EP0881623A1 - Control circuit for a vibrating membrane - Google Patents

Control circuit for a vibrating membrane Download PDF

Info

Publication number
EP0881623A1
EP0881623A1 EP98410052A EP98410052A EP0881623A1 EP 0881623 A1 EP0881623 A1 EP 0881623A1 EP 98410052 A EP98410052 A EP 98410052A EP 98410052 A EP98410052 A EP 98410052A EP 0881623 A1 EP0881623 A1 EP 0881623A1
Authority
EP
European Patent Office
Prior art keywords
solenoid
capacitor
switch
thyristor
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98410052A
Other languages
German (de)
French (fr)
Other versions
EP0881623B1 (en
Inventor
André Bremond
Philippe Merceron
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STMicroelectronics SA
Original Assignee
STMicroelectronics SA
SGS Thomson Microelectronics SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by STMicroelectronics SA, SGS Thomson Microelectronics SA filed Critical STMicroelectronics SA
Publication of EP0881623A1 publication Critical patent/EP0881623A1/en
Application granted granted Critical
Publication of EP0881623B1 publication Critical patent/EP0881623B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
    • G10K9/13—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using electromagnetic driving means
    • G10K9/15—Self-interrupting arrangements

Definitions

  • the present invention relates to control circuits vibrating membrane used in particular as a car horn or alarm device.
  • FIG. 1 represents a conventional control circuit of a vibrating membrane.
  • a membrane M is placed relative to an S solenoid to be attracted to it when this solenoid produces an exciting field.
  • the solenoid is arranged in a serial circuit comprising a continuous supply E, for example an automobile battery, a start switch P, and a breaker B which opens when the membrane M reaches an extension corresponding for example to the membrane position shown dashed and designated by M '.
  • the bet switch en route P is for example a push button switch or a switch controlled by an external circuit such as a circuit fault detection device intended to trigger an alarm.
  • the operation of this circuit is as follows.
  • the switch B In the initial state, the switch B is closed and, as soon as the push button P is activated, a current flows in the solenoid S and attracts the membrane towards its position M '. When the membrane is in position M ', the breaker B opens and the membrane returns to its position of rest. This is repeated as long as the switch P remains closed.
  • This circuit has the disadvantage that the opening of the breaker B occurs when the current in the solenoid is maximum. Such a sudden opening of a circuit generates creation of cut-off pulses and the creation of parasites radio frequency which can affect linked circuits to the vibrator control circuit or neighbors thereof, by example of other electronic circuits in an automobile. Also, in the case of an alarm circuit, if the source E corresponds to a rectified power source, spurious signals can go back to the main supply.
  • the present invention aims to overcome these drawbacks and to provide a vibrator control circuit not producing practically no parasites.
  • the present invention provides a control circuit for an excited vibrating membrane by a solenoid in series with a continuous supply and a controlled switch, comprising a capacitor disposed at the terminals of a series circuit including the solenoid and the switch ; and means for opening the switch in the vicinity of a zero current crossing in the inductor.
  • the controlled switch consists of a thyristor arranged between the first terminal of the capacitor and the first terminal of the solenoid, the thyristor trigger being connected to said first terminal of the capacitor by a Zener diode and the trigger of the thyristor being connected to its cathode via a resistance, said thyristor intrinsically constituting the means of opening in the vicinity of a zero crossing of the current.
  • the circuit further comprises a resistor in series between the supply and the capacitor to set the time constant of charge of it.
  • the present invention provides for inserting the solenoid exciter of a vibrating membrane in a resonant circuit for obtain in this solenoid an oscillating current, i.e. a increasing current then passing through zero. Then this invention provides for interrupting the supply of the solenoid to the moment when the current in it reaches a zero value. This opening of the circuit being done at zero current, no parasite will not be generated.
  • Figure 2 shows a block diagram illustrating the general operation of a circuit according to the present invention.
  • an S solenoid is placed in a serial circuit comprising a power source E, a switch P and a SW switch.
  • the circuit includes a capacitor C disposed across the series circuit comprising the solenoid and SW switch.
  • a resistance R is placed in series in the circuit comprising the power source E, switch P and capacitor C.
  • Switch SW is controlled by a control circuit 1 which ensures the closing of the SW switch when it receives, on an ON input, an indication that the voltage on capacitor C exceeds one threshold determined.
  • the SW switch is open when the control circuit 1 receives on a second OFF input a indication that the current in the solenoid, detected by a detector 3, reaches a substantially zero value.
  • the control circuit 1 closes the SW switch.
  • the loop including capacitor C and the solenoid S then functions as an oscillating circuit.
  • the current increases rapidly then decreases while the membrane M is attracted.
  • the SW switch is open. The cycle is repeated as long as the switch P remains closed.
  • the present invention provides modes of particularly simple practical realization of the circuit of the figure 2.
  • FIG. 3 An embodiment is illustrated in FIG. 3.
  • a thyristor Th1 is connected between a first terminal A of capacitor C and a first terminal B of solenoid S.
  • a Zener Z diode is connected between the trigger of the thyristor Th1 and the first terminal of capacitor C and a resistor R1 is connected between trigger and cathode of thyristor Th1.
  • the voltage VAM across the capacitor C increases to 9 volts in about 3 milliseconds.
  • the voltage V BM at the terminals of the solenoid increases abruptly and the current I S in it passes through successive phases of growth then of decay to reach a zero value after approximately 2 milliseconds. The cycle is then repeated periodically.
  • the present invention is capable of various variants and modifications which will appear to the man of art.
  • the vibrator's operating cycle may be modified by modifying the value of resistance R and the relative values of the capacitor and the inductance of the solenoid to obtain a desired tone.
  • any device with a threshold other than a simple Zener diode could be used.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Magnetic Treatment Devices (AREA)
  • Relay Circuits (AREA)

Abstract

The circuit provides control for a vibrating membrane (M) which is excited by a solenoid (S) mounted in series with a continuous supply (E) and a control switch (SW). A capacitor (C ) is arranged across the terminals of a series circuit comprising the solenoid (S) and the switch (SW). A device is provided to open the switch (SW) close the point when the current in the inductance passes through zero. The controlled switch may consist of a thyristor connected between the first terminal (A) of the capacitor and the first terminal (B) of the solenoid. The gate of the thyristor is connected to the first capacitor terminal by a Zener diode, and to its cathode via a resistance (R1). The thyristor provides the mechanism whereby the opening occurs in the vicinity of the zero crossing of the current.

Description

La présente invention concerne des circuits de commande de membrane vibrante utilisée notamment comme Klaxon d'automobile ou dispositif d'alarme.The present invention relates to control circuits vibrating membrane used in particular as a car horn or alarm device.

La figure 1 représente un circuit classique de commande d'une membrane vibrante. Une membrane M est placée par rapport à un solénoïde S pour être attirée par celui-ci quand ce solénoïde produit un champ excitateur. Le solénoïde est disposé dans un circuit série comprenant une alimentation continue E, par exemple une batterie d'automobile, un interrupteur de mise en route P, et un rupteur B qui s'ouvre quand la membrane M atteint une extension correspondant par exemple à la position de membrane représentée en pointillés et désignée par M'. L'interrupteur de mise en route P est par exemple un interrupteur à bouton poussoir ou un interrupteur commandé par un circuit externe tel qu'un circuit de détection de défaut destiné à déclencher une alarme. Le fonctionnement de ce circuit est le suivant. A l'état initial, le rupteur B est fermé et, dès que le bouton poussoir P est actionné, un courant circule dans le solénoïde S et attire la membrane vers sa position M'. Quand la membrane est à la position M', le rupteur B s'ouvre et la membrane revient à sa position de repos. Ceci se répète tant que l'interrupteur P reste fermé. FIG. 1 represents a conventional control circuit of a vibrating membrane. A membrane M is placed relative to an S solenoid to be attracted to it when this solenoid produces an exciting field. The solenoid is arranged in a serial circuit comprising a continuous supply E, for example an automobile battery, a start switch P, and a breaker B which opens when the membrane M reaches an extension corresponding for example to the membrane position shown dashed and designated by M '. The bet switch en route P is for example a push button switch or a switch controlled by an external circuit such as a circuit fault detection device intended to trigger an alarm. The operation of this circuit is as follows. In the initial state, the switch B is closed and, as soon as the push button P is activated, a current flows in the solenoid S and attracts the membrane towards its position M '. When the membrane is in position M ', the breaker B opens and the membrane returns to its position of rest. This is repeated as long as the switch P remains closed.

Ce circuit présente l'inconvénient que l'ouverture du rupteur B se produit quand le courant dans le solénoïde est maximum. Une telle ouverture brutale d'un circuit engendre la création d'impulsions de coupure et la création de parasites radio fréquence qui peuvent se répercuter sur des circuits liés au circuit de commande de vibreur ou voisins de celui-ci, par exemple d'autres circuits électroniques d'une automobile. Egalement, dans le cas d'un circuit d'alarme, si la source E correspond à une source d'alimentation redressée, les signaux parasites pourront remonter vers l'alimentation principale.This circuit has the disadvantage that the opening of the breaker B occurs when the current in the solenoid is maximum. Such a sudden opening of a circuit generates creation of cut-off pulses and the creation of parasites radio frequency which can affect linked circuits to the vibrator control circuit or neighbors thereof, by example of other electronic circuits in an automobile. Also, in the case of an alarm circuit, if the source E corresponds to a rectified power source, spurious signals can go back to the main supply.

La présente invention vise à pallier ces inconvénients et à prévoir un circuit de commande de vibreur ne produisant pratiquement pas de parasites.The present invention aims to overcome these drawbacks and to provide a vibrator control circuit not producing practically no parasites.

Pour atteindre ces objets, la présente invention prévoit un circuit de commande d'une membrane vibrante excitée par un solénoïde en série avec une alimentation continue et un commutateur commandé, comprenant un condensateur disposé aux bornes d'un circuit série comprenant le solénoïde et le commutateur ; et des moyens pour ouvrir le commutateur au voisinage d'un passage à zéro du courant dans l'inductance.To achieve these objects, the present invention provides a control circuit for an excited vibrating membrane by a solenoid in series with a continuous supply and a controlled switch, comprising a capacitor disposed at the terminals of a series circuit including the solenoid and the switch ; and means for opening the switch in the vicinity of a zero current crossing in the inductor.

Selon un mode de réalisation de la présente invention, le commutateur commandé est constitué d'un thyristor disposé entre la première borne du condensateur et la première borne du solénoïde, la gâchette du thyristor étant connectée à ladite première borne du condensateur par une diode Zener et la gâchette du thyristor étant connectée à sa cathode par l'intermédiaire d'une résistance, ledit thyristor constituant intrinsèquement le moyen d'ouverture au voisinage d'un passage à zéro du courant.According to an embodiment of the present invention, the controlled switch consists of a thyristor arranged between the first terminal of the capacitor and the first terminal of the solenoid, the thyristor trigger being connected to said first terminal of the capacitor by a Zener diode and the trigger of the thyristor being connected to its cathode via a resistance, said thyristor intrinsically constituting the means of opening in the vicinity of a zero crossing of the current.

Selon un mode de réalisation de la présente invention, le circuit comprend en outre une résistance en série entre l'alimentation et le condensateur pour fixer la constante de temps de charge de celui-ci.According to an embodiment of the present invention, the circuit further comprises a resistor in series between the supply and the capacitor to set the time constant of charge of it.

Ces objets, caractéristiques et avantages, ainsi que d'autres de la présente invention seront exposés en détail dans la description suivante de modes de réalisation particuliers faite à titre non-limitatif en relation avec les figures jointes parmi lesquelles :

  • la figure 1 décrite précédemment représente un circuit classique de commande de vibreur ;
  • la figure 2 représente un schéma partiellement sous forme de blocs d'un circuit de commande de vibreur selon la présente invention ;
  • la figure 3 représente un mode de réalisation de la présente invention ; et
  • la figure 4 représente des courbes de tension et de courant correspondant au circuit de la figure 3.
    • These objects, characteristics and advantages, as well as others of the present invention will be explained in detail in the following description of particular embodiments given without limitation in relation to the attached figures among which:
  • Figure 1 described above shows a conventional vibrator control circuit;
  • 2 shows a diagram partially in the form of blocks of a vibrator control circuit according to the present invention;
  • Figure 3 shows an embodiment of the present invention; and
  • FIG. 4 represents voltage and current curves corresponding to the circuit of FIG. 3.

    • La présente invention prévoit d'insérer le solénoïde excitateur d'une membrane vibrante dans un circuit résonant pour obtenir dans ce solénoïde un courant oscillant, c'est-à-dire un courant croissant puis passant par zéro. Ensuite, la présente invention prévoit d'interrompre l'alimentation du solénoïde au moment où le courant dans celui-ci atteint une valeur nulle. Cette ouverture du circuit se faisant à courant nul, aucun parasite ne sera généré.The present invention provides for inserting the solenoid exciter of a vibrating membrane in a resonant circuit for obtain in this solenoid an oscillating current, i.e. a increasing current then passing through zero. Then this invention provides for interrupting the supply of the solenoid to the moment when the current in it reaches a zero value. This opening of the circuit being done at zero current, no parasite will not be generated.

    La figure 2 représente un schéma sous forme de blocs illustrant le fonctionnement général d'un circuit selon la présente invention.Figure 2 shows a block diagram illustrating the general operation of a circuit according to the present invention.

    Comme précédemment, un solénoïde S est placé dans un circuit série comprenant une source d'alimentation E, un interrupteur P et un commutateur SW. En outre, le circuit comprend un condensateur C disposé aux bornes du circuit série comprenant le solénoïde et le commutateur SW. De préférence, une résistance R est placée en série dans le circuit comprenant la source d'alimentation E, l'interrupteur P et le condensateur C. Le commutateur SW est commandé par un circuit de commande 1 qui assure la fermeture du commutateur SW quand il reçoit, sur une entrée ON, l'indication que la tension sur le condensateur C dépasse un seuil déterminé. Ceci a été schématiquement représenté par l'utilisation d'un comparateur 2 recevant sur son entrée (+) la tension aux bornes du condensateur C et sur son entrée (-) une tension de référence REF. Le commutateur SW est ouvert quand le circuit de commande 1 reçoit sur une deuxième entrée OFF une indication du fait que le courant dans le solénoïde, détecté par un détecteur 3, atteint une valeur sensiblement nulle.As before, an S solenoid is placed in a serial circuit comprising a power source E, a switch P and a SW switch. In addition, the circuit includes a capacitor C disposed across the series circuit comprising the solenoid and SW switch. Preferably, a resistance R is placed in series in the circuit comprising the power source E, switch P and capacitor C. Switch SW is controlled by a control circuit 1 which ensures the closing of the SW switch when it receives, on an ON input, an indication that the voltage on capacitor C exceeds one threshold determined. This has been schematically represented by the use of a comparator 2 receiving on its input (+) the voltage across capacitor C and on its input (-) a reference voltage REF. The SW switch is open when the control circuit 1 receives on a second OFF input a indication that the current in the solenoid, detected by a detector 3, reaches a substantially zero value.

    Le fonctionnement de ce circuit est le suivant.The operation of this circuit is as follows.

    Dès que le bouton poussoir P est pressé, le condensateur C se charge et quand il atteint une tension légèrement inférieure à la valeur de tension de la source d'alimentation E, déterminée par la valeur de référence REF, le circuit de commande 1 ferme le commutateur SW. La boucle comprenant le condensateur C et le solénoïde S fonctionne alors comme un circuit oscillant. Le courant croít rapidement puis décroít tandis que la membrane M est attirée. Dès que le courant dans le solénoïde S atteint une valeur sensiblement nulle, le commutateur SW est ouvert. Le cycle se répète tant que l'interrupteur P reste fermé.As soon as the push button P is pressed, the capacitor C charges and when it reaches a slightly lower voltage at the voltage value of the power source E, determined by the REF reference value, the control circuit 1 closes the SW switch. The loop including capacitor C and the solenoid S then functions as an oscillating circuit. The current increases rapidly then decreases while the membrane M is attracted. As soon as the current in the solenoid S reaches a value substantially zero, the SW switch is open. The cycle is repeated as long as the switch P remains closed.

    En outre, la présente invention prévoit des modes de réalisation pratiques particulièrement simples du circuit de la figure 2.Furthermore, the present invention provides modes of particularly simple practical realization of the circuit of the figure 2.

    Un mode de réalisation est illustré en figure 3. Dans ce mode de réalisation, un thyristor Th1 est connecté entre une première borne A du condensateur C et une première borne B du solénoïde S. Une diode Zener Z est connectée entre la gâchette du thyristor Th1 et la première borne du condensateur C et une résistance R1 est connectée entre gâchette et cathode du thyristor Th1.An embodiment is illustrated in FIG. 3. In this embodiment, a thyristor Th1 is connected between a first terminal A of capacitor C and a first terminal B of solenoid S. A Zener Z diode is connected between the trigger of the thyristor Th1 and the first terminal of capacitor C and a resistor R1 is connected between trigger and cathode of thyristor Th1.

    Dans ce circuit, dès que l'interrupteur P est fermé, le condensateur C se charge avec une constante de temps déterminée par la valeur de la résistance R. Quand la tension aux bornes du condensateur C dépasse la valeur de la tension d'avalanche de la diode Zener Z (choisie légèrement inférieure à E), le thyristor Th1 entre en conduction et un courant circule dans la boucle oscillante comprenant le condensateur C et le solénoïde S. Dès que ce courant passe par zéro, le thyristor Th1 s'ouvre automatiquement et le cycle se répète tant que le bouton poussoir P reste fermé. Un avantage de ce mode de réalisation réside dans le fait que le thyristor Th1 assure la double fonction de commutateur et de détecteur de passage à zéro.In this circuit, as soon as the switch P is closed, the capacitor C charges with a determined time constant by the value of resistance R. When the voltage across the capacitor C exceeds the value of the avalanche voltage of the Zener Z diode (chosen slightly lower than E), the thyristor Th1 goes into conduction and a current flows in the loop oscillating including capacitor C and solenoid S. From as this current passes through zero, thyristor Th1 opens automatically and the cycle is repeated as long as the push button P remains closed. An advantage of this embodiment lies in the fact that thyristor Th1 performs the double function of switch and zero crossing detector.

    La figure 4 illustre l'allure de divers courant et tensions du circuit de la figure 3. On désigne par A la première borne du condensateur, par B la première borne du solénoïde et par M le point commun des deuxièmes bornes du commutateur et du solénoïde. Ainsi, la figure 4 représente plus particulièrement les tensions VAM, VBM et le courant IS dans le solénoïde. Cette figure a été tracée pour :

  • R = 6,2 ohms,
  • R1 = 300 ohms,
  • E = 12 volts,
  • C = 330 microfarads,
  • L = 0,6 millihenry,
    • la diode Zener Z ayant une tension d'avalanche sensiblement égale à 9 volts.FIG. 4 illustrates the shape of various currents and voltages of the circuit of FIG. 3. Designate by A the first terminal of the capacitor, by B the first terminal of the solenoid and by M the common point of the second terminals of the switch and of the solenoid . Thus, FIG. 4 more particularly represents the voltages V AM , V BM and the current I S in the solenoid. This figure has been drawn for:
  • R = 6.2 ohms,
  • R1 = 300 ohms,
  • E = 12 volts,
  • C = 330 microfarads,
  • L = 0.6 millihenry,
    • the Zener Z diode having an avalanche voltage substantially equal to 9 volts.

    Comme le montre la figure 4, la tension VAM aux bornes du condensateur C croít jusqu'à 9 volts en environ 3 millisecondes. A ce moment là, la tension VBM aux bornes du solénoïde croít brutalement et le courant IS dans celui-ci passe par des phases successives de croissance puis de décroissance pour atteindre une valeur nulle au bout de sensiblement 2 millisecondes. Le cycle se répète ensuite périodiquement.As shown in Figure 4, the voltage VAM across the capacitor C increases to 9 volts in about 3 milliseconds. At this time, the voltage V BM at the terminals of the solenoid increases abruptly and the current I S in it passes through successive phases of growth then of decay to reach a zero value after approximately 2 milliseconds. The cycle is then repeated periodically.

    Bien entendu, la présente invention est susceptible de diverses variantes et modifications qui apparaítront à l'homme de l'art. Notamment, le cycle de fonctionnement du vibreur pourra être modifié en modifiant la valeur de la résistance R et les valeurs relatives de la capacité du condensateur et de l'inductance du solénoïde pour obtenir une tonalité souhaitée. De plus, dans le mode de réalisation de la figure 3, tout dispositif à seuil autre qu'une simple diode Zener pourrait être utilisé.Of course, the present invention is capable of various variants and modifications which will appear to the man of art. In particular, the vibrator's operating cycle may be modified by modifying the value of resistance R and the relative values of the capacitor and the inductance of the solenoid to obtain a desired tone. Of more, in the embodiment of Figure 3, any device with a threshold other than a simple Zener diode could be used.

    Claims (3)

    Circu.it de commande d'une membrane vibrante (M) excitée par un solénoïde (S) en série avec une alimentation continue (E) et un commutateur commandé (SW), caractérisé en ce qu'il comprend : un condensateur (C) disposé aux bornes d'un circuit série comprenant le solénoïde (S) et le commutateur (SW) ; et des moyens pour ouvrir le commutateur (SW) au voisinage d'un passage à zéro du courant dans l'inductance. Control circuit for a vibrating membrane (M) excited by a solenoid (S) in series with a continuous supply (E) and a controlled switch (SW), characterized in that it comprises: a capacitor (C) disposed across a series circuit comprising the solenoid (S) and the switch (SW); and means for opening the switch (SW) in the vicinity of a zero crossing of the current in the inductor. Circuit de commande selon la revendication 1, caractérisé en ce que le commutateur commandé est constitué d'un thyristor disposé entre la première borne (A) du condensateur et la première borne (B) du solénoïde, la gâchette du thyristor étant connectée à ladite première borne du condensateur (C) par une diode Zener (Z) et la gâchette du thyristor étant connectée à sa cathode par l'intermédiaire d'une résistance (R1), ledit thyristor constituant intrinsèquement le moyen d'ouverture au voisinage d'un passage à zéro du courant.Control circuit according to claim 1, characterized in that the controlled switch consists of a thyristor arranged between the first terminal (A) of the capacitor and the first terminal (B) of the solenoid, the trigger of the thyristor being connected to said first terminal of the capacitor (C) by a Zener diode (Z) and the thyristor trigger being connected to its cathode via a resistor (R1), said thyristor intrinsically constituting the means of opening to neighborhood of a zero crossing of the current. Circuit selon l'une des revendications 1 ou 2, caractérisé en ce qu'il comprend en outre une résistance (R) en série entre l'alimentation et le condensateur pour fixer la constante de temps de charge de celui-ci.Circuit according to one of claims 1 or 2, characterized in that it further comprises a resistance (R) in series between the power supply and the capacitor to fix the charging time constant of it.
    EP98410052A 1997-05-22 1998-05-18 Control circuit for a vibrating membrane Expired - Lifetime EP0881623B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR9706497 1997-05-22
    FR9706497A FR2763777B1 (en) 1997-05-22 1997-05-22 CONTROL CIRCUIT FOR A VIBRATING MEMBRANE

    Publications (2)

    Publication Number Publication Date
    EP0881623A1 true EP0881623A1 (en) 1998-12-02
    EP0881623B1 EP0881623B1 (en) 2003-04-23

    Family

    ID=9507298

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP98410052A Expired - Lifetime EP0881623B1 (en) 1997-05-22 1998-05-18 Control circuit for a vibrating membrane

    Country Status (4)

    Country Link
    US (1) US6380847B1 (en)
    EP (1) EP0881623B1 (en)
    DE (1) DE69813670D1 (en)
    FR (1) FR2763777B1 (en)

    Families Citing this family (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE10104590C1 (en) * 2001-02-01 2002-08-08 Infineon Technologies Ag Acoustic signal generating device and method for generating an acoustic signal
    JP2010152329A (en) * 2008-12-25 2010-07-08 Sung Il Industrial Co Ltd Electronic disk-type horn and horn using photointerrupter
    CN104972966A (en) * 2014-04-11 2015-10-14 万喻 Method for solving problem of EMC electromagnetic interference of horn of motor vehicle or ship and horn
    CN105096929A (en) * 2014-04-30 2015-11-25 鸿富锦精密工业(武汉)有限公司 Buzzer circuit

    Citations (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US4136337A (en) * 1977-10-27 1979-01-23 General Signal Corporation Buzzer assembly
    EP0237727A2 (en) * 1986-03-15 1987-09-23 Hella KG Hueck & Co. Electromagnetic signal horn
    US5457437A (en) * 1991-06-08 1995-10-10 Mando Machinery Corporation Sparking free circuit of electric horn

    Family Cites Families (6)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US3283299A (en) * 1964-06-04 1966-11-01 Henry C Savino Motor vehicle signal device
    US3582687A (en) * 1969-07-15 1971-06-01 Massachusetts Inst Technology Monostable and astable multivibrator apparatus including differential amplifier, rc network and switch means for initiating and terminating output pulses
    DE7021446U (en) * 1970-06-08 1971-02-25 Junghans Gmbh Geb ELECTRIC BELL FOR ALARM CLOCKS.
    US4598049A (en) * 1983-08-31 1986-07-01 Systec Inc. General purpose gene synthesizer
    US4747351A (en) * 1985-12-18 1988-05-31 Baret David B Solid-state whistle and horn activation system for model railroads
    DE3638761A1 (en) 1986-11-13 1988-05-26 Schering Ag IMPROVED KETOR REDUCTION OF CARBACYCLINE INTERMEDIATE PRODUCTS

    Patent Citations (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US4136337A (en) * 1977-10-27 1979-01-23 General Signal Corporation Buzzer assembly
    EP0237727A2 (en) * 1986-03-15 1987-09-23 Hella KG Hueck & Co. Electromagnetic signal horn
    US5457437A (en) * 1991-06-08 1995-10-10 Mando Machinery Corporation Sparking free circuit of electric horn

    Also Published As

    Publication number Publication date
    DE69813670D1 (en) 2003-05-28
    FR2763777A1 (en) 1998-11-27
    EP0881623B1 (en) 2003-04-23
    US6380847B1 (en) 2002-04-30
    FR2763777B1 (en) 1999-08-13

    Similar Documents

    Publication Publication Date Title
    FR2489885A1 (en) EXCITATION CIRCUIT FOR FUEL INJECTOR
    FR2646459A1 (en) MOTORIZED WINDOW OR DOOR OPENING / CLOSING CONTROL SYSTEM
    FR2811825A1 (en) AC GENERATOR FOR VEHICLE COMPRISING A VOLTAGE CONTROL UNIT
    EP0240434A1 (en) Protection circuit for a switching power supply
    EP0008835A1 (en) Electrical circuit for igniting a detonator
    FR2814605A1 (en) VEHICLE AC VOLTAGE GENERATOR VOLTAGE REGULATION SYSTEM
    EP0338926A1 (en) Elevated tension electric power supply for feeding the auxiliary circuit of a motor vehicle
    EP0881623B1 (en) Control circuit for a vibrating membrane
    FR2551217A1 (en) AC current flow detector
    EP0562908A1 (en) Supply circuit for an electromagnetic relay
    FR2532487A1 (en) REGULATOR FOR BATTERY CHARGING BY PERMANENT MAGNET ALTERNATOR
    FR2520890A1 (en) DEVICE FOR CONTROLLING THE CLUTCH SPEED OF AN ELECTROMAGNETIC CLUTCH
    FR2819353A1 (en) REGULATOR AND METHOD FOR PRODUCING ENERGY FOR A VEHICLE
    FR2828668A1 (en) SEAT BELT RETRACTOR
    FR2533032A1 (en) CURRENT SENSOR DEVICE
    EP0712059B1 (en) Circuit for driving a piezo-electric vibrator
    EP0021867B1 (en) Supply means comprising a chopper, regulated against variations of input voltage and output power, particularly for a television receiver
    EP0064450B1 (en) Self adjusting method and apparatus for actuating a triac
    EP0536058B2 (en) Electronic trip device comprising local detected fault type indicating means
    CH682019A5 (en) Amplitude control circuit for oscillator circuit - includes current sources and current mirror in circuit to limit final output voltage of oscillator control circuit
    FR2865885A1 (en) PROTECTIVE DEVICE FOR DECOUPING POWER SUPPLY AND LIGHTING DEVICE FOR VEHICLE.
    EP0280631B1 (en) Motor vehicle ignition device
    FR2532422A1 (en) PHOTOMETRIC CIRCUIT IN A PHOTOGRAPHIC LIGHTING DEVICE
    EP0785703B1 (en) Control device for a low pressure fluorescent lamp
    FR2468940A1 (en) Voltage regulator for alternator charging vehicle battery - maintains min. voltage through energising winding allowing operation of failure light

    Legal Events

    Date Code Title Description
    PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

    Free format text: ORIGINAL CODE: 0009012

    AK Designated contracting states

    Kind code of ref document: A1

    Designated state(s): DE FR GB IT

    AX Request for extension of the european patent

    Free format text: AL;LT;LV;MK;RO;SI

    RAP3 Party data changed (applicant data changed or rights of an application transferred)

    Owner name: STMICROELECTRONICS S.A.

    17P Request for examination filed

    Effective date: 19990525

    AKX Designation fees paid

    Free format text: DE FR GB IT

    RAP1 Party data changed (applicant data changed or rights of an application transferred)

    Owner name: STMICROELECTRONICS S.A.

    GRAG Despatch of communication of intention to grant

    Free format text: ORIGINAL CODE: EPIDOS AGRA

    17Q First examination report despatched

    Effective date: 20020628

    GRAG Despatch of communication of intention to grant

    Free format text: ORIGINAL CODE: EPIDOS AGRA

    GRAH Despatch of communication of intention to grant a patent

    Free format text: ORIGINAL CODE: EPIDOS IGRA

    GRAH Despatch of communication of intention to grant a patent

    Free format text: ORIGINAL CODE: EPIDOS IGRA

    GRAA (expected) grant

    Free format text: ORIGINAL CODE: 0009210

    AK Designated contracting states

    Designated state(s): DE FR GB IT

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: IT

    Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

    Effective date: 20030423

    REG Reference to a national code

    Ref country code: GB

    Ref legal event code: FG4D

    Free format text: NOT ENGLISH

    REF Corresponds to:

    Ref document number: 69813670

    Country of ref document: DE

    Date of ref document: 20030528

    Kind code of ref document: P

    GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: DE

    Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

    Effective date: 20030724

    PLBE No opposition filed within time limit

    Free format text: ORIGINAL CODE: 0009261

    STAA Information on the status of an ep patent application or granted ep patent

    Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

    26N No opposition filed

    Effective date: 20040126

    PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

    Ref country code: FR

    Payment date: 20060515

    Year of fee payment: 9

    PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

    Ref country code: GB

    Payment date: 20060517

    Year of fee payment: 9

    GBPC Gb: european patent ceased through non-payment of renewal fee

    Effective date: 20070518

    REG Reference to a national code

    Ref country code: FR

    Ref legal event code: ST

    Effective date: 20080131

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: GB

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20070518

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: FR

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20070531