US3439257A - Magnetic core transformer with an adjustable coupling factor - Google Patents

Magnetic core transformer with an adjustable coupling factor Download PDF

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Publication number
US3439257A
US3439257A US543926A US3439257DA US3439257A US 3439257 A US3439257 A US 3439257A US 543926 A US543926 A US 543926A US 3439257D A US3439257D A US 3439257DA US 3439257 A US3439257 A US 3439257A
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United States
Prior art keywords
transformer
control
core
winding
windings
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
US543926A
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English (en)
Inventor
Sigfrid Schweizerhof
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.)
Telefunken Patentverwertungs GmbH
Original Assignee
Telefunken Patentverwertungs GmbH
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 Telefunken Patentverwertungs GmbH filed Critical Telefunken Patentverwertungs GmbH
Application granted granted Critical
Publication of US3439257A publication Critical patent/US3439257A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/14—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias
    • H01F29/146—Constructional details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F19/00—Fixed transformers or mutual inductances of the signal type
    • H01F19/04—Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/14—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/45—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of non-linear magnetic or dielectric devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/45—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of non-linear magnetic or dielectric devices
    • H03K3/51—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of non-linear magnetic or dielectric devices the devices being multi-aperture magnetic cores, e.g. transfluxors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/14—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias
    • H01F2029/143—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias with control winding for generating magnetic bias

Definitions

  • the present invention relates to magnetic core transformers and to such transformers having a variable coupling factor which can be electronically regulated.
  • the objects of the present invention are achieved by providing a transformer having a core with four symmetrically arranged apertures wherein each of the input and output windings penetrates through two different non-adjacent apertures of the core.
  • the arrangement is such that when the input winding is energized, the associated total magnetic flux provided thereby does not permeate the total turn area of the output winding and thereby provides zero coupling.
  • the core may also be produced from a plurality of parts in the interest of more simple production methods and winding techniques for the transformer and particularly for the purpose of using prewound coils which can be slipped onto the core.
  • the core parts may be assembled, for example, with highly machined joints or in the form of an overlapped stacking of transformer laminations.
  • FIGURES 3 and 4 Such a core is illustrated in FIGURES 3 and 4, in which FIGURE 3 is a side view and FIGURE 4 a top view thereof.
  • the core 1 is in the shape of a square and comprises four component cores 1a, 1b, 1c and 1d which bear against one another at their highly machined surfaces.
  • FIGURES 3 and 4 It is apparent from FIGURES 3 and 4 that the two component windings 9 and '10 which are connected in series to form the control winding 8 are arranged in different core apertures than that shown in FIGURES l and 2. However, the direction of the current in these component windings when penetrating the various apertures is such that the effect of the control windings on the input and output windings is the same in both cases.
  • FIG- URE 6 indicates a considerable variation in the output voltage V, which rises from very low values to essentially the full value of the input voltage V with an increase in the control number of ampere-turns 0,
  • the approximation to a zero output voltage in the decoupled state is, in practice, only limited by the asymmetries in the position of the core apertures and by the capacitative coupling between the transmitter windings. These factors, however, do not effect the principle of the present invention and the influence thereof can be reduced to a very great extent.
  • the core for the transformer may have different shapes and may be formed differently.
  • the core may consist of a stack of transformer laminations or may be produced from soft magnetic ferrite materials.
  • Ferrites with low saturation induction and high permeabil1ty are particularly advantageous when control power has to be very low with a low power to be transmitted, for example, in modulators or magnetic amplifiers.
  • ferrites permit the transmission or modulation of high frequencies. Therefore, the transformer structure greatly depends upon the application for such transformer.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Multimedia (AREA)
  • Coils Or Transformers For Communication (AREA)
US543926A 1965-04-22 1966-04-20 Magnetic core transformer with an adjustable coupling factor Expired - Lifetime US3439257A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET28436A DE1263852B (de) 1965-04-22 1965-04-22 Magnetkern-UEbertrager mit einem mittels Steuerstrom veraenderbaren Kopplungsfaktor

Publications (1)

Publication Number Publication Date
US3439257A true US3439257A (en) 1969-04-15

Family

ID=7554172

Family Applications (1)

Application Number Title Priority Date Filing Date
US543926A Expired - Lifetime US3439257A (en) 1965-04-22 1966-04-20 Magnetic core transformer with an adjustable coupling factor

Country Status (5)

Country Link
US (1) US3439257A (en:Method)
DE (1) DE1263852B (en:Method)
FR (1) FR1476324A (en:Method)
GB (1) GB1141611A (en:Method)
SE (1) SE318612B (en:Method)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19843465B4 (de) * 1998-09-22 2005-06-02 Vacuumschmelze Gmbh Stromkompensierte Funkentstördrossel

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2445857A (en) * 1944-11-23 1948-07-27 Automatic Elect Lab Magnetic frequency changer
US2455078A (en) * 1946-08-15 1948-11-30 Automatic Elect Lab Frequency changer
US2461992A (en) * 1945-06-04 1949-02-15 Automatic Elect Lab Magnetic frequency reducer
US2623205A (en) * 1950-05-19 1952-12-23 Automatic Elect Lab Voltage regulating system
US2630478A (en) * 1950-12-06 1953-03-03 Gen Electric Laminated magnetic core for fluorescent ballast systems
US2703388A (en) * 1950-05-16 1955-03-01 Automatic Elect Lab Magnetic cross valve circuits
US2802186A (en) * 1952-04-19 1957-08-06 Cgs Lab Inc Saturable core apparatus
FR1163507A (fr) * 1956-07-17 1958-09-29 Dispositif électrique, utilisable notamment comme bobine de réactance, amplificateur magnétique ou transformateur
US2934727A (en) * 1955-12-29 1960-04-26 Westinghouse Electric Corp Core construction

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2445857A (en) * 1944-11-23 1948-07-27 Automatic Elect Lab Magnetic frequency changer
US2461992A (en) * 1945-06-04 1949-02-15 Automatic Elect Lab Magnetic frequency reducer
US2455078A (en) * 1946-08-15 1948-11-30 Automatic Elect Lab Frequency changer
US2703388A (en) * 1950-05-16 1955-03-01 Automatic Elect Lab Magnetic cross valve circuits
US2623205A (en) * 1950-05-19 1952-12-23 Automatic Elect Lab Voltage regulating system
US2630478A (en) * 1950-12-06 1953-03-03 Gen Electric Laminated magnetic core for fluorescent ballast systems
US2802186A (en) * 1952-04-19 1957-08-06 Cgs Lab Inc Saturable core apparatus
US2934727A (en) * 1955-12-29 1960-04-26 Westinghouse Electric Corp Core construction
FR1163507A (fr) * 1956-07-17 1958-09-29 Dispositif électrique, utilisable notamment comme bobine de réactance, amplificateur magnétique ou transformateur

Also Published As

Publication number Publication date
GB1141611A (en) 1969-01-29
FR1476324A (fr) 1967-04-07
DE1263852B (de) 1968-03-21
SE318612B (en:Method) 1969-12-15

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