EP0881623B1 - Control circuit for a vibrating membrane - Google Patents
Control circuit for a vibrating membrane Download PDFInfo
- Publication number
- EP0881623B1 EP0881623B1 EP98410052A EP98410052A EP0881623B1 EP 0881623 B1 EP0881623 B1 EP 0881623B1 EP 98410052 A EP98410052 A EP 98410052A EP 98410052 A EP98410052 A EP 98410052A EP 0881623 B1 EP0881623 B1 EP 0881623B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- solenoid
- capacitor
- switch
- circuit
- control 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.)
- Expired - Lifetime
Links
- 239000012528 membrane Substances 0.000 title claims description 13
- 239000003990 capacitor Substances 0.000 claims description 22
- 244000045947 parasite Species 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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 an automobile horn or alarm device.
- FIG. 1 represents a conventional control circuit a vibrating membrane as known from US-A-5,457,437.
- 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 arranged 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 solenoid.
- 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 of 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, the indication that the voltage on capacitor C exceeds one determined threshold.
- 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 value substantially zero.
- 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 V AM 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 then repeats 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 capacitance 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.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Magnetic Treatment Devices (AREA)
- Relay Circuits (AREA)
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 an automobile horn or alarm device.
La figure 1 représente un circuit classique de commande d'une membrane vibrante tel que connu de US-A-5 457 437. 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 a vibrating membrane as known from US-A-5,457,437. 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 le solénoïde.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 arranged 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 solenoid.
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 of 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 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,
the indication that the voltage on capacitor C exceeds one
determined threshold. This has been schematically represented by
the use of a
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 reference value REF, 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.In addition, 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 fixed 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 enters conduction and a current flows in the loop oscillating comprising capacitor C and solenoid S. From as this current goes 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 is that 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 :
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 V AM 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 then repeats 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 capacitance 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)
- A control circuit for a vibrating membrane (M) excited by a solenoid (S) in series with a d.c. supply (E) and a controlled switch (SW), characterized in that it comprises:a capacitor (C) disposed across a series circuit including the solenoid (S) and the switch (SW); andmeans for opening the switch (SW) in the vicinity of a zero crossing of the current in the solenoid.
- The control circuit of claim 1, characterized in that the controlled switch is formed of a thyristor disposed between the first terminal (A) of the capacitor and the first terminal (B) of the solenoid, the gate of the thyristor being connected to the first terminal of the capacitor (C) by a zener diode (Z) and the gate of the thyristor being connected to its cathode via a resistor (R1), the thyristor intrinsically forming the opening means in the vicinity of a zero crossing of the current.
- The control circuit of claim 1 or 2, characterized in that it further includes a resistor (R) in series between the supply and the capacitor to set the charge time constant thereof.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9706497A FR2763777B1 (en) | 1997-05-22 | 1997-05-22 | CONTROL CIRCUIT FOR A VIBRATING MEMBRANE |
| FR9706497 | 1997-05-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0881623A1 EP0881623A1 (en) | 1998-12-02 |
| EP0881623B1 true 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)
| 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 |
| CN104972966B (en) * | 2014-04-11 | 2025-09-05 | 万喻 | A method for solving EMC electromagnetic interference of motor vehicle and ship speakers and speaker |
| CN105096929A (en) * | 2014-04-30 | 2015-11-25 | 鸿富锦精密工业(武汉)有限公司 | Buzzer circuit |
Family Cites Families (9)
| 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. |
| US4136337A (en) * | 1977-10-27 | 1979-01-23 | General Signal Corporation | Buzzer assembly |
| 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 |
| DE3608761A1 (en) * | 1986-03-15 | 1987-09-17 | Hella Kg Hueck & Co | ELECTROMAGNETIC SIGNAL HORN |
| DE3638761A1 (en) | 1986-11-13 | 1988-05-26 | Schering Ag | IMPROVED KETOR REDUCTION OF CARBACYCLINE INTERMEDIATE PRODUCTS |
| US5457437A (en) * | 1991-06-08 | 1995-10-10 | Mando Machinery Corporation | Sparking free circuit of electric horn |
-
1997
- 1997-05-22 FR FR9706497A patent/FR2763777B1/en not_active Expired - Fee Related
-
1998
- 1998-05-18 EP EP98410052A patent/EP0881623B1/en not_active Expired - Lifetime
- 1998-05-18 DE DE69813670T patent/DE69813670D1/en not_active Expired - Lifetime
- 1998-05-21 US US09/082,926 patent/US6380847B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| FR2763777A1 (en) | 1998-11-27 |
| FR2763777B1 (en) | 1999-08-13 |
| EP0881623A1 (en) | 1998-12-02 |
| US6380847B1 (en) | 2002-04-30 |
| DE69813670D1 (en) | 2003-05-28 |
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