EP0881623B1 - Schaltung zur Steuerung einer vibrierenden Membran - Google Patents

Schaltung zur Steuerung einer vibrierenden Membran Download PDF

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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
Application number
EP98410052A
Other languages
English (en)
French (fr)
Other versions
EP0881623A1 (de
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
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 filed Critical STMicroelectronics SA
Publication of EP0881623A1 publication Critical patent/EP0881623A1/de
Application granted granted Critical
Publication of EP0881623B1 publication Critical patent/EP0881623B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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)

Claims (3)

  1. Steuerschaltung für eine vibrierende Membran (M), die durch einen Elektromagneten bzw. Solenoid (S) in Serie mit einer Gleichstromversorgung (E) und einem gesteuerten Schalter (SW) erregt wird, dadurch gekennzeichnet, dass sie Folgendes aufweist:
    einen Kondensator (C), der über eine serielle Schaltung, die den Elektromagneten (S) und den Schalter (SW) aufweist, angeordnet ist; und
    Mittel zum Öffnen des Schalters (SW) in der Nähe eines Nulldurchgangs des Stroms im Elektromagneten.
  2. Steuerschaltung nach Anspruch 1, dadurch gekennzeichnet, dass der gesteuerte Schalter gebildet ist aus einem Thyristor, der zwischen dem ersten Anschluss (A) des Kondensators und dem ersten Anschluss (B) des Elektromagneten angeordnet ist, wobei das Gate des Thyristors mit dem ersten Anschluss des Kondensators (C) über eine Zenerdiode (Z) verbunden ist, und wobei das Gate des Thyristors zu seiner Kathode über einen Widerstand (R1) verbunden ist, wobei der Thyristor intrinsisch Öffnungsmittel bildet in der Nähe eines Null Durchgangs des Stroms.
  3. Steuerschaltung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass sie weiter einen Widerstand (R) in Serie zwischen der Versorgung und dem Kondensator aufweist zum Setzen der Ladungszeitkonstante desselben.
EP98410052A 1997-05-22 1998-05-18 Schaltung zur Steuerung einer vibrierenden Membran Expired - Lifetime EP0881623B1 (de)

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 (de) 1998-12-02
EP0881623B1 true EP0881623B1 (de) 2003-04-23

Family

ID=9507298

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98410052A Expired - Lifetime EP0881623B1 (de) 1997-05-22 1998-05-18 Schaltung zur Steuerung einer vibrierenden Membran

Country Status (4)

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

Families Citing this family (4)

* Cited by examiner, † Cited by third party
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
CN104972966B (zh) * 2014-04-11 2025-09-05 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)

* 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 (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

Also Published As

Publication number Publication date
FR2763777A1 (fr) 1998-11-27
EP0881623A1 (de) 1998-12-02
FR2763777B1 (fr) 1999-08-13
DE69813670D1 (de) 2003-05-28
US6380847B1 (en) 2002-04-30

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