WO2009065942A1 - Circuit for a contact relay - Google Patents

Circuit for a contact relay Download PDF

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Publication number
WO2009065942A1
WO2009065942A1 PCT/EP2008/066024 EP2008066024W WO2009065942A1 WO 2009065942 A1 WO2009065942 A1 WO 2009065942A1 EP 2008066024 W EP2008066024 W EP 2008066024W WO 2009065942 A1 WO2009065942 A1 WO 2009065942A1
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WO
WIPO (PCT)
Prior art keywords
contact
current
control
relay
resistor
Prior art date
Application number
PCT/EP2008/066024
Other languages
French (fr)
Inventor
Jean-Michel Rocher
Original Assignee
Renault S.A.S.
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 Renault S.A.S. filed Critical Renault S.A.S.
Priority to EP08851182A priority Critical patent/EP2223320B1/en
Priority to AT08851182T priority patent/ATE542232T1/en
Publication of WO2009065942A1 publication Critical patent/WO2009065942A1/en

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Classifications

    • 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.
  • the means for the flow of current may be arranged downstream of the contact of the first position and upstream of the control relative to the direction of flow of the current
  • the means for the flow of current may comprise a resistance in series with a diode, a terminal of said resistor being disposed downstream of the contact of the first position, the other terminal of the resistor being connected to the anode of the diode
  • the cathode of the diode can be connected to a point of the circuit forming a node disposed downstream of the coil and upstream of the control relative to the flow direction of the current
  • the contact in the first position being the resting contact
  • an inverter means can be arranged between the cathode of the diode and the point forming a node disposed downstream of the coil and upstream of the control relative to the flow direction of the current
  • the contact in the first position being the work contact
  • the value of the resistance may be such that the intensity of the current is substantially greater than the intensity of the current flowing in the contact of the first position
  • the inverter means may be a low power transistor.
  • FIG. a circuit according to the invention for a contact in a first rest position
  • FIG. 2 represents the diagram of a circuit according to the invention for a contact in a first working position.
  • FIG. 1 there is shown a circuit for preventing clogging of the rest contact, comprising an electromagnetic relay 1 for example with inverter contacts, powered by a power supply source.
  • the relay 1 has a 2 coil supplied by a power source V power supply 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 working 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 separating the start of the command 3 of the relay 1 and the actual changeover 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 y ⁇ iim est is greater than the intensity of the current I c contact _ first _ cleaning position flowing in the contact of the first rest position necessary for clean the contact, where V ahm 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.
  • substantially 40 mA for relays used in a motor vehicle.
  • the power dissipated is 5.5mW while the dissipated power would be 90OmW 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 toggle, 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 large, 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 work contact T, comprising an electromagnetic relay 10 for example with inverter contacts, powered by a power source.
  • the relay 10 has a coil 20 supplied directly by a power source V ⁇ hm 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 The power supply is connected to the control 30. As in FIG. 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 work contact T and the coil 20. A terminal of the resistor
  • the resistor 50 is disposed downstream of the working contact T relative to the flow direction of the current, the other 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 current intensity is substantially greater than the intensity of the current I touch prem ⁇ ère _ _ pos ⁇ t ⁇ on flowing in contact first working position necessary to clean the contact, the duration of the tilting being dependent conditions demagnetizing the coil 20 of the 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.

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Abstract

The invention relates to an electrical circuit comprising a power supply (Vsupply), a control means (3, 30) and a relay (1, 10) comprising a coil (2, 20) supplied by said power supply, the control means (3, 30) being capable of causing a contact of the relay to switch from a first position to a second position, characterized in that it includes current flow means capable of making a current flow through the contact in the first position, between the start of the controlling of the switching of the contact between a first position and a second position and its effective switch-over into the second position.

Description

CIRCUIT POUR RELAIS A CONTACTS CIRCUIT FOR CONTACT RELAY
L'invention concerne le domaine des relais électromagnétiques et vise en particulier un circuit pour relais utilisés dans les véhicules automobiles. Un relais est un appareil électrique dans lequel un phénomène électrique (courant ou tension) contrôle la commutation On/Off d'un élément mécanique (relais électromécanique) ou d'un élément électronique (relais statique), qui agit comme un interrupteur que l'on peut actionner à distance. Dans un relais inverseur, le courant circulant dans un contact repos ou travail peut être insuffisant pour permettre un nettoyage satisfaisant de ce contact. Le relais peut alors s'encrasser au fur et à mesure s'il n'y a pas de courant qui circule au moment où le changement de position de l'élément mécanique est demandé.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. In 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.
Pour avoir un courant suffisant dans le contact repos ou le contact travail apte à permettre un nettoyage satisfaisant de ce contact, une solution est d'ajouter une résistance de charge sur la ligne entre le point de repos et la masse pour atteindre le courant nécessaire, appelé courant de nettoyage. Ainsi lorsque la commande de basculement est demandée, le courant peut circuler directement dans la charge. Or cette solution conduit à dissiper en permanence une puissance importante dans la résistance. D'autres solutions consistant à ajouter un réseau de résistance(s), condensateur(s), diode(s) ou encore à utiliser des relais à contact sous vide ou à contact à mercure permettent d'éviter l'encrassement du contact de repos. Toutefois, ces solutions sont très coûteuses. De plus l'utilisation du mercure est en voie d'interdiction, et l'utilisation d'un relais à contact sous vide est limitée en pouvoir de commutation. Un but de la présente invention est de proposer un circuit amélioré, simple et peu coûteux qui permet au courant de circuler dans le contact dans une première position pendant le temps séparant le début de la commande du relais et le basculement effectif du contact dans une deuxième position et de procéder ainsi au nettoyage du contact. Dans ce but, l'objet de l'invention est un circuit pour relais à contacts comportant une source d'alimentation électrique, un moyen de commande, un relais comportant une bobine alimentée par ladite source d'alimentation électrique, le moyen de commande étant apte à commander la commutation d'un contact du relais d'une première position à une deuxième position, caractérisé en ce qu'il comporte des moyens pour la circulation de courant aptes à faire circuler un courant dans le contact dans la première position, entre le début de commande de commutation du contact entre une première et une deuxième position et son basculement effectif dans la deuxième position.To have a sufficient current in the resting contact or the working contact capable of allowing a satisfactory cleaning of this contact, 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. Thus when the switchover command is requested, the current can flow directly into the load. But this solution leads to permanently dissipate a significant power in the resistance. 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. . However, these solutions are very expensive. In addition 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. For this purpose, 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.
Selon d'autres caractéristiques, les moyens pour la circulation de courant peuvent être disposés en aval du contact de la première position et en amont de la commande relativement au sens de circulation du courant, - les moyens pour la circulation de courant peuvent comporter une résistance en série avec une diode, une borne de ladite résistance étant disposée en aval du contact de la première position, l'autre borne de la résistance étant reliée à l'anode de la diode, la cathode de la diode peut être reliée à un point du circuit formant un nœud disposé en aval de la bobine et en amont de la commande relativement au sens de circulation du courant, le contact dans la première position étant le contact repos, un moyen inverseur peut être disposé entre la cathode de la diode et le point formant un nœud disposé en aval de la bobine et en amont de la commande relativement au sens de circulation du courant, le contact dans la première position étant le contact travail, la valeur de la résistance peut être telle que l'intensité du courant est sensiblement supérieure à l'intensité du courant circulant dans le contact de la première position, - la résistance peut être un élément résistif à coefficient de température positif,According to other features, the means for the flow of current may be arranged downstream of the contact of the first position and upstream of the control relative to the direction of flow of the current, the means for the flow of current may comprise a resistance in series with a diode, a terminal of said resistor being disposed downstream of the contact of the first position, the other terminal of the resistor being connected to the anode of the diode, the cathode of the diode can be connected to a point of the circuit forming a node disposed downstream of the coil and upstream of the control relative to the flow direction of the current, the contact in the first position being the resting contact, an inverter means can be arranged between the cathode of the diode and the point forming a node disposed downstream of the coil and upstream of the control relative to the flow direction of the current, the contact in the first position being the work contact the value of the resistance may be such that the intensity of the current is substantially greater than the intensity of the current flowing in the contact of the first position, the resistor may be a resistive element with a positive temperature coefficient,
- le moyen inverseur peut être un transistor de faible puissance.the inverter means may be a low power transistor.
D'autres caractéristiques, buts et avantages de la présente invention apparaîtront à la lecture de la description détaillée qui va suivre, et en regard des dessins annexés, donnés à titre d'exemples non limitatifs et sur lesquels : la figure 1 représente le schéma d'un circuit selon l'invention pour un contact dans une première position repos, la figure 2 représente le schéma d'un circuit selon l'invention pour un contact dans une première position travail.Other features, objects and advantages of the present invention will appear on reading the detailed description which follows, and with reference to the appended drawings, given as non-limiting examples and in which: FIG. a circuit according to the invention for a contact in a first rest position, FIG. 2 represents the diagram of a circuit according to the invention for a contact in a first working position.
A la figure 1 on a représenté un circuit permettant d'éviter un encrassement du contact repos, comportant un relais électromagnétique 1 par exemple à contacts inverseurs, alimenté par une source d'alimentation électrique.In Figure 1 there is shown a circuit for preventing clogging of the rest contact, comprising an electromagnetic relay 1 for example with inverter contacts, powered by a power supply source.
Le relais 1 a une bobine 2 alimentée directement par une source d'alimentation Valimou batterie prévue pour la commande d'un contact.The relay 1 has a 2 coil supplied by a power source V power supply or battery provided for controlling a contact.
Une commande 3 permet de commander le début de la commande du relais pour réaliser le basculement d'une première position à une deuxième position. Tels que représentés, les contacts du relais 1 peuvent à partir d'un point commun C, établir un contact R lorsque le relais est au repos, puis établir un autre contact T lorsque le relais sera au travail.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. As shown, 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.
Dans la suite de la description, le sens de circulation du courant est représenté par les flèches 7.In the remainder of the description, the flow direction of the current is represented by the arrows 7.
A la figure 1 , la commande 3 est un transistor MOSFET, qui permet de commander le début de la commande du relais pour réaliser le basculement de la première position repos R à la deuxième position travail T.In FIG. 1, the 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 working position T.
La bobine 2 du relais 1 alimentée par la source d'alimentation est reliée à la commande 3. Lorsque la commande 3 est déclenchée, la bobine 2 est sous tension, et la tension appliquée à la bobine 2 crée un courant. Ce courant produit un champ électromagnétique à l'extrémité de la bobine 2 qui agit comme un électro-aimant. Le champ magnétique créé, lorsqu'il est suffisant peut alors faire basculer effectivement le contact de la position repos R à la position travail T. Des moyens aptes à faire circuler le courant dans le contact repos R pendant le temps séparant le début de la commande 3 du relais 1 et le basculement effectif vers le contact travail T, sont disposés entre le contact repos R et la bobine 2.The coil 2 of the relay 1 powered by the power source is connected to the control 3. 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 separating the start of the command 3 of the relay 1 and the actual changeover to the working contact T, are arranged between the rest contact R and the coil 2.
Les moyens comportent une résistance 5 placée en série avec une diode 6 sur une portion de circuit disposée entre le contact dans la première position repos R et la bobine 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.
Une borne de la résistance 5 est disposée en aval du contact repos R relativement au sens de circulation du courant, l'autre borne de la résistance 5 étant reliée à l'anode de la diode 6. La cathode de la diode 6 est reliée à un point du circuit formant un nœud disposé en aval de la bobine 2 et en amont de la commande 3, relativement au sens de circulation du courant. Le nœud est disposé en amont du drain du transistor relativement au sens de circulation du courant.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.
La valeur Rnettoyagede la résistance 5 est telle que l'intensité du courant y αiim__ est sgηsjkigηηgηt sup • érieure à l'intensité du courant Iccontact _ première _ position nettoyage circulant dans le contact de la première position repos nécessaire pour nettoyer le contact, où Vahm représente la tension d'alimentation minimum du circuit.The value R cleaning of the resistor 5 is such that the intensity of the current y α iim est is greater than the intensity of the current I c contact _ first _ cleaning position flowing in the contact of the first rest position necessary for clean the contact, where V ahm represents the minimum supply voltage of the circuit.
Le courant minimum de nettoyage permettant aux contacts de ne pas s'encrasser est par exemple sensiblement de 40 mA pour les relais utilisés dans un véhicule automobile. Par exemple pour une tension d'alimentation sensiblement de 12V, un délai de basculement du contact d'une durée de sensiblement 20ms, une fréquence de basculement de sensiblement 1 HZ, et pour un courant circulant dans le contact repos sensiblement de 150 mA, la puissance dissipée est de 5.5mW alors que la puissance dissipée serait de 90OmW avec une simple résistance de charge. Le contact repos ne s'encrasse pas et la puissance dissipée est minimum.The minimum cleaning current allowing the contacts not to become dirty is, for example, substantially 40 mA for relays used in a motor vehicle. For example, for a supply voltage of substantially 12V, a switchover delay of the contact of a duration of substantially 20ms, a switching frequency of substantially 1HZ, and for a current flowing in the contact rest substantially 150 mA, the power dissipated is 5.5mW while the dissipated power would be 90OmW with a simple load resistance. The resting contact does not become clogged and the dissipated power is minimum.
Une fois la commande 3 déclenchée, du courant circule instantanément dans la résistance 5 et le courant dans la bobine 2 augmente. Le contact qui était dans une première position, bascule dès que le courant dans la bobine 2 atteint une valeur seuil suffisante pour le basculement effectif du contact travail T. Ainsi, lors du basculement du relais de la position repos R vers la position travail T, il n'y a sensiblement plus de courant circulant dans la résistance 5 alors que le courant était suffisant au moment de la commutation.Once the command 3 is triggered, current flows instantaneously in the resistor 5 and the current in the coil 2 increases. The contact which was in a first position, switches as soon as the current in the coil 2 reaches a threshold value sufficient for the effective switching of the working contact T. Thus, when switching the relay from the rest position R to the working position T, there is substantially no current flowing in the resistor 5 while the current was sufficient at the moment of switching.
La diode 6 permet avantageusement d'éviter des phénomènes de recirculation de courant notamment pendant des phases intermédiaires de commutation. La résistance 5 et la diode 6 permettent ainsi de faire passer du courant dans le contact repos R pendant le temps séparant le début de la commande du relais et le basculement effectif du contact travail T.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.
Selon un autre mode de réalisation non représenté, la résistance 5 est un élément résistif à coefficient de température positif tel qu'une thermistance similaire à celle utilisée pour la protection des moteurs électriques contre une élévation excessive de la température, fabriquée par exemple à base de titanate de baryum, ou de type "fusible réarmable" en matériau polymère. Lorsque le relais ne bascule pas, c'est-à- dire s'il est défaillant ou s'il y a un défaut de connexion de la commande du relais, et si le courant de nettoyage est important, par exemple sensiblement de 100 mA environ, l'élément résistif va s'échauffer, sa résistance augmente, et par conséquent limiter la puissance dissipée par le circuit. Un tel élément résistif permet de ne pas dissiper en permanence une puissance importante. Cet élément résistif permet une protection contre les risques de destruction des circuits en cas de défaillance du relais ou de sa connexion.According to another embodiment not shown, 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. When the relay does not toggle, 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 large, 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.
A la figure 2, on a représenté un circuit permettant d'éviter un encrassement du contact travail T, comportant un relais électromagnétique 10 par exemple à contacts inverseurs, alimenté par une source d'alimentation électrique.In Figure 2, there is shown a circuit for preventing fouling of the work contact T, comprising an electromagnetic relay 10 for example with inverter contacts, powered by a power source.
Le relais 10 a une bobine 20 alimentée directement par une source d'alimentation Vαhmou batterie prévue pour la commande d'un contact. Une commande 30, telle qu'un transistor MOSFET, permet de commander le début de la commande du relais pour réaliser le basculement d'une première position travail T à une deuxième position repos R. La bobine 20 du relais 10 alimentée par la source d'alimentation est reliée à la commande 30. De même qu'à la figure 1 , lorsque le champ magnétique créé par la bobine 20 est suffisamment faible, le contact peut basculer de la position travail T à la position repos R.The relay 10 has a coil 20 supplied directly by a power source V αhm 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 The power supply is connected to the control 30. As in FIG. 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.
Des moyens aptes à faire circuler le courant dans le contact travail T pendant le temps séparant le début de la commande du relais et le basculement effectif du contact repos R, sont placés entre le contact travail T et la bobine 20.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.
Une résistance 50 est placée en série avec une diode 60 sur une portion de circuit disposée entre le contact travail T et la bobine 20. Une borne de la résistanceA resistor 50 is placed in series with a diode 60 on a circuit portion disposed between the work contact T and the coil 20. A terminal of the resistor
50 est disposée en aval du contact travail T relativement au sens de circulation du courant, l'autre borne de la résistance 5 étant reliée à l'anode de la diode 60.50 is disposed downstream of the working contact T relative to the flow direction of the current, the other terminal of the resistor 5 being connected to the anode of the diode 60.
Le moyen inverseur 40, tel qu'un transistor MOSFET de faible puissance, est disposé entre la cathode de la diode 60 et un point formant un nœud, disposé en aval de la bobine 20 et en amont de la commande 30 relativement au sens de circulation du courant de sorte que le courant circulant dans la résistance puisse être synchronisé avec l'ouverture du contact à nettoyer. La cathode de la diode 60 est reliée au drain du transistor 40. La source du transistor 40 est reliée à un point du circuit formant un nœud disposé en aval de la bobine 20 et en amont de la commande 30 relativement au sens de circulation du courant. Ce nœud est disposé en amont du drain du transistor 30 relativement au sens de circulation du courant.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.
La valeur de la résistance 50 est telle que l'intensité du courant est sensiblement supérieure à l'intensité du courant Icontact_premιère_posιtιon circulant dans le contact première position travail nécessaire pour nettoyer le contact, la durée du basculement étant dépendante des conditions de démagnétisation de la bobine 20 du relais 10.The value of the resistor 50 is such that the current intensity is substantially greater than the intensity of the current I touch premιère _ _ posιtιon flowing in contact first working position necessary to clean the contact, the duration of the tilting being dependent conditions demagnetizing the coil 20 of the relay 10.
Lors du basculement du relais de la première position travail T vers la deuxième position repos R, il n'y a sensiblement plus de courant circulant dans la résistance 50 alors qu'il y en avait assez au moment de la commutation.When switching the relay from the first work position T to the second rest position R, there is substantially no current flowing in the resistor 50 when there was enough at the time of switching.
Le contact travail ne s'encrasse pas et la puissance dissipée est minimum.The work contact does not get dirty and the dissipated power is minimum.
Dans un autre mode de réalisation non représenté, le circuit comporte à la fois les moyens aptes à faire circuler le courant dans le contact repos R pendant le temps séparant le début de la commande du relais et le basculement effectif du contact travail T, et les moyens aptes à faire circuler le courant dans le contact travail T pendant le temps séparant le début de la commande du relais et le basculement effectif du contact repos R. Un tel circuit permet avantageusement d'empêcher le contact repos et le contact travail de s'encrasser selon la position du relais au moment de la commande. Un courant de nettoyage suffisant est apte à circuler lors de la commande de relais dans le contact correspondant.In another embodiment not shown, 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.
Il sera compris que les commandes 3,30, et le moyen inverseur 40 sont donnés à titre d'exemples non limitatifs. Tout autre type de commande dont les délais de commutation sont suffisamment brefs de l'ordre de 10 à 40 ms, vis à vis du délais de basculement du relais, c'est-à-dire permettant de supporter le surcroît de courant lié à la résistance pendant la durée de la commutation du relais, peuvent être utilisés.It will be understood that the 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.
Les commandes 3,30 et le moyen inverseur 40 peuvent par exemple être un transistor bipolaire ou un circuit de type SMART ou autre.The controls 3.30 and the inverter means 40 may for example be a bipolar transistor or a SMART or other type circuit.
Un tel circuit, simple à réaliser, et peu coûteux, permet de faire passer le courant dans le contact repos R pendant le temps séparant le début de la commande du relais et le basculement effectif du contact travail T ou dans le contact travail T pendant le temps séparant le début de la commande du relais et le basculement effectif du contact repos R. Le courant de nettoyage est suffisant et évite l'encrassement des contacts de relais et la puissance dissipée est minimum. 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.

Claims

REVENDICATIONS
1. Circuit pour relais à contacts comportant a. une source d'alimentation électrique (Vahm) b. un moyen de commande (3,30) c. un relais (1 ,10) comportant une bobine (2,20) alimentée par ladite source d'alimentation électrique, le moyen de commande (3,30) étant apte commander la commutation d'un contact dudit relais d'une première position à une deuxième position, caractérisé en ce qu'il comporte des moyens pour la circulation de courant aptes à faire circuler un courant dans le contact dans la première position, entre le début de commande de commutation du contact entre une première et une deuxième position et son basculement effectif dans la deuxième position.1. Circuit for contact relays comprising a. a power source (V ahm ) b. control means (3, 30) c. a relay (1, 10) comprising a coil (2, 20) supplied by said power supply, the control means (3, 30) being able to control the switching of a contact of said relay from a first position to a second position, characterized in that it comprises means for the circulation of current able to circulate 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 tilting in the second position.
2. Circuit selon la revendication 1 caractérisé en ce que les moyens pour la circulation de courant sont disposés en aval du contact de la première position et en amont de la commande (3,30) relativement au sens de circulation du courant.2. Circuit according to claim 1 characterized in that the means for the current flow are disposed downstream of the contact of the first position and upstream of the control (3,30) relative to the flow direction of the current.
3. Circuit selon la revendication 1 ou 2 caractérisé en ce que les moyens pour la circulation de courant comportent une résistance (5) en série avec une diode (6), une borne de ladite résistance (5) étant disposée en aval du contact de la première position, l'autre borne de la résistance étant reliée à l'anode de la diode (6).3. Circuit according to claim 1 or 2 characterized in that the means for the flow of current comprise a resistor (5) in series with a diode (6), a terminal of said resistor (5) being arranged downstream of the contact of the first position, the other terminal of the resistor being connected to the anode of the diode (6).
4. Circuit selon la revendication 3 caractérisé en ce que la cathode de la diode (6) est reliée à un point du circuit formant un nœud disposé en aval de la bobine (2) et en amont de la commande (3) relativement au sens de circulation du courant, le contact dans la première position étant le contact repos.4. Circuit according to claim 3 characterized in that 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. current flow, the contact in the first position being the rest contact.
5. Circuit selon la revendication 3 caractérisé en ce qu'un moyen inverseur (40) est disposé entre la cathode de la diode (60) et le point formant un nœud disposé en aval de la bobine (20) et en amont de la commande (30) relativement au sens de circulation du courant, le contact dans la première position étant le contact travail.5. Circuit according to claim 3 characterized in that an inverter means (40) is disposed between the cathode of the diode (60) and the point forming a node disposed downstream of the coil (20) and upstream of the control (30) relative to the flow direction of the current, the contact in the first position being the working contact.
6. Circuit selon l'une des revendications 2 à 5, caractérisé en ce que la valeur de la résistance Rnefto3,α^ (5,50) est telle que l'intensité du courant y αhm°°n est sensiblement supérieure à l'intensité du courant circulant nettoyage dans le contact de la première position Icontact premιère _posmon , où Vahm représente la tension d'alimentation minimum du circuit.6. Circuit according to one of claims 2 to 5, characterized in that the value of the resistor R nefto3 , α ^ (5.50) is such that the intensity of the current y α hm °° n is substantially greater than the intensity of the circulating current cleaning in the contact of the first position I first contact _ posmon , where V ahm represents the minimum supply voltage of the circuit.
7. Circuit selon l'une des revendications 3 à 6, caractérisé en ce que la résistance (5) est un élément résistif à coefficient de température positif.7. Circuit according to one of claims 3 to 6, characterized in that the resistor (5) is a resistive element with a positive temperature coefficient.
8. Circuit selon l'une des revendications 5 à 7 caractérisé en ce que le moyen inverseur (40) est un transistor de faible puissance. 8. Circuit according to one of claims 5 to 7 characterized in that the inverter means (40) is a low power transistor.
PCT/EP2008/066024 2007-11-23 2008-11-21 Circuit for a contact relay WO2009065942A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP08851182A EP2223320B1 (en) 2007-11-23 2008-11-21 Circuit for a contact relay
AT08851182T ATE542232T1 (en) 2007-11-23 2008-11-21 CIRCUIT FOR A CONTACT RELAY

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0759279 2007-11-23
FR0759279A FR2924268B1 (en) 2007-11-23 2007-11-23 CIRCUIT FOR CONTACT RELAY

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WO2009065942A1 true WO2009065942A1 (en) 2009-05-28

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EP (1) EP2223320B1 (en)
AT (1) ATE542232T1 (en)
FR (1) FR2924268B1 (en)
WO (1) WO2009065942A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2423047A1 (en) * 1978-04-12 1979-11-09 Nissan Motor HIGH POWER ELECTRICAL EQUIPMENT USING ELECTRIC RELAYS
WO1996041358A1 (en) * 1995-06-07 1996-12-19 Transportation Safety Devices, Inc. Power disconnect switch

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2423047A1 (en) * 1978-04-12 1979-11-09 Nissan Motor HIGH POWER ELECTRICAL EQUIPMENT USING ELECTRIC RELAYS
WO1996041358A1 (en) * 1995-06-07 1996-12-19 Transportation Safety Devices, Inc. Power disconnect switch

Also Published As

Publication number Publication date
EP2223320B1 (en) 2012-01-18
EP2223320A1 (en) 2010-09-01
FR2924268A1 (en) 2009-05-29
ATE542232T1 (en) 2012-02-15
FR2924268B1 (en) 2010-02-26

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