GB2361111B - Common-mode electromagnetic filters for cables - Google Patents

Common-mode electromagnetic filters for cables

Info

Publication number
GB2361111B
GB2361111B GB0008218A GB0008218A GB2361111B GB 2361111 B GB2361111 B GB 2361111B GB 0008218 A GB0008218 A GB 0008218A GB 0008218 A GB0008218 A GB 0008218A GB 2361111 B GB2361111 B GB 2361111B
Authority
GB
United Kingdom
Prior art keywords
cable
signals
conductive element
cables
impedance
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 - Fee Related
Application number
GB0008218A
Other versions
GB2361111A (en
GB0008218D0 (en
Inventor
Richard Carlile Marshall
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
Priority to GB0008218A priority Critical patent/GB2361111B/en
Publication of GB0008218D0 publication Critical patent/GB0008218D0/en
Publication of GB2361111A publication Critical patent/GB2361111A/en
Application granted granted Critical
Publication of GB2361111B publication Critical patent/GB2361111B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
    • H03H1/0007—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network of radio frequency interference filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/42—Balance/unbalance networks
    • H03H7/425—Balance-balance networks
    • H03H7/427—Common-mode filters
    • 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
    • H01F2017/065—Core mounted around conductor to absorb noise, e.g. EMI filter

Abstract

A filter suitable for application to an electric cable 1 comprises at least one magnetic material element 3 arranged to magnetically couple with signals travelling in the cable 1 such that it induces a series impedance to said signals and at least one electrically conductive element 4 arranged to electrostatically couple with signals in the cable 1 such that an impedance is formed between the signals and earth. The conductive element 4 may be a tape, mesh or conductively coated fabric wound round a split clamp-on ferrite core 3. Alternatively the conductive element may be separate from the magnetic element and pressed into close proximity with the cable 1 by spring means, plastic foam and /or clamped by a metal trough and lid arrangement. The magnetic element 3 may include a winding linked to an electrical impedance arrangement. The filter provides a wide-band radio-frequency attenuation in cables without cutting or gaining access to the cable ends.
GB0008218A 2000-04-05 2000-04-05 Common-mode electromagnetic filters for cables Expired - Fee Related GB2361111B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0008218A GB2361111B (en) 2000-04-05 2000-04-05 Common-mode electromagnetic filters for cables

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0008218A GB2361111B (en) 2000-04-05 2000-04-05 Common-mode electromagnetic filters for cables

Publications (3)

Publication Number Publication Date
GB0008218D0 GB0008218D0 (en) 2000-05-24
GB2361111A GB2361111A (en) 2001-10-10
GB2361111B true GB2361111B (en) 2004-01-07

Family

ID=9889139

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0008218A Expired - Fee Related GB2361111B (en) 2000-04-05 2000-04-05 Common-mode electromagnetic filters for cables

Country Status (1)

Country Link
GB (1) GB2361111B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103443880A (en) * 2011-03-09 2013-12-11 丰田自动车株式会社 Noise reduction device and bus bar module

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2409110A (en) * 2003-11-21 2005-06-15 Richard Carlile Marshall Common mode absorbing device for cables

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2574213A1 (en) * 1984-12-05 1986-06-06 Merlin Gerin Anti-interference device for electronic equipment
WO1991017556A1 (en) * 1990-05-04 1991-11-14 Fmtt, Inc. Magnetic core structures for matrix transformers and matrix inductors
GB2252876A (en) * 1991-01-24 1992-08-19 Mitsubishi Electric Corp A signal discriminator
EP0687038A2 (en) * 1994-06-06 1995-12-13 Digital Equipment Corporation Common-mode filtering attachment for power line connectors
JPH11112185A (en) * 1997-10-01 1999-04-23 Tokin Corp Fixing method of noise absorption core
US5902957A (en) * 1996-05-28 1999-05-11 Uro Denshi Kogyo Kabushiki Kaisha Line radiation preventing element

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2574213A1 (en) * 1984-12-05 1986-06-06 Merlin Gerin Anti-interference device for electronic equipment
WO1991017556A1 (en) * 1990-05-04 1991-11-14 Fmtt, Inc. Magnetic core structures for matrix transformers and matrix inductors
GB2252876A (en) * 1991-01-24 1992-08-19 Mitsubishi Electric Corp A signal discriminator
EP0687038A2 (en) * 1994-06-06 1995-12-13 Digital Equipment Corporation Common-mode filtering attachment for power line connectors
US5902957A (en) * 1996-05-28 1999-05-11 Uro Denshi Kogyo Kabushiki Kaisha Line radiation preventing element
JPH11112185A (en) * 1997-10-01 1999-04-23 Tokin Corp Fixing method of noise absorption core

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103443880A (en) * 2011-03-09 2013-12-11 丰田自动车株式会社 Noise reduction device and bus bar module

Also Published As

Publication number Publication date
GB2361111A (en) 2001-10-10
GB0008218D0 (en) 2000-05-24

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20060405