EP0881623B1 - Circuit de commande d'une membrane vibrante - Google Patents
Circuit de commande d'une membrane vibrante 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
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.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Magnetic Treatment Devices (AREA)
- Relay Circuits (AREA)
Description
Claims (3)
- Circuit 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) ; etdes moyens pour ouvrir le commutateur (SW) au voisinage d'un passage à zéro du courant dans le solénoide.
- 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.
- 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.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9706497A FR2763777B1 (fr) | 1997-05-22 | 1997-05-22 | Circuit de commande d'une membrane vibrante |
FR9706497 | 1997-05-22 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0881623A1 EP0881623A1 (fr) | 1998-12-02 |
EP0881623B1 true EP0881623B1 (fr) | 2003-04-23 |
Family
ID=9507298
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98410052A Expired - Lifetime EP0881623B1 (fr) | 1997-05-22 | 1998-05-18 | Circuit de commande d'une membrane vibrante |
Country Status (4)
Country | Link |
---|---|
US (1) | US6380847B1 (fr) |
EP (1) | EP0881623B1 (fr) |
DE (1) | DE69813670D1 (fr) |
FR (1) | FR2763777B1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10104590C1 (de) * | 2001-02-01 | 2002-08-08 | Infineon Technologies Ag | Akustisches Signalerzeugungsgerät und Verfahren zur Erzeugung eines akustischen Signals |
JP2010152329A (ja) * | 2008-12-25 | 2010-07-08 | Sung Il Industrial Co Ltd | 電子式平型警音器とフォトインタラプタを利用した警音器 |
CN104972966A (zh) * | 2014-04-11 | 2015-10-14 | 万喻 | 一种解决机动车船喇叭emc电磁干扰的方法及喇叭 |
CN105096929A (zh) * | 2014-04-30 | 2015-11-25 | 鸿富锦精密工业(武汉)有限公司 | 蜂鸣器电路 |
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 (de) * | 1970-06-08 | 1971-02-25 | Junghans Gmbh Geb | Elektrische klingel fuer weckeruhren. |
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 (de) * | 1986-03-15 | 1987-09-17 | Hella Kg Hueck & Co | Elektromagnetisches signalhorn |
DE3638761A1 (de) | 1986-11-13 | 1988-05-26 | Schering Ag | Verbesserte ketoreduktion von carbacyclinzwischenprodukten |
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/fr not_active Expired - Fee Related
-
1998
- 1998-05-18 EP EP98410052A patent/EP0881623B1/fr not_active Expired - Lifetime
- 1998-05-18 DE DE69813670T patent/DE69813670D1/de 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 |
---|---|
DE69813670D1 (de) | 2003-05-28 |
FR2763777B1 (fr) | 1999-08-13 |
EP0881623A1 (fr) | 1998-12-02 |
US6380847B1 (en) | 2002-04-30 |
FR2763777A1 (fr) | 1998-11-27 |
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