EP0712059A1 - Command circuit for piezo-electric vibrator - Google Patents

Command circuit for piezo-electric vibrator Download PDF

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Publication number
EP0712059A1
EP0712059A1 EP95117055A EP95117055A EP0712059A1 EP 0712059 A1 EP0712059 A1 EP 0712059A1 EP 95117055 A EP95117055 A EP 95117055A EP 95117055 A EP95117055 A EP 95117055A EP 0712059 A1 EP0712059 A1 EP 0712059A1
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EP
European Patent Office
Prior art keywords
switching means
vibrator
transistor
series
connection
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Granted
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EP95117055A
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German (de)
French (fr)
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EP0712059B1 (en
Inventor
Soltermann Bertrand
Jabbour Saji
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Swatch Group Management Services AG
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SMH Management Services AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/0207—Driving circuits
    • B06B1/0223—Driving circuits for generating signals continuous in time
    • B06B1/0238—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G13/00—Producing acoustic time signals
    • G04G13/02—Producing acoustic time signals at preselected times, e.g. alarm clocks
    • G04G13/021—Details

Definitions

  • the present invention relates to a control circuit for a piezoelectric vibrator.
  • a vibrator is intended in particular to equip an electronic watch with an acoustic alarm device.
  • Control circuits for a piezoelectric vibrator are already known, for example thanks to American patent US-A-4 232 241.
  • This document describes such a circuit which comprises a branch comprising a coil and a diode connected in series, and a piezoelectric vibrator connected in parallel with the branch thus forming a parallel circuit.
  • One side of this parallel circuit is connected to a power source, while the other side of this parallel circuit is connected to a transistor, also connected to the source.
  • a current flows through the branch and the transistor, and the coil stores the corresponding electromagnetic energy.
  • the transistor is put in the blocking state, the current flows in the parallel circuit, and the induced voltage in the coil is then applied to the terminals of the vibrator in order to excite the latter.
  • the noise level that can be reached with such a circuit is limited, which constitutes a disadvantage for applications to acoustic alarms.
  • the amount of energy that the coil can store is a function of its volume, that is to say of its number of turns and the diameter of the wire which constitutes it.
  • this circuit should not be too large.
  • the aim of the present invention is to provide a solution to these problems by presenting a circuit for control of a piezoelectric vibrator which is simple to build, which does not cost much, and which makes it possible to reach a very high sound level, without the dimensions of this circuit becoming too large, so that it can be incorporated in a watch for example.
  • the solution recommended by the invention consists in supplying a piezoelectric vibrator by two supply channels, each comprising a coil.
  • the vibrator can be kept under tension continuously and it is excited in a maximum way.
  • the vibrator is excited in both directions relative to its rest position and therefore it has a greater displacement than the vibrator of the prior art. It is therefore understood that, even if the efficiency of this circuit is reduced, the sound level will be higher compared to the circuits of the prior art.
  • Figure 1 schematically shows a control circuit of a piezoelectric vibrator according to the invention.
  • the circuit includes a supply voltage source 1, for example a 3-volt source, supplying two electrical branches.
  • Each branch has a series connection of a coil 2, 2 'and a diode 3, 3 ', this connection being connected by means of a first terminal A, A' at the high voltage level of the source 1.
  • A first terminal
  • A' at the high voltage level of the source 1.
  • Each connection is also connected, via a second terminal B, B ', to switching means, for example transistors T1, T2.
  • Each transistor T1, T2 is connected by its transmitter to the low voltage level of the source 1 so that a current can flow in each branch when a transistor is in the conducting state.
  • the position of the series connection and of the transistor can be reversed.
  • the common terminal of the transistors will be the terminal connected to the high voltage level instead of the terminal which is connected to the low voltage level of the source 1 in the example given.
  • a piezoelectric vibrator 4 such as a piezoelectric membrane is connected between the two terminals B, B '.
  • Each transistor T1, T2 is controlled respectively by a periodic control signal S1 and S2 applied to its base.
  • the signal S2 is phase shifted with respect to the signal S1, for example by 180 °, so that when the transistor T1 is put in conductive state by the control signal S1, the other transistor T2 is maintained in a blocking state by the control signal S2.
  • the control signals S1, S2 are for example pulse signals, each side of which changes the state of the transistors T1 and T2 respectively.
  • the transistor T2 When the transistor T2 is placed in the conducting state, the transistor T1 is put in the blocking state, and an electric current flows through the coil 2 ′ and the diode 3 ′ from the DC voltage source 1 passing through the transistor T2, the coil 2 'thus storing the corresponding energy.
  • the transistor T1 When the transistor T1 goes to the conductive state thanks to its control signal S1, the transistor T2 therefore goes to the blocking state under the action of its control signal S2, out of phase with the signal S1.
  • the voltage induced in the coil 2 ' will then be applied to the terminals of the vibrator 4 to excite it.
  • a current flows through the coil 2 and the diode 3 from the DC voltage source 1 by the transistor T1, and the coil 2 then stores the corresponding energy.
  • the vibrator 4 is therefore kept under tension continuously by the voltage induced either by the coil 2 or by the coil 2 '. If the frequency of the changes in the voltage applied to the vibrator 4 corresponds to the resonant frequency of the vibrator, the latter will be excited to the maximum.
  • FIG. 2 schematically represents this excitation of the vibrator 4.
  • the voltage applied by the coil 2 excites the vibrator 4 in a first direction relative to its rest position, for example, in the upward direction indicated by the dotted line at the Figure 2.
  • the voltage applied by the coil 2 ' will excite the vibrator 4 then in the other direction, for example downwards as also shown in Figure 2, at the time of the change of state of the transistors T1, T2 as this has was explained above.
  • the vibrator 4 is therefore attacked alternately and vibrates in both directions, in a manner comparable to the diaphragm of a loudspeaker, and its displacement d is greater than if it were only excited in one direction.
  • control circuit according to the invention makes it possible to obtain a two-tone alarm, similar to a police alarm, by the use of the control signals S1 and S2 which have slightly different frequencies.
  • control signals S1 and S2 which have slightly different frequencies.
  • the control circuit of the invention can then advantageously be used in a wristwatch with an alarm device.
  • the circuit according to the invention makes it possible to reach, with a clock battery, a sound level of the order of 110 dB at 10 cm, which obviously depends on the size of the piezoelectric vibrator and the cavity in which it is placed. .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Electromechanical Clocks (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Electric Clocks (AREA)
  • Electronic Switches (AREA)

Abstract

A source of electrical potential (1) is connected to two parallel circuits. Each circuit comprises an inductor coil (2, 2'), a diode (3, 3') and a switching transistor (T1, T2). A piezoelectric buzzer (4) is connected between the two diode to transistor junctions (B, B'). The two switching transistors (T1, T2) are supplied with signals (S1, S2) which make them alternately conduct and block. When one transistor (T2) conducts and the other (T1) blocks, energy is stored in the corresponding inductor (2') which is then applied to the buzzer as the transistor switching is reversed by the signals (S1, S2).

Description

La présente invention concerne un circuit de commande d'un vibreur piézo-électrique. Un tel vibreur est destiné notamment à équiper une montre électronique à dispositif d'alarme acoustique.The present invention relates to a control circuit for a piezoelectric vibrator. Such a vibrator is intended in particular to equip an electronic watch with an acoustic alarm device.

On connaît déjà des circuits de commande d'un vibreur piézo-électrique, par exemple grâce au brevet américain US-A-4 232 241. Ce document décrit un tel circuit qui comprend une branche comportant une bobine et une diode connectées en série, et un vibreur piézo-électrique connecté en parallèle avec la branche formant ainsi un circuit parallèle. Un côté de ce circuit parallèle est connecté à une source d'alimentation, tandis que l'autre coté de ce circuit parallèle est connecté à un transistor, connecté lui aussi à la source. Pendant que le transistor est à l'état conducteur, un courant circule à travers la branche et le transistor, et la bobine emmagasine l'énergie électromagnétique correspondante. Quand le transistor est mis à l'état de blocage, le courant circule dans le circuit parallèle, et la tension induite dans la bobine est alors appliquée aux bornes du vibreur afin d'exciter ce dernier.Control circuits for a piezoelectric vibrator are already known, for example thanks to American patent US-A-4 232 241. This document describes such a circuit which comprises a branch comprising a coil and a diode connected in series, and a piezoelectric vibrator connected in parallel with the branch thus forming a parallel circuit. One side of this parallel circuit is connected to a power source, while the other side of this parallel circuit is connected to a transistor, also connected to the source. While the transistor is in the conductive state, a current flows through the branch and the transistor, and the coil stores the corresponding electromagnetic energy. When the transistor is put in the blocking state, the current flows in the parallel circuit, and the induced voltage in the coil is then applied to the terminals of the vibrator in order to excite the latter.

Toutefois, le niveau sonore pouvant être atteint avec un tel circuit est limité, ce qui constitue un désavantage pour les applications à des alarmes acoustiques. En effet, la quantité d'énergie que la bobine peut emmagasiner est fonction de son volume, c'est-à-dire de son nombre de spires et du diamètre du fil qui la constitue. Comme l'on souhaite incorporer le circuit de commande dans une montre par exemple, on comprend que ce circuit ne doit pas être trop grand.However, the noise level that can be reached with such a circuit is limited, which constitutes a disadvantage for applications to acoustic alarms. Indeed, the amount of energy that the coil can store is a function of its volume, that is to say of its number of turns and the diameter of the wire which constitutes it. As we wish to incorporate the control circuit in a watch for example, we understand that this circuit should not be too large.

Le but de la présente invention est d'apporter une solution à ces problèmes en présentant un circuit de commande d'un vibreur piézo-électrique qui est simple de construction, qui ne coûte pas cher, et qui permet d'atteindre un niveau sonore très élevé, sans que les dimensions de ce circuit deviennent trop grandes, pour qu'il puisse être incorporé dans une montre par exemple.The aim of the present invention is to provide a solution to these problems by presenting a circuit for control of a piezoelectric vibrator which is simple to build, which does not cost much, and which makes it possible to reach a very high sound level, without the dimensions of this circuit becoming too large, so that it can be incorporated in a watch for example.

Ce but est atteint grâce aux caractéristiques particulières que présente le circuit de commande de la revendication 1.This object is achieved thanks to the particular characteristics presented by the control circuit of claim 1.

La solution préconisée par l'invention consiste à alimenter un vibreur piézo-électrique par deux voies d'alimentation, chacune comprenant une bobine. Ainsi, le vibreur peut être maintenu sous tension continuellement et il est excité d'une façon maximale. En effet, le vibreur est excité dans les deux sens par rapport à sa position de repos et il a donc un déplacement plus grand que le vibreur de l'art antérieur. On comprend donc que, même si le rendement de ce circuit est diminué, le niveau sonore sera plus élevé par rapport aux circuits de l'art antérieur.The solution recommended by the invention consists in supplying a piezoelectric vibrator by two supply channels, each comprising a coil. Thus, the vibrator can be kept under tension continuously and it is excited in a maximum way. Indeed, the vibrator is excited in both directions relative to its rest position and therefore it has a greater displacement than the vibrator of the prior art. It is therefore understood that, even if the efficiency of this circuit is reduced, the sound level will be higher compared to the circuits of the prior art.

D'autres caractéristiques et avantages de l'invention apparaîtront mieux à la lecture de la description détaillée qui suit, et qui sera faite en se référant aux dessins annexés, donnés à titre d'exemple uniquement, dans lesquels :

  • la figure 1 représente schématiquement un circuit de commande d'un vibreur piézo-électrique selon l'invention, et
  • la figure 2 représente schématiquement l'excitation du vibreur piézo-électrique par le circuit de la figure 1.
Other characteristics and advantages of the invention will appear better on reading the detailed description which follows, which will be made with reference to the appended drawings, given by way of example only, in which:
  • FIG. 1 schematically represents a control circuit for a piezoelectric vibrator according to the invention, and
  • FIG. 2 schematically represents the excitation of the piezoelectric vibrator by the circuit of FIG. 1.

La figure 1 représente schématiquement un circuit de commande d'un vibreur piézo-électrique selon l'invention.Figure 1 schematically shows a control circuit of a piezoelectric vibrator according to the invention.

Le circuit comprend une source de tension d'alimentation 1, par exemple une source de 3 volts, alimentant deux branches électriques. Chaque branche comporte un raccordement en série d'une bobine 2, 2' et d'une diode 3, 3', ce raccordement étant connecté au moyen d'une première borne A, A' au niveau de tension haut de la source 1. Bien entendu, la position de la bobine 2 respectivement 2' et de la diode 3 respectivement 3', peut être inversée. Chaque raccordement est en outre connecté, par l'intermédiaire d'une deuxième borne B, B', à des moyens commutateurs, par exemple des transistors T1, T2. Chaque transistor T1, T2 est connecté par son émetteur au niveau de tension bas de la source 1 de sorte qu'un courant peut circuler dans chaque branche quand un transistor est à l'état conducteur. Bien entendu, ici aussi, la position du raccordement série et du transistor peut être inversée. Dans ce cas, la borne commune des transistors sera la borne reliée au niveau de tension haut au lieu de la borne qui est reliée au niveau de tension bas de la source 1 dans l'exemple donné. Un vibreur piézo-électrique 4 tel qu'une membrane piézo-électrique est connecté entre les deux bornes B, B'.The circuit includes a supply voltage source 1, for example a 3-volt source, supplying two electrical branches. Each branch has a series connection of a coil 2, 2 'and a diode 3, 3 ', this connection being connected by means of a first terminal A, A' at the high voltage level of the source 1. Of course, the position of the coil 2 respectively 2 'and of the diode 3 respectively 3 ', can be reversed. Each connection is also connected, via a second terminal B, B ', to switching means, for example transistors T1, T2. Each transistor T1, T2 is connected by its transmitter to the low voltage level of the source 1 so that a current can flow in each branch when a transistor is in the conducting state. Of course, here too, the position of the series connection and of the transistor can be reversed. In this case, the common terminal of the transistors will be the terminal connected to the high voltage level instead of the terminal which is connected to the low voltage level of the source 1 in the example given. A piezoelectric vibrator 4 such as a piezoelectric membrane is connected between the two terminals B, B '.

Chaque transistor T1, T2 est commandé respectivement par un signal périodique de commande S1 et S2 appliqué à sa base. Le signal S2 est déphasé par rapport au signal S1, par exemple de 180°, de sorte que quand le transistor T1 est mis en état conducteur par le signal de commande S1, l'autre transistor T2 est maintenu dans un état de blocage par le signal de commande S2.Each transistor T1, T2 is controlled respectively by a periodic control signal S1 and S2 applied to its base. The signal S2 is phase shifted with respect to the signal S1, for example by 180 °, so that when the transistor T1 is put in conductive state by the control signal S1, the other transistor T2 is maintained in a blocking state by the control signal S2.

Les signaux de commande S1, S2 sont par exemple des signaux d'impulsions, dont chaque flanc change l'état des transistors T1 et T2 respectivement. Lorsque le transistor T2 est mis en état conducteur, le transistor T1 est mis en état de blocage, et un courant électrique circule à travers la bobine 2' et la diode 3' depuis la source de tension continue 1 en passant par le transistor T2, la bobine 2' emmagasinant ainsi l'énergie correspondante.The control signals S1, S2 are for example pulse signals, each side of which changes the state of the transistors T1 and T2 respectively. When the transistor T2 is placed in the conducting state, the transistor T1 is put in the blocking state, and an electric current flows through the coil 2 ′ and the diode 3 ′ from the DC voltage source 1 passing through the transistor T2, the coil 2 'thus storing the corresponding energy.

Au moment où le transistor T1 passe à l'état conducteur grâce à son signal de commande S1, le transistor T2 passe donc à l'état de blocage sous l'action de son signal de commande S2, déphasé par rapport au signal S1. La tension induite dans la bobine 2' sera alors appliquée aux bornes du vibreur 4 pour l'exciter. D'autre part, un courant circule à travers la bobine 2 et la diode 3 depuis la source de tension continue 1 par le transistor T1, et la bobine 2 emmagasine alors l'énergie correspondante.When the transistor T1 goes to the conductive state thanks to its control signal S1, the transistor T2 therefore goes to the blocking state under the action of its control signal S2, out of phase with the signal S1. The voltage induced in the coil 2 'will then be applied to the terminals of the vibrator 4 to excite it. On the other hand, a current flows through the coil 2 and the diode 3 from the DC voltage source 1 by the transistor T1, and the coil 2 then stores the corresponding energy.

Le vibreur 4 est donc maintenu sous tension continuellement par la tension induite soit par la bobine 2, soit par la bobine 2'. Si la fréquence des changements de la tension appliquée au vibreur 4 correspond à la fréquence de résonance du vibreur, celui-ci sera excité d'une façon maximale.The vibrator 4 is therefore kept under tension continuously by the voltage induced either by the coil 2 or by the coil 2 '. If the frequency of the changes in the voltage applied to the vibrator 4 corresponds to the resonant frequency of the vibrator, the latter will be excited to the maximum.

La figure 2 représente schématiquement cette excitation du vibreur 4. La tension appliquée par la bobine 2 excite le vibreur 4 dans un premier sens par rapport à sa position de repos, par exemple, dans le sens vers le haut indiqué par la ligne pointillée à la figure 2. La tension appliquée par la bobine 2' excitera le vibreur 4 alors dans l'autre sens, par exemple vers le bas comme également indiqué à la figure 2, au moment du changement d'état des transistors T1, T2 comme cela a été expliqué ci-dessus. Le vibreur 4 est donc attaqué en alternance et vibre dans les deux sens, de façon comparable à la membrane d'un haut parleur, et son déplacement d est plus grand que s'il n'était excité que dans un seul sens.FIG. 2 schematically represents this excitation of the vibrator 4. The voltage applied by the coil 2 excites the vibrator 4 in a first direction relative to its rest position, for example, in the upward direction indicated by the dotted line at the Figure 2. The voltage applied by the coil 2 'will excite the vibrator 4 then in the other direction, for example downwards as also shown in Figure 2, at the time of the change of state of the transistors T1, T2 as this has was explained above. The vibrator 4 is therefore attacked alternately and vibrates in both directions, in a manner comparable to the diaphragm of a loudspeaker, and its displacement d is greater than if it were only excited in one direction.

Avantageusement, le circuit de commande selon l'invention permet d'obtenir une alarme à deux tons, semblable à une alarme de police, par l'utilisation des signaux de commande S1 et S2 qui ont des fréquences légèrement différentes. Bien entendu, il est également possible d'obtenir une alarme à quatre tons avec le circuit de l'invention par l'utilisation d'un balayage de fréquences des signaux de commande d'une façon connue de l'homme de métier.Advantageously, the control circuit according to the invention makes it possible to obtain a two-tone alarm, similar to a police alarm, by the use of the control signals S1 and S2 which have slightly different frequencies. Of course, it is also possible to obtain a four-tone alarm with the circuit of the invention by using a frequency sweep of the control signals in a manner known to those skilled in the art.

Ainsi, on obtient un circuit pouvant atteindre un niveau sonore plus élevé que les circuits connus de l'art antérieur, sans que le circuit devienne beaucoup plus grand.Thus, a circuit can be obtained which can reach a higher sound level than the circuits known in the art. earlier, without the circuit becoming much larger.

Le circuit de commande de l'invention peut alors avantageusement être utilisé dans une montre-bracelet à dispositif d'alarme. Le circuit selon l'invention permet d'atteindre, avec une pile horlogère, un niveau sonore de l'ordre de 110 dB à 10 cm, qui dépend évidemment de la grandeur du vibreur piézo-électrique et de la cavité dans laquelle il est placé.The control circuit of the invention can then advantageously be used in a wristwatch with an alarm device. The circuit according to the invention makes it possible to reach, with a clock battery, a sound level of the order of 110 dB at 10 cm, which obviously depends on the size of the piezoelectric vibrator and the cavity in which it is placed. .

Claims (4)

Circuit de commande d'un vibreur piézo-électrique comprenant : - une première branche comportant : - des premiers moyens commutateurs (T1) pouvant être mis en état de blocage et en état conducteur à la réception d'un premier signal périodique de commande (S1), et - un premier raccordement en série d'une bobine (2) et d'une diode (3), une première borne (A) dudit premier raccordement en série étant connectée à une source de tension d'alimentation (1) et une deuxième borne (B) dudit premier raccordement étant connectée auxdits premiers moyens commutateurs (T1), caractérisé en ce qu'il comprend en outre - une deuxième branche comportant : - des deuxièmes moyens commutateurs (T2) pouvant être mis en état de blocage et en état conducteur à la réception d'un deuxième signal périodique de commande (S2), et - un deuxième raccordement en série d'une bobine (2') et d'une diode (3'), une première borne (A') dudit deuxième raccordement en série étant connectée à ladite source de tension d'alimentation (1) et une deuxième borne (B') dudit deuxième raccordement étant connectée auxdits deuxièmes moyens commutateurs (T2),
ledit vibreur (4) étant connecté entre lesdites deuxièmes bornes (B, B') de façon que lorsque lesdits premiers moyens commutateurs (T1) sont à l'état de blocage, lesdits deuxièmes moyens commutateurs (T2) sont à l'état conducteur et connectés électriquement en série avec ledit vibreur (4) et ledit premier raccordement en série (2,3), tandis que lorsque lesdits deuxièmes moyens commutateurs (T2) sont à l'état de blocage, lesdits premiers moyens commutateurs (T1) sont à l'état conducteur et connectés électriquement en série avec ledit vibreur (4) et ledit deuxième raccordement en série (2',3'). Control circuit of a piezoelectric vibrator comprising: - a first branch comprising: first switching means (T1) which can be put in blocking state and in conducting state on reception of a first periodic control signal (S1), and - a first series connection of a coil (2) and a diode (3), a first terminal (A) of said first series connection being connected to a supply voltage source (1) and a second terminal (B) of said first connection being connected to said first switching means (T1), characterized in that it further comprises - a second branch comprising: - second switching means (T2) which can be put in blocking state and in conducting state on reception of a second periodic control signal (S2), and a second series connection of a coil (2 ') and a diode (3'), a first terminal (A ') of said second series connection being connected to said supply voltage source (1) and a second terminal (B ') of said second connection being connected to said second switching means (T2),
said vibrator (4) being connected between said second terminals (B, B ') so that when said first switching means (T1) are in the blocking state, said second switching means (T2) are in the conducting state and electrically connected in series with said vibrator (4) and said first connection in series (2,3), while when said second switching means (T2) are in the blocked state, said first switching means (T1) are at driver and connected state electrically in series with said vibrator (4) and said second connection in series (2 ', 3'). Circuit selon la revendication 1, caractérisé en ce que lesdits moyens commutateurs comportent chacun un transistor ayant chacun une base à laquelle est appliqué un desdits premier et deuxième signaux de commande (S1, S2), et un chemin collecteur-émetteur connecté auxdites deuxièmes bornes (B, B').Circuit according to Claim 1, characterized in that the said switching means each comprise a transistor each having a base to which one of the said first and second control signals (S1, S2) is applied, and a collector-emitter path connected to the said second terminals ( B, B '). Circuit selon la revendication 1 ou 2, caractérisé en ce que ledit deuxième signal de commande (S2) est déphasé de 180° par rapport audit premier signal de commande (S1).Circuit according to claim 1 or 2, characterized in that said second control signal (S2) is 180 ° out of phase with respect to said first control signal (S1). Montre à dispositif d'alarme acoustique, caractérisée en ce qu'elle comprend un circuit de commande selon la revendication 1, 2 ou 3.Watch with acoustic alarm device, characterized in that it comprises a control circuit according to claim 1, 2 or 3.
EP95117055A 1994-11-08 1995-10-30 Circuit for driving a piezo-electric vibrator Expired - Lifetime EP0712059B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH03333/94A CH687115B5 (en) 1994-11-08 1994-11-08 Control circuit for a piezoelectric vibrator.
CH3333/94 1994-11-08

Publications (2)

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EP0712059A1 true EP0712059A1 (en) 1996-05-15
EP0712059B1 EP0712059B1 (en) 1998-06-17

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US (1) US5635788A (en)
EP (1) EP0712059B1 (en)
JP (1) JPH08233957A (en)
CN (1) CN1084001C (en)
AT (1) ATE167581T1 (en)
AU (1) AU694567B2 (en)
CH (1) CH687115B5 (en)
DE (1) DE69503021T2 (en)
HK (1) HK1012168A1 (en)
SG (1) SG45119A1 (en)
TW (1) TW371729B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19644521A1 (en) * 1996-10-25 1998-04-30 Siemens Ag Method and device for controlling a capacitive actuator
DE19825210C2 (en) * 1998-04-23 2003-09-25 Gsg Elektronik Gmbh Circuit arrangement for dynamic control of ceramic solid state actuators
JP5865029B2 (en) * 2011-11-18 2016-02-17 矢崎エナジーシステム株式会社 Alarm
CN102836811A (en) * 2012-07-30 2012-12-26 西安思坦仪器股份有限公司 Stimulating method and stimulating circuit for piezoelectric ceramic transducer
JP6308788B2 (en) * 2013-03-27 2018-04-11 セイコーインスツル株式会社 Electronic device and impact detection method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2279254A1 (en) * 1974-07-16 1976-02-13 Gaboriaud Paul High frequency thyristor generator for ultrasonic atomiser - has thyristor triggered from subharmonic of crystal oscillator
US4232241A (en) 1977-05-26 1980-11-04 Kabushiki Kaisha Seikosha Electric circuit for driving a piezoelectric vibrator
DE3230218A1 (en) * 1982-08-13 1984-02-23 Braun Ag, 6000 Frankfurt Electronic clock or clock radio with an alarm signal of differing loudness level
JPH01264575A (en) * 1988-04-13 1989-10-20 Toyota Motor Corp Driver device for piezoelectric element

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7805802A (en) * 1978-05-29 1979-12-03 Philips Nv DEVICE FOR CONTROLLING A PIEEZO ELECTRICAL POSITIONING ELEMENT.
NL7805804A (en) * 1978-05-29 1979-12-03 Philips Nv DEVICE FOR APPLYING A CONTROL VOLTAGE OVER A PIEEZO ELECTRICAL POSITIONING ELEMENT.
US4714935A (en) * 1983-05-18 1987-12-22 Canon Kabushiki Kaisha Ink-jet head driving circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2279254A1 (en) * 1974-07-16 1976-02-13 Gaboriaud Paul High frequency thyristor generator for ultrasonic atomiser - has thyristor triggered from subharmonic of crystal oscillator
US4232241A (en) 1977-05-26 1980-11-04 Kabushiki Kaisha Seikosha Electric circuit for driving a piezoelectric vibrator
DE3230218A1 (en) * 1982-08-13 1984-02-23 Braun Ag, 6000 Frankfurt Electronic clock or clock radio with an alarm signal of differing loudness level
JPH01264575A (en) * 1988-04-13 1989-10-20 Toyota Motor Corp Driver device for piezoelectric element

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 14, no. 28 (E - 875) 19 January 1990 (1990-01-19) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5883861A (en) * 1997-05-14 1999-03-16 Asulab S.A. Timepiece associated with a compass and a sighting device

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ATE167581T1 (en) 1998-07-15
EP0712059B1 (en) 1998-06-17
SG45119A1 (en) 1998-01-16
CH687115GA3 (en) 1996-09-30
DE69503021T2 (en) 1999-02-11
DE69503021D1 (en) 1998-07-23
CN1084001C (en) 2002-05-01
US5635788A (en) 1997-06-03
AU694567B2 (en) 1998-07-23
HK1012168A1 (en) 1999-07-23
JPH08233957A (en) 1996-09-13
CN1129821A (en) 1996-08-28
TW371729B (en) 1999-10-11
AU3669795A (en) 1996-05-16
CH687115B5 (en) 1997-03-27

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