EP0033441A1 - Pulse transformer and its use as isolation transformer - Google Patents

Pulse transformer and its use as isolation transformer Download PDF

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Publication number
EP0033441A1
EP0033441A1 EP81100159A EP81100159A EP0033441A1 EP 0033441 A1 EP0033441 A1 EP 0033441A1 EP 81100159 A EP81100159 A EP 81100159A EP 81100159 A EP81100159 A EP 81100159A EP 0033441 A1 EP0033441 A1 EP 0033441A1
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EP
European Patent Office
Prior art keywords
conductors
conductor
circuit board
connection
printed circuit
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Granted
Application number
EP81100159A
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German (de)
French (fr)
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EP0033441B1 (en
Inventor
Heinrich Ryser
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Hasler AG
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Hasler AG
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Priority to AT81100159T priority Critical patent/ATE9419T1/en
Publication of EP0033441A1 publication Critical patent/EP0033441A1/en
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Publication of EP0033441B1 publication Critical patent/EP0033441B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/0006—Printed inductances
    • 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
    • H01F19/00—Fixed transformers or mutual inductances of the signal type
    • H01F19/04—Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range
    • H01F19/08—Transformers having magnetic bias, e.g. for handling pulses
    • 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
    • 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
    • H01F2017/065—Core mounted around conductor to absorb noise, e.g. EMI filter
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F19/00—Fixed transformers or mutual inductances of the signal type
    • H01F19/04—Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range
    • H01F19/08—Transformers having magnetic bias, e.g. for handling pulses
    • H01F2019/085—Transformer for galvanic isolation
    • 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
    • H01F2027/2861—Coil formed by folding a blank

Definitions

  • the invention relates to a pulse transformer with an annular, seamlessly closed core and with primary and secondary windings, the windings of the windings being formed from elongated conductors which are applied in parallel next to one another on flexible, plate-shaped carriers made of insulating material, the carriers including the conductor being passed through the The core is inserted and bent together in a loop, and the ends of the conductors are electrically connected to one another.
  • Pulse transformers also called pulse transformers, should be small and have good transmission properties, which means above all rapid pulse rise and fall times. This leads to the preference of closed, seamless toroidal cores as the transmitter core.
  • toroidal cores have the disadvantage that the windings cannot be attached in a way that is favorable to the work.
  • pulse transmitters on the market today, the wire turns of which are formed by U-shaped wire brackets which are connected by soldering to star-shaped conductor tracks of a load-bearing printed circuit board to form "windings" (described for example by the document FR-A-2 394 878). Furthermore, pulse transmitters are known in which the central, concentric Opening of the primary and secondary windings is introduced in a special way, so that a complete transformer is obtained. A similar way is shown by the document US Pat. No. 3,659,240, according to which two coils and thus a complete pulse transmitter are formed by successively applying thick film conductor segments to a closed magnetic core.
  • a transducer is known from IBM Technical Disclosure Bulletin, volume 12, number 6, November 1969, New York, in which a flexible carrier plate made of insulating material with a plurality of parallel conductor tracks applied to it serves to form a coil.
  • the carrier plate together with the conductor tracks is pulled through the rectangular core provided with a rectangular opening and bent together in a loop.
  • the interconnecting conductors are then electrically connected to one another, for example soldered.
  • the object of the invention is therefore to provide an easy-to-manufacture pulse transformer, whose windings against all electromagnetic coming from the outside Interferences are shielded.
  • the aim is to shield such faults that are introduced via line shields and / or grounded line parts of connecting lines, etc.
  • the pulse transmitter according to the invention has very good electrical properties, that the digital signals transmitted by the transmitter are hardly influenced by external interference and that the manufacturing costs are significantly reduced compared to the known pulse transmitters. Furthermore, when using the pulse transmitters, there are simplifications in the connection electronics and elegant options for the combination of signal and feed lines that meet the highest security requirements.
  • Fig. 1 shows a section through a pulse transmitter mounted on a supporting circuit board.
  • 11 is this printed circuit board, which is composed of a three-layer plate made of insulating material 12, a lower conductor layer 13, an upper conductor layer 14 and a middle conductor layer 15.
  • a coaxial cable 20 is connected to the printed circuit board 11, preferably via a coaxial connector.
  • the center conductor 21 of the Coaxial cable 20 is conductively connected via a cutout 22 in the upper conductor layer 14 to a conductor path in the middle conductor layer 15.
  • 23 is a cross connection via which the shielding of the coaxial cable 20 is connected to the lower (13) and the upper conductor layer 14 of the supporting printed circuit board 11.
  • the width of the conductor strip 15 in the middle conductor layer is designed such that, together with the distance between the layers 15, 13 and 14 and with the electrical properties of the insulating material 12, there is a characteristic impedance which corresponds to that of the coaxial cable 20.
  • This characteristic impedance can be, for example, 75 ⁇ .
  • Both printed circuit boards are loop-shaped and mechanically and at least partially electrically connected to the supporting printed circuit board 11 via pins 36 to 39 or 46 to 49.
  • the pin 39 connects the lower (13) and upper (14) conductor layers of the load-bearing circuit board 11 with corresponding layers of the flexible circuit board 31.
  • the pin 36 connects the conductor track 15 to the start of the primary winding.
  • the remaining Pins 37 and 38 exclusively connect points of the flexible printed circuit board 31 to one another. The type of connection is discussed in detail below with reference to FIG. 2.
  • a non-conductive intermediate region 42 which corresponds to a corresponding intermediate region 41 on the underside of the printed circuit board 11.
  • These intermediate areas 41 and 42 provide a galvanic separation between the conductor areas 13 and 14 lying at the potential of the coaxial cable sheath and the conductor areas 43 and 44, which are at the arbitrary reference potential of an electronic circuit, for example an amplifier or driver circuit. This creates a complete electrical isolation between the input and the output area of the pulse transmitter.
  • FIG. 2 shows an exploded drawing of the printed circuit board designated 31 in FIG. 1, which has the shape of a flat strip.
  • 51 to 57 are seven superimposed and welded layers, of which layers 51, 53, 55 and 57 consist of insulating material and layers 52, 54 and 56 consist of metal, for example copper. All layers have a distinct longitudinal direction is large compared to their cross direction. All layers have no holes or connections in the middle area. Rather, these are arranged at the ends of the multilayer printed circuit board.
  • the dimensions of the circuit board can be, for example, 0.5 x 5 x 50 mm.
  • the upper metal layer 52 has two cutouts 71 and 72 and a solder connection 70.
  • the lower metal layer 56 has corresponding cutouts 87 and 86 and a solder connection 88, which are arranged in mirror image to the corresponding cutouts or connections of the layer 52.
  • the middle metal layer 54 comprises, for example, three conductor tracks 82 to 84, which are delimited by two solder connections 75 to 81, which are arranged one behind the other in two rows in the longitudinal direction.
  • All layers 51 to 57 lying one above the other in the welded state have through-holes 60 to 67 which are plated through at the locations where a soldering support point is arranged in any of the layers, i.e. the walls of which are metallically conductive and are electrically connected to the soldering point (s) in the various metal layers 52, 54 and / or 56.
  • a winding of three turns is formed, which is connected to the central conductor 21 of the coaxial cable 20 via the conductor 15 and the pin 36.
  • the three windings consist of the conductors 82, 83 and 84 and the pins 37 and 38. The end of this winding is. connected to the conductor layers 13 and 14 of the load-bearing printed circuit board 11 and thus to the potential of the jacket of the coaxial cable 20 via the pin 39.
  • the layers 52 and 56 of the flexible printed circuit board 31 are each connected to the conductive layers 13 and 14 via a point in the soldered state and form two shielding layers which almost completely surround the winding described. Although these shielding layers are curved in a ring, they do not form closed rings.
  • the bending direction of the shielding layers with respect to their connection points 70 and 88 is in opposite directions and their width is so large that they broadly cover the conductor tracks 82 to 84 between them, which form the winding. Taking into account the small layer thicknesses of layers 53 to 54, this ensures that the conductor tracks are shielded on all sides against electromagnetic interference.
  • the primary and secondary windings can be formed by flexible printed circuit boards 31 and 32 of the same type.
  • a pulse transformer is created, the transmission ratio of which is 1: 1.
  • other translation ratios can also be produced in a simple manner.
  • a connecting pin can be provided as the center tap, which results in a winding with two plus two turns.
  • FIGS. 1 and 2 there are a number of variants.
  • One of these variants consists in forming the layers 52 and 56 of the flexible printed circuit board not in mirror image, but rather in an identical manner. When the circuit board is bent in a loop, two shielding layers are created, which have the same bending direction with regard to their connection points.
  • a conductor layer which has more or less than three conductor tracks can be used instead of a layer 54 which has three parallel conductor tracks 82 to 84. Furthermore, instead of such a layer, a plurality of such layers can be arranged one above the other, as a result of which windings with more than three turns can be produced.
  • a two-layer plate according to FIG. 3 can be provided.
  • the four conductor tracks 90 to 93 which have connection points at their two ends and are used for winding production, are arranged on one side 94 of the plate.
  • By folding the plate parallel to the conductor tracks 90 to 93 one half of the layer 96 is placed over these conductor tracks 90 to 93, while the other half is on the Bottom remains. In this way, a unit is created which is made up of interconnects which are insulated from one another and which is shielded on all sides from the outside.
  • An insulating cover layer 97 provides insulation from the outside and enables welding at the otherwise open fold end 98.
  • a functionally identical unit can be constructed, in which the conductor tracks for forming the winding consist of insulated wires, for example enamelled wires.
  • 4a shows a plan view of these staggered parallel wires 101 to 103, which are held on the top and bottom by an insulating layer each carrying a conductor layer, so that in turn there is a unit in which conductors lying in the middle with connection points are shielded from the outside by shielding layers at both ends.
  • the connection points can either be formed by the wires 101 to 103 being led out laterally or by drill holes 104 to 106 which are provided in such a way that: one wire is drilled into each side and thus stripped.
  • the holes formed in this way can be plated through and thus correspond completely to the holes 60 to 67 of FIG. 2.
  • Fig. 4b shows such a unit that is bent into a loop.
  • the protruding wires 101 to 103 are with their stripped ends directly in the holes 104 to 106 soldered.
  • the pins 36 to 39 and 46 to 49 shown in FIG. 1 are therefore unnecessary.
  • two or more ferrite cores arranged coaxially next to one another can serve as the transmission core, through the openings of which the flexible printed circuit boards 31 and 32 pass.
  • the coaxial cable 20 can only be mechanically fastened to the supporting printed circuit board 11 and its central conductor 21 can be connected directly to the start of the winding of the flexible printed circuit board 31.
  • the shielding layers 52 and 56 of the flexible printed circuit board can be narrowed in the shape of a dumbbell in the middle in order to obtain improved insulating ability of the insulating layer welding at the bending points.
  • the flexible printed circuit boards 31 and 32 can also penetrate the core in a slightly arcuate manner, as shown in FIG. 5.
  • the flexible circuit board 89 is on both Sides of the toroidal core 30 with pins 91 to 98 on a supporting circuit board 11 electrically and mechanically attached.
  • the conductor tracks corresponding to 82, 83 and 84 of FIG. 2 can either be supplemented by conductor tracks 90 on the supporting printed circuit board 11 or by a second flexible printed circuit board which does not penetrate the toroidal core 30.
  • FIG. 6 shows schematically a holder 110 for a complete pulse transmitter, which is composed of three seamless ferrite cores 30.1, 30.2 and 30.3 which are coaxially one above the other and two loop-shaped winding units, for example printed circuit boards 31 and 32 of the type described with reference to FIG. 2.
  • the pins 112 and 113 of the right-hand unit connect the conductor tracks forming the winding in the manner described and fix the unit to the holder.
  • the remaining pins 111 and 114 are led out of the holder 110 and serve as a soldering pin for connection to the carrier circuit board 11.
  • the winding unit shows an extension 115 which has an additional shielding layer electrically connected to the shielding layers of the flexible circuit board 31. This extension 115 is bent in a lug shape over the pin ends and shields them electrically.
  • the layer 14 of the carrier circuit board 11 takes over the corresponding function. This further improves the shielding properties.
  • the winding sense of the loops of the two winding units of a pulse transformer can, of course, be in the same direction according to FIG. 6 or in opposite directions in somewhat modified geometry.
  • Pulse transformers of the type described are used, for example, as isolating transformers between an electronic circuit arrangement and a transmission line for the transmission of fast digital signals.
  • the transmission line can be designed as a coaxial cable 20 or as another cable suitable for digital signals, for example a four-wire line consisting of two wire pairs.
  • a feed current can flow on this in a manner known per se.

Abstract

The pulse transformer consists of a closed toroidal core (30), the primary winding (31) and secondary winding (32) of which are fashioned as multilayer, flexible printed circuit boards. These circuit boards have the shape of flat strips and are bent into loops. By means of pins (36-39 and 46-49, respectively), they are connected mechanically and partially electrically to a supporting printed circuit board (11). The pins connect the conductor tracks of the central layer of the flexible printed circuit boards with respectively one winding, whereas the upper and lower conductive layers shield the windings against electromagnetic interferences coming from the outside. The pulse transformer is suitable as an isolation transformer for the transmission of rapid digital signals arriving, for example, via a coaxial line (20).

Description

Die Erfindung betrifft einen Impulsübertrager mit ringförmigem, nahtlos geschlossenem Kern und mit Primär- und Sekundärwicklungen, wobei die Windungen der Wicklungen aus länglichen Leitern gebildet werden, welche auf flexiblen, plattenförmigen Trägern aus Isoliermaterial parallel nebeneinanderliegend aufgebracht sind, wobei die Träger samt der Leiter durch den Kern gesteckt und schleifenförmig zusammengebogen sind, und wobei die Enden der Leiter elektrisch miteinander verbunden sind.The invention relates to a pulse transformer with an annular, seamlessly closed core and with primary and secondary windings, the windings of the windings being formed from elongated conductors which are applied in parallel next to one another on flexible, plate-shaped carriers made of insulating material, the carriers including the conductor being passed through the The core is inserted and bent together in a loop, and the ends of the conductors are electrically connected to one another.

Impulsübertrager, auch Impulstransformatoren genannt, sollen klein sein und gute Uebertragungseigenschaften aufweisen, was vor allem schnelle Impulsanstiegs- und Abfallzeiten bedeutet. Dies führt zur Bevorzugung geschlossener, nahtloser Ringkerne als Uebertragerkern. Derartige Ringkerne haben jedoch den Nachteil, dass die Wicklungen nicht arbeitsgünstig anbringbar sind.Pulse transformers, also called pulse transformers, should be small and have good transmission properties, which means above all rapid pulse rise and fall times. This leads to the preference of closed, seamless toroidal cores as the transmitter core. However, such toroidal cores have the disadvantage that the windings cannot be attached in a way that is favorable to the work.

Auf dem Markt sind heute Impulsübertrager, deren Drahtwindungen durch U-förmige Drahtbügel gebildet werden, die durch Verlöten mit sternförmig angeordneten Leiterbahnen einer tragenden Leiterplatte zu "Wicklungen" verbunden sind (beschrieben beispielsweise durch die Schrift FR-A-2 394 878). Weiter sind Impulsübertrager bekannt, bei denen in die zentrale, konzentrische Oeffnung der Primär- und Sekundärwicklung auf spezielle Weise Magnetmaterial eingebracht wird, so dass sich ein vollständiger transformatorischer Uebertrager ergibt. Ein ähnlicher Weg wird durch die Schrift US-A 3 659 240 aufgezeigt, wonach durch sukzessives Aufbringen von Dickfilm-Leitersegmenten auf einen geschlossenen Magnetkern zwei Spulen und damit ein vollständiger Impulsübertrager gebildet werden.There are pulse transmitters on the market today, the wire turns of which are formed by U-shaped wire brackets which are connected by soldering to star-shaped conductor tracks of a load-bearing printed circuit board to form "windings" (described for example by the document FR-A-2 394 878). Furthermore, pulse transmitters are known in which the central, concentric Opening of the primary and secondary windings is introduced in a special way, so that a complete transformer is obtained. A similar way is shown by the document US Pat. No. 3,659,240, according to which two coils and thus a complete pulse transmitter are formed by successively applying thick film conductor segments to a closed magnetic core.

Aus IBM Technical Disclosure Bulletin, Band 12, Heft 6, November 1969, New York, ist schliesslich ein Transducer bekannt, bei dem eine flexible Trägerplatte aus Isoliermaterial mit mehreren auf ihr aufgebrachten parallelen Leiterzügen zur Bildung einer Spule dient. Die Trägerplatte wird hierzu samt der Leiterzüge durch den mit einer rechteckigen Oeffung versehenen Rechteckkern gezogen und schleifenförmig zusammengebogen. Anschliessend werden die sich zusammenfügenden Leiterzüge.miteinander elektrisch verbunden, beispielsweise verlötet.Finally, a transducer is known from IBM Technical Disclosure Bulletin, volume 12, number 6, November 1969, New York, in which a flexible carrier plate made of insulating material with a plurality of parallel conductor tracks applied to it serves to form a coil. For this purpose, the carrier plate together with the conductor tracks is pulled through the rectangular core provided with a rectangular opening and bent together in a loop. The interconnecting conductors are then electrically connected to one another, for example soldered.

Bei Impulsübertragern, die für hohe Impulsfolgefrequenzen verwendet werden, beispielsweise für 16 MHz, ist es günstig, wenn die Wicklungen des Uebertragers gegen äussere elektromagnetische Störungen abgeschirmt sind. Eine derartige Abschirmung ist bei den bekannten Uebertragern jedoch nicht ohne weiteres anbringbar. Die Aufgabe der Erfindung besteht daher darin, einen einfach zu fertigenden Impulsübertrager anzugeben, dessen Wicklungen gegen alle von aussen kommenden elektromagnetischen Störungen abgeschirmt sind. Insbesondere wird angestrebt, auch solche Störungen abzuschirmen, die über Leitungsabschirmungen und/oder geerdete Leitungsteile von Anschlussleitungen usw. eingeschleust werden.In the case of pulse transmitters which are used for high pulse repetition frequencies, for example for 16 MHz, it is advantageous if the windings of the transmitter are shielded against external electromagnetic interference. Such a shield is not readily attachable to the known transmitters. The object of the invention is therefore to provide an easy-to-manufacture pulse transformer, whose windings against all electromagnetic coming from the outside Interferences are shielded. In particular, the aim is to shield such faults that are introduced via line shields and / or grounded line parts of connecting lines, etc.

Die Lösung dieser Aufgabe wird durch den kennzeichnenden Teil des ersten Patentanspruchs angegeben. Die Ansprüche 2 bis 10 geben verschiedene Ausgestaltungen der Erfindung wieder, während Anspruch 11 Angaben über die Verwendung der durch die vorhergehenden Ansprüche definierten Impulsübertrager macht.The solution to this problem is given by the characterizing part of the first claim. Claims 2 to 10 represent different configurations of the invention, while claim 11 specifies the use of the pulse transmitters defined by the preceding claims.

Es hat sich gezeigt, dass der erfindungsgemässe Impulsübertrager sehr gute elektrische Eigenschaften aufweist, dass die durch den Uebertrager übertragenen Digitalsignale durch äussere Störungen kaum beeinflusst werden und dass die Herstellungskosten gegenüber den bekannten Impulsübertragern wesentlich vermindert sind. Weiter ergeben sich bei Verwendung der Impulsübertrager Vereinfachungen bei der Anschlusselektronik und elegante Möglichkeiten für die Kombination von Signal- und Speiseleitungen, die höchsten.Sicherheitsanforderungen genügt.It has been shown that the pulse transmitter according to the invention has very good electrical properties, that the digital signals transmitted by the transmitter are hardly influenced by external interference and that the manufacturing costs are significantly reduced compared to the known pulse transmitters. Furthermore, when using the pulse transmitters, there are simplifications in the connection electronics and elegant options for the combination of signal and feed lines that meet the highest security requirements.

Im folgenden wird anhand von 6 Figuren die Erfindung beispielsweise näher erläutert. Es zeigen:

  • Fig. 1 Schnittzeichnung durch einen auf eine tragende Leiterplatte montierten Impulsübertrager
  • Fig. 2 Explosionszeichnung einer mehrschichtigen, flexiblen Leiterplatte
  • Fig. 3 Schnitt durch eine flexible Leiterplatte
  • Fig. 4a Aufsicht auf eine flexible Einheit mit Isolierdrähten
  • Fig. 4b Seitenansicht derselben Einheit
  • Fig. 5 Schnittzeichnung durch einen zweiten auf eine tragende Leiterplatte montierten Impulsübertrager
  • Fig. 6 Halterung für einen Impulsübertrager.
The invention is explained in more detail below with reference to 6 figures. Show it:
  • Fig. 1 sectional drawing through a pulse transmitter mounted on a supporting circuit board
  • Fig. 2 exploded view of a multilayer, flexible circuit board
  • Fig. 3 section through a flexible circuit board
  • Fig. 4a top view of a flexible unit with insulating wires
  • Fig. 4b side view of the same unit
  • Fig. 5 sectional drawing through a second pulse transmitter mounted on a supporting circuit board
  • Fig. 6 bracket for a pulse transmitter.

Fig. 1 zeigt einen Schnitt durch einen auf eine tragende Leiterplatte montierten Impulsübertrager. 11 ist.diese Leiterplatte, die als dreischichtige Platte aus Isoliermaterial 12, einer unteren Leiterschicht 13, einer oberen Leiterschicht 14 und einer mittleren Leiterschicht 15 zusammengesetzt ist. An die Leiterplatte 11 ist ein Koaxialkabel 20, bevorzugt über einen Koaxialstecker, angeschlossen. Der Mittelleiter 21 des Koaxialkabels 20 ist über eine Aussparung 22 in der oberen Leiterschicht 14 mit einem Leiterzug in der mittleren Leiterschicht 15 leitend verbunden. 23 ist eine Querverbindung, über die die Abschirmung des Koaxialkabels 20 mit der unteren (13) und der oberen Leiterschicht 14 der tragenden Leiterplatte 11 verbunden ist.Fig. 1 shows a section through a pulse transmitter mounted on a supporting circuit board. 11 is this printed circuit board, which is composed of a three-layer plate made of insulating material 12, a lower conductor layer 13, an upper conductor layer 14 and a middle conductor layer 15. A coaxial cable 20 is connected to the printed circuit board 11, preferably via a coaxial connector. The center conductor 21 of the Coaxial cable 20 is conductively connected via a cutout 22 in the upper conductor layer 14 to a conductor path in the middle conductor layer 15. 23 is a cross connection via which the shielding of the coaxial cable 20 is connected to the lower (13) and the upper conductor layer 14 of the supporting printed circuit board 11.

Der Leiterzug 15 in der mittleren Leiterschicht ist in seiner Breite so ausgebildet, dass sich zusammen mit dem Abstand zwischen den Schichten 15, 13 und 14 sowie mit den elektrischen Eigenschaften des Isoliermaterials 12 ein Wellenwiderstand ergibt, der demjenigen des Koaxialkabels 20 entspricht. Dieser Wellenwiderstand kann beispielsweise 75 Ω betragen.The width of the conductor strip 15 in the middle conductor layer is designed such that, together with the distance between the layers 15, 13 and 14 and with the electrical properties of the insulating material 12, there is a characteristic impedance which corresponds to that of the coaxial cable 20. This characteristic impedance can be, for example, 75 Ω.

30 ist ein nahtloser ferromagnetischer Ringkern, durch dessen Oeffnung zur Bildung der Primär- und der Sekundärwicklung eines Impulsübertragers zwei flexible Leiterplatten 31 und 32 hindurchführen. Beide Leiterplatten sind schleifenförmig gebogen und über Stifte 36 bis 39 bzw. 46 bis 49 mit der tragenden Leiterplatte 11 mechanisch und zumindest teilweise elektrisch verbunden. So verbindet der Stift 39 beispielsweise die untere (13) und obere (14) Leiterschicht der tragenden Leiterplatte 11 mit entsprechenden Schichten der flexiblen Leiterplatte 31. Der Stift 36 verbindet den Leiterzug 15 mit dem Wicklungsanfang der Primärwicklung. Die übrigen Stifte 37 und 38 verbinden ausschliesslich Punkte der flexiblen Leiterplatte 31 untereinander. Die Art und Weise der Verbindungen wird anhand von Fig. 2 weiter unten eingehend besprochen.30 is a seamless ferromagnetic toroidal core, through the opening of which two flexible printed circuit boards 31 and 32 pass through to form the primary and secondary windings of a pulse transformer. Both printed circuit boards are loop-shaped and mechanically and at least partially electrically connected to the supporting printed circuit board 11 via pins 36 to 39 or 46 to 49. For example, the pin 39 connects the lower (13) and upper (14) conductor layers of the load-bearing circuit board 11 with corresponding layers of the flexible circuit board 31. The pin 36 connects the conductor track 15 to the start of the primary winding. The remaining Pins 37 and 38 exclusively connect points of the flexible printed circuit board 31 to one another. The type of connection is discussed in detail below with reference to FIG. 2.

Zwischen der oberen Leiterschicht 14 auf der rechten Seite von Fig. 1 und der entsprechenden Schicht 44 links befindet sich ein nichtleitender Zwischenbereich 42, dem ein entsprechender Zwischenbereich 41 auf der Unterseite der Leiterplatte 11 entspricht. Durch diese Zwischenbereiche 41 und 42 erfolgt eine galvanische Trennung zwischen den i auf dem Potential des Koaxialkabelmantels liegenden Leiterbereichen 13 und 14 und den Leiterbereichen 43 und 44, die auf dem beliebigen Bezugspotential einer Elektronikschaltung liegen, beispielsweise einer Verstärker- oder Treiberschaltung. Hierdurch entsteht eine vollständige galvanische Trennung zwischen dem Eingangs- und dem Ausgangsbereich des Impulsübertragers.Between the upper conductor layer 14 on the right side of FIG. 1 and the corresponding layer 44 on the left there is a non-conductive intermediate region 42, which corresponds to a corresponding intermediate region 41 on the underside of the printed circuit board 11. These intermediate areas 41 and 42 provide a galvanic separation between the conductor areas 13 and 14 lying at the potential of the coaxial cable sheath and the conductor areas 43 and 44, which are at the arbitrary reference potential of an electronic circuit, for example an amplifier or driver circuit. This creates a complete electrical isolation between the input and the output area of the pulse transmitter.

Fig. 2 zeigt eine Explosionszeichnung der in Fig. 1 mit 31 bezeichneten Leiterplatte, die die Form eines Flachbandes aufweist. 51 bis 57 sind sieben übereinanderliegende und miteinander verschweisste Schichten, von denen die Schichten 51, 53, 55 und 57 aus Isoliermaterial und die Schichten 52, 54 und 56 aus Metall, beispielsweise aus Kupfer, bestehen. Alle Schichten besitzen eine deutliche Längsrichtung, die gross ist gegenüber ihrer Querrichtung. Alle Schichten besitzen im mittleren Bereich keine Löcher oder Anschlüsse. Diese sind vielmehr an den Enden der mehrschichtigen Leiterplatte angeordnet. Die Dimensionen der Leiterplatte können beispielsweise 0,5 x 5 x 50 mm betragen.FIG. 2 shows an exploded drawing of the printed circuit board designated 31 in FIG. 1, which has the shape of a flat strip. 51 to 57 are seven superimposed and welded layers, of which layers 51, 53, 55 and 57 consist of insulating material and layers 52, 54 and 56 consist of metal, for example copper. All layers have a distinct longitudinal direction is large compared to their cross direction. All layers have no holes or connections in the middle area. Rather, these are arranged at the ends of the multilayer printed circuit board. The dimensions of the circuit board can be, for example, 0.5 x 5 x 50 mm.

Die obere Metallschicht 52 besitzt zwei Aussparungen'71 und 72 sowie einen Lötanschluss 70. Die untere Metallschicht 56 besitzt entsprechende Aussparungen 87 und 86 und einen Lötanschluss-88, welche spiegelbildlich zu den entsprechenden Aussparungen bzw. Anschlüssen der Schicht 52 angeordnet sind. Die mittlere Metallschicht 54 umfasst beispielsweise drei Leiterzüge 82 bis 84, die durch je zwei Lötanschlüsse 75 bis 81 begrenzt sind, die in zwei Reihen in Längsrichtung hintereinander angeordnet sind.The upper metal layer 52 has two cutouts 71 and 72 and a solder connection 70. The lower metal layer 56 has corresponding cutouts 87 and 86 and a solder connection 88, which are arranged in mirror image to the corresponding cutouts or connections of the layer 52. The middle metal layer 54 comprises, for example, three conductor tracks 82 to 84, which are delimited by two solder connections 75 to 81, which are arranged one behind the other in two rows in the longitudinal direction.

Alle im verschweissten Zustand übereinanderliegenden Schichten 51 bis 57 besitzen an den Stellen, an denen in irgendeiner der Schichten ein Lötstützpunkt angeordnet ist, durchgehende Löcher 60 bis 67, die durchplattiert sind, d.h. deren Wände metallisch leitend und mit dem oder den Lötstützpunkt(en) in den verschiedenen Metallschichten 52, 54 und/oder 56 elektrisch verbunden sind.All layers 51 to 57 lying one above the other in the welded state have through-holes 60 to 67 which are plated through at the locations where a soldering support point is arranged in any of the layers, i.e. the walls of which are metallically conductive and are electrically connected to the soldering point (s) in the various metal layers 52, 54 and / or 56.

Die Zusammenstellung des Impulsübertragers erfolgt dadurch, dass die flexiblen Leiterplatten 31 und 32 durch den Ringkern 30 geschoben und anschliessend schleifenförmig in der in Fig. 1 gezeigten Weise zurechtgebogen werden. Durch Einführen der in Fig. 1 gezeigten Stifte 36 bis 39 bzw. 46 bis 49 in die übereinanderliegenden Löcher 63 und 64, 62 und 65, 61 und 66 bzw. 60 und 67 und durch Verlöten dieser Stifte mit den durchplattierten Löchern entstehen folgende Verbindungen mit der Leiterplatte 11:

  • - Stift 39 verbindet über die Löcher 60 und 67 die Lötstützpunkte 70, 81 und 88 mit den Leiterschichten 13 und 14 der tragenden Leiterplatte 11.
  • - Stift 38 verbindet über die Löcher 61 und 66 die Lötstützpunkte 75 und 80 miteinander.
  • - Stift 37 verbindet über die Löcher 62 und 65 die Lötstützpunkte 76 und 79 miteinander.
  • - Stift 36 verbindet über die Löcher 63 und 64 die Lötstützpunkte 77 und 78 mit dem Leiterzug 15 der tragenden Leiterplatte 11.
The pulse transmitter is assembled by pushing the flexible printed circuit boards 31 and 32 through the toroidal core 30 and then in the form of a loop shown in Fig. 1 are bent. By inserting the pins 36 to 39 or 46 to 49 shown in FIG. 1 into the holes 63 and 64, 62 and 65, 61 and 66 or 60 and 67 one above the other and by soldering these pins to the plated-through holes, the following connections are formed PCB 11:
  • - Pin 39 connects the soldering support points 70, 81 and 88 to the conductor layers 13 and 14 of the load-bearing circuit board 11 via the holes 60 and 67.
  • - Pin 38 connects the soldering support points 75 and 80 to one another via the holes 61 and 66.
  • - Pin 37 connects the soldering support points 76 and 79 to one another via the holes 62 and 65.
  • - Pin 36 connects the soldering support points 77 and 78 to the conductor 15 of the load-bearing circuit board 11 via the holes 63 and 64.

Auf diese Weise entsteht eine Wicklung von drei Windungen, die mit dem Mittelleiter 21 des Koaxialkabels 20 über den Leiterzug 15 und den Stift 36 verbunden ist. Die drei Wicklungen bestehen aus den Leiterzügen 82, 83 und 84 sowie den Stiften 37 und 38. Das Ende dieser Wicklung ist. über den Stift 39 mit den Leiterschichten 13 und 14 der tragenden Leiterplatte 11 und damit mit dem Potential des Mantels des Koaxialkabels 20 verbunden.In this way, a winding of three turns is formed, which is connected to the central conductor 21 of the coaxial cable 20 via the conductor 15 and the pin 36. The three windings consist of the conductors 82, 83 and 84 and the pins 37 and 38. The end of this winding is. connected to the conductor layers 13 and 14 of the load-bearing printed circuit board 11 and thus to the potential of the jacket of the coaxial cable 20 via the pin 39.

Die Schichten 52 und 56 der flexiblen Leiterplatte 31 sind im verlöteten Zustand je über einen Punkt mit den leitenden Schichten 13 und 14 verbunden und bilden zwei Abschirmschichten, die die beschriebene Wicklung fast vollständig umgeben. Diese Abschirmungsschichten sind zwar ringförmig gebogen, bilden aber keine geschlossenen Ringe. Die Biegerichtung der Abschirmschichten bezüglich ihrer Anschlusspunkte 70 bzw. 88 ist gegensinnig und ihre Breite ist so gross, dass sie die zwischen ihnen liegenden Leiterzüge 82 bis 84, die die Wicklung bilden, breit überdecken. Damit ist bei Berücksichtigung der geringen Schichtdicken der Schichten 53 bis 54 sichergestellt, dass die Leiterzüge allseitig gegen elektromagnetische Störungen abgeschirmt sind.The layers 52 and 56 of the flexible printed circuit board 31 are each connected to the conductive layers 13 and 14 via a point in the soldered state and form two shielding layers which almost completely surround the winding described. Although these shielding layers are curved in a ring, they do not form closed rings. The bending direction of the shielding layers with respect to their connection points 70 and 88 is in opposite directions and their width is so large that they broadly cover the conductor tracks 82 to 84 between them, which form the winding. Taking into account the small layer thicknesses of layers 53 to 54, this ensures that the conductor tracks are shielded on all sides against electromagnetic interference.

Beim Impulsübertrager entsprechend Fig. 1 können die Primär-und die Sekundärwicklung durch gleichartige flexible Leiterplatten 31 bzw. 32 gebildet sein. In diesem Fall entsteht ein Impulsübertrager, dessen Uebersetzungsverhältnis 1 : 1 beträgt. Durch Verwendung verschiedener Leiterplatten können jedoch auf einfache Weise auch andere Uebersetzungsverhältnisse hergestellt werden. Weiter kann bei beispielsweise vier Leiterzügen der mittleren Schicht 54 ein Verbindungsstift als Mittelabgriff vorgesehen werden, wodurch eine Wicklung mit zwei plus zwei Windungen entsteht.1, the primary and secondary windings can be formed by flexible printed circuit boards 31 and 32 of the same type. In this case, a pulse transformer is created, the transmission ratio of which is 1: 1. By using different circuit boards, however, other translation ratios can also be produced in a simple manner. Furthermore, in the case of, for example, four conductor tracks of the middle layer 54, a connecting pin can be provided as the center tap, which results in a winding with two plus two turns.

Neben den in Fig. 1 und 2 gezeigten beispielsweisen Ausführung der Erfindung gibt es eine Reihe von Varianten. Eine dieser Varianten besteht darin, die Schichten 52 und 56 der flexiblen Leiterplatte nicht spiegelbildlich, sondern identisch auszubilden. Beim schleifenförmigen Zusammenbiegen der Leiterplatte entstehen damit zwei Abschirmschichten, die bezüglich ihrer Anschlusspunkte die gleiche Biegerichtung aufweisen.In addition to the exemplary embodiment of the invention shown in FIGS. 1 and 2, there are a number of variants. One of these variants consists in forming the layers 52 and 56 of the flexible printed circuit board not in mirror image, but rather in an identical manner. When the circuit board is bent in a loop, two shielding layers are created, which have the same bending direction with regard to their connection points.

Statt einer Schicht 54, die drei parallele Leiterzüge 82 bis 84 aufweist, kann eine Leiterschicht verwendet werden, die mehr oder weniger als drei Leiterzüge aufweist. Weiter können statt einer derartigen Schicht mehrere derartige Schichten übereinander angeordnet werden, wodurch Wicklungen mit mehr als drei Windungen herstellbar sind.Instead of a layer 54 which has three parallel conductor tracks 82 to 84, a conductor layer which has more or less than three conductor tracks can be used. Furthermore, instead of such a layer, a plurality of such layers can be arranged one above the other, as a result of which windings with more than three turns can be produced.

Statt einer Leiterplatte mit drei Metallschichten entsprechend Fig. 2 kann eine zweischichtige Platte entsprechend Fig. 3 vorgesehen werden. Bei dieser sind die beispielsweise vier Leiterzüge 90 bis 93, die Anschlusspunkte an ihren beiden Enden aufweisen und zur Wicklungsherstellung dienen, auf der einen Plattenseite 94 angeordnet. Auf der andern..Plattenseite befindet sich eine einzige grösserflächige Metallschicht 96. Durch Zusammenfalten der Platte parallel zu den Leiterzügen 90 bis 93 legt sich die eine Hälfte der Schicht 96 über diese Leiterzüge 90 bis 93, während die andere Hälfte auf der Unterseite verbleibt. Auf diese Weise entsteht eine aus gegeneinander isolierten Leiterzügen aufgebaute Einheit, die allseitig nach aussen abgeschirmt ist. Eine isolierende Deckschicht 97 bewirkt eine Isolierung nach aussen und ermöglicht eine Verschweissung am sonst offenen Faltende 98.Instead of a printed circuit board with three metal layers according to FIG. 2, a two-layer plate according to FIG. 3 can be provided. In this example, the four conductor tracks 90 to 93, which have connection points at their two ends and are used for winding production, are arranged on one side 94 of the plate. On the other .. plate side there is a single, larger-area metal layer 96. By folding the plate parallel to the conductor tracks 90 to 93, one half of the layer 96 is placed over these conductor tracks 90 to 93, while the other half is on the Bottom remains. In this way, a unit is created which is made up of interconnects which are insulated from one another and which is shielded on all sides from the outside. An insulating cover layer 97 provides insulation from the outside and enables welding at the otherwise open fold end 98.

Aehnllch wie die oben beschriebene gefaltete Leiterplatte ist eine funktionsgleiche Einheit aufbaubar, bei der die Leiterzüge zur Bildung der Wicklung aus isolierten Drähten, beispielsweise Lackdrähten, bestehen. Fig. 4a zeigt eine Aufsicht auf diese versetzt parallel liegenden Drähte 101 bis 103, die auf der Ober- und Unterseite durch je eine eine Leiterschicht tragende Isolierschicht gehalten werden, so dass wiederum eine Einheit gegeben ist, bei der in der Mitte liegende Leiterzüge mit Anschlusspunkten an beiden Enden durch Abschirmschichten nach aussen abgeschirmt sind. Die Anschlusspunkte können entweder durch seitliches Herausführen der Drähte 101 bis 103 gebildet sein oder durch Bohrlöcher 104 bis 106, die so angebracht sind, dass:jeweils ein Draht seitlich angebohrt und damit abisoliert ist. Die so gebildeten Löcher sind galvanisch durchplattierbar und entsprechen damit vollständig den Löchern 60 bis 67 von Fig. 2.Similar to the folded printed circuit board described above, a functionally identical unit can be constructed, in which the conductor tracks for forming the winding consist of insulated wires, for example enamelled wires. 4a shows a plan view of these staggered parallel wires 101 to 103, which are held on the top and bottom by an insulating layer each carrying a conductor layer, so that in turn there is a unit in which conductors lying in the middle with connection points are shielded from the outside by shielding layers at both ends. The connection points can either be formed by the wires 101 to 103 being led out laterally or by drill holes 104 to 106 which are provided in such a way that: one wire is drilled into each side and thus stripped. The holes formed in this way can be plated through and thus correspond completely to the holes 60 to 67 of FIG. 2.

Fig. 4b zeigt eine derartige Einheit, die zu einer Schlaufe gebogen ist. Die herausstehenden Drähte 101 bis 103 sind mit ihren abisolierten Enden direkt in den Löchern 104 bis 106 verlötet. Die in Fig. 1 gezeigten.Stifte 36 bis 39 bzw. 46 bis 49 erübrigen sich damit.Fig. 4b shows such a unit that is bent into a loop. The protruding wires 101 to 103 are with their stripped ends directly in the holes 104 to 106 soldered. The pins 36 to 39 and 46 to 49 shown in FIG. 1 are therefore unnecessary.

Statt eines einzigen geschlossenen Ferritringes können als Uebertragerkern zwei oder mehr koaxial nebeneinander angeordnete Ferritkerne dienen, durch deren Oeffnungen die flexiblen Leiterplatten 31 und 32 hindurchgehen.Instead of a single closed ferrite ring, two or more ferrite cores arranged coaxially next to one another can serve as the transmission core, through the openings of which the flexible printed circuit boards 31 and 32 pass.

Das Koaxialkabel 20 kann ausschliesslich mechanisch an der tragenden Leiterplatte 11 befestigt und dessen Mittelleiter 21 direkt mit dem Wicklungsanfang der flexiblen Leiterplatte 31 verbunden sein.The coaxial cable 20 can only be mechanically fastened to the supporting printed circuit board 11 and its central conductor 21 can be connected directly to the start of the winding of the flexible printed circuit board 31.

Damit eine gute Spannungsfestigkeit gegenüber höheren Spannungen gewährleistet wird, können die Abschirmschichten 52 und 56 der flexiblen Leiterplatte in der Mitte hantelförmig verengt sein, um an den Biegestellen verbesserte Isolierfähigkeit der Isolierschichten-Verschweissung zu bekommen.In order to ensure a good dielectric strength against higher voltages, the shielding layers 52 and 56 of the flexible printed circuit board can be narrowed in the shape of a dumbbell in the middle in order to obtain improved insulating ability of the insulating layer welding at the bending points.

Statt den Ferritkern schleifenförmig zu durchsetzen, können die flexiblen Leiterplatten 31 und 32 den Kern.auch leicht bogenförmig entsprechend Fig. 5 durchsetzen. In diesem Fall ist beispielsweise die flexible Leiterplatte 89 auf beiden Seiten des Ringkerns 30 mit Stiften 91 bis 98 auf einer tragenden Leiterplatte 11 elektrisch und mechanisch befestigt. Die Leiterzüge entsprechend 82, 83 und 84 von Fig. 2 können dabei entweder durch Leiterzüge 90 auf der tragenden Leiterplatte 11 oder durch eine zweite flexible Leiterplatte, die den Ringkern 30 nicht durchsetzt, ergänzt sein.Instead of looping through the ferrite core, the flexible printed circuit boards 31 and 32 can also penetrate the core in a slightly arcuate manner, as shown in FIG. 5. In this case, for example, the flexible circuit board 89 is on both Sides of the toroidal core 30 with pins 91 to 98 on a supporting circuit board 11 electrically and mechanically attached. The conductor tracks corresponding to 82, 83 and 84 of FIG. 2 can either be supplemented by conductor tracks 90 on the supporting printed circuit board 11 or by a second flexible printed circuit board which does not penetrate the toroidal core 30.

Fig. 6 zeigt schliesslich schematisch eine Halterung 110 für einen vollständigen Impulsübertrager, der sich aus drei koaxial übereinanderliegenden, nahtlosen Ferritkernen 30.1, 30.2 und 30.3 und zwei schleifenförmig gebogenen Wicklungseinheiten, beispielsweise Leiterplatten 31 und 32 der anhand von Fig. 2 beschriebenen Art, zusammensetzt. Die Stifte 112 und 113 der rechten Einheit verbinden in der beschriebenen Art die die Wicklung bildenden Leiterzüge und fixieren die Einheit an der Halterung. Die restlichen Stifte 111 und 114 sind aus der Halterung 110 herausgeführt und dienen als Lötstift zum Verbinden mit der Trägerleiterplatte 11. Die Wicklungseinheit zeigt eine Verlängerung 115, die eine mit den Abschirmschichten der flexiblen Leiterplatte 31 elektrisch verbundene zusätzliche Abschirmschicht aufweist. Diese Verlängerung 115 ist laschenförmig über die Stiftoberenden gebogen und schirmt diese elektrisch ab. Unten übernimmt die Schicht 14 der Trägerleiterplatte 11 die entsprechende Funktion. Hierdurch wird eine weitere Verbesserung der Abschirmeigenschaften erreicht. Für die zweite Wicklungseinheit 32 gilt Entsprechendes.Finally, FIG. 6 shows schematically a holder 110 for a complete pulse transmitter, which is composed of three seamless ferrite cores 30.1, 30.2 and 30.3 which are coaxially one above the other and two loop-shaped winding units, for example printed circuit boards 31 and 32 of the type described with reference to FIG. 2. The pins 112 and 113 of the right-hand unit connect the conductor tracks forming the winding in the manner described and fix the unit to the holder. The remaining pins 111 and 114 are led out of the holder 110 and serve as a soldering pin for connection to the carrier circuit board 11. The winding unit shows an extension 115 which has an additional shielding layer electrically connected to the shielding layers of the flexible circuit board 31. This extension 115 is bent in a lug shape over the pin ends and shields them electrically. At the bottom, the layer 14 of the carrier circuit board 11 takes over the corresponding function. This further improves the shielding properties. The same applies to the second winding unit 32.

Der Windungssinnn der Schleifen der zwei Wicklungseinheiten eines Impulsübertragers kann natürlich entsprechend Fig. 6 gleichsinnig oder in etwas geänderter Geometrie auch gegensinnig sein.The winding sense of the loops of the two winding units of a pulse transformer can, of course, be in the same direction according to FIG. 6 or in opposite directions in somewhat modified geometry.

Impulsübertrager der beschriebenen Art werden beispielsweise verwendet als Trennübertrager zwischen einer elektronischen Schaltungsanordnung und einer Uebertragungsleitung zur Uebertragung schneller digitaler Signale. Die Uebertragungsleitung kann dabei wie in Fig. 1 gezeigt, als Koaxialkabel 20 oder als anderes, für Digitalsignale geeignetes Kabel, beispielsweise eine aus zwei Aderpaaren bestehende Vierdrahtleitung, ausgebildet sein. Auf dieser kann zusätzlich zu den digitalen Signalen in an sich bekannter Weise ein Speisestrom fliessen.Pulse transformers of the type described are used, for example, as isolating transformers between an electronic circuit arrangement and a transmission line for the transmission of fast digital signals. As shown in FIG. 1, the transmission line can be designed as a coaxial cable 20 or as another cable suitable for digital signals, for example a four-wire line consisting of two wire pairs. In addition to the digital signals, a feed current can flow on this in a manner known per se.

Claims (11)

1. Impulsübertrager mit ringförmigem, nahtlos geschlossenem Kern (30) und mit Primär- (31) und Sekundärwicklungen (32), wobei die Windungen der Wicklungen (31, 32) aus länglichen Leitern (82...84) gebildet werden, welche auf flexiblen, plattenförmigen Trägern aus Isoliermaterial parallel nebeneinanderliegend aufgebracht sind,
wobei die Träger samt der Leiter (82...84) durch den Kern (30) gesteckt und schleifenförmig zusammengebogen sind,
und wobei die Enden der Leiter (82...84) elektrisch miteinander verbunden sind,
gekennzeichnet durch folgende Merkmale: - der Träger besteht aus mehreren Lagen, zwischen denen jeweils eine Schicht aus Leitern liegt (Fig. 2); - jeder Leiter (52, 56, 82, 83, 84) weist entweder an einem oder an beiden seiner Enden Anschlusspunkte (70; 88; 77, 79; 76, 80; 75, 81) auf, über die die Leiter (52...) untereinander und mit sonstigen Leitern elektrisch verbindbar sind; - die Leiter (82, 83, 84) mit zwei Anschlusspunkten sind schmaler als die Leiter (52, 56) mit einem Anschlusspunkt und sind so angeordnet, dass sie zum überwiegenden Teil gegen aussen durch die Leiter (52, 56) mit einem Anschlusspunkt überdeckt und damit durch diese elektrisch abgeschirmt sind. 1. Pulse transformer with an annular, seamlessly closed core (30) and with primary (31) and secondary windings (32), the windings of the windings (31, 32) being formed from elongated conductors (82 ... 84), which on flexible, plate-shaped supports made of insulating material are applied in parallel next to each other,
the carriers including the conductors (82 ... 84) being pushed through the core (30) and being bent together in a loop,
and the ends of the conductors (82 ... 84) are electrically connected to one another,
characterized by the following features: - The carrier consists of several layers, between each of which there is a layer of conductors (Fig. 2); - Each conductor (52, 56, 82, 83, 84) has connection points (70; 88; 77, 79; 76, 80; 75, 81) either at one or both of its ends, via which the conductors (52. ..) are electrically connectable with each other and with other conductors; - The conductors (82, 83, 84) with two connection points are narrower than the conductors (52, 56) with one connection point and are arranged such that they are largely covered towards the outside by the conductors (52, 56) with a connection point and are therefore electrically shielded by them. 2. Impulsübertrager nach Anspruch 1,
dadurch gekennzeichnet,
dass die Träger und die Leiter als bandförmige, mehrschichtige, gedruckte Leiterplatte ausgebildet sind (Fig. 2 und 3).2. pulse transmitter according to claim 1,
characterized,
that the carrier and the conductor are designed as a band-shaped, multilayer, printed circuit board (FIGS. 2 and 3). 3. Impulsübertrager nach Anspruch 2,
dadurch gekennzeichnet, - dass die Leiterplatte (Fig. 2) drei Leiterschichten aufweist, - dass die mittlere Leiterschicht mehr als einen Leiter (82, 83, 84) mit zwei Anschlusspunkten aufweist, wobei die Anschlussim wesentlichen punkte (77, 79; 76, 80; 75, 81) der parallel liegenden Leiter (82, 83, 84) in Längsrichtung hintereinander angeordnet sind, - dass die äusseren Leiterschichten je einen Leiter (52, 56) mit einem Anschlusspunkt aufweisen, - und dass diese Leiter (52, 56) Aussparungen (71, 72; 86, 87) aufweisen, die so angeordnet sind, dass die Anschlusspunkte (77...) der Leiter (82, 83, 84) mit zwei Anschlusspunkten un- überdeckt sind. 3. pulse transmitter according to claim 2,
characterized, - That the circuit board (Fig. 2) has three conductor layers, - That the middle conductor layer has more than one conductor (82, 83, 84) with two connection points, the connection essentially points (77, 79; 76, 80; 75, 81) of the parallel conductors (82, 83, 84) are arranged one behind the other in the longitudinal direction, - that the outer conductor layers each have a conductor (52, 56) with a connection point, - And that these conductors (52, 56) have cutouts (71, 72; 86, 87) which are arranged in such a way that the connection points (77 ...) of the conductors (82, 83, 84) with two connection points are covered. 4. Impulsübertrager nach Anspruch 2,
dadurch gekennzeichnet, - dass die Leiterplatte (Fig. 3) zwei Leiterschichten aufweist, - dass jede Leiterschicht wenigstens einen Leiter aufweist, wobei der Leiter (96) der einen Schicht einen und die Leiter (90...93) der anderen Leiters.chicht zwei Anschlusspunkte aufweisen, und - dass die Leiterplatte parallel zu ihrer Längsrichtung derart zusammengefaltet ist, dass der Leiter (96) mit einem Anschlusspunkt die Leiter (90...93) mit zwei Anschlusspunkten im wesentlichen allseitig überdeckt. 4. pulse transmitter according to claim 2,
characterized, - That the circuit board (Fig. 3) has two conductor layers, - that each conductor layer has at least one conductor, the conductor (96) of one layer having one and the conductors (90 ... 93) of the other conductor layer having two connection points, and - That the circuit board is folded parallel to its longitudinal direction in such a way that the conductor (96) with one connection point essentially covers the conductors (90 ... 93) with two connection points on all sides. 5. Impulsübertrager nach Anspruch 3 oder 4,
dadurch gekennzeichnet,
dass die Leiterplatte Anschlusslöcher (60...67) aufweist, in welchen Anschlussstifte (36...39; 46...49) befestigt sind, mittels welcher die Leiter der Leiterplatte untereinander verbunden und mit sonstigen Leitern verbindbar sind (Fig. 1 und 2).5. Pulse transmitter according to claim 3 or 4,
characterized,
that the printed circuit board has connection holes (60 ... 67) in which connecting pins (36 ... 39; 46 ... 49) are fastened, by means of which the conductors of the printed circuit board can be connected to one another and connected to other conductors (Fig. 1 and 2). 6. Impulsübertrager nach Anspruch 5,
dadurch gekennzeichnet, - dass die Leiterplatte so ausgebildet ist, dass sich auf der einen Seite neben den Anschlusslöchern (60...67) und den in diesen befestigten Anschlusstiften (111...114) die Leiterplatten-Schlaufe befindet, - dass sich auf der anderen Seite neben den Anschlusslöchern (60...67) eine Leiterplatten-Verlängerung (115) befindet, die in wenigstens einer Leiterschicht einen Teil eines Leiters mit einem Anschlusspunkt umfasst, - und dass diese Verlängerung als Abschirmung laschenförmig über die offen liegenden einen Stiftenden gebogen ist (Fig. 6). 6. pulse transmitter according to claim 5,
characterized, - that the circuit board is designed so that the circuit board loop is on one side next to the connection holes (60 ... 67) and the connection pins (111 ... 114) fastened in these, - That on the other side next to the connection holes (60 ... 67) there is a printed circuit board extension (115) which in at least one conductor layer comprises part of a conductor with a connection point, - And that this extension is bent as a shield over the exposed one end of the pin (Fig. 6). 7. Impulsübertrager nach Anspruch 1,
dadurch gekennzeichnet, - dass der Träger die Isolierschicht einer einschichtigen, gefalteten Leiterplatte ist, - dass die Leiterschicht der Leiterplatte einen einzigen Anschlusspunkt aufweist, - und dass in dem durch die Faltung entstandenen Innenbereich parallel liegende Isolierdrahtstücke (101, 102, 103) angeordnet sind, deren Enden nach aussen herausgeführt sind (Fig. 4a und 4b). 7. pulse transmitter according to claim 1,
characterized, that the carrier is the insulating layer of a single-layer, folded printed circuit board, that the conductor layer of the circuit board has a single connection point, - And that in the inner area created by the folding parallel lying insulating wire pieces (101, 102, 103) are arranged, the ends of which are led outwards (Fig. 4a and 4b). 8. Impulsübertrager nach Anspruch 1,
dadurch gekennzeichnet,
dass die Anschlusspunkte (70, 88) der Leiter (52, 56) mit einem Anschlusspunkt an sich entsprechenden Enden der Leiter angeordnet sind.8. pulse transmitter according to claim 1,
characterized,
that the connection points (70, 88) of the conductors (52, 56) are arranged with a connection point on ends of the conductors which correspond to one another. 9. Impulsübertrager nach Anspruch 1,
dadurch gekennzeichnet,
dass die Anschlusspunkte (70, 88) der Leiter (52, 56) mit einem Anschlusspunkt an sich nicht entsprechenden Enden ) der Leiter angeordnet sind.9. pulse transmitter according to claim 1,
characterized,
that the connection points (70, 88) of the conductors (52, 56) are arranged with a connection point on ends (not corresponding to themselves) of the conductors. 10. Impulsübertrager nach Anspruch 1,
dadurch gekennzeichnet,
dass sich der Kern aus drei unabhängigen, koaxial angeordneten Ferritkernen (30.1, 30.2, 30.3) zusammensetzt (Fig. 6).10. Pulse transmitter according to claim 1,
characterized,
that the core is composed of three independent, coaxially arranged ferrite cores (30.1, 30.2, 30.3) (FIG. 6). 11. Verwendung des Impulsübertragers nach den vorhergehenden Ansprüchen als Trennübertrager zwischen einer elektronischen Schaltungsanordnung und einer Leitung (20) zur Uebertragung digitaler Signale.11. Use of the pulse transformer according to the preceding claims as an isolating transformer between an electronic circuit arrangement and a line (20) for the transmission of digital signals.
EP81100159A 1980-02-01 1981-01-12 Pulse transformer and its use as isolation transformer Expired EP0033441B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81100159T ATE9419T1 (en) 1980-02-01 1981-01-12 PULSE TRANSMITTER AND ITS USE AS ISOLATION TRANSMITTER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH81480 1980-02-01
CH814/80 1980-02-01

Publications (2)

Publication Number Publication Date
EP0033441A1 true EP0033441A1 (en) 1981-08-12
EP0033441B1 EP0033441B1 (en) 1984-09-12

Family

ID=4195809

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81100159A Expired EP0033441B1 (en) 1980-02-01 1981-01-12 Pulse transformer and its use as isolation transformer

Country Status (6)

Country Link
US (1) US4342976A (en)
EP (1) EP0033441B1 (en)
JP (1) JPS56129305A (en)
AT (1) ATE9419T1 (en)
CA (1) CA1144247A (en)
DE (1) DE3165884D1 (en)

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GB2163908A (en) * 1984-09-01 1986-03-05 Marconi Co Ltd A transformer
US4689593A (en) * 1984-09-01 1987-08-25 The Marconi Company Limited Transformer with balanced transmission lines
US5130662A (en) * 1990-03-12 1992-07-14 Ntp Elektronik A/S Audio signal switching system
WO1995026174A1 (en) * 1994-03-25 1995-10-05 Kao Corporation Disposable diaper
WO2001091143A2 (en) * 2000-05-19 2001-11-29 Harding Philip A Slot core transformers
US6820321B2 (en) 2000-09-22 2004-11-23 M-Flex Multi-Fineline Electronix, Inc. Method of making electronic transformer/inductor devices
US7135952B2 (en) 2002-09-16 2006-11-14 Multi-Fineline Electronix, Inc. Electronic transformer/inductor devices and methods for making same
US7271697B2 (en) 2004-12-07 2007-09-18 Multi-Fineline Electronix Miniature circuitry and inductive components and methods for manufacturing same
US7436282B2 (en) 2004-12-07 2008-10-14 Multi-Fineline Electronix, Inc. Miniature circuitry and inductive components and methods for manufacturing same
US7645941B2 (en) 2006-05-02 2010-01-12 Multi-Fineline Electronix, Inc. Shielded flexible circuits and methods for manufacturing same
EP2388789A3 (en) * 2010-05-19 2012-04-25 Advanced Connection Technology, Inc. Ferrite core coil
US9959967B2 (en) 2014-05-15 2018-05-01 Analog Devices, Inc. Magnetic devices and methods for manufacture using flex circuits
US10141107B2 (en) 2013-10-10 2018-11-27 Analog Devices, Inc. Miniature planar transformer

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US5801602A (en) * 1996-04-30 1998-09-01 3Com Corporation Isolation and signal filter transformer
US6252532B1 (en) 1998-02-26 2001-06-26 3Com Corporation Programmable compensation and frequency equalization for network systems
JP4496508B2 (en) * 1999-03-12 2010-07-07 日立金属株式会社 Toroidal ferrite core
US6040753A (en) * 1999-04-06 2000-03-21 Lockheed Martin Corp. Ultra-low-profile tube-type magnetics
US7009486B1 (en) * 2003-09-18 2006-03-07 Keithley Instruments, Inc. Low noise power transformer
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US7990246B2 (en) * 2005-09-20 2011-08-02 Scandinova Systems Ab Foil winding pulse transformer
US9190204B1 (en) 2013-05-12 2015-11-17 Marion Harlan Cates, Jr. Multilayer printed circuit board having circuit trace windings
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Cited By (24)

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EP0153808A1 (en) * 1984-02-07 1985-09-04 The Marconi Company Limited Transformers
GB2163908A (en) * 1984-09-01 1986-03-05 Marconi Co Ltd A transformer
US4689593A (en) * 1984-09-01 1987-08-25 The Marconi Company Limited Transformer with balanced transmission lines
US5130662A (en) * 1990-03-12 1992-07-14 Ntp Elektronik A/S Audio signal switching system
WO1995026174A1 (en) * 1994-03-25 1995-10-05 Kao Corporation Disposable diaper
WO2001091143A3 (en) * 2000-05-19 2002-03-28 Philip A Harding Slot core transformers
US7477124B2 (en) 2000-05-19 2009-01-13 Multi-Fineline Electronix, Inc. Method of making slotted core inductors and transformers
US6674355B2 (en) 2000-05-19 2004-01-06 M-Flex Multi-Fineline Electronix, Inc. Slot core transformers
US6796017B2 (en) 2000-05-19 2004-09-28 M-Flex Multi-Fineline Electronix, Inc. Slot core transformers
US7178220B2 (en) 2000-05-19 2007-02-20 Multi-Fineline Electronix, Inc. Method of making slotted core inductors and transformers
WO2001091143A2 (en) * 2000-05-19 2001-11-29 Harding Philip A Slot core transformers
US6820321B2 (en) 2000-09-22 2004-11-23 M-Flex Multi-Fineline Electronix, Inc. Method of making electronic transformer/inductor devices
US7135952B2 (en) 2002-09-16 2006-11-14 Multi-Fineline Electronix, Inc. Electronic transformer/inductor devices and methods for making same
US7277002B2 (en) 2002-09-16 2007-10-02 Multi-Fineline Electronix, Inc. Electronic transformer/inductor devices and methods for making same
US7696852B1 (en) 2002-09-16 2010-04-13 Multi-Fineline Electronix, Inc. Electronic transformer/inductor devices and methods for making same
US7271697B2 (en) 2004-12-07 2007-09-18 Multi-Fineline Electronix Miniature circuitry and inductive components and methods for manufacturing same
US7602272B2 (en) 2004-12-07 2009-10-13 Multi-Fineline Electronix, Inc. Miniature circuitry and inductive components and methods for manufacturing same
US7656263B2 (en) 2004-12-07 2010-02-02 Multi-Fineline Electronix, Inc. Miniature circuitry and inductive components and methods for manufacturing same
US7690110B2 (en) 2004-12-07 2010-04-06 Multi-Fineline Electronix, Inc. Methods for manufacturing miniature circuitry and inductive components
US7436282B2 (en) 2004-12-07 2008-10-14 Multi-Fineline Electronix, Inc. Miniature circuitry and inductive components and methods for manufacturing same
US7645941B2 (en) 2006-05-02 2010-01-12 Multi-Fineline Electronix, Inc. Shielded flexible circuits and methods for manufacturing same
EP2388789A3 (en) * 2010-05-19 2012-04-25 Advanced Connection Technology, Inc. Ferrite core coil
US10141107B2 (en) 2013-10-10 2018-11-27 Analog Devices, Inc. Miniature planar transformer
US9959967B2 (en) 2014-05-15 2018-05-01 Analog Devices, Inc. Magnetic devices and methods for manufacture using flex circuits

Also Published As

Publication number Publication date
JPS56129305A (en) 1981-10-09
CA1144247A (en) 1983-04-05
JPS6335089B2 (en) 1988-07-13
ATE9419T1 (en) 1984-09-15
DE3165884D1 (en) 1984-10-18
EP0033441B1 (en) 1984-09-12
US4342976A (en) 1982-08-03

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