EP0656636A1 - Transformateur avec blindage et son utilisation - Google Patents

Transformateur avec blindage et son utilisation Download PDF

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Publication number
EP0656636A1
EP0656636A1 EP94114267A EP94114267A EP0656636A1 EP 0656636 A1 EP0656636 A1 EP 0656636A1 EP 94114267 A EP94114267 A EP 94114267A EP 94114267 A EP94114267 A EP 94114267A EP 0656636 A1 EP0656636 A1 EP 0656636A1
Authority
EP
European Patent Office
Prior art keywords
transformer according
insulation
core
shield
multilayer
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
EP94114267A
Other languages
German (de)
English (en)
Other versions
EP0656636B1 (fr
Inventor
Franz Ohms
Volker Scherb
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
ANT Nachrichtentechnik GmbH
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 Robert Bosch GmbH, ANT Nachrichtentechnik GmbH filed Critical Robert Bosch GmbH
Publication of EP0656636A1 publication Critical patent/EP0656636A1/fr
Application granted granted Critical
Publication of EP0656636B1 publication Critical patent/EP0656636B1/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
    • H01F27/2804—Printed windings
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
    • 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
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/327—Encapsulating or impregnating
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens

Definitions

  • the invention relates to a transformer according to the preamble of claim 1.
  • a transformer is known from AT-PS 182 176.
  • a transformer with adjacent individual windings is known, which are separated from each other by a shield.
  • the shielding serves to prevent the transmission of high-frequency interference signals between the two individual windings.
  • the shielding consists of a washer encompassing the core leg with a short-circuit isolating slot which is bridged by HF.
  • the transformer according to AT-PS 182 176 has the same shielding, which is surrounded by a plastic compound for insulation.
  • a high-voltage transformer in which the primary and secondary windings are separated from one another by insulation means (sealing compound) and between them - here concentrically to the winding core - a longitudinally slotted, cylindrical metal shield is placed on ground. The heat is dissipated from the windings via this metal screen.
  • the object of the invention is to provide a transformer which allows different transmission ratios in a simple manner. This object is achieved by measures of claim 1.
  • the further claims show advantageous further developments or possible uses.
  • the conductor tracks of at least one of the transformer windings are accommodated in several layers of a multilayer, they can optionally be interconnected to form different overall windings, so that the transformer can be implemented for different transmission ratios with an otherwise identical structure. This reduces warehousing and quality testing for transformers that are operated on different consumers.
  • the measures of the invention ensure that crack growth due to different coefficients of thermal expansion is effectively suppressed, in particular when the measures according to claims 4 to 7 are applied.
  • detachment of the shield from the insulation mass is prevented since the multilayer is flexible and no mechanical stresses occur due to the similar expansion coefficients of its outer layers to the adjacent insulation mass.
  • This advantage is all the more effective if, according to claim 4, the shielding is integrated in the multilayer as a final layer.
  • the transmitter according to the invention works reliably both under space conditions (vacuum) and in the so-called intermediate pressure range; i.e. in a pressure range between atmospheric normal pressure and vacuum, during the launch phase of a satellite.
  • the shielding can no longer trigger cracks, especially at low temperatures.
  • Current transformers known to date cannot be operated easily in the Paschen minimum, since glow discharges can occur which, when using the current transformer in a control circuit, have a disruptive effect on the controlled variable transformed by the transformer.
  • the anode voltage is no longer constant. In addition, the efficiency of the entire power supply circuit drops.
  • This transmitter has one three-legged core, which completely encloses the individual windings w1 and w2 except for the side window.
  • the individual windings w1 and w2 are arranged side by side on a coil former SK, which runs concentrically with the winding core KE as a central leg.
  • the coil former SK has projections VS in the region of the winding ends, so that winding chambers are formed which completely surround the individual windings w1, w2 except for the surfaces facing away from the winding core KE.
  • the two individual windings w1 and w2 are separated from one another by a shield S which, in the exemplary embodiment according to FIG.
  • This shield S consists of a disc-shaped ring (Fig. 2) in the form of a multilayer.
  • This multilayer has an electrically conductive layer ES, for example a copper layer, which is arranged between two insulating outer layers AS. 2 shows, the conductive layer ES is interrupted by a short-circuit isolating slot KT.
  • the coil body SK together with the individual windings w1 and w2 and the shield connection S is embedded in an insulation compound VM in such a way that this insulation compound VM overcomes all external parts by approximately 10% and a cylindrical, annular composite body is formed.
  • a suitable sealing compound is a potting compound made of epoxy resin, which can optionally be glass fiber reinforced or filled with other inorganic materials (cf. etz Volume 105 (1984) Issue 9, page 441 or US 4,176,334 "epoxy-glass laminate").
  • the outer layers AS of the shield consist of the chemically the same or at least similar material as that of the insulation mass VM.
  • the coefficient of thermal expansion of the insulation compound VM and the outer layers AS must be at least of the same order of magnitude so that no cracking can occur.
  • the multilayer of the shielding S as shown in FIG.
  • the winding wires and the shield connection are advantageously carried out with shrinked jumper wires from the sealing compound.
  • the shrink tubing material is selected so that the adhesive strength of the material can be increased several times by cleaning processes such as corona discharges and plasma etching. It is also possible to use high-voltage strands, but their adhesion in the casting compound must be ensured.
  • the core is divided in the region of a middle of each leg (Fig. 1, dashed lines).
  • a centering sleeve ZH for example made of PEEK plastic, is provided to center the two core halves.
  • This centering sleeve also serves as a spacer between the composite body, consisting of the individual windings w1, w2, shielding S and coil former SK embedded in the insulation mass VM.
  • the last composite body is separated from the core parts by an air gap LS and is only glued to one of the leg yokes - the lower one in the example shown.
  • the attachment should always be made to the yoke that ensures that the gravity of the composite body counteracts the acceleration of the core. The composite body is thus pressed against the core when the core is accelerated.
  • the air gap LS to the centering sleeve ZH can be set by at least one stop AG, which is preferably attached to each end of the centering sleeve ZH, which is located away from the adhesive surface of the composite body.
  • the air gap LS offers sufficient high vacuum insulation when operating in space.
  • the centering sleeve ZH reduces the risk of a rollover during operation up to approx. 90 ° C under normal pressure.
  • the core of the transformer with the central winding core WK and the outer legs DK and the associated yokes is separated from the ground potential on which the ground body MK lies by an insulating layer IS.
  • This insulating layer for example of PEEK plastic, is dimensioned such that no discharges can occur over this insulating layer IS in the pressure range below 10- 2 mbar (vacuum operation).
  • the transformer according to the invention as part of a cathode current regulator for a traveling wave tube amplifier (cf. DE 38 43 260 C1)
  • the winding w2 represents the anode coil
  • the winding w1 represents the cathode coil.
  • the anode coil is at a potential which varies between 500 V and approximately 5 kV.
  • the conductive layer ES of the shield S is also placed at this "floating" potential so that arcing, in particular in the intermediate pressure range, can be derived directly.
  • the anode coil leads to the pads LA3 and LA4. Accordingly, the pad LA5 is expediently connected to the pad LA4.
  • the cathode coil is approximately 6 kV DC.
  • the helix of the traveling wave tube is connected to the mass body MK.
  • the winding w2 - conductor tracks b1, b2, b3, ... are one in several layers according to the invention
  • Multilayer ML (FIG. 3) is provided, the conductor tracks in the different layers being able to be interconnected to form different overall windings via conductor bridges, in this case simply implemented by through-contacts D.
  • the conductor track b1 is arranged in a single layer of the multilayer ML in a spiral around the winding core KE and can be interconnected via plated-through holes D with a further conductor track b2 in a layer of the multilayer ML below or above it.
  • the conductor tracks b1, b2, b3 of different positions can be interconnected via conductor bridges or the plated-through holes D, for example partially or completely connected in series, so that the individual winding w2 together with the individual winding w1 have a desired transmission ratio specifies, for example for the operation of a cathode current regulator of a traveling wave tube amplifier with different cathode current I K. For a current range of 30 to 120 mA, for example, three different transformers had to be kept available. With the invention, this area can be covered subsequently by different arrangement of conductor bridges between the conductor tracks.
  • the shielding S forms the end position of the multilayer ML and is therefore integrated in the multilayer ML with the advantages described at the beginning.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Regulation Of General Use Transformers (AREA)
EP94114267A 1993-12-01 1994-09-10 Transformateur avec blindage et son utilisation Expired - Lifetime EP0656636B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4340928A DE4340928A1 (de) 1993-12-01 1993-12-01 Übertrager mit Schirmung sowie Verwendung
DE4340928 1993-12-01

Publications (2)

Publication Number Publication Date
EP0656636A1 true EP0656636A1 (fr) 1995-06-07
EP0656636B1 EP0656636B1 (fr) 1998-07-22

Family

ID=6503903

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94114267A Expired - Lifetime EP0656636B1 (fr) 1993-12-01 1994-09-10 Transformateur avec blindage et son utilisation

Country Status (2)

Country Link
EP (1) EP0656636B1 (fr)
DE (2) DE4340928A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0780853A1 (fr) * 1995-12-21 1997-06-25 Hewlett-Packard Company Structure d'une inductance

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7495539B2 (en) * 2006-10-02 2009-02-24 General Electric Company Filament transformer for X-ray tubes
DE102014116139A1 (de) * 2014-11-05 2016-05-12 Epcos Ag Induktives Bauelement

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE471184C (de) * 1929-02-15 Aeg Wicklungsaufbau fuer Transformatoren mit einer aus einzelnen Spulen geschichteten Hochspannungswicklung und konzentrisch zu dieser Wicklung angeordneten, voneinander isolierten einzelnen Metallzylindern
FR2262857A1 (en) * 1974-03-01 1975-09-26 Siemens Ag Shell core transformer with central core piece - has specified core piece configuration corresponding to shell slots
JPS61172304A (ja) * 1985-01-28 1986-08-04 Canon Inc コイル積層体
GB2250383A (en) * 1990-10-05 1992-06-03 Nippon Cmk Kk Coil comprising multi layer printed circuit boards

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT182176B (de) * 1953-10-06 1955-06-10 Siemens Ag Eingangs- oder Symmetrietransformator für Verstärker oder Meßgeräte
DE4205957A1 (de) * 1992-02-27 1993-09-02 Vogt Electronic Ag Spulenaufbau
DE4306655C2 (de) * 1992-03-04 1997-04-30 Toshiba Kawasaki Kk Verfahren zum Herstellen eines planaren Induktionselements

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE471184C (de) * 1929-02-15 Aeg Wicklungsaufbau fuer Transformatoren mit einer aus einzelnen Spulen geschichteten Hochspannungswicklung und konzentrisch zu dieser Wicklung angeordneten, voneinander isolierten einzelnen Metallzylindern
FR2262857A1 (en) * 1974-03-01 1975-09-26 Siemens Ag Shell core transformer with central core piece - has specified core piece configuration corresponding to shell slots
JPS61172304A (ja) * 1985-01-28 1986-08-04 Canon Inc コイル積層体
GB2250383A (en) * 1990-10-05 1992-06-03 Nippon Cmk Kk Coil comprising multi layer printed circuit boards

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 379 (E - 465) 18 December 1986 (1986-12-18) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0780853A1 (fr) * 1995-12-21 1997-06-25 Hewlett-Packard Company Structure d'une inductance

Also Published As

Publication number Publication date
EP0656636B1 (fr) 1998-07-22
DE4340928A1 (de) 1995-06-08
DE59406488D1 (de) 1998-08-27

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