EP1316931A1 - Acoustic device for warning detector - Google Patents

Acoustic device for warning detector Download PDF

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Publication number
EP1316931A1
EP1316931A1 EP01128683A EP01128683A EP1316931A1 EP 1316931 A1 EP1316931 A1 EP 1316931A1 EP 01128683 A EP01128683 A EP 01128683A EP 01128683 A EP01128683 A EP 01128683A EP 1316931 A1 EP1316931 A1 EP 1316931A1
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EP
European Patent Office
Prior art keywords
transmitter according
alarm
alarm transmitter
control pulses
transistor
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Granted
Application number
EP01128683A
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German (de)
French (fr)
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EP1316931B1 (en
Inventor
Max Grimm
Hansjürg Wälti
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Siemens AG
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Siemens Building Technologies AG
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Priority to AT01128683T priority Critical patent/ATE295981T1/en
Priority to DE50106265T priority patent/DE50106265D1/en
Priority to EP01128683A priority patent/EP1316931B1/en
Priority to ES01128683T priority patent/ES2242701T3/en
Priority to PT01128683T priority patent/PT1316931E/en
Publication of EP1316931A1 publication Critical patent/EP1316931A1/en
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Publication of EP1316931B1 publication Critical patent/EP1316931B1/en
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
    • 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
    • B06B1/0215—Driving circuits for generating pulses, e.g. bursts of oscillations, envelopes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R27/00—Public address systems
    • 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
    • B06B2201/00—Indexing scheme associated with B06B1/0207 for details covered by B06B1/0207 but not provided for in any of its subgroups
    • B06B2201/50—Application to a particular transducer type
    • B06B2201/55—Piezoelectric transducer

Definitions

  • the present invention relates to an acoustic alarm device for a hazard detector, with a piezo sound generator and a circuit driving this, which has at least one Transistor, means for generating control pulses for the at least one transistor, and has an inductance connected to the piezo sounder.
  • Such acoustic alarm devices are usually integrated in the detector or with the detector base connected.
  • a fire alarm with one thermal sensor described, in which the sounder in the detector housing directly is arranged behind the thermal sensor.
  • US-A-4 306 229 there is a stray light smoke detector described, the housing has an opening at the bottom into which a piezoelectric Element is inserted on a vibratable plate.
  • acoustic base such as those sold by Siemens Building Technologies AG AlgoRex series fire detectors (AlgoRex - registered trademark of Siemens Building Technologies AG, formerly Cerberus AG), use a so-called acoustic base, this is a part of approximate dimensions containing the audible alarm of the detector base.
  • This acoustic base is mounted on the ceiling and the detector base the detector is then attached to the acoustic base.
  • acoustic alarm devices Preferred areas of application for acoustic alarm devices are rooms in which it makes sense also to indicate the activation of a detector acoustically, for example hotel rooms, where sleeping guests are woken up and warned by the acoustic alarm can be.
  • fire detectors in private homes which are usually battery operated and are not connected to a control center, are often equipped with an acoustic alarm.
  • the fire detectors are one line to one bus connected, both for communication between the detectors and with the control panel as well as to power the detectors. Because with such a system the economy The fire alarm system depends, among other things, on the maximum number of detectors a line , it is extremely important that the acoustic alarm device have the lowest possible power consumption.
  • the invention is now intended to provide an acoustic alarm which is characterized by is characterized by minimal power consumption and is therefore also used in fire alarm systems can be where the power supply of the detector and the acoustic signal generator done via a bus.
  • this object is achieved in that the inductance and the piezo sound generator are connected in series.
  • the series connection of inductance and piezo sound generator according to the invention leads in opposite directions the known parallel connection to increase the efficiency by a multiple and to reduce electricity consumption to a corresponding fraction.
  • a first preferred embodiment of the alarm transmitter according to the invention is characterized in that that two transistors are provided, each with a sequence of Control pulses is operated.
  • the two sequences of control pulses are preferably constructed identically and against one another shifted by a little more than one pulse width.
  • the mutual shift of the control impulses the two sequences correspond to a pulse length plus a fraction of this.
  • the distance between the pulses is preferably a multiple of their length.
  • a second preferred embodiment of the alarm transmitter according to the invention is thereby characterized in that the means for generating the control pulses by a microprocessor are formed, which has a data communication connection to the hazard detector.
  • a third preferred embodiment of the alarm transmitter according to the invention is characterized in that that the two transistors form a complementary output stage, which one Pre-stage FET transistor for adjusting the level of the microprocessor is connected upstream.
  • an optical alarm indicator having hazard detectors the data communication link on the optical Alarm indicator connected.
  • Another preferred embodiment of the acoustic alarm transmitter according to the invention is characterized in that it is placed in a separate, separate from the hazard detector and preferably arranged to the side of the hazard detector or molded onto it, Housing is arranged.
  • the acoustic alarm transmitter contains a piezo sound transmitter 1, two transistors 2 and 3, a microprocessor 4 for generating control pulses for the Control of transistors 2 and 3, one arranged in series with the piezo sound generator Inductance 5 and an EMC filter 6.
  • the microprocessor 4 is connected to a supply voltage of, for example 3 V connected, which is supplied by the system bus of the relevant detector line becomes.
  • the two transistors 2 and 3, of which transistor 2 is also an FET transistor can be designed as a complementary power amplifier.
  • This complementary power amplifier is a Pre-stage FET transistor 7 upstream to adjust the level of the microprocessor 4.
  • a diode 8 serves as an induction block for the inductance 5.
  • the pre-stage FET transistor 7 downstream resistor 9 serves as a voltage divider for current limitation.
  • a data communication connection designated by reference numeral 10 is provided between the microprocessor 4 and the assigned danger detector, via which the microprocessor 4 is supplied with corresponding data when the danger detector is activated. Since it is known that practically all hazard detectors, whether fire, motion or gas detectors, have a so-called optical alarm indicator (see, for example, EP-A-0 872 817), it makes sense to connect the data communication link 10 to the alarm indicator or its control. So if the alarm indicator is activated by the signal processing of the detector for the visual display of an alarm state, the microprocessor 4 also receives corresponding information via the data communication link 10, generates control pulses I 1 and I 2 and sends this via lines 11 and 11 connected to the processor 12 to the complementary output stage with transistors 2 and 3.
  • the pulses I 1 and I 2 shown on an enlarged scale in FIG. 2 have, for example, a frequency of 1 kHz and accordingly a wavelength of 1000 microseconds and a length (duration) A between 20 and 240 microseconds, with the volume of the pulse length A being Piezo sounder 1 is adjustable.
  • the distance B between successive pulses is a multiple of the pulse length A; in the illustrated embodiment, B is between 760 and 980 microseconds.
  • the pulses I 1 and I 2 each form a pulse train, the two pulse trains having a phase shift of slightly more than a pulse length B.
  • the pulses I 2 are delayed compared to the pulses I 1 , the delay being the pulse length A plus a fraction C of the pulse length A.
  • the fraction C is 10 ⁇ s.
  • the mutual displacement of the two pulse trains causes a significant reduction in the Power consumption.
  • a supply voltage of the microprocessor 4 of, for example, 3 V. is the voltage at the output of the EMC filter 6 depending on the volume between 10 and 30 V and the volume that can be achieved with the piezo sounder is over 90 decibels.
  • the pulses I 1 make the transistor 7 conductive; a current flows and the piezo sound generator 1 charges via the transistor 2, whereby a sound is generated.
  • the pulses I 2 reaching the transistor 3 cause the piezoelectric sound generator 1 to discharge, which likewise produces a sound.
  • the complementary output stage with the two transistors 2 and 3 and their interaction with the inductor 5 connected in series with the piezo sounder 1 and the tones thereby generated when charging and discharging the piezo sounder 1 are primarily responsible for the fact that with a low supply voltage of the microprocessor 4, a loud and clearly audible acoustic warning signal can be generated.
  • a volume of 90 decibels is sufficient in all cases to the users / residents to reliably alarm these rooms.
  • the acoustic alarm is activated preferably in a separate housing and separated from the assigned hazard detector installed, which is attached to the side of the detector housing, for example.
  • Another The acoustic alarm devices can be used in corridors, stairwells, Entrance halls and the like, where there may be a greater distance between the Alarm generator and the associated hazard detector can exist. In these cases, further increase the maximum volume the circuit with a transistor bridge circuit be expanded.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Mechanical Engineering (AREA)
  • Alarm Systems (AREA)
  • Emergency Alarm Devices (AREA)
  • Fire Alarms (AREA)

Abstract

The acoustic alarm sender has a piezo acoustic sender (1) and a circuit driving it with at least one transistor (2,3), an arrangement for generating control pulses (I1,I2) for the transistor(s) as well as an inductance (5) connected in series with the piezo acoustic sender. Two transistors can be provided, each operated with a series of control pulses.

Description

Die vorliegende Erfindung betrifft einen akustischen Alarmgeber für einen Gefahrenmelder, mit einem Piezo-Schallgeber und einer diesen antreibenden Schaltung, welche mindestens einen Transistor, Mittel zur Erzeugung von Steuerimpulsen für den mindestens einen Transistor, sowie eine mit dem Piezo-Schallgeber verbundene Induktivität aufweist.The present invention relates to an acoustic alarm device for a hazard detector, with a piezo sound generator and a circuit driving this, which has at least one Transistor, means for generating control pulses for the at least one transistor, and has an inductance connected to the piezo sounder.

Derartige akustische Alarmgeber sind in der Regel in den Melder integriert oder mit dem Meldersockel verbunden. So ist beispielsweise in der US-A-4 388 617 ein Feuermelder mit einem thermischen Sensor beschrieben, bei welchem der Schallgeber im Meldergehäuse unmittelbar hinter dem thermischen Sensor angeordnet ist. In der US-A-4 306 229 ist ein Streulicht-Rauchmelder beschrieben, dessen Gehäuse am Boden eine Öffnung aufweist, in welche ein piezoelektrisches Element auf einer schwingungsfähigen Platte eingesetzt ist.Such acoustic alarm devices are usually integrated in the detector or with the detector base connected. For example, in US-A-4,388,617 there is a fire alarm with one thermal sensor described, in which the sounder in the detector housing directly is arranged behind the thermal sensor. In US-A-4 306 229 there is a stray light smoke detector described, the housing has an opening at the bottom into which a piezoelectric Element is inserted on a vibratable plate.

Andere Brandmelder, wie beispielsweise die von der Siemens Building Technologies AG vertriebenen Brandmelder der Reihe AlgoRex (AlgoRex - eingetragenes Warenzeichen der Siemens Building Technologies AG, früher Cerberus AG), verwenden einen sogenannten Akustiksockel, das ist ein den akustischen Alarmgeber enthaltendes Teil von den ungefähren Abmessungen des Meldersockels. Dieser Akustiksockel wird an der Decke montiert und der Meldersockel mit dem Melder wird dann am Akustiksockel befestigt.Other fire detectors, such as those sold by Siemens Building Technologies AG AlgoRex series fire detectors (AlgoRex - registered trademark of Siemens Building Technologies AG, formerly Cerberus AG), use a so-called acoustic base, this is a part of approximate dimensions containing the audible alarm of the detector base. This acoustic base is mounted on the ceiling and the detector base the detector is then attached to the acoustic base.

Bevorzugtes Einsatzgebiet für akustische Alarmgeber sind Räume, in denen es sinnvoll erscheint, die Aktivierung eines Melders auch akustisch anzuzeigen, also beispielsweise Hotelzimmer, wo schlafende Gäste durch den akustischen Alarmgeber aufgeweckt und gewarnt werden können. Auch Brandmelder in Privathäusern, die in der Regel batteriebetrieben und nicht an eine Zentrale angeschlossen sind, sind oft mit einem akustischen Alarmgeber ausgerüstet.Preferred areas of application for acoustic alarm devices are rooms in which it makes sense also to indicate the activation of a detector acoustically, for example hotel rooms, where sleeping guests are woken up and warned by the acoustic alarm can be. Also fire detectors in private homes, which are usually battery operated and are not connected to a control center, are often equipped with an acoustic alarm.

Bei Brandmeldesystem der jüngsten Generation sind die Brandmelder einer Linie an einen Bus angeschlossen, der sowohl zur Kommunikation der Melder untereinander und mit der Zentrale als auch zur Stromversorgung der Melder dient. Da bei einem solchen System die Wirtschaftlichkeit der Brandmeldeanlage unter anderem davon abhängt, wie viele Melder eine Linie maximal enthalten kann, ist es ausserordentlich wichtig, dass die akustischen Alarmgeber einen möglichst geringen Stromverbrauch aufweisen. In the latest generation fire detection system, the fire detectors are one line to one bus connected, both for communication between the detectors and with the control panel as well as to power the detectors. Because with such a system the economy The fire alarm system depends, among other things, on the maximum number of detectors a line , it is extremely important that the acoustic alarm device have the lowest possible power consumption.

Durch die Erfindung soll nun ein akustischer Alarmgeber angegeben werden, der sich durch einen minimalen Stromverbrauch auszeichnet und daher auch in Brandmeldeanlagen eingesetzt werden kann, bei denen die Stromversorgung der Melder und der akustischen Signalgeber über einen Bus erfolgt.The invention is now intended to provide an acoustic alarm which is characterized by is characterized by minimal power consumption and is therefore also used in fire alarm systems can be where the power supply of the detector and the acoustic signal generator done via a bus.

Diese Aufgabe wird erfindungsgemäss dadurch gelöst, dass die Induktivität und der Piezo-Schallgeber in Reihe geschaltet sind.According to the invention, this object is achieved in that the inductance and the piezo sound generator are connected in series.

Die erfindungsgemässe Serienschaltung von Induktivität und Piezo-Schallgeber führt gegenüber der bekannten Parallelschaltung zu einer Erhöhung des Wirkungsgrads um ein Mehrfaches und zur Reduktion des Stromverbrauchs auf einen entsprechenden Bruchteil.The series connection of inductance and piezo sound generator according to the invention leads in opposite directions the known parallel connection to increase the efficiency by a multiple and to reduce electricity consumption to a corresponding fraction.

Eine erste bevorzugte Ausführungsform des erfindungsgemässen Alarmgebers ist dadurch gekennzeichnet, dass zwei Transistoren vorgesehen sind, von denen jeder mit einer Folge von Steuerimpulsen betrieben wird.A first preferred embodiment of the alarm transmitter according to the invention is characterized in that that two transistors are provided, each with a sequence of Control pulses is operated.

Vorzugsweise sind die beiden Folgen von Steuerimpulsen identisch aufgebaut und gegeneinander um etwas mehr als eine Impulsbreite verschoben. Die gegenseitige Verschiebung der Steuerimpulse der beiden Folgen entspricht einer Impulslänge plus einem Bruchteil von dieser. Der Abstand wischen den Impulsen beträgt vorzugsweise ein Mehrfaches von deren Länge.The two sequences of control pulses are preferably constructed identically and against one another shifted by a little more than one pulse width. The mutual shift of the control impulses the two sequences correspond to a pulse length plus a fraction of this. The The distance between the pulses is preferably a multiple of their length.

Diese bevorzugte Ausführungsform mit zwei Transistoren und zwei gegeneinander in der beschriebenen Art verschobenen Impulsfolgen hat den Vorteil, dass einerseits das vom Piezo-Schallgeber erzeugte akustische Signal eine höhere Lautstärke erreichen kann und andererseits der Stromverbrauch dennoch sehr gering ist. Die Lautstärke selbst ist über die Dauer der Impulse regelbar.This preferred embodiment with two transistors and two against each other in the described The kind of shifted pulse trains has the advantage that on the one hand that of the piezo sounder generated acoustic signal can reach a higher volume and on the other hand the power consumption is still very low. The volume itself is over the duration of the Adjustable impulses.

Eine zweite bevorzugte Ausführungsform des erfindungsgemässen Alarmgebers ist dadurch gekennzeichnet, dass die Mittel zur Erzeugung der Steuerimpulse durch einen Mikroprozessor gebildet sind, welcher eine Daten-Kommunikationsverbindung zum Gefahrenmelder aufweist.A second preferred embodiment of the alarm transmitter according to the invention is thereby characterized in that the means for generating the control pulses by a microprocessor are formed, which has a data communication connection to the hazard detector.

Eine dritte bevorzugte Ausführungsform des erfindungsgemässen Alarmgebers ist dadurch gekennzeichnet, dass die beiden Transistoren eine Komplementär-Endstufe bilden, welcher ein Vorstufen-FET-Transistor zur Anpassung des Pegels des Mikroprozessors vorgeschaltet ist.A third preferred embodiment of the alarm transmitter according to the invention is characterized in that that the two transistors form a complementary output stage, which one Pre-stage FET transistor for adjusting the level of the microprocessor is connected upstream.

Gemäss einer vierten bevorzugten Ausführungsform ist bei einem einen optischen Alarmindikator aufweisenden Gefahrenmelder die Daten-Kommunikationsverbindung an den optischen Alarmindikator angeschlossen.According to a fourth preferred embodiment, there is an optical alarm indicator having hazard detectors the data communication link on the optical Alarm indicator connected.

Eine weitere bevorzugte Ausführungsform des erfindungsgemässen akustischen Alarmgebers ist dadurch gekennzeichnet, dass dieser in einem separaten, vom Gefahrenmelder abgesetzten und vorzugsweise seitlich neben dem Gefahrenmelder angeordneten oder an diesen angeformten, Gehäuse angeordnet ist. Another preferred embodiment of the acoustic alarm transmitter according to the invention is characterized in that it is placed in a separate, separate from the hazard detector and preferably arranged to the side of the hazard detector or molded onto it, Housing is arranged.

Im folgenden wird die Erfindung anhand eines Ausführungsbeispiels und der Zeichnungen näher erläutert; es zeigt:

  • Fig. 1 ein Blockschaltbild eines erfindungsgemässen akustischen Alarmgebers; und
  • Fig. 2 ein Diagramm zur Funktionserläuterung.
    • In the following the invention is explained in more detail using an exemplary embodiment and the drawings; it shows:
  • 1 shows a block diagram of an acoustic alarm transmitter according to the invention; and
  • Fig. 2 is a diagram for explanation of function.

    • Der erfindungsgemässe akustische Alarmgeber enthält gemäss Fig. 1 einen Piezo-Schallgeber 1, zwei Transistoren 2 und 3, einen Mikroprozessor 4 zur Erzeugung von Steuerimpulsen für die Ansteuerung der Transistoren 2 und 3, eine in Serie mit dem Piezo-Schallgeber angeordnete Induktivität 5 sowie ein EMV-Filter 6. Der Mikroprozessor 4 ist an eine Speisespannung von beispielsweise 3 V angeschlossen, welche vom Systembus der betreffenden Melderlinie geliefert wird.According to FIG. 1, the acoustic alarm transmitter according to the invention contains a piezo sound transmitter 1, two transistors 2 and 3, a microprocessor 4 for generating control pulses for the Control of transistors 2 and 3, one arranged in series with the piezo sound generator Inductance 5 and an EMC filter 6. The microprocessor 4 is connected to a supply voltage of, for example 3 V connected, which is supplied by the system bus of the relevant detector line becomes.

    Die beiden Transistoren 2 und 3, von denen der Transistor 2 ebenfalls ein FET-Transistor sein kann, sind als Komplementär-Endstufe ausgebildet. Dieser Komplementär-Endstufe ist ein Vorstufen-FET-Transistor 7 zur Anpassung des Pegels des Mikroprozessors 4 vorgeschaltet. Eine Diode 8 dient als Induktionssperre der Induktivität 5. Ein dem Vorstufen-FET-Transistor 7 nachgeschalteter Widerstand 9 dient als Spannungsteiler zur Strombegrenzung.The two transistors 2 and 3, of which transistor 2 is also an FET transistor can be designed as a complementary power amplifier. This complementary power amplifier is a Pre-stage FET transistor 7 upstream to adjust the level of the microprocessor 4. A diode 8 serves as an induction block for the inductance 5. The pre-stage FET transistor 7 downstream resistor 9 serves as a voltage divider for current limitation.

    Ausserdem ist eine mit dem Bezugszeichen 10 bezeichnete Daten-Kommunikationsverbindung zwischen dem Mikroprozessor 4 und dem zugeordneten Gefahrenmelder vorgesehen, über welche dem Mikroprozessor 4 bei einer Aktivierung des Gefahrenmelders entsprechende Daten zugeführt werden. Da bekanntlich praktisch alle Gefahrenmelder, ob Feuer-, Bewegungs- oder Gasmelder, einen sogenannten optischen Alarmindikator aufweisen (siehe dazu beispielsweise EP-A-0 872 817), ist es sinnvoll, die Daten-Kommunikationsverbindung 10 an den Alarmindikator oder dessen Ansteuerung anzuschliessen. Wenn also der Alarmindikator von der Signalverarbeitung des Melders zur optischen Anzeige eines Alarmzustands aktiviert wird, erhält der Mikroprozessor 4 über die Daten-Kommunikationsverbindung 10 ebenfalls eine entsprechende Information, erzeugt Steuerimpulse I1 und I2 und sendet diese über an den Prozessor angeschlossene Leitungen 11 und 12 an die Komplementär-Endstufe mit den Transistoren 2 und 3.In addition, a data communication connection, designated by reference numeral 10, is provided between the microprocessor 4 and the assigned danger detector, via which the microprocessor 4 is supplied with corresponding data when the danger detector is activated. Since it is known that practically all hazard detectors, whether fire, motion or gas detectors, have a so-called optical alarm indicator (see, for example, EP-A-0 872 817), it makes sense to connect the data communication link 10 to the alarm indicator or its control. So if the alarm indicator is activated by the signal processing of the detector for the visual display of an alarm state, the microprocessor 4 also receives corresponding information via the data communication link 10, generates control pulses I 1 and I 2 and sends this via lines 11 and 11 connected to the processor 12 to the complementary output stage with transistors 2 and 3.

    Die in Fig. 2 in vergrössertem Massstab dargestellten Impulse I1 und I2 haben beispielsweise eine Frequenz von 1 kHz und dementsprechend eine Wellenlänge von 1000 µs sowie eine Länge (Dauer) A zwischen 20 und 240 µs, wobei über die Impulslänge A die Lautstärke des Piezo-Schallgebers 1 regelbar ist. Der Abstand B zwischen aufeinander folgenden Impulsen beträgt ein Mehrfaches der Impulslänge A; beim dargestellten Ausführungsbeispiel liegt B zwischen 760 und 980 µs. Die Impulse I1 und I2 bilden je einen Impulszug, wobei die beiden Impulszüge eine Phasenverschiebung von etwas mehr als einer Impulslänge B aufweisen. Oder mit anderen Worten, die Impulse I2 sind gegenüber den Impulsen I1 verzögert, wobei die Verzögerung jeweils die Impulslänge A plus einen Bruchteil C der Impulslänge A beträgt. Beispielsweise beträgt der Bruchteil C 10 µs. The pulses I 1 and I 2 shown on an enlarged scale in FIG. 2 have, for example, a frequency of 1 kHz and accordingly a wavelength of 1000 microseconds and a length (duration) A between 20 and 240 microseconds, with the volume of the pulse length A being Piezo sounder 1 is adjustable. The distance B between successive pulses is a multiple of the pulse length A; in the illustrated embodiment, B is between 760 and 980 microseconds. The pulses I 1 and I 2 each form a pulse train, the two pulse trains having a phase shift of slightly more than a pulse length B. In other words, the pulses I 2 are delayed compared to the pulses I 1 , the delay being the pulse length A plus a fraction C of the pulse length A. For example, the fraction C is 10 µs.

    Die gegenseitige Verschiebung der beiden Impulszüge bewirkt eine deutliche Reduktion des Stromverbrauchs. Bei einer Speisespannung des Mikroprozessors 4 von beispielsweise 3 V liegt die Spannung am Ausgang des EMV-Filters 6 in Abhängigkeit von der Lautstärke zwischen 10 und 30 V und die mit dem Piezo-Schallgeber erreichbare Lautstärke beträgt über 90 Dezibel.The mutual displacement of the two pulse trains causes a significant reduction in the Power consumption. With a supply voltage of the microprocessor 4 of, for example, 3 V. is the voltage at the output of the EMC filter 6 depending on the volume between 10 and 30 V and the volume that can be achieved with the piezo sounder is over 90 decibels.

    Sobald der Mikroprozessor 4 mit der Erzeugung der Steuerimpulse I1 und I2 beginnt, machen die Impulse I1 den Transistor 7 leitend; es fliesst ein Strom und der Piezo-Schallgeber 1 lädt sich über den Transistor 2 auf, wodurch ein Ton erzeugt wird. Die zum Transistor 3 gelangenden Impulse I2 bewirken eine Entladung des Piezo-Schallgebers 1, wodurch ebenfalls ein Ton erzeugt wird. Die Komplementär-Endstufe mit den beiden Transistoren 2 und 3 und deren Zusammenwirken mit der in Serie mit dem Piezo-Schallgeber 1 geschaltete Induktivität 5 und die dadurch beim Auf- und Entladen des Piezo-Schallgebers 1 erzeugten Töne sind in erster Linie dafür verantwortlich, dass mit einer geringen Speisespannung des Mikroprozessors 4 ein lautes und deutlich hörbares akustisches Warnsignal erzeugt werden kann.As soon as the microprocessor 4 starts generating the control pulses I 1 and I 2 , the pulses I 1 make the transistor 7 conductive; a current flows and the piezo sound generator 1 charges via the transistor 2, whereby a sound is generated. The pulses I 2 reaching the transistor 3 cause the piezoelectric sound generator 1 to discharge, which likewise produces a sound. The complementary output stage with the two transistors 2 and 3 and their interaction with the inductor 5 connected in series with the piezo sounder 1 and the tones thereby generated when charging and discharging the piezo sounder 1 are primarily responsible for the fact that with a low supply voltage of the microprocessor 4, a loud and clearly audible acoustic warning signal can be generated.

    Für übliche Applikationen akustischer Alarmgeber in kleineren Räumen, wie beispielsweise Hotelzimmern, ist eine Lautstärke von 90 Dezibel in allen Fällen ausreichend, um die Benutzer/Bewohner dieser Räume zuverlässig zu alarmieren. In diesen Fällen ist der akustische Alarmgeber bevorzugt in ein separates und vom zugeordneten Gefahrenmelder abgesetztes Gehäuse eingebaut, welches beispielsweise seitlich an des Meldergehäuse angesetzt ist. Eine weitere Anwendungsmöglichkeit der akustischen Alarmgeber ist deren Einsatz in Gängen, Stiegenhäusern, Eingangshallen und dergleichen, wo eventuell eine grössere Distanz zwischen dem Alarmgeber und dem zugeordneten Gefahrenmelder bestehen kann. In diesen Fällen kann zur weiteren Erhöhung der maximalen Lautstärke die Schaltung mit einer Transistor-Brückenschaltung erweitert werden.For common applications of acoustic alarm devices in smaller rooms, such as Hotel rooms, a volume of 90 decibels is sufficient in all cases to the users / residents to reliably alarm these rooms. In these cases the acoustic alarm is activated preferably in a separate housing and separated from the assigned hazard detector installed, which is attached to the side of the detector housing, for example. Another The acoustic alarm devices can be used in corridors, stairwells, Entrance halls and the like, where there may be a greater distance between the Alarm generator and the associated hazard detector can exist. In these cases, further increase the maximum volume the circuit with a transistor bridge circuit be expanded.

    Claims (10)

    Akustischer Alarmgeber für einen Gefahrenmelder, mit einem Piezo-Schallgeber (1) und einer diesen antreibenden Schaltung, welche mindestens einen Transistor (2, 3), Mittel zur Erzeugung von Steuerimpulsen (I1, I2) für den mindestens einen Transistor (2, 3), sowie eine mit dem Piezo-Schallgeber (1) verbundene Induktivität (5) aufweist, dadurch gekennzeichnet, dass die Induktivität (5) und der Piezo-Schallgeber (1) in Reihe geschaltet sind.Acoustic alarm transmitter for a hazard detector, with a piezo sound transmitter (1) and a circuit driving it, which has at least one transistor (2, 3), means for generating control pulses (I 1 , I 2 ) for the at least one transistor (2, 3), as well as an inductance (5) connected to the piezo sound generator (1), characterized in that the inductance (5) and the piezo sound generator (1) are connected in series. Alarmgeber nach Anspruch 1, dadurch gekennzeichnet, dass zwei Transistoren (2, 3) vorgesehen sind, von denen jeder mit einer Folge von Steuerimpulsen (I1 bzw. I2) betrieben wird.Alarm transmitter according to claim 1, characterized in that two transistors (2, 3) are provided, each of which is operated with a sequence of control pulses (I 1 or I 2 ). Alarmgeber nach Anspruch 2, dadurch gekennzeichnet, dass die beiden Folgen von Steuerimpulsen (I1, I2) identisch aufgebaut und gegeneinander um etwas mehr als eine Impulslänge (A) verschoben sind.Alarm transmitter according to claim 2, characterized in that the two sequences of control pulses (I 1 , I 2 ) are constructed identically and are shifted from each other by slightly more than one pulse length (A). Alarmgeber nach Anspruch 3, dadurch gekennzeichnet, dass die gegenseitige Verschiebung der Steuerimpulse (I1, I2) der beiden Folgen einer Impulslänge (A) plus einem Bruchteil (C) von dieser entspricht.Alarm transmitter according to claim 3, characterized in that the mutual displacement of the control pulses (I 1 , I 2 ) of the two sequences corresponds to a pulse length (A) plus a fraction (C) of this. Alarmgeber nach Anspruch nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, dass der Abstand (B) zwischen den Impulsen (I1, I2) ein Mehrfaches von deren Länge (A) beträgt.Alarm transmitter according to claim 2, characterized in that the distance (B) between the pulses (I 1 , I 2 ) is a multiple of their length (A). Alarmgeber nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Mittel zur Erzeugung der Steuerimpulse (I1, I2) durch einen Mikroprozessor (4) gebildet sind, welcher eine Daten-Kommunikationsverbindung (8) zum Gefahrenmelder aufweist.Alarm transmitter according to one of claims 1 to 5, characterized in that the means for generating the control pulses (I 1 , I 2 ) are formed by a microprocessor (4) which has a data communication link (8) to the hazard detector. Alarmgeber nach den Ansprüchen 2 und 6, dadurch gekennzeichnet, dass die beiden Transistoren (2, 3) eine Komplementär-Endstufe bilden, welcher ein Vorstufen-FET-Transistor (7) zur Anpassung des Pegels des Mikroprozessors (4) vorgeschaltet ist.Alarm transmitter according to claims 2 and 6, characterized in that the two transistors (2, 3) form a complementary output stage, which is connected upstream of a pre-stage FET transistor (7) for adjusting the level of the microprocessor (4). Alarmgeber nach Anspruch 7, dadurch gekennzeichnet, dass bei einem einen optischen Alarmindikator aufweisenden Gefahrenmelder die Daten-Kommunikationsverbindung (8) an den optischen Alarmindikator angeschlossen ist.Alarm transmitter according to claim 7, characterized in that in the case of a danger detector having an optical alarm indicator, the data communication link (8) is connected to the optical alarm indicator. Alarmgeber nach einem der Ansprüche 2 bis 8, dadurch gekennzeichnet, zur weiteren Erhöhung der maximalen Lautstärke die Schaltung mit einer Transistor-Brückenschaltung erweitert ist.Alarm transmitter according to one of claims 2 to 8, characterized in that the circuit is expanded with a transistor bridge circuit to further increase the maximum volume. Alarmgeber nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass dieser in einem separaten, vom Gefahrenmelder abgesetzten und vorzugsweise seitlich neben dem Gefahrenmelder angeordneten oder an diesen angeformten, Gehäuse angeordnet ist.Alarm transmitter according to one of Claims 1 to 9, characterized in that it is arranged in a separate housing which is set apart from the hazard detector and is preferably arranged laterally next to or molded onto the hazard detector.
    EP01128683A 2001-12-01 2001-12-01 Acoustic device for warning detector Expired - Lifetime EP1316931B1 (en)

    Priority Applications (5)

    Application Number Priority Date Filing Date Title
    AT01128683T ATE295981T1 (en) 2001-12-01 2001-12-01 ACOUSTIC ALARM FOR A HAZARD DETECTOR
    DE50106265T DE50106265D1 (en) 2001-12-01 2001-12-01 Acoustic alarm device for a hazard alarm
    EP01128683A EP1316931B1 (en) 2001-12-01 2001-12-01 Acoustic device for warning detector
    ES01128683T ES2242701T3 (en) 2001-12-01 2001-12-01 ACOUSTIC ALARM TRANSMITTER FOR A DANGER WARNING.
    PT01128683T PT1316931E (en) 2001-12-01 2001-12-01 ACOUSTIC ALARM DEVICE FOR AN EMERGENCY SIGNAL

    Applications Claiming Priority (1)

    Application Number Priority Date Filing Date Title
    EP01128683A EP1316931B1 (en) 2001-12-01 2001-12-01 Acoustic device for warning detector

    Publications (2)

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    EP1316931A1 true EP1316931A1 (en) 2003-06-04
    EP1316931B1 EP1316931B1 (en) 2005-05-18

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    EP01128683A Expired - Lifetime EP1316931B1 (en) 2001-12-01 2001-12-01 Acoustic device for warning detector

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    EP (1) EP1316931B1 (en)
    AT (1) ATE295981T1 (en)
    DE (1) DE50106265D1 (en)
    ES (1) ES2242701T3 (en)
    PT (1) PT1316931E (en)

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    WO2006058608A1 (en) * 2004-12-01 2006-06-08 Asulab S.A. Polyphonic sound generating method

    Families Citing this family (1)

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    Publication number Priority date Publication date Assignee Title
    EP1746552A1 (en) 2005-07-19 2007-01-24 Siemens Schweiz AG Bi-directional communication between an acoustic hazard detecting unit and at least a further unit

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    US4954960A (en) * 1986-11-07 1990-09-04 Alcon Laboratories Linear power control for ultrasonic probe with tuned reactance
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    Also Published As

    Publication number Publication date
    ES2242701T3 (en) 2005-11-16
    EP1316931B1 (en) 2005-05-18
    ATE295981T1 (en) 2005-06-15
    DE50106265D1 (en) 2005-06-23
    PT1316931E (en) 2005-09-30

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