EP1256119A1 - Encapsulated transformer - Google Patents

Encapsulated transformer

Info

Publication number
EP1256119A1
EP1256119A1 EP00955937A EP00955937A EP1256119A1 EP 1256119 A1 EP1256119 A1 EP 1256119A1 EP 00955937 A EP00955937 A EP 00955937A EP 00955937 A EP00955937 A EP 00955937A EP 1256119 A1 EP1256119 A1 EP 1256119A1
Authority
EP
European Patent Office
Prior art keywords
transformer
assembly
cover
shell
transparent
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
EP00955937A
Other languages
German (de)
French (fr)
Other versions
EP1256119B1 (en
Inventor
Branimir Jakovlejvic
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1256119A1 publication Critical patent/EP1256119A1/en
Application granted granted Critical
Publication of EP1256119B1 publication Critical patent/EP1256119B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • H01F27/02—Casings
    • H01F27/022—Encapsulation
    • 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
    • H01F27/02—Casings

Definitions

  • THIS invention relates to transformers and other apparatus comprising
  • transformers such as power supplies.
  • the cap is normally mounted on the board to abut against the
  • the cover is preferably transparent.
  • the transformer may also comprise a
  • the cover may be in the form of a skin.
  • the skin may comprise a transparent outer shell of a rigid material and a
  • the shell may comprise first and second body halves fitted
  • the skin may comprise outwardly extending protrusions, to provide a
  • the cover may be in the form of a box and may
  • the transformer may form part of power supply circuitry and the power
  • supply circuitry may comprise a first output which is accessible through the
  • the power supply circuitry may further comprise a second output
  • the circuitry may comprise a fuse, and the fuse is preferably provided in a
  • the cover may comprise a lid for opening and closing the recess.
  • the transformer may be enclosed by locating the transformer in a rigid
  • the transformer may be located by providing a rigid transparent shell having
  • figure 1 is a diagrammatic perspective view of a prior art transformer
  • figure 2 is a diagrammatic exploded perspective view of a transformer
  • figure 3 is a diagrammatic perspective view of the assembly in figure 2
  • figure 4 is a diagrammatic perspective view from above of a power
  • figure 5 is a diagrammatic perspective view form below of the power
  • figure 6 is a basic block diagram of the power supply in figure 4.
  • the assembly comprises a transformer (not shown)
  • thermosetting epoxy resin 1 6 is provided in the cap to embed the transformer, thereby to insulate it electrically and to mount it permanently
  • the transformer to external circuitry (also not shown) .
  • a transformer assembly according to the invention is generally designated
  • the assembly comprises a
  • transformer 30 comprising a transparent bobbin 22 made of a suitable
  • a stack 23 of magnetic material laminates extend
  • insulating tape is provided about the windings, as is the case in some
  • Conductive legs 28 are of known transformers, and transformer assemblies. Conductive legs 28 are of known transformers, and transformer assemblies. Conductive legs 28 are of known transformers, and transformer assemblies. Conductive legs 28 are of known transformers, and transformer assemblies. Conductive legs 28 are of known transformers, and transformer assemblies. Conductive legs 28 are of known transformers, and transformer assemblies. Conductive legs 28 are of known transformers, and transformer assemblies. Conductive legs 28 are of known transformers, and transformer assemblies. Conductive legs 28 are
  • the assembly further comprises first and second body halves 32, 34 of a
  • the shell having a shape and configuration substantially similar to the
  • Second body half 34 defines an opening 36 in a center
  • the material may be introduced by means of a suction
  • the assembly thus comprises a thin transparent skin 38 (shown in figure 3)
  • the legs 28 extend beyond the body half 34, so that the assembly 20 may
  • the feet 33 ensures that a permanent clearance is provided between the
  • the assembly may define holes 40 in ear regions 42, 44, of the bobbin 22
  • the power supply assembly 50 comprises a transparent
  • the cover 52 facilitates the transmission of
  • the cover comprises a plurality of pins 58 (two or three) for cooperating
  • the cavity is openable and closeable by a removable lid
  • the cover defines a first opening providing access to a first pair of DC
  • output terminals 66 from the power supply.
  • a second pair of output terminals 68 connected in parallel with the first pair is also accessible
  • FIG. 6 A block diagram of the power supply is shown in figure 6. The
  • aforementioned pins are designated 58 and are connected to protective
  • circuitry 70 comprising lightning protection circuitry and the primary
  • a voltage regulating circuit 76 is connected to a voltage regulating circuit 76 and the regulating circuit is
  • the fuse 62 may be

Abstract

An encapsulated transformer assembly (20) comprises a transformer (30) enclosed by a transparent electricity insulating skin (32, 34). The transparent skin facilitates heat exchange resulting in more effective operation in use.

Description

ENCAPSULATED TRANSFORMER
TECHNICAL FIELD
THIS invention relates to transformers and other apparatus comprising
transformers, such as power supplies.
BACKGROUND ART
It is known electrically to insulate a transformer by centralizing the
transformer in an opaque plastic cap having a substantially rectilinear shape
and an open bottom and to fill the region between the transformer and
inside walls of the cap with an opaque insulating material. The material
normally forms a concave bottom wall in a region between the transformer
and a bottom of the cap. In use, heat is generated by the transformer and
since neither the cap nor the intermediate insulating material transmits heat
effectively, that heat is not dissipated effectively. This may cause damage
to the transformer or may at least give rise to higher electrical losses . This
problem is also encountered in other apparatus comprising transformers,
such as power supplies.
Furthermore, the aforementioned transformer assembly is normally mounted
on a printed circuit board by a plurality of legs extending from electrical
terminals on the transformer to a region beyond the aforementioned bottom of the cap. The cap is normally mounted on the board to abut against the
board and as a consequence, a cavity is formed between the board and the
aforementioned bottom wall. In use and as a result of variations in
temperature in the cavity, air-entraining moisture moves into and is trapped
in the cavity. Over a period of time, this moisture causes damage to the
printed circuit board.
OBJECTIVE OF THE INVENTION
Accordingly, it is an object of the present invention to provide apparatus
and a method of producing same with which the applicant believes the
aforementioned disadvantages may at least be alleviated.
SUMMARY OF THE INVENTION
According to the invention there is provided an electric assembly
comprising a transformer and a translucent electricity insulting cover
therefor.
The cover is preferably transparent. The transformer may also comprise a
transparent bobbin on which a core for the transformer and transformer
windings are provided. In one embodiment the cover may be in the form of a skin.
The skin may comprise a transparent outer shell of a rigid material and a
layer of a transparent filling material provided between the shell and the
transformer. The shell may comprise first and second body halves fitted
together to form the shell.
The skin may comprise outwardly extending protrusions, to provide a
clearance between the skin and a surface on which the assembly is
mounted in use.
In another embodiment, the cover may be in the form of a box and may
comprise a plurality of pins for mating with and making electrical contract
with a conventional socket arrangement.
The transformer may form part of power supply circuitry and the power
supply circuitry may comprise a first output which is accessible through the
cover. The power supply circuitry may further comprise a second output
which is in parallel with the first output and which is also accessible
through the cover. The circuitry may comprise a fuse, and the fuse is preferably provided in a
recess in the cover.
The cover may comprise a lid for opening and closing the recess.
Also included within the scope of the invention is a method of forming an
electric assembly, the method comprising the steps of:
providing a transformer; and
permanently enclosing the transformer in a translucent electricity
insulating cover.
The transformer may be enclosed by locating the transformer in a rigid
transparent shell.
The transformer may be located by providing a rigid transparent shell having
a shape substantially the same as a general shape of the transformer;
mounting the transformer in the shell so that a small clearance is defined
between substantially a whole of an outer surface of the transformer and
the shell; and filling the clearance with a transparent electricity insulating
material. BRIEF DESCRIPTION OF THE ACCOMPANYING DIAGRAMS
The invention will now further be described, by way of example only, with
reference to the accompanying diagrams wherein:
figure 1 is a diagrammatic perspective view of a prior art transformer
assembly;
figure 2 is a diagrammatic exploded perspective view of a transformer
assembly according to the invention;
figure 3 is a diagrammatic perspective view of the assembly in figure 2,
in assembled form;
figure 4 is a diagrammatic perspective view from above of a power
supply assembly according to the invention;
figure 5 is a diagrammatic perspective view form below of the power
supply assembly; and
figure 6 is a basic block diagram of the power supply in figure 4.
DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
A prior art transformer assembly is generally designated by the reference
numeral 1 0 in figure 1 . The assembly comprises a transformer (not shown)
mounted in an opaque cap 1 2 defining an open bottom 14. A body of an
opaque thermosetting epoxy resin 1 6 is provided in the cap to embed the transformer, thereby to insulate it electrically and to mount it permanently
in the cap.
Four conductive legs 1 8 connected to terminals (not shown) of the
transformer extend beyond a concave bottom wall 1 7 formed by the resin
and also beyond the open bottom 1 4 of the cap and are used to connect
the transformer to external circuitry (also not shown) .
The disadvantages of this assembly are referred to in the introduction of
this specification.
A transformer assembly according to the invention is generally designated
by the reference numeral 20 in figure 2. The assembly comprises a
transformer 30 comprising a transparent bobbin 22 made of a suitable
plastics material. A stack 23 of magnetic material laminates extend
through and around the bobbin, to form the magnetic core of the
transformer. The primary winding 24 and the secondary winding 26 of the
transformer are provided on the bobbin in known manner. However, no
insulating tape is provided about the windings, as is the case in some
known transformers, and transformer assemblies. Conductive legs 28 are
connected to input and output terminals (not shown) of the transformer 30. The assembly further comprises first and second body halves 32, 34 of a
translucent, preferably transparent permanent shell 31 (shown in figure 3)
of a suitable rigid plastics material. The two body halves collectively form
the shell having a shape and configuration substantially similar to the
general external shape of the transformer 30. When assembled, there is
defined a small clearance between the shell 31 and the transformer 30
enclosed thereby. Second body half 34 defines an opening 36 in a center
region thereof.
When making the assembly and after the shell 31 has been formed by
clipping body halves 32 and 34 together, a transparent thermosetting
material is introduced into the shell via opening 36 to fill the clearance, to
form a thin layer between the transformer and shell and to displace air
inside the shell. The material may be introduced by means of a suction
mechanism and process. The material is then allowed to cure.
The assembly thus comprises a thin transparent skin 38 (shown in figure 3)
for the transformer constituted by the transparent layer 37 and the
transparent shell 31 . On body half 34, a plurality of externally extending protrusions or feet 33
are provided. When the assembly is mounted on a surface (not shown) the
feet ensures that there is a permanent clearance (also not shown) between
the shell 31 and the surface. This clearance improves heat exchange
between the assembly and the environment.
The legs 28 extend beyond the body half 34, so that the assembly 20 may
be mounted on printed circuit boards (not shown) in well known manner.
The feet 33 ensures that a permanent clearance is provided between the
assembly and the printed circuit board, to facilitate circulation of air
between the transformer and the board and which improves the dissipation
of heat generated by the transformer.
It is believed that with the transparent bobbin 22, no insulation type about
the windings (24, 26) and the thin transparent skin 38, heat generated by
the transformer is transmitted outwardly more effectively than is the case
with the aforementioned prior art transformers.
The assembly may define holes 40 in ear regions 42, 44, of the bobbin 22
and body half 34 respectively. These holes, which are easily accessible
from a region in line with the centre axes of the holes, could be used to mount the transponder on a chassis 46 by means of screws 48 or bolts and
nuts, for example.
Accordingly, the compact assembly according to the invention is suitable
for both so-called printed circuit board and chassis mount.
In figures 4 and 5, there is shown a power supply assembly 50 according
to the invention. The power supply assembly 50 comprises a transparent
or translucent cover in the form of a box 52 for power supply circuitry 54,
comprising a transformer 56. The cover 52 facilitates the transmission of
heat generated by the circuitry.
The cover comprises a plurality of pins 58 (two or three) for cooperating
with a conventional socket arrangement (not shown) of a mains power
supply network. In a base 52.1 of the cover, there is provided a cavity 60
for a replaceable fuse 62 connected in either a primary or secondary circuit
of the transformer. The cavity is openable and closeable by a removable lid
64.
The cover defines a first opening providing access to a first pair of DC
output terminals 66 from the power supply. A second pair of output terminals 68 connected in parallel with the first pair is also accessible
through the cover.
A block diagram of the power supply is shown in figure 6. The
aforementioned pins are designated 58 and are connected to protective
circuitry 70 comprising lightning protection circuitry and the primary
winding 72 of the transformer. A secondary winding 74 of the transformer
is connected to a voltage regulating circuit 76 and the regulating circuit is
connected to the output terminals 66 and 68. The fuse 62 may be
connected in the primary and/or the secondary circuit of the transformer.
It will be appreciated that there are many variations in detail on the
apparatus and method according to the invention without departing from
the scope and spirit of the appended claims.

Claims

1 . An electric assembly comprising a transformer and a translucent
electricity insulting permanent cover therefor.
2. An assembly as claimed in claim 1 wherein the cover is transparent.
3. An assembly as claimed in any one of the preceding claims wherein
the transformer comprises a transparent bobbin on which a core for
the transformer and transformer windings are provided.
4. An assembly as claimed in any one of the preceding claims wherein
the cover is in the form of a skin.
5. An assembly as claimed in claim 4 wherein the skin comprises a
transparent outer shell of a rigid material and a layer of a transparent
filling material provided between the shell and the transformer.
6. An assembly as claimed in claim 5 wherein the shell comprises first
and second body halves fitted together to form the shell.
7. An assembly as claimed in any one of claims 4 to 6 wherein the skin
comprises outwardly extending protrusions, to provide a clearance
between the skin and a surface on which the assembly is mounted in
use.
8. An assembly as claimed in any one of claims 1 to 3 wherein the
cover comprises a plurality of pins for mating with and making
electrical contract with a conventional socket arrangement.
9. An assembly as claimed in claim 8 wherein the transformer forms
part of power supply circuitry, the power supply circuitry comprising
a first output which is accessible through the cover.
1 0. An assembly as claimed in claim 9 wherein the power supply
circuitry comprises a second output which is in parallel with the first
output and also accessible through the cover.
1 1 . An assembly as claimed in any one of claims 9 and 1 0 wherein the
circuitry comprises a fuse and the fuse is provided in a recess in the
cover.
1 2. An assembly as claimed in claim 1 1 wherein the cover comprises a
lid for opening and closing the recess.
1 3. A method of forming an electric assembly, the method comprising
the steps of:
providing a transformer; and
permanently enclosing the transformer in a translucent
electricity insulating cover.
14. A method as claimed in claim 1 3 wherein the transformer is enclosed
by locating the transformer in a rigid transparent shell.
1 5. A method as claimed in claim 14 wherein the transformer is located
by providing a rigid transparent shell having a shape substantially the
same as a general shape of the transformer; mounting the
transformer in the shell so that a small clearance is defined between
substantially a whole of an outer surface of the transformer and the
shell; and filling the clearance with a transparent electricity insulating
material.
1 6. An electric assembly substantially as herein described with reference
to the accompanying diagrams.
17. An transformer assembly substantially as herein described with
reference to the accompanying diagrams.
1 8. A power supply assembly substantially as herein described with
reference to the accompanying diagrams.
1 9. A method of forming an electric assembly substantially as herein
described with reference to the accompanying diagrams.
EP00955937A 1999-08-19 2000-08-18 Encapsulated transformer Expired - Lifetime EP1256119B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ZA995296 1999-08-19
ZA9905296 1999-08-19
PCT/ZA2000/000140 WO2001013385A1 (en) 1999-08-19 2000-08-18 Encapsulated transformer

Publications (2)

Publication Number Publication Date
EP1256119A1 true EP1256119A1 (en) 2002-11-13
EP1256119B1 EP1256119B1 (en) 2009-04-15

Family

ID=25587862

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00955937A Expired - Lifetime EP1256119B1 (en) 1999-08-19 2000-08-18 Encapsulated transformer

Country Status (8)

Country Link
EP (1) EP1256119B1 (en)
CN (1) CN1269149C (en)
AT (1) ATE429021T1 (en)
AU (1) AU6805400A (en)
CA (1) CA2420312A1 (en)
DE (1) DE60042033D1 (en)
HK (1) HK1051437A1 (en)
WO (1) WO2001013385A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2822586B1 (en) * 2001-03-20 2003-06-20 Aupem Sefli OVER-MOLDED HIGH-VOLTAGE ELECTRIC TRANSFORMER
CN102313844A (en) * 2011-07-29 2012-01-11 牡丹江电业局 Portable multifunctional test power supply device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4008205A (en) * 1962-11-06 1977-02-15 Imperial Chemical Industries Limited Polysulphones as insulators
JPS5352922A (en) * 1976-10-25 1978-05-13 Hitachi Ltd Mold transformer
JPS5743405A (en) * 1980-08-29 1982-03-11 Hitachi Ltd Manufacture of molded flyback type transformer
CA2062608A1 (en) * 1991-04-18 1992-10-19 Steven W. Tanamachi Two-part sensor with transformer power coupling and optical signal coupling
DE69839900D1 (en) * 1997-02-18 2008-10-02 Canon Kk Transformer and its use, and transformer mounting method.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0113385A1 *

Also Published As

Publication number Publication date
CA2420312A1 (en) 2001-02-22
EP1256119B1 (en) 2009-04-15
HK1051437A1 (en) 2003-08-01
CN1379907A (en) 2002-11-13
AU6805400A (en) 2001-03-13
DE60042033D1 (en) 2009-05-28
ATE429021T1 (en) 2009-05-15
WO2001013385A1 (en) 2001-02-22
CN1269149C (en) 2006-08-09

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