 11h and 11i for fixing the ends 14al, 14a2 as well as 14bl and 14b2 of the secondary windings 14a and 14b on the other hand.
  • the ends 14al, 14a2, 14bl, and 14b2 of the secondary windings 14a and 14b are bent toward the side of the coil former 11 located at the bottom in FIG. 1a parallel to its central axis M and protrude somewhat from the shoulder III as contact pins, the ends 14al and 14a2 of the secondary winding 14a penetrate the shoulder 11h on the adjacent disk 11b through a hole.
  • the ends 13a and 13b of the primary winding 13 are each fastened to a contact pin 16a and 16b, which is fastened in the lateral extension 11f of the disk 11c and extends parallel to the coil core central axis M and which the respective end 13a or 13b wraps around.
  • the winding end 13a coming from an outer turn of the primary winding 13 is first guided over the lateral extension 11g of the coil former disc 11b and only then to the pin 16a in order to achieve a particularly reliable position fixation.
  • the core webs 12c on both sides crossing the secondary windings 14a and 14b are each provided with a recess 12d, which creates space for the respective inner end of the adjacent primary winding 14a or 14b, which is led outward over the spiral winding to the fixing attachment assigned to it.
  • the encapsulation is carried out in such a way that in the finished encapsulation 15 insulating compound from the latter and the coil former 11, at least along the edge region of the coil former disks 11b and 11c, have formed a molecular connection with one another without gaps, so that the dividing line drawn in FIG. 6a between these parts at least there largely or completely disappears and thus the primary winding 13 is reliably encapsulated without the possibility that an air gap is formed towards the one and / or other secondary winding 14a, 14b under thermal movements.
  • the extrusion coating 15 also covers the secondary windings 14a, 14b up to the core webs 12c.
  • the encapsulation of the coil body provided with the windings is preferably carried out without the core of the transformer, because the pressure on the core could change ⁇ , as was the case with the simple casting of the coil body with the windings in a shell together with the core, which has been frequently practiced up to now can happen.
  • the drawing shows on a scale of about 2: 1 a practical embodiment of a transformer according to the invention according to FIGS. 5a-6c, via which a power of 105 watts can be transmitted, the secondary windings 14a, 14b being dimensioned such that they are each for have an output voltage of approximately 12 volts, so that the secondary voltage of the transformer is approximately 12 volts when the secondary windings are connected in parallel and approximately 24 volts when the secondary windings are connected in series.
  • Heat dissipation to the outside which is particularly considering which, compared to the embodiment according to FIGS. 1 to 3, has a larger coupling between the primary side and the secondary side, particularly in the case of a short circuit on the secondary side.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Dc-Dc Converters (AREA)

Abstract

L'invention concerne un transformateur plat et compact pour commutateurs d'alimentation qui permet de réaliser un commutateur d'alimentation à transformateur intégré susceptible d'être incorporé à un panneau, notamment un panneau en presspahn, d'une épaisseur normalisée égale ou inférieure à 19 mm de sorte que ledit commutateur d'alimentation ne fasse pas saillie hors du panneau. Malgré sa hauteur réduite, le transformateur peut transmettre une puissance d'au moins 60 watts. Le transformateur a une hauteur maximum de 19 mm et comprend un corps de bobine (11) en une seule pièce sur lequel un seul enroulement primaire plat (13) et au moins un enroulement secondaire (14a, 14b) lui aussi plat sont montés directement à côté l'un de l'autre et séparés par un entrefer et une ligne de fuite définis avec précision uniquement par une mince paroi circulaire (11b, 11c) du corps de bobine (11). Dans un mode préféré de réalisation, des rondelles isolantes (11b, 11c) solidaires du corps de bobine (11) sont montées des deux côtés de l'enroulement primaire (13) et un enroulement secondaire (14a ou 14b) enroulé en spirale de façon à former une seule couche autoporteuse s'appuie sur le côté des rondelles isolantes (11b, 11c) opposé à l'enroulement primaire (13). Une masse isolante (15) est pulvérisée sur le corps de bobine (11) et les enroulements (13, 14a, 14b) de sorte qu'une liaison moléculaire sans lacunes se crée entre au moins la circonférence des rondelles isolantes (11b, 11c) de part et d'autre de l'enroulement primaire et la couche de revêtement pulvérisée (15). A cet effet, la couche de revêtement pulvérisée (15) est de préférence constituée du même matériau que le corps de bobine (12).
PCT/EP1996/002698 1995-06-22 1996-06-21 Transformateur generant une tres basse tension electrique de securite pour un commutateur d'alimentation Ceased WO1997001177A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE29509926.7 1995-06-22
DE29509926U DE29509926U1 (de) 1995-06-22 1995-06-22 Transformator für ein Schaltnetzteil zum Erzeugen einer SELV-Spannung
DE1995140525 DE19540525A1 (de) 1995-10-31 1995-10-31 Transformator für Schaltnetzteilanwendungen, insbesondere zum Speisen von Halogenlampen
DE19540525.0 1995-10-31

Publications (1)

Publication Number Publication Date
WO1997001177A1 true WO1997001177A1 (fr) 1997-01-09

Family

ID=26019946

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/002698 Ceased WO1997001177A1 (fr) 1995-06-22 1996-06-21 Transformateur generant une tres basse tension electrique de securite pour un commutateur d'alimentation

Country Status (1)

Country Link
WO (1) WO1997001177A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2409881A1 (de) * 1974-03-01 1975-09-04 Siemens Ag Schalenkernuebertrager
EP0293617A1 (fr) * 1987-06-02 1988-12-07 Vacuumschmelze GmbH Transmetteur de puissance à haute fréquence
WO1991015861A1 (fr) * 1990-03-30 1991-10-17 Multisource Technology Corporation Transformateur plan de profil bas utilise dans des alimentations electriques a decoupage autonomes
DE4241689A1 (en) * 1991-12-10 1993-06-17 Toko Inc Step=up transformer with sepd. prim. and sec. windings - arranged end=to=end along axis of winding sleeve and electromagnetically coupled by core
JPH05166646A (ja) * 1991-12-12 1993-07-02 Tdk Corp 電源トランス
US5319342A (en) * 1992-12-29 1994-06-07 Kami Electronics Ind. Co., Ltd. Flat transformer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2409881A1 (de) * 1974-03-01 1975-09-04 Siemens Ag Schalenkernuebertrager
EP0293617A1 (fr) * 1987-06-02 1988-12-07 Vacuumschmelze GmbH Transmetteur de puissance à haute fréquence
WO1991015861A1 (fr) * 1990-03-30 1991-10-17 Multisource Technology Corporation Transformateur plan de profil bas utilise dans des alimentations electriques a decoupage autonomes
DE4241689A1 (en) * 1991-12-10 1993-06-17 Toko Inc Step=up transformer with sepd. prim. and sec. windings - arranged end=to=end along axis of winding sleeve and electromagnetically coupled by core
JPH05166646A (ja) * 1991-12-12 1993-07-02 Tdk Corp 電源トランス
US5319342A (en) * 1992-12-29 1994-06-07 Kami Electronics Ind. Co., Ltd. Flat transformer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 568 (E - 1447) 14 October 1993 (1993-10-14) *

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