EP2009749A2 - Method of dissipating an electric over-voltage potential - Google Patents

Method of dissipating an electric over-voltage potential Download PDF

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Publication number
EP2009749A2
EP2009749A2 EP08103855A EP08103855A EP2009749A2 EP 2009749 A2 EP2009749 A2 EP 2009749A2 EP 08103855 A EP08103855 A EP 08103855A EP 08103855 A EP08103855 A EP 08103855A EP 2009749 A2 EP2009749 A2 EP 2009749A2
Authority
EP
European Patent Office
Prior art keywords
substance
potential
conductor
electrically conductive
compensation
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.)
Withdrawn
Application number
EP08103855A
Other languages
German (de)
French (fr)
Other versions
EP2009749A3 (en
Inventor
Jochen Huebl
Roland Mager
Ingo Koehler
Michael Keicher
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2009749A2 publication Critical patent/EP2009749A2/en
Publication of EP2009749A3 publication Critical patent/EP2009749A3/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
    • H01C7/12—Overvoltage protection resistors
    • H01C7/123—Arrangements for improving potential distribution
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
    • H01C17/06—Apparatus or processes specially adapted for manufacturing resistors adapted for coating resistive material on a base
    • H01C17/065—Apparatus or processes specially adapted for manufacturing resistors adapted for coating resistive material on a base by thick film techniques, e.g. serigraphy
    • H01C17/06506—Precursor compositions therefor, e.g. pastes, inks, glass frits
    • H01C17/06513—Precursor compositions therefor, e.g. pastes, inks, glass frits characterised by the resistive component
    • H01C17/06533—Precursor compositions therefor, e.g. pastes, inks, glass frits characterised by the resistive component composed of oxides
    • H01C17/06546—Oxides of zinc or cadmium
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding  
    • H01R13/6485—Electrostatic discharge protection
    • 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
    • H01F27/343—Preventing or reducing surge voltages; oscillations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/04—Arrangements of electric connections to coils, e.g. leads

Definitions

  • the invention relates to a method for deriving an electrical overvoltage potential from an electrical conductor of an electrical / electronic circuit or the like to a compensation potential.
  • the invention provides that the conductor is coated or brought into contact with an always or temporarily electrically conductive substance which leads up to the compensation potential and / or that an electrically non-conductive component adjoining the conductor is replaced by a component which comprises the substance is or has this and extends to the compensation potential. It is therefore intended that the conductor is coated or brought into contact with a permanently or temporarily electrically conductive substance. Wherein the substance leads from the conductor to the output potential, where the substance is in contact with the compensation potential. If the substance is always a conductive substance, a steady flow of current is ensured. whereby the overvoltage potential is reduced continuously or a build-up of the overvoltage potential is prevented.
  • the temporarily electrically conductive substance leads only in certain situations to deriving the overvoltage potential, in particular if the overvoltage potential exceeds a certain potential, the threshold potential. As a result, a power loss of the circuit is kept low because current flows only temporarily through the substance to the compensation potential.
  • an electrically nonconductive component such as a plastic part, adjacent to the conductor is replaced by a component which consists of or comprises the substance and extends to the compensation potential, so that the conductor is replaced by the component the overvoltage potential can be derived to the compensation potential.
  • the component which consists of or has the substance is always or temporarily electrically conductive, as described above, and preferably has the same geometric shape as the electrically non-conductive component, so that the electrically non-conductive component in a simple manner by the always or temporarily electrically conductive component can be replaced.
  • the always or temporarily electrically conductive component is advantageously installed instead of the electrically non-conductive component. Since it does not differ substantially geometrically from the electrically non-conductive component, the previously provided mounting steps for mounting the circuit can be maintained, so that the introduction of the advantageous component leads to no additional steps and / or costs during assembly.
  • the substance can be applied during assembly in a simple manner to the existing elements of the circuit, in particular conductor and compensation potential. The assembly of the circuit is thereby influenced or prevented only insignificantly. Overall, the electrical / electronic circuit must not be structurally changed due to the advantageous method to derive an electrical overvoltage potential from the electrical conductor to the compensation potential.
  • the substance used is a varistive and / or resistive substance.
  • the varistive substance has varistor properties, which make the substance temporarily electrically conductive.
  • the varistive substance has a voltage-dependent resistance. Above a certain threshold voltage, the resistance decreases abruptly, whereby the characteristic curve is symmetrical to the voltage, so that the polarity is irrelevant.
  • the resistive substance has a resistance that always allows a current flow, so that the overvoltage potential is dissipated, in which electricity is always dissipated.
  • a material is used as the substance, the varistor elements and / or electrically conductive elements are added.
  • the material as such is electrically nonconductive and is made electrically conductive, at least temporarily, by the incorporation of the varistor elements and / or electrically conductive elements.
  • varistor beads are added to the material. These can be distributed particularly well in the material, so that the varistiven properties of the substance are guaranteed at each point of the substance.
  • the substance is applied in pasty, hardening form.
  • the conductor is coated by means of the pasty substance, which leads to the compensation potential.
  • the substance adapts advantageously to the conductor, the compensation potential and possibly intervening elements of the circuit.
  • the substance is particularly easy to apply and derivation can be created.
  • the substance hardens and forms a solid dissipation element, which is connected to the conductor and the compensation potential.
  • a release of the substance during operation is permanently prevented.
  • the substance penetrates into the rear grip training on conductors and / or compensation potential.
  • an adhesive is used as the substance.
  • This substance can be applied in addition to or instead of an electrically non-conductive adhesive.
  • the substance thus adheres to conductor and compensation potential, whereby a permanent contact is ensured safe.
  • the assembly of the circuit is not or only minimally influenced.
  • the FIG. 1 shows a schematic sectional view of a first embodiment of the method according to the invention for deriving an electrical overvoltage potential.
  • the FIG. 1 shows a coil group 1 of a hydraulic unit of a brake system.
  • the coil group 1 has a housing 2, in which a coil 3, consisting of a coil carrier 4 are wound around the turns 5 of the coil 3 around.
  • a coil 3 consisting of a coil carrier 4 are wound around the turns 5 of the coil 3 around.
  • the bobbin 5 At one end of the bobbin 5 is located with an end plate 6 on the housing 2, at the other end, the bobbin 4 an end plate 7, from the Terminal projections 8 project through openings of the housing 2 to the outside.
  • the connection projections 8 electrically conductive conductors 10 and 11 are guided by the coil 3 to the outside, so that the coil 3 can be electrically contacted via the conductors 10 or 11.
  • the housing 2 is electrically conductive and represents a compensation potential 12, in particular ground potential 13.
  • a compensation potential 12 in particular ground potential 13.
  • the connection projection. 9 and the housing 2 in the region of the connection projection 9 a substance 14 applied, which is temporarily electrically conductive.
  • a varistive substance 15 is used as the substance 14.
  • the varistiven properties of the substance 14 cause that upon reaching a threshold potential, the overvoltage potential of the conductor 11 to the compensation potential 12 and ground potential 13 is instructed, so that the sensitive electronics is protected from discharging an overpotential.
  • the substance 14 can be applied in a simple manner in pasty form, wherein it adapts advantageously to the geometric conditions.
  • the substance 14 or varistive substance 15 used is a material 16 to which varistor elements, in particular varistor beads, are added gives substance 15 its varistic character.
  • FIG. 2 shows in a second embodiment, the coil group 1, already from the FIG. 1 is known, so that only the differences should be discussed here.
  • the electrically non-conductive bobbin 4 is replaced by a bobbin 17 in the second embodiment, which consists of the same material as the varistive substance 15, so that the bobbin 17 has varistive properties.
  • the overvoltage potential is discharged via the end plates 6 and 7 directly to the housing 2 and thus to the compensation potential 12 or ground potential 13.
  • the steps / assembly steps can be maintained, it is only the bobbin 17, which consists of the material 16, installed.
  • the assembly steps remain the same, so that even with an automatic assembly no increased effort is required to mount the coil group 1. It is only necessary to replace the coil carrier 4, which represents an electrically non-conductive component 18, by the coil carrier 17, which forms a temporarily electrically conductive component.
  • a resistive substance can be used, which is always electrically conductive and connects the conductor 11 with the compensation potential 12.
  • the electrically conductive elements such as electrically conductive threads and / or fibers are added.
  • the resistive substance has a resistance which always allows a current flow from the conductor 11 to the compensation potential 12, so that the overvoltage potential does not reach a critical value.
  • the conductors 10 and 11 may be formed, for example, as insulation displacement connections for easy connection, for example with a control unit. Of course, the conductor 11 may be provided with the substance.
  • FIGS. 3 and 4 show a third and a fourth embodiment of the invention. Shown schematically is an electric motor 20, which rests against an electrically conductive housing plate 21, wherein through an opening 22, a motor contact dome 23 leads through which two conductors 24, 25 of the motor 20 lead.
  • an electrical overvoltage potential from the motor 20 to the electrically conductive housing plate 21, which forms the compensation potential 12 and ground potential 13, is on the conductors 24 and 25, the motor contact dome 23 and the housing plate 21 in the region of the motor contact dome 23rd the varistive substance 15 applied as in FIG. 3 shown.
  • a component 27 is used, which consists of the material 16, as in the FIG. 4 shown.
  • an overvoltage potential can be derived on the compensation potential 12 in a simple manner.
  • FIG. 5 shows in a fifth embodiment of the invention, the underside of a control unit 28 in which a stamped grid 29 rests, which a plurality of lead frame terminals 30, of which only a few are provided with reference numerals, are arranged in a row.
  • a stamped grid 29 rests, which a plurality of lead frame terminals 30, of which only a few are provided with reference numerals, are arranged in a row.
  • an adhesive 32 is applied to the housing part 31, wherein the leadframe terminals 30 are pressed onto the adhesive 32 during assembly.
  • a substance 33 which is an adhesive 34 and at the same time has varistive and / or resistive properties is advantageously used instead of the electrically non-conductive adhesive 32.
  • the adhesive 34 is used which has varistive and / or resistive properties. As a result, a derivation for an electrical overvoltage potential from the stamped grid 29 to the compensating potential 35 formed by the housing part 31 is provided in a simple manner.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Thermistors And Varistors (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The method involves coating a conductor or bringing the conductor in connection with a permanent or temporary electrically conductive substance. The substance is led to the compensation potential. An electrically non conductive component is replaced by a component and is adjacent to the conductor. The component consists of the substance and extends up to the compensation potential. A resistive substance is used as the substance.

Description

Die Erfindung betrifft ein Verfahren zum Ableiten eines elektrischen Überspannungspotentials von einem elektrischen Leiter einer elektrischen/elektronischen Schaltung oder dergleichen zu einem Ausgleichspotential.The invention relates to a method for deriving an electrical overvoltage potential from an electrical conductor of an electrical / electronic circuit or the like to a compensation potential.

Stand der TechnikState of the art

Verfahren der eingangs genannten Art sind bekannt. So sind im Stand der Technik eine Vielzahl von Möglichkeiten zu finden, eine elektrische/elektronische Schaltung mit Ableitpfaden zum Ableiten des Überspannungspotentials zu versehen. So werden üblicherweise konstruktiv zusätzliche Ableitpfade in die Schaltung oder dergleichen integriert. Das bedeutet zum Einen, dass bei der Konstruktion der Schaltung der Aufwand steigt und zum Anderen, dass bereits bei der Entwicklung die Ableitpfade berücksichtigt werden müssen und nachträglich nur unter hohem Aufwand in die Schaltung eingebracht werden können.Method of the type mentioned are known. Thus, in the prior art, a variety of ways to find an electrical / electronic circuit with Ableitpfaden to derive the overvoltage potential to provide. So constructive additional Ableitpfade are usually integrated into the circuit or the like. This means, on the one hand, that in the construction of the circuit the expense increases and, on the other hand, that the discharge paths must be taken into account during the development and can subsequently be introduced into the circuit only at great expense.

Offenbarung der ErfindungDisclosure of the invention

Die Erfindung sieht vor, das der Leiter mit einer stets oder temporär elektrisch leitfähigen Substanz beschichtet oder in Verbindung gebracht wird, die bis zu dem Ausgleichspotential führt und/oder dass ein an den Leiter angrenzendes elektrisch nicht leitendes Bauteil durch ein Bauteil ersetzt wird, das aus der Substanz besteht oder diese aufweist und sich bis zum Ausgleichspotential erstreckt. Es ist also vorgesehen, dass der Leiter mit einer stets oder temporär elektrisch leitfähigen Substanz beschichtet oder in Verbindung gebracht wird. Wobei die Substanz von dem Leiter zu dem Ausgangspotential führt, wo die Substanz in Kontakt mit dem Ausgleichspotential steht. Ist die Substanz als stets leitfähige Substanz ausgebildet, so wird ein stetiger Stromfluss gewährleistet, wodurch das Überspannungspotential stetig abgebaut wird beziehungsweise ein Aufbauen des Überspannungspotentials verhindert wird. Die temporär elektrisch leitfähige Substanz führt nur in bestimmten Situationen zu einem Ableiten des Überspannungspotentials, insbesondere wenn das Überspannungspotential ein bestimmtes Potential, das Schwellpotential, überschreitet. Dadurch wird eine Verlustleistung der Schaltung gering gehalten, da Strom nur temporär über die Substanz zu dem Ausgleichspotential fließt. Alternativ und/oder zusätzlich ist vorgesehen, dass ein an den Leiter angrenzendes elektrisch nicht leitendes Bauteil, wie zum Beispiel ein Kunststoffteil, durch ein Bauteil ersetzt wird, das aus der Substanz besteht oder diese aufweist und sich bis zum Ausgleichspotential erstreckt, sodass von dem Leiter das Überspannungspotential zu dem Ausgleichspotential abgeleitet werden kann. Das Bauteil, das aus der Substanz besteht oder diese aufweist ist stets oder temporär elektrisch leitfähig, wie oben beschrieben, und weist bevorzugt die gleiche geometrische Formgebung wie das elektrisch nicht leitende Bauteil auf, sodass das elektrisch nicht leitende Bauteil auf einfache Art und Weise durch das stets oder temporär elektrisch leitfähige Bauteil ersetzt werden kann. Bei der Montage der elektrischen/elektronischen Schaltung (oder dergleichen) wird vorteilhafterweise anstelle des elektrisch nicht leitenden Bauteils das stets oder temporär elektrisch leitfähige Bauteil eingebaut. Da es sich im Wesentlichen geometrisch nicht von dem elektrisch nicht leitenden Bauteil unterscheidet, können die bisher vorgesehenen Montageschritte zur Montage der Schaltung beibehalten werden, sodass das Einbringen des vorteilhaften Bauteils zu keinen zusätzlichen Schritten und/oder Kosten bei der Montage führt. Die Substanz kann bei der Montage auf einfache Art und Weise auf die bestehenden Elemente der Schaltung, insbesondere Leiter und Ausgleichspotential, aufgebracht werden. Die Montage der Schaltung wird dadurch nur unwesentlich beeinflusst beziehungsweise verhindert. Insgesamt muss die elektrische/elektronische Schaltung aufgrund des vorteilhaften Verfahrens konstruktiv nicht verändert werden, um ein elektrisches Überspannungspotential von dem elektrischen Leiter zu dem Ausgleichspotential abzuleiten.The invention provides that the conductor is coated or brought into contact with an always or temporarily electrically conductive substance which leads up to the compensation potential and / or that an electrically non-conductive component adjoining the conductor is replaced by a component which comprises the substance is or has this and extends to the compensation potential. It is therefore intended that the conductor is coated or brought into contact with a permanently or temporarily electrically conductive substance. Wherein the substance leads from the conductor to the output potential, where the substance is in contact with the compensation potential. If the substance is always a conductive substance, a steady flow of current is ensured. whereby the overvoltage potential is reduced continuously or a build-up of the overvoltage potential is prevented. The temporarily electrically conductive substance leads only in certain situations to deriving the overvoltage potential, in particular if the overvoltage potential exceeds a certain potential, the threshold potential. As a result, a power loss of the circuit is kept low because current flows only temporarily through the substance to the compensation potential. Alternatively and / or additionally, it is provided that an electrically nonconductive component, such as a plastic part, adjacent to the conductor is replaced by a component which consists of or comprises the substance and extends to the compensation potential, so that the conductor is replaced by the component the overvoltage potential can be derived to the compensation potential. The component which consists of or has the substance is always or temporarily electrically conductive, as described above, and preferably has the same geometric shape as the electrically non-conductive component, so that the electrically non-conductive component in a simple manner by the always or temporarily electrically conductive component can be replaced. When mounting the electrical / electronic circuit (or the like), the always or temporarily electrically conductive component is advantageously installed instead of the electrically non-conductive component. Since it does not differ substantially geometrically from the electrically non-conductive component, the previously provided mounting steps for mounting the circuit can be maintained, so that the introduction of the advantageous component leads to no additional steps and / or costs during assembly. The substance can be applied during assembly in a simple manner to the existing elements of the circuit, in particular conductor and compensation potential. The assembly of the circuit is thereby influenced or prevented only insignificantly. Overall, the electrical / electronic circuit must not be structurally changed due to the advantageous method to derive an electrical overvoltage potential from the electrical conductor to the compensation potential.

Nach einer Weiterbildung der Erfindung wird als Substanz eine varistive und/oder resistive Substanz verwendet. Die varistive Substanz weist Varistor-Eigenschaften auf, die die Substanz temporär elektrisch leitfähig machen. Die varistive Substanz weist einen spannungsabhängigen Widerstand auf. Oberhalb einer bestimmten Schwellspannung wird der Widerstand abrupt kleiner, wobei die Kennlinie symmetrisch zur Spannung ist, sodass die Polarität keine Rolle spielt. Dadurch wird das Überspannungspotential, sobald es die Schwellspannung übersteigt, über die Substanz abgeleitet, da ihr Widerstand abrupt temporär kleiner wird. Die resistive Substanz weist einen Widerstand auf, der stets einen Stromfluss zulässt, sodass das Überspannungspotential abgeleitet wird, in dem stets Strom abgeführt wird. Das Verfahren bietet insbesondere einen Schutz vor elektrostatischen Entladungen (ESD-Schutz/ESD = Electro Static Discharge), sodass empfindliche elektrische/elektronische Elemente der Schaltung nicht durch eine Entladung eines Überpotentials beschädigt oder zerstört werden.According to a development of the invention, the substance used is a varistive and / or resistive substance. The varistive substance has varistor properties, which make the substance temporarily electrically conductive. The varistive substance has a voltage-dependent resistance. Above a certain threshold voltage, the resistance decreases abruptly, whereby the characteristic curve is symmetrical to the voltage, so that the polarity is irrelevant. As a result, the overvoltage potential, as soon as it exceeds the threshold voltage, is dissipated via the substance, since its resistance becomes temporarily shorter temporarily. The resistive substance has a resistance that always allows a current flow, so that the overvoltage potential is dissipated, in which electricity is always dissipated. In particular, the method provides protection against electrostatic discharges (ESD protection / ESD = Electro Static Discharge) so that sensitive electrical / electronic elements of the circuit are not damaged or destroyed by a discharge of an overpotential.

Weiterhin ist vorgesehen, dass als Substanz ein Material verwendet wird, dem Varistor-Elemente und/oder elektrisch leitfähige Elemente beigemengt sind. Das Material als solches ist elektrisch nicht leitfähig und wird durch das Beimengen der Varistor-Elemente und/oder elektrisch leitfähiger Elemente elektrisch leitfähig, zumindest temporär, gemacht.Furthermore, it is provided that a material is used as the substance, the varistor elements and / or electrically conductive elements are added. The material as such is electrically nonconductive and is made electrically conductive, at least temporarily, by the incorporation of the varistor elements and / or electrically conductive elements.

Vorteilhafterweise werden dem Material Varistor-Kügelchen beigemengt. Diese lassen sich besonders gut in dem Material verteilen, sodass die varistiven Eigenschaften der Substanz an jeder Stelle der Substanz gewährleistet werden.Advantageously, varistor beads are added to the material. These can be distributed particularly well in the material, so that the varistiven properties of the substance are guaranteed at each point of the substance.

In einer vorteilhaften Ausführungsform der Erfindung wird die Substanz in pastöser, aushärtender Form aufgebracht. Bei der Montage wird also der Leiter mittels der pastösen Substanz beschichtet, die bis zum Ausgleichspotential führt. Durch die pastöse Form passt sich die Substanz vorteilhaft an den Leiter, das Ausgleichspotential und eventuell dazwischen liegende Elemente der Schaltung an. Dadurch ist die Substanz besonders einfach auftragbar und die Ableitung erstellbar. Anschließend härtet die Substanz aus und bildet ein festes Ableitungselement, das mit dem Leiter und dem Ausgleichspotential verbunden ist. Dadurch wird ein Lösen der Substanz im Betrieb dauerhaft verhindert. Insbesondere wenn die Substanz in Hintergriffausbildungen an Leiter und/oder Ausgleichspotential eindringt.In an advantageous embodiment of the invention, the substance is applied in pasty, hardening form. During assembly, therefore, the conductor is coated by means of the pasty substance, which leads to the compensation potential. Due to the paste-like form, the substance adapts advantageously to the conductor, the compensation potential and possibly intervening elements of the circuit. As a result, the substance is particularly easy to apply and derivation can be created. Subsequently, the substance hardens and forms a solid dissipation element, which is connected to the conductor and the compensation potential. As a result, a release of the substance during operation is permanently prevented. In particular, when the substance penetrates into the rear grip training on conductors and / or compensation potential.

Schließlich ist vorgesehen, dass als Substanz ein Kleber verwendet wird. Diese Substanz kann dabei zusätzlich oder anstatt eines elektrisch nicht leitenden Klebers aufgetragen werden. Die Substanz haftet somit an Leiter und Ausgleichspotential, wodurch ein dauerhafter Kontakt sicher gewährleistet ist. Wie oben beschrieben, wird dadurch die Montage der Schaltung nicht oder nur äußerst gering beeinflusst.Finally, it is provided that an adhesive is used as the substance. This substance can be applied in addition to or instead of an electrically non-conductive adhesive. The substance thus adheres to conductor and compensation potential, whereby a permanent contact is ensured safe. As described above, the assembly of the circuit is not or only minimally influenced.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Im Folgenden soll die Erfindung anhand einiger Figuren näher erläutert werden. Dazu zeigen

Figur 1
ein erstes Ausführungsbeispiel des erfindungsgemäßen Verfahrens,
Figur 2
ein zweites Ausführungsbeispiel des erfindungsgemäßen Verfahrens,
Figur 3
ein drittes Ausführungsbeispiel des erfindungsgemäßen Verfahrens,
Figur 4
ein viertes Ausführungsbeispiel des erfindungsgemäßen Verfahrens und
Figur 5
ein fünftes Ausführungsbeispiel des erfindungsgemäßen Verfahrens.
In the following, the invention will be explained in more detail with reference to some figures. Show this
FIG. 1
a first embodiment of the method according to the invention,
FIG. 2
A second embodiment of the method according to the invention,
FIG. 3
A third embodiment of the method according to the invention,
FIG. 4
A fourth embodiment of the method according to the invention and
FIG. 5
A fifth embodiment of the method according to the invention.

Ausführungsform(en) der ErfindungEmbodiment (s) of the invention

Die Figur 1 zeigt in einer schematischen Schnittdarstellung ein erstes Ausführungsbeispiel des erfindungsgemäßen Verfahrens zum Ableiten eines elektrischen Überspannungspotentials. Die Figur 1 zeigt eine Spulengruppe 1 eines Hydro-Aggregats eines Bremssystems. Die Spulengruppe 1 weist ein Gehäuse 2 auf, in dem eine Spule 3, bestehend aus einem Spulenträger 4 um den Windungen 5 der Spule 3 herum gewickelt sind. An einem Ende liegt der Spulenträger 5 mit einer Endplatte 6 an dem Gehäuse 2 an, an dem anderen Ende weist der Spulenträger 4 eine Endplatte 7 auf, von der Anschlussvorsprünge 8 durch Öffnungen des Gehäuses 2 nach außen ragen. Durch die Anschlussvorsprünge 8 sind elektrisch leitfähige Leiter 10 und 11 von der Spule 3 nach außen geführt, sodass die Spule 3 elektrisch über die Leiter 10 oder 11 kontaktiert werden kann. Das Gehäuse 2 ist elektrisch leitfähig und stellt ein Ausgleichspotential 12, insbesondere Massepotential 13 dar. Um ein Überspannungspotential von der Spule 3 abzuleiten, sodass an die spule 3 angeschlossene, empfindliche Elektronik-Elemente nicht gefährdet werden, wird auf den Leiter 11, den Anschlussvorsprung 9 sowie das Gehäuse 2 im Bereich des Anschlussvorsprungs 9 eine Substanz 14 aufgetragen, die temporär elektrisch leitfähig ist. In dem vorliegenden Ausführungsbeispiel wird eine varistive Substanz 15 als Substanz 14 verwendet. Die varistiven Eigenschaften der Substanz 14 führen dazu, dass bei Erreichen eines Schwellpotentials das Überspannungspotential von dem Leiter 11 zu dem Ausgleichspotential 12 beziehungsweise Massepotential 13 angeleitet wird, sodass die empfindliche Elektronik vor einer Entladung eines Überpotentials geschützt ist. Die Substanz 14 kann auf einfache Art und Weise in pastöser Form aufgetragen werden, wobei sie sich vorteilhaft an die geometrischen Gegebenheiten anpasst. Beim anschließenden Aushärten bildet die Substanz eine feste, temporär elektrisch leitfähige Verbindung von dem Leiter 11 zu dem Ausgleichspotential 12. Als Substanz 14 beziehungsweise als varistive Substanz 15 wird ein Material 16 verwendet, dem Varistor-Elemente, insbesondere Varistor-Kügelchen, beigemengt sind, die der Substanz 15 ihre varistive Eigenschaft verleiht.The FIG. 1 shows a schematic sectional view of a first embodiment of the method according to the invention for deriving an electrical overvoltage potential. The FIG. 1 shows a coil group 1 of a hydraulic unit of a brake system. The coil group 1 has a housing 2, in which a coil 3, consisting of a coil carrier 4 are wound around the turns 5 of the coil 3 around. At one end of the bobbin 5 is located with an end plate 6 on the housing 2, at the other end, the bobbin 4 an end plate 7, from the Terminal projections 8 project through openings of the housing 2 to the outside. By the connection projections 8 electrically conductive conductors 10 and 11 are guided by the coil 3 to the outside, so that the coil 3 can be electrically contacted via the conductors 10 or 11. The housing 2 is electrically conductive and represents a compensation potential 12, in particular ground potential 13. In order to derive an overvoltage potential from the coil 3, so that the coil 3 connected, sensitive electronic elements are not compromised, is on the conductor 11, the connection projection. 9 and the housing 2 in the region of the connection projection 9 a substance 14 applied, which is temporarily electrically conductive. In the present embodiment, a varistive substance 15 is used as the substance 14. The varistiven properties of the substance 14 cause that upon reaching a threshold potential, the overvoltage potential of the conductor 11 to the compensation potential 12 and ground potential 13 is instructed, so that the sensitive electronics is protected from discharging an overpotential. The substance 14 can be applied in a simple manner in pasty form, wherein it adapts advantageously to the geometric conditions. During the subsequent curing, the substance forms a solid, temporarily electrically conductive connection from the conductor 11 to the compensation potential 12. The substance 14 or varistive substance 15 used is a material 16 to which varistor elements, in particular varistor beads, are added gives substance 15 its varistic character.

Die Figur 2 zeigt in einem zweiten Ausführungsbeispiel die Spulengruppe 1, die bereits aus der Figur 1 bekannt ist, sodass hier lediglich auf die Unterschiede eingegangen werden soll. Anstelle des Auftragens der Substanz 14 wird in dem zweiten Ausführungsbeispiel der elektrisch nicht leitende Spulenträger 4 durch einen Spulenträger 17 ersetzt, der aus dem gleichen Material wie die varistive Substanz 15 besteht, sodass der Spulenträger 17 varistive Eigenschaften aufweist. Hierbei wird das Überspannungspotential über die Endplatten 6 und 7 direkt auf das Gehäuse 2 und somit auf das Ausgleichspotential 12 beziehungsweise Massepotential 13 abgeleitet. Bei der Fertigung beziehungsweise Montage der Spulengruppe 1 können die Arbeitsschritte/Montageschritte beibehalten werden, es wird lediglich der Spulenträge 17, der aus dem Material 16 besteht, eingebaut. Da der Spulenträger 17 dem Spulenträger 4 -geometrisch gesehen- im Wesentlichen entspricht, bleiben die Montageschritte gleich, sodass auch bei einer automatischen Montage kein erhöhter Aufwand erforderlich ist, um die Spulengruppe 1 zu montieren. Es müssen lediglich der ein elektrisch nicht leitendes Bauteil 18 darstellende Spulenträger 4 durch den ein temporär elektrisch leitfähiges Bauteil bildenden Spulenträger 17 ersetzt werden. Anstelle der varistiven Substanz 15 kann auch eine resistive Substanz verwendet werden, die stets elektrisch leitfähig ist und den Leiter 11 mit dem Ausgleichspotential 12 verbindet. Als resistive Substanz wird dazu vorteilhafterweise ein Material verwendet, dem elektrisch leitfähige Elemente, wie zum Beispiel elektrisch leitfähige Fäden und/oder Fasern beigemengt sind. Die resistive Substanz weist einen Widerstand auf, der stets einen Stromfluss vom Leiter 11 zum Ausgleichspotential 12 zulässt, sodass das Überspannungspotential nicht einen kritischen Wert erreicht. Die Leiter 10 und 11 können beispielsweise als Schneidklemmverbindungen zum einfachen Verbinden beispielsweise mit einem Steuergerät, ausgebildet sein. Natürlich kann auch der Leiter 11 mit der Substanz versehen werden.The FIG. 2 shows in a second embodiment, the coil group 1, already from the FIG. 1 is known, so that only the differences should be discussed here. Instead of applying the substance 14, the electrically non-conductive bobbin 4 is replaced by a bobbin 17 in the second embodiment, which consists of the same material as the varistive substance 15, so that the bobbin 17 has varistive properties. In this case, the overvoltage potential is discharged via the end plates 6 and 7 directly to the housing 2 and thus to the compensation potential 12 or ground potential 13. In the production or assembly of the coil group 1, the steps / assembly steps can be maintained, it is only the bobbin 17, which consists of the material 16, installed. Since the Coil carrier 17 the coil carrier 4 -geometrisch seen- substantially corresponds, the assembly steps remain the same, so that even with an automatic assembly no increased effort is required to mount the coil group 1. It is only necessary to replace the coil carrier 4, which represents an electrically non-conductive component 18, by the coil carrier 17, which forms a temporarily electrically conductive component. Instead of the varistiven substance 15 also a resistive substance can be used, which is always electrically conductive and connects the conductor 11 with the compensation potential 12. As a resistive substance to a material is advantageously used, the electrically conductive elements, such as electrically conductive threads and / or fibers are added. The resistive substance has a resistance which always allows a current flow from the conductor 11 to the compensation potential 12, so that the overvoltage potential does not reach a critical value. The conductors 10 and 11 may be formed, for example, as insulation displacement connections for easy connection, for example with a control unit. Of course, the conductor 11 may be provided with the substance.

Die Figuren 3 und 4 zeigen ein drittes und ein viertes Ausführungsbeispiel der Erfindung. Dargestellt ist schematisch ein Elektromotor 20, der an einer elektrisch leitfähigen Gehäuseplatte 21 anliegt, wobei durch eine Öffnung 22 ein Motorkontakte-Dom 23 führt, durch den zwei Leiter 24, 25 des Motors 20 führen. Um ein elektrisches Überspannungspotential von dem Motor 20 auf die elektrisch leitfähige Gehäuseplatte 21, welche das Ausgleichspotential 12 beziehungsweise Massepotential 13 bildet, abzuleiten, wird auf die Leiter 24 und 25, den Motorkontakte-Dom 23 sowie die Gehäuseplatte 21 im Bereich des Motorkontakte-Doms 23 die varistive Substanz 15 aufgebracht, wie in Figur 3 dargestellt. Alternativ wird statt des den Motorkontakte-Dom 23 bildenden, elektrisch nicht leitfähigen Bauteils 26 ein Bauteil 27 verwendet, das aus dem Material 16 besteht, wie in der Figur 4 dargestellt. Hierdurch kann auf einfache Art und Weise ein Überspannungspotential auf das Ausgleichspotential 12 abgeleitet werden.The FIGS. 3 and 4 show a third and a fourth embodiment of the invention. Shown schematically is an electric motor 20, which rests against an electrically conductive housing plate 21, wherein through an opening 22, a motor contact dome 23 leads through which two conductors 24, 25 of the motor 20 lead. To derive an electrical overvoltage potential from the motor 20 to the electrically conductive housing plate 21, which forms the compensation potential 12 and ground potential 13, is on the conductors 24 and 25, the motor contact dome 23 and the housing plate 21 in the region of the motor contact dome 23rd the varistive substance 15 applied as in FIG. 3 shown. Alternatively, instead of the motor contact dome 23 forming, electrically non-conductive component 26, a component 27 is used, which consists of the material 16, as in the FIG. 4 shown. As a result, an overvoltage potential can be derived on the compensation potential 12 in a simple manner.

Die Figur 5 zeigt in einem fünften Ausführungsbeispiel der Erfindung die Unterseite eines Steuergeräts 28, in dem ein Stanzgitter 29 einliegt, welches mehrere Stanzgitteranschlüsse 30, von denen hier nur einige mit Bezugszeichen versehen sind, in einer Reihe angeordnet sind. Um das Stanzgitter 29 in einem Gehäuseteil 31 des Steuergeräts 28 zu arretieren, ist ein Kleber 32 auf dem Gehäuseteil 31 aufgetragen, wobei die Stanzgitteranschlüsse 30 auf den Kleber 32 bei der Montage aufgedrückt werden. Um ein Überspannungspotential von dem Stanzgitter 29 auf das elektrisch leitfähige Gehäuseteil 31 abzuleiten, wird vorteilhafterweise anstelle des elektrisch nicht leitfähigen Klebers 32 eine Substanz 33 verwendet, die ein Kleber 34 ist und gleichzeitig varistive und/oder resistive Eigenschaften aufweist. In dem fünften Ausführungsbeispiel wird also anstelle des elektrisch nicht leitenden Klebers 32 der Kleber 34 verwendet, der varistive und/oder resistive Eigenschaften aufweist. Dadurch wird auf einfache Art und Weise eine Ableitung für ein elektrisches Überspannungspotential von dem Stanzgitter 29 auf das von dem Gehäuseteil 31 gebildeten Ausgleichspotential 35 geboten.The FIG. 5 shows in a fifth embodiment of the invention, the underside of a control unit 28 in which a stamped grid 29 rests, which a plurality of lead frame terminals 30, of which only a few are provided with reference numerals, are arranged in a row. In order to lock the stamped grid 29 in a housing part 31 of the controller 28, an adhesive 32 is applied to the housing part 31, wherein the leadframe terminals 30 are pressed onto the adhesive 32 during assembly. In order to derive an overvoltage potential from the stamped grid 29 on the electrically conductive housing part 31, a substance 33 which is an adhesive 34 and at the same time has varistive and / or resistive properties is advantageously used instead of the electrically non-conductive adhesive 32. In the fifth embodiment, instead of the electrically non-conductive adhesive 32, the adhesive 34 is used which has varistive and / or resistive properties. As a result, a derivation for an electrical overvoltage potential from the stamped grid 29 to the compensating potential 35 formed by the housing part 31 is provided in a simple manner.

Claims (7)

Verfahren zum Ableiten eines elektrischen Überspannungspotentials von einem elektrischen Leiter einer elektrischen/elektronischen Schaltung oder dergleichen zu einem Ausgleichspotential, dadurch gekennzeichnet, dass der Leiter mit einer stets oder temporär elektrisch leitfähigen Substanz beschichtet oder in Verbindung gebracht wird, die bis zu dem Ausgleichspotential führt und/oder dass ein an den Leiter angrenzendes elektrisch nicht leitendes Bauteil durch ein Bauteil ersetzt wird, das aus der Substanz besteht oder diese aufweist und sich bis zum Ausgleichspotential erstreckt.Method for deriving an electrical overvoltage potential from an electrical conductor of an electrical / electronic circuit or the like to a compensation potential, characterized in that the conductor is coated or brought into contact with an always or temporarily electrically conductive substance which leads to the equalization potential and / or that an electrically non-conductive component adjacent to the conductor is replaced by a component consisting of or comprising the substance and extending to the compensation potential. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass als Substanz eine varistive und/oder resistive Substanz verwendet wird.A method according to claim 1, characterized in that a varistive and / or resistive substance is used as the substance. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass als Substanz ein Material verwendet wird, dem Varistor-Elemente und/oder elektrisch leitfähige Elemente beigemengt sind.Method according to one of the preceding claims, characterized in that a material is used as the substance, the varistor elements and / or electrically conductive elements are added. Verfahren nach einem der vorhergehenden Ansprüchen, dadurch gekennzeichnet, dass dem Material Varistor-Kügelchen beigemengt werden.Method according to one of the preceding claims, characterized in that the material varistor beads are added. Verfahren nach einem der vorhergehenden Ansprüchen, dadurch gekennzeichnet, dass dem Material elektrisch leitfähige Fäden oder Fasern beigemengt werden.Method according to one of the preceding claims, characterized in that the material electrically conductive threads or fibers are added. Verfahren nach einem der vorhergehenden Ansprüchen, dadurch gekennzeichnet, dass die Substanz in pastöser, aushärtender Form aufgebracht wird.Method according to one of the preceding claims, characterized in that the substance is applied in pasty, hardening form. Verfahren nach einem der vorhergehenden Ansprüchen, dadurch gekennzeichnet, dass als Substanz ein Kleber verwendet wird.Method according to one of the preceding claims, characterized in that an adhesive is used than substance.
EP08103855A 2007-05-31 2008-05-07 Method of dissipating an electric over-voltage potential Withdrawn EP2009749A3 (en)

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