EP0508521A1 - Transformer - Google Patents
Transformer Download PDFInfo
- Publication number
- EP0508521A1 EP0508521A1 EP92200897A EP92200897A EP0508521A1 EP 0508521 A1 EP0508521 A1 EP 0508521A1 EP 92200897 A EP92200897 A EP 92200897A EP 92200897 A EP92200897 A EP 92200897A EP 0508521 A1 EP0508521 A1 EP 0508521A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- transformer
- core
- portions
- limb
- windings
- 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.)
- Withdrawn
Links
Images
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
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
Definitions
- the invention relates to a transformer, comprising a core which is made of a soil-magnetic material and which comprises at least one limb on which a first and a second transformer winding are provided one behind the other in the axial direction, said first and second transformer windings being isolated from one another by an electrically insulating member, said core comprising two portions, each of which comprises at least a portion of the limb and is arranged so that the limb portions face one another and are situated one in the prolongation of the other.
- a transformer of this kind is known from DE-A-1 932 174.
- the first transformer winding constitutes, for example the primary winding and is then generally connected directly or indirectly to the power supply mains.
- the second winding (constituting the secondary winding) should then be adequately electrically isolated from the first winding.
- the requirement is that the distance between the first and the second winding should at least have a given value through the air (air path) as well as via solid surfaces (creepage path).
- a customary requirement as regards the creepage path is, for example at least 6 mm.
- the electrically insulating member arranged between the first and the second coil former serves to increase the air and creepage paths without substantially increasing the dimensions of the transformer.
- the ends of the first and the second coil former which are remote from one another must be provided with comparatively thick flanges because otherwise the distance between the two windings and the core would become inadmissibly small. This is because the core, to be considered to be electrically conductive, would then constitute a conductive connection between the two windings.
- the thick flanges have the drawback that they increase the dimensions of the transformer.
- the transformer in accordance with the invention is characterized in that the insulating member comprises a flat plate which extends transversely of the longitudinal direction of the limb and which constitutes a partition between the core portions and projects a predetermined distance beyond the circumference of the core and the transformer windings in all directions.
- the plate constitutes a complete electrical insulation not only between the first and the second winding but also between the core portions on which the first and the second coil former are provided.
- the transformer in accordance with the invention essentially consists of two electrically fully isolated portions.
- a preferred embodiment of the transformer in accordance with the invention is characterized in that the plate extends at least 3 mm beyond the circumference of the core and the transformer windings in all directions.
- An embodiment of the transformer in accordance with the invention which can be particularly simply and inexpensively manufactured is characterized in that the first and the second transformer winding are provided on a first and a second coil former, respectively, which coil formers constitute, in conjunction with the plate, a coil support in the form of an integral unit made of a suitable, electrically insulating plastic.
- the transformer shown in the Figs. 1 and 2 comprises a core which is made of a soft-magnetic material, for example ferrite, and which consists of a first portion 1a and a second portion 1b.
- Each core portion 1a, 1b in the embodiment shown is E-shaped. It comprises a portion 3a, 3b of a limb (denoted by a dashed line in Fig. 2) and a portion 5a, 5b of a yoke.
- the core portions 1a and 1b are arranged so that the limb portions 3a and 3b face one another and are arranged one in the prolongation of the other in order to form a straight, rod-shaped limb, the yoke portions 5a and 5b forming an annular yoke surrounding the limb.
- a flat plate 11 which extends transversely of the longitudinal direction of the limb 3a, 3b and which constitutes, in conjunction with the coil formers, a coil support which is made as an integral unit of a suitable, electrically insulating plastic, for example by injection moulding.
- the plate 11 constitutes a partition between the two core portions 1a, 1b and between the two transformer windings 9a, 9b, so that the transformer consists of two portions which are electrically fully isolated from one another.
- the length of the creepage paths for electric current, existing between these portions, is determined by the degree of projection of the plate 11 beyond the circumference of the core 1a, 1b and the transformer windings 9a, 9b.
- the plate 11 preferably projects a distance d of at least 3 mm beyond this circumference in all directions. In Fig. 1 the distance d is measured, in the horizontal as well as in the vertical direction, between the edge of the plate 11 and the nearest surface of the core 1a, 1b.
- the distance d in the vertical direction should be measured between the upper side of the relevant winding and the edge of the plate 11.
- the length of the creepage path between the two transformer portions amounts to 2d plus the thickness of the plate 11 (approximately 0.4 mm).
- the air path between the transformer portions always equals at least the creepage path in the described construction. When d equals 3 mm, the creepage path thus amounts to at least 6 mm.
- the transverse dimensions of the transformer (width and height in Fig. 1) can be very small despite the comparatively long creepage path, for example no more than 25 mm.
- flanges 13a, 13b which bound the transformer windings 9a, 9b in the axial direction in conjunction with the plate 11. Because the transformer consists of two electrically isolated portions due to the plate 11, it is not strictly necessary to insulate the transformer windings electrically from the core portions 1a, 1b. Therefore, if desirable, the coil formers 7a, 7b and the flanges 13a, 13b can be omitted.
- each core portion there is provided a contact strip 15a, 15b which is made of an electrically insulating plastic and in which there are secured connection pins 17a, 17b which are electrically connected to the transformer windings 9a, 9b and which can be soldered, for example into a printed circuit board.
- the contact strips 15a, 15b may form part of said coil support. However, they may alternatively be separately manufactured and bonded to the core 1a, 1b, for example by means of a suitable adhesive. In the absence of coil formers 7a, 7b, the plate 11 can also be bonded to the core portions 1a, 1b by means of a suitable adhesive.
- the core of the described embodiment consists of two E-shaped portions 1a, 1b.
- the invention can be used equally well for transformers comprising cores formed in a different manner and comprising more than one portion, for example cores consisting of I-shaped or C-shaped portions.
- the limb is formed by the portion of the core on which the windings are wound one behind the other, in the axial direction.
- the presence of the plate 11 between the core portions 1a, 1b means that an air gap is present in the magnetic circuit formed by these core portions. This may be advantageous because in some applications a transformer comprising an air gap may be necessary or desirable.
- the thickness of the plate 11 can be readily adapted to the desired size of the air gap. In the event of a very small air gap, the plate 11 may consist of one or more layers of a very thin, plastic foil.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Or Transformers For Communication (AREA)
- Insulating Of Coils (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP91200816 | 1991-04-09 | ||
EP91200816 | 1991-04-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0508521A1 true EP0508521A1 (en) | 1992-10-14 |
Family
ID=8207600
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92200897A Withdrawn EP0508521A1 (en) | 1991-04-09 | 1992-03-30 | Transformer |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0508521A1 (ja) |
JP (1) | JPH05129143A (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999063556A1 (en) * | 1998-05-30 | 1999-12-09 | Profec Technologies Limited | Safety isolating transformer |
WO2001056045A1 (en) * | 2000-01-27 | 2001-08-02 | Koninklijke Philips Electronics N.V. | Transformer having insulation means formed by a mounting plate suitable for a printed circuit |
WO2002104076A1 (en) * | 2001-06-15 | 2002-12-27 | E2V Technologies Limited | Galvanically isolated delivery of power to high voltage circuits parts |
US8284009B2 (en) | 2007-12-06 | 2012-10-09 | Fdk Corporation | Transformer |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR452011A (fr) * | 1912-06-08 | 1913-05-05 | Riccardo Arno | Système de production et de sureté pour l'immunité des personnes et contre les dangers d'incendie dans les installations électriques, fondé sur l'emploi d'un transformateur fonctionnant comme appareil de sureté |
FR2160688A1 (ja) * | 1971-11-20 | 1973-06-29 | Flako Ag | |
US4405913A (en) * | 1981-08-17 | 1983-09-20 | Mid-West Transformer Company | Coil body |
DE3700488A1 (de) * | 1987-01-08 | 1988-07-21 | Klaus Dipl Ing Becker | Leistungsuebertrager mit ferromagnetischem kern |
-
1992
- 1992-03-30 EP EP92200897A patent/EP0508521A1/en not_active Withdrawn
- 1992-04-08 JP JP4087196A patent/JPH05129143A/ja active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR452011A (fr) * | 1912-06-08 | 1913-05-05 | Riccardo Arno | Système de production et de sureté pour l'immunité des personnes et contre les dangers d'incendie dans les installations électriques, fondé sur l'emploi d'un transformateur fonctionnant comme appareil de sureté |
FR2160688A1 (ja) * | 1971-11-20 | 1973-06-29 | Flako Ag | |
US4405913A (en) * | 1981-08-17 | 1983-09-20 | Mid-West Transformer Company | Coil body |
DE3700488A1 (de) * | 1987-01-08 | 1988-07-21 | Klaus Dipl Ing Becker | Leistungsuebertrager mit ferromagnetischem kern |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999063556A1 (en) * | 1998-05-30 | 1999-12-09 | Profec Technologies Limited | Safety isolating transformer |
AU752951B2 (en) * | 1998-05-30 | 2002-10-03 | Profec Technologies Limited | Safety isolating transformer |
WO2001056045A1 (en) * | 2000-01-27 | 2001-08-02 | Koninklijke Philips Electronics N.V. | Transformer having insulation means formed by a mounting plate suitable for a printed circuit |
WO2002104076A1 (en) * | 2001-06-15 | 2002-12-27 | E2V Technologies Limited | Galvanically isolated delivery of power to high voltage circuits parts |
US7221558B2 (en) | 2001-06-15 | 2007-05-22 | E2V Technologies (Uk) Limited | Galvanically isolated delivery of power to high voltage circuits parts |
US8284009B2 (en) | 2007-12-06 | 2012-10-09 | Fdk Corporation | Transformer |
CN101896984B (zh) * | 2007-12-06 | 2012-10-10 | 富士电气化学株式会社 | 变压器 |
Also Published As
Publication number | Publication date |
---|---|
JPH05129143A (ja) | 1993-05-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19930415 |