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WO1999003121A1 - Dispositif de circuit pour reduire au minimum l'apparition d'arcs electriques au cours d'operations de connexion - Google Patents

Dispositif de circuit pour reduire au minimum l'apparition d'arcs electriques au cours d'operations de connexion Download PDF

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Publication number
WO1999003121A1
WO1999003121A1 PCT/GB1998/001886 GB9801886W WO9903121A1 WO 1999003121 A1 WO1999003121 A1 WO 1999003121A1 GB 9801886 W GB9801886 W GB 9801886W WO 9903121 A1 WO9903121 A1 WO 9903121A1
Authority
WO
WIPO (PCT)
Prior art keywords
switch
circuit means
contacts
load
developed
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.)
Ceased
Application number
PCT/GB1998/001886
Other languages
English (en)
Inventor
Paul Roy Gorton
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AU82247/98A priority Critical patent/AU8224798A/en
Publication of WO1999003121A1 publication Critical patent/WO1999003121A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H01H9/541—Contacts shunted by semiconductor devices
    • H01H9/542—Contacts shunted by static switch means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H01H9/541—Contacts shunted by semiconductor devices
    • H01H9/542—Contacts shunted by static switch means
    • H01H2009/546—Contacts shunted by static switch means the static switching means being triggered by the voltage over the mechanical switch contacts

Definitions

  • circuit means for minimising the generation of arcing between two contacts of a switch used to connect and disconnect alternating-current electrical power from a power supply to and from a load, which circuit means includes means responsive to a voltage developed across the two contacts of the switch as they separate and operable to connect the load directly to the power supply through the said circuit means until the waveform of the supply voltage passes through zero.
  • Figure 1 shows a load connected to an AC supply by way of a switch and one form of the circuit means of the invention
  • FIG. 2 shows the use of an alternative circuit means according to the invention.
  • the circuit means referred to above may take various forms but will preferably comprise one or more semiconductor devices connected in series with the load across the power supply and operable to conduct when a voltage is developed across it on the opening of the switch.
  • One example of a suitable semiconductor device is a triac.
  • a triac is an semiconductor device which acts as a bidirectional switch between its main terminals 16 and 17 and has a triggering or "gate" electrode 18. The operation of the device is controlled by a low current signal applied to the gate electrode 18. A low current of either polarity passing between main contact 16 and gate electrode 18 is able to control a substantially larger current flowing between the main terminals 16 and 17. To initiate switching of the triac, the control current needs to be of a few microseconds duration only. Once conduction is established between the main terminals of the triac with a current greater than the holding value, the gate current is no longer required until the main current falls below the holding value.
  • a load 10 which may be inductive or resistive, is connected to the live L and neutral N sides of a power supply (not shown) by way of a switch 11.
  • the switch has fixed contacts 12 and 13 and a movable contact 14.
  • the contacts 12 and 14 are closed when power is supplied to the load 10.
  • Connected across the contacts 12 and I is a triac 15, having main terminals % and 17 and a gate electrode 18, and a capacitor 19 and resistor 110 are connected in series between the gate electrode 18 and main terminal 17 of the triac. Power in disconnected from the load by moving the movable contact 14 of the switch from fixed contact 12 to fixed contact 13.
  • Figure 2 shows an alternative to the triac of Figure, which is replaced by two separate unidirectional triggered semiconductor devices 20 and 21 , each with its own resistor-capacitor network connected across it.
  • This arrangement operates in the same manner as the triac of Figure 1, with one or other of the semiconductor devices conducting when triggered, depending on the polarity of the supply voltage at the instant of triggering.
  • it is not possible to provide the electrical noise suppression by way of an additional switch contact, as was possible in the arrangement of Figure 1.
  • the values of the resistor and capacitor in either arrangement are chosen to suit the particular semiconductor device being used, so that a step in voltage between the trigger electrode of the device and the load of, say, 25 volts will result in the semiconductor device being rendered conducting.
  • the circuit does not require to be changed to suit different load characteristics, so long as the conducting semiconductor device is able to handle the maximum current and voltage requirements of the load for the short period necessary.

Landscapes

  • Keying Circuit Devices (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Abstract

L'invention concerne un dispositif de circuit qui permet de réduire au minimum l'apparition d'arcs électriques entre deux contacts (12, 14) d'un interrupteur (11) servant à connecter ou déconnecter une source d'alimentation en courant alternatif à partir d'une charge (10) ou vers cette dernière. Ce dispositif de circuit inclut un moyen (15) qui réagit à une tension développée aux bornes de deux contacts (12, 14) de l'interrupteur (11) pour connecter la charge (10) directement à la source d'alimentation par l'intermédiaire dudit dispositif de circuit, jusqu'à ce que la forme d'onde de la tension d'alimentation atteigne zéro. Ledit moyen (15) peut comprendre un dispositif à semi-conducteur bidirectionnel à déclenchement simple, tel qu'un Triac.
PCT/GB1998/001886 1997-07-11 1998-06-26 Dispositif de circuit pour reduire au minimum l'apparition d'arcs electriques au cours d'operations de connexion Ceased WO1999003121A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU82247/98A AU8224798A (en) 1997-07-11 1998-06-26 Circuit means for minimising arc generation during switching operations

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9714521.3A GB9714521D0 (en) 1997-07-11 1997-07-11 Circuit means for minimising ARC generation during switching operations
GB9714521.3 1997-07-11

Publications (1)

Publication Number Publication Date
WO1999003121A1 true WO1999003121A1 (fr) 1999-01-21

Family

ID=10815633

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/001886 Ceased WO1999003121A1 (fr) 1997-07-11 1998-06-26 Dispositif de circuit pour reduire au minimum l'apparition d'arcs electriques au cours d'operations de connexion

Country Status (3)

Country Link
AU (1) AU8224798A (fr)
GB (1) GB9714521D0 (fr)
WO (1) WO1999003121A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2047003A (en) * 1979-04-03 1980-11-19 Torrix Sa Ets Improvements in or relating to electric switching
JPS60119129A (ja) * 1983-12-01 1985-06-26 Matsushita Electric Ind Co Ltd スイッチング装置
EP0628975A2 (fr) * 1993-06-01 1994-12-14 Koninklijke Philips Electronics N.V. Circuit de suppression d'étincelle pour protection d'un interrupteur électrique, et dispositif électrique thermique comportant un tel circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2047003A (en) * 1979-04-03 1980-11-19 Torrix Sa Ets Improvements in or relating to electric switching
JPS60119129A (ja) * 1983-12-01 1985-06-26 Matsushita Electric Ind Co Ltd スイッチング装置
EP0628975A2 (fr) * 1993-06-01 1994-12-14 Koninklijke Philips Electronics N.V. Circuit de suppression d'étincelle pour protection d'un interrupteur électrique, et dispositif électrique thermique comportant un tel circuit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 009, no. 277 (E - 355) 6 November 1985 (1985-11-06) *

Also Published As

Publication number Publication date
AU8224798A (en) 1999-02-08
GB9714521D0 (en) 1997-09-17

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