US3878495A - Magnetic core for electrical inductive apparatus - Google Patents

Magnetic core for electrical inductive apparatus Download PDF

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Publication number
US3878495A
US3878495A US485466A US48546674A US3878495A US 3878495 A US3878495 A US 3878495A US 485466 A US485466 A US 485466A US 48546674 A US48546674 A US 48546674A US 3878495 A US3878495 A US 3878495A
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United States
Prior art keywords
core
laminations
legs
magnetic
permeability
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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
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US485466A
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English (en)
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Michael W Thomas
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ABB Inc USA
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Westinghouse Electric Corp
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Priority to US485466A priority Critical patent/US3878495A/en
Application granted granted Critical
Publication of US3878495A publication Critical patent/US3878495A/en
Priority to FR7520259A priority patent/FR2277420A1/fr
Assigned to ABB POWER T&D COMPANY, INC., A DE CORP. reassignment ABB POWER T&D COMPANY, INC., A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WESTINGHOUSE ELECTRIC CORPORATION, A CORP. OF PA.
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
    • 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
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F2003/106—Magnetic circuits using combinations of different magnetic materials

Definitions

  • ABSTRACT PP 485,466 A multiple-legged magnetic core constructed from groups of laminations, with at least two of the groups 52 US. Cl. 336/212; 336/215; 336/217; having Permeabilities- The .P F 336/218 magnetic core 15 constructed of lammatlons havmg 51 Int. Cl. 1101127/24 One Permeability- A gmuP 0f aminamns having a 58 Field of Search 336/218, 214,215, 212, F 1395111011341" each the legs or m the yoke portlons which connect the outer 336/178,2l6,2l7
  • Five-legged magnetic cores have four windows or openings in which the winding structures are located.
  • the openings near each end of the core are smaller than either of the other two openings of the core.
  • the larger openings are required since a portion of the windings disposed around two of the core legs is located therein. whereas a portion of the winding around only one core leg is located in each of the smaller openings.
  • Flux flowing through a core leg which is adjacent to an outer core leg divides and flows across two paths.
  • One path encircles the adjacent large opening and the other path encircles the adjacent smaller opening. Since the lengths of the flux paths differ. and since the amount of flux flowing through a path is dependent upon the length of the path. more flux will flow in the outside leg path if the cross-sectional area and the permeability of the paths are the same.
  • a reduction in harmonic flux and the losses attributable thereto can be realized by balancing the magnetic paths so that the same amount of flux density will be developed in the materials of each path.
  • Reducing the cross-sectional area of the outside path as taught by many prior art arrangements decreases the flux flowing therethrough. but the flux density. which is the quantity which governs saturation. does not change since it is proportional to both the flux and the cross-sectional area. While such area decreasing arrangements have been used in the prior art to reduce the amount of flux in the outside path. the ability of such arrangements to balance the flux density is minimal. Therefore, it is desirable and it is an object of this invention. to provide a five-legged magnetic core in which the flux paths around the windings disposed thereon are balanced. that is. have substantially the same flux density in each path.
  • Four-legged cores are sometimes used in large singlephase transformers.
  • the windings of such transformers are positioned around the inner legs of the core. thereby requiring a larger opening between the two inner core legs than between the inner and outer core legs. Consequently. the flux density in each core leg is not equal and losses caused by saturation of a portion of the magnetic core reduce the efficiency thereof. Therefore. it is desirable. and it is another object of this invention, to provide a four-legged magnetic core in which the flux paths around the windings disposed thereon have substantially the same flux density.
  • each magnetic core contains magnetic laminations which have different permeabilities.
  • the value of permeability and the amount of such laminations is selected to decrease the effective permeability of the magnetic path which traverses the outer leg.
  • the reduction in flux provides a flux density in the outer leg which is substantially equal to the flux density in the remainder of the magnetic core. thus reducing unequal saturation of the core.
  • FIG. 1 is a view of a five-legged transformer constructed according to this invention
  • FIG. 1A is a view of a four-legged transformer constructed according to this invention.
  • FIG. 2 is a portion ofa multiple-legged magnetic core illustrating quantities used to calculate the desired permeability ratio of the magnetic materials in the core;
  • FIG. 3 is a partial view of a magnetic core member illustrating an arrangement for changing the permeability of the magnetic materials
  • FIG. 4 is a partial. cross-sectional view of a magnetic core constructed according to this invention illustrating the junction between the laminations which have different permeabilities.
  • the core I0 includes the inner core legs l2, l4 and 16, the outer core legs 18 and 20, and the core yokes 22 and 24.
  • Each portion of the magnetic core 10 is constructed from a plurality of magnetic laminations stacked together to provide the desired dimensions.
  • the phase windings 26, 28 and 30 are disposed around the inner legs I2, 14 and 16, respectively. and induce flux. when energized. into the legs and yokes of the magnetic core I0.
  • the outer legs 18 and 20 contain segments 32 and 34, respectively. each of which is constructed of a different magnetic material than the remainder of the leg.
  • the magnetic material comprising the segments 32 and 34 has a different permeability than that of the magnetic core materials in the remainder of the core 10.
  • FIG. 2 illustrates the portion of the magnetic core I0 which will be used to describe the functions of the magnetic segment 32.
  • the function of the magnetic segment 34 is similar to that of the segment 32.
  • the flux which flows through the inner leg I2 due to current in the winding thereon divides and travels through the flux paths 36 and 38.
  • the letter-designated dimensions shown in FIG. 2 illustrate that the width a of the opening 40 is smaller than the width of the opening 42.
  • the length of the path 36 is physically shorter than the length of the path 38. If the permeabilities in each path were the same the reluctance of the shorter path 36 would be less than that of the path 38. Since the same magnetomotive force produces the flux in both paths. the flux in the path 36 would be greater than that in the path 38 if the permeabilities are the same.
  • the segment 32 of magnetic material is inserted to increase the effective length of the path 36, thereby decreasing the flux and the flux density along the path 36. it is this change in the permeability of the path 36 which effectively changes the length thereof.
  • the permeability of the magnetic material in the segment 32 may be assigned the value p2. and the permeability of the other magnetic material in the outer leg 18 and in the other portions of the magnetic core may be assigned the value ul.
  • the exciting current l can be found by a similar where H is the magnetic field intensity around the path 38.
  • B For the core to be balanced, B," must be equal to B3. that is. the flux density in paths 36 and 38 must be equal.
  • FIG. 2 has been used in discussing a fivelegged magnetic core. the same principle discussed applies to four-legged magnetic cores. In using FlG .2 for analyzing a four-legged core. only one outer leg is not illustrated compared to one outer and one inner leg for the five-legged core analysis.
  • the segment 32 of magnetic material can be placed anywhere along the magnetic path 36 except in the leg 12.
  • the permeability of the magnetic material comprising the segment 32 must be different than that of the other magnetic materials in the core.
  • the difference in permeability may be obtained by using a different magnetic material, by using the same basic material which has been processed differently. or by various other methods.
  • FIG. 1A is a view of a four-legged magnetic core with single-phase windings 112 and 114 disposed thereon.
  • the core 110 includes the outer legs 116 and 118, the inner legs E and 122 and the core yokes 124 and 126.
  • the outer legs contain the segments 128 and 130 which are constructed from a magnetic material which has a lower permeability than the other magnetic material in the core 110 to provide the effective increase in magnetic paths as hcreinbefore discussed.
  • the grain orientation of the laminations 46 and 48 is aligned in the direction indicated by the arrows 50 and 52.
  • the laminations 44 which may be used to construct the segment 32 shown in FIGS. 1 and 2, have their grain orientation aligned with the arrow 54 which is displaced by an angle 6 from the direction of the arrows 50 and 52.
  • the laminations 44, 46 and 48 can be constructed of the same magnetic material which has been cut at different angles with respect to the grain orientation. In many magnetic materials. the angle 0 can be less than 10 for a change in permeability of several magnitudes.
  • the segment 32 of magnetic material may take many different forms in the path 36. FIG.
  • the laminations 56 can be constructed of magnetic material which has been cut at an angle to its grain orientation.
  • the arrangement shown in FIG. 4 provides a stronger core than an arrangement which uses butt-type joints between the different laminations.
  • some of the laminations 56 may have different grain orientations to provide a segment having the desired overall permeability.
  • a magnetic core comprising:
  • first and second laminated inner core legs suitable for the placement of windings therearound;
  • first and second laminated cores yokes which magnetically connect together the inner core legs and the outer core legs;
  • said first and second laminated outer core legs respectively providing first and second magnetic paths with the core yokes, with said first and second paths each containing a first group of laminations having a first predetermined permeability and a second group of laminations having a second and different permeability.
  • the magnetic core of claim 1 wherein the first magnetic path traverses the first outer core leg. the first inner core leg, and the portions of the core yokes connecting said legs, and wherein a third magnetic path traverses the first and second inner core legs and the portions of the core yokes connecting said legs.
  • the permeability of the laminations in the second group of laminations of the first outer core leg having a value of permeability which makes the effective length of the first and third magnetic paths substantially equal.
  • a five-legged magnetic core comprising:
  • first. second and third laminated inner core legs first.
  • first and second laminated core yokes which magnetically connect together the inner core legs and the outer core legs
  • said first and second outer magnetic core legs con taining laminations having a lower permeability than the permeability of substantially all the laminations in the remainder of the magnetic core.
  • a four-legged magnetic core comprising:
  • first and second laminated inner core legs
  • first and second laminated outer core legs and
  • first and second laminated core yokes which magnetically connect together the inner core legs and the outer core legs
  • said first and second outer magnetic core legs containing laminations having a lower permeability than the permeability of substantially all the laminations in the remainder of the magnetic core.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
US485466A 1974-07-02 1974-07-02 Magnetic core for electrical inductive apparatus Expired - Lifetime US3878495A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US485466A US3878495A (en) 1974-07-02 1974-07-02 Magnetic core for electrical inductive apparatus
FR7520259A FR2277420A1 (fr) 1974-07-02 1975-06-27 Circuit magnetique d'appareillage electrique a induction

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Application Number Priority Date Filing Date Title
US485466A US3878495A (en) 1974-07-02 1974-07-02 Magnetic core for electrical inductive apparatus

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FR (1) FR2277420A1 (ru)

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4205288A (en) * 1978-10-27 1980-05-27 Westinghouse Electric Corp. Transformer with parallel magnetic circuits of unequal mean lengths and loss characteristics
EP0121846A1 (de) * 1983-04-09 1984-10-17 Vacuumschmelze GmbH Hochstromdrossel
US4943793A (en) * 1988-12-27 1990-07-24 General Electric Company Dual-permeability core structure for use in high-frequency magnetic components
US6456184B1 (en) 2000-12-29 2002-09-24 Abb Inc. Reduced-cost core for an electrical-power transformer
US20040113741A1 (en) * 2002-12-13 2004-06-17 Jieli Li Method for making magnetic components with N-phase coupling, and related inductor structures
US20040248280A1 (en) * 2000-07-11 2004-12-09 Bolla Robert I. Animal feed containing polypeptides
US20080246577A1 (en) * 2002-12-13 2008-10-09 Volterra Semiconductor Corporation Method For Making Magnetic Components With N-Phase Coupling, And Related Inductor Structures
US20090179723A1 (en) * 2002-12-13 2009-07-16 Volterra Semiconductor Corporation Method For Making Magnetic Components With M-Phase Coupling, And Related Inductor Structures
US20090231081A1 (en) * 2008-03-14 2009-09-17 Alexandr Ikriannikov Voltage Converter Inductor Having A Nonlinear Inductance Value
US20110032068A1 (en) * 2009-08-10 2011-02-10 Alexandr Ikriannikov Coupled Inductor With Improved Leakage Inductance Control
US20110035607A1 (en) * 2009-08-10 2011-02-10 Alexandr Ikriannikov Coupled Inductor With Improved Leakage Inductance Control
US7898379B1 (en) 2002-12-13 2011-03-01 Volterra Semiconductor Corporation Method for making magnetic components with N-phase coupling, and related inductor structures
US20110148560A1 (en) * 2009-12-21 2011-06-23 Alexandr Ikriannikov Two-Phase Coupled Inductors Which Promote Improved Printed Circuit Board Layout
US20110148559A1 (en) * 2009-12-21 2011-06-23 Alexandr Ikriannikov multi-turn inductors
US20110169476A1 (en) * 2010-01-14 2011-07-14 Alexandr Ikriannikov Asymmetrical Coupled Inductors And Associated Methods
WO2012110085A1 (de) * 2011-02-16 2012-08-23 Siemens Aktiengesellschaft Magnetischer kern gebildet aus blechlamellen mit unterschiedlicher kornorientierung
US8299885B2 (en) 2002-12-13 2012-10-30 Volterra Semiconductor Corporation Method for making magnetic components with M-phase coupling, and related inductor structures
US8405478B1 (en) * 2008-12-15 2013-03-26 Marvell International Ltd. Low loss magnetic core
US8674802B2 (en) 2009-12-21 2014-03-18 Volterra Semiconductor Corporation Multi-turn inductors
US8975995B1 (en) 2012-08-29 2015-03-10 Volterra Semiconductor Corporation Coupled inductors with leakage plates, and associated systems and methods
US8988177B1 (en) 2008-12-15 2015-03-24 Marvell International Ltd. Magnetic core having flux paths with substantially equivalent reluctance
US9019063B2 (en) 2009-08-10 2015-04-28 Volterra Semiconductor Corporation Coupled inductor with improved leakage inductance control
US9287038B2 (en) 2013-03-13 2016-03-15 Volterra Semiconductor LLC Coupled inductors with non-uniform winding terminal distributions
US9373438B1 (en) 2011-11-22 2016-06-21 Volterra Semiconductor LLC Coupled inductor arrays and associated methods
US10128035B2 (en) 2011-11-22 2018-11-13 Volterra Semiconductor LLC Coupled inductor arrays and associated methods
US10256031B2 (en) 2015-02-24 2019-04-09 Maxim Integrated Products, Inc. Low-profile coupled inductors with leakage control

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57126112A (en) * 1981-01-29 1982-08-05 Nippon Steel Corp Laminated iron core for transformer

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1425091A (en) * 1922-08-08 Polyphase transformer
US1761732A (en) * 1928-01-28 1930-06-03 Gen Electric Transformer
US2779926A (en) * 1954-01-25 1957-01-29 Gen Electric Transformer with five-leg core
US2932787A (en) * 1956-03-19 1960-04-12 Allis Chalmers Mfg Co Magnetic amplifier

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1425091A (en) * 1922-08-08 Polyphase transformer
US1761732A (en) * 1928-01-28 1930-06-03 Gen Electric Transformer
US2779926A (en) * 1954-01-25 1957-01-29 Gen Electric Transformer with five-leg core
US2932787A (en) * 1956-03-19 1960-04-12 Allis Chalmers Mfg Co Magnetic amplifier

Cited By (58)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4205288A (en) * 1978-10-27 1980-05-27 Westinghouse Electric Corp. Transformer with parallel magnetic circuits of unequal mean lengths and loss characteristics
EP0121846A1 (de) * 1983-04-09 1984-10-17 Vacuumschmelze GmbH Hochstromdrossel
US4943793A (en) * 1988-12-27 1990-07-24 General Electric Company Dual-permeability core structure for use in high-frequency magnetic components
US7795003B2 (en) 2000-07-11 2010-09-14 Bolla Robert I Animal feed containing polypeptides
US20040248280A1 (en) * 2000-07-11 2004-12-09 Bolla Robert I. Animal feed containing polypeptides
US6456184B1 (en) 2000-12-29 2002-09-24 Abb Inc. Reduced-cost core for an electrical-power transformer
US8847722B2 (en) 2002-12-13 2014-09-30 Volterra Semiconductor Corporation Method for making magnetic components with N-phase coupling, and related inductor structures
US7525408B1 (en) 2002-12-13 2009-04-28 Volterra Semiconductor Corporation Method for making magnetic components with N-phase coupling, and related inductor structures
US7498920B2 (en) 2002-12-13 2009-03-03 Volterra Semiconductor Corporation Method for making magnetic components with N-phase coupling, and related inductor structures
US9147515B2 (en) 2002-12-13 2015-09-29 Volterra Semiconductor LLC Method for making magnetic components with M-phase coupling, and related inductor structures
US8299885B2 (en) 2002-12-13 2012-10-30 Volterra Semiconductor Corporation Method for making magnetic components with M-phase coupling, and related inductor structures
US9019064B2 (en) 2002-12-13 2015-04-28 Volterra Semiconductor Corporation Method for making magnetic components with M-phase coupling, and related inductor structures
US20040113741A1 (en) * 2002-12-13 2004-06-17 Jieli Li Method for making magnetic components with N-phase coupling, and related inductor structures
US7746209B1 (en) 2002-12-13 2010-06-29 Volterra Semiconductor Corporation Method for making magnetic components with N-phase coupling, and related inductor structures
US7772955B1 (en) 2002-12-13 2010-08-10 Volterra Semiconductor Corporation Method for making magnetic components with N-phase coupling, and related inductor structures
US7352269B2 (en) * 2002-12-13 2008-04-01 Volterra Semiconductor Corporation Method for making magnetic components with N-phase coupling, and related inductor structures
US7864016B1 (en) 2002-12-13 2011-01-04 Volterra Semiconductor Corporation Method for making magnetic components with N-phase coupling, and related inductor structures
US8836461B2 (en) 2002-12-13 2014-09-16 Volterra Semiconductor Corporation Method for making magnetic components with M-phase coupling, and related inductor structures
US8786395B2 (en) 2002-12-13 2014-07-22 Volterra Semiconductor Corporation Method for making magnetic components with M-phase coupling, and related inductor structures
US7893806B1 (en) 2002-12-13 2011-02-22 Volterra Semiconductor Corporation Method for making magnetic components with N-phase coupling, and related inductor structures
US7898379B1 (en) 2002-12-13 2011-03-01 Volterra Semiconductor Corporation Method for making magnetic components with N-phase coupling, and related inductor structures
US7965165B2 (en) 2002-12-13 2011-06-21 Volterra Semiconductor Corporation Method for making magnetic components with M-phase coupling, and related inductor structures
US8779885B2 (en) 2002-12-13 2014-07-15 Volterra Semiconductor Corporation Method for making magnetic components with M-phase coupling, and related inductor structures
US8350658B1 (en) 2002-12-13 2013-01-08 Volterra Semiconductor Corporation Method for making magnetic components with N-phase coupling, and related inductor structures
US20080246577A1 (en) * 2002-12-13 2008-10-09 Volterra Semiconductor Corporation Method For Making Magnetic Components With N-Phase Coupling, And Related Inductor Structures
US20090179723A1 (en) * 2002-12-13 2009-07-16 Volterra Semiconductor Corporation Method For Making Magnetic Components With M-Phase Coupling, And Related Inductor Structures
US20090237197A1 (en) * 2008-03-14 2009-09-24 Alexandr Ikriannikov Method For Making Magnetic Components With M-Phase Coupling, And Related Inductor Structures
US20090231081A1 (en) * 2008-03-14 2009-09-17 Alexandr Ikriannikov Voltage Converter Inductor Having A Nonlinear Inductance Value
US8294544B2 (en) * 2008-03-14 2012-10-23 Volterra Semiconductor Corporation Method for making magnetic components with M-phase coupling, and related inductor structures
US9627125B2 (en) 2008-03-14 2017-04-18 Volterra Semiconductor LLC Voltage converter inductor having a nonlinear inductance value
US8836463B2 (en) 2008-03-14 2014-09-16 Volterra Semiconductor Corporation Voltage converter inductor having a nonlinear inductance value
US8988177B1 (en) 2008-12-15 2015-03-24 Marvell International Ltd. Magnetic core having flux paths with substantially equivalent reluctance
US8405478B1 (en) * 2008-12-15 2013-03-26 Marvell International Ltd. Low loss magnetic core
US8760249B1 (en) 2008-12-15 2014-06-24 Marvell International Ltd. Method and apparatus for increasing energy effeciency of a magnetic core
US20110032068A1 (en) * 2009-08-10 2011-02-10 Alexandr Ikriannikov Coupled Inductor With Improved Leakage Inductance Control
US9019063B2 (en) 2009-08-10 2015-04-28 Volterra Semiconductor Corporation Coupled inductor with improved leakage inductance control
US20110035607A1 (en) * 2009-08-10 2011-02-10 Alexandr Ikriannikov Coupled Inductor With Improved Leakage Inductance Control
US8102233B2 (en) 2009-08-10 2012-01-24 Volterra Semiconductor Corporation Coupled inductor with improved leakage inductance control
US8237530B2 (en) 2009-08-10 2012-08-07 Volterra Semiconductor Corporation Coupled inductor with improved leakage inductance control
US7994888B2 (en) 2009-12-21 2011-08-09 Volterra Semiconductor Corporation Multi-turn inductors
US8890644B2 (en) 2009-12-21 2014-11-18 Volterra Semiconductor LLC Two-phase coupled inductors which promote improved printed circuit board layout
US8674802B2 (en) 2009-12-21 2014-03-18 Volterra Semiconductor Corporation Multi-turn inductors
US8362867B2 (en) 2009-12-21 2013-01-29 Volterra Semicanductor Corporation Multi-turn inductors
US20110148560A1 (en) * 2009-12-21 2011-06-23 Alexandr Ikriannikov Two-Phase Coupled Inductors Which Promote Improved Printed Circuit Board Layout
US9281115B2 (en) 2009-12-21 2016-03-08 Volterra Semiconductor LLC Multi-turn inductors
US20110148559A1 (en) * 2009-12-21 2011-06-23 Alexandr Ikriannikov multi-turn inductors
US8174348B2 (en) 2009-12-21 2012-05-08 Volterra Semiconductor Corporation Two-phase coupled inductors which promote improved printed circuit board layout
US20110169476A1 (en) * 2010-01-14 2011-07-14 Alexandr Ikriannikov Asymmetrical Coupled Inductors And Associated Methods
US8330567B2 (en) 2010-01-14 2012-12-11 Volterra Semiconductor Corporation Asymmetrical coupled inductors and associated methods
WO2012110085A1 (de) * 2011-02-16 2012-08-23 Siemens Aktiengesellschaft Magnetischer kern gebildet aus blechlamellen mit unterschiedlicher kornorientierung
US9373438B1 (en) 2011-11-22 2016-06-21 Volterra Semiconductor LLC Coupled inductor arrays and associated methods
US10128035B2 (en) 2011-11-22 2018-11-13 Volterra Semiconductor LLC Coupled inductor arrays and associated methods
US8975995B1 (en) 2012-08-29 2015-03-10 Volterra Semiconductor Corporation Coupled inductors with leakage plates, and associated systems and methods
US9721719B1 (en) 2012-08-29 2017-08-01 Volterra Semiconductor LLC Coupled inductors with leakage plates, and associated systems and methods
US9287038B2 (en) 2013-03-13 2016-03-15 Volterra Semiconductor LLC Coupled inductors with non-uniform winding terminal distributions
US9704629B2 (en) 2013-03-13 2017-07-11 Volterra Semiconductor LLC Coupled inductors with non-uniform winding terminal distributions
US10276288B2 (en) 2013-03-13 2019-04-30 Volterra Semiconductor LLC Coupled inductors with non-uniform winding terminal distributions
US10256031B2 (en) 2015-02-24 2019-04-09 Maxim Integrated Products, Inc. Low-profile coupled inductors with leakage control

Also Published As

Publication number Publication date
FR2277420A1 (fr) 1976-01-30
FR2277420B1 (ru) 1981-12-18

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