WO2015177039A1 - Dispositif d'éclairage - Google Patents

Dispositif d'éclairage Download PDF

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Publication number
WO2015177039A1
WO2015177039A1 PCT/EP2015/060715 EP2015060715W WO2015177039A1 WO 2015177039 A1 WO2015177039 A1 WO 2015177039A1 EP 2015060715 W EP2015060715 W EP 2015060715W WO 2015177039 A1 WO2015177039 A1 WO 2015177039A1
Authority
WO
WIPO (PCT)
Prior art keywords
level
lighting device
light
measurements
light sensor
Prior art date
Application number
PCT/EP2015/060715
Other languages
English (en)
Inventor
Rene Van Honschooten
Roger Peter Anna Delnoij
Marco Haverlag
Haimin Tao
Johannes Jozef Wilhelmus Kalfs
Original Assignee
Koninklijke Philips 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 N.V. filed Critical Koninklijke Philips N.V.
Publication of WO2015177039A1 publication Critical patent/WO2015177039A1/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
    • H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/04—Controlling
    • H05B39/041—Controlling the light-intensity of the source
    • H05B39/042—Controlling the light-intensity of the source by measuring the incident light
    • 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
    • H05B47/105—Controlling the light source in response to determined parameters
    • H05B47/11—Controlling the light source in response to determined parameters by determining the brightness or colour temperature of ambient light
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Definitions

  • the present invention generally relates to the field of controlling illumination in a room, and more particularly to a lighting device arranged to perform an automatic calibration of its light sensor unit.
  • lighting devices can be dimmed or switched off when a large amount of daylight enters the room, or when no one is present in a working area, and lighting devices may be dimmed up or switched on when it gets darker and/or a person enters a working area.
  • a lighting control system using a light sensor unit for measuring the total light level of the sensed light, which typically includes artificial light from lighting devices as well as natural light, i.e. daylight, entering the room through windows and other light inlets.
  • the lighting control system can be applied for several lighting devices in common or for each individual lighting device.
  • Such a lighting control system is also known as a daylight harvesting system.
  • US 2010/0045191 discloses a sensor system capable of automatic calibration.
  • the system is arranged for recognizing when it is dark outside in order to define a measurement point for a minimum illumination level. This is done by monitoring the total light level and detecting when it reaches a minimum, which is assumed to occur when all lighting devices are switched off and it is dark outside at night. When the minimum total light level is sensed and all lighting devices are off a first measurement is performed, then all lighting devices are switched on at maximum output level, and a second measurement is performed.
  • This prior art sensor system has a drawback in that the calibration cannot take place at an arbitrary time of the day and night.
  • a lighting device comprising a dimmable light source, a driver unit for the light source, a light sensor unit, and a controller.
  • the lighting device is arranged to perform an automatic calibration sequence, wherein the controller is arranged to control the automatic calibration sequence.
  • the controller is arranged to gradually increase a control signal to the driver unit from a minimum level; to control the light sensor unit to perform a plurality of measurements of total light level, comprising at least a first measurement of the total light level taken when the control signal to the driver unit is at the minimum level, and a second measurement of the total light level taken when the level of the total light has stopped to increase; and to use the plurality of measurements to calibrate the light sensor unit.
  • the controller is arranged to start the automatic calibration sequence when the lighting device is turned on.
  • an off-on trigger event no particular conditions have to apply to perform the calibration sequence, and no person has to be involved to start the calibration.
  • the maximum output level of the driver unit is individually adjustable by an external limiting signal, and the output level is adjustable by the controller between a minimum output level and the maximum output level. Since the calibration sequence involves a detection of when the measured total light level has stopped to increase, the upper limit of the control range is adapted to the actually obtainable light output level of the lighting device determined by the external limiting signal, and not to the maximum level of the control signal to the driver unit.
  • the light sensor unit is arranged to sense an increasing total light level during the gradual increase and to sense a stop of that total light level increase. Thereby, there is no need to communicate the external limiting signal as such to the controller, which simplifies the lighting device.
  • the light sensor unit comprises the controller and a light sensor circuit connected with the controller.
  • the driver unit can be made simple and inexpensive.
  • the lighting device comprises a mains input for receiving external mains power
  • the driver unit comprises a limiting input for receiving an external limiting signal adjusting the maximum output level of the driver unit, a dimming input, connected with the controller for receiving a dimming signal controlling the output level of the driver unit between a minimum output level and the maximum output level, and an output connected with the light source.
  • the driver unit comprises a logic circuit connected with the limiting input and with the dimming input, and a drive circuit connected with the logic circuit and with the output, wherein the logic circuit is arranged to provide a control signal to the drive circuit corresponding to the lowest signal level of the limiting signal received at the limiting input and the dimming signal received at the dimming input.
  • the controller is arranged to decide whether or not to use the measurements. Thereby, a too small range of the control signal, which can be the result if the maximum output level of the driver unit is too low, is avoided.
  • a method of performing an automatic calibration sequence at a lighting device comprising a dimmable light source, a driver unit for the light source, a light sensor unit, and a controller, the method comprising: - performing a plurality of measurements of a total light level, comprising at least setting a control signal to the driver unit to a minimum level and performing a first measurement of the total light level, increasing the level of the control signal while monitoring the total light level, detecting that the level of the total light stops to increase, and performing a second measurement of the total light level when this level has stopped to increase; and
  • said using the plurality of measurements to calibrate the light sensor unit comprises deciding whether or not to use the measurements at all.
  • a computer program product for a lighting device comprising executable program portions for performing an automatic calibration sequence, comprising the following operations:
  • Fig. 1 is a block diagram of an embodiment of a lighting device according to the present invention.
  • Fig. 2 is a flow chart of an embodiment of an automatic calibration sequence
  • Fig. 3 and 4 are timing diagrams for different operation examples of an embodiment of the automatic calibration sequence according to the invention.
  • Fig. 5 is a timing diagram for another embodiment of the automatic calibration sequence.
  • a first embodiment of the lighting device 1 comprises a dimmable light source 2, a driver unit 3 connected with the light source for powering it, and a light sensor unit 4 connected with the driver unit 3 for providing it with a control signal for controlling its power input to the light source 2.
  • the light sensor unit 4 controls the dimming level of the light source 2.
  • the light sensor unit 4 comprises a light sensor circuit 5 arranged to sense the total light level, which includes daylight and reflected artificial light from the lighting device 1 itself and possibly from other nearby lighting devices, which has been reflected by an object 17 in the vicinity of the lighting device 1 .
  • the light sensor unit 4 further comprises a controller 6, which is connected with the light sensor circuit 5 and with the driver unit 3.
  • the driver unit 3 comprises a drive circuit 7, which provides the very drive current to the light source 2, and a logic circuit 8, which is connected with the drive circuit, and which provides the drive circuit 7 with the drive current level signal. Furthermore, the driver unit 3 comprises a limiting input 9, which is also an input of the lighting device 1 , for receiving an external limiting signal adjusting the maximum output level of the driver unit 3, and a dimming input 10, which is connected with a corresponding dimming output 1 1 of the light sensor unit 4.
  • the driver unit 3 has a drive current output 12 connected with a corresponding drive current input 13 of the light source 2.
  • the lighting device 1 has a mains input 14 for powering the lighting device 1 .
  • the light sensor circuit 5 has an output 15 for providing the controller 5 with a sensed total light level signal at a corresponding input 16 thereof.
  • the lighting device 1 is arranged to output light at a dimming level which is dependent on the sensed level of total light level, including daylight. Within the present field of technology this is commonly referred to as a daylight harvesting system. Basically, the light output is dimmable within a range extending from light output to the maximum light output that the light source 2 is able to deliver. However, additionally, the range can be limited. In this embodiment the upper limit is adjustable by means of the external limiting signal received by the driver unit 3, and more particularly by the logic circuit 8. Thus, a user of the lighting device 1 , or a lighting system comprising several similar lighting devices, and having a central controller, is able to remotely set a maximum light output level, i.e. the upper limit of the range.
  • the instantaneous light output level is continuously controlled by the controller 6 in dependence on input from the light sensor circuit 5.
  • the logic circuit 8 thus receives a dimming signal from the controller 6, which adjusts the light output level within the range. If the maximum light output level has been decreased by means of the limiting signal, the controller 6 may still apply a dimming signal asking which would generate a higher level, but the logic circuit 8 will then provide the drive circuit 7 with a drive current level signal which corresponds with the limited maximum light output level. Thus, the logic circuit 8 outputs a drive current level signal corresponding with the lowest of the limiting signal and the dimming signal.
  • the minimum light output level is zero, i.e. no light output at all, while in other embodiments there may be a non-zero minimum light output in order to provide at least a minimum illumination of a room as long as the lighting device 1 is turned on.
  • the lighting device 1 is arranged to perform an automatic calibration sequence to calibrate the light sensor unit 4.
  • an automatic calibration sequence to calibrate the light sensor unit 4.
  • the controller 6 is controlled by the controller 6 as follows.
  • the controller 6 receives a trigger input, which in this embodiment is when the mains input transits from an off state to an on state, i.e. when the lighting device 1 is turned on, in box 20, the controller 6 is arranged to start the calibration sequence, in box 21 .
  • the calibration sequence begins with the controller 6 adjusting the dimming signal to the minimum level, typically zero, in box 22.
  • the controller 6 performs a first measurement M1 of the total light level, i.e.
  • the controller 6 it samples the sensed total light signal from the light sensor circuit 5 and stores the measurement as a first sensed value, and also stores the associated first dimming signal value, in box 23.
  • the controller 6 gradually increases the dimming signal while monitoring the sensed total light signal, in box 24. As long as the sensed total light signal increases the controller 6 keeps increasing the dimming signal, but when the sensed total light signal stops to increase, in box 25, the controller 6 performs a second measurement M2 and stores a second sensed value in conjunction with a second dimming signal value associated with the thus sensed maximum total light level, in box 26.
  • the controller 6 can be arranged to compute a slope of the total light signal, for instance based on two successive measurements, and to determine that the sensed total light signal stops to increase when the slope is null of below a given threshold value. This typically corresponds with that the light output reaches its maximum, as illustrated in Fig. 3.
  • the stored values are then used to adjust the light sensor unit 4 such that the interval between the first dimming signal value and the second dimming signal value is defined as the full control range for controlling the light output of the light source 2 in dependence of the sensed total light level during the subsequent operation of the lighting device 1 .
  • the outcome of the automatic calibration sequence is used in the daylight harvesting control loop.
  • the limiting signal has been set to reduce the maximum light output, this results in that the maximum sensed total light level is reached before the dimming signal has reached its maximum, since the light output does not increase beyond that level.
  • the thereby reduced maximum dimming signal level is redefined as the maximum level that the controller 6 is able, or allowed, to output during the following operation of the lighting device 1 .
  • Fig. 4 the maximum sensed total light level is reached when the dimming signal has been ramped-up to its absolute maximum.
  • the sensed total light level stops increasing when the dimming signal reaches half its absolute maximum, because the limiting signal is set to half of its
  • the driver unit 3 can be controlled with the limiting signal.
  • a phase-cut technique is used for the limiting signal. Consequently, for instance, the halved limiting signal is obtained by a 90 degree phase-cut.
  • the limiting signal is based on an analog voltage between between 1 -10V according to IEC-60929.
  • the measurements are only used for calibration if a sufficient accuracy can be ensured, in box 27. For instance the dimming signal range between the first and second dimming signal values has to be large enough.
  • the controller 6 is arranged in the light sensor unit 4. This is done in order to enable the use of a simple driver unit 3, which can be a standard type of driver unit, which reduces the cost of the lighting device.
  • a simple driver unit 3 which can be a standard type of driver unit, which reduces the cost of the lighting device.
  • the controller 6 is a separate element or is integrated in the driver unit 3, which however is less advantageous.
  • delays are introduced before and after each
  • the increase, such as the ramp-up, of the dimming signal is paused during a time period, and the values of the total light level and of the dimming signal level are measured and stored during that time period, such as approximately in the middle of the time period, as shown in Fig. 5.
  • the dimming signal is held at its minimum level during a pre-delay time before the very measurement, and during a post-delay time after the very measurement.
  • the dimming signal is ramped-up a predetermined fraction of the maximum dimming signal to a second level, where it is held again for the same pre-delay time before a second measurement is performed followed by the same post-delay time.
  • Fig. 5 an example with two lighting devices is shown, where their automatic calibration sequences L1 , L2 are begun at slightly different points of time, but at each measurement both lighting devices are at the same stage of holding the dimming signal. This is advantageous if the lighting devices are placed so close that the total light detected by the light sensor circuit of a lighting device contains light originating from another lighting device.
  • the method is performed by means of a computer program downloaded to the lighting device.
  • the computer program can be provided as a downloadable computer program product, comprising executable program portions for performing an automatic calibration sequence, comprising the following operations:
  • a computer program may be stored/distributed on a suitable medium, such as an optical storage medium or a solid-state medium supplied together with or as part of other hardware, but may also be distributed in other forms, such as via the Internet or other wired or wireless telecommunication systems. Any reference signs in the claims should not be construed as limiting the scope.

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  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

L'invention concerne un dispositif d'éclairage qui comprend une source de lumière (2) à intensité réglable, une unité d'attaque (3) pour la source de lumière, une unité (4) de capteur de lumière et un organe de commande (6), le dispositif d'éclairage étant agencé afin de réaliser une séquence d'étalonnage automatique. L'organe de commande est agencé pour commander la séquence d'étalonnage automatique, l'organe de commande étant agencé pour augmenter graduellement à partir d'un niveau minimum un signal de commande vers l'unité d'attaque ; commander l'unité de capteur de lumière afin de réaliser une pluralité de mesures du niveau de lumière totale, comprenant au moins une première mesure du niveau de lumière totale prise lorsque le signal de commande vers l'unité d'attaque est au niveau minimum et une seconde mesure du niveau de lumière totale prise lorsque le niveau de la lumière totale a arrêté d'augmenter ; et utiliser la pluralité de mesures pour étalonner l'unité de capteur de lumière.
PCT/EP2015/060715 2014-05-23 2015-05-14 Dispositif d'éclairage WO2015177039A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP14169691 2014-05-23
EP14169691.4 2014-05-23

Publications (1)

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WO2015177039A1 true WO2015177039A1 (fr) 2015-11-26

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110278574A (zh) * 2018-03-16 2019-09-24 维沃移动通信有限公司 测量方法、测量配置方法、终端及网络设备

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070185675A1 (en) * 2006-02-08 2007-08-09 Konstantinos Papamichael Method for calibrating a lighting control system that facilitates daylight harvesting
US20100045191A1 (en) 2006-12-22 2010-02-25 Koninklijke Philips Electronics N.V. Device for controlling light sources
US20130293113A1 (en) * 2012-05-07 2013-11-07 Starfield Controls Inc. Self Calibrating, Adaptive Setpoint Daylighting

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070185675A1 (en) * 2006-02-08 2007-08-09 Konstantinos Papamichael Method for calibrating a lighting control system that facilitates daylight harvesting
US20100045191A1 (en) 2006-12-22 2010-02-25 Koninklijke Philips Electronics N.V. Device for controlling light sources
US20130293113A1 (en) * 2012-05-07 2013-11-07 Starfield Controls Inc. Self Calibrating, Adaptive Setpoint Daylighting

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110278574A (zh) * 2018-03-16 2019-09-24 维沃移动通信有限公司 测量方法、测量配置方法、终端及网络设备
CN110278574B (zh) * 2018-03-16 2021-06-04 维沃移动通信有限公司 测量方法、测量配置方法、终端及网络设备

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