EP0137337B1 - Meldeanlage mit drahtloser Signalübertragung zwischen einer batteriebetriebenen Unterstation und einer netzbetriebenen Hauptstation - Google Patents

Meldeanlage mit drahtloser Signalübertragung zwischen einer batteriebetriebenen Unterstation und einer netzbetriebenen Hauptstation Download PDF

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Publication number
EP0137337B1
EP0137337B1 EP84110885A EP84110885A EP0137337B1 EP 0137337 B1 EP0137337 B1 EP 0137337B1 EP 84110885 A EP84110885 A EP 84110885A EP 84110885 A EP84110885 A EP 84110885A EP 0137337 B1 EP0137337 B1 EP 0137337B1
Authority
EP
European Patent Office
Prior art keywords
battery
alarm
alarm system
operated
transmitter
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
Application number
EP84110885A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0137337A2 (de
EP0137337A3 (no
Inventor
Günter Dipl.-Ing. Haefele
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to AT84110885T priority Critical patent/ATE31832T1/de
Publication of EP0137337A2 publication Critical patent/EP0137337A2/de
Publication of EP0137337A3 publication Critical patent/EP0137337A3/xx
Application granted granted Critical
Publication of EP0137337B1 publication Critical patent/EP0137337B1/de
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/18—Prevention or correction of operating errors
    • G08B29/181—Prevention or correction of operating errors due to failing power supply

Definitions

  • the invention relates to a signaling system with at least one battery-operated substation with a detector and a transmitter coupled thereto for wireless signal transmission to a receiver of a main station, the substation containing a battery monitoring stage that transmits a signal when activated.
  • Such a signaling system is known from US-PS 4056815.
  • the substation sends high-frequency signals that are modulated with a first frequency when the detector has responded and that are modulated with a second frequency that differs from the first when the battery monitoring has responded.
  • this arrangement has the disadvantage that approximately the same power is consumed for battery monitoring as for the transmission of an alarm signal. Since the battery monitor must be in constant operation, this results in a considerable load on the battery and thus a reduced service life.
  • alarm signals and battery monitoring signals can only be distinguished using relatively complex frequency filters.
  • a signaling system with a mains-operated substation and a mains-operated main station is known from the “Jung Multifon, house information technology” brochure.
  • the signal is transmitted without a separate line via the network with a modulated carrier. Problems can arise during subsequent installation if there is no socket available near a substation. In fire alarm systems, for example, the sensor often has to be placed on the ceiling or on a wall of a living room. The lines then required from the substation to the main station are generally very disruptive.
  • the object of the invention is therefore to design a signaling system of the type mentioned at the outset without a line connection to the substation, while at the same time providing a high level of reliability, in such a way that the battery required for the substation is loaded as little as possible and both the transmitter and the receiver are simple to set up.
  • the transmitter sends a continuous signal when the detector has responded, in that the transmitter sends short pulses at periodic intervals when the battery monitoring stage has not responded and in that the main station is mains-operated.
  • the battery and the functionality of the signal connection are constantly monitored so that the required high transmission security is guaranteed. Due to the short pulses triggered by the battery monitoring level, the battery is only slightly loaded. Both the continuous signal when the detector responds and the short pulses at periodic intervals when the battery monitor responds are easy to implement and can also be easily distinguished in the reception level.
  • the signal can be transmitted with infrared light, ultrasound or high-frequency waves.
  • the transmitter can have a multivibrator with a blocking input, the blocking input being controlled by the battery monitoring stage and the detector.
  • the receiver of the main station advantageously has a rectifier with a diode in a longitudinal branch and a capacitor in a transverse branch, to which a first Schmitt trigger for battery monitoring and a second Schmitt trigger for triggering a message are connected, the time constant of the rectifier being so dimensioned is that the short pulses are enough to trigger the first Schmitt trigger.
  • the main station can contain a counter which is controlled by a clock generator and is reset by the first Schmitt trigger, the counter triggering a battery alarm if its counter reading exceeds a predetermined value, this predetermined value and the clock frequency of the clock generator being set such that the meter reading is not reached as long as the substation sends the short pulses. Battery monitoring is thus implemented using simple means.
  • An integrator can be inserted between the rectifier and the second Schmitt trigger.
  • the time constant of this integrator is used to determine the length of time from which signals are evaluated as signal signals.
  • an alarm transmitter in which an alarm signal triggers a pulse train which switches the alarm transmitter on accordingly.
  • the distance between the pulses decreases and the alarm signal becomes more intense.
  • the intervals between the pulses can completely disappear and a continuous output voltage can be emitted for a short period of time if the alarm situation is particularly critical.
  • a battery monitoring device which likewise causes a pulse train to be generated at the output, but in this case the pulse interval is relatively long in order to keep the power consumption as low as possible in the event of an alarm message triggered by the battery voltage being too low.
  • FIG. Schematically shows the structure of an alarm system.
  • a substation A is in wireless connection with a main station B assigned to it.
  • the signals received by the main station B are forwarded to a central station C which is generally common to several main stations and which, for example, triggers a message.
  • the signal transmission between main station B and central station C can be done in any way partially done, for example, by modulated signals via the power grid.
  • a detector 1 is constructed from a sensor 1a, which can be, for example, an ultrasonic sensor for motion detection, and from a converter 1b. As soon as the sensor 1 a e.g. responding to a movement, there is a «1» signal at the output of detector 1.
  • a battery monitoring stage contains a comparator 2a, at whose inverting input a reference voltage U ref and at whose non-inverting input the battery voltage is present.
  • a clock generator 2b is connected downstream of the comparator, which, for example, sends a short pulse of 20 ms duration every minute as long as there is a "1" signal at its input. These short pulses are therefore sent as long as the voltage of the battery 3 is higher than the reference voltage U ref .
  • the reference voltage U rst is set so that the battery voltage is sufficient to supply the substation with sufficient certainty as long as it is above this reference voltage U rst .
  • the outputs of the clock generator 2b and the signal converter 1b are each connected to an input of a NOR gate 4, the output of which is connected to a blocking input of a multivibrator 5.
  • the multivibrator 5 generates the control voltage for the infrared light-emitting diode 8, provided that no “1” signal is present at its blocking input.
  • the multivibrator 5 then vibrates when either the detector 1 has responded or the battery monitoring circuit emits a short pulse.
  • the output signal of the multivibrator 5 is fed via a resistor 7 to the base of a transistor 6, in the emitter path of which there is an infrared light-emitting diode 8.
  • This infrared light-emitting diode 8 serves as a transmitter. It sends a continuous signal when sensor 1 a has responded and short pulses as long as the battery voltage is above the reference voltage U ref .
  • the infrared light emitted by the infrared light-emitting diode 8 is received with the infrared photodiode 9 in the main station B and amplified with a downstream amplifier 11.
  • a bandpass filter 12 which is tuned to the frequency of the transmitted infrared light and which is connected downstream of the amplifier 11, interference signals of a different frequency are eliminated.
  • the output of the bandpass filter 12 is connected via a diode 13a to a first connection of a capacitor 13b, the second connection of which is connected to ground. This rectifies and smoothes the received signal.
  • the signal present at the capacitor 13b is fed to an integrator 15.
  • This consists of an operational amplifier 15a, which has a feedback capacitor 15c between the output and the inverting input.
  • the inverting input is connected to the capacitor 13b via a resistor 15b.
  • a Schmitt trigger 16 is connected downstream of the integrator 15. The response threshold of the Schmitt trigger 16 is only reached when the input signal is present for so long that the integrator 15 reaches a sufficient output voltage. This distinguishes continuous signals that should lead to a message from short-term signals.
  • the Schmitt trigger 16 therefore delivers a “1” signal at its output when the detector 1 has responded.
  • the capacitor 13b is also connected to the reset input of a counter 17 via a second Schmitt trigger 14.
  • the time constant predetermined by the internal resistance of the bandpass filter 12 and the capacitance of the capacitor 13b is dimensioned such that the short pulses triggered by the battery monitoring are sufficient to trigger the Schmitt trigger 14.
  • the clock input of the counter 17 is connected to a clock generator 18.
  • a “1” signal is present at an output of counter 17.
  • this counter reading and the clock frequency of the clock generator 18 are dimensioned such that the counter 17 is reset again and again via the Schmitt trigger 14 by the short pulses triggered by the battery monitoring circuit before it reaches the predetermined counter reading.
  • a «1» signal is therefore only present at the output of counter 17 if the short pulses triggered by the battery monitoring are absent, i.e. either the battery voltage becomes too low or the transmission path is interrupted.
  • a “1” signal is therefore present at the output of counter 17 if there is a fault in the signaling system, while a signal is present at the output of Schmitt trigger 16 when the detector has responded. Both signals can be linked via an OR gate 19 and fed to an alarm device.
  • the further transmission, for example from the main station B to a central station can e.g. by carrier frequency modulation via a mains cable.
  • the signaling system described is therefore easy to install, since no connecting lines are required for the substation. At the same time, a high level of operational reliability is maintained since both the battery 3 of the substation A and the transmission path to the main station are constantly monitored.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Alarm Systems (AREA)
  • Selective Calling Equipment (AREA)
  • Transmitters (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Circuits Of Receivers In General (AREA)
  • Communication Control (AREA)
  • Emergency Alarm Devices (AREA)
EP84110885A 1983-09-26 1984-09-12 Meldeanlage mit drahtloser Signalübertragung zwischen einer batteriebetriebenen Unterstation und einer netzbetriebenen Hauptstation Expired EP0137337B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84110885T ATE31832T1 (de) 1983-09-26 1984-09-12 Meldeanlage mit drahtloser signaluebertragung zwischen einer batteriebetriebenen unterstation und einer netzbetriebenen hauptstation.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833334820 DE3334820A1 (de) 1983-09-26 1983-09-26 Meldeanlage mit drahtloser signaluebertragung zwischen einer batteriebetriebenen unterstation und einer netzbetriebenen hauptstation
DE3334820 1983-09-26

Publications (3)

Publication Number Publication Date
EP0137337A2 EP0137337A2 (de) 1985-04-17
EP0137337A3 EP0137337A3 (no) 1985-06-19
EP0137337B1 true EP0137337B1 (de) 1988-01-07

Family

ID=6210116

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84110885A Expired EP0137337B1 (de) 1983-09-26 1984-09-12 Meldeanlage mit drahtloser Signalübertragung zwischen einer batteriebetriebenen Unterstation und einer netzbetriebenen Hauptstation

Country Status (4)

Country Link
EP (1) EP0137337B1 (no)
AT (1) ATE31832T1 (no)
DE (2) DE3334820A1 (no)
NO (1) NO160634C (no)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11684015B2 (en) 2019-08-07 2023-06-27 Cnh Industrial America Llc Agricultural baling system with controlled tractor steering to balance bale density

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0253156A1 (de) * 1986-06-25 1988-01-20 Siemens Aktiengesellschaft Einbruchmeldeanlage
GB8701202D0 (en) * 1987-01-20 1987-02-25 Wakefield Health Authority Infra-red personal attack alarm system
FI85632C (fi) * 1990-04-20 1992-05-11 Salora Myynti Oy Fjaerrstyrd underhaollningselektronikanordning.
GB2247095B (en) * 1990-07-27 1994-08-03 Tensator Ltd An alarm system for a barrier
DE4024821A1 (de) * 1990-08-04 1992-02-06 Koettgen Gmbh & Co Kg Kleinsender-kontrolle
NL1005096C2 (nl) * 1997-01-27 1998-07-29 Estafette B V Werkwijze voor het testen van de werking van een zender/ontvanger-combinatie voor bewakingsdoeleinden alsmede een zender/ontvanger-combinatie.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3778800A (en) * 1971-04-09 1973-12-11 Statitrol Corp Self-monitoring battery operated circuit
FR2339218A1 (fr) * 1976-01-20 1977-08-19 Charbonnages Ste Chimique Installation de surveillance a distance de personnes
US4056815A (en) * 1976-02-03 1977-11-01 Westinghouse Electric Corporation Battery operated transmitter circuit
US4219806A (en) * 1978-09-15 1980-08-26 American District Telegraph Company Dual alarm gas detector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11684015B2 (en) 2019-08-07 2023-06-27 Cnh Industrial America Llc Agricultural baling system with controlled tractor steering to balance bale density

Also Published As

Publication number Publication date
NO160634C (no) 1989-05-10
EP0137337A2 (de) 1985-04-17
NO160634B (no) 1989-01-30
DE3334820A1 (de) 1985-04-04
NO843830L (no) 1985-03-27
ATE31832T1 (de) 1988-01-15
EP0137337A3 (no) 1985-06-19
DE3468565D1 (en) 1988-02-11

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