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WO2009150562A1 - Dispositif de capteur sans fil et système d’éclairage comprenant un tel dispositif - Google Patents

Dispositif de capteur sans fil et système d’éclairage comprenant un tel dispositif Download PDF

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Publication number
WO2009150562A1
WO2009150562A1 PCT/IB2009/052268 IB2009052268W WO2009150562A1 WO 2009150562 A1 WO2009150562 A1 WO 2009150562A1 IB 2009052268 W IB2009052268 W IB 2009052268W WO 2009150562 A1 WO2009150562 A1 WO 2009150562A1
Authority
WO
WIPO (PCT)
Prior art keywords
wireless sensor
sensor device
energy
substrate
signal
Prior art date
Application number
PCT/IB2009/052268
Other languages
English (en)
Inventor
Willem F. P. Pasveer
Roger P. A. Delnoij
Theodorus J. P. Van Den Biggelaar
Adrianus Sempel
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2009150562A1 publication Critical patent/WO2009150562A1/fr

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/36—Electric signal transmission systems using optical means to covert the input signal
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/175—Controlling the light source by remote control
    • H05B47/19—Controlling the light source by remote control via wireless transmission
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/175—Controlling the light source by remote control
    • H05B47/198—Grouping of control procedures or address assignation to light sources
    • H05B47/1985—Creation of lighting zones or scenes

Definitions

  • Wireless sensor device and illumination system comprising such a device
  • the invention relates to the field of wireless sensor devices for lighting control. More specifically, the invention relates to a wireless sensor device and an illumination system comprising such a wireless sensor device, wherein the wireless sensor device comprises at least a light level sensor.
  • control systems have been developed that activate light sources only when the presence of human beings is detected, using occupancy sensors (e.g. pyroelectric infrared sensors), and to adapt the level of artificial light from the light sources depending on the level of daylight in the area, using light level sensors.
  • occupancy sensors e.g. pyroelectric infrared sensors
  • Occupancy sensors and light sensors may advantageously be used in combination.
  • the sensor devices typically need to be installed at particular locations in the area in order to fulfill the sensing function. Installation of such sensor devices is greatly facilitated by providing wireless sensor devices. Such sensor devices are capable of wireless transmission of the sensing data, or derivatives thereof, to the light sources (or a central controller thereof).
  • sensing data should be transmitted wirelessly, but also energizing the sensor devices should not require wire connections.
  • a battery or other energy storage means may be used to accomplish such a wireless sensor device.
  • WO2006/057322 discloses a wireless sensor device comprising a sensor defined by a photovoltaic cell.
  • the photovoltaic cell senses an illumination level on the one hand and converts light into electrical energy for accumulating electric power in a power supply of the wireless sensor device.
  • a wireless sensor device comprising a light level sensor.
  • the wireless sensor device also comprises an energy accumulator for powering the wireless sensor device.
  • the light level sensor comprises a substrate and at least one photo electric detector provided on the substrate and arranged for detecting light.
  • a switched capacitor (voltage) converter is provided on the same substrate. The converter is arranged to convert a first signal (voltage) from the photo electric detector to a second signal (voltage) for accumulating energy in the energy accumulator.
  • an illumination system comprising a plurality of light sources and at least one such a wireless sensor device.
  • the illumination system is configured for controlling one or more of the light sources in dependence on sensing data of said wireless sensor device.
  • a method for operating a wireless sensor device comprising a light level sensor with a substrate carrying at least one photo electric detector and a switched capacitor (voltage) converter is proposed.
  • Light is detected at the photo electric detector to provide a first signal (voltage).
  • the first signal is converted to a second signal (voltage) using the switched capacitor converter in order to accumulate energy in an energy accumulator. The energy is then available for powering the wireless sensor device.
  • the photo electric detector may comprise one or more photo diodes.
  • the energy stored in the energy accumulator can be used for providing power for one or more components of the wireless sensor device, such as the light level sensor, a further sensor (e.g. an occupancy sensor) and/or a transmitter.
  • the switched capacitor device is used to convert (raise) a voltage signal from the at least one photo electric detector to a voltage signal sufficient for the energy accumulator.
  • the integration of the at least one photo electric sensor and the switched capacitor converter on a single substrate provides a wireless sensor device of reduced complexity that is capable of accumulating itself at least some of the energy required for its operation, i.e. the light level sensor may be used for sensing purposes as well as for energy accumulation.
  • On chip integration of the at least one photo electric detector and the converter provides ease of manufacturing and enables reduced dimensions of the wireless sensor device.
  • the embodiment of claim 2 enables integrating a single photo diode in a bulk CMOS process.
  • the on-chip switched capacitor voltage convertor is used to boost the voltage from the photo diode to a level sufficient for the energy accumulator.
  • the embodiment of claim 3 enables quick charging of the energy accumulator under high light level conditions.
  • the embodiment of claim 4 allows the ratio between the sensing mode the energy accumulation mode to be chosen such that sufficient time is available for energy accumulation while sensing operation is not noticeably influenced.
  • the controller is configured such that the sensing mode time is shorter than the energy accumulation mode time.
  • the ratio of the sensing mode time to the energy accumulation mode time is less than 1%.
  • a sensing time of 1 minute may require an energy accumulation time of 5 hours.
  • the embodiment of claim 5 enables the operation of the wireless sensor device to be controlled by the first signal, i.e. by the detected light level.
  • enhanced sensing operation by the wireless sensor device may be promoted under high light level conditions and a lower level of activity during lower light level conditions.
  • the embodiment allows enhanced charging operation (and thus lowered sensing operation) by the wireless sensor device if a low energy status for the energy accumulator is detected under high light level conditions.
  • the embodiment of claim 6 provides for a sensor device comprising an array of photo diodes, wherein each diode is tuned to be responsive to a specific wavelength range of the light to be detected. As a consequence, the amount of light for each wave length range can be determined. Such tuning may e.g. be obtained by using wavelength filters or by selecting materials with specific wavelength sensitivity characteristics. Although the wavelength selective properties of the array result in a considerable loss of energy that could potentially have been harvested, sufficient energy may still be available since the period of energy accumulation (the energizing mode) is long in relation to the period of light sensing (the sensing mode).
  • the switched capacitor converter raises the signal from each photo diode of the array to a level sufficient for storing energy in the energy accumulator.
  • the embodiment of claim 7 provides the advantage of powering further sensors using energy stored in the energy accumulator.
  • a further sensor may e.g. be an occupation sensor configured for detecting motion in an area of an objection (e.g. a human being) as defined in claim 8.
  • the embodiment of claim 9 is advantageous in that the transmitter for transmitting the sensing data is also powered from the energy accumulator.
  • the transmitter for transmitting the sensing data is also powered from the energy accumulator.
  • Fig. 1 is a diagrammatic view of a room comprising a wireless sensor device and an illumination system according to an embodiment of the invention
  • Figs. 2A and 2B show schematic illustrations of a wireless sensor device and an electrical circuit diagram according to a first embodiment of the invention.
  • Figs. 3 A and 3B show schematic illustrations of a wireless sensor device and an electrical circuit diagram according to a second embodiment of the invention.
  • FIG. 1 shows an illumination system 1 provided in an area (such as a room) occupied by a person P.
  • the illumination system 1 comprises a wireless sensor device 2 and at least one armature 3 having one or more light sources (not shown).
  • the area may e.g. be an office environment or a domestic environment.
  • a central controller 4 may be present in the room to receive the signals from the wireless sensor device 2 and to provide operation commands for the armature or armatures 3 in the room.
  • the wireless sensor device 2 may be used in other applications.
  • An example includes monitoring the operation of a light source in an installation, such as a UV light source in a purification device.
  • a light source may be monitored in view of the life time of the light source (e.g. defect light source, light output below a particular threshold etc.).
  • the wireless sensor device 2 controls the operation of the armature 3 in response to triggers sensed by the sensing device.
  • triggers may include the entrance of the person P into a room or a change of the ambient light level in the room.
  • the type of triggers that may be detected depend on the sensors comprised in the wireless sensor device 2.
  • Examples of control of the operation of the armature 3 include switching on/off one or more light sources of the armature, adapting the color and/or brightness of the light emitted by the light sources, redirecting the light of the light sources etc.
  • FIGS. 2A-2B and FIGS 3A-3B provide schematic illustrations and circuit diagrams of wireless sensor devices 2 according to embodiments of the invention.
  • the wireless sensor device 2 of these embodiments comprises a light level sensor 10, 20, respectively.
  • Both wireless sensor devices 10, 20 comprise a substrate 11, 21 for the light level sensor 10, 20, an energy accumulator 12, 22, an occupancy sensor 13, 23 and a controller 14, 24.
  • the controller 14, 24 is configured for switching the operation of the light level sensor 10, 20 between a sensing mode (in which the light level in the room is registered) and an energy accumulation mode (in which energy is collected from light incident on the photo electric detector for energizing the energy accumulator 12, 22). Controller 14, 24 may be configured to obtain and process information on the energy status of the energy accumulator 12, 22 and control the switching between the sensing mode and the energy accumulation mode in dependence on the energy status. The controller 14, 24 may be integrated on the substrate 11, 21.
  • the energy accumulator 12, 22 comprises e.g. a rechargeable battery or a super capacitor.
  • the sensors of the wireless sensor device 2 are typically active only during a limited period of time as compared to the inactive periods. Therefore, sufficient time is available for energy accumulation in the inactive period.
  • the light level sensor 10 has a single photo diode 15 provided on a CMOS substrate 11.
  • the photo diode has a surface area in a range between 1-10 mm 2 .
  • a switched capacitor voltage converter 16 and a transmitter 17 are also provided on the CMOS substrate 11.
  • the light level sensor 20 comprises an array of photo diodes 25 on the substrate 21 wherein each diode 25 is tuned to be responsive to a specific wavelength range of the light to be detected. Such tuning may e.g. be obtained by using wavelength filters or by selecting materials with specific wavelength sensitivity characteristics.
  • Substrate 21 further carries a switched capacitor voltage converter 26 and a transmitter 27. Each of the diodes 25 is connected separately to the switched capacitor voltage converter 26.
  • Switched capacitor voltage converters 16, 26 are arranged such that, in the energy accumulation mode of the wireless sensor device 2, a voltage generated by detecting light by the photo diode(s) 15, 25 is converted to a voltage for accumulating energy in the respective energy accumulators 12, 22.
  • the voltage converters comprise one or more capacitors C and one or more switches (schematically illustrated by a switch S) for transferring charge from the capacitor C to the energy accumulator 12, 22 in a manner known as such.
  • switches S and capacitors C is determined by the desired voltage conversion.
  • the switched capacitor voltage converters 16, 26 are configured to convert a voltage of -0.5V over the photo diode 15, 25 to 1.8V or higher for charging the energy accumulator 12, 22.
  • Switched capacitor voltage converters are especially suitable since the components (switches, capacitors) of the converters can be readily integrated on-chip with the photo diodes 15, 25.
  • the switches of the switched capacitor voltage converters 16, 26 are switched back and forth at a particular switching frequency controlled by oscillators 18, 28 integrated in the converters 16, 26.
  • the switching frequency can be controlled in dependence on the light level sensed by the photo diodes 15, 25, indicated by arrow CTRL.
  • Controller 24 controls switches Sl -S3 to switch the operation of the light level sensor 20 between a sensing mode (switches Sl -S3 in position A such that current Il runs) and an energy accumulation mode (switches Sl -S3 in position B such that current 12 runs).
  • a sensing mode switches Sl -S3 in position A such that current Il runs
  • an energy accumulation mode switches Sl -S3 in position B such that current 12 runs.
  • amplifier Al is powered to amplify the sensing signal of photo diode 25 in the sensing mode.
  • Controller 24 is configured such that the time wherein switches Sl -S3 are in position A is longer than the time wherein switches Sl -S3 are in position B in order to have sufficient time for energizing the energy accumulator 22.
  • the ratio of the time wherein switches Sl -S3 are in position A to the time wherein switches Sl -S3 are in position B is less than 1% in a particular time interval.
  • Switching between the two modes of operation may be dependent on the energy status of the energy accumulator 22. If photo detector 25 measures a high light level in the room, while the energy in the energy accumulator 22 is low, controller 24 may instruct switches Sl -S3 to remain in position B for a longer time period to boost the energy level in the energy accumulator 22. In this situation, also occupancy sensor 23 may be kept inactive for a longer time period.
  • switching between the two modes of operation may also be dependent only on the light level in the room as sensed by photo diode 25. If a high light level is detected, switches Sl -S3 may be kept in position A for a longer timer period for improved light sensing. Also, occupancy sensor 23 may be active for a longer period under such conditions.
  • operation of the switched capacitor voltage convertor 26 may also be dependent on the sensed light level by photo diode(s) 25.
  • the frequency of transferring charge from capacitor C to energy accumulator 22, using the oscillator 28 to control switch(es) S may be higher under high light level conditions in the room to obtain accelerated energy accumulation in the energy accumulator 22.
  • a lower frequency for switching the switch(es) S may apply under low light level conditions in the room. It is noted that in FIG. 3B, capacitor(s) C for the voltage conversion are not shown.
  • light level sensor 20 senses the light level in the room.
  • the obtained information may be processed and the resulting sensing data are transmitted to armature 3 to control e.g. the brightness of the light sources.
  • the operation of the occupancy sensor 23 may or may not be synchronized with the operation of the light level sensor 20.
  • Occupancy sensor 23 is arranged for detecting motion in the room and may e.g. comprise a pyroelectric infrared sensor. If person P enters the room or moves, transmitter 27 (or another transmitter) informs armature 3 to switch on the light sources. The armature 3 is informed either directly or via the central controller 4 of the illumination system.
  • Processing of the information obtained from the occupancy and/or light level sensors may be done in controller 14, 24.
  • the illumination system 1 may comprise a plurality of wireless sensor devices 2. In order to allow each wireless sensor device 2 to accumulate sufficient energy, the wireless sensor devices 2 may transmit sensing data at different times.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

L’invention concerne un système d’éclairage et un dispositif de capteur sans fil pour un tel système d’éclairage. Le dispositif de capteur sans fil comprend un capteur de niveau de lumière et un accumulateur d’énergie pour alimenter le dispositif de capteur sans fil. Le capteur de niveau de lumière comprend un substrat et au moins un détecteur photoélectrique disposé sur le substrat et conçu pour détecter la lumière. L’invention concerne également un convertisseur de condensateur commuté (tension) sur le même substrat. Le convertisseur est conçu pour convertir un premier signal (tension) du détecteur photoélectrique en un second signal (tension) pour accumuler l’énergie dans l’accumulateur d’énergie.
PCT/IB2009/052268 2008-06-11 2009-05-29 Dispositif de capteur sans fil et système d’éclairage comprenant un tel dispositif WO2009150562A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP08158013.6 2008-06-11
EP08158013 2008-06-11

Publications (1)

Publication Number Publication Date
WO2009150562A1 true WO2009150562A1 (fr) 2009-12-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2009/052268 WO2009150562A1 (fr) 2008-06-11 2009-05-29 Dispositif de capteur sans fil et système d’éclairage comprenant un tel dispositif

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Country Link
WO (1) WO2009150562A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011156620A1 (fr) * 2010-06-09 2011-12-15 Energy Focus, Inc. Ensemble émetteur alimenté par la lumière
US8357550B2 (en) 2009-05-27 2013-01-22 Koninklijke Philips Electronics N.V. Occupancy sensor
FR2979776A1 (fr) * 2011-09-07 2013-03-08 Air Liquide Services Dispositif de transmission d'un signal a distance, notamment de transmission d'un signal par radiofrequence
WO2013116101A1 (fr) * 2012-02-03 2013-08-08 Cree, Inc. Point de couleur et/ou dispositif de correction de sortie de lumen, système d'éclairage avec point de couleur et/ou correction de sortie de lumen, dispositif d'éclairage et procédés d'éclairage
CN109961626A (zh) * 2019-03-12 2019-07-02 西安联飞智能装备研究院有限责任公司 一种具有隔离及滤波功能的28vgnd/开路信号采集器

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001011926A1 (fr) * 1999-08-10 2001-02-15 Koninklijke Philips Electronics N.V. Systeme de regulation de l'eclairage avec detecteur sans fil a distance
WO2004021301A2 (fr) * 2002-08-28 2004-03-11 Lockheed Martin Corporation Systeme et procede de detection a distance multi-operant
US20050030177A1 (en) * 2001-10-11 2005-02-10 Andre Albsmeier Wireless sensor system
US20070012349A1 (en) * 2000-04-27 2007-01-18 Konarka Technolgies, Inc. Photovoltaic sensor facilities in a home environment
WO2007063480A2 (fr) * 2005-11-30 2007-06-07 Koninklijke Philips Electronics N.V. Systeme et procede de charge de dispositif de commande de systeme d'eclairage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001011926A1 (fr) * 1999-08-10 2001-02-15 Koninklijke Philips Electronics N.V. Systeme de regulation de l'eclairage avec detecteur sans fil a distance
US20070012349A1 (en) * 2000-04-27 2007-01-18 Konarka Technolgies, Inc. Photovoltaic sensor facilities in a home environment
US20050030177A1 (en) * 2001-10-11 2005-02-10 Andre Albsmeier Wireless sensor system
WO2004021301A2 (fr) * 2002-08-28 2004-03-11 Lockheed Martin Corporation Systeme et procede de detection a distance multi-operant
WO2007063480A2 (fr) * 2005-11-30 2007-06-07 Koninklijke Philips Electronics N.V. Systeme et procede de charge de dispositif de commande de systeme d'eclairage

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8357550B2 (en) 2009-05-27 2013-01-22 Koninklijke Philips Electronics N.V. Occupancy sensor
WO2011156620A1 (fr) * 2010-06-09 2011-12-15 Energy Focus, Inc. Ensemble émetteur alimenté par la lumière
FR2979776A1 (fr) * 2011-09-07 2013-03-08 Air Liquide Services Dispositif de transmission d'un signal a distance, notamment de transmission d'un signal par radiofrequence
EP2568458A1 (fr) * 2011-09-07 2013-03-13 Air Liquide Services Dispositif de transmission d'un signal à distance, notamment par radiofréquence
WO2013116101A1 (fr) * 2012-02-03 2013-08-08 Cree, Inc. Point de couleur et/ou dispositif de correction de sortie de lumen, système d'éclairage avec point de couleur et/ou correction de sortie de lumen, dispositif d'éclairage et procédés d'éclairage
US9554445B2 (en) 2012-02-03 2017-01-24 Cree, Inc. Color point and/or lumen output correction device, lighting system with color point and/or lumen output correction, lighting device, and methods of lighting
CN109961626A (zh) * 2019-03-12 2019-07-02 西安联飞智能装备研究院有限责任公司 一种具有隔离及滤波功能的28vgnd/开路信号采集器

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