US3906421A - Rod core choke for suppressor application in phase-gating circuits - Google Patents

Rod core choke for suppressor application in phase-gating circuits Download PDF

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Publication number
US3906421A
US3906421A US413637A US41363773A US3906421A US 3906421 A US3906421 A US 3906421A US 413637 A US413637 A US 413637A US 41363773 A US41363773 A US 41363773A US 3906421 A US3906421 A US 3906421A
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United States
Prior art keywords
laminae
choke
coil
additional
lamina
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
Application number
US413637A
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English (en)
Inventor
Josef Wimmer
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.)
Siemens AG
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Siemens AG
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 claimed from DE19722256322 external-priority patent/DE2256322C3/de
Application filed by Siemens AG filed Critical Siemens AG
Application granted granted Critical
Publication of US3906421A publication Critical patent/US3906421A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01F27/33—Arrangements for noise damping
    • 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
    • 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
    • H01F27/366—Electric or magnetic shields or screens made of ferromagnetic material
    • 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 choke structure employing a rod-type core, for suppressor application in phase-gating circuits with controlled semiconductor components, in which the core comprises laminae of standard construction in the electrical engineering art and additional laminae constructed of deep-drawing quality sheet metal, disposed to form a flux shunt, by means of which at least a part of the magnetic flux otherwise closing through air is constrained to follow a magnetic circuit containing virtually no air gap.
  • the invention is directed to a rod-core choke for suppressor application in phase-gating circuits with controlled semiconductor components, in which the choke consists of a coil or winding and a cooperable'rod-core utilizing laminae of standard construction in accordance with electrical engineering techniques.
  • Radio suppressor chokes for damping pulse-type parasitic voltages are known, for example from German Gebrauchsmuster 7,043,934 and 7,1 15,756, in which the cores consist of at least two annular core sections stacked axially one upon the other, with one core section being made of magnetizable iron laminae and the other core section comprising a ferrite core.
  • the ferrite ring thus formed possibly may contain an air gap.
  • the laminae section of the core can be constructed equally as well of deep-drawing quality sheet metal.
  • the invention is directed to the modification of known rod-core chokes in such a manner that their low cost of manufacture is retained, but the coil properties are so altered by skillful modification, that the operating range of the phase-gating circuit to which suppression is being applied can be extended to include lower power levels, enabling regulation thereof without disturbance.
  • this objective is achieved by the utilization of additional laminae constructed of deep-drawing quality sheet metal, by means of at least a part of the magnetic flux otherwise closing through air, is constrained to follow a magnetic circuit containing virtually no air gap.
  • Deep-drawing quality sheet metal has the advantages that it has higher magnetic losses than laminae constructed in accordance with standard electrical engineering, that it exhibits a less marked magnetostriction, so that the inherent noise of the choke is reduced, and that it can be easily worked, in particular, easily bent. Further, rod-core chokes are inherently substantially simpler to manufacture than ring-core chokes.
  • the additional laminae employing deep-drawing quality sheet metal may have a U-shaped configuration with relatively long legs, and when inserted into the coil will replace a corresponding number of laminae of standard construction.
  • the U-shaped laminae are inserted in the coil either from one end only or alternately from both ends. In the embodiment in which they are inserted from both ends, they can be welded together, i.e., spot-welded at overlapping portions so that the mechanical strength of the choke is increased. It is also possible to stamp out the additional laminae in planar form, of U-shaped configuration, with relatively long legs and relatively short bases and to insert them edgewise into the coil so that a corresponding number of standard laminae are replaced.
  • the additional laminae may have a U-shaped configuration in longitudinal cross-section, with relatively short legs and a relatively long base, which may be slid externally over the coil which is, in this case, packed with standard laminae.
  • the choke is manufactured in a conventional manner and thereafter modified to accord with the desired special application. It has been found that the range of disturbance-free operation can be readily adjusted by variation in the number employed of additional U-shaped laminae of deep-drawin g quality.
  • the last-mentioned embodiment may also be modified by employing planar laminae having a U-shaped configuration with relatively short legs and relatively long bases which are slid on edge over a coil packed with laminae of standard construction, the additional laminae in this construction thus being rotated through with respect to those previously described.
  • FIG. 1 schematically illustrates a typical phase-gating circuit employing a controlled semiconductor and suppression facility
  • FIG. 2 is a longitudinal section through a suppressor choke with rodtype core, illustrating the application of the present invention thereto;
  • FIG. 3 is a sectional view similar to FIG. 2 illustrating a further modification of the invention
  • FIG. 4 is a side elevational view of a choke embodying still another modification of the invention.
  • FIG. 5 is an end elevational view of the structure illustrated in FIG. 4;
  • FIG. 6 is a side elevational view similar to FIG. 4 illustrating a further modification of the invention.
  • FIG. 7 is a side elevational view of the construction illustrated in FIG. 6.
  • FIG. 1 there is schematically illustrated, a typical phase-gating circuit employing a controlled semiconductor component and suppression facility.
  • the current from the AC voltage source V flows through the controlled semiconductor H and the suppressor choke L, to the load R and from there back to the voltage source.
  • An additional suppressor action is here achieved by the utilization of a capacitor C.
  • the capacitor C will charge. and when the semiconductor component I-I switches to a lowresistance state, the capacitor C will discharge across the coil L, so that an oscillatory circuit is created whose current flows through the semiconductor component H in addition to the main or power current, as a result of which known types of disturbances can result.
  • Such disturbances become more probable as the main current flowing through the load becomes smaller in relation to the compensating current, which remains the same and is determined by the components L and C.
  • the choke coil 1, having external connections 4 has the central hole or bore thereof partially packed with laminae 2 of standard electrical construction.
  • a lamina 3 constructed of deep-drawing quality sheet metal, and of U-shape in longitudinal cross-section, is provided, such lamina 3 having a pair of relatively long legs and a relatively short base.
  • the lamina 3 has one of its long legs inserted in the central bore of the coil, thus replacing one of the standard laminae otherwise employed, with the free leg being disposed adjacent the outer face of the coil. It will be apparent that with such construction the magnetic flux 5, which would otherwise close through air, is forced to follow a magnetic circuit containing only a small air gap.
  • Several such additional laminae 3 can also be employed.
  • the disturbance-free controllable minimum power of 125 W could be reduced to 100 W when using one such additional lamina and to 60 W when using five such laminae.
  • FIG. 3 illustrates another embodiment, in which two additional U-shaped laminae 3 are inserted "into the core, one from each end, the outermost legs 3 of which may be spot-welded, as indicated at 6, thereby rigidly securing the core laminae in assembled relation.
  • the controllable minimum load achievable with an embodiment of this type, utilizing a total of only two additional laminae was 85 W.
  • additional laminae of U-shaped configuration in longitudinal cross-section, are employed.
  • Such laminae are provided with relatively short legs and relatively long bases which are slipped over the completed rodcorc choke, whereby the respective legs of such additional laminae are disposed adjacent the ends of the standard laminae 2.
  • the latter may be designed to nest one within the other as illustrated in FIGS. 4 and 5.
  • variations in the desired electrical properties can be achieved.
  • the disturbance-free controllable minimum power is 93 W
  • the additional laminae are likewise of U-shaped configuration, employing relatively short legs and relatively long bases, but in this case the laminations are of planar form, for example, punched from flat stock and are assembled in side-by-side relation, i.e., rotated through as compared with the relationship illustrated in the embodiment of FIGS. 4 and 5.
  • a choke employing a rod-type core, for suppressor applications in phase-gating circuits with controlled semiconductor components, the combination of a coil and a plurality of flat, elongated rectangular-shaped laminae disposed in alignment in side by side relation to form a rod-type core, at least one additional lamina, constructed of deep-drawing quality sheet metal, which additional lamina is of U-shaped configuration with relatively long legs and a relatively short base, one leg of which is inserted into the choke coil, taking the place of a corresponding first-mentioned rectangular-shaped lamina, to form a flux shunt, by means of which at least part of the magnetic flux otherwise closing through air, is forced in an almost air-gap-free magnetic loop.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Conversion In General (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Control Of Electrical Variables (AREA)
  • Coils Or Transformers For Communication (AREA)
US413637A 1972-11-16 1973-11-07 Rod core choke for suppressor application in phase-gating circuits Expired - Lifetime US3906421A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722256322 DE2256322C3 (de) 1972-11-16 Stabkerndrossel zur Entstörung von Phasenanschnittschaltungen

Publications (1)

Publication Number Publication Date
US3906421A true US3906421A (en) 1975-09-16

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ID=5861955

Family Applications (1)

Application Number Title Priority Date Filing Date
US413637A Expired - Lifetime US3906421A (en) 1972-11-16 1973-11-07 Rod core choke for suppressor application in phase-gating circuits

Country Status (11)

Country Link
US (1) US3906421A (US06650917-20031118-M00005.png)
JP (1) JPS4981865A (US06650917-20031118-M00005.png)
AT (1) AT334476B (US06650917-20031118-M00005.png)
BE (1) BE807408A (US06650917-20031118-M00005.png)
CH (1) CH563653A5 (US06650917-20031118-M00005.png)
DD (1) DD107542A5 (US06650917-20031118-M00005.png)
FR (1) FR2207339B3 (US06650917-20031118-M00005.png)
GB (1) GB1446927A (US06650917-20031118-M00005.png)
IT (1) IT999308B (US06650917-20031118-M00005.png)
LU (1) LU67651A1 (US06650917-20031118-M00005.png)
NL (1) NL7311589A (US06650917-20031118-M00005.png)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6501365B1 (en) * 2000-09-08 2002-12-31 Oberg Industries Ignition coil having a circular core and a method of making the same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE413716B (sv) * 1978-05-02 1980-06-16 Asea Ab Krafttransformator eller reaktor

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1992822A (en) * 1933-12-01 1935-02-26 Gen Electric Magnetic core
US2059393A (en) * 1933-12-19 1936-11-03 Johnson Lab Inc Magnetic core for high frequency inductances
US2236316A (en) * 1939-08-18 1941-03-25 Chicago Transformer Corp Induction coil
US2602097A (en) * 1948-01-10 1952-07-01 Muller Heinrich Variable electric chokes, transformers, or the like
US3129399A (en) * 1960-02-11 1964-04-14 Hansen Hans Christian Plural part core with exposed wound-core portion
US3748618A (en) * 1971-04-23 1973-07-24 Siemens Ag Radio frequency choke

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1992822A (en) * 1933-12-01 1935-02-26 Gen Electric Magnetic core
US2059393A (en) * 1933-12-19 1936-11-03 Johnson Lab Inc Magnetic core for high frequency inductances
US2236316A (en) * 1939-08-18 1941-03-25 Chicago Transformer Corp Induction coil
US2602097A (en) * 1948-01-10 1952-07-01 Muller Heinrich Variable electric chokes, transformers, or the like
US3129399A (en) * 1960-02-11 1964-04-14 Hansen Hans Christian Plural part core with exposed wound-core portion
US3748618A (en) * 1971-04-23 1973-07-24 Siemens Ag Radio frequency choke

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6501365B1 (en) * 2000-09-08 2002-12-31 Oberg Industries Ignition coil having a circular core and a method of making the same

Also Published As

Publication number Publication date
JPS4981865A (US06650917-20031118-M00005.png) 1974-08-07
BE807408A (fr) 1974-03-15
FR2207339A1 (US06650917-20031118-M00005.png) 1974-06-14
ATA702973A (de) 1976-05-15
LU67651A1 (US06650917-20031118-M00005.png) 1973-07-26
CH563653A5 (US06650917-20031118-M00005.png) 1975-06-30
DD107542A5 (US06650917-20031118-M00005.png) 1974-08-05
DE2256322B2 (de) 1976-08-12
DE2256322A1 (de) 1974-05-30
IT999308B (it) 1976-02-20
AT334476B (de) 1976-01-25
GB1446927A (en) 1976-08-18
NL7311589A (US06650917-20031118-M00005.png) 1974-05-20
FR2207339B3 (US06650917-20031118-M00005.png) 1976-09-24

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