WO2010100288A1 - Dispositif détecteur pour la détection optique d'un objet, en particulier détecteur de fumées - Google Patents

Dispositif détecteur pour la détection optique d'un objet, en particulier détecteur de fumées Download PDF

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Publication number
WO2010100288A1
WO2010100288A1 PCT/EP2010/052929 EP2010052929W WO2010100288A1 WO 2010100288 A1 WO2010100288 A1 WO 2010100288A1 EP 2010052929 W EP2010052929 W EP 2010052929W WO 2010100288 A1 WO2010100288 A1 WO 2010100288A1
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WO
WIPO (PCT)
Prior art keywords
light
sensor device
emitting diode
optical receiver
evaluation unit
Prior art date
Application number
PCT/EP2010/052929
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German (de)
English (en)
Inventor
Walter Vollenweider
Original Assignee
Siemens Aktiengesellschaft
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
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Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to DE112010000985T priority Critical patent/DE112010000985A5/de
Publication of WO2010100288A1 publication Critical patent/WO2010100288A1/fr

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]

Definitions

  • the present invention generally relates to the technical field of danger detection technology and, more particularly, to an energy-efficient control of light-emitting diodes, which can be used in particular in a danger detector.
  • the present invention relates to a sensor device for optically detecting an object by means of two light-emitting diodes as well as a hazard detector and a proximity sensor with such a sensor device operating according to the scattered-light principle.
  • Such optoelectronic hazard detectors typically include one or more light emitting diodes (LEDs for short) which emit light and one or more optical receivers which receive the light affected by the quantity to be detected.
  • the light emitting diode may e.g. also be semiconductor laser diodes.
  • the optical receivers are typically photodiodes or phototransistors.
  • the received signal is often very weak. The receiver is therefore sensitive to interference.
  • the received signal is substantially proportional to the light emitted by the transmitters. Thus, it would be desirable to emit as much light as possible. But these are limited by the available energy limits.
  • a hazard detector from batteries and / or batteries, as is the case in the case of wireless hazard detectors. Due to the limited performance of batteries and rechargeable batteries, low power consumption of the LEDs of a battery and / or battery-operated hazard alarm is important in order to keep the intervals for maintenance as long as possible.
  • the battery is replaced or the battery is charged.
  • the battery can be eg a 9V battery or a so-called E-block.
  • the operating voltage of the alarm system control panel is usually 24V (DC) and may drop to 16V due to the line resistance at the end of a long cable.
  • a current of only about 10OuA is usually allowed. The danger detectors must therefore work very energy-efficiently.
  • Light-emitting diodes emitting in the infrared range (IR) and commonly used in opto-electronic hazard detectors are operated at a forward voltage in the range of 1.6V.
  • UV-emitting diodes emitting ultraviolet light (UV) are operated at a forward voltage of approximately 4V.
  • a danger detector in a simple embodiment between the input-side DC supply voltage and the light-emitting diode to an element which limits the current flow.
  • the difference between the respective DC supply voltage and the forward voltage drops. In other words, depending on the DC supply voltage and forward voltage, the power loss can amount to a multiple of the electrical power of the relevant LED.
  • the present invention has for its object to provide a sensor device according to the scattered light principle, which can be simple, compact and inexpensive realized and which has a high efficiency and thus a low power consumption.
  • the sensor device provided for optically detecting an object has a circuit arrangement of two branches connected in parallel, each having a first light-emitting diode and a second light-emitting diode.
  • the light-emitting diodes are connected in anti-parallel to each other and set up to illuminate an object to be detected in a detection space.
  • not only one light emitting diode but also two or more light emitting diodes in the same flow direction may be connected in series and / or in parallel with each other.
  • the light-emitting diodes optionally combined with one another are preferably arranged relative to one another such that their emitted light beams overlap as possible and thus lead to intensive radiation.
  • the detection space can be formed in an optically closed measuring chamber.
  • a measuring chamber may be, for example, a so-called labyrinth.
  • the detection space may be in the "open" or be formed, so that Ambient light, such as ambient light, sunlight, pulsed light from fluorescent tubes, etc. can also penetrate into the detection space.
  • Ambient light such as ambient light, sunlight, pulsed light from fluorescent tubes, etc.
  • Such a detection space is typically found in so-called open fire detectors or proximity sensors.
  • the detection space is usually a few centimeters to a few decimeters away from the respective outer casing of the fire detector or proximity sensor.
  • the sensor device has a remote electrical connection, which is provided for feeding a DC voltage at least for the electrical supply of the circuit arrangement.
  • the sensor device can be connected directly to a battery and / or to a rechargeable battery. It may alternatively or additionally be connected via an external power supply line.
  • the DC voltage may also be derived from an AC voltage present on the input side of the sensor device, e.g. by means of a rectifier.
  • the sensor device has an inverter, which is connected on the input side to the DC voltage and on the output side to the circuit arrangement, and which provides an AC voltage converted from the DC voltage to alternately energize the LEDs.
  • the inverter has at least two clocked controllable switching elements, such as switching transistors on.
  • the inverter may, for example, have a buck converter. He may also have inductors and freewheeling diodes. It is essential that at the output of the inverter, an alternating voltage with a positive half-wave and with a negative half-wave with respect to a common with the circuit reference potential can be output.
  • the inverter can be set up such that the output of the two half-waves is separated in time from one another by a pause phase or follows one another directly.
  • the half-waves can eg a rectangular, triangular, have trapezoidal or sinusraumwellenförmige waveform.
  • the sensor device has an optical receiver which is set up to receive scattered light from the object to be detected, wherein the light of the two light-emitting diodes is scattered on the object.
  • the two light emitting diodes are arranged relative to one another and to the optical receiver such that no direct light from one of the light emitting diodes reaches the optical receiver.
  • the detection takes place according to the generally known forward scattering principle and / or according to the backward scattering principle.
  • a light-tight barrier between the light-emitting diode and the optical receiver can be provided.
  • the sensor device has an evaluation unit for evaluating a received signal originating from the optical receiver.
  • the level of the received signal is typically proportional to the amount of light impinging on the optical receiver.
  • an alarm signal can be output in the simplest case when a predetermined limit value is exceeded. It can also be an analogue current or voltage value corresponding to the received signal level or
  • Digital value are output, which images the received signal level.
  • the analog or digital output values may then be e.g. be evaluated by a signal or data technology with the sensor device in wireless and / or wired connection standing center.
  • the evaluation unit is preferably a microcontroller, ie a microprocessor-based data processing unit. It can alternatively be realized as an electronic circuit with analog and / or digital function blocks. In the case of a microcontroller, this analog-to-digital converter can be used for signal acquisition and / or digital / analogue conversion. Have converter for data output. It can also have digital input and output ports for digitally sensing input voltages and outputting digital switching signals. Also, by this controllable electronic switch, such as transistors, already be integrated in this, such as so-called open-collector outputs.
  • the microcontroller is designed for executing software programs which are stored non-volatilely in the microcontroller itself or which can be externally charged by it. The software programs describe the control and evaluation steps associated with the execution of the respective control and evaluation functions of the sensor device.
  • the big advantage of the invention lies in the particularly simple control of the two LEDs via the inverter. Separate switching elements for the two LEDs are not required.
  • the control is carried out in a very simple manner by energizing the respective light emitting diode in the positive and negative half wave of the provided at the output of the inverter AC voltage.
  • the inverter has an output side connected in series electrical energy storage, in particular a capacitor on.
  • a particularly high efficiency for the electrical supply of the two LEDs at the same time extremely small number of circuit components is possible.
  • Light-emitting diodes with a respectively definable minimum turn-on duration can be used twice as much as the current flowing through the light-emitting diodes, so that the efficiency of the circuit arrangement becomes particularly high.
  • the capacitor in the case of a positive supply voltage with respect to the ground potential in the first phase of operation, the capacitor is charged at the same time and in series and in the flow direction energized first LED so that it emits a light pulse.
  • the second phase of operation which may be separately adjustable by blocking phase of the first phase of operation by blocking control of the inverter, the capacitor is discharged, wherein the self-adjusting Entladeström is now passed over the second, now lying in the flow direction LED, so this also sends out a light pulse.
  • the two phases of operation take place briefly in time, followed by a relatively long pause, which can range from a few seconds to a minute.
  • the second light-emitting diode is preferably switched off. In a corresponding manner, the first light-emitting diode is switched off during the second operating phase.
  • the inverter has a half-bridge with two semiconductor switches, the first terminal of which lies on the common reference potential, such as ground, and whose second terminal is at a preferably positive reference potential.
  • the common reference potential is then connected to the negative pole of the battery or accumulator and / or to the ground line of the power supply line and the preferably positive reference potential to the positive pole of the battery / accumulator and / or connected to the positive line of the power supply line at least indirectly.
  • a capacitor connected as a capacity.
  • At the other terminal of the capacitor is then the output-side AC voltage.
  • a capacitor and a coil or a reactor inductance
  • a current limiting element in particular a resistor, connected in series and / or parallel to the respective light emitting diode.
  • the current-limiting element can also be connected in series with the circuit arrangement itself, in particular in the case of the use of two structurally identical light-emitting diodes.
  • the current limiting element may alternatively be a coil or a current source.
  • the two light emitting diodes are designed to emit light of substantially uniform wavelength.
  • the two light emitting diodes can e.g. Be IR or UV LEDs. On the other hand, they can also be red, green or blue LEDs.
  • the two light emitting diodes can emit electromagnetic radiation of arbitrary wavelengths. In addition to a comparatively narrow-band spectral range or even monochromatic radiation, the electromagnetic radiation may also have different wavelengths which represent a continuous spectrum or different separate narrowband and / or broadband spectral ranges.
  • the two light-emitting diodes are designed to emit light of essentially uniform wavelength, wherein the first light-emitting diode is designed to emit light of substantially a first wavelength and wherein the second light-emitting diode for emitting light is substantially of a second wavelength is trained.
  • the different scattering behavior such as smoke particles in the smoke
  • a determination of the type of smoke and thus the type of fire is possible.
  • a differentiation of black smoke in an open fire and white smoke in a smoldering fire is possible by evaluating the received signal by the evaluation at the respective operating phase.
  • the then first light-emitting diode is preferably an IR LED and the second light-emitting diode is a blue-light LED or a UV-LED. Due to the widely spaced wavelength range, a particularly good detection of the particle size is e.g. possible in the smoke to be detected. A particular advantage when using an IR and UV light-emitting diode is that the emitted light radiation is not visible to the human eye and thus in the case of use of the sensor device in an open fire detector or a proximity sensor is not bothersome.
  • the optical receiver is a photodiode or phototransistor sensitive to the light emitted by the two light emitting diodes.
  • the optical receiver is arranged as a first optical receiver for receiving scattered light substantially from the object to be detected, at which the light of the first light-emitting diode is scattered.
  • the sensor device has a second optical receiver, which is arranged to receive stray light substantially from the object to be detected, at which the light of the second light-emitting diode is scattered.
  • the evaluation unit is for evaluating a first and second received signal originating from the optical receivers set up .
  • a light-tight barrier may be present in each case between the first light-emitting diode and the first optical receiver and between the second light-emitting diode and the second optical receiver so that essentially only scattered light from the first light-emitting diode only to the first optical receiver and scattered light from the second light-emitting diode can only get to the second optical receiver. Due to the separate evaluation of the first and second received signal, a detection of smaller objects, such as insects in the field of light emitting diodes and optical receiver, possible. As a result, the presence of a small object can be detected by means of the evaluation unit on the basis of the detected, different in magnitude and time-varying receiving signals, and thus the output of a false alarm can be prevented. On the other hand, the presence of smoke with higher reliability can be determined by means of the evaluation unit due to the detected, different in magnitude and temporally slowly fluctuating receiving signals, and thus output of a fire alarm can be output more reliable.
  • the evaluation unit also has means for outputting drive signals for the clocked driving of the switching elements of the inverter.
  • the evaluation unit also has means for outputting drive signals for the clocked driving of the switching elements of the inverter.
  • the switching means are controllable with a predefinable pulse duration, with a predetermined duty cycle and / or with a predetermined waveform, so that by means of the evaluation unit the reflected in the received signal, backscattered by an object to be detected and modulated with the light of the two LEDs scattered light of is also distinguishable on the first optical receiver and optionally on the second optical receiver impinging extraneous light.
  • the particular advantage resides in the fact that signal components contained in the reception signals, both uniform and pulsed extraneous or ambient light, such as sunlight or flickering light from fluorescent tubes, can be computationally suppressed, ie eliminated, by means of the evaluation unit, eg by subtraction the external signal components that have been determined by the evaluation unit in the operating pauses in non-actuated LEDs.
  • the two optical receivers are photodiodes or phototransistors, which are sensitive to the light emitted by the associated light-emitting diode.
  • both photodiodes or phototransistors can simultaneously be exposed to the light emitted by both light emitting diodes, e.g. IR and UV light, be sensitive.
  • the evaluation unit has means for activating two deactivation switching elements, each of which deactivates one of the two
  • the evaluation unit is set up to determine a common measured value for light incident on both optical receivers together from the received signals. It is further configured to determine a first and second measured value if the common measured value exceeds a predetermined limit value. In this case, the evaluation unit is set up to sequentially determine the first measured value when the first deactivation switching element is activated and the second measured value when the second deactivating switching element is activated, and to determine an indicator for the presence of a fire on the basis of these three measured values.
  • the presence of smaller objects such as, for example, flies, insects or spiders in the region of the light-emitting diodes and optical receivers, can be detected particularly reliably by evaluating differences in the two reception signals detected by the evaluation unit over a period of time or abruptly.
  • the presence of stationary objects such as an open door as a stationary obstacle in the detection space, can be detected particularly reliably, with differences in the two received signals that do not change over time.
  • the smoke type when using differently colored light-emitting diodes, such as an IR light-emitting diode and a UV light emitting diode, the smoke type can be determined particularly reliably by means of the evaluation unit. In this case, fluctuations in the respective received signal can be determined particularly well by means of the evaluation unit.
  • differently colored light-emitting diodes such as an IR light-emitting diode and a UV light emitting diode
  • the deactivation switching elements are connected in parallel with the respective light-emitting diode. When activated, these can then be closed by the evaluation unit. As a result, the respective light-emitting diodes are more or less short-circuited, so that a light emission is omitted.
  • This embodiment of the deactivation is particularly advantageous when using an inverter with the capacitor connected to its output, so that the charging and discharging cycle of the capacitor can continue to be maintained.
  • the deactivation switching elements are connected in series with the respective light-emitting diode, so that they can be driven closed by the evaluation unit in normal operation and so that they can be controlled to selectively deactivate one of the light-emitting diodes.
  • the sensor device has a further circuit arrangement consisting of two branches connected in parallel, each having a first photodiode or a first phototransistor as the first optical system. and a respective second photodiode or a second phototransistor as a second optical receiver.
  • the two photodiodes are connected in antiparallel to one another, the voltage present across the two photodiodes being fed as a common received signal to a differential former, in particular a differential amplifier, and an output-side differential signal being fed to the evaluation unit for further evaluation.
  • the particular advantage here lies in the simple realization of a common-mode suppression for foreign or ambient light incident simultaneously on both photodiodes or phototransistors.
  • the photo voltages generated by both photodiodes cancel each other, while scattered light by possibly present objects, which falls due to the time-delayed control of the two LEDs in different operating phases on the respective spatially associated photodiode, in the respective operating phases leads to a unique difference signal, which is then applied to the second circuit arrangement for further processing.
  • the evaluation unit is set up to determine the common measured value from this difference signal. In the event that this common reading exceeds the preset limit, the evaluation unit is set up to determine the common measured value from this difference signal. In the event that this common reading exceeds the preset limit, the
  • Evaluation unit configured to first determine the first measured value when the first deactivation switching element is actuated and then the second measured value when the second deactivating switching element is actuated or in reverse order from the difference signal. On the basis of these three measured values, an indicator for the presence of a fire can then be determined again by means of the evaluation unit, as described above.
  • the object of the invention is also achieved by a hazard detector for detecting a dangerous situation, which is based on the scattered light principle and a erfindungsge- having sensor device.
  • the danger detector is in particular a smoke detector for detecting smoke in a detection space.
  • this smoke detector is an open smoke detector that has no optically closed measuring chamber.
  • the smoke detector can be a closed smoke detector. If appropriate, insects entering there, such as, for example, small flies, can likewise be detected by means of the sensor device according to the invention.
  • the object of the invention is achieved by a proximity sensor for optically detecting the presence of an object in a detection space, which has a sensor device according to the invention.
  • the first light-emitting diode and the first photodiode can be associated with a first reflection light barrier, which is directed against an object to be monitored.
  • the second light emitting diode and the second photodiode may be associated with a second reflected light barrier, which is likewise directed against the object to be monitored.
  • the light emitted by the LEDs is then reflected and impinges on the respective photodiode.
  • the received signal disappears and the presence detector triggers an alarm.
  • the proximity sensor may output a signal when reflected light on one of the two photodiodes exceeds a certain threshold.
  • 1 shows a basic circuit of a sensor device according to the invention
  • 2 shows an advantageous embodiment of the sensor device according to FIG. 1
  • FIG. 3 shows in a time diagram the mode of operation of the sensor device according to FIG. 2.
  • FIG. 4 shows a second embodiment of the inventive sensor device with two photodiodes as optical receiver in the presence of a large object
  • FIG. 5 shows a time diagram of the functioning of the sensor device according to FIG. 4,
  • FIG. 6 shows the second embodiment according to FIG. 4 in the presence of a small object
  • FIG. 7 shows a time diagram of the functioning of the sensor device according to FIG. 6,
  • FIG. 8 shows a third embodiment of the inventive sensor device with electrically bridgeable photodiodes in the presence of a small object
  • FIG. 9 shows a fourth embodiment of the sensor device according to the invention with a further circuit arrangement with two photodiodes connected in antiparallel as optical receiver in the presence of a small object.
  • FIG 1 shows a basic circuit of a sensor device 100 according to the invention.
  • an inverter 6 can be seen, which converts an input side applied DC voltage UDC in an AC voltage UAC.
  • the reference numeral 7 denotes the associated electrical connection. This can be connected to a battery, an accumulator and / or an external electrical power supply - symbolized by the symbol of a DC voltage source 8.
  • a circuit arrangement 1 of two parallel-connected branches 2, 3, each with a first light-emitting diode 4 and a second light-emitting diode 5 can be seen. Both light-emitting diodes 4, 5 are connected in antiparallel to one another and are set up to illuminate an object 10 to be detected in a detection space DR.
  • the object 10 itself is a cloud in the present example, which is intended to symbolize the penetration of smoke into the detection space DR in case of fire.
  • an optical receiver 14 in the form of a photodiode is shown, which is set up to receive scattered light from the object 10 to be detected. At this object 10, the light of the two LEDs 4, 5 is scattered and detected by the optical receiver 14. The scattered light is symbolized by a dashed arrow pointing away from the object 10.
  • an evaluation unit 16 for evaluating a received signal originating from the optical receiver 14 is shown. This evaluation unit 16, preferably a microcontroller, evaluates the measurement signal in a known manner and generates an alarm or message signal A when a predetermined limit value is exceeded.
  • Reference number 13 indicates a barrier which prevents light from the two light-emitting diodes 4, 5 can go directly to the optical receiver 14.
  • the activation of the two light-emitting diodes 4, 5 takes place in such a way that during the positive half-wave Ie - here in relation to the common ground potential and symbolized by the ground symbol - now the left LED 4 is energized, ie is energized, and that during the negative half-wave, the right LED 5 is energized.
  • FIG. 2 shows an advantageous embodiment of the sensor device 100 according to FIG. 1.
  • the inverter 6 has an electrical energy store 9 connected in series on the output side in the form of a capacitor.
  • the inverter 6 comprises a half-bridge of two series-connected, electronically controllable switching elements 61, 62, wherein in the present example the center tap of the half-bridge is connected directly to this capacitor 9.
  • these switching elements 61, 62 switching transistors, which are preferably also controlled by the evaluation unit 16.
  • Tl, T2 the associated drive signals for driving the switching elements 61, 62 are designated.
  • the second exemplary waveform is a pause between the two half-waves, which can be achieved by blocking control of the two switching elements 61, 62 adjustable.
  • an alarm contact 17 can still be seen, which in the event of an alarm is triggered by the control unit 16.
  • FIG. 3 shows in a time diagram the mode of operation of the sensor device 100 according to FIG. 2.
  • a curve 31 of an exemplary output change voltage UAC is to be seen, which has inter alia pause phases and which is represented simplified by a profile with rectangular phase components.
  • the curve 31 corresponds to the time course of the electric current, which flows on the one hand through the first light-emitting diode 4. This current, which is substantially directly proportional to the light emitted by the first light-emitting diode 4, reaches its maximum intensity in each case in the first operating phase in the first and fifth time sections 30 having a positive amplitude.
  • the curve 31 also shows the time profile of the electric current flowing through the second light-emitting diode 5 in the third and in the seventh time segment 30 with a negative amplitude. In the remaining pause sections this current is negligibly small.
  • a curve 32 corresponds to the time profile of the electric current, which flows only through the first light-emitting diode 4, while the curve 33 shows the course of the current flowing only through the second light-emitting diode 5.
  • a curve 34 shows the associated luminous flux of the optical receiver 14, which is caused by approximately the same size of scattered light from the object 10 by means of the two light-emitting diodes 4, 5.
  • FIG 4 shows a second embodiment of the sensor device 100 according to the invention with two photodiodes 14, 15 as optical receiver in the presence of a large object 10.
  • the sensor device 100 now has another one next to the first optical receiver 14, which is set up to receive scattered light essentially from the object 10 to be detected, on which the light from the first light-emitting diode 4 is scattered second optical receiver 15, which is arranged to receive stray light substantially from the object 10 to be detected, at which the light of the second light-emitting diode 5 is scattered.
  • the evaluation unit 16 is set up to evaluate a first and second received signal originating from the two optical receivers 14, 15.
  • the large object 10 shown may be a smoke front or a fixed object, which is scattered light from both
  • LEDs 4, 5 to the respective optical receiver 14, 15 backscattered in approximately the same order of magnitude.
  • FIG. 5 shows, in a time diagram, the mode of operation of the sensor device 100 according to FIG. 4.
  • the waveform of the curve 51 of the output change voltage UAC shown is simplified by a rectangular profile with a duty factor of 50:50.
  • the curve 52 shows the time profile of the current only through the first light-emitting diode 4, while the curve 53 shows the course of the current only through the second light-emitting diode 5.
  • the curves 54 and 55 show the respectively associated light flux of the optical receivers 14 and 15, which is caused in each case by approximately the same size of scattered light from the object 10 via the two light-emitting diodes 4, 5.
  • FIG. 6 shows the second embodiment according to FIG. 4 in the presence of a small object 10.
  • the small object 10 is e.g. a fly, which stays in the area of the sensor device 100. It can be seen that only the light emitted by the first light-emitting diode 4 is scattered at the object 10. On the other hand, because of the spatial arrangement of the second light-emitting diode 5, light from the second light-emitting diode 5 does not reach the object 10 at all. Consequently, no detection of stray light occurs at the associated second optical receiver 15.
  • FIG. 7 shows, in a time diagram, the mode of operation of the sensor device 100 according to FIG. 6.
  • a comparison with FIG. 5 shows that the amplitude of the curve 74, which corresponds to the curve 54 in FIG. 5, is now significantly lower because of the smaller cross-sectional area ,
  • the amplitude of the curve 75, which corresponds to the curve 55 in FIG. 5, is vanishingly small, since virtually no stray light is detected in the associated optical receiver 15.
  • FIG. 8 shows a third embodiment of the inventive sensor device 100 with electrically bridgeable photodiodes 4, 5 in the presence of a small object 10th
  • two deactivation switching elements 18, 19 are connected in parallel to the respective light-emitting diode 4, 5.
  • These switching elements 18, 19 are preferably switching transistors which can be closed when actuated by the evaluation unit 16.
  • Sl and S2 the associated deactivation signals are designated, which are output by the evaluation unit 16 to selectively turn off only one of the two LEDs 4, 5.
  • a flow diode 24, 25 is connected, which upon actuation of the deactivation switching element 18, 19 takes over the current flow through the respective branch 2, 3 as smoothly as possible. Thereby, the charging and discharging cycle of the capacitor 9 is further maintained by the inverter 6.
  • FIG. 9 shows a fourth embodiment of the inventive sensor device 100 with a further circuit arrangement 20 with two photodiodes 14, 15 connected in antiparallel as optical receiver in the presence of a small object 10.
  • the two branches of the further circuit arrangement 20 are designated.
  • the voltage applied across both photodiodes 14, 15 is fed to a differential imager 21 as a common received signal.
  • subtractor 21 is at the same time a differential amplifier (symbolized by the switching symbol of an operational amplifier), which amplifies the difference signal formed by a predetermined gain for improved further processing.
  • the output-side difference signal D is already supplied internally to the evaluation unit 16 for further evaluation in the example of FIG.
  • the evaluation unit 16 already has integrated, not further designated switching elements which are provided as deactivation switching elements for deactivating the two light-emitting diodes 4, 5.

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Abstract

L'invention concerne un dispositif détecteur (100) pour la détection optique d'un objet (10). Il présente une configuration de circuit (1) composée de deux branches (2, 3) montées en parallèle ayant chacune une première et une seconde diode électroluminescente (4, 5), les diodes électroluminescentes étant montées antiparallèles entre elles, et étant agencées pour l'éclairement d'un objet à détecter dans un espace de détection (DR). En outre, le dispositif présente une connexion électrique (7) qui est prévue pour l'alimentation en tension continue (UDC), au moins pour l'alimentation électrique de ladite configuration de circuit. Le dispositif détecteur comprend en outre un onduleur (6) qui est raccordé, côté entrée, à la tension continue et, côté sortie, à la configuration de circuit, et qui fournit une tension alternative convertie à partir de la tension continue, pour l'alimentation en alternatif des diodes électroluminescentes. Le dispositif comprend en outre un récepteur optique, installé pour la réception de lumière diffuse provenant de l'objet à détecter, récepteur sur lequel la lumière des deux diodes électroluminescentes est dispersée, et une unité d'évaluation, pour l'évaluation d'un signal reçu, émanant du récepteur optique. Le dispositif détecteur est, de préférence, un avertisseur de danger, d'après le principe de lumière diffuse, en particulier un détecteur d'incendie.
PCT/EP2010/052929 2009-03-06 2010-03-08 Dispositif détecteur pour la détection optique d'un objet, en particulier détecteur de fumées WO2010100288A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112010000985T DE112010000985A5 (de) 2009-03-06 2010-03-08 Sensorvorrichtung zum optischen Erfassen eines Objektes, insbesondere Rauchmelder

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP09154576.4 2009-03-06
EP09154576A EP2227068A1 (fr) 2009-03-06 2009-03-06 Emission variable de rayonnements électromagnétiques à l'aide de sources de rayonnement doubles

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WO2010100288A1 true WO2010100288A1 (fr) 2010-09-10

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PCT/EP2010/052929 WO2010100288A1 (fr) 2009-03-06 2010-03-08 Dispositif détecteur pour la détection optique d'un objet, en particulier détecteur de fumées

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WO2017194367A1 (fr) * 2016-05-13 2017-11-16 Siemens Schweiz Ag Détecteur d'incendie doté d'une photodiode pour détecter la lumière ambiante, de sorte à accélérer le déclenchement d'une éventuelle alarme incendie en fonction du résultat
WO2018228756A1 (fr) * 2017-06-13 2018-12-20 Siemens Schweiz Ag Boîtier pour un accumulateur d'énergie échangeable, comportant une possibilité de connexion à l'alimentation électrique d'un appareil électronique pouvant y être relié, ainsi qu'avertisseur de danger fonctionnant par radio
CN110431674A (zh) * 2017-01-25 2019-11-08 西门子瑞士有限公司 借助于具有用于发光的led芯片并且具有用于将所发射的光的部分转换成长波光的光转换器的发光二极管根据双色原理的光学烟雾探测

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EP0877345A2 (fr) * 1997-05-08 1998-11-11 Nittan Company, Limited Détecteur de fumée et système de commande de moniteur
WO2000007161A1 (fr) * 1998-07-31 2000-02-10 Gsbs Development Corporation Detecteur de fumee
DE10013207A1 (de) * 2000-03-17 2001-09-20 Tridonic Bauelemente Ansteuerung von Leuchtdioden (LED`s)
WO2003056878A1 (fr) * 2001-12-28 2003-07-10 Koninklijke Philips Electronics N.V. Commande de diode electroluminescente
EP1887536A1 (fr) * 2006-08-09 2008-02-13 Siemens Schweiz AG Détecteur de fumée à lumière diffusée

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017194367A1 (fr) * 2016-05-13 2017-11-16 Siemens Schweiz Ag Détecteur d'incendie doté d'une photodiode pour détecter la lumière ambiante, de sorte à accélérer le déclenchement d'une éventuelle alarme incendie en fonction du résultat
CN109155097A (zh) * 2016-05-13 2019-01-04 西门子瑞士有限公司 具有用于感测环境光的光电二极管以基于其来加速发出潜在火警报的火检测器
US10467874B2 (en) 2016-05-13 2019-11-05 Siemens Schweiz Ag Fire detector having a photodiode for sensing ambient light
CN110431674A (zh) * 2017-01-25 2019-11-08 西门子瑞士有限公司 借助于具有用于发光的led芯片并且具有用于将所发射的光的部分转换成长波光的光转换器的发光二极管根据双色原理的光学烟雾探测
CN110431674B (zh) * 2017-01-25 2023-01-13 西门子瑞士有限公司 借助于发光二极管根据双色原理进行光学烟雾探测的装置及其应用
WO2018228756A1 (fr) * 2017-06-13 2018-12-20 Siemens Schweiz Ag Boîtier pour un accumulateur d'énergie échangeable, comportant une possibilité de connexion à l'alimentation électrique d'un appareil électronique pouvant y être relié, ainsi qu'avertisseur de danger fonctionnant par radio

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EP2227068A1 (fr) 2010-09-08
DE202010018240U1 (de) 2014-12-01

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