FR2520154A1 - Current-controlled variable self-inductor for filter circuit - consists of two-half permeable core whose flux level is controlled by external field - Google Patents

Current-controlled variable self-inductor for filter circuit - consists of two-half permeable core whose flux level is controlled by external field Download PDF

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Publication number
FR2520154A1
FR2520154A1 FR8200683A FR8200683A FR2520154A1 FR 2520154 A1 FR2520154 A1 FR 2520154A1 FR 8200683 A FR8200683 A FR 8200683A FR 8200683 A FR8200683 A FR 8200683A FR 2520154 A1 FR2520154 A1 FR 2520154A1
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France
Prior art keywords
parts
magnetic
excitation
inductor
variable self
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Granted
Application number
FR8200683A
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French (fr)
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FR2520154B1 (en
Inventor
Dominique Bourdarias
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Telecommunications Radioelectriques et Telephoniques SA TRT
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Telecommunications Radioelectriques et Telephoniques SA TRT
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Priority to FR8200683A priority Critical patent/FR2520154A1/en
Publication of FR2520154A1 publication Critical patent/FR2520154A1/en
Application granted granted Critical
Publication of FR2520154B1 publication Critical patent/FR2520154B1/fr
Granted 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
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/14—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias
    • H01F29/146—Constructional details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F21/00—Variable inductances or transformers of the signal type
    • H01F21/02—Variable inductances or transformers of the signal type continuously variable, e.g. variometers
    • H01F21/08—Variable inductances or transformers of the signal type continuously variable, e.g. variometers by varying the permeability of the core, e.g. by varying magnetic bias

Abstract

The device is intended for filter circuits and uses an electrical method of inductance variation rather than a manual one. The inductor coil (1) is wound on a cylindrical part (4) which is an integral part of a plate (5a) made from a magnetically permeable material. Two similar plates (5a,5b) have rims (6a,6b,7a,7b) which align so that they form two halves of a magnetic circuit. The magnetic circuit so formed is positioned between and in contact with, the pole-pieces (12a, 13a, 12b, 13b) of a two-yoke electromagnet. Coils (30a,30b) are wound on each half of the electromagnet core. When the electromagnet is energised by a direct current, a flux-loop is established in the inner magnetic circuit. Current from the input signal to the inductor sets up flux which lies in the same path as that established by the electromagnet. The permeability, and hence the self inductance of the inductor, is variable according to the electromagnet current. The devices is also described in a cylindrical form where standard ferrite inductor cores and pots are used.

Description

DISPOSITIF DE SELF-INDUCTANCE VARIABLE
La présente invention concerne un dispositif de seifinductance variable constitué par une bobine faite sur un support en matériau magnétique disposé dans un circuit magnétique d'excitation pour faire varier sa perméabilité.VARIABLE SELF-INDUCTANCE DEVICE
The present invention relates to a variable seifinductance device constituted by a coil made on a support made of magnetic material arranged in a magnetic excitation circuit to vary its permeability.

Un tel dispositif, en coopération avec un condensateur, peut constituer un filtre passe-bande dont il est facile de champ ger L'accord en faisant varier l'excitation du circuit magnétique, ce qui peut être fait par exemple au moyen d'un courant traversant un enroulement faisant partie du circuit magnétique d'excitation. Si les signaux à filtrer sont à fort niveau, il n'est pas possible d'utiliser comme élément de changement d'accord une diode à capacité variable. Such a device, in cooperation with a capacitor, can constitute a band-pass filter which is easy to manage. Tuning by varying the excitation of the magnetic circuit, which can be done for example by means of a current crossing a winding forming part of the magnetic excitation circuit. If the signals to be filtered are at high level, it is not possible to use as a chord change element a variable capacitance diode.

Un dispositif de self-inductance variable peut être formé par un pot en ferrite qui constitue ledit support et par un circuit magnétique qui polarise ce pot pour faire varier sa perméabilité. On pourra, à ce sujet, consulter le brevet fran çais d'invention nO 2 205 718. A variable self-inductance device can be formed by a ferrite pot which constitutes said support and by a magnetic circuit which polarizes this pot to vary its permeability. On this subject, one can consult the French patent for invention No. 2 205 718.

Ce que l'on souhaite obtenir, avec ce genre de dispositif, est une grande variation de la valeur de la self-inductance. La présente invention propose donc un dispositif qui réponde à ce souhait. What we want to achieve with this kind of device is a large variation in the value of the self-inductance. The present invention therefore provides a device which meets this wish.

Pour cela, un dispositif du genre mentionné dans le préambule est remarquable en ce que le circuit magnétique d'excitation est formé en deux parties dont chacune présente sur un côté au moins deux pôles, tandis que le support magnétique est placé entre les pales de ces deux parties, les pôles en vis-à-vis ayant des noms différents .(nord ou sud). For this, a device of the kind mentioned in the preamble is remarkable in that the magnetic excitation circuit is formed in two parts, each of which has on one side at least two poles, while the magnetic support is placed between the blades of these two parts, the opposite poles with different names (north or south).

La description suivante faite en regard des dessins annexés, le tout donné à titre d'exemple non limitatif, fera bien comprendre comment l'invention peut être réalisée. The following description given with reference to the appended drawings, all given by way of nonlimiting example, will make it clear how the invention can be implemented.

La figure 1 représente en vue éclatée un premier mode de réalisation d'un dispositif de self-inductance conforme à l'invention. Figure 1 shows in exploded view a first embodiment of a self-inductance device according to the invention.

La figure 2 représente une vue en coupe du dispositif montré à la figure 1. FIG. 2 represents a sectional view of the device shown in FIG. 1.

La figure 3 représente une vue éclatée d'un mode de réalisation préféré de l'invention. Figure 3 shows an exploded view of a preferred embodiment of the invention.

La figure 4 représente une vue en coupe du dispositif montré à La figure 1. FIG. 4 represents a sectional view of the device shown in FIG. 1.

Le dispositif de l'invention montré à la figure 1 en vue éclatée comporte une bobine 1 présentant deux extrémités 2 et 3 à partir desquelles on considère la self-inductance ; le noyau 4 de cette bobine est inséré dans un pot constitué de deux coupelles 5a et 5b de forme rectangulaire ; ces coupelles 5a et 5b sont munies de rebords 6a et 7a, pour la première, et 6b et 7b, pour la deuxième, de sorte que lorsqu'on veut former le pot, les coupelles 7a et 7b se rejoignent en s'appuyant sur ces rebords ; les rebords 6a et 7a viennent alors en contact avec respectivement les rebords 6b et 7b. Le noyau 4 et les coupelles 7a et 7b sont faits en un même matériau dont on se.propose de faire varier, au moyen d'un circuit magnétique d'excitation, la perméabilité et, de là, la self-inductance, mesurée aux extrémités 2 et 3. The device of the invention shown in Figure 1 in exploded view comprises a coil 1 having two ends 2 and 3 from which the self-inductance is considered; the core 4 of this coil is inserted into a pot consisting of two cups 5a and 5b of rectangular shape; these cups 5a and 5b are provided with flanges 6a and 7a, for the first, and 6b and 7b, for the second, so that when one wants to form the pot, the cups 7a and 7b meet by pressing on these ledges; the edges 6a and 7a then come into contact with the edges 6b and 7b respectively. The core 4 and the cups 7a and 7b are made of the same material which it is proposed to vary, by means of a magnetic excitation circuit, the permeability and, from there, the self-inductance, measured at the ends 2 and 3.

Conformément à l'invention, le circuit magnétique dtexcitation est formé de deux parties 1Oa et lOb ayant la forme de U, de sorte que chacune des parties lOa et lOb présente deux pôles 12a et 13a pour la partie 1Oa et 12b et 13b pour. la partie lOb ; le pot formé des coupelles 5a et 5b est placé entre les pôles 12a, 12b, 13a et 13b des deux parties 10a et lOb ; les pôles en vis-à-vis ont des noms différents : par exemple, en se reportant à la figure 2, le pôle 12a est un pôle sud, le pôle 12b un pôle nord, le pôle 13a un pôle nord et le pôle 13b un pôle sud ; les pôles en vis-à-vis, les pôles 12a et 12b, d'une part, et les pôles 13a et 13b sont respectivement des pôles sud et nord et des pôles nord et sud. According to the invention, the magnetic excitation circuit is formed by two parts 10a and 10b having the shape of U, so that each of the parts 10a and 10b has two poles 12a and 13a for the part 10a and 12b and 13b for. part lOb; the pot formed by the cups 5a and 5b is placed between the poles 12a, 12b, 13a and 13b of the two parts 10a and 10b; the opposite poles have different names: for example, referring to figure 2, the pole 12a is a south pole, the pole 12b a north pole, the pole 13a a north pole and the pole 13b a South Pole ; the facing poles, the poles 12a and 12b, on the one hand, and the poles 13a and 13b are respectively south and north poles and north and south poles.

A la figure 2, on a représente par des flèches 20, 21, 22 et 23 le sens du champ magnétique créé par cet agencement de pôles à l'intérieur du pot. La ligne en pointillé 25 représente les lignes de champ créées par les signaux alternatifs appliqués aux extrémités 2 et 3 de la bobine 1. On se rend compte que les trajets des champs magnétiques créés par l'agencement de pôles et par ces signaux alternatifs ont un grand parcours en commun, de sorte qu'un changement de champ créé par les pôles a une grande répercussion sur la valeur de la self-inductance. In Figure 2, there is shown by arrows 20, 21, 22 and 23 the direction of the magnetic field created by this arrangement of poles inside the pot. The dotted line 25 represents the field lines created by the alternating signals applied to the ends 2 and 3 of the coil 1. We realize that the paths of the magnetic fields created by the arrangement of poles and by these alternating signals have a great journey in common, so that a change of field created by the poles has a big impact on the value of self-inductance.

L'agencement de pôles est obtenu au. moyen de deux enroulements d'excitation 30a et 30b disposés respectivement sur les parties îOa et lOb. Les parties 10a et lOb sont en fer doux tandis que le matériau magnétique constituant les coupelles 5a et 5b et le noyau 4 sont en ferrite d'une qualité correspondant à la fréquence des signaux à appliquer aux extrémités 2 et 3 de la bobine 1. The arrangement of poles is obtained at. by means of two excitation windings 30a and 30b disposed respectively on the parts îOa and lOb. The parts 10a and 10b are made of soft iron while the magnetic material constituting the cups 5a and 5b and the core 4 are made of ferrite of a quality corresponding to the frequency of the signals to be applied to the ends 2 and 3 of the coil 1.

Le dispositif conforme à l'invention montré en vue éclatée à la figure 3, présente une forme avantageuse qui permet d'utiliser des pots standard en ferrite. Sur cette figure, les éléments communs avec ceux des figures précédentes portent les mêmes références. Le pot en ferrite est formé des coupelles 5a et 5b de forme cylindrique, le noyau 4 fait partie intégrante de ces coupelles et la figure 3 n'en montre qu'une partie portant la référence 4b. The device according to the invention shown in exploded view in Figure 3, has an advantageous shape which allows the use of standard ferrite pots. In this figure, the elements common with those of the previous figures have the same references. The ferrite pot is formed of cups 5a and 5b of cylindrical shape, the core 4 is an integral part of these cups and Figure 3 shows only a part bearing the reference 4b.

Le circuit d'excitation (1Oa, lOb) est aussi de forme cylindrique de façon à épouser le contour du pot ; les enroulements d'excitation sont disposés autour des jambes (50a, 50b) placées dans l'axe du cylindre.  The excitation circuit (10a, 10b) is also of cylindrical shape so as to follow the outline of the pot; the excitation windings are arranged around the legs (50a, 50b) placed in the axis of the cylinder.

il convient de remarquer, d'une part, que les jambes 50a et 50b présentent une profubérance 51a et 51b qui pénètre dans un trou 53 placé au centre du pot et, d'autre part, que les circuits magnétiques cylindriques 10a et lOb présentent un décrochement 55a ef 55b dans lequel vient se bloquer te pot. it should be noted, on the one hand, that the legs 50a and 50b have a depth 51a and 51b which penetrates into a hole 53 placed in the center of the pot and, on the other hand, that the cylindrical magnetic circuits 10a and 10b have a offset 55a and 55b in which the pot is blocked.

Ces décrochements et protubérances facilitent le passage dans le ferrite du pot, du champ magnétique de polarisation fourni par le circuit d'excitation.These recesses and protrusions facilitate the passage through the ferrite of the pot, of the polarizing magnetic field provided by the excitation circuit.

La Demanderesse a également découvert que deux rondelles de cuivre 61a et 61b plaquées de part et d'autre du pot améliorent, en faisant office de blindage par rapport au circuit magnétique d'excitation, le coefficient de qualité de la self-inductance présentée aux extrémités 2 et 3 de la bobine 1. The Applicant has also discovered that two copper washers 61a and 61b plated on either side of the pot improve, by acting as shielding with respect to the magnetic excitation circuit, the quality coefficient of the self-inductance presented at the ends 2 and 3 of coil 1.

Un capot 70, avec un trou de passage 71 pour les différentes extrémités de la bobine 1 et d'enroulement d'excitation 30a et 30b,maintient les différentes pièces constituant le dispositif de l'invention. A cover 70, with a through hole 71 for the different ends of the coil 1 and of the excitation winding 30a and 30b, holds the different parts constituting the device of the invention.

Claims (6)

REVENDICATIONS :CLAIMS: 1. Dispositif de self-inductance variable constitué par une bobine faite sur un support en matériau magnétique disposé dans un circuit magnétique d'excitation pour faire varier sa perméabilité, caractérisé en ce que le circuit magnétique d'excitation est formé en deux parties dont chacune présente sur un comté au moins deux pôles tandis que le support magnétique est placé entre les pôles de ces deux parties, Les pôles en vis-à-vis ayant des noms différents (nord ou sud).1. Variable self-inductance device consisting of a coil made on a support made of magnetic material placed in a magnetic excitation circuit to vary its permeability, characterized in that the magnetic excitation circuit is formed in two parts, each of which presents on a county at least two poles while the magnetic support is placed between the poles of these two parts, The opposite poles having different names (north or south). 2. Dispositif de self-inductance variable selon La revendication 1, caractérisé en ce qu il est prévu pour créer des pôles en vis-à-vis ayant des noms différents deux enroulements d'excitation placés chacun dans l'une des parties du circuit d'excitation.2. Variable self-inductance device according to claim 1, characterized in that it is intended to create facing poles having different names two excitation windings each placed in one of the parts of the circuit d 'excitation. 3. Dispositif de self-inductance variable selon la revendication 1 ou 2, caractérisé en ce que les parties d'excitation ont la forme de U, tandis que le support magnétique se présente sous la forme d'un pot muni de coupelles de forme rectangulaire pour que les extrémités des parties d'excitation puissent venir en contact avec ces coupelles.3. Variable self-inductance device according to claim 1 or 2, characterized in that the excitation parts have the shape of a U, while the magnetic support is in the form of a pot provided with cups of rectangular shape so that the ends of the excitation parts can come into contact with these cups. 4. Dispositif de self-inductance variable selon la revendication 1 ou 2, caractérisé en ce que Les parties d'excitation sont de forme cylindrique et comportent une jambe au centre tandis que le support magnétique se présente sous la forme d'un pot cylindrique pour que les parties d'excitation puissent épouser son contour.4. Variable self-inductance device according to claim 1 or 2, characterized in that the excitation parts are cylindrical in shape and have one leg in the center while the magnetic support is in the form of a cylindrical pot for that the excitation parts can follow its outline. 5. Dispositif de self-inductance variable selon la revendication 4, caractérisé en ce que les jambes présentent une protubérance destinée à pénétrer dans un trou central du pot, tandis que le pourtour des parties du circuit magnétique d'excitation comporte un décrochement sur lequel vient s'encastrer le pourtour du pot. 5. Variable self-inductance device according to claim 4, characterized in that the legs have a protuberance intended to penetrate a central hole of the pot, while the periphery of the parts of the magnetic excitation circuit comprises a recess on which comes fit around the edge of the pot. 6. Dispositif de self-inductance variable selon l'une des revendications 1 à 5, caractérisé en ce que le support magnétique est blindé par rapport au circuit magnétique d'excitation par une feuille d'un matériau conducteur, notamment du cuivre. 6. Variable self-inductance device according to one of claims 1 to 5, characterized in that the magnetic support is shielded with respect to the magnetic excitation circuit by a sheet of a conductive material, in particular copper.
FR8200683A 1982-01-18 1982-01-18 Current-controlled variable self-inductor for filter circuit - consists of two-half permeable core whose flux level is controlled by external field Granted FR2520154A1 (en)

Priority Applications (1)

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FR8200683A FR2520154A1 (en) 1982-01-18 1982-01-18 Current-controlled variable self-inductor for filter circuit - consists of two-half permeable core whose flux level is controlled by external field

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FR8200683A FR2520154A1 (en) 1982-01-18 1982-01-18 Current-controlled variable self-inductor for filter circuit - consists of two-half permeable core whose flux level is controlled by external field

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FR2520154A1 true FR2520154A1 (en) 1983-07-22
FR2520154B1 FR2520154B1 (en) 1984-02-24

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2324634A (en) * 1940-12-31 1943-07-20 Harold J Mccreary Electromagnetic inductance apparatus
US2762020A (en) * 1953-04-07 1956-09-04 Helipot Corp Variable inductor
US3701067A (en) * 1971-01-28 1972-10-24 Denki Onkyo Co Ltd Saturable reactor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2324634A (en) * 1940-12-31 1943-07-20 Harold J Mccreary Electromagnetic inductance apparatus
US2762020A (en) * 1953-04-07 1956-09-04 Helipot Corp Variable inductor
US3701067A (en) * 1971-01-28 1972-10-24 Denki Onkyo Co Ltd Saturable reactor

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