EP1648000B1 - Stabförmige Kerndrossel, Vorschaltgerät und Verfahren zur Herstellung - Google Patents

Stabförmige Kerndrossel, Vorschaltgerät und Verfahren zur Herstellung Download PDF

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Publication number
EP1648000B1
EP1648000B1 EP04425773A EP04425773A EP1648000B1 EP 1648000 B1 EP1648000 B1 EP 1648000B1 EP 04425773 A EP04425773 A EP 04425773A EP 04425773 A EP04425773 A EP 04425773A EP 1648000 B1 EP1648000 B1 EP 1648000B1
Authority
EP
European Patent Office
Prior art keywords
core
sheath
choke
rod
bobbin
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.)
Not-in-force
Application number
EP04425773A
Other languages
English (en)
French (fr)
Other versions
EP1648000A1 (de
Inventor
Lorenzo Baldo
Moreno Marton
Roberto Perin
Luca Volpato
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.)
Osram GmbH
Osram SpA
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Osram SpA
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH, Osram SpA filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Priority to AT04425773T priority Critical patent/ATE390698T1/de
Priority to DE602004012751T priority patent/DE602004012751T2/de
Priority to EP04425773A priority patent/EP1648000B1/de
Priority to CN200510113573.6A priority patent/CN1767092A/zh
Publication of EP1648000A1 publication Critical patent/EP1648000A1/de
Application granted granted Critical
Publication of EP1648000B1 publication Critical patent/EP1648000B1/de
Anticipated expiration legal-status Critical
Not-in-force legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/045—Fixed inductances of the signal type  with magnetic core with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core
    • 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
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • H01F27/326—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures specifically adapted for discharge lamp ballasts
    • 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
    • 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
    • H01F38/08—High-leakage transformers or inductances
    • H01F38/10—Ballasts, e.g. for discharge lamps

Definitions

  • the present invention relates to so-called "chokes".
  • Chokes are currently used for interference suppression e.g. in motors of house appliances in order to prevent RF interference on radio, TV equipment and the like.
  • Lamp chokes are also inserted in electronic ballasts of fluorescent lamps with the purpose of limiting the lamp current, especially during the turn-on phase to avoid rapid destruction of the circuit.
  • a rod core choke for interference suppression is disclosed e.g. in DE-A-42 41 604 .
  • a rod core choke is disclosed including a winding having different numbers of layers along the rod core region.
  • the winding is comprised of an insulated wire directly wound onto the ferrite core: such an arrangement is also currently used in so-called "drum” core chokes as used e.g. in compact lamps for low power range applications.
  • a copper wire winding is typically used that is electrically connected through two pins glued at the opposite surfaces of the drum itself.
  • the drum core facilitates direct winding of a copper wire around the ferrite core while the winding is contained laterally between two ferrite disks provided at the end of the core.
  • the ferrite must not be of the low conductivity type and the wire used for the winding must have good insulation characteristics.
  • This disadvantage may be somehow palliated by dipping the whole of the choke into a varnish bath.
  • This processing improves choke insulation and fixes the wire to the flange, thus avoiding dangerous wire scratching on the ferrite.
  • additional processing involves additional costs and may not lead to completely satisfactory results.
  • DE-A-195 20 858 schematically discloses a plastic or metal cap for SMD mounting of a rod core choke.
  • the cap in question has a four-cornered shape, enabling the choke to be laid flat on a printed circuit board (PCB) while the flat surfaces act as electrical contact points for pre-tinned wire ends for use e.g. with automatic flow-soldering machines.
  • PCB printed circuit board
  • Document US 2002/079999 discloses an electrodeless fluorescent lamp comprising a coil that includes a cylindrical ferrite core, a plastic bobbin and a conductive insulated wire wound around a portion of the bobbin.
  • the bobbin includes a base portion and a chimney portion with grooves for driving the wire around the bobbin.
  • the object of the present invention is to provide a choke that satisfies those still outstanding needs.
  • the invention also relates to an electronic ballast including such a choke and the method of manufacturing such a choke.
  • the arrangement described herein provides includes a plastic sheath (bobbin) surrounding the ferrite core in order to provide insulation between the winding wire and the core. In that way, no strict requirements are imposed on the ferrite of the core while the insulation characteristics of the wire do not represent a critical issue.
  • pins can be easily associated with the ends of the winding in view of soldering e.g. to a printed circuit board (PCB).
  • PCB printed circuit board
  • a preferred pin arrangement enables soldering the winding wire at both ends (both towards the PCB or in the opposite direction): this is advantageous insofar as it permits the overall height/thickness of the choke to be reduced.
  • the ferrite core has a simple geometry (in practice, a long and narrow solid shape) and the ends of the winding are contained and precisely positioned longitudinally of the core by flange formations provided at the ends of the bobbin.
  • Ferrite cores with a simple long and narrow solid shape can be easily produced in large numbers by simplifying the industrial process while minimizing the amount of products discarded and without involving any appreciable changes in the PCB layout.
  • a rectangular cross-sectional shape can be easily adapted to the available space on the PCB, maintaining unchanged the lenghth of the core and reducing e.g. the width and increasing the height if only space in the vertical direction is available. The above, within a given volume, to reduce the space taken (i.e. occupied) on the printed circuit board (PCB).
  • a preferred embodiment of the invention is thus a rod core choke, including:
  • reference numeral 1 designates as a whole a rod core choke for use e.g. as a lamp choke included in an electronic ballast of a fluorescent lamp (not shown).
  • the lamp choke 1 is essentially comprised of a copper wire winding 2 wound around a plastic bobbin 3 having a ferrite core 4 inserted therein, so that the bobbin 3 (and the winding 2) surround the core 4.
  • the core 4 is typically in the form of a small rod of a ferrite having long and narrow solid shape.
  • said solid is in form of a parallelepipid.
  • the core 4 is of almost rectangular cross-section (dimensions of 3 x 3.5 millimetres being a typical case in point) with a length in the range of 14 millimetres.
  • those quantitative data are purely exemplary and must not be construed in a limiting sense of the scope of the invention.
  • the bobbin 3 is essentially comprised of an approximately tubular body of a plastic material (such as PBT) of a general beaker-type shape. Stated otherwise, the bobbin 3 is preferably in the form of a tubular body with a rectangular, viz. almost square cross-sectional shape.
  • the tubular body of the bobbin 3 is fully or partly closed at one end 3a and open at the opposite end 3b. In that way, the core 4 can be inserted into the bobbin 3 by longitudinal sliding the core 4 into the bobbin 3 starting from the open end 3b until the end of the core 4 first inserted into the bobbin abuts against the closed end 3a.
  • a small plastics nose 30 at the open end 3b of the bobbin 3 securely retains the core 4 within the bobbin 3 by preventing any relative longitudinal movement of the bobbin (and the winding 2 wound therearound) and the core 4.
  • the core 4 is longitudinally confined between the closed end 3a of the bobbin 3 and the nose 30.
  • the nose is heat-deformed to engage the opposite end of the core 4.
  • This arrangement is advantageous in order to avoid any noisy mechanic resonance frequency during choke operation and any variations in the choke inductance due to different possible relative positioning of the ferrite core 4 and the winding 2 wound around the bobbin 3.
  • chokes 1 corresponding to the arrangement described herein and including 465 turns and 530 turns (corresponding to inductance values of 2.7mH and 3.3mH, respectively) it has been found that a 1% (one percent) variation in the number of turns leads to variations in the inductance value in the range of about 2% (two percent). Such a turn number variation is reasonably sufficient to compensate for any variations in the mechanic/magnetic parameters of the choke.
  • This feature appears to be advantageous, in direct comparison with manufacturing conventional chokes having closed magnetic circuits with E-shaped cores (so-called E-chokes), in that it enables to dispense with any adjusting airgap core system in the production process as normally used in order to achieve the desired the inductance value in choke production lines. This significantly contributes to simplicity and to cost reduction.
  • Reference numerals 31 in Figure 3 designate two flanges (or sets of flange formations) provided at the ends of the tubular body of the bobbin 3. These flanges act as lateral confinement walls or stops for the two ends of the winding 2, thus preventing any undesired longitudinal relative sliding of the winding 2 and the bobbin 3.
  • the reciprocal positioning of the core and the winding greatly influences the inductance value of a choke and its current saturation level, the best magnetic coupling between the core and the winding being obtained when total longitudinal superposition is achieved.
  • a slight relative axial shift between the core and the winding reduces such coupling and the inductance as well as the current saturation level.
  • the arrangement described herein ensures precise location and positioning of the core 4 within the bobbin 3 (via the end confinement formations represented by the closed end 3a and the tooth formation 30) while also ensuring that, once inserted into the bobbin 3, the core 4 retains a well defined axial position to the bobbin 3.
  • the end flanges of 31 of the bobbin 3 in turn ensure proper axial positioning of the winding 2 with respect to the bobbin 3 and thus with respect to the core 4 by also ensuring that this proper axial positioning is maintained over time. This while also preventing the winding wire from coming into contact with any sharp edges as possibly present in the ferrite core 4. Any scratching of the wire insulation by the ferrite is thus securely avoided.
  • An extension 32 typically in the form of additional flanges protruding from the flanges 31 in a plane orthogonal to the plane of the flanges 31 allow easy positioning of metal pins 33 provided at the ends of the bobbin 3.
  • Such metal pins act as connecting pins of the choke winding(s) to a printed circuit board (PCB) 5 as shown in Figure 4 .
  • PCB printed circuit board
  • Figure 4 shows a choke 1 mounted on a PCB together with various other electronic components (collectively designated 6) usually included in an electronic ballast of e.g. fluorescent lamp.
  • the pin layout described allows easy pin insertion at one side of the printed circuit board 5 and soldering thereof on the opposite side of the printed circuit board 5. Moreover, such an arrangement leads to a low profile of the choke that can thus be mounted very close and with reduced "height" with respect to the PCB plane.
  • the arrangement shown allows asymmetric positioning of the two pins 33, which also permits different pin-out versions to be developed depending on the side of the bobbin 3 which is desired to be used for pin insertion in the printed circuit of board 5.
  • the arrangement shown makes it possible to solder the winding at one pin end while inserting the pin into the printed circuit board at the opposite end and vice versa.
  • such an asymmetric pin layout facilitates easy insertion of the ferrite core into the bobbin 3 without interference.
  • the bobbin 3 when assembled with the core, the bobbin 3 is already provided with the pins.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Insulators (AREA)
  • Discharge Lamp (AREA)

Claims (15)

  1. Eine Stangenkerndrosselspule, welche umfasst:
    - einen Kern (4) in Form einer Stange, welcher eine lange und schmale feste Gestalt hat,
    - einen Mantel (Spule - 3) eines elektrisch isolierenden Materials, welcher den Kern (4) umschließt, und
    - eine Drahtwicklung (2) um den Mantel (3), wobei der Mantel (3) gegenseitig den Kern (4) und die Drahtwicklung (2) isoliert,
    dadurch gekennzeichnet, dass der Kern (4) die Form einer Stange, welche einen Spat hat, und dadurch, dass der Mantel (3) mit Flanschgebilden (31) versehen ist, welche Längsbegrenzungsgebilde für die Drahtwicklung (2) bilden.
  2. Die Drosselspule nach Anspruch 1, dadurch gekennzeichnet, dass der Kern (4) einen rechteckigen Querschnitt hat.
  3. Die Drosselspule nach Anspruch 1, dadurch gekennzeichnet, dass der Kern (4) einen quadratischen Querschnitt hat.
  4. Die Drosselspule nach einem der Ansprüche 1 oder 2 oder 3, dadurch gekennzeichnet, dass der Mantel (3) axiale Begrenzungsgebilde (3a, 30) einschließt, um den Kern (4) in einer festen axialen Stellung in dem Mantel (3) zu halten.
  5. Die Drosselspule nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Mantel (3) die Form eines hauptsächlich rohrförmigen Körpers, welcher ein geschlossenes Ende (3a) hat, geformt wird.
  6. Die Drosselspule gemäß den Ansprüchen 4 und 5, dadurch gekennzeichnet, dass das geschlossene Ende (3a) des Mantels (3) ein Widerlagergebilde formt, welches die axiale Versetzung des Kerns (4) in Bezug auf den Mantel (3) über die Widerlagerbedingung entgegen dem geschlossenen Ende (3a) hinaus verhindert.
  7. Die Drosselspule nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Mantel (3) die Form eines im wesentlichen rohrförmigen Körpers, welcher ein geschlossenes Ende (3a) und ein offenes Ende (3b) entgegengesetzt dem geschlossenen Ende (3a) hat, wobei der Kern (4) in den Mantel (3) über das offene Ende (3b) gleitend einführbar ist.
  8. Die Drosselspule gemäß Anspruch 7, dadurch gekennzeichnet, dass das offene Ende (3b) des Mantels (3) ein zugehöriges Gebilde (30) hat, um axiale Versetzung des Kerns (4) welcher in dem Mantel (3) eingeführt ist, aus dem offenen Ende (3b) des Mantels (3) zu verhindern.
  9. Die Drosselspule nach irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sie Endverbindungsstifte (33) der Drahtwicklung (2) einschließt und dass der Mantel (3) Befestigungsgebilde (32, 32a) zum Halten der Verbindungsstifte (33, 33a) einschließt.
  10. Die Drosselspule gemäß Anspruch 9, dadurch gekennzeichnet, dass das Befestigungsgebilde (32) der Drahtwicklung (2) erlaubt, an jedem der Enden von jedem der Stifte gelötet zu werden.
  11. Die Drosselspule nach irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das elektrisch isolierende Material ein Plastikmaterial mit einschließt.
  12. Die Drosselspule gemäß Anspruch 11, dadurch gekennzeichnet, dass das Plastikmaterial PBT ist.
  13. Die Drosselspule nach irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Kern (4) ein Ferritkern ist.
  14. Eine Bettung für eine fluoreszierende Lampe, die die Drosselspule irgendeines der Ansprüche 1 bis 13 einschließt.
  15. Ein Verfahren zum Herstellen einer Stangenkerndrosselspule, wobei das Verfahren die Schritte umfasst:
    - Bereitstellen eines Kerns (4) in der Form einer Stange, welche eine lange und schmale feste Gestalt hat,
    - Umschließen des Kerns (4) mit einem Mantel (Spule 3) eines elektrisch isolierenden Materials, und
    - Wickelns eines Drahts (2) um den Mantel (3), wobei der Mantel (3) gegenseitig den Kern (4) und den Draht (2), welcher um den Mantel (3) gewickelt ist, isoliert,
    dadurch gekennzeichnet, dass der Schritt des Bereitstellens eines Kerns (4) in Form einer Stange, welche eine Spatgestalt hat, einschließt, und dadurch, dass das Verfahren des weiteren das Bereitstellen des Mantels (3) mit Flanschgebilden (31), welche Längsendgebilde für die Drahtwicklung (2) bilden, einschließt.
EP04425773A 2004-10-13 2004-10-13 Stabförmige Kerndrossel, Vorschaltgerät und Verfahren zur Herstellung Not-in-force EP1648000B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT04425773T ATE390698T1 (de) 2004-10-13 2004-10-13 Stabförmige kerndrossel, vorschaltgerät und verfahren zur herstellung
DE602004012751T DE602004012751T2 (de) 2004-10-13 2004-10-13 Stabförmige Kerndrossel, Vorschaltgerät und Verfahren zur Herstellung
EP04425773A EP1648000B1 (de) 2004-10-13 2004-10-13 Stabförmige Kerndrossel, Vorschaltgerät und Verfahren zur Herstellung
CN200510113573.6A CN1767092A (zh) 2004-10-13 2005-10-13 棒芯扼流圈、使用该扼流圈的电子镇流器及其制造方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04425773A EP1648000B1 (de) 2004-10-13 2004-10-13 Stabförmige Kerndrossel, Vorschaltgerät und Verfahren zur Herstellung

Publications (2)

Publication Number Publication Date
EP1648000A1 EP1648000A1 (de) 2006-04-19
EP1648000B1 true EP1648000B1 (de) 2008-03-26

Family

ID=34932825

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04425773A Not-in-force EP1648000B1 (de) 2004-10-13 2004-10-13 Stabförmige Kerndrossel, Vorschaltgerät und Verfahren zur Herstellung

Country Status (4)

Country Link
EP (1) EP1648000B1 (de)
CN (1) CN1767092A (de)
AT (1) ATE390698T1 (de)
DE (1) DE602004012751T2 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023237958A1 (en) * 2022-06-09 2023-12-14 Dh Technologies Development Pte. Ltd. Rf choke for use in a mass spectrometer and rf choke

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2073500A (en) * 1980-03-13 1981-10-14 Vogt Gmbh & Co Kg Methods of making choke coils or the like

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6594885B2 (en) * 2000-12-26 2003-07-22 General Electric Company Method of making a coil

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2073500A (en) * 1980-03-13 1981-10-14 Vogt Gmbh & Co Kg Methods of making choke coils or the like

Also Published As

Publication number Publication date
DE602004012751T2 (de) 2009-05-14
ATE390698T1 (de) 2008-04-15
EP1648000A1 (de) 2006-04-19
CN1767092A (zh) 2006-05-03
DE602004012751D1 (de) 2008-05-08

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