EP0444522A1 - Dispositif de bobine - Google Patents

Dispositif de bobine Download PDF

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Publication number
EP0444522A1
EP0444522A1 EP91102491A EP91102491A EP0444522A1 EP 0444522 A1 EP0444522 A1 EP 0444522A1 EP 91102491 A EP91102491 A EP 91102491A EP 91102491 A EP91102491 A EP 91102491A EP 0444522 A1 EP0444522 A1 EP 0444522A1
Authority
EP
European Patent Office
Prior art keywords
coil
magnetic core
magnetic
leg
gaps
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.)
Granted
Application number
EP91102491A
Other languages
German (de)
English (en)
Other versions
EP0444522B1 (fr
Inventor
Shinichiro C/O Tdk Corporation Ito
Yukiharu C/O Tdk Corporation Kinoshita
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.)
TDK Corp
Original Assignee
TDK Corp
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 JP2048830A external-priority patent/JP2791817B2/ja
Priority claimed from JP2264250A external-priority patent/JP2699020B2/ja
Priority claimed from JP2264252A external-priority patent/JP2699021B2/ja
Application filed by TDK Corp filed Critical TDK Corp
Publication of EP0444522A1 publication Critical patent/EP0444522A1/fr
Application granted granted Critical
Publication of EP0444522B1 publication Critical patent/EP0444522B1/fr
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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/346—Preventing or reducing leakage fields
    • 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
    • H01F3/14—Constrictions; Gaps, e.g. air-gaps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/02—Adaptations of transformers or inductances for specific applications or functions for non-linear operation
    • H01F38/023—Adaptations of transformers or inductances for specific applications or functions for non-linear operation of inductances

Definitions

  • the present invention relates to improvements in a coil device for use in a flyback transformer, a switching power transformer, a choke coil or the like and more particularly it relates to improvements in a coil device employing a magnetic core with a gap.
  • any of the conventional transformers, choke coils and so forth known heretofore it is customary to form a gap in a closed magnetic path so that the magnetic core thereof is not saturated when a desired current is caused to flow.
  • a gap is formed there to reduce the effective permeability ⁇ within a range of 50 to 300.
  • This coil device 1' is constructed such that a sectionally U-shaped first magnetic core 2' is combined with a similarly sectionally U-shaped second magnetic core 3' and then a coil 6' is wound around portions of the magnetic cores 2' and 3'.
  • the first magnetic 2' and the second magnetic core 3' have legs 2a' and 3a', respectively.
  • the first magnetic core 2' and the second magnetic core 3' are arranged such hat the first leg 2a' and the first leg 3a' are oppositely faced to each other via a gap 5'.
  • the coil 6' is wound so as to cover the gap 5' within it.
  • the opposing legs 2a' and 3a' are formed into such a shape as one in which their lateral sectional areas become equal to each other over their entire lengths.
  • a B-H curve shown in Fig. 18 shows a data found in the prior art coil device 1'.
  • a maximum flux density Bm of the conventional type of coil device 1' is 5510Gs.
  • Table 1 below indicates a result of measurement of temperatures in a coil center X, a coil end Y, a core Z and a periphery W of the conventional type of the coil device 1' measured by a testing device T' shown in Fig. 16B (Test condition: Frequency 80 kHz, Sine wave of 1.0 A and Ambient temperature of 40°C).
  • the present invention provides a coil device having magnetic cores having gaps at positions opposed to each other at least in a formed magnetic path and a coil wound to include at least one of said gaps characterized in that a shape of at least one of the opposing magnetic cores to form the gaps around which said coil is wound is made as a curve of logarithmic function ranging from its base end part to its extreme end and its extreme end is provided with a flat surface for adjusting the gaps.
  • the aforesaid magnetic cores may be formed by combining the U-shaped cores or E-shaped cores.
  • Figs. 1(a) and (b) are a schematic view and a top plan view for showing a first preferred embodiment of the present invention.
  • Fig. 2 shows a shape of leg forming a gap shown in Fig. 1(a).
  • Figs .3(a) and (b) are a schematic view and a top plan view for showing a coil device of a second preferred embodiment of the present invention.
  • Figs. 4(a) and (b) illustrate a schematic view and a top plan view of a coil device of a third preferred embodiment of the present invention.
  • Figs. 5(a) and (b) illustrate a schematic view and a top plan view for showing a coil device of a fourth preferred embodiment of the present invention.
  • Figs. 6(a) and (b) illustrate a schematic view and a top plan view for showing a coil device of a fourth preferred embodiment of the present invention.
  • Figs. 7(a) and (b) illustrate a schematic view and a top plan view for showing a coil device of a sixth preferred embodiment of the present invention.
  • Figs. 8(a) and 8(b) and Fig. 9 are perspective views for showing legs of the device shown in Figs.1 and 3 to 7, respectively.
  • Figs. 10(a) and (b) illustrate a schematic view and a top plan view for showing a coil device of a seventh preferred embodiment of the present invention.
  • Figs. 11(a) and (b) illustrate a schematic view and a top plan view for showing a coil device of an eighth preferred embodiment of the present invention.
  • Figs. 12 to 14 are perspective views for showing examples of leg portions in the device shown in Figs.10 and 11.
  • Fig. 15 is a B-H curve diagram for a coil device of the present invention.
  • Fig. 16(a) is an illustrative view for showing a method for measuring a temperature at each of the portions in a coil device of the present invention.
  • Fig. 16(b) is an illustrative view for showing a method for measuring a temperature at each of the portions in a coil device of the prior art.
  • Fig. 17 is a schematic view and a top plan view for showing an example of the prior art.
  • Fig. 18 is a B-H curve diagram for a coil device of the prior art.
  • the coil device 1 of the first preferred embodiment shown in Figs. 1(a) and (b) is constructed such that the sectionally U-shaped first magnetic core 2 is combined with the similarly sectionally U-shaped second magnetic core 3 and then a coil 6 is wound around a part of the magnetic cores 2 and 3.
  • the first magnetic core 2 has a first leg part 2a and a second leg part 2b.
  • the second magnetic core 3 has a first leg part 3a and a second lag part 3b.
  • the first and second magnetic cores 2 and 3 are arranged such that each of the first leg 2a, the first leg 3a, the second leg 2b and the second leg 3b is oppositely faced to each other through gaps 5 and 7, respectively.
  • the coil 6 is wound so as to cover one of the gaps 5 in it.
  • the first magnetic core 2 and the second magnetic core 3 are made of ferrite, for example.
  • a shape of each of the opposing first leg 2a and the first leg 3a around which the coil 6 is wound is formed such that a lateral sectional area of an extreme end B is smaller than a lateral sectional area of a base end A and further it has a curved shape given by a logarithmic function.
  • the extreme end B of each of the opposing first legs 2a and 3a around which the coil 6 is wound is provided with a core member 4 having a flat surface as shown in Fig. 2.
  • the core member 4 is used for shaving partially the flat surface in parallel when the gap 5 between the legs 2a and 3a is to be be adjusted. Even if this flat surface is partially shaved, an area at the extreme end surface is not varied, resulting in that a characteristic of the device is not varied and its adjustment can be carried out.
  • the core member 4 is made of ferrite, for example.
  • the coil device 10 of the second preferred embodiment shown in Figs. 3(a) and (b) is constructed such that the sectionally U-shaped first magnetic core 12 is combined with the similarly sectionally U-shaped second magnetic core 13 and the coils 6 are wound around a part of the magnetic cores 12 and 13.
  • the first magnetic core 12 has two first legs 2a of the first preferred embodiment device 1
  • the second magnetic core 13 has two first legs 3a of the first preferred embodiment device 1.
  • Each of the magnetic cores 12 and 13 is arranged so as to be opposed to each other via the gap 5 in the same manner as that of the first preferred embodiment device 1.
  • the coil 6 is wound in such a way as each of the gaps 5 is covered in it.
  • the coil device 20 of the third preferred embodiment of the present invention shown in Fig. 4 is constructed such that the substantially sectionally U-shaped first magnetic core 22 approximating to a flat plate is combined with the sectionally U-shaped second magnetic core 23 and then the coils 6 are wound around a part of the magnetic core 23.
  • the first magnetic core 22 has two slight projecting ends 22a and the second magnetic core 23 has the first two legs 23a having the similar shape as that of the first preferred embodiment device 1.
  • the first and the second magnetic cores 22 and 23 are constructed such that each of the ends 22a and each of the first legs 23a are oppositely faced to each other via gaps 5.
  • the coils 6 are wound around each of the first legs 23a so as to partially cover each of the gaps 5 therein.
  • the coil device 30 of the fourth preferred embodiment of the present invention shown in Fig. 5 is constructed such that the substantially sectionally U-shaped first magnetic core 32 similar to an L-shape is combined with the substantially sectionally U-shaped second magnetic core 33 similar to an L-shape and the coils 6 are wound around a part of each of the magnetic cores 32 and 33.
  • the first magnetic core 32 has a slight projecting end part 32b and the first leg 32a
  • the second magnetic core 33 has a slight projecting end 33b and the first leg 33a.
  • the first and the second magnetic cores 32 and 33 are constructed such that each of the end part 32b and the first leg 33a, and each of the end part 33b and the first leg 32a are oppositely arranged to each other via gaps 5.
  • the coils 6 are wound around each of the first legs 32a and 33a to cover each of the gaps 5 partially within them.
  • Each of the legs 32a and 33a is similarly constructed as that of the legs 2a and 3a of the coil device 1 shown in Fig.1.
  • the coil device 40 of the fifth preferred embodiment of the present invention shown in Fig.6 is constructed such that the sectionally U-shaped first magnetic core 42 is combined with the sectionally U-shaped second magnetic core 43 and the coils 6 are wound around a part of the magnetic cores 42 and 43.
  • the first magnetic core 42 has the first leg 42a and the second leg 42b.
  • the second magnetic core 43 has the first leg 43a and the second leg 43b longer than the leg 42a and the leg 42b of the first magnetic core 42.
  • the first magnetic core 42 and the second magnetic core 43 are constructed such that each of the first leg 42a and the first leg 43a, and each of the second leg 42b and the second leg 43b are oppositely faced to each other via gaps 5.
  • the coils 6 are wound to cover each of the gaps 5 in them.
  • Each of the legs 42a, 42b, 43a and 43b is similarly constructed as that of the legs 2a and 3a of the coil device 1 shown in Fig. 1.
  • the coil device 50 of the sixth preferred embodiment of the present invention shown in Fig. 7 is constructed such that the legs 42b and 43b shown in Fig. 6 are replaced and then the first magnetic core 52 of substantial U-shaped section similar to an L-shape is combined with the second magnetic core 53 of U-shaped section also similar to an L-shape.
  • the magnetic core 8 shown in Fig. 8(a) is made such that a leg 8b of the magnetic core having no coil 6 wound thereonaround is made into a square shape and the other leg 8a is formed into a column.
  • a magnetic core 8' shown in Fig. 8(b) is made such that both legs 8a' and 8b' are made into square shapes and a gap adjusting core member 4' of the leg 8a' around which the coil 6 is wound is formed into a square shape.
  • the magnetic core 9 shown in Fig. 9 is made such that U-shaped square magnetic cores are connected in parallel to each other and one leg 9a is formed into a column. Both of them show a U-shaped section.
  • a practical device is made such that the coils 6 are wound around the column-like legs 8a, 9a or the square leg 8a' while each of the legs having this shape is coupled in pairs, respectively, and each of the figures above shows only one side core.
  • Material for these magnetic cores is ferrite, for example.
  • the coil device 60 of the seventh preferred embodiment of the present invention shown in Fig. 10 is constructed such that the magnetic cores 12 and 13 of the device 10 shown in Fig. 3 are formed into an E-shape.
  • This device 60 is made such that the sectionally E-shaped first magnetic core 62 is coupled with the similarly sectionally E-shaped second magnetic core 63 and the coils 6 are wound around a part of the magnetic cores 62 and 63.
  • the first magnetic core 62 has the first, second and third legs 62a, 62b and 62c
  • the second magnetic core 63 has the first, second and third legs 63a, 63b and 63c.
  • the first and second magnetic cores 62 and 63 are constructed such that the first leg 62a and the first leg 63a, the second leg 62b and the second leg 63b, and the third leg 62c and the third leg 63c are oppositely faced to each other via gaps 5, respectively.
  • the coils 6 are wound to cover each of the gaps 5 therein.
  • the legs 62a to 62c and 63a to 63c are similarly constructed as the legs 2a and 3a of the coil device 1 shown in Fig. 1.
  • the coil device 70 of the eighth preferred embodiment of the present invention shown in Fig. 11 is made such that the magnetic cores 2 and 3 of the coil device 1 shown in Fig. 1 are formed into an E-shape.
  • the device 70 is constructed such that the sectionally E-shaped first magnetic core 72 is combined to the second magnetic core 73, and the coil 6 is wound around a part of the magnetic cores 72 and 73.
  • the first magnetic core 72 has the first, second and third legs 72a, 72b and 72c.
  • the first magnetic core 73 has the first, the second and the third legs 73a, 73b and 73c.
  • the first and the second magnetic cores 72 and 73 are arranged such that the first leg 72a and the first leg 73a, the second leg 72b and the second leg 73b, and the third leg 72c and the third leg 73c are oppositely faced to each other via gaps 5 and 7, respectively.
  • the coil 6 is wound so as to cover the central gap 5 therein.
  • Each of the central legs 72b and 73b is similarly constructed as the legs 2a and 3a of the coil device 1 shown in Fig. 1.
  • the magnetic cores shown in Figs. 12 to 14 are used. That is, the magnetic core shown in Fig. 12 is made such that a magnetic core 63' is formed into an E-shape and a central leg 63a' is formed into a column.
  • the magnetic core shown in Fig. 13 is called as a pot-type core 63' in which a column-like leg 63' is formed at a central part of a cylinder having a bottom part.
  • the magnetic core shown in Fig. 14 is made such that a part of the cylinder of the pot-type core shown in Fig. 13 is cut. Any of them has an E-shaped section.
  • the practical magnetic cores are combined to each other in pairs and then a coil 6 is wound around the central leg 63a' , each of the above figures shows only one core. As the material for these magnetic cores, for example, a ferrite is applied.
  • Table 2 indicates a result of temperature measurement in each of the portions in the coil device produced by each of the preferred embodiments through a comparison with the prior art coil device 1'.
  • the temperature measurement at each of the portions was carried out by using the testing device T shown in Fig. 16(a). (Test condition: Frequency of 80 kHz, 1.0A, Sine wave, Ambient temperature of 40 °C)

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Coils Or Transformers For Communication (AREA)
EP19910102491 1990-02-27 1991-02-20 Dispositif de bobine Expired - Lifetime EP0444522B1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP48830/90 1990-02-27
JP2048830A JP2791817B2 (ja) 1989-02-27 1990-02-27 コイル装置
JP2264250A JP2699020B2 (ja) 1990-10-02 1990-10-02 コイル装置
JP264250/90 1990-10-02
JP2264252A JP2699021B2 (ja) 1990-10-02 1990-10-02 コイル装置
JP264252/90 1990-10-02

Publications (2)

Publication Number Publication Date
EP0444522A1 true EP0444522A1 (fr) 1991-09-04
EP0444522B1 EP0444522B1 (fr) 1995-05-17

Family

ID=27293424

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910102491 Expired - Lifetime EP0444522B1 (fr) 1990-02-27 1991-02-20 Dispositif de bobine

Country Status (2)

Country Link
EP (1) EP0444522B1 (fr)
DE (1) DE69109709T2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2264397A (en) * 1992-02-20 1993-08-25 Gen Electric Low-profile multi-post magnetic core and gap arrangement
EP0729040A1 (fr) * 1995-02-22 1996-08-28 Minnesota Mining And Manufacturing Company Marqueur à noyau de ferrite
EP0755060A1 (fr) * 1995-07-18 1997-01-22 AT&T IPM Corp. Structure de noyau magnétique et son procédé de fabrication
EP1014397A1 (fr) * 1998-12-15 2000-06-28 Alcatel Réactance à champ de dispersion fort pour convertisseur de puissance à commutation
US6417753B1 (en) 2000-02-17 2002-07-09 Koninklijke Philips Electronics N.V. Planar magnetic device without center core leg

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1490564A (fr) * 1966-05-09 1967-08-04 Rech S Magnetiques Soc D Etude Pièces polaires pour l'établissement de champs magnétiques très homogènes
US3434085A (en) * 1967-05-08 1969-03-18 Varian Associates Magnets having logarithmic curved pole caps for producing uniform fields above saturation
US3566323A (en) * 1969-05-01 1971-02-23 Arnold Eng Co C-shaped magnetizable core
US3787790A (en) * 1970-02-27 1974-01-22 Bell & Howell Co Magnetic mass spectrometer with shaped, uniformly saturating magnetic poles
US4282567A (en) * 1976-10-26 1981-08-04 Texas Instruments Incorporated Modified power transformer for self-oscillating converter regulator power supply
DE3123006A1 (de) * 1981-06-10 1983-01-05 Ernst Roederstein Spezialfabrik für Kondensatoren GmbH, 8300 Landshut Transformator

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1490564A (fr) * 1966-05-09 1967-08-04 Rech S Magnetiques Soc D Etude Pièces polaires pour l'établissement de champs magnétiques très homogènes
US3434085A (en) * 1967-05-08 1969-03-18 Varian Associates Magnets having logarithmic curved pole caps for producing uniform fields above saturation
US3566323A (en) * 1969-05-01 1971-02-23 Arnold Eng Co C-shaped magnetizable core
US3787790A (en) * 1970-02-27 1974-01-22 Bell & Howell Co Magnetic mass spectrometer with shaped, uniformly saturating magnetic poles
US4282567A (en) * 1976-10-26 1981-08-04 Texas Instruments Incorporated Modified power transformer for self-oscillating converter regulator power supply
DE3123006A1 (de) * 1981-06-10 1983-01-05 Ernst Roederstein Spezialfabrik für Kondensatoren GmbH, 8300 Landshut Transformator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 4, no. 130 (E-25)(612) 12 September 1980, & JP-A-55 83210 (NIPPON DENSHI K.K.) *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2264397A (en) * 1992-02-20 1993-08-25 Gen Electric Low-profile multi-post magnetic core and gap arrangement
US5414401A (en) * 1992-02-20 1995-05-09 Martin Marietta Corporation High-frequency, low-profile inductor
EP0729040A1 (fr) * 1995-02-22 1996-08-28 Minnesota Mining And Manufacturing Company Marqueur à noyau de ferrite
US5767816A (en) * 1995-02-22 1998-06-16 Minnesota Mining And Manufacturing Company Ferrite core marker
EP0755060A1 (fr) * 1995-07-18 1997-01-22 AT&T IPM Corp. Structure de noyau magnétique et son procédé de fabrication
EP1014397A1 (fr) * 1998-12-15 2000-06-28 Alcatel Réactance à champ de dispersion fort pour convertisseur de puissance à commutation
US6417753B1 (en) 2000-02-17 2002-07-09 Koninklijke Philips Electronics N.V. Planar magnetic device without center core leg

Also Published As

Publication number Publication date
DE69109709D1 (de) 1995-06-22
EP0444522B1 (fr) 1995-05-17
DE69109709T2 (de) 1995-10-05

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