WO2003022025A1 - Interrupteur de securite notamment destine a l'arret de securite d'installations industrielles - Google Patents

Interrupteur de securite notamment destine a l'arret de securite d'installations industrielles Download PDF

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Publication number
WO2003022025A1
WO2003022025A1 PCT/EP2002/008607 EP0208607W WO03022025A1 WO 2003022025 A1 WO2003022025 A1 WO 2003022025A1 EP 0208607 W EP0208607 W EP 0208607W WO 03022025 A1 WO03022025 A1 WO 03022025A1
Authority
WO
WIPO (PCT)
Prior art keywords
switching device
safety switching
ribbon cable
wires
component carrier
Prior art date
Application number
PCT/EP2002/008607
Other languages
German (de)
English (en)
Inventor
Gerhard Ehrlich
Original Assignee
Pilz Gmbh & Co.
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 Pilz Gmbh & Co. filed Critical Pilz Gmbh & Co.
Publication of WO2003022025A1 publication Critical patent/WO2003022025A1/fr

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0007—Casings
    • H05K9/002—Casings with localised screening
    • H05K9/0022—Casings with localised screening of components mounted on printed circuit boards [PCB]

Definitions

  • the present invention relates to a safety switching device, in particular for safely switching off industrial machine systems.
  • Such safety switching devices are well known due to their use in industrial production environments. For example, such a safety switching device is described in DE 197 07 241 C2.
  • the safety switching devices are primarily used to switch off industrial plants or industrial processes in a fail-safe manner depending on defined input signals. Input variables can be machine or process parameters. In addition, the input signals often come from protective grilles, covers, emergency stop switches, light barriers and the like.
  • the essential task of the safety switching device is to evaluate the defined input signals and, depending on this, to shut down the machine or the process, which must be done with an extremely high degree of reliability. Otherwise, health and life, for example of operators, are at risk.
  • the safety switching devices are therefore made intrinsically fail-safe with complex measures, and they require approval from the responsible supervisory authorities, such as the professional associations in Germany, before they are commissioned. These test the device's intrinsic failure safety based on relevant standards, such as the European standard EN 954-1. Safety switching devices in the sense of the present invention are therefore only devices which at least meet category 3 of the standard mentioned or a comparable safety standard. Within this group, however, the invention is not restricted to individual devices, so that, for example, fail-safe speed monitors or complex fail-safe controls are also covered by the term "safety switching device" chosen here.
  • An effective method is to surround the entire device or at least the sensitive circuit components with metal housings. This creates a Faraday shear or a galvanic cage, which keeps external electromagnetic interference from the components arranged inside. Conversely, such a metal housing can also serve to shield radiating components to such an extent that the radiation cannot penetrate "outwards" unhindered.
  • a safety switching device of the type mentioned at the outset which, with little additional production outlay, has an effective shielding of the sensitive components against electromagnetic interference radiation.
  • the effectiveness of the shielding must primarily depend on the safety requirements, i.e. measured against the requirements with regard to intrinsic failure safety.
  • a safety switching device with a component carrier on which at least one electronic component is arranged, and with a metallic shield which at least partially surrounds the electronic component for suppressing electromagnetic interference radiation, the shielding comprising a ribbon cable with a large number of includes parallel wires, and wherein the ribbon cable runs on at least one side of the electronic component.
  • Ribbon cables are sufficiently known in the prior art as means for connecting electrical assemblies.
  • ribbon cables are widely used for the electrical connection of the individual assemblies within personal computer systems (PCs).
  • the ribbon cables consist of a large number of wires that are insulated from each other and arranged parallel to each other, resulting in a wide, flat conductor bundle.
  • Such ribbon cables are sold by numerous manufacturers and in various specific forms.
  • Commercially available ribbon cables are, for example, the flat cable system 720, which is sold by Eberhard Köpf GmbH in 63920 geometricheubach, Germany.
  • Amphenol is Another well-known manufacturer, which sells commercially available cables under the type designations UL-Style 2651 or UL-Style 2697.
  • the basis of the present invention is the surprising finding that such commercially available ribbon cables can ensure adequate shielding of the electronic components of modern safety switching devices. This applies at least to ribbon cables of the aforementioned types and more generally to ribbon cables that have at least a grid dimension of up to 7 mm. Since the above-mentioned commercially available ribbon cables are mass-produced and can be obtained very inexpensively, an inexpensive, shielded safety switching device can be realized on the basis of the surprising finding by using the cables.
  • ribbon cables for shielding electronic components in safety switching devices a number of advantages.
  • ribbon cables are readily available as mass products and are extremely inexpensive.
  • they can be shaped without difficulty, so that the shielding can be very easily adapted to the existing needs and the available space.
  • subsequent screening at individual points in a larger circuit is also easily possible.
  • ribbon cables are easy to assemble and can therefore be easily integrated into the production process even in large quantities.
  • flat cables can be used to achieve very light shielding, whereas, for example, the use of known shielding plates noticeably increases the weight of the safety switching devices.
  • the wires of the ribbon cable are electrically connected to a constant potential. This measure differs significantly from the usual use of ribbon cables, via which signals with changing potential are usually transmitted. Because the wires, preferably all the wires of the ribbon cable, are connected to a constant potential, the effectiveness of the shielding is improved.
  • the constant potential is a ground potential.
  • a first end of the wires is attached to the component carrier.
  • the first end can be clamped or plugged in using plugs known per se.
  • plugs known per se Such connections have the advantage that the ribbon cable can be easily released again.
  • the first end of the wires is soldered to the component carrier. This is because it is extremely cost-effective.
  • the measure has the advantage that the ribbon cable is fixed in relation to the electronic components to be protected. This increases the robustness of the shielding and thereby the functional reliability of the safety switching device.
  • a second end of the wires is loose.
  • This measure is particularly advantageous in combination with the measure mentioned above, since it fixes the shielding ribbon cable on the one hand, while the components to be protected remain easily accessible on the other hand.
  • the loose second end can simply be folded aside so that the shielded components are accessible. Beyond that too perform any calibration work in the manufacture of the safety device very easily and therefore inexpensively.
  • the second end is completely isolated.
  • the safety switching device has a device housing with a housing wall, the housing wall holding the second end in a desired position.
  • This measure is particularly advantageous with regard to minimizing production costs, since the ribbon cable used for shielding is brought into the desired position when the component carrier is mounted in the device housing. Additional fixings or special assembly steps can therefore be reduced or even completely eliminated. The measure thus enables particularly cost-effective production.
  • the component carrier has a first and an opposite second side, the electronic component being arranged on the first side and wherein the second side has a flat metallization.
  • the flat metallization which can be, for example, a copper cladding of the component carrier known per se, contributes to the shielding of the electronic component.
  • the measure enables a further reduction in production costs, since the corresponding side of the electronic component no longer has to be shielded in any other way.
  • the ribbon cable surrounds the electronic component on the first side of the component carrier.
  • the wires of the ribbon cable are electrically conductively connected to the flat metallization.
  • the ribbon cable surrounds the component carrier from at least two sides.
  • the ribbon cable preferably surrounds the component carrier at least on the first and second sides in the sense of the configurations described above.
  • the measure leads to the component carrier and with it the component to be shielded being "wrapped" by the ribbon cable.
  • the previously described flat metallization can be dispensed with, which enables the production process to be optimized with regard to the production costs.
  • the measure is particularly suitable for retrofitting effective and inexpensive shielding in a very simple manner even with existing safety switching devices.
  • the shield further includes at least one metallic wall, in the area of which the ribbon cable runs.
  • a metallic wall in this sense can be a sheet metal or a grid, which is used in a manner known per se for shielding the electronic component.
  • This also includes a housing wall provided with conductive lacquer.
  • single walls, possibly a single wall are sufficient. It is therefore no longer necessary to install a complete metal housing.
  • the shielding can be optimized without giving up the basic advantages that result from the use of ribbon cables.
  • the ribbon cable does not require an electrically conductive contact with the metallic wall, at least for simpler shields, although such a contact is advantageous for a particularly effective shielding.
  • the shield contains at least two ribbon cables, which partially overlap.
  • the wires of the ribbon cable are cut to different lengths.
  • FIG. 1 shows a first embodiment of a safety switching device according to the invention in a cross-sectional view
  • FIG. 2 is a plan view of a ribbon cable used in the safety switching device according to FIG. 1,
  • Fig. 3 shows a second embodiment of a safety switching device according to the invention.
  • FIG. 4 shows a flat cable from the safety switching device according to FIG. 3 in a top view.
  • a safety switching device according to the invention is designated in its entirety by reference number 10.
  • the safety switching device 10 contains a component carrier 12 on which a number of components are arranged in a manner known per se.
  • a transistor 14, a resistor 16, an integrated circuit (IC) 18 and a capacitor 20 are shown here as examples.
  • the transistor 14, the resistor 16 and the capacitor 20 are contacted in a manner known per se via bores 22 to the rear side 24 of the component carrier 12 and soldered there with soldering points 26.
  • the IC 18 is contacted in known SMD technology on the front 28 of the component carrier 12.
  • the reference numbers 30 and 32 denote two ribbon cables, which correspond to the surprising finding Shielding of the components 14 to 20 can be used, in particular for shielding the IC 18.
  • the ribbon cables 30, 32 one of which is shown again in FIG. 2, have a first end 34 and a second end 36. These are commercially available ribbon cables with a multiplicity of cores 38 arranged parallel to one another and insulated from one another.
  • the pitch of the The ribbon cable 30, 32 used here is 2.54 mm, but larger grid dimensions can also be used. Smaller grid dimensions increase the height of the shielding, so that there are no limits in this regard.
  • the first end 34 of the ribbon cable 30, 32 is stripped so that the wires 38 emerge from the cable jacket there.
  • the second end 36 is provided with a separate insulation 40.
  • the two ribbon cables 30, 32 as well as the components 14, 16 and 20 are contacted through holes 22 on the rear side 24 of the component carrier. There they are soldered to a flat metallization 42 applied to the back 24.
  • the metallization 42 has ground potential. Consequently, the individual cores of the ribbon cables 30, 32 are also at a constant ground potential.
  • the loose second ends 36 of the ribbon cables 30, 32 are folded from the right or from the left over the components 14 to 20 to be shielded and overlap in the central region of the component carrier 12. This creates an effective shielding at least with regard to electromagnetic interference radiation, which can impair the functionality of safety switching devices. On the other hand, it is very easy to repair the components 14 to 20 for repair purposes by folding the loose ends 36 of the two ribbon cables 30, 32 aside.
  • the safety switching device 10 is installed in a device housing 44 in a manner known per se.
  • the device housing 44 consists of two housing halves which are put together during assembly in the direction of arrow 45 and locked via a locking mechanism.
  • a particularly inexpensive assembly of the shielding results for the present exemplary embodiment, since the housing dimensions are dimensioned such that the loose second ends 36 of the two ribbon cables 30, 32 are brought from a housing wall 46 of the housing 44 into the desired overlapping position and are held there ,
  • a further exemplary embodiment of a safety switching device according to the invention is designated in its entirety by reference number 60 in FIG. 3. Otherwise, the same reference numerals designate the same elements as before.
  • the safety switching device 60 differs from the safety switching device 10 primarily in the manner in which the ribbon cable, which is designated here by the reference number 62, is used for shielding.
  • the ribbon cable 62 surrounds the component carrier 12 both on the front and on the back.
  • the components 14 to 20 to be shielded are surrounded on two sides, so that the flat metallization 42 of the component carrier 12 can be omitted.
  • the wires 38 of the ribbon cable 62 are, as before, at a constant shield potential.
  • the ribbon cable 62 which is shown again in a more detailed illustration in FIG. 4, is provided at its second end 64 in a manner known per se with a commercially available ribbon cable plug 66. With this plug 66, the ribbon cable 62 is detachably attached to the underside of the component carrier 12. The counterpart of the plug 66 is soldered to the component carrier 12 in a manner known per se.
  • the ribbon cable 62 is cut to different lengths at its first end 68.
  • the wires 38 are stripped at the respective ends as before.
  • the different positions of the first ends 68 enable the ribbon cable 62 to be fastened very flexibly to the component carrier 12, as is shown by way of example in FIG. 3.
  • the ends of the ribbon cable 62 of different lengths are soldered to the front of the component carrier 12 at different locations. Overall, areas that are shielded in different ways can be produced in this way. These can also be used to shield the individual components 14 to 20 from one another.
  • FIG. 3 Another difference between the exemplary embodiment in FIG. 3 and the previously illustrated exemplary embodiment is the additional use of a metallic wall 70, which is arranged laterally of the IC 18 and perpendicular to the component carrier 12. The upper free end of the metallic wall 70 ends in the area of the ribbon cable 62, and the two form together see a Faraday 'cage for the IC 18.
  • a second wall (not shown here) is arranged in mirror image to the wall 70 on the other side of the IC 18.
  • ribbon cables enables a very simple, inexpensive and yet effective shielding of electronic components in safety switching devices.
  • the two exemplary embodiments shown are actually to be understood as examples.
  • the special features shown separately here can also be combined with each other in order to achieve optimal shielding.
  • both "rigid" ribbon cables (with solid individual wires) or flexible ribbon cables (individual conductors made of stranded wire) can be used.
  • the use of flexible ribbon cables is particularly advantageous for the arrangement according to FIG. 3, since these can be deformed more easily.
  • ribbon cables with solid individual wires are easier to solder.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

La présente invention concerne un interrupteur de sécurité notamment destiné à l'arrêt de sécurité d'installations industrielles. Cet interrupteur comprend un support de composants (12) sur lequel on place au moins un composant électronique (14, 16, 18, 20), et un blindage métallique qui entoure au moins partiellement le composant électronique (14, 16, 18, 20) et supprime les rayonnements électromagnétiques parasites. Ce blindage contient un câble plat (30, 32) qui est doté d'une pluralité de brins parallèles et passe au moins sur un côté du composant électronique (14, 16, 18, 20).
PCT/EP2002/008607 2001-08-28 2002-08-02 Interrupteur de securite notamment destine a l'arret de securite d'installations industrielles WO2003022025A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10142737.9 2001-08-28
DE2001142737 DE10142737B4 (de) 2001-08-28 2001-08-28 Sicherheitsschaltgerät, insbesondere zum sicheren Abschalten von industriellen Maschinenanlagen

Publications (1)

Publication Number Publication Date
WO2003022025A1 true WO2003022025A1 (fr) 2003-03-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2002/008607 WO2003022025A1 (fr) 2001-08-28 2002-08-02 Interrupteur de securite notamment destine a l'arret de securite d'installations industrielles

Country Status (2)

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DE (1) DE10142737B4 (fr)
WO (1) WO2003022025A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4903185A (en) * 1987-07-23 1990-02-20 Merlin Gerin Filtering device of the common mode disturbances affecting the printed circuit boards of a static power converter
US5112419A (en) * 1988-10-12 1992-05-12 Kitagawa Industries Co., Ltd. Method for producting strip cable
DE19620194A1 (de) * 1996-05-20 1997-11-27 Gunter Dipl Ing Langer Anordnung zur Reduzierung der elektromagnetischen Abstrahlung bei Leiterkarten und integrierten Schaltkreisen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2499309B1 (fr) * 1981-01-30 1986-04-04 Omron Tateisi Electronics Co Commutateur et relais electriques en particulier pour la commutation de signaux haute frequence
DE19524930C2 (de) * 1995-07-08 1998-10-29 Gunter Dipl Ing Langer Anordnung zur Reduzierung der elektromagnetischen Abstrahlung von Leiterkarten
DE19527974C2 (de) * 1995-07-24 1997-07-31 Elektro Montage Nord Ing Rudol Magnetische Abschirmung von elektrischen Einrichtungen
DE19707241C2 (de) * 1997-02-25 2000-05-31 Pilz Gmbh & Co Modulares Sicherheitsschaltgerät

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4903185A (en) * 1987-07-23 1990-02-20 Merlin Gerin Filtering device of the common mode disturbances affecting the printed circuit boards of a static power converter
US5112419A (en) * 1988-10-12 1992-05-12 Kitagawa Industries Co., Ltd. Method for producting strip cable
DE19620194A1 (de) * 1996-05-20 1997-11-27 Gunter Dipl Ing Langer Anordnung zur Reduzierung der elektromagnetischen Abstrahlung bei Leiterkarten und integrierten Schaltkreisen

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Publication number Publication date
DE10142737A1 (de) 2003-04-17
DE10142737B4 (de) 2007-02-15

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