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EP0909451A1 - Inductive charge control device - Google Patents

Inductive charge control device

Info

Publication number
EP0909451A1
EP0909451A1 EP97921876A EP97921876A EP0909451A1 EP 0909451 A1 EP0909451 A1 EP 0909451A1 EP 97921876 A EP97921876 A EP 97921876A EP 97921876 A EP97921876 A EP 97921876A EP 0909451 A1 EP0909451 A1 EP 0909451A1
Authority
EP
European Patent Office
Prior art keywords
opening
coil
transistor
pulse width
switch
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.)
Granted
Application number
EP97921876A
Other languages
German (de)
French (fr)
Other versions
EP0909451B1 (en
Inventor
Yves Guermeur
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.)
Schneider Electric Industries SAS
Original Assignee
Schneider Electric SE
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 Schneider Electric SE filed Critical Schneider Electric SE
Publication of EP0909451A1 publication Critical patent/EP0909451A1/en
Application granted granted Critical
Publication of EP0909451B1 publication Critical patent/EP0909451B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
    • H01H47/32—Energising current supplied by semiconductor device
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
    • H01F7/1844—Monitoring or fail-safe circuits
    • 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
    • H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
    • H01H47/32—Energising current supplied by semiconductor device
    • H01H47/325—Energising current supplied by semiconductor device by switching regulator
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
    • H01F2007/1888—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings using pulse width modulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
    • H01F7/1805—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current
    • H01F7/1811—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current demagnetising upon switching off, removing residual magnetism

Definitions

  • the present invention relates to a device for controlling an inductive load, in particular an electromagnet coil, with which a recovery diode is associated, this device comprising an electronic chopper switch arranged in series with the coil and controlled by a modulator. pulse width as a function of a signal delivered by a device for measuring the current of the coil.
  • Coil control devices of this type are well known.
  • the switch controlled by the pulse width modulator allows the coil to be supplied first with a high so-called inrush current in order to close the magnetic circuit of the electromagnet, then with a reduced current known as holding just necessary to keep the magnetic circuit closed.
  • a second so-called fast opening or fast falling transistor, requested by an opening control circuit is therefore interposed in known manner in series with the coil or in parallel with the coil. (See for example document DE-42 27 165 ).
  • the object of the invention is to enable the fast opening transistor to be controlled over wide ranges of supply voltage and under a floating voltage with respect to the voltage across the terminals of the coil.
  • the supply circuit of the pulse width modulator is a transformer converter with two secondary windings, one of which is connected to the pulse width modulator and the other of which is connected to the grid of the opening transistor via an opening switch activated by the opening signal.
  • the opening switch is preferably an optotransistor whose opening causes the discharge of the gate capacitance of the fast opening transistor.
  • a circuit comprising a comparator of the DC supply voltage with at least one threshold, the output of the comparator being connected to a call / hold delay element and to a opening delay device via a logic element provided with an input for a low level on-off signal.
  • Figure 1 schematically shows a control device according to the invention for a contactor coil.
  • FIG. 2 shows an exemplary embodiment of the control of the opening transistor in the device of FIG. 1.
  • the device shown is intended to control a coil B of an electromagnetic contactor or, possibly, the coils of two interdependent contactors associated in assembly inverter. It includes a chopping transistor T1 arranged in series with the coil, between the latter and a low potential point, for example 0 volts, and a fast opening transistor T2 also arranged in series with the coil, between the latter. and a line of high potential V +.
  • a recovery diode D is arranged in parallel with the series connection of the coil B and of the transistor T2.
  • the transistors T1 and T2 are preferably insulated gate transistors; these are MOS transistors, but they can also be bipolar transistors with an insulated gate known as IGBTs.
  • the coil B is connected directly to the line V + and the transistor T2 is arranged in series with the coil between the latter and its connection point to the diode D.
  • the transistor T2 and the diode D are placed in series and the coil B is arranged in parallel with the assembly T2, D.
  • the chopping transistor T1 is connected to the output of a pulse modulator circuit 11 included in a controller circuit 10.
  • a sensor 12 of the current flowing in the coil B is connected to the circuit 11 via a peak intensity detector 13.
  • the elements making up circuit 11 or associated with circuit 11 are usual and will not be described further.
  • Transistors T1, T2 are n-channel IGBT or MOS components.
  • the device has on the one hand supply and control terminals 14 making it possible to supply the various electronic circuits and to determine the start and stop of the contactor by means of a switch not indicated and on the other hand a terminal 15 control to determine the on and off of the contactor by a low level signal S for example from an industrial bus or an appropriate control member such as a programmable controller.
  • the supply and control terminals 14 are connected via a filter 16 to a rectifier 17 whose output at potential V +, considered below as potential continuous, is connected to transistor T2, to controller circuit 10 and to a transformer converter 20.
  • the converter 20 comprises two secondary windings 21, 22 (see FIG. 2).
  • the windings 21, 22 are respectively connected by conductors 23, 24 to the controller circuit 10 to supply the latter and to an isolated control opening switch 25; the switch 25, for example an optotransistor, is controlled by the controller 10 via a conductor 26 to turn on or block the transistor T2 in order to power the coil or not.
  • the conductor 26 is connected to an opening control circuit 27 which comprises an analog or digital comparator 28 of the voltage applied to the controller circuit 10 by the conductor 23.
  • a logic element 29 receives on the one hand the signal leaving the comparator 28 and on the other hand the signal S applicable to circuit 10 via terminal 15; the output of the logic element 29 is connected on the one hand to a call delay / hold member 30a connected to the modulator 1, and on the other hand to an opening delay member 30b to which the conductor 26 is connected
  • the opening delay member 30b for example of the RC type, makes it possible to adjust the blocking delay of the transistor T2 and therefore the fallout time of the electromagnet.
  • the transistor T3 of the optical component 25 is located so as to allow the discharge of the gate capacitance of the transistor T2 when T3 is blocked.
  • a Zener Z diode is arranged in parallel to T2 to protect the latter.
  • the controller circuit 10 can be a microcontroller provided with inputs 31 for selecting the size of the coil of the associated contactor.
  • the microcontroller can also be provided with doubled inputs and outputs 26, 26 ′ for controlling the coils of two mutually associated contactors as an inverter.
  • the device shown operates as follows.
  • Coil B is assumed to be initially not supplied, so that the magnetic circuit of the contactor's electromagnet is open.
  • the switch not shown which is associated with the terminals 14 is closed, which applies the DC voltage V + to the drain of T2, to the controller circuit 10 and to the converter 20.
  • the transistor of the opening switch 25 is passed through the circuit 10 and the gate of the opening transistor T2 is therefore polarized; it follows that T2 is conducting and that, as T1 is also conducting, the coil B is supplied with an inrush current, then a holding current lower than the inrush current when the pulse modulator circuit 11 comes into operation .
  • the switch associated with terminals 14 is opened, so that the supply voltage of the circuit decreases from its level V +.
  • the delay member 30 applies with the predetermined delay a signal to the optotransistor 25 which is blocked.
  • the T2 grid discharges and T2 freezes. A rapid fallout of the electromagnet is thus obtained.
  • the same rapid opening operation can be obtained by switching the low-level signal S presented at terminal 15.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Relay Circuits (AREA)
  • Electronic Switches (AREA)
  • Dc-Dc Converters (AREA)

Abstract

Device for controlling an inductive charge, particularly, of an electromagnetic coil, comprising a chopper switch in series with the coil and governed by a pulse width modulator, and an opening switch which is also mounted in series with the coil. A transfomer converter (20) has two secondary windings, of which one is connected to the modulator (11) and the other one is connected to the grid of the opening transistor (T2) via a switch (25) biased by the opening signal.

Description

Dispositif de commande d'une charge inductive. Inductive load control device.
La présente invention concerne un dispositif de commande d'une charge inductive, notamment d'une bobine d'électroaimant, à laquelle est associée une diode de récupération, ce dispositif comprenant un interrupteur électronique hacheur disposé en série avec la bobine et commandé par un modulateur de largeur d'impulsions en fonction d'un signal délivré par un organe de mesure du courant de la bobine.The present invention relates to a device for controlling an inductive load, in particular an electromagnet coil, with which a recovery diode is associated, this device comprising an electronic chopper switch arranged in series with the coil and controlled by a modulator. pulse width as a function of a signal delivered by a device for measuring the current of the coil.
Les dispositifs de commande de bobine de ce type sont bien connus. L'interrupteur commandé par le modulateur de largeur d'impulsions permet d'alimenter la bobine d'abord avec un courant élevé dit d'appel afin de fermer le circuit magnétique de l'électroaimant, puis avec un courant réduit dit de maintien juste nécessaire pour garder le circuit magnétique fermé. Il est d'autre part connu d'alimenter le modulateur de largeur d'impulsions au moyen d'un circuit de tension continue à partir d'une source continue ou du réseau alternatif. Dans un tel dispositif, on cherche parfois à obtenir une ouverture rapide du circuit magnétique de l'électroaimant ; or le courant de roue libre qui continue de circuler dans la bobine via la diode de récupération après le blocage du transistor hacheur retarde cette ouverture. On interpose donc de façon connue en série avec la bobine ou en parallèle à la bobine un deuxième transistor dit d'ouverture rapide ou de retombée rapide, sollicité par un circuit de commande d'ouverture (voir par exemple le document DE-42 27 165).Coil control devices of this type are well known. The switch controlled by the pulse width modulator allows the coil to be supplied first with a high so-called inrush current in order to close the magnetic circuit of the electromagnet, then with a reduced current known as holding just necessary to keep the magnetic circuit closed. It is also known to supply the pulse width modulator by means of a DC voltage circuit from a DC source or from the AC network. In such a device, it is sometimes sought to obtain a rapid opening of the magnetic circuit of the electromagnet; however the freewheeling current which continues to circulate in the coil via the recovery diode after the blocking of the chopping transistor delays this opening. A second so-called fast opening or fast falling transistor, requested by an opening control circuit, is therefore interposed in known manner in series with the coil or in parallel with the coil. (See for example document DE-42 27 165 ).
L'invention a pour but de permettre de commander le transistor d'ouverture rapide sur de larges plages de tension d'alimentation et sous une tension flottante par rapport à la tension aux bornes de ia bobine. Selon l'invention, le circuit d'alimentation du modulateur de largeur d'impulsions est un convertisseur à transformateur à deux enroulements secondaires dont l'un est relié au modulateur de largeur d'impulsions et dont l'autre est relié à la grille du transistor d'ouverture par l'intermédiaire d'un interrupteur d'ouverture sollicité par le signal d'ouverture. L'interrupteur d'ouverture est de préférence un optotransistor dont l'ouverture entraîne la décharge de la capacité de grille du transistor d'ouverture rapide.The object of the invention is to enable the fast opening transistor to be controlled over wide ranges of supply voltage and under a floating voltage with respect to the voltage across the terminals of the coil. According to the invention, the supply circuit of the pulse width modulator is a transformer converter with two secondary windings, one of which is connected to the pulse width modulator and the other of which is connected to the grid of the opening transistor via an opening switch activated by the opening signal. The opening switch is preferably an optotransistor whose opening causes the discharge of the gate capacitance of the fast opening transistor.
Il est avantageusement commandé par un circuit comprenant un comparateur de la tension continue d'alimentation avec au moins un seuil, la sortie du comparateur étant reliée à un élément de temporisation d'appel/maintien et à un organe de temporisation d'ouverture via un élément logique muni d'une entrée pour un signal bas niveau marche-arrêt.It is advantageously controlled by a circuit comprising a comparator of the DC supply voltage with at least one threshold, the output of the comparator being connected to a call / hold delay element and to a opening delay device via a logic element provided with an input for a low level on-off signal.
La description qui suit d'un mode de réalisation non limitatif de l'invention, en regard des figures annexées, fera comprendre comment l'invention peut être mise en pratique.The following description of a non-limiting embodiment of the invention, with reference to the appended figures, will make it clear how the invention can be put into practice.
La figure 1 représente schématiquement un dispositif de commande conforme à l'invention pour une bobine de contacteur.Figure 1 schematically shows a control device according to the invention for a contactor coil.
La figure 2 montre un exemple de réalisation de la commande du transistor d'ouverture dans le dispositif de la figure 1. Le dispositif représenté est destiné à commander une bobine B de contacteur électromagnétique ou, éventuellement, les bobines de deux contacteurs interdépendants associés en montage inverseur. Il comprend un transistor hacheur T1 disposé en série avec la bobine, entre celle-ci et un point de potentiel bas, par exemple 0 volt, et un transistor d'ouverture rapide T2 disposé lui aussi en série avec la bobine, entre celle-ci et une ligne de potentiel haut V+. Une diode de récupération D est disposée en parallèle avec le montage série de la bobine B et du transistor T2. Les transistors T1 et T2 sont de préférence des transistors à grille isolée ; il s'agit ici de transistors MOS, mais il peut s'agir également de transistors bipolaires à grille isolée dits IGBT. Dans une variante, la bobine B est connectée directement à la ligne V+ et le transistor T2 est disposé en série avec la bobine entre celle-ci et son point de connexion à la diode D. Dans une autre variante, le transistor T2 et la diode D sont mis en série et la bobine B est disposée en parallèle à l'ensemble T2, D.FIG. 2 shows an exemplary embodiment of the control of the opening transistor in the device of FIG. 1. The device shown is intended to control a coil B of an electromagnetic contactor or, possibly, the coils of two interdependent contactors associated in assembly inverter. It includes a chopping transistor T1 arranged in series with the coil, between the latter and a low potential point, for example 0 volts, and a fast opening transistor T2 also arranged in series with the coil, between the latter. and a line of high potential V +. A recovery diode D is arranged in parallel with the series connection of the coil B and of the transistor T2. The transistors T1 and T2 are preferably insulated gate transistors; these are MOS transistors, but they can also be bipolar transistors with an insulated gate known as IGBTs. In one variant, the coil B is connected directly to the line V + and the transistor T2 is arranged in series with the coil between the latter and its connection point to the diode D. In another variant, the transistor T2 and the diode D are placed in series and the coil B is arranged in parallel with the assembly T2, D.
Le transistor hacheur T1 est relié à la sortie d'un circuit modulateur d'impulsions 11 inclus dans un circuit contrôleur 10. Un capteur 12 du courant circulant dans la bobine B est relié au circuit 11 via un détecteur d'intensité crête 13. Les éléments composant le circuit 11 ou associés au circuit 11 sont usuels et ne seront pas davantage décrits. Les transistors T1 ,T2 sont des composants IGBT ou MOS à canal n.The chopping transistor T1 is connected to the output of a pulse modulator circuit 11 included in a controller circuit 10. A sensor 12 of the current flowing in the coil B is connected to the circuit 11 via a peak intensity detector 13. The elements making up circuit 11 or associated with circuit 11 are usual and will not be described further. Transistors T1, T2 are n-channel IGBT or MOS components.
Le dispositif présente d'une part des bornes 14 d'alimentation et de commande permettant d'alimenter les différents circuits électroniques et de déterminer la marche et l'arrêt du contacteur au moyen d'un interrupteur non indiqué et d'autre part une borne 15 de commande permettant de déterminer la marche et l'arrêt du contacteur par un signal S à bas niveau provenant par exemple d'un bus industriel ou d'un organe de commande approprié tel qu'un automate programmable. Les bornes d'alimentation et de commande 14 sont reliées via un filtre 16 à un redresseur 17 dont la sortie au potentiel V+, considéré ci-après comme potentiel continu, est connectée au transistor T2, au circuit contrôleur 10 et à un convertisseur à transformateur 20.The device has on the one hand supply and control terminals 14 making it possible to supply the various electronic circuits and to determine the start and stop of the contactor by means of a switch not indicated and on the other hand a terminal 15 control to determine the on and off of the contactor by a low level signal S for example from an industrial bus or an appropriate control member such as a programmable controller. The supply and control terminals 14 are connected via a filter 16 to a rectifier 17 whose output at potential V +, considered below as potential continuous, is connected to transistor T2, to controller circuit 10 and to a transformer converter 20.
Selon l'invention, le convertisseur 20 comprend deux enroulements secondaires 21 ,22 (voir figure 2). Les enroulements 21 ,22 sont reliés respectivement par des conducteurs 23,24 au circuit contrôleur 10 pour alimenter celui-ci et à un interrupteur d'ouverture à commande isolée 25 ; l'interrupteur 25, par exemple un optotransistor, est commandé par le contrôleur 10 via un conducteur 26 pour rendre passant ou bloquer le transistor T2 afin d'alimenter ou non la bobine. Le conducteur 26 est raccordé à un circuit de commande d'ouverture 27 qui comprend un comparateur 28 analogique ou numérique de la tension appliquée au circuit contrôleur 10 par le conducteur 23. Un élément logique 29 reçoit d'une part le signal sortant du comparateur 28 et d'autre part le signal S applicable au circuit 10 par la borne 15 ; la sortie de l'élément logique 29 est reliée d'une part à un organe de temporisation d'appel/maintien 30a relié au modulateur 1 , et d'autre part à un organe de retard d'ouverture 30b auquel se raccorde le conducteur 26. L'organe de retard d'ouverture 30b, par exemple du type RC, permet d'ajuster le retard de blocage du transistor T2 et donc le temps de retombée de l'électroaimant.According to the invention, the converter 20 comprises two secondary windings 21, 22 (see FIG. 2). The windings 21, 22 are respectively connected by conductors 23, 24 to the controller circuit 10 to supply the latter and to an isolated control opening switch 25; the switch 25, for example an optotransistor, is controlled by the controller 10 via a conductor 26 to turn on or block the transistor T2 in order to power the coil or not. The conductor 26 is connected to an opening control circuit 27 which comprises an analog or digital comparator 28 of the voltage applied to the controller circuit 10 by the conductor 23. A logic element 29 receives on the one hand the signal leaving the comparator 28 and on the other hand the signal S applicable to circuit 10 via terminal 15; the output of the logic element 29 is connected on the one hand to a call delay / hold member 30a connected to the modulator 1, and on the other hand to an opening delay member 30b to which the conductor 26 is connected The opening delay member 30b, for example of the RC type, makes it possible to adjust the blocking delay of the transistor T2 and therefore the fallout time of the electromagnet.
Comme on le voit figure 2, le transistor T3 du composant optique 25 est situé de manière à permettre la décharge de la capacité de grille du transistor T2 quand T3 se bloque. Une diode Zener Z est disposée en parallèle à T2 pour protéger celui-ci.As seen in Figure 2, the transistor T3 of the optical component 25 is located so as to allow the discharge of the gate capacitance of the transistor T2 when T3 is blocked. A Zener Z diode is arranged in parallel to T2 to protect the latter.
Le circuit contrôleur 10 peut être un microcontrôleur doté d'entrées 31 pour sélectionner le calibre de la bobine du contacteur associé. Le microcontrôleur peut aussi être doté d'entrées et de sorties 26,26' doublées pour commander les bobines de deux contacteurs mutuellement associés en inverseur.The controller circuit 10 can be a microcontroller provided with inputs 31 for selecting the size of the coil of the associated contactor. The microcontroller can also be provided with doubled inputs and outputs 26, 26 ′ for controlling the coils of two mutually associated contactors as an inverter.
Le dispositif représenté fonctionne de la façon suivante.The device shown operates as follows.
La bobine B est supposée initialement non alimentée, de sorte que le circuit magnétique de l'électroaimant du contacteur est ouvert. Pour fermer ce circuit magnétique, on ferme l'interrupteur non représenté qui est associé aux bornes 14, ce qui applique la tension continue V+ au drain de T2, au circuit contrôleur 10 et au convertisseur 20. Le transistor de l'interrupteur d'ouverture 25 est rendu passant par le circuit 10 et la grille du transistor d'ouverture T2 est donc polarisée ; il en résulte que T2 est passant et que, comme T1 est également passant, la bobine B est alimentée avec un courant d'appel, puis un courant de maintien inférieur au courant d'appel quand le circuit modulateur d'impulsions 11 entre en oeuvre. Pour ouvrir le circuit magnétique, on ouvre l'interrupteur associé aux bornes 14, de sorte que la tension d'alimentation du circuit diminue depuis son niveau V+. Lorsqu'elle atteint le seuil du comparateur 28, l'organe de retard 30 applique avec le retard prédéterminé un signal à l'optotransistor 25 qui se bloque. La grille de T2 se décharge et T2 se bloque. On obtient ainsi une retombée rapide de l'électroaimant. La même opération d'ouverture rapide peut être obtenue par la commutation du signal à bas niveau S présenté à la borne 15. Coil B is assumed to be initially not supplied, so that the magnetic circuit of the contactor's electromagnet is open. To close this magnetic circuit, the switch not shown which is associated with the terminals 14 is closed, which applies the DC voltage V + to the drain of T2, to the controller circuit 10 and to the converter 20. The transistor of the opening switch 25 is passed through the circuit 10 and the gate of the opening transistor T2 is therefore polarized; it follows that T2 is conducting and that, as T1 is also conducting, the coil B is supplied with an inrush current, then a holding current lower than the inrush current when the pulse modulator circuit 11 comes into operation . To open the magnetic circuit, the switch associated with terminals 14 is opened, so that the supply voltage of the circuit decreases from its level V +. When it reaches the threshold of comparator 28, the delay member 30 applies with the predetermined delay a signal to the optotransistor 25 which is blocked. The T2 grid discharges and T2 freezes. A rapid fallout of the electromagnet is thus obtained. The same rapid opening operation can be obtained by switching the low-level signal S presented at terminal 15.

Claims

Revendications claims
1 . Dispositif de commande d'une charge inductive, notamment d'une bobine d'électroaimant, à laquelle est associée une diode de récupération, comprenant - un interrupteur électronique hacheur disposé en série avec la bobine et commandé par un modulateur de largeur d'impulsions en fonction d'un signal délivré par un organe de mesure du courant de la bobine,1. Device for controlling an inductive load, in particular an electromagnet coil, with which a recovery diode is associated, comprising - an electronic chopper switch arranged in series with the coil and controlled by a pulse width modulator in function of a signal delivered by a device for measuring the current of the coil,
- le modulateur de largeur d'impulsions étant alimenté par un circuit d'alimentation en tension continue et inclus dans un circuit contrôleur, - un interrupteur électronique d'ouverture rapide constitué par un transistor à grille isolée disposé en série avec la bobine ou en parallèle à la bobine et commandable par un signal d'ouverture délivré par le circuit contrôleur, caractérisé par le fait que le circuit (20) d'alimentation du modulateur de largeur d'impulsions (11) est un convertisseur à transformateur à deux enroulements secondaires dont l'un (21) est relié au modulateur de largeur d'impulsions et dont l'autre (22) est relié à la grille du transistor d'ouverture (T2) par l'intermédiaire d'un interrupteur d'ouverture (25) sollicité par te signal d'ouverture.- the pulse width modulator being supplied by a DC voltage supply circuit and included in a controller circuit, - an electronic rapid opening switch constituted by an insulated gate transistor arranged in series with the coil or in parallel to the coil and controllable by an opening signal delivered by the controller circuit, characterized in that the supply circuit (20) of the pulse width modulator (11) is a transformer converter with two secondary windings, one (21) is connected to the pulse width modulator and the other (22) of which is connected to the gate of the opening transistor (T2) via an opening switch (25) requested by the opening signal.
2 . Dispositif selon la revendication 1 , caractérisé par le fait que l'interrupteur d'ouverture (25) est un optotransistor dont l'ouverture entraîne la décharge de la capacité de grille du transistor d'ouverture rapide (T2).2. Device according to claim 1, characterized in that the opening switch (25) is an optotransistor, the opening of which causes the discharge of the gate capacitance of the fast opening transistor (T2).
3 . Dispositif selon la revendication 1 , caractérisé par le fait que l'interrupteur d'ouverture (25) est commandé par un comparateur (28) de la tension continue d'alimentation avec au moins un seuil, la sortie du comparateur étant reliée à un organe de temporisation d'appel/maintien (30a) et à un organe de retard d'ouverture (30b) via un élément logique (29) muni d'une entrée pour un signal (S) de commande à bas niveau.3. Device according to claim 1, characterized in that the opening switch (25) is controlled by a comparator (28) of the DC supply voltage with at least one threshold, the output of the comparator being connected to a member call / hold time delay (30a) and an opening delay member (30b) via a logic element (29) provided with an input for a low level control signal (S).
4 . Dispositif selon la revendication 1 , caractérisé par le fait que le transistor d'ouverture (T2) est shuntable.4. Device according to claim 1, characterized in that the opening transistor (T2) is shuntable.
5 . Dispositif selon la revendication 1, caractérisé par le fait que le circuit contrôleur (10) est un microcontrôleur doté d'entrées (31) de sélection de calibre de bobines de contacteurs et d'entrées et sorties affectées aux bobines de deux contacteurs associés en inverseur. 5. Device according to claim 1, characterized in that the controller circuit (10) is a microcontroller provided with inputs (31) for selecting the size of the contactor coils and of inputs and outputs assigned to the coils of two contactors associated in inverter .
EP97921876A 1996-04-25 1997-04-24 Inductive charge control device Expired - Lifetime EP0909451B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9605404A FR2748167B1 (en) 1996-04-25 1996-04-25 DEVICE FOR CONTROLLING AN INDUCTIVE LOAD
FR9605404 1996-04-25
PCT/FR1997/000733 WO1997040509A1 (en) 1996-04-25 1997-04-24 Inductive charge control device

Publications (2)

Publication Number Publication Date
EP0909451A1 true EP0909451A1 (en) 1999-04-21
EP0909451B1 EP0909451B1 (en) 2000-06-14

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EP97921876A Expired - Lifetime EP0909451B1 (en) 1996-04-25 1997-04-24 Inductive charge control device

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US (1) US6031708A (en)
EP (1) EP0909451B1 (en)
JP (1) JP2000509201A (en)
KR (1) KR20000010556A (en)
CN (1) CN1216632A (en)
AU (1) AU722585B2 (en)
BR (1) BR9709185A (en)
CA (1) CA2252622A1 (en)
CZ (1) CZ341498A3 (en)
DE (1) DE69702314T2 (en)
ES (1) ES2147447T3 (en)
FR (1) FR2748167B1 (en)
PL (1) PL329524A1 (en)
WO (1) WO1997040509A1 (en)

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WO1997040509A1 (en) 1997-10-30
DE69702314T2 (en) 2000-12-14
CZ341498A3 (en) 1999-02-17
US6031708A (en) 2000-02-29
CA2252622A1 (en) 1997-10-30
AU722585B2 (en) 2000-08-10
KR20000010556A (en) 2000-02-15
PL329524A1 (en) 1999-03-29
CN1216632A (en) 1999-05-12
FR2748167A1 (en) 1997-10-31
AU2778397A (en) 1997-11-12
EP0909451B1 (en) 2000-06-14
DE69702314D1 (en) 2000-07-20
FR2748167B1 (en) 1998-06-05
BR9709185A (en) 1999-08-10
JP2000509201A (en) 2000-07-18
ES2147447T3 (en) 2000-09-01

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