WO2005073990A1 - Toroidal choke coil - Google Patents

Toroidal choke coil Download PDF

Info

Publication number
WO2005073990A1
WO2005073990A1 PCT/FI2005/050013 FI2005050013W WO2005073990A1 WO 2005073990 A1 WO2005073990 A1 WO 2005073990A1 FI 2005050013 W FI2005050013 W FI 2005050013W WO 2005073990 A1 WO2005073990 A1 WO 2005073990A1
Authority
WO
WIPO (PCT)
Prior art keywords
choke coil
base
protrusions
winding wire
protrusion
Prior art date
Application number
PCT/FI2005/050013
Other languages
English (en)
French (fr)
Inventor
Reijo Mononen
Original Assignee
Profec Technologies Oy
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 Profec Technologies Oy filed Critical Profec Technologies Oy
Publication of WO2005073990A1 publication Critical patent/WO2005073990A1/en

Links

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
    • H01F17/06—Fixed inductances of the signal type  with magnetic core with core substantially closed in itself, e.g. toroid
    • H01F17/062—Toroidal core with turns of coil around it
    • 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
    • H01F27/022—Encapsulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/04—Arrangements of electric connections to coils, e.g. leads
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/02—Soldered or welded connections
    • H01R4/027—Soldered or welded connections comprising means for positioning or holding the parts to be soldered or welded

Definitions

  • the present invention relates to a toroidal choke coil, comprising a base, a ferromagnetic core, winding wires around the core, and protrusions of the base, the winding wire having its ends fastened thereto.
  • the winding wire 4' coiled around the protrusion 5' has its section 4b 1 constituting a soldering spot, at which the choke coil is joined by means of a solder 10 to its mounting, such as a circuit board.
  • Drawbacks in such a design include the fact that the tail end of a wire may disengage from or slip off the slot 6' with no proper fastening therebetween. This may compromise planarity and thereby add to the soldering problem. Disengagement is possible, especially before the choke coil is fitted (soldered) in place.
  • the solder between a mounting and the soldering spot 4b' of the winding wire 4 shall inevitably have a small surface area, which may lead to a failure of solder and contact breakdowns.
  • each protrusion is encircled by at least two laps of winding wire, which, at least over a section of their extent, provide soldering surfaces for the choke coil, and that each protrusion has a groove in which the winding wire has its end fastened by a press fit.
  • Fig. 1 shows a choke coil of the invention in a view obliquely from above
  • Fig. 2 shows a choke coil of the invention in a view obliquely from below
  • Fig. 3 shows in elevation a press element designed to ensure a coplanarity or flatness for the soldering surfaces of a choke coil
  • Fig. 4 shows a prior art base for a choke coil.
  • figs. 1 and 2 depict a choke coil according to the present invention, designated with reference numeral 1.
  • the choke coil 1 comprises a flat base 2, preferably in a circular shape in terms of its outer rims.
  • the outer rim may have a shape other than this. It can be rectangular, for example.
  • the base 2 has its outer rim, at least over some of the outer rim's total length, formed with rim stiffeners 2a extending perpendicularly from a flat bottom element 2d of the base 2. In this case, the number of rim stiffeners is four.
  • the rim stiffeners 2a conform preferably to the outer rim's radius of curvature and have their edges, at least over a portion of their extent, rising obliquely upward from the bottom element of the base 2.
  • One function of the rim stiffeners 2a is to reinforce the base 2 and to maintain its bottom element as coplanar as possible.
  • a partially cut-out rim stiffener provides the choke coil 1 with a clear escape route for
  • the base 2 includes a central boss 2b, which extends upward from the bottom element in parallel with the outer rim 2a and which fits in the central opening of the coiled toroidal core 3.
  • the central boss 2b has its upper part formed with a flat top 2c, the plane defined thereby being substantially parallel to the bottom element of the base 2.
  • the flat top 2c is designed particularly for an automated assembly device, which can readily and securely take hold of the flat top 2c for placing the choke coil 1 as desired.
  • the central boss 2b, along with the rim stiffeners 2a provides for an easier installation of the core 3.
  • the base 2 has its outer rim provided with four protrusions 5 or arms.
  • the number of protrusions may be other than this.
  • the protrusions 5 are arranged circumferentially along the rim of the base 2 at 90-degree intervals and extend somewhat away from the base rim.
  • the winding wires 4 have the tin-plated tail ends thereof wound around the protrusions 5, such that the protrusion 5 is encircled by at least two complete laps of winding wire.
  • the sections 4b of the winding wires 4, placed along a bottom surface of the protrusions 5, constitute soldering surfaces (four of those) for the choke coil 1, whereby the choke coil 1 is connected to an appliance by soldering the same, for example to a circuit board of the appliance.
  • Reference numeral 12 represents copper-plated pads of a circuit board (not shown), to which the soldering surfaces 4b are to be soldered.
  • the protrusions 5 have bottom surfaces thereof provided with a bottom groove 7.
  • a molten material, such as tin, intended for providing a solder joint, will be permitted to rise to the bottom groove 7 and consequently to surround completely the section 4b of the winding wire 4.
  • each protrusion 5 has its end provided with a groove 6.
  • the groove 6 is preferably orthogonally transverse with respect to the plane of a bottom element and wedge-like tapered in its lengthwise direction (vertical direction of the choke coil).
  • the tapered configuration enables the ends of the winding wires 4 to be fastened with a press fit to the protrusions 5, no other mechanisms being needed for securing the wire 4.
  • one of the protrusions 5 has its end, alongside the tapered groove, preferably formed with an extra protrusion 5a, a lip or the like, which is used for polarizing the choke coil 1. In other words, it can be used for ensuring, for example by the application of computer vision, a correct position of the choke coil 1 before and/or after mounting the choke coil 1 in place.
  • the four discrete soldering surfaces 4b present themselves in planes which are undesirably different from each other. This may cause problems in the process of soldering the choke coil 1 to the circuit board (motherboard) of an appliance.
  • the soldering surfaces 4b of the choke coil 1 shall be made coincidental in terms of their planarities. This is accomplished for example by means of a device shown in fig. 3. It comprises a preferably horizontal stationary a flat panel 9, which is provided with a recess or cavity 9a for accommodating the choke coil 1, the protrusions and the tail sections of a winding wire coiled therearound finding themselves outside the recess or cavity 9a.
  • the choke coil 1 bears against the flat panel 9 adjacent to the edge of the recess 9a.
  • the choke coil 1 has its soldering surfaces 4b facing upward.
  • the protrusions 5 and thereby the soldering surfaces 4b are pressed concurrently, as indicated by arrows shown in fig. 3, with a flat press member 8.
  • the flat surface of a press element 8a forces the soldering surfaces 4b to set in a mutually common plane.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

6 (57) Tiivistelmä Esillä olevan keksinnön kohteena on toroidimainen kuristin (1), johon kuuluu alusta (2), ferromagneettinen sydän (3), käämilangat (4) sydämen (3) ympärillä ja alustan (2) ulokkeet (5), joihin käämilangan (4) päät (4a) on kiinnitetty. Kutakin uloketta (5) ympäröi vähintään kaksi käämilankakierrosta, jotka muodostavat osittaiselta matkal- taan kuristimen (1) juotospinnat (4b). Kussakin ulokkeessa (5) on ura (6), johon käämilangan (4) pää (4a) on kiinnitetty puristustiukkuudella.
PCT/FI2005/050013 2004-02-02 2005-01-24 Toroidal choke coil WO2005073990A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20045024 2004-02-02
FI20045024A FI117408B (fi) 2004-02-02 2004-02-02 Toroidimainen kuristin

Publications (1)

Publication Number Publication Date
WO2005073990A1 true WO2005073990A1 (en) 2005-08-11

Family

ID=31725791

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2005/050013 WO2005073990A1 (en) 2004-02-02 2005-01-24 Toroidal choke coil

Country Status (2)

Country Link
FI (1) FI117408B (fi)
WO (1) WO2005073990A1 (fi)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006133663A1 (de) * 2005-06-16 2006-12-21 Epcos Ag Trägervorrichtung für eine ringkerndrossel, halterung für ein induktives bauelement und induktives bauelement
CN104064337A (zh) * 2014-07-07 2014-09-24 临沂昱通新能源科技有限公司 装有外壳的环形变压器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2163992B1 (de) * 1971-12-22 1973-06-14 Siemens Ag, 1000 Berlin U. 8000 Muenchen Halterungsvorrichtung fur zur Ver bindung mit einer Leiter oder Schicht schaltungsplatte bestimmte Bauelemente
US5212345A (en) * 1992-01-24 1993-05-18 Pulse Engineering, Inc. Self leaded surface mounted coplanar header

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2163992B1 (de) * 1971-12-22 1973-06-14 Siemens Ag, 1000 Berlin U. 8000 Muenchen Halterungsvorrichtung fur zur Ver bindung mit einer Leiter oder Schicht schaltungsplatte bestimmte Bauelemente
US5212345A (en) * 1992-01-24 1993-05-18 Pulse Engineering, Inc. Self leaded surface mounted coplanar header

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006133663A1 (de) * 2005-06-16 2006-12-21 Epcos Ag Trägervorrichtung für eine ringkerndrossel, halterung für ein induktives bauelement und induktives bauelement
US7880579B2 (en) 2005-06-16 2011-02-01 Epcos Ag Carrier device for a toroidal-core choke, holder for an inductive component, and inductive component
CN104064337A (zh) * 2014-07-07 2014-09-24 临沂昱通新能源科技有限公司 装有外壳的环形变压器

Also Published As

Publication number Publication date
FI117408B (fi) 2006-09-29
FI20045024A0 (fi) 2004-02-02
FI20045024A (fi) 2005-08-03

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