EP0684617B1 - Multi-layered insulated wire for high frequency transformer winding - Google Patents
Multi-layered insulated wire for high frequency transformer winding Download PDFInfo
- Publication number
- EP0684617B1 EP0684617B1 EP95113100A EP95113100A EP0684617B1 EP 0684617 B1 EP0684617 B1 EP 0684617B1 EP 95113100 A EP95113100 A EP 95113100A EP 95113100 A EP95113100 A EP 95113100A EP 0684617 B1 EP0684617 B1 EP 0684617B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- conductor
- wire
- winding
- insulating
- heat
- 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
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
- H01B7/0275—Disposition of insulation comprising one or more extruded layers of insulation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
- H01B7/0241—Disposition of insulation comprising one or more helical wrapped layers of insulation
-
- 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
- H01F27/323—Insulation between winding turns, between winding layers
Definitions
- This device relates to an insulated wire for a winding suited to be used in a high frequency transformer, a high frequency reactor, or a high frequency coil used in such devices such as a switching power source.
- a magnet wire manufactured by forming an insulating layer made of such a material as polyurethane resin or polyester resin on a single wire conductor has been used as an insulated wire for a winding for a switching power source.
- a safety transformer for such a device as a switching power source must follow the following restrictions based on IEC International Electrotechnical Commission) or UL (Standards of Underwriter's Laboratories, Inc.,) as well as on other various types of safety standard;
- this invention proposed use of a 3-layered insulated wire for a winding to be used in a transformer, as described in Japanese Utility Model Application No. 49802/1990, Japanese Patent Application laid-open No.4042515/1992, Japanese Utility Model Application No. 49801/1990, and EP-A-0 258 036 which describes a multi-layered insulated wire according to the preamble of claim 1, and now it is possible to satisfy the safety standards such as IEC or UL.
- a high frequency in a range from several tens KHz to several hundreds KHz is now used for a switching frequency to improve the switching efficiency.
- This invention was made to solve the problems as described above, and the object is to provide an insulated electric wire for a winding to be used in a transformer, which satisfies the various types of requirements for safety as described above and can contribute to reduction of heat emission from a transformer even if the switching frequency is in a high frequency band area.
- this invention provides a multi-layered insulated wire for a winding to be used in a high frequency transformer comprising:
- the aforesaid bundled insulated conductor according to this invention may be manufactured by bundling a plurality of the aforesaid insulated element wires almost in parallel to each other into a conductor having a round cross section, or by bundling a plurality of the aforesaid insulated element wires by twisting said element wires by means of bundle-twisting, co-axial twisting, or litz twisting.
- a small diameter wire such as a copper wire, a copper-alloy wire, or a tin- or solder-plated copper wire is used as a conductor for the element wire.
- a size of this small diameter conductor is in a range from 0. 08 mm (AWG 40) to 0.20 mm (AEG 32).
- a layer manufactured by winding a heat-resistant plastic film such as, for instance, a polyimide film, an aromatic polyamide film, a polyether ether ketone film, a polyphenylene sulfide (PPS) film, or a polyester film in an overlapped relation is used.
- a heat-sensing adhesive layer may be arranged on the aforesaid heat-resistant plastic film, and after said film is wound around a conductor, heat may be applied to integrate the heat-sensing adhesive layer with the heat-resistant film.
- films having different colors may be used for each layer respectively, or each layer may be colored differently by employing such a method as adding a specific dyestuff to a heat-sensing adhesive layer for a film with a heat-sensing adhesive layer to color each layer differently, to clearly identify each insulating layer.
- an extruded layer made of a heat-resistant resin an extruded layer manufactured by extruding a heat-resistant resin such as various types of fluorine resin or various types of engineering plastics several times over a conductor is available.
- each layer may be colored differently by, for instance, using a resin having a different color for each insulating layer respectively, to clearly identify each insulating layer.
- a paints-coated layer coated with heat-resistant paints is formed by applying fluorine paints-based dispersion paints, silicon acryl resin, or acryl fluoride-based resin several time. Also in this step, each layer may be colored differently as described above.
- each insulating layer is independent and can be separated from other layers means that each layer can be separated from other layers and exists as one independent layer.
- a means for separating an insulating layer such a method as using a stripper, removing an insulating layer by giving a slit flaw to the insulating layer, removing an insulating layer by burning and cutting the insulating layer with a heated knife, or winding back a wound film, is available.
- a coating for magnet wire is formed by applying insulating varnishes several times around a conductor and baking the varnishes, and each layer can not be separated from other layers, so that sometimes a magnet wire is not recognized as a multi-layered insulating wire.
- the bundled insulated conductor according to this invention is manufactured by bundling a plurality of insulated element wires almost in parallel to each other into one conductor having a round cross section or by twisting a plurality of insulated element wires into a conductor having a round section , and generation of an eddy current can be suppressed to a low level because each element conductor of the insulated element wire is insulated respectively, so that increase of high frequency resistance accompanying an eddy current loss can be prevented. Also in bundled insulated conductor, a surface are of conductor is larger than that of a single wire conductor, increase of a loss due to the skin effect can largely be suppressed.
- a length of twisted conductors can be shortened, and also DC current in a coil can be reduced in proportion to the shortened length of the twist conductors.
- the multi-layered insulated wire is constructed so that insulation resistance (3.75 kV in case of IEC 950) required by the safety standards is provided and maintained by any 2 insulating layers of the at least 3 insulating layers comprising an insulating layer for the insulated element wire and insulating layers on the bundled insulated conductor, so that the multi-layered insulated wire is accepted as an insulated wire for a winding having appropriate insulation characteristics required by the safety standards, and is free from many of the aforesaid restrictions to conventional types of transformer.
- FIG. 1 is a drawing showing a cross section of a multi-layered insulated wire for a winding to be used in a transformer according to the invention.
- FIG. 2 is a drawing showing a cross section of another embodiment of the multi-layered insulated wire for a winding to be used in a transformer according to the invention.
- FIG 1 is a drawing showing a multi-layered insulated wire according to the invention.
- a copper wire 31 having a diameter of 0.12 mm was used as an element wire conductor 31, and an insulated element wire was manufactured by arranging a primary insulating layer 33a with a coating thickness of 0. 04 mm formed by means of applying polytetra fluoroethylene (PTFE) dispersion paints around this copper wire 31.
- PTFE polytetra fluoroethylene
- a 3-layered insulated wire 34 was manufactured by arranging an extruded layer formed by natural color fluorinated ethylene propylene resin (FEP) (Teflon 100 J, product name of Mitsui Dupont Fluoro-Chemical Corp.) with a thickness of about 0.06 mm around this bundled insulated wire 32 as a secondary insulating 23b, and furthermore by arranging an extruded layer formed by extruding blue FEP with a thickness of about 0.06 mm around this secondary insulating layer 23b as a tertiary 23c.
- FEP natural color fluorinated ethylene propylene resin
- FIG. 2 is a drawing showing a cross section of a multi-layered insulated wire which is a modified one according to the this invention.
- a copper wire having a conductor diameter of 0.12 mm was used as an element wire conductor 31, and an insulating element wire was manufactured by arranging a primary insulating layer 43a by means of extruding natural color FEP with a thickness of 0.04 mm. Then, 19 lines of this element insulated wire were bundled almost in parallel to each other into a bundled insulated conductor 32 having a round cross section and also having an outer diameter of 1.00 mm. Then, a 3-layered insulated wire 44 was manufactured by arranging a secondary insulating layer 43b by means of winding a white PPS film (3.5 mm width ⁇ 0.
- a switching transformer in which a 3-layered insulated wire according to the embodiment 1 of this invention was used as a secondary winding and a switching transformer in which 0.038 mm polyurethane coated copper wire with a diameter of 0,60 mm was used as a secondary winding were manufactured, using the completely same parts and components in other sections.
- a switching transformer with an oscillation frequency of 50 kHz using in a switching power source with an output of 136 W these switching transformers were run under the conditions of output voltage of 161 V and output current of 0.5 A, and surface temperature of the winding in each transformer was measured using a thermistor thermometer. The results are shown in Table 2.
- a bundled insulated conductor manufactured by bundling a plurality of insulated conductors almost in parallel to each other into a conductor having a round cross section, or by twisting a plurality of the aforesaid insulated element wires into a conductor having a round cross section is used, so that heat emission due to an eddy current loss or the skin effect in the conductor can largely be suppressed, and because of this effect it is possible to suppress heat emission from a switching transformer even when the switching frequency is high, which contributes to improvement of efficiency of a switching power source.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Of Transformers For General Uses (AREA)
- Insulated Conductors (AREA)
- Insulating Of Coils (AREA)
Description
This device relates to an insulated wire for a winding
suited to be used in a high frequency transformer, a
high frequency reactor, or a high frequency coil used in
such devices such as a switching power source.
Generally a magnet wire manufactured by forming an
insulating layer made of such a material as polyurethane
resin or polyester resin on a single wire conductor has
been used as an insulated wire for a winding for a
switching power source.
A safety transformer for such a device as a switching
power source must follow the following restrictions based
on IEC International Electrotechnical Commission) or UL
(Standards of Underwriter's Laboratories, Inc.,) as well
as on other various types of safety standard;
because of the restrictions required by the safety
standards as described above, when using a magnet wire,
sometimes the user may face many troubles such as
difficulty in minimizing a transformer, requirement for
parts and processes to carry out various types of
processing for insulation, or difficulty in obtaining
acompact and high performance transformer. To solve these
problems, this invention proposed use of a 3-layered
insulated wire for a winding to be used in a
transformer, as described in Japanese Utility
Model Application No. 49802/1990, Japanese Patent
Application laid-open No.4042515/1992, Japanese Utility Model
Application No. 49801/1990, and EP-A-0 258 036 which describes a multi-layered insulated wire according to the preamble of claim 1, and now it is possible to
satisfy the safety standards such as IEC or UL.
In a switching power source, a high frequency in a
range from several tens KHz to several hundreds KHz is
now used for a switching frequency to improve the switching
efficiency.
However, in such a high frequency band area as
described above, an eddy current loss in a conductor of a
transformer winding and a loss due to the skin effect
become very large, which causes heat emission from a
transformer and may degrade characteristics of not only
an insulated electric wire for a winding, but also a
transformer itself.
This invention was made to solve the problems as
described above, and the object is to provide an insulated
electric wire for a winding to be used in a transformer,
which satisfies the various types of requirements for
safety as described above and can contribute to reduction
of heat emission from a transformer even if the switching
frequency is in a high frequency band area.
To achieve the object as described above, this
invention provides a multi-layered insulated wire for a
winding to be used in a high frequency transformer
comprising:
- (i) each of said plurality of conductors has a second
insulating layer comprising:
- a) a wound layer formed by winding heat-resistant plastics film;
- b) an extruded layer formed by extruding heat-resistant material; or
- c) a coated layer formed by applying heat-resistant paints;
The aforesaid bundled insulated conductor
according to this invention may be manufactured by bundling
a plurality of the aforesaid insulated element wires
almost in parallel to each other into a conductor having
a round cross section, or by bundling a plurality of the
aforesaid insulated element wires by twisting said
element wires by means of bundle-twisting, co-axial
twisting, or litz twisting.
In a multi-layered insulated wire for a winding
to be used in a high frequency transformer, generally a
small diameter wire such as a copper wire, a copper-alloy
wire, or a tin- or solder-plated copper wire is used as a
conductor for the element wire. Generally, a size of this
small diameter conductor is in a range from 0. 08 mm (AWG
40) to 0.20 mm (AEG 32).
As an insulating layer for a multi-layered insulating
wire, a layer manufactured by winding a heat-resistant
plastic film such as, for instance,a polyimide film, an
aromatic polyamide film, a polyether ether ketone film, a
polyphenylene sulfide (PPS) film, or a polyester film in
an overlapped relation is used. Also, a heat-sensing
adhesive layer may be arranged on the aforesaid
heat-resistant plastic film, and after said film is
wound around a conductor, heat may be applied to
integrate the heat-sensing adhesive layer with the
heat-resistant film. Furthermore, if it is necessary,
films having different colors may be used for each layer
respectively, or each layer may be colored differently by
employing such a method as adding a specific dyestuff to a
heat-sensing adhesive layer for a film with a
heat-sensing adhesive layer to color each layer
differently, to clearly identify each insulating layer.
As an extruded layer made of a heat-resistant resin, an
extruded layer manufactured by extruding a heat-resistant
resin such as various types of fluorine resin or various
types of engineering plastics several times over a
conductor is available. If necessary, each layer may be
colored differently by, for instance, using a resin
having a different color for each insulating layer
respectively, to clearly identify each insulating layer.
A paints-coated layer coated with heat-resistant
paints is formed by applying fluorine paints-based
dispersion paints, silicon acryl resin, or acryl
fluoride-based resin several time. Also in this step,
each layer may be colored differently as described above.
The requirement that each insulating
layer is independent and can be separated from other
layers means that each layer can be separated from other
layers and exists as one independent layer. As a means
for separating an insulating layer, such a method as
using a stripper, removing an insulating layer by giving
a slit flaw to the insulating layer, removing an
insulating layer by burning and cutting the insulating
layer with a heated knife, or winding back a wound film,
is available. In contrast to it, a coating for magnet
wire is formed by applying insulating varnishes several
times around a conductor and baking the varnishes, and each
layer can not be separated from other layers, so that
sometimes a magnet wire is not recognized as a multi-layered
insulating wire.
The bundled insulated conductor according to this
invention is manufactured by bundling a plurality of
insulated element wires almost in parallel to each other
into one conductor having a round cross section or by
twisting a plurality of insulated element wires into a
conductor having a round section , and generation of an
eddy current can be suppressed to a low level because
each element conductor of the insulated element wire is
insulated respectively, so that increase of high
frequency resistance accompanying an eddy current loss can
be prevented. Also in bundled insulated conductor, a
surface are of conductor is larger than that of a single
wire conductor, increase of a loss due to the skin
effect can largely be suppressed. Also, when a plurality
of the aforesaid insulated element wires are bundled into
a conductor having a round cross section, or when a
plurality of the aforesaid insulated element wires are
twisted into a conductor having a round cross section, a
length of twisted conductors can be shortened, and also
DC current in a coil can be reduced in proportion to the
shortened length of the twist conductors.
Also, the multi-layered insulated wire is constructed
so that insulation resistance (3.75 kV in case of IEC 950)
required by the safety standards is provided and
maintained by any 2 insulating layers of the at least 3
insulating layers comprising an insulating layer for the
insulated element wire and insulating layers on the
bundled insulated conductor, so that the multi-layered
insulated wire is accepted as an insulated wire for a
winding having appropriate insulation characteristics
required by the safety standards, and is free from many
of the aforesaid restrictions to conventional types of
transformer.
FIG. 1 is a drawing showing a cross section of a
multi-layered insulated wire for a winding to be used in
a transformer according to the invention.
FIG. 2 is a drawing showing a cross section of another
embodiment of the multi-layered insulated wire for a
winding to be used in a transformer according to the invention.
Description is made for preferred embodiments of this
invention with accompanying drawings.
FIG 1 is a drawing showing a multi-layered insulated
wire according to the invention.
A copper wire 31 having a diameter of 0.12 mm was
used as an element wire conductor 31, and an insulated
element wire was manufactured by arranging a primary
insulating layer 33a with a coating thickness of 0. 04 mm
formed by means of applying polytetra fluoroethylene (PTFE)
dispersion paints around this copper wire 31. 19 lines
of this insulated element wire were bundled into a bundled
insulated conductor 32 having an outer diameter of 1.00
mm and also having a round cross section by giving a
twisting pitch of 30 mm to the bundled conductor. Then, a
3-layered insulated wire 34 was manufactured by arranging
an extruded layer formed by natural color fluorinated
ethylene propylene resin (FEP) (Teflon 100 J, product
name of Mitsui Dupont Fluoro-Chemical Corp.) with a
thickness of about 0.06 mm around this bundled insulated
wire 32 as a secondary insulating 23b, and furthermore by
arranging an extruded layer formed by extruding blue FEP
with a thickness of about 0.06 mm around this secondary
insulating layer 23b as a tertiary 23c. Each layer of the
insulating layer 33 of this 3-layered insulated wire 34
could be separated from other ones by a giving a slit
flaw on a surface of the coating or by using a stripper.
FIG. 2 is a drawing showing a cross section of a
multi-layered insulated wire which is a modified one
according to the this invention.
A copper wire having a conductor diameter of 0.12 mm was
used as an element wire conductor 31, and an insulating
element wire was manufactured by arranging a primary
insulating layer 43a by means of extruding natural color
FEP with a thickness of 0.04 mm. Then, 19 lines of this
element insulated wire were bundled almost in parallel to
each other into a bundled insulated conductor 32 having a
round cross section and also having an outer diameter of
1.00 mm. Then, a 3-layered insulated wire 44 was
manufactured by arranging a secondary insulating layer 43b
by means of winding a white PPS film (3.5 mm width × 0. 03 mm
thickness ) with 1/2 laps around this bundled insulated
conductor 42, and furthermore by arranging a tertiary
insulating layer 43c by means of winding a white PPS film
(3.5 mm width × 0.03 thickness) with 1/2 laps around the
secondary insulating layer 42. The primary insulating
layer 43a could be separated by a stripper, while the
secondary insulating layer 43b and the tertiary
insulating layer 43c of the insulating layer 43 in this
3-layered insulated wire 44 could be separated by winding
back each film respectively.
Results of withstand voltage tests for the
multi-layered insulated wires in embodiment 1 and
embodiment 2 carried out to identify a relation between
an outer diameter of a wire and the voltage resistance
characteristics using samples having layers as described
above are shown in Table 1, and any difference between
embodiment 1 and embodiment 2 was not observed.
| Sample | Outer diameter (mm) | Breaking test (AC,KV) (1) |
| Sample with up to primary insulating layer | 1.00 | 2.0 |
| Sample with up to secondary insulating layer | 1.12 | 5.9 |
| Sample with up to tertiary insulating layer | 1.24 | 9.0 |
| Note (1) indicates a result of breakdown voltage measured by winding each wire around a mandrel with a diameter of 10 mm (with 15 turns). As clearly shown in Table 1, the insulated wire having the construction as described above could satisfy the voltage resistance characteristics required by IEC 950, namely 3.75 KV for 1 minute. |
A switching transformer in which a 3-layered
insulated wire according to the embodiment 1 of this
invention was used as a secondary winding and a switching
transformer in which 0.038 mm polyurethane coated copper
wire with a diameter of 0,60 mm was used as a secondary
winding were manufactured, using the completely same parts
and components in other sections. To test a switching
transformer with an oscillation frequency of 50 kHz using
in a switching power source with an output of 136 W,
these switching transformers were run under the
conditions of output voltage of 161 V and output
current of 0.5 A, and surface temperature of the winding
in each transformer was measured using a thermistor
thermometer. The results are shown in Table 2.
As clearly shown in Table 2, in the switching
transformer in which the multi-layered insulating
according to this invention was used, temperature was lower
by 6.3 °C than that in the transformer in which a
conventional type of single copper wire was used.
| Secondary winding material | Surface of transformer winding (°C) | Room (°C) | Temp. difference ΔT (°C) |
| Wire in embodiment 3-1 | 68. 9 | 26.3 | 42.6 |
| Polyurethane copper wire | 75.2 | 26.3 | 48.9 |
In the multi-layered insulated wire, a bundled
insulated conductor manufactured by bundling a plurality
of insulated conductors almost in parallel to each other
into a conductor having a round cross section, or by
twisting a plurality of the aforesaid insulated element
wires into a conductor having a round cross section is
used, so that heat emission due to an eddy current loss
or the skin effect in the conductor can largely be
suppressed, and because of this effect it is possible to
suppress heat emission from a switching transformer even
when the switching frequency is high, which contributes to
improvement of efficiency of a switching power source.
Claims (4)
- A multi-layered insulated wire (34,44) for a winding to be used in a high frequency transformer comprising:and characterized in that:(i) at least two first insulating layers (23b, 23c; 43b, 43c) around a conductor, which is a bundled conductor manufactured by bundling a plurality of conductors (31) ;(ii) each of said at least two first insulating layers (23b, 23c; 43b, 43c) comprising:a) a wound layer formed by winding heat-resistant plastics film; orb) an extruded layer formed by extruding heat-resistant material; orc) a coated layer formed by applying heat-resistant paints;(i) each of said plurality of conductors (31) has a second insulating layer (33a; 43a) comprising:a) a wound layer formed by winding heat-resistant plastics film; orb) an extruded layer formed by extruding heat-resistant material; orc) a coated layer formed by applying heat-resistant paints;(ii) any two of said at least two first insulating layers (23b, 23c; 43b, 43c) and said second insulating layer (33a; 43a) provide an insulating resistance of 3.75kV for one minute; and(iv) each of said at least two first insulating layers and said second insulating layer is mutually independent and separable from the other layers.
- The multi-layered insulated electric wire according to claim 1, wherein the aforesaid bundled conductor is manufactured by bundling said plurality of conductors (31) almost in parallel to each other into a conductor having a round cross section.
- A multi-layered insulated electric wire according to claim 1, wherein the bundled conductor is manufactured by twisting and bundling said plurality of the conductors (31) into a conductor having a round cross section.
- A multi-layered insulated electric wire according to claim 1, claim 2 or claim 3 in which the plurality of ccnductors (31) are copper wires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1992627599 DE69227599T2 (en) | 1992-08-19 | 1992-08-19 | Multi-layer insulated wire for high frequency transformer winding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP92307575A EP0583521B2 (en) | 1992-08-12 | 1992-08-19 | Multi-layered insulated wire for high frequency transformer winding |
Related Parent Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92307575.8 Division | 1992-08-19 | ||
| EP92307575A Division EP0583521B2 (en) | 1992-08-12 | 1992-08-19 | Multi-layered insulated wire for high frequency transformer winding |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0684617A2 EP0684617A2 (en) | 1995-11-29 |
| EP0684617A3 EP0684617A3 (en) | 1996-09-25 |
| EP0684617B1 true EP0684617B1 (en) | 1998-11-11 |
Family
ID=8211469
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95113100A Expired - Lifetime EP0684617B1 (en) | 1992-08-19 | 1992-08-19 | Multi-layered insulated wire for high frequency transformer winding |
| EP95108611A Expired - Lifetime EP0673044B1 (en) | 1992-08-19 | 1992-08-19 | Multi-layered insulated wire for high frequency transformer winding |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95108611A Expired - Lifetime EP0673044B1 (en) | 1992-08-19 | 1992-08-19 | Multi-layered insulated wire for high frequency transformer winding |
Country Status (2)
| Country | Link |
|---|---|
| EP (2) | EP0684617B1 (en) |
| DE (1) | DE69210398T3 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IL136301A (en) | 2000-05-22 | 2005-09-25 | Payton Planar Magnetics Ltd | Method of insulating a planar transformer printed circuit and lead frame windings forms |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL6903660A (en) * | 1968-03-26 | 1969-09-30 | ||
| JPS6358709A (en) * | 1986-08-28 | 1988-03-14 | カ−リスル コ−ポレ−シヨン | Conductor insulated with multi-layer high temperature resistant insulating body |
| JPH0249801U (en) | 1988-09-29 | 1990-04-06 | ||
| JPH0249802U (en) | 1988-10-04 | 1990-04-06 | ||
| JP2557965B2 (en) | 1988-12-01 | 1996-11-27 | 日本電信電話株式会社 | Image coding method |
| JPH0325219U (en) * | 1989-03-01 | 1991-03-15 | ||
| JP2593101B2 (en) * | 1990-06-08 | 1997-03-26 | サンケン電気株式会社 | Coil device |
-
1992
- 1992-08-19 EP EP95113100A patent/EP0684617B1/en not_active Expired - Lifetime
- 1992-08-19 DE DE1992610398 patent/DE69210398T3/en not_active Expired - Fee Related
- 1992-08-19 EP EP95108611A patent/EP0673044B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0684617A2 (en) | 1995-11-29 |
| EP0673044A3 (en) | 1995-10-18 |
| DE69210398D1 (en) | 1996-06-05 |
| DE69210398T3 (en) | 2003-06-05 |
| EP0673044B1 (en) | 1997-01-22 |
| EP0673044A2 (en) | 1995-09-20 |
| EP0684617A3 (en) | 1996-09-25 |
| DE69210398T2 (en) | 1996-10-24 |
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