EP0464924B1 - Hochspannungstransformator, insbesondere für ein Röntgengerät - Google Patents

Hochspannungstransformator, insbesondere für ein Röntgengerät Download PDF

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Publication number
EP0464924B1
EP0464924B1 EP91201633A EP91201633A EP0464924B1 EP 0464924 B1 EP0464924 B1 EP 0464924B1 EP 91201633 A EP91201633 A EP 91201633A EP 91201633 A EP91201633 A EP 91201633A EP 0464924 B1 EP0464924 B1 EP 0464924B1
Authority
EP
European Patent Office
Prior art keywords
voltage transformer
winding
insulating
coil
voltage
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
EP91201633A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0464924A1 (de
Inventor
Hans Negle
Alfred Sachsse
Martin Wimmer
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Koninklijke Philips Electronics NV
Philips Electronics NV
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 Philips Patentverwaltung GmbH, Koninklijke Philips Electronics NV, Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Publication of EP0464924A1 publication Critical patent/EP0464924A1/de
Application granted granted Critical
Publication of EP0464924B1 publication Critical patent/EP0464924B1/de
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
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/16—Cascade transformers, e.g. for use with extra high tension
    • 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
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F2027/408—Association with diode or rectifier

Definitions

  • the invention relates to a high-voltage transformer, in particular for an X-ray device, with a high-voltage winding which contains at least one winding held by an insulating body, the winding lying against and being connected to the insulating body with a small part of its surface, and the major part the surface of the winding is arranged at a clear distance from the walls of the insulating body.
  • converter generators are used to generate the high voltage required, for which high-voltage transformers operated at frequencies of, for example, 10 kHz are required.
  • Such transformers require considerably less effort for materials and production than 50 Hz transformers.
  • the aim is to achieve the highest possible power densities in order to achieve higher continuous outputs for a given volume or to reduce the construction volume with the same output. Effective cooling measures must therefore be provided. Increased losses also arise when the operating frequencies are increased as additional copper losses due to power displacement.
  • a winding known from FR-A-12 59 104 is completely enclosed by an insulating body. Intermediate insulations are also provided between the wires of the winding. Therefore, heat generated in the winding can be dissipated poorly.
  • the invention has for its object to design an arrangement of the type mentioned in such a way that the heat can be dissipated better, so that a higher continuous output is made possible.
  • the solution is achieved in that the winding is self-supporting and dimensionally stable, free of holding bodies and / or intermediate insulation elements.
  • a winding designed according to the invention need not be held on all sides by walls of the insulating body.
  • the winding according to the invention is held on small-area receiving areas of an insulating body, so that a considerably larger proportion of the surface of the winding remains freely accessible to coolants such as oil, a high degree of stability is obtained.
  • the heat can be easily dissipated because the winding contains only a small amount of insulation.
  • windings are directly wrapped in specified winding spaces of an insulating body, irregular winding structures are created due to the considerable dimensional tolerances of the winding bodies. This causes considerable variations in the winding capacities. In particular, however, turns of a layer can be pressed into an underlying layer. As a result, the layer tension acting on such a turn can multiply. In order to prevent this, intermediate insulation layers between the winding layers have hitherto been provided. This is particularly disadvantageous if relatively high operating frequencies are used, at which the secondary high voltage is distributed over considerably fewer turns. There are high winding voltages between two in a layer of adjacent windings and correspondingly higher layer voltages between the windings of layers lying one above the other. Therefore, to increase the insulation strength of the high-voltage winding, it is provided that the winding is wound orthocyclically.
  • orthocyclic winding In the case of an orthocyclic winding, the individual turns run for most of their length in a plane orthogonal to the winding axis and are guided into the plane of the next turn over a small circumferential area. Appropriate winding technology ensures that each turn assumes an exactly predetermined position (cf. Philips Technische Rundschau 1962, No. 12, pages 401 to 404).
  • orthocyclic coils are produced in a self-supporting manner using narrowly tolerated wrapping tools, from which they can be removed in a dimensionally stable manner after an impregnation process. It is therefore ensured that the windings have an ideally uniform structure even after integration into the high-voltage transformer. Breakdowns due to uncontrolled turns are avoided.
  • the winding capacities and also the leakage inductances are practically the same for the series production units, so that these values can be included in the interaction with external capacitors used for high-voltage generation as tolerance-free fixed values.
  • the winding can be held frictionally on a mandrel of an insulating body. Attachment by gluing is also possible.
  • the windings are positively connected to the insulating bodies.
  • a suitable positive connection can be achieved by thermal deformation of the receiving cams of the insulating body.
  • An advantageous solution is characterized in that the positive connection is designed in such a way that the major part of the surface of the winding is arranged at a clear distance from adjacent walls of the insulating body. The major part of the winding surface is then exposed in contact with a coolant such as oil, so that a particularly effective cooling results.
  • a coolant such as oil
  • a stable self-supporting structure of the winding is achieved in that the turns of the winding are glued to adjacent turns. No glue needs to be applied during the winding process if the winding is wound from baked enameled wire, the outer insulating layer of which is made of a plastic that melts when exposed to heat and which "cakes" with the outer insulating layer of the neighboring turns.
  • the high-voltage winding comprises a plurality of windings, which are held by separate insulating bodies of the same type. Then only a corresponding fraction of the total high voltage needs to be taken into account for the insulation of each winding. Narrow and high windings are particularly favorable with regard to insulation strength and heat dissipation.
  • the high-voltage winding is constructed from a plurality of windings, these and the associated insulating bodies can be designed as standardized components which are suitable for a whole series of high-voltage transformers.
  • the assembly of high-voltage transformers of different voltage and power series can be carried out with similar components and with a few simple steps.
  • two windings are provided on an insulating body. If the two windings are arranged on both sides of a separating flange of the insulating body, the two windings are separated in terms of insulation and only need to be insulated with regard to the voltage applied to each winding.
  • the high-voltage winding is made up of several identical windings, their voltages can be connected in series directly or after rectification.
  • the required electrical connections can be made particularly simply in that the insulating bodies have plug-in connection elements for the electrical connection with similar neighboring insulating bodies.
  • the insulating bodies have projections arranged radially on the outside, on which electrical components such as capacitors, resistors and rectifiers are fastened and connected to windings carried by the insulating body.
  • the components to be electrically connected with a winding or a pair of windings are then in the immediate vicinity of the windings, so that there are short connection paths.
  • the outlay on insulation is reduced because the insulation sections dimensioned for the windings are also sufficient for the components which are stressed in the same way.
  • the radial lugs can be components of the insulating body or else separate components such as, in particular, printed circuit boards.
  • the electrical components can be designed conventionally or as SMD elements.
  • a damping resistor to be arranged in the circuit of an X-ray tube is arranged in the form of partial resistors distributed over the approaches of the individual insulating bodies.
  • the material, the shape and the production method of the insulating body can be chosen freely with regard to good insulation strength.
  • Insulating bodies with windings can easily be assembled as modules of the same type to form a high-voltage winding if the insulating bodies have interlocking elements for mutual, in particular latching, connection.
  • One leg of the two-part ferromagnetic core 1 carries the primary winding 3 wound on an injection-molded bobbin 2 and the secondary high-voltage winding 4, which comprises a plurality of coils 5 of the same structure.
  • Two windings 5 each form a winding module 7 with an insulating body 6 carrying them.
  • a number of winding modules 7 of the same structure are lined up on an insulating support sleeve 9, separated by intermediate insulating washers 8.
  • the electrical switching elements 13 are assigned to the windings 5 of each insulating body 6 which are connected in series. These are in particular diodes for rectifying the alternating voltage of the winding 5 and any smoothing capacitors that may be required.
  • the Direct voltages of the modules 7 form the secondary direct high voltage for operating an X-ray tube in series connection.
  • partial damping resistors are also arranged on the support segment 12.
  • the damping resistance required in the circuit of an X-ray tube to prevent excessive anode currents is divided into a number of partial resistors corresponding to the number of modules 7, the insulation of which must only be measured for a fraction of the total high voltage. While previously there had to be space for a single damping resistor which was dimensioned to be complex and of large volume, in the case of the inexpensive embodiment according to the invention only a minimal installation space is required. External and high-voltage-proof switching connections are not required.
  • FIG. 1a shows, on an enlarged scale, a cross section through a support body 6 and the windings 5 arranged thereon in the region of the transformer core window (on the left in FIG. 1).
  • the cross section of the support body is double-T-shaped and forms two ring segment chambers which accommodate the winding 5.
  • the windings 5 are self-supporting and orthocyclically wound according to the invention. They were wrapped out of baked enamel wire in a dimensionally accurate winding tool with precisely specified winding routing. The caking can take place during the winding, for example by hot air or infrared radiation, or after the winding by heating. The windings 5 were then removed from the winding form as dimensionally stable units.
  • the windings are pushed onto three narrow support cams 14 of the insulating body 6 molded from thermoplastic material and fixed by melting the material of the supporting cams (elevation 15) at a free distance from the walls of the insulating body 6. In this way, almost the entire surface of the winding 5 is free for circulating oil which cools by convection.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • X-Ray Techniques (AREA)
  • Insulating Of Coils (AREA)
EP91201633A 1990-07-06 1991-06-27 Hochspannungstransformator, insbesondere für ein Röntgengerät Expired - Lifetime EP0464924B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4021585 1990-07-06
DE4021585A DE4021585A1 (de) 1990-07-06 1990-07-06 Hochspannungstransformator, insbesondere fuer ein roentgengeraet

Publications (2)

Publication Number Publication Date
EP0464924A1 EP0464924A1 (de) 1992-01-08
EP0464924B1 true EP0464924B1 (de) 1995-03-15

Family

ID=6409804

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91201633A Expired - Lifetime EP0464924B1 (de) 1990-07-06 1991-06-27 Hochspannungstransformator, insbesondere für ein Röntgengerät

Country Status (4)

Country Link
US (1) US5225803A (ja)
EP (1) EP0464924B1 (ja)
JP (1) JP3490098B2 (ja)
DE (2) DE4021585A1 (ja)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5576681A (en) * 1990-12-10 1996-11-19 Deutsche Thomson-Brandt Gmbh High voltage transformer
DE59309571D1 (de) * 1992-08-04 1999-06-17 Thomson Brandt Gmbh Hochspannungs-Zeilentransformator für einen Fernsehempfänger
DE4343930C2 (de) * 1993-05-04 1996-07-18 Siemens Ag Röntgengenerator
US5594402A (en) * 1995-06-02 1997-01-14 International Power Group, Inc. High voltage isolating transformer module
FR2752642B1 (fr) * 1996-08-20 1998-11-06 Thomson Csf Transformateur-redresseur t.h.t. pour montage en surface
US6760206B2 (en) 2001-03-16 2004-07-06 Cooper Industries, Inc. Current sensor supporting structure
US7932799B2 (en) * 2004-09-24 2011-04-26 Koninklijke Philips Electronics N.V. Transformer
US7956714B2 (en) * 2005-12-16 2011-06-07 Koninklijke Philips Electronics N.V. High voltage transformer
US7903432B2 (en) * 2009-05-29 2011-03-08 General Electric Company High-voltage power generation system and package
WO2012000984A1 (en) * 2010-06-28 2012-01-05 Abb Technology Ag Coil for transformers made from coil segments with locking means
WO2015091202A1 (en) * 2013-12-19 2015-06-25 Koninklijke Philips N.V. High voltage transformer comprising a coil bobbin for carrying a high voltage winding
CN104183364B (zh) 2014-06-23 2016-10-05 上海联影医疗科技有限公司 高压发生器变压油箱

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1259104A (fr) * 1960-05-03 1961-04-21 Philips Nv Bobinage et son procédé de fabrication
US3665288A (en) * 1970-09-02 1972-05-23 Zenith Radio Corp Television sweep transformer
BE791522A (fr) * 1971-11-18 1973-03-16 Matsushita Electric Ind Co Ltd Transformateur haute tension associe a un circuit a diviation horizontale
US4338657A (en) * 1974-05-21 1982-07-06 Lisin Vladimir N High-voltage transformer-rectifier device
NL7713118A (nl) * 1977-11-29 1979-05-31 Philips Nv Hoogspanningstransformator.
NL8200233A (nl) * 1982-01-22 1983-08-16 Philips Nv Hoogspanningsopwekker voor een rontgengenerator.
DE3311775C1 (de) * 1983-03-31 1984-06-20 Deutsche Thomson-Brandt Gmbh, 7730 Villingen-Schwenningen Transformator fuer die Ablenkung von Elektronenstrahlen
US4609900A (en) * 1984-06-26 1986-09-02 Bruno Bachhofer High-voltage transformer with liquid cooling
DE3605629A1 (de) * 1986-02-21 1987-09-03 Koch & Sterzel Kg Hochspannungstransformator
SU1372391A1 (ru) * 1986-07-30 1988-02-07 Ленинградское научно-производственное объединение "Буревестник" Каскадный умножитель напр жени
US4967121A (en) * 1987-05-27 1990-10-30 Rca Licensing Corporation Isolating high voltage transformer for video apparatus
US4982498A (en) * 1987-12-03 1991-01-08 Mitsubishi Denki Kabushiki Kaisha Method of making a high-voltage transformer
DE3929888A1 (de) * 1989-09-08 1991-03-14 Philips Patentverwaltung Roentgengenerator zum betrieb einer roentgenroehre mit an masse angeschlossenen roehrenteilen

Also Published As

Publication number Publication date
EP0464924A1 (de) 1992-01-08
DE4021585A1 (de) 1992-01-09
US5225803A (en) 1993-07-06
JPH04233206A (ja) 1992-08-21
JP3490098B2 (ja) 2004-01-26
DE59104941D1 (de) 1995-04-20

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