WO2005091317A2 - Dispositif de transformation servant a generer une tension d'allumage pour des moteurs a combustion interne - Google Patents

Dispositif de transformation servant a generer une tension d'allumage pour des moteurs a combustion interne Download PDF

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Publication number
WO2005091317A2
WO2005091317A2 PCT/EP2005/002760 EP2005002760W WO2005091317A2 WO 2005091317 A2 WO2005091317 A2 WO 2005091317A2 EP 2005002760 W EP2005002760 W EP 2005002760W WO 2005091317 A2 WO2005091317 A2 WO 2005091317A2
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WO
WIPO (PCT)
Prior art keywords
transformation device
ferromagnetic core
secondary winding
primary winding
electrode
Prior art date
Application number
PCT/EP2005/002760
Other languages
German (de)
English (en)
Other versions
WO2005091317A3 (fr
Inventor
Tycho Weissgerber
Guido Bayard
Original Assignee
Pulse Gmbh
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 Pulse Gmbh filed Critical Pulse Gmbh
Priority to EP05730907.2A priority Critical patent/EP1730754B1/fr
Priority to JP2007503277A priority patent/JP2007529887A/ja
Priority to CN2005800081493A priority patent/CN101040353B/zh
Publication of WO2005091317A2 publication Critical patent/WO2005091317A2/fr
Publication of WO2005091317A3 publication Critical patent/WO2005091317A3/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/12—Ignition, e.g. for IC engines
    • 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
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
    • 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
    • H01F27/346—Preventing or reducing leakage fields
    • 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

Definitions

  • Transformation device for generating an ignition voltage for internal combustion engines
  • the present invention relates to a transformation device according to the preamble of claim 1 for generating an ignition voltage for internal combustion engines.
  • a transformation device has a primary winding to which a primary voltage can be applied, a secondary winding in which a secondary voltage can be induced, a ferromagnetic core which is arranged in the primary winding and the secondary winding, and an electrode which faces one end of the ferromagnetic core, which is connected to the secondary winding and which can be connected to a spark gap.
  • Such a transformation device is known for example from DE 101 43 055 A1.
  • the primary and secondary windings, the ferromagnetic core and the electrode are accommodated in a housing and potted with casting compound.
  • the housing is open at one end and can be plugged directly onto a spark plug that is screwed into an engine block.
  • This has the advantage that high-voltage leads to the spark gap and the associated EMC (electromagnetic compatibility) problems can be avoided.
  • Further prior art is disclosed in the patents US 6 522 232 B2, EP 1 284 488 A2, EP 0 827 163 A2, DE 101 02 342 A1, US 6 191 674 B1, GB 725 722 and US 2 107 973.
  • transformation devices are arranged in the engine block, typically in depressions in the cylinder head, they must necessarily be designed to be small and compact.
  • the compactness of such transformation devices is becoming increasingly important, since internal combustion engines for motor vehicles, in particular for passenger cars and in the field of motorsport, are being designed to be smaller and smaller in relation to their performance.
  • the generation of high secondary voltages in a confined space in turn inevitably leads to strong electric fields within the transformation device. So that there is no electrical breakdown between components with different electrical potential, these must be effectively insulated from one another.
  • the invention has for its object to provide a transformation device in which the aging of the insulating materials is slowed down. According to a first aspect of the invention, this object is achieved by the features of claim 1, as will be explained in more detail below. Advantageous further developments are specified in the dependent claims.
  • the inventors identified partial discharge phenomena in small, sometimes microscopic cavities as the main cause of the aging of the insulating materials. Such cavities in the insulating materials can occur in transformation devices of the type mentioned for various reasons. Cavities, so-called blowholes, can occur in casting materials when incompletely degassed casting resins or through chemical side reactions. Furthermore, gaps can occur at interfaces between different insulating materials, for example due to thermo-mechanical stress. Finally, in the case of large electrical loads, so-called “electrical treeing" can produce elongated, branched cavities parallel to the direction of the field.
  • a gas discharge process which interacts with the insulating material is characteristic of partial discharges in cavities.
  • the gas discharge process changes the surface of the insulating material by chemical decomposition and erosion by the associated charge carrier bombardment and UV radiation, which ultimately leads to the aging of the insulating material.
  • the partial discharge is ignited by the presence of a so-called starting electron, provided that the existing electric field strength exceeds a threshold value, the so-called insertion field strength.
  • the invention is based on the knowledge that partial discharges and thus the aging of the insulating material can be suppressed if the electrical field, which is caused by the secondary voltage between the electrode and the opposite end of the ferromagnetic core, is everywhere below the field strength for partial discharges. In the present invention, this is achieved by facing the electrode. i te end of the ferromagnetic core has a continuously curved transition between the lateral surface and the end face.
  • an edge between the lateral surface and the end surface is avoided, and thus a locally increased field strength in the region of such an edge, which is attributable to an increased charge carrier density in the edge region, is also avoided ,
  • the probability of partial discharges occurring in the region of the end of the ferromagnetic core is significantly reduced in practice, and the aging of the insulating material is significantly slowed down.
  • the electrode is preferably concave on its side facing the core. This causes an equalization and homogenization of the electric field between the ferromagnetic core and the electrode and thus also a reduction in the local field strengths, as will be explained in more detail below using an exemplary embodiment.
  • each of the two features is suitable for reducing the strength of the electric field between the electrode and the ferromagnetic core. Seen in this way, both features enable the task to be solved individually. A particularly good result is obtained by combining both features.
  • the end of the ferromagnetic core described in the characterizing part of the main claim with a continuous transition between the outer surface and the end surface can be obtained by rounding off a cylindrical or angular magnetic core at its end facing the electrode.
  • This rounding of the end of a magnetic core is not known in the prior art.
  • the core consists of layers which are electrically insulated from one another to avoid eddy currents and which would be torn apart when the end of the core was machined by turning or grinding.
  • the inventors have succeeded in connecting the layers of the ferromagnetic core so firmly that machining of the end of the ferromagnetic core is possible without separating the layers.
  • the ends of the ferromagnetic core are formed by permanent magnets.
  • the continuously curved transition between the lateral surface and the end surface described above is achieved by suitable rounding off at least the permanent magnet on the side of the ferromagnetic core facing the electrode.
  • Such rounded permanent magnets are also unusual because permanent magnets are usually produced in a sintering process in extruded profiles and then broken into tablet form.
  • the end face of the ferromagnetic core opposite the electrode is preferably convex.
  • the curvature of the convex end face preferably increases with increasing distance from the central axis of the ferromagnetic core.
  • the curvature of the convex end face in the area of the central axis i.e. in the area which protrudes most towards the electrode, which reduces the surface charge density compared to areas of greater curvature and therefore also reduces the electric field strength in this area.
  • the electrode has a cup-shaped section, the opening of which faces the ferromagnetic core. Due to the cup shape, the electric field between the electrode and the ferro- on the one hand, the magnetic core is distributed over a larger spatial area and thus, to a certain extent, equalized, as a result of which the field strength is reduced, on the other hand, the field strength is spatially homogenized, thereby preventing the occurrence of locally increased field strengths.
  • This effect of the cup-shaped section of the electrode is explained in more detail below using an exemplary embodiment.
  • the cup-shaped section has a bottom section which is arranged transversely to the central axis of the ferromagnetic core and a wall section which surrounds a space located between the bottom section and the end face of the ferromagnetic element, where the distance between each point on the part of the surface of the wall section facing the ferromagnetic core and the ferromagnetic core is 0.5 to 2.5 times, preferably 0.75 to 1.8 times the distance between the bottom section and the intersection of the end face with the central axis of the ferromagnetic core.
  • This arrangement generates a field which is sufficiently homogeneous for practical purposes and which effectively contributes to avoiding partial discharges.
  • the transformation device preferably has a sleeve-shaped secondary winding support on which the secondary winding is arranged and which is closed at one end with the cup-shaped section.
  • the spaces between the components of the transformation device are electrically insulated.
  • potting compound containing a synthetic resin and a filler.
  • the filler has the function, inter alia, of adapting the thermal expansion coefficient of the casting compound to the thermal expansion coefficient of the components, for example the expansion coefficient of the metal of the electrode.
  • the probability of partial discharges occurring in the insulating material, i.e. in this case in the potting compound, according to a second aspect of the invention is substantially reduced in that the dielectric constant of the filler is 0.5 times to 1.5 times, preferably 0.8 times to 1.25 times and is particularly preferably 0.9 times to 1.2 times the dielectric constant of the synthetic resin.
  • the inventors have found that the spatial distribution of the filler in the casting compound is not necessarily homogeneous or not everywhere. For example, an increased filler concentration can occur on the surface of the secondary winding, while only the pure synthetic resin is present between the turns of the secondary winding because the spaces between the turns of the secondary winding are too small for the filler particles to penetrate into them.
  • the secondary winding acts as a filter for the filler.
  • the dielectric constant of the filler differs considerably from that of the synthetic resin in conventional casting compounds, spatial fluctuations in the concentration of the filler lead to spatial fluctuations in the dielectric constant of the casting compound.
  • the spatial fluctuations in the dielectric constant in turn lead to spatial fluctuations in the electrical field which the potting compound penetrates, since the strength of the electrical field is inversely proportional to the dielectric constant of the dielectric which it penetrates.
  • the spatial fluctuations in the electrical field strength have a threefold effect on the aging behavior of the insulating material, ie the casting compound. First, they cause locally increased electrical field strengths, which can lead to partial discharges in cavities. Secondly, mechanical forces occur in places where the field strength also changes suddenly due to a sudden change in the dielectric constant. Since these forces are continuously applied during operation of the transformation device, they stress the material in the long term, and the bond between the materials is gradually weakened, which can cause gaps in which partial discharges can then take place.
  • the inventors have found in experimental studies that the spatial fluctuations in the electric field strength, which are based on an inhomogeneous distribution of the filler, not only cause cavities to form, but also significantly accelerate the growth of existing cavities or defects in the insulating material in practice.
  • the insulating material is eroded by partial discharges in cavities. This erosion leads to a growth of the cavities, which is known, for example, as "electrical treeing". This growth takes place the faster, the more often flat charges occur in the cavity. If the electric field strength fluctuates spatially due to an inhomogeneous filler distribution, locally increased field strengths occur that can ignite partial discharges and accelerate the growth of the cavity.
  • the spatial distribution of the fillers is statistical in nature and is therefore not only inhomogeneous but also microscopically disordered.
  • the disorder or indefiniteness of the distribution of the filler concentration leads to a disordered distribution of locally excessive electrical field strengths, which in turn leads to partial discharges in different sections of a expanding cavity and enables its growth in different directions.
  • the disorderly distribution of locally increased field strengths results in far more possibilities for the growth of cavities due to partial discharges than is the case, for example, with an increase in the electric field occurring along a defined interface between two different dielectrics. As a result, the cavities can spread more easily and quickly due to the disorderly field elevation.
  • the inventors have recognized that the spatial fluctuations in the filler concentration are responsible for the formation of defects in the insulating material, for the occurrence of partial discharges in existing defects and for the accelerated growth of the defects, and thus accelerate the aging of the insulating material.
  • This cause of accelerated aging can be effectively prevented in the manner described above by matching the dielectric constants of the filler and the synthetic resin. If the dielectric constants of the filler and the synthetic resin differ from one another only to the extent described, the dielectric constant of the casting compound as a whole is approximately homogeneous even if the filler is not homogeneously distributed in the synthetic resin. In this way, partial discharges in the casting compound are avoided even when the filler is inhomogeneously distributed, and the formation and growth of defects is suppressed, whereby the aging of the casting compound is effectively delayed.
  • the above-mentioned components, the spaces between which are filled with the sealing compound, can include one or more of the following parts: a primary winding support, a secondary winding support, an electrode which is connected to a secondary winding and can be connected to a spark gap, a ferromagnetic core and / or a metal case.
  • the dielectric constant of the plastic in an advantageous development is 0.5 times to 1.5 times, preferably 0.8 times to 1.25 times and particularly preferably 0.9 -fold up to 1.2 times the dielectric constant of the casting compound. This avoids an excessive jump in the dielectric constant at the interface between the sealing compound and the component together with the negative consequences described above.
  • the synthetic resin is an epoxy resin and the filler quartz.
  • Another aspect of the invention is directed to the electromagnetic compatibility of the transformation device.
  • the inventors have found in simulations and experimental EMC tests that the spark is the primary source of electromagnetic interference.
  • a conductive layer which is connected to the ground potential, is arranged between the primary winding and the secondary winding. This prevents the interference caused by the ignition spark by capacitive coupling between the secondary winding and the primary winding is transmitted to the on-board network of a motor vehicle connected to the primary winding. This effectively prevents malfunctions in electronic control devices which are connected to the on-board network.
  • the conductive layer is preferably arranged directly adjacent to the primary winding. As a result, the conductive layer is at a maximum distance from the secondary winding. The strength of the electric field between the conductive layer and the secondary winding can thereby be kept low.
  • the conductive layer can be formed by a film or applied to a carrier material, in particular vapor-deposited or printed on.
  • the secondary winding is preferably arranged at least partially within the primary winding.
  • This arrangement in which the secondary winding is on the inside and the primary winding is on the outside, leads to a reduced electric field strength in the interior of the transformation device and helps to avoid partial discharges in comparison with the usual, reverse arrangement with the same diameter of the transformation device.
  • the transformation device preferably has a sleeve-like primary winding support on which the primary winding is arranged.
  • the above-mentioned conductive layer is arranged on the outer circumferential surface of the primary winding carrier.
  • the primary winding carrier then serves to space the conductive layer from the secondary winding and to insulate it from the latter.
  • the above-mentioned secondary winding carrier is preferably arranged within the primary winding carrier and the space between the primary winding carrier and the secondary winding carrier is filled with potting compound.
  • the turns of the primary winding can be connected by conductive baking lacquer or conductive adhesive, which form the conductive layer. Then no primary winding carrier is required.
  • 3 is a perspective view of the primary winding and the primary winding carrier in the assembled state
  • 4 shows a longitudinal sectional view of a secondary winding, a secondary winding carrier, a ferromagnetic core, a conductive pin and an electrode in the disassembled state
  • FIG. 5 shows a longitudinal sectional view of the components of FIG. 4 in the assembled state
  • FIG. 6 shows a perspective view of the components of FIG. 4 in the assembled state
  • FIG. 7 shows a longitudinal sectional view of an ignition transformation device according to a development of the invention
  • FIG. 8 shows a perspective view of the ignition transformation device from FIG. 7,
  • FIG. 9 shows a schematic illustration of the course of the electrical field between an electrode and one end of a ferromagnetic core according to the prior art
  • FIG. 10 shows a schematic illustration of the course of the electrical field between an electrode and a ferromagnetic core in one exemplary embodiment of the invention
  • FIG. 11 shows a schematic illustration of a radial section through part of the transformation device from FIG. 7, 12 shows the course of the electrostatic potential in the radial direction in the part of the transformation device shown in FIG. 11 for two casting compounds with different fillers.
  • FIG. 13 shows the course of the electric field corresponding to FIG. 12,
  • FIG. 14 shows a schematic illustration of the interference path of an interference pulse caused by an ignition spark in an ignition transformer according to the prior art
  • 15 shows a schematic illustration of the interference path of an interference pulse caused by an ignition spark in an ignition transformer according to an exemplary embodiment of the invention.
  • the primary winding support 10 consists of insulating material and has a sleeve-like shape with an approximately cylindrical cavity 14. At one end of the cavity 14 there is an opening 16, the diameter of which is reduced compared to the diameter of the cavity 14.
  • the peripheral surface of the primary winding carrier 10 is coated with a conductive layer 18, which is formed by a film or is vapor-deposited or printed on the primary winding carrier 10.
  • the conductive layer 18 is connected to the ground potential in the completely assembled transformation device (see FIG. 15).
  • the primary winding 12 has two connections 20 and 22 for applying a primary voltage.
  • Fig.3 are the The primary winding carrier 10 and the primary winding 12 are shown in perspective in the assembled state.
  • FIG. 4 shows a secondary winding carrier 24, a secondary winding 26, a ferromagnetic core 28, a conductive pin 30 and an electrode 32 in the disassembled state in a longitudinal section.
  • the secondary winding carrier 24 like the primary winding carrier 10 from FIGS. 1 to 3, is made of insulating plastic and is sleeve-shaped with a cylindrical cavity 34.
  • the ferromagnetic core 28 consists of a cylindrical soft iron rod 36, which consists of a large number of mutually electrically insulated lamellae, and permanent magnets 38 arranged at the ends of the soft iron rod 36.
  • the permanent magnets 38 magnetize the soft iron rod 36 with a polarity that is opposite to the polarity of the magnetic field that is generated when a primary voltage is applied to the terminals 20, 22 of the primary winding 12.
  • the soft iron rod 36 is magnetized against the polarization of the permanent magnets 38. " If the primary voltage is interrupted to generate the ignition voltage, the soft iron core assumes its output magnetization, and the secondary voltage required for ignition is induced in the secondary winding 26. The premagnetization with the permanent magnets increases the energy stored in the magnetic field, which increases the charge flow the spark gap enables.
  • the electrode 32 has a cup-shaped section 40 with a bottom section 42 and a wall section 44, and a threaded section 46 an electrical connection to a spark plug can be made in the threaded section 46 in a manner not shown here.
  • FIG. 5 shows the components of FIG. 4 in the assembled state in a longitudinal section.
  • the ferromagnetic core 28 is arranged in the cavity 34 of the secondary winding carrier 24.
  • One end of the secondary winding carrier 24 is closed with the cup-shaped section 40 of the electrode 32.
  • the cavity 34 is filled with insulating potting compound 48. So that no air is trapped in the region of the cup-shaped section 44 of the electrode 32 when the cavity 34 is being poured out, air outlet openings 47 and 49 (see FIG. 4) are formed both in the cup-shaped section 44 and in the secondary winding body, through which the air escapes during the pouring out can.
  • the conductive pin 30 is conductively connected to one end of the secondary winding 26 and is intended for connection to the ground potential.
  • the other end of the secondary winding 26 is connected to the electrode 32.
  • Figure 6 shows the assembled components of Figure 5 in a perspective view.
  • FIG. 7 shows a longitudinal sectional view in which the secondary winding carrier 24 including the secondary winding 26 and electrode 32 is arranged in the cavity 14 of the primary winding carrier 10 (see FIGS. 1 and 2).
  • the threaded section 46 of the electrode 32 is inserted through the opening 16 (see FIG. 1) in the primary winding carrier 10.
  • the space between the primary winding carrier 10 and the secondary winding carrier 24 is filled with insulating potting compound 48.
  • the encapsulation can take place in two independent steps: first, the cavity 34 of the secondary winding carrier 24 with the ferromagnetic core 28 located therein can be encapsulated and then the cavity 14 of the primary winding carrier 10 with the secondary winding carrier 24 located therein. In this double-ridged encapsulation it is easier to avoid the formation of voids in which the partial discharges that are largely responsible for aging can take place.
  • FIG. 9 shows a sectional illustration of an electrode 32 'and a ferromagnetic core 28' with a soft iron rod 36 'and a permanent magnet 38' as used in conventional transformation devices from the prior art. Between the electrode 32 'and the end of the ferromagnetic core 28' facing it, which is formed by the permanent magnet 38 ', there is an electric field 50', which is shown schematically by field lines.
  • the permanent magnet 38 ' is cylindrical and thus has a sharp edge 38c' at the transition between its outer surface 38a 'and its end surface 38b'.
  • the charge carrier density is locally increased at this sharp edge and therefore the field line density of the electric field 50 'is also increased.
  • the intermediate area between the electrode 32 'and the ferromagnetic core 28' is filled with an insulating casting compound (not shown in FIG. 9).
  • the electric field strength in the area of the edge 38c ' is sufficiently large to ignite partial discharges in microscopic cavities in the casting compound, which contribute significantly to their aging.
  • FIG. 9 The conventional arrangement of FIG. 9 is compared in FIG. 10 with the arrangement according to a development of the invention.
  • the permanent magnet 38 (see also FIGS. 4, 5 and 7) is rounded, ie it has a continuously curved transition between an outer surface area 38a and an end face area 38b.
  • the shape of the permanent magnet 38 or, more generally, by the shape of the end of the ferromagnetic core 28 opposite the electrode 32 an edge or tip and a concomitant local field strength increase are avoided. It can thus be achieved that the strength of a field 50 between the ferromagnetic core 28 and the electrode 32 remains below the so-called insertion field strength for partial discharges everywhere.
  • the electrode 32 has a cup-shaped section 40 with a bottom section 42 and a wall section 44.
  • the wall section 44 surrounds the space between the bottom section 42 and the end face of the permanent magnet 38.
  • the cup-shaped shape of the electrode 32 leads to an equalization of the field 50, i.e. to enlarge the space filled by the field 50 and to homogenize the electric field.
  • equalizing the field its average field strength is reduced, while local field strength increases are avoided by homogenizing the field.
  • the strength of the field 50 can be kept anywhere below the field strength for partial discharges.
  • the potting compound 48 consists of a synthetic resin and a filler.
  • the filler has the function, among other things, of the thermal expansion coefficient of the casting compound 48, that of the electrode 32 and the like. equalize.
  • the secondary winding 26 is only indicated schematically in FIG. 11. In reality, it can comprise about 70 layers of wire with a diameter of only about 50 ⁇ m. With such a fine wire, the spaces between the individual turns are so narrow that the filler cannot penetrate into the spaces between the individual turns. Only the pure synthetic resin thus penetrates into the secondary winding 26.
  • the casting compound 48 In a radially outer border of the S un ärwic lu g 26-Befeiebv 4Sa, d-.h. the area between ⁇ and r 2 in FIG. 11, there is accordingly an increased concentration of the filler. In the region 48b between r 2 and r 3 , the casting compound 48 has the usual concentration of the filler, and the primary winding carrier 10 begins radially outside of r 3 .
  • FIG. 12 The radial course of the electrostatic potential along the section of FIG. 11 is shown in FIG. 12, and the corresponding radial course of the electric field strength is shown in FIG. 13.
  • a broken line 52 and 56 shows the course for a conventional potting compound that the filler has a significantly higher dielectric constant than the synthetic resin
  • the solid lines 54 and 58 show the course according to a development of the invention in which the dielectric constants of the synthetic resin and the filler are almost identical.
  • the secondary voltage is constant.
  • the potential decreases with increasing radial distance from the secondary winding.
  • the filler has a different, ie generally higher, dielectric constant than the synthetic resin, at r 2l where the concentration of the filler in the casting compound 48 changes, the dielectric constant of the casting compound 48 changes as whole. This leads to a kink in the potential curve (see graph 52 in Fig. 12) or a jump in the electrical field (see graph 56 in Fig. 13).
  • This jump in the electric field strength at r 2 leads to mechanical stresses and cracks or gaps in the case of prolonged stress, in which the partial discharges which are decisive for the aging of the casting compound can take place.
  • a filler is used whose dielectric constant is almost identical to that of the synthetic resin.
  • an epoxy resin is used for the synthetic resin and quartz is used for the filler.
  • quartz is used for the filler.
  • the dielectric constant of the material of the primary winding support 10 and of the secondary winding support 24 is adapted to that of the synthetic resin. This effectively prevents the formation of a gap between the casting compound on the one hand and the winding carriers 10, 24 on the other.
  • the improved EMC properties of the transformation device are explained below with reference to FIGS. 14 and 15.
  • the conventional firing arrangement of FIG. 14 comprises an external secondary winding 26 'and an internal primary winding 12'.
  • the secondary winding 26 ' is conductively connected to an electrode 32', which in turn is connected to a spark plug 62 via a contact spring 60.
  • the transformation device and the spark plug 62 are accommodated together in a housing 64 connected to the ground potential.
  • the spark plug 62 has an electrode 64 which is at ground potential and forms one end of a spark gap
  • FIG. 14 schematically shows an interference path 66 along which an interference pulse propagates.
  • the fault path begins in the radio kenumble and runs over the spark plug 62, the contact spring 60 and the electrode 62 'to the secondary winding 26'.
  • the interference path 66 runs due to a capacitive coupling between the secondary winding 26 'and the primary winding 12' through the primary winding 12 'and its connection 20' into the on-board network 68 of the motor vehicle, in which it can cause malfunctions in electronic control devices.
  • the interference pulse reaches the ground potential via the on-board network 68 and thus to the electrode 64 of the spark gap, so that the interference path 66 closes.
  • the ignition device contains the transformation device described in connection with FIGS. 1 to 8, which is accommodated here together with a spark plug 62 in a metallic housing or boiler shell 64 connected to ground potential.
  • the electrode 32 is connected to a connection of the spark plug 62 via a schematically illustrated plug connection 70.
  • the voltage drop as a result of the occurrence of an ignition spark 65 propagates as an interference pulse along an interference path 72 via the spark plug 62, the plug connection 70 and the electrode 32 to the secondary winding 26, which is arranged on the inside in the transformation device shown.
  • the conductive layer is formed by conductive adhesive or conductive baked enamel to which the turns of the primary winding (12) are connected and held together. Then no primary coil former is required.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

L'invention concerne un dispositif de transformation servant à générer une tension d'allumage pour des moteurs à combustion interne. Ce dispositif de transformation comprend un enroulement primaire (12), un enroulement secondaire (26), un noyau ferromagnétique (28), et une électrode (32) qui est opposée à une extrémité (38) du noyau (28), qui est reliée avec l'enroulement secondaire (26), et qui peut être reliée avec un éclateur. Ladite extrémité (38) du noyau ferromagnétique comporte une transition à courbure continue entre la surface latérale et la face.
PCT/EP2005/002760 2004-03-15 2005-03-15 Dispositif de transformation servant a generer une tension d'allumage pour des moteurs a combustion interne WO2005091317A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP05730907.2A EP1730754B1 (fr) 2004-03-15 2005-03-15 Dispositif de transformation servant a generer une tension d'allumage pour des moteurs a combustion interne
JP2007503277A JP2007529887A (ja) 2004-03-15 2005-03-15 内燃機関用の点火電圧を発生するための変圧装置
CN2005800081493A CN101040353B (zh) 2004-03-15 2005-03-15 用于产生内燃机点火电压的转换装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004012482A DE102004012482B4 (de) 2004-03-15 2004-03-15 Transformationsvorrichtung zum Erzeugen einer Zündspannung für Verbrennungskraftmaschinen
DE102004012482.5 2004-03-15

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WO2005091317A2 true WO2005091317A2 (fr) 2005-09-29
WO2005091317A3 WO2005091317A3 (fr) 2005-11-24

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EP (1) EP1730754B1 (fr)
JP (1) JP2007529887A (fr)
CN (1) CN101040353B (fr)
DE (1) DE102004012482B4 (fr)
WO (1) WO2005091317A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9431166B2 (en) 2013-03-06 2016-08-30 Kabushiki Kaisha Toshiba Inductor and method of manufacturing the same

Citations (6)

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US2081979A (en) * 1934-08-28 1937-06-01 Rca Corp Ignition coil system
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CN101040353B (zh) 2012-06-06
DE102004012482A1 (de) 2005-10-06
EP1730754A2 (fr) 2006-12-13
CN101040353A (zh) 2007-09-19
JP2007529887A (ja) 2007-10-25
EP1730754B1 (fr) 2015-12-30
DE102004012482B4 (de) 2005-12-29

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