EP0218011B1 - Schaltungsanordnung für einen Infrarot-Raumüberwachungs-Detektor - Google Patents

Schaltungsanordnung für einen Infrarot-Raumüberwachungs-Detektor Download PDF

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Publication number
EP0218011B1
EP0218011B1 EP86108701A EP86108701A EP0218011B1 EP 0218011 B1 EP0218011 B1 EP 0218011B1 EP 86108701 A EP86108701 A EP 86108701A EP 86108701 A EP86108701 A EP 86108701A EP 0218011 B1 EP0218011 B1 EP 0218011B1
Authority
EP
European Patent Office
Prior art keywords
detector
circuit layout
operational amplifier
layout according
operating voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP86108701A
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German (de)
English (en)
French (fr)
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EP0218011A1 (de
Inventor
Hermann Dipl.-Ing. Zierhut
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.)
Hirschmann Electronics GmbH and Co KG
Original Assignee
Hirschmann Electronics GmbH and Co KG
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Filing date
Publication date
Application filed by Hirschmann Electronics GmbH and Co KG filed Critical Hirschmann Electronics GmbH and Co KG
Publication of EP0218011A1 publication Critical patent/EP0218011A1/de
Application granted granted Critical
Publication of EP0218011B1 publication Critical patent/EP0218011B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/19—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using infrared-radiation detection systems
    • G08B13/191—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using infrared-radiation detection systems using pyroelectric sensor means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S250/00—Radiant energy
    • Y10S250/01—Passive intrusion detectors

Definitions

  • the invention relates to a circuit arrangement for an infrared room surveillance detector having a pyro element as a sensor, the circuit arrangement being operated in the current operating mode and having an operational amplifier, the output signal of which is fed to a threshold value comparator stage.
  • Detector circuits which are used in connection with pyro-elements serving as infrared sensors are usually detectors which are operated in the voltage mode. Such detectors in the voltage mode have a high impedance, which is required for the further processing of the detector output signal, for example in a threshold value comparator stage.
  • the disadvantage of these detectors operating in the voltage mode is, however, that the sensitivity of the detector leaves something to be desired, and in particular the gain of the detector decreases towards higher frequencies; this means that the gain and thus the output voltage change depending on the frequency.
  • the invention is therefore based on the object of providing a circuit arrangement for an infrared detector which has a high sensitivity and a low level of noise, has a constant amplification over a relatively wide frequency range and is nevertheless high-impedance.
  • the measures according to the invention result in the possibility of using a detector which operates in the current operating mode in connection with a pyro element, the detector having a high impedance and yet being highly sensitive and low-noise, and having a uniform amplification over a relatively wide frequency range having.
  • the inventor made investigations with detectors of various types, which should be used in connection with pyro elements for infrared room protection surveillance.
  • the feedback resistance of the operational amplifier is chosen to be high and preferably in a range from 10 "to 10 ' 2 ohms.
  • Another embodiment of the invention is characterized in that the comparator stage is integrated in the detector housing. In this way, the detector becomes even less sensitive to interference and its electromagnetic compatibility is increased.
  • An embodiment of the present invention consists in that a blocking diode or a transistor connected as a blocking diode is provided between the minus terminal of the operating voltage source and the reference voltage output, and between the latter and the plus terminal of the operating voltage source.
  • Static charges which can occur in particular during the manufacturing process, result in high voltage peaks, so-called spikes, which reach the operational amplifier and, if the diodes are not present, can destroy the latter, particularly if it is a CMOS operational amplifier.
  • the provision of the diodes prevents this.
  • the diodes or transistors designed as blocking diodes are preferably accommodated within the detector housing.
  • a blocking diode or a transistor connected as a blocking diode only between the minus terminal of the operating voltage source and the reference voltage output, which transistor is arranged within the detector housing.
  • a resistor is provided between the reference voltage output and the plus terminal of the operating voltage source, which is located outside the detector housing.
  • the diode or diodes are a Zener diode or Zener diodes, or transistors connected as Zener diodes. If, in addition, according to a further embodiment of the invention, the operating voltages are supplied via a series resistor, the use of Zener diodes results in additional operating voltage stabilization, for which no further components or measures are required.
  • the measure can be advantageous to ground the minus terminal of the operating voltage source and to supply only the positive operating voltage via a series resistor.
  • the aim of a detector used in connection with infrared sensors is to have a substantially constant gain over the operating frequency range. As can be seen from FIG. 1, this requirement cannot be met with a detector operating in the voltage operating mode.
  • the gain characteristic of a detector operating in the current operating mode has a straightforward gain characteristic curve over a relatively wide range towards higher frequencies, i. H. constant gain over a relatively wide frequency range, so that a detector for the current mode of operation is much more suitable, particularly in this regard.
  • a detector operating in the current mode does not have a sufficiently high impedance, so that an impedance converter must be provided in the detector circuit.
  • Fig. 2 shows such a detector operating in the current mode with an impedance converter.
  • FET field effect transistor
  • the source electrode of the FET 2 is connected via a resistor R i to ground or at the negative pole of the operating voltage source and directly at the negative input of an operational amplifier 3, at the positive input of which the reference voltage U Ref is present.
  • a feedback resistor R R is connected between the gate electrode of the FET 2 and the output of the operational amplifier 3.
  • the output signal of the operational amplifier 3 is fed to a further circuit part, for example a threshold value comparator stage for signal evaluation.
  • the impedance converter arranged in front of the amplifier in the form of a junction FET 2 has the disadvantage that the voltage noise of this FET is fully included in the signal to be evaluated.
  • the voltage noise of the FET is significantly caused by the ohmic reaction conductance acting between the drain electrode and the gate electrode.
  • FIG. 3 shows an exemplary embodiment of a circuit arrangement according to the invention for a detector used in connection with a pyro element.
  • the pyro element 1 has one connection directly at the minus input of an operational amplifier 3 and with its other connection directly at the plus Input of the operational amplifier 3. Between the output and the minus input of the operational amplifier 3 there is a feedback resistor R ⁇ .
  • the output signal of the operational amplifier is the detector signal A to be evaluated in the further circuit arrangement, which is fed to a threshold value comparator stage 4, for example.
  • the operating voltages + U B and - U B are fed to the operational amplifier 3.
  • the detector housing is indicated by reference number 5. It contains the circuit parts of the detector circuit which have been described so far and which are essentially protected by the housing 5 against external interference.
  • the reference voltage U Ref is preferably chosen such that it lies approximately in the middle of the modulation range of the output voltage of the operational amplifier, which corresponds to approximately half the operating voltage when using CMOS operational amplifiers, which - as mentioned - are particularly suitable.
  • the reference voltage U ref via a the feedback resistor R R corresponding resistor R 'R is taken from the operational amplifier 3 used and led out of the detector housing 5.
  • the operational amplifier experiences practically no load because the resistor R 'has a high resistance.
  • diodes D 1 and D 2 can be used, which are provided in the circuit arrangement in the manner shown in FIG. 3.
  • the anode of a diode D is connected to the negative terminal - U B of the operating voltage source, and its cathode is connected to the reference voltage output U Ref ; the latter is connected to the anode of a further diode D 2 , the cathode of which is connected to the positive terminal + U B of the operating voltage source.
  • These diodes serve to protect the components located in the detector housing, in particular the operational amplifier 3. Instead of the diodes, transistors switched as diodes can also be used.
  • the operating voltage - U B and + U B are supplied via resistors R 3 and R 4 . If Zener diodes are used as diodes D 1 and D 2 , the operating voltage is stabilized without additional circuitry complexity.
  • the threshold value comparator stage 4 which is used to evaluate the detector signal A, contains two comparators 6 and 7 in the form of operational amplifiers, the output signal A of the operational amplifier 3 being fed to the minus input of the comparator 6 and the plus input of the comparator 7.
  • the reference voltage U Ref is applied to the plus input of the comparator 6 or to the minus input of the comparator 7 via threshold value resistors R 1 and R 2 .
  • the threshold value compensation stage 4 can also be accommodated in the detector housing 5. In this way, this circuit part is also essentially shielded against external interference.
  • an operational amplifier 3 is preferably selected to have a constant no-load gain over the desired frequency range. If necessary, to the said ten operational amplifiers can also be connected in series. An idle gain in the useful range of 120 dB is useful. The compensation of the operational amplifier, ie the break point of the idle amplification, should be outside the useful range.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Amplifiers (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
EP86108701A 1985-08-09 1986-06-26 Schaltungsanordnung für einen Infrarot-Raumüberwachungs-Detektor Expired - Lifetime EP0218011B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3528646 1985-08-09
DE3528646A DE3528646C3 (de) 1985-08-09 1985-08-09 Schaltungsanordnung für einen Infrarot-Raumüberwachungsdetektor

Publications (2)

Publication Number Publication Date
EP0218011A1 EP0218011A1 (de) 1987-04-15
EP0218011B1 true EP0218011B1 (de) 1990-11-14

Family

ID=6278143

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86108701A Expired - Lifetime EP0218011B1 (de) 1985-08-09 1986-06-26 Schaltungsanordnung für einen Infrarot-Raumüberwachungs-Detektor

Country Status (3)

Country Link
US (1) US4795905A (enrdf_load_stackoverflow)
EP (1) EP0218011B1 (enrdf_load_stackoverflow)
DE (2) DE3528646C3 (enrdf_load_stackoverflow)

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DE3717369A1 (de) * 1987-05-22 1988-12-08 Hirschmann Radiotechnik Verfahren und vorrichtung zur raumueberwachung
US5309147A (en) * 1992-05-21 1994-05-03 Intelectron Products Company Motion detector with improved signal discrimination
US5280335A (en) * 1992-05-26 1994-01-18 The United States Of America As Represented By The Secretary Of The Navy Fiber-optical testing system having a detection circuit
US5330226A (en) * 1992-12-04 1994-07-19 Trw Vehicle Safety Systems Inc. Method and apparatus for detecting an out of position occupant
US5561412A (en) * 1993-07-12 1996-10-01 Hill-Rom, Inc. Patient/nurse call system
US5838223A (en) * 1993-07-12 1998-11-17 Hill-Rom, Inc. Patient/nurse call system
US5482314A (en) * 1994-04-12 1996-01-09 Aerojet General Corporation Automotive occupant sensor system and method of operation by sensor fusion
DE19619459C2 (de) * 1996-05-14 2000-06-08 Heimann Optoelectronics Gmbh Schaltung zur Erfassung elektromagnetischer Strahlung
DE19627999A1 (de) 1996-07-11 2016-05-04 Thomson-Csf Optisch selektiver Leistungsteiler mit großer Bandbreite
US6026340A (en) * 1998-09-30 2000-02-15 The Robert Bosch Corporation Automotive occupant sensor system and method of operation by sensor fusion
EP1665479A4 (en) 2003-08-21 2008-01-23 Hill Rom Services Inc PLUG AND RECEPTACLE HAVING WIRELESS AND WIRELESS COUPLING
US7319386B2 (en) 2004-08-02 2008-01-15 Hill-Rom Services, Inc. Configurable system for alerting caregivers
US7852208B2 (en) 2004-08-02 2010-12-14 Hill-Rom Services, Inc. Wireless bed connectivity
US20070072676A1 (en) * 2005-09-29 2007-03-29 Shumeet Baluja Using information from user-video game interactions to target advertisements, such as advertisements to be served in video games for example
US7868740B2 (en) 2007-08-29 2011-01-11 Hill-Rom Services, Inc. Association of support surfaces and beds
US8461968B2 (en) 2007-08-29 2013-06-11 Hill-Rom Services, Inc. Mattress for a hospital bed for use in a healthcare facility and management of same
US8082160B2 (en) 2007-10-26 2011-12-20 Hill-Rom Services, Inc. System and method for collection and communication of data from multiple patient care devices
US8169304B2 (en) 2008-02-22 2012-05-01 Hill-Rom Services, Inc. User station for healthcare communication system
US12251243B2 (en) 2008-02-22 2025-03-18 Hill-Rom Services, Inc. Distributed healthcare communication system
US8779924B2 (en) * 2010-02-19 2014-07-15 Hill-Rom Services, Inc. Nurse call system with additional status board
US9411934B2 (en) 2012-05-08 2016-08-09 Hill-Rom Services, Inc. In-room alarm configuration of nurse call system
US9314159B2 (en) 2012-09-24 2016-04-19 Physio-Control, Inc. Patient monitoring device with remote alert
US9830424B2 (en) 2013-09-18 2017-11-28 Hill-Rom Services, Inc. Bed/room/patient association systems and methods
US11123014B2 (en) 2017-03-21 2021-09-21 Stryker Corporation Systems and methods for ambient energy powered physiological parameter monitoring
US11911325B2 (en) 2019-02-26 2024-02-27 Hill-Rom Services, Inc. Bed interface for manual location
US12279999B2 (en) 2021-01-22 2025-04-22 Hill-Rom Services, Inc. Wireless configuration and authorization of a wall unit that pairs with a medical device
US12186241B2 (en) 2021-01-22 2025-01-07 Hill-Rom Services, Inc. Time-based wireless pairing between a medical device and a wall unit
CN115291552A (zh) * 2022-08-25 2022-11-04 山西省农业机械发展中心 一种带智能保护的叶轮控制系统

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US3657644A (en) * 1968-11-12 1972-04-18 Nasa Thermodielectric radiometer utilizing polymer film
GB1580403A (en) * 1977-04-19 1980-12-03 Philips Electronic Associated Pyroelectric detector circuits and devices
GB1551541A (en) * 1977-09-13 1979-08-30 Bloice J A Infrared intrusion detector system
US4149160A (en) * 1978-01-30 1979-04-10 Honeywell Inc. Multi-input signal comparator and indicator circuit
CH655591B (enrdf_load_stackoverflow) * 1980-10-06 1986-04-30
US4384207A (en) * 1981-01-23 1983-05-17 Eltec Instruments, Inc. Differential pyroelectric detector
JPS5922733A (ja) * 1982-07-29 1984-02-06 Kumi Kasei Kk 成形機の加工中断時における駆動モ−タ−の空転防止方法
JP3685555B2 (ja) * 1996-06-21 2005-08-17 ニチハ株式会社 屋根材の製造方法

Also Published As

Publication number Publication date
EP0218011A1 (de) 1987-04-15
DE3528646C2 (enrdf_load_stackoverflow) 1994-04-07
DE3528646A1 (de) 1987-02-19
DE3528646C3 (de) 1994-04-07
DE3675621D1 (de) 1990-12-20
US4795905A (en) 1989-01-03

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