FR2615012A1 - CONTROL CIRCUIT FOR ELECTRIC REMOTE CONTROL DEVICES, ESPECIALLY REMOTE SWITCHES, AND APPARATUS INCORPORATING THE SAME - Google Patents

Abstract

The circuit is arranged inside the circuit (bb) fed via the network with push-buttons (BP) associated with neon indicator lamps (N), and is connected to the coil (B) of the remote-control apparatus. It comprises a diode bridge (D) associated with a thyristor (Th) and a resistor (R), first means with a resistor R2, a capacitor (C2) in parallel with a Zener diode for disabling the gate transistor (T) after a specified period following the impedance drop caused by operating the push-button, and second means comprising a capacitor (C1) in parallel with the terminals of the bridge (D) for returning the whole to the conductive state.

Description

Control circuit for electric remote control devices

  triques, in particular remote control switches, and apparatus incorporating this circuit. The present invention relates to a control circuit for electrical remote control devices with bistable mechanism such as remote control switches, and comprising

  motor means, such as a coil, and intended to be

  run by a mains electric current to pro-

  talk about a change in device state, the new state

  remaining maintained without requiring electrical energy consumption

driving stick.

  The invention also relates to electrical remote control devices of this type, and in particular

  remote switches, timers, relays, time relays, built-in

on this circuit.

  In French patent application FR-A-2 583 192, filed on June 11, 1985 by the applicant, an electrical remote control device, such as a remote control switch, with a bistable mechanism and comprising wound motor means intended to be traversed by an electric motor current from the network to cause a change of state of the device, the new state remaining maintained without consumption of electric driving energy, and control means actuated for a random period or not to address the electric current motor with wound motor means, characterized in that the dimensioning of said

  means wound motors is less than that which supports

  ter.un continuous passage of the electric motor current or the highest voltage relating to the supply of said motor means, and in that said control means complete an electronic circuit sensitive to a control member which can be actuated, from a source of current from the network, for a random duration to deliver, to said wound motor means, a driving pulse of electric motor current from the network, of short duration. The present invention proposes to provide such

  particularly improved electronic circuit.

  An objective, in particular of the invention

  is to provide such a circuit for delivering, to

  said motor means, such as a coil, a pulse of

short duration well calibrated.

  Another object of the invention is to

  realize such a circuit which is particularly reliable.

  Another objective of the invention is to produce such a circuit making it possible to supply the motor means with the energy necessary for the tilting of a bistable mechanism, which is capable of detecting the release of a manual control member such as a button -pusher, making the device it controls ready to receive again

the next order.

  The subject of the invention is an electrical circuit

  control unit for remote control devices, said circuit

  cooked being intended to be actuated by a com-

  control, for example a push button, associated with an impedance, for example one or more indicator lights, said

  electronic control circuit being arranged in the circuit

  cooked, supplied for example by the network, supplying a motor means, for example a coil, the remote control device, via said control member,

  characterized in that it comprises first sensitive means

  bles to a drop in impedance of said supply circuit, to remain conductive for a short determined period allowing the motor supply of said motor means, then cease to be conductive at the end of said duration, and second means sensitive to a increased impedance

  of said supply circuit, to become conductive again.

  In a preferred embodiment, the electronic control circuit can comprise a thyristor associated with a resistor in series, with its trigger control means, said thyristor being associated with a diode bridge to be maintained in the conducting state.

  following each alternation of the network.

  The first means can advantageously include a detection circuit sensitive to the drop in impedance in the supply circuit, said detection circuit being associated with the thyristor trigger control means for inhibiting the thyristor at the end of said

short term.

  Advantageously, this detection circuit can comprise a resistor and a capacitor in series, said capacitor being in parallel with a Zener diode controlling a gate control transistor of the thyristor, said capacitor being normally discharged below the conduction threshold of the Zener diode; which then keeps the transistor in the off state, the thyristor trigger then being in the activated state, said capacitor gradually charging in the event of a drop in impedance of the supply circuit up to

  exceed the conduction threshold of the Zener diode, provo-

  as for the inhibition of the thyristor trigger,

  in the non-conductive electronic circuit.

  The second means sensitive to an increase

  The impedance of the supply circuit preferably includes a capacitor in parallel with the alternative terminals of the diode bridge to apply, in the event of an increase in the impedance of the supply circuit, a lower voltage on said terminals. diode bridge alternatives, preventing thyristor control means

to inhibit the trigger current.

  Other advantages and characteristics of

  the invention will appear on reading the description

  following, made by way of nonlimiting example and referring to the appended drawing in which: FIG. 1 represents a diagram of an electronic control circuit according to the invention,

  Figure 2 shows a function diagram.

  operation of this circuit in which the curves 1, m, n, o, p respectively represent the state, over time, of the push button, of the capacitor C2, of the motor current, of the

transistor T and thyristor Th.

  The remote control device intended to be controlled is a remote control switch represented, schematically, in A and incorporated in a circuit of use aa. This remote control switch A comprises a coil B actuating a bistable mechanism M. The coil B is interposed in the supply circuit bb of the alternating network, for example 220 Volts. In the supply circuit bb is located

  interposed a plurality of control members B1, B2, ...

  Bn each comprising a push button BP in parallel with a neon lamp serving as indicator lamp N. When one

  at least one of the push buttons is operated by a user

  tor, it short-circuits its control lamp N, causing a drop in the impedance of the supply circuit bb. In the absence of the electronic control circuit according to the invention, the coil B of the remote control switch is then subjected to the full power of the supply circuit for the entire period during which the push button is activated, which would require a dimensioning of coil B capable of resisting this power, clearly superfluous since

  the bistable mechanism M then tilted for a long time.

26 15 012

  The electronic circuit according to the invention comprises a diode bridge D interposed on the supply circuit bb, the junctions 1 and 2 of the bridge being

  connected to the bb supply circuit and the junctions

  pendulars 3, 4 to electronic circuit conductors, 6. Between conductors 5 and 6, lie

  find a thyristor Th arranged with its blocking diode

  cage d and a low resistance in series R. This assembly allows the thyristor to be traversed by the current

  at each alternation of the network.

  The trigger g of the thyristor Th is actuated by a trigger control transistor T interposed between the conductors 5 and 6 with a resistor in series R1 of

important value.

  The base of transistor T is connected via a resistor R3 to a Zener diode Z leading to the junction between a resistor of significant value R2 and a capacitor C2, this assembly forming said first means, sensitive to a drop in impedance

in the supply circuit bb.

  The second means, sensitive to an increase

  impedance of the supply circuit, are constituted by a capacitor C1 in parallel with the diode bridge D. The operation is as follows: In the idle state, no push button BP is actuated and the circuit power supply bb has a high impedance, of the order of a few kilo-ohms to infinity, depending on the number of P1-PN devices connected. In this state, the thyristor Th is maintained in the conducting state by means of the trigger resistor R1 at each alternation of the sector coming from the diode bridge, the

  capacitor C2 being discharged below the threshold of con-

  duction of said Zener Z diode, so that the current of

  trigger through transistor T is not inhibited.

26150 12

  At the closing (instant tO) of one of the push-buttons BP, the impedance in the supply circuit bb drops suddenly, allowing the passage of the motor current in the coil B of the remote control switch A so that the bistable mechanism M rocking. In addition, a high alternating voltage appears across the diode bridge D, so that the capacitor C2 gradually charges

  (curve m). After a short period of time, the

  DC voltage of capacitor C2 exceeds the threshold of Zener diode Z (instant tl). The transistor T then turns on and inhibits the gate current of the thyristor Th. Consequently, at the next voltage alternation (instant t2), the thyristor Th is no longer conductive and the motor current of the coil B is interrupted, the only remaining current being that, very weak, which crosses, on the one hand, the capacitor C1 and, on the other hand, the

  resistors R2 and Ri which in fact impose an unconscious state

  conductor to the electronic control circuit. This state remains maintained as long as at least one of the BP pushbuttons remains activated either intentionally or through a malfunction. When the push button BP is released (instant t3), its neon lamp N is switched on again

  and the impedance of the supply circuit bb is increased.

  The capacitor Cl placed at the terminals of the diode bridge D

  detects this increase in impedance by taking a

  moderately high voltage which it imposes on junctions 3, 4 of bridge D. Consequently, the DC voltage of capacitor C2 decreases below the threshold of the Zener diode (instant t4). The transistor T is then blocked and can no longer inhibit the gate current of the thyristor Th which becomes conductive again at the next alternation of the supply sector bb (instant t5). The electronic circuit is then found in the conductive state which remains maintained

  until the next actuation of a pot-button.

  Although the invention has been described in connection with a particular embodiment, it is understood that it can be made various modifications; thus the Zener diode, for example, can be replaced by any threshold device, such as for example neon lamp, diac,

  programmable unijunction transistor etc ...

Claims (8)

  1. Electronic circuit for controlling remote control devices, said circuit being intended to be actuated by a control member (BP) associated with an impedance (N), said control circuit being arranged in the supply circuit (bb) motor means (B) of the remote control device, via said control member (BP), characterized in that it comprises first - means (R2, C2, Z) sensitive to a fall of impedance of said supply circuit (bb), to remain conductive for a short determined period allowing the motor supply of said motor (B), then to cease to be conductive at the end of said duration, and second means (C1) sensitive to an increase in impedance of said circuit   power supply (bb), to become a driver again.   2. Circuit according to claim 1, characterized in that it comprises a thyristor (Th) with its trigger control means (R1, T), said thyristor being associated with a diode bridge (D) to be maintained at the 'state   conductor at each alternation of the network.   3. Circuit according to claim 2, characterized in that said first means comprise a detection circuit (R2, C2, Z) sensitive to the drop in impedance in the supply circuit, said detection circuit being associated with means of thyristor trigger control (T) to inhibit the thyristor at the end of said thyristor short predetermined duration.   4. Circuit according to claim 3, characterized in that said detection circuit comprises a capacitor (C2) in parallel with a Zener diode (Z)   connected to the thyristor trigger control means.   5. Circuit according to claim 4, characterized in that said detection circuit is connected to a trigger control transistor (T) (g) of thyristor (Th). -   6. Circuit according to any one of   claims 2 to 5, characterized in that said second   means, sensitive to an increase in impedance of the supply circuit, comprise a capacitor (C1) in parallel   with the alternative terminals of the diode bridge.   7. Circuit according to any one of claims 1 to 6, characterized in that the control member   is a push button (BP) associated with a control lamp (N).   8. Electric remote control devices with bistable mechanism, in particular remote control switches, timers,   relays, time relays, incorporating the electrical circuit   control unit according to any one of the claims 1 to 7.