EP1878036B1 - Disjoncteur-contacteur a moyen de blocage commande par un actuateur piezoelectrique - Google Patents

Disjoncteur-contacteur a moyen de blocage commande par un actuateur piezoelectrique Download PDF

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Publication number
EP1878036B1
EP1878036B1 EP06742642A EP06742642A EP1878036B1 EP 1878036 B1 EP1878036 B1 EP 1878036B1 EP 06742642 A EP06742642 A EP 06742642A EP 06742642 A EP06742642 A EP 06742642A EP 1878036 B1 EP1878036 B1 EP 1878036B1
Authority
EP
European Patent Office
Prior art keywords
movable contact
circuit breaker
piezoelectric actuator
contact
contactor
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.)
Not-in-force
Application number
EP06742642A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1878036A1 (fr
Inventor
Norbert Beyrard
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Publication of EP1878036A1 publication Critical patent/EP1878036A1/fr
Application granted granted Critical
Publication of EP1878036B1 publication Critical patent/EP1878036B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H57/00—Electrostrictive relays; Piezoelectric relays
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/127—Automatic release mechanisms with or without manual release using piezoelectric, electrostrictive or magnetostrictive trip units

Definitions

  • the invention relates to a circuit breaker-contactor more particularly comprising one or two fixed contacts, a movable contact relative to the fixed contacts between a closed position and an open position, a movable contact moving means in the position of closing, and means for moving the movable contact in the open position.
  • a circuit breaker-contactor of this type is known in particular from the document EP-A-1 058322 .
  • the moving means of the moving contact closure is a piezoelectric actuator.
  • an electronic control unit operates on the piezoelectric actuator to trigger the opening of the contacts at a specific time, for example at when the intensity or voltage in the main circuit passes through a point of zero intensity or voltage, called zero point.
  • the piezoelectric actuator keeps the moving contact in the closed position as long as the circuit breaker is closed. It has been found that in order to obtain a rapid cutoff when the contact pressure between the fixed contacts and the moving contact is high, it is necessary to have a powerful piezoelectric actuator, that is to say still relatively expensive to actual hour.
  • One of the aims of the invention is to design a circuit breaker-contactor that overcomes this disadvantage.
  • the subject of the invention is a circuit-breaker comprising one or two fixed contacts, a movable contact relative to the fixed contacts between a closed position and an open position, a means for moving the movable contact in the closing position, means for moving the movable contact in the open position, and means for locking the movable contact in the closed position, a piezoelectric actuator deforming from a rest position to a working position to move the locking means to allow the moving contact to be moved in the open position by the opening moving means, and an electronic supply and control unit supplying and deforming the piezoelectric actuator in the working position to move the locking means to unlock the moving contact, in response to an electrical intensity detected in the fixed contact or contacts.
  • the idea is to cause the opening of the main circuit by releasing the potential energy of a powerful elastic means, for example a spring, by moving the locking means of the movable contact.
  • a powerful elastic means for example a spring
  • the potential energy of the spring has been accumulated during movement of the movable contact in the closed position. The release of this potential energy causes an extremely fast opening of the circuit breaker-contactor.
  • the locking means is for example a pawl or a trigger. It can be integrated with the piezoelectric actuator so that the latter acts directly on the moving contact.
  • the blocking means is not integrated with the piezoelectric actuator but is designed in the form of a lever for amplifying the deformation of the piezoelectric actuator.
  • the electronic control unit can operate to allow the circuit breaker to open very exactly at a time when, for example, the intensity is close to zero, without it being caused arc or spark that may affect the life of the circuit breaker and the operation of electronic systems arranged downstream or upstream.
  • a circuit breaker-contactor comprises two contacts 1.3 fixed relative to each other, a contact 5 movable relative to the fixed contacts 1.3 between a closed position and an open position, and a means 7 moving the movable contact 5 in the closed position.
  • the circuit breaker-contactor also comprises a means 11 for blocking the movable contact 5 in the closed position, a piezoelectric actuator 13 deforming to move the locking means 11 to unlock the movable contact 5 and allow its movement in the position d opening, and an electronic control unit 15 deforming control the piezoelectric actuator 13 in response to an electrical intensity detected in the fixed contacts 1.3.
  • the housing has for example the following dimensions: length, 65 mm; depth, 30mm; height, 50 mm.
  • the contacts 1 and 3 are fixed with respect to the housing 17.
  • the movable contact 5 is carried by a carrier arm 19 mounted to rotate about an axis 21.
  • a spring 9 is disposed on each side of the support arm 19 about the axis 21. It rests on a stop 23 of the arm carrier 19 to be deformed in torsion about the axis 21 when the support arm 19 is rotated by the lever 7 serving as a means of manual movement.
  • the locking means 11 is in the form of a lever arm and acts by a pawl 27 on a locking spike 25 fixed to the support arm 19 to lock the movable contact 5 in the closed position.
  • the pawl 27 takes up the force exerted by the springs 9 deformed in torsion about the axis 21.
  • the piezoelectric actuator 13 comprises an elliptical frame 29 within which piezoelectric elements 31 are arranged.
  • the major axis 33 of the ellipse is elongated while the minor axis 35 is shortened relative to a rest position.
  • the piezoelectric actuator 13 raises the lever arm 11, secured to the frame 29 of the piezoelectric actuator 13 by an attachment point 39 disposed along the minor axis 35.
  • a ballast 37 is provided at the opposite the point of attachment 39 along the minor axis 35 to create a free-free resonance condition at a resonance frequency of the order of 1000 Hz.
  • the piezoelectric actuator 13 is deformed for a very short time to move the lever arm 11 pivotally mounted relative to the housing 17 about a fixed link 24 relative to the housing 17.
  • the lever arm allows to amplify the deformation of the piezoelectric actuator 13.
  • the piezoelectric actuator 13 thus raises the pawl 27 above the locking spout 25 to unlock the rotation of the support arm 19 under the action of the force stored by the torsion springs 9.
  • the movable contact 5 is rotated by the carrier arm 19 to open the circuit breaker-contactor.
  • the piezoelectric actuator 13 acts only to release the lock, that is to say to move the locking means 11 to unlock the movable contact 5 of the closed position under the action of the force stored by the resilient means 9.
  • the closure of the circuit breaker-contactor is performed by the handle 7 to move the carrier arm 19 and at the same time cause the locking of the movable contact 5 in the position of closing.
  • the pawl 27 is driven in displacement by the locking nose 25 to engage with the latter. During this movement, it plays on the bending of the lever arm between the pawl 27 and the attachment point 39, while the piezoelectric actuator 13 is in the rest position.
  • the distance of the movable contact 5 relative to the fixed contacts 1.3 to 3 mm, after 2.5 milliseconds is largely sufficient to interrupt an arc or a spark for voltages of 220 at 230 volts.
  • the release time of the pawl 27 is 0.5 milliseconds and the loss of contact time of 0.8 milliseconds. In total, between the pulse given ten milliseconds before the zero point, a delay of the order of 6 to 8 milliseconds is sufficient after the order to lead to an opening of the main circuit at a correct time.
  • the circuit breaker-contactor is connected to the main current circuit by a line 2 connected to the fixed contact 1 and by a flexible cable 4 connected to the moving contact 5.
  • the displacement means 7 moves with a first intermediate lever arm 6 between the support arm 19 and the locking means 11.
  • the pawl 25 is no longer attached to the support arm 19 but to this intermediate lever arm 6 movable about an axis of rotation 22 fixed relative to the housing 17.
  • the locking means 11 is an arm of lever mounted pivotably about an axis of rotation 24 fixed relative to the housing 17.
  • the spring 9 is integral with the movable contact 5 being attached to the carrier arm 19 at one end and the housing 17 at an opposite end to deform into elongation.
  • the piezoelectric actuator 13 is connected to the locking means 11 by a second intermediate lever arm 10, rotatably mounted about an axis of rotation 26 and integral with the piezoelectric actuator 13 by a fulcrum 38.
  • An arm transmission 12 connects the locking means 11 to the second intermediate arm 10.
  • the circuit breaker is in the closed position.
  • the locking means 11 blocks the rotation of the arm 19 carrying the movable contact 5 around the axis.
  • a spring 8 is attached to the second intermediate arm 10 at one end and to the housing 17 at an opposite end to hold the locking means in the locking position.
  • the piezoelectric actuator 13 is in the rest position.
  • the circuit breaker is in the open position.
  • the piezoelectric actuator 13 has deformed for a very short time in the working position, extending the minor axis 35 of the elliptical frame 29 and contracting the major axis 33.
  • This has resulted in a displacement of the second arm intermediate lever 10 pivoting about the axis of rotation 26, which has moved the locking means 11 pivotally about the axis of rotation 24 to raise the pawl 27 above the locking nose 25.
  • the second spring 8, integral with the intermediate lever arm 10 has compressed.
  • the unlocking of the pawl 27 has released the first intermediate lever arm 6 in rotation around the axis of rotation 22 and released the support arm 19 in rotation about the axis of rotation 21, under the action of the spring detent 9 integral with the arm 19 carrying the movable contact 5.
  • the piezoelectric actuator 13 is used only to lift the locking means 11 when opening the circuit breaker-contactor. In the open state, the piezoelectric actuator, no longer powered, returns to its rest position. To reset the circuit breaker-switch, it plays on the bending of the lever arm between the pawl 27 and the attachment point 39, as indicated above.
  • the piezoelectric actuator 13 is also used to lift the locking means 11 when opening the circuit breaker-contactor. And again, in the open state, the piezoelectric actuator 13 returns to its rest position. But to reset the circuit breaker-switch, it is necessary to deform it again in its working position to raise again the locking means 11 for a time necessary to allow the second intermediate arm 6 to pass below the pawl 27.
  • the two electronic chains are connected at 61 to an AND logic circuit.
  • the passing signal is then adjusted and amplified at 63. This signal then controls the piezoelectric actuator 13 for opening the circuit breaker-contactor.
  • the closing of the circuit breaker-contactor is carried out manually by means of the handle 7.
  • the closure can also be electrically controlled by a second piezoelectric actuator or by an electromagnetic actuator, consisting for example of an electromagnet operating only during the closing phase, so that, with the circuit-breaker closed, the power consumption is zero.
  • a solenoid 65 acts on the displacement means 7 of the arm 19 carrying the movable contact 5 to allow the closing of the circuit breaker-contactor, thanks to the translation of a movable rod 67.
  • Figure 3 the solenoid 65 is returned to a rest position.
  • displacement means of the movable opening contact, with hydraulic, pneumatic or vapor pressure action which can be substituted for the spring 9.
  • These displacement means are controlled by the electronic control unit 15 and their control is coordinated with the control of the piezoelectric actuator 13 moving the locking means 11 until the release of the movable contact 5.
  • the water can be replaced by a gas 74 which, under the effect of heating, produced for example by an electrical resistor 79 causes the movement of the bellows 77, which in turn acts to cause the closing of the contacts in place and placing the solenoid as described with reference to the preceding figures 6 and 7.
  • a gas 74 which, under the effect of heating, produced for example by an electrical resistor 79 causes the movement of the bellows 77, which in turn acts to cause the closing of the contacts in place and placing the solenoid as described with reference to the preceding figures 6 and 7.
  • Such control means are bistable and under these conditions, if the supply of the solenoid or control means which may be substituted for it, is cut when its action is completed, the power consumption is zero outside the operating periods .
  • the engagement can be carried out at any time if the pressure of the contacts is such that rebounds at the moment of contact are very limited. Time coordination is provided for the action of the solenoid 65 acting on the means of movement of the arm 19 carrying the movable contact 5 during the closing, and the action of the piezoelectric actuator 13 to enable the passage of the locking nose 25 below the pawl 27.
  • the closing or opening of the circuit breaker-contactor can be controlled remotely by any manual or automatic means.
  • a circuit breaker according to the invention can be miniaturized, which allows it to use for example a piezoelectric actuator for closing and another for opening and allows it to operate very quickly and therefore at higher frequencies.
  • the circuit breaker-contactor is thus capable of controlling the operating sequences of X-ray or laser beams used in particular in medical scanners, such as those described in the patent applications. FR 04.06497 and FR 04.52677 .

Landscapes

  • Breakers (AREA)
  • Keying Circuit Devices (AREA)
  • Push-Button Switches (AREA)
  • Electronic Switches (AREA)
  • Lock And Its Accessories (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
EP06742642A 2005-04-22 2006-04-21 Disjoncteur-contacteur a moyen de blocage commande par un actuateur piezoelectrique Not-in-force EP1878036B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0504141A FR2884962A1 (fr) 2005-04-22 2005-04-22 Contacteur disjoncteur a ouverture par declenchement a l'aide d'un actuateur piezo electrique.
PCT/EP2006/003704 WO2006111407A1 (fr) 2005-04-22 2006-04-21 Disjoncteur-contacteur a moyen de blocage commande par un actuateur piezoelectrique

Publications (2)

Publication Number Publication Date
EP1878036A1 EP1878036A1 (fr) 2008-01-16
EP1878036B1 true EP1878036B1 (fr) 2008-10-08

Family

ID=36729328

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06742642A Not-in-force EP1878036B1 (fr) 2005-04-22 2006-04-21 Disjoncteur-contacteur a moyen de blocage commande par un actuateur piezoelectrique

Country Status (7)

Country Link
US (1) US7528334B2 (ja)
EP (1) EP1878036B1 (ja)
JP (1) JP2008537301A (ja)
AT (1) ATE410781T1 (ja)
DE (1) DE602006003088D1 (ja)
FR (1) FR2884962A1 (ja)
WO (1) WO2006111407A1 (ja)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2434851A (en) * 2006-02-03 2007-08-08 Pbt A vibration resistant release mechanism
US8179018B2 (en) * 2009-08-25 2012-05-15 GM Global Technology Operations LLC Active material actuator regulation utilizing piezoelectric and piezoresistive effect
DE202011110339U1 (de) * 2011-07-29 2013-08-29 Ceramtec Gmbh Elektromagnetisches Relais

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO148061C (no) 1981-02-05 1986-05-13 Norsk Hydro As Fremgangsmaate for fremstilling av saltbelagte metallpartikler.
US4473859A (en) * 1982-09-22 1984-09-25 Piezo Electric Products, Inc. Piezoelectric circuit breaker
US5430597A (en) * 1993-01-04 1995-07-04 General Electric Company Current interrupting device using micromechanical components
DE4425330A1 (de) * 1993-07-26 1996-01-25 Siemens Ag Schalter zur Strombegrenzung
GB9704769D0 (en) * 1997-03-07 1997-04-23 Powerbreaker Plc Low component count release mechanism
DE10112563A1 (de) * 2001-03-15 2002-09-19 Kopp Heinrich Ag Vorrichtung zur Betätigung einer Auslösemechanik
DE10118098A1 (de) * 2001-04-11 2002-10-17 Abb Patent Gmbh Installationsschaltgerät
DE10340003B4 (de) * 2003-08-29 2006-02-16 Siemens Ag Kurzschluss- und Überlastauslöser für ein Schaltgerät

Also Published As

Publication number Publication date
US7528334B2 (en) 2009-05-05
US20080179170A1 (en) 2008-07-31
JP2008537301A (ja) 2008-09-11
FR2884962A1 (fr) 2006-10-27
DE602006003088D1 (de) 2008-11-20
EP1878036A1 (fr) 2008-01-16
WO2006111407A1 (fr) 2006-10-26
ATE410781T1 (de) 2008-10-15

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