EP0293617B1 - Transmetteur de puissance à haute fréquence - Google Patents

Transmetteur de puissance à haute fréquence Download PDF

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Publication number
EP0293617B1
EP0293617B1 EP88107116A EP88107116A EP0293617B1 EP 0293617 B1 EP0293617 B1 EP 0293617B1 EP 88107116 A EP88107116 A EP 88107116A EP 88107116 A EP88107116 A EP 88107116A EP 0293617 B1 EP0293617 B1 EP 0293617B1
Authority
EP
European Patent Office
Prior art keywords
frequency power
power transformer
primary
central
parts
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
EP88107116A
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German (de)
English (en)
Other versions
EP0293617A1 (fr
Inventor
Edwin Dipl.-Ing. Hielscher
Werner Dipl.-Ing. Loges
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.)
Vacuumschmelze GmbH and Co KG
Original Assignee
Vacuumschmelze GmbH and Co KG
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 Vacuumschmelze GmbH and Co KG filed Critical Vacuumschmelze GmbH and Co KG
Publication of EP0293617A1 publication Critical patent/EP0293617A1/fr
Application granted granted Critical
Publication of EP0293617B1 publication Critical patent/EP0293617B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2866—Combination of wires and sheets
    • 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

Definitions

  • the invention relates to a high-frequency power transformer for switching power supplies.
  • Switched-mode power supplies are known to be used for the energy supply of electrical devices, such as personal computers, video monitors and the like, in which usually several different consumers have to be supplied with different voltages, in particular direct voltages.
  • electrical devices such as personal computers, video monitors and the like
  • the highest possible frequencies are used to operate these power supplies.
  • So-called clocked power supplies have been found to be particularly advantageous, but increasing the operating frequency usually results in an increase in switching losses in the rectifier components, which can be associated with a reduction in efficiency.
  • the switching power supplies can be operated in series or parallel resonance.
  • a particular problem for the switching power supplies working according to the resonance principle is that a defined leakage inductance must be maintained in the power transformers.
  • the problem of leakage inductance is solved in that one of the middle legs of two symmetrically arranged ferrite pot cores is shortened accordingly.
  • the shortening of the middle leg - due to the resulting air gap - has a very large leakage inductance.
  • This measure is intended to ensure that the output voltages and the resonance frequency of the circuit remain almost constant when the load changes.
  • the primary winding and secondary winding created in conventional winding technology are each arranged on a middle leg of a pot core half.
  • the leakage inductance can only be changed by changing the air gap or by changing the length of the middle leg.
  • the secondary windings consist of stacked circuit boards with insulators in between. To ensure galvanic isolation between the primary and secondary side, a specially designed coil former was provided. To reduce both the leakage inductance and the space requirement, the transmitter is integrated into the circuit board of the switching power supply.
  • a disadvantage of this embodiment is that copper-coated boards are used as carrier material for the primary winding, which only allow a limited height of the conductor tracks.
  • a broadband high-frequency power transformer in sandwich construction is known, which is intended for use in a device for inductive heating.
  • the transformer should have very low leakage losses. With a core made of two ferrite parts, scatter losses that are practically zero can be achieved.
  • a sandwich-type transformer is also known from "Patent Abstracts of Japan", Volume 10, No. 217 (E-423) (2273), JP-A-61 54 607.
  • the invention has for its object to provide a high-frequency power transmitter for switching power supplies working on the resonance principle, with which not only a particularly small but also a precisely defined leakage inductance can be achieved.
  • This object is achieved by a high-frequency power transformer with the features of claim 1. Further details and features of the invention emerge from the following description and the subclaims.
  • Fig. 1 shows the mechanical structure of the high-frequency power transformer according to the invention, which is constructed according to the sandwich principle.
  • the illustrated embodiment illustrates one of the many possibilities for nesting the individual windings with one another, with a particularly small leakage inductance being achieved in this form. Additional insulation of the cable leads, especially of the secondary winding parts, has been omitted because it is easier to present.
  • the middle leg of a soft magnetic core part 2 is designated, which together with a core part 3 with middle leg 4 forms the actual core of the power transformer.
  • the core parts 2 and 3 are of the E-type, the middle legs 1 and 4 being round and the spaces 5 and 6 accommodating the coils in the region of the core parts 2 and 3 being correspondingly cylindrical.
  • the cylindrical shape of the middle leg is particularly advantageous, since the components to be stacked can be annular, which considerably simplifies their manufacture.
  • core parts can also be used in which the central limbs can be square or rectangular in cross-section, with appropriate design of the spaces 5 and 6 surrounding them.
  • a sleeve-shaped coil carrier 7 can be pushed on, which has a flange 8 with which it is supported against the core part 2.
  • the winding parts 9 of the primary windings or the bobbins 10 carrying them and the winding parts 12 of the secondary windings as well as insulation disks 13 in between can be stacked on the coil carrier 7.
  • the coil formers 10 for the winding parts 9 of the primary winding are of circular design, the winding 9 being inserted in a preferably U-shaped cross section.
  • Fig. 1 shows a particularly advantageous embodiment of the secondary winding parts 12, which are designed as flat, single-winded, annular stamped parts with terminal lugs 12a and 12b.
  • the terminal lugs 12a and 12b are normally led out in isolation.
  • a plurality of winding parts 12 of the secondary winding can be connected in series, in which case connecting lugs 12b which belong together are then electrically connected to one another. This connection can be routed to the outside and then provides a center tap of the winding parts connected in series.
  • the bobbin 7 is pushed onto the middle leg 1 of the core part 2. Then the core part is from above 3 placed, the middle leg 4 engages in the interior of the sleeve-shaped coil carrier 7, whereby all parts are secured to each other.
  • the core parts 2 and 3 can be pressed against one another with the aid of resilient clamps, which are not shown.
  • the connecting lugs 12a and 12b and the connections of the winding parts 9 are led out through the lateral recesses in the core parts 2 and 3.
  • a defined leakage inductance can be set with the insulation disks 13 between the primary winding parts 9 and the secondary winding parts 12, specifically by the number of insulation disks and their thickness.
  • the thin lines 13 represent insulating washers or insulating spacing washers.
  • FIG. 2a shows an embodiment according to FIG. 2a, but with additional primary and secondary winding parts.
  • FIG. 3 shows the relationship between the leakage inductance L and the distance a, generated by the spacer insulation washers 13, for different winding combinations detect.
  • the embodiment according to FIG. 2d further shows that an adjustable leakage inductance can also be realized with more than two primary part windings.
  • a division of the primary winding into several partial windings on several bobbins has the advantage that smaller current displacement effects (copper losses) than in the exemplary embodiments according to FIGS. 2a to 2c can be achieved due to the better spatial distribution of the windings.
  • solid copper wires it is also possible to use HF strands with any cross-section and number of strands on the individual bobbins. This applies equally to the primary winding as well as to the secondary windings.
  • solid copper sheets are used on the secondary side, which can be replaced at higher frequencies to minimize the current displacement effects by several thin copper sheets which are insulated from one another.
  • the different output powers of the transformers required in the switching power supply applications require different copper cross sections of the windings. This is easily possible with the winding principle according to the invention.
  • the examples shown are designed with four secondary windings, which can be connected as required according to the respective requirements, such as output voltage and output current.
  • the number of winding parts can be increased or reduced at any time.
  • FIG. 4 shows a sectional drawing of the high-frequency power transformer, which is constructed in accordance with the winding combination according to FIG. 2b.
  • the after the The clearance and creepage distances required by VDE guidelines can be easily complied with if the primary winding diameter and the secondary copper sheet diameter are selected accordingly. Insulation between the primary winding parts 9 and the secondary winding parts 12 can be dispensed with in this particular embodiment, since the coil carriers 10 are pushed over the coil carrier 7.
  • the lead wires for the primary and secondary side are led out by a spatial separation of 180 °.
  • the core shapes with a round middle leg, such as the RM, PM and ETD types, are best suited for this.
  • Fig. 5 shows a sectional drawing of the high-frequency power transformer with a shortened common coil carrier (7, 8).
  • the common coil carrier (7, 8) envelops only a part of the middle leg (1, 4) in the assembled state and a further coil former (11) is plugged directly onto the part of the middle leg (4) that has been left free.
  • This embodiment can be used particularly advantageously if one of the windings - in the example shown the primary winding (9) - requires a high number of turns, or a winding with a larger conductor cross section is required.

Landscapes

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

Claims (7)

  1. Transmetteur de puissance à haute fréquence comportant :
    - des pièces de noyau (2, 3) en matériau magnétique doux présentant au moins un axe central (1),
    - des enroulements primaire et secondaire (9, 12) qui peuvent être constitués de plusieurs enroulements élémentaires,
    - un porte-bobine en forme de manchon (7, 8), monté sur l'axe central, est sur lequel l'enroulement primaire et/ou l'enroulement secondaire ou des parties de ceux-ci peuvent être empilés, puis fixés et maintenus après assemblage des pièces de noyau (2, 3),
    - empilés sur l'axe central (1) c'est-à-dire sur le porte-bobine en forme de manchon (7, 8), des disques espaceurs isolants (13) de forme annulaire, intercalés entre l'enroulement primaire et l'enroulement secondaire (9, 12) ou le cas échéant entre les enroulements élémentaires du primaire et du secondaire (9, 12),
    caractérisé en ce que :
    - il s'agit d'un transmetteur de puissance à haute fréquence d'une partie de réseau de commutation fonctionnant selon le principe de résonance, dans lequel la partie inductrice du circuit oscillant est constituée par le transmetteur de puissance lui-même,
    - en choisissant l'épaisseur et le nombre des disques espaceurs isolants (13) disposés entre les enroulements primaire et secondaire (9, 12), on peut régler l'inductance de fuite du circuit oscillant à une valeur non nulle, préalablement définie.
  2. Transmetteur de puissance à haute fréquence selon la revendication 1, caractérisé en ce que les parties d'enroulement (9) sont montées sur des corps de bobine de forme annulaire, en matériau isolant et dont la section est de préférence en forme de U.
  3. Transmetteur de puissance à haute fréquence selon les revendications 1 et 2, caractérisé en ce que les parties d'enroulement (12) sont constituées par des pièces plates, à une spire, découpées en forme d'anneau, munies de languettes de raccordement (12a, 12b).
  4. Transmetteur de puissance à haute fréquence selon la revendication 3, caractérisé en ce que plusieurs pièces découpées sont assemblées pour former des éléments d'enroulement (12) à plusieurs spires et/ou prises de réglage centrales.
  5. Transmetteur de puissance à haute fréquence selon l'une des revendications 1 à 4, caractérisé en ce que le porte-bobine (7, 8) en forme de manchon, commun à toutes les parties d'enroulement (9, 12) peut être emmanché sur l'axe central d'une partie du noyau (2) de telle sorte qu'en position d'assemblage final, il vient entourer et centrer l'axe central (4) de l'autre partie du noyau (4).
  6. Transmetteur de puissance à haute fréquence selon l'une des revendications 1 à 4, caractérisé en ce que le porte-bobine (7, 8) en forme de manchon, commun à l'ensemble de parties d'enroulement (9, 12) peut être emmanché sur l'axe central (1) d'une partie de noyau (2), de telle sorte qu'en position d'assemblage final, il n'entoure qu'une partie de l'axe central (1, 4) et qu'au moins un corps de bobine (11) puisse être emmanché sur la partie restée libre de l'axe central (1).
  7. Transmetteur de puissance à haute fréquence selon la revendication 5 ou 6, caractérisé en ce que les corps de bobine (10) des parties individuelles d'enroulement (9) et/ou les porte-bobines (7, 8) sont des pièces moulées par injection.
EP88107116A 1987-06-02 1988-05-04 Transmetteur de puissance à haute fréquence Expired - Lifetime EP0293617B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873718383 DE3718383A1 (de) 1987-06-02 1987-06-02 Hochfrequenz-leistungsuebertrager
DE3718383 1987-06-02

Publications (2)

Publication Number Publication Date
EP0293617A1 EP0293617A1 (fr) 1988-12-07
EP0293617B1 true EP0293617B1 (fr) 1992-10-14

Family

ID=6328845

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88107116A Expired - Lifetime EP0293617B1 (fr) 1987-06-02 1988-05-04 Transmetteur de puissance à haute fréquence

Country Status (2)

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EP (1) EP0293617B1 (fr)
DE (2) DE3718383A1 (fr)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69117403T2 (de) * 1990-03-30 1996-09-05 Multisource Tech Corp Niederprofil-flachtransformator für die verwendung bei unabhängig betriebenen schaltnetzteilen
JP2531897B2 (ja) * 1991-05-15 1996-09-04 インターナショナル・ビジネス・マシーンズ・コーポレイション 平面変圧器
US5175525A (en) * 1991-06-11 1992-12-29 Astec International, Ltd. Low profile transformer
DE4137776C2 (de) * 1991-11-16 1996-11-07 Vacuumschmelze Gmbh Hochfrequenzleistungsübertrager in Multilayer-Technik
DE9211148U1 (fr) * 1992-08-20 1993-02-25 Zink, Manfred, 7600 Offenburg, De
US5673183A (en) * 1993-12-01 1997-09-30 Melcher, Ag DC/DC converter for low output voltages
WO1997001177A1 (fr) * 1995-06-22 1997-01-09 Vogt Electronic Ag Transformateur generant une tres basse tension electrique de securite pour un commutateur d'alimentation
DE19540525A1 (de) * 1995-10-31 1997-05-07 Vogt Electronic Ag Transformator für Schaltnetzteilanwendungen, insbesondere zum Speisen von Halogenlampen
DE69601460T2 (de) * 1996-07-17 1999-06-24 Magnetek Spa Flache magnetische Anordnung für elektronische Schaltungen
DE19818673A1 (de) * 1998-04-27 1999-10-28 Thomson Brandt Gmbh Spule
IL139714A0 (en) * 2000-11-15 2002-02-10 Payton Planar Magnetics Ltd A bobbin for hybrid coils in planar magnetic components
ATE491214T1 (de) 2002-10-01 2010-12-15 Det Int Holding Ltd Spulenkörper
CN1937117B (zh) * 2005-09-21 2010-06-09 台达电子工业股份有限公司 具有绕线单体的变压器
DE202006013658U1 (de) * 2006-09-06 2008-01-24 Vogt Electronic Components Gmbh Transformator mit Steckblechwicklung
DE102011075707A1 (de) * 2011-05-12 2012-11-15 SUMIDA Components & Modules GmbH Transformator mit geblechter Wicklung
US8766758B2 (en) 2011-08-18 2014-07-01 Solid State Controls, LLC High-frequency transformer
DE102011082046A1 (de) * 2011-09-02 2013-03-07 Schmidhauser Ag Transformator und zugehöriges Herstellungsverfahren
DE102013200265A1 (de) * 2013-01-10 2014-07-10 SUMIDA Components & Modules GmbH Kleintransformator für hohe Ausgangsspannungen
EP3561824A1 (fr) * 2018-04-26 2019-10-30 Siemens Healthcare GmbH Dispositif de bobine pour un convertisseur à résonance
EP3796347A1 (fr) * 2019-09-23 2021-03-24 Wall Box Chargers S.L. Transformateur planaire avec réduction des pertes de parasites

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2327617A1 (fr) * 1975-10-10 1977-05-06 Tocco Stel Transformateur de puissance haute-frequence a large bande

Also Published As

Publication number Publication date
EP0293617A1 (fr) 1988-12-07
DE3718383A1 (de) 1988-12-15
DE3875278D1 (de) 1992-11-19

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