WO2014083475A2 - Dispositif de pilotage pour piloter une charge et dispositif de connecteur pour fournir une puissance électrique à une pluralité d'éléments de charge - Google Patents

Dispositif de pilotage pour piloter une charge et dispositif de connecteur pour fournir une puissance électrique à une pluralité d'éléments de charge Download PDF

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Publication number
WO2014083475A2
WO2014083475A2 PCT/IB2013/060164 IB2013060164W WO2014083475A2 WO 2014083475 A2 WO2014083475 A2 WO 2014083475A2 IB 2013060164 W IB2013060164 W IB 2013060164W WO 2014083475 A2 WO2014083475 A2 WO 2014083475A2
Authority
WO
WIPO (PCT)
Prior art keywords
voltage
driver device
load
busbar
elements
Prior art date
Application number
PCT/IB2013/060164
Other languages
English (en)
Other versions
WO2014083475A3 (fr
Inventor
Hendrikus Hubertus Petrus Gommans
Fetze Pijlman
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 WO2014083475A2 publication Critical patent/WO2014083475A2/fr
Publication of WO2014083475A3 publication Critical patent/WO2014083475A3/fr

Links

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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V21/00—Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
    • F21V21/34—Supporting elements displaceable along a guiding element
    • F21V21/35—Supporting elements displaceable along a guiding element with direct electrical contact between the supporting element and electric conductors running along the guiding element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R25/00—Coupling parts adapted for simultaneous co-operation with two or more identical counterparts, e.g. for distributing energy to two or more circuits
    • H01R25/14—Rails or bus-bars constructed so that the counterparts can be connected thereto at any point along their length
    • H01R25/142—Their counterparts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R33/00—Coupling devices specially adapted for supporting apparatus and having one part acting as a holder providing support and electrical connection via a counterpart which is structurally associated with the apparatus, e.g. lamp holders; Separate parts thereof
    • H01R33/945—Holders with built-in electrical component

Definitions

  • Driver device for driving a load and connector device for providing electrical power to a plurality of load elements
  • the present invention relates to a driver device for driving a load. Further, the present invention relates to a connector device for providing electrical power to a plurality of load elements, in particular for powering a plurality of lighting devices.
  • Track lighting systems in general are systems comprising a rail system embedded in or suspended at a sealing, at which lighting devices such as LEDs, spotlights or bulbs can be mounted.
  • the rail systems can be of various lengths in a range of less than 1 meter up to tens of meters. Longer track systems usually consist of single modules each having a length of 1 to 5 meters.
  • the track lighting systems usually consist of multiple busbars inside an aluminum U-profile, wherein the busbars are connected either to a low voltage or a mains voltage power line for powering the connected lighting devices.
  • the mains voltage track system is preferred.
  • mains voltage supply is preferred, since smaller currents need to be provided via the busbars than in a low voltage system so that the losses for transporting the electrical power are minimized.
  • the connection of the track system to a low voltage supply and/or a voltage converter is required. Since the form factor of a voltage converter depends among other factors on the power to be delivered and on the difference between input and output voltage of the converter for converting the usual mains voltage of 230 V AC to e.g. 48 V DC requires a size of 120 cm 3 .
  • the voltage converter for providing the low DC voltage to the LED lighting device are usually connected to mains voltage and integrated in each of the LED lighting device.
  • the size and the design of the lighting devices is highly determined by the form factor of the converter and the driver device for driving the light emitting elements.
  • US 2005/0169015 Al an LED luminaire track lighting system is known having two busbar conductors for providing a single drive voltage to the connected lighting devices for powering the lighting devices.
  • the disadvantage of the system known from this document is that only a single voltage level is provided to the lighting devices so that either only a single kind of lighting devices can be used, which are powered with the same voltage level or that the lighting devices need additional driver devices which increase the size of the optical design and will increase the technical effort and the costs of the lighting devices.
  • a driver device for driving a load comprising:
  • a housing adapted to be mounted at a guide rail
  • a plurality of connector elements formed at the housing for electrically connecting the driver device to busbars of the guide rail, wherein a first and a second of the connection elements are provided for receiving an input voltage from an external voltage supply, and
  • a converter unit connected to the first and the second of the connection elements for receiving the input voltage and for converting the input voltage to an electric output variable provided to a third of the connection elements for powering the load connected to one of the busbars of the guide rail.
  • a connector device for providing electrical power to a plurality of load elements, in particular for powering a plurality of lighting devices comprising:
  • a guiding rail for mounting the load elements movable in a longitudinal direction
  • a second conductive busbar for connecting the load elements to a neutral potential
  • a third conductive busbar connected to a driver device for providing a drive voltage to the load elements
  • a connector device for providing electrical power to a plurality of load elements, in particular for powering a plurality of lighting devices comprising:
  • a guiding rail for mounting the load elements movable in a longitudinal direction, at least three conductive busbars isolated from each other and a driver device according to the present invention mounted at the guiding rail and electrically connected to the conductive busbars.
  • the present invention is based upon the idea to provide a driver device which is mountable at a guiding rail to which an external power supply is connected and to provide a drive voltage to separate busbars for driving the connected load elements.
  • the load elements and in particular the lighting devices connected to the guide rail can be powered by means of the driver device, which is easily connectable to the guide rail.
  • the present invention is further based on the idea to provide a connector device, in particular a track system having a guiding rail and a plurality of conductive busbars, wherein a first conductive busbar is connected to an external power supply and a second busbar is connected to a neutral potential and a third conductive busbar is connected to a driver device for providing a drive voltage via the third busbar to the connected load elements so that the load elements can be powered either by means of the external voltage or by means of the drive voltage so that load elements powered by means of different voltage levels can be used.
  • the present invention is further based on the idea to provide a connector device comprising a guiding rail for mounting load elements movable in a longitudinal direction and a driver device which is mountable at the guiding rail and electrically connected to the conductive busbars so that the driver device, which is mounted at the guiding rail can convert the input voltage provided via the busbars from the external voltage supply, in particular from mains, to the drive voltage which is provided to an additional of the busbars so that different voltage levels are provided to the load elements for powering different kinds of load elements.
  • the variability of the load elements, which can be powered by means of the driver device via the connector device is increased since different voltage level from the external power supply and from the driver device can be provided to the load elements.
  • the electrical output variable is a unipolar output voltage applied to the third of the connection elements. This is a simple solution to provide a drive voltage to the busbars for driving load elements connected to the busbars.
  • the electrical output variable is a direct current provided to the third connection element. This is a simple solution to provide a defined electrical power to the busbars independently of the amount of connected load elements.
  • the converter unit comprises a rectifier unit for rectifying the input voltage and a voltage converter for converting the rectified voltage to a unipolar output voltage.
  • a rectifier unit for rectifying the input voltage
  • a voltage converter for converting the rectified voltage to a unipolar output voltage.
  • the converter unit comprises a stepdown converter. This is a simple solution to reduce the voltage level provided to the third connection element for driving load elements with a drive voltage having a reduced voltage level.
  • the converter unit comprises a galvanic isolation device connected between the rectifier and the voltage converter.
  • the galvanic isolation provides a safe and isolated drive voltage independent from the input voltage at the first busbar so that the load elements can be driven independently by means of the input voltage or the drive voltage.
  • a current measurement unit is provided for measuring an electrical current in one of the busbars, wherein the converter unit is adapted to adapt the electrical output variable on the basis of the measured current. This is a possibility to keep the current in a respective busbar below a certain value to fulfill safety requirements and to avoid current peaks in the respective busbar. If the current in the respective busbar increases over a predefined level, the output voltage provided by the driver device is reduced in order to reduce the current in the busbar. Further, if a plurality of driver devices are connected to the respective busbar, the current in the busbar can be easily restricted to a predefined level.
  • the second of the connection elements is connected to an input terminal of the converter unit and connected to an output terminal of the converter unit for connecting the driver device to a neutral potential.
  • connection elements are formed at side surfaces of the housing and wherein the housing is adapted to be inserted into a guiding rail comprising busbars for connecting the connection elements to the load.
  • the driver device is connected to the first conductive busbar for receiving the input voltage from the external voltage supply. This is a simple solution to provide the input voltage to the driver device via the busbar of the connector device whereby the technical effort for powering the driver device is reduced.
  • the guiding rail has a U- shape wherein the conductive busbars are provided on the inside of the U-shaped guiding rail.
  • the second busbar is formed between the first and the third conductive busbar. This is a simple solution for connecting load elements either to the input voltage via the first and the second busbar or to the drive voltage via the second and the third busbar.
  • the first and the second conductive busbars are connected to connecting terminals for connecting the first and the second busbar to mains as the external power supply.
  • the conductor device can be used to supply mains voltage to the plurality of load elements and to power additional elements by means of the driver device, which is powered by means of the mains voltage.
  • the present invention is based on the idea to provide a first voltage level and a second voltage level to busbars of a guide rail for powering different load elements, in particular lighting elements such as LEDs.
  • the high voltage is converted to the drive voltage by means of a separate driver device, which can be connected to the guide rail and receives the input voltage from the busbar of the guide rail. Therefore, the size of the load elements can be reduced since the low voltage is provided by a separate driver device.
  • the connector device comprises three conductive busbars, a high voltage and a low voltage level can be provided to the load elements and, further, to the driver device such that the variability of the whole system is increased.
  • Fig. 1 shows a schematic perspective view of a track lighting system comprising a plurality of lighting elements
  • Fig. 2 shows a schematic view of a guide rail according to the present invention
  • Fig. 3 shows a schematic sectional view of a driver device to be inserted in the guiding rail according to the present invention
  • Fig. 4 shows a schematic sectional assembly drawing of the guiding rail and the integrated driver device according to the present invention
  • Fig. 5 shows a schematic block diagram of the driver device.
  • Fig. 1 shows a lighting track, which is generally denoted by 10.
  • the lighting track 10 comprises a housing 12 or a main body 12 including a guide rail 14, at which a plurality of lighting devices 16, 18, 20 are mounted.
  • the lighting devices 16, 18, 20 are mounted at the guiding rail 14 so as to be movable in a longitudinal direction of the main body 12.
  • the lighting track 10 comprises conductive busbars (not shown) for electrically connecting the lighting devices 16, 18, 20 to an electrical power source (not shown) for powering the lighting devices 16, 18, 20.
  • the busbars are disposed in the main body and extending along the longitudinal direction of the main body 12 so as to provide the electrical power to the lighting devices 16, 18, 20 at any longitudinal position.
  • the main body is preferably formed of aluminum.
  • the lighting devices 16, 18, 20 may be embedded in the main body 12 like the lighting devices 16, 18 or may extend from the main body 12 like the lighting device 20.
  • the lighting track 10 is provided to be embedded or suspended at a sealing, wherein various lighting devices and various numbers of the lighting devices 16, 18, 20 can be mounted at the main body 12 and connected to the busbars for various illumination.
  • Fig. 2 shows a schematic sectional view of the lighting track 10 according to the present invention.
  • the lighting track comprises the main body 12, which has a U- shape in the sectional view of Fig. 2.
  • the main body 12 comprises a slit-like opening 22 extending in the longitudinal direction of the main body 12 for inserting the lighting devices 16, 18, 20.
  • the slit-like opening 22 forms the guiding rail 14 for mounting the lighting devices 16, 18, 20 movable in the longitudinal direction of the main body 12.
  • busbars 24, 26, 28 are provided, which are separated and isolated from each other by means of isolation bars 30, 32, 34, 36.
  • the busbars 24, 26, 28 and the isolation bars 30, 32, 34, 36 are mounted on an inner side surface 38 of the main body 12.
  • the lighting track 10 shown in Fig. 2 has a symmetrical shape so that the busbars 24, 26, 28 and the isolation bars 30, 32, 34, 36 are provided at opposite inner side surfaces 38 of the main body 12.
  • the busbars 24, 26, 28 and the isolation bars 30 - 36 are only provided at one of the inner side surfaces 38.
  • first busbar 24 is provided only on one inner side surface 38 of the main body 12 and the second busbar 26 is only provided on the oppostie inner side surface 38 of the main body 12.
  • the busbars 24, 26, 28 are extending in the longitudinal direction of the main body 12 so that the lighting devices 16, 18, 20 can be electrically powered via the busbars 24, 26, 28 at any longitudinal position at the lighting track 10.
  • the busbars 24, 26, 28 are preferably copper bars.
  • the first busbar 24, which is located at or near the opening 20 is connected to an external power supply (not shown) which is preferably mains.
  • the first busbar 24 is connected to the phase connector of the mains.
  • the second busbar 26, which is provided at a middle position beside the first busbar 24 and isolated from the first busbar 24 by means of the isolation bar 32 is connected to a neutral potential or a ground potential so that a supply voltage or an input voltage between the first busbar 24 and the second busbar 26 can be provided to the lighting devices 16, 18, 20 connected to the lighting track 10.
  • a third busbar 28 is provided at the lowermost position within the main body 12 and isolated from the second busbar 26 by means of the isolation bar 34.
  • the third busbar 28 is connected to a driver device for providing a drive voltage via the third busbar 28 to the lighting devices 16, 18, 20 having a different voltage level than the input voltage provided via the first busbar 24.
  • the input voltage provided via the first busbar 24 is an alternating input voltage and preferably mains voltage of 230V AC and the drive voltage provided via the third busbar 28 is a direct voltage or a unipolar voltage having a voltage level lower than the input voltage, e.g. 24, 48 or 60V.
  • the second busbar 26 is connected to a neutral potential or ground level and serves as a common or a shared reference potential for the first busbar 24 and the third busbar 28.
  • the lighting devices 16, 18, 20 can be connected to the first and the second busbars 24, 26 or to the second and the third busbars 26, 28 dependent on which voltage level the respective lighting device 16, 18, 20 requires.
  • E.g. an LED unit without a separate voltage converter can be connected to the second and the third busbar and powered directly by means of the drive voltage provided to the third busbar 28.
  • Other lighting devices which have a separate voltage converter and/or which need to be powered by means of a higher voltage level or directly by mains voltage can be connected to the first and the second busbar 24, 26.
  • the length of the third basbar 28 is limited and corresponds preferably to the length of an existing guide rail 12.
  • the length of the third busbar 28 is preferably 2 m.
  • Fig. 3 shows a schematic diagram of a driver device generally denoted by 40.
  • the driver device 40 comprises a housing 42, wherein six electrical connector elements 44, 46, 48 are provided at the outside of the housing 42 and preferably at a surface of the housing 42.
  • the connector elements 44, 46, 48 are provided at opposite side surfaces 50 of the housing 42, wherein the side surfaces 50 comprise three protrusions 52 at which the connector elements 44, 46, 48 are disposed.
  • the outer shape of the housing 42 is adapted to the inner shape of the main body 12 of the lighting track 10 so that the driver device 40 can be inserted into the main body 12 for converting the mains voltage received from the first and the second busbar 24, 26 to the drive voltage provided to the second and the third busbar 26, 28.
  • a first of the connector elements 44 is provided to be connectable to the first busbar 24 and is connected to an electrical input terminal of the driver device 40 for providing the input voltage to the driver device 40.
  • the second of the connector elements 46 is adapted to be connectable to the second busbar 26 and forms a neutral or ground contact and forms a reference potential for the input terminal of the driver device 40.
  • the third of the connector elements 48 is formed to be connectable to the third of the busbars 28 and is connected to an electrical output terminal of the driver device 40.
  • the second connector element 46 is also connected to a second electrical input terminal of the driver device 40.
  • the driver device 40 is adapted to receive the input voltage via the first and the second connector element 44, 46 converts the input voltage to a unipolar or a direct voltage having a voltage level different from the voltage level of the input voltage and provides the such converted unipolar or direct voltage as the drive voltage to the output terminal and, therefore, to the second and the third connector element 46, 48.
  • the housing 42 of the driver device 40 has a symmetrical shape, wherein the connector elements 44, 46, 48 are provided at both opposite side surfaces 50 of the housing 42.
  • the connector elements 44, 46, 48 are only provided at one side surface 50 of the housing 42.
  • the first connector element 44 is only provided at one side surface 50 of the housing 42 and the second connector element 44 is only provided at the opposite side surface 50 of the housing 42 corresponding to the respective electrical power connection of the busbars 24, 26.
  • the protrusions 52 are formed to fit between the isolation bars 30, 32, 34, 36 so as to form a mechanical support of the driver device 40 within the main body 12 of the lighting track 10.
  • Fig. 4 shows a schematic sectional view of the lighting track 10 including the driver device 40.
  • the driver device 40 is inserted in the main body 12 of the lighting track 10 and mounted movable in a longitudinal direction of the lighting track 10.
  • the protrusions 52 are disposed between the isolation bars 30, 32, 34, 36 so as to support the housing 42 in the main body 12.
  • the connector elements 44, 46, 48 are formed as sliding contacts and are attached to the respective busbars 24, 26, 28 to form an electrical contact between the respective busbar 24, 26, 28 and the connector element 44, 46, 48.
  • the driver device 40 can receive the input voltage from the first and the second busbar 24, 26 and provide the drive voltage to the second and the third busbar 26, 28 for powering the respectively connected lighting devices 16, 18, 20.
  • Fig. 5 shows a schematic block diagram of the driver device 40.
  • the driver device 40 comprises a first input terminal 54 and a second input terminal 56.
  • the first input terminal 54 is connectable to an external voltage supply 58 for receiving the input voltage VI 0 from the external voltage supply 58.
  • the external voltage supply 58 is preferably mains and provides an alternating mains voltage of usually 230 V AC.
  • the driver device 40 comprises a first output terminal 60 and a second output terminal 62 for providing a drive voltage V20 and a drive current 120 for driving a load 64, which is in this case an LED unit 64.
  • the first input terminal 54 is preferably connected to the first connector element 44 to be connected to the first busbar 24.
  • the first output terminal 60 is preferably connected to the third connector element 48 to be connected to the third busbar 28.
  • the second input terminal 56 is connected to ground or a neutral potential and preferably connected via the second connector element 46 to the second busbar 26.
  • the second output terminal 62 is connected to a neutral potential and preferably connected via the second connector element 46 to the second busbar 26.
  • the driver device 40 comprises a rectifier unit 66, which is connected to the first input terminal 54 for rectifying the input voltage V10 to a rectified voltage V12.
  • the driver device 40 further comprises a galvanic isolation device 68 for providing a galvanic isolation between the input terminals 54, 56 and the output terminals 60, 62.
  • the second input terminal 56 is connected via a capacitor to the input of the galvanic isolation device 68 and the second output terminal 62 is connected via a capacitor to the output of the galvanic isolation device 68.
  • the driver device 40 further comprises a voltage converter 70 for converting the rectified voltage V12 to the output voltage V20.
  • the voltage converter 70 is a stepdown converter, a stepup converter or a buck-boost converter for converting the rectified voltage V12 to either a lower drive voltage V20 or a higher output voltage V20.
  • the drive voltage V20 and the drive current 120 is provided to the load element 64 for driving the load element 64.
  • the voltage converter 70 may comprise a current driver for providing a constant drive current 120 to the load 64 or to drive the drive current 120 depending on a measured value or an input value.
  • the output current 120 is set to a predefined value the electrical power provided to the load elements 16, 18, 20 and, therefore, the overall light emission is independent of the amount of attached lighting devices 16, 18, 20.
  • the current in the busbars 24, 26, 28 has to be kept below a certain value for safety reasons, e.g. 4A at 24V.
  • a current sensor can be integrated to measure the electrical current in the third busbar 28 and the voltage converter 70 can set the output voltage V20 and/or the output current 120 to a value such that the current in the third busbar 28 does not exceed a predefined level.
  • 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.
  • 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.

Landscapes

  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

La présente invention porte sur un dispositif de pilotage (40) pour piloter une charge (64), comprenant un boîtier (42) adapté pour être monté au niveau d'un rail de guide (14), une pluralité d'éléments de connecteur (44, 46, 48) formés au niveau d'une surface (50) du boîtier (42) pour connecter électriquement le dispositif de pilotage (40) à des barres omnibus (24, 26, 28) du rail de guide (14), un premier et un second élément de connexion parmi les éléments de connexion (44, 46) étant disposés pour recevoir une tension d'entrée (V10) provenant d'une alimentation de tension externe (58), et une unité de convertisseur connectée aux premier et second éléments de connexion parmi les éléments de connexion (44, 46) pour recevoir le tension d'entrée (V10) et pour convertir la tension d'entrée (V10) en une variable de sortie électrique (V20 ; I20) fournie à un troisième élément de connexion parmi les éléments de connexion (48) pour alimenter en puissance la charge (64) connectée aux barres omnibus (24, 26, 28) du rail de guide.
PCT/IB2013/060164 2012-11-30 2013-11-15 Dispositif de pilotage pour piloter une charge et dispositif de connecteur pour fournir une puissance électrique à une pluralité d'éléments de charge WO2014083475A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201261731882P 2012-11-30 2012-11-30
US61/731,882 2012-11-30

Publications (2)

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WO2014083475A2 true WO2014083475A2 (fr) 2014-06-05
WO2014083475A3 WO2014083475A3 (fr) 2014-11-06

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PCT/IB2013/060164 WO2014083475A2 (fr) 2012-11-30 2013-11-15 Dispositif de pilotage pour piloter une charge et dispositif de connecteur pour fournir une puissance électrique à une pluralité d'éléments de charge

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050169015A1 (en) 2003-09-18 2005-08-04 Luk John F. LED color changing luminaire and track light system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT391382B (de) * 1987-10-20 1990-09-25 Zumtobel Ag Adapter mit einem gehaeuse zum anschluss von lampen, insbesondere von gasentladungs- und niederspannungsgluehlampen
DE20304394U1 (de) * 2003-03-18 2004-07-29 Erco Leuchten Gmbh Stromschienen-Adapter
DE102005019632A1 (de) * 2005-04-26 2006-11-09 Erco Leuchten Gmbh Leuchte, Betriebsgerät, Stromschiene, Schaltungsanordnung und Stromschienen-Adapter
DE102011017702A1 (de) * 2011-04-28 2012-10-31 Zumtobel Lighting Gmbh Lichtbandsystem und Konvertereinheit hierfür

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050169015A1 (en) 2003-09-18 2005-08-04 Luk John F. LED color changing luminaire and track light system

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