EP2462596A1 - Current compensated inductor and method for producing a current compensated inductor - Google Patents

Current compensated inductor and method for producing a current compensated inductor

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Publication number
EP2462596A1
EP2462596A1 EP10739571A EP10739571A EP2462596A1 EP 2462596 A1 EP2462596 A1 EP 2462596A1 EP 10739571 A EP10739571 A EP 10739571A EP 10739571 A EP10739571 A EP 10739571A EP 2462596 A1 EP2462596 A1 EP 2462596A1
Authority
EP
European Patent Office
Prior art keywords
ferrite core
current
wire
compensated
compensated choke
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP10739571A
Other languages
German (de)
French (fr)
Other versions
EP2462596B1 (en
Inventor
Bernhard Röllgen
Karl Stoll
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TDK Electronics AG
Original Assignee
Epcos AG
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 Epcos AG filed Critical Epcos AG
Publication of EP2462596A1 publication Critical patent/EP2462596A1/en
Application granted granted Critical
Publication of EP2462596B1 publication Critical patent/EP2462596B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/06—Coil winding
    • H01F41/08—Winding conductors onto closed formers or cores, e.g. threading conductors through toroidal cores
    • 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
    • H01F27/2847—Sheets; Strips
    • 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
    • H01F27/2895—Windings disposed upon ring cores

Definitions

  • the task is to specify a current-compensated choke, which has a high current carrying capacity.
  • a current-compensated choke according to claim 1 Furthermore, a method for producing a current-compensated choke according to claim 9 is given.
  • Advantageous embodiments of the current-compensated throttle and the method for producing a current-compensated throttle are the subject of
  • a current-compensated choke which has a one-piece, annularly closed ferrite core.
  • the ferrite core has at least two wire coils, each comprising a flat wire wound upright.
  • the wire coils are bobbin-free and spaced from each other on the ferrite core.
  • a one-piece ring-shaped closed ferrite core is understood as meaning a "single-layer" ferrite core with a homogeneous construction and without an air gap.
  • Ferrite core has in comparison to a current-compensated choke with a multi-part ferrite core with air gap approximately the same number of turns of the winding to a comparatively higher inductance.
  • a current-compensated reactor having a ferrite core made of a single piece Compared to a current-compensated reactor having a ferrite core made of a single piece, a current-compensated reactor having a ferrite core of bonded ferrite core halves has only about 20 to 50% of the inductance.
  • the wire coils of the current-compensated choke each have a flat wire, which is formed edgewise to a winding. Compared with a round wire whose diameter corresponds to the width of the flat wire, the flat wire has a higher cross section than the round wire.
  • Cross-section of flat wire and round wire can be applied with the flat wire per winding layer more turns than with a round wire.
  • windings made of flat wire with a comparable number of turns have a lower one due to the high degree of filling
  • the individual turns of the wire winding are in this case constructed such that the long sides of the
  • the skin effect is also significantly more pronounced in flat-wire coils than, for example, in wire-wounds Stranded wires, which also leads to high-frequency losses in the desired manner for the throttle.
  • the wire coils are arranged on the ferrite core so that they have the largest possible
  • they are arranged on mutually parallel portions of the ferrite core.
  • the ferrite core has a rectangular shape.
  • the wire coils are in one
  • Embodiment arranged on the shorter legs of the ferrite core. If the windings are each arranged on the shorter legs, this results in a spatially greater distance between the wire windings than when arranged on the longer legs of the rectangular ferrite core.
  • the ferrite core has a toroidal shape.
  • the ferrite core is preferred as
  • the wire coils are preferably arranged in the sections of the torus which have the greatest possible distance from each other.
  • the current-compensated choke with a rectangular or toroidal ferrite core thus a spatially large distance of the two wire coils can be achieved. This causes, despite a one-piece ferrite core about 2% of the main inductance occur as a leakage inductance.
  • the stray inductance works effectively as an additional one Reactor and attenuates differential mode noise. Rectangular shaped ferrite cores are particularly effective.
  • the wire coils each have only one layer. It is also possible, however, several layers
  • An ideal current-compensated choke preferably has a high resonant frequency of the wire coils. To increase the resonance frequency, it is advantageous if the parasitic capacitances are reduced. Due to the single-layer structure of the wire coils of the previously described current-compensated choke, the wire coils have the virtually smallest possible parasitic capacitance, because it is a
  • Flat wire winding preferably has a bobbin-free construction of the wire wound on. Each turn of the wire coil corresponds to a chamber.
  • the wire coils are thus not limited to a predetermined number of physical chambers by a bobbin.
  • the wire coils are such
  • Connection - have a mutually opposite winding sense.
  • the wire coils preferably have the same number of turns.
  • the ferrite core has an electrically insulating coating.
  • the coating fulfills the fire protection class UL94V-0.
  • the current-compensated choke is arranged with a preferably uncoated ferrite core in a plastic housing.
  • the winding is then arranged on this housing.
  • the housing preferably causes the same electrical insulation as an insulating
  • the housing has devices for fixing the wire ends of the current-compensated throttle.
  • a circuit arrangement with a previously described current-compensated choke is specified, wherein the current-compensated choke is connected in series to a bridge rectifier. judge is switched.
  • the current-compensated choke is in the network of an application circuit eg behind the
  • the current-compensated choke is connected such that the magnetic flux generated in the first coil is oppositely directed to the magnetic flux generated in the second coil and thus both fluxes compensate each other.
  • a method of manufacturing a current-compensated choke is provided wherein a flat wire is spirally formed into a wire coil.
  • annularly closed ferrite core applied such that the individual turns of the wire winding are turned on successively, by relative rotation between the wire coil and ferrite core on the ferrite core.
  • Bewicklungsvorgangs may preferably be chamfered all edges of the ferrite core, that is, the edges are chamfered or rounded.
  • the wire coil is preferably applied in one layer to the ferrite core. It is also possible to apply two wraps one above the other and connect them electrically in parallel. at suitable diameter, the two windings can also be turned on one another with the method.
  • Winding direction is applied to the ferrite core.
  • the second wire coil is preferably on the
  • Ferrite core applied so that the spatial distance between the two wire coils is as large as possible.
  • Screw The method described above is particularly suitable for edgewise wound flat wire wraps.
  • Wire wraps are sufficient, for example, a few drops of an example, UV-curing adhesive.
  • support plates are advantageous, they can also be combined with the above-described current-compensated inductor.
  • Low-resistance wire coils of flat wire, which are arranged on a one-piece ferrite core is the
  • the rated current depends on the thermally possible and of the maximum current due to the saturation of the ferrite core.
  • a current-compensated choke described above has one
  • the choke a rectangular ferrite core with two wire coils with an inductance of 1 mH
  • the current-compensated reactor can be controlled, for example, up to approximately 5 A (peak current).
  • the stray inductance of the current-compensated choke is approximately 37% higher than that of a choke on toroidal base.
  • Figure 1 shows a first embodiment of the current-compensated
  • FIG. 2 shows the profile of the saturation of a ferrite core of a current-compensated choke as a function of the nominal current
  • FIG. 3 shows the flux density distribution of an embodiment
  • a current-compensated choke 4 shows a circuit diagram of an application circuit with a current-compensated choke
  • FIG. 5 the winding of a closed ferrite core with a preformed wire coil
  • FIG. 6 shows another embodiment of the current-compensated
  • FIG. 1 shows a first embodiment of the invention
  • the ferrite core 2 has two wire coils 4, 5 disposed on opposite sides of the ferrite core 2.
  • the ferrite core has the shape of a ring torus.
  • Figure 2 shows the curve 10 of the relative inductance L / L Q as a function of the current I.
  • the current I is plotted in amperes.
  • the relative inductance is in percent
  • a current-compensated choke according to the invention has a relative inductance of approximately 90% at a current intensity of approximately 5.5 A. At 9A, the current compensated choke still has a relative inductance of 60%.
  • FIG. 3 shows the flux density distribution in the ferrite core of a current-compensated choke when supplied with nominal current. in the Area of the wire coils 54 and 55 occurs a maximum of
  • FIG. 4 schematically shows a current-compensated choke in a circuit diagram of an application circuit.
  • Bridge rectifier 11 is connected. The construction of the
  • Circuit corresponds approximately to a line filter circuit.
  • Bridge rectifier 11 occurs a current flow through the two windings of the current-compensated inductor 1 only in one direction. This will make the ferrite core the
  • FIG. 5 shows the winding of a closed, rectangular ferrite core 62 with a wire winding 65.
  • a first one is already present on the ferrite core 62
  • the second wire coil 65 is approximately halfway on the ferrite core 62 in the figure
  • the preformed wire coil 65 is applied in the stretched state by rotation on the ferrite core 62.
  • the individual turns of the wire coil 65 are here by a relative rotation between
  • the wire winding 65 and the ferrite core 62 are "screwed" onto the ferrite core 62.
  • the ferrite core 62 has a closed shape.
  • FIG. 6 shows a further embodiment of the

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)

Abstract

The invention relates to a current compensated inductor comprising a single piece annularly closed ferrite core (2). The ferrite core (2) comprises at least two wire coils (4, 5) each comprising a flat wire wound on edge and disposed, for example, without a coil bobbin and at a distance from each other on the ferrite core (2).

Description

Beschreibung description
Stromkompensierte Drossel und Verfahren zur Herstellung einer stromkompensierten Drossel Current-compensated choke and method for producing a current-compensated choke
Aus der Druckschrift DE 102004008961 B4 ist eine From the document DE 102004008961 B4 is a
stromkompensierte Drossel bekannt. current-compensated choke known.
Aufgabe ist es, eine stromkompensierte Drossel anzugeben, die eine hohe Stromtragfähigkeit aufweist. The task is to specify a current-compensated choke, which has a high current carrying capacity.
Die Aufgabe wird durch eine stromkompensierte Drossel nach Patentanspruch 1 gelöst. Des Weiteren wird ein Verfahren zur Herstellung einer stromkompensierten Drossel nach Anspruch 9 angegeben. Vorteilhafte Ausgestaltungen der stromkompensierten Drossel und des Verfahrens zur Herstellung einer stromkompensierten Drossel sind Gegenstand von The object is achieved by a current-compensated choke according to claim 1. Furthermore, a method for producing a current-compensated choke according to claim 9 is given. Advantageous embodiments of the current-compensated throttle and the method for producing a current-compensated throttle are the subject of
Unteransprüchen . Es wird eine stromkompensierte Drossel angegeben, die einen einstückigen, ringförmig geschlossenen Ferritkern aufweist. Der Ferritkern weist wenigstens zwei Drahtwickel auf, die jeweils einen hochkant gewickelten Flachdraht umfassen. Die Drahtwickel sind spulenkörperfrei und voneinander beabstandet auf dem Ferritkern angeordnet. Subclaims. A current-compensated choke is given, which has a one-piece, annularly closed ferrite core. The ferrite core has at least two wire coils, each comprising a flat wire wound upright. The wire coils are bobbin-free and spaced from each other on the ferrite core.
Unter einem einstückigen ringförmig geschlossenen Ferritkern wird ein „einlagiger" Ferritkern mit homogenem Aufbau und ohne Luftspalt verstanden. Ringförmig geschlossen bedeutet dabei eine beliebige Fläche einschließend. A one-piece ring-shaped closed ferrite core is understood as meaning a "single-layer" ferrite core with a homogeneous construction and without an air gap.
Eine stromkompensierte Drossel mit einem einstückigen A current-compensated choke with a one-piece
Ferritkern weist im Vergleich zu einer stromkompensierten Drossel mit einem mehrteiligen Ferritkern mit Luftspalt bei etwa gleicher Windungszahl der Wickel eine vergleichsweise höhere Induktivität auf. Ferrite core has in comparison to a current-compensated choke with a multi-part ferrite core with air gap approximately the same number of turns of the winding to a comparatively higher inductance.
Im Vergleich zu einer stromkompensierten Drossel mit einem Ferritkern, der aus einem einzigen Stück besteht, weist eine stromkompensierte Drossel mit einem Ferritkern aus verklebten Ferritkernhälften nur zirka 20 bis 50 % der Induktivität auf. Compared to a current-compensated reactor having a ferrite core made of a single piece, a current-compensated reactor having a ferrite core of bonded ferrite core halves has only about 20 to 50% of the inductance.
Die Drahtwickel der stromkompensierten Drossel weisen jeweils einen Flachdraht auf, der hochkant zu einem Wickel geformt ist. Verglichen mit einem Runddraht, dessen Durchmesser der Breite des Flachdrahts entspricht, hat der Flachdraht einen höheren Querschnitt als der Runddraht. Bei gleichem The wire coils of the current-compensated choke each have a flat wire, which is formed edgewise to a winding. Compared with a round wire whose diameter corresponds to the width of the flat wire, the flat wire has a higher cross section than the round wire. At the same
Querschnitt von Flachdraht und Runddraht lassen sich mit dem Flachdraht pro Wicklungslage mehr Windungen aufbringen als mit einem Runddraht. Im Vergleich zu Wickeln aus Runddraht weisen Wickel aus Flachdraht mit vergleichbarer Windungszahl aufgrund des hohen Füllgrades einen geringeren Cross-section of flat wire and round wire can be applied with the flat wire per winding layer more turns than with a round wire. In comparison with winding from round wire, windings made of flat wire with a comparable number of turns have a lower one due to the high degree of filling
Gleichspannungs-Widerstand auf, wodurch die stromkompensierte Drossel sich bei gleicher Strombelastung weniger stark erwärmt. Die einzelnen Windungen des Drahtwickels sind hierbei derart aufgebaut, dass die langen Seiten des DC resistance, whereby the current-compensated throttle heats less at the same current load. The individual turns of the wire winding are in this case constructed such that the long sides of the
Flachdrahts zueinander weisen. Durch einen derartigen Aufbau des hochkant gewickelten Drahtwickels weist dieser mit nur wenigen Windungen eine große wirksame Fläche auf. Point flat wire to each other. By such a structure of the edgewise wound wire winding this has a large effective area with only a few turns.
Durch die große wirksame Fläche der Flachdrahtwickel bauen sich in den Drahtwickeln bei hohen Frequenzen Wirbelströme auf. Die Wirbelströme bewirken eine gewünschte Erhöhung des Serienwiderstands der Drahtwickel (Proximityeffekt) bei hohen Frequenzen . Due to the large effective area of the flat wire windings, eddy currents build up in the wire windings at high frequencies. The eddy currents cause a desired increase in the series resistance of the wire coils (proximity effect) at high frequencies.
Auch der Skineffekt ist bei Flachdrahtwickeln signifikant stärker ausgeprägt als beispielsweise bei Drahtwickeln aus Litzendrähten, was ebenfalls in für die Drossel erwünschter Weise zu Hochfrequenzverlusten führt. The skin effect is also significantly more pronounced in flat-wire coils than, for example, in wire-wounds Stranded wires, which also leads to high-frequency losses in the desired manner for the throttle.
In einer Ausführungsform sind die Drahtwickel derart auf dem Ferritkern angeordnet, dass sie einen größtmöglichen In one embodiment, the wire coils are arranged on the ferrite core so that they have the largest possible
räumlichen Abstand zueinander aufweisen. have spatial distance from each other.
Vorzugsweise sind sie auf zueinander parallelen Abschnitten des Ferritkerns angeordnet. Preferably, they are arranged on mutually parallel portions of the ferrite core.
In einer Ausführungsform weist der Ferritkern daher eine rechteckige Form auf. Die Drahtwickel sind in einer In one embodiment, therefore, the ferrite core has a rectangular shape. The wire coils are in one
Ausführungsform an den kürzeren Schenkeln des Ferritkerns angeordnet. Werden die Wicklungen jeweils auf den kürzeren Schenkeln angeordnet, so wird dadurch ein räumlich größerer Abstand zwischen den Drahtwickeln erreicht als bei Anordnung an den längeren Schenkeln des rechteckigen Ferritkerns. Embodiment arranged on the shorter legs of the ferrite core. If the windings are each arranged on the shorter legs, this results in a spatially greater distance between the wire windings than when arranged on the longer legs of the rectangular ferrite core.
In einer weiteren Ausführungsform weist der Ferritkern eine toroidale Form auf. Der Ferritkern ist bevorzugt als In a further embodiment, the ferrite core has a toroidal shape. The ferrite core is preferred as
Ringtorus ausgebildet, wobei die Öffnung des Torus eine  Ringtorus formed, with the opening of the torus a
Grundfläche aufweist, die entweder einem Kreis oder einer Ellipse entspricht. Bei einem Ringtorus mit einer ellipsoiden Grundfläche der Öffnung sind die Drahtwickel vorzugsweise in den Abschnitten des Torus angeordnet, die einen räumlich größtmöglichen Abstand zueinander aufweisen. Has footprint that corresponds to either a circle or an ellipse. In the case of a ring torus having an ellipsoidal base surface of the opening, the wire coils are preferably arranged in the sections of the torus which have the greatest possible distance from each other.
Bei einer Ausführungsform der stromkompensierten Drossel mit einem rechteckigen oder toroidalen Ferritkern kann somit ein räumlich großer Abstand der zwei Drahtwickel erreicht werden. Dieser bewirkt, dass trotz eines einteiligen Ferritkerns etwa 2 % der Hauptinduktivität als Streuinduktivität auftreten. Die Streuinduktivität wirkt effektiv wie eine zusätzliche Drosselspule und dämpft Gegentaktstörungen . Rechteckig geformte Ferritkerne sind hierbei besonders wirkungsvoll. In one embodiment, the current-compensated choke with a rectangular or toroidal ferrite core thus a spatially large distance of the two wire coils can be achieved. This causes, despite a one-piece ferrite core about 2% of the main inductance occur as a leakage inductance. The stray inductance works effectively as an additional one Reactor and attenuates differential mode noise. Rectangular shaped ferrite cores are particularly effective.
In einer Ausführungsform weisen die Drahtwickel jeweils nur eine Lage auf. Möglich ist jedoch auch, mehrere Lagen In one embodiment, the wire coils each have only one layer. It is also possible, however, several layers
übereinander vorzusehen und diese bevorzugt elektrisch parallel zu verschalten. provide one above the other and these preferably interconnect electrically in parallel.
Eine ideale stromkompensierte Drossel weist vorzugsweise eine hohe Resonanzfrequenz der Drahtwickel auf. Zur Erhöhung der Resonanzfrequenz ist es von Vorteil, wenn die parasitären Kapazitäten verringert werden. Durch den einlagigen Aufbau der Drahtwickel der zuvor beschriebenen stromkompensierten Drossel weisen die Drahtwickel die praktisch kleinstmögliche parasitäre Kapazität auf, denn es handelt sich um eine An ideal current-compensated choke preferably has a high resonant frequency of the wire coils. To increase the resonance frequency, it is advantageous if the parasitic capacitances are reduced. Due to the single-layer structure of the wire coils of the previously described current-compensated choke, the wire coils have the virtually smallest possible parasitic capacitance, because it is a
Reihenschaltung von parasitären Kapazitäten, die hier von je einer Windung mit der benachbarten Windung gebildet werden.  Series connection of parasitic capacitances, which are formed here by one turn with the adjacent winding.
Zur Verringerung der parasitären Kapazität eines To reduce the parasitic capacity of a
herkömmlichen mehrlagigen Drahtwickels ist es von Vorteil, wenn der Drahtwickel in einzelne Kammern unterteilt ist. Bei herkömmlichen stromkompensierten Drosseln wird die conventional multi-layer wire winding, it is advantageous if the wire coil is divided into individual chambers. In conventional current-compensated chokes, the
Unterteilung in Kammern durch entsprechende Trennwände zwischen den Wicklungen am Spulenkörper erreicht. Dies reduziert jedoch den für die Wicklungen selbst zur Verfügung stehenden Raum. Dieses Problem verstärkt sich mit zunehmender Anzahl an Kammern. Division into chambers achieved by appropriate partitions between the windings on the bobbin. However, this reduces the space available for the windings themselves. This problem increases as the number of chambers increases.
Die zuvor beschriebene stromkompensierte Drossel mit The previously described current-compensated choke with
Flachdrahtwickeln weist vorzugsweise einen spulenkörperfreien Aufbau der Drahtwickel auf. Jede Windung des Drahtwickels entspricht hierbei einer Kammer. Die Drahtwickel sind somit nicht auf eine durch einen Spulenkörper vorgegebene Anzahl von physikalischen Kammern beschränkt. Durch den Aufbau der stromkompensierten Drossel mit einem einstückigen Ferritkern und der Verwendung von einlagigen Flachdrahtwickeln wird eine Reduzierung des DC-Widerstands und der parasitären Kapazität der Drossel erreicht. Die gewünschten Hochfrequenzverluste können durch diesen Aufbau der Drossel hingegen maximiert werden. Flat wire winding preferably has a bobbin-free construction of the wire wound on. Each turn of the wire coil corresponds to a chamber. The wire coils are thus not limited to a predetermined number of physical chambers by a bobbin. By constructing the current-compensated reactor with a one-piece ferrite core and using single-layered flat wire coils, a reduction of the DC resistance and the parasitic capacitance of the reactor is achieved. The desired high-frequency losses, however, can be maximized by this structure of the throttle.
In einer Ausführungsform sind die Drahtwickel derart In one embodiment, the wire coils are such
angeordnet, dass sie - bei symmetrischer elektrischer arranged that they - with symmetrical electric
Anbindung - einen zueinander gegenläufigen Wickelsinn aufweisen. Die Drahtwickel weisen vorzugsweise die gleiche Anzahl von Windungen auf. Connection - have a mutually opposite winding sense. The wire coils preferably have the same number of turns.
In einer Ausführungsform weist der Ferritkern eine elektrisch isolierende Beschichtung auf. In one embodiment, the ferrite core has an electrically insulating coating.
Die Beschichtung umfasst beispielsweise Epoxid oder Parylen. Bei einer Dicke der Beschichtung von kleiner gleich 0,4 mm weist eine solche Beschichtung eine Durchbruchspannung von mehr als 2000 VR^S (RMS= root mean Square, d.h. Effektivwert) auf. Die Beschichtung erfüllt die Brandschutzklasse UL94V-0. The coating comprises, for example, epoxide or parylene. With a coating thickness of less than or equal to 0.4 mm, such a coating has a breakdown voltage greater than 2000 VR ^ S (RMS = root mean square). The coating fulfills the fire protection class UL94V-0.
In einer Ausführungsform ist die stromkompensierte Drossel mit einem vorzugsweise unbeschichteten Ferritkern in einem Kunststoff-Gehäuse angeordnet. Die Wicklung ist dann auf diesem Gehäuse angeordnet. Das Gehäuse bewirkt vorzugsweise die gleiche elektrische Isolation wie eine isolierende In one embodiment, the current-compensated choke is arranged with a preferably uncoated ferrite core in a plastic housing. The winding is then arranged on this housing. The housing preferably causes the same electrical insulation as an insulating
Beschichtung des Ferritkerns. Das Gehäuse weist in einer Ausführungsform Vorrichtungen zur Fixierung der Drahtenden der stromkompensierten Drossel auf. Coating of the ferrite core. In one embodiment, the housing has devices for fixing the wire ends of the current-compensated throttle.
Des Weiteren wird eine Schaltungsanordnung mit einer zuvor beschrieben stromkompensierten Drossel angegeben, wobei die stromkompensierte Drossel in Reihe zu einem Brückengleich- richter geschaltet ist. Die stromkompensierte Drossel ist im Netzkreis einer Applikationsschaltung z.B. hinter dem Furthermore, a circuit arrangement with a previously described current-compensated choke is specified, wherein the current-compensated choke is connected in series to a bridge rectifier. judge is switched. The current-compensated choke is in the network of an application circuit eg behind the
Brückengleichrichter auf der gleichgerichteten Seite Bridge rectifier on the rectified side
eingebaut. Sie kann aber auch vor dem Brückengleichrichter eingebaut sein. built-in. But it can also be installed in front of the bridge rectifier.
Vorzugsweise wird die stromkompensierte Drossel derart beschaltet, dass der magnetische Fluss, der in dem ersten Wickel erzeugt wird, dem magnetischen Fluss, der in dem zweiten Wickel erzeugt wird, entgegengesetzt gerichtet ist und sich beide Flüsse somit kompensieren. Preferably, the current-compensated choke is connected such that the magnetic flux generated in the first coil is oppositely directed to the magnetic flux generated in the second coil and thus both fluxes compensate each other.
Durch den Einbau hinter einem Brückengleichrichter tritt der Stromfluss durch die beiden Drahtwickel der stromkompen- sierten Drossel nur in einer Richtung auf. Dadurch treten in dem Ferritkern im Bereich der Drahtwickel in die gleiche Richtung Magnetfelder auf. Due to the installation behind a bridge rectifier, the current flow through the two wire coils of the current-compensated choke only occurs in one direction. As a result, magnetic fields occur in the same direction in the ferrite core in the area of the wire windings.
Des Weiteren wird ein Verfahren zur Herstellung einer stromkompensierten Drossel angegeben, wobei ein Flachdraht spiralförmig zu einem Drahtwickel geformt wird. Der Furthermore, a method of manufacturing a current-compensated choke is provided wherein a flat wire is spirally formed into a wire coil. Of the
vorgeformte, spiralförmige Drahtwickel wird auf einen Preformed, spiral wire wrap is applied to one
bereitgestellten ringförmig geschlossenen Ferritkern derart aufgebracht, dass die einzelnen Windungen des Drahtwickels nacheinander, durch relative Drehung zwischen Drahtwickel und Ferritkern, auf den Ferritkern aufgedreht werden. provided annularly closed ferrite core applied such that the individual turns of the wire winding are turned on successively, by relative rotation between the wire coil and ferrite core on the ferrite core.
Zum Erleichtern des Bewicklungsvorgangs können vorzugsweise sämtliche Kanten des Ferritkerns angefast sein, das heißt die Kanten sind abgeschrägt oder abgerundet. To facilitate the Bewicklungsvorgangs may preferably be chamfered all edges of the ferrite core, that is, the edges are chamfered or rounded.
Der Drahtwickel wird vorzugsweise einlagig auf den Ferritkern aufgebracht. Möglich ist auch, zwei Wickel übereinander aufzubringen und elektrisch parallel zu verschalten. Bei geeignetem Durchmesser können die beiden Wicklungen mit dem Verfahren auch übereinander aufgedreht werden. The wire coil is preferably applied in one layer to the ferrite core. It is also possible to apply two wraps one above the other and connect them electrically in parallel. at suitable diameter, the two windings can also be turned on one another with the method.
In einer weiteren Ausführungsform wird ein zweiter In a further embodiment, a second
vorgeformter Drahtwickel nach dem zuvor beschriebenen preformed wire wrap after the previously described
Verfahren auf den Ferritkern aufgebracht, wobei der zweite Drahtwickel vorzugsweise mit entgegen gesetzter  Method applied to the ferrite core, wherein the second wire coil preferably with opposite
Wicklungsrichtung auf den Ferritkern aufgebracht wird. Der zweite Drahtwickel wird vorzugsweise derart auf dem Winding direction is applied to the ferrite core. The second wire coil is preferably on the
Ferritkern aufgebracht, dass der räumliche Abstand zwischen den beiden Drahtwickeln möglichst groß ist.  Ferrite core applied so that the spatial distance between the two wire coils is as large as possible.
Durch das zuvor beschriebene Verfahren lassen sich By the method described above can be
vorzugsweise Flachdrahtwickel, die in leicht gestrecktem Zustand vorliegen, durch Drehung auf den einstückigen, rechteckigen oder toroidförmigen Ferritkern quasi preferably flat wire windings, which are in a slightly stretched state, by rotation on the one-piece, rectangular or toroidal ferrite core quasi
aufschrauben. Das zuvor beschriebene Verfahren eignet sich besonders für hochkant gewickelte Flachdrahtwickel. Screw. The method described above is particularly suitable for edgewise wound flat wire wraps.
Durch den Aufbau der stromkompensierten Drossel mit einem einlagigen Flachdrahtwickel wird kein zusätzlicher Due to the structure of the current-compensated choke with a single-layer flat wire winding is no additional
Spulenkörper benötigt. Zur Fixierung der Anschlüsse der Spool needed. For fixing the connections of the
Drahtwickel reichen beispielsweise wenige Tropfen eines beispielsweise UV-härtenden Klebstoffes aus. Für Anwendungen, bei denen Trägerplatten von Vorteil sind, können diese auch mit der zuvor beschriebenen stromkompensierten Drossel kombiniert werden. Durch den Aufbau der stromkompensierten Drossel mit Wire wraps are sufficient, for example, a few drops of an example, UV-curing adhesive. For applications in which support plates are advantageous, they can also be combined with the above-described current-compensated inductor. By building the current-compensated choke with
niederohmigen Drahtwickeln aus Flachdraht, die auf einem einteiligen Ferritkern angeordnet sind wird die Low-resistance wire coils of flat wire, which are arranged on a one-piece ferrite core is the
Eigenerwärmung der stromkompensierten Drossel begrenzt. Der Nennstrom ist abhängig von dem thermisch möglichen und von dem durch die Sättigung des Ferritkerns bedingten maximalen Strom. Self-heating of the current-compensated throttle limited. The rated current depends on the thermally possible and of the maximum current due to the saturation of the ferrite core.
In einer beispielhaften Ausführungsform weist eine zuvor beschriebene stromkompensierte Drossel beispielsweise eineFor example, in an exemplary embodiment, a current-compensated choke described above has one
Grundfläche von zirka 27 x 26 mm und eine Höhe von 11 mm auf, wobei die Drossel einen rechteckigen Ferritkern mit zwei Drahtwickeln mit einer Induktivität von jeweils 1 mH Base area of approximately 27 x 26 mm and a height of 11 mm, the choke a rectangular ferrite core with two wire coils with an inductance of 1 mH
aufweist. In dieser Ausführungsform kann die stromkompen- sierte Drossel beispielsweise bis zirka 5 A (Spitzenstrom) ausgesteuert werden. Die Streuinduktivität der stromkompensierten Drossel ist hierbei im Vergleich zu einer Drossel auf Ringkernbasis um zirka 37 % höher. Die oben beschriebenen Gegenstände und Verfahren werden anhand der folgenden Figuren und Ausführungsbeispiele näher erläutert . having. In this embodiment, the current-compensated reactor can be controlled, for example, up to approximately 5 A (peak current). The stray inductance of the current-compensated choke is approximately 37% higher than that of a choke on toroidal base. The objects and methods described above will be explained in more detail with reference to the following figures and exemplary embodiments.
Die nachfolgend beschriebenen Zeichnungen sind nicht als maßstabgetreu aufzufassen. The drawings described below should not be construed as true to scale.
Es zeigt It shows
Figur 1 eine erste Ausführungsform der stromkompensierten Figure 1 shows a first embodiment of the current-compensated
Drossel mit einem Ferritkern,  Choke with a ferrite core,
Figur 2 den Verlauf der Sättigung eines Ferritkerns einer stromkompensierten Drossel in Abhängigkeit vom Nennstrom, FIG. 2 shows the profile of the saturation of a ferrite core of a current-compensated choke as a function of the nominal current,
Figur 3 die Flussdichteverteilung einer Ausführungsform FIG. 3 shows the flux density distribution of an embodiment
einer stromkompensierten Drossel, Figur 4 ein Schaltbild einer Applikationsschaltung mit einer stromkompensierten Drossel, a current-compensated choke, 4 shows a circuit diagram of an application circuit with a current-compensated choke,
Figur 5 das Bewickeln eines geschlossenen Ferritkerns mit einem vorgeformten Drahtwickel, FIG. 5 the winding of a closed ferrite core with a preformed wire coil,
Figur 6 eine weitere Ausführungsform der stromkompensierten Figure 6 shows another embodiment of the current-compensated
Drossel mit einem Ferritkern in toroidaler Form. Figur 1 zeigt eine erste Ausführungsform der  Throttle with a ferrite core in toroidal shape. FIG. 1 shows a first embodiment of the invention
stromkompensierten Drossel 1 mit einem rechteckigen current-compensated choke 1 with a rectangular
Ferritkern 2. Der Ferritkern 2 weist zwei Drahtwickel 4, 5 auf, die auf gegenüberliegenden Seiten des Ferritkerns 2 angeordnet sind. Ferrite Core 2. The ferrite core 2 has two wire coils 4, 5 disposed on opposite sides of the ferrite core 2.
In einer weiteren, später dargestellten Ausführungsform weist der Ferritkern die Form eines Ringtorus auf. In a further embodiment, shown later, the ferrite core has the shape of a ring torus.
Figur 2 zeigt den Verlauf 10 der relativen Induktivität L/LQ in Abhängigkeit von der Stromstärke I. Auf der X-Achse des Diagramms ist die Stromstärke I in Ampere aufgetragen. Auf der Y-Achse ist die relative Induktivität in Prozent Figure 2 shows the curve 10 of the relative inductance L / L Q as a function of the current I. On the X-axis of the diagram, the current I is plotted in amperes. On the Y-axis, the relative inductance is in percent
angegeben. Die relative Induktivität L/LQ gibt die specified. The relative inductance L / L Q gives the
Induktivität bei vorgegebenem Strom im Vergleich zum Inductance at a given current compared to
Induktivitätswert LQ ohne Strombelastung an. Die Abnahme wird bei feldstärkeabhängiger Magnetisierung des Kernmaterials im stromkompensierten Betrieb durch den Strom verursacht. Eine erfindungsgemäße stromkompensierte Drossel weist bei einer Stromstärke von zirka 5,5 A eine relative Induktivität von etwa 90 % auf. Bei 9A weist die stromkompensierte Drossel noch eine relative Induktivität von 60 % auf. Inductance value L Q without current load on. The decrease is caused by field current-dependent magnetization of the core material in current-compensated operation by the current. A current-compensated choke according to the invention has a relative inductance of approximately 90% at a current intensity of approximately 5.5 A. At 9A, the current compensated choke still has a relative inductance of 60%.
Figur 3 zeigt die Flussdichteverteilung im Ferritkern einer stromkompensierten Drossel bei Bestromung mit Nennstrom. Im Bereich der Drahtwickel 54 und 55 tritt ein Maximum der FIG. 3 shows the flux density distribution in the ferrite core of a current-compensated choke when supplied with nominal current. in the Area of the wire coils 54 and 55 occurs a maximum of
Magnetisierung auf. Magnetization on.
Figur 4 zeigt schematisch eine stromkompensierte Drossel in einem Schaltbild einer Applikationsschaltung. Die FIG. 4 schematically shows a current-compensated choke in a circuit diagram of an application circuit. The
Applikationsschaltung zeigt eine beschriebene Application circuit shows a described
stromkompensierte Drossel 1, die in Reihe zu einem current-compensated choke 1 connected in series to a
Brückengleichrichter 11 geschaltet ist. Der Aufbau der Bridge rectifier 11 is connected. The construction of the
Schaltung entspricht in etwa einer Netzfilter-Schaltung (Line filter) . Circuit corresponds approximately to a line filter circuit.
Beim Einbau der stromkompensierten Drossel 1 hinter dem When installing the current-compensated choke 1 behind the
Brückengleichrichter 11 tritt ein Stromfluss durch die beiden Wicklungen der stromkompensierten Drossel 1 nur noch in einer Richtung auf. Dadurch wird der Ferritkern der Bridge rectifier 11 occurs a current flow through the two windings of the current-compensated inductor 1 only in one direction. This will make the ferrite core the
stromkompensierten Drossel 1 immer in die gleiche Richtung magnetisiert . current-compensated choke 1 always magnetized in the same direction.
Figur 5 zeigt das Bewickeln eines geschlossenen, rechteckigen Ferritkerns 62 mit einem Drahtwickel 65. Im dargestellten Schritt ist auf dem Ferritkern 62 bereits ein erster FIG. 5 shows the winding of a closed, rectangular ferrite core 62 with a wire winding 65. In the illustrated step, a first one is already present on the ferrite core 62
Drahtwickel 64 aufgebracht. Der zweite Drahtwickel 65 ist in der Figur in etwa zur Hälfte auf dem Ferritkern 62 Wire wrap 64 applied. The second wire coil 65 is approximately halfway on the ferrite core 62 in the figure
aufgedreht. Hierbei wird der vorgeformte Drahtwickel 65 im gestreckten Zustand durch Drehung auf den Ferritkern 62 aufgebracht. Die einzelnen Windungen des Drahtwickels 65 werden hierbei durch eine relative Drehung zwischen psyched. Here, the preformed wire coil 65 is applied in the stretched state by rotation on the ferrite core 62. The individual turns of the wire coil 65 are here by a relative rotation between
Drahtwickel 65 und Ferritkern 62 auf dem Ferritkern 62 „aufgeschraubt". Der Ferritkern 62 weist eine geschlossene Form auf. The wire winding 65 and the ferrite core 62 are "screwed" onto the ferrite core 62. The ferrite core 62 has a closed shape.
Figur 6 zeigt eine weitere Ausführungsform der FIG. 6 shows a further embodiment of the
stromkompensierten Drossel 1 ähnlich zu der in Figur 1 gezeigten Ausführungsform der stromkompensierten Drossel, wobei der Ferritkern 72 der Drossel 1 in Figur 7 eine toroidale Form aufweist. current-compensated reactor 1 similar to the embodiment of the current-compensated reactor shown in Figure 1, wherein the ferrite core 72 of the reactor 1 in Figure 7 has a toroidal shape.
Bezugszeichenliste LIST OF REFERENCE NUMBERS
1 stromkompensierte Drossel 1 current-compensated choke
2, 52, 62, 72 Ferritkern  2, 52, 62, 72 ferrite core
4, 54, 64 Drahtwickel  4, 54, 64 Wire wrap
5, 55, 65 Drahtwickel  5, 55, 65 Wire wrap
10 Sättigungsverlauf einer Drossel 10 saturation course of a throttle
11 Brückengleichrichter 11 bridge rectifier
12, 13, 14 Kondensator  12, 13, 14 capacitor
15 Widerstand  15 resistance
16 Diode  16 diode
17 Masse  17 mass

Claims

Patentansprüche claims
1. Stromkompensierte Drossel, aufweisend 1. Current-compensated choke, comprising
einen einstückigen, ringförmig geschlossenen Ferritkern (2), der wenigstens zwei Drahtwickel (4, 5) aus jeweils einem hochkant gewickelten Flachdraht aufweist, die voneinander beabstandet auf dem Ferritkern (2) angeordnet sind. a one-piece, annularly closed ferrite core (2) having at least two wire coils (4, 5) each consisting of a vertically wound flat wire spaced from each other on the ferrite core (2) are arranged.
2. Stromkompensierte Drossel nach Anspruch 1, 2. Current-compensated choke according to claim 1,
wobei der Ferritkern (2) eine rechteckige oder toroidale Form aufweist . wherein the ferrite core (2) has a rectangular or toroidal shape.
3. Stromkompensierte Drossel nach einem der vorhergehenden Ansprüche, 3. Current-compensated choke according to one of the preceding claims,
wobei die Drahtwickel (4, 5) jeweils nur eine Lage aufweisen. wherein the wire coils (4, 5) each have only one layer.
4. Stromkompensierte Drossel nach einem der vorhergehenden Ansprüche, 4. Current-compensated choke according to one of the preceding claims,
wobei zwischen den beiden Drahtwickeln (4, 5) ein wherein between the two wire coils (4, 5) a
größtmöglicher räumlicher Abstand zueinander eingehalten ist. the greatest possible spatial distance is maintained.
5. Stromkompensierte Drossel nach einem der vorhergehenden Ansprüche, 5. Current-compensated choke according to one of the preceding claims,
wobei die Drahtwickel (4, 5) symmetrisch zueinander wherein the wire coils (4, 5) symmetrical to each other
verschaltet sind, aber zueinander einen gegenläufigen are interconnected, but to one another in opposite directions
Wickelsinn aufweisen. Have winding sense.
6. Stromkompensierte Drossel nach einem der vorhergehenden Ansprüche, 6. Current-compensated choke according to one of the preceding claims,
wobei der Ferritkern (2) eine elektrisch isolierende wherein the ferrite core (2) is an electrically insulating
Beschichtung aufweist. Coating has.
7. Stromkompensierte Drossel nach einem der vorhergehenden Ansprüche, bei der die Wicklung spulenkörperfrei auf dem Ferritkern aufgebracht ist. 7. Current-compensated choke according to one of the preceding claims, in which the winding is applied bobbin-free on the ferrite core.
8. Stromkompensierte Drossel nach einem der Ansprüche 1-7, bei der der Ferritkern in einem Gehäuse angeordnet ist und bei der die Wicklung auf dem Gehäuse angeordnet ist. 8. A current-compensated reactor according to any one of claims 1-7, wherein the ferrite core is disposed in a housing and wherein the winding is disposed on the housing.
9. Verfahren zur Herstellung einer stromkompensierten Drossel nach Anspruch 1, bei dem 9. A method for producing a current-compensated choke according to claim 1, wherein
ein Flachdraht spiralförmig so zu einem Drahtwickel (64,65) geformt wird, dass der im Querschnitt des Flachdrahts größte Durchmesser senkrecht auf der Wickelachse steht, a flat wire is spirally shaped into a wire winding (64, 65) in such a way that the largest diameter in the cross section of the flat wire is perpendicular to the winding axis,
und bei dem der vorgeformte, spiralförmige Drahtwickel (65) auf einen bereitgestellten geschlossenen Ferritkern (62) derart aufgebracht wird, dass die einzelnen Windungen des Drahtwickels (65) nacheinander durch relative Drehung zwischen Drahtwickel (65) und Ferritkern (62) auf den and in which the preformed helical wire wrap (65) is applied to a provided closed ferrite core (62) such that the individual turns of the wire wrap (65) are successively twisted by relative rotation between the wire wrap (65) and ferrite core (62)
Ferritkern aufgebracht werden. Ferrite core are applied.
10. Verfahren nach Anspruch 9, bei dem 10. The method of claim 9, wherein
der Draht einlagig auf den Ferritkern (62) aufgebracht wird. the wire is applied in one layer to the ferrite core (62).
11. Verfahren nach Anspruch 9, bei dem 11. The method of claim 9, wherein
der Ferritkern in einem Gehäuse angeordnet ist und bei dem die Wicklung auf dem Gehäuse aufgebracht wird. the ferrite core is arranged in a housing and in which the winding is applied to the housing.
12. Verfahren nach einem der Ansprüche 9-11, bei dem ein zweiter vorgeformter Drahtwickel (65) auf den 12. The method according to any one of claims 9-11, wherein a second preformed wire coil (65) on the
geschlossenen Ferritkern (62) in gleicher Weise aufgebracht wird. closed ferrite core (62) is applied in the same way.
EP10739571.7A 2009-08-06 2010-07-27 Current compensated inductor and method for producing a current compensated inductor Active EP2462596B1 (en)

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PCT/EP2010/060897 WO2011015491A1 (en) 2009-08-06 2010-07-27 Current compensated inductor and method for producing a current compensated inductor

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JP2013501369A (en) 2013-01-10
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