GB1243495A - Electro-static shielding of toroidal transformers - Google Patents

Electro-static shielding of toroidal transformers

Info

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
Application number
GB03053/70A
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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
Priority to FR6940071A priority Critical patent/FR2067180A1/en
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Priority to GB03053/70A priority patent/GB1243495A/en
Publication of GB1243495A publication Critical patent/GB1243495A/en
Expired 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
    • H01F27/28—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.
GB03053/70A 1969-11-21 1970-03-18 Electro-static shielding of toroidal transformers Expired GB1243495A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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