GB1243495A - Electro-static shielding of toroidal transformers - Google Patents
Electro-static shielding of toroidal transformersInfo
- Publication number
- GB1243495A GB1243495A GB03053/70A GB1305370A GB1243495A GB 1243495 A GB1243495 A GB 1243495A GB 03053/70 A GB03053/70 A GB 03053/70A GB 1305370 A GB1305370 A GB 1305370A GB 1243495 A GB1243495 A GB 1243495A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electroless
- coating
- conductive material
- winding
- insulated
- 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
Links
- 238000004804 winding Methods 0.000 abstract 4
- 239000011248 coating agent Substances 0.000 abstract 3
- 238000000576 coating method Methods 0.000 abstract 3
- 239000004020 conductor Substances 0.000 abstract 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract 2
- 229910052802 copper Inorganic materials 0.000 abstract 2
- 239000010949 copper Substances 0.000 abstract 2
- 238000009713 electroplating Methods 0.000 abstract 2
- 238000007747 plating Methods 0.000 abstract 2
- 239000003984 copper intrauterine device Substances 0.000 abstract 1
- 238000001035 drying Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 238000007772 electroless plating Methods 0.000 abstract 1
- 229920006334 epoxy coating Polymers 0.000 abstract 1
- 238000009413 insulation Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 229910000859 α-Fe Inorganic materials 0.000 abstract 1
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
- H01F27/327—Encapsulating or impregnating
-
- 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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
- H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
- H01F17/06—Fixed inductances of the signal type with magnetic core with core substantially closed in itself, e.g. toroid
- H01F17/062—Toroidal core with turns of coil around it
-
- 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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/005—Impregnating or encapsulating
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Regulation Of General Use Transformers (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
1,243,495. Transformers. INTERNATIONAL STANDARD ELECTRIC CORP. 18 March, 1970, No. 13053/70. Heading H1T. A method for electro-static shielding of miniature transformers comprises placing an inner winding (2, Fig. 1B, not shown) on a toroidal ferrite core, coating the winding and core with an insulation, electroless coating the insulated structure with a conductive material, scribing a gap 6 in the conductive material, electroplating the scribed structure with copper 7, insulating, 9, the electroplated structure, and forming an outer winding 10 on said insulated and plated structure. A final insulating and protective epoxy coating (12, Fig. 1H, not shown) is placed over said outer winding and thereafter cured. The electroplating step includes the step of securing a grounding tab 8 to the copper plating. The electroless coating material may be an electroless copper plating on which, after drying, is scribed the gap which prevents a shorted arm effect in the transformer. The insulated structure may be coated with a conductive material by means other than electroless plating means.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR6940071A FR2067180A1 (en) | 1969-11-21 | 1969-11-21 | Electro static shielding of toroidal transformers |
| GB03053/70A GB1243495A (en) | 1969-11-21 | 1970-03-18 | Electro-static shielding of toroidal transformers |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR6940071A FR2067180A1 (en) | 1969-11-21 | 1969-11-21 | Electro static shielding of toroidal transformers |
| GB03053/70A GB1243495A (en) | 1969-11-21 | 1970-03-18 | Electro-static shielding of toroidal transformers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1243495A true GB1243495A (en) | 1971-08-18 |
Family
ID=57046890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB03053/70A Expired GB1243495A (en) | 1969-11-21 | 1970-03-18 | Electro-static shielding of toroidal transformers |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR2067180A1 (en) |
| GB (1) | GB1243495A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0747913A1 (en) * | 1995-06-05 | 1996-12-11 | Motorola, Inc. | Surface mount electronic component with a grooved core and a method for making |
| EP2105937A1 (en) * | 2008-03-28 | 2009-09-30 | Sercomm Corporation | Transformer apparatus with shielding architecture and shielding method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3311391B2 (en) | 1991-09-13 | 2002-08-05 | ヴィエルティー コーポレーション | Leakage inductance reducing transformer, high frequency circuit and power converter using the same, and method of reducing leakage inductance in transformer |
-
1969
- 1969-11-21 FR FR6940071A patent/FR2067180A1/en not_active Withdrawn
-
1970
- 1970-03-18 GB GB03053/70A patent/GB1243495A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0747913A1 (en) * | 1995-06-05 | 1996-12-11 | Motorola, Inc. | Surface mount electronic component with a grooved core and a method for making |
| EP2105937A1 (en) * | 2008-03-28 | 2009-09-30 | Sercomm Corporation | Transformer apparatus with shielding architecture and shielding method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2067180A1 (en) | 1971-08-20 |
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