EP1316931B1 - Acoustic device for warning detector - Google Patents

Acoustic device for warning detector Download PDF

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Publication number
EP1316931B1
EP1316931B1 EP01128683A EP01128683A EP1316931B1 EP 1316931 B1 EP1316931 B1 EP 1316931B1 EP 01128683 A EP01128683 A EP 01128683A EP 01128683 A EP01128683 A EP 01128683A EP 1316931 B1 EP1316931 B1 EP 1316931B1
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EP
European Patent Office
Prior art keywords
alarm
transistor
hazard
transmitter
control pulses
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EP01128683A
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German (de)
French (fr)
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EP1316931A1 (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 EP01128683A priority Critical patent/EP1316931B1/en
Priority to AT01128683T priority patent/ATE295981T1/en
Priority to ES01128683T priority patent/ES2242701T3/en
Priority to DE50106265T priority patent/DE50106265D1/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 danger detector, with a piezo sounder and a circuit driving this, which at least one Transistor, means for generating control pulses for the at least one transistor, and having an inductance connected in series with the piezo sounder., characterized characterized in that two transistors are provided, each of which is connected in a sequence of Control pulses is operated, with one transistor for charging and the other Transistor for discharging the series connection of piezo sounder and inductance is used.
  • An acoustic alarm device of this kind is known per se from US Pat. No. 6,166,624, namely preferably for use in vehicles.
  • Acoustic alarm device for a hazard alarm are usually integrated into the detector or connected to the detector base. So is for example, in US-A-4 388 617 a fire detector with a thermal sensor is described, in which the sounder in the detector housing immediately behind the thermal Sensor is arranged. In US-A-4 306 229 a scattered light smoke detector is described, whose housing has an opening at the bottom, in which a piezoelectric element is used on a vibratory plate.
  • Fire detector series AlgoRex AlgoRex - registered trademark of Siemens Building Technologies AG, formerly Cerberus AG
  • acoustic socket this is a part containing the audible alarm of the approximate dimensions of the detector base. This acoustic base is mounted on the ceiling and the detector base with the detector is then attached to the acoustic socket.
  • acoustic alarms are rooms in which it makes sense to activate the activation of a detector acoustically, eg hotel rooms, where sleeping guests are awakened and warned by the audible alarm can be.
  • fire detectors in private homes which are usually battery operated and not connected to a control panel, are often equipped with an audible alarm.
  • the fire detectors are one line to a bus connected to both the communication of the detectors with each other and with the control center as well as to power the detectors. Because with such a system the economy Among other things, the fire alarm system depends on how many detectors a line maximum It is extremely important that the audible alarms have a have the lowest possible power consumption.
  • the invention will now be an acoustic alarm can be specified, which is characterized by a minimum power consumption and therefore also used in fire alarm systems can be where the power supply to the detectors and the acoustic signalers via a bus.
  • This object is achieved according to the invention by providing two transistors each of which is operated with a sequence of control pulses, the one Transistor for charging and the other transistor for discharging the series circuit of piezo sounder and inductance is used.
  • the inventive use of two transistors and their interaction with the inductor connected in series with the piezo sounder and the resulting and discharging the sounds generated by the piezo sounder are primarily responsible for that with a low supply voltage a loud and clearly audible acoustic Warning signal can be generated.
  • a first preferred embodiment of the inventive alarm is characterized characterized in that the two sequences of control pulses are constructed identically and against each other shifted by just over one pulse width.
  • the mutual shift the control pulses of the two sequences corresponds to a pulse length plus a fraction of this.
  • the distance between the pulses is preferably a multiple of that Length.
  • the two sequences of pulses shifted from each other in the manner described have the Advantage that on the one hand the acoustic signal generated by the piezo sounder has a higher Volume can reach and on the other hand, the power consumption is still very low.
  • the Volume itself is adjustable over the duration of the pulses.
  • a second preferred embodiment of the alarm device according to the invention is characterized characterized in that the means for generating the control pulses by a microprocessor are formed, which has a data communication link to the hazard detector.
  • a third preferred embodiment of the alarm device according to the invention is characterized characterized in that the two transistors form a complementary output stage, which a Pre-stage FET transistor for adjusting the level of the microprocessor is connected upstream.
  • one is an optical alarm indicator Hazard detectors connect the data communication link to the optical Alarm indicator connected.
  • a further preferred embodiment is characterized in that this in one separate, remote from the danger detector and preferably laterally next to the danger detector arranged or molded onto this, housing is arranged.
  • the inventive acoustic alarm transmitter according to FIG. 1 contains a piezo sounder 1, two transistors 2 and 3, a microprocessor 4 for generating control pulses for the Control of the transistors 2 and 3, arranged in series with the piezo sounder Inductance 5 and an EMC filter 6.
  • the microprocessor 4 is connected to a supply voltage of, for example 3 V connected, which are supplied by the system bus of the respective detector line becomes.
  • the two transistors 2 and 3, of which the transistor 2 also be a FET transistor can, are designed as a complementary amplifier.
  • This complementary amplifier is a Pre-stage FET transistor 7 upstream of adjusting the level of the microprocessor 4.
  • a diode 8 serves as an induction lock of the inductor 5.
  • a the pre-stage FET transistor. 7 Downstream resistor 9 serves as a voltage divider to limit the current.
  • a designated by the reference numeral 10 data communication connection between the microprocessor 4 and the associated hazard detector is provided, via which the microprocessor 4 upon activation of the hazard detector corresponding data are supplied. Since, as is known, virtually all hazard detectors, whether fire, motion or gas detectors, have a so-called visual 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.
  • the microprocessor 4 receives via the data communication link 10 also corresponding information, generates control pulses I 1 and I 2 and sends them via connected to the processor lines 11 and 12 to the complementary output stage with the transistors 2 and 3.
  • the pulses I 1 and I 2 illustrated in an enlarged scale in FIG. 2 have, for example, a frequency of 1 kHz and, accordingly, a wavelength of 1000 ⁇ s and a length (duration) A of between 20 and 240 ⁇ s, the volume of the pulse being determined by the pulse length A.
  • 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, wherein the two pulse trains have a phase shift of a little more than a pulse length B.
  • the pulses I 2 are delayed with respect to the pulses I 1 , the delay in each case 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 of the Power consumption.
  • a supply voltage of the microprocessor 4 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 achievable with the piezo sounder volume is over 90 decibels.
  • the pulses I 1 make the transistor 7 conductive; a current flows and the piezo sounder 1 charges via the transistor 2, whereby a sound is generated.
  • the reaching of the transistor 3 pulses I 2 cause a discharge of the piezo sounder 1, which also 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 sounds generated thereby during the charging and discharging of 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 audible warning signal can be generated.
  • a volume of 90 decibels in all cases is sufficient to accommodate the users / residents to reliably alert these rooms.
  • the audible alarm is preferably in a separate and remote from the associated hazard alarm housing installed, which is attached for example laterally to the detector housing.
  • Another Application of the acoustic alarm is their use in corridors, staircases, Entrance halls and the like, where possibly a greater distance between the Alarm and the associated hazard alarm can exist. In these cases, the further increase the maximum volume of the circuit with a transistor bridge circuit be extended.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (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 in Reihe geschaltete Induktivität aufweist., dadurch gekennzeichnet, dass zwei Transistoren vorgesehen sind, von denen jeder mit einer Folge von Steuerimpulsen betrieben wird, wobei der eine Transistor für die Aufladung und der andere Transistor für die Entladung der Serienschaltung von Piezo-Schallgeber und Induktivität dient.The present invention relates to an acoustic alarm device for a danger detector, with a piezo sounder and a circuit driving this, which at least one Transistor, means for generating control pulses for the at least one transistor, and having an inductance connected in series with the piezo sounder., characterized characterized in that two transistors are provided, each of which is connected in a sequence of Control pulses is operated, with one transistor for charging and the other Transistor for discharging the series connection of piezo sounder and inductance is used.

Ein akustischer Alarmgeber dieser Art ist aus der US-A-6 166 624 an sich bekannt, und zwar vorzugsweise zur Verwendung in Fahrzeugen. Akustische Alarmgeber für einen Gefahrenmelder 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 piezo-elektrisches Element auf einer schwingungsfähigen Platte eingesetzt ist.An acoustic alarm device of this kind is known per se from US Pat. No. 6,166,624, namely preferably for use in vehicles. Acoustic alarm device for a hazard alarm are usually integrated into the detector or connected to the detector base. So is For example, in US-A-4 388 617 a fire detector with a thermal sensor is described, in which the sounder in the detector housing immediately behind the thermal Sensor is arranged. In US-A-4 306 229 a scattered light smoke detector is described, whose housing has an opening at the bottom, in which a piezoelectric element is used on a vibratory 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 Fire detector series AlgoRex (AlgoRex - registered trademark of Siemens Building Technologies AG, formerly Cerberus AG), use a so-called acoustic socket, this is a part containing the audible alarm of the approximate dimensions of the detector base. This acoustic base is mounted on the ceiling and the detector base with the detector is then attached to the acoustic socket.

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.The preferred field of application for acoustic alarms are rooms in which it makes sense to activate the activation of a detector acoustically, eg hotel rooms, where sleeping guests are awakened and warned by the audible alarm can be. Also fire detectors in private homes, which are usually battery operated and not connected to a control panel, are often equipped with an audible 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 alarm system, the fire detectors are one line to a bus connected to both the communication of the detectors with each other and with the control center as well as to power the detectors. Because with such a system the economy Among other things, the fire alarm system depends on how many detectors a line maximum It is extremely important that the audible alarms have a 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 will now be an acoustic alarm can be specified, which is characterized by a minimum power consumption and therefore also used in fire alarm systems can be where the power supply to the detectors and the acoustic signalers via a bus.

Diese Aufgabe wird erfindungsgemäss dadurch gelöst, dass zwei Transistoren vorgesehen sind, von denen jeder mit einer Folge von Steuerimpulsen betrieben wird, wobei der eine Transistor für die Aufladung und der andere Transistor für die Entladung der Serienschaltung von Piezo-Schallgeber und Induktivität dient.This object is achieved according to the invention by providing two transistors each of which is operated with a sequence of control pulses, the one Transistor for charging and the other transistor for discharging the series circuit of piezo sounder and inductance is used.

Die erfindungsgemässe Verwendung von zwei Transistoren und deren Zusammenwirken mit der in Serie mit dem Piezo-Schallgeber geschalteten Induktivität sowie die dadurch beim Auf- und Entladen des Piezo-Schallgebers erzeugten Töne sind in erster Linie dafür verantwortlich, dass mit einer geringen Speisespannung ein lautes und deutlich hörbares akustisches Warnsignal erzeugt werden kann.The inventive use of two transistors and their interaction with the inductor connected in series with the piezo sounder and the resulting and discharging the sounds generated by the piezo sounder are primarily responsible for that with a low supply voltage a loud and clearly audible acoustic Warning signal can be generated.

Eine erste bevorzugte Ausführungsform des erfindungsgemässen Alarmgebers ist dadurch gekennzeichnet, dass die beiden Folgen von Steuerimpulsen identisch aufgebaut und gegeneinander um etwas mehr als eine Impulsbreite verschoben sind. 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.A first preferred embodiment of the inventive alarm is characterized characterized in that the two sequences of control pulses are constructed identically and against each other shifted by just over one pulse width. The mutual shift the control pulses of the two sequences corresponds to a pulse length plus a fraction of this. The distance between the pulses is preferably a multiple of that Length.

Die beiden gegeneinander in der beschriebenen Art verschobenen Impulsfolgen haben 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.The two sequences of pulses shifted from each other in the manner described have the Advantage that on the one hand the acoustic signal generated by the piezo sounder has a higher Volume can reach and on the other hand, the power consumption is still very low. The Volume itself is adjustable over the duration of the pulses.

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. 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 second preferred embodiment of the alarm device according to the invention is characterized characterized in that the means for generating the control pulses by a microprocessor are formed, which has a data communication link to the hazard detector. A third preferred embodiment of the alarm device according to the invention is characterized characterized in that the two transistors form a complementary output stage, which a 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, one is an optical alarm indicator Hazard detectors connect the data communication link to the optical Alarm indicator connected.

Eine weitere bevorzugte Ausführungsform 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. A further preferred embodiment is characterized in that this in one separate, remote from the danger detector and preferably laterally next to the danger detector arranged or molded onto this, 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 with reference to an embodiment and the drawings will be explained in more detail; it shows:
Fig. 1
a block diagram of an inventive acoustic alarm device; and
Fig. 2
a diagram for explaining the 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.The inventive acoustic alarm transmitter according to FIG. 1 contains a piezo sounder 1, two transistors 2 and 3, a microprocessor 4 for generating control pulses for the Control of the transistors 2 and 3, arranged in series with the piezo sounder Inductance 5 and an EMC filter 6. The microprocessor 4 is connected to a supply voltage of, for example 3 V connected, which are supplied by the system bus of the respective 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 the transistor 2 also be a FET transistor can, are designed as a complementary amplifier. This complementary amplifier is a Pre-stage FET transistor 7 upstream of adjusting the level of the microprocessor 4. A diode 8 serves as an induction lock of the inductor 5. A the pre-stage FET transistor. 7 Downstream resistor 9 serves as a voltage divider to limit the current.

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 designated by the reference numeral 10 data communication connection between the microprocessor 4 and the associated hazard detector is provided, via which the microprocessor 4 upon activation of the hazard detector corresponding data are supplied. Since, as is known, virtually all hazard detectors, whether fire, motion or gas detectors, have a so-called visual 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. Thus, when the alarm indicator is activated by the signal processing of the detector for visual indication of an alarm condition, the microprocessor 4 receives via the data communication link 10 also corresponding information, generates control pulses I 1 and I 2 and sends them via connected to the processor lines 11 and 12 to the complementary output stage with the 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 illustrated in an enlarged scale in FIG. 2 have, for example, a frequency of 1 kHz and, accordingly, a wavelength of 1000 μs and a length (duration) A of between 20 and 240 μs, the volume of the pulse being determined by the pulse length A. 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, wherein the two pulse trains have a phase shift of a little more than a pulse length B. In other words, the pulses I 2 are delayed with respect to the pulses I 1 , the delay in each case 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 of the Power consumption. At a supply voltage of the microprocessor 4, 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 achievable with the piezo sounder volume 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 sounder 1 charges via the transistor 2, whereby a sound is generated. The reaching of the transistor 3 pulses I 2 cause a discharge of the piezo sounder 1, which also 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 sounds generated thereby during the charging and discharging of 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 audible 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 in all cases is sufficient to accommodate the users / residents to reliably alert these rooms. In these cases, the audible alarm is preferably in a separate and remote from the associated hazard alarm housing installed, which is attached for example laterally to the detector housing. Another Application of the acoustic alarm is their use in corridors, staircases, Entrance halls and the like, where possibly a greater distance between the Alarm and the associated hazard alarm can exist. In these cases, the further increase the maximum volume of the circuit with a transistor bridge circuit be extended.

Claims (9)

  1. Acoustic alarm transmitter for a hazard-warning alarm device, having a piezo-sound transmitter (1) and a circuit which drives this sound transmitter and has at least one transistor (2, 3), means for generating control pulses (I1, I2) for the at least one transistor (2, 3), and an induction coil (5) which is connected in series with the piezo-sound transmitter (1), characterized in that two transistors (2, 3) are provided and each of these transistors is operated by a sequence of control pulses (I1 or I2), one transistor (2) being used to charge the series circuit comprising piezo-sound transmitter (1) and induction coil (5) and the other transistor (3) being used to discharge the said series circuit comprising piezo-sound transmitter (1) and induction coil (5).
  2. Alarm transmitter according to Claim 1, characterized in that the two sequences of control pulses (I1, I2) are identical and are shifted with respect to one another by a little more than one pulse length (A).
  3. Alarm transmitter according to Claim 2, characterized in that the shifting of the control pulses (I1, I2) of the two sequences with respect to one another corresponds to one pulse length (A) plus a fraction (C) thereof.
  4. Alarm transmitter according to claim according to Claim 2 or 3, characterized in that the interval (B) between the pulses (I1, I2) is a multiple of their length (A).
  5. Alarm transmitter according to one of Claims 1 to 4, characterized in that the means for generating the control pulses (I1, I2) are formed by a microprocessor (4) which has a data communications link (8) to the hazard-warning alarm device.
  6. Alarm transmitter according to Claims 3 to 5, characterized in that the two transistors (2, 3) form a complementary output stage, an input-stage FET transistor (7) for adapting the level of the microprocessor (4) being connected upstream of this output stage.
  7. Alarm transmitter according to Claim 6, characterized in that in a hazard-warning alarm device having a visual alarm indicator the data communications link (8) is connected to the visual alarm indicator.
  8. Alarm transmitter according to one of Claims 1 to 7, characterized in that the circuit is extended by a transistor bridge circuit in order to further increase the maximum volume.
  9. Alarm transmitter according to one of Claims 1 to 8, characterized in that this alarm transmitter is arranged in a separate housing which is set apart from the hazard-warning alarm device and is preferably arranged beside the hazard-warning alarm device or is formed integrally with it.
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
EP01128683A EP1316931B1 (en) 2001-12-01 2001-12-01 Acoustic device for warning detector
AT01128683T ATE295981T1 (en) 2001-12-01 2001-12-01 ACOUSTIC ALARM FOR A HAZARD DETECTOR
ES01128683T ES2242701T3 (en) 2001-12-01 2001-12-01 ACOUSTIC ALARM TRANSMITTER FOR A DANGER WARNING.
DE50106265T DE50106265D1 (en) 2001-12-01 2001-12-01 Acoustic alarm device for a hazard alarm
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 EP1316931A1 (en) 2003-06-04
EP1316931B1 true EP1316931B1 (en) 2005-05-18

Family

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

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

Cited By (1)

* Cited by examiner, † Cited by third party
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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1666166A1 (en) * 2004-12-01 2006-06-07 Asulab S.A. method for generating polyphone sound

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH654169GA3 (en) * 1984-04-25 1986-02-14
US4954960A (en) * 1986-11-07 1990-09-04 Alcon Laboratories Linear power control for ultrasonic probe with tuned reactance
IT9004965U1 (en) * 1990-12-07 1992-06-08 G P B Beghelli S R L Ora Begnelli S R L IMPROVEMENT IN INDEPENDENT EMERGENCY LIGHTING SYSTEMS WITH FIRE, HARMFUL GAS, AIR POLLUTION INDICATORS AND SIMILAR
FR2732805B1 (en) * 1995-04-05 1997-06-20 Klaxon Sa PIEZOELECTRIC SOUND WARNING DEVICE, PARTICULARLY FOR VEHICLE EQUIPMENT
US6339377B1 (en) * 1998-11-24 2002-01-15 Kojin Co., Ltd. Article surveillance security system with self-alarm

Cited By (1)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
EP1316931A1 (en) 2003-06-04
PT1316931E (en) 2005-09-30
ES2242701T3 (en) 2005-11-16
ATE295981T1 (en) 2005-06-15
DE50106265D1 (en) 2005-06-23

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