EP0352391A1 - Control device for switching an electrical power circuit on and off - Google Patents

Control device for switching an electrical power circuit on and off Download PDF

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Publication number
EP0352391A1
EP0352391A1 EP88401993A EP88401993A EP0352391A1 EP 0352391 A1 EP0352391 A1 EP 0352391A1 EP 88401993 A EP88401993 A EP 88401993A EP 88401993 A EP88401993 A EP 88401993A EP 0352391 A1 EP0352391 A1 EP 0352391A1
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EP
European Patent Office
Prior art keywords
circuit
relays
control device
voltage
current
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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.)
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Application number
EP88401993A
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German (de)
French (fr)
Inventor
Bruno Paul Claude Marcoz
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Individual
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Individual
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Publication date
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Publication of EP0352391A1 publication Critical patent/EP0352391A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H01H9/56—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere for ensuring operation of the switch at a predetermined point in the ac cycle
    • 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
    • H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
    • H01H47/04—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current
    • 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
    • H01H47/002—Monitoring or fail-safe circuits

Definitions

  • the present invention relates to a device for opening and closing low-voltage electric power circuits, single-phase or multi-phase, comprising at least one relay provided with a control coil supplied with direct current at low voltage and at least one contact. of work incorporated in the power circuit associated with each phase.
  • the contacts used require to cut the current of the so-called "power" main circuits a large opening distance between contacts, which leads to oversizing the contact actuation coils. , their large dimensions make them unsuitable for ordering circuits made in printed circuits, and, finally, their price is high.
  • the present invention aims to overcome these drawbacks.
  • control device comprises an electronic circuit for excitation of a relay, adapted to supply the coil of the relay during the excitation period with a pulse current having the value necessary for the excitation. and then a current of lower value reduced to the value necessary for maintaining the relay, and electromagnetic overload detection means.
  • the device for control comprises a circuit for controlling the opening of the contacts at a value of the current passing through them, which is close to zero, advantageously in the event of an overload.
  • the current-voltage converter comprises a primary winding connected in series with the power circuit to be controlled and a secondary winding electrically connected to an overload detector circuit.
  • the electronic excitation circuit comprises a very low voltage source, means for producing said relay holding current from this voltage and means for producing the higher excitation current. relays such as a doubler of said very low voltage.
  • the current-voltage converter comprises a primary winding and a secondary winding, mounted concentrically around the same core constituting an open magnetic circuit, advantageously made of a ferro-magnetic material such as mild steel.
  • the control device comprises at least two relays for printed circuits, the coils of which are mounted in parallel and the contacts of which are mounted in series in the corresponding power circuit, these relays can be mass distribution relays relay type for automobiles.
  • the control device comprises a base plate carrying a main printed circuit, and, for each relay a printed circuit support plate, mounted perpendicular to the base plate, the conductors power and low voltage current being made in the form of printed circuits, the power conductors of the support plates and the base plate being advantageously connected by soldered conductors.
  • control device comprises, for a three-phase power system, a pair of relays associated with each phase and the three pairs of relays are arranged one beside the other, the three corresponding relays of said pairs being fixed on two separate support plates, extending perpendicular to said base plate.
  • the control device which is shown by way of example essentially comprises a basic board 1 with a printed circuit, on which are mounted perpendicularly two support boards 2 and 3 on which the relays 4a, 4b and 4c are respectively welded. 'on the one hand, and 5a, 5b and 5c, on the other.
  • each relay has a control coil 6 and a contact 7 whose closing and opening are controlled by the coil 6.
  • the latter is supplied with electric current from an electronic device, shown in Figure 4, which provides a current at very low voltage.
  • the coils 6 of the relays 4a and 5a are mounted in parallel, as well as the coils of relays 4b and 5b and relays 4c and 5c.
  • the contacts 7 of the two relays whose coils 6 are mounted in parallel are arranged in series in the same power circuit.
  • the external input and output connection terminals for the power circuit of each pair of relays are indicated by the references 9 and 10 respectively.
  • Each of the three pairs of relays 4a, 5a; 4b, 5b; 4c, 5c can be associated with a phase of a three-phase power supply system.
  • each support plate 2 or 3 carries three relays which are juxtaposed. These plates 2 and 3 are shaped in the same way and are mounted in such a way on the plate 1 that the relays forming a pair are located opposite one another.
  • the electrical conductors for supplying very low voltage current to the coils and at low voltage to the power circuits are produced in the form of printed circuits (not shown) on the boards 1, 2 and 3. It can be seen that the printed circuits conducting power circuits of the support plates 2 and 3 are connected to corresponding printed circuit conductors of the base plate 1 by conductive links 11 and 12. In the power printed circuit associated with each pair of relays is mounted a device for load detection 14 electrically connected to the circuit of wafer 1.
  • An insulating housing 18 is provided to protect the entire device against direct contact with the live parts, while providing holes 19 and 20 for the passage of the terminals. connection 9 and 10, and housings 21, 22 around these lugs to allow the electrical connection of the connectors (not shown) of the power circuits upstream and downstream of the control device according to the invention.
  • connection 9 and 10 and housings 21, 22 around these lugs to allow the electrical connection of the connectors (not shown) of the power circuits upstream and downstream of the control device according to the invention.
  • Figure 1 we also see the presence of slots allowing natural ventilation of the relay.
  • relay coils 6 are electrically connected at 27, 28 and 29 to the electronic excitation circuit shown in FIG. 4. These circuits are located on the base plate 1.
  • the means load control electronics ( Figure 7) associated with the device 14 ( Figure 6) are equipped with a rheostat 33 located inside the housing 18 and whose adjusting screw 35 is accessible from outside the housing.
  • FIG. 4 represents the electronic excitation circuit of the coils 6 of the relays 4a, b, c and 5a, b, c. It is made up of a system allowing from a single very low voltage supply to supply two DC voltages of different value V1, V3. The highest voltage V3 is used only to cause the closure of the contacts 7 by exciting the coils 6 for a predetermined time, the lowest voltage V1 serving to maintain the contacts 7 in the closed position.
  • the circuit comprises a transformer T whose secondary winding is connected to the circuit generating the DC voltage V1 essentially comprising a rectifier bridge PR with diodes D1 to 4 and a capacitor C1 intended to be charged at said voltage V1.
  • the secondary winding circuit of the transformer T further comprises a voltage doubler arrangement essentially comprising a series connection of a capacitor C2, a diode D5 and a capacitor C3, a diode D6 being connected between a point common to the capacitor C2 and to the diode D5 and at a common point between the capacitor C3 and the corresponding terminal of the secondary winding of the transformer T.
  • the two diodes D5 and D6 are reverse biased, that is to say the anode of the diode D5 is connected to the cathode of diode D6.
  • the cathode of the rectifying diode D5 is connected to the emitter of a transistor Q1 of the PNP type, the basic circuit of which comprises a switching element such as a transistor Q2 of the NPN type.
  • the relays are mounted in the collector circuit of transistor Q1.
  • Figure 4 shows the connection terminals 27, 28 and 29 as defined in Figure 3. Terminals 29 and 28 are in a first collector circuit while terminals 29 and 27 are part of a second circuit collector parallel to the first.
  • Each of the two parallel circuits comprises an assembly of the Darlington type formed respectively by transistors Q3, Q4 and Q5, Q6, of the NPN type.
  • the transistor Q2 and the two Darlington circuits can be controlled by applying an appropriate control voltage to the input terminals B1 and B2, B3.
  • Terminal B1 is connected by a series connection of a resistor R1 and a capacitor C5 to the base of transistor Q2, while terminals B2 and B3 are connected respectively to the bases of transistors Q3 and Q5 via d '' appropriate resistance.
  • the capacitor C1 is connected by an electrode, via a diode D7 to the collector of the transistor Q1, while the other electrode is connected to the emitters of transistors Q2, Q4 and Q6.
  • the electronic excitation circuit comprises means making it possible to synchronize the control of the transistor Q2 with the secondary voltage of the transformer T by means of an opto-coupler whose photodiode OC1 is mounted in parallel on the secondary winding of the transformer T and whose phototransistor OC2 is in parallel with the capacitor C1 through an appropriate resistor.
  • the emitter of transistor OC2 is connected to the clock input CK of a flip-flop BA1, the output of which is connected to the control terminal B1 of transistor Q2.
  • the data input D of the flip-flop BA1 is connected to the output of a flip-flop BA4 whose data inputs D and clock CK are linked together by a normally open push-button IT2.
  • the priority reset inputs R of flip-flops BA1 and BA4 are connected to each other and to the common point of a circuit RC consisting of a resistor R10 and a capacitor C11. This common point B4 is connected to point B4 in FIG. 8.
  • the free electrode of R10 is connected to ground and that of C11 is connected to the input D of the flip-flop BA4, as well as to the positive electrode of the capacitor C1.
  • FIG. 6 represents the current-voltage converter 14.
  • This comprises a cylindrical ferro-magnetic core 40, advantageously made of mild steel, around which is concentrically mounted a magnetic coil 41 connected to the electronic charge control circuit shown in FIG. 7 by its input and output terminals 42 and 43 serving as a stud solderable for connection to the main printed circuit 1.
  • These studs 42 and 43 are force fitted into the frame 44 of the converter, the part 45 of which forms a housing around the coil 41 and isolates it from the primary winding 46 of the converter concentrically the primary coil 41, outside the housing.
  • the winding 46 is mounted in the power circuit of the device as shown in Figure 3 and consists of at least one turn of electrical conductor.
  • the coil 41 is held integral with the assembly by the addition of filling resin inside the housing 45.
  • FIG. 7 shows the diagram of a charge control circuit and more precisely for detecting an overload, for a control system adapted to a three-phase network.
  • each secondary winding 41 is connected to an amplifier A1 or A2.
  • Diodes D8 and D9 connect the outputs of the amplifiers A1 and A2 respectively to a single RC type circuit comprising, connected in parallel, a capacitor C7 and a resistor R3.
  • the point common to the diode D9 and to the RC circuit is connected to an amplifier A3 whose output is connected to a delay circuit comprising a resistor R4 and a capacitor C8 connected to a reference voltage of for example 0.6V by one of its limits.
  • the free terminal of this capacitor is connected to one of the inputs of a comparator A4, the other input of this being connected to the cursor of a potentiometer 33 mounted in a circuit appropriate to allow the establishment of a reference voltage.
  • the output of this comparator A4 bears the reference B5.
  • FIG. 8 shows an exemplary embodiment of a relay opening control circuit used in a three-phase system, making it possible to cut the current in the power circuits in the vicinity of the zero value thereof.
  • Its first input terminal is terminal B5 of the electronic charge control circuit according to FIG. 7.
  • This terminal B5 is connected to one of the two inputs of a PO gate of the NON type and whose output B4 is connected to the terminal B4 of FIG. 4.
  • the second input terminal of the control circuit is the terminal B1 of the electronic excitation circuit according to FIG. 4.
  • the input terminal B1 is connected to the priority reset inputs R of the flip-flops BA2 and BA3 as well as to a delay circuit constituted by R7 and C10 through a diode D12.
  • This common point constituted by the cathode of D12 and an electrode of R7 and C10 is connected to the input of an inverter IN3, the output of which is connected to the priority 1 reset inputs S of flip-flops BA2 and BA3.
  • the data input D of the flip-flop BA2 is brought to a logic level 1 represented by + V.
  • the complemented output M of the flip-flop BA2 is connected via a diode D10 to a delay circuit formed by a resistor R5 and a capacitor C8 connected in parallel and connected to ground.
  • the free input of the RC assembly is connected via an inverter IN1 to the data input of a flip-flop BA3.
  • the complemented output K of the flip-flop BA3 is connected by a diode D11 to a parallel mounting of the RC type comprising a resistor R6 and a capacitor C9 connected to ground, and to a tracking amplifier A5.
  • the output thereof is connected to the control terminal B3 of the electronic excitation circuit according to FIG. 4.
  • the opening control circuit represented in FIG. 8 comprises a second output terminal B2 which is connected to the terminal B2 control circuit. This output is connected to the output of an inverter IN2 whose input is connected to the output of the inverter IN1.
  • the second input the PO gate is connected to earth by an appropriate resistance.
  • a normally closed push-button IT1 connects the 2 inputs of the PO door.
  • the electronic excitation circuit represented in FIG. 4 has the function of producing a pulse current C as a function of the time t indicated in milliseconds in FIG. 5.
  • This current has a first period of high intensity allowing the closure of the contacts 7 of the relay, followed by a current of a lower value intended to ensure that these contacts are kept closed 7.
  • the current excitation and closing of the relays is produced using the voltage doubler contained in the circuit according to Figure 4. Indeed, the assembly shown, formed by the capacitors C2 and C3 and the rectifier diodes D5 and D6 as well that the secondary of the transformer T makes it possible to obtain at the terminals of the capacitor C3 a voltage V3 twice the voltage V1 present at the terminals of the capacitor C1. Indeed, the voltage V3 across the capacitor C3 is equal to the sum of the voltages across the capacitor C2 and across the secondary winding of the transformer T.
  • the capacitor C1 charges at the voltage V1 through the rectifier bridge PR .
  • the coils 6 of the relays are crossed by the current of lower value supplied by the capacitor C1, through the diode D7.
  • the application of the closing control voltage applied to the control input B1 is synchronized with the network voltage thanks to the optocoupler circuit OC1, OC2 and the flip-flop BA1, so that the capacitor Q2 becomes conductor from the start of the conduction half-period of the diodes D3 and D2.
  • the function of the flip-flop BA4 is to avoid the flapping (open-closed) of the relays when there is an overload fault simultaneously and to keep IT2 in the closed position.
  • the control voltages which are applied to the inputs B2 and B3 are generated by the circuit shown in FIG. 8, also synchronously with the network voltage, as will be described later.
  • the circuit constituted by R10 and C10 has the role of preventing the inadvertent closing of the relays when the various circuits are energized.
  • the charge control or overload detection circuit is connected to the secondary windings 41 of two converters 14 which are placed on two distinct phases of the network.
  • a voltage V5 is produced produced from the highest voltage of those generated by the windings 41.
  • This voltage V5 is applied to the input of the amplifier A3 which is mounted so as to present a gain for example of 7.07.
  • the output voltage V6 of this amplifier A3 is thus equal to 10 times the effective value of the highest value input signal produced by the windings 41.
  • the circuit formed by the resistor R4 and the capacitor C8 delays the evolution of the voltage V6 at the input of the comparator A4. This allows the presence of transient overloads in the power circuits.
  • the comparator A4 produces at its output B5 a signal of zero value, indicating an overload.
  • the circuit shown in Figure 8 controls the opening of the three-phase relays with power cut in the power circuits near the zero value.
  • the overload detection circuit according to FIG. 7 produces a zero signal at its output B5, or when the push button IT1 is operated, the output of the gate NO and bearing the reference PO goes to state 1 which is applied to the priority reset input R of the flip-flop BA1 in figure 4.
  • the output of BA1 goes to state 0 and the voltage across terminals B1 of figures 4 and 8 is canceled which has the effect of unlocking the priority reset inputs R of flip-flops BA2 and BA3 and carrying the complemented output M of the flip-flop BA2 to a level 0 as soon as a synchronization signal taken from one of the two converters 14 appears on its input CK.
  • the data input D of the flip-flop BA3 changes to state 1 which produces at the complemented output K of the flip-flop the state zero during a change of state towards a state 1 of the synchronization signal at the input CK obtained by the second converter shown in FIG. 7 and associated with a second phase of the three-phase network.
  • the output signal at the terminal B3 becomes zero, which causes the blocking of the second Darlington circuit formed by the transistors Q5 and Q6.
  • the relays mounted between terminals 29 and 27 are no longer supplied with current and their contact 7 opens. This opening occurs at a time when the current passing through the contacts is decreasing and close to the zero value.
  • the values of components R6 and C9 are calculated according to the frequency of the network and the mechanical characteristics of the relays used.
  • the application of a signal to the reset inputs S to one of the flip-flops is effective only in the absence of a synchronization signal at the CK inputs of the relays.
  • the contacts 7 of the relays are closed when an appropriate voltage is applied to the inputs R for zeroing flip-flops BA2 and BA3, which will be transmitted to terminals B2 and B3.
  • the relays used can be very widespread relays of the relay type for cars. Since the excitation current of the relays only flows for a relatively short time interval necessary for the closing of the relays and is then reduced to the lowest value for maintaining the contacts in the closed state, the control device can operate for a given power with less heating, a reduced volume and therefore a lower cost price, compared to the known device. Since the relay excitation circuit operates from a single voltage source which can very favorably be very low voltage, these relays can be used in all circuits comprising both very low voltage such as electronic logic circuits and power circuits.
  • the opening of the relay contacts is synchronized with respect to the network voltage so that the different contacts separate when the value of the current flowing through it is close to zero makes it possible to increase the longevity of the relays by eliminating the wear of the contacts by the effect of the electric arc and reduce the electromagnetic interference generated during the separation of the contacts.
  • connection lugs for the power circuit (s) it is also advantageous for the assembly formed by the relays and the support plates to be enclosed in an insulating box comprising orifices for the passage of the connection lugs for the power circuit (s), so that these connection lugs make protrusion out of the housing, on its face opposite to that of the main circuit, and slots allowing natural ventilation of the relays. It is also advantageous for the function linking the primary current and the secondary voltage of the converter to be linear. In addition, the structure of the device according to the invention ensures good electrical insulation between the primary and secondary circuits.

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  • Power Engineering (AREA)
  • Relay Circuits (AREA)

Abstract

The invention relates to a device for the switching on and off of electrical power circuits under low, single-phase or multi-phase voltage. The device comprises at least one relay (4a-c; 5a-c) provided with a control coil (6) supplied with direct current at low voltage, and at least one working contact (7) incorporated in the power circuit associated with each phase, and is characterised in that it comprises an electronic circuit for exciting a relay (4a, b, c, 5a, b, c) adapted to furnish the coil (6) of the relay, during the excitation period, with a pulsed current having the necessary value for the excitation, and then a current with lower value reduced to the necessary value for sustaining the relay and the electromagnetic means for detecting overloads. The invention can be used for printed circuits. <IMAGE>

Description

La présente invention concerne un dispositif pour l'ouverture et la fermeture de circuits de puissance électrique en basse tension, monophasée ou polyphasée, comprenant au moins un relais pourvu d'une bobine de commande alimentée en courant continu sous basse tension et au moins un contact de travail incorporé au circuit de puissance associé à chaque phase.The present invention relates to a device for opening and closing low-voltage electric power circuits, single-phase or multi-phase, comprising at least one relay provided with a control coil supplied with direct current at low voltage and at least one contact. of work incorporated in the power circuit associated with each phase.

Dans des dispositifs connus de ce type, les contacts utilisés nécessitent pour couper le courant des circuits principaux dits "de puissance'' une distance d'ouverture importante entre des contacts, ce qui conduit à surdimensionner les bobines d'actionnement des contacts. De plus, leurs dimensions importantes font qu'ils sont mal adaptés à la commande de circuits réalisés en circuits imprimés, et, enfin, leur prix est élevé.In known devices of this type, the contacts used require to cut the current of the so-called "power" main circuits a large opening distance between contacts, which leads to oversizing the contact actuation coils. , their large dimensions make them unsuitable for ordering circuits made in printed circuits, and, finally, their price is high.

La présente invention a pour but de pallier à ces inconvénients.The present invention aims to overcome these drawbacks.

Pour atteindre ce but, le dispositif de commande selon l'invention comprend un circuit électronique d'excitation d'un relais, adapté pour fournir à la bobine du relais pendant la durée d'excitation un courant impulsionnel présentant la valeur nécessaire pour l'excitation et ensuite un courant de plus faible valeur réduite à la valeur nécessaire pour le maintien du relais, et des moyens électromagnétiques de détection de surcharge.To achieve this goal, the control device according to the invention comprises an electronic circuit for excitation of a relay, adapted to supply the coil of the relay during the excitation period with a pulse current having the value necessary for the excitation. and then a current of lower value reduced to the value necessary for maintaining the relay, and electromagnetic overload detection means.

Selon une autre caractéristique, le dispositif de commande comporte un circuit de commande d'ouverture des contacts à une valeur du courant les traversant, qui est voisine de zéro, avantageusement en cas d'une surcharge.According to another characteristic, the device for control comprises a circuit for controlling the opening of the contacts at a value of the current passing through them, which is close to zero, advantageously in the event of an overload.

Selon une caractéristique avantageuse de l'invention, le convertisseur courant-tension comprend un enroulement primaire monté en série avec le circuit de puissance à contrôler et un enroulement secondaire relié électriquement à un circuit détecteur de surcharge.According to an advantageous characteristic of the invention, the current-voltage converter comprises a primary winding connected in series with the power circuit to be controlled and a secondary winding electrically connected to an overload detector circuit.

Selon une caractéristique avantageuse de l'invention, le circuit électronique d'excitation comprend une source de très basse tension, des moyens de production dudit courant de maintien des relais à partir de cette tension et des moyens de production du courant plus elevé d'excitation des relais tels qu'un doubleur de ladite très basse tension.According to an advantageous characteristic of the invention, the electronic excitation circuit comprises a very low voltage source, means for producing said relay holding current from this voltage and means for producing the higher excitation current. relays such as a doubler of said very low voltage.

Selon encore une autre caractéristique avantageuse, le convertisseur courant-tension comprend un enroulement primaire et un enroulement secondaire, montés concentriquement autour d'un même noyau constituant un circuit magnétique ouvert, avantageusement en un matériau ferro-magnétique tel que de l'acier doux.According to yet another advantageous characteristic, the current-voltage converter comprises a primary winding and a secondary winding, mounted concentrically around the same core constituting an open magnetic circuit, advantageously made of a ferro-magnetic material such as mild steel.

Selon une autre caractéristique avantageuse, le dispositif de commande comprend au moins deux relais pour circuits imprimés, dont les bobines sont montées en parallèle et dont les contacts sont montés en série dans le circuit de puissance correspondant, ces relais pouvant être des relais de grande diffusion du type relais pour automobiles.According to another advantageous characteristic, the control device comprises at least two relays for printed circuits, the coils of which are mounted in parallel and the contacts of which are mounted in series in the corresponding power circuit, these relays can be mass distribution relays relay type for automobiles.

Selon une autre caractéristique avantageuse de l'invention, le dispositif de commande comprend une plaquette de base porteuse d'un circuit imprimé principal, et, pour chaque relais une plaquette de support à circuit imprimé, monté perpendiculairement à la plaquette de base, les conducteurs de puissance et du courant à basse tension étant réalisés sous forme de circuits imprimés, les conducteurs de puissance des plaquettes de support et de la plaquette de base étant avantageusement reliés par des conducteurs soudés.According to another advantageous characteristic of the invention, the control device comprises a base plate carrying a main printed circuit, and, for each relay a printed circuit support plate, mounted perpendicular to the base plate, the conductors power and low voltage current being made in the form of printed circuits, the power conductors of the support plates and the base plate being advantageously connected by soldered conductors.

Selon encore une autre caractéristique avantageuse de l'invention, le dispositif de commande comprend, pour un système de puissance triphasé, une paire de relais associée à chaque phase et les trois paires de relais sont disposées l'une à côté des autres, les trois relais correspondants desdites paires étant fixés sur deux plaquettes de support distinctes, s'étendant perpendiculairement à ladite plaquette de base.According to yet another advantageous characteristic of the invention, the control device comprises, for a three-phase power system, a pair of relays associated with each phase and the three pairs of relays are arranged one beside the other, the three corresponding relays of said pairs being fixed on two separate support plates, extending perpendicular to said base plate.

L'invention sera mieux comprise et d'autres buts, caractéristiques, détails et avantages de celle-ci apparaîtront plus clairement au cours de la description explicative qui va suivre faite en référence aux dessins schématiques annexés donnés uniquement à titre d'exemple illustrant un mode de réalisation de l'invention et dans lesquels :

  • La figure 1 est une vue en coupe d'un dispositif de commande selon l'invention, le long de la ligne I-I de la figure 2 ;
  • La figure 2 est une vue en coupe du dispositif de commande selon l'invention, le long de la ligne II-II de la figure 1 ;
  • La figure 3 montre de façon schématique le montage électrique des bobines et contacts des relais utilisés dans le dispositif de commande selon la prèsente invention ;
  • La figure 4 montre le schéma d'un circuit électronique d'excitation d'un relais, selon la présente invention ;
  • La figure 5 illustre l'allure du courant électrique fourni par le circuit de la figure 4 ;
  • La figure 6 est une vue en coupe, schématique d'un convertisseur courant-tension selon la présente invention ;
  • La figure 7 représente le schéma d'un circuit de détection de surcharge selon la présente invention ; et
  • La figure 8 montre le schéma d'un circuit de commande d'ouverture de relais selon la présente invention.
The invention will be better understood and other objects, characteristics, details and advantages thereof will appear more clearly during the explanatory description which follows, made with reference to the appended schematic drawings given solely by way of example illustrating a mode of the invention and in which:
  • Figure 1 is a sectional view of a control device according to the invention, along line II of Figure 2;
  • Figure 2 is a sectional view of the control device according to the invention, along the line II-II of Figure 1;
  • FIG. 3 schematically shows the electrical mounting of the coils and contacts of the relays used in the control device according to the present invention;
  • FIG. 4 shows the diagram of an electronic excitation circuit of a relay, according to the present invention;
  • Figure 5 illustrates the shape of the electric current supplied by the circuit of Figure 4;
  • Figure 6 is a schematic sectional view of a current-voltage converter according to the present invention;
  • FIG. 7 represents the diagram of an overload detection circuit according to the present invention; and
  • Figure 8 shows the diagram of a relay opening control circuit according to the present invention.

Le dispositif de commande qui est représenté à titre d'exemple, comprend essentiellement une plaquette de base 1 à circuit imprimé, sur laquelle sont montées perpendiculairement deux plaquettes de support 2 et 3 sur lesquelles sont soudés respectivement les relais 4a, 4b et 4c, d'une part, et 5a, 5b et 5c, d'autre part. Comme le montre schématiquement la figure 3, chaque relais comporte une bobine de commande 6 et un contact 7 dont la fermeture et l'ouverture sont commandées par la bobine 6. Cette dernière est alimentée en courant électrique à partir d'un dispositif électronique, représenté à la figure 4, qui lui fournit un courant sous très basse tension. Les bobines 6 des relais 4a et 5a sont montées en parallèle, ainsi que les bobines des relais 4b et 5b et les relais 4c et 5c. Les contacts 7 des deux relais dont les bobines 6 sont montées en parallèle sont disposées en série dans un même circuit de puissance. Les bornes de raccordement externes d'entrée et de sortie pour le circuit de puissance de chaque paire de relais sont indiquées par les références respectivement 9 et 10. Chacune des trois paires de relais 4a, 5a ; 4b, 5b ; 4c, 5c peut être associée à une phase d'un système d'alimentation en puissance triphasée.The control device which is shown by way of example essentially comprises a basic board 1 with a printed circuit, on which are mounted perpendicularly two support boards 2 and 3 on which the relays 4a, 4b and 4c are respectively welded. 'on the one hand, and 5a, 5b and 5c, on the other. As shown schematically in Figure 3, each relay has a control coil 6 and a contact 7 whose closing and opening are controlled by the coil 6. The latter is supplied with electric current from an electronic device, shown in Figure 4, which provides a current at very low voltage. The coils 6 of the relays 4a and 5a are mounted in parallel, as well as the coils of relays 4b and 5b and relays 4c and 5c. The contacts 7 of the two relays whose coils 6 are mounted in parallel are arranged in series in the same power circuit. The external input and output connection terminals for the power circuit of each pair of relays are indicated by the references 9 and 10 respectively. Each of the three pairs of relays 4a, 5a; 4b, 5b; 4c, 5c can be associated with a phase of a three-phase power supply system.

Comme il ressort clairement des figures, chaque plaquette de support 2 ou 3 porte trois relais qui sont juxtaposés. Ces plaquettes 2 et 3 sont conformées de la même manière et sont montées de telle manière sur la plaquette 1 que les relais formant une paire se trouve en regard l'un de l'autre.As is clear from the figures, each support plate 2 or 3 carries three relays which are juxtaposed. These plates 2 and 3 are shaped in the same way and are mounted in such a way on the plate 1 that the relays forming a pair are located opposite one another.

Les conducteurs électriques d'alimentation en courant de très basse tension des bobines et en basse tension des circuits de puissance sont réalisés sous forme de circuits imprimés (non représentés) sur les plaquettes 1, 2 et 3. On constate que les circuits imprimés conducteurs des circuits de puissance des plaquettes de support 2 et 3 sont reliés à des conducteurs de circuits imprimés correspondant de la plaquette de base 1 par des liaisons conductrices 11 et 12. Dans le circuit imprimé de puissance associé à chaque paire de relais est monté un dispositif de détection de charge 14 relié èlectriquement au circuit de la plaquette 1.The electrical conductors for supplying very low voltage current to the coils and at low voltage to the power circuits are produced in the form of printed circuits (not shown) on the boards 1, 2 and 3. It can be seen that the printed circuits conducting power circuits of the support plates 2 and 3 are connected to corresponding printed circuit conductors of the base plate 1 by conductive links 11 and 12. In the power printed circuit associated with each pair of relays is mounted a device for load detection 14 electrically connected to the circuit of wafer 1.

Un boîtier isolant 18 est prévu pour protéger l'ensemble du dispositif contre des contacts directs avec les parties sous tension, tout en ménageant des orifices 19 et 20 pour le passage des cosses de raccordement 9 et 10, et des logements 21, 22 autour de ces cosses pour permettre le raccordement électrique des connecteurs (non représentés) des circuits de puissance en amont et en aval du dispositif de commande selon l'invention. Sur la figure 1 on constate aussi la présence de fentes permettant une ventilation naturelle du relais.An insulating housing 18 is provided to protect the entire device against direct contact with the live parts, while providing holes 19 and 20 for the passage of the terminals. connection 9 and 10, and housings 21, 22 around these lugs to allow the electrical connection of the connectors (not shown) of the power circuits upstream and downstream of the control device according to the invention. In Figure 1 we also see the presence of slots allowing natural ventilation of the relay.

En se référant à la figure 3, on constate que les bobines de relais 6 sont raccordées électriquement en 27, 28 et 29 au circuit électronique d'exciation représenté à la figure 4. Ces circuits sont situés sur la plaquette de base 1. Les moyens électroniques de contrôle de charge (figure 7) associés au dispositif 14 (figure 6) sont équipés d'un rhéostat 33 situé à l'intérieur du boitier 18 et dont la vis de réglage 35 est accessible de l'extérieur du boîtier.Referring to FIG. 3, it can be seen that the relay coils 6 are electrically connected at 27, 28 and 29 to the electronic excitation circuit shown in FIG. 4. These circuits are located on the base plate 1. The means load control electronics (Figure 7) associated with the device 14 (Figure 6) are equipped with a rheostat 33 located inside the housing 18 and whose adjusting screw 35 is accessible from outside the housing.

La figure 4 représente le circuit électronique d'excitation des bobines 6 des relais 4a, b, c et 5a, b, c. Il est constitué par un système permettant à partir d'une alimentation unique en très basse tension de fournir deux tensions continues de valeur différentes V1, V3. La tension la plus élevée V3 est utilisée uniquement pour provoquer la fermeture des contacts 7 par l'excitation des bobines 6 pendant un temps prédéterminé, la tension la plus basse V1 servant au maintien des contacts 7 en position fermée.FIG. 4 represents the electronic excitation circuit of the coils 6 of the relays 4a, b, c and 5a, b, c. It is made up of a system allowing from a single very low voltage supply to supply two DC voltages of different value V1, V3. The highest voltage V3 is used only to cause the closure of the contacts 7 by exciting the coils 6 for a predetermined time, the lowest voltage V1 serving to maintain the contacts 7 in the closed position.

A cette fin, le circuit comprend un transformateur T dont l'enroulement secondaire est relié au circuit générateur de la tension continue V1 comprenant essentiellement un pont redresseur PR à diodes D1 à 4 et un condensateur C1 destiné à être chargé à ladite tension V1. Le circuit de l'enroulement secondaire du transformateur T comprend en outre un agencement doubleur de tension comprenant essentiellement un montage en série d'un condensateur C2, d'une diode D5 et d'un condensateur C3, une diode D6 étant connectée entre un point commun au condensateur C2 et à la diode D5 et à un point commun entre le condensateur C3 et la borne correspondante de l'enroulement secondaire du transformateur T. Les deux diodes D5 et D6 sont polarisées de façon inverse, c'est-à-dire l'anode de la diode D5 est reliée à la cathode de la diode D6.To this end, the circuit comprises a transformer T whose secondary winding is connected to the circuit generating the DC voltage V1 essentially comprising a rectifier bridge PR with diodes D1 to 4 and a capacitor C1 intended to be charged at said voltage V1. The secondary winding circuit of the transformer T further comprises a voltage doubler arrangement essentially comprising a series connection of a capacitor C2, a diode D5 and a capacitor C3, a diode D6 being connected between a point common to the capacitor C2 and to the diode D5 and at a common point between the capacitor C3 and the corresponding terminal of the secondary winding of the transformer T. The two diodes D5 and D6 are reverse biased, that is to say the anode of the diode D5 is connected to the cathode of diode D6.

La cathode de la diode de redressement D5 est reliée à l'èmetteur d'un transistor Q1 du type PNP dont le circuit de base comporte un élément commutateur tel qu'un transistor Q2 du type NPN. Les relais sont montés dans le circuit collecteur du transistor Q1. La figure 4 indique les bornes de connexion 27, 28 et 29 telles qu'elles sont définies à la figure 3. Les bornes 29 et 28 se trouvent dans un premier circuit collecteur tandis que les bornes 29 et 27 font partie d'un deuxième circuit collecteur parallèle au premier. Chacun des deux circuits parallèles comporte un montage du type Darlington formé respectivement par des transistors Q3, Q4 et Q5, Q6, du type NPN. Le transistor Q2 et les deux montages Darlington peuvent être commandés par application d'une tension de commande appropriée aux bornes d'entrée B1 et B2, B3. La borne B1 est reliée par un montage en série d'une résistance R1 et d'un condensateur C5 à la base du transistor Q2, tandis que les bornes B2 et B3 sont connectées respectivement aux bases des transistors Q3 et Q5 par l'intermédiaire d'une résistance appropriée. On constate que le condensateur C1 est relié par une électrode, par l'intermédiaire d'une diode D7 au collecteur du transistor Q1, tandis que l'autre électrode est reliée aux émetteurs de transistors Q2, Q4 et Q6.The cathode of the rectifying diode D5 is connected to the emitter of a transistor Q1 of the PNP type, the basic circuit of which comprises a switching element such as a transistor Q2 of the NPN type. The relays are mounted in the collector circuit of transistor Q1. Figure 4 shows the connection terminals 27, 28 and 29 as defined in Figure 3. Terminals 29 and 28 are in a first collector circuit while terminals 29 and 27 are part of a second circuit collector parallel to the first. Each of the two parallel circuits comprises an assembly of the Darlington type formed respectively by transistors Q3, Q4 and Q5, Q6, of the NPN type. The transistor Q2 and the two Darlington circuits can be controlled by applying an appropriate control voltage to the input terminals B1 and B2, B3. Terminal B1 is connected by a series connection of a resistor R1 and a capacitor C5 to the base of transistor Q2, while terminals B2 and B3 are connected respectively to the bases of transistors Q3 and Q5 via d '' appropriate resistance. It can be seen that the capacitor C1 is connected by an electrode, via a diode D7 to the collector of the transistor Q1, while the other electrode is connected to the emitters of transistors Q2, Q4 and Q6.

Le circuit électronique d'excitation comprend des moyens permettant de synchroniser la commande du transistor Q2 avec la tension secondaire du transformateur T grâce à un opto-coupleur dont la photodiode OC1 est montée en parallèle sur l'enroulement secondaire du transformateur T et dont le phototransistor OC2 est en parallèle au condensateur C1 au travers d'une résistance appropriée. L'èmetteur du transistor OC2 est relié à l'entrée d'horloge CK d'une bascule BA1 dont la sortie est reliée à la borne de commande B1 du transistor Q2.The electronic excitation circuit comprises means making it possible to synchronize the control of the transistor Q2 with the secondary voltage of the transformer T by means of an opto-coupler whose photodiode OC1 is mounted in parallel on the secondary winding of the transformer T and whose phototransistor OC2 is in parallel with the capacitor C1 through an appropriate resistor. The emitter of transistor OC2 is connected to the clock input CK of a flip-flop BA1, the output of which is connected to the control terminal B1 of transistor Q2.

L'entrée de données D de la bascule BA1 est reliée à la sortie d'une bascule BA4 dont les entrées de données D et d'horloge CK sont reliées entre elles par un bouton-poussoir normalement ouvert IT2. Les entrées de remise à zéro prioritaires R des bascules BA1 et BA4 sont reliées entre elles et au point commun d'un circuit RC constitué par une résistance R10 et un condensateur C11. Ce point commun B4 se raccorde au point B4 de la figure 8. L'èlectrode libre de R10 est raccordée à la masse et celle de C11 est reliée à l'entrée D de la bascule BA4, ainsi qu'à l'électrode positive du condensateur C1.The data input D of the flip-flop BA1 is connected to the output of a flip-flop BA4 whose data inputs D and clock CK are linked together by a normally open push-button IT2. The priority reset inputs R of flip-flops BA1 and BA4 are connected to each other and to the common point of a circuit RC consisting of a resistor R10 and a capacitor C11. This common point B4 is connected to point B4 in FIG. 8. The free electrode of R10 is connected to ground and that of C11 is connected to the input D of the flip-flop BA4, as well as to the positive electrode of the capacitor C1.

La figure 6 représente le convertisseur courant-tension 14. Celui-ci comprend un noyau ferro-magnétique cylindrique 40, avantageusement en acier doux, autour duquel est montée concentriquement une bobine magnétique 41 reliée au circuit électronique de contrôle de charge représentée à la figure 7 par ses bornes d'entrée et de sortie 42 et 43 servant de plot soudable de raccordement au circuit imprimé principal 1. Ces plots 42 et 43 sont emmanchés à force dans le bâti 44 du convertisseur dont la partie 45 forme un boîtier autour de la bobine 41 et l'isole de l'enroulement primaire 46 du convertisseur entourant concentriquement la bobine primaire 41, à l'extérieur du boîtier. L'enroulement 46 est monté dans le circuit de puissance du dispositif comme indiqué figure 3 et est constitué par au moins une spire de conducteur électrique. la bobine 41 est maintenue solidaire de l'ensemble par l'addition de résine de remplissage de l'intérieur du boitier 45.FIG. 6 represents the current-voltage converter 14. This comprises a cylindrical ferro-magnetic core 40, advantageously made of mild steel, around which is concentrically mounted a magnetic coil 41 connected to the electronic charge control circuit shown in FIG. 7 by its input and output terminals 42 and 43 serving as a stud solderable for connection to the main printed circuit 1. These studs 42 and 43 are force fitted into the frame 44 of the converter, the part 45 of which forms a housing around the coil 41 and isolates it from the primary winding 46 of the converter concentrically the primary coil 41, outside the housing. The winding 46 is mounted in the power circuit of the device as shown in Figure 3 and consists of at least one turn of electrical conductor. the coil 41 is held integral with the assembly by the addition of filling resin inside the housing 45.

La figure 7 montre le schéma d'un circuit de contrôle de charge et plus précisément de détection d'une surcharge, pour un système de commande adapté à un rèseau triphasé.FIG. 7 shows the diagram of a charge control circuit and more precisely for detecting an overload, for a control system adapted to a three-phase network.

Comme le montre la figure 7, on utilise à cette fin les signaux produits par au moins deux enroulements secondaires 41, chacun associé à une phase du réseau, d'un convertisseur 14 selon la figure 6. Chaque enroulement secondaire 41 est relié à un amplificateur A1 ou A2. Des diodes D8 et D9 relient les sorties des amplificateurs respectivement A1 et A2 à un montage unique du type RC comprenant, montés en parallèle, un condensateur C7 et une résistance R3. Le point commun à la diode D9 et au circuit RC est relié à un amplificateur A3 dont la sortie est reliée à un circuit à retard comprenant une résistance R4 et un condensateur C8 relié à une tension de référence de par exemple 0,6V par une de ses bornes. La borne libre de ce condensateur est connectée à l'une des entrées d'un comparateur A4, l'autre entrée de celui-ci étant reliée au curseur d'un potentiomètre 33 monté dans un circuit approprié de façon à permettre l'établissement d'une tension de référence. La sortie de ce comparateur A4 porte la référence B5.As shown in FIG. 7, the signals produced by at least two secondary windings 41, each associated with a phase of the network, of a converter 14 according to FIG. 6 are used for this purpose. Each secondary winding 41 is connected to an amplifier A1 or A2. Diodes D8 and D9 connect the outputs of the amplifiers A1 and A2 respectively to a single RC type circuit comprising, connected in parallel, a capacitor C7 and a resistor R3. The point common to the diode D9 and to the RC circuit is connected to an amplifier A3 whose output is connected to a delay circuit comprising a resistor R4 and a capacitor C8 connected to a reference voltage of for example 0.6V by one of its limits. The free terminal of this capacitor is connected to one of the inputs of a comparator A4, the other input of this being connected to the cursor of a potentiometer 33 mounted in a circuit appropriate to allow the establishment of a reference voltage. The output of this comparator A4 bears the reference B5.

On constate que seulement les éléments de circuit qui sont déterminants pour le fonctionnement de celui-ci ont été mentionnés, tandis que les autres éléments sont considérés comme étant classiques pour le montage des amplificateurs.It can be seen that only the circuit elements which are decisive for the operation thereof have been mentioned, while the other elements are considered to be conventional for mounting the amplifiers.

La figure 8 montre un exemple de réalisation d'un circuit de commande d'ouverture de relais utilisé dans un sytème triphasé, permettant de couper le courant dans les circuits de puissance au voisinage de la valeur zéro de celui-ci. Sa première borne d'entrée est la borne B5 du circuit électronique de contrôle de charge selon la figure 7. Cette borne B5 est reliée à une des deux entrées d'une porte PO du type NON et dont la sortie B4 est connectée à la borne B4 de la figure 4. La seconde borne d'entrée du circuit de commande est la borne B1 du circuit électronique d'excitation selon la figure 4.FIG. 8 shows an exemplary embodiment of a relay opening control circuit used in a three-phase system, making it possible to cut the current in the power circuits in the vicinity of the zero value thereof. Its first input terminal is terminal B5 of the electronic charge control circuit according to FIG. 7. This terminal B5 is connected to one of the two inputs of a PO gate of the NON type and whose output B4 is connected to the terminal B4 of FIG. 4. The second input terminal of the control circuit is the terminal B1 of the electronic excitation circuit according to FIG. 4.

La borne d'entrée B1 est reliée aux entrées de remise à zéro prioritaires R des bascules BA2 et BA3 ainsi qu'à un circuit à retard constitué par R7 et C10 à travers une diode D12. Ce point commun constitué par la cathode de D12 et une électrode de R7 et C10 est relié à l'entrée d'un inverseur IN3 dont la sortie est connectée aux entrées de remise à 1 prioritaire S des bascules BA2 et BA3.The input terminal B1 is connected to the priority reset inputs R of the flip-flops BA2 and BA3 as well as to a delay circuit constituted by R7 and C10 through a diode D12. This common point constituted by the cathode of D12 and an electrode of R7 and C10 is connected to the input of an inverter IN3, the output of which is connected to the priority 1 reset inputs S of flip-flops BA2 and BA3.

L'entrée de donnée D de la bascule BA2 est portée à un niveau logique 1 représenté par +V.The data input D of the flip-flop BA2 is brought to a logic level 1 represented by + V.

La sortie complémentée M de la bascule BA2 est reliée par l'intermédiaire d'une diode D10 à un circuit à retard formé par une résistance R5 et un condensateur C8 montés en parallèle et reliés à la masse. L'entrée libre du montage RC est relié par l'intermédiaire d'un inverseur IN1 à l'entrée de données d'une bascule BA3. La sortie complémentée K de la bascule BA3 est reliée par une diode D11 à un montage en parallèle du type RC comprenant une résistance R6 et un condensateur C9 relié à la masse, et à un amplificateur suiveur de mise en forme A5. La sortie de celui-ci est relié à la borne de commande B3 du circuit électronique d'excitation selon la figure 4. Le circuit de commande d'ouverture représenté à la figure 8 comporte une deuxième borne de sortie B2 qui est reliée à la borne de commande B2 du circuit d'excitation. Cette sortie est reliée à la sortie d'un inverseur IN2 dont l'entrée est connectée à la sortie de l'inverseur IN1.The complemented output M of the flip-flop BA2 is connected via a diode D10 to a delay circuit formed by a resistor R5 and a capacitor C8 connected in parallel and connected to ground. The free input of the RC assembly is connected via an inverter IN1 to the data input of a flip-flop BA3. The complemented output K of the flip-flop BA3 is connected by a diode D11 to a parallel mounting of the RC type comprising a resistor R6 and a capacitor C9 connected to ground, and to a tracking amplifier A5. The output thereof is connected to the control terminal B3 of the electronic excitation circuit according to FIG. 4. The opening control circuit represented in FIG. 8 comprises a second output terminal B2 which is connected to the terminal B2 control circuit. This output is connected to the output of an inverter IN2 whose input is connected to the output of the inverter IN1.

La seconde entrée la porte PO est reliée à la masse par une résistance appropriée. Un bouton-poussoir IT1 normalement fermé relie les 2 entrées de la porte PO.The second input the PO gate is connected to earth by an appropriate resistance. A normally closed push-button IT1 connects the 2 inputs of the PO door.

On décrira ci-après le fonctionnement du dispositif de commande qui vient d'être décrit, notamment des circuits électroniques de celui-ci.The operation of the control device which has just been described will be described below, in particular of the electronic circuits thereof.

Le circuit électronique d'excitation représenté à la figure 4 a pour fonction de produire un courant impulsionnel C en fonction du temps t indiqué en milliseconde sur la figure 5. Ce courant présente une première période d'intensité élevée permettant la fermeture des contacts 7 des relais, suivie d'un courant d'une valeur plus faible destinée à assurer le maintien à l'état fermé de ces contacts 7. Le courant d'excitation et de fermeture des relais est produit à l'aide du doubleur de tension contenu dans le circuit selon la figure 4. En effet, le montage représenté, formé par les condensateurs C2 et C3 et les diodes de redressement D5 et D6 ainsi que le secondaire du transformateur T permet d'obtenir aux bornes du condensateur C3 une tension V3 double de la tension V1 présent aux bornes du condensateur C1. En effet, la tension V3 aux bornes du condensateur C3 est égale à la somme des tensions aux bornes du condensateur C2 et aux bornes de l'enroulement secondaire du transformateur T. Le condensateur C1 se charge à la tension V1 à travers le pont redresseur PR.The electronic excitation circuit represented in FIG. 4 has the function of producing a pulse current C as a function of the time t indicated in milliseconds in FIG. 5. This current has a first period of high intensity allowing the closure of the contacts 7 of the relay, followed by a current of a lower value intended to ensure that these contacts are kept closed 7. The current excitation and closing of the relays is produced using the voltage doubler contained in the circuit according to Figure 4. Indeed, the assembly shown, formed by the capacitors C2 and C3 and the rectifier diodes D5 and D6 as well that the secondary of the transformer T makes it possible to obtain at the terminals of the capacitor C3 a voltage V3 twice the voltage V1 present at the terminals of the capacitor C1. Indeed, the voltage V3 across the capacitor C3 is equal to the sum of the voltages across the capacitor C2 and across the secondary winding of the transformer T. The capacitor C1 charges at the voltage V1 through the rectifier bridge PR .

Lorsque grâce à une manoeuvre du bouton-poussoir IT2, on applique aux bornes d'entrée de commande B1, B2 et B3 une tension VA appropriée, les transistors Q2 et les montages Darlington Q3, Q4 et Q5, Q6 deviennent conducteurs ce qui permet au condensateur C3 chargé à la tension de plus grande valeur V3 de se décharger à travers la diode D4 et le transistor Q1 qui fournit ainsi au relais 6 le courant de valeur plus élevée représenté à la figure 5, qui assure l'excitation des relais. Après un intervalle de temps déterminé par le montage en série de la résistance R1 et du condensateur C5, le transistor Q2 se trouvant dans le circuit de base du transistor Q1 revient à l'état bloqué et rend non conducteur le transistor Q1. A partir de cet instant, les bobines 6 des relais sont traversées par le courant de plus faible valeur fourni par le condensateur C1, à travers la diode D7. L'application de la tension de commande de fermeture appliquée à l'entrée de commande B1 est synchronisée à la tension du réseau grâce au circuit opto-coupleur OC1, OC2 et la bascule BA1, de sorte que le condensateur Q2 devient conducteur dès le début de la demi-période de conduction des diodes D3 et D2. La bascule BA4 a pour fonction d'éviter le battement (ouvert-fermé) des relais lorsqu'il y a simultanément un défaut de surcharge et le maintien de IT2 en position fermé. Les tensions de commande qui sont appliquées aux entrées B2 et B3 sont engendrées par le circuit représenté à la figure 8, également de façon synchrone à la tension de réseau, comme cela sera décrit plus loin. Le circuit constitué par R10 et C10 a pour rôle d'empêcher la fermeture intempestive des relais à la mise sous tension des différents circuits.When, by actuating the push-button IT2, an appropriate VA is applied to the control input terminals B1, B2 and B3, the transistors Q2 and the Darlington circuits Q3, Q4 and Q5, Q6 become conductive, which allows the capacitor C3 charged at the voltage of greatest value V3 to discharge through the diode D4 and the transistor Q1 which thus supplies to relay 6 the current of higher value represented in FIG. 5, which ensures the excitation of the relays. After a time interval determined by the series connection of the resistor R1 and of the capacitor C5, the transistor Q2 located in the basic circuit of the transistor Q1 returns to the off state and makes the transistor Q1 non-conductive. From this instant, the coils 6 of the relays are crossed by the current of lower value supplied by the capacitor C1, through the diode D7. The application of the closing control voltage applied to the control input B1 is synchronized with the network voltage thanks to the optocoupler circuit OC1, OC2 and the flip-flop BA1, so that the capacitor Q2 becomes conductor from the start of the conduction half-period of the diodes D3 and D2. The function of the flip-flop BA4 is to avoid the flapping (open-closed) of the relays when there is an overload fault simultaneously and to keep IT2 in the closed position. The control voltages which are applied to the inputs B2 and B3 are generated by the circuit shown in FIG. 8, also synchronously with the network voltage, as will be described later. The circuit constituted by R10 and C10 has the role of preventing the inadvertent closing of the relays when the various circuits are energized.

Le circuit de contrôle de charge ou de détection d'une surcharge, est relié aux enroulements secondaires 41 de deux convertisseurs 14 qui sont placés sur deux phases distinctes du rèseau. Aux bornes du condensateur C7 s'établit une tension V5 produite à partir de la tension la plus élevée de celles engendrées par les enroulements 41. Cette tension V5 est appliquée à l'entrée de l'amplificateur A3 qui est monté de façon à présenter un gain par exemple de 7,07. La tension de sortie V6 de cet amplificateur A3 est ainsi égale à 10 fois la valeur efficace du signal d'entrée de plus forte valeur, produite par les enroulements 41. Le montage formé par la résistance R4 et le condensateur C8 retarde l'évolution de la tension V6 à l'entrée du comparateur A4. Ceci autorise la présence de surcharges transitoires dans les circuits de puissance. Le temps t au-delà duquel la détection de surcharge se fait, en fonction du niveau de surcharge α dans le circuit de puissance peut s'exprimer sous la forme :

t = R4.C8 . Ln (

Figure imgb0001
)

avec α représentant le courant circulant divisé par le courant nominal, Ln étant le logarithme naturel.The charge control or overload detection circuit is connected to the secondary windings 41 of two converters 14 which are placed on two distinct phases of the network. At the terminals of the capacitor C7, a voltage V5 is produced produced from the highest voltage of those generated by the windings 41. This voltage V5 is applied to the input of the amplifier A3 which is mounted so as to present a gain for example of 7.07. The output voltage V6 of this amplifier A3 is thus equal to 10 times the effective value of the highest value input signal produced by the windings 41. The circuit formed by the resistor R4 and the capacitor C8 delays the evolution of the voltage V6 at the input of the comparator A4. This allows the presence of transient overloads in the power circuits. The time t beyond which the overload detection is made, as a function of the overload level α in the power circuit can be expressed in the form:

t = R4.C8. Ln (
Figure imgb0001
)

with α representing the circulating current divided by the nominal current, Ln being the natural logarithm.

Si après ce délai de temps t la tension V7 aux bornes du condensateur C8 dépasse la valeur de consigne établie par le potentiomètre 33, le comparateur A4 produit à sa sortie B5, un signal de valeur zéro, indicateur d'une surcharge.If after this time delay t the voltage V7 across the capacitor C8 exceeds the set value established by the potentiometer 33, the comparator A4 produces at its output B5 a signal of zero value, indicating an overload.

Le circuit représenté à la figure 8 commande l'ouverture des relais triphasés avec coupure du courant dans les circuits de puissance au voisinage de la valeur zéro. Lorsque le circuit de détection de surcharge selon la figure 7 produit un signal zéro à sa sortie B5, ou lorsque l'on manoeuvre le bouton-poussoir IT1, la sortie de la porte NON et portant la référence PO passe à l'état 1 qui est appliqué à l'entrée de remise à zéro prioritaire R de la bascule BA1 de la figure 4. Dans ces conditions la sortie de BA1 passe à l'état 0 et la tension aux bornes B1 des figures 4 et 8 s'annule ce qui a pour effet de déverrouiller les entrées de remise à zéro prioritaires R des bascules BA2 et BA3 et de porter la sortie complémentée M de la bascule BA2 à un niveau 0 dès qu'un signal de synchronisation prélevé sur un des deux convertisseurs 14 apparaîtra sur son entrée CK.The circuit shown in Figure 8 controls the opening of the three-phase relays with power cut in the power circuits near the zero value. When the overload detection circuit according to FIG. 7 produces a zero signal at its output B5, or when the push button IT1 is operated, the output of the gate NO and bearing the reference PO goes to state 1 which is applied to the priority reset input R of the flip-flop BA1 in figure 4. Under these conditions the output of BA1 goes to state 0 and the voltage across terminals B1 of figures 4 and 8 is canceled which has the effect of unlocking the priority reset inputs R of flip-flops BA2 and BA3 and carrying the complemented output M of the flip-flop BA2 to a level 0 as soon as a synchronization signal taken from one of the two converters 14 appears on its input CK.

Avec un retard défini par la constante de temps déterminée par la résistance R5 et le condensateur C8, la tension au point N à l'entrée de l'inverseur IN1 s'annule, ce qui provoque à la borne de sortie B2 reliée à la borne B2 du circuit d'excitation de la figure 4 une tension de valeur zéro provoquant le blocage du montage DARLINGTON Q3, Q4. Il est à noter que l'ouverture des contacts 7 des relais alimentés par le courant traversant ce montage Darlington intervient lorsque le courant traversant les relais est décroissant et voisin de la valeur zéro. Les valeurs des composants R5 et C8 sont calculées en fonction de la fréquence du réseau et des caractéristiques mécaniques des relais utilisés. Quand la tension au point N s'annule, l'entrée de données D de la bascule BA3 passe à l'état 1 ce qui produit à la sortie complémentée K de la bascule l'état zéro lors d'un changement d'état vers un état 1 du signal de synchronisation à l'entrée CK obtenu par le deuxième convertisseur représenté à la figure 7 et associé à une deuxième phase du réseau triphasé. Après un délai de temps déterminé par la résistance R6 et le condensateur C9 le signal de sortie à la borne B3 devient zéro, ce qui provoque le blocage du deuxième montage Darlington formé par les transistors Q5 et Q6. Ainsi les relais montés entre les bornes 29 et 27 ne sont plus alimentées en courant et leur contact 7 s'ouvre. Cette ouverture intervient à un instant où le courant traversant les contacts est décroissant et voisin de la valeur zéro. Les valeurs des composants R6 et C9 sont calculées en fonction de la fréquence du réseau et les caractéristiques mécaniques des relais utilisés.With a delay defined by the time constant determined by the resistor R5 and the capacitor C8, the voltage at point N at the input of the inverter IN1 is canceled, which causes the output terminal B2 connected to the terminal B2 of the excitation circuit of FIG. 4 a voltage of zero value causing the blocking of the DARLINGTON assembly Q3, Q4. It should be noted that the opening of the contacts 7 of the relays supplied by the current passing through this Darlington circuit intervenes when the current passing through the relays is decreasing and close to the value zero. The values of components R5 and C8 are calculated according to the frequency of the network and the mechanical characteristics of the relays used. When the voltage at point N is canceled, the data input D of the flip-flop BA3 changes to state 1 which produces at the complemented output K of the flip-flop the state zero during a change of state towards a state 1 of the synchronization signal at the input CK obtained by the second converter shown in FIG. 7 and associated with a second phase of the three-phase network. After a time delay determined by the resistor R6 and the capacitor C9, the output signal at the terminal B3 becomes zero, which causes the blocking of the second Darlington circuit formed by the transistors Q5 and Q6. Thus the relays mounted between terminals 29 and 27 are no longer supplied with current and their contact 7 opens. This opening occurs at a time when the current passing through the contacts is decreasing and close to the zero value. The values of components R6 and C9 are calculated according to the frequency of the network and the mechanical characteristics of the relays used.

Si au moment où apparaît l'ordre de commande d'ouverture à la borne B1, les contacts 7 des relais ne sont traversés par aucun courant, il n'existe pas de signaux de synchronisation sur les entrées CK des bascules BA2 et BA3. Les sorties M et K peuvent quand même être amenées à l'état zéro par le fait que l'état 0 présent sur la borne B1 sera également présent après un délai de temps déterminé par la constante de temps du circuit formé par la résistance R7 et le condensateur C10 à l'entrée de l'inverseur IN3. Ceci provoque la remise à zéro des deux bascules. Etant donné que le délai de temps déterminé par la résistance R7 et C10 est supérieur à la somme des retards déterminés par les circuits RC aux sorties des bascules BA2 et BA3, l'application d'un signal aux entrées S de remise à un des bascules n'est efficace qu'en absence d'un signal de synchronisation aux entrées CK des relais.If at the time when the command to open to terminal B1 appears, the contacts 7 of the relays are not traversed by any current, there are no synchronization signals on the inputs CK of flip-flops BA2 and BA3. The outputs M and K can nevertheless be brought to the zero state by the fact that the state 0 present on the terminal B1 will also be present after a time delay determined by the time constant of the circuit formed by the resistor R7 and the capacitor C10 at the input of the inverter IN3. This causes the two scales to reset. Since the time delay determined by the resistor R7 and C10 is greater than the sum of the delays determined by the RC circuits at the outputs of flip-flops BA2 and BA3, the application of a signal to the reset inputs S to one of the flip-flops is effective only in the absence of a synchronization signal at the CK inputs of the relays.

Par une manoeuvre du bouton-poussoir IT2, la fermeture des contacts 7 des relais intervient quand une tension appropriée est appliquée aux entrées R de mise à zéro des bascules BA2 et BA3, qui sera transmis aux bornes B2 et B3.By operating the IT2 push-button, the contacts 7 of the relays are closed when an appropriate voltage is applied to the inputs R for zeroing flip-flops BA2 and BA3, which will be transmitted to terminals B2 and B3.

Il ressort de la description qui vient d'être faite, du dispositif de commande et de contrôle des circuits de puissance électrique en courant alternatif basse tension, que celui-ci présente un grand nombre d'avantages.It emerges from the description which has just been given, of the command and control device for electric power circuits in low voltage alternating current, that it has a large number of advantages.

Les relais utilisés peuvent être des relais de très grande diffusion du type relais pour automobiles. Etant donné que le courant d'excitation des relais ne circule que pendant un intervalle de temps relativement court nécessaire pour la fermeture des relais et est ensuite réduit à la plus faible valeur de maintien des contacts à l'état fermé, le dispositif de commande peut fonctionner pour une puissance donnée avec un échauffement moindre, un volume réduit et donc un prix de revient inférieur, comparativement au dispositif connu. Etant donné que le circuit d'excitation des relais fonctionne à partir d'une source unique de tension qui peut très favorablement être de la très basse tension, ces relais peuvent être utilisés dans tous les circuits comportant à la fois de la très basse tension tels que des circuits de logique électronique et des circuits de puissance. Du fait que l'ouverture des contacts des relais est synchronisée par rapport à la tension du réseau de façon que les différents contacts se séparent lorsque la valeur du courant qui le traverse est voisine de zéro permet d'augmenter la longévité des relais en supprimant l'usure des contacts par effet de l'arc électrique et de réduire les parasites électromagnétiques engendrés lors de la séparation des contacts.The relays used can be very widespread relays of the relay type for cars. Since the excitation current of the relays only flows for a relatively short time interval necessary for the closing of the relays and is then reduced to the lowest value for maintaining the contacts in the closed state, the control device can operate for a given power with less heating, a reduced volume and therefore a lower cost price, compared to the known device. Since the relay excitation circuit operates from a single voltage source which can very favorably be very low voltage, these relays can be used in all circuits comprising both very low voltage such as electronic logic circuits and power circuits. Because the opening of the relay contacts is synchronized with respect to the network voltage so that the different contacts separate when the value of the current flowing through it is close to zero makes it possible to increase the longevity of the relays by eliminating the wear of the contacts by the effect of the electric arc and reduce the electromagnetic interference generated during the separation of the contacts.

Il est encore avantageux que l'ensemble formé par les relais et les plaquettes de support soit enfermé dans un boîtier isolant comportant des orifices pour le passage des cosses de raccordement pour le ou les circuits de puissance, de telle façon que ces cosses de raccordement fassent saillie hors du boîtier, sur sa face opposée à celle du circuit principal, et des fentes permettant une ventilation naturelle des relais. Il est également avantageux que la fonction liant le courant primaire et la tension secondaire du convertisseur soit linéaire. De plus, la structure du dispositif selon l'invention assure un bon isolement électrique entre les circuits primaire et secondaire.It is also advantageous for the assembly formed by the relays and the support plates to be enclosed in an insulating box comprising orifices for the passage of the connection lugs for the power circuit (s), so that these connection lugs make protrusion out of the housing, on its face opposite to that of the main circuit, and slots allowing natural ventilation of the relays. It is also advantageous for the function linking the primary current and the secondary voltage of the converter to be linear. In addition, the structure of the device according to the invention ensures good electrical insulation between the primary and secondary circuits.

Claims (17)

1. Dispositif pour l'ouverture et la fermeture de circuits de puissance électrique en basse tension, monophasée ou polyphasée, comprenant au moins un relais pourvu d'une bobine de commande alimentée en courant continu à basse tension et au moins un contact de travail incorporé au circuit de puissance associé à chaque phase, caractérisé en ce qu'il comprend un circuit électronique d'excitation d'un relais (4a, b, c ; 5a, b, c) adapté pour fournir à la bobine (6) du relais pendant la durée d'excitation un courant impulsionnel présentant la valeur nécessaire pour l'excitation et ensuite un courant de plus faible valeur réduite à la valeur nécessaire pour le maintien du relais, et des moyens électromagnétiques (14) de détection de surcharges.1. Device for opening and closing low-voltage electric power circuits, single-phase or multi-phase, comprising at least one relay provided with a control coil supplied with direct current at low voltage and at least one working contact incorporated to the power circuit associated with each phase, characterized in that it comprises an electronic circuit for exciting a relay (4a, b, c; 5a, b, c) adapted to supply the coil (6) of the relay during the excitation period a pulse current having the value necessary for the excitation and then a current of lower value reduced to the value necessary for maintaining the relay, and electromagnetic means (14) for detecting overloads. 2. Dispositif de commande selon la revendication 1, caractérisé en ce qu'il comprend un circuit de commande d'ouverture des contacts (7) à une valeur du courant les traversant, qui est voisine de zéro, avantageusement en cas d'une surcharge.2. Control device according to claim 1, characterized in that it comprises a circuit for controlling the opening of the contacts (7) at a value of the current passing through them, which is close to zero, advantageously in the event of an overload. . 3. Dispositif de commande selon l'une des revendications 1 ou 2, caractérisé en ce que le circuit électronique d'excitation comprend une source (T) de très basse tension, des moyens (PR, C1) de production dudit courant de maintien des relais à partir de cette tension et des moyens (C2, C3, D5, D6, T) de production du courant plus élevé d'excitation des relais, tels qu'un doubleur de ladite très basse tension.3. Control device according to one of claims 1 or 2, characterized in that the electronic excitation circuit comprises a source (T) of very low voltage, means (PR, C1) for producing said current for maintaining the relays from this voltage and means (C2, C3, D5, D6, T) for producing the higher excitation current of the relays, such as a doubler of said very low voltage. 4. Dispositif de commande selon la revendication 3, caractérisé en ce que le circuit électronique d'excitation comprend des moyens de commande de coupure du courant d'excitation, tel que des montages à transistors de commutation (Q2 ; Q3, Q4 ; Q5, Q6).4. Control device according to claim 3, characterized in that the electronic excitation circuit comprises means for controlling cut-off of the excitation current, such as switching transistor assemblies (Q2; Q3, Q4; Q5, Q6). 5. Dispositif de commande selon l'une des revendications 1 à 4, caractérisé en ce que les moyens électromagnétiques (14) comprennent un convertisseur courant-tension (14) comprenant un enroulement primaire (46) monté en série avec le circuit de puissance à contrôler et un enroulement secondaire (41) relié électriquement à un circuit détecteur de surcharge.5. Control device according to one of claims 1 to 4, characterized in that the electromagnetic means (14) comprise a current-voltage converter (14) comprising a primary winding (46) mounted in series with the power circuit to control and a secondary winding (41) electrically connected to an overload detector circuit. 6. Dispositif selon la revendication 5, caractérisé en ce que le circuit détecteur de surcharges, pour un système de puissance triphasée, comprend au moins deux montages d'entrée (A1, A2) montés en parallèle, chacun relié à un enroulement secondaire (41) de convertisseur, associé à une phase du système, et adapté pour produire à leur borne de sortie commune une tension représentative de la tension d'entrée la plus èlevée, la sortie commune des montages d'entrée est reliée à une entrée d'un comparateur (A4) dont l'autre entrée est reliée à une tension de référence, par l'intermédiaire d'un circuit à retard (R4, C8) adapté pour empêcher la prise en compte de phénomènes transitoires, tels que des surcharges transitoires.6. Device according to claim 5, characterized in that the overload detection circuit, for a three-phase power system, comprises at least two input circuits (A1, A2) mounted in parallel, each connected to a secondary winding (41 ) of converter, associated with a phase of the system, and adapted to produce at their common output terminal a voltage representative of the highest input voltage, the common output of the input assemblies is connected to an input of a comparator (A4), the other input of which is connected to a reference voltage, via a delay circuit (R4, C8) adapted to prevent the taking into account of transient phenomena, such as transient overloads. 7. Dispositif de commande selon l'une des revendications 2 à 6, caractérisé en ce que le circuit de commande d'ouverture précité comporte une première bascule (BA2) dont l'entrée de données (D) est à l'état 1 et dont la sortie est connectée, par l'intermédiaire d'un circuit à retard (R5, C8), à une deuxième bascule (BA3) reliée par sa sortie, par l'intermédiaire d'un circuit à retard (R6, C9) à une borne de sortie, l'entrée (R) de remise à zéro de chaque bascule étant reliée à la borne de commande (B1) de coupure du courant d'excitation d'intensité élevée et chaque bascule recevant à son entrée d'horloge un signal de synchronisation à une phase correspondant du système triphasé obtenu à partir d'un des convertisseurs (14), et chacune des sorties des circuits à retard constituant une borne (B2, B3) de commande du circuit électronique d'excitation des relais.7. Control device according to one of claims 2 to 6, characterized in that the aforementioned opening control circuit comprises a first flip-flop (BA2) whose data input (D) is in state 1 and whose output is connected, via a delay circuit (R5, C8), to a second flip-flop (BA3) connected by its output, via a delay circuit (R6, C9) at an output terminal, the input (R) for resetting to zero of each flip-flop being connected to the control terminal (B1) for cutting off the high intensity excitation current and each flip-flop receiving at its clock input a synchronization signal with a corresponding phase of the three-phase system obtained from one of the converters (14), and each of the outputs of the delay circuits constituting a terminal (B2, B3) for controlling the relay electronic excitation circuit. 8. Dispositif de commande selon la revendication 7, caractérisé en ce que le circuit de commande d'ouverture comporte des moyens de commande d'ouverture indépendants du circuit de détection de surcharge (IT1, PO, BA1), tel que des moyens de commande manuelle (IT1).8. Control device according to claim 7, characterized in that the opening control circuit comprises opening control means independent of the overload detection circuit (IT1, PO, BA1), such as control means manual (IT1). 9. Dispositif de commande selon l'une des revendications 7 ou 8, caractérisé en ce que le circuit de commande d'ouverture comprend des moyens d'ouverture des contacts des relais en cas d'absence d'un signal de synchronisation, ces moyens étant formés par un agencement comprenant un circuit à retard (R7, C10) relié à l'entrée (S) de remise à 1 des deux bascules (BA2, BA3), le retard défini par le circuit à retard (R7, C10) étant supérieur à la somme des retards des circuits à retard (R5, C8 et R6, C9) associés aux deux bascules (BA2, BA3).9. Control device according to one of claims 7 or 8, characterized in that the opening control circuit comprises means for opening the contacts of the relays in the absence of a synchronization signal, these means being formed by an arrangement comprising a delay circuit (R7, C10) connected to the reset input (S) of 1 of the two flip-flops (BA2, BA3), the delay defined by the delay circuit (R7, C10) being greater than the sum of the delays of the delay circuits (R5, C8 and R6, C9) associated with the two flip-flops (BA2, BA3). 10. Dispositif de commande selon l'une des revendications précédentes, caractérisé en ce que le convertisseur du courant-tension (14) comprend un enroulement primaire (46) et un enroulement secondaire (41), montés concentriquement autour d'un même noyau (40) constituant un circuit magnétique ouvert, avantageusement en un matériau ferro-magnétique tel que de l'acier doux.10. Control device according to one of the preceding claims, characterized in that the current-voltage converter (14) comprises a primary winding (46) and a secondary winding (41), mounted concentrically around the same core (40) constituting an open magnetic circuit, advantageously made of a ferro-magnetic material such as mild steel. 11. Dispositif de commande selon l'une des revendications précédentes, caractérisé en ce qu'il comprend au moins deux relais (4a, b, c, 5a, b, c) pour circuits imrpimés, dont les bobines (6) sont montées en parallèle et dont les contacts (7) sont montés en série dans le circuit de puissance correspondant, ces relais pouvant être des relais de grande diffusion du type relais pour automobile.11. Control device according to one of the preceding claims, characterized in that it comprises at least two relays (4a, b, c, 5a, b, c) for printed circuits, the coils (6) of which are mounted in parallel and whose contacts (7) are mounted in series in the corresponding power circuit, these relays can be mass distribution relays of the automotive relay type. 12. Dispositif de commande selon l'une des revendications précédentes, caractérisé en ce qu'il comprend une plaquette de base (1) porteuse d'un circuit imprimé principal, et, pour chaque relais, une plaquette de support (2, 3) à circuits imrpimés, montée perpendiculairement à la plaquette de base (1), les conducteurs de puissance et du courant à basse tension étant réalisés sous forme de circuits imprimés, les conducteurs de puissance des plaquettes de support (2, 3) et de la plaquette de base (1) étant avantageusement reliés par des conducteurs soudès (11, 12).12. Control device according to one of the preceding claims, characterized in that it comprises a base plate (1) carrying a main printed circuit, and, for each relay, a support plate (2, 3) with printed circuits, mounted perpendicular to the base plate (1), the power and low-voltage current conductors being in the form of printed circuits, the power conductors of the support plates (2, 3) and of the plate base (1) being advantageously connected by soldered conductors (11, 12). 13. Dispositif de commande selon la revendication 12, caractérisé en ce qu'il comprend pour un système de puissance triphasé, une paire de relais associée à chaque phase et les trois paires (4a, 5a ; 4b, 5b ; 4c, 5c) sont disposées l'une à côté des autres, les trois relais correspondants desdites paires étant fixés de préférence avec les relais d'une paire situés en regard l'un de l'autre, sur deux plaquettes de support (2, 3) distinctes, avantageusement conformées de la même manière et s'étendant perpendiculairement à ladite plaquette de base (1).13. Control device according to claim 12, characterized in that it comprises for a three-phase power system, a pair of relays associated with each phase and the three pairs (4a, 5a; 4b, 5b; 4c, 5c) are arranged one next to the other, the three corresponding relays of said pairs being preferably fixed with the relays of a pair located opposite one another, on two separate support plates (2, 3), advantageously shaped in the same way and extending perpendicular to said base plate (1). 14. Dispositif selon l'une des revendications 11 à 13, caractérisé en ce que l'ensemble formé par les relais (4a, b, c ; 5a, b, c) et les plaquettes de support (2, 3) sont enfermées dans un boîtier isolant (18) comportant des orifices (19, 20) pour le passage des cosses de raccordement (9, 10) pour le ou les circuits de puissance, de telle façon que ces cosses de raccordement fassent saillie hors du boîtier, sur sa face opposée à celle du circuit principal, et des fentes permettant une ventilation naturelle des relais.14. Device according to one of claims 11 to 13, characterized in that the assembly formed by the relays (4a, b, c; 5a, b, c) and the support plates (2, 3) are enclosed in an insulating housing (18) comprising orifices (19, 20) for the passage of the connection lugs (9, 10) for the power circuit (s), so that these connection lugs protrude from the housing, on its opposite side to that of the main circuit, and slots allowing natural ventilation of the relays. 15. Dispositif de commande selon l'une des revendications précédentes, caractérisé en ce que les moyens de détection de surcharge comprennent un organe de réglage du seuil de surcharge admissible dans les circuits de puissance contrôlés, tels qu'un potentiomètre (33), dont l'organe de commande est accessible de l'extérieur du boîtier (18) à travers un orifice approprié.15. Control device according to one of the preceding claims, characterized in that the overload detection means comprise a member for adjusting the admissible overload threshold in the controlled power circuits, such as a potentiometer (33), the control member is accessible from the outside of the housing (18) through a suitable opening. 16. Dispositif de commande selon l'une des revendications 10 à 15, caractérisé en ce que les bornes d'entrée et de sortie (42, 43) de l'enroulement secondaire (41) du convertisseur (14) sont réalisées sous forme de plots qui sont emmanchés à force dans des trous pratiqués dans un boîtier (45) du convertisseur (14).16. Control device according to one of claims 10 to 15, characterized in that the input and output terminals (42, 43) of the secondary winding (41) of the converter (14) are made in the form of studs which are force fitted into holes made in a housing (45) of the converter (14). 17. Dispositif de commande selon l'une des revendications 10 à 16, caractérisé en ce que le convertisseur (14) comprend un boîtier (45) dans lequel la bobine d'enroulement secondaire (41) est fixée avantageusement par addition d'une résine de remplissage, l'enroulement primaire (46) pouvant être monté concentriquement à ladite bobine à l'extérieur du boîtier (45).17. Control device according to one of claims 10 to 16, characterized in that the converter (14) comprises a housing (45) in which the secondary winding coil (41) is advantageously fixed by addition of a resin of filling, the primary winding (46) being able to be mounted concentrically with the said coil outside the housing (45).
EP88401993A 1987-03-16 1988-07-29 Control device for switching an electrical power circuit on and off Withdrawn EP0352391A1 (en)

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US4893101A (en) * 1988-10-21 1990-01-09 Ericson Manufacturing Company Resettable ground fault circuit interrupter
EP1120806B1 (en) * 2000-01-28 2013-11-13 ELESTA relays GmbH Safety relay, the use of such a relay and switching device with it
ATE426911T1 (en) 2000-04-03 2009-04-15 Elesta Relays Gmbh RELAY

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Also Published As

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FR2612685B1 (en) 1992-11-06
FR2612685A1 (en) 1988-09-23

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