EP1049113A2 - Améliorations relatives à des dispositifs magnétiques - Google Patents

Améliorations relatives à des dispositifs magnétiques Download PDF

Info

Publication number
EP1049113A2
EP1049113A2 EP00650039A EP00650039A EP1049113A2 EP 1049113 A2 EP1049113 A2 EP 1049113A2 EP 00650039 A EP00650039 A EP 00650039A EP 00650039 A EP00650039 A EP 00650039A EP 1049113 A2 EP1049113 A2 EP 1049113A2
Authority
EP
European Patent Office
Prior art keywords
core
magnetic
magnetic device
reluctance
housing
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.)
Withdrawn
Application number
EP00650039A
Other languages
German (de)
English (en)
Other versions
EP1049113A3 (fr
Inventor
Karl Rinne
Liam O Suilleabháin
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.)
Artesyn Technologies
Original Assignee
Artesyn Technologies
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 Artesyn Technologies filed Critical Artesyn Technologies
Publication of EP1049113A2 publication Critical patent/EP1049113A2/fr
Publication of EP1049113A3 publication Critical patent/EP1049113A3/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/29—Terminals; Tapping arrangements for signal inductances
    • H01F27/292—Surface mounted devices
    • 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
    • H01F27/027—Casings specially adapted for combination of signal type inductors or transformers with electronic circuits, e.g. mounting on printed circuit boards
    • 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

Definitions

  • the present invention relates to magnetic devices.
  • inductors and transformers are also major contributors to the total cost, weight and size of a converter system.
  • inductors and transformers are also major contributors to the total cost, weight and size of a converter system.
  • the added benefits are: less ferrite, less area/volume, non-coupling of magnetics on a common core while not degrading other electrical parameters including EMI (radiated), examples of which are mentioned in a book by Severns and Bloom, Chapter 12.
  • a major problem that arises by having the components in this configuration is the linking flux that will occur between the individual components and in any coil there will therefore be the normal flux induced within the coil which is produced by self-induction and then there will be a flux introduced into the coil by that produced by mutual induction i.e. caused by dynamic changes in the current of the remaining coils.
  • a further problem with the present methods of integrating magnetic elements is that it is necessary to be very careful in the specification of the performance of the magnetics for production use and in its manufacture to ensure that a consistent magnetic product which may be much more complex than a simple transformer or inductor is produced. It will be appreciated that changing any such device once in production can be much more costly than with discrete magnetic devices because of the intimate relationship that exists between the various inductances and or transformer elements in the larger composite device. Thus, these methods are not, by any means, as efficient as they should be.
  • the present invention is directed towards providing a magnetic device comprising a plurality of separate magnetic components which can be housed in one core without the components interacting.
  • a magnetic device comprising a plurality of separate non-interacting magnetic components housed in the one physical structure, characterised in that each magnetic device has associated therewith a central core of any shape for windings, each central core having a reluctance higher than that of the remainder of the structure.
  • a magnetic device in which the central core includes an external air gap.
  • the central core includes air voids encapsulated in it.
  • a magnetic device in which the central core incorporates non-ferromagnetic material.
  • a magnetic device in which the ferromagnetic device is in the form of layers within the core.
  • every second magnetic pole has an air gap.
  • a method of producing a magnetic device characterised in that the method of winding a coil around each core is critical to the performance of the device, in which considerable ferrite material is saved and in which the physical size of the device is reduced.
  • the core housing forms alternate full or continuous cores and cores with air gaps so that the reluctance can be varied in a controlled manner.
  • non-interactive components can be mounted effectively on the one core. Correct choice of the physical characteristics of the core housing is the key to the present invention.
  • one winding surrounds one pole of the core housing only.
  • FIGs. 1 and 2 there is illustrated a magnetic device indicated generally by the reference numeral 1 comprising two windings or coils 2 and 3.
  • the magnetic device 1 comprises a fabricated ferrite housing 4.
  • Each coil 2 and 3 has a coupling core portion 5 having an air gap 6.
  • this coupling core portion 5 has a reluctance considerably higher than that of its surrounding core.
  • the housing 4 specifically includes top, bottom and side walls 7, 8 and 9 respectively with suitable apertures 8a in the bottom wall 8 for the windings 2 and 3.
  • Fig. 3 which illustrates the equivalent electric circuit
  • the letters A to K illustrate the various positions of flux produced by the flow of the current in the coils 2 and 3.
  • the flux will be downward from A to F and upwards from G to B in the particular example as illustrated in Fig. 3.
  • Fig. 3 RL represents a low resistance equivalent to a low reluctance and RH represents a high resistance due to a high reluctance.
  • the reluctance paths have only been shown as having two reluctances, namely a high reluctance RH all of which are equal and a low reluctance RL. It will be appreciated that there will obviously be different reluctances in that, for example, the reluctance between C and H might be higher or lower than the reluctance between A and F.
  • V1 and V2 are the voltage sources representing the windings. Presuming firstly that V2 is equal to 0, because there is no winding on the second airgap leg and using Kirchoff's voltage and current laws for analysis, we have the following:
  • V represents mmf (magnetic motive force) of the windings
  • I represents the flux ⁇ in the core
  • R represents the reluctance of the core section.
  • the value ⁇ is called the relative permeability of the core and is a scalar value. Therefore, it can be used with electrical parameters in the following analysis.
  • Fig. 4 it will be appreciated that there can be any number of inductors. While the calculation has only been done for inductors, it can be equally well done for transformers.
  • FIG. 5 there is illustrated an alternative construction in which there is provided a magnetic device indicated generally by the reference numeral 10 having three coils 12, 13 and 14 mounted within a housing 15 having a central coupling core portion 16 including a plurality of holes 17 drilled adjacent the coils 12, 13 and 14 respectively.
  • This portion of the core will therefore have much greater reluctance than the rest of the core.
  • the high reluctance path inhibits mutual coupling between the magnetic components by preventing the flux produced by any one component linking the structures that need to be isolated from it.
  • any number of magnetic components can be placed on a common ferrite block of arbitrary shape in such a way that they interact to a very small extent. Essentially therefore the components can be considered to act independently of each other and thus all design and other considerations are simply carried out.
  • the present invention is based on a relatively simple concept that flux from any mmf sources will flow through the path of least reluctance.
  • the amount of flux flowing in a section of ferrite may be reduced by increasing the reluctance of that particular section.
  • This property is used in the invention in order to suppress the amount of mutual coupling in the system. For example when the high reluctant paths are placed as indicated it can be seen from the theoretical analysis given above that the flux linking any of the magnetic components is to all intents and purposes, its own self-linkage. Thus, the components are not in any way affected by the flux induced by the other components.
  • any method of increasing the reluctance of the relevant core sections may be used including airgaps, insulator layers, half gaps, step gaps, drilling holes in the ferrite or any other method of increasing the reluctance of that portion of the circuit.
  • the construction need not have a high reluctance path for each of the magnetic components but can support a situation in which several components may couple due to a low reluctance centre path while those which must remain independent have the high reluctance path described in Figure 4.
  • the low reluctance paths at the outside of the device allow for flux containment or noise reduction and this is beneficial in reducing EMI.
  • This construction is, therefore, superior to one in which the coils are wound on the outer core legs of, say, a planar E core. In that case the coupling would also be low but the stray fields produced may cause interference problems in the application. In fact, the EMI performance is not degraded with respect to separate inductor formations since the outer core legs are closed in this construction.
  • the invention is not confined to cases where the outer core legs have a low reluctance since in some situations, the EMI generated may not be critical to design performance.
  • the construction can be employed for wire wound magnetics, planar magnetics or any other technology that may be utilised to form the coils and ferrite.
  • the construction is not limited to a 2D expansion as implied in Figure 2 but can be expanded upwards in a skyscraper effect if required. In fact, as long as the high reluctance paths are placed correctly there is no limit to the stacking or spreading potential of the structure.
  • planar components can therefore be made, potentially, to be comparable to, or better than, conventional wire wound magnetics in terms of board area used.
  • the design also saves ferrite volume, which is important in a cost critical design.
  • the construction is thus independent of the shape or construction of the core or indeed the material used. It is the choice of different reluctance paths which is essential.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Coils Or Transformers For Communication (AREA)
EP00650039A 1999-04-26 2000-04-26 Améliorations relatives à des dispositifs magnétiques Withdrawn EP1049113A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IE990349 1999-04-26
IE990349 1999-04-26

Publications (2)

Publication Number Publication Date
EP1049113A2 true EP1049113A2 (fr) 2000-11-02
EP1049113A3 EP1049113A3 (fr) 2001-01-17

Family

ID=11042050

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00650039A Withdrawn EP1049113A3 (fr) 1999-04-26 2000-04-26 Améliorations relatives à des dispositifs magnétiques

Country Status (1)

Country Link
EP (1) EP1049113A3 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1727164A3 (fr) * 2005-05-25 2007-09-05 Sumida Corporation Élément magnétique
EP2104114A1 (fr) * 2008-03-20 2009-09-23 Pulse Engineering, Inc. Dispositif inductif multinoyau et son procédé de fabrication
CN103578691A (zh) * 2012-07-26 2014-02-12 浙江海利普电子科技有限公司 扼流圈和emi滤波电路
CN104428848A (zh) * 2012-07-12 2015-03-18 黑拉许克联合股份有限公司 用于存储和滤波的变压器

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1649098A (en) * 1922-09-21 1927-11-15 Rca Corp Electrical communication
US4599985A (en) * 1984-03-30 1986-07-15 Robert Bosch Gmbh Ignition coil for multi-cylinder internal combustion engine
DE3609617A1 (de) * 1986-03-21 1987-09-24 Thomson Brandt Gmbh Spulenkern
US5025241A (en) * 1989-03-28 1991-06-18 Orega Electronique Et Mecanique Transformer of ferrite closed magnetic circuit type
EP0779633A1 (fr) * 1995-06-30 1997-06-18 Hitachi Metals, Ltd. Noyau magnetique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1649098A (en) * 1922-09-21 1927-11-15 Rca Corp Electrical communication
US4599985A (en) * 1984-03-30 1986-07-15 Robert Bosch Gmbh Ignition coil for multi-cylinder internal combustion engine
DE3609617A1 (de) * 1986-03-21 1987-09-24 Thomson Brandt Gmbh Spulenkern
US5025241A (en) * 1989-03-28 1991-06-18 Orega Electronique Et Mecanique Transformer of ferrite closed magnetic circuit type
EP0779633A1 (fr) * 1995-06-30 1997-06-18 Hitachi Metals, Ltd. Noyau magnetique

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1727164A3 (fr) * 2005-05-25 2007-09-05 Sumida Corporation Élément magnétique
US7522028B2 (en) 2005-05-25 2009-04-21 Sumida Corporation Magnetic element
CN1881488B (zh) * 2005-05-25 2010-10-13 胜美达集团株式会社 磁性元件
EP2104114A1 (fr) * 2008-03-20 2009-09-23 Pulse Engineering, Inc. Dispositif inductif multinoyau et son procédé de fabrication
CN104428848A (zh) * 2012-07-12 2015-03-18 黑拉许克联合股份有限公司 用于存储和滤波的变压器
CN103578691A (zh) * 2012-07-26 2014-02-12 浙江海利普电子科技有限公司 扼流圈和emi滤波电路

Also Published As

Publication number Publication date
EP1049113A3 (fr) 2001-01-17

Similar Documents

Publication Publication Date Title
US9842682B2 (en) Modular integrated multi-phase, non-coupled winding power inductor and methods of manufacture
US7317374B2 (en) Self-damped inductor
JP2001068353A (ja) 磁気部品
US4009460A (en) Inductor
US20090091414A1 (en) On-chip inductor for high current applications
US6617950B2 (en) Common mode/differential mode choke
JP6940123B2 (ja) ストレージチョーク（Ｓｔｏｒａｇｅ Ｃｈｏｋｅ）
KR102145338B1 (ko) 환형 자기력 장치
JP3818465B2 (ja) インダクタンス素子
CN112041949B (zh) 感应器装配件
EP1049113A2 (fr) Améliorations relatives à des dispositifs magnétiques
US6642828B2 (en) Airgapped magnetic component
GB2371682A (en) Magnetic bias arrangement for an inductive device
JP2004014549A (ja) 磁心型積層インダクタ
JP4363148B2 (ja) コモンモードノイズフィルタ
US4739294A (en) Device comprising a core consisting of parts of amorphous ferromagnetic metal and parts of non-amorphous ferromagnetic material
US10504645B2 (en) Gapless core reactor
TWI796453B (zh) 整合式多相非耦合電源電感器及製造方法
JP2021019104A (ja) リアクトル装置
JP2580367Y2 (ja) ノイズフィルタ用チョークコイル
JPH03241719A (ja) Ａｃリアクター
JP2005039965A (ja) 限流器
JP3469312B2 (ja) 薄型トランス
JPH11340058A (ja) 複合磁気部品
JPH0635457Y2 (ja) コモンモードチョークコイル

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

RIC1 Information provided on ipc code assigned before grant

Free format text: 7H 01F 3/14 A, 7H 01F 30/10 B, 7H 01F 27/36 B

17P Request for examination filed

Effective date: 20010716

AKX Designation fees paid

Free format text: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

17Q First examination report despatched

Effective date: 20070514

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20071127