EP1793353B1 - Verfahren zur Detektion beim Warmlauf eines Bewegungsmelders und Vorrichtung zur Durchführung des Verfahrens - Google Patents

Verfahren zur Detektion beim Warmlauf eines Bewegungsmelders und Vorrichtung zur Durchführung des Verfahrens Download PDF

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Publication number
EP1793353B1
EP1793353B1 EP20060301181 EP06301181A EP1793353B1 EP 1793353 B1 EP1793353 B1 EP 1793353B1 EP 20060301181 EP20060301181 EP 20060301181 EP 06301181 A EP06301181 A EP 06301181A EP 1793353 B1 EP1793353 B1 EP 1793353B1
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EP
European Patent Office
Prior art keywords
phase
detection
amplification
filtering
stage
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EP20060301181
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English (en)
French (fr)
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EP1793353A1 (de
Inventor
Vincent Woelffel
Pascal Sauer
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Hager Controls SAS
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Hager Controls SAS
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Priority claimed from FR0553676A external-priority patent/FR2894361A1/fr
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    • 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
    • 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
    • G08B29/185—Signal analysis techniques for reducing or preventing false alarms or for enhancing the reliability of the system

Definitions

  • the present invention relates to the field of equipment for automation of comfort in homes and the tertiary sector, namely in particular light, heating, air conditioning and alarm, in particular motion sensors based on passive infrared sensors. and relates to a start-up detection method for such detectors.
  • the invention also relates to a device for implementing this method.
  • the sensors of the detectors of this type generally have an amplification chain, whose output voltage stabilization time, after small power mains interruptions, namely of the order of 200 ms, may vary. between ten and thirty seconds. It follows that after such a break the detection is inhibited during a fixed time delay and it is necessary to wait at least thirty seconds before being able to detect a movement again.
  • the pyroelectric sensors used in these detectors generate an electric charge in response to a temperature variation and their output signal, which is representative of a movement, results in a very small voltage variation, namely the order of a few microvolts, so that a large amplification of this signal is necessary to allow its treatment.
  • the delays are generally set to 30 seconds, or even 1 minute, so that the detector reacts only at the end of the delay. It follows that, whatever the duration of the cut-off and, in particular, in the case of a micro-break, the control of the apparatus connected to the detector can be carried out only after the end of the entire duration of delay.
  • the present invention which is defined by the claims, is intended to overcome the disadvantages of existing devices by providing a method of detection at startup for such detectors, which allows to significantly reduce the duration of inhibition of detection after a cut short-term current, without incurring additional cost for the realization of these.
  • the subject of the invention is also a device adapted for implementing this method, characterized in that it consists of a detector comprising at least one infrared sensor and an amplification and filtering stage of the output signal of each infrared sensor and by an auxiliary control and control unit, connected to a power supply.
  • FIG. 1 The accompanying drawings show, by way of example, an operating flow chart of a motion detector for triggering a lighting, alarm or other device 4, 5, based on at least one infrared sensor. 1 (cf. Fig. 5 ), implementing the start-up detection method according to the invention, essentially comprising an initialization phase A and a detection phase B.
  • the detector at startup, after a short-term power failure , the detector is in an initialization or charging phase, during which detection is inhibited, a charge too low preventing said detection.
  • the duration of the initialization phase or load depends on the cut-off time and is proportional to the cut-off time. Indeed, to date, to account with certainty of this variable and poorly controlled charging time, it is expected not to take into account detection signal for a period much longer than a maximum estimated duration of charge.
  • the method according to the invention which is implemented by means of a device as represented in FIG. figure 5 appended drawings and which essentially comprises an initialization phase A of the detector 1 of a stage 2 for amplifying and filtering the signals at the output of each infrared sensor 1, in particular comprising capacitors C3 and C5 and being connected to a unit 3 control and control of the lighting device, alarm or other 4, 5, and a detection phase B consecutive to said initialization phase A, the initialization phase A comprising a charging phase C and a phase S load stabilization and safety.
  • This method is characterized in that it essentially consists in setting, during the initialization phase A, an inhibition phase I of the detection signal, whose duration is determined by the control and control unit 3 from power up and is less than the maximum duration of charge phase C.
  • the method may consist, after the inhibition phase I and during the initialization phase A, of delivering a detection authorization AD following the reception of a first detection signal from the control unit 3 and control corresponding to a crossing of a predetermined lower voltage threshold TB.
  • the inhibition phase I may comprise an initial transient phase D of a duration of the order of one second, taking into account the transient phenomena at startup, and a delay phase T of the order of 3 to 8 seconds .
  • the method may consist in inhibiting the detection, at the beginning of the initialization phase A, by predicting an initial transient phase D of the order of one second corresponding notably to the start of the infrared sensor 1, and then by embodiment a short delay T, namely of the order of a few seconds, corresponding to the polarization of operational amplifiers 7 and 8, periods during which the signal is not analyzed.
  • the operational amplifiers 7 and 8 will be described later with regard to the figure 5 .
  • the method according to the invention may also consist in performing an automatic switchover in the detection phase B at the end of the initialization phase A.
  • Inhibition phase 1 ends in T1 on the chronograms of Figures 2 and 3 attached drawings.
  • the charging of the capacitors C3 to C6, also described below in connection with the figure 5 continues beyond T1, until a rest voltage VR is reached and the initialization is considered as definitively acquired (as described below), after a predetermined duration T2 set by delay, for example at 30 seconds and corresponding to the end of the initialization phase A after which the automatic switching to the normal detection phase B is performed.
  • the amplification chain of the charging circuit delivers at its output a saturation signal corresponding to a maximum voltage.
  • the method may, after the issuance of the detection authorization AD, provide an actuation signal of an auxiliary 4, 5 via the control and control unit 3 in the two following cases: the crossing of a predetermined upper voltage threshold TH and a new passage of the detection signal below the lower voltage threshold TB.
  • the thresholds of higher voltage TH and lower TB can be established empirically taking into account, in particular, disturbances due to drafts, temperature fluctuations, electromagnetic waves, etc .
  • the chronogram of the figure 4 The accompanying drawings show the operation of the detector in normal detection situation B.
  • the state of the latter will be constantly monitored and, if the signal varies beyond thresholds above TH and lower TB predetermined, this variation is necessarily due to a signal from the infrared sensor 1, and not to a phenomenon related to the power, and a command of an auxiliary 4, 5 is issued.
  • the figure 1 representing the flow diagram of a motion detector based on passive infrared sensors implementing the method according to the invention more explicitly describes the various steps of the latter.
  • the method starts with an inhibition phase I, comprising an initial transient phase D and a delay phase T, and ending at T1.
  • this inhibition phase I the detection signal is not taken into account, the detection being inhibited.
  • any detection causing a signal large enough to cross the lower voltage threshold TB will result in a detection authorization AD issued by the control and control unit 3 (branch located on the right in the upper part of the org).
  • the detector is considered capable of detecting, so that the subsequent reception of a signal crossing the higher voltage threshold TH or again the lower voltage threshold TB can be considered as a signal of detection of a presence.
  • the first detection realizes a condition from which a signal crossing the higher voltage thresholds TH or lower TB corresponds to the detection of a presence.
  • the process proceeds to the detection phase B.
  • a single crossing of a higher threshold voltage TH or a lower threshold voltage TB is sufficient to determine a presence detection (cf. Fig. 4 ).
  • the method according to the invention therefore makes it possible to reduce the inhibition phase of the detection by determining, after a reduced delay of the signal inhibition (phase I), a condition from which it can be considered that any signal crossing a predefined threshold corresponds to a presence detection signal.
  • this condition can occur during the initialization phase, but after the inhibition phase I shortened.
  • the device for implementing this method is represented at figure 5 of the accompanying drawings and is constituted by a detector comprising at least one infrared sensor 1 and a stage 2 for amplifying and filtering the output signal of each infrared sensor 1 and by a unit 3 for controlling and controlling auxiliaries 4, 5, connected to a power supply 6.
  • Stage 2 of amplification and filtering of the output signal of the infrared sensor 1, shown in FIG. figure 5 appended drawings, is essentially constituted by two operational amplifiers 7 and 8, cascaded, the first, 7, is used in non-inverter mounting with resistors R3 and R4 ensuring a filtering, respectively low frequencies and high frequencies, the second operational amplifier 8 being used in inverter assembly with resistors R5 and R6 also ensuring, respectively, a filtering of low frequencies and high frequencies.
  • the stage 2 for amplifying and filtering the output signal of the infrared sensor 1 comprises a band-pass filter, the low-pass filter of which consists of capacitors C3 and C5 associated with the resistors R3 and R5 and whose the high-pass filter is constituted by the resistors R4 and R6 associated with capacitors C4 and C6.
  • This bandpass filter is intended to mitigate the effects of the environment on the infrared sensor 1, such as temperature fluctuations, drafts, radio waves, etc ..., to avoid erroneous detections.
  • the band-pass filter amplifies only the previously selected representative frequencies, ie, for example, of a human body, which are generally between 0.1 Hz and 10 Hz.
  • the filtering of the signal coming from the sensor 1 is therefore carried out using the assembly based on the operational amplifiers 7 and 8 and the low-pass and high-pass filters formed by the capacitors C3 and C5 associated with the resistors R3 and R5 and by the capacitors C4 and C6 associated with the resistors R4 and R6.
  • the infrared sensor 1 of known type, generates an electric charge in response to a temperature variation and its output signal is representative of a movement and is in the form of a very low voltage, namely of a few hundred microvolts, and it is therefore necessary to broadly amplify this signal for processing through the control unit 3 and ordered. For this purpose high resistance and capacitor values are required.
  • the cut-off frequency of the low-pass filter of the amplification and filtering stage 2 of the output signal of each infrared sensor 1 is advantageously set to about 1 Hz and the cut-off frequency of the high-pass filter of said amplification and filtering stage 2 at about 10 Hz.
  • control and control unit 3 may be a microcontroller.
  • Auxiliaries 4 and 5 are advantageously in the form of a light alarm or lighting 4 and a signaling means 5, for example consisting of light-emitting diodes indicating the operating state of the detector.
  • a signaling means 5 for example consisting of light-emitting diodes indicating the operating state of the detector.
  • control and control unit 3 is connected to adjustment means 9 and 10, for example of the light level and of the lighting threshold of a light alarm or lighting 4, as well as of a device 11 for adjusting the delay and a switch 12 forcing or manual control.
  • control and control unit 3 can be connected to other auxiliaries such as heating and air-conditioning means, as well as to additional means of specific adjustment of the auxiliary control level.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Burglar Alarm Systems (AREA)

Claims (5)

  1. Verfahren zur Detektion beim Anlaufen eines Bewegungsmelders nach Unterbrechung des Netzstromes zum Auslösen einer Beleuchtungs-, Alarmeinrichtung oder sonstigen Einrichtung (4, 5) mit mindestens einem Infrarot-Sensor (1),
    wobei die Ausgangssignale jedes Infrarot-Sensors (1) einer Verstärkungs- und Filterstufe (2) übertragen werden, die insbesondere Kondensatoren (C3 und C5) umfasst, und wobei diese Verstärkungs- und Filterstufe (2) mit einer Kontroll- und Steuereinheit (3) der Beleuchtungs-, Alarmeinrichtung oder sonstigen Einrichtung (4, 5) verbunden ist,
    wobei dieses Verfahren im Wesentlichen aus einer Initialisierungsphase (A) des Detektors und der Verstärkungs- und Filterstufe (2) und aus einer Detektionsphase (B) im Anschluss an diese Initialisierungsphase (A) besteht, und wobei die Initialisierungsphase (A) eine Ladephase (C) und eine Ladungsstabilisierungs- und Sicherheitsphase (S) umfasst,
    dadurch gekennzeichnet, dass das Verfahren im Wesentlichen darin besteht, während der Initialisierungsphase (A) eine Sperrphase (I) des Detektionssignals vorzusehen, deren Dauer durch die Kontroll- und Steuereinheit (3) ab dem Unterspannungsetzen bestimmt wird und unter der Maximaldauer der Ladephase (C) liegt, wobei diese Sperrphase (I) eine einleitende Übergangsphase (D) von etwa einer Sekunde unter Berücksichtigung der Störgrößen beim Anlaufen und eine Verzögerungsphase (T) von etwa 3 bis 8 Sekunden umfasst,
    und, nach der Sperrphase (I) und während der Initialisierungsphase (A), eine Detektionsfreigabe (AD) nach dem Empfang eines ersten Detektionssignals durch die Kontroll- und Steuereinheit (3), der einer Unterschreitung einer vorab festgelegten, unteren Spannungsgrenze (TB) entspricht, zu erteilen, und, nach der Erteilung der Detektionsfreigabe (AD), ein Betätigungssignal einer Hilfseinrichtung (4, 5) durch die Kontroll- und Steuereinheit (3) in folgenden zwei Fällen abzugeben: bei der Überschreitung einer vorab festgelegten oberen Spannungsgrenze (TH) und bei einem neuerlichen Abfall des Detektionssignals unter die untere Spannungsgrenze (TB).
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass es darin besteht, eine automatische Umschaltung in die Detektionsphase (B) am Ende der Initialisierungsphase (A) auszuführen.
  3. Vorrichtung, welche geeignete Mittel zur Durchführung des Verfahrens nach einem der Ansprüche 1 und 2 umfasst, dadurch gekennzeichnet, dass diese aus einem Detektor, der zumindest einen Infrarot-Sensor (1) und eine Verstärkungs- und Filterstufe (2) für das Ausgangssignal jedes Infrarot-Sensors (1) umfasst, welche insbesondere einen Tiefpassfilter und einen Hochpassfilter umfasst, und aus einer Kontroll- und Steuereinheit (3) von Hilfseinrichtungen (4, 5), die mit einer Stromversorgung (6) verbunden ist, besteht.
  4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die Grenzfrequenz des Tiefpassfilters der Verstärkungs- und Filterstufe (2) für das Ausgangssignal jedes Infrarot-Sensors (1) auf etwa 1 Hz und die Grenzfrequenz des Hochpassfilters dieser Verstärkungs- und Filterstufe (2) auf etwa 10 Hz festgelegt ist.
  5. Vorrichtung nach einem der Ansprüche 3 und 4, dadurch gekennzeichnet, dass die Kontroll- und Steuereinheit (3) ein Mikrocontroller ist.
EP20060301181 2005-12-01 2006-11-24 Verfahren zur Detektion beim Warmlauf eines Bewegungsmelders und Vorrichtung zur Durchführung des Verfahrens Active EP1793353B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0553676A FR2894361A1 (fr) 2005-12-01 2005-12-01 Procede de detection au demarrage pour un detecteur de mouvements et dispositif pour la mise en oeuvre de ce procede
FR0610081A FR2894362B1 (fr) 2005-12-01 2006-11-17 Procede de detection au demarrage pour un capteur de mouvements et dispositif pour la mise en oeuvre de ce procede

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EP1793353A1 EP1793353A1 (de) 2007-06-06
EP1793353B1 true EP1793353B1 (de) 2009-06-24

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DE (1) DE602006007420D1 (de)
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JP3656927B2 (ja) * 1996-09-09 2005-06-08 アツミ電氣株式会社 熱線センサの増幅回路
US7161152B2 (en) * 2003-12-16 2007-01-09 Robert Bosch Gmbh Method and apparatus for reducing false alarms due to white light in a motion detection system

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FR2894362A1 (fr) 2007-06-08
FR2894362B1 (fr) 2009-11-20
DE602006007420D1 (de) 2009-08-06
EP1793353A1 (de) 2007-06-06

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