EP0077240B1 - Aus gedrucktem Folienband gebildete Induktionsspule und Sender mit solcher Spule - Google Patents

Aus gedrucktem Folienband gebildete Induktionsspule und Sender mit solcher Spule Download PDF

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Publication number
EP0077240B1
EP0077240B1 EP19820401758 EP82401758A EP0077240B1 EP 0077240 B1 EP0077240 B1 EP 0077240B1 EP 19820401758 EP19820401758 EP 19820401758 EP 82401758 A EP82401758 A EP 82401758A EP 0077240 B1 EP0077240 B1 EP 0077240B1
Authority
EP
European Patent Office
Prior art keywords
inductance
cylinder
ring
cursor
axis
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.)
Expired
Application number
EP19820401758
Other languages
English (en)
French (fr)
Other versions
EP0077240A1 (de
Inventor
Albert Boubouleix
Jacques Hermann
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0077240A1 publication Critical patent/EP0077240A1/de
Application granted granted Critical
Publication of EP0077240B1 publication Critical patent/EP0077240B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type
    • H01F17/0006—Printed inductances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/06—Variable transformers or inductances not covered by group H01F21/00 with current collector gliding or rolling on or along winding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/003—Printed circuit coils
    • 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
    • H01F2017/004—Printed inductances with the coil helically wound around an axis without a core
    • 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
    • H01F2017/006—Printed inductances flexible printed inductors

Definitions

  • the invention relates to an inductor mainly used in circuits tuned on medium power transmitters.
  • Such inductances are usually produced by winding a conductor according to a helix defined by its pitch and its number of turns drawn on a generator cylinder.
  • this variation can be ensured by leaps, by switching taps arranged along the propeller, which makes it possible to change the number of turns contributing to the value of the inductor.
  • the transmitter has a remote control or an automatic tuning system
  • a continuous variation of the inductance value is necessary.
  • this variation is obtained by the displacement of the fulcrum of a cursor on the conductor by a screwing movement around the axis of the propeller.
  • the cursor is usually placed inside the propeller. It is in mechanical and electrical connection with a rotary conductor arranged along the axis of the propeller, on which it can move longitudinally.
  • a motor rotates the axial conductor, which causes the desired variation in the inductance.
  • Such devices have electrical drawbacks such as the presence in series of three friction contacts, one on the cursor in contact with the helical conductor, a second allowing sliding on the rotating axial conductor, a third to ensure the connection of this axial conductor with the fixed elements of the circuits associated with the device.
  • the unused turns of the propeller have a "dead end" effect capable of creating parasitic resonances.
  • the object of the invention is to overcome the aforementioned drawbacks.
  • the subject of the invention is an inductor comprising a conductor forming a cylindrical helix, the conductor being constituted by a ribbon printed on the surface of an insulating cylinder, characterized in that it is made variable by sliding along the axis of the insulating cylinder of a slider comprising at least one ring of contacts mounted on a conductive ring of diameter slightly greater than that of the cylinder.
  • Fig. 1 represents a flexible support surface 1 printed on which inclined copper strips 2 are obtained by implementing a known technique for manufacturing printed circuits consisting, for example, of attacking by chemical means the surface parts left free between the copper bands, after screen printing of the drawing representing the bands, using a protective ink.
  • the winding of the support 1 on an insulating cylinder 3, shown in FIG. 2, superimpose lines A and B in fig. 1, which restores the continuity of the helical conductor.
  • This continuity is materially produced along a strip C which extends the width of the support beyond the line A and which constitutes an overlap zone after winding of the support on the insulating cylinder 3.
  • Fig. 3 shows in section the elements which ensure, in this overlap zone, the electrical continuity at a copper strip 2 of the printed support and the mechanical fixing of this flexible support on the insulating cylinder 3.
  • the flexible support 1 used is a double-sided circuit.
  • the copper-colored parts of the first face form the turns 2 of the inductance.
  • the copper-colored part of the second face is limited to the facing surfaces with the copper-colored parts of the first face at the level of the covering strip C, in order to constitute fixing zones by welding with the corresponding copper-colored parts of the first face, in order to '' ensure the mechanical strength and facilitate the wetting, by welding, of rivets 4 ensuring electrical continuity.
  • This process results in the construction of an inductor of fixed value and usable as it is.
  • This inductance is made adjustable by the installation of a slider according to FIG. 4.
  • This cursor consists of a copper ring 5 with a diameter slightly greater than that of the printed cylinder.
  • a crown, 6 and 7 composed of about fifty elastic contacts pressing on the cylinder along a circumference located in a plane perpendicular to the axis of the cylinder.
  • These crowns are made of beryllium bronze from a band 8 in FIG. 5 cut into the shape of a comb with wide teeth 9.
  • each teeth are then preformed so that each forms one of the contacts of a crown, the latter being made up of a length of strip, fixed, using rivets, by its unformed part, at one end of the slider ring, over the entire length of its internal circumference.
  • a crown being made up of a length of strip, fixed, using rivets, by its unformed part, at one end of the slider ring, over the entire length of its internal circumference.
  • One of these crowns 6 ensures the connection between the cursor ring and the printed turns, by a number of contacts in parallel which is all the higher the larger the width of the printed part and the narrower the space between turns.
  • the ring is dimensioned in length so that short-circuit, via the two crowns mounted at its ends, the unused turns, whatever its position between those giving the maximum and minimum values of the inductance.
  • the width and the pitch of the helical conductor can vary the along the cylinder.
  • the conductive strips 2 of FIG. 1 represent an example of this improvement.
  • the increase in the width of the conductive strip in the region which remains alone used at low inductance values allows the improvement of the inductance overvoltage for these low values.
  • the increased surface of the copper in this region allows an improved evacuation of the calories due to the high frequency losses of the device, these losses being concentrated on the only turns remaining used for the low inductance values.
  • the variation in the pitch of the helix formed by the conductive strip also makes it possible to improve the device by choosing an optimized law of variation of the inductance as a function of the movement of the ring along the printed cylinder.
  • the electrical connection, between the cursor ring and the fixed elements of the circuits associated with the inductance, is provided by a wiper 10 in FIG. 4, integral with the ring, which establishes permanent contact with a silver brass rail 11 disposed parallel to the axis of the insulating cylinder.
  • Fig. 6 shows the inductance terminated with the drive means of the slider ring.
  • the printed support 1 the helical drawing 2
  • the cursor ring 5 the contact rings 6 and 7.
  • the positions of the cursor 10 and of the rail 11 are recalled in the middle of the ring.
  • the sliding of the slider ring along the cylinder carrying the printed inductance is ensured by two threaded rods 12, 13 arranged parallel and symmetrically with respect to the axis of the printed cylinder.
  • These rods have a thread consisting of a square section groove whose pitch is determined according to the friction and the desired speed of movement of the ring.
  • These rods act by screwing in a balanced manner on two nuts 14, 15 made integral with the ring using insulating spacers 16,17.
  • the rotation of the rods is ensured by gears 18, 19 integral with these rods and placed in a plane perpendicular to the axis of the cylinder printed at the end thereof.
  • These gears are themselves driven synchronously by an intermediate gear 20, itself driven by a servo motor not shown in the figure.
  • the symmetrical action of the ring drive system allows precise positioning of the ring during changes in inductance value while maintaining the coincidence of its axis and that of the printed cylinder. This avoids any jamming effect and excessive crushing of the crown contacts, which could result from an asymmetrical drive of the ring.
  • variable inductance which has just been described is particularly applicable to the tuning circuits of the transmitters.
  • a maximum value of 111 lH is obtained with 22 turns printed on a cylinder with a diameter of 70 mm and a length of 280 mm.
  • the admissible current is 10 A with an overvoltage coefficient greater than 200.
  • the resulting dissipated power is approximately 15 W.
  • the printed circuit used to obtain these performances has a copper thickness greater than 1 00 Il.
  • the mechanical drive described allows a positioning time of less than 1.5 s.
  • the invention is not limited to the embodiment precisely described and produced.
  • various techniques of printed circuits can provide alternative embodiments.
  • the use, for example, of metallized holes can eliminate the use of rivets on the overlap zone C of FIG. 3.
  • the support cylinder may in another variant be made of insulating material treated to receive, directly by copper metallization, the design of the inductor according to the known screen printing process, this avoiding the winding operation described above.
  • the electrical connection of the slider ring to the fixed elements of the associated circuits by means of the wiper 10 and the rail 11 can be replaced in another variant embodiment by a semi-rigid connection such as a copper strip, which eliminates a friction contact if the mechanical and electrical stabilities are deemed sufficient.
  • the embodiment then presents only one contact by friction in series with the inductor.

Landscapes

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

Claims (6)

1. Induktanz mit einem eine Zylinderhelix bildenden Leiter, der aus einem auf die zylindrische Oberfläche eines Isolierzylinders (3) aufgedruckten Band (1) besteht, dadurch gekennzeichnet, dass sie durch Gleiten eines Läufers (5) entlang der Achse des Isolierzylindersvariabel gemacht ist, wobei der Läufer mindestens eine Kontaktkrone (6) aufweist, die auf einem leitenden Ring (5) angebracht ist, dessen Durchmesser geringfügig grösser als der des Zylinders ist.
2. Induktanz nach Anspruch 1, dadurch ge-. kennzeichnet, dass der Ring an jedem seiner Enden mit einer Krone (6, 7) versehen ist und dass seine Länge so gewählt ist, dass er mit den Kronen einen Kurzschluss für die nicht genutzten Spiralen des schraubenförmigen Bandes bildet, ganz gleich, wie die Position des Ringes ist.
3. Induktanz nach Anspruch 2, dadurch gekennzeichnet, dass das schraubenförmige Band entlang dem Zylinder von unterschiedlicher Breite ist, wobei die Windungen, die die nahe ihrem Minimalwert eingestellte Induktanz bilden, die Spiralen mit der grössten Breite sind.
4. Induktanz nach einem der Ansprüche 2 oder 3, dadurch gekennzeichnet, dass das schraubenförmige Band eine veränderliche Steigung entlang dem Zylinder aufweist.
5. Induktanz nach Anspruch 4, dadurch gekennzeichnet, dass sie Mittel zum gleichmässigen Antrieb des Läuferrings aufweist, die zwei Gewindestangen (12,13) enthalten, welche parallel und symmetrisch in bezug auf die Achse des Zylinders angeordnet sind, auf die zwei mit dem Läuferring (5) fest verbundene Muttern (14, 15) aufgeschoben sind, wobei diese beiden frei drehbaren Stangen fest mit zwei Zahnradgetrieben (18, 19) verbunden sind, die am Ende des Zylinders in einer zur Achse des Zylinders senkrechten Ebene angeordnetsind, wobei diese Zahnradgetriebe untereinander durch ein drittes Zwischen-Zahnradgetriebe gekoppelt sind, das selbst an einen Nachführungsmotor gekoppelt ist.
6. Emitter, dadurch gekennzeichnet, dass er mindestens eine Induktanz nach einem dervorstehenden Ansprüche aufweist.
EP19820401758 1981-10-06 1982-09-28 Aus gedrucktem Folienband gebildete Induktionsspule und Sender mit solcher Spule Expired EP0077240B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8118786 1981-10-06
FR8118786A FR2514190B1 (fr) 1981-10-06 1981-10-06 Inductance a ruban imprime et emetteur comportant une telle inductance

Publications (2)

Publication Number Publication Date
EP0077240A1 EP0077240A1 (de) 1983-04-20
EP0077240B1 true EP0077240B1 (de) 1985-08-14

Family

ID=9262787

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820401758 Expired EP0077240B1 (de) 1981-10-06 1982-09-28 Aus gedrucktem Folienband gebildete Induktionsspule und Sender mit solcher Spule

Country Status (3)

Country Link
EP (1) EP0077240B1 (de)
DE (1) DE3265438D1 (de)
FR (1) FR2514190B1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3618122A1 (de) * 1986-05-30 1987-12-03 Johann Leonhard Huettlinger Abgleichbare filterspule
FR2659484A1 (fr) * 1990-03-12 1991-09-13 Alcatel Cable Inductance variable.
WO2009111165A1 (en) * 2008-02-18 2009-09-11 Advanced Magnet Lab, Inc. Helical coil design and process for direct fabrication from a conductive layer
CN101425358B (zh) * 2008-08-08 2011-01-05 西安交通大学 雷电流波形形成电感
CA2758831C (en) * 2009-04-16 2015-06-23 Siemens Aktiengesellschaft Winding and method for producing a winding

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB674108A (de) * 1900-01-01
ES138162A1 (es) * 1934-07-24 1935-08-16 R S N V Machinerieen En App N Transformador regulador
NL237742A (de) * 1958-04-03
DE1111682B (de) * 1959-11-11 1961-07-27 Philips Patentverwaltung Abstimmanordnung mit einer etwa kreisfoermig ausgebildeten Leitung
FR1349306A (fr) * 1962-11-30 1964-01-17 Dispositif de connexions mobiles entre deux enroulements électriques fixes
CH447377A (de) * 1964-12-16 1967-11-30 Frako Kondensator Apparate Wicklung für Spulen in elektrischen Maschinen und Geräten
GB1336592A (en) * 1971-07-12 1973-11-07 Denton J Ltd Electrical coils and methods of making same
DE2205045A1 (de) * 1972-02-03 1973-08-09 Wilhelm Dr Ing Lepper Spulen fuer gleich- oder wechselstrom
US4045786A (en) * 1974-09-03 1977-08-30 Honeywell Information Systems Inc. Magnetic domain memory device having an improved drive coil arrangement
JPS5545987B2 (de) * 1974-10-02 1980-11-20
DE2520934C3 (de) * 1975-05-10 1982-07-08 Blaupunkt-Werke Gmbh, 3200 Hildesheim Gedruckte Spule
DE2643657C3 (de) * 1976-09-28 1979-09-06 Siemens Ag, 1000 Berlin Und 8000 Muenchen Elektrische Hochfrequenzspule mit stufenlos veränderbarer Induktivität
FR2379891A1 (fr) * 1977-02-03 1978-09-01 Videon Sa Element de bobinage pour transformateurs

Also Published As

Publication number Publication date
EP0077240A1 (de) 1983-04-20
FR2514190B1 (fr) 1988-06-17
FR2514190A1 (fr) 1983-04-08
DE3265438D1 (en) 1985-09-19

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