EP0044757B1 - Procédé pour reduire les perturbations radioélectriques engendrees lors du fonctionnement d'un interrupteur électrique - Google Patents

Procédé pour reduire les perturbations radioélectriques engendrees lors du fonctionnement d'un interrupteur électrique Download PDF

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Publication number
EP0044757B1
EP0044757B1 EP81400957A EP81400957A EP0044757B1 EP 0044757 B1 EP0044757 B1 EP 0044757B1 EP 81400957 A EP81400957 A EP 81400957A EP 81400957 A EP81400957 A EP 81400957A EP 0044757 B1 EP0044757 B1 EP 0044757B1
Authority
EP
European Patent Office
Prior art keywords
contacts
reducing
craters
switch
parasites
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.)
Expired
Application number
EP81400957A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0044757A1 (fr
Inventor
Georges Duhamel
Yves Boisot
Daniel Bontemps
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.)
ELECTRO MECANIQUE DU NIVERNAIS SELNI Ste
Original Assignee
Electromecanique du Nivernais Selni Ste
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 Electromecanique du Nivernais Selni Ste filed Critical Electromecanique du Nivernais Selni Ste
Priority to AT81400957T priority Critical patent/ATE11708T1/de
Publication of EP0044757A1 publication Critical patent/EP0044757A1/fr
Application granted granted Critical
Publication of EP0044757B1 publication Critical patent/EP0044757B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/06—Contacts characterised by the shape or structure of the contact-making surface, e.g. grooved

Definitions

  • the present invention relates to a method for reducing radio interference generated during the operation of an electrical switch.
  • contact break switches A large number of electrical devices are controlled by contact break switches.
  • Known contact breakers usually include contacts with a smooth smooth surface. During a closing of these contacts, the movable contact approaches the fixed contact and when the ignition distance is reached, an arc occurs and generates parasites as long as the contacts are not completely closed. When these contacts open, an arc appears as soon as a small spacing of the contacts has occurred. This arc gives rise to parasites and only extinguishes when the movable contact is distant from the fixed contact by a length greater than the ignition distance. Thus the switching operations performed by these known switches usually produce annoying radio interference.
  • the contacts are provided with divided surfaces in the form of striations (for example patent GB 877674) or heterogeneous asperities in points.
  • the document FR-E-59,947 describes two different methods (both chemical and physical) for obtaining irregular contact surfaces for electrical contacts.
  • the application of said methods leads to obtaining elementary contact surfaces having the form of small croters.
  • the present invention aims to avoid these drawbacks. It provides an economical process for reducing radio interference to a negligible level.
  • the method for reducing the radio disturbances generated during the operation of an electrical switch with opening and closing of non-abrupt contacts is characterized in that a switch such as the surface of at least one of the contacts is provided with a rough zone constituted by a multitude of craters.
  • the switch 1 comprises a base 2 in which are mounted a fixed contact 3 on a fixed support 4 and a movable contact 5 on an elastic blade 6 for example that of the known type, provided a central tab.
  • the opening and closing of these two contacts 3 and 5 are carried out by an insulating finger 7 which controls the position of the elastic blade 6 carrying the movable contact 5.
  • a screw 8 mounted in the base 2 acts as a stop and ensures the adjustment of the spacing of the movable contact 5 relative to the fixed contact 3, in their opening.
  • At least one of the fixed 3 and movable 5 contacts has a surface comprising at least one rough area.
  • This rough surface area has a multitude of small craters 9.
  • These craters 9 have a size of the order of several microns to a few hundred microns. Thanks to this particular surface condition of these contacts 3 and 5, their opening or closing generates radio interference only at a negligible level.
  • a comparative test illustrated in FIGS. 5 to 8 makes it possible to highlight the advantages provided by the switches chosen for the implementation of the invention compared to the contact switch switches of the conventional type with a smooth and smooth surface.
  • FIGS. 5 and 6 show the parasites due to both the opening and the closing of contacts of the type with a smooth and smooth surface
  • FIGS. 7 and 8 illustrate the parasites generated by both the opening and closing contacts with rough surfaces made up of craters, such as those, which have been chosen for the implementation of the invention.
  • the craters on the surface of these contacts 3 and 5 are obtained by stamping.
  • an anvil with imprint produced by electroerosion is used.
  • the contacts thus formed can be either welded to their support as shown in FIG. 3 or crimped onto the latter as shown in FIG. 4.
  • the insulating finger 7 which actuates the contacts 3 and 5 can be controlled manually or automatically.
  • the finger 7 is controlled by means of a capsule filled with a thermodilatable fluid.

Landscapes

  • Contacts (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Noise Elimination (AREA)
  • Push-Button Switches (AREA)
  • Circuits Of Receivers In General (AREA)
  • Keying Circuit Devices (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Manufacture Of Switches (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
EP81400957A 1980-07-11 1981-06-16 Procédé pour reduire les perturbations radioélectriques engendrees lors du fonctionnement d'un interrupteur électrique Expired EP0044757B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81400957T ATE11708T1 (de) 1980-07-11 1981-06-16 Verfahren zur verringerung der bei der betaetigung eines elektrischen schalters verursachten funkstoerungen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8015494 1980-07-11
FR8015494A FR2486706A1 (fr) 1980-07-11 1980-07-11 Interrupteur electrique a rupture de contacts a niveau negligeable de perturbations radioelectriques

Publications (2)

Publication Number Publication Date
EP0044757A1 EP0044757A1 (fr) 1982-01-27
EP0044757B1 true EP0044757B1 (fr) 1985-02-06

Family

ID=9244119

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81400957A Expired EP0044757B1 (fr) 1980-07-11 1981-06-16 Procédé pour reduire les perturbations radioélectriques engendrees lors du fonctionnement d'un interrupteur électrique

Country Status (7)

Country Link
EP (1) EP0044757B1 (da)
JP (1) JPS5749127A (da)
AT (1) ATE11708T1 (da)
DE (1) DE3168752D1 (da)
DK (1) DK154373C (da)
ES (1) ES268148Y (da)
FR (1) FR2486706A1 (da)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60105204A (ja) * 1983-11-14 1985-06-10 カルソニックカンセイ株式会社 可変抵抗器の製造方法とその製造装置
EP2851152B1 (en) * 2012-05-18 2018-04-25 Honda Motor Co., Ltd. Spot welding device and spot welding method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE495600A (da) * 1944-08-04
US2490020A (en) * 1946-02-11 1949-12-06 First Ind Corp Electrical contact
FR59947E (fr) * 1950-01-13 1954-09-21 Merlin Gerin Perfectionnements aux contacts électriques
DE1070302B (da) * 1959-09-30
FR1345137A (fr) * 1962-10-26 1963-12-06 Perfectionnement aux contacts pour régulateurs de tension ou d'intensité utilisables plus particulièrement sur véhicules automobiles

Also Published As

Publication number Publication date
FR2486706A1 (fr) 1982-01-15
JPS5749127A (en) 1982-03-20
DK308981A (da) 1982-01-12
ES268148U (es) 1983-05-01
ES268148Y (es) 1983-11-16
FR2486706B1 (da) 1984-04-20
DK154373C (da) 1989-04-10
DK154373B (da) 1988-11-07
DE3168752D1 (en) 1985-03-21
EP0044757A1 (fr) 1982-01-27
ATE11708T1 (de) 1985-02-15

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