US3781740A - Radio interference elimination choke for suppressing impulse like interference voltages - Google Patents

Radio interference elimination choke for suppressing impulse like interference voltages Download PDF

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Publication number
US3781740A
US3781740A US00201754A US3781740DA US3781740A US 3781740 A US3781740 A US 3781740A US 00201754 A US00201754 A US 00201754A US 3781740D A US3781740D A US 3781740DA US 3781740 A US3781740 A US 3781740A
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US
United States
Prior art keywords
core
partial
radio interference
interference elimination
mole
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Expired - Lifetime
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US00201754A
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English (en)
Inventor
P Kirmis
H Wagner
H Kaiserswerth
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Siemens AG
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Siemens AG
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Publication of US3781740A publication Critical patent/US3781740A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
    • 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
    • H01F27/24—Magnetic cores
    • H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
    • 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
    • H01F27/24—Magnetic cores
    • H01F27/255—Magnetic cores made from particles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F37/00—Fixed inductances not covered by group H01F17/00

Definitions

  • ABSTRACT A radio interference elimination choke employs a [52] us. Cl 336/96, 336/189, 336/212, g i imp n r h ing at least two annular 335/229 336/233 axially superposed partial cores housed in an insulat- 51 1111.01.
  • the primary object of the present invention is to create a low-cost choke component for the attenuation of impulse-like interferences as they occur, for example, in firing angle control circuits with thyristors.
  • VDE Association of German Engineers
  • a radio frequency interference elimination choke having a magnetic impedance core of at least two annular axially superposed partial cores and which is characterized in that for attenuation of impulse-like interference voltages and of transients in the low frequency range, at least one of the partial cores exhibits high losses in the frequency range of the transients.
  • Magnetic materials having high losses in the low frequency range precisely attenuate the undesirable transients of the interference suppression circuit which are stimulated, for example, by the operation of a firing angle control circuit, and which reduce the momentary value of the charge current below the hold current of an associated thyristor, thus being able to render the thyristor non-conductive.
  • the magnetic materials offer the advantage of a marked savings in cost with respect to the high cost of materials heretofore employed.
  • the annular core shape offers, over all other core shapes, i.e., elliptical, U or E-shape, with small air gaps, the advantages obtained by a particularly favorable ratio of core losses to core volume.
  • a choke device was developed to attenuate transients in the frequency range of5 to 15 kHz, whereby a partial core is composed of iron sheet metal containing Si.
  • a partial core is composed of iron sheet metal containing Si.
  • at least one additional partial core is designed as a ferrite core with a permeability of at least 200, whereby the impedance core exhibits high losses due to the effect of the ferrite material in the frequency range from 10 to 300 MHz with a permeability which decreases with increasing frequency.
  • This core structure represents a combination of two attenuation principles: On the one hand, conversion of oscillating energy into heat by high losses in particularly critical frequency ranges; and on the other hand, attenuation of high frequency interferences by a relatively high inductive resistance in the high frequency range. Therefore, a uniform radio interference suppression can be accomplished in the entire desired rangeat a minimum cost and at a minimum space requirement.
  • Such an impedance core comprises a first partial core which consists of rings of a coldrolled iron sheet containing 2.9 to 3.1%, preferably 3.0% silicon, and a second partial core which consists of a ferrite composed of 47.55 mole Fe,o,,, 3l.6 mole ZnO, 20.6 mole NiO and 0.25 mole C00, which may be produced according to well known con- 'ventional methods, and wherein the first partial core accounts for 65 to percent, preferably 67 percent, of the effective cross-section of the impedance core.
  • Another such core comprises a first partial core which consists of rings of hot-rolled iron sheet containing 4.3 to 4.5% silicon, and a second partial core which consists of a ferrite material composed of 47.55 mole Fe O 31.6 mole ZnO, 20.6 mole MO, and 0.25 mole C00, and wherein the first partial core accounts for 65 to 85 percent, preferably 67 percent, of the cross-section of the impedance core.
  • an efficient dimensioning of the impedance core includes the outer diameter of the ferrite ring core and the outer diameter of the rings of the iron sheet containing silicon is 34mm, the inner diameter of the ferrite ring core and the inner diameter of the rings of the iron sheet containing silicon is 20mm, the height ofthe ferrite ring core is 3mm and the sheet thickness of the rings of the iron sheet containing silicon is 0.35mm.
  • a radio interference elimination choke comprising a winding of two layers, at the most, applied to a cup having the impedance core therein, wherein at the beginning of the second layer, the direction of the winding, but not the sense of the winding, is reversed.
  • This type of winding advantageously reduces the influence of the inherent capacity of the coil so that inherent resonances are avoided in the frequency range to be attenuated (KW-range), which resonances otherwise occur in the conventional overwinding of the start of the coil.
  • the appliances which may utilize interference elimination are used, among other places, in residences and- 3 lo'r offices where as silent as' possible' an operation of the arrangementis desired.
  • Noise attenuation of the impedance core is accomplished by .pouringout in an insulating, cup a pourable resin which remains elastic, and which comprises, for better heat conductivity, about 40 percent quartz meal.
  • the addition of quartz meal to the pouring resin also offers the advantage of a considerable reduction in cost.
  • the annular cup it is advantageous for the annular cup to include lamella-like elevations which project from its inner wallsso that the impedance core does not adhere beyond these projections to the side wall of the cup.
  • FIG. 2 is'an electrical's'chematic diagram partic ularly showing the winding of thechoke of FIG. 1.
  • an impedance core 1 is illustrated as comprising a partial core 2 which includes 17 rings of a cold-rolled iron sheet containing about 3% silicon, and having a sheet thickness of gauge of about 0.35mm, and a partial core 3 of ferrite mate rial composed of 47.55 mole Fe O 31.6.mole
  • the partial core'3 is 3mm in height so that its effective cross-section accounts for one-third of the effective cross-section of the impedance core 1 and the partial core 2 of iron sheet containing silicon accounts for two-thirds of the effective cross-section of the impe-- dance core 1.
  • the impedance core 1 is placed in a cup 4 which is closed with a cover 7 and adheres or abuts to elevations 5 on the bottom of the cup which are integrally connected to the lamellae 11 at the side walls of the cup 4.
  • an aisle or passageway remains between the elevations 5 for passing a poured resin therethrough which remains elastic after hardening.
  • a radio interference elimination choke for phase control switching circuits comprising a'magnetic impedance core of two annular axially superposed partial cores, a cup and a cup cover housing said cores, at least one coil carried about said-cup and cupvcover, a first .of said partial cores including iron sheet material containing 2 to 4% Si having high electric losses in the frequency range of 5 to 15 kHz for attenuating transients which are due to impulse-like currents applied to said coil, said first partial core having across section accounting for to percent of the effective cross section of the impedance core, a second of said partial cores including ferrite material having a permeability of at least 200 in the frequency range up tolO MHz, said impedance core exhibiting high-losses due to the effect of the ferrite material in the frequency range of from 10 to 300 MHz with a permeability which decreases with increasing frequency.
  • a radio interference elimination choke according to claim 1, wherein said first partial core comprises rings of a cold-rolled iron sheet containing 2.9 to 3.1% silicon, and said second partial core is composed of 47.55 mole Fe O 3l.6'mole -ZnO ,20.6 mole N.i0 and 0.25 mole C00, I
  • a radio interference elimination choke according to claim 1, wherein said first partial core comprises rings of a hot-rolled iron sheet containing 4.3 to. 5.5% silicon, and said second partial core is composed of 47.55 mole Fe O 31.6 mole %'ZnO, 20.6 mole MO and 0.25 mole C00. 1
  • a radio interference elimination choke according to claim 1, wherein said partial cores are rings having an outside diameter of 3.4 mm and an inside diameter of 20 mm, said first partial core comprising a plurality of rings having a thickness of 0.35 mm and said second partial core having a height of 3 mm.
  • a radio interference elimination choke according to claim 1, wherein said first partial core accounts for 67 percent of the effective cross section of the impedance core.
  • a radio interference eliminationchoke according to claim 1, wherein said coil comprises superposed windings having a first winding direction and a second winding direction opposite in direction, but not sense, with respect to the first winding direction.
  • a radio interference elimination choke comprising an elastic resin disposed between said cup and said impedance core, said resin including about 40% quartz meal for improving the heat conductivity of said impedance core.
  • a radio interference elimination choke according to claim 8, wherein said cup includes inwardly directed 6 lamella-like projections extending from its inner walls bottom of said cup which define a passageway for the to space said impedance core from said inner walls. flow of resin through said cup, said impedance core 10.
  • a radio interference elimination choke according carried on said projections. to claim 9, comprising projections extending from the

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Soft Magnetic Materials (AREA)
US00201754A 1970-11-27 1971-11-24 Radio interference elimination choke for suppressing impulse like interference voltages Expired - Lifetime US3781740A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2058509A DE2058509C3 (de) 1970-11-27 1970-11-27 Funkentstördrossel gegen impulsartige Störspannungen

Publications (1)

Publication Number Publication Date
US3781740A true US3781740A (en) 1973-12-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00201754A Expired - Lifetime US3781740A (en) 1970-11-27 1971-11-24 Radio interference elimination choke for suppressing impulse like interference voltages

Country Status (12)

Country Link
US (1) US3781740A (de)
AT (1) AT314690B (de)
AU (1) AU3617271A (de)
BE (1) BE775903A (de)
CH (1) CH536546A (de)
DE (1) DE2058509C3 (de)
FR (1) FR2115417B1 (de)
GB (1) GB1367298A (de)
IT (1) IT941775B (de)
NL (1) NL7114511A (de)
NO (1) NO133086C (de)
SE (1) SE373975B (de)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3867657A (en) * 1974-03-29 1975-02-18 Westinghouse Electric Corp Generator having shielded current transformers positioned therein
US4183079A (en) * 1977-07-05 1980-01-08 Sony Corporaton DC-AC inverter
US4325096A (en) * 1978-12-29 1982-04-13 Mitsubishi Denki Kabushiki Kaisha Zero-phase current transformer
US4600911A (en) * 1984-03-20 1986-07-15 Pauwels-Trafo Belgium N.V. Elliptically shaped magnetic core
US4707619A (en) * 1985-02-13 1987-11-17 Maxwell Laboratories, Inc. Saturable inductor switch and pulse compression power supply employing the switch
US4728919A (en) * 1985-11-25 1988-03-01 Siemens Aktiengesellschaft Moisture-tight wound ferrite toroidal core with resin envelope
US4847568A (en) * 1986-06-02 1989-07-11 National Research Development Corporation Microwave apparatus
EP0794539A1 (de) * 1996-03-07 1997-09-10 Vacuumschmelze GmbH Ringdrossel zur Funkenstörung von Halbleiterschaltungen nach dem Phasenanschnittverfahren
US5751207A (en) * 1996-03-07 1998-05-12 Vacuumschmelze Gmbh Annular core for a choke, in particular for radio interference suppression of semiconductor circuits by the phase control method
US5838215A (en) * 1996-02-05 1998-11-17 Motorola, Inc. RF choke with a low Q core formed by sintering ferrous and ferric oxides
US6094109A (en) * 1995-03-06 2000-07-25 Adc Telecommunications, Inc. Power takeoff inductor
US6371265B1 (en) * 1998-06-29 2002-04-16 Alstom Electric railway vehicle and an electric powering unit in particular for such a vehicle
US20060125586A1 (en) * 2004-12-15 2006-06-15 Delta Electronics, Inc. Choke coil and embedded core thereof
US20070035935A1 (en) * 2003-07-08 2007-02-15 Siemens Ag Circuit arrangement for emc interference suppression for a direct current motor and a swwitching module
US20070115087A1 (en) * 2005-11-23 2007-05-24 Delta Electronics Inc. Inductor and fabricating method thereof
EP1895550A1 (de) * 2006-08-30 2008-03-05 Abb Research Ltd. Anordnung zum Unterdrücken von Hochfrequenzstromkomponenten und/oder Hochfrequenzspannungskomponenten
US7724118B1 (en) * 2008-12-05 2010-05-25 Taimag Corporation Pulse transformer with a choke part
US20110163834A1 (en) * 2010-01-05 2011-07-07 Stahmann Jeffrey E Apparatus and method for reducing inductor saturation in magnetic fields

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7221902U (de) 1972-06-12 1972-11-16 Siemens Ag Ferromagnetischer kern fuer elektrische drosselspulen
DE2343377B2 (de) * 1973-08-28 1977-07-07 Siemens AG, 1000 Berlin und 8000 München Funkentstoerdrossel
DE2505080C3 (de) * 1975-02-07 1989-04-06 Hartmann, Götz-Udo, 6391 Grävenwiesbach Funkentstördrossel und Verfahren zu ihrer Herstellung
DE2721967A1 (de) * 1977-05-14 1978-11-16 Vogt Gmbh & Co Kg Funkenstoerdrosseln fuer phasenanschnittgesteuerte halbleiterschaltungen
DE2736963C3 (de) * 1977-08-17 1982-09-09 Hartmann, Götz-Udo, 6391 Grävenwiesbach Funkentstördrossel und Verfahren zu ihrer Herstellung
DE3324078A1 (de) * 1983-07-04 1985-01-17 Götz-Udo 6391 Grävenwiesbach Hartmann Isolierstoffgehaeuse
DE3621573C2 (de) * 1986-06-27 1994-12-08 Siemens Ag Stromkompensierte Funkentstördrossel
AT409703B (de) 1996-12-13 2002-10-25 Haas Franz Waffelmasch Verfahren und vorrichtungen zum herstellen von essbaren waffelröllchen
DE102004051129A1 (de) * 2004-10-18 2006-04-20 Siemens Ag Drossel, insbesondere zum Betrieb in einem Frequenzumrichtersystem, sowie Frequenzumrichtersystem

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE28423C (de) * A. KRÜZNER in Wien Vorrichtung zum Signalisiren des Aufschneidens von Weichen
US1748857A (en) * 1927-09-06 1930-02-25 Gen Electric Electric transformer
US1897604A (en) * 1930-09-23 1933-02-14 Western Electric Co Electromagnetic device
US1910253A (en) * 1928-11-30 1933-05-23 Siemens Ag Current transformer
US1935885A (en) * 1930-01-15 1933-11-21 Telefunken Gmbh Electrical apparatus
US2843683A (en) * 1956-10-26 1958-07-15 Sarkes Tarzian Television tuner input circuit
US2975386A (en) * 1955-10-11 1961-03-14 Carl E Coy Toroidal electromagnetic device
US2988715A (en) * 1958-09-02 1961-06-13 Zenith Radio Corp Sweep transformer
US3423710A (en) * 1966-09-29 1969-01-21 Atomic Energy Commission Wide band inductive coil device
DE1804835A1 (de) * 1968-10-24 1970-08-20 Vacuumschmelze Gmbh Funkentstoerdrossel

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE28423C (de) * A. KRÜZNER in Wien Vorrichtung zum Signalisiren des Aufschneidens von Weichen
US1748857A (en) * 1927-09-06 1930-02-25 Gen Electric Electric transformer
US1910253A (en) * 1928-11-30 1933-05-23 Siemens Ag Current transformer
US1935885A (en) * 1930-01-15 1933-11-21 Telefunken Gmbh Electrical apparatus
US1897604A (en) * 1930-09-23 1933-02-14 Western Electric Co Electromagnetic device
US2975386A (en) * 1955-10-11 1961-03-14 Carl E Coy Toroidal electromagnetic device
US2843683A (en) * 1956-10-26 1958-07-15 Sarkes Tarzian Television tuner input circuit
US2988715A (en) * 1958-09-02 1961-06-13 Zenith Radio Corp Sweep transformer
US3423710A (en) * 1966-09-29 1969-01-21 Atomic Energy Commission Wide band inductive coil device
DE1804835A1 (de) * 1968-10-24 1970-08-20 Vacuumschmelze Gmbh Funkentstoerdrossel

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3867657A (en) * 1974-03-29 1975-02-18 Westinghouse Electric Corp Generator having shielded current transformers positioned therein
US4183079A (en) * 1977-07-05 1980-01-08 Sony Corporaton DC-AC inverter
US4325096A (en) * 1978-12-29 1982-04-13 Mitsubishi Denki Kabushiki Kaisha Zero-phase current transformer
US4600911A (en) * 1984-03-20 1986-07-15 Pauwels-Trafo Belgium N.V. Elliptically shaped magnetic core
US4707619A (en) * 1985-02-13 1987-11-17 Maxwell Laboratories, Inc. Saturable inductor switch and pulse compression power supply employing the switch
US4728919A (en) * 1985-11-25 1988-03-01 Siemens Aktiengesellschaft Moisture-tight wound ferrite toroidal core with resin envelope
US4847568A (en) * 1986-06-02 1989-07-11 National Research Development Corporation Microwave apparatus
US6094109A (en) * 1995-03-06 2000-07-25 Adc Telecommunications, Inc. Power takeoff inductor
US5838215A (en) * 1996-02-05 1998-11-17 Motorola, Inc. RF choke with a low Q core formed by sintering ferrous and ferric oxides
EP0794539A1 (de) * 1996-03-07 1997-09-10 Vacuumschmelze GmbH Ringdrossel zur Funkenstörung von Halbleiterschaltungen nach dem Phasenanschnittverfahren
US5751207A (en) * 1996-03-07 1998-05-12 Vacuumschmelze Gmbh Annular core for a choke, in particular for radio interference suppression of semiconductor circuits by the phase control method
US6371265B1 (en) * 1998-06-29 2002-04-16 Alstom Electric railway vehicle and an electric powering unit in particular for such a vehicle
US7391137B2 (en) * 2003-07-08 2008-06-24 Siemens Aktiengesellschaft Circuit arrangement for EMC interference suppression for a direct current motor and a switching module
US20070035935A1 (en) * 2003-07-08 2007-02-15 Siemens Ag Circuit arrangement for emc interference suppression for a direct current motor and a swwitching module
US20060125586A1 (en) * 2004-12-15 2006-06-15 Delta Electronics, Inc. Choke coil and embedded core thereof
CN100458988C (zh) * 2004-12-15 2009-02-04 台达电子工业股份有限公司 扼流线圈及其内埋型铁芯
US20070115087A1 (en) * 2005-11-23 2007-05-24 Delta Electronics Inc. Inductor and fabricating method thereof
US7443274B2 (en) * 2005-11-23 2008-10-28 Delta Electronics, Inc. Inductor and fabricating method thereof
EP1895550A1 (de) * 2006-08-30 2008-03-05 Abb Research Ltd. Anordnung zum Unterdrücken von Hochfrequenzstromkomponenten und/oder Hochfrequenzspannungskomponenten
WO2008025424A1 (en) * 2006-08-30 2008-03-06 Abb Research Ltd A device for suppressing high frequency current or/and voltage components
US7724118B1 (en) * 2008-12-05 2010-05-25 Taimag Corporation Pulse transformer with a choke part
US20100141372A1 (en) * 2008-12-05 2010-06-10 Taimag Corporation Pulse transformer with a choke part
US20110163834A1 (en) * 2010-01-05 2011-07-07 Stahmann Jeffrey E Apparatus and method for reducing inductor saturation in magnetic fields
US8390418B2 (en) * 2010-01-05 2013-03-05 Cardiac Pacemakers, Inc. Apparatus and method for reducing inductor saturation in magnetic fields
US8653930B2 (en) 2010-01-05 2014-02-18 Cardiac Pacemakers, Inc. Apparatus and method for reducing inductor saturation in magnetic fields

Also Published As

Publication number Publication date
BE775903A (fr) 1972-03-16
DE2058509A1 (de) 1972-05-31
NL7114511A (de) 1972-05-30
FR2115417A1 (de) 1972-07-07
AU3617271A (en) 1973-05-31
IT941775B (it) 1973-03-10
FR2115417B1 (de) 1976-06-04
NO133086C (de) 1976-03-10
CH536546A (de) 1973-04-30
DE2058509C3 (de) 1975-07-03
AT314690B (de) 1974-04-25
DE2058509B2 (de) 1974-11-14
SE373975B (de) 1975-02-17
NO133086B (de) 1975-11-24
GB1367298A (en) 1974-09-18

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