WO2004021375A1 - Electric transformer - Google Patents

Electric transformer Download PDF

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Publication number
WO2004021375A1
WO2004021375A1 PCT/IB2003/003268 IB0303268W WO2004021375A1 WO 2004021375 A1 WO2004021375 A1 WO 2004021375A1 IB 0303268 W IB0303268 W IB 0303268W WO 2004021375 A1 WO2004021375 A1 WO 2004021375A1
Authority
WO
WIPO (PCT)
Prior art keywords
transformer according
transformer
winding
winding elements
spiral conductor
Prior art date
Application number
PCT/IB2003/003268
Other languages
French (fr)
Inventor
Massimo Tomasi
Original Assignee
Simad S.R.L.
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 Simad S.R.L. filed Critical Simad S.R.L.
Priority to AU2003251087A priority Critical patent/AU2003251087A1/en
Publication of WO2004021375A1 publication Critical patent/WO2004021375A1/en

Links

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
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/0006—Printed inductances
    • H01F17/0013—Printed inductances with stacked layers
    • 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
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures

Definitions

  • the present invention relates to the technical field of electrotechnics, and refers to an electric transformer particularly for radiological and industrial applications.
  • transformers having primary and secondary coils carried out by windings made of electric wire and impregnated insulators.
  • a drawback of said known transformers consists in that, because of the wire winding, the characteristics of primary and secondary coils are not reproduceable with the needed precision.
  • An object of the present invention is to propose an electric transformer having characteristics, which can be industrially repeated with high precision and stable during the operation.
  • Another object is to propose a transformer minimizing the effect of the parasitic capacitances, reliable and with perfectly and homogeneously insulated turns.
  • figure 1 shows a schematic axonometric view of the transformer of the present invention
  • figure 2 shows an axonometric exploded view of transformer of figure 1
  • - figure 3 shows a plan view of an element of a winding of figure 1 transformer.
  • numeral 1 indicates the electric transformer of the present invention.
  • the transformer 1 is provided with a primary coil 2 and of two secondary coils 3, 4 whose outlets can be connected in series or in parallel.
  • Each secondary coil includes a defined number of winding elements 5, each one provided with a plate means 6 having a spiral conductor 8 whose ends have respective contacts 9, 10 of mutual in series electric connection among the winding elements 5.
  • the number of winding elements 5 of each secondary coil 3, 4 depends on the turn number of the spiral conductor 8 of the respective winding element, on the total number of turns of the respective secondary coils 3, 4, on the total number of turns of primary coil 2 and on the ratio of transformation of transformer 1.
  • the plate means 6 is carried out from a plate made of high dielectric strength insulating material having, at a face 7 thereof, the spiral conductor 8 added or carried out from a metallic layer; for instance, said plate means 6 consists of a board made of vetronite with a layer of photoengraved copper in order to carry out the spiral conductor 8 and at least a portion of the respective contacts 9, 10.
  • the thickness of the metallic layer and the track width of spiral conductor 8 decide the value of maximum current of secondary coils 3, 4, while the distance between the coils and the thickness and the material of the plate means 6 defines the insulation.
  • One or both contacts 9, 10 extend, for instance by means of a metallized hole and/or a metallic track, at the face of the plate means 6 opposed to the face having the spiral conductor 8, for the mutual connection among the winding elements 5.
  • Each plate means 6 is centrally provided with an opening 11 for the ferrite core 12 of the transformer 1 from which the opening 11 is isolated by first insulator means 15 having a tubular shape end made of solid insulating material with high dielectric strength.
  • the winding elements 5 have holes 13 for linking means, consisting of screws and nuts and the like, for mutual fixing.
  • the terminal winding elements 5 of each secondary coil 3, 4 have respective terminal insulating plates 14 made of solid insulating material and fixed by the linking means.
  • the core 12 is provided with second insulating means 16 mating the edges of the winding elements 5.
  • the primary coil 2 is carried out by a conductive wire made of copper winded in a respective seat carried out in the first insulated means 15; in alternative, the invention provides that the primary coil also can be carried out by means one or more winding elements 5, having conductors 8 with suitable section and suitable number of coils.
  • the spiral conductors 8 of winding elements 5 of secondary coils can be identical or can be provided with different numbers of turns in order to obtain predetermined ratios between the turn number of the primary coil 2 and the turn numbers of secondary coils 3, 4.
  • the number of said secondary coils can be one or greater than two in order to obtain more outlets or voltage or current values, multiple of those provide by a single secondary coil. Particularly, it is provided that each secondary coil 3, 4 can supply a maximum voltage of about 46.000 V.
  • each winding element 5 can be provided with a spiral conductor 8 on each face of plate 6 and the winding elements 5 are spaced apart by insulating means made of vetronite plates or other electric insulators.
  • the main advantage of the present invention is to provide an electric transformer stable during the operation and having characteristics, which can be industrially repeated with high precision.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Of Transformers For General Uses (AREA)

Abstract

An electric transformer is provided with a plurality of coils (2, 3, 4) at least one of which includes at least a winding element (5) provided with a plate means (6) having at least a spiral conductor (8) whose ends have respective contacts (9, 10) for electrical connection.

Description

ELECTRIC TRANSFORMER
TECHNICAL FIELD
The present invention relates to the technical field of electrotechnics, and refers to an electric transformer particularly for radiological and industrial applications.
BACKGROUND ART
There are known transformers having primary and secondary coils carried out by windings made of electric wire and impregnated insulators.
A drawback of said known transformers consists in that, because of the wire winding, the characteristics of primary and secondary coils are not reproduceable with the needed precision.
Other drawback consists in that during the operation of known transformer windings there are very high voltage gradients which increase the effect of the parasitic capacitances and which practically annul the energy transfer between primary and secondary coils, particularly during the high frequency operation.
Further drawback consists in the lack of homogeneity of insulators, for instance due to blisters, which can cause harmful electrical discharges.
DISCLOSURE OF THE INVENTION
An object of the present invention is to propose an electric transformer having characteristics, which can be industrially repeated with high precision and stable during the operation.
Other object is to propose a transformer minimizing the effect of the parasitic capacitances, reliable and with perfectly and homogeneously insulated turns.
Further object is to propose an electric transformer, particularly for high voltage and high frequency, having efficiency higher than the known transformer efficiency and having economic manufacture, since the application of insulators and the wire winding is eliminated. The above-mentioned objects are achieved according to the claim content.
BRIEF DESCRIPTION OF THE DRAWINGS
The characteristics of the present invention are underlined in the following with particular reference to the attached drawings, in which: figure 1 shows a schematic axonometric view of the transformer of the present invention; figure 2 shows an axonometric exploded view of transformer of figure 1; - figure 3 shows a plan view of an element of a winding of figure 1 transformer.
BEST MODE OF CARRYING OUT THE INVENTION
With reference to figures 1 to 3, numeral 1 indicates the electric transformer of the present invention.
The transformer 1 is provided with a primary coil 2 and of two secondary coils 3, 4 whose outlets can be connected in series or in parallel.
Each secondary coil includes a defined number of winding elements 5, each one provided with a plate means 6 having a spiral conductor 8 whose ends have respective contacts 9, 10 of mutual in series electric connection among the winding elements 5.
The number of winding elements 5 of each secondary coil 3, 4 depends on the turn number of the spiral conductor 8 of the respective winding element, on the total number of turns of the respective secondary coils 3, 4, on the total number of turns of primary coil 2 and on the ratio of transformation of transformer 1.
The plate means 6 is carried out from a plate made of high dielectric strength insulating material having, at a face 7 thereof, the spiral conductor 8 added or carried out from a metallic layer; for instance, said plate means 6 consists of a board made of vetronite with a layer of photoengraved copper in order to carry out the spiral conductor 8 and at least a portion of the respective contacts 9, 10.
The thickness of the metallic layer and the track width of spiral conductor 8 decide the value of maximum current of secondary coils 3, 4, while the distance between the coils and the thickness and the material of the plate means 6 defines the insulation.
One or both contacts 9, 10 extend, for instance by means of a metallized hole and/or a metallic track, at the face of the plate means 6 opposed to the face having the spiral conductor 8, for the mutual connection among the winding elements 5.
Each plate means 6 is centrally provided with an opening 11 for the ferrite core 12 of the transformer 1 from which the opening 11 is isolated by first insulator means 15 having a tubular shape end made of solid insulating material with high dielectric strength.
The winding elements 5 have holes 13 for linking means, consisting of screws and nuts and the like, for mutual fixing. The terminal winding elements 5 of each secondary coil 3, 4 have respective terminal insulating plates 14 made of solid insulating material and fixed by the linking means.
The core 12 is provided with second insulating means 16 mating the edges of the winding elements 5.
The primary coil 2 is carried out by a conductive wire made of copper winded in a respective seat carried out in the first insulated means 15; in alternative, the invention provides that the primary coil also can be carried out by means one or more winding elements 5, having conductors 8 with suitable section and suitable number of coils.
The spiral conductors 8 of winding elements 5 of secondary coils can be identical or can be provided with different numbers of turns in order to obtain predetermined ratios between the turn number of the primary coil 2 and the turn numbers of secondary coils 3, 4.
The number of said secondary coils can be one or greater than two in order to obtain more outlets or voltage or current values, multiple of those provide by a single secondary coil. Particularly, it is provided that each secondary coil 3, 4 can supply a maximum voltage of about 46.000 V.
Furthermore, according to the invention, each winding element 5 can be provided with a spiral conductor 8 on each face of plate 6 and the winding elements 5 are spaced apart by insulating means made of vetronite plates or other electric insulators.
The main advantage of the present invention is to provide an electric transformer stable during the operation and having characteristics, which can be industrially repeated with high precision.
Further advantage is to provide an electric transformer, particularly for high voltage and high frequency, having efficiency higher than the known transformer efficiency and having cheap manufacture, since the application of insulators and the wire winding is eliminated.
Other advantage is to provide a transformer minimizing the effect of the parasitic capacitances, reliable and with perfectly and homogeneously insulated coils.

Claims

1) Electric transformer having a plurality of coils (2, 3, 4) characterized in that at least one of said coils (2, 3, 4) includes at least a winding element (5) provided with plate means (6) having at least a spiral conductor (8), whose ends have respective contacts (9, 10) for electric junction.
2) Transformer according to claim 1 characterized in that the spiral conductor (8) is carried out on a face (7) of the plate means (6) and at least one of contacts (9, 10) extends up to the opposed face.
3) Transformer according to claim 1 characterized in that the plate means (6) is made out of a plate having a metallic layer and the spiral conductor (8), with at least a portion of the respective contacts (9, 10), is made out of said metallic layer.
4) Transformer according to claim 1 characterized in that the plate means (6) centrally has an opening (1 1) at least for a core (12) of the transformer (1).
5) Transformer according to claim 1 characterized in that at least the coil (2, 3, 4) includes a plurality of winding elements (5) whose spiral conductors (8) are electrically connected.
6) Transformer according to claim 1 characterized in that each winding element (5) is provided with a spiral conductor (8) at each face of plate means (6).
7) Transformer according to claims 5 and 6 characterized in that the winding elements (5) are spaced apart by insulating means.
8) Transformer according to claim 5 characterized in that the winding elements (5) of each coil (2, 3, 4) are reciprocally fixed by linking means engaged in holes (13) of said winding elements (5).
9) Transformer according to claim 5 characterized in that the terminal winding elements (5) of each coil (2, 3, 4) have respective insulating terminal plates (14).
10) Transformer according to claim 4 characterized in that the core (12) has a first insulating mean (15) mating edges of the opening (11).
1 1) Transformer according to claim 4 characterized in that the core (12) has a second insulating means (16) mating an edge of the winding element (5).
12) Transformer according to claim 1 characterized in that includes at least a primary coil (2) and two secondary coils (3, 4), each thereof including a plurality of winding elements (5).
13) Transformer according to claim 12 characterized in that the secondary coils (3, 4) are connected in series or in parallel.
PCT/IB2003/003268 2002-08-30 2003-08-12 Electric transformer WO2004021375A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003251087A AU2003251087A1 (en) 2002-08-30 2003-08-12 Electric transformer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO2002A000554 2002-08-30
ITBO20020554 ITBO20020554A1 (en) 2002-08-30 2002-08-30 ELECTRIC TRANSFORMER.

Publications (1)

Publication Number Publication Date
WO2004021375A1 true WO2004021375A1 (en) 2004-03-11

Family

ID=31972177

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2003/003268 WO2004021375A1 (en) 2002-08-30 2003-08-12 Electric transformer

Country Status (3)

Country Link
AU (1) AU2003251087A1 (en)
IT (1) ITBO20020554A1 (en)
WO (1) WO2004021375A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008074767A2 (en) * 2006-12-20 2008-06-26 Primozone Production Ab Power supply apparatus for a capacitive load

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4253079A (en) * 1979-04-11 1981-02-24 Amnon Brosh Displacement transducers employing printed coil structures
DE4137776A1 (en) * 1991-11-16 1993-05-19 Vacuumschmelze Gmbh Multilayer HF power transformer for resonant inverter - has soft magnetic core of which one limb passes through holes in multilayer boards carrying prim. and sec. winding tracks
EP0698896A1 (en) * 1994-08-24 1996-02-28 Yokogawa Electric Corporation Printed coil
DE29907035U1 (en) * 1999-04-20 1999-07-15 Weiner, René, 51702 Bergneustadt Coil body for a flat coil with a press-in pin header
DE19805914A1 (en) * 1998-02-13 1999-08-19 Thomson Brandt Gmbh Compact planar transformer for high frequency switched mode power supplies
US6198374B1 (en) * 1999-04-01 2001-03-06 Midcom, Inc. Multi-layer transformer apparatus and method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4253079A (en) * 1979-04-11 1981-02-24 Amnon Brosh Displacement transducers employing printed coil structures
DE4137776A1 (en) * 1991-11-16 1993-05-19 Vacuumschmelze Gmbh Multilayer HF power transformer for resonant inverter - has soft magnetic core of which one limb passes through holes in multilayer boards carrying prim. and sec. winding tracks
EP0698896A1 (en) * 1994-08-24 1996-02-28 Yokogawa Electric Corporation Printed coil
DE19805914A1 (en) * 1998-02-13 1999-08-19 Thomson Brandt Gmbh Compact planar transformer for high frequency switched mode power supplies
US6198374B1 (en) * 1999-04-01 2001-03-06 Midcom, Inc. Multi-layer transformer apparatus and method
DE29907035U1 (en) * 1999-04-20 1999-07-15 Weiner, René, 51702 Bergneustadt Coil body for a flat coil with a press-in pin header

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008074767A2 (en) * 2006-12-20 2008-06-26 Primozone Production Ab Power supply apparatus for a capacitive load
WO2008074767A3 (en) * 2006-12-20 2008-12-18 Primozone Production Ab Power supply apparatus for a capacitive load
AU2007336260B2 (en) * 2006-12-20 2011-04-07 Primozone Production Ab Power supply apparatus for a capacitive load
US8400788B2 (en) 2006-12-20 2013-03-19 Primozone Production Ab Power supply apparatus for a capacitive load
US9126832B2 (en) 2006-12-20 2015-09-08 Primozone Production Ab Power supply apparatus for a capacitive load

Also Published As

Publication number Publication date
AU2003251087A1 (en) 2004-03-19
ITBO20020554A1 (en) 2004-02-29

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