FR2469027A1 - Ignition coil with controllable inductance and capacitance - has magnetic material round secondary to increase leakage reactance and isolated metal sheath to increase capacitance to earth - Google Patents

Ignition coil with controllable inductance and capacitance - has magnetic material round secondary to increase leakage reactance and isolated metal sheath to increase capacitance to earth Download PDF

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Publication number
FR2469027A1
FR2469027A1 FR7914265A FR7914265A FR2469027A1 FR 2469027 A1 FR2469027 A1 FR 2469027A1 FR 7914265 A FR7914265 A FR 7914265A FR 7914265 A FR7914265 A FR 7914265A FR 2469027 A1 FR2469027 A1 FR 2469027A1
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France
Prior art keywords
magnetic
capacitance
high voltage
increase
secondary winding
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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.)
Withdrawn
Application number
FR7914265A
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French (fr)
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to FR7914265A priority Critical patent/FR2469027A1/en
Publication of FR2469027A1 publication Critical patent/FR2469027A1/en
Withdrawn legal-status Critical Current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
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/16—Toroidal transformers
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/361—Electric or magnetic shields or screens made of combinations of electrically conductive material and ferromagnetic material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P3/00—Other installations
    • F02P3/005—Other installations having inductive-capacitance energy storage
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/321—Insulating of coils, windings, or parts thereof using a fluid for insulating purposes only
    • 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
    • H01F27/40—Structural association with built-in electric component, e.g. fuse

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

The ignition coil incorporates a magnetic and a metallic insert which effectively puts an inductance in series with, the spark discharge across a capacitor. The discharge wave shape and component are frequencies to give improved engine ignition. The primary coil (2) is wound in two series connected halves round the outer limbs of a three limb magnetic circuit (1) and the high voltage secondary coil (3) is wound round the centre limb of the magnetic circuit. A high magnetic permeability screen (5) is placed over the secondary coil to increase its leakage reactance, and an insulating cylinder (6) is placed over this screen. A thin metal screen (7) is placed over the insulating layer. It does not form a closed circuit and is connected to the outer metal case (10) of the oil filled (13) coil, to form the capacitance between the secondary and earth. A flexible capsule (15) absorbs expansion of the oil with temperature.

Description

DESCRIPTION
La présente invention concerne les instruments du type n bobine dtinductance". DESCRIPTION
The present invention relates to instruments of the inductance type n coil.

Dans les dispositifs connus de ce genre, la rupture brusque d'un courant continu circulant initialement. dans un bobinage dit n primaire " engendre dans un bobinage dit " secondaire " une surtension de faible durée mais de grande amplitude. In known devices of this kind, the sudden rupture of a direct current initially flowing. in a so-called primary n winding generates in a so-called "secondary" winding an overvoltage of short duration but of large amplitude.

Cette surtension peut rye utilisee à produire une étincelle d'allumage du mélange air-essence assurant le fonctionnement d'un moteur. Dans ces dispositifs les caractéristiques de la décharge électrique obtenue ne sont pas les meilleures. This overvoltage can be used to produce an ignition spark of the air-petrol mixture ensuring the operation of an engine. In these devices the characteristics of the electric discharge obtained are not the best.

Le dispositif suivant l'invention permet d'dviter cet inconvénient. Dans celui-ci, un ecran magnétique enroulé autour du bobinage secondaire et relié à l'extremite haute tension permet de faire varier la self inductance de fuite. Un écran métallique, enroule autour de ltécran magnétique et relié à la masse constitue avec ltécran magnétique un condensateur. Ces deux écrans sont sépares par un dispositif isolant dimensionné pour résister à la haute tension. Les deux écrans sont réalisés de manier à ne pas constituer de spires en court circuit autour du bobinage secondaire. Les dessins annexes illustrent un mode de realisation du dispositif conforme à la présente invention.The device according to the invention makes it possible to avoid this drawback. In this one, a magnetic screen wrapped around the secondary winding and connected to the high voltage end makes it possible to vary the leakage inductance self. A metallic screen, wrapped around the magnetic screen and connected to ground constitutes with the magnetic screen a capacitor. These two screens are separated by an insulating device sized to withstand high voltage. The two screens are made so as not to constitute short-circuited turns around the secondary winding. The accompanying drawings illustrate an embodiment of the device according to the present invention.

I - Circuit magnétique fermé constitué d'un matériau magnétique à haute perméabilité dont les caractéristiques magnétiques sont suffisamment indépendantes de la frequence (tôles de fer - silicium isolées, ferrites, poudre de fer isolée). Les joints sont collés avec un produit durcissable contenant de la poudre magnétique en quantité suffisante pour réduire la réluctance des entrefers à une valeur négligeable.I - Closed magnetic circuit made of a magnetic material with high permeability, the magnetic characteristics of which are sufficiently independent of the frequency (iron sheets - isolated silicon, ferrites, isolated iron powder). The joints are glued with a hardenable product containing sufficient magnetic powder to reduce the reluctance of the air gaps to a negligible value.

2 - Bobinage primaire réalisé en deux moitiés identiques montées sur les branches laterales du circuit magnétique. Ce bobinage primaire est constitué d'un alliage dit " constantan " dont la résistévitE est indépendante de la température. Le conducteur à la forme d'un ruban dont la largeur est grande devant ltépaisseur. 2 - Primary winding produced in two identical halves mounted on the lateral branches of the magnetic circuit. This primary winding consists of a so-called "constantan" alloy whose resistance is independent of the temperature. The conductor has the form of a ribbon whose width is large in front of the thickness.

3 - Bobinage secondaire monté sur la branche centrale du circuit magnétique, l'une des extrémités étant reliée à la masse, l'autre étant reliée à la pièce 4.3 - Secondary winding mounted on the central branch of the magnetic circuit, one end being connected to earth, the other being connected to part 4.

4 - Pièce métallique de raccordement au circuit d'utilisation de la haute tension.4 - Metal part for connection to the high voltage use circuit.

5 - Ecran dit " intÉrieur n en matériau magnétique à haute perméabilite dont les caractéristiques sont suffisamment ondépendantes à la fréquence, réalisé de maniera à ne pas constituer de spires en court circuit. Cet écran augmente le flux ds fuite du bobinage secondaire. Il est par ailleurs relié à l'extremite haute tension du bobinage secondaire.5 - Screen called "interior n made of magnetic material with high permeability whose characteristics are sufficiently dependent on the frequency, produced so as not to constitute turns in short circuit. This screen increases the flow of leakage from the secondary winding. elsewhere connected to the high voltage end of the secondary winding.

6 - Cylindre isolant dimensionné de manière à résister b la haute tension produite par le bobinage aecondaire. 6 - Insulating cylinder sized to resist the high voltage produced by the secondary winding.

7 - Ecran dit " extérieur n métallique mince et réalisé de manière a ne pas consttuer de spire en court circuit. I1 est par ailleurs relié à la masse.7 - Screen called "thin metal exterior n" and made so as not to constitute a turn in short circuit. It is also connected to earth.

B - 9 Pièces métalliques de raccordement au bobinage primaire. B - 9 Metal parts for connection to the primary winding.

IO - Boitier métallique. IO - Metal case.

II - Pièce en matériau isolant assurant d'une part ie support des pièces de raccordement 4, 8 et 9, et assurant d'autre part la fermeture du boitier. II - Piece of insulating material ensuring on the one hand ie support for the connection pieces 4, 8 and 9, and on the other hand ensuring the closure of the housing.

I2 - Joint d'étanchéité. I2 - Seal.

I3 - Huile isolante remplissant absolument totalement le boitier.I3 - Insulating oil which completely fills the housing.

I4 - Orifice de remplissage d'huile, obturé après opération. I4 - Oil filling hole, closed after operation.

I5 - Capsule étanche constituée d'un matériau approprié, déformable sous l'effet de la dilatation de l'huile consécutivement à l'élévation de température entrainée par le fonctionnement et permettant ainsi d'effectuer le remplissage absolument total sans risque ultérieur d'éclatement. I5 - Sealed capsule made of a suitable material, deformable under the effect of the expansion of the oil following the rise in temperature caused by the operation and thus making it possible to carry out the absolutely complete filling without subsequent risk of bursting .

Selon la FIG 2 : L'écran 5 constitue le circuit magnétique de la self de V fuite L 3. Les écrans 5 et 7 et l'isolant 6 constituent un condensateur C2. La modification de ces deux éléments permet de faire varier à volonté les caractéristiques de la décharge électrique. Le dispositif objet de l'invention peut etre réalisé à partir d'un circuit magnétique à trois branches comme représenté F16 I ou à partir d'un circuit magnétique à deux branches ne comportant dans ce cas qu un bobinage primaire unique. According to FIG 2: The screen 5 constitutes the magnetic circuit of the V leakage choke L 3. The screens 5 and 7 and the insulator 6 constitute a capacitor C2. The modification of these two elements makes it possible to vary at will the characteristics of the electric discharge. The device which is the subject of the invention can be produced from a magnetic circuit with three branches as shown in F16 I or from a magnetic circuit with two branches in this case comprising only a single primary winding.

Claims (9)

REVENDICATIONS I - Dispositif permettant de faire varier les caractéristiques électriques d'un circuit haute tension permettant consécutivement de faire varier les caractéristiques d'une décharge électrique obtenue à partir de cette haute tension.I - Device making it possible to vary the electrical characteristics of a high voltage circuit making it possible consecutively to vary the characteristics of an electrical discharge obtained from this high voltage. 2 - Dispositif selon la revendication I caractérisé par le fait qu'il comporte un circuit magnétique fermé dans aucun entrefer.2 - Device according to claim I characterized in that it comprises a magnetic circuit closed in any gap. 3 - Dispositif selon la revendication 2 caractérisé par le fait que la suppression des entrefers est obtenue par l'utilisation de poudre magnétique en suspension dans un support durcissable après application.3 - Device according to claim 2 characterized in that the removal of the air gaps is obtained by the use of magnetic powder in suspension in a curable support after application. 4 - Dispositif selon la revendication 3 caractérisé par le fait qu'il comporte un écran métallique magnétique enroulé autour du bobinage secondaire, renforçant les fuites magnétiqués de ce bobinage secondaire, et relié à l'extrémité haute tension dudit bobinage secondaire.4 - Device according to claim 3 characterized in that it comprises a magnetic metal screen wound around the secondary winding, reinforcing the magnetic leaks of this secondary winding, and connected to the high voltage end of said secondary winding. 5 - Dispositif selon la revendication 4 caractérisé par le fait qu'il comporte un deuxième écran métallique relié à la masse, et séparé du premier par un isolant approprié.5 - Device according to claim 4 characterized in that it comprises a second metal screen connected to ground, and separated from the first by a suitable insulator. 6 - Dispositif selon la revendication 5 caractérisé par le fait que les deux écrans constituent un condensateur chargé directement par la haute tension produite par le bobinage secondaire.6 - Device according to claim 5 characterized in that the two screens constitute a capacitor charged directly by the high voltage produced by the secondary winding. 7 - Dispositif selon la revendication 6 caractérisé par le fait que le bobinage primaire est réalisé en alliage dit " constantan " de résistivité indépendante de la température assurant consécutivement la constance de la résistance du bobinage primaire quelle que soit la température.7 - Device according to claim 6 characterized in that the primary winding is made of said alloy "constantan" of resistivity independent of the temperature ensuring consecutively the constancy of the resistance of the primary winding whatever the temperature. 8 - Dispositif selon la revendication 7 caractérisé par le fait que le bobinage primaire est constitué d'un conducteur de section rectangulaire d'épaisseus faible par rapport à la largeur.8 - Device according to claim 7 characterized in that the primary winding consists of a conductor of rectangular section of small thickness compared to the width. 9 - Dispositif selon la revendication 8 caractérisé par le fait qu'il contient une capsule de compensation de la dilatation de l'huile de remplissage sous 11 effet d'une élévation de température.9 - Device according to claim 8 characterized in that it contains a capsule for compensating for the expansion of the filling oil under the effect of a rise in temperature. IO - Dispositif selon la revendication 9 caractérisé par le fait qu'il combine les effets d'accumulation et de décharge d'énergie à la fois par les phénomènes électromagnétique. et électrostatique. IO - Device according to claim 9 characterized in that it combines the effects of energy accumulation and discharge both by electromagnetic phenomena. and electrostatic. II - Dispositif selon la revendication IO caractérisé par le fait que les améliorations qu'il comporte par rapport aux dispositifs existants ne dépendent pas de la forme du circuit magnétique, ni de la forme des bobinages primaire et secondaire, ni de leurs dispositions relatives.  II - Device according to claim IO characterized in that the improvements which it comprises compared to the existing devices do not depend on the shape of the magnetic circuit, nor on the shape of the primary and secondary windings, nor on their relative arrangements.
FR7914265A 1979-06-05 1979-06-05 Ignition coil with controllable inductance and capacitance - has magnetic material round secondary to increase leakage reactance and isolated metal sheath to increase capacitance to earth Withdrawn FR2469027A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7914265A FR2469027A1 (en) 1979-06-05 1979-06-05 Ignition coil with controllable inductance and capacitance - has magnetic material round secondary to increase leakage reactance and isolated metal sheath to increase capacitance to earth

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7914265A FR2469027A1 (en) 1979-06-05 1979-06-05 Ignition coil with controllable inductance and capacitance - has magnetic material round secondary to increase leakage reactance and isolated metal sheath to increase capacitance to earth

Publications (1)

Publication Number Publication Date
FR2469027A1 true FR2469027A1 (en) 1981-05-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
FR7914265A Withdrawn FR2469027A1 (en) 1979-06-05 1979-06-05 Ignition coil with controllable inductance and capacitance - has magnetic material round secondary to increase leakage reactance and isolated metal sheath to increase capacitance to earth

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FR (1) FR2469027A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2617327A1 (en) * 1987-06-26 1988-12-30 Optelec Applic Optique Electro TORIC TRANSFORMER WITH INTEGRATED SELF-INDUCTION DEVICE

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2617327A1 (en) * 1987-06-26 1988-12-30 Optelec Applic Optique Electro TORIC TRANSFORMER WITH INTEGRATED SELF-INDUCTION DEVICE
EP0298878A1 (en) * 1987-06-26 1989-01-11 Societe Pour L'application De L'optique Et De L'electronique A La Recherche Et A L'automatisation Optelec (Societe Anonyme) Toroidal transformer with an integrated self-induction device

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