EP3128522B1 - Coil body - Google Patents

Coil body Download PDF

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Publication number
EP3128522B1
EP3128522B1 EP16179542.2A EP16179542A EP3128522B1 EP 3128522 B1 EP3128522 B1 EP 3128522B1 EP 16179542 A EP16179542 A EP 16179542A EP 3128522 B1 EP3128522 B1 EP 3128522B1
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EP
European Patent Office
Prior art keywords
housing body
coil
housing
guide
along
Prior art date
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Active
Application number
EP16179542.2A
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German (de)
French (fr)
Other versions
EP3128522A3 (en
EP3128522A2 (en
Inventor
Johann Böldl
Rainer Pilsl
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.)
Sumida Components and Modules GmbH
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Sumida Components and Modules GmbH
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Publication of EP3128522A2 publication Critical patent/EP3128522A2/en
Publication of EP3128522A3 publication Critical patent/EP3128522A3/en
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Publication of EP3128522B1 publication Critical patent/EP3128522B1/en
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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
    • H01F27/02—Casings
    • H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements
    • 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
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/266—Fastening or mounting the core on casing or support
    • 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
    • H01F27/2823—Wires
    • H01F27/2828—Construction of conductive connections, of leads
    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • 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
    • H01F27/323—Insulation between winding turns, between winding layers
    • 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
    • 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
    • H01F2005/043—Arrangements of electric connections to coils, e.g. leads having multiple pin terminals, e.g. arranged in two parallel lines at both sides of the coil
    • 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
    • H01F2005/046—Details of formers and pin terminals related to mounting on printed circuits
    • 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
    • H01F2027/297—Terminals; Tapping arrangements for signal inductances with pin-like terminal to be inserted in hole of printed path

Definitions

  • the present invention relates to a bobbin for inductive components such as transformers and chokes.
  • Inductive components such as chokes and transformers are used in many technical areas, for example in the automotive industry.
  • printed circuit board components are used in automotive electronics, such as in power electronics, in which so-called pulse transformers or pulse transformers are used to control the gate of an electronic switching element.
  • a "gate-drive transformer” represents a pulse transformer that controls the timing of power MOSFETs or IGBTs in switch-mode power supplies ("switch-mode-power-supply" or SMPS), such as in the Publication "A guide to designing gate drive transformers", power electronics technology, 2007: 32 to 36 , illustrated by Patrick Scoggins.
  • Gate drive transformers typically have a coil supported by a bobbin, which can be in the form of either surface mount (SMD) components or through-hole components.
  • SMD surface mount
  • safety standards must be observed which, among other things, require compliance with insulation and creepage distances.
  • the specifications for creepage and insulation distances are normally met by encapsulating the bobbins in a housing with a casting compound.
  • reflow soldering processes are carried out in order, among other things, to connect inductive components to printed circuit boards electrically and mechanically.
  • High temperatures occur during the soldering process, so that a component in the manufacturing process is often exposed to temperature fluctuations of 100°C or more.
  • the potting compound often tears, which greatly reduces the creepage and clearance distances of an inductive component and the standard requirements of IEC/UL etc. can no longer be met.
  • a component can continue to be exposed to temperature fluctuations.
  • automotive electronics in the vicinity of the engine are also exposed to high temperature fluctuations during operation from -40°C to +155°C or more.
  • electrical and electronic components of automotive electronics are subject to high mechanical loads due to vibrations.
  • the font JP 2009 272434 A shows a coil component having a toroidal core wound by coils, a base member having a bottom surface and wall portions, and having a receiving portion into which the toroidal core is received. links provided on a fixing side of the base member, and groove portions formed on the wall portions and guided to the end portions of the coils.
  • the toroidal core is mounted with its central axis nearly perpendicular to the bottom surface of the accommodating portion, groove portions are formed to the depth of the bottom surface of the accommodating portion, and terminal portions of the coils are respectively fixed while being bundled to each of the terminal members.
  • a housing for accommodating an electrical component with a hollow housing body having an opening formed by a bottom below the opening, a lid above the opening and two side walls adjacent to the opening and at least two provided at the bottom of the housing having electrical contacts on opposite sides of the housing.
  • a first contact of the electrical contacts is located in the area of the opening.
  • a toroidal transformer with holder is known, from which axis-parallel connecting pins protrude for plugging into printed circuits, the toroidal core being provided with a plurality of windings which are spatially fixed in a plurality of sections distributed over the circumference.
  • the support of the toroidal core is a pot whose outer diameter is adjusted and is made of a non-conductive and non-magnetic material.
  • the hollow-cylindrical wall of the pot has axially parallel slots or grooves distributed along the circumference, and the bottom of the pot has a circular hole in the middle, the diameter of which is approximately equal to the inner diameter of the toroidal core.
  • the windings of the toroid run in the slots or grooves and around the bottom part of the pot and are soldered to the terminal pins so that the toroid is mechanically connected to the pot by the windings.
  • the font DE 23 28 227 A1 shows a coil wound on a bobbin, the winding ends of which are arranged in slots.
  • the grooves are located on an additional groove carrier that can be fastened to the coil core or the coil body.
  • the present invention provides a solution to the above problem in various aspects.
  • it is proposed to replace the casting compound with appropriately designed structural measures. According to the invention, this is achieved in that the creepage distances are lengthened, so that the casting compound can be dispensed with.
  • a bobbin is provided with a hollow housing body having an opening on a first side for receiving a coil in the housing body along an insertion direction and a housing wall extending between a first side of the housing body and an opposite second side .
  • the housing body also has a plurality of electrical contacts and a plurality of guide grooves running along the housing wall, each of which is designed to guide a connecting wire in order to connect a coil accommodated by the bobbin to the contacts which are arranged on the second side of the housing.
  • the coil body also has slots formed at the edge of the opening, which are arranged at the opening in the circumferential direction, so that a defined passage into and out of the housing body is provided for each guide groove.
  • the guide grooves are formed by ribs that protrude from the housing wall and run parallel along the direction of insertion.
  • two ribs each form a guide groove and the ribs of one guide groove are all spaced apart from the ribs of another guide groove, so that an isolation groove is formed between each two guide grooves.
  • At least one guide groove extends completely along the housing wall.
  • the housing body is designed to accommodate a toroidal coil.
  • the guide grooves are formed by ribs that protrude from the housing wall and run parallel along the insertion direction. In this way, guide grooves for efficiently extending the creepage distance are provided in a simple manner.
  • every two ribs form a guide groove and the ribs of each guide groove are all spaced apart from the ribs of the other guide grooves, so that an isolation groove is formed between each two guide grooves.
  • the isolation grooves have different depths.
  • the withstand voltage is further increased that the insulating grooves of greater depth are respectively provided between the guide grooves in which the lead wires having a greater potential are laid. A more compact design of the coil body can thus be achieved.
  • FIG. 12 schematically shows a perspective view of a bobbin having a hollow housing body 110.
  • the housing body 110 is preferably designed to receive a toroidal coil (coil not shown).
  • the coil may include a magnetic core (not shown) and at least one winding (not shown). Alternatively, the coil can be provided without a magnetic core.
  • the housing body 110 has an opening 112 on a first side A of the housing body 110, so that a coil (not shown) along an in Fig. 1a can be inserted into the case body 110 in the direction denoted by the reference character "C".
  • the housing body 110 is preferably closed on a second side B opposite the first side A.
  • a base 115 is provided in the housing body, which serves as a support surface for a coil (not shown) accommodated in the housing body.
  • a housing wall 114 extends between the first side A and the second side B, so that a coil accommodated in the housing body 110 is surrounded by the bottom 115 and the housing wall 114 .
  • Guide grooves 130 running parallel to direction C are formed in the housing wall 114 between the first side A and the second side B.
  • the guide grooves 130 preferably extend entirely along the housing wall between the first side A and the second side B of the housing body 110.
  • Each of the guide grooves 130 is preferably configured to fully receive a lead wire, ie, a depth of each guide groove 130 is greater than or equal to one Connection wire diameter (not shown).
  • the second side B has a plurality of contacts 120 attached thereto.
  • the plurality of contacts is used to electrically and mechanically attach coil body 100 to a printed circuit board (not shown).
  • at least one contact 120 for an electrical and/or mechanical connection between the printed circuit board (not shown) and coil body 100 can be provided.
  • the contacts 120 can be L-shaped and protrude downwards from the housing body 110 along the direction C.
  • an exposed end of the at least one contact 120 is preferably bent along a direction perpendicular to the C direction.
  • an SMD component is provided.
  • the exposed ends of the contacts 120 extend substantially along a direction parallel to direction C such that the contacts 120 are formed as a through-hole contact.
  • Fig. 1b 12 is a plan view of the case body 110 (taken along the direction C in Fig. 1a ) shown.
  • the contacts 120 are shown in phantom in the top view shown.
  • each guide groove 130 is formed by two spaced-apart ribs 132 which run along the direction C on the housing wall 114 and perpendicular to the direction C of the housing wall 114, in particular normal to the lateral surface of the housing wall 114, protrude.
  • an isolation groove 134 is formed between each two adjacent guide grooves 130 .
  • the insulation grooves 134 and the guide grooves 132 are accordingly arranged alternately along the housing wall 114 (seen in the circumferential direction).
  • a depth of each isolation groove 134 may vary along the circumferential direction around the opening 112 .
  • outer isolation grooves 134a may have a greater depth than inner isolation grooves 134, e.g., middle isolation groove 134m in Fig. 1b .
  • a depth of the isolation groove 134 may be one azimuthal position of the isolation groove 134 along a circumferential direction of the opening 112 depend, as in FIG Fig. 1b is shown.
  • the at least one insulation groove can be provided as a recess in a rib, with the insulation groove being able to be introduced into a rib during production of the coil body, for example during production or subsequently, eg by removing or cutting out material from the rib .
  • a depth of the at least one isolation groove may be equal to or deeper than a depth of at least one guide groove.
  • a feedthrough can be further provided between a guide groove 134 and the interior of the housing body 110 by means of a slot 117 formed at the edge 113 of the opening 112 .
  • each of the slots 117 is formed at the edge 113 of the opening 112 with a depth that is substantially greater than a diameter of a lead wire 122 shown in FIG 1c is connected to at least one winding of a coil accommodated in the housing body 114 .
  • the Fig. 1a coil body 100 shown provided that the coil body is not to be attached to a printed circuit board (not shown) solely via the contacts 120, include further fastening means for fastening and/or orientation means for orienting the coil body 100 on a printed circuit board, such as snap hooks, clips, positioning pins, etc. , which protrude from a bottom of the bobbin 100 along the C direction.
  • a lid (not shown) may be provided to cover the opening 112 of the case body 110 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Insulating Of Coils (AREA)
  • Electromagnets (AREA)

Description

Die vorliegende Erfindung betrifft einen Spulenkörper für induktive Bauelemente, wie z.B. Transformatoren und Drosseln.The present invention relates to a bobbin for inductive components such as transformers and chokes.

Induktive Bauelemente, wie z.B. Drosseln und Transformatoren, werden in vielen technischen Gebieten eingesetzt, beispielsweise in der Automobilindustrie. Dort werden in Automobilelektroniken Leiterplattenbauteile eingesetzt, wie zum Beispiel in Leistungselektroniken, in denen sogenannte Impulstransformatoren oder Pulstransformatoren zur Steuerung des Gates eines elektronischen Schaltelements verwendet werden. Ein "Gate-Drive Transformator" stellt einen Pulstransformator dar, der das Timing von Leistungs-MOSFETs oder IGBTs in Schaltnetzteilen ("Switch-mode-power-supply" oder SMPS) steuert, wie beispielsweise in der Veröffentlichung "A guide to designing gate drive transformers", power electronics technology, 2007: 32 bis 36 , von Patrick Scoggins dargestellt ist.Inductive components such as chokes and transformers are used in many technical areas, for example in the automotive industry. There, printed circuit board components are used in automotive electronics, such as in power electronics, in which so-called pulse transformers or pulse transformers are used to control the gate of an electronic switching element. A "gate-drive transformer" represents a pulse transformer that controls the timing of power MOSFETs or IGBTs in switch-mode power supplies ("switch-mode-power-supply" or SMPS), such as in the Publication "A guide to designing gate drive transformers", power electronics technology, 2007: 32 to 36 , illustrated by Patrick Scoggins.

Für gewöhnlich weisen Gate-Drive-Transformatoren eine von einem Spulenkörper gehalterte Spule auf, die sowohl als oberflächenmontierbare (SMD-) Bauteile oder Durchsteckbauteile ausgebildet sein können. Hierbei sind, wie bei allgemeinen elektrischen und elektronischen Bauteilen, Sicherheitsstandards einzuhalten, die u.a. die Einhaltung von Isolations- und Kriechstrecken fordern. Die Vorgaben für Kriech- und Isolationsstrecken werden normalerweise dadurch eingehalten, dass die Spulenkörper in einem Gehäuse mit einer Vergussmasse vergossen sind.Gate drive transformers typically have a coil supported by a bobbin, which can be in the form of either surface mount (SMD) components or through-hole components. Here, as with general electrical and electronic components, safety standards must be observed which, among other things, require compliance with insulation and creepage distances. The specifications for creepage and insulation distances are normally met by encapsulating the bobbins in a housing with a casting compound.

Während der Bestückung von Leiterplatten mit induktiven Bauteilen werden Reflow-Lötprozesse durchgeführt, um u.a. induktive Bauteile mit Leiterplatten elektrisch und mechanisch zu verbinden. Hierbei treten während der Lötprozesse hohe Temperaturen auf, so dass ein Bauteil im Herstellungsprozess häufig Temperaturschwankungen von 100°C oder mehr ausgesetzt ist. Aufgrund der sich unterscheidenden Ausdehnungskoeffizienten zwischen den verschiedenen Materialien in induktiven Bauteilen, beispielsweise zwischen der Vergussmasse, dem Spulenkörper, dem Ferritkern und der Wicklung, treten folglich auch unterschiedliche thermische Ausdehnungen auf, die zu Spannungen im Material und letztlich zum Bruch führen. Häufig reißt beispielsweise die Vergussmasse, wodurch die Kriech- und Luftstrecken eines induktiven Bauteils stark herabgesetzt werden und die Normenanforderung nach IEC/UL usw. nicht mehr eingehalten werden kann.During the assembly of printed circuit boards with inductive components, reflow soldering processes are carried out in order, among other things, to connect inductive components to printed circuit boards electrically and mechanically. High temperatures occur during the soldering process, so that a component in the manufacturing process is often exposed to temperature fluctuations of 100°C or more. Due to the different expansion coefficients between the different materials in inductive components, for example between the potting compound, the bobbin, the ferrite core and the winding, different thermal expansions also occur, which lead to stresses in the material and ultimately to breakage. For example, the potting compound often tears, which greatly reduces the creepage and clearance distances of an inductive component and the standard requirements of IEC/UL etc. can no longer be met.

Im Betrieb kann ein Bauteil weiterhin Temperaturschwankungen ausgesetzt sein. Zum Beispiel sind Automobilelektroniken in der Nähe des Motors auch im Betrieb hohen Temperaturschwankungen von -40°C bis +155°C oder mehr ausgesetzt. Weiterhin unterliegen elektrische und elektronische Bauteile von Automobilelektroniken hohen mechanischen Belastungen aufgrund von Erschütterungen.During operation, a component can continue to be exposed to temperature fluctuations. For example, automotive electronics in the vicinity of the engine are also exposed to high temperature fluctuations during operation from -40°C to +155°C or more. Furthermore, electrical and electronic components of automotive electronics are subject to high mechanical loads due to vibrations.

Die Schrift JP 2009 272434 A zeigt eine Spulenkomponente mit einem durch Spulen bewickelten torusförmigen Kern, einem Basiselement mit einer Bodenfläche und Wandabschnitten und mit einem Aufnahmeabschnitt, in den der torusförmige Kern aufgenommen ist. Glieder, die an einer Befestigungsseite des Basiselements vorgesehen sind, und Rillenabschnitte, die an den Wandabschnitten ausgebildet sind und an die Endabschnitte der Spulen geführt sind. An dem Aufnahmeabschnitt ist der Ringkern mit seiner Mittelachse nahezu senkrecht zur Bodenfläche des Aufnahmeabschnitts montiert, wobei Nutabschnitte bis zur Tiefe der Bodenfläche des Aufnahmeabschnitts ausgebildet sind, und Anschlussabschnitte der Spulen jeweils fixiert sind, während sie zu jedem der Anschlusselemente gebündelt sind.The font JP 2009 272434 A shows a coil component having a toroidal core wound by coils, a base member having a bottom surface and wall portions, and having a receiving portion into which the toroidal core is received. links provided on a fixing side of the base member, and groove portions formed on the wall portions and guided to the end portions of the coils. On the accommodating portion, the toroidal core is mounted with its central axis nearly perpendicular to the bottom surface of the accommodating portion, groove portions are formed to the depth of the bottom surface of the accommodating portion, and terminal portions of the coils are respectively fixed while being bundled to each of the terminal members.

Aus der Schrift DE 10 2013 206453 A1 ist ein Gehäuse zur Aufnahme eines elektrischen Bauteils mit einem hohlen Gehäusekörper bekannt, das eine einseitig geöffneten Öffnung, die durch einen Boden unterhalb der Öffnung gebildet ist, einen Deckel oberhalb der Öffnung und zwei an die Öffnung angrenzende Seitenwände und mindestens zwei am Boden des Gehäuses vorgesehene elektrische Kontakte auf gegenüberliegenden Gehäuseseiten aufweist. Dabei befindet sich ein erster Kontakt der elektrischen Kontakte im Bereich der Öffnung befindet.From Scripture DE 10 2013 206453 A1 discloses a housing for accommodating an electrical component with a hollow housing body having an opening formed by a bottom below the opening, a lid above the opening and two side walls adjacent to the opening and at least two provided at the bottom of the housing having electrical contacts on opposite sides of the housing. A first contact of the electrical contacts is located in the area of the opening.

In der Schrift DE 28 25 152 B1 ist ein Ringkernübertrager mit Halterung bekannt, aus der achsparallele Anschlussstifte zum Einstecken in gedruckte Schaltungen herausragen, wobei der Ringkern mit mehreren Wicklungen versehen ist, die in mehreren auf dem Umfang verteilten Abschnitten räumlich fixiert angeordnet sind. Die Halterung des Ringkerns ist ein Topf, dessen Außendurchmesser angepasst ist und aus einem nichtleitenden und unmagnetischen Material gebildet ist. Die hohlzylinderförmige Wand des Topfes weist achsparallele, entlang dem Umfang verteilte Schlitze oder Nuten auf und der Boden des Topfes hat in der Mitte ein kreisrundes Loch, dessen Durchmesser etwa gleich dem Innendurchmesser des Ringkerns ist. Die Wicklungen des Ringkerns verlaufen in den Schlitzen oder Nuten und um das Bodenteil des Topfes herum und sind an die Anschlussstifte angelötet, so dass der Ringkern mittels der Wicklungen mit dem Topf mechanisch verbunden ist.In Scripture DE 28 25 152 B1 a toroidal transformer with holder is known, from which axis-parallel connecting pins protrude for plugging into printed circuits, the toroidal core being provided with a plurality of windings which are spatially fixed in a plurality of sections distributed over the circumference. The support of the toroidal core is a pot whose outer diameter is adjusted and is made of a non-conductive and non-magnetic material. The hollow-cylindrical wall of the pot has axially parallel slots or grooves distributed along the circumference, and the bottom of the pot has a circular hole in the middle, the diameter of which is approximately equal to the inner diameter of the toroidal core. The windings of the toroid run in the slots or grooves and around the bottom part of the pot and are soldered to the terminal pins so that the toroid is mechanically connected to the pot by the windings.

Die Schrift DE 23 28 227 A1 zeigt eine auf einen Spulenkörper gewickelte Spule, deren Wicklungsenden in Nuten angeordnet sind. Dabei befinden sich die Nuten auf einem zusätzlichen Nutenträger, der am Spulenkern oder am Spulenkörper befestigbar ist.The font DE 23 28 227 A1 shows a coil wound on a bobbin, the winding ends of which are arranged in slots. The grooves are located on an additional groove carrier that can be fastened to the coil core or the coil body.

Ausgehend von der oben dargestellten Situation soll ein Spulenkörper für ein induktives Bauelement bereitgestellt werden, bei dem die oben beschriebenen Nachteile ausgeräumt sind.Based on the situation presented above, a coil former for an inductive component is to be provided in which the disadvantages described above are eliminated.

Die vorliegende Erfindung stellt in verschiedenen Aspekten eine Lösung des oben genannten Problems bereit. Hierbei wird vorgeschlagen, die Vergussmasse durch entsprechend ausgelegte konstruktive Maßnahmen zu ersetzen. Dies wird erfindungsgemäß dadurch erreicht, dass die Kriechstrecken verlängert werden, so dass auf die Vergussmasse verzichtet werden kann.The present invention provides a solution to the above problem in various aspects. In this case, it is proposed to replace the casting compound with appropriately designed structural measures. According to the invention, this is achieved in that the creepage distances are lengthened, so that the casting compound can be dispensed with.

In einem Aspekt der Erfindung wird ein Spulenkörper mit einem hohlen Gehäusekörper bereitgestellt, der an einer ersten Seite eine Öffnung zur Aufnahme einer Spule in den Gehäusekörper entlang einer Einführrichtung und eine Gehäusewand aufweist, die sich zwischen einer ersten Seite des Gehäusekörpers und einer gegenüberliegenden zweiten Seite erstreckt. Der Gehäusekörper weist ferner mehrere elektrische Kontakte und eine Mehrzahl von entlang der Gehäusewand verlaufenden Führungsnuten auf, die jeweils zur Führung eines Anschlussdrahtes ausgebildet sind, um eine durch den Spulenkörper aufgenommene Spule mit den Kontakten zu verbinden, die an der zweiten Seite des Gehäuses angeordnet sind. Der Spulenkörper weist ferner am Rand der Öffnung gebildete Schlitze auf, die an der Öffnung in Umfangsrichtung angeordnet sind, so dass für jede Führungsnut eine definierte Durchführung in den Gehäusekörper hinein bzw. aus dem Gehäusekörper heraus bereitgestellt wird. Diese sind insbesondere im Bereich der Öffnung auf die Verlängerung von Kriechstrecken abgestimmt. Die Führungsnuten werden hierbei durch von der Gehäusewand abstehende und entlang der Einführrichtung parallel verlaufende Rippen gebildet. Hierbei bilden je zwei Rippen eine Führungsnut und die Rippen jeweils einer Führungsnut sind sämtlich von den Rippen einer anderen Führungsnut beabstandet, so dass zwischen zwei Führungsnuten jeweils eine Isolationsnut gebildet ist.In one aspect of the invention, a bobbin is provided with a hollow housing body having an opening on a first side for receiving a coil in the housing body along an insertion direction and a housing wall extending between a first side of the housing body and an opposite second side . The housing body also has a plurality of electrical contacts and a plurality of guide grooves running along the housing wall, each of which is designed to guide a connecting wire in order to connect a coil accommodated by the bobbin to the contacts which are arranged on the second side of the housing. The coil body also has slots formed at the edge of the opening, which are arranged at the opening in the circumferential direction, so that a defined passage into and out of the housing body is provided for each guide groove. In the area of the opening in particular, these are designed to extend creepage distances. The guide grooves are formed by ribs that protrude from the housing wall and run parallel along the direction of insertion. In this case, two ribs each form a guide groove and the ribs of one guide groove are all spaced apart from the ribs of another guide groove, so that an isolation groove is formed between each two guide grooves.

Es wird eine vorteilhafte Verlängerung von Kriechstrecken und Isolierstrecken im Spulenkörper erreicht, da zwischen zwei Führungsnuten eine Isolationsnut gebildet ist.An advantageous lengthening of creepage distances and insulation distances in the coil body is achieved since an insulation groove is formed between two guide grooves.

In einer weiteren anschaulichen Ausführungsform erstreckt sich wenigstens eine Führungsnut vollständig entlang der Gehäusewand.In a further illustrative embodiment, at least one guide groove extends completely along the housing wall.

In einer weiteren anschaulichen Ausführungsform ist der Gehäusekörper zur Aufnahme einer torusförmigen Spule ausgebildet.In a further illustrative embodiment, the housing body is designed to accommodate a toroidal coil.

Wie oben beschrieben sind die Führungsnuten durch Rippen gebildet, die von der Gehäusewand abstehen und entlang der Einführrichtung parallel verlaufen. Auf diese Art werden Führungsnuten zur effizienten Kriechstreckenverlängerung auf einfache Weise bereitgestellt.As described above, the guide grooves are formed by ribs that protrude from the housing wall and run parallel along the insertion direction. In this way, guide grooves for efficiently extending the creepage distance are provided in a simple manner.

Wie oben beschrieben bilden je zwei Rippen eine Führungsnut und die Rippen von jeweils einer Führungsnut sind sämtlich von den Rippen der anderen Führungsnuten beabstandet, so dass zwischen zwei Führungsnuten jeweils eine Isolationsnut gebildet wird. Dies stellt eine weitere vorteilhaftere Verlängerung von Kriechstrecken zwischen den in den Führungsnuten geführten Anschlussdrähten bereit.As described above, every two ribs form a guide groove and the ribs of each guide groove are all spaced apart from the ribs of the other guide grooves, so that an isolation groove is formed between each two guide grooves. This provides a further, more advantageous lengthening of creepage distances between the connecting wires guided in the guide grooves.

In einer weiteren vorteilhafteren Ausgestaltung hierin weisen die Isolationsnuten verschiedene Tiefen auf. In einigen Beispielen hierin wird die Spannungsfestigkeit weiter erhöht, dass die Isolationsnuten mit größerer Tiefe jeweils zwischen den Führungsnuten vorgesehen sind, in die die Anschlussdrähte eingelegt sind, die auf größerem Potential liegen. Somit kann eine kompaktere Auslegung des Spulenkörpers erreicht werden.In a further more advantageous embodiment herein, the isolation grooves have different depths. In some examples herein, the withstand voltage is further increased that the insulating grooves of greater depth are respectively provided between the guide grooves in which the lead wires having a greater potential are laid. A more compact design of the coil body can thus be achieved.

Weitere Vorteile und Merkmale der vorliegenden Erfindung gehen aus der nachfolgenden Beschreibung zusammen mit den beiliegenden Figuren hervor, in denen die

Fig. 1a bis 1c
einen Spulenkörper gemäß einem Aspekt der Erfindung in unterschiedlichen Ansichten schematisch darstellen.
Further advantages and features of the present invention emerge from the following description together with the accompanying figures, in which the
Figures 1a to 1c
schematically represent a bobbin according to an aspect of the invention in different views.

Fig. 1a zeigt schematisch eine perspektivische Ansicht eines Spulenkörpers, der einen hohlen Gehäusekörper 110 aufweist. Der Gehäusekörper 110 ist vorzugsweise zur Aufnahme einer torusförmigen Spule ausgebildet (Spule ist nicht dargestellt). Die Spule kann einen Magnetkern (nicht dargestellt) und wenigstens eine Wicklung (nicht dargestellt) umfassen. Alternativ kann die Spule ohne Magnetkern vorgesehen sein. Fig. 1a FIG. 12 schematically shows a perspective view of a bobbin having a hollow housing body 110. FIG. The housing body 110 is preferably designed to receive a toroidal coil (coil not shown). The coil may include a magnetic core (not shown) and at least one winding (not shown). Alternatively, the coil can be provided without a magnetic core.

Gemäß der Darstellung Fig. 1a weist der Gehäusekörper 110 eine Öffnung 112 an einer ersten Seite A des Gehäusekörpers 110 auf, so dass eine Spule (nicht dargestellt) entlang einer in Fig. 1a mit dem Bezugszeichen "C" bezeichneten Richtung in den Gehäusekörper 110 eingeführt werden kann. Vorzugsweise ist der Gehäusekörper 110 an einer der ersten Seite A gegenüber liegenden zweiten Seite B verschlossen. Das heißt, dass im Gehäusekörper ein Boden 115 vorgesehen ist, der als Auflagefläche für eine in den Gehäusekörper aufgenommene Spule (nicht dargestellt) dient. Zwischen der ersten Seite A und der zweiten Seite B erstreckt sich eine Gehäusewand 114, so dass eine in den Gehäusekörper 110 aufgenommene Spule durch den Boden 115 und die Gehäusewand 114 umgeben wird.According to the representation Fig. 1a the housing body 110 has an opening 112 on a first side A of the housing body 110, so that a coil (not shown) along an in Fig. 1a can be inserted into the case body 110 in the direction denoted by the reference character "C". The housing body 110 is preferably closed on a second side B opposite the first side A. This means that a base 115 is provided in the housing body, which serves as a support surface for a coil (not shown) accommodated in the housing body. A housing wall 114 extends between the first side A and the second side B, so that a coil accommodated in the housing body 110 is surrounded by the bottom 115 and the housing wall 114 .

In der Gehäusewand 114 sind zwischen der ersten Seite A und der zweiten Seite B parallel zur Richtung C verlaufende Führungsnuten 130 gebildet. Die Führungsnuten 130 erstrecken sich vorzugsweise vollständig entlang der Gehäusewand zwischen der ersten Seite A und der zweiten Seite B des Gehäusekörpers 110. Jede der Führungsnuten 130 ist vorzugsweise zur vollständigen Aufnahme eines Anschlussdrahtes ausgebildet, d.h., eine Tiefe von jeder Führungsnut 130 ist größer oder gleich einem Durchmesser des Anschlussdrahtes (nicht dargestellt). Wie in Fig. 1a dargestellt, ist an der zweiten Seite B eine Mehrzahl von Kontakten 120 angebracht. Die Mehrzahl von Kontakten dient zur elektrischen und mechanischen Befestigung des Spulenkörpers 100 an einer Leiterplatte (nicht dargestellt). Dazu kann wenigstens ein Kontakt 120 zu einer elektrischen und/oder mechanischen Verbindung zwischen Leiterplatte (nicht dargestellt) und Spulenkörper 100 vorgesehen sein. Die Kontakte 120 können gemäß einer Ausführungsform L-förmig ausgebildet sein und von dem Gehäusekörper 110 entlang der Richtung C nach unten abstehen. Ein freiliegendes Ende des wenigstens einen Kontakts 120 ist demzufolge vorzugsweise entlang einer Richtung senkrecht zur Richtung C gebogen. Auf diese Weise wird ein SMD-Bauteil bereitgestellt. Alternativ erstrecken sich die freiliegenden Enden der Kontakte 120 im Wesentlichen entlang einer Richtung parallel zur Richtung C, so dass die Kontakte 120 als Durchsteckkontakt ausgebildet sind.Guide grooves 130 running parallel to direction C are formed in the housing wall 114 between the first side A and the second side B. The guide grooves 130 preferably extend entirely along the housing wall between the first side A and the second side B of the housing body 110. Each of the guide grooves 130 is preferably configured to fully receive a lead wire, ie, a depth of each guide groove 130 is greater than or equal to one Connection wire diameter (not shown). As in Fig. 1a As shown, the second side B has a plurality of contacts 120 attached thereto. The plurality of contacts is used to electrically and mechanically attach coil body 100 to a printed circuit board (not shown). For this purpose, at least one contact 120 for an electrical and/or mechanical connection between the printed circuit board (not shown) and coil body 100 can be provided. According to one embodiment, the contacts 120 can be L-shaped and protrude downwards from the housing body 110 along the direction C. FIG. Accordingly, an exposed end of the at least one contact 120 is preferably bent along a direction perpendicular to the C direction. In this way, an SMD component is provided. Alternatively, the exposed ends of the contacts 120 extend substantially along a direction parallel to direction C such that the contacts 120 are formed as a through-hole contact.

Mit Bezug auf Fig. 1b ist eine Aufsicht auf den Gehäusekörper 110 (entlang der Richtung C in Fig. 1a) dargestellt. Die Kontakte 120 sind in der dargestellten Aufsicht strichpunktiert dargestellt. Wie aus der Darstellung in den Fig. 1a und 1b hervorgeht, wird jede Führungsnut 130 durch zwei mit Abstand zueinander angeordnete Rippen 132 gebildet, die entlang der Richtung C an der Gehäusewand 114 verlaufen und senkrecht zur Richtung C von der Gehäusewand 114, insbesondere normal zur Manteloberfläche der Gehäusewand 114, abstehen.Regarding Fig. 1b 12 is a plan view of the case body 110 (taken along the direction C in Fig. 1a ) shown. The contacts 120 are shown in phantom in the top view shown. As can be seen from the illustration in the Figures 1a and 1b shows, each guide groove 130 is formed by two spaced-apart ribs 132 which run along the direction C on the housing wall 114 and perpendicular to the direction C of the housing wall 114, in particular normal to the lateral surface of the housing wall 114, protrude.

Erfindungsgemäß ist zwischen je zwei benachbarten Führungsnuten 130 eine Isolationsnut 134 gebildet. Die Isolationsnuten 134 und die Führungsnuten 132 sind demnach abwechselnd entlang der Gehäusewand 114 (in Umfangsrichtung gesehen) angeordnet. Wie aus der Aufsicht in Fig. 1b hervorgeht, kann eine Tiefe jeder Isolationsnut 134 entlang der Umfangsrichtung um die Öffnung 112 variieren. Zum Beispiel können äußere Isolationsnuten 134a eine größere Tiefe aufweisen als innere Isolationsnuten 134, z.B. die mittlere Isolationsnut 134m in Fig. 1b. Sind nun in den äußeren Führungsnuten Anschlussdrähte verlegt, an denen eine größere Potentialdifferenz anliegt, so wird mittels den zwischen diesen Führungsnuten ausgebildeten Isolationsnuten mit vergleichsweise größerer Tiefe auch eine vergleichsweise größere Isolationsstrecke bereitgestellt, als dies z.B. bei zentraleren Führungsnuten der Fall ist. Gemäß einem anschaulichen Beispiel hierin kann eine Tiefe der Isolationsnut 134 von einer azimutalen Lage der Isolationsnut 134 entlang einer Umfangsrichtung der Öffnung 112 abhängen, wie in Fig. 1b dargestellt ist.According to the invention, an isolation groove 134 is formed between each two adjacent guide grooves 130 . The insulation grooves 134 and the guide grooves 132 are accordingly arranged alternately along the housing wall 114 (seen in the circumferential direction). As from the supervision in Fig. 1b As shown, a depth of each isolation groove 134 may vary along the circumferential direction around the opening 112 . For example, outer isolation grooves 134a may have a greater depth than inner isolation grooves 134, e.g., middle isolation groove 134m in Fig. 1b . If connecting wires with a greater potential difference are laid in the outer guide grooves, the insulation grooves formed between these guide grooves with a comparatively greater depth also provide a comparatively greater insulation distance than is the case, for example, with more central guide grooves. According to an illustrative example herein, a depth of the isolation groove 134 may be one azimuthal position of the isolation groove 134 along a circumferential direction of the opening 112 depend, as in FIG Fig. 1b is shown.

In einer beispielhaften Ausführungsform kann die wenigstens eine Isolationsnut als eine Ausnehmung in einer Rippe vorgesehen sein, wobei die Isolationsnut bei der Herstellung des Spulenkörpers, beispielsweise während der Herstellung oder nachträglich, in eine Rippe eingebracht werden kann, z.B. durch Ausnehmen oder Aussparen von Material der Rippe. In einem speziellen Beispiel kann eine Tiefe der wenigstens einen Isolationsnut gleich oder tiefer sein als eine Tiefe von wenigstens einer Führungsnut.In an exemplary embodiment, the at least one insulation groove can be provided as a recess in a rib, with the insulation groove being able to be introduced into a rib during production of the coil body, for example during production or subsequently, eg by removing or cutting out material from the rib . In a specific example, a depth of the at least one isolation groove may be equal to or deeper than a depth of at least one guide groove.

Es wird auf Fig. 1a und Fig. 1c Bezug genommen. Dabei zeigt Fig. 1c eine ebene Seitenansicht des Spulenkörpers 100 aus Fig. 1a senkrecht zur Richtung C. Darstellungsgemäß kann zwischen einer Führungsnut 134 und dem Inneren des Gehäusekörpers 110 weiterhin mittels eines Schlitzes 117, der am Rand 113 der Öffnung 112 gebildet ist, eine Durchführung bereitgestellt werden. In einigen anschaulichen Beispielen hierin ist jeder der Schlitze 117 am Rand 113 der Öffnung 112 mit einer Tiefe ausgebildet, die im Wesentlichen größer ist als ein Durchmesser eines Anschlussdrahts 122, der in der Darstellung von Fig. 1c mit wenigstens einer Wicklung einer in den Gehäusekörper 114 aufgenommenen Spule verbunden ist. Dadurch wird bei der Führung des Anschlussdrahts aus dem Inneren des Gehäusekörpers 110 heraus zur Außenseite des Gehäusekörpers 110 eine vorteilhafte Spannungsfestigkeit vorgesehen.It will be on Fig. 1a and 1c referenced. while showing 1c a plan side view of the bobbin 100 from Fig. 1a perpendicular to the direction C. As shown, a feedthrough can be further provided between a guide groove 134 and the interior of the housing body 110 by means of a slot 117 formed at the edge 113 of the opening 112 . In some illustrative examples herein, each of the slots 117 is formed at the edge 113 of the opening 112 with a depth that is substantially greater than a diameter of a lead wire 122 shown in FIG 1c is connected to at least one winding of a coil accommodated in the housing body 114 . As a result, an advantageous dielectric strength is provided when the connecting wire is routed from the inside of the housing body 110 to the outside of the housing body 110 .

Gemäß einigen nicht dargestellten Ausführungsformen kann der in Fig. 1a dargestellte Spulenkörper 100, sofern der Spulenkörper nicht allein über die Kontakte 120 an einer Leiterplatte (nicht dargestellt) anzubringen ist, weitere Befestigungsmittel zur Befestigung und/oder Orientierungsmittel zur Orientierung des Spulenkörpers 100 auf einer Leiterplatte umfassen, wie z.B. Schnapphaken, Clips, Positionierstifte usw., die von einer Unterseite des Spulenkörpers 100 entlang der Richtung C abstehen. Ferner kann ein Deckel (nicht dargestellt) vorgesehen sein, um die Öffnung 112 des Gehäusekörpers 110 abzudecken.According to some embodiments that are not shown, the Fig. 1a coil body 100 shown, provided that the coil body is not to be attached to a printed circuit board (not shown) solely via the contacts 120, include further fastening means for fastening and/or orientation means for orienting the coil body 100 on a printed circuit board, such as snap hooks, clips, positioning pins, etc. , which protrude from a bottom of the bobbin 100 along the C direction. Furthermore, a lid (not shown) may be provided to cover the opening 112 of the case body 110 .

Claims (5)

  1. A coil former (100) comprising:
    a hollow housing body (110) having an opening (112) at a first side (A) for inserting a coil into the housing body (110) along an insertion direction (C), and a housing wall (114) extending between the first side (A) of the housing body (110) and an opposite second side (B) of the housing body (110),
    a plurality of electrical contacts (120) and a plurality of guide grooves (130) extending along the housing wall (114), each being configured to guide a lead wire to connect a coil received in the housing body (110) to the contacts (120), and wherein the guide grooves (130) are formed by ribs (132) projecting from the housing wall (114) and extending parallel to each other along the insertion direction (C), wherein the contacts (120) are attached to the housing body (110) at the second side (B),
    wherein the coil former (100) further includes slots (117) formed at the edge (113) of the opening (112) and arranged at the opening (112) in the circumferential direction, so that for each guide groove (130) a passage into the housing body (110) and out of the housing body (110) is respectively provided, and
    wherein two ribs (132) each form a guide groove (130),
    characterized in that the ribs (132) of a respective guide groove (130) are each spaced from the ribs (132) of the other guide grooves (130) so that between each two guide grooves (130) a respective insulation groove (134) is formed.
  2. The coil former (100) according to claim 1, wherein at least one guide groove extends (130) along the entire housing wall (114).
  3. The coil former (100) according to claim 1 or 2, wherein the housing body (110) is configured to receive a toroidal coil.
  4. The coil former (100) according to any one of claims 1 to 3, wherein the insulation grooves (134) have different depths.
  5. The coil former (100) according to any one of claims 1 to 4, wherein a depth of at least one guide groove (130) is equal to or less than a depth of the at least one isolation groove (134).
EP16179542.2A 2015-07-17 2016-07-14 Coil body Active EP3128522B1 (en)

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DE102015213499.7A DE102015213499A1 (en) 2015-07-17 2015-07-17 bobbins

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US20200203061A1 (en) 2020-06-25
EP3128522A3 (en) 2017-03-22
EP3128522A2 (en) 2017-02-08
US10607760B2 (en) 2020-03-31
DE102015213499A1 (en) 2017-01-19
US20170018347A1 (en) 2017-01-19

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