EP0585650A1 - Transducteur et son application - Google Patents

Transducteur et son application Download PDF

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Publication number
EP0585650A1
EP0585650A1 EP93112626A EP93112626A EP0585650A1 EP 0585650 A1 EP0585650 A1 EP 0585650A1 EP 93112626 A EP93112626 A EP 93112626A EP 93112626 A EP93112626 A EP 93112626A EP 0585650 A1 EP0585650 A1 EP 0585650A1
Authority
EP
European Patent Office
Prior art keywords
core
transformer
transformer according
insulation
potential
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
EP93112626A
Other languages
German (de)
English (en)
Other versions
EP0585650B1 (fr
Inventor
Volker Dipl.-Ing. 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
Priority claimed from DE4227891A external-priority patent/DE4227891A1/de
Priority claimed from DE4227890A external-priority patent/DE4227890A1/de
Application filed by Robert Bosch GmbH, ANT Nachrichtentechnik GmbH filed Critical Robert Bosch GmbH
Publication of EP0585650A1 publication Critical patent/EP0585650A1/fr
Application granted granted Critical
Publication of EP0585650B1 publication Critical patent/EP0585650B1/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
    • H01F27/32—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
    • 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

Definitions

  • the invention is based on a transformer according to the preamble of claim 1.
  • a transformer for generating high voltages is known, the windings of which are embedded in an insulation mass.
  • the secondary windings of the transformer are each arranged side by side in separate bobbins.
  • Primary and secondary windings are separated from each other by shields, which are also embedded in the insulation mass.
  • 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 concentric to the winding core - a longitudinally slotted, cylindrical metal shield is arranged on ground. The heat is dissipated from the windings via this metal screen.
  • the object of the present invention is to design the transformer according to the preamble of patent claim 1 in such a way that adequate rollover security is ensured, in particular for operation in different pressure ranges. This object is achieved by the measures of claim 1.
  • the further claims show advantageous further developments or possible uses.
  • the measure of claim 2 ensures that, despite the one-sided attachment to only one core fluctuation, the insulation mass cannot shift even during accelerations (start phase of the satellite).
  • the shielding according to claim 3 also inhibits the risk of flashovers and ensures that discharges in the intermediate pressure area take place in a controlled manner.
  • the measures according to claim 4 ensure that crack growth due to different coefficients of thermal expansion is effectively suppressed. In particular, 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.
  • the shielding can no longer trigger cracks, especially at low temperatures.
  • Current transformers known to date cannot be operated easily at 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. So when using a conventional transformer as part of a cathode current regulator for a traveling wave tube amplifier Anode voltage no longer constant. In addition, the efficiency of the entire power supply circuit drops.
  • FIG. 1 shows a transformer according to the invention.
  • This transformer has a three-legged core, which completely encloses the transformer windings w1 and w2 except for side windows.
  • the transformer windings w1 and w2 are arranged side by side on a coil former SK, which is concentric with the winding core KE as a central leg.
  • the coil former SK has in each case Area of the winding ends protrusions VS, so that winding chambers are formed which completely surround the transformer windings w1, w2 except for the surfaces facing away from the winding core KE.
  • the two transformer windings w1 and w2 are separated from one another by a shield S, which is arranged 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 transformer 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 survives 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 shield 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 transformer 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 composite body is only attached to a core wall KW. By gluing, this attachment is sufficiently elastic so that there are no mechanical stresses that can lead to cracks.
  • the core wall KW to which the gluing takes place, is selected so that when the core is accelerated, for example during the launch phase of a satellite, it is pressed against this core wall.
  • 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 air gap LS to the centering sleeve ZH can be adjusted 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 made of PEEK plastic, is dimensioned such that no discharges can occur through this insulating layer IS in the pressure range below 10 ⁇ 2 mbar (vacuum operation).
  • the transformer according to the invention can advantageously be used as a measuring transducer that also works in high-voltage potential in terms of DC, but only has to process small potential differences in terms of AC.
  • the winding w2 represents the anode coil and the winding w1 represents the cathode coil.
  • the anode coil is at a potential which varies in particular in the intermediate pressure range between 500 V and approximately 5 kV.
  • the conductive layer ES of the shield S is also set to 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 typical voltage loads of the transformer according to the invention are thus as follows: When the power supply is switched on "the core runs up to the cathode voltage of 6 kV". In the intermediate pressure range during the launch phase of the satellite, the core passes through the Paschen minimum, ie theoretically there are an infinite number of discharges, so that the core assumes ground potential. Upon entering the vacuum of space, the core can charge to the maximum voltage U K (cathode voltage). This recharging of the core takes several hours due to the high insulation resistances of the insulating layers IS and the potting material VM. In the high vacuum of space, the nucleus remains at the voltage U K ; unless a local pressure increase occurs which causes the core to discharge.
  • the core of the transmitter can be designed as a shell or RM core.
  • the measures of the invention enable both safe operation in the intermediate pressure range and reliable long-term operation (lifespan of the satellite greater than 10 years) under space conditions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformers For Measuring Instruments (AREA)
EP93112626A 1992-08-22 1993-08-06 Transducteur et son application Expired - Lifetime EP0585650B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4227891A DE4227891A1 (de) 1992-08-22 1992-08-22 Übertrager sowie Verwendung
DE4227890 1992-08-22
DE4227890A DE4227890A1 (de) 1992-08-22 1992-08-22 Übertrager mit Schirmung sowie Verwendung
DE4227891 1992-08-22

Publications (2)

Publication Number Publication Date
EP0585650A1 true EP0585650A1 (fr) 1994-03-09
EP0585650B1 EP0585650B1 (fr) 1998-01-14

Family

ID=25917768

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93112626A Expired - Lifetime EP0585650B1 (fr) 1992-08-22 1993-08-06 Transducteur et son application

Country Status (2)

Country Link
EP (1) EP0585650B1 (fr)
DE (1) DE59307977D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2797091A1 (fr) * 2013-04-25 2014-10-29 Nxp B.V. Transformateur et alimentation utilisant un tel transformateur
CN108538556A (zh) * 2018-03-21 2018-09-14 北京华峰测控技术股份有限公司 一种隔离变压器

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3705372A (en) * 1971-12-07 1972-12-05 Westinghouse Electric Corp Cast-type winding structure for electrical inductive apparatus
JPS5666021A (en) * 1979-11-02 1981-06-04 Hitachi Ltd Molded transformer
EP0185149A1 (fr) * 1984-09-24 1986-06-25 Siemens Aktiengesellschaft Bobine d'accumulation
EP0364171A2 (fr) * 1988-10-13 1990-04-18 Matsushita Electric Industrial Co., Ltd. Appareil de chauffage à haute fréquence utilisant une alimentation du type changeur de fréquence
JPH0319307A (ja) * 1989-06-16 1991-01-28 Hitachi Ferrite Ltd 磁心

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3705372A (en) * 1971-12-07 1972-12-05 Westinghouse Electric Corp Cast-type winding structure for electrical inductive apparatus
JPS5666021A (en) * 1979-11-02 1981-06-04 Hitachi Ltd Molded transformer
EP0185149A1 (fr) * 1984-09-24 1986-06-25 Siemens Aktiengesellschaft Bobine d'accumulation
EP0364171A2 (fr) * 1988-10-13 1990-04-18 Matsushita Electric Industrial Co., Ltd. Appareil de chauffage à haute fréquence utilisant une alimentation du type changeur de fréquence
JPH0319307A (ja) * 1989-06-16 1991-01-28 Hitachi Ferrite Ltd 磁心

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 15, no. 139 (E - 1053) 9 April 1991 (1991-04-09) *
PATENT ABSTRACTS OF JAPAN vol. 5, no. 129 (E - 70)<801> 19 August 1981 (1981-08-19) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2797091A1 (fr) * 2013-04-25 2014-10-29 Nxp B.V. Transformateur et alimentation utilisant un tel transformateur
CN108538556A (zh) * 2018-03-21 2018-09-14 北京华峰测控技术股份有限公司 一种隔离变压器

Also Published As

Publication number Publication date
EP0585650B1 (fr) 1998-01-14
DE59307977D1 (de) 1998-02-19

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