EP2911481A1 - Procédé et dispositif pour étalonner une commande de gradateur - Google Patents

Procédé et dispositif pour étalonner une commande de gradateur Download PDF

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Publication number
EP2911481A1
EP2911481A1 EP14155784.3A EP14155784A EP2911481A1 EP 2911481 A1 EP2911481 A1 EP 2911481A1 EP 14155784 A EP14155784 A EP 14155784A EP 2911481 A1 EP2911481 A1 EP 2911481A1
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EP
European Patent Office
Prior art keywords
level
dimmer
light output
output level
dim
Prior art date
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Granted
Application number
EP14155784.3A
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German (de)
English (en)
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EP2911481B1 (fr
Inventor
Bert Hendrik F. De Haes
David Thielman
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One Smart Control Nv
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Individual
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    • 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

Definitions

  • the invention relates to the calibration of a dimmer controller.
  • a dimmer controller receives dimming commands from an input device and will on its turn control a dimmer by supplying it a dim level according to the dimming command.
  • the relation between the dimming commands and the dim level is configured for operation after the calibration.
  • a dimmer allows adapting the light output level of a light.
  • the luminance and thus the luminance intensity will vary with a varying dim level.
  • the relationship between the supplied dim level and the light output level defines the dimming profile. This profile is determined by different factors, e.g. the type of dimming technology used, the type of light that is dimmed and the settings within the dimmer itself.
  • the dimming profile is preferably also not linear and compensates for this kind of effect.
  • dimmers may now be controlled be a dimmer controller.
  • a dimmer controller is typically located in a central location, for example in an electrical enclosure and is typically part of or embedded in a home automation system.
  • the dimmers may also be located in this enclosure or may be remotely connected to the controller.
  • the dimmer controller allows implementing more complex dimming schemes. With such a controller, a user may select from an input device from a range of dimming schemes such as for example "TV”, “party”, “dinner” or “meeting”. Depending on the dimming scheme, the controller will then adjust the dimmers appropriately to create the preprogramed lighting scheme.
  • a dimmer controller also allows using more input devices. Apart from traditional switches, the dimmer controller may also be controlled from a laptop, smartphone or tablet by a communication interface in the controller connecting it with a local or wide area network.
  • dimmers and dimmer controllers have also opened the way for energy saving solutions as a dimmed light will consume considerably less power when not operating at its highest dim level, i.e. when not operating at its highest luminance.
  • One such solution uses photo sensors that measure the total light level in a room, i.e., the light level obtained by both daylight and artificial light. The lights are then dimmed by the controller in such a way that the total light output level corresponds to a preset level. This way, the lights do not continuously operate at their highest output level and, thus, energy is saved. Although very effective, this solution is complex to implement as sensors need to be installed permanently and their position is crucial in order to obtain the desired effect.
  • This object is achieved, in a first aspect, by a method for calibrating a dimmer controller by a portable device performing the following steps:
  • the dimmer is thus dimmable between a highest dim level and a lowest dim level.
  • the light receives its highest power resulting in a highest light output level.
  • the highest power may for example be the same power as there would be no dimmer and the light would be switched on by a light switch.
  • the light receives its lowest power from the dimmer resulting in a lowest light output level. In a typical dimmer, at the lowest light output level the light might not be observable any longer by a human eye.
  • the light output level of the light is measured by the portable device while the dim level is varied. These measurements may for example be performed by a photo sensor or camera comprised in the portable device. In order to do so, the portable device is positioned near the light such that the light output power can be measured. The portable device may for example be held under the light that is measured.
  • the light's output level will not exceed the first threshold light output level any longer after the calibration and thus during normal operation by a user.
  • the light output level of a light refers to a measurable amount of light power that a light emits, i.e. the light power perceivable by a human eye. This may for example be expressed by the luminance intensity which is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human eye.
  • a photo-sensor or camera may provide a good measure of the luminous intensity or light output power in general.
  • the difference between the first threshold light output level and the highest light output level is not observable by an average human eye.
  • the calibration of the dimmer by the maximum dim level thus has no noticeable effect on the perceived light by a person.
  • This may be accomplished by choosing the first threshold light output level within 90% of the highest light output level, i.e., the measured highest light output level. More preferably, the first threshold light output level is within 95% of the highest light output level. An average human eye will not observe such a reduction within 10% to 5% of the light output level.
  • the, first threshold light output level is calculated as a factor of the highest light output level where this factor is between 0.9 and 1, preferable between 0.95 and 1.
  • the first threshold light output level may also be determined as the measured highest light output level. The first threshold light output level then equals the highest light output level.
  • the invention allows taking this variability into account leading to the highest energy saving without visible effect.
  • the varying dim level is a monotonously decreasing dim level from the highest dim level downwards.
  • the selecting then comprises determining the maximum dim level from the monotonously decreasing dim level as the dim level used at a moment where the light output level drops below the first threshold light output level.
  • this value can be set as a reference. From this reference, the first threshold light output level can be directly obtained. This may for example be done by applying the above mentioned factor to the measured reference level. As the dim level decreases monotonously, the measured light output level will drop below the first threshold light output level and the corresponding dim level is then set as the maximum dim level. It is thus an advantage that the maximum dim level is obtained in straightforward manner.
  • a light output level of a light may become unstable upon dimming if the light output level no longer decreases monotonously with a monotonously decreasing dimming level.
  • a light will start flickering or may fluctuate in light output level.
  • the dimming level at which the light output level becomes unstable depends on the type of light used in combination with the dimmer. In the same way a maximum dim level is obtained, a minimum dim level is thus obtained thereby preventing a user to operate the dimmer below this minimum dim level. It is thus an advantage that a dimmer is prevented from being operated in a dimming range where the light output is unstable
  • the method further comprises the following steps:
  • a dimmer in combination with a certain light will exhibit a dimming profile, i.e. a relation between the input dim level applied to the dimmer and the actual light output level.
  • This dimming profile may depend on the actual settings inside the dimmer, the type of dimmer technology and the type of light.
  • This dimming profile may be different from the desired profile.
  • the desired profile may for example be according to an S-shaped or inverse S-shaped curve while the measured and thus obtained dimming profile differs from this desired profile.
  • An input dimming level received at the controller during operation will thus be corrected by the controller by looking up the corrected dimming level from the correction profile and steering the dimmer with this corrected dimming level.
  • the combination of the corrected profile and the dimming profile thereby results in the desired or preset dimming profile.
  • the correction profile may thus be obtained by the difference between the preset dimming profile and the obtained dimming profile.
  • a preset dimming profile may be obtained in an easy and straightforward manner for every dimmer-light combination.
  • a uniform dimming experience or feel is obtained during operation.
  • the invention relates to a portable device for calibrating a dimmer controller comprising:
  • Such a portable device may for example be a tablet, smartphone or portable computer comprising a separate photo sensor or a camera functioning or used as a photo sensor. It is an advantage that these devices are readily available on the market and may be easily configured to execute the above steps.
  • the processor may then be configured by a software application or app providing instructions to the processor to execute these steps.
  • the processor is further configured to also program the dimmer controller wirelessly over the wireless interface.
  • the invention relates to a computer program product comprising computer-executable instructions for performing the method according to the first aspect when the program is run on a computer.
  • the invention relates to a computer readable storage medium comprising the computer program product according to the third aspect.
  • the invention relates to a data processing system programmed for carrying out the method according to the first aspect.
  • Fig. 1 illustrates a portable device 1 that is held under a dimmable light 3 for calibrating a dimmer controller 2 according to an embodiment of the invention.
  • Some lights 3 in a building 8 are dimmable by respective dimmers 4 installed in an electrical cabinet 7.
  • Each dimmer 4 dims one or more lights by varying the power supplied to the lights 3.
  • Each dimmer is again controlled by the dimmer controller 2 which is preferable also installed in the electrical cabinet.
  • the communication between the dimmer and dimmer controller may be done according to available standards depending on the type of dimmer used.
  • the dimmers 4 are typically centralized in the electrical cabinet 7.
  • the dimmers may also be installed remotely, i.e., closer to the lights 3, for example together with the switch 6 that provides input to the dimmer controller 2. This is useful in renovations where existing traditional on-off lighting is replaced be dimmed lighting and where it is not possible to install separate wiring form the lights 3 to the electrical cabinet 7.
  • the control signals of the dimmer may then run over a separate signal wire or over the original electrical wires.
  • a remote dimmer may also operate wirelessly over a wireless connection between the dimmer 4 and the dimmer controller 2.
  • the dimmer controller 2 controls on one hand the dimmers 4 by sending a dim level command which specifies the dim level at which the respective dimmers 4 should operate and thus dim the lights 3.
  • the controller 2 receives input signals from various input devices.
  • One such an input device is for example a dim switch 6 for controlling one or more of the dimmers and thus the lights 3.
  • more sophisticated input devices may be provided that allow to set all sort of lighting schemes. The dimmer controller will then control one or more of the dimmers 4 with a preprogramed dim level according to the selected lighting scheme.
  • the dimmer controller 2 is remotely controllable and programmable over a wireless connection.
  • the controller 2 may comprise a wireless network interface or a wired network interface which is connected to a wireless access point.
  • a portable device 1 comprising a wireless network interface then communicates with the controller 2 in order to calibrate a combination of a dimmer 4 and a light 3. After this calibration, the new settings are saved and thus programmed in the controller 2.
  • the portable device 1 supplies a varying dim level to the dimmer 4 steering the light 3 under which the portable device 1 is positioned.
  • the varying dim level is thus supplied to the controller 2 which, on its turn, forwards the varying dim level to the selected dimmer.
  • Such a varying dim level 30 is illustrated in Fig. 2 .
  • the normalized value of the dim level 30 is represented on the Y-axis with circles as a function of time on the X-axis.
  • the dimmer 4 supplies the highest output power to the light 3 resulting in the highest normalized light output level 21 of the light of 100%.
  • the value of the light output level is represented by crosses.
  • the varying dim level is decreasing linearly from 100% towards 0%. It is preferred that the varying dim level 30 is monotonically decreasing.
  • the portable device measures the corresponding varying light output level 31 which is a result of the varying dim level 30.
  • the relation between the supplied dim level 30 and the measured light output level 31 will be non-linear.
  • the light output level 31 will drop below a predetermined light output level 24. In Fig. 2 this occurs between time step t5 and t6.
  • the portable device 1 selects the corresponding dim level where the varying light output level 31 crosses this predetermined light output level as the maximum dim level.
  • the maximum dim level may be approximated by the dim level at time step t5 or the dim level at time step t6. Alternatively, the maximum dim level may be determined by an interpolation of the dim levels at time step t5 and t6.
  • the portable device 1 programs the controller 2 to use the selected maximum dim level as the new highest dim level for controlling the respective dimmer 4. In other words, after the calibrating and thus during operation the controller 2 will no longer supply a dim level higher than this maximum dim level to the dimmer 4.
  • the purpose and advantage of this calibration is a reduction in used power when using a light at its highest output power.
  • the dim level is related to the electrical power provided to the dimmed light, the light will consume less power after the calibration when used at its highest light output level.
  • the predetermined light output level 24 or threshold light output level 24 is preferably chosen such that the light output level is not visibly different between the highest dim level and the selected maximum dim level, i.e., not observable by an average human eye.
  • the threshold light output level 24 is chosen to be equal to the measured highest light output level 21.
  • the corresponding dim level at that moment is selected as the maximum dim level. In the example of Fig. 2 this corresponds to the dim level at the time t4, t5 or an interpolated value of the dim level between t4 an t5.
  • the light output level observed by a human eye is not linear with the light output level of a light but shows a square law relationship. For example, if the light output level is at 90% of its highest output level, the perceived brightness will be at 95% of the brightness perceived at the highest output level. This effect is caused by the dilation of the pupil, also referred to as mydriasis, as a reaction to the decreased light output level. Due to this effect, a small reduction in light output level will also not be notified by a human eye. Therefore, according to an alternative embodiment, the threshold light output level 24 is determined as between 90% and 100% of the measured highest light output level.
  • the light output level may become unstable near the minimal dim levels, i.e., near the minimal light output level. Therefore, complementary to the above embodiment and as also illustrated in Fig. 2 , this may be avoided by selecting a minimum dim level corresponding to a minimum light output level 22 below which the light output level is unstable.
  • the dimmer controller 2 is then programmed to use this minimum dim level as new lower limit for controlling or steering the dimmer during operation, i.e., after the calibration.
  • the portable device 1 measures the light output level corresponding to the decreasing dim level until it is unstable.
  • the light output level is determined as unstable when it starts to flicker, i.e., when the device 1 measures different light output levels at the same dim level, or when the device 1 measures a higher light output level when the dim level was actually decreased. This latter effect is shown as an example in Fig. 2 at time step 14 and, hence, the minimum dim level is set as the dim level at time step t13.
  • the dimming profile of the dimmer is calibrated by the portable device 1.
  • An uncalibrated dimmer profile 20 is shown as an example in Fig. 3 .
  • Such a profile shows the relation between the dim level of the dimmer 4 and the light output power or level emitted by and measured from the light 3.
  • the light output power is shown as a percentage of the highest light output level 21 on the Y-axis and the dim level is shown as a percentage of the highest dim level 23 on the X-axis.
  • This dimming profile is obtained from the measurements as shown by Fig. 2 , i.e. by applying a varying dim level from 100% till 0% and measuring the corresponding light output level.
  • the maximum dim level 27 with the corresponding threshold light output level 24 and the minimum dim level 26 with corresponding minimum light output level 22 are shown as obtained by the above embodiments.
  • the dimming profile might still follow an undesirable curve. It might for example be desired that the dimming profile follows an S- or inverted S-curve or, more general, a target or preset dimming profile.
  • Such a target dimming profile 60 is shown in Fig. 5 where the light output level is shown on the Y-axis against the dim level of the controller on the X-axis.
  • the target dimming profile 60 is shown for the dim level of the controller, i.e. , the dim level requested internally in the controller or by an input device connected to the controller 2.
  • the controller 2 will then translate or correct a requested dim level to a dim level command for the actual dimmer.
  • a correction profile is derived from the measured dimming profile 20 and the target dimming profile 60.
  • An example of such a curve 40 is shown by Fig. 4 .
  • a requested dim level for the controller on the X-axis is to be corrected to a dim level command for the actual dimmer.
  • a 100% dim level for the controller will correspond to a maximum dim level 27 for the dimmer.
  • a 0% dim level for the controller will correspond to a minimum dim level 26 for the dimmer.
  • the portable device 1 After the portable device 1 has obtained the dimming profile 20 from the varying dim level and the corresponding measured varying light output level, it derives the correction profile 40 from the obtained dimming profile 20 and the preset or target dimming profile 60.
  • the correction profile then represents a correction to be applied to an input dim level received at the controller 2 in order to obtain a corrected dim level and thus dimming command for the dimmer.
  • the correction profile is then uploaded to the controller, preferably over the wireless interface, and programmed into the controller 2. From that moment on, i.e,. during operation, the dimming profile of the combination dimmer controller 2 - dimmer 4 and light 3 will be according to the preset or target dimmer profile 60.
  • a multitude of dimmer-light combinations may be calibrated according to the above embodiments. This may for example be performed by a technician before the first use of the electrical installation. Every time a dimmer-light combination is to be calibrated, the technician holds the portable device 1 under the respective light and initiates the device 1 to perform the calibrating steps according to the above embodiments. In the same way, also a recalibration may be performed; for example after the installation of a new light bulb or a new type of light bulb. Both during a calibration or a recalibration, the controller 2 should be put in a mode where no calibration settings are used, i.e. neither a maximum or minimum dim level or correction profile are used. In other words, during a calibration procedure, the dim level commands received by the controller should be forwarded unaltered to the respective dimmer.
  • the portable device 1 is equipped with a photo sensor 5 as illustrated by Fig. 5 .
  • a photo sensor is capable of measuring the light output level of a light, for example it may measure the luminous intensity of a light.
  • the portable device is a portable communication device such as for example a tablet computer, a smartphone or laptop computer.
  • the sending of the varying dim level and the programming of the controller 2 may be performed by a wireless network interface using for example a wireless LAN protocol or a cellular network protocol connecting directly or indirectly via an access point or base station to the dimmer controller 2.
  • the portable communication device is then equipped with a camera which is used as the photo sensor.
  • the steps used to perform the calibration according to the above embodiments may then be provided as a software application running on a processor comprised in this portable communication device 1.
  • top, bottom, over, under, and the like are introduced for descriptive purposes and not necessarily to denote relative positions. It is to be understood that the terms so used are interchangeable under appropriate circumstances and embodiments of the invention are capable of operating according to the present invention in other sequences, or in orientations different from the one(s) described or illustrated above.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP14155784.3A 2014-02-19 2014-02-19 Procédé et dispositif pour étalonner une commande de gradateur Active EP2911481B1 (fr)

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EP14155784.3A EP2911481B1 (fr) 2014-02-19 2014-02-19 Procédé et dispositif pour étalonner une commande de gradateur

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EP14155784.3A EP2911481B1 (fr) 2014-02-19 2014-02-19 Procédé et dispositif pour étalonner une commande de gradateur

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EP2911481A1 true EP2911481A1 (fr) 2015-08-26
EP2911481B1 EP2911481B1 (fr) 2018-07-11

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111629489A (zh) * 2020-06-05 2020-09-04 东莞华明灯具有限公司 一种自适应抗干扰的感应灯电路

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7190126B1 (en) * 2004-08-24 2007-03-13 Watt Stopper, Inc. Daylight control system device and method
US20130010018A1 (en) * 2011-06-30 2013-01-10 Lutron Electronics Co., Inc. Method Of Optically Transmitting Digital Information From A Smart Phone To A Control Device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7190126B1 (en) * 2004-08-24 2007-03-13 Watt Stopper, Inc. Daylight control system device and method
US20130010018A1 (en) * 2011-06-30 2013-01-10 Lutron Electronics Co., Inc. Method Of Optically Transmitting Digital Information From A Smart Phone To A Control Device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"ASSIST recommends... Dimming: A technology-neutral Definition", vol. 12, 2013, LIGHTING RESEARCH CENTER

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111629489A (zh) * 2020-06-05 2020-09-04 东莞华明灯具有限公司 一种自适应抗干扰的感应灯电路

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Publication number Publication date
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