EP2223320B1 - Schaltung für ein kontaktrelay - Google Patents

Schaltung für ein kontaktrelay Download PDF

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Publication number
EP2223320B1
EP2223320B1 EP08851182A EP08851182A EP2223320B1 EP 2223320 B1 EP2223320 B1 EP 2223320B1 EP 08851182 A EP08851182 A EP 08851182A EP 08851182 A EP08851182 A EP 08851182A EP 2223320 B1 EP2223320 B1 EP 2223320B1
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EP
European Patent Office
Prior art keywords
contact
current
relay
control
resistor
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
EP08851182A
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English (en)
French (fr)
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EP2223320A1 (de
Inventor
Jean-Michel Rocher
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Renault SAS
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Renault SAS
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Publication date
Application filed by Renault SAS filed Critical Renault SAS
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/60—Auxiliary means structurally associated with the switch for cleaning or lubricating contact-making surfaces

Definitions

  • the invention relates to the field of electromagnetic relays and aims in particular a circuit for relays used in motor vehicles.
  • a relay is an electrical device in which an electrical phenomenon (current or voltage) controls the On / Off switching of a mechanical element (electromechanical relay) or an electronic element (static relay), which acts as a switch that the we can operate from a distance.
  • an inverting relay the current flowing in a rest or working contact may be insufficient to allow satisfactory cleaning of this contact. The relay can then clog up as and when there is no current flowing when the change of position of the mechanical element is requested.
  • one solution is to add a load resistance on the line between the rest point and the ground to reach the necessary current, called cleaning stream.
  • the current can flow directly into the load.
  • Other solutions consisting of adding a network of resistor (s), capacitor (s), diode (s) or else using contact relays under vacuum or with mercury contact make it possible to avoid fouling of the resting contact. .
  • these solutions are very expensive.
  • the use of mercury is being banned, and the use of a vacuum contact relay is limited in switching power.
  • An object of the present invention is to provide an improved circuit, simple and inexpensive, which allows the current to flow in the contact in a first position during the time between the start of the relay control and the effective switching of the contact in a second position and proceed thus to cleaning the contact.
  • the object of the invention is a circuit for contact relays comprising a power supply source, a control means, a relay comprising a coil supplied by said power supply source, the control means being adapted to control the switching of a contact of the relay from a first position to a second position, characterized in that it comprises means for circulating current capable of circulating a current in the contact in the first position, between the start of switching control of the contact between a first and a second position and its effective changeover in the second position.
  • FIG. 1 there is shown a circuit for preventing clogging of the idle contact, comprising an electromagnetic relay 1 for example with inverter contacts, powered by a power supply source.
  • the relay 1 has a coil 2 energized by a power source V lim or battery provided for controlling a contact.
  • a command 3 makes it possible to control the beginning of the control of the relay to effect the switching from a first position to a second position.
  • the contacts of the relay 1 can from a common point C, establish a contact R when the relay is at rest, then establish another contact T when the relay is at work.
  • control 3 is a MOSFET transistor, which makes it possible to control the start of the control of the relay in order to switch the first rest position R to the second work position T.
  • the coil 2 of the relay 1 powered by the power source is connected to the control 3.
  • the coil 2 When the command 3 is triggered, the coil 2 is energized, and the voltage applied to the coil 2 creates a current. This current produces an electromagnetic field at the end of the coil 2 which acts as an electromagnet. The magnetic field created when it is sufficient can then effectively switch the contact from the rest position R to the working position T.
  • Means capable of circulating the current in the rest contact R during the time between the start of the control 3 of the relay 1 and the actual switching to the working contact T are arranged between the rest contact R and the coil 2.
  • the means comprise a resistor 5 placed in series with a diode 6 on a circuit portion disposed between the contact in the first rest position R and the coil 2.
  • a terminal of the resistor 5 is disposed downstream of the resting contact R relative to the flow direction of the current, the other terminal of the resistor 5 being connected to the anode of the diode 6.
  • the cathode of the diode 6 is connected to a point of the circuit forming a node disposed downstream of the coil 2 and upstream of the control 3, relative to the direction of flow of the current.
  • the node is disposed upstream of the drain of the transistor relative to the flow direction of the current.
  • the value R cleaning of the resistor 5 is such that the intensity of the current V at ⁇ lim min R cleaning is substantially greater than the intensity of the current I flowing in the contact_première_position contact with the first rest position necessary to clean the contact, where V lim min represents the minimum supply voltage of the circuit.
  • the minimum cleaning current allowing the contacts not to become dirty is, for example, substantially 40 mA for relays used in a motor vehicle.
  • the power dissipated is 5.5mW while the dissipated power would be 900mW with a simple load resistance.
  • the resting contact does not become clogged and the dissipated power is minimum.
  • the diode 6 advantageously avoids current recirculation phenomena especially during intermediate switching phases.
  • the resistor 5 and the diode 6 thus make it possible to pass current into the rest contact R during the time separating the start of the relay control and the actual switching of the working contact T.
  • the resistor 5 is a positive temperature coefficient resistive element such as a thermistor similar to that used for the protection of electric motors against an excessive rise in temperature, made for example based on barium titanate, or type "resettable fuse" made of polymer material.
  • a resistive element When the relay does not switch, that is to say if it is faulty or if there is a connection fault of the relay control, and if the cleaning current is important, for example substantially 100 mA approximately, the resistive element will heat up, its resistance increases, and therefore limit the power dissipated by the circuit.
  • Such a resistive element makes it possible not to dissipate a significant power permanently. This resistive element provides protection against the risk of destruction of circuits in case of failure of the relay or its connection.
  • FIG. 2 there is shown a circuit for preventing fouling of the working contact T, comprising an electromagnetic relay 10 for example with inverter contacts, powered by a power supply source.
  • the relay 10 has a coil 20 supplied directly by a power supply V a lim or battery provided for the control of a contact.
  • a control 30, such as a MOSFET transistor, makes it possible to control the start of the control of the relay in order to switch from a first working position T to a second rest position R.
  • the coil 20 of the relay 10 powered by the source supply is connected to control 30. As figure 1 when the magnetic field created by the coil 20 is sufficiently weak, the contact can switch from the working position T to the rest position R.
  • Means capable of circulating the current in the working contact T during the time between the start of the relay control and the actual switching of the rest contact R are placed between the work contact T and the coil 20.
  • a resistor 50 is placed in series with a diode 60 on a circuit portion disposed between the working contact T and the coil 20.
  • a terminal of the resistor 50 is disposed downstream of the working contact T relative to the direction of flow of the current.
  • another terminal of the resistor 5 being connected to the anode of the diode 60.
  • the inverter means 40 such as a low power MOSFET transistor, is disposed between the cathode of the diode 60 and a point forming a node, disposed downstream of the coil 20 and upstream of the control 30 relative to the direction of circulation. current so that the current flowing in the resistor can be synchronized with the opening of the contact to be cleaned.
  • the cathode of the diode 60 is connected to the drain of the transistor 40.
  • the source of the transistor 40 is connected to a point of the circuit forming a node disposed downstream of the coil 20 and upstream of the control 30 relative to the flow direction of the current. This node is disposed upstream of the drain of the transistor 30 relative to the flow direction of the current.
  • the value of the resistor 50 is such that the intensity of the current is substantially greater than the intensity of the current I contact_première_position flowing in the contact first working position necessary to clean the contact, the duration of the changeover being dependent on the conditions of demagnetization of the coil 20 of relay 10.
  • the work contact does not get dirty and the dissipated power is minimum.
  • the circuit comprises both the means able to circulate the current in the rest contact R during the time between the start of the relay control and the actual switching of the working contact T, and the means capable of circulating the current in the work contact T during the time between the start of the relay control and the actual switching of the rest contact R.
  • Such a circuit advantageously allows to prevent the rest contact and the work contact s' fouling depending on the position of the relay at the time of ordering. A sufficient cleaning current is able to flow when relay control in the corresponding contact.
  • controls 3.30, and the inverter means 40 are given as non-limiting examples. Any other type of control whose switching times are sufficiently short of the order of 10 to 40 ms, with respect to the relay switching time, that is to say to support the extra current related to the resistance during the switching time of the relay, can be used.
  • the controls 3.30 and the inverter means 40 may for example be a bipolar transistor or a SMART or other type circuit.
  • Such a circuit simple to carry out, and inexpensive, makes it possible to pass the current in the resting contact R during the time separating the start of the control of the relay and the actual switching of the working contact T or in the working contact T during the time separating the start of the relay control and the actual switching of the R rest contact.
  • the cleaning current is sufficient and prevents clogging of the relay contacts and the dissipated power is minimum.

Landscapes

  • Relay Circuits (AREA)
  • Interface Circuits In Exchanges (AREA)

Claims (8)

  1. Schaltung für ein Relais mit Kontakten, die aufweist
    a. eine Stromquelle (Valim)
    b. eine Steuereinrichtung (3, 30)
    c. ein Relais (1, 10), das eine von der Stromquelle gespeiste Spule (2, 20) aufweist, wobei die Steuereinrichtung (3, 30) die Schaltung eines Kontakts des Relais von einer ersten Stellung in eine zweite Stellung steuern kann,
    dadurch gekennzeichnet, dass sie Einrichtungen für das Fließen von Strom aufweiset, die einen Strom im Kontakt in der ersten Stellung zwischen dem Beginn der Schaltsteuerung des Kontakts zwischen einer ersten und einer zweien Stellung und seinem tatsächlichen Umschalten in die zweite Stellung fließen lassen kann.
  2. Schaltung nach Anspruch 1, dadurch gekennzeichnet, dass die Einrichtungen zum Fließen von Strom hinter dem Kontakt der ersten Stellung und vor der Steuerung (3, 30) bezüglich der Fließrichtung des Stroms angeordnet sind.
  3. Schaltung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Einrichtungen zum Fließen von Strom einen Widerstand (5) in Reihe mit einer Diode (6) aufweisen, wobei eine Klemme des Widerstands (5) hinter dem Kontakt der ersten Stellung angeordnet ist, während die andere Klemme des Widerstands mit der Anode der Diode (6) verbunden ist.
  4. Schaltung nach Anspruch 3, dadurch gekennzeichnet, dass die Kathode der Diode (6) mit einem Punkt der Schaltung verbunden ist, der einen Knoten formt, der hinter der Spule (2) und vor der Steuerung (3) bezüglich der Fließrichtung des Stroms angeordnet ist, wobei der Kontakt in der ersten Stellung der Ruhekontakt ist.
  5. Schaltung nach Anspruch 3, dadurch gekennzeichnet, dass eine Umkehreinrichtung (40) zwischen der Kathode der Diode (60) und dem einen Knoten formenden Punkt hinter der Spule (20) und vor der Steuerung (30) bezüglich der Fließrichtung des Stroms angeordnet ist, wobei der Kontakt in der ersten Stellung der Arbeitskontakt ist.
  6. Schaltung nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, dass der Wert des Widerstands Reinigung (5, 50) derart ist, dass die Stärke des Stroms V a ⁢ lim min R Re inigung
    Figure imgb0004
     wesentlich höher ist als die Stärke des im Kontakt der ersten Stellung IKontakt_erste_stellung fließenden Stroms, wobei Va limmin die Mindestspeisespannung der Schaltung darstellt.
  7. Schaltung nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, dass der Widerstand (5) ein ohmsches Element mit positivem Temperaturkoeffizient ist.
  8. Schaltung nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, dass die Umkehreinrichtung (40) ein Transistor geringer Leistung ist.
EP08851182A 2007-11-23 2008-11-21 Schaltung für ein kontaktrelay Ceased EP2223320B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0759279A FR2924268B1 (fr) 2007-11-23 2007-11-23 Circuit pour relais a contacts
PCT/EP2008/066024 WO2009065942A1 (fr) 2007-11-23 2008-11-21 Circuit pour relais a contacts

Publications (2)

Publication Number Publication Date
EP2223320A1 EP2223320A1 (de) 2010-09-01
EP2223320B1 true EP2223320B1 (de) 2012-01-18

Family

ID=39524568

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08851182A Ceased EP2223320B1 (de) 2007-11-23 2008-11-21 Schaltung für ein kontaktrelay

Country Status (4)

Country Link
EP (1) EP2223320B1 (de)
AT (1) ATE542232T1 (de)
FR (1) FR2924268B1 (de)
WO (1) WO2009065942A1 (de)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54135340A (en) * 1978-04-12 1979-10-20 Nissan Motor Relay device
WO1996041358A1 (en) * 1995-06-07 1996-12-19 Transportation Safety Devices, Inc. Power disconnect switch

Also Published As

Publication number Publication date
FR2924268B1 (fr) 2010-02-26
WO2009065942A1 (fr) 2009-05-28
FR2924268A1 (fr) 2009-05-29
ATE542232T1 (de) 2012-02-15
EP2223320A1 (de) 2010-09-01

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